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Groups > linux.kernel > #1737465 > unrolled thread

[PATCH V9 00/15] mmc: Add Command Queue support

Started byAdrian Hunter <adrian.hunter@intel.com>
First post2017-09-22 14:50 +0200
Last post2017-09-27 00:30 +0200
Articles 17 — 4 participants

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Contents

  [PATCH V9 00/15] mmc: Add Command Queue support Adrian Hunter <adrian.hunter@intel.com> - 2017-09-22 14:50 +0200
    [PATCH V9 02/15] mmc: core: Introduce host claiming by context Adrian Hunter <adrian.hunter@intel.com> - 2017-09-22 14:50 +0200
    [PATCH V9 12/15] mmc: core: Export mmc_retune_hold_now() and mmc_retune_release() Adrian Hunter <adrian.hunter@intel.com> - 2017-09-22 14:50 +0200
      Re: [PATCH V9 12/15] mmc: core: Export mmc_retune_hold_now() and mmc_retune_release() Linus Walleij <linus.walleij@linaro.org> - 2017-09-27 01:50 +0200
      Re: [PATCH V9 12/15] mmc: core: Export mmc_retune_hold_now() and mmc_retune_release() Ulf Hansson <ulf.hansson@linaro.org> - 2017-10-02 10:40 +0200
    [PATCH V9 08/15] mmc: block: Factor out mmc_setup_queue() Adrian Hunter <adrian.hunter@intel.com> - 2017-09-22 14:50 +0200
      Re: [PATCH V9 08/15] mmc: block: Factor out mmc_setup_queue() Linus Walleij <linus.walleij@linaro.org> - 2017-09-26 17:40 +0200
    [PATCH V9 10/15] mmc: core: Export mmc_start_bkops() Adrian Hunter <adrian.hunter@intel.com> - 2017-09-22 14:50 +0200
      Re: [PATCH V9 10/15] mmc: core: Export mmc_start_bkops() Linus Walleij <linus.walleij@linaro.org> - 2017-09-27 01:50 +0200
    [PATCH V9 03/15] mmc: core: Add support for handling CQE requests Adrian Hunter <adrian.hunter@intel.com> - 2017-09-22 14:50 +0200
      Re: [PATCH V9 03/15] mmc: core: Add support for handling CQE requests Linus Walleij <linus.walleij@linaro.org> - 2017-09-26 17:40 +0200
    [PATCH V9 06/15] mmc: block: Use local variables in mmc_blk_data_prep() Adrian Hunter <adrian.hunter@intel.com> - 2017-09-22 14:50 +0200
      Re: [PATCH V9 06/15] mmc: block: Use local variables in mmc_blk_data_prep() Linus Walleij <linus.walleij@linaro.org> - 2017-09-26 17:40 +0200
    [PATCH V9 15/15] mmc: sdhci-pci: Add CQHCI support for Intel GLK Adrian Hunter <adrian.hunter@intel.com> - 2017-09-22 14:50 +0200
    RE: [PATCH V9 14/15] mmc: cqhci: support for command queue enabled  host Bough Chen <haibo.chen@nxp.com> - 2017-09-25 04:50 +0200
      Re: [PATCH V9 14/15] mmc: cqhci: support for command queue enabled  host Adrian Hunter <adrian.hunter@intel.com> - 2017-09-25 08:40 +0200
    Re: [PATCH V9 00/15] mmc: Add Command Queue support Ulf Hansson <ulf.hansson@linaro.org> - 2017-09-27 00:30 +0200

#1737465 — [PATCH V9 00/15] mmc: Add Command Queue support

FromAdrian Hunter <adrian.hunter@intel.com>
Date2017-09-22 14:50 +0200
Subject[PATCH V9 00/15] mmc: Add Command Queue support
Message-ID<usvz3-68T-3@gated-at.bofh.it>
Hi

Here is V9 of the hardware command queue patches without the software
command queue patches, now using blk-mq and now with blk-mq support for
non-CQE I/O.

HW CMDQ offers 25% - 50% better random multi-threaded I/O.  I see a slight
2% drop in sequential read speed but no change to sequential write.

Non-CQE blk-mq showed a 3% decrease in sequential read performance.  This
seemed to be coming from the inferior latency of running work items compared
with a dedicated thread.  Hacking blk-mq workqueue to be unbound reduced the
performance degradation from 3% to 1%.

While we should look at changing blk-mq to give better workqueue performance,
a bigger gain is likely to be made by adding a new host API to enable the
next already-prepared request to be issued directly from within ->done()
callback of the current request.


Changes since V8:
	Re-based
      mmc: core: Introduce host claiming by context
	Slightly simplified as per Ulf
      mmc: core: Export mmc_retune_hold_now() and mmc_retune_release()
	New patch.
      mmc: block: Add CQE and blk-mq support
	Fix missing ->post_req() on the error path

Changes since V7:
	Re-based
      mmc: core: Introduce host claiming by context
	Slightly simplified
      mmc: core: Add parameter use_blk_mq
	New patch.
      mmc: core: Remove unnecessary host claim
	New patch.
      mmc: core: Export mmc_start_bkops()
	New patch.
      mmc: core: Export mmc_start_request()
	New patch.
      mmc: block: Add CQE and blk-mq support
	Add blk-mq support for non_CQE requests

Changes since V6:
      mmc: core: Introduce host claiming by context
	New patch.
      mmc: core: Move mmc_start_areq() declaration
	Dropped because it has been applied
      mmc: block: Fix block status codes
	Dropped because it has been applied
      mmc: host: Add CQE interface
	Dropped because it has been applied
      mmc: core: Turn off CQE before sending commands
	Dropped because it has been applied
      mmc: block: Factor out mmc_setup_queue()
	New patch.
      mmc: block: Add CQE support
	Drop legacy support and add blk-mq support

Changes since V5:
	Re-based
      mmc: core: Add mmc_retune_hold_now()
	Dropped because it has been applied
      mmc: core: Add members to mmc_request and mmc_data for CQE's
	Dropped because it has been applied
      mmc: core: Move mmc_start_areq() declaration
	New patch at Ulf's request
      mmc: block: Fix block status codes
	Another un-related patch
      mmc: host: Add CQE interface
	Move recovery_notifier() callback to struct mmc_request
      mmc: core: Add support for handling CQE requests
	Roll __mmc_cqe_request_done() into mmc_cqe_request_done()
	Move function declarations requested by Ulf
      mmc: core: Remove unused MMC_CAP2_PACKED_CMD
	Dropped because it has been applied
      mmc: block: Add CQE support
	Add explanation to commit message
	Adjustment for changed recovery_notifier() callback
      mmc: cqhci: support for command queue enabled host
	Adjustment for changed recovery_notifier() callback
      mmc: sdhci-pci: Add CQHCI support for Intel GLK
	Add DCMD capability for Intel controllers except GLK

Changes since V4:
      mmc: core: Add mmc_retune_hold_now()
	Add explanation to commit message.
      mmc: host: Add CQE interface
	Add comments to callback declarations.
      mmc: core: Turn off CQE before sending commands
	Add explanation to commit message.
      mmc: core: Add support for handling CQE requests
	Add comments as requested by Ulf.
      mmc: core: Remove unused MMC_CAP2_PACKED_CMD
	New patch.
      mmc: mmc: Enable Command Queuing
	Adjust for removal of MMC_CAP2_PACKED_CMD.
	Add a comment about Packed Commands.
      mmc: mmc: Enable CQE's
	Remove un-necessary check for MMC_CAP2_CQE
      mmc: block: Use local variables in mmc_blk_data_prep()
	New patch.
      mmc: block: Prepare CQE data
	Adjust due to "mmc: block: Use local variables in mmc_blk_data_prep()"
	Remove priority setting.
	Add explanation to commit message.
      mmc: cqhci: support for command queue enabled host
	Fix transfer descriptor setting in cqhci_set_tran_desc() for 32-bit DMA

Changes since V3:
	Adjusted ...blk_end_request...() for new block status codes
	Fixed CQHCI transaction descriptor for "no DCMD" case

Changes since V2:
	Dropped patches that have been applied.
	Re-based
	Added "mmc: sdhci-pci: Add CQHCI support for Intel GLK"

Changes since V1:

	"Share mmc request array between partitions" is dependent
	on changes in "Introduce queue semantics", so added that
	and block fixes:

	Added "Fix is_waiting_last_req set incorrectly"
	Added "Fix cmd error reset failure path"
	Added "Use local var for mqrq_cur"
	Added "Introduce queue semantics"

Changes since RFC:

	Re-based on next.
	Added comment about command queue priority.
	Added some acks and reviews.


