[net-next-2.6.git] / drivers / gpu / drm / ttm / ttm_memory.c

/**************************************************************************
 *
 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sub license, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
 * USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 **************************************************************************/

#include "ttm/ttm_memory.h"
#include "ttm/ttm_module.h"
#include <linux/spinlock.h>
#include <linux/sched.h>
#include <linux/wait.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/slab.h>

#define TTM_MEMORY_ALLOC_RETRIES 4

struct ttm_mem_zone {
	struct kobject kobj;
	struct ttm_mem_global *glob;
	const char *name;
	uint64_t zone_mem;
	uint64_t emer_mem;
	uint64_t max_mem;
	uint64_t swap_limit;
	uint64_t used_mem;
};

static struct attribute ttm_mem_sys = {
	.name = "zone_memory",
	.mode = S_IRUGO
};
static struct attribute ttm_mem_emer = {
	.name = "emergency_memory",
	.mode = S_IRUGO | S_IWUSR
};
static struct attribute ttm_mem_max = {
	.name = "available_memory",
	.mode = S_IRUGO | S_IWUSR
};
static struct attribute ttm_mem_swap = {
	.name = "swap_limit",
	.mode = S_IRUGO | S_IWUSR
};
static struct attribute ttm_mem_used = {
	.name = "used_memory",
	.mode = S_IRUGO
};

static void ttm_mem_zone_kobj_release(struct kobject *kobj)
{
	struct ttm_mem_zone *zone =
		container_of(kobj, struct ttm_mem_zone, kobj);

	printk(KERN_INFO TTM_PFX
	       "Zone %7s: Used memory at exit: %llu kiB.\n",
	       zone->name, (unsigned long long) zone->used_mem >> 10);
	kfree(zone);
}

static ssize_t ttm_mem_zone_show(struct kobject *kobj,
				 struct attribute *attr,
				 char *buffer)
{
	struct ttm_mem_zone *zone =
		container_of(kobj, struct ttm_mem_zone, kobj);
	uint64_t val = 0;

	spin_lock(&zone->glob->lock);
	if (attr == &ttm_mem_sys)
		val = zone->zone_mem;
	else if (attr == &ttm_mem_emer)
		val = zone->emer_mem;
	else if (attr == &ttm_mem_max)
		val = zone->max_mem;
	else if (attr == &ttm_mem_swap)
		val = zone->swap_limit;
	else if (attr == &ttm_mem_used)
		val = zone->used_mem;
	spin_unlock(&zone->glob->lock);

	return snprintf(buffer, PAGE_SIZE, "%llu\n",
			(unsigned long long) val >> 10);
}

static void ttm_check_swapping(struct ttm_mem_global *glob);

static ssize_t ttm_mem_zone_store(struct kobject *kobj,
				  struct attribute *attr,
				  const char *buffer,
				  size_t size)
{
	struct ttm_mem_zone *zone =
		container_of(kobj, struct ttm_mem_zone, kobj);
	int chars;
	unsigned long val;
	uint64_t val64;

	chars = sscanf(buffer, "%lu", &val);
	if (chars == 0)
		return size;

	val64 = val;
	val64 <<= 10;

	spin_lock(&zone->glob->lock);
	if (val64 > zone->zone_mem)
		val64 = zone->zone_mem;
	if (attr == &ttm_mem_emer) {
		zone->emer_mem = val64;
		if (zone->max_mem > val64)
			zone->max_mem = val64;
	} else if (attr == &ttm_mem_max) {
		zone->max_mem = val64;
		if (zone->emer_mem < val64)
			zone->emer_mem = val64;
	} else if (attr == &ttm_mem_swap)
		zone->swap_limit = val64;
	spin_unlock(&zone->glob->lock);

	ttm_check_swapping(zone->glob);

	return size;
}

static struct attribute *ttm_mem_zone_attrs[] = {
	&ttm_mem_sys,
	&ttm_mem_emer,
	&ttm_mem_max,
	&ttm_mem_swap,
	&ttm_mem_used,
	NULL
};

static const struct sysfs_ops ttm_mem_zone_ops = {
	.show = &ttm_mem_zone_show,
	.store = &ttm_mem_zone_store
};

static struct kobj_type ttm_mem_zone_kobj_type = {
	.release = &ttm_mem_zone_kobj_release,
	.sysfs_ops = &ttm_mem_zone_ops,
	.default_attrs = ttm_mem_zone_attrs,
};

static void ttm_mem_global_kobj_release(struct kobject *kobj)
{
	struct ttm_mem_global *glob =
		container_of(kobj, struct ttm_mem_global, kobj);

	kfree(glob);
}

static struct kobj_type ttm_mem_glob_kobj_type = {
	.release = &ttm_mem_global_kobj_release,
};

static bool ttm_zones_above_swap_target(struct ttm_mem_global *glob,
					bool from_wq, uint64_t extra)
{
	unsigned int i;
	struct ttm_mem_zone *zone;
	uint64_t target;

	for (i = 0; i < glob->num_zones; ++i) {
		zone = glob->zones[i];

