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Commit 6ed4e2e6 authored by Christian König's avatar Christian König Committed by Alex Deucher
Browse files

drm/ttm: add transparent huge page support for wc or uc allocations v2 



Add a new huge page pool and try to allocate from it when it makes sense.

v2: avoid compound pages for now

Signed-off-by: default avatarChristian König <christian.koenig@amd.com>
Acked-by: default avatarAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 8593e9b8

drivers/gpu/drm/ttm/ttm_page_alloc.c

+109 −27
Original line number Diff line number Diff line
@@ -95,7 +95,7 @@ struct ttm_pool_opts { 
	unsigned	small;

};



#define NUM_POOLS 4

#define NUM_POOLS 6



/**

 * struct ttm_pool_manager - Holds memory pools for fst allocation
@@ -122,6 +122,8 @@ struct ttm_pool_manager { 
			struct ttm_page_pool	uc_pool;

			struct ttm_page_pool	wc_pool_dma32;

			struct ttm_page_pool	uc_pool_dma32;

			struct ttm_page_pool	wc_pool_huge;

			struct ttm_page_pool	uc_pool_huge;

		} ;

	};

};
@@ -256,7 +258,7 @@ static int set_pages_array_uc(struct page **pages, int addrinarray) 


/**

 * Select the right pool or requested caching state and ttm flags. */

static struct ttm_page_pool *ttm_get_pool(int flags,

static struct ttm_page_pool *ttm_get_pool(int flags, bool huge,

					  enum ttm_caching_state cstate)

{

	int pool_index;
@@ -269,9 +271,15 @@ static struct ttm_page_pool *ttm_get_pool(int flags, 
	else

		pool_index = 0x1;



	if (flags & TTM_PAGE_FLAG_DMA32)

	if (flags & TTM_PAGE_FLAG_DMA32) {

		if (huge)

			return NULL;

		pool_index |= 0x2;



	} else if (huge) {

		pool_index |= 0x4;

	}



	return &_manager->pools[pool_index];

}
@@ -494,12 +502,14 @@ static void ttm_handle_caching_state_failure(struct list_head *pages, 
 * 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)

			       int ttm_flags, enum ttm_caching_state cstate,

			       unsigned count, unsigned order)

{

	struct page **caching_array;

	struct page *p;

	int r = 0;

	unsigned i, cpages;

	unsigned i, j, cpages;

	unsigned npages = 1 << order;

	unsigned max_cpages = min(count,

			(unsigned)(PAGE_SIZE/sizeof(struct page *)));
@@ -512,7 +522,7 @@ static int ttm_alloc_new_pages(struct list_head *pages, gfp_t gfp_flags, 
	}



	for (i = 0, cpages = 0; i < count; ++i) {

		p = alloc_page(gfp_flags);

		p = alloc_pages(gfp_flags, order);



		if (!p) {

			pr_err("Unable to get page %u\n", i);
@@ -531,14 +541,18 @@ static int ttm_alloc_new_pages(struct list_head *pages, gfp_t gfp_flags, 
			goto out;

		}



		list_add(&p->lru, pages);



#ifdef CONFIG_HIGHMEM

		/* gfp flags of highmem page should never be dma32 so we

		 * we should be fine in such case

		 */

		if (!PageHighMem(p))

		if (PageHighMem(p))

			continue;



#endif

		{

			caching_array[cpages++] = p;

		for (j = 0; j < npages; ++j) {

			caching_array[cpages++] = p++;

			if (cpages == max_cpages) {



				r = ttm_set_pages_caching(caching_array,
@@ -552,8 +566,6 @@ static int ttm_alloc_new_pages(struct list_head *pages, gfp_t gfp_flags, 
				cpages = 0;

			}

		}



		list_add(&p->lru, pages);

	}



	if (cpages) {
@@ -573,9 +585,9 @@ static int ttm_alloc_new_pages(struct list_head *pages, gfp_t gfp_flags, 
 * 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)

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;
@@ -605,7 +617,7 @@ static void ttm_page_pool_fill_locked(struct ttm_page_pool *pool, 


		INIT_LIST_HEAD(&new_pages);

		r = ttm_alloc_new_pages(&new_pages, pool->gfp_flags, ttm_flags,

				cstate,	alloc_size);

					cstate, alloc_size, 0);

		spin_lock_irqsave(&pool->lock, *irq_flags);



		if (!r) {
@@ -635,7 +647,7 @@ static int 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 count, unsigned order)

{

	unsigned long irq_flags;

	struct list_head *p;
@@ -643,7 +655,9 @@ static int ttm_page_pool_get_pages(struct ttm_page_pool *pool, 
	int r = 0;



	spin_lock_irqsave(&pool->lock, irq_flags);

	ttm_page_pool_fill_locked(pool, ttm_flags, cstate, count, &irq_flags);

	if (!order)

		ttm_page_pool_fill_locked(pool, ttm_flags, cstate, count,

					  &irq_flags);



	if (count >= pool->npages) {

		/* take all pages from the pool */
@@ -698,7 +712,7 @@ static int ttm_page_pool_get_pages(struct ttm_page_pool *pool, 
		 * multiple requests in parallel.