Adrian Hunter (14):
      mmc: core: Remove unnecessary host claim
      mmc: core: Introduce host claiming by context
      mmc: core: Add support for handling CQE requests
      mmc: mmc: Enable Command Queuing
      mmc: mmc: Enable CQE's
      mmc: block: Use local variables in mmc_blk_data_prep()
      mmc: block: Prepare CQE data
      mmc: block: Factor out mmc_setup_queue()
      mmc: core: Add parameter use_blk_mq
      mmc: core: Export mmc_start_bkops()
      mmc: core: Export mmc_start_request()
      mmc: core: Export mmc_retune_hold_now() and mmc_retune_release()
      mmc: block: Add CQE and blk-mq support
      mmc: sdhci-pci: Add CQHCI support for Intel GLK

Venkat Gopalakrishnan (1):
      mmc: cqhci: support for command queue enabled host

 drivers/mmc/Kconfig               |   11 +
 drivers/mmc/core/block.c          |  779 ++++++++++++++++++++++++-
 drivers/mmc/core/block.h          |    8 +
 drivers/mmc/core/bus.c            |    7 +
 drivers/mmc/core/core.c           |  221 ++++++-
 drivers/mmc/core/core.h           |   17 +-
 drivers/mmc/core/host.c           |    9 +-
 drivers/mmc/core/host.h           |   11 +-
 drivers/mmc/core/mmc.c            |   33 +-
 drivers/mmc/core/mmc_ops.c        |    6 +-
 drivers/mmc/core/queue.c          |  466 +++++++++++++--
 drivers/mmc/core/queue.h          |   54 +-
 drivers/mmc/core/sd.c             |    4 +-
 drivers/mmc/core/sdio_irq.c       |    3 +-
 drivers/mmc/host/Kconfig          |   14 +
 drivers/mmc/host/Makefile         |    1 +
 drivers/mmc/host/cqhci.c          | 1154 +++++++++++++++++++++++++++++++++++++
 drivers/mmc/host/cqhci.h          |  240 ++++++++
 drivers/mmc/host/sdhci-pci-core.c |  155 ++++-
 include/linux/mmc/host.h          |   10 +-
 20 files changed, 3108 insertions(+), 95 deletions(-)
 create mode 100644 drivers/mmc/host/cqhci.c
 create mode 100644 drivers/mmc/host/cqhci.h


Regards
Adrian

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#1737467 — [PATCH V9 02/15] mmc: core: Introduce host claiming by context

FromAdrian Hunter <adrian.hunter@intel.com>
Date2017-09-22 14:50 +0200
Subject[PATCH V9 02/15] mmc: core: Introduce host claiming by context
Message-ID<usvz4-68T-29@gated-at.bofh.it>
In reply to#1737465
Currently the host can be claimed by a task.  Change this so that the host
can be claimed by a context that may or may not be a task.  This provides
for the host to be claimed by a block driver queue to support blk-mq, while
maintaining compatibility with the existing use of mmc_claim_host().

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
 drivers/mmc/core/block.c    |  4 ++--
 drivers/mmc/core/core.c     | 48 ++++++++++++++++++++++++++++++++++++++-------
 drivers/mmc/core/core.h     |  9 +++++----
 drivers/mmc/core/mmc.c      |  4 ++--
 drivers/mmc/core/sd.c       |  4 ++--
 drivers/mmc/core/sdio_irq.c |  3 ++-
 include/linux/mmc/host.h    |  7 ++++++-
 7 files changed, 60 insertions(+), 19 deletions(-)

diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
index ab9c780df750..41e7124b8679 100644
--- a/drivers/mmc/core/block.c
+++ b/drivers/mmc/core/block.c
@@ -1989,7 +1989,7 @@ void mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
 
 	if (req && !mq->qcnt)
 		/* claim host only for the first request */
-		mmc_get_card(card);
+		mmc_get_card(card, NULL);
 
 	ret = mmc_blk_part_switch(card, md->part_type);
 	if (ret) {
@@ -2052,7 +2052,7 @@ void mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
 
 out:
 	if (!mq->qcnt)
-		mmc_put_card(card);
+		mmc_put_card(card, NULL);
 }
 
 static inline int mmc_blk_readonly(struct mmc_card *card)
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 66c9cf49ad2f..b997cf92ce6c 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -832,9 +832,36 @@ unsigned int mmc_align_data_size(struct mmc_card *card, unsigned int sz)
 }
 EXPORT_SYMBOL(mmc_align_data_size);
 
+/*
+ * Allow claiming an already claimed host if the context is the same or there is
+ * no context but the task is the same.
+ */
+static inline bool mmc_ctx_matches(struct mmc_host *host, struct mmc_ctx *ctx,
+				   struct task_struct *task)
+{
+	return host->claimer == ctx ||
+	       (!ctx && task && host->claimer->task == task);
+}
+
+static inline void mmc_ctx_set_claimer(struct mmc_host *host,
+				       struct mmc_ctx *ctx,
+				       struct task_struct *task)
+{
+	if (!host->claimer) {
+		if (ctx)
+			host->claimer = ctx;
+		else
+			host->claimer = &host->default_ctx;
+	}
+	if (task)
+		host->claimer->task = task;
+}
+
 /**
  *	__mmc_claim_host - exclusively claim a host
  *	@host: mmc host to claim
+ *	@ctx: context that claims the host or NULL in which case the default
+ *	context will be used
  *	@abort: whether or not the operation should be aborted
  *
  *	Claim a host for a set of operations.  If @abort is non null and
@@ -842,8 +869,10 @@ unsigned int mmc_align_data_size(struct mmc_card *card, unsigned int sz)
  *	that non-zero value without acquiring the lock.  Returns zero
  *	with the lock held otherwise.
  */
-int __mmc_claim_host(struct mmc_host *host, atomic_t *abort)
+int __mmc_claim_host(struct mmc_host *host, struct mmc_ctx *ctx,
+		     atomic_t *abort)
 {
+	struct task_struct *task = ctx ? NULL : current;
 	DECLARE_WAITQUEUE(wait, current);
 	unsigned long flags;
 	int stop;
@@ -856,7 +885,7 @@ int __mmc_claim_host(struct mmc_host *host, atomic_t *abort)
 	while (1) {
 		set_current_state(TASK_UNINTERRUPTIBLE);
 		stop = abort ? atomic_read(abort) : 0;
-		if (stop || !host->claimed || host->claimer == current)
+		if (stop || !host->claimed || mmc_ctx_matches(host, ctx, task))
 			break;
 		spin_unlock_irqrestore(&host->lock, flags);
 		schedule();
@@ -865,7 +894,7 @@ int __mmc_claim_host(struct mmc_host *host, atomic_t *abort)
 	set_current_state(TASK_RUNNING);
 	if (!stop) {
 		host->claimed = 1;
-		host->claimer = current;
+		mmc_ctx_set_claimer(host, ctx, task);
 		host->claim_cnt += 1;
 		if (host->claim_cnt == 1)
 			pm = true;
@@ -900,6 +929,7 @@ void mmc_release_host(struct mmc_host *host)
 		spin_unlock_irqrestore(&host->lock, flags);
 	} else {
 		host->claimed = 0;
+		host->claimer->task = NULL;
 		host->claimer = NULL;
 		spin_unlock_irqrestore(&host->lock, flags);
 		wake_up(&host->wq);
@@ -913,10 +943,10 @@ void mmc_release_host(struct mmc_host *host)
  * This is a helper function, which fetches a runtime pm reference for the
  * card device and also claims the host.
  */
-void mmc_get_card(struct mmc_card *card)
+void mmc_get_card(struct mmc_card *card, struct mmc_ctx *ctx)
 {
 	pm_runtime_get_sync(&card->dev);
-	mmc_claim_host(card->host);
+	__mmc_claim_host(card->host, ctx, NULL);
 }
 EXPORT_SYMBOL(mmc_get_card);
 
@@ -924,9 +954,13 @@ void mmc_get_card(struct mmc_card *card)
  * This is a helper function, which releases the host and drops the runtime
  * pm reference for the card device.
  */
-void mmc_put_card(struct mmc_card *card)
+void mmc_put_card(struct mmc_card *card, struct mmc_ctx *ctx)
 {
-	mmc_release_host(card->host);
+	struct mmc_host *host = card->host;
+
+	WARN_ON(ctx && host->claimer != ctx);
+
+	mmc_release_host(host);
 	pm_runtime_mark_last_busy(&card->dev);
 	pm_runtime_put_autosuspend(&card->dev);
 }
diff --git a/drivers/mmc/core/core.h b/drivers/mmc/core/core.h
index ca861091a776..94675f88f704 100644
--- a/drivers/mmc/core/core.h
+++ b/drivers/mmc/core/core.h
@@ -128,10 +128,11 @@ int mmc_erase_group_aligned(struct mmc_card *card, unsigned int from,
 int mmc_set_blockcount(struct mmc_card *card, unsigned int blockcount,
 			bool is_rel_write);
 
-int __mmc_claim_host(struct mmc_host *host, atomic_t *abort);
+int __mmc_claim_host(struct mmc_host *host, struct mmc_ctx *ctx,
+		     atomic_t *abort);
 void mmc_release_host(struct mmc_host *host);
-void mmc_get_card(struct mmc_card *card);
-void mmc_put_card(struct mmc_card *card);
+void mmc_get_card(struct mmc_card *card, struct mmc_ctx *ctx);
+void mmc_put_card(struct mmc_card *card, struct mmc_ctx *ctx);
 
 /**
  *	mmc_claim_host - exclusively claim a host
@@ -141,7 +142,7 @@ int mmc_set_blockcount(struct mmc_card *card, unsigned int blockcount,
  */
 static inline void mmc_claim_host(struct mmc_host *host)
 {
-	__mmc_claim_host(host, NULL);
+	__mmc_claim_host(host, NULL, NULL);
 }
 
 #endif
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index a7eb623f8daa..3927157207b9 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -1909,14 +1909,14 @@ static void mmc_detect(struct mmc_host *host)
 {
 	int err;
 
-	mmc_get_card(host->card);
+	mmc_get_card(host->card, NULL);
 
 	/*
 	 * Just check if our card has been removed.
 	 */
 	err = _mmc_detect_card_removed(host);
 
