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lib: sparse: allocate FASTBOOT_MAX_BLK_WRITE instead of small number

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Commit 62649165cb ("lib: sparse: Make CHUNK_TYPE_RAW buffer aligned")
fixed cache alignment for systems with a D-CACHE.

However it introduced some performance regressions [1] on system
flashing huge images, such as Android.

On AM62x SK EVM, we also observe such performance penalty:
Sending sparse 'super' 1/2 (768793 KB)             OKAY [ 23.954s]
Writing 'super'                                    OKAY [ 75.926s]
Sending sparse 'super' 2/2 (629819 KB)             OKAY [ 19.641s]
Writing 'super'                                    OKAY [ 62.849s]
Finished. Total time: 182.474s

The reason for this is that we use an arbitrary small buffer
(info->blksz * 100) for transferring.

Fix it by using a bigger buffer (info->blksz * FASTBOOT_MAX_BLK_WRITE)
as suggested in the original's patch review [2].

With this patch, performance impact is mitigated:
Sending sparse 'super' 1/2 (768793 KB)             OKAY [ 23.912s]
Writing 'super'                                    OKAY [ 15.780s]
Sending sparse 'super' 2/2 (629819 KB)             OKAY [ 19.581s]
Writing 'super'                                    OKAY [ 17.192s]
Finished. Total time: 76.569s

[1] https://lore.kernel.org/r/20221118121323.4009193-1-gary.bisson@boundarydevices.com
[2] https://lore.kernel.org/r/all/43e4c17c-4483-ec8e-f843-9b4c5569bd18@seco.com/

Fixes: 62649165cb ("lib: sparse: Make CHUNK_TYPE_RAW buffer aligned")
Signed-off-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
This commit is contained in:
Mattijs Korpershoek 2023-07-07 10:13:34 +02:00 • committed by Tom Rini
parent 8fd6e64c95
commit b1aade87ca
3 changed files with 4 additions and 3 deletions
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2
drivers/fastboot/fb_mmc.c
View file

@ -19,8 +19,6 @@
#include <linux/compat.h>
#include <android_image.h>
#define FASTBOOT_MAX_BLK_WRITE 16384
#define BOOT_PARTITION_NAME "boot"
struct fb_mmc_sparse {

2
include/image-sparse.h
View file

@ -7,6 +7,8 @@
#include <part.h>
#include <sparse_format.h>
#define FASTBOOT_MAX_BLK_WRITE 16384
#define ROUNDUP(x, y) (((x) + ((y) - 1)) & ~((y) - 1))
struct sparse_storage {

3
lib/image-sparse.c
View file

@ -55,7 +55,8 @@ static lbaint_t write_sparse_chunk_raw(struct sparse_storage *info,
void *data,
char *response)
{
lbaint_t n = blkcnt, write_blks, blks = 0, aligned_buf_blks = 100;
lbaint_t n = blkcnt, write_blks, blks = 0;
lbaint_t aligned_buf_blks = FASTBOOT_MAX_BLK_WRITE;
uint32_t *aligned_buf = NULL;
if (CONFIG_IS_ENABLED(SYS_DCACHE_OFF)) {