		if (from_wq)
			target = zone->swap_limit;
		else if (capable(CAP_SYS_ADMIN))
			target = zone->emer_mem;
		else
			target = zone->max_mem;

		target = (extra > target) ? 0ULL : target;

		if (zone->used_mem > target)
			return true;
	}
	return false;
}

/**
 * At this point we only support a single shrink callback.
 * Extend this if needed, perhaps using a linked list of callbacks.
 * Note that this function is reentrant:
 * many threads may try to swap out at any given time.
 */

static void ttm_shrink(struct ttm_mem_global *glob, bool from_wq,
		       uint64_t extra)
{
	int ret;
	struct ttm_mem_shrink *shrink;

	spin_lock(&glob->lock);
	if (glob->shrink == NULL)
		goto out;

	while (ttm_zones_above_swap_target(glob, from_wq, extra)) {
		shrink = glob->shrink;
		spin_unlock(&glob->lock);
		ret = shrink->do_shrink(shrink);
		spin_lock(&glob->lock);
		if (unlikely(ret != 0))
			goto out;
	}
out:
	spin_unlock(&glob->lock);
}


static void ttm_shrink_work(struct work_struct *work)
{
	struct ttm_mem_global *glob =
	    container_of(work, struct ttm_mem_global, work);

	ttm_shrink(glob, true, 0ULL);
}

static int ttm_mem_init_kernel_zone(struct ttm_mem_global *glob,
				    const struct sysinfo *si)
{
	struct ttm_mem_zone *zone = kzalloc(sizeof(*zone), GFP_KERNEL);
	uint64_t mem;
	int ret;

	if (unlikely(!zone))
		return -ENOMEM;

	mem = si->totalram - si->totalhigh;
	mem *= si->mem_unit;

	zone->name = "kernel";
	zone->zone_mem = mem;
	zone->max_mem = mem >> 1;
	zone->emer_mem = (mem >> 1) + (mem >> 2);
	zone->swap_limit = zone->max_mem - (mem >> 3);
	zone->used_mem = 0;
	zone->glob = glob;
	glob->zone_kernel = zone;
	kobject_init(&zone->kobj, &ttm_mem_zone_kobj_type);
	ret = kobject_add(&zone->kobj, &glob->kobj, zone->name);
	if (unlikely(ret != 0)) {
		kobject_put(&zone->kobj);
		return ret;
	}
	glob->zones[glob->num_zones++] = zone;
	return 0;
}

#ifdef CONFIG_HIGHMEM
static int ttm_mem_init_highmem_zone(struct ttm_mem_global *glob,
				     const struct sysinfo *si)
{
	struct ttm_mem_zone *zone;
	uint64_t mem;
	int ret;

	if (si->totalhigh == 0)
		return 0;

	zone = kzalloc(sizeof(*zone), GFP_KERNEL);
	if (unlikely(!zone))
		return -ENOMEM;

	mem = si->totalram;
	mem *= si->mem_unit;

	zone->name = "highmem";
	zone->zone_mem = mem;
	zone->max_mem = mem >> 1;
	zone->emer_mem = (mem >> 1) + (mem >> 2);
	zone->swap_limit = zone->max_mem - (mem >> 3);
	zone->used_mem = 0;
	zone->glob = glob;
	glob->zone_highmem = zone;
	kobject_init(&zone->kobj, &ttm_mem_zone_kobj_type);
	ret = kobject_add(&zone->kobj, &glob->kobj, zone->name);
	if (unlikely(ret != 0)) {
		kobject_put(&zone->kobj);
		return ret;
	}
	glob->zones[glob->num_zones++] = zone;
	return 0;
}
#else
static int ttm_mem_init_dma32_zone(struct ttm_mem_global *glob,
				   const struct sysinfo *si)
{
	struct ttm_mem_zone *zone = kzalloc(sizeof(*zone), GFP_KERNEL);
	uint64_t mem;
	int ret;

	if (unlikely(!zone))
		return -ENOMEM;

	mem = si->totalram;
	mem *= si->mem_unit;

	/**
	 * No special dma32 zone needed.
	 */

	if (mem <= ((uint64_t) 1ULL << 32)) {
		kfree(zone);
		return 0;
	}

	/*
	 * Limit max dma32 memory to 4GB for now
	 * until we can figure out how big this
	 * zone really is.
	 */

	mem = ((uint64_t) 1ULL << 32);
	zone->name = "dma32";
	zone->zone_mem = mem;
	zone->max_mem = mem >> 1;
	zone->emer_mem = (mem >> 1) + (mem >> 2);
	zone->swap_limit = zone->max_mem - (mem >> 3);
	zone->used_mem = 0;
	zone->glob = glob;
	glob->zone_dma32 = zone;
	kobject_init(&zone->kobj, &ttm_mem_zone_kobj_type);
	ret = kobject_add(&zone->kobj, &glob->kobj, zone->name);
	if (unlikely(ret != 0)) {
		kobject_put(&zone->kobj);
		return ret;
	}
	glob->zones[glob->num_zones++] = zone;
	return 0;
}
#endif

int ttm_mem_global_init(struct ttm_mem_global *glob)
{
	struct sysinfo si;
	int ret;
	int i;
	struct ttm_mem_zone *zone;