-	mmc_put_card(host->card);
+	mmc_put_card(host->card, NULL);
 
 	if (err) {
 		mmc_remove(host);
diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c
index 4fd1620b732d..2036b2b4835c 100644
--- a/drivers/mmc/core/sd.c
+++ b/drivers/mmc/core/sd.c
@@ -1056,14 +1056,14 @@ static void mmc_sd_detect(struct mmc_host *host)
 {
 	int err;
 
-	mmc_get_card(host->card);
+	mmc_get_card(host->card, NULL);
 
 	/*
 	 * Just check if our card has been removed.
 	 */
 	err = _mmc_detect_card_removed(host);
 
-	mmc_put_card(host->card);
+	mmc_put_card(host->card, NULL);
 
 	if (err) {
 		mmc_sd_remove(host);
diff --git a/drivers/mmc/core/sdio_irq.c b/drivers/mmc/core/sdio_irq.c
index c771843e4c15..7a2eaf8410a3 100644
--- a/drivers/mmc/core/sdio_irq.c
+++ b/drivers/mmc/core/sdio_irq.c
@@ -155,7 +155,8 @@ static int sdio_irq_thread(void *_host)
 		 * holding of the host lock does not cover too much work
 		 * that doesn't require that lock to be held.
 		 */
-		ret = __mmc_claim_host(host, &host->sdio_irq_thread_abort);
+		ret = __mmc_claim_host(host, NULL,
+				       &host->sdio_irq_thread_abort);
 		if (ret)
 			break;
 		ret = process_sdio_pending_irqs(host);
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index 9a43763a68ad..443f7a8cdfe5 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -255,6 +255,10 @@ struct mmc_supply {
 	struct regulator *vqmmc;	/* Optional Vccq supply */
 };
 
+struct mmc_ctx {
+	struct task_struct *task;
+};
+
 struct mmc_host {
 	struct device		*parent;
 	struct device		class_dev;
@@ -388,8 +392,9 @@ struct mmc_host {
 	struct mmc_card		*card;		/* device attached to this host */
 
 	wait_queue_head_t	wq;
-	struct task_struct	*claimer;	/* task that has host claimed */
+	struct mmc_ctx		*claimer;	/* context that has host claimed */
 	int			claim_cnt;	/* "claim" nesting count */
+	struct mmc_ctx		default_ctx;	/* default context */
 
 	struct delayed_work	detect;
 	int			detect_change;	/* card detect flag */
-- 
1.9.1

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#1737470 — [PATCH V9 12/15] mmc: core: Export mmc_retune_hold_now() and mmc_retune_release()

FromAdrian Hunter <adrian.hunter@intel.com>
Date2017-09-22 14:50 +0200
Subject[PATCH V9 12/15] mmc: core: Export mmc_retune_hold_now() and mmc_retune_release()
Message-ID<usvz4-68T-31@gated-at.bofh.it>
In reply to#1737465
Export mmc_retune_hold_now() and mmc_retune_release() so they can be used
by the block driver.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
 drivers/mmc/core/host.c | 7 +------
 drivers/mmc/core/host.h | 7 ++++++-
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c
index b624dbb6cd15..1539ce0da196 100644
--- a/drivers/mmc/core/host.c
+++ b/drivers/mmc/core/host.c
@@ -111,12 +111,6 @@ void mmc_retune_hold(struct mmc_host *host)
 	host->hold_retune += 1;
 }
 
-void mmc_retune_hold_now(struct mmc_host *host)
-{
-	host->retune_now = 0;
-	host->hold_retune += 1;
-}
-
 void mmc_retune_release(struct mmc_host *host)
 {
 	if (host->hold_retune)
@@ -124,6 +118,7 @@ void mmc_retune_release(struct mmc_host *host)
 	else
 		WARN_ON(1);
 }
+EXPORT_SYMBOL(mmc_retune_release);
 
 int mmc_retune(struct mmc_host *host)
 {
diff --git a/drivers/mmc/core/host.h b/drivers/mmc/core/host.h
index 170fe5947087..6eaf558e62d6 100644
--- a/drivers/mmc/core/host.h
+++ b/drivers/mmc/core/host.h
@@ -19,12 +19,17 @@
 void mmc_retune_enable(struct mmc_host *host);
 void mmc_retune_disable(struct mmc_host *host);
 void mmc_retune_hold(struct mmc_host *host);
-void mmc_retune_hold_now(struct mmc_host *host);
 void mmc_retune_release(struct mmc_host *host);
 int mmc_retune(struct mmc_host *host);
 void mmc_retune_pause(struct mmc_host *host);
 void mmc_retune_unpause(struct mmc_host *host);
 
+static inline void mmc_retune_hold_now(struct mmc_host *host)
+{
+	host->retune_now = 0;
+	host->hold_retune += 1;
+}
+
 static inline void mmc_retune_recheck(struct mmc_host *host)
 {
 	if (host->hold_retune <= 1)
-- 
1.9.1

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#1740284 — Re: [PATCH V9 12/15] mmc: core: Export mmc_retune_hold_now() and mmc_retune_release()

FromLinus Walleij <linus.walleij@linaro.org>
Date2017-09-27 01:50 +0200
SubjectRe: [PATCH V9 12/15] mmc: core: Export mmc_retune_hold_now() and mmc_retune_release()
Message-ID<uu7LY-2Wl-7@gated-at.bofh.it>
In reply to#1737470
On Fri, Sep 22, 2017 at 2:37 PM, Adrian Hunter <adrian.hunter@intel.com> wrote:

> Export mmc_retune_hold_now() and mmc_retune_release() so they can be used
> by the block driver.
>
> Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>

Actually you convert mmc_retune_hold_now() into a static inline, so the commit
message is a bit ambigous but who cares.
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>

Yours,
Linus Walleij

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#1743018 — Re: [PATCH V9 12/15] mmc: core: Export mmc_retune_hold_now() and mmc_retune_release()

FromUlf Hansson <ulf.hansson@linaro.org>
Date2017-10-02 10:40 +0200
SubjectRe: [PATCH V9 12/15] mmc: core: Export mmc_retune_hold_now() and mmc_retune_release()
Message-ID<uw4qC-52e-13@gated-at.bofh.it>
In reply to#1737470
On 22 September 2017 at 14:37, Adrian Hunter <adrian.hunter@intel.com> wrote:
> Export mmc_retune_hold_now() and mmc_retune_release() so they can be used
> by the block driver.
>
> Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>

I decided to squash patch 10/11/12 as those are all related to the
same problem when porting to blkmq.

So, thanks - applied for next!

Kind regards
Uffe

> ---
>  drivers/mmc/core/host.c | 7 +------
>  drivers/mmc/core/host.h | 7 ++++++-
>  2 files changed, 7 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c
> index b624dbb6cd15..1539ce0da196 100644
> --- a/drivers/mmc/core/host.c
> +++ b/drivers/mmc/core/host.c
> @@ -111,12 +111,6 @@ void mmc_retune_hold(struct mmc_host *host)
>         host->hold_retune += 1;
>  }
>
> -void mmc_retune_hold_now(struct mmc_host *host)
> -{
> -       host->retune_now = 0;
> -       host->hold_retune += 1;
> -}
> -
>  void mmc_retune_release(struct mmc_host *host)
>  {
>         if (host->hold_retune)
> @@ -124,6 +118,7 @@ void mmc_retune_release(struct mmc_host *host)
>         else
>                 WARN_ON(1);
>  }
> +EXPORT_SYMBOL(mmc_retune_release);
>
>  int mmc_retune(struct mmc_host *host)
>  {
> diff --git a/drivers/mmc/core/host.h b/drivers/mmc/core/host.h
> index 170fe5947087..6eaf558e62d6 100644
> --- a/drivers/mmc/core/host.h
> +++ b/drivers/mmc/core/host.h
> @@ -19,12 +19,17 @@
>  void mmc_retune_enable(struct mmc_host *host);
>  void mmc_retune_disable(struct mmc_host *host);
>  void mmc_retune_hold(struct mmc_host *host);
> -void mmc_retune_hold_now(struct mmc_host *host);
>  void mmc_retune_release(struct mmc_host *host);
>  int mmc_retune(struct mmc_host *host);
>  void mmc_retune_pause(struct mmc_host *host);
>  void mmc_retune_unpause(struct mmc_host *host);
>
> +static inline void mmc_retune_hold_now(struct mmc_host *host)
> +{
> +       host->retune_now = 0;
> +       host->hold_retune += 1;
> +}
> +
>  static inline void mmc_retune_recheck(struct mmc_host *host)
>  {
>         if (host->hold_retune <= 1)
> --
> 1.9.1
>

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#1737471 — [PATCH V9 08/15] mmc: block: Factor out mmc_setup_queue()

FromAdrian Hunter <adrian.hunter@intel.com>
Date2017-09-22 14:50 +0200
Subject[PATCH V9 08/15] mmc: block: Factor out mmc_setup_queue()
Message-ID<usvz4-68T-27@gated-at.bofh.it>
In reply to#1737465
Factor out some common code that will also be used with blk-mq.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
 drivers/mmc/core/queue.c | 39 ++++++++++++++++++++++++---------------
 1 file changed, 24 insertions(+), 15 deletions(-)

diff --git a/drivers/mmc/core/queue.c b/drivers/mmc/core/queue.c
index f74f9ef460cc..4f33d277b125 100644
--- a/drivers/mmc/core/queue.c
+++ b/drivers/mmc/core/queue.c
@@ -177,6 +177,29 @@ static void mmc_exit_request(struct request_queue *q, struct request *req)
 	mq_rq->sg = NULL;
 }
 
