mmc request handle

mmc_blk_issue_rq

mmc_start_request

wake up mmcqd

condition A

YES

MSDC host controller

mmc_start_req

Generic Block Layer

mmc_blk_issue_dscard

host-ops-request

Start transfer data

mmc_blk_issue_flush

1. Condition A: There is no request in transfer. It has request in process2. Condition B: There is no request in transfer and no request in process3. Condition C: get a request from the queue or this is a request in transfer.4. Condition D: There is an request in transfer4. Condition E: Have new request

NO

No

Finish transfer

Wakup

Handle result

REQ_DISCARD？

condition D？

condition E？

return

INT

mrq-donemmc_wait_data_done

Stop DMA

msdc_irq

Wakeup

mmc_request_fn

__mmc_start_data_req

Get request fromqueue

yes

Sleep

condition B

start DMA

REQ_FLUSH？

end

mmc_blk_issue_rw_rq

mmc_queue_thread

Wake up mmcqd

blk_end_request

BIO reuqest

Request OK？

mmc_pre_req

condition C

mrq-done = mmc_wait_data_done

mmc_blk_part_switch(Switch eMMC region)