mmc: support BKOPS feature for eMMC

Enable eMMC background operations (BKOPS) feature.

If URGENT_BKOPS is set after a response, note that BKOPS are required.
Immediately run BKOPS if required.  Read/write operations should be
requested during BKOPS(LEVEL-1), then issue HPI to interrupt the
ongoing BKOPS and service the foreground operation.
(This patch only controls the LEVEL2/3.)

When repeating the writing 1GB data, at a certain time, performance is
decreased.  At that time, card triggers 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 do we get BKOPS_STATUS value (periodically send ext_csd command)?
 * If using periodic bkops, also consider runtime_pm control.

Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Konstantin Dorfman <kdorfman@codeaurora.org>
Reviewed-by: Maya Erez <merez@codeaurora.org>
Signed-off-by: Chris Ball <cjb@laptop.org>

3 files changed, 189 insertions, 8 deletions

diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index af2c4d2fd69e..044cd016320e 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -26,6 +26,7 @@
 #include <linux/suspend.h>
 #include <linux/fault-inject.h>
 #include <linux/random.h>
+#include <linux/slab.h>
 
 #include <linux/mmc/card.h>
 #include <linux/mmc/host.h>
@@ -41,6 +42,12 @@
 #include "sd_ops.h"
 #include "sdio_ops.h"
 
+/*
+ * Background operations can take a long time, depending on the housekeeping
+ * 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 +252,70 @@ 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
+ *      @form_exception: A flag to indicate if this function was
+ *                       called due to an exception raised by the card
+ *
+ *      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, bool from_exception)
+{
+        int err;
+        int timeout;
+        bool use_busy_signal;
+
+        BUG_ON(!card);
+
+        if (!card->ext_csd.bkops_en || mmc_card_doing_bkops(card))
+                return;
+
+        err = mmc_read_bkops_status(card);
+        if (err) {
+                pr_err("%s: Failed to read bkops status: %d\n",
+                       mmc_hostname(card->host), err);
+                return;
+        }
+
+        if (!card->ext_csd.raw_bkops_status)
+                return;
+
+        if (card->ext_csd.raw_bkops_status < EXT_CSD_BKOPS_LEVEL_2 &&
+            from_exception)
+                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 = true;
+        } else {
+                timeout = 0;
+                use_busy_signal = false;
+        }
+
+        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);
+                goto out;
+        }
+
+        /*
+         * For urgent bkops status (LEVEL_2 and more)
+         * bkops executed synchronously, otherwise
+         * the operation is in progress
+         */
+        if (!use_busy_signal)
+                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 +425,14 @@ 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 for each R1 response
+                 */
+                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_EXCEPTION_EVENT))
+                        mmc_start_bkops(host->card, true);
         }
 
         if (!err && areq)
@@ -398,7 +477,7 @@ EXPORT_SYMBOL(mmc_wait_for_req);
  *      @card: the MMC card associated with the HPI transfer
  *
  *      Issued High Priority Interrupt, and check for card status
- *      util out-of prg-state.
+ *      until out-of prg-state.
  */
 int mmc_interrupt_hpi(struct mmc_card *card)
 {
@@ -490,6 +569,64 @@ 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, we can't issue an HPI.
+         * It should complete 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;
+
+        /*
+         * In future work, we should consider storing the entire ext_csd.
+         */
+        ext_csd = kmalloc(512, GFP_KERNEL);
+        if (!ext_csd) {
+                pr_err("%s: could not allocate buffer to receive the ext_csd.\n",
+                       mmc_hostname(card->host));
+                return -ENOMEM;
+        }
+
+        mmc_claim_host(card->host);
+        err = mmc_send_ext_csd(card, ext_csd);
+        mmc_release_host(card->host);
+        if (err)
+                goto out;
+
+        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];
+out:
+        kfree(ext_csd);
+        return err;
+}
+EXPORT_SYMBOL(mmc_read_bkops_status);
+
+/**
  *      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
@@ -2333,9 +2470,14 @@ 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) {
                         /*
@@ -2417,11 +2559,21 @@ int mmc_pm_notify(struct notifier_block *notify_block,
         struct mmc_host *host = container_of(
                 notify_block, struct mmc_host, pm_notify);
         unsigned long flags;
-
+        int err = 0;
 
         switch (mode) {
         case PM_HIBERNATION_PREPARE:
         case PM_SUSPEND_PREPARE:
+                if (host->card && mmc_card_mmc(host->card) &&
+                    mmc_card_doing_bkops(host->card)) {
+                        err = mmc_stop_bkops(host->card);
+                        if (err) {
+                                pr_err("%s: didn't stop bkops\n",
+                                        mmc_hostname(host));
+                                return err;
+                        }
+                        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 396b25891bb9..7509de14aa78 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 supports 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: BKOPS_EN bit is not set\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 225371a28861..a0e172042e65 100644
--- a/drivers/mmc/core/mmc_ops.c
+++ b/drivers/mmc/core/mmc_ops.c
@@ -393,18 +393,19 @@ 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
+ *      @use_busy_signal: use the busy signal as response type
  *
  *      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, bool use_busy_signal)
 {
         int err;
         struct mmc_command cmd = {0};
@@ -418,13 +419,23 @@ 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 unblocking command */
+        if (!use_busy_signal)
+                return 0;
+
         /* Must check status to be sure of no errors */
         do {
                 err = mmc_send_status(card, &status);
@@ -449,6 +460,13 @@ 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, true);
+}
 EXPORT_SYMBOL_GPL(mmc_switch);
 
 int mmc_send_status(struct mmc_card *card, u32 *status)