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struct sysinfo {

    u32_t totalram;      /* Total usable main memory size */

    u32_t freeram;       /* Available memory size */

    u32_t sharedram;     /* Amount of shared memory */

    u32_t bufferram;     /* Memory used by buffers */

    u32_t totalswap;     /* Total swap space size */

    u32_t freeswap;      /* swap space still available */

    u32_t totalhigh;     /* Total high memory size */

    u32_t freehigh;      /* Available high memory size */

    u32_t mem_unit;                 /* Memory unit size in bytes */

};

#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;

};

#if 0

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

};

#endif

static void ttm_mem_zone_kobj_release(struct kobject *kobj)

{

	struct ttm_mem_zone *zone =

		container_of(kobj, struct ttm_mem_zone, kobj);

	pr_info("Zone %7s: Used memory at exit: %llu kiB\n",

		zone->name, (unsigned long long)zone->used_mem >> 10);

	kfree(zone);

}

#if 0

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;

}

#endif

//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,

};

#if 0

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);

#endif

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;

	ret = kobject_init_and_add(

		&zone->kobj, &ttm_mem_zone_kobj_type, &glob->kobj, zone->name);

	if (unlikely(ret != 0)) {

		kobject_put(&zone->kobj);

		return ret;

	}

	glob->zones[glob->num_zones++] = zone;

	return 0;

}

#if 0

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;

	ret = kobject_init_and_add(

		&zone->kobj, &ttm_mem_zone_kobj_type, &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;

		return -ENOMEM;

	mem = si->totalram;

	/**

	 * 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);

	glob->zone_dma32 = zone;

	ret = kobject_init_and_add(

		&zone->kobj, &ttm_mem_zone_kobj_type, &glob->kobj, zone->name);

	if (unlikely(ret != 0)) {

		kobject_put(&zone->kobj);

	return 0;

void ttm_mem_global_release(struct ttm_mem_global *glob)

{

	unsigned int i;

	struct ttm_mem_zone *zone;

	/* let the page allocator first stop the shrink work. */

	ttm_page_alloc_fini();

	ttm_dma_page_alloc_fini();

	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 = zone->emer_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)

void ttm_mem_global_free(struct ttm_mem_global *glob,

             uint64_t amount)

{

    return 0;

}

int ttm_mem_global_alloc(struct ttm_mem_global *glob, uint64_t memory,

             bool no_wait, bool interruptible)

{

    return 0;

}

EXPORT_SYMBOL(ttm_mem_global_alloc);

int ttm_mem_global_init(struct ttm_mem_global *glob)

{

    return 0;

}

EXPORT_SYMBOL(ttm_mem_global_init);