From 1403b1a38e8b19a4cc17e2c158e278628943a436 Mon Sep 17 00:00:00 2001 From: Pauli Nieminen Date: Thu, 1 Apr 2010 12:44:57 +0000 Subject: drm/ttm: add pool wc/uc page allocator V3 On AGP system we might allocate/free routinely uncached or wc memory, changing page from cached (wb) to uc or wc is very expensive and involves a lot of flushing. To improve performance this allocator use a pool of uc,wc pages. Pools are protected with spinlocks to allow multiple threads to allocate pages simultanously. Expensive operations are done outside of spinlock to maximize concurrency. Pools are linked lists of pages that were recently freed. mm shrink callback allows kernel to claim back pages when they are required for something else. Fixes: * set_pages_array_wb handles highmem pages so we don't have to remove them from pool. * Add count parameter to ttm_put_pages to avoid looping in free code. * Change looping from _safe to normal in pool fill error path. * Initialize sum variable and make the loop prettier in get_num_unused_pages. * Moved pages_freed reseting inside the loop in ttm_page_pool_free. * Add warning comment about spinlock context in ttm_page_pool_free. Based on Jerome Glisse's and Dave Airlie's pool allocator. Signed-off-by: Jerome Glisse Signed-off-by: Dave Airlie Signed-off-by: Pauli Nieminen Reviewed-by: Jerome Glisse Signed-off-by: Dave Airlie --- drivers/gpu/drm/ttm/Makefile | 2 +- drivers/gpu/drm/ttm/ttm_memory.c | 7 +- drivers/gpu/drm/ttm/ttm_page_alloc.c | 711 +++++++++++++++++++++++++++++++++++ drivers/gpu/drm/ttm/ttm_tt.c | 44 ++- 4 files changed, 739 insertions(+), 25 deletions(-) create mode 100644 drivers/gpu/drm/ttm/ttm_page_alloc.c (limited to 'drivers/gpu') diff --git a/drivers/gpu/drm/ttm/Makefile b/drivers/gpu/drm/ttm/Makefile index 1e138f5..4256e20 100644 --- a/drivers/gpu/drm/ttm/Makefile +++ b/drivers/gpu/drm/ttm/Makefile @@ -4,6 +4,6 @@ ccflags-y := -Iinclude/drm ttm-y := ttm_agp_backend.o ttm_memory.o ttm_tt.o ttm_bo.o \ ttm_bo_util.o ttm_bo_vm.o ttm_module.o ttm_global.o \ - ttm_object.o ttm_lock.o ttm_execbuf_util.o + ttm_object.o ttm_lock.o ttm_execbuf_util.o ttm_page_alloc.o obj-$(CONFIG_DRM_TTM) += ttm.o diff --git a/drivers/gpu/drm/ttm/ttm_memory.c b/drivers/gpu/drm/ttm/ttm_memory.c index c40e5f4..daff8a8 100644 --- a/drivers/gpu/drm/ttm/ttm_memory.c +++ b/drivers/gpu/drm/ttm/ttm_memory.c @@ -27,6 +27,7 @@ #include "ttm/ttm_memory.h" #include "ttm/ttm_module.h" +#include "ttm/ttm_page_alloc.h" #include #include #include @@ -392,6 +393,7 @@ int ttm_mem_global_init(struct ttm_mem_global *glob) "Zone %7s: Available graphics memory: %llu kiB.\n", zone->name, (unsigned long long) zone->max_mem >> 10); } + ttm_page_alloc_init(glob->zone_kernel->max_mem/(2*PAGE_SIZE)); return 0; out_no_zone: ttm_mem_global_release(glob); @@ -404,6 +406,9 @@ 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(); + flush_workqueue(glob->swap_queue); destroy_workqueue(glob->swap_queue); glob->swap_queue = NULL; @@ -411,7 +416,7 @@ void ttm_mem_global_release(struct ttm_mem_global *glob) zone = glob->zones[i]; kobject_del(&zone->kobj); kobject_put(&zone->kobj); - } + } kobject_del(&glob->kobj); kobject_put(&glob->kobj); } diff --git a/drivers/gpu/drm/ttm/ttm_page_alloc.c b/drivers/gpu/drm/ttm/ttm_page_alloc.c new file mode 100644 index 0000000..f46e40b --- /dev/null +++ b/drivers/gpu/drm/ttm/ttm_page_alloc.c @@ -0,0 +1,711 @@ +/* + * Copyright (c) Red Hat Inc. + + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sub license, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the + * next paragraph) shall be included in all copies or substantial portions + * of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER + * DEALINGS IN THE SOFTWARE. + * + * Authors: Dave Airlie + * Jerome Glisse + * Pauli Nieminen + */ + +/* simple list based uncached page pool + * - Pool collects resently freed pages for reuse + * - Use page->lru to keep a free list + * - doesn't track currently in use pages + */ +#include +#include +#include +#include +#include + +#include +#include + +#include "ttm/ttm_bo_driver.h" +#include "ttm/ttm_page_alloc.h" + + +#define NUM_PAGES_TO_ALLOC (PAGE_SIZE/sizeof(struct page *)) +#define SMALL_ALLOCATION 16 +#define FREE_ALL_PAGES (~0U) +/* times are in msecs */ +#define PAGE_FREE_INTERVAL 1000 + +/** + * struct ttm_page_pool - Pool to reuse recently allocated uc/wc pages. + * + * @lock: Protects the shared pool from concurrnet access. Must be used with + * irqsave/irqrestore variants because pool allocator maybe called from + * delayed work. + * @fill_lock: Prevent concurrent calls to fill. + * @list: Pool of free uc/wc pages for fast reuse. + * @gfp_flags: Flags to pass for alloc_page. + * @npages: Number of pages in pool. + */ +struct ttm_page_pool { + spinlock_t lock; + bool fill_lock; + struct list_head list; + int gfp_flags; + unsigned npages; +}; + +struct ttm_pool_opts { + unsigned alloc_size; + unsigned max_size; + unsigned small; +}; + +#define NUM_POOLS 4 + +/** + * struct ttm_pool_manager - Holds memory pools for fst allocation + * + * Manager is read only object for pool code so it doesn't need locking. + * + * @free_interval: minimum number of jiffies between freeing pages from pool. + * @page_alloc_inited: reference counting for pool allocation. + * @work: Work that is used to shrink the pool. Work is only run when there is + * some pages to free. + * @small_allocation: Limit in number of pages what is small allocation. + * + * @pools: All pool objects in use. + **/ +struct ttm_pool_manager { + struct shrinker mm_shrink; + atomic_t page_alloc_inited; + struct ttm_pool_opts options; + + union { + struct ttm_page_pool pools[NUM_POOLS]; + struct { + struct ttm_page_pool wc_pool; + struct ttm_page_pool uc_pool; + struct ttm_page_pool wc_pool_dma32; + struct ttm_page_pool uc_pool_dma32; + } ; + }; +}; + +static struct ttm_pool_manager _manager = { + .page_alloc_inited = ATOMIC_INIT(0) +}; + +#ifdef CONFIG_X86 +/* TODO: add this to x86 like _uc, this version here is inefficient */ +static int set_pages_array_wc(struct page **pages, int addrinarray) +{ + int i; + + for (i = 0; i < addrinarray; i++) + set_memory_wc((unsigned long)page_address(pages[i]), 1); + return 0; +} +#else +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, + enum ttm_caching_state cstate) +{ + int pool_index; + + if (cstate == tt_cached) + return NULL; + + if (cstate == tt_wc) + pool_index = 0x0; + else + pool_index = 0x1; + + if (flags & TTM_PAGE_FLAG_DMA32) + pool_index |= 0x2; + + return &_manager.pools[pool_index]; +} + +/* set memory back to wb and free the pages. */ +static void ttm_pages_put(struct page *pages[], unsigned npages) +{ + unsigned i; + if (set_pages_array_wb(pages, npages)) + printk(KERN_ERR "[ttm] Failed to set %d pages to wb!