diff options
| author | Huang Shijie <b32955@freescale.com> | 2013-04-08 16:56:46 +0800 |
|---|---|---|
| committer | Gao Pan <pandy.gao@nxp.com> | 2016-03-28 12:52:54 +0800 |
| commit | 3456a5863c6dafb9e76daa9afe19016f19c88f26 (patch) | |
| tree | eaa6fdbc7c794777dbf883bcf912e8c9584aa9c1 /include | |
| parent | d410e45243d2597fe0e192b3e2c482b92fdd3050 (diff) | |
MLK-10934 mtd: use memcpy to replace the memcpy_fromio
During the read of NOR, the kernel actually calls the inline_map_copy_from()
to read the data out. And inline_map_copy_from() will use the memcpy_fromio()
to do the real job.
The memcpy_fromio macro maps _memcpy_fromio() in the current code.
But the _memcpy_fromio() will use readb() to do the copy work one byte
by one byte. This makes the read performance of NOR very slow(about 2~3MB/s).
A similiar discussion could be found in:
http://lists.infradead.org/pipermail/linux-arm-kernel/2009-November/003860.html
This patch replace the memcpy_fromio with memcpy which is optimized by the
kernel.
The following is the result from mtd_speedtest with M29W256GL7AN6E:
=================================================
mtd_speedtest: MTD device: 2
mtd_speedtest: not NAND flash, assume page size is 512 bytes.
mtd_speedtest: MTD device size 4194304, eraseblock size 131072, page size 512,
count of eraseblocks 32, pages per eraseblock 256, OOB size 0
mtd_speedtest: testing eraseblock write speed
mtd_speedtest: eraseblock write speed is 845 KiB/s
mtd_speedtest: testing eraseblock read speed
mtd_speedtest: eraseblock read speed is 19504 KiB/s
mtd_speedtest: testing page write speed
mtd_speedtest: page write speed is 845 KiB/s
mtd_speedtest: testing page read speed
mtd_speedtest: page read speed is 19140 KiB/s
mtd_speedtest: testing 2 page write speed
mtd_speedtest: 2 page write speed is 846 KiB/s
mtd_speedtest: testing 2 page read speed
mtd_speedtest: 2 page read speed is 19320 KiB/s
mtd_speedtest: Testing erase speed
mtd_speedtest: erase speed is 233 KiB/s
mtd_speedtest: Testing 2x multi-block erase speed
mtd_speedtest: 2x multi-block erase speed is 225 KiB/s
mtd_speedtest: Testing 4x multi-block erase speed
mtd_speedtest: 4x multi-block erase speed is 224 KiB/s
mtd_speedtest: Testing 8x multi-block erase speed
mtd_speedtest: 8x multi-block erase speed is 225 KiB/s
mtd_speedtest: Testing 16x multi-block erase speed
mtd_speedtest: 16x multi-block erase speed is 225 KiB/s
mtd_speedtest: Testing 32x multi-block erase speed
mtd_speedtest: 32x multi-block erase speed is 225 KiB/s
mtd_speedtest: Testing 64x multi-block erase speed
mtd_speedtest: 64x multi-block erase speed is 224 KiB/s
mtd_speedtest: finished
=================================================
(cherry-picked from: f1e5914ffd82d5326cbd30507d4f37d02a0da099)
Signed-off-by: Huang Shijie <b32955@freescale.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/mtd/map.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/mtd/map.h b/include/linux/mtd/map.h index 29975c73a953..ef9b126639cc 100644 --- a/include/linux/mtd/map.h +++ b/include/linux/mtd/map.h @@ -454,7 +454,7 @@ static inline void inline_map_copy_from(struct map_info *map, void *to, unsigned if (map->cached) memcpy(to, (char *)map->cached + from, len); else - memcpy_fromio(to, map->virt + from, len); + memcpy(to, map->virt + from, len); } static inline void inline_map_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len) |