On Wed, June 13, 2012 6:53 am, S, Venkatraman wrote:
> On Fri, Jun 8, 2012 at 10:09 AM, Jaehoon Chung <jh80.chung@xxxxxxxxxxx>
> wrote:
>> Enable eMMC background operations (BKOPS) feature.
>>
>> If URGENT_BKOPS is set after a response, note that BKOPS
>> are required. After all I/O requests are finished, run
>> BKOPS if required. Should read/write operations be requested
>> during BKOPS, first issue HPI to interrupt the ongoing BKOPS
>> and then service the request.
>> If BKOPS-STATUS is upper than LEVEL2, need to check until clear
>> the BKOPS-STATUS vaule.
>>
>> If you want to enable this feature, set MMC_CAP2_BKOPS.
>> And if you want to set the BKOPS_EN bit in ext_csd register,
>> use the MMC_CAP2_INIT_BKOPS.
>>
>> 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?)
>>
>> Signed-off-by: Jaehoon Chung <jh80.chung@xxxxxxxxxxx>
>> Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
>> Signed-off-by: Konstantin Dorfman <kdorfman@xxxxxxxxxxxxxx>
>> Signed-off-by: Maya Erez <merez@xxxxxxxxxxxxxx>
>> ---
>> Changelog V9:
>> - Rebased on patch-v7.
>> - Added Konstantin and Maya's patch
>> : mmc:core: Define synchronous BKOPS timeout
>> : mmc:core: eMMC4.5 BKOPS fixes
>> - Removed periodic bkops
>> : This feature will do in future work
>> - Add __mmc_switch() for waiting_for_prod_done.
>>
> Jaehoon,
> (I've been trying to sync up with you offline - but our timings dont
> seem to match.)
> In essence, you've fixed most of the issue, except for the need for
> periodic BKOPS. In my view, BKOPS should have little or no overhead
> during read writes. Here is the simple workflow that I think of (and
> was discussed with some experts during Linaro connect in HK)
>
> 1) Check the status of BKOPS need when the queue has been idle for,
> say, ~5 seconds
> 2) If it's >0, start BKOPS
> 3) If a request arrives during the above execution of BKOPS, issue HPI
> and continue with the request
> 4) Else let it run indefinitely
>
> There should be no need or procedure to check BKOPS during transactions.
> If this is done, in normal circumstances, the card wouldn't need to
> set URGENT_BKOPS. Even if it is set, the above sequence would handle
> it gracefully.
We have seen write latency improvement of 6ms per block with this BKOPs
patch. In all our tests, the card didn't report of a need for a BKOPs
operation, so it is not clear if periodic BKOPs will make a real
difference.
Therefore, we think that this patch can be approved as is and periodic
BKOPs can be released as a second phase.
> Apart from this, I have just one clarification required on the
> implementation.
> See below..
>
>> Changelog V8:
>> - Remove host->lock spin lock reviewed by Adrian
>> - Support periodic start bkops
>> - when bkops_status is level-3, if timeout is set to 0, send hpi.
>> - Move the start-bkops point
>> Changelog V7:
>> - Use HPI command when issued URGENT_BKOPS
>> - Recheck until clearing the bkops-status bit.
>> Changelog V6:
>> - Add the flag of check-bkops-status.
>> (For fixing async_req problem)
>> - Add the capability for MMC_CAP2_INIT_BKOPS.
>> (When unset the bkops_en bit in ext_csd register)
>> - modify the wrong condition.
>> Changelog V5:
>> - Rebase based on the latest mmc-next.
>> - modify codes based-on Chris's comment
>> Changelog V4:
>> - Add mmc_read_bkops_status
>> - When URGENT_BKOPS(level2-3), didn't use HPI command.
>> - In mmc_switch(), use R1B/R1 according to level.
