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Regard whitespace Rev 5077 → Rev 5078

/drivers/video/drm/ttm/ttm_page_alloc.c
41,7 → 41,7
#include <linux/mm.h>
#include <linux/seq_file.h> /* for seq_printf */
#include <linux/slab.h>
#include <linux/dma-mapping.h>
//#include <linux/dma-mapping.h>
 
//#include <linux/atomic.h>
 
58,12 → 58,6
/* times are in msecs */
#define PAGE_FREE_INTERVAL 1000
 
#define pr_err(fmt, ...) \
printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
 
 
 
#if 0
/**
* struct ttm_page_pool - Pool to reuse recently allocated uc/wc pages.
*
115,7 → 109,6
**/
struct ttm_pool_manager {
struct kobject kobj;
struct shrinker mm_shrink;
struct ttm_pool_opts options;
 
union {
129,134 → 122,10
};
};
 
static struct attribute ttm_page_pool_max = {
.name = "pool_max_size",
.mode = S_IRUGO | S_IWUSR
};
static struct attribute ttm_page_pool_small = {
.name = "pool_small_allocation",
.mode = S_IRUGO | S_IWUSR
};
static struct attribute ttm_page_pool_alloc_size = {
.name = "pool_allocation_size",
.mode = S_IRUGO | S_IWUSR
};
 
static struct attribute *ttm_pool_attrs[] = {
&ttm_page_pool_max,
&ttm_page_pool_small,
&ttm_page_pool_alloc_size,
NULL
};
 
static void ttm_pool_kobj_release(struct kobject *kobj)
{
struct ttm_pool_manager *m =
container_of(kobj, struct ttm_pool_manager, kobj);
kfree(m);
}
 
static ssize_t ttm_pool_store(struct kobject *kobj,
struct attribute *attr, const char *buffer, size_t size)
{
struct ttm_pool_manager *m =
container_of(kobj, struct ttm_pool_manager, kobj);
int chars;
unsigned val;
chars = sscanf(buffer, "%u", &val);
if (chars == 0)
return size;
 
/* Convert kb to number of pages */
val = val / (PAGE_SIZE >> 10);
 
if (attr == &ttm_page_pool_max)
m->options.max_size = val;
else if (attr == &ttm_page_pool_small)
m->options.small = val;
else if (attr == &ttm_page_pool_alloc_size) {
if (val > NUM_PAGES_TO_ALLOC*8) {
pr_err("Setting allocation size to %lu is not allowed. Recommended size is %lu\n",
NUM_PAGES_TO_ALLOC*(PAGE_SIZE >> 7),
NUM_PAGES_TO_ALLOC*(PAGE_SIZE >> 10));
return size;
} else if (val > NUM_PAGES_TO_ALLOC) {
pr_warn("Setting allocation size to larger than %lu is not recommended\n",
NUM_PAGES_TO_ALLOC*(PAGE_SIZE >> 10));
}
m->options.alloc_size = val;
}
 
return size;
}
 
static ssize_t ttm_pool_show(struct kobject *kobj,
struct attribute *attr, char *buffer)
{
struct ttm_pool_manager *m =
container_of(kobj, struct ttm_pool_manager, kobj);
unsigned val = 0;
 
if (attr == &ttm_page_pool_max)
val = m->options.max_size;
else if (attr == &ttm_page_pool_small)
val = m->options.small;
else if (attr == &ttm_page_pool_alloc_size)
val = m->options.alloc_size;
 
val = val * (PAGE_SIZE >> 10);
 
return snprintf(buffer, PAGE_SIZE, "%u\n", val);
}
 
static const struct sysfs_ops ttm_pool_sysfs_ops = {
.show = &ttm_pool_show,
.store = &ttm_pool_store,
};
 
static struct kobj_type ttm_pool_kobj_type = {
.release = &ttm_pool_kobj_release,
.sysfs_ops = &ttm_pool_sysfs_ops,
.default_attrs = ttm_pool_attrs,
};
 
static struct ttm_pool_manager *_manager;
 
#ifndef CONFIG_X86
static int set_pages_array_wb(struct page **pages, int addrinarray)
{
#ifdef TTM_HAS_AGP
int i;
 
for (i = 0; i < addrinarray; i++)
unmap_page_from_agp(pages[i]);
#endif
return 0;
}
 
static int set_pages_array_wc(struct page **pages, int addrinarray)
{
#ifdef TTM_HAS_AGP
int i;
 
for (i = 0; i < addrinarray; i++)
map_page_into_agp(pages[i]);
#endif
return 0;
}
 
static int set_pages_array_uc(struct page **pages, int addrinarray)
{
#ifdef TTM_HAS_AGP
int i;
 
for (i = 0; i < addrinarray; i++)
map_page_into_agp(pages[i]);
#endif
return 0;
}
#endif
 