\n", + npages); + for (i = 0; i < npages; ++i) + __free_page(pages[i]); +} + +static void ttm_pool_update_free_locked(struct ttm_page_pool *pool, + unsigned freed_pages) +{ + pool->npages -= 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) { + printk(KERN_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 tough 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; +} + +/* Get good estimation how many pages are free in pools */ +static int ttm_pool_get_num_unused_pages(void) +{ + unsigned i; + int total = 0; + for (i = 0; i < NUM_POOLS; ++i) + total += _manager.pools[i].npages; + + return total; +} + +/** + * Calback for mm to request pool to reduce number of page held. + */ +static int ttm_pool_mm_shrink(int shrink_pages, gfp_t gfp_mask) +{ + static atomic_t start_pool = ATOMIC_INIT(0); + unsigned i; + unsigned pool_offset = atomic_add_return(1, &start_pool); + struct ttm_page_pool *pool; + + 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); + } + /* return estimated number of unused pages in pool */ + return ttm_pool_get_num_unused_pages(); +} + +static void ttm_pool_mm_shrink_init(struct ttm_pool_manager *manager) +{ + manager->mm_shrink.shrink = &ttm_pool_mm_shrink; + 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) + printk(KERN_ERR "[ttm] Failed to set %d pages to uc!\n", + cpages); + break; + case tt_wc: + r = set_pages_array_wc(pages, cpages); + if (r) + printk(KERN_ERR "[ttm] 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 has to be reed */ + 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, int 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) { + printk(KERN_ERR "[ttm] unable to allocate table for new pages."); + return -ENOMEM; + } + + for (i = 0, cpages = 0; i < count; ++i) { + p = alloc_page(gfp_flags); + + if (!p) { + printk(KERN_ERR "[ttm] 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 isn't enough pages and 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 is not enough + * pages in pool we fill the pool 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->npages += alloc_size; + } else { + printk(KERN_ERR "[ttm] Failed to fill pool (%p).", 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 nubmer of pages from the pool and put them to return list + * + * @return count of pages still to allocate to fill 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 halves 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 pool */ + list_cut_position(pages, &pool->list, p); + pool->npages -= count; + count = 0; +out: + spin_unlock_irqrestore(&pool->lock, irq_flags); + return count; +} + +/* + * 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) +{ + struct ttm_page_pool *pool = ttm_get_pool(flags, cstate); + struct page *p = NULL; + int gfp_flags = 0; + int r; + + /* 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_HIGHMEM; + + for (r = 0; r < count; ++r) { + p = alloc_page(gfp_flags); + if (!p) { + + printk(KERN_ERR "[ttm] unable to allocate page."); + return -ENOMEM; + } + + list_add(&p->lru, pages); + } + 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); + + /* clear the pages coming from the pool if requested */ + if (flags & TTM_PAGE_FLAG_ZERO_ALLOC) { + list_for_each_entry(p, pages, lru) { + clear_page(page_address(p)); + } + } + + /* If pool