+static void mmc_setup_queue(struct mmc_queue *mq, struct mmc_card *card)
+{
+	struct mmc_host *host = card->host;
+	u64 limit = BLK_BOUNCE_HIGH;
+
+	if (mmc_dev(host)->dma_mask && *mmc_dev(host)->dma_mask)
+		limit = (u64)dma_max_pfn(mmc_dev(host)) << PAGE_SHIFT;
+
+	queue_flag_set_unlocked(QUEUE_FLAG_NONROT, mq->queue);
+	queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, mq->queue);
+	if (mmc_can_erase(card))
+		mmc_queue_setup_discard(mq->queue, card);
+
+	blk_queue_bounce_limit(mq->queue, limit);
+	blk_queue_max_hw_sectors(mq->queue,
+		min(host->max_blk_count, host->max_req_size / 512));
+	blk_queue_max_segments(mq->queue, host->max_segs);
+	blk_queue_max_segment_size(mq->queue, host->max_seg_size);
+
+	/* Initialize thread_sem even if it is not used */
+	sema_init(&mq->thread_sem, 1);
+}
+
 /**
  * mmc_init_queue - initialise a queue structure.
  * @mq: mmc queue
@@ -190,12 +213,8 @@ int mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card,
 		   spinlock_t *lock, const char *subname)
 {
 	struct mmc_host *host = card->host;
-	u64 limit = BLK_BOUNCE_HIGH;
 	int ret = -ENOMEM;
 
-	if (mmc_dev(host)->dma_mask && *mmc_dev(host)->dma_mask)
-		limit = (u64)dma_max_pfn(mmc_dev(host)) << PAGE_SHIFT;
-
 	mq->card = card;
 	mq->queue = blk_alloc_queue(GFP_KERNEL);
 	if (!mq->queue)
@@ -214,18 +233,8 @@ int mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card,
 	}
 
 	blk_queue_prep_rq(mq->queue, mmc_prep_request);
-	queue_flag_set_unlocked(QUEUE_FLAG_NONROT, mq->queue);
-	queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, mq->queue);
-	if (mmc_can_erase(card))
-		mmc_queue_setup_discard(mq->queue, card);
 
-	blk_queue_bounce_limit(mq->queue, limit);
-	blk_queue_max_hw_sectors(mq->queue,
-		min(host->max_blk_count, host->max_req_size / 512));
-	blk_queue_max_segments(mq->queue, host->max_segs);
-	blk_queue_max_segment_size(mq->queue, host->max_seg_size);
-
-	sema_init(&mq->thread_sem, 1);
+	mmc_setup_queue(mq, card);
 
 	mq->thread = kthread_run(mmc_queue_thread, mq, "mmcqd/%d%s",
 		host->index, subname ? subname : "");
-- 
1.9.1

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#1739984 — Re: [PATCH V9 08/15] mmc: block: Factor out mmc_setup_queue()

FromLinus Walleij <linus.walleij@linaro.org>
Date2017-09-26 17:40 +0200
SubjectRe: [PATCH V9 08/15] mmc: block: Factor out mmc_setup_queue()
Message-ID<uu07M-6zu-7@gated-at.bofh.it>
In reply to#1737471
On Fri, Sep 22, 2017 at 2:36 PM, Adrian Hunter <adrian.hunter@intel.com> wrote:

> Factor out some common code that will also be used with blk-mq.
>
> Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>

Yours,
Linus Walleij

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#1737472 — [PATCH V9 10/15] mmc: core: Export mmc_start_bkops()

FromAdrian Hunter <adrian.hunter@intel.com>
Date2017-09-22 14:50 +0200
Subject[PATCH V9 10/15] mmc: core: Export mmc_start_bkops()
Message-ID<usvz5-68T-37@gated-at.bofh.it>
In reply to#1737465
Export mmc_start_bkops() so that the block driver can use it.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
 drivers/mmc/core/mmc_ops.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c
index a6b0a232f24a..908e4db03535 100644
--- a/drivers/mmc/core/mmc_ops.c
+++ b/drivers/mmc/core/mmc_ops.c
@@ -1007,6 +1007,7 @@ void mmc_start_bkops(struct mmc_card *card, bool from_exception)
 	else
 		mmc_retune_release(card->host);
 }
+EXPORT_SYMBOL(mmc_start_bkops);
 
 /*
  * Flush the cache to the non-volatile storage.
-- 
1.9.1

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#1740282 — Re: [PATCH V9 10/15] mmc: core: Export mmc_start_bkops()

FromLinus Walleij <linus.walleij@linaro.org>
Date2017-09-27 01:50 +0200
SubjectRe: [PATCH V9 10/15] mmc: core: Export mmc_start_bkops()
Message-ID<uu7LY-2Wl-1@gated-at.bofh.it>
In reply to#1737472
On Fri, Sep 22, 2017 at 2:36 PM, Adrian Hunter <adrian.hunter@intel.com> wrote:

> Export mmc_start_bkops() so that the block driver can use it.
>
> Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>

Yours,
Linus Walleij

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#1737473 — [PATCH V9 03/15] mmc: core: Add support for handling CQE requests

FromAdrian Hunter <adrian.hunter@intel.com>
Date2017-09-22 14:50 +0200
Subject[PATCH V9 03/15] mmc: core: Add support for handling CQE requests
Message-ID<usvz5-68T-41@gated-at.bofh.it>
In reply to#1737465
Add core support for handling CQE requests, including starting, completing
and recovering.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
 drivers/mmc/core/core.c  | 163 +++++++++++++++++++++++++++++++++++++++++++++--
 drivers/mmc/core/core.h  |   4 ++
 include/linux/mmc/host.h |   2 +
 3 files changed, 164 insertions(+), 5 deletions(-)

diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index b997cf92ce6c..2ff614d4ffac 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -266,7 +266,8 @@ static void __mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
 	host->ops->request(host, mrq);
 }
 
-static void mmc_mrq_pr_debug(struct mmc_host *host, struct mmc_request *mrq)
+static void mmc_mrq_pr_debug(struct mmc_host *host, struct mmc_request *mrq,
+			     bool cqe)
 {
 	if (mrq->sbc) {
 		pr_debug("<%s: starting CMD%u arg %08x flags %08x>\n",
@@ -275,9 +276,12 @@ static void mmc_mrq_pr_debug(struct mmc_host *host, struct mmc_request *mrq)
 	}
 
 	if (mrq->cmd) {
-		pr_debug("%s: starting CMD%u arg %08x flags %08x\n",
-			 mmc_hostname(host), mrq->cmd->opcode, mrq->cmd->arg,
-			 mrq->cmd->flags);
+		pr_debug("%s: starting %sCMD%u arg %08x flags %08x\n",
+			 mmc_hostname(host), cqe ? "CQE direct " : "",
+			 mrq->cmd->opcode, mrq->cmd->arg, mrq->cmd->flags);
+	} else if (cqe) {
+		pr_debug("%s: starting CQE transfer for tag %d blkaddr %u\n",
+			 mmc_hostname(host), mrq->tag, mrq->data->blk_addr);
 	}
 
 	if (mrq->data) {
@@ -342,7 +346,7 @@ static int mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
 	if (mmc_card_removed(host->card))
 		return -ENOMEDIUM;
 
-	mmc_mrq_pr_debug(host, mrq);
+	mmc_mrq_pr_debug(host, mrq, false);
 
 	WARN_ON(!host->claimed);
 
@@ -482,6 +486,155 @@ void mmc_wait_for_req_done(struct mmc_host *host, struct mmc_request *mrq)
 }
 EXPORT_SYMBOL(mmc_wait_for_req_done);
 
