On 09/17/2012 09:21 PM, Chris Ball wrote:
> Hi Jaehoon,
>
> On Mon, Sep 17 2012, Jaehoon Chung wrote:
>> Enable eMMC background operations (BKOPS) feature.
>>
>> If URGENT_BKOPS is set after a response, note that BKOPS
>> are required. Immediately run BKOPS if required.
>> read/write operations should be requested during BKOPS(LEVEL-1),
>> then issue HPI to interrupt the ongoing BKOPS
>> and service the foreground operation.
>> (This patch is only control the LEVEL2/3.)
>>
>> When repeating the writing 1GB data, at a certain time, performance is decreased.
>> At that time, card is also triggered the Level-3 or Level-2.
>> After running bkops, performance is recovered.
>>
>> Future considerations
>> * Check BKOPS_LEVEL=1 and start BKOPS in a preventive manner.
>> * Interrupt ongoing BKOPS before powering off the card.
>> * How get BKOPS_STATUS value.(periodically send ext_csd command?)
>> * If use periodic bkops, also consider runtime_pm control.
>>
>> Signed-off-by: Jaehoon Chung <jh80.chung@xxxxxxxxxxx>
>> Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
>> Signed-off-by: Konstantin Dorfman <kdorfman@xxxxxxxxxxxxxx>
>> Reviewed-by: Maya Erez <merez@xxxxxxxxxxxxxx>
>
> Thanks, looks good now. Is it okay if I apply this stylistic patch
> before pushing to mmc-next?
Sure, Thanks Chris.
Best Regards,
Jaehoon Chung
>
>
> diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
> index 4749557..044cd01 100644
> --- a/drivers/mmc/core/core.c
> +++ b/drivers/mmc/core/core.c
> @@ -43,8 +43,8 @@
> #include "sdio_ops.h"
>
> /*
> - * The Background operation can take a long time, depends on the house keeping
> - * operations the card has to peform
> + * Background operations can take a long time, depending on the housekeeping
> + * operations the card has to perform.
> */
> #define MMC_BKOPS_MAX_TIMEOUT (4 * 60 * 1000) /* max time to wait in ms */
>
> @@ -255,11 +255,11 @@ mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
> /**
> * mmc_start_bkops - start BKOPS for supported cards
> * @card: MMC card to start BKOPS
> - * @form_exception: A flags to indicate if this function was
> - * called due to an exception raised by the card
> + * @form_exception: A flag to indicate if this function was
> + * called due to an exception raised by the card
> *
> * Start background operations whenever requested.
> - * when the urgent BKOPS bit is set in a R1 command response
> + * When the urgent BKOPS bit is set in a R1 command response
> * then background operations should be started immediately.
> */
> void mmc_start_bkops(struct mmc_card *card, bool from_exception)
> @@ -275,7 +275,7 @@ void mmc_start_bkops(struct mmc_card *card, bool from_exception)
>
> err = mmc_read_bkops_status(card);
> if (err) {
> - pr_err("%s: Didn't read bkops status : %d\n",
> + pr_err("%s: Failed to read bkops status: %d\n",
> mmc_hostname(card->host), err);
> return;
> }
> @@ -283,8 +283,8 @@ void mmc_start_bkops(struct mmc_card *card, bool from_exception)
> if (!card->ext_csd.raw_bkops_status)
> return;
>
> - if (card->ext_csd.raw_bkops_status < EXT_CSD_BKOPS_LEVEL_2
> - && (from_exception))
> + if (card->ext_csd.raw_bkops_status < EXT_CSD_BKOPS_LEVEL_2 &&
> + from_exception)
> return;
>
> mmc_claim_host(card->host);
> @@ -299,8 +299,8 @@ void mmc_start_bkops(struct mmc_card *card, bool from_exception)
> err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
> EXT_CSD_BKOPS_START, 1, timeout, use_busy_signal);
> if (err) {
> - pr_warn("%s: error %d starting bkops\n",
> - mmc_hostname(card->host), err);
> + pr_warn("%s: Error %d starting bkops\n",
> + mmc_hostname(card->host), err);
> goto out;
> }
>
> @@ -429,9 +429,9 @@ struct mmc_async_req *mmc_start_req(struct mmc_host *host,
> * Check BKOPS urgency for each R1 response
> */
> if (host->card && mmc_card_mmc(host->card) &&
> - ((mmc_resp_type(host->areq->mrq->cmd) == MMC_RSP_R1) ||
> - (mmc_resp_type(host->areq->mrq->cmd) == MMC_RSP_R1B)) &&
> - (host->areq->mrq->cmd->resp[0] & R1_EXCEPTION_EVENT))
> + ((mmc_resp_type(host->areq->mrq->cmd) == MMC_RSP_R1) ||
> + (mmc_resp_type(host->areq->mrq->cmd) == MMC_RSP_R1B)) &&
> + (host->areq->mrq->cmd->resp[0] & R1_EXCEPTION_EVENT))
> mmc_start_bkops(host->card, true);
> }
>
> @@ -477,7 +477,7 @@ EXPORT_SYMBOL(mmc_wait_for_req);
> * @card: the MMC card associated with the HPI transfer
> *
> * Issued High Priority Interrupt, and check for card status
> - * util out-of prg-state.
