Some minor nits..
On Tue, Jul 17, 2012 at 8:14 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 BKOPS-STATUS is upper than LEVEL2, need to check until clear
> the BKOPS-STATUS vaule.
>
> If you want to enable this feature, set MMC_CAP2_BKOPS.
>
> I tested with dw-mmc and sdhci controller.
> When repeating the writing 1GB data, at a certain time, performance is decreased.
> At that time, card is also triggered the Level-3 or Level-2.
> After running bkops, performance is recovered.
>
> 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?)
> * If use periodic bkops, also consider runtime_pm control.
>
> Signed-off-by: Jaehoon Chung <jh80.chung@xxxxxxxxxxx>
> Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
> Signed-off-by: Konstantin Dorfman <kdorfman@xxxxxxxxxxxxxx>
> Signed-off-by: Maya Erez <merez@xxxxxxxxxxxxxx>
> ---
> Changelog v10:
> - Based on latest mmc-next
> - Only control the level-2/3.
> : If triggered upper than level2, immediately start bkops.
> - Revmoe the BKOPS_CAP2_INIT_BKOPS (move into mmc-util)
> - change use_busy_signal instead of waiting_for_prog_done for __mmc_switch
> Changelog V9:
> - Rebased on patch-v7.
> - Added Konstantin and Maya's patch
> : mmc:core: Define synchronous BKOPS timeout
> : mmc:core: eMMC4.5 BKOPS fixes
> - Removed periodic bkops
> : This feature will do in future work
> - Add __mmc_switch() for waiting_for_prod_done.
>
> Changelog V8:
> - Remove host->lock spin lock reviewed by Adrian
> - Support periodic start bkops
> - when bkops_status is level-3, if timeout is set to 0, send hpi.
> - Move the start-bkops point
> Changelog V7:
> - Use HPI command when issued URGENT_BKOPS
> - Recheck until clearing the bkops-status bit.
> 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/core/core.c | 161 +++++++++++++++++++++++++++++++++++++++++++-
> drivers/mmc/core/mmc.c | 11 +++
> drivers/mmc/core/mmc_ops.c | 27 ++++++-
> include/linux/mmc/card.h | 16 +++++
> include/linux/mmc/core.h | 5 ++
> include/linux/mmc/host.h | 2 +-
> include/linux/mmc/mmc.h | 19 +++++-
> 7 files changed, 233 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
> index 9503cab..52bdd33 100644
> --- a/drivers/mmc/core/core.c
> +++ b/drivers/mmc/core/core.c
> @@ -41,6 +41,12 @@
> #include "sd_ops.h"
> #include "sdio_ops.h"
>
> +/*
> + * The Background operation can take a long time, depends on the house keeping
> + * operations the card has to perform
> + */
> +#define MMC_BKOPS_MAX_TIMEOUT (4 * 60 * 1000) /* max time to wait in ms */
> +
> static struct workqueue_struct *workqueue;
> static const unsigned freqs[] = { 400000, 300000, 200000, 100000 };
>
> @@ -245,6 +251,68 @@ 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;
> + int timeout;
> + u8 use_busy_signal;
> +
> + BUG_ON(!card);
> + if (!card->ext_csd.bkops_en || !(card->host->caps2 & MMC_CAP2_BKOPS))
> + return;
> +
> + if (mmc_is_exception_event(card, EXT_CSD_URGENT_BKOPS))
> + if (card->ext_csd.raw_bkops_status)
> + 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
> + */
Redundant comments. It is obvious from the code.
> + if (mmc_card_doing_bkops(card) || !mmc_card_need_bkops(card))
This check can be split into two. The mmc_card_doing_bkops() part
should go above the _is_exception_event() check, and can save an extra
EXT_CSD read.
The second part can be folded as an else part of the
""
+ if (card->ext_csd.raw_bkops_status)
+ mmc_card_set_need_bkops(card);
""
above.. and return.
