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 <[email protected]> Signed-off-by: Kyungmin Park <[email protected]> CC: Hanumath Prasad <[email protected]> --- 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 */ /* -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
