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Merge branch 'fix/asoc' into for-linus
[net-next-2.6.git] / drivers / gpu / drm / i915 / i915_gem.c
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1/*
2 * Copyright © 2008 Intel Corporation
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21 * IN THE SOFTWARE.
22 *
23 * Authors:
24 * Eric Anholt <eric@anholt.net>
25 *
26 */
27
28#include "drmP.h"
29#include "drm.h"
30#include "i915_drm.h"
31#include "i915_drv.h"
32#include "i915_trace.h"
33#include "intel_drv.h"
34#include <linux/slab.h>
35#include <linux/swap.h>
36#include <linux/pci.h>
37#include <linux/intel-gtt.h>
38
39static uint32_t i915_gem_get_gtt_alignment(struct drm_gem_object *obj);
40static int i915_gem_object_flush_gpu_write_domain(struct drm_gem_object *obj);
41static void i915_gem_object_flush_gtt_write_domain(struct drm_gem_object *obj);
42static void i915_gem_object_flush_cpu_write_domain(struct drm_gem_object *obj);
43static int i915_gem_object_set_to_cpu_domain(struct drm_gem_object *obj,
44 int write);
45static int i915_gem_object_set_cpu_read_domain_range(struct drm_gem_object *obj,
46 uint64_t offset,
47 uint64_t size);
48static void i915_gem_object_set_to_full_cpu_read_domain(struct drm_gem_object *obj);
49static int i915_gem_object_wait_rendering(struct drm_gem_object *obj);
50static int i915_gem_object_bind_to_gtt(struct drm_gem_object *obj,
51 unsigned alignment);
52static void i915_gem_clear_fence_reg(struct drm_gem_object *obj);
53static int i915_gem_phys_pwrite(struct drm_device *dev, struct drm_gem_object *obj,
54 struct drm_i915_gem_pwrite *args,
55 struct drm_file *file_priv);
56static void i915_gem_free_object_tail(struct drm_gem_object *obj);
57
58static LIST_HEAD(shrink_list);
59static DEFINE_SPINLOCK(shrink_list_lock);
60
61static inline bool
62i915_gem_object_is_inactive(struct drm_i915_gem_object *obj_priv)
63{
64 return obj_priv->gtt_space &&
65 !obj_priv->active &&
66 obj_priv->pin_count == 0;
67}
68
69int i915_gem_do_init(struct drm_device *dev, unsigned long start,
70 unsigned long end)
71{
72 drm_i915_private_t *dev_priv = dev->dev_private;
73
74 if (start >= end ||
75 (start & (PAGE_SIZE - 1)) != 0 ||
76 (end & (PAGE_SIZE - 1)) != 0) {
77 return -EINVAL;
78 }
79
80 drm_mm_init(&dev_priv->mm.gtt_space, start,
81 end - start);
82
83 dev->gtt_total = (uint32_t) (end - start);
84
85 return 0;
86}
87
88int
89i915_gem_init_ioctl(struct drm_device *dev, void *data,
90 struct drm_file *file_priv)
91{
92 struct drm_i915_gem_init *args = data;
93 int ret;
94
95 mutex_lock(&dev->struct_mutex);
96 ret = i915_gem_do_init(dev, args->gtt_start, args->gtt_end);
97 mutex_unlock(&dev->struct_mutex);
98
99 return ret;
100}
101
102int
103i915_gem_get_aperture_ioctl(struct drm_device *dev, void *data,
104 struct drm_file *file_priv)
105{
106 struct drm_i915_gem_get_aperture *args = data;
107
108 if (!(dev->driver->driver_features & DRIVER_GEM))
109 return -ENODEV;
110
111 args->aper_size = dev->gtt_total;
112 args->aper_available_size = (args->aper_size -
113 atomic_read(&dev->pin_memory));
114
115 return 0;
116}
117
118
119/**
120 * Creates a new mm object and returns a handle to it.
121 */
122int
123i915_gem_create_ioctl(struct drm_device *dev, void *data,
124 struct drm_file *file_priv)
125{
126 struct drm_i915_gem_create *args = data;
127 struct drm_gem_object *obj;
128 int ret;
129 u32 handle;
130
131 args->size = roundup(args->size, PAGE_SIZE);
132
133 /* Allocate the new object */
134 obj = i915_gem_alloc_object(dev, args->size);
135 if (obj == NULL)
136 return -ENOMEM;
137
138 ret = drm_gem_handle_create(file_priv, obj, &handle);
139 /* drop reference from allocate - handle holds it now */
140 drm_gem_object_unreference_unlocked(obj);
141 if (ret) {
142 return ret;
143 }
144
145 args->handle = handle;
146 return 0;
147}
148
149static inline int
150fast_shmem_read(struct page **pages,
151 loff_t page_base, int page_offset,
152 char __user *data,
153 int length)
154{
155 char __iomem *vaddr;
156 int unwritten;
157
158 vaddr = kmap_atomic(pages[page_base >> PAGE_SHIFT], KM_USER0);
159 if (vaddr == NULL)
160 return -ENOMEM;
161 unwritten = __copy_to_user_inatomic(data, vaddr + page_offset, length);
162 kunmap_atomic(vaddr, KM_USER0);
163
164 if (unwritten)
165 return -EFAULT;
166
167 return 0;
168}
169
170static int i915_gem_object_needs_bit17_swizzle(struct drm_gem_object *obj)
171{
172 drm_i915_private_t *dev_priv = obj->dev->dev_private;
173 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
174
175 return dev_priv->mm.bit_6_swizzle_x == I915_BIT_6_SWIZZLE_9_10_17 &&
176 obj_priv->tiling_mode != I915_TILING_NONE;
177}
178
179static inline void
180slow_shmem_copy(struct page *dst_page,
181 int dst_offset,
182 struct page *src_page,
183 int src_offset,
184 int length)
185{
186 char *dst_vaddr, *src_vaddr;
187
188 dst_vaddr = kmap(dst_page);
189 src_vaddr = kmap(src_page);
190
191 memcpy(dst_vaddr + dst_offset, src_vaddr + src_offset, length);
192
193 kunmap(src_page);
194 kunmap(dst_page);
195}
196
197static inline void
198slow_shmem_bit17_copy(struct page *gpu_page,
199 int gpu_offset,
200 struct page *cpu_page,
201 int cpu_offset,
202 int length,
203 int is_read)
204{
205 char *gpu_vaddr, *cpu_vaddr;
206
207 /* Use the unswizzled path if this page isn't affected. */
208 if ((page_to_phys(gpu_page) & (1 << 17)) == 0) {
209 if (is_read)
210 return slow_shmem_copy(cpu_page, cpu_offset,
211 gpu_page, gpu_offset, length);
212 else
213 return slow_shmem_copy(gpu_page, gpu_offset,
214 cpu_page, cpu_offset, length);
215 }
216
217 gpu_vaddr = kmap(gpu_page);
218 cpu_vaddr = kmap(cpu_page);
219
220 /* Copy the data, XORing A6 with A17 (1). The user already knows he's
221 * XORing with the other bits (A9 for Y, A9 and A10 for X)
222 */
223 while (length > 0) {
224 int cacheline_end = ALIGN(gpu_offset + 1, 64);
225 int this_length = min(cacheline_end - gpu_offset, length);
226 int swizzled_gpu_offset = gpu_offset ^ 64;
227
228 if (is_read) {
229 memcpy(cpu_vaddr + cpu_offset,
230 gpu_vaddr + swizzled_gpu_offset,
231 this_length);
232 } else {
233 memcpy(gpu_vaddr + swizzled_gpu_offset,
234 cpu_vaddr + cpu_offset,
235 this_length);
236 }
237 cpu_offset += this_length;
238 gpu_offset += this_length;
239 length -= this_length;
240 }
241
242 kunmap(cpu_page);
243 kunmap(gpu_page);
244}
245
246/**
247 * This is the fast shmem pread path, which attempts to copy_from_user directly
248 * from the backing pages of the object to the user's address space. On a
249 * fault, it fails so we can fall back to i915_gem_shmem_pwrite_slow().
250 */
251static int
252i915_gem_shmem_pread_fast(struct drm_device *dev, struct drm_gem_object *obj,
253 struct drm_i915_gem_pread *args,
254 struct drm_file *file_priv)
255{
256 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
257 ssize_t remain;
258 loff_t offset, page_base;
259 char __user *user_data;
260 int page_offset, page_length;
261 int ret;
262
263 user_data = (char __user *) (uintptr_t) args->data_ptr;
264 remain = args->size;
265
266 mutex_lock(&dev->struct_mutex);
267
268 ret = i915_gem_object_get_pages(obj, 0);
269 if (ret != 0)
270 goto fail_unlock;
271
272 ret = i915_gem_object_set_cpu_read_domain_range(obj, args->offset,
273 args->size);
274 if (ret != 0)
275 goto fail_put_pages;
276
277 obj_priv = to_intel_bo(obj);
278 offset = args->offset;
279
280 while (remain > 0) {
281 /* Operation in this page
282 *
283 * page_base = page offset within aperture
284 * page_offset = offset within page
285 * page_length = bytes to copy for this page
286 */
287 page_base = (offset & ~(PAGE_SIZE-1));
288 page_offset = offset & (PAGE_SIZE-1);
289 page_length = remain;
290 if ((page_offset + remain) > PAGE_SIZE)
291 page_length = PAGE_SIZE - page_offset;
292
293 ret = fast_shmem_read(obj_priv->pages,
294 page_base, page_offset,
295 user_data, page_length);
296 if (ret)
297 goto fail_put_pages;
298
299 remain -= page_length;
300 user_data += page_length;
301 offset += page_length;
302 }
303
304fail_put_pages:
305 i915_gem_object_put_pages(obj);
306fail_unlock:
307 mutex_unlock(&dev->struct_mutex);
308
309 return ret;
310}
311
312static int
313i915_gem_object_get_pages_or_evict(struct drm_gem_object *obj)
314{
315 int ret;
316
317 ret = i915_gem_object_get_pages(obj, __GFP_NORETRY | __GFP_NOWARN);
318
319 /* If we've insufficient memory to map in the pages, attempt
320 * to make some space by throwing out some old buffers.
321 */
322 if (ret == -ENOMEM) {
323 struct drm_device *dev = obj->dev;
324
325 ret = i915_gem_evict_something(dev, obj->size,
326 i915_gem_get_gtt_alignment(obj));
327 if (ret)
328 return ret;
329
330 ret = i915_gem_object_get_pages(obj, 0);
331 }
332
333 return ret;
334}
335
336/**
337 * This is the fallback shmem pread path, which allocates temporary storage
338 * in kernel space to copy_to_user into outside of the struct_mutex, so we
339 * can copy out of the object's backing pages while holding the struct mutex
340 * and not take page faults.
341 */
342static int
343i915_gem_shmem_pread_slow(struct drm_device *dev, struct drm_gem_object *obj,
344 struct drm_i915_gem_pread *args,
345 struct drm_file *file_priv)
346{
347 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
348 struct mm_struct *mm = current->mm;
349 struct page **user_pages;
350 ssize_t remain;
351 loff_t offset, pinned_pages, i;
352 loff_t first_data_page, last_data_page, num_pages;
353 int shmem_page_index, shmem_page_offset;
354 int data_page_index, data_page_offset;
355 int page_length;
356 int ret;
357 uint64_t data_ptr = args->data_ptr;
358 int do_bit17_swizzling;
359
360 remain = args->size;
361
362 /* Pin the user pages containing the data. We can't fault while
363 * holding the struct mutex, yet we want to hold it while
364 * dereferencing the user data.
365 */
366 first_data_page = data_ptr / PAGE_SIZE;
367 last_data_page = (data_ptr + args->size - 1) / PAGE_SIZE;
368 num_pages = last_data_page - first_data_page + 1;
369
370 user_pages = drm_calloc_large(num_pages, sizeof(struct page *));
371 if (user_pages == NULL)
372 return -ENOMEM;
373
374 down_read(&mm->mmap_sem);
375 pinned_pages = get_user_pages(current, mm, (uintptr_t)args->data_ptr,
376 num_pages, 1, 0, user_pages, NULL);
377 up_read(&mm->mmap_sem);
378 if (pinned_pages < num_pages) {
379 ret = -EFAULT;
380 goto fail_put_user_pages;
381 }
382
383 do_bit17_swizzling = i915_gem_object_needs_bit17_swizzle(obj);
384
385 mutex_lock(&dev->struct_mutex);
386
387 ret = i915_gem_object_get_pages_or_evict(obj);
388 if (ret)
389 goto fail_unlock;
390
391 ret = i915_gem_object_set_cpu_read_domain_range(obj, args->offset,
392 args->size);
393 if (ret != 0)
394 goto fail_put_pages;
395
396 obj_priv = to_intel_bo(obj);
397 offset = args->offset;
398
399 while (remain > 0) {
400 /* Operation in this page
401 *
402 * shmem_page_index = page number within shmem file
403 * shmem_page_offset = offset within page in shmem file
404 * data_page_index = page number in get_user_pages return
405 * data_page_offset = offset with data_page_index page.
406 * page_length = bytes to copy for this page
407 */
408 shmem_page_index = offset / PAGE_SIZE;
409 shmem_page_offset = offset & ~PAGE_MASK;
410 data_page_index = data_ptr / PAGE_SIZE - first_data_page;
411 data_page_offset = data_ptr & ~PAGE_MASK;
412
413 page_length = remain;
414 if ((shmem_page_offset + page_length) > PAGE_SIZE)
415 page_length = PAGE_SIZE - shmem_page_offset;
416 if ((data_page_offset + page_length) > PAGE_SIZE)
417 page_length = PAGE_SIZE - data_page_offset;
418
419 if (do_bit17_swizzling) {
420 slow_shmem_bit17_copy(obj_priv->pages[shmem_page_index],
421 shmem_page_offset,
422 user_pages[data_page_index],
423 data_page_offset,
424 page_length,
425 1);
426 } else {
427 slow_shmem_copy(user_pages[data_page_index],
428 data_page_offset,
429 obj_priv->pages[shmem_page_index],
430 shmem_page_offset,
431 page_length);
432 }
433
434 remain -= page_length;
435 data_ptr += page_length;
436 offset += page_length;
437 }
438
439fail_put_pages:
440 i915_gem_object_put_pages(obj);
441fail_unlock:
442 mutex_unlock(&dev->struct_mutex);
443fail_put_user_pages:
444 for (i = 0; i < pinned_pages; i++) {
445 SetPageDirty(user_pages[i]);
446 page_cache_release(user_pages[i]);
447 }
448 drm_free_large(user_pages);
449
450 return ret;
451}
452
453/**
454 * Reads data from the object referenced by handle.
455 *
456 * On error, the contents of *data are undefined.
457 */
458int
459i915_gem_pread_ioctl(struct drm_device *dev, void *data,
460 struct drm_file *file_priv)
461{
462 struct drm_i915_gem_pread *args = data;
463 struct drm_gem_object *obj;
464 struct drm_i915_gem_object *obj_priv;
465 int ret;
466
467 obj = drm_gem_object_lookup(dev, file_priv, args->handle);
468 if (obj == NULL)
469 return -ENOENT;
470 obj_priv = to_intel_bo(obj);
471
472 /* Bounds check source. */
473 if (args->offset > obj->size || args->size > obj->size - args->offset) {
474 ret = -EINVAL;
475 goto err;
476 }
477
478 if (!access_ok(VERIFY_WRITE,
479 (char __user *)(uintptr_t)args->data_ptr,
480 args->size)) {
481 ret = -EFAULT;
482 goto err;
483 }
484
485 if (i915_gem_object_needs_bit17_swizzle(obj)) {
486 ret = i915_gem_shmem_pread_slow(dev, obj, args, file_priv);
487 } else {
488 ret = i915_gem_shmem_pread_fast(dev, obj, args, file_priv);
489 if (ret != 0)
490 ret = i915_gem_shmem_pread_slow(dev, obj, args,
491 file_priv);
492 }
493
494err:
495 drm_gem_object_unreference_unlocked(obj);
496 return ret;
497}
498
499/* This is the fast write path which cannot handle
500 * page faults in the source data
501 */
502
503static inline int
504fast_user_write(struct io_mapping *mapping,
505 loff_t page_base, int page_offset,
506 char __user *user_data,
507 int length)
508{
509 char *vaddr_atomic;
510 unsigned long unwritten;
511
512 vaddr_atomic = io_mapping_map_atomic_wc(mapping, page_base, KM_USER0);
513 unwritten = __copy_from_user_inatomic_nocache(vaddr_atomic + page_offset,
514 user_data, length);
515 io_mapping_unmap_atomic(vaddr_atomic, KM_USER0);
516 if (unwritten)
517 return -EFAULT;
518 return 0;
519}
520
521/* Here's the write path which can sleep for
522 * page faults
523 */
524
525static inline void
526slow_kernel_write(struct io_mapping *mapping,
527 loff_t gtt_base, int gtt_offset,
528 struct page *user_page, int user_offset,
529 int length)
530{
531 char __iomem *dst_vaddr;
532 char *src_vaddr;
533
534 dst_vaddr = io_mapping_map_wc(mapping, gtt_base);
535 src_vaddr = kmap(user_page);
536
537 memcpy_toio(dst_vaddr + gtt_offset,
538 src_vaddr + user_offset,
539 length);
540
541 kunmap(user_page);
542 io_mapping_unmap(dst_vaddr);
543}
544
545static inline int
546fast_shmem_write(struct page **pages,
547 loff_t page_base, int page_offset,
548 char __user *data,
549 int length)
550{
551 char __iomem *vaddr;
552 unsigned long unwritten;
553
554 vaddr = kmap_atomic(pages[page_base >> PAGE_SHIFT], KM_USER0);
555 if (vaddr == NULL)
556 return -ENOMEM;
557 unwritten = __copy_from_user_inatomic(vaddr + page_offset, data, length);
558 kunmap_atomic(vaddr, KM_USER0);
559
560 if (unwritten)
561 return -EFAULT;
562 return 0;
563}
564
565/**
566 * This is the fast pwrite path, where we copy the data directly from the
567 * user into the GTT, uncached.
568 */
569static int
570i915_gem_gtt_pwrite_fast(struct drm_device *dev, struct drm_gem_object *obj,
571 struct drm_i915_gem_pwrite *args,
572 struct drm_file *file_priv)
573{
574 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
575 drm_i915_private_t *dev_priv = dev->dev_private;
576 ssize_t remain;
577 loff_t offset, page_base;
578 char __user *user_data;
579 int page_offset, page_length;
580 int ret;
581
582 user_data = (char __user *) (uintptr_t) args->data_ptr;
583 remain = args->size;
584
585
586 mutex_lock(&dev->struct_mutex);
587 ret = i915_gem_object_pin(obj, 0);
588 if (ret) {
589 mutex_unlock(&dev->struct_mutex);
590 return ret;
591 }
592 ret = i915_gem_object_set_to_gtt_domain(obj, 1);
593 if (ret)
594 goto fail;
595
596 obj_priv = to_intel_bo(obj);
597 offset = obj_priv->gtt_offset + args->offset;
598
599 while (remain > 0) {
600 /* Operation in this page
601 *
602 * page_base = page offset within aperture
603 * page_offset = offset within page
604 * page_length = bytes to copy for this page
605 */
606 page_base = (offset & ~(PAGE_SIZE-1));
607 page_offset = offset & (PAGE_SIZE-1);
608 page_length = remain;
609 if ((page_offset + remain) > PAGE_SIZE)
610 page_length = PAGE_SIZE - page_offset;
611
612 ret = fast_user_write (dev_priv->mm.gtt_mapping, page_base,
613 page_offset, user_data, page_length);
614
615 /* If we get a fault while copying data, then (presumably) our
616 * source page isn't available. Return the error and we'll
617 * retry in the slow path.
618 */
619 if (ret)
620 goto fail;
621
622 remain -= page_length;
623 user_data += page_length;
624 offset += page_length;
625 }
626
627fail:
628 i915_gem_object_unpin(obj);
629 mutex_unlock(&dev->struct_mutex);
630
631 return ret;
632}
633
634/**
635 * This is the fallback GTT pwrite path, which uses get_user_pages to pin
636 * the memory and maps it using kmap_atomic for copying.
637 *
638 * This code resulted in x11perf -rgb10text consuming about 10% more CPU
639 * than using i915_gem_gtt_pwrite_fast on a G45 (32-bit).
640 */
641static int
642i915_gem_gtt_pwrite_slow(struct drm_device *dev, struct drm_gem_object *obj,
643 struct drm_i915_gem_pwrite *args,
644 struct drm_file *file_priv)
645{
646 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
647 drm_i915_private_t *dev_priv = dev->dev_private;
648 ssize_t remain;
649 loff_t gtt_page_base, offset;
650 loff_t first_data_page, last_data_page, num_pages;
651 loff_t pinned_pages, i;
652 struct page **user_pages;
653 struct mm_struct *mm = current->mm;
654 int gtt_page_offset, data_page_offset, data_page_index, page_length;
655 int ret;
656 uint64_t data_ptr = args->data_ptr;
657
658 remain = args->size;
659
660 /* Pin the user pages containing the data. We can't fault while
661 * holding the struct mutex, and all of the pwrite implementations
662 * want to hold it while dereferencing the user data.
663 */
664 first_data_page = data_ptr / PAGE_SIZE;
665 last_data_page = (data_ptr + args->size - 1) / PAGE_SIZE;
666 num_pages = last_data_page - first_data_page + 1;
667
668 user_pages = drm_calloc_large(num_pages, sizeof(struct page *));
669 if (user_pages == NULL)
670 return -ENOMEM;
671
672 down_read(&mm->mmap_sem);
673 pinned_pages = get_user_pages(current, mm, (uintptr_t)args->data_ptr,
674 num_pages, 0, 0, user_pages, NULL);
675 up_read(&mm->mmap_sem);
676 if (pinned_pages < num_pages) {
677 ret = -EFAULT;
678 goto out_unpin_pages;
679 }
680
681 mutex_lock(&dev->struct_mutex);
682 ret = i915_gem_object_pin(obj, 0);
683 if (ret)
684 goto out_unlock;
685
686 ret = i915_gem_object_set_to_gtt_domain(obj, 1);
687 if (ret)
688 goto out_unpin_object;
689
690 obj_priv = to_intel_bo(obj);
691 offset = obj_priv->gtt_offset + args->offset;
692
693 while (remain > 0) {
694 /* Operation in this page
695 *
696 * gtt_page_base = page offset within aperture
697 * gtt_page_offset = offset within page in aperture
698 * data_page_index = page number in get_user_pages return
699 * data_page_offset = offset with data_page_index page.
