dma-pool: add pool sizes to debugfs (2edc5bb3) · Commits · 戴 / test

kernel/dma/pool.c

+30 −0

Original line number	Diff line number	Diff line
		@@ -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);

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