+/*
+ * mmc_cqe_start_req - Start a CQE request.
+ * @host: MMC host to start the request
+ * @mrq: request to start
+ *
+ * Start the request, re-tuning if needed and it is possible. Returns an error
+ * code if the request fails to start or -EBUSY if CQE is busy.
+ */
+int mmc_cqe_start_req(struct mmc_host *host, struct mmc_request *mrq)
+{
+	int err;
+
+	/*
+	 * CQE cannot process re-tuning commands. Caller must hold retuning
+	 * while CQE is in use.  Re-tuning can happen here only when CQE has no
+	 * active requests i.e. this is the first.  Note, re-tuning will call
+	 * ->cqe_off().
+	 */
+	err = mmc_retune(host);
+	if (err)
+		goto out_err;
+
+	mrq->host = host;
+
+	mmc_mrq_pr_debug(host, mrq, true);
+
+	err = mmc_mrq_prep(host, mrq);
+	if (err)
+		goto out_err;
+
+	err = host->cqe_ops->cqe_request(host, mrq);
+	if (err)
+		goto out_err;
+
+	trace_mmc_request_start(host, mrq);
+
+	return 0;
+
+out_err:
+	if (mrq->cmd) {
+		pr_debug("%s: failed to start CQE direct CMD%u, error %d\n",
+			 mmc_hostname(host), mrq->cmd->opcode, err);
+	} else {
+		pr_debug("%s: failed to start CQE transfer for tag %d, error %d\n",
+			 mmc_hostname(host), mrq->tag, err);
+	}
+	return err;
+}
+EXPORT_SYMBOL(mmc_cqe_start_req);
+
+/**
+ *	mmc_cqe_request_done - CQE has finished processing an MMC request
+ *	@host: MMC host which completed request
+ *	@mrq: MMC request which completed
+ *
+ *	CQE drivers should call this function when they have completed
+ *	their processing of a request.
+ */
+void mmc_cqe_request_done(struct mmc_host *host, struct mmc_request *mrq)
+{
+	mmc_should_fail_request(host, mrq);
+
+	/* Flag re-tuning needed on CRC errors */
+	if ((mrq->cmd && mrq->cmd->error == -EILSEQ) ||
+	    (mrq->data && mrq->data->error == -EILSEQ))
+		mmc_retune_needed(host);
+
+	trace_mmc_request_done(host, mrq);
+
+	if (mrq->cmd) {
+		pr_debug("%s: CQE req done (direct CMD%u): %d\n",
+			 mmc_hostname(host), mrq->cmd->opcode, mrq->cmd->error);
+	} else {
+		pr_debug("%s: CQE transfer done tag %d\n",
+			 mmc_hostname(host), mrq->tag);
+	}
+
+	if (mrq->data) {
+		pr_debug("%s:     %d bytes transferred: %d\n",
+			 mmc_hostname(host),
+			 mrq->data->bytes_xfered, mrq->data->error);
+	}
+
+	mrq->done(mrq);
+}
+EXPORT_SYMBOL(mmc_cqe_request_done);
+
+/**
+ *	mmc_cqe_post_req - CQE post process of a completed MMC request
+ *	@host: MMC host
+ *	@mrq: MMC request to be processed
+ */
+void mmc_cqe_post_req(struct mmc_host *host, struct mmc_request *mrq)
+{
+	if (host->cqe_ops->cqe_post_req)
+		host->cqe_ops->cqe_post_req(host, mrq);
+}
+EXPORT_SYMBOL(mmc_cqe_post_req);
+
+/* Arbitrary 1 second timeout */
+#define MMC_CQE_RECOVERY_TIMEOUT	1000
+
+/*
+ * mmc_cqe_recovery - Recover from CQE errors.
+ * @host: MMC host to recover
+ *
+ * Recovery consists of stopping CQE, stopping eMMC, discarding the queue in
+ * in eMMC, and discarding the queue in CQE. CQE must call
+ * mmc_cqe_request_done() on all requests. An error is returned if the eMMC
+ * fails to discard its queue.
+ */
+int mmc_cqe_recovery(struct mmc_host *host)
+{
+	struct mmc_command cmd;
+	int err;
+
+	mmc_retune_hold_now(host);
+
+	/*
+	 * Recovery is expected seldom, if at all, but it reduces performance,
+	 * so make sure it is not completely silent.
+	 */
+	pr_warn("%s: running CQE recovery\n", mmc_hostname(host));
+
+	host->cqe_ops->cqe_recovery_start(host);
+
+	memset(&cmd, 0, sizeof(cmd));
+	cmd.opcode       = MMC_STOP_TRANSMISSION,
+	cmd.flags        = MMC_RSP_R1B | MMC_CMD_AC,
+	cmd.flags       &= ~MMC_RSP_CRC; /* Ignore CRC */
+	cmd.busy_timeout = MMC_CQE_RECOVERY_TIMEOUT,
+	mmc_wait_for_cmd(host, &cmd, 0);
+
+	memset(&cmd, 0, sizeof(cmd));
+	cmd.opcode       = MMC_CMDQ_TASK_MGMT;
+	cmd.arg          = 1; /* Discard entire queue */
+	cmd.flags        = MMC_RSP_R1B | MMC_CMD_AC;
+	cmd.flags       &= ~MMC_RSP_CRC; /* Ignore CRC */
+	cmd.busy_timeout = MMC_CQE_RECOVERY_TIMEOUT,
+	err = mmc_wait_for_cmd(host, &cmd, 0);
+
+	host->cqe_ops->cqe_recovery_finish(host);
+
+	mmc_retune_release(host);
+
+	return err;
+}
+EXPORT_SYMBOL(mmc_cqe_recovery);
+
 /**
  *	mmc_is_req_done - Determine if a 'cap_cmd_during_tfr' request is done
  *	@host: MMC host
diff --git a/drivers/mmc/core/core.h b/drivers/mmc/core/core.h
index 94675f88f704..ba5a8fea0dc2 100644
--- a/drivers/mmc/core/core.h
+++ b/drivers/mmc/core/core.h
@@ -145,4 +145,8 @@ static inline void mmc_claim_host(struct mmc_host *host)
 	__mmc_claim_host(host, NULL, NULL);
 }
 
+int mmc_cqe_start_req(struct mmc_host *host, struct mmc_request *mrq);
+void mmc_cqe_post_req(struct mmc_host *host, struct mmc_request *mrq);
+int mmc_cqe_recovery(struct mmc_host *host);
+
 #endif
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index 443f7a8cdfe5..c296f4351c1d 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -474,6 +474,8 @@ static inline void *mmc_priv(struct mmc_host *host)
 void mmc_request_done(struct mmc_host *, struct mmc_request *);
 void mmc_command_done(struct mmc_host *host, struct mmc_request *mrq);
 
+void mmc_cqe_request_done(struct mmc_host *host, struct mmc_request *mrq);
+
 static inline void mmc_signal_sdio_irq(struct mmc_host *host)
 {
 	host->ops->enable_sdio_irq(host, 0);
-- 
1.9.1

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#1739985 — Re: [PATCH V9 03/15] mmc: core: Add support for handling CQE requests

FromLinus Walleij <linus.walleij@linaro.org>
Date2017-09-26 17:40 +0200
SubjectRe: [PATCH V9 03/15] mmc: core: Add support for handling CQE requests
Message-ID<uu07M-6zu-5@gated-at.bofh.it>
In reply to#1737473
On Fri, Sep 22, 2017 at 2:36 PM, Adrian Hunter <adrian.hunter@intel.com> wrote:

> Add core support for handling CQE requests, including starting, completing
> and recovering.
>
> Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>

Looks straight-forward to me.
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>

Yours,
Linus Walleij

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#1737474 — [PATCH V9 06/15] mmc: block: Use local variables in mmc_blk_data_prep()

FromAdrian Hunter <adrian.hunter@intel.com>
Date2017-09-22 14:50 +0200
Subject[PATCH V9 06/15] mmc: block: Use local variables in mmc_blk_data_prep()
Message-ID<usvz5-68T-39@gated-at.bofh.it>
In reply to#1737465
Use local variables in mmc_blk_data_prep() in preparation for adding CQE
support which doesn't use the output variables.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
 drivers/mmc/core/block.c | 29 ++++++++++++++++++-----------
 1 file changed, 18 insertions(+), 11 deletions(-)

diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
index 41e7124b8679..a52653ce2d3a 100644
--- a/drivers/mmc/core/block.c
+++ b/drivers/mmc/core/block.c
@@ -1575,21 +1575,22 @@ static enum mmc_blk_status mmc_blk_err_check(struct mmc_card *card,
 }
 
 static void mmc_blk_data_prep(struct mmc_queue *mq, struct mmc_queue_req *mqrq,
-			      int disable_multi, bool *do_rel_wr,
-			      bool *do_data_tag)
+			      int disable_multi, bool *do_rel_wr_p,
+			      bool *do_data_tag_p)
 {
 	struct mmc_blk_data *md = mq->blkdata;
 	struct mmc_card *card = md->queue.card;
 	struct mmc_blk_request *brq = &mqrq->brq;
 	struct request *req = mmc_queue_req_to_req(mqrq);
+	bool do_rel_wr, do_data_tag;
 
 	/*
 	 * Reliable writes are used to implement Forced Unit Access and
 	 * are supported only on MMCs.
 	 */
-	*do_rel_wr = (req->cmd_flags & REQ_FUA) &&
-		     rq_data_dir(req) == WRITE &&
-		     (md->flags & MMC_BLK_REL_WR);
+	do_rel_wr = (req->cmd_flags & REQ_FUA) &&
+		    rq_data_dir(req) == WRITE &&
+		    (md->flags & MMC_BLK_REL_WR);
 
 	memset(brq, 0, sizeof(struct mmc_blk_request));
 
@@ -1637,18 +1638,18 @@ static void mmc_blk_data_prep(struct mmc_queue *mq, struct mmc_queue_req *mqrq,
 						brq->data.blocks);
 	}
 
-	if (*do_rel_wr)
+	if (do_rel_wr)
 		mmc_apply_rel_rw(brq, card, req);
 
 	/*
 	 * Data tag is used only during writing meta data to speed
 	 * up write and any subsequent read of this meta data
 	 */
-	*do_data_tag = card->ext_csd.data_tag_unit_size &&
-		       (req->cmd_flags & REQ_META) &&
-		       (rq_data_dir(req) == WRITE) &&
-		       ((brq->data.blocks * brq->data.blksz) >=
-			card->ext_csd.data_tag_unit_size);
+	do_data_tag = card->ext_csd.data_tag_unit_size &&
+		      (req->cmd_flags & REQ_META) &&
+		      (rq_data_dir(req) == WRITE) &&
+		      ((brq->data.blocks * brq->data.blksz) >=
+		       card->ext_csd.data_tag_unit_size);
 
 	mmc_set_data_timeout(&brq->data, card);
 
@@ -1675,6 +1676,12 @@ static void mmc_blk_data_prep(struct mmc_queue *mq, struct mmc_queue_req *mqrq,
 	}
 
 	mqrq->areq.mrq = &brq->mrq;
+
+	if (do_rel_wr_p)
+		*do_rel_wr_p = do_rel_wr;
+
+	if (do_data_tag_p)
+		*do_data_tag_p = do_data_tag;
 }
 
 static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
-- 
1.9.1

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#1739991 — Re: [PATCH V9 06/15] mmc: block: Use local variables in mmc_blk_data_prep()