>> Changelog V3:
>> - move the bkops setting's location in mmc_blk_issue_rw_rq
>> - modify condition checking
>> - bkops_en is assigned ext_csd[EXT_CSD_BKOPS_EN] instead of "1"
>> - remove the unused code
>> - change pr_debug instead of pr_warn in mmc_send_hpi_cmd
>> - Add the Future consideration suggested by Per
>> Changelog V2:
>> - Use EXCEPTION_STATUS instead of URGENT_BKOPS
>> - Add function to check Exception_status(for eMMC4.5)
>> ---
>> drivers/mmc/card/queue.c | 2 +
>> drivers/mmc/core/core.c | 161
>> +++++++++++++++++++++++++++++++++++++++++++-
>> drivers/mmc/core/mmc.c | 18 +++++
>> drivers/mmc/core/mmc_ops.c | 27 ++++++-
>> include/linux/mmc/card.h | 16 +++++
>> include/linux/mmc/core.h | 5 ++
>> include/linux/mmc/host.h | 2 +
>> include/linux/mmc/mmc.h | 19 +++++
>> 8 files changed, 243 insertions(+), 7 deletions(-)
>>
>> diff --git a/drivers/mmc/card/queue.c b/drivers/mmc/card/queue.c
>> index e360a97..e4a2cde 100644
>> --- a/drivers/mmc/card/queue.c
>> +++ b/drivers/mmc/card/queue.c
>> @@ -66,6 +66,8 @@ static int mmc_queue_thread(void *d)
>> spin_unlock_irq(q->queue_lock);
>>
>> if (req || mq->mqrq_prev->req) {
>> + if (mmc_card_doing_bkops(mq->card))
>> + mmc_stop_bkops(mq->card);
>> set_current_state(TASK_RUNNING);
>> mq->issue_fn(mq, req);
>> } else {
>> diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
>> index 0b6141d..9adb004 100644
>> --- a/drivers/mmc/core/core.c
>> +++ b/drivers/mmc/core/core.c
>> @@ -41,6 +41,12 @@
>> #include "sd_ops.h"
>> #include "sdio_ops.h"
>>
>> +/*
>> + * The Background operation can take a long time, depends on the house
>> keeping
>> + * operations the card has to peform
>> + */
>> +#define MMC_BKOPS_MAX_TIMEOUT (4 * 80 * 1000) /* max time to wait in
>> ms */
>> +
>> static struct workqueue_struct *workqueue;
>> static const unsigned freqs[] = { 400000, 300000, 200000, 100000 };
>>
>> @@ -175,6 +181,16 @@ void mmc_request_done(struct mmc_host *host, struct
>> mmc_request *mrq)
>> if (mrq->done)
>> mrq->done(mrq);
>>
>> + /*
>> + * Check BKOPS urgency from each R1 response
>> + */
>> + if (host->card && mmc_card_mmc(host->card) &&
>> + ((mmc_resp_type(cmd) == MMC_RSP_R1) ||
>> + (mmc_resp_type(cmd) == MMC_RSP_R1B)) &&
>> + (cmd->resp[0] & R1_EXCEPTION_EVENT)) {
>> + mmc_card_set_check_bkops(host->card);
>> + }
>> +
>> mmc_host_clk_release(host);
>> }
>> }
>> @@ -245,6 +261,74 @@ mmc_start_request(struct mmc_host *host, struct
>> mmc_request *mrq)
>> host->ops->request(host, mrq);
>> }
>>
>> +/**
>> + * mmc_start_bkops - start BKOPS for supported cards
>> + * @card: MMC card to start BKOPS
>> + *
>> + * Start background operations whenever requested.
>> + * 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)
>> +{
>> + int err;
>> + int timeout;
>> + u8 wait_for_prog_done;
>> +
>> + BUG_ON(!card);
>> + if (!card->ext_csd.bkops_en || !(card->host->caps2 &
>> MMC_CAP2_BKOPS))
>> + return;
>> +
>> + if (mmc_card_check_bkops(card)) {
>> + mmc_card_clr_check_bkops(card);
>> + if (mmc_is_exception_event(card, EXT_CSD_URGENT_BKOPS))
>> + if (card->ext_csd.raw_bkops_status)
>> + mmc_card_set_need_bkops(card);
>> + }
>> +
>> + /*
>> + * If card is already doing bkops or need for
>> + * bkops flag is not set, then do nothing just
>> + * return
>> + */
>> + if (mmc_card_doing_bkops(card) || !mmc_card_need_bkops(card))
>> + return;
>> +
>> + mmc_claim_host(card->host);
>> + if (card->ext_csd.raw_bkops_status >= EXT_CSD_BKOPS_LEVEL_2) {
>> + timeout = MMC_BKOPS_MAX_TIMEOUT;
>
> I don't think the timeout should be any different for BKOPS_START.