/**
* Select the right pool or requested caching state and ttm flags. */
static struct ttm_page_pool *ttm_get_pool(int flags,
282,8 → 151,6
static void ttm_pages_put(struct page *pages[], unsigned npages)
{
unsigned i;
if (set_pages_array_wb(pages, npages))
pr_err("Failed to set %d pages to wb!\n", npages);
for (i = 0; i < npages; ++i)
__free_page(pages[i]);
}
295,407 → 162,21
pool->nfrees += freed_pages;
}
 
/**
* Free pages from pool.
*
* To prevent hogging the ttm_swap process we only free NUM_PAGES_TO_ALLOC
* number of pages in one go.
*
* @pool: to free the pages from
* @free_all: If set to true will free all pages in pool
**/
static int ttm_page_pool_free(struct ttm_page_pool *pool, unsigned nr_free)
{
unsigned long irq_flags;
struct page *p;
struct page **pages_to_free;
unsigned freed_pages = 0,
npages_to_free = nr_free;
 
if (NUM_PAGES_TO_ALLOC < nr_free)
npages_to_free = NUM_PAGES_TO_ALLOC;
 
pages_to_free = kmalloc(npages_to_free * sizeof(struct page *),
GFP_KERNEL);
if (!pages_to_free) {
pr_err("Failed to allocate memory for pool free operation\n");
return 0;
}
 
restart:
spin_lock_irqsave(&pool->lock, irq_flags);
 
list_for_each_entry_reverse(p, &pool->list, lru) {
if (freed_pages >= npages_to_free)
break;
 
pages_to_free[freed_pages++] = p;
/* We can only remove NUM_PAGES_TO_ALLOC at a time. */
if (freed_pages >= NUM_PAGES_TO_ALLOC) {
/* remove range of pages from the pool */
__list_del(p->lru.prev, &pool->list);
 
ttm_pool_update_free_locked(pool, freed_pages);
/**
* Because changing page caching is costly
* we unlock the pool to prevent stalling.
*/
spin_unlock_irqrestore(&pool->lock, irq_flags);
 
ttm_pages_put(pages_to_free, freed_pages);
if (likely(nr_free != FREE_ALL_PAGES))
nr_free -= freed_pages;
 
if (NUM_PAGES_TO_ALLOC >= nr_free)
npages_to_free = nr_free;
else
npages_to_free = NUM_PAGES_TO_ALLOC;
 
freed_pages = 0;
 
/* free all so restart the processing */
if (nr_free)
goto restart;
 
/* Not allowed to fall through or break because
* following context is inside spinlock while we are
* outside here.
*/
goto out;
 
}
}
 
/* remove range of pages from the pool */
if (freed_pages) {
__list_del(&p->lru, &pool->list);
 
ttm_pool_update_free_locked(pool, freed_pages);
nr_free -= freed_pages;
}
 
spin_unlock_irqrestore(&pool->lock, irq_flags);
 
if (freed_pages)
ttm_pages_put(pages_to_free, freed_pages);
out:
kfree(pages_to_free);
return nr_free;
}
 
/**
* Callback for mm to request pool to reduce number of page held.
*
* XXX: (dchinner) Deadlock warning!
*
* ttm_page_pool_free() does memory allocation using GFP_KERNEL. that means
* this can deadlock when called a sc->gfp_mask that is not equal to
* GFP_KERNEL.
*
* This code is crying out for a shrinker per pool....
*/
static unsigned long
ttm_pool_shrink_scan(struct shrinker *shrink, struct shrink_control *sc)
{
static atomic_t start_pool = ATOMIC_INIT(0);
unsigned i;
unsigned pool_offset = atomic_add_return(1, &start_pool);
struct ttm_page_pool *pool;
int shrink_pages = sc->nr_to_scan;
unsigned long freed = 0;
 
pool_offset = pool_offset % NUM_POOLS;
/* select start pool in round robin fashion */
for (i = 0; i < NUM_POOLS; ++i) {
unsigned nr_free = shrink_pages;
if (shrink_pages == 0)
break;
pool = &_manager->pools[(i + pool_offset)%NUM_POOLS];
shrink_pages = ttm_page_pool_free(pool, nr_free);
freed += nr_free - shrink_pages;
}
return freed;
}
 
 
static unsigned long
ttm_pool_shrink_count(struct shrinker *shrink, struct shrink_control *sc)
{
unsigned i;
unsigned long count = 0;
 