> + return;
> +
> + mmc_claim_host(card->host);
> + if (card->ext_csd.raw_bkops_status >= EXT_CSD_BKOPS_LEVEL_2) {
> + timeout = MMC_BKOPS_MAX_TIMEOUT;
> + use_busy_signal = 0;
> + } else {
> + timeout = 0;
> + use_busy_signal = 1;
> + }
> +
> + err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
> + EXT_CSD_BKOPS_START, 1, timeout, use_busy_signal);
> + if (err) {
> + pr_warn("%s: error %d starting bkops\n",
> + mmc_hostname(card->host), err);
> + mmc_card_clr_need_bkops(card);
> + goto out;
> + }
> +
> + mmc_card_clr_need_bkops(card);
> +
> + /*
> + * For urgent bkops status (LEVEL_2 and more)
> + * bkops executed synchronously, otherwise
> + * the operation is in progress
> + */
> + if (card->ext_csd.raw_bkops_status < EXT_CSD_BKOPS_LEVEL_2)
This line can be replaced with
if (use_busy_signal)
for consistency.
> + mmc_card_set_doing_bkops(card);
> +out:
> + mmc_release_host(card->host);
> +}
> +EXPORT_SYMBOL(mmc_start_bkops);
> +
> static void mmc_wait_done(struct mmc_request *mrq)
> {
> complete(&mrq->completion);
> @@ -354,6 +422,20 @@ struct mmc_async_req *mmc_start_req(struct mmc_host *host,
> if (host->areq) {
> mmc_wait_for_req_done(host, host->areq->mrq);
> err = host->areq->err_check(host->card, host->areq);
> + /*
> + * Check BKOPS urgency from each R1 response
s/from/for
> + */
> + if (host->card && mmc_card_mmc(host->card) &&
> + ((mmc_resp_type(host->areq->mrq->cmd) == MMC_RSP_R1) ||
> + (mmc_resp_type(host->areq->mrq->cmd) == MMC_RSP_R1B)) &&
> + (host->areq->mrq->cmd->resp[0] & R1_EXP_EVENT))
> + mmc_start_bkops(host->card);
> + /*
> + * If areq exsit,
Typo s/exsit/exist
> + * we stop the bkops for foreground operation
> + */
> + if (areq && mmc_card_doing_bkops(host->card))
> + err = mmc_stop_bkops(host->card);
> }
>
> if (!err && areq)
> @@ -488,6 +570,72 @@ int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries
>
> EXPORT_SYMBOL(mmc_wait_for_cmd);
>
> +/*
> + * mmc_stop_bkops - stop ongoing BKOPS
> + * @card: MMC card to check BKOPS
> + *
> + * Send HPI command to stop 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_stop_bkops(struct mmc_card *card)
> +{
> + int err = 0;
> +
> + BUG_ON(!card);
> + err = mmc_interrupt_hpi(card);
> +
> + /*
> + * if err is EINVAL, it's status that can't issue HPI.
> + * Maybe it should be completed the BKOPS.
> + */
> + if (!err || (err == -EINVAL)) {
> + mmc_card_clr_doing_bkops(card);
> + err = 0;
> + }
> +
> + return err;
> +}
> +EXPORT_SYMBOL(mmc_stop_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_EXP_EVENTS_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
> @@ -2328,8 +2476,14 @@ int mmc_suspend_host(struct mmc_host *host)
> mmc_bus_get(host);
> if (host->bus_ops && !host->bus_dead) {
>
> - if (host->bus_ops->suspend)
> + if (host->bus_ops->suspend) {
> + if (mmc_card_doing_bkops(host->card)) {
> + err = mmc_stop_bkops(host->card);
> + if (err)
> + goto out;
> + }
> err = host->bus_ops->suspend(host);
> + }
>
> if (err == -ENOSYS || !host->bus_ops->resume) {
> /*
> @@ -2416,6 +2570,11 @@ int mmc_pm_notify(struct notifier_block *notify_block,
> switch (mode) {
> case PM_HIBERNATION_PREPARE:
> case PM_SUSPEND_PREPARE:
> + if (host->card && mmc_card_mmc(host->card) &&
> + mmc_card_doing_bkops(host->card)) {
> + mmc_interrupt_hpi(host->card);
Better to use mmc_stop_bkops() instead of mmc_interrupt_hpi() ?
