[PATCH v3 01/17] ufs: core: Probe for ext_iid support

[PATCH v3 01/17] ufs: core: Probe for ext_iid support

[Asutosh Das]

Task Tag is limited to 8 bits and this restricts the number
of active IOs to 255.
In Multi-circular queue mode, this may not be enough.
The specification provides EXT_IID which can be used to increase
the number of IOs if the UFS device and UFSHC support it.
This patch adds support to probe for ext_iid support in
ufs device and UFSHC.

Co-developed-by: Can Guo <quic_cang@quicinc.com>
Signed-off-by: Can Guo <quic_cang@quicinc.com>
Signed-off-by: Asutosh Das <quic_asutoshd@quicinc.com>
---
 drivers/ufs/core/ufshcd.c | 42 ++++++++++++++++++++++++++++++++++++++++++
 include/ufs/ufs.h         |  4 ++++
 include/ufs/ufshcd.h      |  4 ++++
 include/ufs/ufshci.h      |  7 +++++++
 4 files changed, 57 insertions(+)

diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index f4f8ded..80f01d0 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -214,6 +214,17 @@ ufs_get_desired_pm_lvl_for_dev_link_state(enum ufs_dev_pwr_mode dev_state,
 	return UFS_PM_LVL_0;
 }
 
+static unsigned int ufs_get_ext_ufs_feature(struct ufs_hba *hba,
+					    const u8 *desc_buf)
+{
+	if (hba->desc_size[QUERY_DESC_IDN_DEVICE] <
+	    DEVICE_DESC_PARAM_EXT_UFS_FEATURE_SUP + 4)
+		return 0;
+
+	return get_unaligned_be32(desc_buf +
+				  DEVICE_DESC_PARAM_EXT_UFS_FEATURE_SUP);
+}
+
 static const struct ufs_dev_quirk ufs_fixups[] = {
 	/* UFS cards deviations table */
 	{ .wmanufacturerid = UFS_VENDOR_MICRON,
@@ -2239,6 +2250,10 @@ static inline int ufshcd_hba_capabilities(struct ufs_hba *hba)
 	if (err)
 		dev_err(hba->dev, "crypto setup failed\n");
 
+	hba->mcq_capabilities = ufshcd_readl(hba, REG_MCQCAP);
+	hba->ext_iid_sup = FIELD_GET(MASK_EXT_IID_SUPPORT,
+				     hba->mcq_capabilities);
+
 	return err;
 }
 
@@ -7664,6 +7679,30 @@ static void ufshcd_temp_notif_probe(struct ufs_hba *hba, const u8 *desc_buf)
 	}
 }
 
+static void ufshcd_ext_iid_probe(struct ufs_hba *hba, u8 *desc_buf)
+{
+	struct ufs_dev_info *dev_info = &hba->dev_info;
+	u32 ext_ufs_feature;
+	u32 ext_iid_en = 0;
+	int err;
+
+	/* Only UFS-4.0 and above may support EXT_IID */
+	if (dev_info->wspecversion < 0x400)
+		goto out;
+
+	ext_ufs_feature = ufs_get_ext_ufs_feature(hba, desc_buf);
+	if (!(ext_ufs_feature & UFS_DEV_EXT_IID_SUP))
+		goto out;
+
+	err = ufshcd_query_attr_retry(hba, UPIU_QUERY_OPCODE_READ_ATTR,
+				      QUERY_ATTR_IDN_EXT_IID_EN, 0, 0, &ext_iid_en);
+	if (err)
+		dev_err(hba->dev, "failed reading bEXTIIDEn. err = %d\n", err);
+
+out:
+	dev_info->b_ext_iid_en = ext_iid_en;
+}
+
 void ufshcd_fixup_dev_quirks(struct ufs_hba *hba,
 			     const struct ufs_dev_quirk *fixups)
 {
@@ -7762,6 +7801,9 @@ static int ufs_get_device_desc(struct ufs_hba *hba)
 
 	ufshcd_temp_notif_probe(hba, desc_buf);
 
+	if (hba->ext_iid_sup)
+		ufshcd_ext_iid_probe(hba, desc_buf);
+
 	/*
 	 * ufshcd_read_string_desc returns size of the string
 	 * reset the error value
diff --git a/include/ufs/ufs.h b/include/ufs/ufs.h
index 1bba3fe..ba2a1d8 100644
--- a/include/ufs/ufs.h
+++ b/include/ufs/ufs.h
@@ -165,6 +165,7 @@ enum attr_idn {
 	QUERY_ATTR_IDN_AVAIL_WB_BUFF_SIZE       = 0x1D,
 	QUERY_ATTR_IDN_WB_BUFF_LIFE_TIME_EST    = 0x1E,
 	QUERY_ATTR_IDN_CURR_WB_BUFF_SIZE        = 0x1F,
+	QUERY_ATTR_IDN_EXT_IID_EN		= 0x2A,
 };
 