didn't have enough pages allocate new one. */ + if (count > 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); + if (r) { + /* If there is any pages in the list put them back to + * the pool. */ + printk(KERN_ERR "[ttm] Failed to allocate extra pages " + "for large request."); + ttm_put_pages(pages, 0, flags, cstate); + 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, + enum ttm_caching_state cstate) +{ + unsigned long irq_flags; + struct ttm_page_pool *pool = ttm_get_pool(flags, cstate); + struct page *p, *tmp; + + 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); + } + /* 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; + /* Check that we don't go over the pool limit */ + page_count = 0; + if (pool->npages > _manager.options.max_size) { + page_count = 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; + } + spin_unlock_irqrestore(&pool->lock, irq_flags); + if (page_count) + ttm_page_pool_free(pool, page_count); +} + +static void ttm_page_pool_init_locked(struct ttm_page_pool *pool, int flags) +{ + spin_lock_init(&pool->lock); + pool->fill_lock = false; + INIT_LIST_HEAD(&pool->list); + pool->npages = 0; + pool->gfp_flags = flags; +} + +int ttm_page_alloc_init(unsigned max_pages) +{ + if (atomic_add_return(1, &_manager.page_alloc_inited) > 1) + return 0; + + printk(KERN_INFO "[ttm] Initializing pool allocator.\n"); + + ttm_page_pool_init_locked(&_manager.wc_pool, GFP_HIGHUSER); + + ttm_page_pool_init_locked(&_manager.uc_pool, GFP_HIGHUSER); + + ttm_page_pool_init_locked(&_manager.wc_pool_dma32, GFP_USER | GFP_DMA32); + + ttm_page_pool_init_locked(&_manager.uc_pool_dma32, GFP_USER | GFP_DMA32); + + _manager.options.max_size = max_pages; + _manager.options.small = SMALL_ALLOCATION; + _manager.options.alloc_size = NUM_PAGES_TO_ALLOC; + + ttm_pool_mm_shrink_init(&_manager); + + return 0; +} + +void ttm_page_alloc_fini() +{ + int i; + + if (atomic_sub_return(1, &_manager.page_alloc_inited) > 0) + return; + + printk(KERN_INFO "[ttm] Finilizing 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); +} diff --git a/drivers/gpu/drm/ttm/ttm_tt.c b/drivers/gpu/drm/ttm/ttm_tt.c index bab6cd8..a3269ef 100644 --- a/drivers/gpu/drm/ttm/ttm_tt.c +++ b/drivers/gpu/drm/ttm/ttm_tt.c @@ -38,6 +38,7 @@ #include "ttm/ttm_module.h" #include "ttm/ttm_bo_driver.h" #include "ttm/ttm_placement.h" +#include "ttm/ttm_page_alloc.h" static int ttm_tt_swapin(struct ttm_tt *ttm); @@ -55,21 +56,6 @@ static void ttm_tt_free_page_directory(struct ttm_tt *ttm) ttm->pages = NULL; } -static struct page *ttm_tt_alloc_page(unsigned page_flags) -{ - gfp_t gfp_flags = GFP_USER; - - if (page_flags & TTM_PAGE_FLAG_ZERO_ALLOC) - gfp_flags |= __GFP_ZERO; - - if (page_flags & TTM_PAGE_FLAG_DMA32) - gfp_flags |= __GFP_DMA32; - else - gfp_flags |= __GFP_HIGHMEM; - - return alloc_page(gfp_flags); -} - static void ttm_tt_free_user_pages(struct ttm_tt *ttm) { int write; @@ -110,15 +96,21 @@ static void ttm_tt_free_user_pages(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; while (NULL == (p = ttm->pages[index])) { - p = ttm_tt_alloc_page(ttm->page_flags); - if (!p) + INIT_LIST_HEAD(&h); + + ret = ttm_get_pages(&h, ttm->page_flags, ttm->caching_state, 1); + + 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; @@ -227,10 +219,10 @@ static int ttm_tt_set_caching(struct ttm_tt *ttm, if (ttm->caching_state == c_state) return 0; - if (c_state != tt_cached) { - ret = ttm_tt_populate(ttm); - if (unlikely(ret != 0)) - return ret; + if (ttm->state == tt_unpopulated) { + /* Change caching but don't populate */ + ttm->caching_state = c_state; + return 0; } if (ttm->caching_state == tt_cached) @@ -281,13 +273,17 @@ 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); + if (be) be->func->clear(be); - (void)ttm_tt_set_caching(ttm, tt_cached); for (i = 0; i < ttm->num_pages; ++i) { + cur_page = ttm->pages[i]; ttm->pages[i] = NULL; if (cur_page) { @@ -297,9 +293,11 @@ static void ttm_tt_free_alloced_pages(struct ttm_tt *ttm) "Leaking pages.\n"); ttm_mem_global_free_page(ttm->glob->mem_glob, cur_page); - __free_page(cur_page); + list_add(&cur_page->lru, &h); + count++; } } + ttm_put_pages(&h, count, ttm->page_flags, ttm->caching_state); ttm->state = tt_unpopulated; ttm->first_himem_page = ttm->num_pages; ttm->last_lomem_page = -1; -- cgit v1.1 From 0745866165598b067442c472911280527b08be3e Mon Sep 17 00:00:00 2001 From: Pauli Nieminen Date: Thu, 1 Apr 2010 12:44:58 +0000 Subject: drm/ttm: Add debugfs output entry to pool allocator. ttm_page_alloc_debugfs can be registered to output the state of pools. Debugfs file will output number of pages freed from the pool, number of pages in pool now and the lowes number of pages in pool since previous shrink. Signed-off-by: Pauli Nieminen Signed-off-by: Dave Airlie --- drivers/gpu/drm/ttm/ttm_page_alloc.c | 45 ++++++++++++++++++++++++++++++------ 1 file changed, 38 insertions(+), 7 deletions(-) (limited to 'drivers/gpu') diff --git a/drivers/gpu/drm/ttm/ttm_page_alloc.c b/drivers/gpu/drm/ttm/ttm_page_alloc.c index f46e40b..f82bf80 100644 --- a/drivers/gpu/drm/ttm/ttm_page_alloc.c +++ b/drivers/gpu/drm/ttm/ttm_page_alloc.c @@ -34,6 +34,7 @@ #include #include #include +#include #include #include @@ -66,6 +67,9 @@ struct ttm_page_pool { struct list_head list; int gfp_flags; unsigned npages; + char *name; + unsigned long nfrees; + unsigned long nrefills; }; struct ttm_pool_opts { @@ -190,6 +194,7 @@ static void ttm_pool_update_free_locked(struct ttm_page_pool *pool, unsigned freed_pages) { pool->npages -= freed_pages; + pool->nfrees += freed_pages; } /** @@ -263,7 +268,6 @@ restart: } } - /* remove range of pages from the pool */ if (freed_pages) { __list_del(&p->lru, &pool->list); @@ -490,6 +494,7 @@ static void ttm_page_pool_fill_locked(struct ttm_page_pool *pool, if (!r) { list_splice(&new_pages, &pool->list); + ++pool->nrefills; pool->npages += alloc_size; } else { printk(KERN_ERR "[ttm] Failed to fill pool (%p).", pool); @@ -663,13 +668,15 @@ void ttm_put_pages(struct list_head *pages, unsigned page_count, int flags, ttm_page_pool_free(pool, page_count); } -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, int flags, + char *name) { spin_lock_init(&pool->lock); pool->fill_lock = false; INIT_LIST_HEAD(&pool->list); - pool->npages = 0; + pool->npages = pool->nfrees = 0; pool->gfp_flags = flags; + pool->name = name; } int ttm_page_alloc_init(unsigned max_pages) @@ -679,13 +686,15 @@ int ttm_page_alloc_init(unsigned max_pages) printk(KERN_INFO "[ttm] Initializing pool allocator.