	spin_lock_init(&glob->lock);
	glob->swap_queue = create_singlethread_workqueue("ttm_swap");
	INIT_WORK(&glob->work, ttm_shrink_work);
	init_waitqueue_head(&glob->queue);
	kobject_init(&glob->kobj, &ttm_mem_glob_kobj_type);
	ret = kobject_add(&glob->kobj,
			  ttm_get_kobj(),
			  "memory_accounting");
	if (unlikely(ret != 0)) {
		kobject_put(&glob->kobj);
		return ret;
	}

	si_meminfo(&si);

	ret = ttm_mem_init_kernel_zone(glob, &si);
	if (unlikely(ret != 0))
		goto out_no_zone;
#ifdef CONFIG_HIGHMEM
	ret = ttm_mem_init_highmem_zone(glob, &si);
	if (unlikely(ret != 0))
		goto out_no_zone;
#else
	ret = ttm_mem_init_dma32_zone(glob, &si);
	if (unlikely(ret != 0))
		goto out_no_zone;
#endif
	for (i = 0; i < glob->num_zones; ++i) {
		zone = glob->zones[i];
		printk(KERN_INFO TTM_PFX
		       "Zone %7s: Available graphics memory: %llu kiB.\n",
		       zone->name, (unsigned long long) zone->max_mem >> 10);
	}
	return 0;
out_no_zone:
	ttm_mem_global_release(glob);
	return ret;
}
EXPORT_SYMBOL(ttm_mem_global_init);

void ttm_mem_global_release(struct ttm_mem_global *glob)
{
	unsigned int i;
	struct ttm_mem_zone *zone;

	flush_workqueue(glob->swap_queue);
	destroy_workqueue(glob->swap_queue);
	glob->swap_queue = NULL;
	for (i = 0; i < glob->num_zones; ++i) {
		zone = glob->zones[i];
		kobject_del(&zone->kobj);
		kobject_put(&zone->kobj);
	}
	kobject_del(&glob->kobj);
	kobject_put(&glob->kobj);
}
EXPORT_SYMBOL(ttm_mem_global_release);

static void ttm_check_swapping(struct ttm_mem_global *glob)
{
	bool needs_swapping = false;
	unsigned int i;
	struct ttm_mem_zone *zone;

	spin_lock(&glob->lock);
	for (i = 0; i < glob->num_zones; ++i) {
		zone = glob->zones[i];
		if (zone->used_mem > zone->swap_limit) {
			needs_swapping = true;
			break;
		}
	}

	spin_unlock(&glob->lock);

	if (unlikely(needs_swapping))
		(void)queue_work(glob->swap_queue, &glob->work);

}

static void ttm_mem_global_free_zone(struct ttm_mem_global *glob,
				     struct ttm_mem_zone *single_zone,
				     uint64_t amount)
{
	unsigned int i;
	struct ttm_mem_zone *zone;

	spin_lock(&glob->lock);
	for (i = 0; i < glob->num_zones; ++i) {
		zone = glob->zones[i];
		if (single_zone && zone != single_zone)
			continue;
		zone->used_mem -= amount;
	}
	spin_unlock(&glob->lock);
}

void ttm_mem_global_free(struct ttm_mem_global *glob,
			 uint64_t amount)
{
	return ttm_mem_global_free_zone(glob, NULL, amount);
}
EXPORT_SYMBOL(ttm_mem_global_free);

static int ttm_mem_global_reserve(struct ttm_mem_global *glob,
				  struct ttm_mem_zone *single_zone,
				  uint64_t amount, bool reserve)
{
	uint64_t limit;
	int ret = -ENOMEM;
	unsigned int i;
	struct ttm_mem_zone *zone;

	spin_lock(&glob->lock);
	for (i = 0; i < glob->num_zones; ++i) {
		zone = glob->zones[i];
		if (single_zone && zone != single_zone)
			continue;

		limit = (capable(CAP_SYS_ADMIN)) ?
			zone->emer_mem : zone->max_mem;

		if (zone->used_mem > limit)
			goto out_unlock;
	}

	if (reserve) {
		for (i = 0; i < glob->num_zones; ++i) {
			zone = glob->zones[i];
			if (single_zone && zone != single_zone)
				continue;
			zone->used_mem += amount;
		}
	}

	ret = 0;
out_unlock:
	spin_unlock(&glob->lock);
	ttm_check_swapping(glob);

	return ret;
}


static int ttm_mem_global_alloc_zone(struct ttm_mem_global *glob,
				     struct ttm_mem_zone *single_zone,
				     uint64_t memory,
				     bool no_wait, bool interruptible)
{
	int count = TTM_MEMORY_ALLOC_RETRIES;

	while (unlikely(ttm_mem_global_reserve(glob,
					       single_zone,
					       memory, true)
			!= 0)) {
		if (no_wait)
			return -ENOMEM;
		if (unlikely(count-- == 0))
			return -ENOMEM;
		ttm_shrink(glob, false, memory + (memory >> 2) + 16);
	}

	return 0;
}

int ttm_mem_global_alloc(struct ttm_mem_global *glob, uint64_t memory,
			 bool no_wait, bool interruptible)
{
	/**
	 * Normal allocations of kernel memory are registered in
	 * all zones.
	 */

	return ttm_mem_global_alloc_zone(glob, NULL, memory, no_wait,
					 interruptible);
}
EXPORT_SYMBOL(ttm_mem_global_alloc);

int ttm_mem_global_alloc_page(struct ttm_mem_global *glob,
			      struct page *page,
			      bool no_wait, bool interruptible)
{

	struct ttm_mem_zone *zone = NULL;