FromLinus Walleij <linus.walleij@linaro.org>
Date2017-09-26 17:40 +0200
SubjectRe: [PATCH V9 06/15] mmc: block: Use local variables in mmc_blk_data_prep()
Message-ID<uu07N-6zu-33@gated-at.bofh.it>
In reply to#1737474
On Fri, Sep 22, 2017 at 2:36 PM, Adrian Hunter <adrian.hunter@intel.com> wrote:

> Use local variables in mmc_blk_data_prep() in preparation for adding CQE
> support which doesn't use the output variables.
>
> Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>

Yours,
Linus Walleij

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#1737475 — [PATCH V9 15/15] mmc: sdhci-pci: Add CQHCI support for Intel GLK

FromAdrian Hunter <adrian.hunter@intel.com>
Date2017-09-22 14:50 +0200
Subject[PATCH V9 15/15] mmc: sdhci-pci: Add CQHCI support for Intel GLK
Message-ID<usvz5-68T-43@gated-at.bofh.it>
In reply to#1737465
Add CQHCI initialization and implement CQHCI operations for Intel GLK.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
 drivers/mmc/host/Kconfig          |   1 +
 drivers/mmc/host/sdhci-pci-core.c | 155 +++++++++++++++++++++++++++++++++++++-
 2 files changed, 155 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index f2751465bc54..43ce8c1077b4 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -81,6 +81,7 @@ config MMC_SDHCI_BIG_ENDIAN_32BIT_BYTE_SWAPPER
 config MMC_SDHCI_PCI
 	tristate "SDHCI support on PCI bus"
 	depends on MMC_SDHCI && PCI
+	select MMC_CQHCI
 	help
 	  This selects the PCI Secure Digital Host Controller Interface.
 	  Most controllers found today are PCI devices.
diff --git a/drivers/mmc/host/sdhci-pci-core.c b/drivers/mmc/host/sdhci-pci-core.c
index 5f3f7b51299f..36fc5c2226a1 100644
--- a/drivers/mmc/host/sdhci-pci-core.c
+++ b/drivers/mmc/host/sdhci-pci-core.c
@@ -30,6 +30,8 @@
 #include <linux/mmc/sdhci-pci-data.h>
 #include <linux/acpi.h>
 
+#include "cqhci.h"
+
 #include "sdhci.h"
 #include "sdhci-pci.h"
 #include "sdhci-pci-o2micro.h"
@@ -117,6 +119,28 @@ int sdhci_pci_resume_host(struct sdhci_pci_chip *chip)
 
 	return 0;
 }
+
+static int sdhci_cqhci_suspend(struct sdhci_pci_chip *chip)
+{
+	int ret;
+
+	ret = cqhci_suspend(chip->slots[0]->host->mmc);
+	if (ret)
+		return ret;
+
+	return sdhci_pci_suspend_host(chip);
+}
+
+static int sdhci_cqhci_resume(struct sdhci_pci_chip *chip)
+{
+	int ret;
+
+	ret = sdhci_pci_resume_host(chip);
+	if (ret)
+		return ret;
+
+	return cqhci_resume(chip->slots[0]->host->mmc);
+}
 #endif
 
 #ifdef CONFIG_PM
@@ -167,8 +191,48 @@ static int sdhci_pci_runtime_resume_host(struct sdhci_pci_chip *chip)
 
 	return 0;
 }
+
+static int sdhci_cqhci_runtime_suspend(struct sdhci_pci_chip *chip)
+{
+	int ret;
+
+	ret = cqhci_suspend(chip->slots[0]->host->mmc);
+	if (ret)
+		return ret;
+
+	return sdhci_pci_runtime_suspend_host(chip);
+}
+
+static int sdhci_cqhci_runtime_resume(struct sdhci_pci_chip *chip)
+{
+	int ret;
+
+	ret = sdhci_pci_runtime_resume_host(chip);
+	if (ret)
+		return ret;
+
+	return cqhci_resume(chip->slots[0]->host->mmc);
+}
 #endif
 
+static u32 sdhci_cqhci_irq(struct sdhci_host *host, u32 intmask)
+{
+	int cmd_error = 0;
+	int data_error = 0;
+
+	if (!sdhci_cqe_irq(host, intmask, &cmd_error, &data_error))
+		return intmask;
+
+	cqhci_irq(host->mmc, intmask, cmd_error, data_error);
+
+	return 0;
+}
+
+static void sdhci_pci_dumpregs(struct mmc_host *mmc)
+{
+	sdhci_dumpregs(mmc_priv(mmc));
+}
+
 /*****************************************************************************\
  *                                                                           *
  * Hardware specific quirk handling                                          *
@@ -582,6 +646,18 @@ static void sdhci_intel_voltage_switch(struct sdhci_host *host)
 	.voltage_switch		= sdhci_intel_voltage_switch,
 };
 
+static const struct sdhci_ops sdhci_intel_glk_ops = {
+	.set_clock		= sdhci_set_clock,
+	.set_power		= sdhci_intel_set_power,
+	.enable_dma		= sdhci_pci_enable_dma,
+	.set_bus_width		= sdhci_set_bus_width,
+	.reset			= sdhci_reset,
+	.set_uhs_signaling	= sdhci_set_uhs_signaling,
+	.hw_reset		= sdhci_pci_hw_reset,
+	.voltage_switch		= sdhci_intel_voltage_switch,
+	.irq			= sdhci_cqhci_irq,
+};
+
 static void byt_read_dsm(struct sdhci_pci_slot *slot)
 {
 	struct intel_host *intel_host = sdhci_pci_priv(slot);
@@ -611,12 +687,80 @@ static int glk_emmc_probe_slot(struct sdhci_pci_slot *slot)
 {
 	int ret = byt_emmc_probe_slot(slot);
 
+	slot->host->mmc->caps2 |= MMC_CAP2_CQE;
+
 	if (slot->chip->pdev->device != PCI_DEVICE_ID_INTEL_GLK_EMMC) {
 		slot->host->mmc->caps2 |= MMC_CAP2_HS400_ES,
 		slot->host->mmc_host_ops.hs400_enhanced_strobe =
 						intel_hs400_enhanced_strobe;
+		slot->host->mmc->caps2 |= MMC_CAP2_CQE_DCMD;
+	}
+
+	return ret;
+}
+
+static void glk_cqe_enable(struct mmc_host *mmc)
+{
+	struct sdhci_host *host = mmc_priv(mmc);
+	u32 reg;
+
+	/*
+	 * CQE gets stuck if it sees Buffer Read Enable bit set, which can be
+	 * the case after tuning, so ensure the buffer is drained.
+	 */
+	reg = sdhci_readl(host, SDHCI_PRESENT_STATE);
+	while (reg & SDHCI_DATA_AVAILABLE) {
+		sdhci_readl(host, SDHCI_BUFFER);
+		reg = sdhci_readl(host, SDHCI_PRESENT_STATE);
+	}
+
+	sdhci_cqe_enable(mmc);
+}
+
+static const struct cqhci_host_ops glk_cqhci_ops = {
+	.enable		= glk_cqe_enable,
+	.disable	= sdhci_cqe_disable,
+	.dumpregs	= sdhci_pci_dumpregs,
+};
+
+static int glk_emmc_add_host(struct sdhci_pci_slot *slot)
+{
+	struct device *dev = &slot->chip->pdev->dev;
+	struct sdhci_host *host = slot->host;
+	struct cqhci_host *cq_host;
+	bool dma64;
+	int ret;
+
+	ret = sdhci_setup_host(host);
+	if (ret)
+		return ret;
+
+	cq_host = devm_kzalloc(dev, sizeof(*cq_host), GFP_KERNEL);
+	if (!cq_host) {
+		ret = -ENOMEM;
+		goto cleanup;
 	}
 
+	cq_host->mmio = host->ioaddr + 0x200;
+	cq_host->quirks |= CQHCI_QUIRK_SHORT_TXFR_DESC_SZ;
+	cq_host->ops = &glk_cqhci_ops;
+
+	dma64 = host->flags & SDHCI_USE_64_BIT_DMA;
+	if (dma64)
+		cq_host->caps |= CQHCI_TASK_DESC_SZ_128;
+
+	ret = cqhci_init(cq_host, host->mmc, dma64);
+	if (ret)
+		goto cleanup;
+
+	ret = __sdhci_add_host(host);
+	if (ret)
+		goto cleanup;
+
+	return 0;
+
+cleanup:
+	sdhci_cleanup_host(host);
 	return ret;
 }
 
@@ -698,11 +842,20 @@ static int byt_sd_probe_slot(struct sdhci_pci_slot *slot)
 static const struct sdhci_pci_fixes sdhci_intel_glk_emmc = {
 	.allow_runtime_pm	= true,
 	.probe_slot		= glk_emmc_probe_slot,
+	.add_host		= glk_emmc_add_host,
+#ifdef CONFIG_PM_SLEEP
+	.suspend		= sdhci_cqhci_suspend,
+	.resume			= sdhci_cqhci_resume,
+#endif
+#ifdef CONFIG_PM
+	.runtime_suspend	= sdhci_cqhci_runtime_suspend,
+	.runtime_resume		= sdhci_cqhci_runtime_resume,
+#endif
 	.quirks			= SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC,
 	.quirks2		= SDHCI_QUIRK2_PRESET_VALUE_BROKEN |
 				  SDHCI_QUIRK2_CAPS_BIT63_FOR_HS400 |
 				  SDHCI_QUIRK2_STOP_WITH_TC,
-	.ops			= &sdhci_intel_byt_ops,
+	.ops			= &sdhci_intel_glk_ops,
 	.priv_size		= sizeof(struct intel_host),
 };
 
