Re: execution order of packed command in eMMC

[Konstantin Dorfman <kdorfman@codeaurora.org>]

Hello,

On 05/06/2015 09:16 PM, Meng Wang wrote:
> sequence that they are listed in the packed command header. So when
> error happens, I can safely assert it is completed for the first
> PACKED_FAILURE_INDEX commands in one pack. Is my understanding
> correct?

Yes, mmc_blk_end_packed_req() will complete packed requests till 
idx_failure index.

 From mmc_blk_issue_rw_rq():

case MMC_BLK_PARTIAL:
			/*
			 * A block was successfully transferred.
			 */
			mmc_blk_reset_success(md, type);

			if (mmc_packed_cmd(mq_rq->cmd_type)) {
				ret = mmc_blk_end_packed_req(mq_rq);
				break;
			} else {
				ret = blk_end_request(req, 0,
						brq->data.bytes_xfered);
			}

Then, reminder will be re-issued with mmc_start_req():

...
		if (ret) {
			if (mmc_packed_cmd(mq_rq->cmd_type)) {
				if (!mq_rq->packed->retries)
					goto cmd_abort;
				mmc_blk_packed_hdr_wrq_prep(mq_rq, card, mq);
				mmc_start_req(card->host,
					      &mq_rq->mmc_active, NULL);


-- 
Qualcomm Israel, on behalf of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project