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); |