	/**
	 * Page allocations may be registed in a single zone
	 * only if highmem or !dma32.
	 */

#ifdef CONFIG_HIGHMEM
	if (PageHighMem(page) && glob->zone_highmem != NULL)
		zone = glob->zone_highmem;
#else
	if (glob->zone_dma32 && page_to_pfn(page) > 0x00100000UL)
		zone = glob->zone_kernel;
#endif
	return ttm_mem_global_alloc_zone(glob, zone, PAGE_SIZE, no_wait,
					 interruptible);
}

void ttm_mem_global_free_page(struct ttm_mem_global *glob, struct page *page)
{
	struct ttm_mem_zone *zone = NULL;

#ifdef CONFIG_HIGHMEM
	if (PageHighMem(page) && glob->zone_highmem != NULL)
		zone = glob->zone_highmem;
#else
	if (glob->zone_dma32 && page_to_pfn(page) > 0x00100000UL)
		zone = glob->zone_kernel;
#endif
	ttm_mem_global_free_zone(glob, zone, PAGE_SIZE);
}


size_t ttm_round_pot(size_t size)
{
	if ((size & (size - 1)) == 0)
		return size;
	else if (size > PAGE_SIZE)
		return PAGE_ALIGN(size);
	else {
		size_t tmp_size = 4;

		while (tmp_size < size)
			tmp_size <<= 1;

