dma-pool: add pool sizes to debugfs
The atomic DMA pools can dynamically expand based on non-blocking allocations that need to use it. Export the sizes of each of these pools, in bytes, through debugfs for measurement. Suggested-by: Christoph Hellwig <hch@lst.de> Signed-off-by: David Rientjes <rientjes@google.com> [hch: remove the !CONFIG_DEBUG_FS stubs] Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
parent
76a19940bd
commit
2edc5bb3c5
|
@ -3,6 +3,7 @@
|
|||
* Copyright (C) 2012 ARM Ltd.
|
||||
* Copyright (C) 2020 Google LLC
|
||||
*/
|
||||
#include <linux/debugfs.h>
|
||||
#include <linux/dma-direct.h>
|
||||
#include <linux/dma-noncoherent.h>
|
||||
#include <linux/dma-contiguous.h>
|
||||
|
@ -13,8 +14,11 @@
|
|||
#include <linux/workqueue.h>
|
||||
|
||||
static struct gen_pool *atomic_pool_dma __ro_after_init;
|
||||
static unsigned long pool_size_dma;
|
||||
static struct gen_pool *atomic_pool_dma32 __ro_after_init;
|
||||
static unsigned long pool_size_dma32;
|
||||
static struct gen_pool *atomic_pool_kernel __ro_after_init;
|
||||
static unsigned long pool_size_kernel;
|
||||
|
||||
#define DEFAULT_DMA_COHERENT_POOL_SIZE SZ_256K
|
||||
static size_t atomic_pool_size = DEFAULT_DMA_COHERENT_POOL_SIZE;
|
||||
|
@ -29,6 +33,29 @@ static int __init early_coherent_pool(char *p)
|
|||
}
|
||||
early_param("coherent_pool", early_coherent_pool);
|
||||
|
||||
static void __init dma_atomic_pool_debugfs_init(void)
|
||||
{
|
||||
struct dentry *root;
|
||||
|
||||
root = debugfs_create_dir("dma_pools", NULL);
|
||||
if (IS_ERR_OR_NULL(root))
|
||||
return;
|
||||
|
||||
debugfs_create_ulong("pool_size_dma", 0400, root, &pool_size_dma);
|
||||
debugfs_create_ulong("pool_size_dma32", 0400, root, &pool_size_dma32);
|
||||
debugfs_create_ulong("pool_size_kernel", 0400, root, &pool_size_kernel);
|
||||
}
|
||||
|
||||
static void dma_atomic_pool_size_add(gfp_t gfp, size_t size)
|
||||
{
|
||||
if (gfp & __GFP_DMA)
|
||||
pool_size_dma += size;
|
||||
else if (gfp & __GFP_DMA32)
|
||||
pool_size_dma32 += size;
|
||||
else
|
||||
pool_size_kernel += size;
|
||||
}
|
||||
|
||||
static int atomic_pool_expand(struct gen_pool *pool, size_t pool_size,
|
||||
gfp_t gfp)
|
||||
{
|
||||
|
@ -76,6 +103,7 @@ static int atomic_pool_expand(struct gen_pool *pool, size_t pool_size,
|
|||
if (ret)
|
||||
goto encrypt_mapping;
|
||||
|
||||
dma_atomic_pool_size_add(gfp, pool_size);
|
||||
return 0;
|
||||
|
||||
encrypt_mapping:
|
||||
|
@ -160,6 +188,8 @@ static int __init dma_atomic_pool_init(void)
|
|||
if (!atomic_pool_dma32)
|
||||
ret = -ENOMEM;
|
||||
}
|
||||
|
||||
dma_atomic_pool_debugfs_init();
|
||||
return ret;
|
||||
}
|
||||
postcore_initcall(dma_atomic_pool_init);
|
||||
|
|
Loading…
Reference in a new issue