> IIUC, the CMD to set BKOPS_START would return immediately, and BKOPS
> will continue in the background. So the time to actually do the device
> management is not applicable to the CMD execution time..
In case of urgent BKOPs the BKOPs operation is synchronous. Therefore we
need to set the timeout to a bigger value, waiting for the BKOPs operation
to complete.
>
>> + wait_for_prog_done = 1;
>> + } else {
>> + timeout = 0;
>> + wait_for_prog_done = 0;
>> + }
>> +
>> + err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
>> + EXT_CSD_BKOPS_START, 1, timeout,
>> wait_for_prog_done);
>> + if (err) {
>> + pr_warn("%s: error %d starting bkops\n",
>> + mmc_hostname(card->host), err);
>> + mmc_card_clr_need_bkops(card);
>> + goto out;
>> + }
>> +
>> + mmc_card_clr_need_bkops(card);
>> +
>> + /*
>> + * For urgent bkops status (LEVEL_2 and more)
>> + * bkops executed synchronously, otherwise
>> + * the operation is in progress
>> + */
>> + if (card->ext_csd.raw_bkops_status >= EXT_CSD_BKOPS_LEVEL_2)
>> + mmc_card_set_check_bkops(card);
>> + else
>> + mmc_card_set_doing_bkops(card);
>> +
>> +out:
>> + mmc_release_host(card->host);
>> +}
>> +EXPORT_SYMBOL(mmc_start_bkops);
>> +
>> static void mmc_wait_done(struct mmc_request *mrq)
>> {
>> complete(&mrq->completion);
>> @@ -359,12 +443,15 @@ struct mmc_async_req *mmc_start_req(struct
>> mmc_host *host,
>> if (!err && areq)
>> start_err = __mmc_start_req(host, areq->mrq);
>>
>> - if (host->areq)
>> + if (host->areq) {
>> + if (!areq && host->areq && mmc_card_mmc(host->card))
>> + mmc_start_bkops(host->card);
>> mmc_post_req(host, host->areq->mrq, 0);
>> + }
>>
>> /* Cancel a prepared request if it was not started. */
>> if ((err || start_err) && areq)
>> - mmc_post_req(host, areq->mrq, -EINVAL);
>> + mmc_post_req(host, areq->mrq, -EINVAL);
>>
>> if (err)
>> host->areq = NULL;
>> @@ -480,6 +567,66 @@ int mmc_wait_for_cmd(struct mmc_host *host, struct
>> mmc_command *cmd, int retries
>> 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/
>> + * writes. Wait until the card comes out of the programming state
>> + * to avoid errors in servicing read/write requests.
>> + */
>> +int mmc_stop_bkops(struct mmc_card *card)
>> +{
>> + int err = 0;
>> +
>> + BUG_ON(!card);
>> +
>> + err = mmc_interrupt_hpi(card);
>> +
>> + mmc_card_clr_doing_bkops(card);
>> +
>> + return err;
>> +}
>> +EXPORT_SYMBOL(mmc_stop_bkops);
>> +
>> +int mmc_read_bkops_status(struct mmc_card *card)
>> +{
>> + int err;
>> + u8 ext_csd[512];
>> +
>> + mmc_claim_host(card->host);
>> + err = mmc_send_ext_csd(card, ext_csd);
>> + mmc_release_host(card->host);
>> + if (err)
>> + return err;
>> +
>> + card->ext_csd.raw_bkops_status = ext_csd[EXT_CSD_BKOPS_STATUS];
>> + card->ext_csd.raw_exception_status =
>> ext_csd[EXT_CSD_EXCEPTION_STATUS];
>> +
>> + return 0;
>> +}
>> +EXPORT_SYMBOL(mmc_read_bkops_status);