		return tmp_size;
	}
	return 0;
}
EXPORT_SYMBOL(ttm_round_pot);
Commit	Line	Data
ba4e7d97 TH	1	/**************************************************************************
	2	*
	3	* Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
	4	* All Rights Reserved.
	5	*
	6	* Permission is hereby granted, free of charge, to any person obtaining a
	7	* copy of this software and associated documentation files (the
	8	* "Software"), to deal in the Software without restriction, including
	9	* without limitation the rights to use, copy, modify, merge, publish,
	10	* distribute, sub license, and/or sell copies of the Software, and to
	11	* permit persons to whom the Software is furnished to do so, subject to
	12	* the following conditions:
	13	*
	14	* The above copyright notice and this permission notice (including the
	15	* next paragraph) shall be included in all copies or substantial portions
	16	* of the Software.
	17	*
	18	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	19	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	20	* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
	21	* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
	22	* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
	23	* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
	24	* USE OR OTHER DEALINGS IN THE SOFTWARE.
	25	*
	26	**************************************************************************/
	27
	28	#include "ttm/ttm_memory.h"
5fd9cbad	29	#include "ttm/ttm_module.h"
ba4e7d97 TH	30	#include <linux/spinlock.h>
	31	#include <linux/sched.h>
	32	#include <linux/wait.h>
	33	#include <linux/mm.h>
	34	#include <linux/module.h>
5a0e3ad6	35	#include <linux/slab.h>
ba4e7d97	36
ba4e7d97 TH	37	#define TTM_MEMORY_ALLOC_RETRIES 4
ba4e7d97 TH	38
5fd9cbad TH	39	struct ttm_mem_zone {
	40	struct kobject kobj;
	41	struct ttm_mem_global *glob;
	42	const char *name;
	43	uint64_t zone_mem;
	44	uint64_t emer_mem;
	45	uint64_t max_mem;
	46	uint64_t swap_limit;
	47	uint64_t used_mem;
	48	};
	49
	50	static struct attribute ttm_mem_sys = {
	51	.name = "zone_memory",
	52	.mode = S_IRUGO
	53	};
	54	static struct attribute ttm_mem_emer = {
	55	.name = "emergency_memory",
	56	.mode = S_IRUGO \| S_IWUSR
	57	};
	58	static struct attribute ttm_mem_max = {
	59	.name = "available_memory",
	60	.mode = S_IRUGO \| S_IWUSR
	61	};
	62	static struct attribute ttm_mem_swap = {
	63	.name = "swap_limit",
	64	.mode = S_IRUGO \| S_IWUSR
	65	};
	66	static struct attribute ttm_mem_used = {
	67	.name = "used_memory",
	68	.mode = S_IRUGO
	69	};
	70
	71	static void ttm_mem_zone_kobj_release(struct kobject *kobj)
	72	{
	73	struct ttm_mem_zone *zone =
	74	container_of(kobj, struct ttm_mem_zone, kobj);
	75
	76	printk(KERN_INFO TTM_PFX
	77	"Zone %7s: Used memory at exit: %llu kiB.\n",
	78	zone->name, (unsigned long long) zone->used_mem >> 10);
	79	kfree(zone);
	80	}
	81
	82	static ssize_t ttm_mem_zone_show(struct kobject *kobj,
	83	struct attribute *attr,
	84	char *buffer)
	85	{
	86	struct ttm_mem_zone *zone =
	87	container_of(kobj, struct ttm_mem_zone, kobj);
	88	uint64_t val = 0;
	89
	90	spin_lock(&zone->glob->lock);
	91	if (attr == &ttm_mem_sys)
	92	val = zone->zone_mem;
	93	else if (attr == &ttm_mem_emer)
	94	val = zone->emer_mem;
	95	else if (attr == &ttm_mem_max)
	96	val = zone->max_mem;
	97	else if (attr == &ttm_mem_swap)
	98	val = zone->swap_limit;
	99	else if (attr == &ttm_mem_used)
	100	val = zone->used_mem;
	101	spin_unlock(&zone->glob->lock);
	102
103	return snprintf(buffer, PAGE_SIZE, "%llu\n",
104	(unsigned long long) val >> 10);
105	}
106
107	static void ttm_check_swapping(struct ttm_mem_global *glob);
108
109	static ssize_t ttm_mem_zone_store(struct kobject *kobj,
110	struct attribute *attr,
111	const char *buffer,
112	size_t size)
113	{
114	struct ttm_mem_zone *zone =
115	container_of(kobj, struct ttm_mem_zone, kobj);
116	int chars;
117	unsigned long val;
118	uint64_t val64;
119
120	chars = sscanf(buffer, "%lu", &val);
121	if (chars == 0)
122	return size;
123
124	val64 = val;
125	val64 <<= 10;
126
127	spin_lock(&zone->glob->lock);
128	if (val64 > zone->zone_mem)
129	val64 = zone->zone_mem;
130	if (attr == &ttm_mem_emer) {
131	zone->emer_mem = val64;
132	if (zone->max_mem > val64)
133	zone->max_mem = val64;
134	} else if (attr == &ttm_mem_max) {
