Hi Per.
2011/11/5 Per Forlin <per.lkml@xxxxxxxxx>:
> Hi Jaehoon,
>
> On Wed, Nov 2, 2011 at 11:28 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 you want to enable this feature, set MMC_CAP2_BKOPS.
>>
>> Signed-off-by: Jaehoon Chung <jh80.chung@xxxxxxxxxxx>
>> Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
>> CC: Hanumath Prasad <hanumath.prasad@xxxxxxxxxxxxxx>
>>
>> ---
>> Changelog V2:
>> - Use EXCEPTION_STATUS instead of URGENT_BKOPS
>> - Add function to check Exception_status(for eMMC4.5)
>> - remove unnecessary code.
>>
>> drivers/mmc/card/block.c | 9 +++++
>> drivers/mmc/card/queue.c | 4 ++
>> drivers/mmc/core/core.c | 87 ++++++++++++++++++++++++++++++++++++++++++++
>> drivers/mmc/core/mmc.c | 9 ++++-
>> drivers/mmc/core/mmc_ops.c | 4 ++
>> include/linux/mmc/card.h | 12 ++++++
>> include/linux/mmc/core.h | 3 ++
>> include/linux/mmc/host.h | 1 +
>> include/linux/mmc/mmc.h | 14 +++++++
>> 9 files changed, 142 insertions(+), 1 deletions(-)
>>
>> diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
>> index a1cb21f..fbfb405 100644
>> --- a/drivers/mmc/card/block.c
>> +++ b/drivers/mmc/card/block.c
>> @@ -1192,6 +1192,15 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
>> case MMC_BLK_SUCCESS:
>> case MMC_BLK_PARTIAL:
>> /*
>> + * Check BKOPS urgency from each R1 response
>> + */
>> + if (mmc_card_mmc(card) &&
>> + (brq->cmd.resp[0] & R1_EXCEPTION_EVENT)) {
>> + if (mmc_is_exception_event(card,
>> + EXT_CSD_URGENT_BKOPS))
>> + mmc_card_set_need_bkops(card);
>> + }
>> + /*
>> * A block was successfully transferred.
>> */
>> mmc_blk_reset_success(md, type);
>> diff --git a/drivers/mmc/card/queue.c b/drivers/mmc/card/queue.c
>> index dcad59c..20bb4a5 100644
>> --- a/drivers/mmc/card/queue.c
>> +++ b/drivers/mmc/card/queue.c
>> @@ -61,6 +61,9 @@ 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 {
>> @@ -68,6 +71,7 @@ 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 5278ffb..41ea923 100644
>> --- a/drivers/mmc/core/core.c
>> +++ b/drivers/mmc/core/core.c
>> @@ -238,6 +238,50 @@ 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;
>> +
>
>> + card->host->caps2 |= MMC_CAP2_BKOPS;
> I guess this should be set by the host driver?
You're right...it's my mistake...i will remove this..
>
>> + if ((!card || !card->ext_csd.bkops_en) &&
>> + !(card->host->caps2 & MMC_CAP2_BKOPS))
> I don't really understand this. If card is NULL it will seg-fault.
>
> Do you mean:
> if (!card)
> return
>
> if (!card->ext_csd.bkops_en ||
> !(card->host->caps2 & MMC_CAP2_BKOPS))
> return
>
> Do you really need to check card != NULL? Consider BUG_ON
Maybe if (!card && !card->ext_csd.bkops_en) is correctly...i think...
>
>> + return;
>> +
>> + /*
>> + * 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("error %d starting bkops\n", err);
>> + mmc_card_clr_need_bkops(card);
>> + goto out;
>> + }
>> + spin_lock_irqsave(&card->host->lock, flags);
>> + mmc_card_clr_need_bkops(card);
>> + 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);
>> @@ -466,6 +510,49 @@ 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_is_exception_event(struct mmc_card *card, unsigned int value)
>> +{
>> + int err;
>> + u8 ext_csd[512];
>> +
>> + /* In eMMC 4.41, R1_EXCEPTION_EVENT is URGENT_BKOPS */
>> + if (card->ext_csd.rev == 5)
>> + return 1;
>> +
>> + err = mmc_send_ext_csd(card, ext_csd);
>> + if (err)
>> + return err;
>> +
>> + return (ext_csd[EXT_CSD_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 3627044..af40fbb 100644
>> --- a/drivers/mmc/core/mmc.c
>> +++ b/drivers/mmc/core/mmc.c
>> @@ -448,6 +448,14 @@ 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 = 1;
> What if the card has not enabled bkops? This bit could be unset.
> card->ext_csd.bkops_en = ext_csd[EXT_CSD_BKOPS_EN];
When card is supported the bkops, bkops_en bit is set by default...
