]>
Commit | Line | Data |
---|---|---|
bef4a34a HJ |
1 | /* |
2 | * | |
3 | * Copyright (c) 2009, Microsoft Corporation. | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms and conditions of the GNU General Public License, | |
7 | * version 2, as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License along with | |
15 | * this program; if not, write to the Free Software Foundation, Inc., 59 Temple | |
16 | * Place - Suite 330, Boston, MA 02111-1307 USA. | |
17 | * | |
18 | * Authors: | |
19 | * Haiyang Zhang <haiyangz@microsoft.com> | |
20 | * Hank Janssen <hjanssen@microsoft.com> | |
21 | * | |
22 | */ | |
23 | ||
bef4a34a HJ |
24 | #include <linux/init.h> |
25 | #include <linux/module.h> | |
26 | #include <linux/device.h> | |
27 | #include <linux/blkdev.h> | |
28 | ||
29 | #include <scsi/scsi.h> | |
30 | #include <scsi/scsi_cmnd.h> | |
31 | #include <scsi/scsi_host.h> | |
32 | #include <scsi/scsi_device.h> | |
33 | #include <scsi/scsi_tcq.h> | |
34 | #include <scsi/scsi_eh.h> | |
35 | #include <scsi/scsi_devinfo.h> | |
36 | ||
bef4a34a | 37 | #include <scsi/scsi_dbg.h> |
bef4a34a | 38 | |
4983b39a | 39 | #include "osd.h" |
645954c5 | 40 | #include "logging.h" |
870cde80 | 41 | #include "vmbus.h" |
731a7884 | 42 | #include "StorVscApi.h" |
bef4a34a | 43 | |
bef4a34a | 44 | |
454f18a9 BP |
45 | /* #defines */ |
46 | ||
47 | ||
48 | ||
49 | /* Data types */ | |
50 | ||
bef4a34a | 51 | struct host_device_context { |
454f18a9 BP |
52 | struct work_struct host_rescan_work; /* must be 1st field */ |
53 | struct device_context *device_ctx; /* point back to our device context */ | |
bef4a34a | 54 | struct kmem_cache *request_pool; |
bef4a34a HJ |
55 | unsigned int port; |
56 | unsigned char path; | |
57 | unsigned char target; | |
58 | }; | |
59 | ||
60 | struct storvsc_cmd_request { | |
61 | struct list_head entry; | |
62 | struct scsi_cmnd *cmd; | |
63 | ||
64 | unsigned int bounce_sgl_count; | |
65 | struct scatterlist *bounce_sgl; | |
66 | ||
0b3f6834 | 67 | struct hv_storvsc_request request; |
454f18a9 BP |
68 | /* !!!DO NOT ADD ANYTHING BELOW HERE!!! */ |
69 | /* The extension buffer falls right here and is pointed to by request.Extension; */ | |
bef4a34a HJ |
70 | }; |
71 | ||
72 | struct storvsc_driver_context { | |
454f18a9 | 73 | /* !! These must be the first 2 fields !! */ |
bef4a34a | 74 | struct driver_context drv_ctx; |
9f0c7d2c | 75 | struct storvsc_driver_object drv_obj; |
bef4a34a HJ |
76 | }; |
77 | ||
454f18a9 | 78 | /* Static decl */ |
bef4a34a HJ |
79 | static int storvsc_probe(struct device *dev); |
80 | static int storvsc_queuecommand(struct scsi_cmnd *scmnd, void (*done)(struct scsi_cmnd *)); | |
81 | static int storvsc_device_alloc(struct scsi_device *); | |
82 | static int storvsc_device_configure(struct scsi_device *); | |
83 | static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd); | |
bef4a34a | 84 | static void storvsc_host_rescan_callback(struct work_struct *work); |
3d3b5518 | 85 | static void storvsc_host_rescan(struct hv_device* device_obj); |
bef4a34a HJ |
86 | static int storvsc_remove(struct device *dev); |
87 | ||
88 | static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count, unsigned int len); | |
89 | static void destroy_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count); | |
90 | static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count); | |
91 | static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl, struct scatterlist *bounce_sgl, unsigned int orig_sgl_count); | |
92 | static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl, struct scatterlist *bounce_sgl, unsigned int orig_sgl_count); | |
93 | ||
94 | static int storvsc_report_luns(struct scsi_device *sdev, unsigned int luns[], unsigned int *lun_count); | |
95 | static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, sector_t capacity, int *info); | |
96 | ||
97 | ||
98 | static int storvsc_ringbuffer_size = STORVSC_RING_BUFFER_SIZE; | |
99 | ||
454f18a9 | 100 | /* The one and only one */ |
bef4a34a HJ |
101 | static struct storvsc_driver_context g_storvsc_drv; |
102 | ||
454f18a9 | 103 | /* Scsi driver */ |
bef4a34a HJ |
104 | static struct scsi_host_template scsi_driver = { |
105 | .module = THIS_MODULE, | |
106 | .name = "storvsc_host_t", | |
107 | .bios_param = storvsc_get_chs, | |
108 | .queuecommand = storvsc_queuecommand, | |
109 | .eh_host_reset_handler = storvsc_host_reset_handler, | |
110 | .slave_alloc = storvsc_device_alloc, | |
111 | .slave_configure = storvsc_device_configure, | |
112 | .cmd_per_lun = 1, | |
454f18a9 | 113 | .can_queue = STORVSC_MAX_IO_REQUESTS*STORVSC_MAX_TARGETS, /* 64 max_queue * 1 target */ |
bef4a34a | 114 | .this_id = -1, |
454f18a9 BP |
115 | /* no use setting to 0 since ll_blk_rw reset it to 1 */ |
116 | .sg_tablesize = MAX_MULTIPAGE_BUFFER_COUNT,/* currently 32 */ | |
117 | /* ENABLE_CLUSTERING allows mutiple physically contig bio_vecs to merge into 1 sg element. If set, we must */ | |
118 | /* limit the max_segment_size to PAGE_SIZE, otherwise we may get 1 sg element that represents multiple */ | |
119 | /* physically contig pfns (ie sg[x].length > PAGE_SIZE). */ | |
bef4a34a | 120 | .use_clustering = ENABLE_CLUSTERING, |
454f18a9 | 121 | /* Make sure we dont get a sg segment crosses a page boundary */ |
bef4a34a HJ |
122 | .dma_boundary = PAGE_SIZE-1, |
123 | }; | |
124 | ||
125 | ||
126 | /*++ | |
127 | ||
128 | Name: storvsc_drv_init() | |
129 | ||
130 | Desc: StorVsc driver initialization. | |
131 | ||
132 | --*/ | |
bd1de709 | 133 | static int storvsc_drv_init(PFN_DRIVERINITIALIZE pfn_drv_init) |
bef4a34a HJ |
134 | { |
135 | int ret=0; | |
9f0c7d2c | 136 | struct storvsc_driver_object *storvsc_drv_obj = &g_storvsc_drv.drv_obj; |