700 * page_length = bytes to copy for this page
701 */
702 gtt_page_base = offset & PAGE_MASK;
703 gtt_page_offset = offset & ~PAGE_MASK;
704 data_page_index = data_ptr / PAGE_SIZE - first_data_page;
705 data_page_offset = data_ptr & ~PAGE_MASK;
706
707 page_length = remain;
708 if ((gtt_page_offset + page_length) > PAGE_SIZE)
709 page_length = PAGE_SIZE - gtt_page_offset;
710 if ((data_page_offset + page_length) > PAGE_SIZE)
711 page_length = PAGE_SIZE - data_page_offset;
712
713 slow_kernel_write(dev_priv->mm.gtt_mapping,
714 gtt_page_base, gtt_page_offset,
715 user_pages[data_page_index],
716 data_page_offset,
717 page_length);
718
719 remain -= page_length;
720 offset += page_length;
721 data_ptr += page_length;
722 }
723
724out_unpin_object:
725 i915_gem_object_unpin(obj);
726out_unlock:
727 mutex_unlock(&dev->struct_mutex);
728out_unpin_pages:
729 for (i = 0; i < pinned_pages; i++)
730 page_cache_release(user_pages[i]);
731 drm_free_large(user_pages);
732
733 return ret;
734}
735
736/**
737 * This is the fast shmem pwrite path, which attempts to directly
738 * copy_from_user into the kmapped pages backing the object.
739 */
740static int
741i915_gem_shmem_pwrite_fast(struct drm_device *dev, struct drm_gem_object *obj,
742 struct drm_i915_gem_pwrite *args,
743 struct drm_file *file_priv)
744{
745 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
746 ssize_t remain;
747 loff_t offset, page_base;
748 char __user *user_data;
749 int page_offset, page_length;
750 int ret;
751
752 user_data = (char __user *) (uintptr_t) args->data_ptr;
753 remain = args->size;
754
755 mutex_lock(&dev->struct_mutex);
756
757 ret = i915_gem_object_get_pages(obj, 0);
758 if (ret != 0)
759 goto fail_unlock;
760
761 ret = i915_gem_object_set_to_cpu_domain(obj, 1);
762 if (ret != 0)
763 goto fail_put_pages;
764
765 obj_priv = to_intel_bo(obj);
766 offset = args->offset;
767 obj_priv->dirty = 1;
768
769 while (remain > 0) {
770 /* Operation in this page
771 *
772 * page_base = page offset within aperture
773 * page_offset = offset within page
774 * page_length = bytes to copy for this page
775 */
776 page_base = (offset & ~(PAGE_SIZE-1));
777 page_offset = offset & (PAGE_SIZE-1);
778 page_length = remain;
779 if ((page_offset + remain) > PAGE_SIZE)
780 page_length = PAGE_SIZE - page_offset;
781
782 ret = fast_shmem_write(obj_priv->pages,
783 page_base, page_offset,
784 user_data, page_length);
785 if (ret)
786 goto fail_put_pages;
787
788 remain -= page_length;
789 user_data += page_length;
790 offset += page_length;
791 }
792
793fail_put_pages:
794 i915_gem_object_put_pages(obj);
795fail_unlock:
796 mutex_unlock(&dev->struct_mutex);
797
798 return ret;
799}
800
801/**
802 * This is the fallback shmem pwrite path, which uses get_user_pages to pin
803 * the memory and maps it using kmap_atomic for copying.
804 *
805 * This avoids taking mmap_sem for faulting on the user's address while the
806 * struct_mutex is held.
807 */
808static int
809i915_gem_shmem_pwrite_slow(struct drm_device *dev, struct drm_gem_object *obj,
810 struct drm_i915_gem_pwrite *args,
811 struct drm_file *file_priv)
812{
813 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
814 struct mm_struct *mm = current->mm;
815 struct page **user_pages;
816 ssize_t remain;
817 loff_t offset, pinned_pages, i;
818 loff_t first_data_page, last_data_page, num_pages;
819 int shmem_page_index, shmem_page_offset;
820 int data_page_index, data_page_offset;
821 int page_length;
822 int ret;
823 uint64_t data_ptr = args->data_ptr;
824 int do_bit17_swizzling;
825
826 remain = args->size;
827
828 /* Pin the user pages containing the data. We can't fault while
829 * holding the struct mutex, and all of the pwrite implementations
830 * want to hold it while dereferencing the user data.
831 */
832 first_data_page = data_ptr / PAGE_SIZE;
833 last_data_page = (data_ptr + args->size - 1) / PAGE_SIZE;
834 num_pages = last_data_page - first_data_page + 1;
835
836 user_pages = drm_calloc_large(num_pages, sizeof(struct page *));
837 if (user_pages == NULL)
838 return -ENOMEM;
839
840 down_read(&mm->mmap_sem);
841 pinned_pages = get_user_pages(current, mm, (uintptr_t)args->data_ptr,
842 num_pages, 0, 0, user_pages, NULL);
843 up_read(&mm->mmap_sem);
844 if (pinned_pages < num_pages) {
845 ret = -EFAULT;
846 goto fail_put_user_pages;
847 }
848
849 do_bit17_swizzling = i915_gem_object_needs_bit17_swizzle(obj);
850
851 mutex_lock(&dev->struct_mutex);
852
853 ret = i915_gem_object_get_pages_or_evict(obj);
854 if (ret)
855 goto fail_unlock;
856
857 ret = i915_gem_object_set_to_cpu_domain(obj, 1);
858 if (ret != 0)
859 goto fail_put_pages;
860
861 obj_priv = to_intel_bo(obj);
862 offset = args->offset;
863 obj_priv->dirty = 1;
864
865 while (remain > 0) {
866 /* Operation in this page
867 *
868 * shmem_page_index = page number within shmem file
869 * shmem_page_offset = offset within page in shmem file
870 * data_page_index = page number in get_user_pages return
871 * data_page_offset = offset with data_page_index page.
872 * page_length = bytes to copy for this page
873 */
874 shmem_page_index = offset / PAGE_SIZE;
875 shmem_page_offset = offset & ~PAGE_MASK;
876 data_page_index = data_ptr / PAGE_SIZE - first_data_page;
877 data_page_offset = data_ptr & ~PAGE_MASK;
878
879 page_length = remain;
880 if ((shmem_page_offset + page_length) > PAGE_SIZE)
881 page_length = PAGE_SIZE - shmem_page_offset;
882 if ((data_page_offset + page_length) > PAGE_SIZE)
883 page_length = PAGE_SIZE - data_page_offset;
884
885 if (do_bit17_swizzling) {
886 slow_shmem_bit17_copy(obj_priv->pages[shmem_page_index],
887 shmem_page_offset,
888 user_pages[data_page_index],
889 data_page_offset,
890 page_length,
891 0);
892 } else {
893 slow_shmem_copy(obj_priv->pages[shmem_page_index],
894 shmem_page_offset,
895 user_pages[data_page_index],
896 data_page_offset,
897 page_length);
898 }
899
900 remain -= page_length;
901 data_ptr += page_length;
902 offset += page_length;
903 }
904
905fail_put_pages:
906 i915_gem_object_put_pages(obj);
907fail_unlock:
908 mutex_unlock(&dev->struct_mutex);
909fail_put_user_pages:
910 for (i = 0; i < pinned_pages; i++)
911 page_cache_release(user_pages[i]);
912 drm_free_large(user_pages);
913
914 return ret;
915}
916
917/**
918 * Writes data to the object referenced by handle.
919 *
920 * On error, the contents of the buffer that were to be modified are undefined.
921 */
922int
923i915_gem_pwrite_ioctl(struct drm_device *dev, void *data,
924 struct drm_file *file_priv)
925{
926 struct drm_i915_gem_pwrite *args = data;
927 struct drm_gem_object *obj;
928 struct drm_i915_gem_object *obj_priv;
929 int ret = 0;
930
931 obj = drm_gem_object_lookup(dev, file_priv, args->handle);
932 if (obj == NULL)
933 return -ENOENT;
934 obj_priv = to_intel_bo(obj);
935
936 /* Bounds check destination. */
937 if (args->offset > obj->size || args->size > obj->size - args->offset) {
938 ret = -EINVAL;
939 goto err;
940 }
941
942 if (!access_ok(VERIFY_READ,
943 (char __user *)(uintptr_t)args->data_ptr,
944 args->size)) {
945 ret = -EFAULT;
946 goto err;
947 }
948
949 /* We can only do the GTT pwrite on untiled buffers, as otherwise
950 * it would end up going through the fenced access, and we'll get
951 * different detiling behavior between reading and writing.
952 * pread/pwrite currently are reading and writing from the CPU
953 * perspective, requiring manual detiling by the client.
954 */
955 if (obj_priv->phys_obj)
956 ret = i915_gem_phys_pwrite(dev, obj, args, file_priv);
957 else if (obj_priv->tiling_mode == I915_TILING_NONE &&
958 dev->gtt_total != 0 &&
959 obj->write_domain != I915_GEM_DOMAIN_CPU) {
960 ret = i915_gem_gtt_pwrite_fast(dev, obj, args, file_priv);
961 if (ret == -EFAULT) {
962 ret = i915_gem_gtt_pwrite_slow(dev, obj, args,
963 file_priv);
964 }
965 } else if (i915_gem_object_needs_bit17_swizzle(obj)) {
966 ret = i915_gem_shmem_pwrite_slow(dev, obj, args, file_priv);
967 } else {
968 ret = i915_gem_shmem_pwrite_fast(dev, obj, args, file_priv);
969 if (ret == -EFAULT) {
970 ret = i915_gem_shmem_pwrite_slow(dev, obj, args,
971 file_priv);
972 }
973 }
974
975#if WATCH_PWRITE
976 if (ret)
977 DRM_INFO("pwrite failed %d\n", ret);
978#endif
979
980err:
981 drm_gem_object_unreference_unlocked(obj);
982 return ret;
983}
984
985/**
986 * Called when user space prepares to use an object with the CPU, either
987 * through the mmap ioctl's mapping or a GTT mapping.
988 */
989int
990i915_gem_set_domain_ioctl(struct drm_device *dev, void *data,
991 struct drm_file *file_priv)
992{
993 struct drm_i915_private *dev_priv = dev->dev_private;
994 struct drm_i915_gem_set_domain *args = data;
995 struct drm_gem_object *obj;
996 struct drm_i915_gem_object *obj_priv;
997 uint32_t read_domains = args->read_domains;
998 uint32_t write_domain = args->write_domain;
999 int ret;
1000
1001 if (!(dev->driver->driver_features & DRIVER_GEM))
1002 return -ENODEV;
1003
1004 /* Only handle setting domains to types used by the CPU. */
1005 if (write_domain & I915_GEM_GPU_DOMAINS)
1006 return -EINVAL;
1007
1008 if (read_domains & I915_GEM_GPU_DOMAINS)
1009 return -EINVAL;
1010
1011 /* Having something in the write domain implies it's in the read
1012 * domain, and only that read domain. Enforce that in the request.
1013 */
1014 if (write_domain != 0 && read_domains != write_domain)
1015 return -EINVAL;
1016
1017 obj = drm_gem_object_lookup(dev, file_priv, args->handle);
1018 if (obj == NULL)
1019 return -ENOENT;
1020 obj_priv = to_intel_bo(obj);
1021
1022 mutex_lock(&dev->struct_mutex);
1023
1024 intel_mark_busy(dev, obj);
1025
1026#if WATCH_BUF
1027 DRM_INFO("set_domain_ioctl %p(%zd), %08x %08x\n",
1028 obj, obj->size, read_domains, write_domain);
1029#endif
1030 if (read_domains & I915_GEM_DOMAIN_GTT) {
1031 ret = i915_gem_object_set_to_gtt_domain(obj, write_domain != 0);
1032
1033 /* Update the LRU on the fence for the CPU access that's
1034 * about to occur.
1035 */
1036 if (obj_priv->fence_reg != I915_FENCE_REG_NONE) {
1037 struct drm_i915_fence_reg *reg =
1038 &dev_priv->fence_regs[obj_priv->fence_reg];
1039 list_move_tail(&reg->lru_list,
1040 &dev_priv->mm.fence_list);
1041 }
1042
1043 /* Silently promote "you're not bound, there was nothing to do"
1044 * to success, since the client was just asking us to
1045 * make sure everything was done.
1046 */
1047 if (ret == -EINVAL)
1048 ret = 0;
1049 } else {
1050 ret = i915_gem_object_set_to_cpu_domain(obj, write_domain != 0);
1051 }
1052
1053
1054 /* Maintain LRU order of "inactive" objects */
1055 if (ret == 0 && i915_gem_object_is_inactive(obj_priv))
1056 list_move_tail(&obj_priv->list, &dev_priv->mm.inactive_list);
1057
1058 drm_gem_object_unreference(obj);
1059 mutex_unlock(&dev->struct_mutex);
1060 return ret;
1061}
1062
1063/**
1064 * Called when user space has done writes to this buffer
1065 */
1066int
1067i915_gem_sw_finish_ioctl(struct drm_device *dev, void *data,
1068 struct drm_file *file_priv)
1069{
1070 struct drm_i915_gem_sw_finish *args = data;
1071 struct drm_gem_object *obj;
1072 struct drm_i915_gem_object *obj_priv;
1073 int ret = 0;
1074
1075 if (!(dev->driver->driver_features & DRIVER_GEM))
1076 return -ENODEV;
1077
1078 mutex_lock(&dev->struct_mutex);
1079 obj = drm_gem_object_lookup(dev, file_priv, args->handle);
1080 if (obj == NULL) {
1081 mutex_unlock(&dev->struct_mutex);
1082 return -ENOENT;
1083 }
1084
1085#if WATCH_BUF
1086 DRM_INFO("%s: sw_finish %d (%p %zd)\n",
1087 __func__, args->handle, obj, obj->size);
1088#endif
1089 obj_priv = to_intel_bo(obj);
1090
1091 /* Pinned buffers may be scanout, so flush the cache */
1092 if (obj_priv->pin_count)
1093 i915_gem_object_flush_cpu_write_domain(obj);
1094
1095 drm_gem_object_unreference(obj);
1096 mutex_unlock(&dev->struct_mutex);
1097 return ret;
1098}
1099
1100/**
1101 * Maps the contents of an object, returning the address it is mapped
1102 * into.
1103 *
1104 * While the mapping holds a reference on the contents of the object, it doesn't
1105 * imply a ref on the object itself.
1106 */
1107int
1108i915_gem_mmap_ioctl(struct drm_device *dev, void *data,
1109 struct drm_file *file_priv)
1110{
1111 struct drm_i915_gem_mmap *args = data;
1112 struct drm_gem_object *obj;
1113 loff_t offset;
1114 unsigned long addr;
1115
1116 if (!(dev->driver->driver_features & DRIVER_GEM))
1117 return -ENODEV;
1118
1119 obj = drm_gem_object_lookup(dev, file_priv, args->handle);
1120 if (obj == NULL)
1121 return -ENOENT;
1122
1123 offset = args->offset;
1124
1125 down_write(&current->mm->mmap_sem);
1126 addr = do_mmap(obj->filp, 0, args->size,
1127 PROT_READ | PROT_WRITE, MAP_SHARED,
1128 args->offset);
1129 up_write(&current->mm->mmap_sem);
1130 drm_gem_object_unreference_unlocked(obj);
1131 if (IS_ERR((void *)addr))
1132 return addr;
1133
1134 args->addr_ptr = (uint64_t) addr;
1135
1136 return 0;
1137}
1138
1139/**
1140 * i915_gem_fault - fault a page into the GTT
1141 * vma: VMA in question
1142 * vmf: fault info
1143 *
1144 * The fault handler is set up by drm_gem_mmap() when a object is GTT mapped
1145 * from userspace. The fault handler takes care of binding the object to
1146 * the GTT (if needed), allocating and programming a fence register (again,
1147 * only if needed based on whether the old reg is still valid or the object
1148 * is tiled) and inserting a new PTE into the faulting process.
1149 *
1150 * Note that the faulting process may involve evicting existing objects
1151 * from the GTT and/or fence registers to make room. So performance may
1152 * suffer if the GTT working set is large or there are few fence registers
1153 * left.
1154 */
1155int i915_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1156{
1157 struct drm_gem_object *obj = vma->vm_private_data;
1158 struct drm_device *dev = obj->dev;
1159 drm_i915_private_t *dev_priv = dev->dev_private;
1160 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
1161 pgoff_t page_offset;
1162 unsigned long pfn;
1163 int ret = 0;
1164 bool write = !!(vmf->flags & FAULT_FLAG_WRITE);
1165
1166 /* We don't use vmf->pgoff since that has the fake offset */
1167 page_offset = ((unsigned long)vmf->virtual_address - vma->vm_start) >>
1168 PAGE_SHIFT;
1169
1170 /* Now bind it into the GTT if needed */
1171 mutex_lock(&dev->struct_mutex);
1172 if (!obj_priv->gtt_space) {
1173 ret = i915_gem_object_bind_to_gtt(obj, 0);
1174 if (ret)
1175 goto unlock;
1176
1177 ret = i915_gem_object_set_to_gtt_domain(obj, write);
1178 if (ret)
1179 goto unlock;
1180 }
1181
1182 /* Need a new fence register? */
1183 if (obj_priv->tiling_mode != I915_TILING_NONE) {
1184 ret = i915_gem_object_get_fence_reg(obj);
1185 if (ret)
1186 goto unlock;
1187 }
1188
1189 if (i915_gem_object_is_inactive(obj_priv))
1190 list_move_tail(&obj_priv->list, &dev_priv->mm.inactive_list);
1191
1192 pfn = ((dev->agp->base + obj_priv->gtt_offset) >> PAGE_SHIFT) +
1193 page_offset;
1194
1195 /* Finally, remap it using the new GTT offset */
1196 ret = vm_insert_pfn(vma, (unsigned long)vmf->virtual_address, pfn);
1197unlock:
1198 mutex_unlock(&dev->struct_mutex);
1199
1200 switch (ret) {
1201 case 0:
1202 case -ERESTARTSYS:
1203 return VM_FAULT_NOPAGE;
1204 case -ENOMEM:
1205 case -EAGAIN:
1206 return VM_FAULT_OOM;
1207 default:
1208 return VM_FAULT_SIGBUS;
1209 }
1210}
1211
1212/**
1213 * i915_gem_create_mmap_offset - create a fake mmap offset for an object
1214 * @obj: obj in question
1215 *
1216 * GEM memory mapping works by handing back to userspace a fake mmap offset
1217 * it can use in a subsequent mmap(2) call. The DRM core code then looks
1218 * up the object based on the offset and sets up the various memory mapping
1219 * structures.
1220 *
1221 * This routine allocates and attaches a fake offset for @obj.
1222 */
1223static int
1224i915_gem_create_mmap_offset(struct drm_gem_object *obj)
1225{
1226 struct drm_device *dev = obj->dev;
1227 struct drm_gem_mm *mm = dev->mm_private;
1228 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
1229 struct drm_map_list *list;
1230 struct drm_local_map *map;
1231 int ret = 0;
1232
1233 /* Set the object up for mmap'ing */
1234 list = &obj->map_list;
1235 list->map = kzalloc(sizeof(struct drm_map_list), GFP_KERNEL);
1236 if (!list->map)
1237 return -ENOMEM;
1238
1239 map = list->map;
1240 map->type = _DRM_GEM;
1241 map->size = obj->size;
1242 map->handle = obj;
1243
1244 /* Get a DRM GEM mmap offset allocated... */
1245 list->file_offset_node = drm_mm_search_free(&mm->offset_manager,
1246 obj->size / PAGE_SIZE, 0, 0);
1247 if (!list->file_offset_node) {
1248 DRM_ERROR("failed to allocate offset for bo %d\n", obj->name);
1249 ret = -ENOMEM;
1250 goto out_free_list;
1251 }
1252
1253 list->file_offset_node = drm_mm_get_block(list->file_offset_node,
1254 obj->size / PAGE_SIZE, 0);
1255 if (!list->file_offset_node) {
1256 ret = -ENOMEM;
1257 goto out_free_list;
1258 }
1259
1260 list->hash.key = list->file_offset_node->start;
1261 if (drm_ht_insert_item(&mm->offset_hash, &list->hash)) {
1262 DRM_ERROR("failed to add to map hash\n");
1263 ret = -ENOMEM;
1264 goto out_free_mm;
1265 }
1266
1267 /* By now we should be all set, any drm_mmap request on the offset
1268 * below will get to our mmap & fault handler */
1269 obj_priv->mmap_offset = ((uint64_t) list->hash.key) << PAGE_SHIFT;
1270
1271 return 0;
1272
1273out_free_mm:
1274 drm_mm_put_block(list->file_offset_node);
1275out_free_list:
1276 kfree(list->map);
1277
1278 return ret;
1279}
1280
1281/**
1282 * i915_gem_release_mmap - remove physical page mappings
1283 * @obj: obj in question
1284 *
1285 * Preserve the reservation of the mmapping with the DRM core code, but
1286 * relinquish ownership of the pages back to the system.
1287 *
1288 * It is vital that we remove the page mapping if we have mapped a tiled
1289 * object through the GTT and then lose the fence register due to
1290 * resource pressure. Similarly if the object has been moved out of the
1291 * aperture, than pages mapped into userspace must be revoked. Removing the
1292 * mapping will then trigger a page fault on the next user access, allowing
1293 * fixup by i915_gem_fault().
1294 */
1295void
1296i915_gem_release_mmap(struct drm_gem_object *obj)
1297{
1298 struct drm_device *dev = obj->dev;
1299 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
1300
1301 if (dev->dev_mapping)
1302 unmap_mapping_range(dev->dev_mapping,
1303 obj_priv->mmap_offset, obj->size, 1);
1304}
1305
1306static void
1307i915_gem_free_mmap_offset(struct drm_gem_object *obj)
1308{
1309 struct drm_device *dev = obj->dev;
1310 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
1311 struct drm_gem_mm *mm = dev->mm_private;
1312 struct drm_map_list *list;
1313
1314 list = &obj->map_list;
1315 drm_ht_remove_item(&mm->offset_hash, &list->hash);
1316
1317 if (list->file_offset_node) {
1318 drm_mm_put_block(list->file_offset_node);
1319 list->file_offset_node = NULL;
1320 }
1321
1322 if (list->map) {
1323 kfree(list->map);
1324 list->map = NULL;
1325 }
1326
1327 obj_priv->mmap_offset = 0;
1328}
1329
1330/**
1331 * i915_gem_get_gtt_alignment - return required GTT alignment for an object
1332 * @obj: object to check
1333 *
1334 * Return the required GTT alignment for an object, taking into account
1335 * potential fence register mapping if needed.
1336 */
1337static uint32_t
1338i915_gem_get_gtt_alignment(struct drm_gem_object *obj)
1339{
1340 struct drm_device *dev = obj->dev;
1341 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
1342 int start, i;
1343
1344 /*
1345 * Minimum alignment is 4k (GTT page size), but might be greater
1346 * if a fence register is needed for the object.
1347 */
1348 if (IS_I965G(dev) || obj_priv->tiling_mode == I915_TILING_NONE)
1349 return 4096;
1350
1351 /*
1352 * Previous chips need to be aligned to the size of the smallest
1353 * fence register that can contain the object.
