Hi Chris.
how about this feature..? didn't you have any comment?
Regards,
Jaehoon Chung
Jaehoon Chung wrote:
> Hi mailing.
>
> This RFC patch is supported background operation(BKOPS).
> And if you want to test this patch, must apply "[PATCH v3] mmc: support HPI
> send command"
>
> This patch is based on Hanumath Prasad's patch "mmc: enable background
> operations for emmc4.41 with HPI support"
> Hanumath's patch is implemented before applied per forlin's patch "use
> nonblock mmc request...".
> This patch is based on 3.1.0-rc1 in mmc-next.
>
> Background operations is run when set the URGENT_BKOPS in response.
>
> if set the URGENT_BKOPS in response, we can notify that card need the BKOPS.
> (URGENT_BKOPS is used in eMMC4.41 spec, but in eMMC4.5 changed to
> EXCEPTION_EVENT bit.
> maybe, we need to change this point).
>
> And all request is done, then run background operation.
> if request read/write operation when running BKOPS, issue HPI interrupt
>
> This patch is just RFC patch (not to merge).
>
>
> Signed-off-by: Jaehoon Chung <jh80.ch...@samsung.com>
> Signed-off-by: Kyungmin Park <kyungmin.p...@samsung.com>
> CC: Hanumath Prasad <hanumath.pra...@stericsson.com>
> ---
> v2:
> - change pr_debug/pr_info instead of printk()
> - add check BKOPS_EN bit (if BKOPS support)
> ---
> drivers/mmc/card/block.c | 4 ++++
> drivers/mmc/card/queue.c | 10 ++++++++++
> drivers/mmc/core/core.c | 38 ++++++++++++++++++++++++++++++++++++++
> drivers/mmc/core/mmc.c | 34 ++++++++++++++++++++++++++++++++++
> drivers/mmc/core/mmc_ops.c | 3 +++
> include/linux/mmc/card.h | 11 +++++++++++
> include/linux/mmc/core.h | 1 +
> include/linux/mmc/mmc.h | 4 ++++
> 8 files changed, 105 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
> index 1ff5486..83379ff 100644
> --- a/drivers/mmc/card/block.c
> +++ b/drivers/mmc/card/block.c
> @@ -1078,6 +1078,10 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq,
> struct request *rqc)
> switch (status) {
> case MMC_BLK_SUCCESS:
> case MMC_BLK_PARTIAL:
> + if (mmc_card_mmc(card) &&
> + (brq->cmd.resp[0] & R1_URGENT_BKOPS))
> + mmc_card_set_need_bkops(card);
> +
> /*
> * A block was successfully transferred.
> */
> diff --git a/drivers/mmc/card/queue.c b/drivers/mmc/card/queue.c
> index 45fb362..52b1293 100644
> --- a/drivers/mmc/card/queue.c
> +++ b/drivers/mmc/card/queue.c
> @@ -46,6 +46,8 @@ static int mmc_queue_thread(void *d)
> {
> struct mmc_queue *mq = d;
> struct request_queue *q = mq->queue;
> + struct mmc_card *card = mq->card;
> + unsigned long flags;
>
> current->flags |= PF_MEMALLOC;
>
> @@ -61,6 +63,13 @@ static int mmc_queue_thread(void *d)
> spin_unlock_irq(q->queue_lock);
>
> if (req || mq->mqrq_prev->req) {
> + if (mmc_card_doing_bkops(card)) {
> + mmc_interrupt_hpi(card);
> + spin_lock_irqsave(&card->host->lock, flags);
> + mmc_card_clr_doing_bkops(card);
> + spin_unlock_irqrestore(&card->host->lock,
> + flags);
> + }
> set_current_state(TASK_RUNNING);
> mq->issue_fn(mq, req);
> } else {
> @@ -68,6 +77,7 @@ 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 06fd77c..b5a92af 100644
> --- a/drivers/mmc/core/core.c
> +++ b/drivers/mmc/core/core.c
> @@ -360,6 +360,44 @@ void mmc_wait_for_req(struct mmc_host *host, struct
> mmc_request *mrq)
> EXPORT_SYMBOL(mmc_wait_for_req);
>
> /**
> + * mmc_start_bkops - start a background operation
> + * @card: the MMC card associated with the HPI transfer
> + *
> + * When need a background operation, card start a background operation.
> + */
> +void mmc_start_bkops(struct mmc_card *card)
> +{
> + int err;
> + unsigned long flags;
> +
> + BUG_ON(!card);
> +
> + if (!card->ext_csd.bkops_en) {
> + pr_info("Didn't set BKOPS enable bit!\n");
> + 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) {
> + 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);
> +
> +/**
> * mmc_interrupt_hpi - Issue for High priority Interrupt
> * @card: the MMC card associated with the HPI transfer
> *
> diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
> index ef312c9..4ae02d2 100644
> --- a/drivers/mmc/core/mmc.c
> +++ b/drivers/mmc/core/mmc.c
> @@ -420,6 +420,18 @@ static int mmc_read_ext_csd(struct mmc_card *card, u8
> *ext_csd)
> card->ext_csd.out_of_int_time =
> ext_csd[EXT_CSD_OUT_OF_INTERRUPT_TIME] * 10;
> }
> +
> + /*
> + * check whether the eMMC card support BKOPS.