bef4a34a HJ |
137 | struct driver_context *drv_ctx=&g_storvsc_drv.drv_ctx; |
138 | ||
139 | DPRINT_ENTER(STORVSC_DRV); | |
140 | ||
141 | vmbus_get_interface(&storvsc_drv_obj->Base.VmbusChannelInterface); | |
142 | ||
143 | storvsc_drv_obj->RingBufferSize = storvsc_ringbuffer_size; | |
144 | storvsc_drv_obj->OnHostRescan = storvsc_host_rescan; | |
145 | ||
454f18a9 | 146 | /* Callback to client driver to complete the initialization */ |
bef4a34a HJ |
147 | pfn_drv_init(&storvsc_drv_obj->Base); |
148 | ||
149 | DPRINT_INFO(STORVSC_DRV, "request extension size %u, max outstanding reqs %u", storvsc_drv_obj->RequestExtSize, storvsc_drv_obj->MaxOutstandingRequestsPerChannel); | |
150 | ||
151 | if (storvsc_drv_obj->MaxOutstandingRequestsPerChannel < STORVSC_MAX_IO_REQUESTS) | |
152 | { | |
153 | DPRINT_ERR(STORVSC_DRV, "The number of outstanding io requests (%d) is larger than that supported (%d) internally.", | |
154 | STORVSC_MAX_IO_REQUESTS, storvsc_drv_obj->MaxOutstandingRequestsPerChannel); | |
155 | return -1; | |
156 | } | |
157 | ||
158 | drv_ctx->driver.name = storvsc_drv_obj->Base.name; | |
caf26a31 | 159 | memcpy(&drv_ctx->class_id, &storvsc_drv_obj->Base.deviceType, sizeof(struct hv_guid)); |
bef4a34a | 160 | |
bef4a34a HJ |
161 | drv_ctx->probe = storvsc_probe; |
162 | drv_ctx->remove = storvsc_remove; | |
bef4a34a | 163 | |
454f18a9 | 164 | /* The driver belongs to vmbus */ |
5d48a1c2 | 165 | ret = vmbus_child_driver_register(drv_ctx); |
bef4a34a HJ |
166 | |
167 | DPRINT_EXIT(STORVSC_DRV); | |
168 | ||
169 | return ret; | |
170 | } | |
171 | ||
172 | ||
173 | static int storvsc_drv_exit_cb(struct device *dev, void *data) | |
174 | { | |
175 | struct device **curr = (struct device **)data; | |
176 | *curr = dev; | |
454f18a9 | 177 | return 1; /* stop iterating */ |
bef4a34a HJ |
178 | } |
179 | ||
180 | /*++ | |
181 | ||
182 | Name: storvsc_drv_exit() | |
183 | ||
184 | Desc: | |
185 | ||
186 | --*/ | |
bd1de709 | 187 | static void storvsc_drv_exit(void) |
bef4a34a | 188 | { |
9f0c7d2c | 189 | struct storvsc_driver_object *storvsc_drv_obj = &g_storvsc_drv.drv_obj; |
bef4a34a | 190 | struct driver_context *drv_ctx=&g_storvsc_drv.drv_ctx; |
bef4a34a | 191 | struct device *current_dev=NULL; |
2295ba2e | 192 | int ret; |
bef4a34a | 193 | |
bef4a34a HJ |
194 | DPRINT_ENTER(STORVSC_DRV); |
195 | ||
196 | while (1) | |
197 | { | |
198 | current_dev = NULL; | |
199 | ||
454f18a9 | 200 | /* Get the device */ |
2295ba2e BP |
201 | ret = driver_for_each_device(&drv_ctx->driver, NULL, |
202 | (void *) ¤t_dev, | |
203 | storvsc_drv_exit_cb); | |
204 | ||
205 | if (ret) | |
206 | DPRINT_WARN(STORVSC_DRV, | |
207 | "driver_for_each_device returned %d", ret); | |
bef4a34a HJ |
208 | |
209 | if (current_dev == NULL) | |
210 | break; | |
211 | ||
454f18a9 | 212 | /* Initiate removal from the top-down */ |
bef4a34a HJ |
213 | device_unregister(current_dev); |
214 | } | |
215 | ||
216 | if (storvsc_drv_obj->Base.OnCleanup) | |
217 | storvsc_drv_obj->Base.OnCleanup(&storvsc_drv_obj->Base); | |
218 | ||
219 | vmbus_child_driver_unregister(drv_ctx); | |
220 | ||
221 | DPRINT_EXIT(STORVSC_DRV); | |
222 | ||
223 | return; | |
224 | } | |
225 | ||
226 | /*++ | |
227 | ||
228 | Name: storvsc_probe() | |
229 | ||
230 | Desc: Add a new device for this driver | |
231 | ||
232 | --*/ | |
233 | static int storvsc_probe(struct device *device) | |
234 | { | |
235 | int ret=0; | |
236 | ||
237 | struct driver_context *driver_ctx = driver_to_driver_context(device->driver); | |
238 | struct storvsc_driver_context *storvsc_drv_ctx = (struct storvsc_driver_context*)driver_ctx; | |
9f0c7d2c | 239 | struct storvsc_driver_object *storvsc_drv_obj = &storvsc_drv_ctx->drv_obj; |
bef4a34a HJ |
240 | |
241 | struct device_context *device_ctx = device_to_device_context(device); | |
3d3b5518 | 242 | struct hv_device *device_obj = &device_ctx->device_obj; |
bef4a34a HJ |
243 | |
244 | struct Scsi_Host *host; | |
245 | struct host_device_context *host_device_ctx; | |
9f0c7d2c | 246 | struct storvsc_device_info device_info; |
bef4a34a HJ |
247 | |
248 | DPRINT_ENTER(STORVSC_DRV); | |
249 | ||
250 | if (!storvsc_drv_obj->Base.OnDeviceAdd) | |
251 | return -1; | |
252 | ||
253 | host = scsi_host_alloc(&scsi_driver, sizeof(struct host_device_context)); | |
254 | if (!host) | |
255 | { | |
256 | DPRINT_ERR(STORVSC_DRV, "unable to allocate scsi host object"); | |
257 | return -ENOMEM; | |
258 | } | |
259 | ||
0883c52b | 260 | dev_set_drvdata(device, host); |
bef4a34a HJ |
261 | |
262 | host_device_ctx = (struct host_device_context*)host->hostdata; | |
263 | memset(host_device_ctx, 0, sizeof(struct host_device_context)); | |
264 | ||
265 | host_device_ctx->port = host->host_no; | |
266 | host_device_ctx->device_ctx = device_ctx; | |
267 | ||
bef4a34a | 268 | INIT_WORK(&host_device_ctx->host_rescan_work, storvsc_host_rescan_callback); |
bef4a34a | 269 | |
bef4a34a HJ |
270 | host_device_ctx->request_pool = |
271 | kmem_cache_create | |
97f4ee3d | 272 | (dev_name(&device_ctx->device), |
bef4a34a HJ |
273 | sizeof(struct storvsc_cmd_request) + storvsc_drv_obj->RequestExtSize, |
274 | 0, | |
275 | SLAB_HWCACHE_ALIGN, NULL); | |
bef4a34a HJ |
276 | |
277 | if (!host_device_ctx->request_pool) | |
278 | { | |
279 | scsi_host_put(host); | |
280 | DPRINT_EXIT(STORVSC_DRV); | |
281 | ||
282 | return -ENOMEM; | |
283 | } | |
284 | ||
285 | device_info.PortNumber = host->host_no; | |
454f18a9 | 286 | /* Call to the vsc driver to add the device */ |
bef4a34a HJ |
287 | ret = storvsc_drv_obj->Base.OnDeviceAdd(device_obj, (void*)&device_info); |
288 | if (ret != 0) | |
289 | { | |
290 | DPRINT_ERR(STORVSC_DRV, "unable to add scsi vsc device"); | |