1354 */
1355 if (IS_I9XX(dev))
1356 start = 1024*1024;
1357 else
1358 start = 512*1024;
1359
1360 for (i = start; i < obj->size; i <<= 1)
1361 ;
1362
1363 return i;
1364}
1365
1366/**
1367 * i915_gem_mmap_gtt_ioctl - prepare an object for GTT mmap'ing
1368 * @dev: DRM device
1369 * @data: GTT mapping ioctl data
1370 * @file_priv: GEM object info
1371 *
1372 * Simply returns the fake offset to userspace so it can mmap it.
1373 * The mmap call will end up in drm_gem_mmap(), which will set things
1374 * up so we can get faults in the handler above.
1375 *
1376 * The fault handler will take care of binding the object into the GTT
1377 * (since it may have been evicted to make room for something), allocating
1378 * a fence register, and mapping the appropriate aperture address into
1379 * userspace.
1380 */
1381int
1382i915_gem_mmap_gtt_ioctl(struct drm_device *dev, void *data,
1383 struct drm_file *file_priv)
1384{
1385 struct drm_i915_gem_mmap_gtt *args = data;
1386 struct drm_gem_object *obj;
1387 struct drm_i915_gem_object *obj_priv;
1388 int ret;
1389
1390 if (!(dev->driver->driver_features & DRIVER_GEM))
1391 return -ENODEV;
1392
1393 obj = drm_gem_object_lookup(dev, file_priv, args->handle);
1394 if (obj == NULL)
1395 return -ENOENT;
1396
1397 mutex_lock(&dev->struct_mutex);
1398
1399 obj_priv = to_intel_bo(obj);
1400
1401 if (obj_priv->madv != I915_MADV_WILLNEED) {
1402 DRM_ERROR("Attempting to mmap a purgeable buffer\n");
1403 drm_gem_object_unreference(obj);
1404 mutex_unlock(&dev->struct_mutex);
1405 return -EINVAL;
1406 }
1407
1408
1409 if (!obj_priv->mmap_offset) {
1410 ret = i915_gem_create_mmap_offset(obj);
1411 if (ret) {
1412 drm_gem_object_unreference(obj);
1413 mutex_unlock(&dev->struct_mutex);
1414 return ret;
1415 }
1416 }
1417
1418 args->offset = obj_priv->mmap_offset;
1419
1420 /*
1421 * Pull it into the GTT so that we have a page list (makes the
1422 * initial fault faster and any subsequent flushing possible).
1423 */
1424 if (!obj_priv->agp_mem) {
1425 ret = i915_gem_object_bind_to_gtt(obj, 0);
1426 if (ret) {
1427 drm_gem_object_unreference(obj);
1428 mutex_unlock(&dev->struct_mutex);
1429 return ret;
1430 }
1431 }
1432
1433 drm_gem_object_unreference(obj);
1434 mutex_unlock(&dev->struct_mutex);
1435
1436 return 0;
1437}
1438
1439void
1440i915_gem_object_put_pages(struct drm_gem_object *obj)
1441{
1442 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
1443 int page_count = obj->size / PAGE_SIZE;
1444 int i;
1445
1446 BUG_ON(obj_priv->pages_refcount == 0);
1447 BUG_ON(obj_priv->madv == __I915_MADV_PURGED);
1448
1449 if (--obj_priv->pages_refcount != 0)
1450 return;
1451
1452 if (obj_priv->tiling_mode != I915_TILING_NONE)
1453 i915_gem_object_save_bit_17_swizzle(obj);
1454
1455 if (obj_priv->madv == I915_MADV_DONTNEED)
1456 obj_priv->dirty = 0;
1457
1458 for (i = 0; i < page_count; i++) {
1459 if (obj_priv->dirty)
1460 set_page_dirty(obj_priv->pages[i]);
1461
1462 if (obj_priv->madv == I915_MADV_WILLNEED)
1463 mark_page_accessed(obj_priv->pages[i]);
1464
1465 page_cache_release(obj_priv->pages[i]);
1466 }
1467 obj_priv->dirty = 0;
1468
1469 drm_free_large(obj_priv->pages);
1470 obj_priv->pages = NULL;
1471}
1472
1473static void
1474i915_gem_object_move_to_active(struct drm_gem_object *obj, uint32_t seqno,
1475 struct intel_ring_buffer *ring)
1476{
1477 struct drm_device *dev = obj->dev;
1478 drm_i915_private_t *dev_priv = dev->dev_private;
1479 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
1480 BUG_ON(ring == NULL);
1481 obj_priv->ring = ring;
1482
1483 /* Add a reference if we're newly entering the active list. */
1484 if (!obj_priv->active) {
1485 drm_gem_object_reference(obj);
1486 obj_priv->active = 1;
1487 }
1488 /* Move from whatever list we were on to the tail of execution. */
1489 spin_lock(&dev_priv->mm.active_list_lock);
1490 list_move_tail(&obj_priv->list, &ring->active_list);
1491 spin_unlock(&dev_priv->mm.active_list_lock);
1492 obj_priv->last_rendering_seqno = seqno;
1493}
1494
1495static void
1496i915_gem_object_move_to_flushing(struct drm_gem_object *obj)
1497{
1498 struct drm_device *dev = obj->dev;
1499 drm_i915_private_t *dev_priv = dev->dev_private;
1500 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
1501
1502 BUG_ON(!obj_priv->active);
1503 list_move_tail(&obj_priv->list, &dev_priv->mm.flushing_list);
1504 obj_priv->last_rendering_seqno = 0;
1505}
1506
1507/* Immediately discard the backing storage */
1508static void
1509i915_gem_object_truncate(struct drm_gem_object *obj)
1510{
1511 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
1512 struct inode *inode;
1513
1514 /* Our goal here is to return as much of the memory as
1515 * is possible back to the system as we are called from OOM.
1516 * To do this we must instruct the shmfs to drop all of its
1517 * backing pages, *now*. Here we mirror the actions taken
1518 * when by shmem_delete_inode() to release the backing store.
1519 */
1520 inode = obj->filp->f_path.dentry->d_inode;
1521 truncate_inode_pages(inode->i_mapping, 0);
1522 if (inode->i_op->truncate_range)
1523 inode->i_op->truncate_range(inode, 0, (loff_t)-1);
1524
1525 obj_priv->madv = __I915_MADV_PURGED;
1526}
1527
1528static inline int
1529i915_gem_object_is_purgeable(struct drm_i915_gem_object *obj_priv)
1530{
1531 return obj_priv->madv == I915_MADV_DONTNEED;
1532}
1533
1534static void
1535i915_gem_object_move_to_inactive(struct drm_gem_object *obj)
1536{
1537 struct drm_device *dev = obj->dev;
1538 drm_i915_private_t *dev_priv = dev->dev_private;
1539 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
1540
1541 i915_verify_inactive(dev, __FILE__, __LINE__);
1542 if (obj_priv->pin_count != 0)
1543 list_del_init(&obj_priv->list);
1544 else
1545 list_move_tail(&obj_priv->list, &dev_priv->mm.inactive_list);
1546
1547 BUG_ON(!list_empty(&obj_priv->gpu_write_list));
1548
1549 obj_priv->last_rendering_seqno = 0;
1550 obj_priv->ring = NULL;
1551 if (obj_priv->active) {
1552 obj_priv->active = 0;
1553 drm_gem_object_unreference(obj);
1554 }
1555 i915_verify_inactive(dev, __FILE__, __LINE__);
1556}
1557
1558static void
1559i915_gem_process_flushing_list(struct drm_device *dev,
1560 uint32_t flush_domains, uint32_t seqno,
1561 struct intel_ring_buffer *ring)
1562{
1563 drm_i915_private_t *dev_priv = dev->dev_private;
1564 struct drm_i915_gem_object *obj_priv, *next;
1565
1566 list_for_each_entry_safe(obj_priv, next,
1567 &dev_priv->mm.gpu_write_list,
1568 gpu_write_list) {
1569 struct drm_gem_object *obj = &obj_priv->base;
1570
1571 if ((obj->write_domain & flush_domains) ==
1572 obj->write_domain &&
1573 obj_priv->ring->ring_flag == ring->ring_flag) {
1574 uint32_t old_write_domain = obj->write_domain;
1575
1576 obj->write_domain = 0;
1577 list_del_init(&obj_priv->gpu_write_list);
1578 i915_gem_object_move_to_active(obj, seqno, ring);
1579
1580 /* update the fence lru list */
1581 if (obj_priv->fence_reg != I915_FENCE_REG_NONE) {
1582 struct drm_i915_fence_reg *reg =
1583 &dev_priv->fence_regs[obj_priv->fence_reg];
1584 list_move_tail(&reg->lru_list,
1585 &dev_priv->mm.fence_list);
1586 }
1587
1588 trace_i915_gem_object_change_domain(obj,
1589 obj->read_domains,
1590 old_write_domain);
1591 }
1592 }
1593}
1594
1595uint32_t
1596i915_add_request(struct drm_device *dev, struct drm_file *file_priv,
1597 uint32_t flush_domains, struct intel_ring_buffer *ring)
1598{
1599 drm_i915_private_t *dev_priv = dev->dev_private;
1600 struct drm_i915_file_private *i915_file_priv = NULL;
1601 struct drm_i915_gem_request *request;
1602 uint32_t seqno;
1603 int was_empty;
1604
1605 if (file_priv != NULL)
1606 i915_file_priv = file_priv->driver_priv;
1607
1608 request = kzalloc(sizeof(*request), GFP_KERNEL);
1609 if (request == NULL)
1610 return 0;
1611
1612 seqno = ring->add_request(dev, ring, file_priv, flush_domains);
1613
1614 request->seqno = seqno;
1615 request->ring = ring;
1616 request->emitted_jiffies = jiffies;
1617 was_empty = list_empty(&ring->request_list);
1618 list_add_tail(&request->list, &ring->request_list);
1619
1620 if (i915_file_priv) {
1621 list_add_tail(&request->client_list,
1622 &i915_file_priv->mm.request_list);
1623 } else {
1624 INIT_LIST_HEAD(&request->client_list);
1625 }
1626
1627 /* Associate any objects on the flushing list matching the write
1628 * domain we're flushing with our flush.
1629 */
1630 if (flush_domains != 0)
1631 i915_gem_process_flushing_list(dev, flush_domains, seqno, ring);
1632
1633 if (!dev_priv->mm.suspended) {
1634 mod_timer(&dev_priv->hangcheck_timer, jiffies + DRM_I915_HANGCHECK_PERIOD);
1635 if (was_empty)
1636 queue_delayed_work(dev_priv->wq, &dev_priv->mm.retire_work, HZ);
1637 }
1638 return seqno;
1639}
1640
1641/**
1642 * Command execution barrier
1643 *
1644 * Ensures that all commands in the ring are finished
1645 * before signalling the CPU
1646 */
1647static uint32_t
1648i915_retire_commands(struct drm_device *dev, struct intel_ring_buffer *ring)
1649{
1650 uint32_t flush_domains = 0;
1651
1652 /* The sampler always gets flushed on i965 (sigh) */
1653 if (IS_I965G(dev))
1654 flush_domains |= I915_GEM_DOMAIN_SAMPLER;
1655
1656 ring->flush(dev, ring,
1657 I915_GEM_DOMAIN_COMMAND, flush_domains);
1658 return flush_domains;
1659}
1660
1661/**
1662 * Moves buffers associated only with the given active seqno from the active
1663 * to inactive list, potentially freeing them.
1664 */
1665static void
1666i915_gem_retire_request(struct drm_device *dev,
1667 struct drm_i915_gem_request *request)
1668{
1669 drm_i915_private_t *dev_priv = dev->dev_private;
1670
1671 trace_i915_gem_request_retire(dev, request->seqno);
1672
1673 /* Move any buffers on the active list that are no longer referenced
1674 * by the ringbuffer to the flushing/inactive lists as appropriate.
1675 */
1676 spin_lock(&dev_priv->mm.active_list_lock);
1677 while (!list_empty(&request->ring->active_list)) {
1678 struct drm_gem_object *obj;
1679 struct drm_i915_gem_object *obj_priv;
1680
1681 obj_priv = list_first_entry(&request->ring->active_list,
1682 struct drm_i915_gem_object,
1683 list);
1684 obj = &obj_priv->base;
1685
1686 /* If the seqno being retired doesn't match the oldest in the
1687 * list, then the oldest in the list must still be newer than
1688 * this seqno.
1689 */
1690 if (obj_priv->last_rendering_seqno != request->seqno)
1691 goto out;
1692
1693#if WATCH_LRU
1694 DRM_INFO("%s: retire %d moves to inactive list %p\n",
1695 __func__, request->seqno, obj);
1696#endif
1697
1698 if (obj->write_domain != 0)
1699 i915_gem_object_move_to_flushing(obj);
1700 else {
1701 /* Take a reference on the object so it won't be
1702 * freed while the spinlock is held. The list
1703 * protection for this spinlock is safe when breaking
1704 * the lock like this since the next thing we do
1705 * is just get the head of the list again.
1706 */
1707 drm_gem_object_reference(obj);
1708 i915_gem_object_move_to_inactive(obj);
1709 spin_unlock(&dev_priv->mm.active_list_lock);
1710 drm_gem_object_unreference(obj);
1711 spin_lock(&dev_priv->mm.active_list_lock);
1712 }
1713 }
1714out:
1715 spin_unlock(&dev_priv->mm.active_list_lock);
1716}
1717
1718/**
1719 * Returns true if seq1 is later than seq2.
1720 */
1721bool
1722i915_seqno_passed(uint32_t seq1, uint32_t seq2)
1723{
1724 return (int32_t)(seq1 - seq2) >= 0;
1725}
1726
1727uint32_t
1728i915_get_gem_seqno(struct drm_device *dev,
1729 struct intel_ring_buffer *ring)
1730{
1731 return ring->get_gem_seqno(dev, ring);
1732}
1733
1734/**
1735 * This function clears the request list as sequence numbers are passed.
1736 */
1737static void
1738i915_gem_retire_requests_ring(struct drm_device *dev,
1739 struct intel_ring_buffer *ring)
1740{
1741 drm_i915_private_t *dev_priv = dev->dev_private;
1742 uint32_t seqno;
1743
1744 if (!ring->status_page.page_addr
1745 || list_empty(&ring->request_list))
1746 return;
1747
1748 seqno = i915_get_gem_seqno(dev, ring);
1749
1750 while (!list_empty(&ring->request_list)) {
1751 struct drm_i915_gem_request *request;
1752 uint32_t retiring_seqno;
1753
1754 request = list_first_entry(&ring->request_list,
1755 struct drm_i915_gem_request,
1756 list);
1757 retiring_seqno = request->seqno;
1758
1759 if (i915_seqno_passed(seqno, retiring_seqno) ||
1760 atomic_read(&dev_priv->mm.wedged)) {
1761 i915_gem_retire_request(dev, request);
1762
1763 list_del(&request->list);
1764 list_del(&request->client_list);
1765 kfree(request);
1766 } else
1767 break;
1768 }
1769
1770 if (unlikely (dev_priv->trace_irq_seqno &&
1771 i915_seqno_passed(dev_priv->trace_irq_seqno, seqno))) {
1772
1773 ring->user_irq_put(dev, ring);
1774 dev_priv->trace_irq_seqno = 0;
1775 }
1776}
1777
1778void
1779i915_gem_retire_requests(struct drm_device *dev)
1780{
1781 drm_i915_private_t *dev_priv = dev->dev_private;
1782
1783 if (!list_empty(&dev_priv->mm.deferred_free_list)) {
1784 struct drm_i915_gem_object *obj_priv, *tmp;
1785
1786 /* We must be careful that during unbind() we do not
1787 * accidentally infinitely recurse into retire requests.
1788 * Currently:
1789 * retire -> free -> unbind -> wait -> retire_ring
1790 */
1791 list_for_each_entry_safe(obj_priv, tmp,
1792 &dev_priv->mm.deferred_free_list,
1793 list)
1794 i915_gem_free_object_tail(&obj_priv->base);
1795 }
1796
1797 i915_gem_retire_requests_ring(dev, &dev_priv->render_ring);
1798 if (HAS_BSD(dev))
1799 i915_gem_retire_requests_ring(dev, &dev_priv->bsd_ring);
1800}
1801
1802void
1803i915_gem_retire_work_handler(struct work_struct *work)
1804{
1805 drm_i915_private_t *dev_priv;
1806 struct drm_device *dev;
1807
1808 dev_priv = container_of(work, drm_i915_private_t,
1809 mm.retire_work.work);
1810 dev = dev_priv->dev;
1811
1812 mutex_lock(&dev->struct_mutex);
1813 i915_gem_retire_requests(dev);
1814
1815 if (!dev_priv->mm.suspended &&
1816 (!list_empty(&dev_priv->render_ring.request_list) ||
1817 (HAS_BSD(dev) &&
1818 !list_empty(&dev_priv->bsd_ring.request_list))))
1819 queue_delayed_work(dev_priv->wq, &dev_priv->mm.retire_work, HZ);
1820 mutex_unlock(&dev->struct_mutex);
1821}
1822
1823int
1824i915_do_wait_request(struct drm_device *dev, uint32_t seqno,
1825 int interruptible, struct intel_ring_buffer *ring)
1826{
1827 drm_i915_private_t *dev_priv = dev->dev_private;
1828 u32 ier;
1829 int ret = 0;
1830
1831 BUG_ON(seqno == 0);
1832
1833 if (atomic_read(&dev_priv->mm.wedged))
1834 return -EIO;
1835
1836 if (!i915_seqno_passed(ring->get_gem_seqno(dev, ring), seqno)) {
1837 if (HAS_PCH_SPLIT(dev))
1838 ier = I915_READ(DEIER) | I915_READ(GTIER);
1839 else
1840 ier = I915_READ(IER);
1841 if (!ier) {
1842 DRM_ERROR("something (likely vbetool) disabled "
1843 "interrupts, re-enabling\n");
1844 i915_driver_irq_preinstall(dev);
1845 i915_driver_irq_postinstall(dev);
1846 }
1847
1848 trace_i915_gem_request_wait_begin(dev, seqno);
1849
1850 ring->waiting_gem_seqno = seqno;
1851 ring->user_irq_get(dev, ring);
1852 if (interruptible)
1853 ret = wait_event_interruptible(ring->irq_queue,
1854 i915_seqno_passed(
1855 ring->get_gem_seqno(dev, ring), seqno)
1856 || atomic_read(&dev_priv->mm.wedged));
1857 else
1858 wait_event(ring->irq_queue,
1859 i915_seqno_passed(
1860 ring->get_gem_seqno(dev, ring), seqno)
1861 || atomic_read(&dev_priv->mm.wedged));
1862
1863 ring->user_irq_put(dev, ring);
1864 ring->waiting_gem_seqno = 0;
1865
1866 trace_i915_gem_request_wait_end(dev, seqno);
1867 }
1868 if (atomic_read(&dev_priv->mm.wedged))
1869 ret = -EIO;
1870
1871 if (ret && ret != -ERESTARTSYS)
1872 DRM_ERROR("%s returns %d (awaiting %d at %d)\n",
1873 __func__, ret, seqno, ring->get_gem_seqno(dev, ring));
1874
1875 /* Directly dispatch request retiring. While we have the work queue
1876 * to handle this, the waiter on a request often wants an associated
1877 * buffer to have made it to the inactive list, and we would need
1878 * a separate wait queue to handle that.
1879 */
1880 if (ret == 0)
1881 i915_gem_retire_requests_ring(dev, ring);
1882
1883 return ret;
1884}
1885
1886/**
1887 * Waits for a sequence number to be signaled, and cleans up the
1888 * request and object lists appropriately for that event.
1889 */
1890static int
1891i915_wait_request(struct drm_device *dev, uint32_t seqno,
1892 struct intel_ring_buffer *ring)
1893{
1894 return i915_do_wait_request(dev, seqno, 1, ring);
1895}
1896
1897static void
1898i915_gem_flush(struct drm_device *dev,
1899 uint32_t invalidate_domains,
1900 uint32_t flush_domains)
1901{
1902 drm_i915_private_t *dev_priv = dev->dev_private;
1903 if (flush_domains & I915_GEM_DOMAIN_CPU)
1904 drm_agp_chipset_flush(dev);
1905 dev_priv->render_ring.flush(dev, &dev_priv->render_ring,
1906 invalidate_domains,
1907 flush_domains);
1908
1909 if (HAS_BSD(dev))
1910 dev_priv->bsd_ring.flush(dev, &dev_priv->bsd_ring,
1911 invalidate_domains,
1912 flush_domains);
1913}
1914
1915/**
1916 * Ensures that all rendering to the object has completed and the object is
1917 * safe to unbind from the GTT or access from the CPU.
1918 */
1919static int
1920i915_gem_object_wait_rendering(struct drm_gem_object *obj)
1921{
1922 struct drm_device *dev = obj->dev;
1923 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
1924 int ret;
1925
1926 /* This function only exists to support waiting for existing rendering,
1927 * not for emitting required flushes.
1928 */
1929 BUG_ON((obj->write_domain & I915_GEM_GPU_DOMAINS) != 0);
1930
1931 /* If there is rendering queued on the buffer being evicted, wait for
1932 * it.
1933 */
1934 if (obj_priv->active) {
1935#if WATCH_BUF
1936 DRM_INFO("%s: object %p wait for seqno %08x\n",
1937 __func__, obj, obj_priv->last_rendering_seqno);
1938#endif
1939 ret = i915_wait_request(dev,
1940 obj_priv->last_rendering_seqno, obj_priv->ring);
1941 if (ret != 0)
1942 return ret;
1943 }
1944
1945 return 0;
1946}
1947
1948/**
1949 * Unbinds an object from the GTT aperture.
1950 */
1951int
1952i915_gem_object_unbind(struct drm_gem_object *obj)
1953{
1954 struct drm_device *dev = obj->dev;
1955 drm_i915_private_t *dev_priv = dev->dev_private;
1956 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
1957 int ret = 0;
1958
1959#if WATCH_BUF
1960 DRM_INFO("%s:%d %p\n", __func__, __LINE__, obj);
1961 DRM_INFO("gtt_space %p\n", obj_priv->gtt_space);
1962#endif
1963 if (obj_priv->gtt_space == NULL)
1964 return 0;
1965
1966 if (obj_priv->pin_count != 0) {
1967 DRM_ERROR("Attempting to unbind pinned buffer\n");
1968 return -EINVAL;
1969 }
1970
1971 /* blow away mappings if mapped through GTT */
1972 i915_gem_release_mmap(obj);
1973
1974 /* Move the object to the CPU domain to ensure that
1975 * any possible CPU writes while it's not in the GTT
1976 * are flushed when we go to remap it. This will
1977 * also ensure that all pending GPU writes are finished
1978 * before we unbind.
1979 */
1980 ret = i915_gem_object_set_to_cpu_domain(obj, 1);
1981 if (ret == -ERESTARTSYS)
1982 return ret;
1983 /* Continue on if we fail due to EIO, the GPU is hung so we
1984 * should be safe and we need to cleanup or else we might
1985 * cause memory corruption through use-after-free.
