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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:
David Rientjes 2020-04-14 17:04:59 -07:00 committed by Christoph Hellwig
parent 76a19940bd
commit 2edc5bb3c5
1 changed files with 30 additions and 0 deletions
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30
kernel/dma/pool.c
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@ -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);