From 665c12a94bd66a96adfad0b83deb6c6a72fb60e9 Mon Sep 17 00:00:00 2001
From: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Date: Mon, 2 Aug 2010 11:15:17 +0300
Subject: [PATCH] mmc_test: Fix large memory allocation
- Fix mmc_test_alloc_mem.
- Use nr_free_buffer_pages() instead of sysinfo.totalram to
determine total lowmem pages.
- Change variables containing memory sizes to unsigned long.
- Limit maximum test area size to 128MiB because that is the
maximum MMC high capacity erase size (the maxmium SD allocation
unit size is just 4MiB)
Signed-off-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
---
drivers/mmc/card/mmc_test.c | 76 ++++++++++++++++++++++++++----------------
1 files changed, 47 insertions(+), 29 deletions(-)
diff --git a/drivers/mmc/card/mmc_test.c b/drivers/mmc/card/mmc_test.c
index 197f387..5dd8576 100644
--- a/drivers/mmc/card/mmc_test.c
+++ b/drivers/mmc/card/mmc_test.c
@@ -16,6 +16,7 @@
#include <linux/slab.h>
#include <linux/scatterlist.h>
+#include <linux/swap.h> /* For nr_free_buffer_pages() */
#define RESULT_OK 0
#define RESULT_FAIL 1
@@ -25,6 +26,12 @@
#define BUFFER_ORDER 2
#define BUFFER_SIZE (PAGE_SIZE << BUFFER_ORDER)
+/*
+ * Limit the test area size to the maximum MMC HC erase group size. Note that
+ * the maximum SD allocation unit size is just 4MiB.
+ */
+#define TEST_AREA_MAX_SIZE (128 * 1024 * 1024)
+
/**
* struct mmc_test_pages - pages allocated by 'alloc_pages()'.
* @page: first page in the allocation
@@ -47,8 +54,8 @@ struct mmc_test_mem {
/**
* struct mmc_test_area - information for performance tests.
- * @dev_addr: address on card at which to do performance tests
* @max_sz: test area size (in bytes)
+ * @dev_addr: address on card at which to do performance tests
* @max_segs: maximum segments in scatterlist @sg
* @blocks: number of (512 byte) blocks currently mapped by @sg
* @sg_len: length of currently mapped scatterlist @sg
@@ -56,8 +63,8 @@ struct mmc_test_mem {
* @sg: scatterlist
*/
struct mmc_test_area {
+ unsigned long max_sz;
unsigned int dev_addr;
- unsigned int max_sz;
unsigned int max_segs;
unsigned int blocks;
unsigned int sg_len;
@@ -238,20 +245,19 @@ static void mmc_test_free_mem(struct mmc_test_mem *mem)
/*
* Allocate a lot of memory, preferrably max_sz but at least min_sz. In case
- * there isn't much memory do not exceed 1/16th total RAM.
+ * there isn't much memory do not exceed 1/16th total lowmem pages.
*/
-static struct mmc_test_mem *mmc_test_alloc_mem(unsigned int min_sz,
- unsigned int max_sz)
+static struct mmc_test_mem *mmc_test_alloc_mem(unsigned long min_sz,
+ unsigned long max_sz)
{
- unsigned int max_page_cnt = DIV_ROUND_UP(max_sz, PAGE_SIZE);
- unsigned int min_page_cnt = DIV_ROUND_UP(min_sz, PAGE_SIZE);
- unsigned int page_cnt = 0;
+ unsigned long max_page_cnt = DIV_ROUND_UP(max_sz, PAGE_SIZE);
+ unsigned long min_page_cnt = DIV_ROUND_UP(min_sz, PAGE_SIZE);
+ unsigned long page_cnt = 0;
+ unsigned long limit = nr_free_buffer_pages() >> 4;
struct mmc_test_mem *mem;
- struct sysinfo si;
- si_meminfo(&si);
- if (max_page_cnt > si.totalram >> 4)
- max_page_cnt = si.totalram >> 4;
+ if (max_page_cnt > limit)
+ max_page_cnt = limit;
if (max_page_cnt < min_page_cnt)
max_page_cnt = min_page_cnt;
@@ -270,7 +276,7 @@ static struct mmc_test_mem *mmc_test_alloc_mem(unsigned int min_sz,
gfp_t flags = GFP_KERNEL | GFP_DMA | __GFP_NOWARN |
__GFP_NORETRY;
- order = get_order(page_cnt << PAGE_SHIFT);
+ order = get_order(max_page_cnt << PAGE_SHIFT);
while (1) {
page = alloc_pages(flags, order);
if (page || !order)
@@ -285,8 +291,10 @@ static struct mmc_test_mem *mmc_test_alloc_mem(unsigned int min_sz,
mem->arr[mem->cnt].page = page;
mem->arr[mem->cnt].order = order;
mem->cnt += 1;
- max_page_cnt -= 1 << order;
- page_cnt += 1 << order;
+ if (max_page_cnt <= (1UL << order))
+ break;
+ max_page_cnt -= 1UL << order;
+ page_cnt += 1UL << order;
}
return mem;
@@ -300,7 +308,7 @@ out_free:
* Map memory into a scatterlist. Optionally allow the same memory to be
* mapped more than once.
*/
-static int mmc_test_map_sg(struct mmc_test_mem *mem, unsigned int sz,
+static int mmc_test_map_sg(struct mmc_test_mem *mem, unsigned long sz,
struct scatterlist *sglist, int repeat,
unsigned int max_segs, unsigned int *sg_len)
{
@@ -312,7 +320,7 @@ static int mmc_test_map_sg(struct mmc_test_mem *mem, unsigned int sz,
*sg_len = 0;
do {
for (i = 0; i < mem->cnt; i++) {
- unsigned int len = PAGE_SIZE << mem->arr[i].order;
+ unsigned long len = PAGE_SIZE << mem->arr[i].order;
if (sz < len)
len = sz;
@@ -344,13 +352,14 @@ static int mmc_test_map_sg(struct mmc_test_mem *mem, unsigned int sz,
* same memory to be mapped more than once.
*/
static int mmc_test_map_sg_max_scatter(struct mmc_test_mem *mem,
- unsigned int sz,
+ unsigned long sz,
struct scatterlist *sglist,
unsigned int max_segs,
unsigned int *sg_len)
{
struct scatterlist *sg = NULL;
- unsigned int i = mem->cnt, cnt, len;
+ unsigned int i = mem->cnt, cnt;
+ unsigned long len;
void *base, *addr, *last_addr = NULL;
sg_init_table(sglist, max_segs);
@@ -1202,7 +1211,7 @@ static int mmc_test_no_highmem(struct mmc_test_card *test)
/*
* Map sz bytes so that it can be transferred.
*/
-static int mmc_test_area_map(struct mmc_test_card *test, unsigned int sz,
+static int mmc_test_area_map(struct mmc_test_card *test, unsigned long sz,
int max_scatter)
{
struct mmc_test_area *t = &test->area;
@@ -1233,7 +1242,7 @@ static int mmc_test_area_transfer(struct mmc_test_card *test,
/*
* Map and transfer bytes.
*/
-static int mmc_test_area_io(struct mmc_test_card *test, unsigned int sz,
+static int mmc_test_area_io(struct mmc_test_card *test, unsigned long sz,
unsigned int dev_addr, int write, int max_scatter,
int timed)
{
@@ -1308,19 +1317,22 @@ static int mmc_test_area_cleanup(struct mmc_test_card *test)
static int mmc_test_area_init(struct mmc_test_card *test, int erase, int fill)
{
struct mmc_test_area *t = &test->area;
- unsigned int min_sz = 64 * 1024;
+ unsigned long min_sz = 64 * 1024;
int ret;
ret = mmc_test_set_blksize(test, 512);
if (ret)
return ret;
+ if (test->card->pref_erase > TEST_AREA_MAX_SIZE >> 9)
+ t->max_sz = TEST_AREA_MAX_SIZE;
+ else
+ t->max_sz = (unsigned long)test->card->pref_erase << 9;
/*
* Try to allocate enough memory for the whole area. Less is OK
* because the same memory can be mapped into the scatterlist more than
* once.
*/
- t->max_sz = test->card->pref_erase << 9;
t->mem = mmc_test_alloc_mem(min_sz, t->max_sz);
if (!t->mem)
return -ENOMEM;
@@ -1430,7 +1442,8 @@ static int mmc_test_best_write_perf_max_scatter(struct mmc_test_card *test)
*/
static int mmc_test_profile_read_perf(struct mmc_test_card *test)
{
- unsigned int sz, dev_addr;
+ unsigned long sz;
+ unsigned int dev_addr;
int ret;
for (sz = 512; sz < test->area.max_sz; sz <<= 1) {
@@ -1448,7 +1461,8 @@ static int mmc_test_profile_read_perf(struct mmc_test_card *test)
*/
static int mmc_test_profile_write_perf(struct mmc_test_card *test)
{
- unsigned int sz, dev_addr;
+ unsigned long sz;
+ unsigned int dev_addr;
int ret;
ret = mmc_test_area_erase(test);
@@ -1472,7 +1486,8 @@ static int mmc_test_profile_write_perf(struct mmc_test_card *test)
*/
static int mmc_test_profile_trim_perf(struct mmc_test_card *test)
{
- unsigned int sz, dev_addr;
+ unsigned long sz;
+ unsigned int dev_addr;
struct timespec ts1, ts2;
int ret;
@@ -1506,7 +1521,8 @@ static int mmc_test_profile_trim_perf(struct mmc_test_card *test)
*/
static int mmc_test_profile_seq_read_perf(struct mmc_test_card *test)
{
- unsigned int sz, dev_addr, i, cnt;
+ unsigned long sz;
+ unsigned int dev_addr, i, cnt;
struct timespec ts1, ts2;
int ret;
@@ -1531,7 +1547,8 @@ static int mmc_test_profile_seq_read_perf(struct mmc_test_card *test)
*/
static int mmc_test_profile_seq_write_perf(struct mmc_test_card *test)
{
- unsigned int sz, dev_addr, i, cnt;
+ unsigned long sz;
+ unsigned int dev_addr, i, cnt;
struct timespec ts1, ts2;
int ret;
@@ -1559,7 +1576,8 @@ static int mmc_test_profile_seq_write_perf(struct mmc_test_card *test)
*/
static int mmc_test_profile_seq_trim_perf(struct mmc_test_card *test)
{
- unsigned int sz, dev_addr, i, cnt;
+ unsigned long sz;
+ unsigned int dev_addr, i, cnt;
struct timespec ts1, ts2;
int ret;
--
1.6.3.3
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