1986 */
1987
1988 /* release the fence reg _after_ flushing */
1989 if (obj_priv->fence_reg != I915_FENCE_REG_NONE)
1990 i915_gem_clear_fence_reg(obj);
1991
1992 if (obj_priv->agp_mem != NULL) {
1993 drm_unbind_agp(obj_priv->agp_mem);
1994 drm_free_agp(obj_priv->agp_mem, obj->size / PAGE_SIZE);
1995 obj_priv->agp_mem = NULL;
1996 }
1997
1998 i915_gem_object_put_pages(obj);
1999 BUG_ON(obj_priv->pages_refcount);
2000
2001 if (obj_priv->gtt_space) {
2002 atomic_dec(&dev->gtt_count);
2003 atomic_sub(obj->size, &dev->gtt_memory);
2004
2005 drm_mm_put_block(obj_priv->gtt_space);
2006 obj_priv->gtt_space = NULL;
2007 }
2008
2009 /* Remove ourselves from the LRU list if present. */
2010 spin_lock(&dev_priv->mm.active_list_lock);
2011 if (!list_empty(&obj_priv->list))
2012 list_del_init(&obj_priv->list);
2013 spin_unlock(&dev_priv->mm.active_list_lock);
2014
2015 if (i915_gem_object_is_purgeable(obj_priv))
2016 i915_gem_object_truncate(obj);
2017
2018 trace_i915_gem_object_unbind(obj);
2019
2020 return ret;
2021}
2022
2023int
2024i915_gpu_idle(struct drm_device *dev)
2025{
2026 drm_i915_private_t *dev_priv = dev->dev_private;
2027 bool lists_empty;
2028 uint32_t seqno1, seqno2;
2029 int ret;
2030
2031 spin_lock(&dev_priv->mm.active_list_lock);
2032 lists_empty = (list_empty(&dev_priv->mm.flushing_list) &&
2033 list_empty(&dev_priv->render_ring.active_list) &&
2034 (!HAS_BSD(dev) ||
2035 list_empty(&dev_priv->bsd_ring.active_list)));
2036 spin_unlock(&dev_priv->mm.active_list_lock);
2037
2038 if (lists_empty)
2039 return 0;
2040
2041 /* Flush everything onto the inactive list. */
2042 i915_gem_flush(dev, I915_GEM_GPU_DOMAINS, I915_GEM_GPU_DOMAINS);
2043 seqno1 = i915_add_request(dev, NULL, I915_GEM_GPU_DOMAINS,
2044 &dev_priv->render_ring);
2045 if (seqno1 == 0)
2046 return -ENOMEM;
2047 ret = i915_wait_request(dev, seqno1, &dev_priv->render_ring);
2048
2049 if (HAS_BSD(dev)) {
2050 seqno2 = i915_add_request(dev, NULL, I915_GEM_GPU_DOMAINS,
2051 &dev_priv->bsd_ring);
2052 if (seqno2 == 0)
2053 return -ENOMEM;
2054
2055 ret = i915_wait_request(dev, seqno2, &dev_priv->bsd_ring);
2056 if (ret)
2057 return ret;
2058 }
2059
2060
2061 return ret;
2062}
2063
2064int
2065i915_gem_object_get_pages(struct drm_gem_object *obj,
2066 gfp_t gfpmask)
2067{
2068 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
2069 int page_count, i;
2070 struct address_space *mapping;
2071 struct inode *inode;
2072 struct page *page;
2073
2074 BUG_ON(obj_priv->pages_refcount
2075 == DRM_I915_GEM_OBJECT_MAX_PAGES_REFCOUNT);
2076
2077 if (obj_priv->pages_refcount++ != 0)
2078 return 0;
2079
2080 /* Get the list of pages out of our struct file. They'll be pinned
2081 * at this point until we release them.
2082 */
2083 page_count = obj->size / PAGE_SIZE;
2084 BUG_ON(obj_priv->pages != NULL);
2085 obj_priv->pages = drm_calloc_large(page_count, sizeof(struct page *));
2086 if (obj_priv->pages == NULL) {
2087 obj_priv->pages_refcount--;
2088 return -ENOMEM;
2089 }
2090
2091 inode = obj->filp->f_path.dentry->d_inode;
2092 mapping = inode->i_mapping;
2093 for (i = 0; i < page_count; i++) {
2094 page = read_cache_page_gfp(mapping, i,
2095 GFP_HIGHUSER |
2096 __GFP_COLD |
2097 __GFP_RECLAIMABLE |
2098 gfpmask);
2099 if (IS_ERR(page))
2100 goto err_pages;
2101
2102 obj_priv->pages[i] = page;
2103 }
2104
2105 if (obj_priv->tiling_mode != I915_TILING_NONE)
2106 i915_gem_object_do_bit_17_swizzle(obj);
2107
2108 return 0;
2109
2110err_pages:
2111 while (i--)
2112 page_cache_release(obj_priv->pages[i]);
2113
2114 drm_free_large(obj_priv->pages);
2115 obj_priv->pages = NULL;
2116 obj_priv->pages_refcount--;
2117 return PTR_ERR(page);
2118}
2119
2120static void sandybridge_write_fence_reg(struct drm_i915_fence_reg *reg)
2121{
2122 struct drm_gem_object *obj = reg->obj;
2123 struct drm_device *dev = obj->dev;
2124 drm_i915_private_t *dev_priv = dev->dev_private;
2125 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
2126 int regnum = obj_priv->fence_reg;
2127 uint64_t val;
2128
2129 val = (uint64_t)((obj_priv->gtt_offset + obj->size - 4096) &
2130 0xfffff000) << 32;
2131 val |= obj_priv->gtt_offset & 0xfffff000;
2132 val |= (uint64_t)((obj_priv->stride / 128) - 1) <<
2133 SANDYBRIDGE_FENCE_PITCH_SHIFT;
2134
2135 if (obj_priv->tiling_mode == I915_TILING_Y)
2136 val |= 1 << I965_FENCE_TILING_Y_SHIFT;
2137 val |= I965_FENCE_REG_VALID;
2138
2139 I915_WRITE64(FENCE_REG_SANDYBRIDGE_0 + (regnum * 8), val);
2140}
2141
2142static void i965_write_fence_reg(struct drm_i915_fence_reg *reg)
2143{
2144 struct drm_gem_object *obj = reg->obj;
2145 struct drm_device *dev = obj->dev;
2146 drm_i915_private_t *dev_priv = dev->dev_private;
2147 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
2148 int regnum = obj_priv->fence_reg;
2149 uint64_t val;
2150
2151 val = (uint64_t)((obj_priv->gtt_offset + obj->size - 4096) &
2152 0xfffff000) << 32;
2153 val |= obj_priv->gtt_offset & 0xfffff000;
2154 val |= ((obj_priv->stride / 128) - 1) << I965_FENCE_PITCH_SHIFT;
2155 if (obj_priv->tiling_mode == I915_TILING_Y)
2156 val |= 1 << I965_FENCE_TILING_Y_SHIFT;
2157 val |= I965_FENCE_REG_VALID;
2158
2159 I915_WRITE64(FENCE_REG_965_0 + (regnum * 8), val);
2160}
2161
2162static void i915_write_fence_reg(struct drm_i915_fence_reg *reg)
2163{
2164 struct drm_gem_object *obj = reg->obj;
2165 struct drm_device *dev = obj->dev;
2166 drm_i915_private_t *dev_priv = dev->dev_private;
2167 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
2168 int regnum = obj_priv->fence_reg;
2169 int tile_width;
2170 uint32_t fence_reg, val;
2171 uint32_t pitch_val;
2172
2173 if ((obj_priv->gtt_offset & ~I915_FENCE_START_MASK) ||
2174 (obj_priv->gtt_offset & (obj->size - 1))) {
2175 WARN(1, "%s: object 0x%08x not 1M or size (0x%zx) aligned\n",
2176 __func__, obj_priv->gtt_offset, obj->size);
2177 return;
2178 }
2179
2180 if (obj_priv->tiling_mode == I915_TILING_Y &&
2181 HAS_128_BYTE_Y_TILING(dev))
2182 tile_width = 128;
2183 else
2184 tile_width = 512;
2185
2186 /* Note: pitch better be a power of two tile widths */
2187 pitch_val = obj_priv->stride / tile_width;
2188 pitch_val = ffs(pitch_val) - 1;
2189
2190 if (obj_priv->tiling_mode == I915_TILING_Y &&
2191 HAS_128_BYTE_Y_TILING(dev))
2192 WARN_ON(pitch_val > I830_FENCE_MAX_PITCH_VAL);
2193 else
2194 WARN_ON(pitch_val > I915_FENCE_MAX_PITCH_VAL);
2195
2196 val = obj_priv->gtt_offset;
2197 if (obj_priv->tiling_mode == I915_TILING_Y)
2198 val |= 1 << I830_FENCE_TILING_Y_SHIFT;
2199 val |= I915_FENCE_SIZE_BITS(obj->size);
2200 val |= pitch_val << I830_FENCE_PITCH_SHIFT;
2201 val |= I830_FENCE_REG_VALID;
2202
2203 if (regnum < 8)
2204 fence_reg = FENCE_REG_830_0 + (regnum * 4);
2205 else
2206 fence_reg = FENCE_REG_945_8 + ((regnum - 8) * 4);
2207 I915_WRITE(fence_reg, val);
2208}
2209
2210static void i830_write_fence_reg(struct drm_i915_fence_reg *reg)
2211{
2212 struct drm_gem_object *obj = reg->obj;
2213 struct drm_device *dev = obj->dev;
2214 drm_i915_private_t *dev_priv = dev->dev_private;
2215 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
2216 int regnum = obj_priv->fence_reg;
2217 uint32_t val;
2218 uint32_t pitch_val;
2219 uint32_t fence_size_bits;
2220
2221 if ((obj_priv->gtt_offset & ~I830_FENCE_START_MASK) ||
2222 (obj_priv->gtt_offset & (obj->size - 1))) {
2223 WARN(1, "%s: object 0x%08x not 512K or size aligned\n",
2224 __func__, obj_priv->gtt_offset);
2225 return;
2226 }
2227
2228 pitch_val = obj_priv->stride / 128;
2229 pitch_val = ffs(pitch_val) - 1;
2230 WARN_ON(pitch_val > I830_FENCE_MAX_PITCH_VAL);
2231
2232 val = obj_priv->gtt_offset;
2233 if (obj_priv->tiling_mode == I915_TILING_Y)
2234 val |= 1 << I830_FENCE_TILING_Y_SHIFT;
2235 fence_size_bits = I830_FENCE_SIZE_BITS(obj->size);
2236 WARN_ON(fence_size_bits & ~0x00000f00);
2237 val |= fence_size_bits;
2238 val |= pitch_val << I830_FENCE_PITCH_SHIFT;
2239 val |= I830_FENCE_REG_VALID;
2240
2241 I915_WRITE(FENCE_REG_830_0 + (regnum * 4), val);
2242}
2243
2244static int i915_find_fence_reg(struct drm_device *dev)
2245{
2246 struct drm_i915_fence_reg *reg = NULL;
2247 struct drm_i915_gem_object *obj_priv = NULL;
2248 struct drm_i915_private *dev_priv = dev->dev_private;
2249 struct drm_gem_object *obj = NULL;
2250 int i, avail, ret;
2251
2252 /* First try to find a free reg */
2253 avail = 0;
2254 for (i = dev_priv->fence_reg_start; i < dev_priv->num_fence_regs; i++) {
2255 reg = &dev_priv->fence_regs[i];
2256 if (!reg->obj)
2257 return i;
2258
2259 obj_priv = to_intel_bo(reg->obj);
2260 if (!obj_priv->pin_count)
2261 avail++;
2262 }
2263
2264 if (avail == 0)
2265 return -ENOSPC;
2266
2267 /* None available, try to steal one or wait for a user to finish */
2268 i = I915_FENCE_REG_NONE;
2269 list_for_each_entry(reg, &dev_priv->mm.fence_list,
2270 lru_list) {
2271 obj = reg->obj;
2272 obj_priv = to_intel_bo(obj);
2273
2274 if (obj_priv->pin_count)
2275 continue;
2276
2277 /* found one! */
2278 i = obj_priv->fence_reg;
2279 break;
2280 }
2281
2282 BUG_ON(i == I915_FENCE_REG_NONE);
2283
2284 /* We only have a reference on obj from the active list. put_fence_reg
2285 * might drop that one, causing a use-after-free in it. So hold a
2286 * private reference to obj like the other callers of put_fence_reg
2287 * (set_tiling ioctl) do. */
2288 drm_gem_object_reference(obj);
2289 ret = i915_gem_object_put_fence_reg(obj);
2290 drm_gem_object_unreference(obj);
2291 if (ret != 0)
2292 return ret;
2293
2294 return i;
2295}
2296
2297/**
2298 * i915_gem_object_get_fence_reg - set up a fence reg for an object
2299 * @obj: object to map through a fence reg
2300 *
2301 * When mapping objects through the GTT, userspace wants to be able to write
2302 * to them without having to worry about swizzling if the object is tiled.
2303 *
2304 * This function walks the fence regs looking for a free one for @obj,
2305 * stealing one if it can't find any.
2306 *
2307 * It then sets up the reg based on the object's properties: address, pitch
2308 * and tiling format.
2309 */
2310int
2311i915_gem_object_get_fence_reg(struct drm_gem_object *obj)
2312{
2313 struct drm_device *dev = obj->dev;
2314 struct drm_i915_private *dev_priv = dev->dev_private;
2315 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
2316 struct drm_i915_fence_reg *reg = NULL;
2317 int ret;
2318
2319 /* Just update our place in the LRU if our fence is getting used. */
2320 if (obj_priv->fence_reg != I915_FENCE_REG_NONE) {
2321 reg = &dev_priv->fence_regs[obj_priv->fence_reg];
2322 list_move_tail(&reg->lru_list, &dev_priv->mm.fence_list);
2323 return 0;
2324 }
2325
2326 switch (obj_priv->tiling_mode) {
2327 case I915_TILING_NONE:
2328 WARN(1, "allocating a fence for non-tiled object?\n");
2329 break;
2330 case I915_TILING_X:
2331 if (!obj_priv->stride)
2332 return -EINVAL;
2333 WARN((obj_priv->stride & (512 - 1)),
2334 "object 0x%08x is X tiled but has non-512B pitch\n",
2335 obj_priv->gtt_offset);
2336 break;
2337 case I915_TILING_Y:
2338 if (!obj_priv->stride)
2339 return -EINVAL;
2340 WARN((obj_priv->stride & (128 - 1)),
2341 "object 0x%08x is Y tiled but has non-128B pitch\n",
2342 obj_priv->gtt_offset);
2343 break;
2344 }
2345
2346 ret = i915_find_fence_reg(dev);
2347 if (ret < 0)
2348 return ret;
2349
2350 obj_priv->fence_reg = ret;
2351 reg = &dev_priv->fence_regs[obj_priv->fence_reg];
2352 list_add_tail(&reg->lru_list, &dev_priv->mm.fence_list);
2353
2354 reg->obj = obj;
2355
2356 switch (INTEL_INFO(dev)->gen) {
2357 case 6:
2358 sandybridge_write_fence_reg(reg);
2359 break;
2360 case 5:
2361 case 4:
2362 i965_write_fence_reg(reg);
2363 break;
2364 case 3:
2365 i915_write_fence_reg(reg);
2366 break;
2367 case 2:
2368 i830_write_fence_reg(reg);
2369 break;
2370 }
2371
2372 trace_i915_gem_object_get_fence(obj, obj_priv->fence_reg,
2373 obj_priv->tiling_mode);
2374
2375 return 0;
2376}
2377
2378/**
2379 * i915_gem_clear_fence_reg - clear out fence register info
2380 * @obj: object to clear
2381 *
2382 * Zeroes out the fence register itself and clears out the associated
2383 * data structures in dev_priv and obj_priv.
2384 */
2385static void
2386i915_gem_clear_fence_reg(struct drm_gem_object *obj)
2387{
2388 struct drm_device *dev = obj->dev;
2389 drm_i915_private_t *dev_priv = dev->dev_private;
2390 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
2391 struct drm_i915_fence_reg *reg =
2392 &dev_priv->fence_regs[obj_priv->fence_reg];
2393 uint32_t fence_reg;
2394
2395 switch (INTEL_INFO(dev)->gen) {
2396 case 6:
2397 I915_WRITE64(FENCE_REG_SANDYBRIDGE_0 +
2398 (obj_priv->fence_reg * 8), 0);
2399 break;
2400 case 5:
2401 case 4:
2402 I915_WRITE64(FENCE_REG_965_0 + (obj_priv->fence_reg * 8), 0);
2403 break;
2404 case 3:
2405 if (obj_priv->fence_reg >= 8)
2406 fence_reg = FENCE_REG_945_8 + (obj_priv->fence_reg - 8) * 4;
2407 else
2408 case 2:
2409 fence_reg = FENCE_REG_830_0 + obj_priv->fence_reg * 4;
2410
2411 I915_WRITE(fence_reg, 0);
2412 break;
2413 }
2414
2415 reg->obj = NULL;
2416 obj_priv->fence_reg = I915_FENCE_REG_NONE;
2417 list_del_init(&reg->lru_list);
2418}
2419
2420/**
2421 * i915_gem_object_put_fence_reg - waits on outstanding fenced access
2422 * to the buffer to finish, and then resets the fence register.
2423 * @obj: tiled object holding a fence register.
2424 *
2425 * Zeroes out the fence register itself and clears out the associated
2426 * data structures in dev_priv and obj_priv.
2427 */
2428int
2429i915_gem_object_put_fence_reg(struct drm_gem_object *obj)
2430{
2431 struct drm_device *dev = obj->dev;
2432 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
2433
2434 if (obj_priv->fence_reg == I915_FENCE_REG_NONE)
2435 return 0;
2436
2437 /* If we've changed tiling, GTT-mappings of the object
2438 * need to re-fault to ensure that the correct fence register
2439 * setup is in place.
2440 */
2441 i915_gem_release_mmap(obj);
2442
2443 /* On the i915, GPU access to tiled buffers is via a fence,
2444 * therefore we must wait for any outstanding access to complete
2445 * before clearing the fence.
2446 */
2447 if (!IS_I965G(dev)) {
2448 int ret;
2449
2450 ret = i915_gem_object_flush_gpu_write_domain(obj);
2451 if (ret != 0)
2452 return ret;
2453
2454 ret = i915_gem_object_wait_rendering(obj);
2455 if (ret != 0)
2456 return ret;
2457 }
2458
2459 i915_gem_object_flush_gtt_write_domain(obj);
2460 i915_gem_clear_fence_reg (obj);
2461
2462 return 0;
2463}
2464
2465/**
2466 * Finds free space in the GTT aperture and binds the object there.
2467 */
2468static int
2469i915_gem_object_bind_to_gtt(struct drm_gem_object *obj, unsigned alignment)
2470{
2471 struct drm_device *dev = obj->dev;
2472 drm_i915_private_t *dev_priv = dev->dev_private;
2473 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
2474 struct drm_mm_node *free_space;
2475 gfp_t gfpmask = __GFP_NORETRY | __GFP_NOWARN;
2476 int ret;
2477
2478 if (obj_priv->madv != I915_MADV_WILLNEED) {
2479 DRM_ERROR("Attempting to bind a purgeable object\n");
2480 return -EINVAL;
2481 }
2482
2483 if (alignment == 0)
2484 alignment = i915_gem_get_gtt_alignment(obj);
2485 if (alignment & (i915_gem_get_gtt_alignment(obj) - 1)) {
2486 DRM_ERROR("Invalid object alignment requested %u\n", alignment);
2487 return -EINVAL;
2488 }
2489
2490 /* If the object is bigger than the entire aperture, reject it early
2491 * before evicting everything in a vain attempt to find space.
2492 */
2493 if (obj->size > dev->gtt_total) {
2494 DRM_ERROR("Attempting to bind an object larger than the aperture\n");
2495 return -E2BIG;
2496 }
2497
2498 search_free:
2499 free_space = drm_mm_search_free(&dev_priv->mm.gtt_space,
2500 obj->size, alignment, 0);
2501 if (free_space != NULL) {
2502 obj_priv->gtt_space = drm_mm_get_block(free_space, obj->size,
2503 alignment);
2504 if (obj_priv->gtt_space != NULL)
2505 obj_priv->gtt_offset = obj_priv->gtt_space->start;
2506 }
2507 if (obj_priv->gtt_space == NULL) {
2508 /* If the gtt is empty and we're still having trouble
2509 * fitting our object in, we're out of memory.
2510 */
2511#if WATCH_LRU
2512 DRM_INFO("%s: GTT full, evicting something\n", __func__);
2513#endif
2514 ret = i915_gem_evict_something(dev, obj->size, alignment);
2515 if (ret)
2516 return ret;
2517
2518 goto search_free;
2519 }
2520
2521#if WATCH_BUF
2522 DRM_INFO("Binding object of size %zd at 0x%08x\n",
2523 obj->size, obj_priv->gtt_offset);
2524#endif
2525 ret = i915_gem_object_get_pages(obj, gfpmask);
2526 if (ret) {
2527 drm_mm_put_block(obj_priv->gtt_space);
2528 obj_priv->gtt_space = NULL;
2529
2530 if (ret == -ENOMEM) {
2531 /* first try to clear up some space from the GTT */
2532 ret = i915_gem_evict_something(dev, obj->size,
2533 alignment);
2534 if (ret) {
2535 /* now try to shrink everyone else */
2536 if (gfpmask) {
2537 gfpmask = 0;
2538 goto search_free;
2539 }
2540
2541 return ret;
2542 }
2543
2544 goto search_free;
2545 }
2546
2547 return ret;
2548 }
2549
2550 /* Create an AGP memory structure pointing at our pages, and bind it
2551 * into the GTT.
2552 */
2553 obj_priv->agp_mem = drm_agp_bind_pages(dev,
2554 obj_priv->pages,
2555 obj->size >> PAGE_SHIFT,
2556 obj_priv->gtt_offset,
2557 obj_priv->agp_type);
2558 if (obj_priv->agp_mem == NULL) {
2559 i915_gem_object_put_pages(obj);
2560 drm_mm_put_block(obj_priv->gtt_space);
2561 obj_priv->gtt_space = NULL;
2562
2563 ret = i915_gem_evict_something(dev, obj->size, alignment);
2564 if (ret)
2565 return ret;
2566
2567 goto search_free;
2568 }
2569 atomic_inc(&dev->gtt_count);
2570 atomic_add(obj->size, &dev->gtt_memory);
2571
2572 /* keep track of bounds object by adding it to the inactive list */
2573 list_add_tail(&obj_priv->list, &dev_priv->mm.inactive_list);
2574
2575 /* Assert that the object is not currently in any GPU domain. As it
2576 * wasn't in the GTT, there shouldn't be any way it could have been in
2577 * a GPU cache
2578 */
2579 BUG_ON(obj->read_domains & I915_GEM_GPU_DOMAINS);
2580 BUG_ON(obj->write_domain & I915_GEM_GPU_DOMAINS);
2581
2582 trace_i915_gem_object_bind(obj, obj_priv->gtt_offset);
2583
2584 return 0;
2585}
2586
2587void
2588i915_gem_clflush_object(struct drm_gem_object *obj)
2589{
2590 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
2591
2592 /* If we don't have a page list set up, then we're not pinned
2593 * to GPU, and we can ignore the cache flush because it'll happen
2594 * again at bind time.
