How significant is the cache maintenance over head? It depends, the eMMC are much faster now compared to a few years ago and cache maintenance cost more due to multiple cache levels and speculative cache pre-fetch. In relation the cost for handling the caches have increased and is now a bottle neck dealing with fast eMMC together with DMA.
The intention for introducing non-blocking mmc requests is to minimize the time between a mmc request ends and another mmc request starts. In the current implementation the MMC controller is idle when dma_map_sg and dma_unmap_sg is processing. Introducing non-blocking mmc request makes it possible to prepare the caches for next job in parallel to an active mmc request.
This is done by making the issue_rw_rq() non-blocking. The increase in throughput is proportional to the time it takes to prepare (major part of preparations is dma_map_sg and dma_unmap_sg) a request and how fast the memory is. The faster the MMC/SD is the more significant the prepare request time becomes. Measurements on U5500 and Panda on eMMC and SD shows significant performance gain for large reads when running DMA mode. In the PIO case the performance is unchanged.
There are two optional hooks pre_req() and post_req() that the host driver may implement in order to move work to before and after the actual mmc_request function is called. In the DMA case pre_req() may do dma_map_sg() and prepare the dma descriptor and post_req runs the dma_unmap_sg.
Details on measurements from IOZone and mmc_test: https://wiki.linaro.org/WorkingGroups/Kernel/Specs/StoragePerfMMC-async-req
Changes since v7: * rebase on mmc-next, on top of Russell's updated error handling. * Clarify description of mmc_start_req() * Resolve compile without CONFIG_DMA_ENIGNE issue for mmci * Add mmc test to measure how performance is affected by sg length * Add missing wait_for_busy in mmc_test non-blocking test. This call got lost in v4 of this patchset when refactoring mmc_start_req. * Add sub-prefix (core block queue) to relevant patches.
Per Forlin (12): mmc: core: add non-blocking mmc request function omap_hsmmc: add support for pre_req and post_req mmci: implement pre_req() and post_req() mmc: mmc_test: add debugfs file to list all tests mmc: mmc_test: add test for non-blocking transfers mmc: mmc_test: test to measure how sg_len affect performance mmc: block: add member in mmc queue struct to hold request data mmc: block: add a block request prepare function mmc: block: move error code in issue_rw_rq to a separate function. mmc: queue: add a second mmc queue request member mmc: core: add random fault injection mmc: block: add handling for two parallel block requests in issue_rw_rq
drivers/mmc/card/block.c | 505 ++++++++++++++++++++++++----------------- drivers/mmc/card/mmc_test.c | 491 ++++++++++++++++++++++++++++++++++++++-- drivers/mmc/card/queue.c | 184 ++++++++++------ drivers/mmc/card/queue.h | 33 ++- drivers/mmc/core/core.c | 167 +++++++++++++- drivers/mmc/core/debugfs.c | 5 + drivers/mmc/host/mmci.c | 147 +++++++++++- drivers/mmc/host/mmci.h | 8 + drivers/mmc/host/omap_hsmmc.c | 87 +++++++- include/linux/mmc/core.h | 6 +- include/linux/mmc/host.h | 24 ++ lib/Kconfig.debug | 11 + 12 files changed, 1345 insertions(+), 323 deletions(-)