\n"); - ttm_page_pool_init_locked(&_manager.wc_pool, GFP_HIGHUSER); + ttm_page_pool_init_locked(&_manager.wc_pool, GFP_HIGHUSER, "wc"); - ttm_page_pool_init_locked(&_manager.uc_pool, GFP_HIGHUSER); + ttm_page_pool_init_locked(&_manager.uc_pool, GFP_HIGHUSER, "uc"); - ttm_page_pool_init_locked(&_manager.wc_pool_dma32, GFP_USER | GFP_DMA32); + 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); + 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; @@ -709,3 +718,25 @@ void ttm_page_alloc_fini() for (i = 0; i < NUM_POOLS; ++i) ttm_page_pool_free(&_manager.pools[i], FREE_ALL_PAGES); } + +int ttm_page_alloc_debugfs(struct seq_file *m, void *data) +{ + struct ttm_page_pool *p; + unsigned i; + char *h[] = {"pool", "refills", "pages freed", "size"}; + if (atomic_read(&_manager.page_alloc_inited) == 0) { + seq_printf(m, "No pool allocator running.\n"); + return 0; + } + seq_printf(m, "%6s %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", + p->name, p->nrefills, + p->nfrees, p->npages); + } + return 0; +} +EXPORT_SYMBOL(ttm_page_alloc_debugfs); -- cgit v1.1 From 8d7cddcd7f9e847cec44851ca53fd3e81e846c49 Mon Sep 17 00:00:00 2001 From: Pauli Nieminen Date: Thu, 1 Apr 2010 12:44:59 +0000 Subject: drm/radeon/kms: Add ttm page pool debugfs file. ttm_page_pool file is hooked ttm_page_alloc_debugfs for pool allocator state. Signed-off-by: Pauli Nieminen Signed-off-by: Dave Airlie --- drivers/gpu/drm/radeon/radeon_ttm.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) (limited to 'drivers/gpu') diff --git a/drivers/gpu/drm/radeon/radeon_ttm.c b/drivers/gpu/drm/radeon/radeon_ttm.c index 43c5ab3..fc787e8 100644 --- a/drivers/gpu/drm/radeon/radeon_ttm.c +++ b/drivers/gpu/drm/radeon/radeon_ttm.c @@ -33,6 +33,7 @@ #include #include #include +#include #include #include #include @@ -744,8 +745,8 @@ static int radeon_mm_dump_table(struct seq_file *m, void *data) static int radeon_ttm_debugfs_init(struct radeon_device *rdev) { #if defined(CONFIG_DEBUG_FS) - static struct drm_info_list radeon_mem_types_list[RADEON_DEBUGFS_MEM_TYPES]; - static char radeon_mem_types_names[RADEON_DEBUGFS_MEM_TYPES][32]; + static struct drm_info_list radeon_mem_types_list[RADEON_DEBUGFS_MEM_TYPES+1]; + static char radeon_mem_types_names[RADEON_DEBUGFS_MEM_TYPES+1][32]; unsigned i; for (i = 0; i < RADEON_DEBUGFS_MEM_TYPES; i++) { @@ -762,7 +763,13 @@ static int radeon_ttm_debugfs_init(struct radeon_device *rdev) radeon_mem_types_list[i].data = &rdev->mman.bdev.man[TTM_PL_TT].manager; } - return radeon_debugfs_add_files(rdev, radeon_mem_types_list, RADEON_DEBUGFS_MEM_TYPES); + /* Add ttm page pool to debugfs */ + sprintf(radeon_mem_types_names[i], "ttm_page_pool"); + radeon_mem_types_list[i].name = radeon_mem_types_names[i]; + radeon_mem_types_list[i].show = &ttm_page_alloc_debugfs; + radeon_mem_types_list[i].driver_features = 0; + radeon_mem_types_list[i].data = NULL; + return radeon_debugfs_add_files(rdev, radeon_mem_types_list, RADEON_DEBUGFS_MEM_TYPES+1); #endif return 0; -- cgit v1.1 From bf62acdef89cb5b294668a6a747f7411dfe2ea7d Mon Sep 17 00:00:00 2001 From: Pauli Nieminen Date: Thu, 1 Apr 2010 12:45:00 +0000 Subject: drm/nouveau: Add ttm page pool debugfs file. ttm_page_pool file is hooked ttm_page_alloc_debugfs for pool allocator state. Signed-off-by: Pauli Nieminen Signed-off-by: Dave Airlie --- drivers/gpu/drm/nouveau/nouveau_debugfs.