-- 
1.9.1

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#1738714 — RE: [PATCH V9 14/15] mmc: cqhci: support for command queue enabled host

FromBough Chen <haibo.chen@nxp.com>
Date2017-09-25 04:50 +0200
SubjectRE: [PATCH V9 14/15] mmc: cqhci: support for command queue enabled host
Message-ID<utrD3-7o-1@gated-at.bofh.it>
In reply to#1737465
> -----Original Message-----
> From: Adrian Hunter [mailto:adrian.hunter@intel.com]
> Sent: Friday, September 22, 2017 8:37 PM
> To: Ulf Hansson <ulf.hansson@linaro.org>
> Cc: linux-mmc <linux-mmc@vger.kernel.org>; linux-block <linux-
> block@vger.kernel.org>; linux-kernel <linux-kernel@vger.kernel.org>; Bough
> Chen <haibo.chen@nxp.com>; Alex Lemberg <alex.lemberg@sandisk.com>;
> Mateusz Nowak <mateusz.nowak@intel.com>; Yuliy Izrailov
> <Yuliy.Izrailov@sandisk.com>; Jaehoon Chung <jh80.chung@samsung.com>;
> Dong Aisheng <dongas86@gmail.com>; Das Asutosh
> <asutoshd@codeaurora.org>; Zhangfei Gao <zhangfei.gao@gmail.com>;
> Sahitya Tummala <stummala@codeaurora.org>; Harjani Ritesh
> <riteshh@codeaurora.org>; Venu Byravarasu <vbyravarasu@nvidia.com>;
> Linus Walleij <linus.walleij@linaro.org>; Shawn Lin <shawn.lin@rock-
> chips.com>; Christoph Hellwig <hch@lst.de>
> Subject: [PATCH V9 14/15] mmc: cqhci: support for command queue enabled
> host
> 
> From: Venkat Gopalakrishnan <venkatg@codeaurora.org>
> 
> This patch adds CMDQ support for command-queue compatible hosts.
> 
> Command queue is added in eMMC-5.1 specification. This enables the
> controller to process upto 32 requests at a time.
> 
> Adrian Hunter contributed renaming to cqhci, recovery, suspend and resume,
> cqhci_off, cqhci_wait_for_idle, and external timeout handling.
> 
> Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
> Signed-off-by: Sujit Reddy Thumma <sthumma@codeaurora.org>
> Signed-off-by: Konstantin Dorfman <kdorfman@codeaurora.org>
> Signed-off-by: Venkat Gopalakrishnan <venkatg@codeaurora.org>
> Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
> Signed-off-by: Ritesh Harjani <riteshh@codeaurora.org>
> Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
> ---
>  drivers/mmc/host/Kconfig  |   13 +
>  drivers/mmc/host/Makefile |    1 +
>  drivers/mmc/host/cqhci.c  | 1154
> +++++++++++++++++++++++++++++++++++++++++++++
>  drivers/mmc/host/cqhci.h  |  240 ++++++++++
>  4 files changed, 1408 insertions(+)
>  create mode 100644 drivers/mmc/host/cqhci.c  create mode 100644
> drivers/mmc/host/cqhci.h
> 
> diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig index
> 17afe1ad3a03..f2751465bc54 100644
> --- a/drivers/mmc/host/Kconfig
> +++ b/drivers/mmc/host/Kconfig
> @@ -843,6 +843,19 @@ config MMC_SUNXI
>  	  This selects support for the SD/MMC Host Controller on
>  	  Allwinner sunxi SoCs.
> 
> +config MMC_CQHCI
> +	tristate "Command Queue Host Controller Interface support"
> +	depends on HAS_DMA
> +	help
> +	  This selects the Command Queue Host Controller Interface (CQHCI)
> +	  support present in host controllers of Qualcomm Technologies, Inc
> +	  amongst others.
> +	  This controller supports eMMC devices with command queue support.
> +
> +	  If you have a controller with this interface, say Y or M here.
> +
> +	  If unsure, say N.
> +
>  config MMC_TOSHIBA_PCI
>  	tristate "Toshiba Type A SD/MMC Card Interface Driver"
>  	depends on PCI
> diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile index
> 2b5a8133948d..f01d9915304d 100644
> --- a/drivers/mmc/host/Makefile
> +++ b/drivers/mmc/host/Makefile
> @@ -90,6 +90,7 @@ obj-$(CONFIG_MMC_SDHCI_ST)		+= sdhci-st.o
>  obj-$(CONFIG_MMC_SDHCI_MICROCHIP_PIC32)	+= sdhci-pic32.o
>  obj-$(CONFIG_MMC_SDHCI_BRCMSTB)		+= sdhci-brcmstb.o
>  obj-$(CONFIG_MMC_SDHCI_OMAP)		+= sdhci-omap.o
> +obj-$(CONFIG_MMC_CQHCI)			+= cqhci.o
> 
>  ifeq ($(CONFIG_CB710_DEBUG),y)
>  	CFLAGS-cb710-mmc	+= -DDEBUG
> diff --git a/drivers/mmc/host/cqhci.c b/drivers/mmc/host/cqhci.c new file
> mode 100644 index 000000000000..eb3c1695b0c7
> --- /dev/null
> +++ b/drivers/mmc/host/cqhci.c
> @@ -0,0 +1,1154 @@
> +/* Copyright (c) 2015, The Linux Foundation. All rights reserved.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 and
> + * only version 2 as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/delay.h>
> +#include <linux/highmem.h>
> +#include <linux/io.h>
> +#include <linux/module.h>
> +#include <linux/dma-mapping.h>
> +#include <linux/slab.h>
> +#include <linux/scatterlist.h>
> +#include <linux/platform_device.h>
> +#include <linux/ktime.h>
> +
> +#include <linux/mmc/mmc.h>
> +#include <linux/mmc/host.h>
> +#include <linux/mmc/card.h>
> +
> +#include "cqhci.h"
> +
> +#define DCMD_SLOT 31
> +#define NUM_SLOTS 32
> +
> +struct cqhci_slot {
> +	struct mmc_request *mrq;
> +	unsigned int flags;
> +#define CQHCI_EXTERNAL_TIMEOUT	BIT(0)
> +#define CQHCI_COMPLETED		BIT(1)
> +#define CQHCI_HOST_CRC		BIT(2)
> +#define CQHCI_HOST_TIMEOUT	BIT(3)
> +#define CQHCI_HOST_OTHER	BIT(4)
> +};
> +
> +static inline u8 *get_desc(struct cqhci_host *cq_host, u8 tag) {
> +	return cq_host->desc_base + (tag * cq_host->slot_sz); }
> +
> +static inline u8 *get_link_desc(struct cqhci_host *cq_host, u8 tag) {
> +	u8 *desc = get_desc(cq_host, tag);
> +
> +	return desc + cq_host->task_desc_len;
> +}
> +
> +static inline dma_addr_t get_trans_desc_dma(struct cqhci_host *cq_host,
> +u8 tag) {
> +	return cq_host->trans_desc_dma_base +
> +		(cq_host->mmc->max_segs * tag *
> +		 cq_host->trans_desc_len);
> +}
> +
> +static inline u8 *get_trans_desc(struct cqhci_host *cq_host, u8 tag) {
> +	return cq_host->trans_desc_base +
> +		(cq_host->trans_desc_len * cq_host->mmc->max_segs * tag); }
> +
> +static void setup_trans_desc(struct cqhci_host *cq_host, u8 tag) {
> +	u8 *link_temp;
> +	dma_addr_t trans_temp;
> +
> +	link_temp = get_link_desc(cq_host, tag);
> +	trans_temp = get_trans_desc_dma(cq_host, tag);
> +
> +	memset(link_temp, 0, cq_host->link_desc_len);
> +	if (cq_host->link_desc_len > 8)
> +		*(link_temp + 8) = 0;
> +
> +	if (tag == DCMD_SLOT && (cq_host->mmc->caps2 &
> MMC_CAP2_CQE_DCMD)) {
> +		*link_temp = CQHCI_VALID(0) | CQHCI_ACT(0) |
> CQHCI_END(1);
> +		return;
> +	}
> +
> +	*link_temp = CQHCI_VALID(1) | CQHCI_ACT(0x6) | CQHCI_END(0);
> +
> +	if (cq_host->dma64) {
> +		__le64 *data_addr = (__le64 __force *)(link_temp + 4);
> +
> +		data_addr[0] = cpu_to_le64(trans_temp);
> +	} else {
> +		__le32 *data_addr = (__le32 __force *)(link_temp + 4);
> +
> +		data_addr[0] = cpu_to_le32(trans_temp);
> +	}
> +}
> +
> +static void cqhci_set_irqs(struct cqhci_host *cq_host, u32 set) {
> +	u32 ier;
> +
> +	ier = cqhci_readl(cq_host, CQHCI_ISTE);
> +	ier |= set;

Hi Adrian,

I think operation ' |= ' is not correct, since we will also call cqhci_set_irqs(cq_host, 0),
Which means to mask all cmdq irq,  so I think better to directly write the parameter
 'set' to ISTE and ISGE.