2595 */
2596 if (obj_priv->pages == NULL)
2597 return;
2598
2599 trace_i915_gem_object_clflush(obj);
2600
2601 drm_clflush_pages(obj_priv->pages, obj->size / PAGE_SIZE);
2602}
2603
2604/** Flushes any GPU write domain for the object if it's dirty. */
2605static int
2606i915_gem_object_flush_gpu_write_domain(struct drm_gem_object *obj)
2607{
2608 struct drm_device *dev = obj->dev;
2609 uint32_t old_write_domain;
2610 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
2611
2612 if ((obj->write_domain & I915_GEM_GPU_DOMAINS) == 0)
2613 return 0;
2614
2615 /* Queue the GPU write cache flushing we need. */
2616 old_write_domain = obj->write_domain;
2617 i915_gem_flush(dev, 0, obj->write_domain);
2618 if (i915_add_request(dev, NULL, obj->write_domain, obj_priv->ring) == 0)
2619 return -ENOMEM;
2620
2621 trace_i915_gem_object_change_domain(obj,
2622 obj->read_domains,
2623 old_write_domain);
2624 return 0;
2625}
2626
2627/** Flushes the GTT write domain for the object if it's dirty. */
2628static void
2629i915_gem_object_flush_gtt_write_domain(struct drm_gem_object *obj)
2630{
2631 uint32_t old_write_domain;
2632
2633 if (obj->write_domain != I915_GEM_DOMAIN_GTT)
2634 return;
2635
2636 /* No actual flushing is required for the GTT write domain. Writes
2637 * to it immediately go to main memory as far as we know, so there's
2638 * no chipset flush. It also doesn't land in render cache.
2639 */
2640 old_write_domain = obj->write_domain;
2641 obj->write_domain = 0;
2642
2643 trace_i915_gem_object_change_domain(obj,
2644 obj->read_domains,
2645 old_write_domain);
2646}
2647
2648/** Flushes the CPU write domain for the object if it's dirty. */
2649static void
2650i915_gem_object_flush_cpu_write_domain(struct drm_gem_object *obj)
2651{
2652 struct drm_device *dev = obj->dev;
2653 uint32_t old_write_domain;
2654
2655 if (obj->write_domain != I915_GEM_DOMAIN_CPU)
2656 return;
2657
2658 i915_gem_clflush_object(obj);
2659 drm_agp_chipset_flush(dev);
2660 old_write_domain = obj->write_domain;
2661 obj->write_domain = 0;
2662
2663 trace_i915_gem_object_change_domain(obj,
2664 obj->read_domains,
2665 old_write_domain);
2666}
2667
2668int
2669i915_gem_object_flush_write_domain(struct drm_gem_object *obj)
2670{
2671 int ret = 0;
2672
2673 switch (obj->write_domain) {
2674 case I915_GEM_DOMAIN_GTT:
2675 i915_gem_object_flush_gtt_write_domain(obj);
2676 break;
2677 case I915_GEM_DOMAIN_CPU:
2678 i915_gem_object_flush_cpu_write_domain(obj);
2679 break;
2680 default:
2681 ret = i915_gem_object_flush_gpu_write_domain(obj);
2682 break;
2683 }
2684
2685 return ret;
2686}
2687
2688/**
2689 * Moves a single object to the GTT read, and possibly write domain.
2690 *
2691 * This function returns when the move is complete, including waiting on
2692 * flushes to occur.
2693 */
2694int
2695i915_gem_object_set_to_gtt_domain(struct drm_gem_object *obj, int write)
2696{
2697 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
2698 uint32_t old_write_domain, old_read_domains;
2699 int ret;
2700
2701 /* Not valid to be called on unbound objects. */
2702 if (obj_priv->gtt_space == NULL)
2703 return -EINVAL;
2704
2705 ret = i915_gem_object_flush_gpu_write_domain(obj);
2706 if (ret != 0)
2707 return ret;
2708
2709 /* Wait on any GPU rendering and flushing to occur. */
2710 ret = i915_gem_object_wait_rendering(obj);
2711 if (ret != 0)
2712 return ret;
2713
2714 old_write_domain = obj->write_domain;
2715 old_read_domains = obj->read_domains;
2716
2717 /* If we're writing through the GTT domain, then CPU and GPU caches
2718 * will need to be invalidated at next use.
2719 */
2720 if (write)
2721 obj->read_domains &= I915_GEM_DOMAIN_GTT;
2722
2723 i915_gem_object_flush_cpu_write_domain(obj);
2724
2725 /* It should now be out of any other write domains, and we can update
2726 * the domain values for our changes.
2727 */
2728 BUG_ON((obj->write_domain & ~I915_GEM_DOMAIN_GTT) != 0);
2729 obj->read_domains |= I915_GEM_DOMAIN_GTT;
2730 if (write) {
2731 obj->write_domain = I915_GEM_DOMAIN_GTT;
2732 obj_priv->dirty = 1;
2733 }
2734
2735 trace_i915_gem_object_change_domain(obj,
2736 old_read_domains,
2737 old_write_domain);
2738
2739 return 0;
2740}
2741
2742/*
2743 * Prepare buffer for display plane. Use uninterruptible for possible flush
2744 * wait, as in modesetting process we're not supposed to be interrupted.
2745 */
2746int
2747i915_gem_object_set_to_display_plane(struct drm_gem_object *obj)
2748{
2749 struct drm_device *dev = obj->dev;
2750 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
2751 uint32_t old_write_domain, old_read_domains;
2752 int ret;
2753
2754 /* Not valid to be called on unbound objects. */
2755 if (obj_priv->gtt_space == NULL)
2756 return -EINVAL;
2757
2758 ret = i915_gem_object_flush_gpu_write_domain(obj);
2759 if (ret)
2760 return ret;
2761
2762 /* Wait on any GPU rendering and flushing to occur. */
2763 if (obj_priv->active) {
2764#if WATCH_BUF
2765 DRM_INFO("%s: object %p wait for seqno %08x\n",
2766 __func__, obj, obj_priv->last_rendering_seqno);
2767#endif
2768 ret = i915_do_wait_request(dev,
2769 obj_priv->last_rendering_seqno,
2770 0,
2771 obj_priv->ring);
2772 if (ret != 0)
2773 return ret;
2774 }
2775
2776 i915_gem_object_flush_cpu_write_domain(obj);
2777
2778 old_write_domain = obj->write_domain;
2779 old_read_domains = obj->read_domains;
2780
2781 /* It should now be out of any other write domains, and we can update
2782 * the domain values for our changes.
2783 */
2784 BUG_ON((obj->write_domain & ~I915_GEM_DOMAIN_GTT) != 0);
2785 obj->read_domains = I915_GEM_DOMAIN_GTT;
2786 obj->write_domain = I915_GEM_DOMAIN_GTT;
2787 obj_priv->dirty = 1;
2788
2789 trace_i915_gem_object_change_domain(obj,
2790 old_read_domains,
2791 old_write_domain);
2792
2793 return 0;
2794}
2795
2796/**
2797 * Moves a single object to the CPU read, and possibly write domain.
2798 *
2799 * This function returns when the move is complete, including waiting on
2800 * flushes to occur.
2801 */
2802static int
2803i915_gem_object_set_to_cpu_domain(struct drm_gem_object *obj, int write)
2804{
2805 uint32_t old_write_domain, old_read_domains;
2806 int ret;
2807
2808 ret = i915_gem_object_flush_gpu_write_domain(obj);
2809 if (ret)
2810 return ret;
2811
2812 /* Wait on any GPU rendering and flushing to occur. */
2813 ret = i915_gem_object_wait_rendering(obj);
2814 if (ret != 0)
2815 return ret;
2816
2817 i915_gem_object_flush_gtt_write_domain(obj);
2818
2819 /* If we have a partially-valid cache of the object in the CPU,
2820 * finish invalidating it and free the per-page flags.
2821 */
2822 i915_gem_object_set_to_full_cpu_read_domain(obj);
2823
2824 old_write_domain = obj->write_domain;
2825 old_read_domains = obj->read_domains;
2826
2827 /* Flush the CPU cache if it's still invalid. */
2828 if ((obj->read_domains & I915_GEM_DOMAIN_CPU) == 0) {
2829 i915_gem_clflush_object(obj);
2830
2831 obj->read_domains |= I915_GEM_DOMAIN_CPU;
2832 }
2833
2834 /* It should now be out of any other write domains, and we can update
2835 * the domain values for our changes.
2836 */
2837 BUG_ON((obj->write_domain & ~I915_GEM_DOMAIN_CPU) != 0);
2838
2839 /* If we're writing through the CPU, then the GPU read domains will
2840 * need to be invalidated at next use.
2841 */
2842 if (write) {
2843 obj->read_domains &= I915_GEM_DOMAIN_CPU;
2844 obj->write_domain = I915_GEM_DOMAIN_CPU;
2845 }
2846
2847 trace_i915_gem_object_change_domain(obj,
2848 old_read_domains,
2849 old_write_domain);
2850
2851 return 0;
2852}
2853
2854/*
2855 * Set the next domain for the specified object. This
2856 * may not actually perform the necessary flushing/invaliding though,
2857 * as that may want to be batched with other set_domain operations
2858 *
2859 * This is (we hope) the only really tricky part of gem. The goal
2860 * is fairly simple -- track which caches hold bits of the object
2861 * and make sure they remain coherent. A few concrete examples may
2862 * help to explain how it works. For shorthand, we use the notation
2863 * (read_domains, write_domain), e.g. (CPU, CPU) to indicate the
2864 * a pair of read and write domain masks.
2865 *
2866 * Case 1: the batch buffer
2867 *
2868 * 1. Allocated
2869 * 2. Written by CPU
2870 * 3. Mapped to GTT
2871 * 4. Read by GPU
2872 * 5. Unmapped from GTT
2873 * 6. Freed
2874 *
2875 * Let's take these a step at a time
2876 *
2877 * 1. Allocated
2878 * Pages allocated from the kernel may still have
2879 * cache contents, so we set them to (CPU, CPU) always.
2880 * 2. Written by CPU (using pwrite)
2881 * The pwrite function calls set_domain (CPU, CPU) and
2882 * this function does nothing (as nothing changes)
2883 * 3. Mapped by GTT
2884 * This function asserts that the object is not
2885 * currently in any GPU-based read or write domains
2886 * 4. Read by GPU
2887 * i915_gem_execbuffer calls set_domain (COMMAND, 0).
2888 * As write_domain is zero, this function adds in the
2889 * current read domains (CPU+COMMAND, 0).
2890 * flush_domains is set to CPU.
2891 * invalidate_domains is set to COMMAND
2892 * clflush is run to get data out of the CPU caches
2893 * then i915_dev_set_domain calls i915_gem_flush to
2894 * emit an MI_FLUSH and drm_agp_chipset_flush
2895 * 5. Unmapped from GTT
2896 * i915_gem_object_unbind calls set_domain (CPU, CPU)
2897 * flush_domains and invalidate_domains end up both zero
2898 * so no flushing/invalidating happens
2899 * 6. Freed
2900 * yay, done
2901 *
2902 * Case 2: The shared render buffer
2903 *
2904 * 1. Allocated
2905 * 2. Mapped to GTT
2906 * 3. Read/written by GPU
2907 * 4. set_domain to (CPU,CPU)
2908 * 5. Read/written by CPU
2909 * 6. Read/written by GPU
2910 *
2911 * 1. Allocated
2912 * Same as last example, (CPU, CPU)
2913 * 2. Mapped to GTT
2914 * Nothing changes (assertions find that it is not in the GPU)
2915 * 3. Read/written by GPU
2916 * execbuffer calls set_domain (RENDER, RENDER)
2917 * flush_domains gets CPU
2918 * invalidate_domains gets GPU
2919 * clflush (obj)
2920 * MI_FLUSH and drm_agp_chipset_flush
2921 * 4. set_domain (CPU, CPU)
2922 * flush_domains gets GPU
2923 * invalidate_domains gets CPU
2924 * wait_rendering (obj) to make sure all drawing is complete.
2925 * This will include an MI_FLUSH to get the data from GPU
2926 * to memory
2927 * clflush (obj) to invalidate the CPU cache
2928 * Another MI_FLUSH in i915_gem_flush (eliminate this somehow?)
2929 * 5. Read/written by CPU
2930 * cache lines are loaded and dirtied
2931 * 6. Read written by GPU
2932 * Same as last GPU access
2933 *
2934 * Case 3: The constant buffer
2935 *
2936 * 1. Allocated
2937 * 2. Written by CPU
2938 * 3. Read by GPU
2939 * 4. Updated (written) by CPU again
2940 * 5. Read by GPU
2941 *
2942 * 1. Allocated
2943 * (CPU, CPU)
2944 * 2. Written by CPU
2945 * (CPU, CPU)
2946 * 3. Read by GPU
2947 * (CPU+RENDER, 0)
2948 * flush_domains = CPU
2949 * invalidate_domains = RENDER
2950 * clflush (obj)
2951 * MI_FLUSH
2952 * drm_agp_chipset_flush
2953 * 4. Updated (written) by CPU again
2954 * (CPU, CPU)
2955 * flush_domains = 0 (no previous write domain)
2956 * invalidate_domains = 0 (no new read domains)
2957 * 5. Read by GPU
2958 * (CPU+RENDER, 0)
2959 * flush_domains = CPU
2960 * invalidate_domains = RENDER
2961 * clflush (obj)
2962 * MI_FLUSH
2963 * drm_agp_chipset_flush
2964 */
2965static void
2966i915_gem_object_set_to_gpu_domain(struct drm_gem_object *obj)
2967{
2968 struct drm_device *dev = obj->dev;
2969 drm_i915_private_t *dev_priv = dev->dev_private;
2970 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
2971 uint32_t invalidate_domains = 0;
2972 uint32_t flush_domains = 0;
2973 uint32_t old_read_domains;
2974
2975 BUG_ON(obj->pending_read_domains & I915_GEM_DOMAIN_CPU);
2976 BUG_ON(obj->pending_write_domain == I915_GEM_DOMAIN_CPU);
2977
2978 intel_mark_busy(dev, obj);
2979
2980#if WATCH_BUF
2981 DRM_INFO("%s: object %p read %08x -> %08x write %08x -> %08x\n",
2982 __func__, obj,
2983 obj->read_domains, obj->pending_read_domains,
2984 obj->write_domain, obj->pending_write_domain);
2985#endif
2986 /*
2987 * If the object isn't moving to a new write domain,
2988 * let the object stay in multiple read domains
2989 */
2990 if (obj->pending_write_domain == 0)
2991 obj->pending_read_domains |= obj->read_domains;
2992 else
2993 obj_priv->dirty = 1;
2994
2995 /*
2996 * Flush the current write domain if
2997 * the new read domains don't match. Invalidate
2998 * any read domains which differ from the old
2999 * write domain
3000 */
3001 if (obj->write_domain &&
3002 obj->write_domain != obj->pending_read_domains) {
3003 flush_domains |= obj->write_domain;
3004 invalidate_domains |=
3005 obj->pending_read_domains & ~obj->write_domain;
3006 }
3007 /*
3008 * Invalidate any read caches which may have
3009 * stale data. That is, any new read domains.
3010 */
3011 invalidate_domains |= obj->pending_read_domains & ~obj->read_domains;
3012 if ((flush_domains | invalidate_domains) & I915_GEM_DOMAIN_CPU) {
3013#if WATCH_BUF
3014 DRM_INFO("%s: CPU domain flush %08x invalidate %08x\n",
3015 __func__, flush_domains, invalidate_domains);
3016#endif
3017 i915_gem_clflush_object(obj);
3018 }
3019
3020 old_read_domains = obj->read_domains;
3021
3022 /* The actual obj->write_domain will be updated with
3023 * pending_write_domain after we emit the accumulated flush for all
3024 * of our domain changes in execbuffers (which clears objects'
3025 * write_domains). So if we have a current write domain that we
3026 * aren't changing, set pending_write_domain to that.
3027 */
3028 if (flush_domains == 0 && obj->pending_write_domain == 0)
3029 obj->pending_write_domain = obj->write_domain;
3030 obj->read_domains = obj->pending_read_domains;
3031
3032 if (flush_domains & I915_GEM_GPU_DOMAINS) {
3033 if (obj_priv->ring == &dev_priv->render_ring)
3034 dev_priv->flush_rings |= FLUSH_RENDER_RING;
3035 else if (obj_priv->ring == &dev_priv->bsd_ring)
3036 dev_priv->flush_rings |= FLUSH_BSD_RING;
3037 }
3038
3039 dev->invalidate_domains |= invalidate_domains;
3040 dev->flush_domains |= flush_domains;
3041#if WATCH_BUF
3042 DRM_INFO("%s: read %08x write %08x invalidate %08x flush %08x\n",
3043 __func__,
3044 obj->read_domains, obj->write_domain,
3045 dev->invalidate_domains, dev->flush_domains);
3046#endif
3047
3048 trace_i915_gem_object_change_domain(obj,
3049 old_read_domains,
3050 obj->write_domain);
3051}
3052
3053/**
3054 * Moves the object from a partially CPU read to a full one.
3055 *
3056 * Note that this only resolves i915_gem_object_set_cpu_read_domain_range(),
3057 * and doesn't handle transitioning from !(read_domains & I915_GEM_DOMAIN_CPU).
3058 */
3059static void
3060i915_gem_object_set_to_full_cpu_read_domain(struct drm_gem_object *obj)
3061{
3062 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
3063
3064 if (!obj_priv->page_cpu_valid)
3065 return;
3066
3067 /* If we're partially in the CPU read domain, finish moving it in.
3068 */
3069 if (obj->read_domains & I915_GEM_DOMAIN_CPU) {
3070 int i;
3071
3072 for (i = 0; i <= (obj->size - 1) / PAGE_SIZE; i++) {
3073 if (obj_priv->page_cpu_valid[i])
3074 continue;
3075 drm_clflush_pages(obj_priv->pages + i, 1);
3076 }
3077 }
3078
3079 /* Free the page_cpu_valid mappings which are now stale, whether
3080 * or not we've got I915_GEM_DOMAIN_CPU.
3081 */
3082 kfree(obj_priv->page_cpu_valid);
3083 obj_priv->page_cpu_valid = NULL;
3084}
3085
3086/**
3087 * Set the CPU read domain on a range of the object.
3088 *
3089 * The object ends up with I915_GEM_DOMAIN_CPU in its read flags although it's
3090 * not entirely valid. The page_cpu_valid member of the object flags which
3091 * pages have been flushed, and will be respected by
3092 * i915_gem_object_set_to_cpu_domain() if it's called on to get a valid mapping
3093 * of the whole object.
3094 *
3095 * This function returns when the move is complete, including waiting on
3096 * flushes to occur.
3097 */
3098static int
3099i915_gem_object_set_cpu_read_domain_range(struct drm_gem_object *obj,
3100 uint64_t offset, uint64_t size)
3101{
3102 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
3103 uint32_t old_read_domains;
3104 int i, ret;
3105
3106 if (offset == 0 && size == obj->size)
3107 return i915_gem_object_set_to_cpu_domain(obj, 0);
3108
3109 ret = i915_gem_object_flush_gpu_write_domain(obj);
3110 if (ret)
3111 return ret;
3112
3113 /* Wait on any GPU rendering and flushing to occur. */
3114 ret = i915_gem_object_wait_rendering(obj);
3115 if (ret != 0)
3116 return ret;
3117 i915_gem_object_flush_gtt_write_domain(obj);
3118
3119 /* If we're already fully in the CPU read domain, we're done. */
3120 if (obj_priv->page_cpu_valid == NULL &&
3121 (obj->read_domains & I915_GEM_DOMAIN_CPU) != 0)
3122 return 0;
3123
3124 /* Otherwise, create/clear the per-page CPU read domain flag if we're
3125 * newly adding I915_GEM_DOMAIN_CPU
3126 */
3127 if (obj_priv->page_cpu_valid == NULL) {
3128 obj_priv->page_cpu_valid = kzalloc(obj->size / PAGE_SIZE,
3129 GFP_KERNEL);
3130 if (obj_priv->page_cpu_valid == NULL)
3131 return -ENOMEM;
3132 } else if ((obj->read_domains & I915_GEM_DOMAIN_CPU) == 0)
3133 memset(obj_priv->page_cpu_valid, 0, obj->size / PAGE_SIZE);
3134
3135 /* Flush the cache on any pages that are still invalid from the CPU's
3136 * perspective.
3137 */
3138 for (i = offset / PAGE_SIZE; i <= (offset + size - 1) / PAGE_SIZE;
3139 i++) {
3140 if (obj_priv->page_cpu_valid[i])
3141 continue;
3142
3143 drm_clflush_pages(obj_priv->pages + i, 1);
3144
3145 obj_priv->page_cpu_valid[i] = 1;
3146 }
3147
3148 /* It should now be out of any other write domains, and we can update
3149 * the domain values for our changes.
3150 */
3151 BUG_ON((obj->write_domain & ~I915_GEM_DOMAIN_CPU) != 0);
3152
3153 old_read_domains = obj->read_domains;
3154 obj->read_domains |= I915_GEM_DOMAIN_CPU;
3155
3156 trace_i915_gem_object_change_domain(obj,
3157 old_read_domains,
3158 obj->write_domain);
3159
3160 return 0;
3161}
3162
3163/**
3164 * Pin an object to the GTT and evaluate the relocations landing in it.
3165 */
3166static int
3167i915_gem_object_pin_and_relocate(struct drm_gem_object *obj,
3168 struct drm_file *file_priv,
3169 struct drm_i915_gem_exec_object2 *entry,
3170 struct drm_i915_gem_relocation_entry *relocs)
3171{
3172 struct drm_device *dev = obj->dev;
3173 drm_i915_private_t *dev_priv = dev->dev_private;
3174 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
3175 int i, ret;
3176 void __iomem *reloc_page;
3177 bool need_fence;
3178
3179 need_fence = entry->flags & EXEC_OBJECT_NEEDS_FENCE &&
3180 obj_priv->tiling_mode != I915_TILING_NONE;
3181
3182 /* Check fence reg constraints and rebind if necessary */
3183 if (need_fence &&
3184 !i915_gem_object_fence_offset_ok(obj,
3185 obj_priv->tiling_mode)) {
3186 ret = i915_gem_object_unbind(obj);
3187 if (ret)
3188 return ret;
3189 }
3190
3191 /* Choose the GTT offset for our buffer and put it there. */
3192 ret = i915_gem_object_pin(obj, (uint32_t) entry->alignment);
3193 if (ret)
3194 return ret;
3195
3196 /*
3197 * Pre-965 chips need a fence register set up in order to
3198 * properly handle blits to/from tiled surfaces.