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'drivers/gpu') diff --git a/drivers/gpu/drm/nouveau/nouveau_debugfs.c b/drivers/gpu/drm/nouveau/nouveau_debugfs.c index 8ff9ef5..59416c8 100644 --- a/drivers/gpu/drm/nouveau/nouveau_debugfs.c +++ b/drivers/gpu/drm/nouveau/nouveau_debugfs.c @@ -33,6 +33,8 @@ #include "drmP.h" #include "nouveau_drv.h" +#include + static int nouveau_debugfs_channel_info(struct seq_file *m, void *data) { @@ -160,6 +162,7 @@ static struct drm_info_list nouveau_debugfs_list[] = { { "chipset", nouveau_debugfs_chipset_info, 0, NULL }, { "memory", nouveau_debugfs_memory_info, 0, NULL }, { "vbios.rom", nouveau_debugfs_vbios_image, 0, NULL }, + { "ttm_page_pool", ttm_page_alloc_debugfs, 0, NULL }, }; #define NOUVEAU_DEBUGFS_ENTRIES ARRAY_SIZE(nouveau_debugfs_list) -- cgit v1.1 From 975efdb1bf925ad48d4e3fe5339a85f12601e10d Mon Sep 17 00:00:00 2001 From: Pauli Nieminen Date: Thu, 1 Apr 2010 12:45:02 +0000 Subject: drm/ttm: Use set_pages_array_wc instead of set_memory_wc. Using single call to set multiple pages to wc reduces number of expensive cache flushes. Signed-off-by: Pauli Nieminen Signed-off-by: Dave Airlie --- drivers/gpu/drm/ttm/ttm_page_alloc.c | 12 +----------- 1 file changed, 1 insertion(+), 11 deletions(-) (limited to 'drivers/gpu') diff --git a/drivers/gpu/drm/ttm/ttm_page_alloc.c b/drivers/gpu/drm/ttm/ttm_page_alloc.c index f82bf80..57799db 100644 --- a/drivers/gpu/drm/ttm/ttm_page_alloc.c +++ b/drivers/gpu/drm/ttm/ttm_page_alloc.c @@ -113,17 +113,7 @@ static struct ttm_pool_manager _manager = { .page_alloc_inited = ATOMIC_INIT(0) }; -#ifdef CONFIG_X86 -/* TODO: add this to x86 like _uc, this version here is inefficient */ -static int set_pages_array_wc(struct page **pages, int addrinarray) -{ - int i; - - for (i = 0; i < addrinarray; i++) - set_memory_wc((unsigned long)page_address(pages[i]), 1); - return 0; -} -#else +#ifndef CONFIG_X86 static int set_pages_array_wb(struct page **pages, int addrinarray) { #ifdef TTM_HAS_AGP -- cgit v1.1 From c96af79e3463d5d3f865625baa8bb8aa4c0944a0 Mon Sep 17 00:00:00 2001 From: Pauli Nieminen Date: Thu, 1 Apr 2010 12:45:03 +0000 Subject: drm/ttm: Add sysfs interface to control pool allocator. Sysfs interface allows user to configure pool allocator functionality and change limits for the size of pool. Signed-off-by: Pauli Nieminen Signed-off-by: Dave Airlie --- drivers/gpu/drm/ttm/ttm_memory.c | 2 +- drivers/gpu/drm/ttm/ttm_page_alloc.c | 113 ++++++++++++++++++++++++++++++++++- 2 files changed, 113 insertions(+), 2 deletions(-) (limited to 'drivers/gpu') diff --git a/drivers/gpu/drm/ttm/ttm_memory.c b/drivers/gpu/drm/ttm/ttm_memory.c index daff8a8..5e3f177 100644 --- a/drivers/gpu/drm/ttm/ttm_memory.c +++ b/drivers/gpu/drm/ttm/ttm_memory.c @@ -393,7 +393,7 @@ int ttm_mem_global_init(struct ttm_mem_global *glob) "Zone %7s: Available graphics memory: %llu kiB.\n", zone->name, (unsigned long long) zone->max_mem >> 10); } - ttm_page_alloc_init(glob->zone_kernel->max_mem/(2*PAGE_SIZE)); + ttm_page_alloc_init(glob, glob->zone_kernel->max_mem/(2*PAGE_SIZE)); return 0; out_no_zone: ttm_mem_global_release(glob); diff --git a/drivers/gpu/drm/ttm/ttm_page_alloc.c b/drivers/gpu/drm/ttm/ttm_page_alloc.c index 57799db..6ca9b27 100644 --- a/drivers/gpu/drm/ttm/ttm_page_alloc.c +++ b/drivers/gpu/drm/ttm/ttm_page_alloc.c @@ -72,6 +72,12 @@ struct ttm_page_pool { unsigned long nrefills; }; +/** + * Limits for the pool. They are handled without locks because only place where + * they may change is in sysfs store. They