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Commit 2e32b947 authored by Dmitry Safonov's avatar Dmitry Safonov Committed by Linus Torvalds
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mm: cma: add functions to get region pages counters 



Here are two functions that provide interface to compute/get used size and
size of biggest free chunk in cma region.  Add that information to
debugfs.

[akpm@linux-foundation.org: move debug code from cma.c into cma_debug.c]
[stefan.strogin@gmail.com: move code from cma_get_used() and cma_get_maxchunk() to cma_used_get() and cma_maxchunk_get()]
Signed-off-by: default avatarDmitry Safonov <d.safonov@partner.samsung.com>
Signed-off-by: default avatarStefan Strogin <stefan.strogin@gmail.com>
Acked-by: default avatarMichal Nazarewicz <mina86@mina86.com>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Pintu Kumar <pintu.k@samsung.com>
Cc: Weijie Yang <weijie.yang@samsung.com>
Cc: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Cc: Vyacheslav Tyrtov <v.tyrtov@samsung.com>
Cc: Aleksei Mateosian <a.mateosian@samsung.com>
Signed-off-by: default avatarStefan Strogin <stefan.strogin@gmail.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 79553da2

mm/cma_debug.c

+40 −0
Original line number Diff line number Diff line
@@ -33,6 +33,44 @@ static int cma_debugfs_get(void *data, u64 *val) 


DEFINE_SIMPLE_ATTRIBUTE(cma_debugfs_fops, cma_debugfs_get, NULL, "%llu\n");



static int cma_used_get(void *data, u64 *val)

{

	struct cma *cma = data;

	unsigned long used;



	mutex_lock(&cma->lock);

	/* pages counter is smaller than sizeof(int) */

	used = bitmap_weight(cma->bitmap, (int)cma->count);

	mutex_unlock(&cma->lock);

	*val = (u64)used << cma->order_per_bit;



	return 0;

}



DEFINE_SIMPLE_ATTRIBUTE(cma_used_fops, cma_used_get, NULL, "%llu\n");



static int cma_maxchunk_get(void *data, u64 *val)

{

	struct cma *cma = data;

	unsigned long maxchunk = 0;

	unsigned long start, end = 0;



	mutex_lock(&cma->lock);

	for (;;) {

		start = find_next_zero_bit(cma->bitmap, cma->count, end);

		if (start >= cma->count)

			break;

		end = find_next_bit(cma->bitmap, cma->count, start);

		maxchunk = max(end - start, maxchunk);

	}

	mutex_unlock(&cma->lock);

	*val = (u64)maxchunk << cma->order_per_bit;



	return 0;

}



DEFINE_SIMPLE_ATTRIBUTE(cma_maxchunk_fops, cma_maxchunk_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);
@@ -149,6 +187,8 @@ static void cma_debugfs_add_one(struct cma *cma, int idx) 
				&cma->count, &cma_debugfs_fops);

	debugfs_create_file("order_per_bit", S_IRUGO, tmp,

				&cma->order_per_bit, &cma_debugfs_fops);

	debugfs_create_file("used", S_IRUGO, tmp, cma, &cma_used_fops);

	debugfs_create_file("maxchunk", S_IRUGO, tmp, cma, &cma_maxchunk_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);