3199 */
3200 if (need_fence) {
3201 ret = i915_gem_object_get_fence_reg(obj);
3202 if (ret != 0) {
3203 i915_gem_object_unpin(obj);
3204 return ret;
3205 }
3206 }
3207
3208 entry->offset = obj_priv->gtt_offset;
3209
3210 /* Apply the relocations, using the GTT aperture to avoid cache
3211 * flushing requirements.
3212 */
3213 for (i = 0; i < entry->relocation_count; i++) {
3214 struct drm_i915_gem_relocation_entry *reloc= &relocs[i];
3215 struct drm_gem_object *target_obj;
3216 struct drm_i915_gem_object *target_obj_priv;
3217 uint32_t reloc_val, reloc_offset;
3218 uint32_t __iomem *reloc_entry;
3219
3220 target_obj = drm_gem_object_lookup(obj->dev, file_priv,
3221 reloc->target_handle);
3222 if (target_obj == NULL) {
3223 i915_gem_object_unpin(obj);
3224 return -ENOENT;
3225 }
3226 target_obj_priv = to_intel_bo(target_obj);
3227
3228#if WATCH_RELOC
3229 DRM_INFO("%s: obj %p offset %08x target %d "
3230 "read %08x write %08x gtt %08x "
3231 "presumed %08x delta %08x\n",
3232 __func__,
3233 obj,
3234 (int) reloc->offset,
3235 (int) reloc->target_handle,
3236 (int) reloc->read_domains,
3237 (int) reloc->write_domain,
3238 (int) target_obj_priv->gtt_offset,
3239 (int) reloc->presumed_offset,
3240 reloc->delta);
3241#endif
3242
3243 /* The target buffer should have appeared before us in the
3244 * exec_object list, so it should have a GTT space bound by now.
3245 */
3246 if (target_obj_priv->gtt_space == NULL) {
3247 DRM_ERROR("No GTT space found for object %d\n",
3248 reloc->target_handle);
3249 drm_gem_object_unreference(target_obj);
3250 i915_gem_object_unpin(obj);
3251 return -EINVAL;
3252 }
3253
3254 /* Validate that the target is in a valid r/w GPU domain */
3255 if (reloc->write_domain & (reloc->write_domain - 1)) {
3256 DRM_ERROR("reloc with multiple write domains: "
3257 "obj %p target %d offset %d "
3258 "read %08x write %08x",
3259 obj, reloc->target_handle,
3260 (int) reloc->offset,
3261 reloc->read_domains,
3262 reloc->write_domain);
3263 drm_gem_object_unreference(target_obj);
3264 i915_gem_object_unpin(obj);
3265 return -EINVAL;
3266 }
3267 if (reloc->write_domain & I915_GEM_DOMAIN_CPU ||
3268 reloc->read_domains & I915_GEM_DOMAIN_CPU) {
3269 DRM_ERROR("reloc with read/write CPU domains: "
3270 "obj %p target %d offset %d "
3271 "read %08x write %08x",
3272 obj, reloc->target_handle,
3273 (int) reloc->offset,
3274 reloc->read_domains,
3275 reloc->write_domain);
3276 drm_gem_object_unreference(target_obj);
3277 i915_gem_object_unpin(obj);
3278 return -EINVAL;
3279 }
3280 if (reloc->write_domain && target_obj->pending_write_domain &&
3281 reloc->write_domain != target_obj->pending_write_domain) {
3282 DRM_ERROR("Write domain conflict: "
3283 "obj %p target %d offset %d "
3284 "new %08x old %08x\n",
3285 obj, reloc->target_handle,
3286 (int) reloc->offset,
3287 reloc->write_domain,
3288 target_obj->pending_write_domain);
3289 drm_gem_object_unreference(target_obj);
3290 i915_gem_object_unpin(obj);
3291 return -EINVAL;
3292 }
3293
3294 target_obj->pending_read_domains |= reloc->read_domains;
3295 target_obj->pending_write_domain |= reloc->write_domain;
3296
3297 /* If the relocation already has the right value in it, no
3298 * more work needs to be done.
3299 */
3300 if (target_obj_priv->gtt_offset == reloc->presumed_offset) {
3301 drm_gem_object_unreference(target_obj);
3302 continue;
3303 }
3304
3305 /* Check that the relocation address is valid... */
3306 if (reloc->offset > obj->size - 4) {
3307 DRM_ERROR("Relocation beyond object bounds: "
3308 "obj %p target %d offset %d size %d.\n",
3309 obj, reloc->target_handle,
3310 (int) reloc->offset, (int) obj->size);
3311 drm_gem_object_unreference(target_obj);
3312 i915_gem_object_unpin(obj);
3313 return -EINVAL;
3314 }
3315 if (reloc->offset & 3) {
3316 DRM_ERROR("Relocation not 4-byte aligned: "
3317 "obj %p target %d offset %d.\n",
3318 obj, reloc->target_handle,
3319 (int) reloc->offset);
3320 drm_gem_object_unreference(target_obj);
3321 i915_gem_object_unpin(obj);
3322 return -EINVAL;
3323 }
3324
3325 /* and points to somewhere within the target object. */
3326 if (reloc->delta >= target_obj->size) {
3327 DRM_ERROR("Relocation beyond target object bounds: "
3328 "obj %p target %d delta %d size %d.\n",
3329 obj, reloc->target_handle,
3330 (int) reloc->delta, (int) target_obj->size);
3331 drm_gem_object_unreference(target_obj);
3332 i915_gem_object_unpin(obj);
3333 return -EINVAL;
3334 }
3335
3336 ret = i915_gem_object_set_to_gtt_domain(obj, 1);
3337 if (ret != 0) {
3338 drm_gem_object_unreference(target_obj);
3339 i915_gem_object_unpin(obj);
3340 return -EINVAL;
3341 }
3342
3343 /* Map the page containing the relocation we're going to
3344 * perform.
3345 */
3346 reloc_offset = obj_priv->gtt_offset + reloc->offset;
3347 reloc_page = io_mapping_map_atomic_wc(dev_priv->mm.gtt_mapping,
3348 (reloc_offset &
3349 ~(PAGE_SIZE - 1)),
3350 KM_USER0);
3351 reloc_entry = (uint32_t __iomem *)(reloc_page +
3352 (reloc_offset & (PAGE_SIZE - 1)));
3353 reloc_val = target_obj_priv->gtt_offset + reloc->delta;
3354
3355#if WATCH_BUF
3356 DRM_INFO("Applied relocation: %p@0x%08x %08x -> %08x\n",
3357 obj, (unsigned int) reloc->offset,
3358 readl(reloc_entry), reloc_val);
3359#endif
3360 writel(reloc_val, reloc_entry);
3361 io_mapping_unmap_atomic(reloc_page, KM_USER0);
3362
3363 /* The updated presumed offset for this entry will be
3364 * copied back out to the user.
3365 */
3366 reloc->presumed_offset = target_obj_priv->gtt_offset;
3367
3368 drm_gem_object_unreference(target_obj);
3369 }
3370
3371#if WATCH_BUF
3372 if (0)
3373 i915_gem_dump_object(obj, 128, __func__, ~0);
3374#endif
3375 return 0;
3376}
3377
3378/* Throttle our rendering by waiting until the ring has completed our requests
3379 * emitted over 20 msec ago.
3380 *
3381 * Note that if we were to use the current jiffies each time around the loop,
3382 * we wouldn't escape the function with any frames outstanding if the time to
3383 * render a frame was over 20ms.
3384 *
3385 * This should get us reasonable parallelism between CPU and GPU but also
3386 * relatively low latency when blocking on a particular request to finish.
3387 */
3388static int
3389i915_gem_ring_throttle(struct drm_device *dev, struct drm_file *file_priv)
3390{
3391 struct drm_i915_file_private *i915_file_priv = file_priv->driver_priv;
3392 int ret = 0;
3393 unsigned long recent_enough = jiffies - msecs_to_jiffies(20);
3394
3395 mutex_lock(&dev->struct_mutex);
3396 while (!list_empty(&i915_file_priv->mm.request_list)) {
3397 struct drm_i915_gem_request *request;
3398
3399 request = list_first_entry(&i915_file_priv->mm.request_list,
3400 struct drm_i915_gem_request,
3401 client_list);
3402
3403 if (time_after_eq(request->emitted_jiffies, recent_enough))
3404 break;
3405
3406 ret = i915_wait_request(dev, request->seqno, request->ring);
3407 if (ret != 0)
3408 break;
3409 }
3410 mutex_unlock(&dev->struct_mutex);
3411
3412 return ret;
3413}
3414
3415static int
3416i915_gem_get_relocs_from_user(struct drm_i915_gem_exec_object2 *exec_list,
3417 uint32_t buffer_count,
3418 struct drm_i915_gem_relocation_entry **relocs)
3419{
3420 uint32_t reloc_count = 0, reloc_index = 0, i;
3421 int ret;
3422
3423 *relocs = NULL;
3424 for (i = 0; i < buffer_count; i++) {
3425 if (reloc_count + exec_list[i].relocation_count < reloc_count)
3426 return -EINVAL;
3427 reloc_count += exec_list[i].relocation_count;
3428 }
3429
3430 *relocs = drm_calloc_large(reloc_count, sizeof(**relocs));
3431 if (*relocs == NULL) {
3432 DRM_ERROR("failed to alloc relocs, count %d\n", reloc_count);
3433 return -ENOMEM;
3434 }
3435
3436 for (i = 0; i < buffer_count; i++) {
3437 struct drm_i915_gem_relocation_entry __user *user_relocs;
3438
3439 user_relocs = (void __user *)(uintptr_t)exec_list[i].relocs_ptr;
3440
3441 ret = copy_from_user(&(*relocs)[reloc_index],
3442 user_relocs,
3443 exec_list[i].relocation_count *
3444 sizeof(**relocs));
3445 if (ret != 0) {
3446 drm_free_large(*relocs);
3447 *relocs = NULL;
3448 return -EFAULT;
3449 }
3450
3451 reloc_index += exec_list[i].relocation_count;
3452 }
3453
3454 return 0;
3455}
3456
3457static int
3458i915_gem_put_relocs_to_user(struct drm_i915_gem_exec_object2 *exec_list,
3459 uint32_t buffer_count,
3460 struct drm_i915_gem_relocation_entry *relocs)
3461{
3462 uint32_t reloc_count = 0, i;
3463 int ret = 0;
3464
3465 if (relocs == NULL)
3466 return 0;
3467
3468 for (i = 0; i < buffer_count; i++) {
3469 struct drm_i915_gem_relocation_entry __user *user_relocs;
3470 int unwritten;
3471
3472 user_relocs = (void __user *)(uintptr_t)exec_list[i].relocs_ptr;
3473
3474 unwritten = copy_to_user(user_relocs,
3475 &relocs[reloc_count],
3476 exec_list[i].relocation_count *
3477 sizeof(*relocs));
3478
3479 if (unwritten) {
3480 ret = -EFAULT;
3481 goto err;
3482 }
3483
3484 reloc_count += exec_list[i].relocation_count;
3485 }
3486
3487err:
3488 drm_free_large(relocs);
3489
3490 return ret;
3491}
3492
3493static int
3494i915_gem_check_execbuffer (struct drm_i915_gem_execbuffer2 *exec,
3495 uint64_t exec_offset)
3496{
3497 uint32_t exec_start, exec_len;
3498
3499 exec_start = (uint32_t) exec_offset + exec->batch_start_offset;
3500 exec_len = (uint32_t) exec->batch_len;
3501
3502 if ((exec_start | exec_len) & 0x7)
3503 return -EINVAL;
3504
3505 if (!exec_start)
3506 return -EINVAL;
3507
3508 return 0;
3509}
3510
3511static int
3512i915_gem_wait_for_pending_flip(struct drm_device *dev,
3513 struct drm_gem_object **object_list,
3514 int count)
3515{
3516 drm_i915_private_t *dev_priv = dev->dev_private;
3517 struct drm_i915_gem_object *obj_priv;
3518 DEFINE_WAIT(wait);
3519 int i, ret = 0;
3520
3521 for (;;) {
3522 prepare_to_wait(&dev_priv->pending_flip_queue,
3523 &wait, TASK_INTERRUPTIBLE);
3524 for (i = 0; i < count; i++) {
3525 obj_priv = to_intel_bo(object_list[i]);
3526 if (atomic_read(&obj_priv->pending_flip) > 0)
3527 break;
3528 }
3529 if (i == count)
3530 break;
3531
3532 if (!signal_pending(current)) {
3533 mutex_unlock(&dev->struct_mutex);
3534 schedule();
3535 mutex_lock(&dev->struct_mutex);
3536 continue;
3537 }
3538 ret = -ERESTARTSYS;
3539 break;
3540 }
3541 finish_wait(&dev_priv->pending_flip_queue, &wait);
3542
3543 return ret;
3544}
3545
3546
3547int
3548i915_gem_do_execbuffer(struct drm_device *dev, void *data,
3549 struct drm_file *file_priv,
3550 struct drm_i915_gem_execbuffer2 *args,
3551 struct drm_i915_gem_exec_object2 *exec_list)
3552{
3553 drm_i915_private_t *dev_priv = dev->dev_private;
3554 struct drm_gem_object **object_list = NULL;
3555 struct drm_gem_object *batch_obj;
3556 struct drm_i915_gem_object *obj_priv;
3557 struct drm_clip_rect *cliprects = NULL;
3558 struct drm_i915_gem_relocation_entry *relocs = NULL;
3559 int ret = 0, ret2, i, pinned = 0;
3560 uint64_t exec_offset;
3561 uint32_t seqno, flush_domains, reloc_index;
3562 int pin_tries, flips;
3563
3564 struct intel_ring_buffer *ring = NULL;
3565
3566#if WATCH_EXEC
3567 DRM_INFO("buffers_ptr %d buffer_count %d len %08x\n",
3568 (int) args->buffers_ptr, args->buffer_count, args->batch_len);
3569#endif
3570 if (args->flags & I915_EXEC_BSD) {
3571 if (!HAS_BSD(dev)) {
3572 DRM_ERROR("execbuf with wrong flag\n");
3573 return -EINVAL;
3574 }
3575 ring = &dev_priv->bsd_ring;
3576 } else {
3577 ring = &dev_priv->render_ring;
3578 }
3579
3580 if (args->buffer_count < 1) {
3581 DRM_ERROR("execbuf with %d buffers\n", args->buffer_count);
3582 return -EINVAL;
3583 }
3584 object_list = drm_malloc_ab(sizeof(*object_list), args->buffer_count);
3585 if (object_list == NULL) {
3586 DRM_ERROR("Failed to allocate object list for %d buffers\n",
3587 args->buffer_count);
3588 ret = -ENOMEM;
3589 goto pre_mutex_err;
3590 }
3591
3592 if (args->num_cliprects != 0) {
3593 cliprects = kcalloc(args->num_cliprects, sizeof(*cliprects),
3594 GFP_KERNEL);
3595 if (cliprects == NULL) {
3596 ret = -ENOMEM;
3597 goto pre_mutex_err;
3598 }
3599
3600 ret = copy_from_user(cliprects,
3601 (struct drm_clip_rect __user *)
3602 (uintptr_t) args->cliprects_ptr,
3603 sizeof(*cliprects) * args->num_cliprects);
3604 if (ret != 0) {
3605 DRM_ERROR("copy %d cliprects failed: %d\n",
3606 args->num_cliprects, ret);
3607 ret = -EFAULT;
3608 goto pre_mutex_err;
3609 }
3610 }
3611
3612 ret = i915_gem_get_relocs_from_user(exec_list, args->buffer_count,
3613 &relocs);
3614 if (ret != 0)
3615 goto pre_mutex_err;
3616
3617 mutex_lock(&dev->struct_mutex);
3618
3619 i915_verify_inactive(dev, __FILE__, __LINE__);
3620
3621 if (atomic_read(&dev_priv->mm.wedged)) {
3622 mutex_unlock(&dev->struct_mutex);
3623 ret = -EIO;
3624 goto pre_mutex_err;
3625 }
3626
3627 if (dev_priv->mm.suspended) {
3628 mutex_unlock(&dev->struct_mutex);
3629 ret = -EBUSY;
3630 goto pre_mutex_err;
3631 }
3632
3633 /* Look up object handles */
3634 flips = 0;
3635 for (i = 0; i < args->buffer_count; i++) {
3636 object_list[i] = drm_gem_object_lookup(dev, file_priv,
3637 exec_list[i].handle);
3638 if (object_list[i] == NULL) {
3639 DRM_ERROR("Invalid object handle %d at index %d\n",
3640 exec_list[i].handle, i);
3641 /* prevent error path from reading uninitialized data */
3642 args->buffer_count = i + 1;
3643 ret = -ENOENT;
3644 goto err;
3645 }
3646
3647 obj_priv = to_intel_bo(object_list[i]);
3648 if (obj_priv->in_execbuffer) {
3649 DRM_ERROR("Object %p appears more than once in object list\n",
3650 object_list[i]);
3651 /* prevent error path from reading uninitialized data */
3652 args->buffer_count = i + 1;
3653 ret = -EINVAL;
3654 goto err;
3655 }
3656 obj_priv->in_execbuffer = true;
3657 flips += atomic_read(&obj_priv->pending_flip);
3658 }
3659
3660 if (flips > 0) {
3661 ret = i915_gem_wait_for_pending_flip(dev, object_list,
3662 args->buffer_count);
3663 if (ret)
3664 goto err;
3665 }
3666
3667 /* Pin and relocate */
3668 for (pin_tries = 0; ; pin_tries++) {
3669 ret = 0;
3670 reloc_index = 0;
3671
3672 for (i = 0; i < args->buffer_count; i++) {
3673 object_list[i]->pending_read_domains = 0;
3674 object_list[i]->pending_write_domain = 0;
3675 ret = i915_gem_object_pin_and_relocate(object_list[i],
3676 file_priv,
3677 &exec_list[i],
3678 &relocs[reloc_index]);
3679 if (ret)
3680 break;
3681 pinned = i + 1;
3682 reloc_index += exec_list[i].relocation_count;
3683 }
3684 /* success */
3685 if (ret == 0)
3686 break;
3687
3688 /* error other than GTT full, or we've already tried again */
3689 if (ret != -ENOSPC || pin_tries >= 1) {
3690 if (ret != -ERESTARTSYS) {
3691 unsigned long long total_size = 0;
3692 int num_fences = 0;
3693 for (i = 0; i < args->buffer_count; i++) {
3694 obj_priv = to_intel_bo(object_list[i]);
3695
3696 total_size += object_list[i]->size;
3697 num_fences +=
3698 exec_list[i].flags & EXEC_OBJECT_NEEDS_FENCE &&
3699 obj_priv->tiling_mode != I915_TILING_NONE;
3700 }
3701 DRM_ERROR("Failed to pin buffer %d of %d, total %llu bytes, %d fences: %d\n",
3702 pinned+1, args->buffer_count,
3703 total_size, num_fences,
3704 ret);
3705 DRM_ERROR("%d objects [%d pinned], "
3706 "%d object bytes [%d pinned], "
3707 "%d/%d gtt bytes\n",
3708 atomic_read(&dev->object_count),
3709 atomic_read(&dev->pin_count),
3710 atomic_read(&dev->object_memory),
3711 atomic_read(&dev->pin_memory),
3712 atomic_read(&dev->gtt_memory),
3713 dev->gtt_total);
3714 }
3715 goto err;
3716 }
3717
3718 /* unpin all of our buffers */
3719 for (i = 0; i < pinned; i++)
3720 i915_gem_object_unpin(object_list[i]);
3721 pinned = 0;
3722
3723 /* evict everyone we can from the aperture */
3724 ret = i915_gem_evict_everything(dev);
3725 if (ret && ret != -ENOSPC)
3726 goto err;
3727 }
3728
3729 /* Set the pending read domains for the batch buffer to COMMAND */
3730 batch_obj = object_list[args->buffer_count-1];
3731 if (batch_obj->pending_write_domain) {
3732 DRM_ERROR("Attempting to use self-modifying batch buffer\n");
3733 ret = -EINVAL;
3734 goto err;
3735 }
3736 batch_obj->pending_read_domains |= I915_GEM_DOMAIN_COMMAND;
3737
3738 /* Sanity check the batch buffer, prior to moving objects */
3739 exec_offset = exec_list[args->buffer_count - 1].offset;
3740 ret = i915_gem_check_execbuffer (args, exec_offset);
3741 if (ret != 0) {
3742 DRM_ERROR("execbuf with invalid offset/length\n");
3743 goto err;
3744 }
3745
3746 i915_verify_inactive(dev, __FILE__, __LINE__);
3747
3748 /* Zero the global flush/invalidate flags. These
3749 * will be modified as new domains are computed
3750 * for each object
3751 */
3752 dev->invalidate_domains = 0;
3753 dev->flush_domains = 0;
3754 dev_priv->flush_rings = 0;
3755
3756 for (i = 0; i < args->buffer_count; i++) {
3757 struct drm_gem_object *obj = object_list[i];
3758
3759 /* Compute new gpu domains and update invalidate/flush */
3760 i915_gem_object_set_to_gpu_domain(obj);
3761 }
3762
3763 i915_verify_inactive(dev, __FILE__, __LINE__);
3764
3765 if (dev->invalidate_domains | dev->flush_domains) {
3766#if WATCH_EXEC
3767 DRM_INFO("%s: invalidate_domains %08x flush_domains %08x\n",
3768 __func__,
3769 dev->invalidate_domains,
3770 dev->flush_domains);
3771#endif
3772 i915_gem_flush(dev,
3773 dev->invalidate_domains,
3774 dev->flush_domains);
3775 if (dev_priv->flush_rings & FLUSH_RENDER_RING)
3776 (void)i915_add_request(dev, file_priv,
3777 dev->flush_domains,
3778 &dev_priv->render_ring);
3779 if (dev_priv->flush_rings & FLUSH_BSD_RING)
3780 (void)i915_add_request(dev, file_priv,
3781 dev->flush_domains,
3782 &dev_priv->bsd_ring);
3783 }
3784
3785 for (i = 0; i < args->buffer_count; i++) {
3786 struct drm_gem_object *obj = object_list[i];
3787 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
3788 uint32_t old_write_domain = obj->write_domain;
3789
3790 obj->write_domain = obj->pending_write_domain;
3791 if (obj->write_domain)
3792 list_move_tail(&obj_priv->gpu_write_list,
3793 &dev_priv->mm.gpu_write_list);
3794 else
3795 list_del_init(&obj_priv->gpu_write_list);
3796
3797 trace_i915_gem_object_change_domain(obj,
3798 obj->read_domains,
3799 old_write_domain);
3800 }
3801
3802 i915_verify_inactive(dev, __FILE__, __LINE__);
3803
3804#if WATCH_COHERENCY
3805 for (i = 0; i < args->buffer_count; i++) {
3806 i915_gem_object_check_coherency(object_list[i],
3807 exec_list[i].handle);
3808 }
3809#endif
3810
3811#if WATCH_EXEC
3812 i915_gem_dump_object(batch_obj,
3813 args->batch_len,
3814 __func__,
3815 ~0);
3816#endif
3817
3818 /* Exec the batchbuffer */
3819 ret = ring->dispatch_gem_execbuffer(dev, ring, args,
3820 cliprects, exec_offset);
3821 if (ret) {
3822 DRM_ERROR("dispatch failed %d\n", ret);
3823 goto err;
3824 }
3825
3826 /*
3827 * Ensure that the commands in the batch buffer are
3828 * finished before the interrupt fires
3829 */
3830 flush_domains = i915_retire_commands(dev, ring);
3831
3832 i915_verify_inactive(dev, __FILE__, __LINE__);
3833
3834 /*
3835 * Get a seqno representing the execution of the current buffer,
3836 * which we can wait on. We would like to mitigate these interrupts,
3837 * likely by only creating seqnos occasionally (so that we have
3838 * *some* interrupts representing completion of buffers that we can
3839 * wait on when trying to clear up gtt space).
