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Subject[PATCH 2/2] staging: android: ion: Combine cache and uncache pools
Date
Now we call dma_map in the dma_buf API callbacks and handle explicit
caching by the dma_buf sync API, which make cache and uncache pools
in the same handling flow, which can be combined.

Signed-off-by: Yisheng Xie <xieyisheng1@huawei.com>
---
drivers/staging/android/ion/ion.c | 5 --
drivers/staging/android/ion/ion.h | 13 +----
drivers/staging/android/ion/ion_page_pool.c | 5 +-
drivers/staging/android/ion/ion_system_heap.c | 76 +++++----------------------
4 files changed, 16 insertions(+), 83 deletions(-)

diff --git a/drivers/staging/android/ion/ion.c b/drivers/staging/android/ion/ion.c
index 461b193..c094be2 100644
--- a/drivers/staging/android/ion/ion.c
+++ b/drivers/staging/android/ion/ion.c
@@ -33,11 +33,6 @@
static struct ion_device *internal_dev;
static int heap_id;

-bool ion_buffer_cached(struct ion_buffer *buffer)
-{
- return !!(buffer->flags & ION_FLAG_CACHED);
-}
-
/* this function should only be called while dev->lock is held */
static void ion_buffer_add(struct ion_device *dev,
struct ion_buffer *buffer)
diff --git a/drivers/staging/android/ion/ion.h b/drivers/staging/android/ion/ion.h
index 1bc443f..ea08978 100644
--- a/drivers/staging/android/ion/ion.h
+++ b/drivers/staging/android/ion/ion.h
@@ -185,14 +185,6 @@ struct ion_heap {
};

/**
- * ion_buffer_cached - this ion buffer is cached
- * @buffer: buffer
- *
- * indicates whether this ion buffer is cached
- */
-bool ion_buffer_cached(struct ion_buffer *buffer);
-
-/**
* ion_device_add_heap - adds a heap to the ion device
* @heap: the heap to add
*/
@@ -302,7 +294,6 @@ size_t ion_heap_freelist_shrink(struct ion_heap *heap,
* @gfp_mask: gfp_mask to use from alloc
* @order: order of pages in the pool
* @list: plist node for list of pools
- * @cached: it's cached pool or not
*
* Allows you to keep a pool of pre allocated pages to use from your heap.
* Keeping a pool of pages that is ready for dma, ie any cached mapping have
@@ -312,7 +303,6 @@ size_t ion_heap_freelist_shrink(struct ion_heap *heap,
struct ion_page_pool {
int high_count;
int low_count;
- bool cached;
struct list_head high_items;
struct list_head low_items;
struct mutex mutex;
@@ -321,8 +311,7 @@ struct ion_page_pool {
struct plist_node list;
};

-struct ion_page_pool *ion_page_pool_create(gfp_t gfp_mask, unsigned int order,
- bool cached);
+struct ion_page_pool *ion_page_pool_create(gfp_t gfp_mask, unsigned int order);
void ion_page_pool_destroy(struct ion_page_pool *pool);
struct page *ion_page_pool_alloc(struct ion_page_pool *pool);
void ion_page_pool_free(struct ion_page_pool *pool, struct page *page);
diff --git a/drivers/staging/android/ion/ion_page_pool.c b/drivers/staging/android/ion/ion_page_pool.c
index 6d2caf0..db8f614 100644
--- a/drivers/staging/android/ion/ion_page_pool.c
+++ b/drivers/staging/android/ion/ion_page_pool.c
@@ -123,8 +123,7 @@ int ion_page_pool_shrink(struct ion_page_pool *pool, gfp_t gfp_mask,
return freed;
}

-struct ion_page_pool *ion_page_pool_create(gfp_t gfp_mask, unsigned int order,
- bool cached)
+struct ion_page_pool *ion_page_pool_create(gfp_t gfp_mask, unsigned int order)
{
struct ion_page_pool *pool = kmalloc(sizeof(*pool), GFP_KERNEL);

@@ -138,8 +137,6 @@ struct ion_page_pool *ion_page_pool_create(gfp_t gfp_mask, unsigned int order,
pool->order = order;
mutex_init(&pool->mutex);
plist_node_init(&pool->list, order);
- if (cached)
- pool->cached = true;

return pool;
}
diff --git a/drivers/staging/android/ion/ion_system_heap.c b/drivers/staging/android/ion/ion_system_heap.c
index bc19cdd..701eb9f 100644
--- a/drivers/staging/android/ion/ion_system_heap.c
+++ b/drivers/staging/android/ion/ion_system_heap.c
@@ -41,31 +41,16 @@ static inline unsigned int order_to_size(int order)

struct ion_system_heap {
struct ion_heap heap;
- struct ion_page_pool *uncached_pools[NUM_ORDERS];
- struct ion_page_pool *cached_pools[NUM_ORDERS];
+ struct ion_page_pool *pools[NUM_ORDERS];
};

-/**
- * The page from page-pool are all zeroed before. We need do cache
- * clean for cached buffer. The uncached buffer are always non-cached
- * since it's allocated. So no need for non-cached pages.
- */
static struct page *alloc_buffer_page(struct ion_system_heap *heap,
struct ion_buffer *buffer,
unsigned long order)
{
- bool cached = ion_buffer_cached(buffer);
- struct ion_page_pool *pool;
- struct page *page;
+ struct ion_page_pool *pool = heap->pools[order_to_index(order)];