291 | kmem_cache_destroy(host_device_ctx->request_pool); | |
292 | scsi_host_put(host); | |
293 | DPRINT_EXIT(STORVSC_DRV); | |
294 | ||
295 | return -1; | |
296 | } | |
297 | ||
454f18a9 | 298 | /* host_device_ctx->port = device_info.PortNumber; */ |
bef4a34a HJ |
299 | host_device_ctx->path = device_info.PathId; |
300 | host_device_ctx->target = device_info.TargetId; | |
301 | ||
454f18a9 BP |
302 | host->max_lun = STORVSC_MAX_LUNS_PER_TARGET; /* max # of devices per target */ |
303 | host->max_id = STORVSC_MAX_TARGETS; /* max # of targets per channel */ | |
304 | host->max_channel = STORVSC_MAX_CHANNELS -1; /* max # of channels */ | |
bef4a34a | 305 | |
454f18a9 | 306 | /* Register the HBA and start the scsi bus scan */ |
bef4a34a HJ |
307 | ret = scsi_add_host(host, device); |
308 | if (ret != 0) | |
309 | { | |
310 | DPRINT_ERR(STORVSC_DRV, "unable to add scsi host device"); | |
311 | ||
312 | storvsc_drv_obj->Base.OnDeviceRemove(device_obj); | |
313 | ||
314 | kmem_cache_destroy(host_device_ctx->request_pool); | |
315 | scsi_host_put(host); | |
316 | DPRINT_EXIT(STORVSC_DRV); | |
317 | ||
318 | return -1; | |
319 | } | |
320 | ||
321 | scsi_scan_host(host); | |
322 | ||
323 | DPRINT_EXIT(STORVSC_DRV); | |
324 | ||
325 | return ret; | |
326 | } | |
327 | ||
328 | ||
329 | /*++ | |
330 | ||
331 | Name: storvsc_remove() | |
332 | ||
333 | Desc: Callback when our device is removed | |
334 | ||
335 | --*/ | |
336 | static int storvsc_remove(struct device *device) | |
337 | { | |
338 | int ret=0; | |
339 | ||
340 | struct driver_context *driver_ctx = driver_to_driver_context(device->driver); | |
341 | struct storvsc_driver_context *storvsc_drv_ctx = (struct storvsc_driver_context*)driver_ctx; | |
9f0c7d2c | 342 | struct storvsc_driver_object *storvsc_drv_obj = &storvsc_drv_ctx->drv_obj; |
bef4a34a HJ |
343 | |
344 | struct device_context *device_ctx = device_to_device_context(device); | |
3d3b5518 | 345 | struct hv_device *device_obj = &device_ctx->device_obj; |
bef4a34a | 346 | |
0883c52b | 347 | struct Scsi_Host *host = dev_get_drvdata(device); |
bef4a34a HJ |
348 | struct host_device_context *host_device_ctx=(struct host_device_context*)host->hostdata; |
349 | ||
350 | ||
351 | DPRINT_ENTER(STORVSC_DRV); | |
352 | ||
353 | if (!storvsc_drv_obj->Base.OnDeviceRemove) | |
354 | { | |
355 | DPRINT_EXIT(STORVSC_DRV); | |
356 | return -1; | |
357 | } | |
358 | ||
454f18a9 | 359 | /* Call to the vsc driver to let it know that the device is being removed */ |
bef4a34a HJ |
360 | ret = storvsc_drv_obj->Base.OnDeviceRemove(device_obj); |
361 | if (ret != 0) | |
362 | { | |
454f18a9 | 363 | /* TODO: */ |
bef4a34a HJ |
364 | DPRINT_ERR(STORVSC, "unable to remove vsc device (ret %d)", ret); |
365 | } | |
366 | ||
367 | if (host_device_ctx->request_pool) | |
368 | { | |
369 | kmem_cache_destroy(host_device_ctx->request_pool); | |
370 | host_device_ctx->request_pool = NULL; | |
371 | } | |
372 | ||
373 | DPRINT_INFO(STORVSC, "removing host adapter (%p)...", host); | |
374 | scsi_remove_host(host); | |
375 | ||
376 | DPRINT_INFO(STORVSC, "releasing host adapter (%p)...", host); | |
377 | scsi_host_put(host); | |
378 | ||
379 | DPRINT_EXIT(STORVSC_DRV); | |
380 | ||
381 | return ret; | |
382 | } | |
383 | ||
384 | /*++ | |
385 | ||
386 | Name: storvsc_commmand_completion() | |
387 | ||
388 | Desc: Command completion processing | |
389 | ||
390 | --*/ | |
0b3f6834 | 391 | static void storvsc_commmand_completion(struct hv_storvsc_request *request) |
bef4a34a HJ |
392 | { |
393 | struct storvsc_cmd_request *cmd_request = (struct storvsc_cmd_request*)request->Context; | |
394 | struct scsi_cmnd *scmnd = cmd_request->cmd; | |
395 | struct host_device_context *host_device_ctx = (struct host_device_context*)scmnd->device->host->hostdata; | |
396 | void (*scsi_done_fn)(struct scsi_cmnd *); | |
bef4a34a | 397 | struct scsi_sense_hdr sense_hdr; |
bef4a34a HJ |
398 | |
399 | ASSERT(request == &cmd_request->request); | |
400 | ASSERT((unsigned long)scmnd->host_scribble == (unsigned long)cmd_request); | |
401 | ASSERT(scmnd); | |
402 | ASSERT(scmnd->scsi_done); | |
403 | ||
404 | DPRINT_ENTER(STORVSC_DRV); | |
405 | ||
454f18a9 | 406 | if (cmd_request->bounce_sgl_count)/* using bounce buffer */ |
bef4a34a | 407 | { |
454f18a9 | 408 | /* printk("copy_from_bounce_buffer\n"); */ |
bef4a34a | 409 | |
454f18a9 | 410 | /* FIXME: We can optimize on writes by just skipping this */ |
bef4a34a | 411 | copy_from_bounce_buffer(scsi_sglist(scmnd), cmd_request->bounce_sgl, scsi_sg_count(scmnd)); |
bef4a34a HJ |
412 | destroy_bounce_buffer(cmd_request->bounce_sgl, cmd_request->bounce_sgl_count); |
413 | } | |
414 | ||
415 | scmnd->result = request->Status; | |
416 | ||
417 | if (scmnd->result) | |
418 | { | |
bef4a34a HJ |
419 | if (scsi_normalize_sense(scmnd->sense_buffer, request->SenseBufferSize, &sense_hdr)) |
420 | { | |
421 | scsi_print_sense_hdr("storvsc", &sense_hdr); | |
422 | } | |
bef4a34a HJ |
423 | } |
424 | ||
425 | ASSERT(request->BytesXfer <= request->DataBuffer.Length); | |
bef4a34a | 426 | scsi_set_resid(scmnd, request->DataBuffer.Length - request->BytesXfer); |
bef4a34a HJ |
427 | |
428 | scsi_done_fn = scmnd->scsi_done; | |
429 | ||
430 | scmnd->host_scribble = NULL; | |
431 | scmnd->scsi_done = NULL; | |
432 | ||
454f18a9 | 433 | /* !!DO NOT MODIFY the scmnd after this call */ |
bef4a34a HJ |
434 | scsi_done_fn(scmnd); |
435 | ||
436 | kmem_cache_free(host_device_ctx->request_pool, cmd_request); | |
437 | ||
438 | DPRINT_EXIT(STORVSC_DRV); | |
439 | } | |
440 | ||
441 | static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count) | |
442 | { | |
443 | int i=0; | |
444 | ||
454f18a9 | 445 | /* No need to check */ |