> + mmc_card_clr_doing_bkops(host->card);
> + }
>
> spin_lock_irqsave(&host->lock, flags);
> host->rescan_disable = 1;
> diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
> index 7150f02..6fbffb6 100644
> --- a/drivers/mmc/core/mmc.c
> +++ b/drivers/mmc/core/mmc.c
> @@ -463,6 +463,17 @@ 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)
> + pr_info("%s: Didn't set BKOPS_EN bit!\n",
> + mmc_hostname(card->host));
> + }
> +
> /* 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 4ad994a..baf90e0 100644
> --- a/drivers/mmc/core/mmc_ops.c
> +++ b/drivers/mmc/core/mmc_ops.c
> @@ -368,18 +368,19 @@ int mmc_spi_set_crc(struct mmc_host *host, int use_crc)
> }
>
> /**
> - * mmc_switch - modify EXT_CSD register
> + * __mmc_switch - modify EXT_CSD register
> * @card: the MMC card associated with the data transfer
> * @set: cmd set values
> * @index: EXT_CSD register index
> * @value: value to program into EXT_CSD register
> * @timeout_ms: timeout (ms) for operation performed by register write,
> * timeout of zero implies maximum possible timeout
> + * @wait_for_prod_done: is waiting for program done
> *
> * Modifies the EXT_CSD register for selected card.
> */
> -int mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
> - unsigned int timeout_ms)
> +int __mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
> + unsigned int timeout_ms, u8 use_busy_signal)
> {
> int err;
> struct mmc_command cmd = {0};
> @@ -393,13 +394,24 @@ 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 (use_busy_signal)
> + cmd.flags |= MMC_RSP_SPI_R1B | MMC_RSP_R1B;
> + else
> + cmd.flags |= MMC_RSP_SPI_R1 | MMC_RSP_R1;
> +
> 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 LEVEL2 switch*/
> + if ((index == EXT_CSD_BKOPS_START) &&
> + (card->ext_csd.raw_bkops_status < EXT_CSD_BKOPS_LEVEL_2))
Please don't mix policy into utility functions. May be replace with
use_busy_signal check instead.
> + return 0;
> +
> /* Must check status to be sure of no errors */
> do {
> err = mmc_send_status(card, &status);
> @@ -424,6 +436,13 @@ int mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
>
> return 0;
> }
> +EXPORT_SYMBOL_GPL(__mmc_switch);
> +
> +int mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
> + unsigned int timeout_ms)
> +{
> + return __mmc_switch(card, set, index, value, timeout_ms, 1);
> +}
> EXPORT_SYMBOL_GPL(mmc_switch);
>
> int mmc_send_status(struct mmc_card *card, u32 *status)
> diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
> index cdfbc3c..b9e11aa 100644
> --- a/include/linux/mmc/card.h
> +++ b/include/linux/mmc/card.h
> @@ -79,10 +79,13 @@ 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 */
> @@ -96,6 +99,7 @@ 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;
> @@ -229,6 +233,9 @@ struct mmc_card {
> #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_SLEEP (1<<9) /* card is in sleep state */
> +#define MMC_STATE_NEED_BKOPS (1<<10) /* card need to do BKOPS */
> +#define MMC_STATE_DOING_BKOPS (1<<11) /* card is doing BKOPS */
> +#define MMC_STATE_CHECK_BKOPS (1<<12) /* 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 */
> @@ -400,6 +407,9 @@ static inline void __maybe_unused remove_quirk(struct mmc_card *card, int data)
> #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_is_sleep(c) ((c)->state & MMC_STATE_SLEEP)
> +#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)
> @@ -412,7 +422,13 @@ static inline void __maybe_unused remove_quirk(struct mmc_card *card, int data)
> #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_sleep(c) ((c)->state |= MMC_STATE_SLEEP)
> +#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)
> #define mmc_card_clr_sleep(c) ((c)->state &= ~MMC_STATE_SLEEP)
> /*
> * Quirk add/remove for MMC products.
