[U-Boot] [PATCH 0/3] Add cache for block devices

Eric Nelson
2016-03-27T19:00:12Z

Patch 1 is the block cache implementation.

Patches 2 and 3 update the mmc and sata commands to use the new
blk_dread/dwrite/derase routines and can be applied separately.

Notable changes since the V2 RFC patch set include:
- renaming of files and routines to use "blkcache" rather
than "cache_block" to make things consistent with the
command name.

- implemented through the blk_dread/dwrite/derase routines
in blk.h instead of drivers/mmc.

- added detection of device (re)initialization in disk/part.c

- changed the default max blocks/entry and entries to
2 and 32 respectively based on further testing.

- changed to sub-command implementation as suggested by
Stephen Warren.

- changed interface to cache_find per Stephen's suggestion

I tested with and without DM and compile-tested with CONFIG_BLK
enabled, but only on MMC and USB devices.

As a teaser, here are some performance numbers loading a 5MiB file
from SD card.

With cache:
=> blkc max 2 32
changed to max of 32 entries of 2 blocks each
=> load mmc 0:2 10008000 /usr/lib/libGAL.so
5042083 bytes read in 251 ms (19.2 MiB/s)

Without cache:
=> blkc max 0 0
changed to max of 0 entries of 0 blocks each
=> load mmc 0:2 10008000 /usr/lib/libGAL.so
5042083 bytes read in 4638 ms (1 MiB/s)

Eric Nelson (3):
drivers: block: add block device cache
mmc: force mmc command to go through block layer
sata: force sata reads and writes to go through block layer

cmd/mmc.c | 7 +-
cmd/sata.c | 6 +-
disk/part.c | 2 +
drivers/block/Kconfig | 20 ++++
drivers/block/Makefile | 1 +
drivers/block/blk-uclass.c | 13 +-
drivers/block/blkcache.c | 293 +++++++++++++++++++++++++++++++++++++++++++++
include/blk.h | 79 +++++++++++-
8 files changed, 414 insertions(+), 7 deletions(-)
create mode 100644 drivers/block/blkcache.c

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2.6.2