bef4a34a HJ |
446 | if (sg_count < 2) |
447 | return -1; | |
448 | ||
454f18a9 | 449 | /* We have at least 2 sg entries */ |
bef4a34a HJ |
450 | for ( i=0; i<sg_count; i++ ) |
451 | { | |
454f18a9 | 452 | if (i == 0) /* make sure 1st one does not have hole */ |
bef4a34a HJ |
453 | { |
454 | if (sgl[i].offset + sgl[i].length != PAGE_SIZE) | |
455 | return i; | |
456 | } | |
454f18a9 | 457 | else if (i == sg_count - 1) /* make sure last one does not have hole */ |
bef4a34a HJ |
458 | { |
459 | if (sgl[i].offset != 0) | |
460 | return i; | |
461 | } | |
454f18a9 | 462 | else /* make sure no hole in the middle */ |
bef4a34a HJ |
463 | { |
464 | if (sgl[i].length != PAGE_SIZE || sgl[i].offset != 0) | |
465 | { | |
466 | return i; | |
467 | } | |
468 | } | |
469 | } | |
470 | return -1; | |
471 | } | |
472 | ||
473 | static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count, unsigned int len) | |
474 | { | |
475 | int i; | |
476 | int num_pages=0; | |
477 | struct scatterlist* bounce_sgl; | |
478 | struct page *page_buf; | |
479 | ||
480 | num_pages = ALIGN_UP(len, PAGE_SIZE) >> PAGE_SHIFT; | |
481 | ||
06da0bc8 | 482 | bounce_sgl = kcalloc(num_pages, sizeof(struct scatterlist), GFP_ATOMIC); |
bef4a34a HJ |
483 | if (!bounce_sgl) |
484 | { | |
485 | return NULL; | |
486 | } | |
487 | ||
488 | for(i=0; i<num_pages; i++) | |
489 | { | |
490 | page_buf = alloc_page(GFP_ATOMIC); | |
491 | if (!page_buf) | |
492 | { | |
493 | goto cleanup; | |
494 | } | |
bef4a34a | 495 | sg_set_page(&bounce_sgl[i], page_buf, 0, 0); |
bef4a34a HJ |
496 | } |
497 | ||
498 | return bounce_sgl; | |
499 | ||
500 | cleanup: | |
501 | destroy_bounce_buffer(bounce_sgl, num_pages); | |
502 | return NULL; | |
503 | } | |
504 | ||
505 | static void destroy_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count) | |
506 | { | |
507 | int i; | |
508 | struct page *page_buf; | |
509 | ||
510 | for (i=0; i<sg_count; i++) | |
511 | { | |
bef4a34a | 512 | if ((page_buf = sg_page((&sgl[i]))) != NULL) |
bef4a34a HJ |
513 | |
514 | { | |
515 | __free_page(page_buf); | |
516 | } | |
517 | } | |
518 | ||
519 | kfree(sgl); | |
520 | } | |
521 | ||
454f18a9 | 522 | /* Assume the bounce_sgl has enough room ie using the create_bounce_buffer() */ |
bef4a34a HJ |
523 | static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl, struct scatterlist *bounce_sgl, unsigned int orig_sgl_count) |
524 | { | |
525 | int i=0,j=0; | |
526 | unsigned long src, dest; | |
527 | unsigned int srclen, destlen, copylen; | |
528 | unsigned int total_copied=0; | |
529 | unsigned long bounce_addr=0; | |
530 | unsigned long src_addr=0; | |
531 | unsigned long flags; | |
532 | ||
533 | local_irq_save(flags); | |
534 | ||
535 | for (i=0; i<orig_sgl_count; i++) | |
536 | { | |
bef4a34a | 537 | src_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), KM_IRQ0) + orig_sgl[i].offset; |
bef4a34a HJ |
538 | src = src_addr; |
539 | srclen = orig_sgl[i].length; | |
540 | ||
454f18a9 BP |
541 | /* if (PageHighMem(orig_sgl[i].page)) */ |
542 | /* printk("HighMem page detected - addr %p", (void*)src); */ | |
bef4a34a HJ |
543 | |
544 | ASSERT(orig_sgl[i].offset + orig_sgl[i].length <= PAGE_SIZE); | |
545 | ||
546 | if (j == 0) | |
547 | { | |
bef4a34a | 548 | bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0); |
bef4a34a HJ |
549 | } |
550 | ||
551 | while (srclen) | |
552 | { | |
454f18a9 | 553 | /* assume bounce offset always == 0 */ |
bef4a34a HJ |
554 | dest = bounce_addr + bounce_sgl[j].length; |
555 | destlen = PAGE_SIZE - bounce_sgl[j].length; | |
556 | ||
fc6a4b26 | 557 | copylen = min(srclen, destlen); |
bef4a34a HJ |
558 | memcpy((void*)dest, (void*)src, copylen); |
559 | ||
560 | total_copied += copylen; | |
561 | bounce_sgl[j].length += copylen; | |
562 | srclen -= copylen; | |
563 | src += copylen; | |
564 | ||
454f18a9 | 565 | if (bounce_sgl[j].length == PAGE_SIZE) /* full..move to next entry */ |
bef4a34a HJ |
566 | { |
567 | kunmap_atomic((void*)bounce_addr, KM_IRQ0); | |
568 | j++; | |
569 | ||
454f18a9 | 570 | /* if we need to use another bounce buffer */ |
bef4a34a HJ |
571 | if (srclen || i != orig_sgl_count -1) |
572 | { | |
bef4a34a | 573 | bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0); |
bef4a34a HJ |
574 | } |
575 | } | |
454f18a9 | 576 | else if (srclen == 0 && i == orig_sgl_count -1) /* unmap the last bounce that is < PAGE_SIZE */ |
bef4a34a HJ |
577 | { |
578 | kunmap_atomic((void*)bounce_addr, KM_IRQ0); | |
579 | } | |
580 | } | |
581 | ||
582 | kunmap_atomic((void*)(src_addr - orig_sgl[i].offset), KM_IRQ0); | |
583 | } | |
584 | ||
585 | local_irq_restore(flags); | |
586 | ||
587 | return total_copied; | |
588 | } | |
589 | ||
454f18a9 | 590 | /* Assume the original sgl has enough room */ |
bef4a34a HJ |
591 | static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl, struct scatterlist *bounce_sgl, unsigned int orig_sgl_count) |
592 | { | |
593 | int i=0,j=0; | |
594 | unsigned long src, dest; | |
595 | unsigned int srclen, destlen, copylen; | |
596 | unsigned int total_copied=0; | |
597 | unsigned long bounce_addr=0; | |
598 | unsigned long dest_addr=0; | |
599 | unsigned long flags; | |
600 | ||
601 | local_irq_save(flags); | |
602 | ||
603 | for (i=0; i<orig_sgl_count; i++) | |
604 | { | |
bef4a34a | 605 | dest_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), KM_IRQ0) + orig_sgl[i].offset; |
bef4a34a HJ |
606 | dest = dest_addr; |
607 | destlen = orig_sgl[i].length; | |
608 | ASSERT(orig_sgl[i].offset + orig_sgl[i].length <= PAGE_SIZE); | |
609 | ||
610 | if (j == 0) | |
611 | { | |
bef4a34a | 612 | bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0); |
bef4a34a HJ |
613 | } |
614 | ||
