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drm/ttm: Pass GFP flags in order to avoid deadlock.
Commit 7dc19d5a
"drivers: convert shrinkers to new count/scan API" added
deadlock warnings that ttm_page_pool_free() and ttm_dma_page_pool_free()
are currently doing GFP_KERNEL allocation.
But these functions did not get updated to receive gfp_t argument.
This patch explicitly passes sc->gfp_mask or GFP_KERNEL to these functions,
and removes the deadlock warning.
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: stable <stable@kernel.org> [2.6.35+]
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
parent
71336e011d
commit
a91576d791
2 changed files with 19 additions and 19 deletions
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@ -297,8 +297,10 @@ static void ttm_pool_update_free_locked(struct ttm_page_pool *pool,
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*
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* @pool: to free the pages from
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* @free_all: If set to true will free all pages in pool
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* @gfp: GFP flags.
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**/
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static int ttm_page_pool_free(struct ttm_page_pool *pool, unsigned nr_free)
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static int ttm_page_pool_free(struct ttm_page_pool *pool, unsigned nr_free,
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gfp_t gfp)
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{
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unsigned long irq_flags;
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struct page *p;
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@ -309,8 +311,7 @@ static int ttm_page_pool_free(struct ttm_page_pool *pool, unsigned nr_free)
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if (NUM_PAGES_TO_ALLOC < nr_free)
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npages_to_free = NUM_PAGES_TO_ALLOC;
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pages_to_free = kmalloc(npages_to_free * sizeof(struct page *),
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GFP_KERNEL);
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pages_to_free = kmalloc(npages_to_free * sizeof(struct page *), gfp);
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if (!pages_to_free) {
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pr_err("Failed to allocate memory for pool free operation\n");
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return 0;
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@ -382,9 +383,7 @@ static int ttm_page_pool_free(struct ttm_page_pool *pool, unsigned nr_free)
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*
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* XXX: (dchinner) Deadlock warning!
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*
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* ttm_page_pool_free() does memory allocation using GFP_KERNEL. that means
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* this can deadlock when called a sc->gfp_mask that is not equal to
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* GFP_KERNEL.
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* We need to pass sc->gfp_mask to ttm_page_pool_free().
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*
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* This code is crying out for a shrinker per pool....
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*/
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@ -408,7 +407,8 @@ ttm_pool_shrink_scan(struct shrinker *shrink, struct shrink_control *sc)
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if (shrink_pages == 0)
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break;
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pool = &_manager->pools[(i + pool_offset)%NUM_POOLS];
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shrink_pages = ttm_page_pool_free(pool, nr_free);
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shrink_pages = ttm_page_pool_free(pool, nr_free,
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sc->gfp_mask);
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freed += nr_free - shrink_pages;
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}
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mutex_unlock(&lock);
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@ -710,7 +710,7 @@ static void ttm_put_pages(struct page **pages, unsigned npages, int flags,
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}
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spin_unlock_irqrestore(&pool->lock, irq_flags);
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if (npages)
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ttm_page_pool_free(pool, npages);
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ttm_page_pool_free(pool, npages, GFP_KERNEL);
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}
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/*
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@ -850,7 +850,8 @@ void ttm_page_alloc_fini(void)
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ttm_pool_mm_shrink_fini(_manager);
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for (i = 0; i < NUM_POOLS; ++i)
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ttm_page_pool_free(&_manager->pools[i], FREE_ALL_PAGES);
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ttm_page_pool_free(&_manager->pools[i], FREE_ALL_PAGES,
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GFP_KERNEL);
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kobject_put(&_manager->kobj);
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_manager = NULL;
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@ -411,8 +411,10 @@ static void ttm_dma_page_put(struct dma_pool *pool, struct dma_page *d_page)
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*
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* @pool: to free the pages from
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* @nr_free: If set to true will free all pages in pool
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* @gfp: GFP flags.
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**/
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static unsigned ttm_dma_page_pool_free(struct dma_pool *pool, unsigned nr_free)
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static unsigned ttm_dma_page_pool_free(struct dma_pool *pool, unsigned nr_free,
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gfp_t gfp)
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{
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unsigned long irq_flags;
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struct dma_page *dma_p, *tmp;
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@ -430,8 +432,7 @@ static unsigned ttm_dma_page_pool_free(struct dma_pool *pool, unsigned nr_free)
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npages_to_free, nr_free);
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}
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#endif
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pages_to_free = kmalloc(npages_to_free * sizeof(struct page *),
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GFP_KERNEL);
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pages_to_free = kmalloc(npages_to_free * sizeof(struct page *), gfp);
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if (!pages_to_free) {
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pr_err("%s: Failed to allocate memory for pool free operation\n",
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@ -530,7 +531,7 @@ static void ttm_dma_free_pool(struct device *dev, enum pool_type type)
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if (pool->type != type)
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continue;
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/* Takes a spinlock.. */
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ttm_dma_page_pool_free(pool, FREE_ALL_PAGES);
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ttm_dma_page_pool_free(pool, FREE_ALL_PAGES, GFP_KERNEL);
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WARN_ON(((pool->npages_in_use + pool->npages_free) != 0));
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/* This code path is called after _all_ references to the
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* struct device has been dropped - so nobody should be
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@ -983,7 +984,7 @@ void ttm_dma_unpopulate(struct ttm_dma_tt *ttm_dma, struct device *dev)
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/* shrink pool if necessary (only on !is_cached pools)*/
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if (npages)
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ttm_dma_page_pool_free(pool, npages);
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ttm_dma_page_pool_free(pool, npages, GFP_KERNEL);
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ttm->state = tt_unpopulated;
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}
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EXPORT_SYMBOL_GPL(ttm_dma_unpopulate);
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@ -993,10 +994,7 @@ EXPORT_SYMBOL_GPL(ttm_dma_unpopulate);
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*
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* XXX: (dchinner) Deadlock warning!
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*
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* ttm_dma_page_pool_free() does GFP_KERNEL memory allocation, and so attention
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* needs to be paid to sc->gfp_mask to determine if this can be done or not.
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* GFP_KERNEL memory allocation in a GFP_ATOMIC reclaim context woul dbe really
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* bad.
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* We need to pass sc->gfp_mask to ttm_dma_page_pool_free().
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*
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* I'm getting sadder as I hear more pathetical whimpers about needing per-pool
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* shrinkers
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@ -1030,7 +1028,8 @@ ttm_dma_pool_shrink_scan(struct shrinker *shrink, struct shrink_control *sc)
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if (++idx < pool_offset)
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continue;
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nr_free = shrink_pages;
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shrink_pages = ttm_dma_page_pool_free(p->pool, nr_free);
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shrink_pages = ttm_dma_page_pool_free(p->pool, nr_free,
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sc->gfp_mask);
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freed += nr_free - shrink_pages;
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pr_debug("%s: (%s:%d) Asked to shrink %d, have %d more to go\n",
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