3840 */
3841 seqno = i915_add_request(dev, file_priv, flush_domains, ring);
3842 BUG_ON(seqno == 0);
3843 for (i = 0; i < args->buffer_count; i++) {
3844 struct drm_gem_object *obj = object_list[i];
3845 obj_priv = to_intel_bo(obj);
3846
3847 i915_gem_object_move_to_active(obj, seqno, ring);
3848#if WATCH_LRU
3849 DRM_INFO("%s: move to exec list %p\n", __func__, obj);
3850#endif
3851 }
3852#if WATCH_LRU
3853 i915_dump_lru(dev, __func__);
3854#endif
3855
3856 i915_verify_inactive(dev, __FILE__, __LINE__);
3857
3858err:
3859 for (i = 0; i < pinned; i++)
3860 i915_gem_object_unpin(object_list[i]);
3861
3862 for (i = 0; i < args->buffer_count; i++) {
3863 if (object_list[i]) {
3864 obj_priv = to_intel_bo(object_list[i]);
3865 obj_priv->in_execbuffer = false;
3866 }
3867 drm_gem_object_unreference(object_list[i]);
3868 }
3869
3870 mutex_unlock(&dev->struct_mutex);
3871
3872pre_mutex_err:
3873 /* Copy the updated relocations out regardless of current error
3874 * state. Failure to update the relocs would mean that the next
3875 * time userland calls execbuf, it would do so with presumed offset
3876 * state that didn't match the actual object state.
3877 */
3878 ret2 = i915_gem_put_relocs_to_user(exec_list, args->buffer_count,
3879 relocs);
3880 if (ret2 != 0) {
3881 DRM_ERROR("Failed to copy relocations back out: %d\n", ret2);
3882
3883 if (ret == 0)
3884 ret = ret2;
3885 }
3886
3887 drm_free_large(object_list);
3888 kfree(cliprects);
3889
3890 return ret;
3891}
3892
3893/*
3894 * Legacy execbuffer just creates an exec2 list from the original exec object
3895 * list array and passes it to the real function.
3896 */
3897int
3898i915_gem_execbuffer(struct drm_device *dev, void *data,
3899 struct drm_file *file_priv)
3900{
3901 struct drm_i915_gem_execbuffer *args = data;
3902 struct drm_i915_gem_execbuffer2 exec2;
3903 struct drm_i915_gem_exec_object *exec_list = NULL;
3904 struct drm_i915_gem_exec_object2 *exec2_list = NULL;
3905 int ret, i;
3906
3907#if WATCH_EXEC
3908 DRM_INFO("buffers_ptr %d buffer_count %d len %08x\n",
3909 (int) args->buffers_ptr, args->buffer_count, args->batch_len);
3910#endif
3911
3912 if (args->buffer_count < 1) {
3913 DRM_ERROR("execbuf with %d buffers\n", args->buffer_count);
3914 return -EINVAL;
3915 }
3916
3917 /* Copy in the exec list from userland */
3918 exec_list = drm_malloc_ab(sizeof(*exec_list), args->buffer_count);
3919 exec2_list = drm_malloc_ab(sizeof(*exec2_list), args->buffer_count);
3920 if (exec_list == NULL || exec2_list == NULL) {
3921 DRM_ERROR("Failed to allocate exec list for %d buffers\n",
3922 args->buffer_count);
3923 drm_free_large(exec_list);
3924 drm_free_large(exec2_list);
3925 return -ENOMEM;
3926 }
3927 ret = copy_from_user(exec_list,
3928 (struct drm_i915_relocation_entry __user *)
3929 (uintptr_t) args->buffers_ptr,
3930 sizeof(*exec_list) * args->buffer_count);
3931 if (ret != 0) {
3932 DRM_ERROR("copy %d exec entries failed %d\n",
3933 args->buffer_count, ret);
3934 drm_free_large(exec_list);
3935 drm_free_large(exec2_list);
3936 return -EFAULT;
3937 }
3938
3939 for (i = 0; i < args->buffer_count; i++) {
3940 exec2_list[i].handle = exec_list[i].handle;
3941 exec2_list[i].relocation_count = exec_list[i].relocation_count;
3942 exec2_list[i].relocs_ptr = exec_list[i].relocs_ptr;
3943 exec2_list[i].alignment = exec_list[i].alignment;
3944 exec2_list[i].offset = exec_list[i].offset;
3945 if (!IS_I965G(dev))
3946 exec2_list[i].flags = EXEC_OBJECT_NEEDS_FENCE;
3947 else
3948 exec2_list[i].flags = 0;
3949 }
3950
3951 exec2.buffers_ptr = args->buffers_ptr;
3952 exec2.buffer_count = args->buffer_count;
3953 exec2.batch_start_offset = args->batch_start_offset;
3954 exec2.batch_len = args->batch_len;
3955 exec2.DR1 = args->DR1;
3956 exec2.DR4 = args->DR4;
3957 exec2.num_cliprects = args->num_cliprects;
3958 exec2.cliprects_ptr = args->cliprects_ptr;
3959 exec2.flags = I915_EXEC_RENDER;
3960
3961 ret = i915_gem_do_execbuffer(dev, data, file_priv, &exec2, exec2_list);
3962 if (!ret) {
3963 /* Copy the new buffer offsets back to the user's exec list. */
3964 for (i = 0; i < args->buffer_count; i++)
3965 exec_list[i].offset = exec2_list[i].offset;
3966 /* ... and back out to userspace */
3967 ret = copy_to_user((struct drm_i915_relocation_entry __user *)
3968 (uintptr_t) args->buffers_ptr,
3969 exec_list,
3970 sizeof(*exec_list) * args->buffer_count);
3971 if (ret) {
3972 ret = -EFAULT;
3973 DRM_ERROR("failed to copy %d exec entries "
3974 "back to user (%d)\n",
3975 args->buffer_count, ret);
3976 }
3977 }
3978
3979 drm_free_large(exec_list);
3980 drm_free_large(exec2_list);
3981 return ret;
3982}
3983
3984int
3985i915_gem_execbuffer2(struct drm_device *dev, void *data,
3986 struct drm_file *file_priv)
3987{
3988 struct drm_i915_gem_execbuffer2 *args = data;
3989 struct drm_i915_gem_exec_object2 *exec2_list = NULL;
3990 int ret;
3991
3992#if WATCH_EXEC
3993 DRM_INFO("buffers_ptr %d buffer_count %d len %08x\n",
3994 (int) args->buffers_ptr, args->buffer_count, args->batch_len);
3995#endif
3996
3997 if (args->buffer_count < 1) {
3998 DRM_ERROR("execbuf2 with %d buffers\n", args->buffer_count);
3999 return -EINVAL;
4000 }
4001
4002 exec2_list = drm_malloc_ab(sizeof(*exec2_list), args->buffer_count);
4003 if (exec2_list == NULL) {
4004 DRM_ERROR("Failed to allocate exec list for %d buffers\n",
4005 args->buffer_count);
4006 return -ENOMEM;
4007 }
4008 ret = copy_from_user(exec2_list,
4009 (struct drm_i915_relocation_entry __user *)
4010 (uintptr_t) args->buffers_ptr,
4011 sizeof(*exec2_list) * args->buffer_count);
4012 if (ret != 0) {
4013 DRM_ERROR("copy %d exec entries failed %d\n",
4014 args->buffer_count, ret);
4015 drm_free_large(exec2_list);
4016 return -EFAULT;
4017 }
4018
4019 ret = i915_gem_do_execbuffer(dev, data, file_priv, args, exec2_list);
4020 if (!ret) {
4021 /* Copy the new buffer offsets back to the user's exec list. */
4022 ret = copy_to_user((struct drm_i915_relocation_entry __user *)
4023 (uintptr_t) args->buffers_ptr,
4024 exec2_list,
4025 sizeof(*exec2_list) * args->buffer_count);
4026 if (ret) {
4027 ret = -EFAULT;
4028 DRM_ERROR("failed to copy %d exec entries "
4029 "back to user (%d)\n",
4030 args->buffer_count, ret);
4031 }
4032 }
4033
4034 drm_free_large(exec2_list);
4035 return ret;
4036}
4037
4038int
4039i915_gem_object_pin(struct drm_gem_object *obj, uint32_t alignment)
4040{
4041 struct drm_device *dev = obj->dev;
4042 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
4043 int ret;
4044
4045 BUG_ON(obj_priv->pin_count == DRM_I915_GEM_OBJECT_MAX_PIN_COUNT);
4046
4047 i915_verify_inactive(dev, __FILE__, __LINE__);
4048
4049 if (obj_priv->gtt_space != NULL) {
4050 if (alignment == 0)
4051 alignment = i915_gem_get_gtt_alignment(obj);
4052 if (obj_priv->gtt_offset & (alignment - 1)) {
4053 WARN(obj_priv->pin_count,
4054 "bo is already pinned with incorrect alignment:"
4055 " offset=%x, req.alignment=%x\n",
4056 obj_priv->gtt_offset, alignment);
4057 ret = i915_gem_object_unbind(obj);
4058 if (ret)
4059 return ret;
4060 }
4061 }
4062
4063 if (obj_priv->gtt_space == NULL) {
4064 ret = i915_gem_object_bind_to_gtt(obj, alignment);
4065 if (ret)
4066 return ret;
4067 }
4068
4069 obj_priv->pin_count++;
4070
4071 /* If the object is not active and not pending a flush,
4072 * remove it from the inactive list
4073 */
4074 if (obj_priv->pin_count == 1) {
4075 atomic_inc(&dev->pin_count);
4076 atomic_add(obj->size, &dev->pin_memory);
4077 if (!obj_priv->active &&
4078 (obj->write_domain & I915_GEM_GPU_DOMAINS) == 0)
4079 list_del_init(&obj_priv->list);
4080 }
4081 i915_verify_inactive(dev, __FILE__, __LINE__);
4082
4083 return 0;
4084}
4085
4086void
4087i915_gem_object_unpin(struct drm_gem_object *obj)
4088{
4089 struct drm_device *dev = obj->dev;
4090 drm_i915_private_t *dev_priv = dev->dev_private;
4091 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
4092
4093 i915_verify_inactive(dev, __FILE__, __LINE__);
4094 obj_priv->pin_count--;
4095 BUG_ON(obj_priv->pin_count < 0);
4096 BUG_ON(obj_priv->gtt_space == NULL);
4097
4098 /* If the object is no longer pinned, and is
4099 * neither active nor being flushed, then stick it on
4100 * the inactive list
4101 */
4102 if (obj_priv->pin_count == 0) {
4103 if (!obj_priv->active &&
4104 (obj->write_domain & I915_GEM_GPU_DOMAINS) == 0)
4105 list_move_tail(&obj_priv->list,
4106 &dev_priv->mm.inactive_list);
4107 atomic_dec(&dev->pin_count);
4108 atomic_sub(obj->size, &dev->pin_memory);
4109 }
4110 i915_verify_inactive(dev, __FILE__, __LINE__);
4111}
4112
4113int
4114i915_gem_pin_ioctl(struct drm_device *dev, void *data,
4115 struct drm_file *file_priv)
4116{
4117 struct drm_i915_gem_pin *args = data;
4118 struct drm_gem_object *obj;
4119 struct drm_i915_gem_object *obj_priv;
4120 int ret;
4121
4122 mutex_lock(&dev->struct_mutex);
4123
4124 obj = drm_gem_object_lookup(dev, file_priv, args->handle);
4125 if (obj == NULL) {
4126 DRM_ERROR("Bad handle in i915_gem_pin_ioctl(): %d\n",
4127 args->handle);
4128 mutex_unlock(&dev->struct_mutex);
4129 return -ENOENT;
4130 }
4131 obj_priv = to_intel_bo(obj);
4132
4133 if (obj_priv->madv != I915_MADV_WILLNEED) {
4134 DRM_ERROR("Attempting to pin a purgeable buffer\n");
4135 drm_gem_object_unreference(obj);
4136 mutex_unlock(&dev->struct_mutex);
4137 return -EINVAL;
4138 }
4139
4140 if (obj_priv->pin_filp != NULL && obj_priv->pin_filp != file_priv) {
4141 DRM_ERROR("Already pinned in i915_gem_pin_ioctl(): %d\n",
4142 args->handle);
4143 drm_gem_object_unreference(obj);
4144 mutex_unlock(&dev->struct_mutex);
4145 return -EINVAL;
4146 }
4147
4148 obj_priv->user_pin_count++;
4149 obj_priv->pin_filp = file_priv;
4150 if (obj_priv->user_pin_count == 1) {
4151 ret = i915_gem_object_pin(obj, args->alignment);
4152 if (ret != 0) {
4153 drm_gem_object_unreference(obj);
4154 mutex_unlock(&dev->struct_mutex);
4155 return ret;
4156 }
4157 }
4158
4159 /* XXX - flush the CPU caches for pinned objects
4160 * as the X server doesn't manage domains yet
4161 */
4162 i915_gem_object_flush_cpu_write_domain(obj);
4163 args->offset = obj_priv->gtt_offset;
4164 drm_gem_object_unreference(obj);
4165 mutex_unlock(&dev->struct_mutex);
4166
4167 return 0;
4168}
4169
4170int
4171i915_gem_unpin_ioctl(struct drm_device *dev, void *data,
4172 struct drm_file *file_priv)
4173{
4174 struct drm_i915_gem_pin *args = data;
4175 struct drm_gem_object *obj;
4176 struct drm_i915_gem_object *obj_priv;
4177
4178 mutex_lock(&dev->struct_mutex);
4179
4180 obj = drm_gem_object_lookup(dev, file_priv, args->handle);
4181 if (obj == NULL) {
4182 DRM_ERROR("Bad handle in i915_gem_unpin_ioctl(): %d\n",
4183 args->handle);
4184 mutex_unlock(&dev->struct_mutex);
4185 return -ENOENT;
4186 }
4187
4188 obj_priv = to_intel_bo(obj);
4189 if (obj_priv->pin_filp != file_priv) {
4190 DRM_ERROR("Not pinned by caller in i915_gem_pin_ioctl(): %d\n",
4191 args->handle);
4192 drm_gem_object_unreference(obj);
4193 mutex_unlock(&dev->struct_mutex);
4194 return -EINVAL;
4195 }
4196 obj_priv->user_pin_count--;
4197 if (obj_priv->user_pin_count == 0) {
4198 obj_priv->pin_filp = NULL;
4199 i915_gem_object_unpin(obj);
4200 }
4201
4202 drm_gem_object_unreference(obj);
4203 mutex_unlock(&dev->struct_mutex);
4204 return 0;
4205}
4206
4207int
4208i915_gem_busy_ioctl(struct drm_device *dev, void *data,
4209 struct drm_file *file_priv)
4210{
4211 struct drm_i915_gem_busy *args = data;
4212 struct drm_gem_object *obj;
4213 struct drm_i915_gem_object *obj_priv;
4214
4215 obj = drm_gem_object_lookup(dev, file_priv, args->handle);
4216 if (obj == NULL) {
4217 DRM_ERROR("Bad handle in i915_gem_busy_ioctl(): %d\n",
4218 args->handle);
4219 return -ENOENT;
4220 }
4221
4222 mutex_lock(&dev->struct_mutex);
4223
4224 /* Count all active objects as busy, even if they are currently not used
4225 * by the gpu. Users of this interface expect objects to eventually
4226 * become non-busy without any further actions, therefore emit any
4227 * necessary flushes here.
4228 */
4229 obj_priv = to_intel_bo(obj);
4230 args->busy = obj_priv->active;
4231 if (args->busy) {
4232 /* Unconditionally flush objects, even when the gpu still uses this
4233 * object. Userspace calling this function indicates that it wants to
4234 * use this buffer rather sooner than later, so issuing the required
4235 * flush earlier is beneficial.
4236 */
4237 if (obj->write_domain) {
4238 i915_gem_flush(dev, 0, obj->write_domain);
4239 (void)i915_add_request(dev, file_priv, obj->write_domain, obj_priv->ring);
4240 }
4241
4242 /* Update the active list for the hardware's current position.
4243 * Otherwise this only updates on a delayed timer or when irqs
4244 * are actually unmasked, and our working set ends up being
4245 * larger than required.
4246 */
4247 i915_gem_retire_requests_ring(dev, obj_priv->ring);
4248
4249 args->busy = obj_priv->active;
4250 }
4251
4252 drm_gem_object_unreference(obj);
4253 mutex_unlock(&dev->struct_mutex);
4254 return 0;
4255}
4256
4257int
4258i915_gem_throttle_ioctl(struct drm_device *dev, void *data,
4259 struct drm_file *file_priv)
4260{
4261 return i915_gem_ring_throttle(dev, file_priv);
4262}
4263
4264int
4265i915_gem_madvise_ioctl(struct drm_device *dev, void *data,
4266 struct drm_file *file_priv)
4267{
4268 struct drm_i915_gem_madvise *args = data;
4269 struct drm_gem_object *obj;
4270 struct drm_i915_gem_object *obj_priv;
4271
4272 switch (args->madv) {
4273 case I915_MADV_DONTNEED:
4274 case I915_MADV_WILLNEED:
4275 break;
4276 default:
4277 return -EINVAL;
4278 }
4279
4280 obj = drm_gem_object_lookup(dev, file_priv, args->handle);
4281 if (obj == NULL) {
4282 DRM_ERROR("Bad handle in i915_gem_madvise_ioctl(): %d\n",
4283 args->handle);
4284 return -ENOENT;
4285 }
4286
4287 mutex_lock(&dev->struct_mutex);
4288 obj_priv = to_intel_bo(obj);
4289
4290 if (obj_priv->pin_count) {
4291 drm_gem_object_unreference(obj);
4292 mutex_unlock(&dev->struct_mutex);
4293
4294 DRM_ERROR("Attempted i915_gem_madvise_ioctl() on a pinned object\n");
4295 return -EINVAL;
4296 }
4297
4298 if (obj_priv->madv != __I915_MADV_PURGED)
4299 obj_priv->madv = args->madv;
4300
4301 /* if the object is no longer bound, discard its backing storage */
4302 if (i915_gem_object_is_purgeable(obj_priv) &&
4303 obj_priv->gtt_space == NULL)
4304 i915_gem_object_truncate(obj);
4305
4306 args->retained = obj_priv->madv != __I915_MADV_PURGED;
4307
4308 drm_gem_object_unreference(obj);
4309 mutex_unlock(&dev->struct_mutex);
4310
4311 return 0;
4312}
4313
4314struct drm_gem_object * i915_gem_alloc_object(struct drm_device *dev,
4315 size_t size)
4316{
4317 struct drm_i915_gem_object *obj;
4318
4319 obj = kzalloc(sizeof(*obj), GFP_KERNEL);
4320 if (obj == NULL)
4321 return NULL;
4322
4323 if (drm_gem_object_init(dev, &obj->base, size) != 0) {
4324 kfree(obj);
4325 return NULL;
4326 }
4327
4328 obj->base.write_domain = I915_GEM_DOMAIN_CPU;
4329 obj->base.read_domains = I915_GEM_DOMAIN_CPU;
4330
4331 obj->agp_type = AGP_USER_MEMORY;
4332 obj->base.driver_private = NULL;
4333 obj->fence_reg = I915_FENCE_REG_NONE;
4334 INIT_LIST_HEAD(&obj->list);
4335 INIT_LIST_HEAD(&obj->gpu_write_list);
4336 obj->madv = I915_MADV_WILLNEED;
4337
4338 trace_i915_gem_object_create(&obj->base);
4339
4340 return &obj->base;
4341}
4342
4343int i915_gem_init_object(struct drm_gem_object *obj)
4344{
4345 BUG();
4346
4347 return 0;
4348}
4349
4350static void i915_gem_free_object_tail(struct drm_gem_object *obj)
4351{
4352 struct drm_device *dev = obj->dev;
4353 drm_i915_private_t *dev_priv = dev->dev_private;
4354 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
4355 int ret;
4356
4357 ret = i915_gem_object_unbind(obj);
4358 if (ret == -ERESTARTSYS) {
4359 list_move(&obj_priv->list,
4360 &dev_priv->mm.deferred_free_list);
4361 return;
4362 }
4363
4364 if (obj_priv->mmap_offset)
4365 i915_gem_free_mmap_offset(obj);
4366
4367 drm_gem_object_release(obj);
4368
4369 kfree(obj_priv->page_cpu_valid);
4370 kfree(obj_priv->bit_17);
4371 kfree(obj_priv);
4372}
4373
4374void i915_gem_free_object(struct drm_gem_object *obj)
4375{
4376 struct drm_device *dev = obj->dev;
4377 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
4378
4379 trace_i915_gem_object_destroy(obj);
4380
4381 while (obj_priv->pin_count > 0)
4382 i915_gem_object_unpin(obj);
4383
4384 if (obj_priv->phys_obj)
4385 i915_gem_detach_phys_object(dev, obj);
4386
4387 i915_gem_free_object_tail(obj);
4388}
4389
4390int
4391i915_gem_idle(struct drm_device *dev)
4392{
4393 drm_i915_private_t *dev_priv = dev->dev_private;
4394 int ret;
4395
4396 mutex_lock(&dev->struct_mutex);
4397
4398 if (dev_priv->mm.suspended ||
4399 (dev_priv->render_ring.gem_object == NULL) ||
4400 (HAS_BSD(dev) &&
4401 dev_priv->bsd_ring.gem_object == NULL)) {
4402 mutex_unlock(&dev->struct_mutex);
4403 return 0;
4404 }
4405
4406 ret = i915_gpu_idle(dev);
4407 if (ret) {
4408 mutex_unlock(&dev->struct_mutex);
4409 return ret;
4410 }
4411
4412 /* Under UMS, be paranoid and evict. */
4413 if (!drm_core_check_feature(dev, DRIVER_MODESET)) {
4414 ret = i915_gem_evict_inactive(dev);
4415 if (ret) {
4416 mutex_unlock(&dev->struct_mutex);
4417 return ret;
4418 }
4419 }
4420
4421 /* Hack! Don't let anybody do execbuf while we don't control the chip.
4422 * We need to replace this with a semaphore, or something.
4423 * And not confound mm.suspended!