615 | while (destlen) | |
616 | { | |
617 | src = bounce_addr + bounce_sgl[j].offset; | |
618 | srclen = bounce_sgl[j].length - bounce_sgl[j].offset; | |
619 | ||
fc6a4b26 | 620 | copylen = min(srclen, destlen); |
bef4a34a HJ |
621 | memcpy((void*)dest, (void*)src, copylen); |
622 | ||
623 | total_copied += copylen; | |
624 | bounce_sgl[j].offset += copylen; | |
625 | destlen -= copylen; | |
626 | dest += copylen; | |
627 | ||
454f18a9 | 628 | if (bounce_sgl[j].offset == bounce_sgl[j].length) /* full */ |
bef4a34a HJ |
629 | { |
630 | kunmap_atomic((void*)bounce_addr, KM_IRQ0); | |
631 | j++; | |
632 | ||
454f18a9 | 633 | /* if we need to use another bounce buffer */ |
bef4a34a HJ |
634 | if (destlen || i != orig_sgl_count -1) |
635 | { | |
bef4a34a | 636 | bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0); |
bef4a34a HJ |
637 | } |
638 | } | |
454f18a9 | 639 | else if (destlen == 0 && i == orig_sgl_count -1) /* unmap the last bounce that is < PAGE_SIZE */ |
bef4a34a HJ |
640 | { |
641 | kunmap_atomic((void*)bounce_addr, KM_IRQ0); | |
642 | } | |
643 | } | |
644 | ||
645 | kunmap_atomic((void*)(dest_addr - orig_sgl[i].offset), KM_IRQ0); | |
646 | } | |
647 | ||
648 | local_irq_restore(flags); | |
649 | ||
650 | return total_copied; | |
651 | } | |
652 | ||
653 | ||
654 | /*++ | |
655 | ||
656 | Name: storvsc_queuecommand() | |
657 | ||
658 | Desc: Initiate command processing | |
659 | ||
660 | --*/ | |
661 | static int storvsc_queuecommand(struct scsi_cmnd *scmnd, void (*done)(struct scsi_cmnd *)) | |
662 | { | |
663 | int ret=0; | |
664 | struct host_device_context *host_device_ctx = (struct host_device_context*)scmnd->device->host->hostdata; | |
665 | struct device_context *device_ctx=host_device_ctx->device_ctx; | |
666 | struct driver_context *driver_ctx = driver_to_driver_context(device_ctx->device.driver); | |
667 | struct storvsc_driver_context *storvsc_drv_ctx = (struct storvsc_driver_context*)driver_ctx; | |
9f0c7d2c | 668 | struct storvsc_driver_object *storvsc_drv_obj = &storvsc_drv_ctx->drv_obj; |
bef4a34a | 669 | |
0b3f6834 | 670 | struct hv_storvsc_request *request; |
bef4a34a HJ |
671 | struct storvsc_cmd_request *cmd_request; |
672 | unsigned int request_size=0; | |
673 | int i; | |
674 | struct scatterlist *sgl; | |
675 | ||
676 | DPRINT_ENTER(STORVSC_DRV); | |
677 | ||
bef4a34a HJ |
678 | DPRINT_DBG(STORVSC_DRV, "scmnd %p dir %d, use_sg %d buf %p len %d queue depth %d tagged %d", |
679 | scmnd, | |
680 | scmnd->sc_data_direction, | |
681 | scsi_sg_count(scmnd), | |
682 | scsi_sglist(scmnd), | |
683 | scsi_bufflen(scmnd), | |
684 | scmnd->device->queue_depth, | |
685 | scmnd->device->tagged_supported); | |
bef4a34a | 686 | |
454f18a9 | 687 | /* If retrying, no need to prep the cmd */ |
bef4a34a HJ |
688 | if (scmnd->host_scribble) |
689 | { | |
690 | ASSERT(scmnd->scsi_done != NULL); | |
691 | ||
692 | cmd_request = (struct storvsc_cmd_request* )scmnd->host_scribble; | |
693 | DPRINT_INFO(STORVSC_DRV, "retrying scmnd %p cmd_request %p", scmnd, cmd_request); | |
694 | ||
695 | goto retry_request; | |
696 | } | |
697 | ||
698 | ASSERT(scmnd->scsi_done == NULL); | |
699 | ASSERT(scmnd->host_scribble == NULL); | |
700 | ||
701 | scmnd->scsi_done = done; | |
702 | ||
703 | request_size = sizeof(struct storvsc_cmd_request); | |
704 | ||
705 | cmd_request = kmem_cache_alloc(host_device_ctx->request_pool, GFP_ATOMIC); | |
706 | if (!cmd_request) | |
707 | { | |
708 | DPRINT_ERR(STORVSC_DRV, "scmnd (%p) - unable to allocate storvsc_cmd_request...marking queue busy", scmnd); | |
709 | ||
710 | scmnd->scsi_done = NULL; | |
711 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
712 | } | |
713 | ||
454f18a9 | 714 | /* Setup the cmd request */ |
bef4a34a HJ |
715 | cmd_request->bounce_sgl_count = 0; |
716 | cmd_request->bounce_sgl = NULL; | |
717 | cmd_request->cmd = scmnd; | |
718 | ||
719 | scmnd->host_scribble = (unsigned char*)cmd_request; | |
720 | ||
721 | request = &cmd_request->request; | |
722 | ||
723 | request->Extension = (void*)((unsigned long)cmd_request + request_size); | |
724 | DPRINT_DBG(STORVSC_DRV, "req %p size %d ext %d", request, request_size, storvsc_drv_obj->RequestExtSize); | |
725 | ||
454f18a9 | 726 | /* Build the SRB */ |
bef4a34a HJ |
727 | switch(scmnd->sc_data_direction) |
728 | { | |
729 | case DMA_TO_DEVICE: | |
730 | request->Type = WRITE_TYPE; | |
731 | break; | |
732 | case DMA_FROM_DEVICE: | |
733 | request->Type = READ_TYPE; | |
734 | break; | |
735 | default: | |
736 | request->Type = UNKNOWN_TYPE; | |
737 | break; | |
738 | } | |
739 | ||
740 | request->OnIOCompletion = storvsc_commmand_completion; | |
454f18a9 | 741 | request->Context = cmd_request;/* scmnd; */ |
bef4a34a | 742 | |
454f18a9 | 743 | /* request->PortId = scmnd->device->channel; */ |
bef4a34a HJ |
744 | request->Host = host_device_ctx->port; |
745 | request->Bus = scmnd->device->channel; | |
746 | request->TargetId = scmnd->device->id; | |
747 | request->LunId = scmnd->device->lun; | |
748 | ||
749 | ASSERT(scmnd->cmd_len <= 16); | |
750 | request->CdbLen = scmnd->cmd_len; | |
751 | request->Cdb = scmnd->cmnd; | |
752 | ||
753 | request->SenseBuffer = scmnd->sense_buffer; | |
754 | request->SenseBufferSize = SCSI_SENSE_BUFFERSIZE; | |
755 | ||
756 | ||
bef4a34a HJ |
757 | request->DataBuffer.Length = scsi_bufflen(scmnd); |
758 | if (scsi_sg_count(scmnd)) | |
bef4a34a | 759 | { |
bef4a34a | 760 | sgl = (struct scatterlist*)scsi_sglist(scmnd); |
bef4a34a | 761 | |
454f18a9 | 762 | /* check if we need to bounce the sgl */ |
bef4a34a | 763 | if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1) |
bef4a34a HJ |
764 | { |
765 | DPRINT_INFO(STORVSC_DRV, "need to bounce buffer for this scmnd %p", scmnd); | |