>> +
>> +int mmc_is_exception_event(struct mmc_card *card, unsigned int value)
>> +{
>> + int err;
>> +
>> + err = mmc_read_bkops_status(card);
>> + if (err) {
>> + pr_err("%s: Didn't read bkops status : %d\n",
>> + mmc_hostname(card->host), err);
>> + return 0;
>> + }
>> +
>> + /* In eMMC 4.41, R1_EXCEPTION_EVENT is URGENT_BKOPS */
>> + if (card->ext_csd.rev == 5)
>> + return 1;
>> +
>> + return (card->ext_csd.raw_exception_status & value) ? 1 : 0;
>> +}
>> +EXPORT_SYMBOL(mmc_is_exception_event);
>> +
>> +/**
>> * mmc_set_data_timeout - set the timeout for a data command
>> * @data: data phase for command
>> * @card: the MMC card associated with the data transfer
>> @@ -2294,8 +2441,11 @@ 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 (host->bus_ops->suspend) {
>> + if (mmc_card_doing_bkops(host->card))
>> + mmc_stop_bkops(host->card);
>> err = host->bus_ops->suspend(host);
>> + }
>>
>> if (err == -ENOSYS || !host->bus_ops->resume) {
>> /*
>> @@ -2382,6 +2532,11 @@ int mmc_pm_notify(struct notifier_block
>> *notify_block,
>> switch (mode) {
>> case PM_HIBERNATION_PREPARE:
>> case PM_SUSPEND_PREPARE:
>> + if (host->card && mmc_card_mmc(host->card) &&
>> + mmc_card_doing_bkops(host->card)) {
>> + mmc_interrupt_hpi(host->card);
>> + mmc_card_clr_doing_bkops(host->card);
>> + }
>>
>> spin_lock_irqsave(&host->lock, flags);
>> host->rescan_disable = 1;
>> diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
>> index 258b203..9e036e5 100644
>> --- a/drivers/mmc/core/mmc.c
>> +++ b/drivers/mmc/core/mmc.c
>> @@ -463,6 +463,24 @@ 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 */
>> + 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 &&
>> + card->host->caps2 & MMC_CAP2_INIT_BKOPS)
>> {
>> + err = mmc_switch(card,
>> EXT_CSD_CMD_SET_NORMAL,
>> + EXT_CSD_BKOPS_EN, 1, 0);
>> + if (err)
>> + pr_warn("%s: Enabling BKOPS
>> failed\n",
>> +
>> mmc_hostname(card->host));
>> + else
>> + card->ext_csd.bkops_en = 1;
>> + }
>> + }
>> +
>> /* check whether the eMMC card supports HPI */
>> if (ext_csd[EXT_CSD_HPI_FEATURES] & 0x1) {
>> card->ext_csd.hpi = 1;
>> diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c
>> index 69370f4..f0bebd9 100644
>> --- a/drivers/mmc/core/mmc_ops.c
>> +++ b/drivers/mmc/core/mmc_ops.c
>> @@ -367,18 +367,20 @@ int mmc_spi_set_crc(struct mmc_host *host, int
>> use_crc)
>> }
>>
>> /**
>> - * mmc_switch - modify EXT_CSD register
>> + * __mmc_switch - modify EXT_CSD register
>> * @card: the MMC card associated with the data transfer
>> * @set: cmd set values
>> * @index: EXT_CSD register index
>> * @value: value to program into EXT_CSD register
>> * @timeout_ms: timeout (ms) for operation performed by register
>> write,
>> * timeout of zero implies maximum possible timeout
>> + * @wait_for_prod_done: is waiting for program done
>> *
>> * Modifies the EXT_CSD register for selected card.
>> */
>> -int mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
>> - unsigned int timeout_ms)
>> +int __mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
>> + unsigned int timeout_ms, u8 wait_for_prog_done)
>> +
>> {
>> int err;
>> struct mmc_command cmd = {0};
>> @@ -392,13 +394,23 @@ int mmc_switch(struct mmc_card *card, u8 set, u8
>> index, u8 value,
>> (index << 16) |
>> (value << 8) |
>> set;
>> - cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
>> +
>> + cmd.flags = MMC_CMD_AC;
>> + if (wait_for_prog_done)
>> + cmd.flags |= MMC_RSP_SPI_R1B | MMC_RSP_R1B;
>> + else
>> + cmd.flags |= MMC_RSP_R1 | MMC_RSP_R1;
>> +
>> cmd.cmd_timeout_ms = timeout_ms;
>>
>> err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
>> if (err)
>> return err;
>>
>> + /* No need to check card status in case of BKOPS switch*/
>> + if (index == EXT_CSD_BKOPS_START)
>> + return 0;
>> +
>> /* Must check status to be sure of no errors */
>> do {
>> err = mmc_send_status(card, &status);
>> @@ -423,6 +435,13 @@ int mmc_switch(struct mmc_card *card, u8 set, u8
>> index, u8 value,
>>
>> return 0;
>> }
>> +EXPORT_SYMBOL_GPL(__mmc_switch);
>> +
>> +int mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
>> + unsigned int timeout_ms)
>> +{
>> + return __mmc_switch(card, set, index, value, timeout_ms, 1);
>> +}
>> EXPORT_SYMBOL_GPL(mmc_switch);
>>
>> int mmc_send_status(struct mmc_card *card, u32 *status)
>> diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
>> index d76513b..50b3539 100644
>> --- a/include/linux/mmc/card.h
>> +++ b/include/linux/mmc/card.h
>> @@ -76,10 +76,13 @@ struct mmc_ext_csd {
>> bool hpi_en; /* HPI enablebit
>> */
>> bool hpi; /* HPI support
>> bit */
>> unsigned int hpi_cmd; /* cmd used as
>> HPI */
>> + bool bkops; /* background support
>> bit */
>> + bool bkops_en; /* background enable bit
>> */
>> unsigned int data_sector_size; /* 512 bytes or
>> 4KB */
>> unsigned int data_tag_unit_size; /* DATA TAG UNIT
>> size */
>> unsigned int boot_ro_lock; /* ro lock
>> support */
>> bool boot_ro_lockable;
>> + u8 raw_exception_status; /* 53 */
>> u8 raw_partition_support; /* 160 */
>> u8 raw_erased_mem_count; /* 181 */
>> u8 raw_ext_csd_structure; /* 194 */
>> @@ -93,6 +96,7 @@ struct mmc_ext_csd {
>> u8 raw_sec_erase_mult; /* 230 */
>> u8 raw_sec_feature_support;/* 231 */
>> u8 raw_trim_mult; /* 232 */
>> + u8 raw_bkops_status; /* 246 */
>> u8 raw_sectors[4]; /* 212 - 4 bytes
>> */
>>
>> unsigned int feature_support;
>> @@ -225,6 +229,9 @@ struct mmc_card {
>> #define MMC_CARD_REMOVED (1<<7) /* card has been removed
>> */
>> #define MMC_STATE_HIGHSPEED_200 (1<<8) /* card is in
>> HS200 mode */
>> #define MMC_STATE_SLEEP (1<<9) /* card is in
>> sleep state */
>> +#define MMC_STATE_NEED_BKOPS (1<<10) /* card need to do BKOPS
>> */
>> +#define MMC_STATE_DOING_BKOPS (1<<11) /* card is doing BKOPS
>> */
>> +#define MMC_STATE_CHECK_BKOPS (1<<12) /* card need to check
>> BKOPS */
>> unsigned int quirks; /* card quirks */
>> #define MMC_QUIRK_LENIENT_FN0 (1<<0) /* allow SDIO FN0 writes
>> outside of the VS CCCR range */
>> #define MMC_QUIRK_BLKSZ_FOR_BYTE_MODE (1<<1) /* use func->cur_blksize
>> */
>> @@ -391,6 +398,9 @@ static inline void __maybe_unused
>> remove_quirk(struct mmc_card *card, int data)
>> #define mmc_card_ext_capacity(c) ((c)->state & MMC_CARD_SDXC)
>> #define mmc_card_removed(c) ((c) && ((c)->state & MMC_CARD_REMOVED))
>> #define mmc_card_is_sleep(c) ((c)->state & MMC_STATE_SLEEP)
>> +#define mmc_card_need_bkops(c) ((c)->state & MMC_STATE_NEED_BKOPS)
>> +#define mmc_card_doing_bkops(c) ((c)->state &
>> MMC_STATE_DOING_BKOPS)
>> +#define mmc_card_check_bkops(c) ((c)->state & MMC_STATE_CHECK_BKOPS)
>>
>> #define mmc_card_set_present(c) ((c)->state |=
>> MMC_STATE_PRESENT)
>> #define mmc_card_set_readonly(c) ((c)->state |= MMC_STATE_READONLY)
>> @@ -403,7 +413,13 @@ static inline void __maybe_unused
>> remove_quirk(struct mmc_card *card, int data)
>> #define mmc_card_set_ext_capacity(c) ((c)->state |= MMC_CARD_SDXC)
>> #define mmc_card_set_removed(c) ((c)->state |= MMC_CARD_REMOVED)
>> #define mmc_card_set_sleep(c) ((c)->state |= MMC_STATE_SLEEP)
>> +#define mmc_card_set_need_bkops(c) ((c)->state |=
>> MMC_STATE_NEED_BKOPS)
>> +#define mmc_card_set_doing_bkops(c) ((c)->state |=
>> MMC_STATE_DOING_BKOPS)
>> +#define mmc_card_set_check_bkops(c) ((c)->state |=
>> MMC_STATE_CHECK_BKOPS)
>>
>> +#define mmc_card_clr_need_bkops(c) ((c)->state &=
>> ~MMC_STATE_NEED_BKOPS)
>> +#define mmc_card_clr_doing_bkops(c) ((c)->state &=
>> ~MMC_STATE_DOING_BKOPS)
>> +#define mmc_card_clr_check_bkops(c) ((c)->state &=
>> ~MMC_STATE_CHECK_BKOPS)
>> #define mmc_card_clr_sleep(c) ((c)->state &= ~MMC_STATE_SLEEP)
>> /*
>> * Quirk add/remove for MMC products.
>> diff --git a/include/linux/mmc/core.h b/include/linux/mmc/core.h
>> index 1b431c7..bda3d86 100644
>> --- a/include/linux/mmc/core.h
>> +++ b/include/linux/mmc/core.h
>> @@ -134,6 +134,9 @@ struct mmc_host;
>> struct mmc_card;
>> struct mmc_async_req;
>>
>> +extern int mmc_stop_bkops(struct mmc_card *);
>> +extern int mmc_read_bkops_status(struct mmc_card *);
>> +extern int mmc_is_exception_event(struct mmc_card *, unsigned int);
>> extern struct mmc_async_req *mmc_start_req(struct mmc_host *,
>> struct mmc_async_req *, int
>> *);
>> extern int mmc_interrupt_hpi(struct mmc_card *);
>> @@ -142,6 +145,8 @@ extern int mmc_wait_for_cmd(struct mmc_host *,
>> struct mmc_command *, int);
>> extern int mmc_app_cmd(struct mmc_host *, struct mmc_card *);
>> extern int mmc_wait_for_app_cmd(struct mmc_host *, struct mmc_card *,
>> struct mmc_command *, int);
>> +extern void mmc_start_bkops(struct mmc_card *card);
>> +extern int __mmc_switch(struct mmc_card *, u8, u8, u8, unsigned int,
>> u8);
>> extern int mmc_switch(struct mmc_card *, u8, u8, u8, unsigned int);
>>
>> #define MMC_ERASE_ARG 0x00000000
>> diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
>> index 0707d22..d23caf2 100644
>> --- a/include/linux/mmc/host.h
>> +++ b/include/linux/mmc/host.h
>> @@ -238,6 +238,8 @@ struct mmc_host {
>> #define MMC_CAP2_BROKEN_VOLTAGE (1 << 7) /* Use the
>> broken voltage */
>> #define MMC_CAP2_DETECT_ON_ERR (1 << 8) /* On I/O err check card
>> removal */
>> #define MMC_CAP2_HC_ERASE_SZ (1 << 9) /* High-capacity erase
>> size */
>> +#define MMC_CAP2_INIT_BKOPS (1 << 10) /* To enable BKOPS */
>> +#define MMC_CAP2_BKOPS (1 << 11) /* BKOPS supported */
>>
>> mmc_pm_flag_t pm_caps; /* supported pm features
>> */
>> unsigned int power_notify_type;
>> diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h
>> index d425cab..80cfbf1 100644
>> --- a/include/linux/mmc/mmc.h
>> +++ b/include/linux/mmc/mmc.h
>> @@ -139,6 +139,7 @@ static inline bool mmc_op_multi(u32 opcode)
>> #define R1_CURRENT_STATE(x) ((x & 0x00001E00) >> 9) /* sx, b (4
>> bits) */
>> #define R1_READY_FOR_DATA (1 << 8) /* sx, a */
>> #define R1_SWITCH_ERROR (1 << 7) /* sx, c */
>> +#define R1_EXCEPTION_EVENT (1 << 6) /* sx, a */
>> #define R1_APP_CMD (1 << 5) /* sr, c */
>>
>> #define R1_STATE_IDLE 0
>> @@ -274,12 +275,15 @@ struct _mmc_csd {
>> #define EXT_CSD_FLUSH_CACHE 32 /* W */
>> #define EXT_CSD_CACHE_CTRL 33 /* R/W */
>> #define EXT_CSD_POWER_OFF_NOTIFICATION 34 /* R/W */
>> +#define EXT_CSD_EXCEPTION_STATUS 54 /* RO */
>> #define EXT_CSD_DATA_SECTOR_SIZE 61 /* R */
>> #define EXT_CSD_GP_SIZE_MULT 143 /* R/W */
>> #define EXT_CSD_PARTITION_ATTRIBUTE 156 /* R/W */
>> #define EXT_CSD_PARTITION_SUPPORT 160 /* RO */
>> #define EXT_CSD_HPI_MGMT 161 /* R/W */
>> #define EXT_CSD_RST_N_FUNCTION 162 /* R/W */
>> +#define EXT_CSD_BKOPS_EN 163 /* R/W */
>> +#define EXT_CSD_BKOPS_START 164 /* W */
>> #define EXT_CSD_SANITIZE_START 165 /* W */
>> #define EXT_CSD_WR_REL_PARAM 166 /* RO */
>> #define EXT_CSD_BOOT_WP 173 /* R/W */
>> @@ -313,11 +317,13 @@ struct _mmc_csd {
>> #define EXT_CSD_PWR_CL_200_360 237 /* RO */
>> #define EXT_CSD_PWR_CL_DDR_52_195 238 /* RO */
>> #define EXT_CSD_PWR_CL_DDR_52_360 239 /* RO */
>> +#define EXT_CSD_BKOPS_STATUS 246 /* RO */
>> #define EXT_CSD_POWER_OFF_LONG_TIME 247 /* RO */
>> #define EXT_CSD_GENERIC_CMD6_TIME 248 /* RO */
>> #define EXT_CSD_CACHE_SIZE 249 /* RO, 4 bytes */
>> #define EXT_CSD_TAG_UNIT_SIZE 498 /* RO */
>> #define EXT_CSD_DATA_TAG_SUPPORT 499 /* RO */
>> +#define EXT_CSD_BKOPS_SUPPORT 502 /* RO */
>> #define EXT_CSD_HPI_FEATURES 503 /* RO */
>>
>> /*
>> @@ -386,4 +392,17 @@ struct _mmc_csd {
>> #define MMC_SWITCH_MODE_CLEAR_BITS 0x02 /* Clear bits which are
>> 1 in value */
>> #define MMC_SWITCH_MODE_WRITE_BYTE 0x03 /* Set target to value
>> */
>>
>> +/*
>> + * BKOPS status level
>> + */
>> +#define EXT_CSD_BKOPS_LEVEL_2 0x2
>> +
>> +/*
>> + * EXCEPTION_EVENT_STATUS field (eMMC4.5)
>> + */
>> +#define EXT_CSD_URGENT_BKOPS BIT(0)
>> +#define EXT_CSD_DYNCAP_NEEDED BIT(1)
>> +#define EXT_CSD_SYSPOOL_EXHAUSTED BIT(2)
>> +#define EXT_CSD_PACKED_FAILURE BIT(3)
>> +
>> #endif /* LINUX_MMC_MMC_H */
>> --
>> 1.7.4.1
>
Thanks,
Maya
--
Sent by consultant of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum
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