>
>> + card->ext_csd.raw_bkops_status =
>> + ext_csd[EXT_CSD_BKOPS_STATUS];
>> + }
>> +
>> /* check whether the eMMC card supports HPI */
>> if (ext_csd[EXT_CSD_HPI_FEATURES] & 0x1) {
>> card->ext_csd.hpi = 1;
>> @@ -498,7 +506,6 @@ static inline void mmc_free_ext_csd(u8 *ext_csd)
>> kfree(ext_csd);
>> }
>>
>> -
>> static int mmc_compare_ext_csds(struct mmc_card *card, unsigned bus_width)
>> {
>> u8 *bw_ext_csd;
>> diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c
>> index 007863e..7653e33 100644
>> --- a/drivers/mmc/core/mmc_ops.c
>> +++ b/drivers/mmc/core/mmc_ops.c
>> @@ -398,6 +398,10 @@ int mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
>> 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 415f2db..34740c5 100644
>> --- a/include/linux/mmc/card.h
>> +++ b/include/linux/mmc/card.h
>> @@ -71,6 +71,8 @@ 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 */
>> u8 raw_partition_support; /* 160 */
>> u8 raw_erased_mem_count; /* 181 */
>> u8 raw_ext_csd_structure; /* 194 */
>> @@ -84,6 +86,7 @@ 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;
>> @@ -206,6 +209,8 @@ struct mmc_card {
>> #define MMC_STATE_HIGHSPEED_DDR (1<<4) /* card is in high speed mode */
>> #define MMC_STATE_ULTRAHIGHSPEED (1<<5) /* card is in ultra high speed mode */
>> #define MMC_CARD_SDXC (1<<6) /* card is SDXC */
>> +#define MMC_STATE_NEED_BKOPS (1<<7) /* card need to do BKOPS */
>> +#define MMC_STATE_DOING_BKOPS (1<<8) /* card is doing 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 */
>> @@ -365,6 +370,8 @@ static inline void __maybe_unused remove_quirk(struct mmc_card *card, int data)
>> #define mmc_card_ddr_mode(c) ((c)->state & MMC_STATE_HIGHSPEED_DDR)
>> #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_need_bkops(c) ((c)->state & MMC_STATE_NEED_BKOPS)
>> +#define mmc_card_doing_bkops(c) ((c)->state & MMC_STATE_DOING_BKOPS)
>>
>> #define mmc_card_set_present(c) ((c)->state |= MMC_STATE_PRESENT)
>> #define mmc_card_set_readonly(c) ((c)->state |= MMC_STATE_READONLY)
>> @@ -373,6 +380,11 @@ static inline void __maybe_unused remove_quirk(struct mmc_card *card, int data)
>> #define mmc_card_set_ddr_mode(c) ((c)->state |= MMC_STATE_HIGHSPEED_DDR)
>> #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_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_clr_need_bkops(c) ((c)->state &= ~MMC_STATE_NEED_BKOPS)
>> +#define mmc_card_clr_doing_bkops(c) ((c)->state &= ~MMC_STATE_DOING_BKOPS)
>>
>> /*
>> * Quirk add/remove for MMC products.
>> diff --git a/include/linux/mmc/core.h b/include/linux/mmc/core.h
>> index 174a844..f6b997a 100644
>> --- a/include/linux/mmc/core.h
>> +++ b/include/linux/mmc/core.h
>> @@ -134,6 +134,8 @@ struct mmc_host;
>> struct mmc_card;
>> struct mmc_async_req;
>>
>> +extern int mmc_interrupt_bkops(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 +165,7 @@ 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 a3ac9c4..692e5f6 100644
>> --- a/include/linux/mmc/host.h
>> +++ b/include/linux/mmc/host.h
>> @@ -242,6 +242,7 @@ struct mmc_host {
>> #define MMC_CAP2_CACHE_CTRL (1 << 1) /* Allow cache control */
>> #define MMC_CAP2_POWEROFF_NOTIFY (1 << 2) /* Notify poweroff supported */
>> #define MMC_CAP2_NO_MULTI_READ (1 << 3) /* Multiblock reads don't work */
>> +#define MMC_CAP2_BKOPS (1 << 4) /* 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 0e71356..20b1420 100644
>> --- a/include/linux/mmc/mmc.h
>> +++ b/include/linux/mmc/mmc.h
>> @@ -138,6 +138,7 @@ 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
>> @@ -273,11 +274,14 @@ 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_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_ERASE_GROUP_DEF 175 /* R/W */
>> @@ -310,9 +314,11 @@ 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_BKOPS_SUPPORT 502 /* RO */
>> #define EXT_CSD_HPI_FEATURES 503 /* RO */
>>
>> /*
>> @@ -373,4 +379,12 @@ 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 */
>>
>> +/*
>> + * 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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>>
>
> Regards,
> Per
> --
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