bef4a34a | 766 | cmd_request->bounce_sgl = create_bounce_buffer(sgl, scsi_sg_count(scmnd), scsi_bufflen(scmnd)); |
bef4a34a HJ |
767 | if (!cmd_request->bounce_sgl) |
768 | { | |
769 | DPRINT_ERR(STORVSC_DRV, "unable to create bounce buffer for this scmnd %p", scmnd); | |
770 | ||
771 | scmnd->scsi_done = NULL; | |
772 | scmnd->host_scribble = NULL; | |
773 | kmem_cache_free(host_device_ctx->request_pool, cmd_request); | |
774 | ||
775 | return SCSI_MLQUEUE_HOST_BUSY; | |
776 | } | |
777 | ||
bef4a34a | 778 | cmd_request->bounce_sgl_count = ALIGN_UP(scsi_bufflen(scmnd), PAGE_SIZE) >> PAGE_SHIFT; |
bef4a34a | 779 | |
454f18a9 BP |
780 | /* printk("bouncing buffer allocated %p original buffer %p\n", bounce_sgl, sgl); */ |
781 | /* printk("copy_to_bounce_buffer\n"); */ | |
782 | /* FIXME: We can optimize on reads by just skipping this */ | |
bef4a34a | 783 | copy_to_bounce_buffer(sgl, cmd_request->bounce_sgl, scsi_sg_count(scmnd)); |
bef4a34a HJ |
784 | |
785 | sgl = cmd_request->bounce_sgl; | |
786 | } | |
787 | ||
788 | request->DataBuffer.Offset = sgl[0].offset; | |
789 | ||
bef4a34a | 790 | for (i = 0; i < scsi_sg_count(scmnd); i++ ) |
bef4a34a HJ |
791 | { |
792 | DPRINT_DBG(STORVSC_DRV, "sgl[%d] len %d offset %d \n", i, sgl[i].length, sgl[i].offset); | |
bef4a34a | 793 | request->DataBuffer.PfnArray[i] = page_to_pfn(sg_page((&sgl[i]))); |
bef4a34a HJ |
794 | } |
795 | } | |
796 | ||
bef4a34a HJ |
797 | else if (scsi_sglist(scmnd)) |
798 | { | |
799 | ASSERT(scsi_bufflen(scmnd) <= PAGE_SIZE); | |
800 | request->DataBuffer.Offset = virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1); | |
801 | request->DataBuffer.PfnArray[0] = virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT; | |
802 | } | |
803 | else | |
804 | { | |
805 | ASSERT(scsi_bufflen(scmnd) == 0); | |
806 | } | |
bef4a34a HJ |
807 | |
808 | retry_request: | |
809 | ||
454f18a9 | 810 | /* Invokes the vsc to start an IO */ |
bef4a34a | 811 | ret = storvsc_drv_obj->OnIORequest(&device_ctx->device_obj, &cmd_request->request); |
454f18a9 | 812 | if (ret == -1) /* no more space */ |
bef4a34a HJ |
813 | { |
814 | DPRINT_ERR(STORVSC_DRV, "scmnd (%p) - queue FULL...marking queue busy", scmnd); | |
815 | ||
816 | if (cmd_request->bounce_sgl_count) | |
817 | { | |
454f18a9 | 818 | /* FIXME: We can optimize on writes by just skipping this */ |
bef4a34a | 819 | copy_from_bounce_buffer(scsi_sglist(scmnd), cmd_request->bounce_sgl, scsi_sg_count(scmnd)); |
bef4a34a HJ |
820 | destroy_bounce_buffer(cmd_request->bounce_sgl, cmd_request->bounce_sgl_count); |
821 | } | |
822 | ||
823 | kmem_cache_free(host_device_ctx->request_pool, cmd_request); | |
824 | ||
825 | scmnd->scsi_done = NULL; | |
826 | scmnd->host_scribble = NULL; | |
827 | ||
828 | ret = SCSI_MLQUEUE_DEVICE_BUSY; | |
829 | } | |
830 | ||
831 | DPRINT_EXIT(STORVSC_DRV); | |
832 | ||
833 | return ret; | |
834 | } | |
835 | ||
bef4a34a HJ |
836 | static int storvsc_merge_bvec(struct request_queue *q, struct bvec_merge_data *bmd, struct bio_vec *bvec) |
837 | { | |
454f18a9 | 838 | return bvec->bv_len; /* checking done by caller. */ |
bef4a34a | 839 | } |
bef4a34a HJ |
840 | |
841 | /*++ | |
842 | ||
843 | Name: storvsc_device_configure() | |
844 | ||
845 | Desc: Configure the specified scsi device | |
846 | ||
847 | --*/ | |
848 | static int storvsc_device_alloc(struct scsi_device *sdevice) | |
849 | { | |
bef4a34a | 850 | DPRINT_DBG(STORVSC_DRV, "sdev (%p) - setting device flag to %d", sdevice, BLIST_SPARSELUN); |
454f18a9 | 851 | /* This enables luns to be located sparsely. Otherwise, we may not discovered them. */ |
bef4a34a | 852 | sdevice->sdev_bflags |= BLIST_SPARSELUN | BLIST_LARGELUN; |
bef4a34a HJ |
853 | return 0; |
854 | } | |
855 | ||
856 | static int storvsc_device_configure(struct scsi_device *sdevice) | |
857 | { | |
858 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) - curr queue depth %d", sdevice, sdevice->queue_depth); | |
859 | ||
860 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) - setting queue depth to %d", sdevice, STORVSC_MAX_IO_REQUESTS); | |
861 | scsi_adjust_queue_depth(sdevice, MSG_SIMPLE_TAG, STORVSC_MAX_IO_REQUESTS); | |
862 | ||
2701f686 | 863 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) - setting max segment size to %ld", sdevice, PAGE_SIZE); |
bef4a34a HJ |
864 | blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE); |
865 | ||
866 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) - adding merge bio vec routine", sdevice); | |
867 | blk_queue_merge_bvec(sdevice->request_queue, storvsc_merge_bvec); | |
868 | ||
869 | blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY); | |
454f18a9 | 870 | /* sdevice->timeout = (2000 * HZ);//(75 * HZ); */ |
bef4a34a HJ |
871 | |
872 | return 0; | |
873 | } | |
874 | ||
875 | /*++ | |
876 | ||
877 | Name: storvsc_host_reset_handler() | |
878 | ||
879 | Desc: Reset the scsi HBA | |
880 | ||
881 | --*/ | |
882 | static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd) | |
883 | { | |
884 | int ret=SUCCESS; | |
885 | struct host_device_context *host_device_ctx = (struct host_device_context*)scmnd->device->host->hostdata; | |
886 | struct device_context *device_ctx = host_device_ctx->device_ctx; | |
887 | struct driver_context *driver_ctx = driver_to_driver_context(device_ctx->device.driver); | |
888 | struct storvsc_driver_context *storvsc_drv_ctx = (struct storvsc_driver_context*)driver_ctx; | |
889 | ||
9f0c7d2c | 890 | struct storvsc_driver_object *storvsc_drv_obj = &storvsc_drv_ctx->drv_obj; |
bef4a34a HJ |
891 | |
892 | DPRINT_ENTER(STORVSC_DRV); | |
893 | ||
894 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) dev obj (%p) - host resetting...", scmnd->device, &device_ctx->device_obj); | |
