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SubjectRe: [PATCH 2/3] mmc: Support FFU for eMMC v5.0
Hi,

On 11/11/2014 02:18 AM, Avi Shchislowski wrote:
> eMMC5.0 FFU is using some of pre-existing mmc_test.c functionality.
> In order to prevent code duplication, some code of mmc_test.c was moved to core.c and modified.
>
> Signed-off-by: Avi Shchislowski <avi.shchislowski@sandisk.com>
> Signed-off-by: Alex Lemberg <alex.lemberg@sandisk.com>
>
> diff --git a/drivers/mmc/card/mmc_test.c b/drivers/mmc/card/mmc_test.c
> index 0c0fc52..e6ee0a8 100644
> --- a/drivers/mmc/card/mmc_test.c
> +++ b/drivers/mmc/card/mmc_test.c
> @@ -13,6 +13,7 @@
> #include <linux/mmc/card.h>
> #include <linux/mmc/host.h>
> #include <linux/mmc/mmc.h>
> +#include <linux/mmc/core.h>
> #include <linux/slab.h>
>
> #include <linux/scatterlist.h>
> @@ -189,43 +190,8 @@ static void mmc_test_prepare_mrq(struct mmc_test_card *test,
> struct mmc_request *mrq, struct scatterlist *sg, unsigned sg_len,
> unsigned dev_addr, unsigned blocks, unsigned blksz, int write)
> {
> - BUG_ON(!mrq || !mrq->cmd || !mrq->data || !mrq->stop);
> -
> - if (blocks > 1) {
> - mrq->cmd->opcode = write ?
> - MMC_WRITE_MULTIPLE_BLOCK : MMC_READ_MULTIPLE_BLOCK;
> - } else {
> - mrq->cmd->opcode = write ?
> - MMC_WRITE_BLOCK : MMC_READ_SINGLE_BLOCK;
> - }
> -
> - mrq->cmd->arg = dev_addr;
> - if (!mmc_card_blockaddr(test->card))
> - mrq->cmd->arg <<= 9;
> -
> - mrq->cmd->flags = MMC_RSP_R1 | MMC_CMD_ADTC;
> -
> - if (blocks == 1)
> - mrq->stop = NULL;
> - else {
> - mrq->stop->opcode = MMC_STOP_TRANSMISSION;
> - mrq->stop->arg = 0;
> - mrq->stop->flags = MMC_RSP_R1B | MMC_CMD_AC;
> - }
> -
> - mrq->data->blksz = blksz;
> - mrq->data->blocks = blocks;
> - mrq->data->flags = write ? MMC_DATA_WRITE : MMC_DATA_READ;
> - mrq->data->sg = sg;
> - mrq->data->sg_len = sg_len;
> -
> - mmc_set_data_timeout(mrq->data, test->card);
> -}
> -
> -static int mmc_test_busy(struct mmc_command *cmd)
> -{
> - return !(cmd->resp[0] & R1_READY_FOR_DATA) ||
> - (R1_CURRENT_STATE(cmd->resp[0]) == R1_STATE_PRG);
> + mmc_prepare_mrq(test->card, mrq, sg, sg_len,
> + dev_addr, blocks, blksz, write);
> }
>
> /*
> @@ -233,30 +199,9 @@ static int mmc_test_busy(struct mmc_command *cmd)
> */
> static int mmc_test_wait_busy(struct mmc_test_card *test)
> {
> - int ret, busy;
> - struct mmc_command cmd = {0};
> -
> - busy = 0;
> - do {
> - memset(&cmd, 0, sizeof(struct mmc_command));
> -
> - cmd.opcode = MMC_SEND_STATUS;
> - cmd.arg = test->card->rca << 16;
> - cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
> -
> - ret = mmc_wait_for_cmd(test->card->host, &cmd, 0);
> - if (ret)
> - break;
> -
> - if (!busy && mmc_test_busy(&cmd)) {
> - busy = 1;
> - if (test->card->host->caps & MMC_CAP_WAIT_WHILE_BUSY)
> - pr_info("%s: Warning: Host did not "
> - "wait for busy state to end.\n",
> - mmc_hostname(test->card->host));
> - }
> - } while (mmc_test_busy(&cmd));
> + int ret;
>
> + ret = mmc_wait_busy(test->card);

return mmc_wait_busy(test->card);

And mmc_test_wait_busy is wrapper function?
Why do you use the wrapper function?