135	zone->max_mem = val64;
136	if (zone->emer_mem < val64)
137	zone->emer_mem = val64;
138	} else if (attr == &ttm_mem_swap)
139	zone->swap_limit = val64;
140	spin_unlock(&zone->glob->lock);
141
142	ttm_check_swapping(zone->glob);
143
144	return size;
145	}
146
147	static struct attribute *ttm_mem_zone_attrs[] = {
148	&ttm_mem_sys,
149	&ttm_mem_emer,
150	&ttm_mem_max,
151	&ttm_mem_swap,
152	&ttm_mem_used,
153	NULL
154	};
155
52cf25d0	156	static const struct sysfs_ops ttm_mem_zone_ops = {
5fd9cbad TH	157	.show = &ttm_mem_zone_show,
	158	.store = &ttm_mem_zone_store
	159	};
	160
	161	static struct kobj_type ttm_mem_zone_kobj_type = {
	162	.release = &ttm_mem_zone_kobj_release,
	163	.sysfs_ops = &ttm_mem_zone_ops,
	164	.default_attrs = ttm_mem_zone_attrs,
	165	};
	166
	167	static void ttm_mem_global_kobj_release(struct kobject *kobj)
	168	{
	169	struct ttm_mem_global *glob =
	170	container_of(kobj, struct ttm_mem_global, kobj);
	171
	172	kfree(glob);
	173	}
	174
	175	static struct kobj_type ttm_mem_glob_kobj_type = {
	176	.release = &ttm_mem_global_kobj_release,
	177	};
	178
	179	static bool ttm_zones_above_swap_target(struct ttm_mem_global *glob,
	180	bool from_wq, uint64_t extra)
	181	{
	182	unsigned int i;
	183	struct ttm_mem_zone *zone;
	184	uint64_t target;
	185
	186	for (i = 0; i < glob->num_zones; ++i) {
	187	zone = glob->zones[i];
	188
	189	if (from_wq)
	190	target = zone->swap_limit;
	191	else if (capable(CAP_SYS_ADMIN))
	192	target = zone->emer_mem;
	193	else
	194	target = zone->max_mem;
	195
	196	target = (extra > target) ? 0ULL : target;
	197
	198	if (zone->used_mem > target)
	199	return true;
	200	}
	201	return false;
	202	}
	203
ba4e7d97 TH	204	/**
	205	* At this point we only support a single shrink callback.
	206	* Extend this if needed, perhaps using a linked list of callbacks.
	207	* Note that this function is reentrant:
	208	* many threads may try to swap out at any given time.
	209	*/
	210
5fd9cbad	211	static void ttm_shrink(struct ttm_mem_global *glob, bool from_wq,
ba4e7d97 TH	212	uint64_t extra)
	213	{
	214	int ret;
	215	struct ttm_mem_shrink *shrink;
ba4e7d97 TH	216
	217	spin_lock(&glob->lock);
	218	if (glob->shrink == NULL)
	219	goto out;
	220
5fd9cbad	221	while (ttm_zones_above_swap_target(glob, from_wq, extra)) {
ba4e7d97 TH	222	shrink = glob->shrink;
	223	spin_unlock(&glob->lock);
	224	ret = shrink->do_shrink(shrink);
	225	spin_lock(&glob->lock);
	226	if (unlikely(ret != 0))
	227	goto out;
	228	}
	229	out:
	230	spin_unlock(&glob->lock);
	231	}
	232
5fd9cbad TH	233
5fd9cbad TH	234
ba4e7d97 TH	235	static void ttm_shrink_work(struct work_struct *work)
	236	{
	237	struct ttm_mem_global *glob =
	238	container_of(work, struct ttm_mem_global, work);
	239
	240	ttm_shrink(glob, true, 0ULL);
	241	}
	242
5fd9cbad TH	243	static int ttm_mem_init_kernel_zone(struct ttm_mem_global *glob,
	244	const struct sysinfo *si)
	245	{
	246	struct ttm_mem_zone zone = kzalloc(sizeof(zone), GFP_KERNEL);
	247	uint64_t mem;
759e4f83	248	int ret;
5fd9cbad TH	249
	250	if (unlikely(!zone))
	251	return -ENOMEM;
	252
	253	mem = si->totalram - si->totalhigh;
	254	mem *= si->mem_unit;
	255
	256	zone->name = "kernel";
	257	zone->zone_mem = mem;
	258	zone->max_mem = mem >> 1;
	259	zone->emer_mem = (mem >> 1) + (mem >> 2);
	260	zone->swap_limit = zone->max_mem - (mem >> 3);
	261	zone->used_mem = 0;
	262	zone->glob = glob;
	263	glob->zone_kernel = zone;
5fd9cbad	264	kobject_init(&zone->kobj, &ttm_mem_zone_kobj_type);
759e4f83 TH	265	ret = kobject_add(&zone->kobj, &glob->kobj, zone->name);
	266	if (unlikely(ret != 0)) {
	267	kobject_put(&zone->kobj);
	268	return ret;
	269	}
	270	glob->zones[glob->num_zones++] = zone;
	271	return 0;
5fd9cbad TH	272	}
	273
	274	#ifdef CONFIG_HIGHMEM
	275	static int ttm_mem_init_highmem_zone(struct ttm_mem_global *glob,
	276	const struct sysinfo *si)
	277	{
46a79fa0	278	struct ttm_mem_zone *zone;
5fd9cbad	279	uint64_t mem;
759e4f83	280	int ret;
5fd9cbad	281
5fd9cbad TH	282	if (si->totalhigh == 0)
	283	return 0;
	284
46a79fa0 DC	285	zone = kzalloc(sizeof(*zone), GFP_KERNEL);
	286	if (unlikely(!zone))
	287	return -ENOMEM;
	288
5fd9cbad TH	289	mem = si->totalram;
	290	mem *= si->mem_unit;
	291
	292	zone->name = "highmem";
	293	zone->zone_mem = mem;
	294	zone->max_mem = mem >> 1;