for (i = 0; i < NUM_POOLS; ++i)
count += _manager->pools[i].npages;
 
return count;
}
 
static void ttm_pool_mm_shrink_init(struct ttm_pool_manager *manager)
{
manager->mm_shrink.count_objects = ttm_pool_shrink_count;
manager->mm_shrink.scan_objects = ttm_pool_shrink_scan;
manager->mm_shrink.seeks = 1;
register_shrinker(&manager->mm_shrink);
}
 
static void ttm_pool_mm_shrink_fini(struct ttm_pool_manager *manager)
{
unregister_shrinker(&manager->mm_shrink);
}
 
static int ttm_set_pages_caching(struct page **pages,
enum ttm_caching_state cstate, unsigned cpages)
{
int r = 0;
/* Set page caching */
switch (cstate) {
case tt_uncached:
r = set_pages_array_uc(pages, cpages);
if (r)
pr_err("Failed to set %d pages to uc!\n", cpages);
break;
case tt_wc:
r = set_pages_array_wc(pages, cpages);
if (r)
pr_err("Failed to set %d pages to wc!\n", cpages);
break;
default:
break;
}
return r;
}
 
/**
* Free pages the pages that failed to change the caching state. If there is
* any pages that have changed their caching state already put them to the
* pool.
*/
static void ttm_handle_caching_state_failure(struct list_head *pages,
int ttm_flags, enum ttm_caching_state cstate,
struct page **failed_pages, unsigned cpages)
{
unsigned i;
/* Failed pages have to be freed */
for (i = 0; i < cpages; ++i) {
list_del(&failed_pages[i]->lru);
__free_page(failed_pages[i]);
}
}
 
/**
* Allocate new pages with correct caching.
*
* This function is reentrant if caller updates count depending on number of
* pages returned in pages array.
*/
static int ttm_alloc_new_pages(struct list_head *pages, gfp_t gfp_flags,
int ttm_flags, enum ttm_caching_state cstate, unsigned count)
{
struct page **caching_array;
struct page *p;
int r = 0;
unsigned i, cpages;
unsigned max_cpages = min(count,
(unsigned)(PAGE_SIZE/sizeof(struct page *)));
 
/* allocate array for page caching change */
caching_array = kmalloc(max_cpages*sizeof(struct page *), GFP_KERNEL);
 
if (!caching_array) {
pr_err("Unable to allocate table for new pages\n");
return -ENOMEM;
}
 
for (i = 0, cpages = 0; i < count; ++i) {
p = alloc_page(gfp_flags);
 
if (!p) {
pr_err("Unable to get page %u\n", i);
 
/* store already allocated pages in the pool after
* setting the caching state */
if (cpages) {
r = ttm_set_pages_caching(caching_array,
cstate, cpages);
if (r)
ttm_handle_caching_state_failure(pages,
ttm_flags, cstate,
caching_array, cpages);
}
r = -ENOMEM;
goto out;
}
 
#ifdef CONFIG_HIGHMEM
/* gfp flags of highmem page should never be dma32 so we
* we should be fine in such case
*/
if (!PageHighMem(p))
#endif
{
caching_array[cpages++] = p;
if (cpages == max_cpages) {
 
r = ttm_set_pages_caching(caching_array,
cstate, cpages);
if (r) {
ttm_handle_caching_state_failure(pages,
ttm_flags, cstate,
caching_array, cpages);
goto out;
}
cpages = 0;
}
}
 
list_add(&p->lru, pages);
}
 
if (cpages) {
r = ttm_set_pages_caching(caching_array, cstate, cpages);
if (r)
ttm_handle_caching_state_failure(pages,
ttm_flags, cstate,
caching_array, cpages);
}
out:
kfree(caching_array);
 
return r;
}
 
/**
* Fill the given pool if there aren't enough pages and the requested number of
* pages is small.
*/
static void ttm_page_pool_fill_locked(struct ttm_page_pool *pool,
int ttm_flags, enum ttm_caching_state cstate, unsigned count,
unsigned long *irq_flags)
{
struct page *p;
int r;
unsigned cpages = 0;
/**
* Only allow one pool fill operation at a time.
* If pool doesn't have enough pages for the allocation new pages are
* allocated from outside of pool.
*/
if (pool->fill_lock)
return;
 
pool->fill_lock = true;
 
/* If allocation request is small and there are not enough
* pages in a pool we fill the pool up first. */
if (count < _manager->options.small
&& count > pool->npages) {
struct list_head new_pages;
unsigned alloc_size = _manager->options.alloc_size;
 