> return ret;
> }
>
> @@ -693,19 +638,9 @@ static int mmc_test_check_result(struct mmc_test_card *test,
> {
> int ret;
>
> - BUG_ON(!mrq || !mrq->cmd || !mrq->data);
> -
> ret = 0;
>
> - if (!ret && mrq->cmd->error)
> - ret = mrq->cmd->error;
> - if (!ret && mrq->data->error)
> - ret = mrq->data->error;
> - if (!ret && mrq->stop && mrq->stop->error)
> - ret = mrq->stop->error;
> - if (!ret && mrq->data->bytes_xfered !=
> - mrq->data->blocks * mrq->data->blksz)
> - ret = RESULT_FAIL;
> + ret = mmc_check_result(mrq);
>
> if (ret == -EINVAL)
> ret = RESULT_UNSUP_HOST;
> @@ -844,23 +779,13 @@ static int mmc_test_simple_transfer(struct mmc_test_card *test,
> struct scatterlist *sg, unsigned sg_len, unsigned dev_addr,
> unsigned blocks, unsigned blksz, int write)
> {
> - struct mmc_request mrq = {0};
> - struct mmc_command cmd = {0};
> - struct mmc_command stop = {0};
> - struct mmc_data data = {0};
> -
> - mrq.cmd = &cmd;
> - mrq.data = &data;
> - mrq.stop = &stop;
> + int ret;
>
> - mmc_test_prepare_mrq(test, &mrq, sg, sg_len, dev_addr,
> + ret = mmc_simple_transfer(test->card, sg, sg_len, dev_addr,
> blocks, blksz, write);
> -
> - mmc_wait_for_req(test->card->host, &mrq);
> -
> - mmc_test_wait_busy(test);
> -
> - return mmc_test_check_result(test, &mrq);
> + if (ret == -EINVAL)
> + ret = RESULT_UNSUP_HOST;
> + return ret;
> }
>
> /*
> diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
> index d03a080..132da0c 100644
> --- a/drivers/mmc/core/core.c
> +++ b/drivers/mmc/core/core.c
> @@ -2658,6 +2658,134 @@ int mmc_pm_notify(struct notifier_block *notify_block,
> return 0;
> }
> #endif
> +/*
> + * Fill in the mmc_request structure given a set of transfer parameters.
> + */
> +void mmc_prepare_mrq(struct mmc_card *card,
> + struct mmc_request *mrq, struct scatterlist *sg, unsigned sg_len,
> + unsigned dev_addr, unsigned blocks, unsigned blksz, int write)
> +{
> + BUG_ON(!mrq || !mrq->cmd || !mrq->data || !mrq->stop);
> +
> + if (blocks > 1) {
> + mrq->cmd->opcode = write ?
> + MMC_WRITE_MULTIPLE_BLOCK : MMC_READ_MULTIPLE_BLOCK;
> + } else {
> + mrq->cmd->opcode = write ?
> + MMC_WRITE_BLOCK : MMC_READ_SINGLE_BLOCK;
> + }
> +
> + mrq->cmd->arg = dev_addr;
> + if (!mmc_card_blockaddr(card))
> + mrq->cmd->arg <<= 9;
> +
> + mrq->cmd->flags = MMC_RSP_R1 | MMC_CMD_ADTC;
> +
> + if (blocks == 1)
> + mrq->stop = NULL;
> + else {
> + mrq->stop->opcode = MMC_STOP_TRANSMISSION;
> + mrq->stop->arg = 0;
> + mrq->stop->flags = MMC_RSP_R1B | MMC_CMD_AC;
> + }
> +
> + mrq->data->blksz = blksz;
> + mrq->data->blocks = blocks;
> + mrq->data->flags = write ? MMC_DATA_WRITE : MMC_DATA_READ;
> + mrq->data->sg = sg;
> + mrq->data->sg_len = sg_len;
> +
> + mmc_set_data_timeout(mrq->data, card);
> +}
> +EXPORT_SYMBOL(mmc_prepare_mrq);
> +
> +static int mmc_busy(struct mmc_command *cmd)
> +{
> + return !(cmd->resp[0] & R1_READY_FOR_DATA) ||
> + (R1_CURRENT_STATE(cmd->resp[0]) == R1_STATE_PRG);
> +}

What's function?