	295	zone->emer_mem = (mem >> 1) + (mem >> 2);
	296	zone->swap_limit = zone->max_mem - (mem >> 3);
	297	zone->used_mem = 0;
	298	zone->glob = glob;
	299	glob->zone_highmem = zone;
5fd9cbad	300	kobject_init(&zone->kobj, &ttm_mem_zone_kobj_type);
759e4f83 TH	301	ret = kobject_add(&zone->kobj, &glob->kobj, zone->name);
	302	if (unlikely(ret != 0)) {
	303	kobject_put(&zone->kobj);
	304	return ret;
	305	}
	306	glob->zones[glob->num_zones++] = zone;
	307	return 0;
5fd9cbad TH	308	}
	309	#else
	310	static int ttm_mem_init_dma32_zone(struct ttm_mem_global *glob,
	311	const struct sysinfo *si)
	312	{
	313	struct ttm_mem_zone zone = kzalloc(sizeof(zone), GFP_KERNEL);
	314	uint64_t mem;
759e4f83	315	int ret;
5fd9cbad TH	316
	317	if (unlikely(!zone))
	318	return -ENOMEM;
	319
	320	mem = si->totalram;
	321	mem *= si->mem_unit;
	322
	323	/**
	324	* No special dma32 zone needed.
	325	*/
	326
ec42a6e7 DA	327	if (mem <= ((uint64_t) 1ULL << 32)) {
ec42a6e7 DA	328	kfree(zone);
5fd9cbad	329	return 0;
ec42a6e7	330	}
5fd9cbad TH	331
	332	/*
	333	* Limit max dma32 memory to 4GB for now
	334	* until we can figure out how big this
	335	* zone really is.
	336	*/
	337
	338	mem = ((uint64_t) 1ULL << 32);
	339	zone->name = "dma32";
	340	zone->zone_mem = mem;
	341	zone->max_mem = mem >> 1;
	342	zone->emer_mem = (mem >> 1) + (mem >> 2);
	343	zone->swap_limit = zone->max_mem - (mem >> 3);
	344	zone->used_mem = 0;
	345	zone->glob = glob;
	346	glob->zone_dma32 = zone;
5fd9cbad	347	kobject_init(&zone->kobj, &ttm_mem_zone_kobj_type);
759e4f83 TH	348	ret = kobject_add(&zone->kobj, &glob->kobj, zone->name);
	349	if (unlikely(ret != 0)) {
	350	kobject_put(&zone->kobj);
	351	return ret;
	352	}
	353	glob->zones[glob->num_zones++] = zone;
	354	return 0;
5fd9cbad TH	355	}
	356	#endif
	357
ba4e7d97 TH	358	int ttm_mem_global_init(struct ttm_mem_global *glob)
	359	{
	360	struct sysinfo si;
5fd9cbad TH	361	int ret;
	362	int i;
	363	struct ttm_mem_zone *zone;
ba4e7d97 TH	364
	365	spin_lock_init(&glob->lock);
	366	glob->swap_queue = create_singlethread_workqueue("ttm_swap");
	367	INIT_WORK(&glob->work, ttm_shrink_work);
	368	init_waitqueue_head(&glob->queue);
5fd9cbad TH	369	kobject_init(&glob->kobj, &ttm_mem_glob_kobj_type);
	370	ret = kobject_add(&glob->kobj,
	371	ttm_get_kobj(),
	372	"memory_accounting");
759e4f83 TH	373	if (unlikely(ret != 0)) {
	374	kobject_put(&glob->kobj);
	375	return ret;
	376	}
ba4e7d97 TH	377
	378	si_meminfo(&si);
	379
5fd9cbad TH	380	ret = ttm_mem_init_kernel_zone(glob, &si);
	381	if (unlikely(ret != 0))
	382	goto out_no_zone;
	383	#ifdef CONFIG_HIGHMEM
	384	ret = ttm_mem_init_highmem_zone(glob, &si);
	385	if (unlikely(ret != 0))
	386	goto out_no_zone;
	387	#else
	388	ret = ttm_mem_init_dma32_zone(glob, &si);
	389	if (unlikely(ret != 0))
	390	goto out_no_zone;
	391	#endif
	392	for (i = 0; i < glob->num_zones; ++i) {
	393	zone = glob->zones[i];
	394	printk(KERN_INFO TTM_PFX
	395	"Zone %7s: Available graphics memory: %llu kiB.\n",
	396	zone->name, (unsigned long long) zone->max_mem >> 10);
	397	}
ba4e7d97	398	return 0;
5fd9cbad TH	399	out_no_zone:
	400	ttm_mem_global_release(glob);
	401	return ret;
ba4e7d97 TH	402	}
	403	EXPORT_SYMBOL(ttm_mem_global_init);
	404
	405	void ttm_mem_global_release(struct ttm_mem_global *glob)
	406	{
5fd9cbad TH	407	unsigned int i;
	408	struct ttm_mem_zone *zone;
	409
ba4e7d97 TH	410	flush_workqueue(glob->swap_queue);
	411	destroy_workqueue(glob->swap_queue);
	412	glob->swap_queue = NULL;
5fd9cbad TH	413	for (i = 0; i < glob->num_zones; ++i) {
	414	zone = glob->zones[i];
	415	kobject_del(&zone->kobj);
	416	kobject_put(&zone->kobj);
	417	}
	418	kobject_del(&glob->kobj);
	419	kobject_put(&glob->kobj);
ba4e7d97 TH	420	}
	421	EXPORT_SYMBOL(ttm_mem_global_release);
	422
5fd9cbad	423	static void ttm_check_swapping(struct ttm_mem_global *glob)
ba4e7d97	424	{
5fd9cbad TH	425	bool needs_swapping = false;
	426	unsigned int i;
	427	struct ttm_mem_zone *zone;
ba4e7d97 TH	428
ba4e7d97 TH	429	spin_lock(&glob->lock);
5fd9cbad TH	430	for (i = 0; i < glob->num_zones; ++i) {
	431	zone = glob->zones[i];
	432	if (zone->used_mem > zone->swap_limit) {
	433	needs_swapping = true;
	434	break;
	435	}
	436	}
	437
ba4e7d97 TH	438	spin_unlock(&glob->lock);
	439
	440	if (unlikely(needs_swapping))
	441	(void)queue_work(glob->swap_queue, &glob->work);