895 | ||
454f18a9 | 896 | /* Invokes the vsc to reset the host/bus */ |
bef4a34a HJ |
897 | ASSERT(storvsc_drv_obj->OnHostReset); |
898 | ret = storvsc_drv_obj->OnHostReset(&device_ctx->device_obj); | |
899 | if (ret != 0) | |
900 | { | |
901 | DPRINT_EXIT(STORVSC_DRV); | |
902 | return ret; | |
903 | } | |
904 | ||
905 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) dev obj (%p) - host reseted", scmnd->device, &device_ctx->device_obj); | |
906 | ||
907 | DPRINT_EXIT(STORVSC_DRV); | |
908 | ||
909 | return ret; | |
910 | } | |
911 | ||
912 | /*++ | |
913 | ||
914 | Name: storvsc_host_rescan | |
915 | ||
916 | Desc: Rescan the scsi HBA | |
917 | ||
918 | --*/ | |
bef4a34a HJ |
919 | static void storvsc_host_rescan_callback(struct work_struct *work) |
920 | { | |
3d3b5518 | 921 | struct hv_device *device_obj = |
bef4a34a | 922 | &((struct host_device_context*)work)->device_ctx->device_obj; |
bef4a34a | 923 | struct device_context* device_ctx = to_device_context(device_obj); |
0883c52b | 924 | struct Scsi_Host *host = dev_get_drvdata(&device_ctx->device); |
bef4a34a HJ |
925 | struct scsi_device *sdev; |
926 | struct host_device_context *host_device_ctx; | |
927 | struct scsi_device **sdevs_remove_list; | |
928 | unsigned int sdevs_count=0; | |
929 | unsigned int found; | |
930 | unsigned int i; | |
931 | unsigned int lun_count=0; | |
932 | unsigned int *lun_list; | |
933 | ||
934 | DPRINT_ENTER(STORVSC_DRV); | |
935 | ||
936 | host_device_ctx = (struct host_device_context*)host->hostdata; | |
06da0bc8 | 937 | lun_list = kcalloc(STORVSC_MAX_LUNS_PER_TARGET, sizeof(unsigned int), GFP_ATOMIC); |
bef4a34a HJ |
938 | if (!lun_list) |
939 | { | |
940 | DPRINT_ERR(STORVSC_DRV, "unable to allocate lun list"); | |
941 | return; | |
942 | } | |
943 | ||
06da0bc8 | 944 | sdevs_remove_list = kcalloc(STORVSC_MAX_LUNS_PER_TARGET, sizeof(void *), GFP_ATOMIC); |
bef4a34a HJ |
945 | if (!sdevs_remove_list) |
946 | { | |
947 | kfree(lun_list); | |
948 | DPRINT_ERR(STORVSC_DRV, "unable to allocate lun remove list"); | |
949 | return; | |
950 | } | |
951 | ||
7f6f27d6 | 952 | DPRINT_INFO(STORVSC_DRV, "rescanning host for new scsi devices..."); |
bef4a34a | 953 | |
454f18a9 | 954 | /* Rescan for new device */ |
bef4a34a HJ |
955 | scsi_scan_target(&host->shost_gendev, host_device_ctx->path, host_device_ctx->target, SCAN_WILD_CARD, 1); |
956 | ||
957 | DPRINT_INFO(STORVSC_DRV, "rescanning host for removed scsi device..."); | |
958 | ||
454f18a9 | 959 | /* Use the 1st device to send the report luns cmd */ |
bef4a34a HJ |
960 | shost_for_each_device(sdev, host) |
961 | { | |
962 | lun_count=STORVSC_MAX_LUNS_PER_TARGET; | |
963 | storvsc_report_luns(sdev, lun_list, &lun_count); | |
964 | ||
965 | DPRINT_INFO(STORVSC_DRV, "report luns on scsi device (%p) found %u luns ", sdev, lun_count); | |
966 | DPRINT_INFO(STORVSC_DRV, "existing luns on scsi device (%p) host (%d)", sdev, host->host_no); | |
967 | ||
968 | scsi_device_put(sdev); | |
969 | break; | |
970 | } | |
971 | ||
972 | for (i=0; i<lun_count; i++) | |
973 | { | |
974 | DPRINT_INFO(STORVSC_DRV, "%d) lun %u", i, lun_list[i]); | |
975 | } | |
976 | ||
454f18a9 BP |
977 | /* Rescan for devices that may have been removed. */ |
978 | /* We do not have to worry that new devices may have been added since */ | |
979 | /* this callback is serialized by the workqueue ie add/remove are done here. */ | |
bef4a34a HJ |
980 | shost_for_each_device(sdev, host) |
981 | { | |
454f18a9 | 982 | /* See if this device is still here */ |
bef4a34a HJ |
983 | found = 0; |
984 | for (i=0; i<lun_count; i++) | |
985 | { | |
986 | if (sdev->lun == lun_list[i]) | |
987 | { | |
988 | found = 1; | |
989 | break; | |
990 | } | |
991 | } | |
992 | if (!found) | |
993 | { | |
994 | DPRINT_INFO(STORVSC_DRV, "lun (%u) does not exists", sdev->lun); | |
995 | sdevs_remove_list[sdevs_count++] = sdev; | |
996 | } | |
997 | } | |
998 | ||
454f18a9 | 999 | /* Now remove the devices */ |
bef4a34a HJ |
1000 | for (i=0; i< sdevs_count; i++) |
1001 | { | |
1002 | DPRINT_INFO(STORVSC_DRV, "removing scsi device (%p) lun (%u)...", | |
1003 | sdevs_remove_list[i], sdevs_remove_list[i]->lun); | |
1004 | ||
454f18a9 | 1005 | /* make sure it is not removed from underneath us */ |
bef4a34a HJ |
1006 | if (!scsi_device_get(sdevs_remove_list[i])) |
1007 | { | |
1008 | scsi_remove_device(sdevs_remove_list[i]); | |
1009 | scsi_device_put(sdevs_remove_list[i]); | |
1010 | } | |
1011 | } | |
1012 | ||
1013 | DPRINT_INFO(STORVSC_DRV, "rescan completed on dev obj (%p) target (%u) bus (%u)", device_obj, host_device_ctx->target, host_device_ctx->path); | |
1014 | ||
1015 | kfree(lun_list); | |
1016 | kfree(sdevs_remove_list); | |
1017 | ||
1018 | DPRINT_EXIT(STORVSC_DRV); | |
1019 | } | |
1020 | ||
1021 | static int storvsc_report_luns(struct scsi_device *sdev, unsigned int luns[], unsigned int *lun_count) | |
1022 | { | |
1023 | int i,j; | |
1024 | unsigned int lun=0; | |
1025 | unsigned int num_luns; | |
1026 | int result; | |
1027 | unsigned char *data; | |
bef4a34a | 1028 | struct scsi_sense_hdr sshdr; |
bef4a34a | 1029 | unsigned char cmd[16]={0}; |
454f18a9 | 1030 | unsigned int report_len = 8*(STORVSC_MAX_LUNS_PER_TARGET+1); /* Add 1 to cover the report_lun header */ |
bef4a34a HJ |
1031 | unsigned long long *report_luns; |
1032 | const unsigned int in_lun_count = *lun_count; | |
1033 | ||
1034 | *lun_count = 0; | |
1035 | ||
1036 | report_luns = kzalloc(report_len, GFP_ATOMIC); | |
1037 | if (!report_luns) | |
1038 | { | |
1039 | return -ENOMEM; | |
1040 | } | |
1041 | ||
1042 | cmd[0] = REPORT_LUNS; | |
1043 | ||
454f18a9 | 1044 | /* cmd length */ |
bef4a34a HJ |