won't have immediate effect anyway + * so forcing serialiazation to access them is pointless. + */ + struct ttm_pool_opts { unsigned alloc_size; unsigned max_size; @@ -94,6 +100,7 @@ struct ttm_pool_opts { * @pools: All pool objects in use. **/ struct ttm_pool_manager { + struct kobject kobj; struct shrinker mm_shrink; atomic_t page_alloc_inited; struct ttm_pool_opts options; @@ -109,6 +116,100 @@ struct ttm_pool_manager { }; }; +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); + (void)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) { + printk(KERN_ERR "[ttm] Setting allocation size to %lu " + "is not allowed. Recomended 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) { + printk(KERN_WARNING "[ttm] Setting allocation size to " + "larger than %lu is not recomended.\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 = { .page_alloc_inited = ATOMIC_INIT(0) }; @@ -669,8 +770,9 @@ static void ttm_page_pool_init_locked(struct ttm_page_pool *pool, int flags, pool->name = name; } -int ttm_page_alloc_init(unsigned max_pages) +int ttm_page_alloc_init(struct ttm_mem_global *glob, unsigned max_pages) { + int ret; if (atomic_add_return(1, &_manager.page_alloc_inited) > 1) return 0; @@ -690,6 +792,13 @@ int ttm_page_alloc_init(unsigned max_pages) _manager.options.small = SMALL_ALLOCATION; _manager.options.alloc_size = NUM_PAGES_TO_ALLOC; + kobject_init(&_manager.kobj, &ttm_pool_kobj_type); + ret = kobject_add(&_manager.kobj, &glob->kobj, "pool"); + if (unlikely(ret != 0)) { + kobject_put(&_manager.kobj); + return ret; + } + ttm_pool_mm_shrink_init(&_manager); return 0; @@ -707,6 +816,8 @@ void ttm_page_alloc_fini() for (i = 0; i < NUM_POOLS; ++i) ttm_page_pool_free(&_manager.pools[i], FREE_ALL_PAGES); + + kobject_put(&_manager.kobj); } int ttm_page_alloc_debugfs(struct seq_file *m, void *data) -- cgit v1.1 From 4cdc840a371bbaf635b1d47bd8bf67a0b804538e Mon Sep 17 00:00:00 2001 From: Matt Turner Date: Wed, 7 Apr 2010 22:42:04 +0000 Subject: drm/ttm: include linux/seq_file.h for seq_printf Fixes drivers/gpu/drm/ttm/ttm_page_alloc.c: In function 'ttm_page_alloc_debugfs': drivers/gpu/drm/ttm/ttm_page_alloc.c:829: error: implicit declaration of function 'seq_printf' Signed-off-by: Matt Turner Signed-off-by: Dave Airlie --- drivers/gpu/drm/ttm/ttm_page_alloc.c | 1 + 1 file changed, 1 insertion(+) (limited to 'drivers/gpu') diff --git a/drivers/gpu/drm/ttm/ttm_page_alloc.c b/drivers/gpu/drm/ttm/ttm_page_alloc.c index 6ca9b27..2ad2dc9 100644 --- a/drivers/gpu/drm/ttm/ttm_page_alloc.c +++ b/drivers/gpu/drm/ttm/ttm_page_alloc.c @@ -36,6 +36,7 @@ #include #include #include +#include /* for seq_printf */ #include #include -- cgit v1.1 From 2125b8a44d771351fc44719ed291be70b73672ad Mon Sep 17 00:00:00 2001 From: Stephen Rothwell Date: Thu, 8 Apr 2010 13:42:03 +1000 Subject: drm/ttm: using kmalloc/kfree requires including slab.h Signed-off-by: Stephen Rothwell Signed-off-by: Dave Airlie --- drivers/gpu/drm/ttm/ttm_page_alloc.c | 1 + 1 file changed, 1 insertion(+) (limited to 'drivers/gpu') diff --git a/drivers/gpu/drm/ttm/ttm_page_alloc.c b/drivers/gpu/drm/ttm/ttm_page_alloc.c index 2ad2dc9..0d9a42c 100644 --- a/drivers/gpu/drm/ttm/ttm_page_alloc.c +++ b/drivers/gpu/drm/ttm/ttm_page_alloc.c @@ -37,6 +37,7 @@ #include #include #include /* for seq_printf */ +#include #include #include -- cgit v1.1