> +
> +/*
> + * Wait for the card to finish the busy state
> + */
> +int mmc_wait_busy(struct mmc_card *card)
> +{
> + int ret, busy = 0;
> + struct mmc_command cmd = {0};
> +
> + memset(&cmd, 0, sizeof(struct mmc_command));
> + cmd.opcode = MMC_SEND_STATUS;
> + cmd.arg = card->rca << 16;
> + cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
> +
> + do {
> + ret = mmc_wait_for_cmd(card->host, &cmd, 0);
> + if (ret)
> + break;
> +
> + if (!busy && mmc_busy(&cmd)) {
> + busy = 1;
> + if (card->host->caps & MMC_CAP_WAIT_WHILE_BUSY) {
> + pr_warn("%s: Warning: Host did not "
> + "wait for busy state to end.\n",
> + mmc_hostname(card->host));
> + }
> + }
> +
> + } while (mmc_busy(&cmd));
> +
> + return ret;
> +}
> +EXPORT_SYMBOL(mmc_wait_busy);
> +
> +int mmc_check_result(struct mmc_request *mrq)
> +{
> + int ret;
> +
> + BUG_ON(!mrq || !mrq->cmd || !mrq->data);
> +
> + ret = 0;

Why do you initialized at here?
if ret is 0, why do you check "if (!ret && xxxx)" at the below condition?

> +
> + if (!ret && mrq->cmd->error)
> + ret = mrq->cmd->error;
> + if (!ret && mrq->data->error)
> + ret = mrq->data->error;
> + if (!ret && mrq->stop && mrq->stop->error)
> + ret = mrq->stop->error;
> + if (!ret && mrq->data->bytes_xfered !=
> + mrq->data->blocks * mrq->data->blksz)
> + ret = -EPERM;
> +
> + return ret;
> +}
> +EXPORT_SYMBOL(mmc_check_result);
> +
> +/*
> ++ * transfer with certain parameters
> + */
> +int mmc_simple_transfer(struct mmc_card *card,
> + struct scatterlist *sg, unsigned sg_len, unsigned dev_addr,
> + unsigned blocks, unsigned blksz, int write)
> +{
> + struct mmc_request mrq = {0};
> + struct mmc_command cmd = {0};
> + struct mmc_command stop = {0};
> + struct mmc_data data = {0};
> +
> + mrq.cmd = &cmd;
> + mrq.data = &data;
> + mrq.stop = &stop;
> +
> + mmc_prepare_mrq(card, &mrq, sg, sg_len, dev_addr,
> + blocks, blksz, write);
> +
> + mmc_wait_for_req(card->host, &mrq);
> +
> + mmc_wait_busy(card);
> +
> + return mmc_check_result(&mrq);
> +}
> +EXPORT_SYMBOL(mmc_simple_transfer);
>
> /**
> * mmc_init_context_info() - init synchronization context
> diff --git a/include/linux/mmc/core.h b/include/linux/mmc/core.h
> index f206e29..92540d0 100644
> --- a/include/linux/mmc/core.h
> +++ b/include/linux/mmc/core.h
> @@ -196,6 +196,14 @@ extern void mmc_put_card(struct mmc_card *card);
> extern int mmc_flush_cache(struct mmc_card *);
>
> extern int mmc_detect_card_removed(struct mmc_host *host);
> +extern void mmc_prepare_mrq(struct mmc_card *card,
> + struct mmc_request *mrq, struct scatterlist *sg, unsigned sg_len,
> + unsigned dev_addr, unsigned blocks, unsigned blksz, int write);
> +extern int mmc_wait_busy(struct mmc_card *card);
> +extern int mmc_check_result(struct mmc_request *mrq);
> +extern int mmc_simple_transfer(struct mmc_card *card,
> + struct scatterlist *sg, unsigned sg_len, unsigned dev_addr,
> + unsigned blocks, unsigned blksz, int write);
>
> /**
> * mmc_claim_host - exclusively claim a host
>



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