1045 | *(unsigned int*)&cmd[6] = cpu_to_be32(report_len); |
1046 | ||
97f4ee3d | 1047 | result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, (unsigned char*)report_luns, report_len, &sshdr, 30*HZ, 3, NULL); |
bef4a34a HJ |
1048 | if (result != 0) |
1049 | { | |
1050 | kfree(report_luns); | |
1051 | return -EBUSY; | |
1052 | } | |
1053 | ||
454f18a9 | 1054 | /* get the length from the first four bytes */ |
bef4a34a HJ |
1055 | report_len = be32_to_cpu(*(unsigned int*)&report_luns[0]); |
1056 | ||
1057 | num_luns = (report_len / sizeof(unsigned long long)); | |
1058 | if (num_luns > in_lun_count) | |
1059 | { | |
1060 | kfree(report_luns); | |
1061 | return -EINVAL; | |
1062 | } | |
1063 | ||
1064 | *lun_count = num_luns; | |
1065 | ||
1066 | DPRINT_DBG(STORVSC_DRV, "report luns on scsi device (%p) found %u luns ", sdev, num_luns); | |
1067 | ||
454f18a9 | 1068 | /* lun id starts at 1 */ |
bef4a34a HJ |
1069 | for (i=1; i< num_luns+1; i++) |
1070 | { | |
1071 | lun = 0; | |
1072 | data = (unsigned char*)&report_luns[i]; | |
1073 | for (j = 0; j < sizeof(lun); j += 2) | |
1074 | { | |
1075 | lun = lun | (((data[j] << 8) | data[j + 1]) << (j * 8)); | |
1076 | } | |
1077 | ||
1078 | luns[i-1] = lun; | |
1079 | } | |
1080 | ||
1081 | kfree(report_luns); | |
1082 | return 0; | |
1083 | } | |
bef4a34a | 1084 | |
3d3b5518 | 1085 | static void storvsc_host_rescan(struct hv_device *device_obj) |
bef4a34a HJ |
1086 | { |
1087 | struct device_context* device_ctx = to_device_context(device_obj); | |
0883c52b | 1088 | struct Scsi_Host *host = dev_get_drvdata(&device_ctx->device); |
bef4a34a HJ |
1089 | struct host_device_context *host_device_ctx; |
1090 | ||
1091 | DPRINT_ENTER(STORVSC_DRV); | |
bef4a34a HJ |
1092 | |
1093 | host_device_ctx = (struct host_device_context*)host->hostdata; | |
1094 | ||
1095 | DPRINT_INFO(STORVSC_DRV, "initiating rescan on dev obj (%p) target (%u) bus (%u)...", device_obj, host_device_ctx->target, host_device_ctx->path); | |
1096 | ||
454f18a9 BP |
1097 | /* We need to queue this since the scanning may block and the caller may be in an intr context */ |
1098 | /* scsi_queue_work(host, &host_device_ctx->host_rescan_work); */ | |
bef4a34a | 1099 | schedule_work(&host_device_ctx->host_rescan_work); |
bef4a34a HJ |
1100 | DPRINT_EXIT(STORVSC_DRV); |
1101 | } | |
1102 | ||
1103 | static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, sector_t capacity, int *info) | |
1104 | { | |
1105 | sector_t total_sectors = capacity; | |
1106 | sector_t cylinder_times_heads=0; | |
1107 | sector_t temp=0; | |
1108 | ||
1109 | int sectors_per_track=0; | |
1110 | int heads=0; | |
1111 | int cylinders=0; | |
1112 | int rem=0; | |
1113 | ||
1114 | if (total_sectors > (65535 * 16 * 255)) { | |
1115 | total_sectors = (65535 * 16 * 255); | |
1116 | } | |
1117 | ||
1118 | if (total_sectors >= (65535 * 16 * 63)) { | |
1119 | sectors_per_track = 255; | |
1120 | heads = 16; | |
1121 | ||
1122 | cylinder_times_heads = total_sectors; | |
454f18a9 | 1123 | rem = sector_div(cylinder_times_heads, sectors_per_track); /* sector_div stores the quotient in cylinder_times_heads */ |
bef4a34a HJ |
1124 | } |
1125 | else | |
1126 | { | |
1127 | sectors_per_track = 17; | |
1128 | ||
1129 | cylinder_times_heads = total_sectors; | |
454f18a9 | 1130 | rem = sector_div(cylinder_times_heads, sectors_per_track); /* sector_div stores the quotient in cylinder_times_heads */ |
bef4a34a HJ |
1131 | |
1132 | temp = cylinder_times_heads + 1023; | |
454f18a9 | 1133 | rem = sector_div(temp, 1024); /* sector_div stores the quotient in temp */ |
bef4a34a HJ |
1134 | |
1135 | heads = temp; | |
1136 | ||
1137 | if (heads < 4) { | |
1138 | heads = 4; | |
1139 | } | |
1140 | ||
1141 | if (cylinder_times_heads >= (heads * 1024) || (heads > 16)) { | |
1142 | sectors_per_track = 31; | |
1143 | heads = 16; | |
1144 | ||
1145 | cylinder_times_heads = total_sectors; | |
454f18a9 | 1146 | rem = sector_div(cylinder_times_heads, sectors_per_track); /* sector_div stores the quotient in cylinder_times_heads */ |
bef4a34a HJ |
1147 | } |
1148 | ||
1149 | if (cylinder_times_heads >= (heads * 1024)) { | |
1150 | sectors_per_track = 63; | |
1151 | heads = 16; | |
1152 | ||
1153 | cylinder_times_heads = total_sectors; | |
454f18a9 | 1154 | rem = sector_div(cylinder_times_heads, sectors_per_track); /* sector_div stores the quotient in cylinder_times_heads */ |
bef4a34a HJ |
1155 | } |
1156 | } | |
1157 | ||
1158 | temp = cylinder_times_heads; | |
454f18a9 | 1159 | rem = sector_div(temp, heads); /* sector_div stores the quotient in temp */ |
bef4a34a HJ |
1160 | cylinders = temp; |
1161 | ||
1162 | info[0] = heads; | |
1163 | info[1] = sectors_per_track; | |
1164 | info[2] = cylinders; | |
1165 | ||
1166 | DPRINT_INFO(STORVSC_DRV, "CHS (%d, %d, %d)", cylinders, heads, sectors_per_track); | |
1167 | ||
1168 | return 0; | |
1169 | } | |
1170 | ||
1171 | MODULE_LICENSE("GPL"); | |
1172 | ||
1173 | static int __init storvsc_init(void) | |
1174 | { | |
1175 | int ret; | |
1176 | ||
1177 | DPRINT_ENTER(STORVSC_DRV); | |
1178 | ||
1179 | DPRINT_INFO(STORVSC_DRV, "Storvsc initializing...."); | |
1180 | ||
1181 | ret = storvsc_drv_init(StorVscInitialize); | |
1182 | ||
1183 | DPRINT_EXIT(STORVSC_DRV); | |
1184 | ||
1185 | return ret; | |
1186 | } | |
1187 | ||
1188 | static void __exit storvsc_exit(void) | |
1189 | { | |
1190 | DPRINT_ENTER(STORVSC_DRV); | |
1191 | ||
1192 | storvsc_drv_exit(); | |
1193 | ||
1194 | DPRINT_ENTER(STORVSC_DRV); | |
1195 | } | |
1196 | ||
1197 | module_param(storvsc_ringbuffer_size, int, S_IRUGO); | |
1198 | ||
1199 | module_init(storvsc_init); | |
1200 | module_exit(storvsc_exit); | |
1201 | ||
454f18a9 | 1202 | /* eof */ |