/**
* Can't change page caching if in irqsave context. We have to
* drop the pool->lock.
*/
spin_unlock_irqrestore(&pool->lock, *irq_flags);
 
INIT_LIST_HEAD(&new_pages);
r = ttm_alloc_new_pages(&new_pages, pool->gfp_flags, ttm_flags,
cstate, alloc_size);
spin_lock_irqsave(&pool->lock, *irq_flags);
 
if (!r) {
list_splice(&new_pages, &pool->list);
++pool->nrefills;
pool->npages += alloc_size;
} else {
pr_err("Failed to fill pool (%p)\n", pool);
/* If we have any pages left put them to the pool. */
list_for_each_entry(p, &pool->list, lru) {
++cpages;
}
list_splice(&new_pages, &pool->list);
pool->npages += cpages;
}
 
}
pool->fill_lock = false;
}
 
/**
* Cut 'count' number of pages from the pool and put them on the return list.
*
* @return count of pages still required to fulfill the request.
*/
static unsigned ttm_page_pool_get_pages(struct ttm_page_pool *pool,
struct list_head *pages,
int ttm_flags,
enum ttm_caching_state cstate,
unsigned count)
{
unsigned long irq_flags;
struct list_head *p;
unsigned i;
 
spin_lock_irqsave(&pool->lock, irq_flags);
ttm_page_pool_fill_locked(pool, ttm_flags, cstate, count, &irq_flags);
 
if (count >= pool->npages) {
/* take all pages from the pool */
list_splice_init(&pool->list, pages);
count -= pool->npages;
pool->npages = 0;
goto out;
}
/* find the last pages to include for requested number of pages. Split
* pool to begin and halve it to reduce search space. */
if (count <= pool->npages/2) {
i = 0;
list_for_each(p, &pool->list) {
if (++i == count)
break;
}
} else {
i = pool->npages + 1;
list_for_each_prev(p, &pool->list) {
if (--i == count)
break;
}
}
/* Cut 'count' number of pages from the pool */
list_cut_position(pages, &pool->list, p);
pool->npages -= count;
count = 0;
out:
spin_unlock_irqrestore(&pool->lock, irq_flags);
return count;
}
#endif
 
/* Put all pages in pages list to correct pool to wait for reuse */
static void ttm_put_pages(struct page **pages, unsigned npages, int flags,
enum ttm_caching_state cstate)
{
unsigned long irq_flags;
// struct ttm_page_pool *pool = ttm_get_pool(flags, cstate);
struct ttm_page_pool *pool = ttm_get_pool(flags, cstate);
unsigned i;
 
for (i = 0; i < npages; i++) {
if (pages[i]) {
// if (page_count(pages[i]) != 1)
// pr_err("Erroneous page count. Leaking pages.\n");
FreePage(pages[i]);
pages[i] = NULL;
}
}
return;
 
#if 0
if (pool == NULL) {
if (1) {
/* No pool for this memory type so free the pages */
for (i = 0; i < npages; i++) {
if (pages[i]) {
if (page_count(pages[i]) != 1)
pr_err("Erroneous page count. Leaking pages.\n");
__free_page(pages[i]);
pages[i] = NULL;
}
703,32 → 184,8
return;
}
 
spin_lock_irqsave(&pool->lock, irq_flags);
for (i = 0; i < npages; i++) {
if (pages[i]) {
if (page_count(pages[i]) != 1)
pr_err("Erroneous page count. Leaking pages.\n");
list_add_tail(&pages[i]->lru, &pool->list);
pages[i] = NULL;
pool->npages++;
}
}
/* Check that we don't go over the pool limit */
npages = 0;
if (pool->npages > _manager->options.max_size) {
npages = pool->npages - _manager->options.max_size;
/* free at least NUM_PAGES_TO_ALLOC number of pages
* to reduce calls to set_memory_wb */
if (npages < NUM_PAGES_TO_ALLOC)
npages = NUM_PAGES_TO_ALLOC;
}
spin_unlock_irqrestore(&pool->lock, irq_flags);
if (npages)
ttm_page_pool_free(pool, npages);
#endif
 
}
 
/*
* On success pages list will hold count number of correctly
* cached pages.
736,44 → 193,21
static int ttm_get_pages(struct page **pages, unsigned npages, int flags,
enum ttm_caching_state cstate)
{
// struct ttm_page_pool *pool = ttm_get_pool(flags, cstate);
struct ttm_page_pool *pool = ttm_get_pool(flags, cstate);
struct list_head plist;
struct page *p = NULL;
// gfp_t gfp_flags = GFP_USER;
gfp_t gfp_flags = 0;
unsigned count;
int r;
 
for (r = 0; r < npages; ++r) {
p = AllocPage();
if (!p) {
 
pr_err("Unable to allocate page\n");
return -ENOMEM;
}
 
pages[r] = p;
}
return 0;
 