4424 */
4425 dev_priv->mm.suspended = 1;
4426 del_timer(&dev_priv->hangcheck_timer);
4427
4428 i915_kernel_lost_context(dev);
4429 i915_gem_cleanup_ringbuffer(dev);
4430
4431 mutex_unlock(&dev->struct_mutex);
4432
4433 /* Cancel the retire work handler, which should be idle now. */
4434 cancel_delayed_work_sync(&dev_priv->mm.retire_work);
4435
4436 return 0;
4437}
4438
4439/*
4440 * 965+ support PIPE_CONTROL commands, which provide finer grained control
4441 * over cache flushing.
4442 */
4443static int
4444i915_gem_init_pipe_control(struct drm_device *dev)
4445{
4446 drm_i915_private_t *dev_priv = dev->dev_private;
4447 struct drm_gem_object *obj;
4448 struct drm_i915_gem_object *obj_priv;
4449 int ret;
4450
4451 obj = i915_gem_alloc_object(dev, 4096);
4452 if (obj == NULL) {
4453 DRM_ERROR("Failed to allocate seqno page\n");
4454 ret = -ENOMEM;
4455 goto err;
4456 }
4457 obj_priv = to_intel_bo(obj);
4458 obj_priv->agp_type = AGP_USER_CACHED_MEMORY;
4459
4460 ret = i915_gem_object_pin(obj, 4096);
4461 if (ret)
4462 goto err_unref;
4463
4464 dev_priv->seqno_gfx_addr = obj_priv->gtt_offset;
4465 dev_priv->seqno_page = kmap(obj_priv->pages[0]);
4466 if (dev_priv->seqno_page == NULL)
4467 goto err_unpin;
4468
4469 dev_priv->seqno_obj = obj;
4470 memset(dev_priv->seqno_page, 0, PAGE_SIZE);
4471
4472 return 0;
4473
4474err_unpin:
4475 i915_gem_object_unpin(obj);
4476err_unref:
4477 drm_gem_object_unreference(obj);
4478err:
4479 return ret;
4480}
4481
4482
4483static void
4484i915_gem_cleanup_pipe_control(struct drm_device *dev)
4485{
4486 drm_i915_private_t *dev_priv = dev->dev_private;
4487 struct drm_gem_object *obj;
4488 struct drm_i915_gem_object *obj_priv;
4489
4490 obj = dev_priv->seqno_obj;
4491 obj_priv = to_intel_bo(obj);
4492 kunmap(obj_priv->pages[0]);
4493 i915_gem_object_unpin(obj);
4494 drm_gem_object_unreference(obj);
4495 dev_priv->seqno_obj = NULL;
4496
4497 dev_priv->seqno_page = NULL;
4498}
4499
4500int
4501i915_gem_init_ringbuffer(struct drm_device *dev)
4502{
4503 drm_i915_private_t *dev_priv = dev->dev_private;
4504 int ret;
4505
4506 dev_priv->render_ring = render_ring;
4507
4508 if (!I915_NEED_GFX_HWS(dev)) {
4509 dev_priv->render_ring.status_page.page_addr
4510 = dev_priv->status_page_dmah->vaddr;
4511 memset(dev_priv->render_ring.status_page.page_addr,
4512 0, PAGE_SIZE);
4513 }
4514
4515 if (HAS_PIPE_CONTROL(dev)) {
4516 ret = i915_gem_init_pipe_control(dev);
4517 if (ret)
4518 return ret;
4519 }
4520
4521 ret = intel_init_ring_buffer(dev, &dev_priv->render_ring);
4522 if (ret)
4523 goto cleanup_pipe_control;
4524
4525 if (HAS_BSD(dev)) {
4526 dev_priv->bsd_ring = bsd_ring;
4527 ret = intel_init_ring_buffer(dev, &dev_priv->bsd_ring);
4528 if (ret)
4529 goto cleanup_render_ring;
4530 }
4531
4532 dev_priv->next_seqno = 1;
4533
4534 return 0;
4535
4536cleanup_render_ring:
4537 intel_cleanup_ring_buffer(dev, &dev_priv->render_ring);
4538cleanup_pipe_control:
4539 if (HAS_PIPE_CONTROL(dev))
4540 i915_gem_cleanup_pipe_control(dev);
4541 return ret;
4542}
4543
4544void
4545i915_gem_cleanup_ringbuffer(struct drm_device *dev)
4546{
4547 drm_i915_private_t *dev_priv = dev->dev_private;
4548
4549 intel_cleanup_ring_buffer(dev, &dev_priv->render_ring);
4550 if (HAS_BSD(dev))
4551 intel_cleanup_ring_buffer(dev, &dev_priv->bsd_ring);
4552 if (HAS_PIPE_CONTROL(dev))
4553 i915_gem_cleanup_pipe_control(dev);
4554}
4555
4556int
4557i915_gem_entervt_ioctl(struct drm_device *dev, void *data,
4558 struct drm_file *file_priv)
4559{
4560 drm_i915_private_t *dev_priv = dev->dev_private;
4561 int ret;
4562
4563 if (drm_core_check_feature(dev, DRIVER_MODESET))
4564 return 0;
4565
4566 if (atomic_read(&dev_priv->mm.wedged)) {
4567 DRM_ERROR("Reenabling wedged hardware, good luck\n");
4568 atomic_set(&dev_priv->mm.wedged, 0);
4569 }
4570
4571 mutex_lock(&dev->struct_mutex);
4572 dev_priv->mm.suspended = 0;
4573
4574 ret = i915_gem_init_ringbuffer(dev);
4575 if (ret != 0) {
4576 mutex_unlock(&dev->struct_mutex);
4577 return ret;
4578 }
4579
4580 spin_lock(&dev_priv->mm.active_list_lock);
4581 BUG_ON(!list_empty(&dev_priv->render_ring.active_list));
4582 BUG_ON(HAS_BSD(dev) && !list_empty(&dev_priv->bsd_ring.active_list));
4583 spin_unlock(&dev_priv->mm.active_list_lock);
4584
4585 BUG_ON(!list_empty(&dev_priv->mm.flushing_list));
4586 BUG_ON(!list_empty(&dev_priv->mm.inactive_list));
4587 BUG_ON(!list_empty(&dev_priv->render_ring.request_list));
4588 BUG_ON(HAS_BSD(dev) && !list_empty(&dev_priv->bsd_ring.request_list));
4589 mutex_unlock(&dev->struct_mutex);
4590
4591 ret = drm_irq_install(dev);
4592 if (ret)
4593 goto cleanup_ringbuffer;
4594
4595 return 0;
4596
4597cleanup_ringbuffer:
4598 mutex_lock(&dev->struct_mutex);
4599 i915_gem_cleanup_ringbuffer(dev);
4600 dev_priv->mm.suspended = 1;
4601 mutex_unlock(&dev->struct_mutex);
4602
4603 return ret;
4604}
4605
4606int
4607i915_gem_leavevt_ioctl(struct drm_device *dev, void *data,
4608 struct drm_file *file_priv)
4609{
4610 if (drm_core_check_feature(dev, DRIVER_MODESET))
4611 return 0;
4612
4613 drm_irq_uninstall(dev);
4614 return i915_gem_idle(dev);
4615}
4616
4617void
4618i915_gem_lastclose(struct drm_device *dev)
4619{
4620 int ret;
4621
4622 if (drm_core_check_feature(dev, DRIVER_MODESET))
4623 return;
4624
4625 ret = i915_gem_idle(dev);
4626 if (ret)
4627 DRM_ERROR("failed to idle hardware: %d\n", ret);
4628}
4629
4630void
4631i915_gem_load(struct drm_device *dev)
4632{
4633 int i;
4634 drm_i915_private_t *dev_priv = dev->dev_private;
4635
4636 spin_lock_init(&dev_priv->mm.active_list_lock);
4637 INIT_LIST_HEAD(&dev_priv->mm.flushing_list);
4638 INIT_LIST_HEAD(&dev_priv->mm.gpu_write_list);
4639 INIT_LIST_HEAD(&dev_priv->mm.inactive_list);
4640 INIT_LIST_HEAD(&dev_priv->mm.fence_list);
4641 INIT_LIST_HEAD(&dev_priv->mm.deferred_free_list);
4642 INIT_LIST_HEAD(&dev_priv->render_ring.active_list);
4643 INIT_LIST_HEAD(&dev_priv->render_ring.request_list);
4644 if (HAS_BSD(dev)) {
4645 INIT_LIST_HEAD(&dev_priv->bsd_ring.active_list);
4646 INIT_LIST_HEAD(&dev_priv->bsd_ring.request_list);
4647 }
4648 for (i = 0; i < 16; i++)
4649 INIT_LIST_HEAD(&dev_priv->fence_regs[i].lru_list);
4650 INIT_DELAYED_WORK(&dev_priv->mm.retire_work,
4651 i915_gem_retire_work_handler);
4652 spin_lock(&shrink_list_lock);
4653 list_add(&dev_priv->mm.shrink_list, &shrink_list);
4654 spin_unlock(&shrink_list_lock);
4655
4656 /* On GEN3 we really need to make sure the ARB C3 LP bit is set */
4657 if (IS_GEN3(dev)) {
4658 u32 tmp = I915_READ(MI_ARB_STATE);
4659 if (!(tmp & MI_ARB_C3_LP_WRITE_ENABLE)) {
4660 /* arb state is a masked write, so set bit + bit in mask */
4661 tmp = MI_ARB_C3_LP_WRITE_ENABLE | (MI_ARB_C3_LP_WRITE_ENABLE << MI_ARB_MASK_SHIFT);
4662 I915_WRITE(MI_ARB_STATE, tmp);
4663 }
4664 }
4665
4666 /* Old X drivers will take 0-2 for front, back, depth buffers */
4667 if (!drm_core_check_feature(dev, DRIVER_MODESET))
4668 dev_priv->fence_reg_start = 3;
4669
4670 if (IS_I965G(dev) || IS_I945G(dev) || IS_I945GM(dev) || IS_G33(dev))
4671 dev_priv->num_fence_regs = 16;
4672 else
4673 dev_priv->num_fence_regs = 8;
4674
4675 /* Initialize fence registers to zero */
4676 if (IS_I965G(dev)) {
4677 for (i = 0; i < 16; i++)
4678 I915_WRITE64(FENCE_REG_965_0 + (i * 8), 0);
4679 } else {
4680 for (i = 0; i < 8; i++)
4681 I915_WRITE(FENCE_REG_830_0 + (i * 4), 0);
4682 if (IS_I945G(dev) || IS_I945GM(dev) || IS_G33(dev))
4683 for (i = 0; i < 8; i++)
4684 I915_WRITE(FENCE_REG_945_8 + (i * 4), 0);
4685 }
4686 i915_gem_detect_bit_6_swizzle(dev);
4687 init_waitqueue_head(&dev_priv->pending_flip_queue);
4688}
4689
4690/*
4691 * Create a physically contiguous memory object for this object
4692 * e.g. for cursor + overlay regs
4693 */
4694int i915_gem_init_phys_object(struct drm_device *dev,
4695 int id, int size, int align)
4696{
4697 drm_i915_private_t *dev_priv = dev->dev_private;
4698 struct drm_i915_gem_phys_object *phys_obj;
4699 int ret;
4700
4701 if (dev_priv->mm.phys_objs[id - 1] || !size)
4702 return 0;
4703
4704 phys_obj = kzalloc(sizeof(struct drm_i915_gem_phys_object), GFP_KERNEL);
4705 if (!phys_obj)
4706 return -ENOMEM;
4707
4708 phys_obj->id = id;
4709
4710 phys_obj->handle = drm_pci_alloc(dev, size, align);
4711 if (!phys_obj->handle) {
4712 ret = -ENOMEM;
4713 goto kfree_obj;
4714 }
4715#ifdef CONFIG_X86
4716 set_memory_wc((unsigned long)phys_obj->handle->vaddr, phys_obj->handle->size / PAGE_SIZE);
4717#endif
4718
4719 dev_priv->mm.phys_objs[id - 1] = phys_obj;
4720
4721 return 0;
4722kfree_obj:
4723 kfree(phys_obj);
4724 return ret;
4725}
4726
4727void i915_gem_free_phys_object(struct drm_device *dev, int id)
4728{
4729 drm_i915_private_t *dev_priv = dev->dev_private;
4730 struct drm_i915_gem_phys_object *phys_obj;
4731
4732 if (!dev_priv->mm.phys_objs[id - 1])
4733 return;
4734
4735 phys_obj = dev_priv->mm.phys_objs[id - 1];
4736 if (phys_obj->cur_obj) {
4737 i915_gem_detach_phys_object(dev, phys_obj->cur_obj);
4738 }
4739
4740#ifdef CONFIG_X86
4741 set_memory_wb((unsigned long)phys_obj->handle->vaddr, phys_obj->handle->size / PAGE_SIZE);
4742#endif
4743 drm_pci_free(dev, phys_obj->handle);
4744 kfree(phys_obj);
4745 dev_priv->mm.phys_objs[id - 1] = NULL;
4746}
4747
4748void i915_gem_free_all_phys_object(struct drm_device *dev)
4749{
4750 int i;
4751
4752 for (i = I915_GEM_PHYS_CURSOR_0; i <= I915_MAX_PHYS_OBJECT; i++)
4753 i915_gem_free_phys_object(dev, i);
4754}
4755
4756void i915_gem_detach_phys_object(struct drm_device *dev,
4757 struct drm_gem_object *obj)
4758{
4759 struct drm_i915_gem_object *obj_priv;
4760 int i;
4761 int ret;
4762 int page_count;
4763
4764 obj_priv = to_intel_bo(obj);
4765 if (!obj_priv->phys_obj)
4766 return;
4767
4768 ret = i915_gem_object_get_pages(obj, 0);
4769 if (ret)
4770 goto out;
4771
4772 page_count = obj->size / PAGE_SIZE;
4773
4774 for (i = 0; i < page_count; i++) {
4775 char *dst = kmap_atomic(obj_priv->pages[i], KM_USER0);
4776 char *src = obj_priv->phys_obj->handle->vaddr + (i * PAGE_SIZE);
4777
4778 memcpy(dst, src, PAGE_SIZE);
4779 kunmap_atomic(dst, KM_USER0);
4780 }
4781 drm_clflush_pages(obj_priv->pages, page_count);
4782 drm_agp_chipset_flush(dev);
4783
4784 i915_gem_object_put_pages(obj);
4785out:
4786 obj_priv->phys_obj->cur_obj = NULL;
4787 obj_priv->phys_obj = NULL;
4788}
4789
4790int
4791i915_gem_attach_phys_object(struct drm_device *dev,
4792 struct drm_gem_object *obj,
4793 int id,
4794 int align)
4795{
4796 drm_i915_private_t *dev_priv = dev->dev_private;
4797 struct drm_i915_gem_object *obj_priv;
4798 int ret = 0;
4799 int page_count;
4800 int i;
4801
4802 if (id > I915_MAX_PHYS_OBJECT)
4803 return -EINVAL;
4804
4805 obj_priv = to_intel_bo(obj);
4806
4807 if (obj_priv->phys_obj) {
4808 if (obj_priv->phys_obj->id == id)
4809 return 0;
4810 i915_gem_detach_phys_object(dev, obj);
4811 }
4812
4813 /* create a new object */
4814 if (!dev_priv->mm.phys_objs[id - 1]) {
4815 ret = i915_gem_init_phys_object(dev, id,
4816 obj->size, align);
4817 if (ret) {
4818 DRM_ERROR("failed to init phys object %d size: %zu\n", id, obj->size);
4819 goto out;
4820 }
4821 }
4822
4823 /* bind to the object */
4824 obj_priv->phys_obj = dev_priv->mm.phys_objs[id - 1];
4825 obj_priv->phys_obj->cur_obj = obj;
4826
4827 ret = i915_gem_object_get_pages(obj, 0);
4828 if (ret) {
4829 DRM_ERROR("failed to get page list\n");
4830 goto out;
4831 }
4832
4833 page_count = obj->size / PAGE_SIZE;
4834
4835 for (i = 0; i < page_count; i++) {
4836 char *src = kmap_atomic(obj_priv->pages[i], KM_USER0);
4837 char *dst = obj_priv->phys_obj->handle->vaddr + (i * PAGE_SIZE);
4838
4839 memcpy(dst, src, PAGE_SIZE);
4840 kunmap_atomic(src, KM_USER0);
4841 }
4842
4843 i915_gem_object_put_pages(obj);
4844
4845 return 0;
4846out:
4847 return ret;
4848}
4849
4850static int
4851i915_gem_phys_pwrite(struct drm_device *dev, struct drm_gem_object *obj,
4852 struct drm_i915_gem_pwrite *args,
4853 struct drm_file *file_priv)
4854{
4855 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
4856 void *obj_addr;
4857 int ret;
4858 char __user *user_data;
4859
4860 user_data = (char __user *) (uintptr_t) args->data_ptr;
4861 obj_addr = obj_priv->phys_obj->handle->vaddr + args->offset;
4862
4863 DRM_DEBUG_DRIVER("obj_addr %p, %lld\n", obj_addr, args->size);
4864 ret = copy_from_user(obj_addr, user_data, args->size);
4865 if (ret)
4866 return -EFAULT;
4867
4868 drm_agp_chipset_flush(dev);
4869 return 0;
4870}
4871
4872void i915_gem_release(struct drm_device * dev, struct drm_file *file_priv)
4873{
4874 struct drm_i915_file_private *i915_file_priv = file_priv->driver_priv;
4875
4876 /* Clean up our request list when the client is going away, so that
4877 * later retire_requests won't dereference our soon-to-be-gone
4878 * file_priv.
4879 */
4880 mutex_lock(&dev->struct_mutex);
4881 while (!list_empty(&i915_file_priv->mm.request_list))
4882 list_del_init(i915_file_priv->mm.request_list.next);
4883 mutex_unlock(&dev->struct_mutex);
4884}
4885
4886static int
4887i915_gpu_is_active(struct drm_device *dev)
4888{
4889 drm_i915_private_t *dev_priv = dev->dev_private;
4890 int lists_empty;
4891
4892 spin_lock(&dev_priv->mm.active_list_lock);
4893 lists_empty = list_empty(&dev_priv->mm.flushing_list) &&
4894 list_empty(&dev_priv->render_ring.active_list);
4895 if (HAS_BSD(dev))
4896 lists_empty &= list_empty(&dev_priv->bsd_ring.active_list);
4897 spin_unlock(&dev_priv->mm.active_list_lock);
4898
4899 return !lists_empty;
4900}
4901
4902static int
4903i915_gem_shrink(struct shrinker *shrink, int nr_to_scan, gfp_t gfp_mask)
4904{
4905 drm_i915_private_t *dev_priv, *next_dev;
4906 struct drm_i915_gem_object *obj_priv, *next_obj;
4907 int cnt = 0;
4908 int would_deadlock = 1;
4909
4910 /* "fast-path" to count number of available objects */
4911 if (nr_to_scan == 0) {
4912 spin_lock(&shrink_list_lock);
4913 list_for_each_entry(dev_priv, &shrink_list, mm.shrink_list) {
4914 struct drm_device *dev = dev_priv->dev;
4915
4916 if (mutex_trylock(&dev->struct_mutex)) {
4917 list_for_each_entry(obj_priv,
4918 &dev_priv->mm.inactive_list,
4919 list)
4920 cnt++;
4921 mutex_unlock(&dev->struct_mutex);
4922 }
4923 }
4924 spin_unlock(&shrink_list_lock);
4925
4926 return (cnt / 100) * sysctl_vfs_cache_pressure;
4927 }
4928
4929 spin_lock(&shrink_list_lock);
4930
4931rescan:
4932 /* first scan for clean buffers */
4933 list_for_each_entry_safe(dev_priv, next_dev,
4934 &shrink_list, mm.shrink_list) {
4935 struct drm_device *dev = dev_priv->dev;
4936
4937 if (! mutex_trylock(&dev->struct_mutex))
4938 continue;
4939
4940 spin_unlock(&shrink_list_lock);
4941 i915_gem_retire_requests(dev);
4942
4943 list_for_each_entry_safe(obj_priv, next_obj,
4944 &dev_priv->mm.inactive_list,
4945 list) {
4946 if (i915_gem_object_is_purgeable(obj_priv)) {
4947 i915_gem_object_unbind(&obj_priv->base);
4948 if (--nr_to_scan <= 0)
4949 break;
4950 }
4951 }
4952
4953 spin_lock(&shrink_list_lock);
4954 mutex_unlock(&dev->struct_mutex);
4955
4956 would_deadlock = 0;
4957
4958 if (nr_to_scan <= 0)
4959 break;
4960 }
4961
4962 /* second pass, evict/count anything still on the inactive list */
4963 list_for_each_entry_safe(dev_priv, next_dev,
4964 &shrink_list, mm.shrink_list) {
4965 struct drm_device *dev = dev_priv->dev;
4966
4967 if (! mutex_trylock(&dev->struct_mutex))
4968 continue;
4969
4970 spin_unlock(&shrink_list_lock);
4971
4972 list_for_each_entry_safe(obj_priv, next_obj,
4973 &dev_priv->mm.inactive_list,
4974 list) {
4975 if (nr_to_scan > 0) {
4976 i915_gem_object_unbind(&obj_priv->base);
4977 nr_to_scan--;
4978 } else
4979 cnt++;
4980 }
4981
4982 spin_lock(&shrink_list_lock);
4983 mutex_unlock(&dev->struct_mutex);
4984
4985 would_deadlock = 0;
4986 }
4987
4988 if (nr_to_scan) {
4989 int active = 0;
4990
4991 /*
4992 * We are desperate for pages, so as a last resort, wait
4993 * for the GPU to finish and discard whatever we can.
4994 * This has a dramatic impact to reduce the number of
4995 * OOM-killer events whilst running the GPU aggressively.
4996 */
4997 list_for_each_entry(dev_priv, &shrink_list, mm.shrink_list) {
4998 struct drm_device *dev = dev_priv->dev;
4999
5000 if (!mutex_trylock(&dev->struct_mutex))
5001 continue;
5002
5003 spin_unlock(&shrink_list_lock);
5004
5005 if (i915_gpu_is_active(dev)) {
5006 i915_gpu_idle(dev);
5007 active++;
5008 }
5009
5010 spin_lock(&shrink_list_lock);
5011 mutex_unlock(&dev->struct_mutex);
5012 }
5013
5014 if (active)
5015 goto rescan;
5016 }
5017
5018 spin_unlock(&shrink_list_lock);
5019
5020 if (would_deadlock)
5021 return -1;
5022 else if (cnt > 0)
5023 return (cnt / 100) * sysctl_vfs_cache_pressure;
5024 else
5025 return 0;
5026}
5027
5028static struct shrinker shrinker = {
5029 .shrink = i915_gem_shrink,
5030 .seeks = DEFAULT_SEEKS,
5031};
5032
5033__init void
5034i915_gem_shrinker_init(void)
5035{
5036 register_shrinker(&shrinker);
5037}
5038
5039__exit void
5040i915_gem_shrinker_exit(void)
5041{
5042 unregister_shrinker(&shrinker);
5043}
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