Commit 26b02a1f authored by Sasha Levin's avatar Sasha Levin Committed by Linus Torvalds

mm: cma: allocation trigger

Provides a userspace interface to trigger a CMA allocation.

Usage:

        echo [pages] > alloc

This would provide testing/fuzzing access to the CMA allocation paths.
Signed-off-by: default avatarSasha Levin <sasha.levin@oracle.com>
Acked-by: default avatarJoonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Laura Abbott <lauraa@codeaurora.org>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 28b24c1f
...@@ -123,6 +123,12 @@ static int __init cma_activate_area(struct cma *cma) ...@@ -123,6 +123,12 @@ static int __init cma_activate_area(struct cma *cma)
} while (--i); } while (--i);
mutex_init(&cma->lock); mutex_init(&cma->lock);
#ifdef CONFIG_CMA_DEBUGFS
INIT_HLIST_HEAD(&cma->mem_head);
spin_lock_init(&cma->mem_head_lock);
#endif
return 0; return 0;
err: err:
......
...@@ -7,6 +7,10 @@ struct cma { ...@@ -7,6 +7,10 @@ struct cma {
unsigned long *bitmap; unsigned long *bitmap;
unsigned int order_per_bit; /* Order of pages represented by one bit */ unsigned int order_per_bit; /* Order of pages represented by one bit */
struct mutex lock; struct mutex lock;
#ifdef CONFIG_CMA_DEBUGFS
struct hlist_head mem_head;
spinlock_t mem_head_lock;
#endif
}; };
extern struct cma cma_areas[MAX_CMA_AREAS]; extern struct cma cma_areas[MAX_CMA_AREAS];
......
...@@ -7,9 +7,18 @@ ...@@ -7,9 +7,18 @@
#include <linux/debugfs.h> #include <linux/debugfs.h>
#include <linux/cma.h> #include <linux/cma.h>
#include <linux/list.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include "cma.h" #include "cma.h"
struct cma_mem {
struct hlist_node node;
struct page *p;
unsigned long n;
};
static struct dentry *cma_debugfs_root; static struct dentry *cma_debugfs_root;
static int cma_debugfs_get(void *data, u64 *val) static int cma_debugfs_get(void *data, u64 *val)
...@@ -23,6 +32,46 @@ static int cma_debugfs_get(void *data, u64 *val) ...@@ -23,6 +32,46 @@ static int cma_debugfs_get(void *data, u64 *val)
DEFINE_SIMPLE_ATTRIBUTE(cma_debugfs_fops, cma_debugfs_get, NULL, "%llu\n"); DEFINE_SIMPLE_ATTRIBUTE(cma_debugfs_fops, cma_debugfs_get, NULL, "%llu\n");
static void cma_add_to_cma_mem_list(struct cma *cma, struct cma_mem *mem)
{
spin_lock(&cma->mem_head_lock);
hlist_add_head(&mem->node, &cma->mem_head);
spin_unlock(&cma->mem_head_lock);
}
static int cma_alloc_mem(struct cma *cma, int count)
{
struct cma_mem *mem;
struct page *p;
mem = kzalloc(sizeof(*mem), GFP_KERNEL);
if (!mem)
return -ENOMEM;
p = cma_alloc(cma, count, CONFIG_CMA_ALIGNMENT);
if (!p) {
kfree(mem);
return -ENOMEM;
}
mem->p = p;
mem->n = count;
cma_add_to_cma_mem_list(cma, mem);
return 0;
}
static int cma_alloc_write(void *data, u64 val)
{
int pages = val;
struct cma *cma = data;
return cma_alloc_mem(cma, pages);
}
DEFINE_SIMPLE_ATTRIBUTE(cma_alloc_fops, NULL, cma_alloc_write, "%llu\n");
static void cma_debugfs_add_one(struct cma *cma, int idx) static void cma_debugfs_add_one(struct cma *cma, int idx)
{ {
struct dentry *tmp; struct dentry *tmp;
...@@ -33,6 +82,9 @@ static void cma_debugfs_add_one(struct cma *cma, int idx) ...@@ -33,6 +82,9 @@ static void cma_debugfs_add_one(struct cma *cma, int idx)
tmp = debugfs_create_dir(name, cma_debugfs_root); tmp = debugfs_create_dir(name, cma_debugfs_root);
debugfs_create_file("alloc", S_IWUSR, cma_debugfs_root, cma,
&cma_alloc_fops);
debugfs_create_file("base_pfn", S_IRUGO, tmp, debugfs_create_file("base_pfn", S_IRUGO, tmp,
&cma->base_pfn, &cma_debugfs_fops); &cma->base_pfn, &cma_debugfs_fops);
debugfs_create_file("count", S_IRUGO, tmp, debugfs_create_file("count", S_IRUGO, tmp,
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment