Re: [PATCH v6] mmc: support BKOPS feature for eMMC

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2012/1/19 Adrian Hunter <adrian.hunter@xxxxxxxxx>:
> On 19/01/12 13:33, Jaehoon Chung wrote:
>> Hi Adrian.
>>
>> On 01/19/2012 07:21 PM, Adrian Hunter wrote:
>>
>>> On 19/01/12 07:29, Jaehoon Chung 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.
>>>
>>> This still does not seem to address my earlier comment which was:
>>>
>>> The main problem with bkops is:
>>>
>>>      If the status is at level 3 ("critical"), some operations
>>>      may extend beyond their original timeouts due to maintenance
>>>      operations which cannot be delayed anymore.
>>>
>>> This means:
>>>
>>>      1. at level 3 either bkops are run or the timeout of the next
>>>      (data?) operation is extended
>>>
>>>      2. at level 3 either the bkops must not be interrupted or the
>>>      level must be rechecked after interruption and bkops run again
>>>      if the level is still 3, or the timeout of the next (data?)
>>>      operation is extended
>>>
>>
>> This patch didn't issue the HPI when bkops-status is level2-3
>> (URGENT_BKOPS case).
>> I didn't understand that must be recheck?? it's case of using HPI..?
>> If HPI didn't issue,though must be recheck bkops status?
>> And level-1 control should be considered for future-work.
>> I will also modify the patch comment..it's confused something.
>
> 1. Say there are 2 write requests queued and after the first write request
> the bkops level is 3.  That means the 2nd write request may timeout because
> the normal timeout rules do not apply.
>
> Thus:
>        1. at level 3 either bkops are run or the timeout of the next
>        (data?) operation is extended
>
> 2. Say you are running bkops because the level was 3 and a write request
> arrives.  You use HPI to interrupt the bkops, but the bkops level may still
> be 3, so the write request may timeout.  Hence:
>
>        2. at level 3 either the bkops must not be interrupted or the
>        level must be rechecked after interruption and bkops run again
>        if the level is still 3, or the timeout of the next (data?)
>        operation is extended
Right...may still be level-3..if use the HPI.

Hmm...
if my understanding is right, it's problem about next request when
running urgnet-bkops.
I will consider your comment...and more thinking for these problem.
Then i will resend the patch..:)

Thanks a lot..Adrian..

Best regards,
Jaehoon Chung
>
>>
>> Thanks,
>> Jaehoon Chung
>>
>>>>
>>>> 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>
>>>> ---
>>>> 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/block.c   |    7 +++
>>>>  drivers/mmc/card/queue.c   |    3 +
>>>>  drivers/mmc/core/core.c    |  116 ++++++++++++++++++++++++++++++++++++++++++++
>>>>  drivers/mmc/core/mmc.c     |   18 +++++++
>>>>  drivers/mmc/core/mmc_ops.c |   11 ++++-
>>>>  include/linux/mmc/card.h   |   20 ++++++++
>>>>  include/linux/mmc/core.h   |    4 ++
>>>>  include/linux/mmc/host.h   |    3 +
>>>>  include/linux/mmc/mmc.h    |   19 +++++++
>>>>  9 files changed, 200 insertions(+), 1 deletions(-)
>>>>
>>>> diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
>>>> index 176b78e..743b977 100644
>>>> --- a/drivers/mmc/card/block.c
>>>> +++ b/drivers/mmc/card/block.c
>>>> @@ -1284,6 +1284,13 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
>>>>             type = rq_data_dir(req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE;
>>>>             mmc_queue_bounce_post(mq_rq);
>>>>
>>>> +           /*
>>>> +            * Check BKOPS urgency from each R1 response
>>>> +            */
>>>> +           if (mmc_card_mmc(card) &&
>>>> +                   (brq->cmd.resp[0] & R1_EXCEPTION_EVENT))
>>>> +                           mmc_card_set_check_bkops(card);
>>>> +
>>>>             switch (status) {
>>>>             case MMC_BLK_SUCCESS:
>>>>             case MMC_BLK_PARTIAL:
>>>> diff --git a/drivers/mmc/card/queue.c b/drivers/mmc/card/queue.c
>>>> index 2517547..fd11a31 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_interrupt_bkops(mq->card);
>>>>                     set_current_state(TASK_RUNNING);
>>>>                     mq->issue_fn(mq, req);
>>>>             } else {
>>>> @@ -73,6 +75,7 @@ static int mmc_queue_thread(void *d)
>>>>                             set_current_state(TASK_RUNNING);
>>>>                             break;
>>>>                     }
>>>> +                   mmc_start_bkops(mq->card);
>>>>                     up(&mq->thread_sem);
>>>>                     schedule();
>>>>                     down(&mq->thread_sem);
>>>> diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
>>>> index bec0bf2..9cfb356 100644
>>>> --- a/drivers/mmc/core/core.c
>>>> +++ b/drivers/mmc/core/core.c
>>>> @@ -238,6 +238,59 @@ 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;
>>>> +   unsigned long flags;
>>>> +
>>>> +   BUG_ON(!card);
>>>> +   if (!card->ext_csd.bkops_en || !(card->host->caps2 & MMC_CAP2_BKOPS))
>>>> +           return;
>>>> +
>>>> +   if (mmc_card_check_bkops(card)) {
>>>> +           spin_lock_irqsave(&card->host->lock, flags);
>>>> +           mmc_card_clr_check_bkops(card);
>>>> +           spin_unlock_irqrestore(&card->host->lock, flags);
>>>> +           if (mmc_is_exception_event(card, EXT_CSD_URGENT_BKOPS))
>>>> +                   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);
>>>> +   err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
>>>> +                   EXT_CSD_BKOPS_START, 1, 0);
>>>> +   if (err) {
>>>> +           pr_warning("%s: error %d starting bkops\n",
>>>> +                      mmc_hostname(card->host), err);
>>>> +           mmc_card_clr_need_bkops(card);
>>>> +           goto out;
>>>> +   }
>>>> +
>>>> +   spin_lock_irqsave(&card->host->lock, flags);
>>>> +   mmc_card_clr_need_bkops(card);
>>>> +   if (card->ext_csd.raw_bkops_status < EXT_CSD_BKOPS_LEVEL_2)
>>>> +           mmc_card_set_doing_bkops(card);
>>>> +   spin_unlock_irqrestore(&card->host->lock, flags);
>>>> +out:
>>>> +   mmc_release_host(card->host);
>>>> +}
>>>> +EXPORT_SYMBOL(mmc_start_bkops);
>>>> +
>>>>  static void mmc_wait_done(struct mmc_request *mrq)
>>>>  {
>>>>     complete(&mrq->completion);
>>>> @@ -472,6 +525,69 @@ int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries
>>>>  EXPORT_SYMBOL(mmc_wait_for_cmd);
>>>>
>>>>  /**
>>>> + * mmc_interrupt_bkops - interrupt ongoing BKOPS
>>>> + * @card: MMC card to check BKOPS
>>>> + *
>>>> + * Send HPI command to interrupt 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_interrupt_bkops(struct mmc_card *card)
>>>> +{
>>>> +   int err = 0;
>>>> +   unsigned long flags;
>>>> +
>>>> +   BUG_ON(!card);
>>>> +
>>>> +   err = mmc_interrupt_hpi(card);
>>>> +
>>>> +   spin_lock_irqsave(&card->host->lock, flags);
>>>> +   mmc_card_clr_doing_bkops(card);
>>>> +   spin_unlock_irqrestore(&card->host->lock, flags);
>>>> +
>>>> +   return err;
>>>> +}
>>>> +EXPORT_SYMBOL(mmc_interrupt_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
>>>> diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
>>>> index dc03291..7ca2315 100644
>>>> --- a/drivers/mmc/core/mmc.c
>>>> +++ b/drivers/mmc/core/mmc.c
>>>> @@ -480,6 +480,24 @@ 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_warning("%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 4d41fa9..109d0f0 100644
>>>> --- a/drivers/mmc/core/mmc_ops.c
>>>> +++ b/drivers/mmc/core/mmc_ops.c
>>>> @@ -392,13 +392,22 @@ 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 (index == EXT_CSD_BKOPS_START &&
>>>> +       card->ext_csd.raw_bkops_status < EXT_CSD_BKOPS_LEVEL_2)
>>>> +           cmd.flags |= MMC_RSP_SPI_R1 | MMC_RSP_R1;
>>>> +   else
>>>> +           cmd.flags |= MMC_RSP_SPI_R1B | MMC_RSP_R1B;
>>>>     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);
>>>> diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
>>>> index f9a0663..d87f58c 100644
>>>> --- a/include/linux/mmc/card.h
>>>> +++ b/include/linux/mmc/card.h
>>>> @@ -71,10 +71,13 @@ 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 */
>>>> @@ -88,6 +91,7 @@ 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;
>>>> @@ -219,6 +223,10 @@ struct mmc_card {
>>>>  #define MMC_CARD_SDXC              (1<<6)          /* card is SDXC */
>>>>  #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_NEED_BKOPS       (1<<9)          /* card need to do BKOPS */
>>>> +#define MMC_STATE_DOING_BKOPS      (1<<10)         /* card is doing BKOPS */
>>>> +#define MMC_STATE_CHECK_BKOPS      (1<<11)         /* 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 */
>>>> @@ -384,6 +392,10 @@ static inline void __maybe_unused remove_quirk(struct mmc_card *card, int data)
>>>>  #define mmc_sd_card_uhs(c) ((c)->state & MMC_STATE_ULTRAHIGHSPEED)
>>>>  #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_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)
>>>> @@ -395,6 +407,14 @@ static inline void __maybe_unused remove_quirk(struct mmc_card *card, int data)
>>>>  #define mmc_sd_card_set_uhs(c) ((c)->state |= MMC_STATE_ULTRAHIGHSPEED)
>>>>  #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_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)
>>>> +
>>>>
>>>>  /*
>>>>   * Quirk add/remove for MMC products.
>>>> diff --git a/include/linux/mmc/core.h b/include/linux/mmc/core.h
>>>> index 87a976c..45357c7 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_interrupt_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 *);
>>>> @@ -163,6 +166,7 @@ extern int mmc_can_sanitize(struct mmc_card *card);
>>>>  extern int mmc_can_secure_erase_trim(struct mmc_card *card);
>>>>  extern int mmc_erase_group_aligned(struct mmc_card *card, unsigned int from,
>>>>                                unsigned int nr);
>>>> +extern void mmc_start_bkops(struct mmc_card *card);
>>>>  extern unsigned int mmc_calc_max_discard(struct mmc_card *card);
>>>>
>>>>  extern int mmc_set_blocklen(struct mmc_card *card, unsigned int blocklen);
>>>> diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
>>>> index dd13e05..8432e6a 100644
>>>> --- a/include/linux/mmc/host.h
>>>> +++ b/include/linux/mmc/host.h
>>>> @@ -257,6 +257,9 @@ struct mmc_host {
>>>>  #define MMC_CAP2_HS200_1_2V_SDR    (1 << 6)        /* can support */
>>>>  #define MMC_CAP2_HS200             (MMC_CAP2_HS200_1_8V_SDR | \
>>>>                              MMC_CAP2_HS200_1_2V_SDR)
>>>> +#define MMC_CAP2_BKOPS             (1 << 7)        /* BKOPS supported */
>>>> +#define MMC_CAP2_INIT_BKOPS        (1 << 8)        /* Need to set BKOPS_EN */
>>>> +
>>>>
>>>>     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 b822a2c..9760c70 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 */
>>>>
>>>>  /*
>>>> @@ -446,4 +452,17 @@ 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 */
>>>> --
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