> diff --git a/include/linux/mmc/core.h b/include/linux/mmc/core.h
> index d787037..fa5641d 100644
> --- a/include/linux/mmc/core.h
> +++ b/include/linux/mmc/core.h
> @@ -137,6 +137,9 @@ struct mmc_host;
> struct mmc_card;
> struct mmc_async_req;
>
> +extern int mmc_stop_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 *);
> @@ -145,6 +148,8 @@ extern int mmc_wait_for_cmd(struct mmc_host *, struct mmc_command *, int);
> extern int mmc_app_cmd(struct mmc_host *, struct mmc_card *);
> extern int mmc_wait_for_app_cmd(struct mmc_host *, struct mmc_card *,
> struct mmc_command *, int);
> +extern void mmc_start_bkops(struct mmc_card *card);
> +extern int __mmc_switch(struct mmc_card *, u8, u8, u8, unsigned int, u8);
> extern int mmc_switch(struct mmc_card *, u8, u8, u8, unsigned int);
> extern int mmc_send_ext_csd(struct mmc_card *card, u8 *ext_csd);
>
> diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
> index 79d8921..35b7ce8 100644
> --- a/include/linux/mmc/host.h
> +++ b/include/linux/mmc/host.h
> @@ -273,7 +273,7 @@ struct mmc_host {
> #define MMC_CAP2_PACKED_WR (1 << 21) /* Allow packed write */
> #define MMC_CAP2_PACKED_CMD (MMC_CAP2_PACKED_RD | \
> MMC_CAP2_PACKED_WR) /* Allow packed commands */
> -
> +#define MMC_CAP2_BKOPS (1 << 22) /* BKOPS supported */
> mmc_pm_flag_t pm_caps; /* supported pm features */
> unsigned int power_notify_type;
> #define MMC_HOST_PW_NOTIFY_NONE 0
> diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h
> index 254901a..e7396b4 100644
> --- a/include/linux/mmc/mmc.h
> +++ b/include/linux/mmc/mmc.h
> @@ -285,6 +285,8 @@ struct _mmc_csd {
> #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 */
> @@ -318,6 +320,7 @@ 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 */
> @@ -325,6 +328,7 @@ struct _mmc_csd {
> #define EXT_CSD_DATA_TAG_SUPPORT 499 /* RO */
> #define EXT_CSD_MAX_PACKED_WRITES 500 /* RO */
> #define EXT_CSD_MAX_PACKED_READS 501 /* RO */
> +#define EXT_CSD_BKOPS_SUPPORT 502 /* RO */
> #define EXT_CSD_HPI_FEATURES 503 /* RO */
>
> /*
> @@ -387,12 +391,23 @@ struct _mmc_csd {
>
> #define EXT_CSD_PACKED_EVENT_EN (1 << 3)
>
> -#define EXT_CSD_PACKED_FAILURE (1 << 3)
> -
> #define EXT_CSD_PACKED_GENERIC_ERROR (1 << 0)
> #define EXT_CSD_PACKED_INDEXED_ERROR (1 << 1)
>
> /*
> + * 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)
> +
> +/*
> + * BKOPS status level
> + */
> +#define EXT_CSD_BKOPS_LEVEL_2 0x2
> +
> +/*
> * MMC_SWITCH access modes
> */
>
> --
> 1.7.4.1
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