	442
	443	}
	444
5fd9cbad TH	445	static void ttm_mem_global_free_zone(struct ttm_mem_global *glob,
	446	struct ttm_mem_zone *single_zone,
	447	uint64_t amount)
ba4e7d97	448	{
5fd9cbad TH	449	unsigned int i;
	450	struct ttm_mem_zone *zone;
	451
ba4e7d97	452	spin_lock(&glob->lock);
5fd9cbad TH	453	for (i = 0; i < glob->num_zones; ++i) {
	454	zone = glob->zones[i];
	455	if (single_zone && zone != single_zone)
	456	continue;
	457	zone->used_mem -= amount;
	458	}
ba4e7d97 TH	459	spin_unlock(&glob->lock);
	460	}
	461
5fd9cbad TH	462	void ttm_mem_global_free(struct ttm_mem_global *glob,
	463	uint64_t amount)
	464	{
	465	return ttm_mem_global_free_zone(glob, NULL, amount);
	466	}
4bfd75cb	467	EXPORT_SYMBOL(ttm_mem_global_free);
5fd9cbad	468
ba4e7d97	469	static int ttm_mem_global_reserve(struct ttm_mem_global *glob,
5fd9cbad TH	470	struct ttm_mem_zone *single_zone,
5fd9cbad TH	471	uint64_t amount, bool reserve)
ba4e7d97 TH	472	{
ba4e7d97 TH	473	uint64_t limit;
ba4e7d97	474	int ret = -ENOMEM;
5fd9cbad TH	475	unsigned int i;
5fd9cbad TH	476	struct ttm_mem_zone *zone;
ba4e7d97 TH	477
ba4e7d97 TH	478	spin_lock(&glob->lock);
5fd9cbad TH	479	for (i = 0; i < glob->num_zones; ++i) {
	480	zone = glob->zones[i];
	481	if (single_zone && zone != single_zone)
	482	continue;
ba4e7d97	483
5fd9cbad TH	484	limit = (capable(CAP_SYS_ADMIN)) ?
5fd9cbad TH	485	zone->emer_mem : zone->max_mem;
ba4e7d97	486
5fd9cbad TH	487	if (zone->used_mem > limit)
	488	goto out_unlock;
	489	}
ba4e7d97 TH	490
ba4e7d97 TH	491	if (reserve) {
5fd9cbad TH	492	for (i = 0; i < glob->num_zones; ++i) {
	493	zone = glob->zones[i];
	494	if (single_zone && zone != single_zone)
	495	continue;
	496	zone->used_mem += amount;
	497	}
ba4e7d97	498	}
5fd9cbad	499
ba4e7d97 TH	500	ret = 0;
	501	out_unlock:
	502	spin_unlock(&glob->lock);
	503	ttm_check_swapping(glob);
	504
	505	return ret;
	506	}
	507
5fd9cbad TH	508
	509	static int ttm_mem_global_alloc_zone(struct ttm_mem_global *glob,
	510	struct ttm_mem_zone *single_zone,
	511	uint64_t memory,
	512	bool no_wait, bool interruptible)
ba4e7d97 TH	513	{
	514	int count = TTM_MEMORY_ALLOC_RETRIES;
	515
5fd9cbad TH	516	while (unlikely(ttm_mem_global_reserve(glob,
	517	single_zone,
	518	memory, true)
ba4e7d97 TH	519	!= 0)) {
	520	if (no_wait)
	521	return -ENOMEM;
	522	if (unlikely(count-- == 0))
	523	return -ENOMEM;
	524	ttm_shrink(glob, false, memory + (memory >> 2) + 16);
	525	}
	526
	527	return 0;
	528	}
	529
5fd9cbad TH	530	int ttm_mem_global_alloc(struct ttm_mem_global *glob, uint64_t memory,
	531	bool no_wait, bool interruptible)
	532	{
	533	/**
	534	* Normal allocations of kernel memory are registered in
	535	* all zones.
	536	*/
	537
	538	return ttm_mem_global_alloc_zone(glob, NULL, memory, no_wait,
	539	interruptible);
	540	}
4bfd75cb	541	EXPORT_SYMBOL(ttm_mem_global_alloc);
5fd9cbad TH	542
	543	int ttm_mem_global_alloc_page(struct ttm_mem_global *glob,
	544	struct page *page,
	545	bool no_wait, bool interruptible)
	546	{
	547
	548	struct ttm_mem_zone *zone = NULL;
	549
	550	/**
	551	* Page allocations may be registed in a single zone
	552	* only if highmem or !dma32.
	553	*/
	554
	555	#ifdef CONFIG_HIGHMEM
	556	if (PageHighMem(page) && glob->zone_highmem != NULL)
	557	zone = glob->zone_highmem;
	558	#else
	559	if (glob->zone_dma32 && page_to_pfn(page) > 0x00100000UL)
	560	zone = glob->zone_kernel;
	561	#endif
	562	return ttm_mem_global_alloc_zone(glob, zone, PAGE_SIZE, no_wait,
	563	interruptible);
	564	}
	565
	566	void ttm_mem_global_free_page(struct ttm_mem_global glob, struct page page)
	567	{
	568	struct ttm_mem_zone *zone = NULL;
	569
	570	#ifdef CONFIG_HIGHMEM
	571	if (PageHighMem(page) && glob->zone_highmem != NULL)
	572	zone = glob->zone_highmem;
	573	#else
	574	if (glob->zone_dma32 && page_to_pfn(page) > 0x00100000UL)
	575	zone = glob->zone_kernel;
	576	#endif
	577	ttm_mem_global_free_zone(glob, zone, PAGE_SIZE);
	578	}
	579
	580
ba4e7d97 TH	581	size_t ttm_round_pot(size_t size)
	582	{
	583	if ((size & (size - 1)) == 0)
	584	return size;
	585	else if (size > PAGE_SIZE)
	586	return PAGE_ALIGN(size);
	587	else {
	588	size_t tmp_size = 4;
	589
	590	while (tmp_size < size)
	591	tmp_size <<= 1;
	592
	593	return tmp_size;
	594	}
	595	return 0;
	596	}
4bfd75cb	597	EXPORT_SYMBOL(ttm_round_pot);