#if 0
 
 
/* set zero flag for page allocation if required */
if (flags & TTM_PAGE_FLAG_ZERO_ALLOC)
gfp_flags |= __GFP_ZERO;
 
/* No pool for cached pages */
if (pool == NULL) {
if (flags & TTM_PAGE_FLAG_DMA32)
gfp_flags |= GFP_DMA32;
else
gfp_flags |= GFP_HIGHUSER;
if (1) {
 
for (r = 0; r < npages; ++r) {
p = alloc_page(gfp_flags);
if (!p) {
 
pr_err("Unable to allocate page\n");
return -ENOMEM;
}
 
782,52 → 216,12
return 0;
}
 
/* combine zero flag to pool flags */
gfp_flags |= pool->gfp_flags;
 
/* First we take pages from the pool */
INIT_LIST_HEAD(&plist);
npages = ttm_page_pool_get_pages(pool, &plist, flags, cstate, npages);
count = 0;
list_for_each_entry(p, &plist, lru) {
pages[count++] = p;
}
 
/* clear the pages coming from the pool if requested */
if (flags & TTM_PAGE_FLAG_ZERO_ALLOC) {
list_for_each_entry(p, &plist, lru) {
if (PageHighMem(p))
clear_highpage(p);
else
clear_page(page_address(p));
}
}
 
/* If pool didn't have enough pages allocate new one. */
if (npages > 0) {
/* ttm_alloc_new_pages doesn't reference pool so we can run
* multiple requests in parallel.
**/
INIT_LIST_HEAD(&plist);
r = ttm_alloc_new_pages(&plist, gfp_flags, flags, cstate, npages);
list_for_each_entry(p, &plist, lru) {
pages[count++] = p;
}
if (r) {
/* If there is any pages in the list put them back to
* the pool. */
pr_err("Failed to allocate extra pages for large request\n");
ttm_put_pages(pages, count, flags, cstate);
return r;
}
}
#endif
 
return 0;
}
 
#if 0
static void ttm_page_pool_init_locked(struct ttm_page_pool *pool, int flags,
static void ttm_page_pool_init_locked(struct ttm_page_pool *pool, gfp_t flags,
char *name)
{
spin_lock_init(&pool->lock);
844,34 → 238,12
 
WARN_ON(_manager);
 
pr_info("Initializing pool allocator\n");
 
_manager = kzalloc(sizeof(*_manager), GFP_KERNEL);
 
ttm_page_pool_init_locked(&_manager->wc_pool, GFP_HIGHUSER, "wc");
 
ttm_page_pool_init_locked(&_manager->uc_pool, GFP_HIGHUSER, "uc");
 
ttm_page_pool_init_locked(&_manager->wc_pool_dma32,
GFP_USER | GFP_DMA32, "wc dma");
 
ttm_page_pool_init_locked(&_manager->uc_pool_dma32,
GFP_USER | GFP_DMA32, "uc dma");
 
_manager->options.max_size = max_pages;
_manager->options.small = SMALL_ALLOCATION;
_manager->options.alloc_size = NUM_PAGES_TO_ALLOC;
 
ret = kobject_init_and_add(&_manager->kobj, &ttm_pool_kobj_type,
&glob->kobj, "pool");
if (unlikely(ret != 0)) {
kobject_put(&_manager->kobj);
_manager = NULL;
return ret;
}
 
ttm_pool_mm_shrink_init(_manager);
 
return 0;
}
 
879,18 → 251,9
{
int i;
 
pr_info("Finalizing pool allocator\n");
ttm_pool_mm_shrink_fini(_manager);
 
for (i = 0; i < NUM_POOLS; ++i)
ttm_page_pool_free(&_manager->pools[i], FREE_ALL_PAGES);
 
kobject_put(&_manager->kobj);
_manager = NULL;
}
 
#endif
 
int ttm_pool_populate(struct ttm_tt *ttm)
{
struct ttm_mem_global *mem_glob = ttm->glob->mem_glob;
908,9 → 271,7
ttm_pool_unpopulate(ttm);
return -ENOMEM;
}
 
}
 
ttm->state = tt_unbound;
return 0;
}
922,8 → 283,6
 
for (i = 0; i < ttm->num_pages; ++i) {
if (ttm->pages[i]) {
ttm_mem_global_free_page(ttm->glob->mem_glob,
ttm->pages[i]);
ttm_put_pages(&ttm->pages[i], 1,
ttm->page_flags,
ttm->caching_state);