[PATCH 07/14] drm/ttm: page allocation use page array instead of list
j.glisse at gmail.com
j.glisse at gmail.com
Fri Nov 11 14:47:42 PST 2011
From: Jerome Glisse <jglisse at redhat.com>
Use the ttm_tt pages array for pages allocations, move the list
unwinding into the page allocation functions.
Signed-off-by: Jerome Glisse <jglisse at redhat.com>
---
drivers/gpu/drm/ttm/ttm_page_alloc.c | 85 +++++++++++++++++++++-------------
drivers/gpu/drm/ttm/ttm_tt.c | 36 +++------------
include/drm/ttm/ttm_page_alloc.h | 8 ++--
3 files changed, 63 insertions(+), 66 deletions(-)
diff --git a/drivers/gpu/drm/ttm/ttm_page_alloc.c b/drivers/gpu/drm/ttm/ttm_page_alloc.c
index 727e93d..0f3e6d2 100644
--- a/drivers/gpu/drm/ttm/ttm_page_alloc.c
+++ b/drivers/gpu/drm/ttm/ttm_page_alloc.c
@@ -619,8 +619,10 @@ static void ttm_page_pool_fill_locked(struct ttm_page_pool *pool,
* @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)
+ struct list_head *pages,
+ int ttm_flags,
+ enum ttm_caching_state cstate,
+ unsigned count)
{
unsigned long irq_flags;
struct list_head *p;
@@ -664,13 +666,15 @@ out:
* On success pages list will hold count number of correctly
* cached pages.
*/
-int ttm_get_pages(struct list_head *pages, int flags,
- enum ttm_caching_state cstate, unsigned count,
+int ttm_get_pages(struct page **pages, int flags,
+ enum ttm_caching_state cstate, unsigned npages,
dma_addr_t *dma_address)
{
struct ttm_page_pool *pool = ttm_get_pool(flags, cstate);
+ struct list_head plist;
struct page *p = NULL;
gfp_t gfp_flags = GFP_USER;
+ unsigned count;
int r;
/* set zero flag for page allocation if required */
@@ -684,7 +688,7 @@ int ttm_get_pages(struct list_head *pages, int flags,
else
gfp_flags |= GFP_HIGHUSER;
- for (r = 0; r < count; ++r) {
+ for (r = 0; r < npages; ++r) {
p = alloc_page(gfp_flags);
if (!p) {
@@ -693,85 +697,100 @@ int ttm_get_pages(struct list_head *pages, int flags,
return -ENOMEM;
}
- list_add(&p->lru, pages);
+ pages[r] = p;
}
return 0;
}
-
/* combine zero flag to pool flags */
gfp_flags |= pool->gfp_flags;
/* First we take pages from the pool */
- count = ttm_page_pool_get_pages(pool, pages, flags, cstate, count);
+ 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, pages, lru) {
+ list_for_each_entry(p, &plist, lru) {
clear_page(page_address(p));
}
}
/* If pool didn't have enough pages allocate new one. */
- if (count > 0) {
+ if (npages > 0) {
/* ttm_alloc_new_pages doesn't reference pool so we can run
* multiple requests in parallel.
**/
- r = ttm_alloc_new_pages(pages, gfp_flags, flags, cstate, count);
+ 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. */
printk(KERN_ERR TTM_PFX
"Failed to allocate extra pages "
"for large request.");
- ttm_put_pages(pages, 0, flags, cstate, NULL);
+ ttm_put_pages(pages, count, flags, cstate, NULL);
return r;
}
}
-
return 0;
}
/* Put all pages in pages list to correct pool to wait for reuse */
-void ttm_put_pages(struct list_head *pages, unsigned page_count, int flags,
+void ttm_put_pages(struct page **pages, unsigned npages, int flags,
enum ttm_caching_state cstate, dma_addr_t *dma_address)
{
unsigned long irq_flags;
struct ttm_page_pool *pool = ttm_get_pool(flags, cstate);
- struct page *p, *tmp;
+ unsigned i;
if (pool == NULL) {
/* No pool for this memory type so free the pages */
-
- list_for_each_entry_safe(p, tmp, pages, lru) {
- __free_page(p);
+ for (i = 0; i < npages; i++) {
+ if (pages[i]) {
+ if (page_count(pages[i]) != 1)
+ printk(KERN_ERR TTM_PFX
+ "Erroneous page count. "
+ "Leaking pages.\n");
+ __free_page(pages[i]);
+ pages[i] = NULL;
+ }
}
- /* Make the pages list empty */
- INIT_LIST_HEAD(pages);
return;
}
- if (page_count == 0) {
- list_for_each_entry_safe(p, tmp, pages, lru) {
- ++page_count;
- }
- }
spin_lock_irqsave(&pool->lock, irq_flags);