		 **/

		r = ttm_alloc_new_pages(pages, gfp_flags, ttm_flags, cstate,

					count);

					count, order);

	}



	return r;
@@ -708,8 +722,9 @@ static int ttm_page_pool_get_pages(struct ttm_page_pool *pool, 
static void ttm_put_pages(struct page **pages, unsigned npages, int flags,

			  enum ttm_caching_state cstate)

{

	struct ttm_page_pool *pool = ttm_get_pool(flags, false, cstate);

	struct ttm_page_pool *huge = ttm_get_pool(flags, true, cstate);

	unsigned long irq_flags;

	struct ttm_page_pool *pool = ttm_get_pool(flags, cstate);

	unsigned i;



	if (pool == NULL) {
@@ -737,8 +752,48 @@ static void ttm_put_pages(struct page **pages, unsigned npages, int flags, 
		return;

	}



	i = 0;

#ifdef CONFIG_TRANSPARENT_HUGEPAGE

	if (huge) {

		unsigned max_size, n2free;



		spin_lock_irqsave(&huge->lock, irq_flags);

		while (i < npages) {

			struct page *p = pages[i];

			unsigned j;



			if (!p)

				break;



			for (j = 0; j < HPAGE_PMD_NR; ++j)

				if (p++ != pages[i + j])

				    break;



			if (j != HPAGE_PMD_NR)

				break;



			list_add_tail(&pages[i]->lru, &huge->list);



			for (j = 0; j < HPAGE_PMD_NR; ++j)

				pages[i++] = NULL;

			huge->npages++;

		}



		/* Check that we don't go over the pool limit */

		max_size = _manager->options.max_size;

		max_size /= HPAGE_PMD_NR;

		if (huge->npages > max_size)

			n2free = huge->npages - max_size;

		else

			n2free = 0;

		spin_unlock_irqrestore(&huge->lock, irq_flags);

		if (n2free)

			ttm_page_pool_free(huge, n2free, false);

	}

#endif



	spin_lock_irqsave(&pool->lock, irq_flags);

	for (i = 0; i < npages; i++) {

	while (i < npages) {

		if (pages[i]) {

			if (page_count(pages[i]) != 1)

				pr_err("Erroneous page count. Leaking pages.\n");
@@ -746,6 +801,7 @@ static void ttm_put_pages(struct page **pages, unsigned npages, int flags, 
			pages[i] = NULL;

			pool->npages++;

		}

		++i;

	}

	/* Check that we don't go over the pool limit */

	npages = 0;
@@ -768,7 +824,8 @@ static void ttm_put_pages(struct page **pages, unsigned npages, int flags, 
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, false, cstate);

	struct ttm_page_pool *huge = ttm_get_pool(flags, true, cstate);

	struct list_head plist;

	struct page *p = NULL;

	unsigned count;
@@ -821,11 +878,28 @@ static int ttm_get_pages(struct page **pages, unsigned npages, int flags, 
		return 0;

	}



	/* First we take pages from the pool */

	count = 0;



#ifdef CONFIG_TRANSPARENT_HUGEPAGE

	if (huge && npages >= HPAGE_PMD_NR) {

		INIT_LIST_HEAD(&plist);

		ttm_page_pool_get_pages(huge, &plist, flags, cstate,

					npages / HPAGE_PMD_NR,

					HPAGE_PMD_ORDER);



		list_for_each_entry(p, &plist, lru) {

			unsigned j;



			for (j = 0; j < HPAGE_PMD_NR; ++j)

				pages[count++] = &p[j];

		}

	}

#endif



	INIT_LIST_HEAD(&plist);

	r = ttm_page_pool_get_pages(pool, &plist, flags, cstate, npages);

	r = ttm_page_pool_get_pages(pool, &plist, flags, cstate,

				    npages - count, 0);



	count = 0;

	list_for_each_entry(p, &plist, lru)

		pages[count++] = p;
@@ -872,6 +946,14 @@ int ttm_page_alloc_init(struct ttm_mem_global *glob, unsigned max_pages) 
	ttm_page_pool_init_locked(&_manager->uc_pool_dma32,

				  GFP_USER | GFP_DMA32, "uc dma");



	ttm_page_pool_init_locked(&_manager->wc_pool_huge,

				  GFP_TRANSHUGE	& ~(__GFP_MOVABLE | __GFP_COMP),

				  "wc huge");



	ttm_page_pool_init_locked(&_manager->uc_pool_huge,

				  GFP_TRANSHUGE	& ~(__GFP_MOVABLE | __GFP_COMP)

				  , "uc huge");



	_manager->options.max_size = max_pages;

	_manager->options.small = SMALL_ALLOCATION;

	_manager->options.alloc_size = NUM_PAGES_TO_ALLOC;
@@ -1041,12 +1123,12 @@ int ttm_page_alloc_debugfs(struct seq_file *m, void *data) 
		seq_printf(m, "No pool allocator running.\n");

		return 0;

	}

	seq_printf(m, "%6s %12s %13s %8s\n",

	seq_printf(m, "%7s %12s %13s %8s\n",

			h[0], h[1], h[2], h[3]);

	for (i = 0; i < NUM_POOLS; ++i) {

		p = &_manager->pools[i];



		seq_printf(m, "%6s %12ld %13ld %8d\n",

		seq_printf(m, "%7s %12ld %13ld %8d\n",

				p->name, p->nrefills,

				p->nfrees, p->npages);

	}