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-rw-r--r--kernel/dma/pool.c94
1 files changed, 59 insertions, 35 deletions
diff --git a/kernel/dma/pool.c b/kernel/dma/pool.c
index 35bb51c31fff..6bc74a2d5127 100644
--- a/kernel/dma/pool.c
+++ b/kernel/dma/pool.c
@@ -6,7 +6,6 @@
#include <linux/debugfs.h>
#include <linux/dma-direct.h>
#include <linux/dma-noncoherent.h>
-#include <linux/dma-contiguous.h>
#include <linux/init.h>
#include <linux/genalloc.h>
#include <linux/set_memory.h>
@@ -69,12 +68,7 @@ static int atomic_pool_expand(struct gen_pool *pool, size_t pool_size,
do {
pool_size = 1 << (PAGE_SHIFT + order);
-
- if (dev_get_cma_area(NULL))
- page = dma_alloc_from_contiguous(NULL, 1 << order,
- order, false);
- else
- page = alloc_pages(gfp, order);
+ page = alloc_pages(gfp, order);
} while (!page && order-- > 0);
if (!page)
goto out;
@@ -118,8 +112,7 @@ remove_mapping:
dma_common_free_remap(addr, pool_size);
#endif
free_page: __maybe_unused
- if (!dma_release_from_contiguous(NULL, page, 1 << order))
- __free_pages(page, order);
+ __free_pages(page, order);
out:
return ret;
}
@@ -175,10 +168,9 @@ static int __init dma_atomic_pool_init(void)
* sizes to 128KB per 1GB of memory, min 128KB, max MAX_ORDER-1.
*/
if (!atomic_pool_size) {
- atomic_pool_size = max(totalram_pages() >> PAGE_SHIFT, 1UL) *
- SZ_128K;
- atomic_pool_size = min_t(size_t, atomic_pool_size,
- 1 << (PAGE_SHIFT + MAX_ORDER-1));
+ unsigned long pages = totalram_pages() / (SZ_1G / SZ_128K);
+ pages = min_t(unsigned long, pages, MAX_ORDER_NR_PAGES);
+ atomic_pool_size = max_t(size_t, pages << PAGE_SHIFT, SZ_128K);
}
INIT_WORK(&atomic_pool_work, atomic_pool_work_fn);
@@ -204,7 +196,7 @@ static int __init dma_atomic_pool_init(void)
}
postcore_initcall(dma_atomic_pool_init);
-static inline struct gen_pool *dev_to_pool(struct device *dev)
+static inline struct gen_pool *dma_guess_pool_from_device(struct device *dev)
{
u64 phys_mask;
gfp_t gfp;
@@ -218,47 +210,79 @@ static inline struct gen_pool *dev_to_pool(struct device *dev)
return atomic_pool_kernel;
}
-static bool dma_in_atomic_pool(struct device *dev, void *start, size_t size)
+static inline struct gen_pool *dma_get_safer_pool(struct gen_pool *bad_pool)
+{
+ if (bad_pool == atomic_pool_kernel)
+ return atomic_pool_dma32 ? : atomic_pool_dma;
+
+ if (bad_pool == atomic_pool_dma32)
+ return atomic_pool_dma;
+
+ return NULL;
+}
+
+static inline struct gen_pool *dma_guess_pool(struct device *dev,
+ struct gen_pool *bad_pool)
{
- struct gen_pool *pool = dev_to_pool(dev);
+ if (bad_pool)
+ return dma_get_safer_pool(bad_pool);
- if (unlikely(!pool))
- return false;
- return gen_pool_has_addr(pool, (unsigned long)start, size);
+ return dma_guess_pool_from_device(dev);
}
void *dma_alloc_from_pool(struct device *dev, size_t size,
struct page **ret_page, gfp_t flags)
{
- struct gen_pool *pool = dev_to_pool(dev);
- unsigned long val;
+ struct gen_pool *pool = NULL;
+ unsigned long val = 0;
void *ptr = NULL;
-
- if (!pool) {
- WARN(1, "%pGg atomic pool not initialised!\n", &flags);
- return NULL;
+ phys_addr_t phys;
+
+ while (1) {
+ pool = dma_guess_pool(dev, pool);
+ if (!pool) {
+ WARN(1, "Failed to get suitable pool for %s\n",
+ dev_name(dev));
+ break;
+ }
+
+ val = gen_pool_alloc(pool, size);
+ if (!val)
+ continue;
+
+ phys = gen_pool_virt_to_phys(pool, val);
+ if (dma_coherent_ok(dev, phys, size))
+ break;
+
+ gen_pool_free(pool, val, size);
+ val = 0;
}
- val = gen_pool_alloc(pool, size);
- if (val) {
- phys_addr_t phys = gen_pool_virt_to_phys(pool, val);
+ if (val) {
*ret_page = pfn_to_page(__phys_to_pfn(phys));
ptr = (void *)val;
memset(ptr, 0, size);
+
+ if (gen_pool_avail(pool) < atomic_pool_size)
+ schedule_work(&atomic_pool_work);
}
- if (gen_pool_avail(pool) < atomic_pool_size)
- schedule_work(&atomic_pool_work);
return ptr;
}
bool dma_free_from_pool(struct device *dev, void *start, size_t size)
{
- struct gen_pool *pool = dev_to_pool(dev);
+ struct gen_pool *pool = NULL;
+
+ while (1) {
+ pool = dma_guess_pool(dev, pool);
+ if (!pool)
+ return false;
- if (!dma_in_atomic_pool(dev, start, size))
- return false;
- gen_pool_free(pool, (unsigned long)start, size);
- return true;
+ if (gen_pool_has_addr(pool, (unsigned long)start, size)) {
+ gen_pool_free(pool, (unsigned long)start, size);
+ return true;
+ }
+ }
}