> + * until out-of prg-state.
> */
> int mmc_interrupt_hpi(struct mmc_card *card)
> {
> @@ -572,8 +572,8 @@ EXPORT_SYMBOL(mmc_wait_for_cmd);
> * mmc_stop_bkops - stop ongoing BKOPS
> * @card: MMC card to check BKOPS
> *
> - * Send HPI command to stop ongoing background operations,
> - * to allow rapid servicing of foreground operations,e.g. read/
> + * Send HPI command to stop ongoing background operations to
> + * allow rapid servicing of foreground operations, e.g. read/
> * writes. Wait until the card comes out of the programming state
> * to avoid errors in servicing read/write requests.
> */
> @@ -585,8 +585,8 @@ int mmc_stop_bkops(struct mmc_card *card)
> err = mmc_interrupt_hpi(card);
>
> /*
> - * if err is EINVAL, it's status that can't issue HPI.
> - * it should complete the BKOPS.
> + * If err is EINVAL, we can't issue an HPI.
> + * It should complete the BKOPS.
> */
> if (!err || (err == -EINVAL)) {
> mmc_card_clr_doing_bkops(card);
> @@ -603,12 +603,12 @@ int mmc_read_bkops_status(struct mmc_card *card)
> u8 *ext_csd;
>
> /*
> - * In future work, we should be consider storing the entire ext_csd.
> + * In future work, we should consider storing the entire ext_csd.
> */
> ext_csd = kmalloc(512, GFP_KERNEL);
> if (!ext_csd) {
> - pr_err("%s: could not allocate a buffer to "
> - "receive the ext_csd.\n", mmc_hostname(card->host));
> + pr_err("%s: could not allocate buffer to receive the ext_csd.\n",
> + mmc_hostname(card->host));
> return -ENOMEM;
> }
>
> @@ -2470,15 +2470,14 @@ int mmc_suspend_host(struct mmc_host *host)
>
> mmc_bus_get(host);
> if (host->bus_ops && !host->bus_dead) {
> -
> if (host->bus_ops->suspend) {
> if (mmc_card_doing_bkops(host->card)) {
> err = mmc_stop_bkops(host->card);
> if (err)
> goto out;
> }
> - }
> err = host->bus_ops->suspend(host);
> + }
>
> if (err == -ENOSYS || !host->bus_ops->resume) {
> /*
> @@ -2566,10 +2565,10 @@ int mmc_pm_notify(struct notifier_block *notify_block,
> case PM_HIBERNATION_PREPARE:
> case PM_SUSPEND_PREPARE:
> if (host->card && mmc_card_mmc(host->card) &&
> - mmc_card_doing_bkops(host->card)) {
> + mmc_card_doing_bkops(host->card)) {
> err = mmc_stop_bkops(host->card);
> if (err) {
> - pr_err("%s didn't stop bkops\n",
> + pr_err("%s: didn't stop bkops\n",
> mmc_hostname(host));
> return err;
> }
> diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
> index 9c5caa6..7509de1 100644
> --- a/drivers/mmc/core/mmc.c
> +++ b/drivers/mmc/core/mmc.c
> @@ -463,15 +463,15 @@ static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd)
> }
>
> if (card->ext_csd.rev >= 5) {
> - /* check whether the eMMC card support BKOPS */
> + /* check whether the eMMC card supports BKOPS */
> if (ext_csd[EXT_CSD_BKOPS_SUPPORT] & 0x1) {
> card->ext_csd.bkops = 1;
> card->ext_csd.bkops_en = ext_csd[EXT_CSD_BKOPS_EN];
> card->ext_csd.raw_bkops_status =
> ext_csd[EXT_CSD_BKOPS_STATUS];
> if (!card->ext_csd.bkops_en)
> - pr_info("%s: Didn't set BKOPS_EN bit!\n",
> - mmc_hostname(card->host));
> + pr_info("%s: BKOPS_EN bit is not set\n",
> + mmc_hostname(card->host));
> }
>
> /* check whether the eMMC card supports HPI */
>
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