The patch titled
Subject: mm: cma: allocation trigger
has been added to the -mm tree. Its filename is
mm-cma-allocation-trigger.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-cma-allocation-trigger.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-cma-allocation-trigger.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Sasha Levin <sasha.levin@xxxxxxxxxx>
Subject: 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: Sasha Levin <sasha.levin@xxxxxxxxxx>
Acked-by: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Cc: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
Cc: Laura Abbott <lauraa@xxxxxxxxxxxxxx>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/cma.c | 6 +++++
mm/cma.h | 4 +++
mm/cma_debug.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++-
3 files changed, 63 insertions(+), 1 deletion(-)
diff -puN mm/cma.c~mm-cma-allocation-trigger mm/cma.c
--- a/mm/cma.c~mm-cma-allocation-trigger
+++ a/mm/cma.c
@@ -121,6 +121,12 @@ static int __init cma_activate_area(stru
} while (--i);
mutex_init(&cma->lock);
+
+#ifdef CONFIG_CMA_DEBUGFS
+ INIT_HLIST_HEAD(&cma->mem_head);
+ spin_lock_init(&cma->mem_head_lock);
+#endif
+
return 0;
err:
diff -puN mm/cma.h~mm-cma-allocation-trigger mm/cma.h
--- a/mm/cma.h~mm-cma-allocation-trigger
+++ a/mm/cma.h
@@ -7,6 +7,10 @@ struct cma {
unsigned long *bitmap;
unsigned int order_per_bit; /* Order of pages represented by one bit */
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];
diff -puN mm/cma_debug.c~mm-cma-allocation-trigger mm/cma_debug.c
--- a/mm/cma_debug.c~mm-cma-allocation-trigger
+++ a/mm/cma_debug.c
@@ -7,9 +7,18 @@
#include <linux/debugfs.h>
#include <linux/cma.h>
+#include <linux/list.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
#include "cma.h"
+struct cma_mem {
+ struct hlist_node node;
+ struct page *p;
+ unsigned long n;
+};
+
static struct dentry *cma_debugfs_root;
static int cma_debugfs_get(void *data, u64 *val)
@@ -23,6 +32,46 @@ static int cma_debugfs_get(void *data, u
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)
{
struct dentry *tmp;
@@ -33,12 +82,15 @@ static void cma_debugfs_add_one(struct c
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,
&cma->base_pfn, &cma_debugfs_fops);
debugfs_create_file("count", S_IRUGO, tmp,
&cma->count, &cma_debugfs_fops);
debugfs_create_file("order_per_bit", S_IRUGO, tmp,
- &cma->order_per_bit, &cma_debugfs_fops);
+ &cma->order_per_bit, &cma_debugfs_fops);
u32s = DIV_ROUND_UP(cma_bitmap_maxno(cma), BITS_PER_BYTE * sizeof(u32));
debugfs_create_u32_array("bitmap", S_IRUGO, tmp, (u32*)cma->bitmap, u32s);
_
Patches currently in -mm which might be from sasha.levin@xxxxxxxxxx are
origin.patch
mm-cma-debugfs-interface.patch
mm-cma-allocation-trigger.patch
mm-cma-release-trigger.patch
mm-cma-allocation-trigger-fix.patch
linux-next.patch
do_shared_fault-check-that-mmap_sem-is-held.patch
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