> + * if set BKOPS_SUPPORT bit,
> + * BKOPS_STATUS, BKOPS_EN,,BKOPS_START and
> + * URGENT_BKOPS are supported.(default)
> + */
> + 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.rel_param = ext_csd[EXT_CSD_WR_REL_PARAM];
> }
>
> @@ -744,6 +756,28 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
> }
>
> /*
> + * Enable BKOPS feature (if supported)
> + */
> + if (card->ext_csd.bkops) {
> + /*
> + * If card supported BKOPS, default set BKOPS_EN bit.
> + * But ensure to enable bkops, need to check enable bit
> + */
> + if (!card->ext_csd.bkops_en) {
> + err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
> + EXT_CSD_BKOPS_EN, 1, 0);
> + if (err && err != -EBADMSG)
> + goto free_card;
> + if (err) {
> + printk(KERN_ERR "%s: Enabling BKOPS failed\n",
> + mmc_hostname(card->host));
> + err = 0;
> + } else
> + card->ext_csd.bkops_en = 1;
> + }
> + }
> +
> + /*
> * Enable HPI feature (if supported)
> */
> if (card->ext_csd.hpi) {
> diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c
> index 4706400..2a54221 100644
> --- a/drivers/mmc/core/mmc_ops.c
> +++ b/drivers/mmc/core/mmc_ops.c
> @@ -398,6 +398,9 @@ int mmc_switch(struct mmc_card *card, u8 set, u8 index,
> u8 value,
> if (err)
> return err;
>
> + 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 411054d..c41b91b 100644
> --- a/include/linux/mmc/card.h
> +++ b/include/linux/mmc/card.h
> @@ -67,6 +67,8 @@ struct mmc_ext_csd {
> bool hpi_en; /* HPI enablebit */
> bool hpi; /* HPI support bit */
> unsigned int hpi_cmd; /* cmd used as HPI */
> + bool bkops; /* BKOPS support bit */
> + bool bkops_en; /* BKOPS enable bit */
> u8 raw_partition_support; /* 160 */
> u8 raw_erased_mem_count; /* 181 */
> u8 raw_ext_csd_structure; /* 194 */
> @@ -181,6 +183,8 @@ 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) /* Need background operation */
> +#define MMC_STATE_DOING_BKOPS (1<<8) /* Do running
> background operation */
> 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 */
> @@ -318,6 +322,8 @@ 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)
> @@ -326,6 +332,11 @@ 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 dca3c08..90f2e1c 100644
> --- a/include/linux/mmc/core.h
> +++ b/include/linux/mmc/core.h
> @@ -162,6 +162,7 @@ extern int mmc_erase_group_aligned(struct mmc_card *card,
> unsigned int from,
> unsigned int nr);
> extern unsigned int mmc_calc_max_discard(struct mmc_card *card);
>
> +extern void mmc_start_bkops(struct mmc_card *card);
> extern int mmc_set_blocklen(struct mmc_card *card, unsigned int blocklen);
>
> extern void mmc_set_data_timeout(struct mmc_data *, const struct mmc_card *);
> diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h
> index e16c776..419a48e 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_READY_FOR_DATA (1 << 8) /* sx, a */
> #define R1_SWITCH_ERROR (1 << 7) /* sx, c */
> #define R1_APP_CMD (1 << 5) /* sr, c */
> +#define R1_URGENT_BKOPS (1 << 6) /* sr, a */
>
> #define R1_STATE_IDLE 0
> #define R1_STATE_READY 1
> @@ -273,6 +274,8 @@ struct _mmc_csd {
> #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_BKOPS_EN 163 /* R/W */
> +#define EXT_CSD_BKOPS_START 164 /* R/W */
> #define EXT_CSD_WR_REL_PARAM 166 /* RO */
> #define EXT_CSD_ERASE_GROUP_DEF 175 /* R/W */
> #define EXT_CSD_PART_CONFIG 179 /* R/W */
> @@ -295,6 +298,7 @@ struct _mmc_csd {
> #define EXT_CSD_SEC_ERASE_MULT 230 /* RO */
> #define EXT_CSD_SEC_FEATURE_SUPPORT 231 /* RO */
> #define EXT_CSD_TRIM_MULT 232 /* RO */
> +#define EXT_CSD_BKOPS_SUPPORT 502 /* RO */
> #define EXT_CSD_HPI_FEATURES 503 /* RO */
>
> /*
> --
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