Best Regards,
Haibo Chen

> +	cqhci_writel(cq_host, ier, CQHCI_ISTE);
> +	cqhci_writel(cq_host, ier, CQHCI_ISGE); }
> +
> +#define DRV_NAME "cqhci"
> +

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#1738766 — Re: [PATCH V9 14/15] mmc: cqhci: support for command queue enabled host

FromAdrian Hunter <adrian.hunter@intel.com>
Date2017-09-25 08:40 +0200
SubjectRe: [PATCH V9 14/15] mmc: cqhci: support for command queue enabled host
Message-ID<utvdD-2CX-5@gated-at.bofh.it>
In reply to#1738714
On 25/09/17 05:39, Bough Chen wrote:
>> +static void cqhci_set_irqs(struct cqhci_host *cq_host, u32 set) {
>> +	u32 ier;
>> +
>> +	ier = cqhci_readl(cq_host, CQHCI_ISTE);
>> +	ier |= set;
> 
> I think operation ' |= ' is not correct, since we will also call cqhci_set_irqs(cq_host, 0),
> Which means to mask all cmdq irq,  so I think better to directly write the parameter
>  'set' to ISTE and ISGE.

True.  I will send a V10 of this patch.

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#1740260

FromUlf Hansson <ulf.hansson@linaro.org>
Date2017-09-27 00:30 +0200
Message-ID<uu6wx-2em-19@gated-at.bofh.it>
In reply to#1737465
On 22 September 2017 at 14:36, Adrian Hunter <adrian.hunter@intel.com> wrote:
> Hi
>
> Here is V9 of the hardware command queue patches without the software
> command queue patches, now using blk-mq and now with blk-mq support for
> non-CQE I/O.
>
> HW CMDQ offers 25% - 50% better random multi-threaded I/O.  I see a slight
> 2% drop in sequential read speed but no change to sequential write.
>
> Non-CQE blk-mq showed a 3% decrease in sequential read performance.  This
> seemed to be coming from the inferior latency of running work items compared
> with a dedicated thread.  Hacking blk-mq workqueue to be unbound reduced the
> performance degradation from 3% to 1%.
>
> While we should look at changing blk-mq to give better workqueue performance,
> a bigger gain is likely to be made by adding a new host API to enable the
> next already-prepared request to be issued directly from within ->done()
> callback of the current request.

I have looked at patch 1->8, and those looks nice to me so I have
applied those for next. I will do my best to review the rest asap,
however I am currently traveling so in worst case it will have wait
until next week.

Thanks and kind regards!
Uffe

>
>
> Changes since V8:
>         Re-based
>       mmc: core: Introduce host claiming by context
>         Slightly simplified as per Ulf
>       mmc: core: Export mmc_retune_hold_now() and mmc_retune_release()
>         New patch.
>       mmc: block: Add CQE and blk-mq support
>         Fix missing ->post_req() on the error path
>
> Changes since V7:
>         Re-based
>       mmc: core: Introduce host claiming by context
>         Slightly simplified
>       mmc: core: Add parameter use_blk_mq
>         New patch.
>       mmc: core: Remove unnecessary host claim
>         New patch.
>       mmc: core: Export mmc_start_bkops()
>         New patch.
>       mmc: core: Export mmc_start_request()
>         New patch.
>       mmc: block: Add CQE and blk-mq support
>         Add blk-mq support for non_CQE requests
>
> Changes since V6:
>       mmc: core: Introduce host claiming by context
>         New patch.
>       mmc: core: Move mmc_start_areq() declaration
>         Dropped because it has been applied
>       mmc: block: Fix block status codes
>         Dropped because it has been applied
>       mmc: host: Add CQE interface
>         Dropped because it has been applied
>       mmc: core: Turn off CQE before sending commands
>         Dropped because it has been applied
>       mmc: block: Factor out mmc_setup_queue()
>         New patch.
>       mmc: block: Add CQE support
>         Drop legacy support and add blk-mq support
>
> Changes since V5:
>         Re-based
>       mmc: core: Add mmc_retune_hold_now()
>         Dropped because it has been applied
>       mmc: core: Add members to mmc_request and mmc_data for CQE's
>         Dropped because it has been applied
>       mmc: core: Move mmc_start_areq() declaration
>         New patch at Ulf's request
>       mmc: block: Fix block status codes
>         Another un-related patch
>       mmc: host: Add CQE interface
>         Move recovery_notifier() callback to struct mmc_request
>       mmc: core: Add support for handling CQE requests
>         Roll __mmc_cqe_request_done() into mmc_cqe_request_done()
>         Move function declarations requested by Ulf
>       mmc: core: Remove unused MMC_CAP2_PACKED_CMD
>         Dropped because it has been applied
>       mmc: block: Add CQE support
>         Add explanation to commit message
>         Adjustment for changed recovery_notifier() callback
>       mmc: cqhci: support for command queue enabled host
>         Adjustment for changed recovery_notifier() callback
>       mmc: sdhci-pci: Add CQHCI support for Intel GLK
>         Add DCMD capability for Intel controllers except GLK
>
> Changes since V4:
>       mmc: core: Add mmc_retune_hold_now()
>         Add explanation to commit message.
>       mmc: host: Add CQE interface
>         Add comments to callback declarations.
>       mmc: core: Turn off CQE before sending commands
>         Add explanation to commit message.
>       mmc: core: Add support for handling CQE requests
>         Add comments as requested by Ulf.
>       mmc: core: Remove unused MMC_CAP2_PACKED_CMD
>         New patch.
>       mmc: mmc: Enable Command Queuing
>         Adjust for removal of MMC_CAP2_PACKED_CMD.
>         Add a comment about Packed Commands.
>       mmc: mmc: Enable CQE's
>         Remove un-necessary check for MMC_CAP2_CQE
>       mmc: block: Use local variables in mmc_blk_data_prep()
>         New patch.
>       mmc: block: Prepare CQE data
>         Adjust due to "mmc: block: Use local variables in mmc_blk_data_prep()"
>         Remove priority setting.
>         Add explanation to commit message.
>       mmc: cqhci: support for command queue enabled host
>         Fix transfer descriptor setting in cqhci_set_tran_desc() for 32-bit DMA
>
> Changes since V3:
>         Adjusted ...blk_end_request...() for new block status codes
>         Fixed CQHCI transaction descriptor for "no DCMD" case
>
> Changes since V2:
>         Dropped patches that have been applied.
>         Re-based
>         Added "mmc: sdhci-pci: Add CQHCI support for Intel GLK"
>
> Changes since V1:
>
>         "Share mmc request array between partitions" is dependent
>         on changes in "Introduce queue semantics", so added that
>         and block fixes:
>
>         Added "Fix is_waiting_last_req set incorrectly"
>         Added "Fix cmd error reset failure path"
>         Added "Use local var for mqrq_cur"
>         Added "Introduce queue semantics"
>
> Changes since RFC:
>
>         Re-based on next.
>         Added comment about command queue priority.
>         Added some acks and reviews.
>
>
> Adrian Hunter (14):
>       mmc: core: Remove unnecessary host claim
>       mmc: core: Introduce host claiming by context
>       mmc: core: Add support for handling CQE requests
>       mmc: mmc: Enable Command Queuing
>       mmc: mmc: Enable CQE's
>       mmc: block: Use local variables in mmc_blk_data_prep()
>       mmc: block: Prepare CQE data
>       mmc: block: Factor out mmc_setup_queue()
>       mmc: core: Add parameter use_blk_mq
>       mmc: core: Export mmc_start_bkops()
>       mmc: core: Export mmc_start_request()
>       mmc: core: Export mmc_retune_hold_now() and mmc_retune_release()
>       mmc: block: Add CQE and blk-mq support
>       mmc: sdhci-pci: Add CQHCI support for Intel GLK
>
> Venkat Gopalakrishnan (1):
>       mmc: cqhci: support for command queue enabled host
>
>  drivers/mmc/Kconfig               |   11 +
>  drivers/mmc/core/block.c          |  779 ++++++++++++++++++++++++-
>  drivers/mmc/core/block.h          |    8 +
>  drivers/mmc/core/bus.c            |    7 +
>  drivers/mmc/core/core.c           |  221 ++++++-
>  drivers/mmc/core/core.h           |   17 +-
>  drivers/mmc/core/host.c           |    9 +-
>  drivers/mmc/core/host.h           |   11 +-
>  drivers/mmc/core/mmc.c            |   33 +-
>  drivers/mmc/core/mmc_ops.c        |    6 +-
>  drivers/mmc/core/queue.c          |  466 +++++++++++++--
>  drivers/mmc/core/queue.h          |   54 +-
>  drivers/mmc/core/sd.c             |    4 +-
>  drivers/mmc/core/sdio_irq.c       |    3 +-
>  drivers/mmc/host/Kconfig          |   14 +
>  drivers/mmc/host/Makefile         |    1 +
>  drivers/mmc/host/cqhci.c          | 1154 +++++++++++++++++++++++++++++++++++++
>  drivers/mmc/host/cqhci.h          |  240 ++++++++
>  drivers/mmc/host/sdhci-pci-core.c |  155 ++++-
>  include/linux/mmc/host.h          |   10 +-
>  20 files changed, 3108 insertions(+), 95 deletions(-)
>  create mode 100644 drivers/mmc/host/cqhci.c
>  create mode 100644 drivers/mmc/host/cqhci.h
>
>
> Regards
> Adrian

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