- list_splice_init(pages, &pool->list);
- pool->npages += page_count;
+ for (i = 0; i < npages; i++) {
+ if (pages[i]) {
+ if (page_count(pages[i]) != 1)
+ printk(KERN_ERR TTM_PFX
+ "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 */
- page_count = 0;
+ npages = 0;
if (pool->npages > _manager->options.max_size) {
- page_count = 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 (page_count < NUM_PAGES_TO_ALLOC)
- page_count = NUM_PAGES_TO_ALLOC;
+ if (npages < NUM_PAGES_TO_ALLOC)
+ npages = NUM_PAGES_TO_ALLOC;
}
spin_unlock_irqrestore(&pool->lock, irq_flags);
- if (page_count)
- ttm_page_pool_free(pool, page_count);
+ if (npages)
+ ttm_page_pool_free(pool, npages);
}
static void ttm_page_pool_init_locked(struct ttm_page_pool *pool, int flags,
diff --git a/drivers/gpu/drm/ttm/ttm_tt.c b/drivers/gpu/drm/ttm/ttm_tt.c
index 54bbbad..6e079de 100644
--- a/drivers/gpu/drm/ttm/ttm_tt.c
+++ b/drivers/gpu/drm/ttm/ttm_tt.c
@@ -66,22 +66,16 @@ static void ttm_tt_free_page_directory(struct ttm_tt *ttm)
static struct page *__ttm_tt_get_page(struct ttm_tt *ttm, int index)
{
struct page *p;
- struct list_head h;
struct ttm_mem_global *mem_glob = ttm->glob->mem_glob;
int ret;
if (NULL == (p = ttm->pages[index])) {
- INIT_LIST_HEAD(&h);
-
- ret = ttm_get_pages(&h, ttm->page_flags, ttm->caching_state, 1,
+ ret = ttm_get_pages(&p, ttm->page_flags, ttm->caching_state, 1,
&ttm->dma_address[index]);
-
if (ret != 0)
return NULL;
- p = list_first_entry(&h, struct page, lru);
-
ret = ttm_mem_global_alloc_page(mem_glob, p, false, false);
if (unlikely(ret != 0))
goto out_err;
@@ -90,9 +84,7 @@ static struct page *__ttm_tt_get_page(struct ttm_tt *ttm, int index)
}
return p;
out_err:
- INIT_LIST_HEAD(&h);
- list_add(&p->lru, &h);
- ttm_put_pages(&h, 1, ttm->page_flags,
+ ttm_put_pages(&p, 1, ttm->page_flags,
ttm->caching_state, &ttm->dma_address[index]);
return NULL;
}
@@ -243,33 +235,19 @@ EXPORT_SYMBOL(ttm_tt_set_placement_caching);
static void ttm_tt_free_alloced_pages(struct ttm_tt *ttm)
{
- int i;
- unsigned count = 0;
- struct list_head h;
- struct page *cur_page;
struct ttm_backend *be = ttm->be;
-
- INIT_LIST_HEAD(&h);
+ unsigned i;
if (be)
be->func->clear(be);
for (i = 0; i < ttm->num_pages; ++i) {
-
- cur_page = ttm->pages[i];
- ttm->pages[i] = NULL;
- if (cur_page) {
- if (page_count(cur_page) != 1)
- printk(KERN_ERR TTM_PFX
- "Erroneous page count. "
- "Leaking pages.\n");
+ if (ttm->pages[i]) {
ttm_mem_global_free_page(ttm->glob->mem_glob,
- cur_page);
- list_add(&cur_page->lru, &h);
- count++;
+ ttm->pages[i]);
+ ttm_put_pages(&ttm->pages[i], 1, ttm->page_flags,
+ ttm->caching_state, &ttm->dma_address[i]);
}
}
- ttm_put_pages(&h, count, ttm->page_flags, ttm->caching_state,
- ttm->dma_address);
ttm->state = tt_unpopulated;
}
diff --git a/include/drm/ttm/ttm_page_alloc.h b/include/drm/ttm/ttm_page_alloc.h
index 129de12..fe61c8d 100644
--- a/include/drm/ttm/ttm_page_alloc.h
+++ b/include/drm/ttm/ttm_page_alloc.h
@@ -38,10 +38,10 @@
* @count: number of pages to allocate.
* @dma_address: The DMA (bus) address of pages (if TTM_PAGE_FLAG_DMA32 set).
*/
-int ttm_get_pages(struct list_head *pages,
+int ttm_get_pages(struct page **pages,
int flags,
enum ttm_caching_state cstate,
- unsigned count,
+ unsigned npages,
dma_addr_t *dma_address);
/**
* Put linked list of pages to pool.
@@ -53,8 +53,8 @@ int ttm_get_pages(struct list_head *pages,
* @cstate: ttm caching state.
* @dma_address: The DMA (bus) address of pages (if TTM_PAGE_FLAG_DMA32 set).
*/
-void ttm_put_pages(struct list_head *pages,
- unsigned page_count,
+void ttm_put_pages(struct page **pages,
+ unsigned npages,
int flags,
enum ttm_caching_state cstate,
dma_addr_t *dma_address);
--
1.7.7.1
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