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.
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.ch...@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.p...@samsung.com>
---
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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