- if (!cached)
- pool = heap->uncached_pools[order_to_index(order)];
- else
- pool = heap->cached_pools[order_to_index(order)];
-
- page = ion_page_pool_alloc(pool);
-
- return page;
+ return ion_page_pool_alloc(pool);
}

static void free_buffer_page(struct ion_system_heap *heap,
@@ -73,7 +58,6 @@ static void free_buffer_page(struct ion_system_heap *heap,
{
struct ion_page_pool *pool;
unsigned int order = compound_order(page);
- bool cached = ion_buffer_cached(buffer);

/* go to system */
if (buffer->private_flags & ION_PRIV_FLAG_SHRINKER_FREE) {
@@ -81,10 +65,7 @@ static void free_buffer_page(struct ion_system_heap *heap,
return;
}

- if (!cached)
- pool = heap->uncached_pools[order_to_index(order)];
- else
- pool = heap->cached_pools[order_to_index(order)];
+ pool = heap->pools[order_to_index(order)];

ion_page_pool_free(pool, page);
}
@@ -190,8 +171,7 @@ static void ion_system_heap_free(struct ion_buffer *buffer)
static int ion_system_heap_shrink(struct ion_heap *heap, gfp_t gfp_mask,
int nr_to_scan)
{
- struct ion_page_pool *uncached_pool;
- struct ion_page_pool *cached_pool;
+ struct ion_page_pool *pool;
struct ion_system_heap *sys_heap;
int nr_total = 0;
int i, nr_freed;
@@ -203,26 +183,15 @@ static int ion_system_heap_shrink(struct ion_heap *heap, gfp_t gfp_mask,
only_scan = 1;

for (i = 0; i < NUM_ORDERS; i++) {
- uncached_pool = sys_heap->uncached_pools[i];
- cached_pool = sys_heap->cached_pools[i];
+ pool = sys_heap->pools[i];

if (only_scan) {
- nr_total += ion_page_pool_shrink(uncached_pool,
+ nr_total += ion_page_pool_shrink(pool,
gfp_mask,
nr_to_scan);

- nr_total += ion_page_pool_shrink(cached_pool,
- gfp_mask,
- nr_to_scan);
} else {
- nr_freed = ion_page_pool_shrink(uncached_pool,
- gfp_mask,
- nr_to_scan);
- nr_to_scan -= nr_freed;
- nr_total += nr_freed;
- if (nr_to_scan <= 0)
- break;
- nr_freed = ion_page_pool_shrink(cached_pool,
+ nr_freed = ion_page_pool_shrink(pool,
gfp_mask,
nr_to_scan);
nr_to_scan -= nr_freed;
@@ -253,26 +222,16 @@ static int ion_system_heap_debug_show(struct ion_heap *heap, struct seq_file *s,
struct ion_page_pool *pool;

for (i = 0; i < NUM_ORDERS; i++) {
- pool = sys_heap->uncached_pools[i];
+ pool = sys_heap->pools[i];

- seq_printf(s, "%d order %u highmem pages uncached %lu total\n",
+ seq_printf(s, "%d order %u highmem pages %lu total\n",
pool->high_count, pool->order,
(PAGE_SIZE << pool->order) * pool->high_count);
- seq_printf(s, "%d order %u lowmem pages uncached %lu total\n",
+ seq_printf(s, "%d order %u lowmem pages %lu total\n",
pool->low_count, pool->order,
(PAGE_SIZE << pool->order) * pool->low_count);
}

- for (i = 0; i < NUM_ORDERS; i++) {
- pool = sys_heap->cached_pools[i];
-
- seq_printf(s, "%d order %u highmem pages cached %lu total\n",
- pool->high_count, pool->order,
- (PAGE_SIZE << pool->order) * pool->high_count);
- seq_printf(s, "%d order %u lowmem pages cached %lu total\n",
- pool->low_count, pool->order,
- (PAGE_SIZE << pool->order) * pool->low_count);
- }
return 0;
}

@@ -285,8 +244,7 @@ static void ion_system_heap_destroy_pools(struct ion_page_pool **pools)
ion_page_pool_destroy(pools[i]);
}

-static int ion_system_heap_create_pools(struct ion_page_pool **pools,
- bool cached)
+static int ion_system_heap_create_pools(struct ion_page_pool **pools)
{
int i;
gfp_t gfp_flags = low_order_gfp_flags;
@@ -297,7 +255,7 @@ static int ion_system_heap_create_pools(struct ion_page_pool **pools,
if (orders[i] > 4)
gfp_flags = high_order_gfp_flags;

- pool = ion_page_pool_create(gfp_flags, orders[i], cached);
+ pool = ion_page_pool_create(gfp_flags, orders[i]);
if (!pool)
goto err_create_pool;
pools[i] = pool;
@@ -320,18 +278,12 @@ static struct ion_heap *__ion_system_heap_create(void)
heap->heap.type = ION_HEAP_TYPE_SYSTEM;
heap->heap.flags = ION_HEAP_FLAG_DEFER_FREE;

- if (ion_system_heap_create_pools(heap->uncached_pools, false))
+ if (ion_system_heap_create_pools(heap->pools))
goto free_heap;

- if (ion_system_heap_create_pools(heap->cached_pools, true))
- goto destroy_uncached_pools;
-
heap->heap.debug_show = ion_system_heap_debug_show;
return &heap->heap;

-destroy_uncached_pools:
- ion_system_heap_destroy_pools(heap->uncached_pools);
-
free_heap:
kfree(heap);
return ERR_PTR(-ENOMEM);
--
1.7.12.4
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