 /* Descriptor idn for Query requests */
@@ -352,6 +353,7 @@ enum {
 	UFS_DEV_EXT_TEMP_NOTIF		= BIT(6),
 	UFS_DEV_HPB_SUPPORT		= BIT(7),
 	UFS_DEV_WRITE_BOOSTER_SUP	= BIT(8),
+	UFS_DEV_EXT_IID_SUP		= BIT(16),
 };
 #define UFS_DEV_HPB_SUPPORT_VERSION		0x310
 
@@ -601,6 +603,8 @@ struct ufs_dev_info {
 
 	bool	b_rpm_dev_flush_capable;
 	u8	b_presrv_uspc_en;
+	/* UFS EXT_IID Enable */
+	bool	b_ext_iid_en;
 };
 
 /*
diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h
index 7fe1a92..c29f4c8 100644
--- a/include/ufs/ufshcd.h
+++ b/include/ufs/ufshcd.h
@@ -737,6 +737,7 @@ struct ufs_hba_monitor {
  * @outstanding_lock: Protects @outstanding_reqs.
  * @outstanding_reqs: Bits representing outstanding transfer requests
  * @capabilities: UFS Controller Capabilities
+ * @mcq_capabilities: UFS Multi Circular Queue capabilities
  * @nutrs: Transfer Request Queue depth supported by controller
  * @nutmrs: Task Management Queue depth supported by controller
  * @reserved_slot: Used to submit device commands. Protected by @dev_cmd.lock.
@@ -818,6 +819,7 @@ struct ufs_hba_monitor {
  *	device
  * @complete_put: whether or not to call ufshcd_rpm_put() from inside
  *	ufshcd_resume_complete()
+ * @ext_iid_sup: is EXT_IID is supported by UFSHC
  */
 struct ufs_hba {
 	void __iomem *mmio_base;
@@ -859,6 +861,7 @@ struct ufs_hba {
 
 	u32 capabilities;
 	int nutrs;
+	u32 mcq_capabilities;
 	int nutmrs;
 	u32 reserved_slot;
 	u32 ufs_version;
@@ -965,6 +968,7 @@ struct ufs_hba {
 #endif
 	u32 luns_avail;
 	bool complete_put;
+	bool ext_iid_sup;
 };
 
 /* Returns true if clocks can be gated. Otherwise false */
diff --git a/include/ufs/ufshci.h b/include/ufs/ufshci.h
index f81aa95..ef5c3a8 100644
--- a/include/ufs/ufshci.h
+++ b/include/ufs/ufshci.h
@@ -22,6 +22,7 @@ enum {
 /* UFSHCI Registers */
 enum {
 	REG_CONTROLLER_CAPABILITIES		= 0x00,
+	REG_MCQCAP				= 0x04,
 	REG_UFS_VERSION				= 0x08,
 	REG_CONTROLLER_DEV_ID			= 0x10,
 	REG_CONTROLLER_PROD_ID			= 0x14,
@@ -68,6 +69,12 @@ enum {
 	MASK_OUT_OF_ORDER_DATA_DELIVERY_SUPPORT	= 0x02000000,
 	MASK_UIC_DME_TEST_MODE_SUPPORT		= 0x04000000,
 	MASK_CRYPTO_SUPPORT			= 0x10000000,
+	MASK_MCQ_SUPPORT			= 0x40000000,
+};
+
+/* MCQ capability mask */
+enum {
+	MASK_EXT_IID_SUPPORT = 0x00000400,
 };
 
 #define UFS_MASK(mask, offset)		((mask) << (offset))
-- 
2.7.4

Re: [PATCH v3 01/17] ufs: core: Probe for ext_iid support

[Bart Van Assche]

On 10/20/22 11:03, Asutosh Das wrote:
> +static unsigned int ufs_get_ext_ufs_feature(struct ufs_hba *hba,
> +					    const u8 *desc_buf)
> +{
> +	if (hba->desc_size[QUERY_DESC_IDN_DEVICE] <
> +	    DEVICE_DESC_PARAM_EXT_UFS_FEATURE_SUP + 4)
> +		return 0;
> +
> +	return get_unaligned_be32(desc_buf +
> +				  DEVICE_DESC_PARAM_EXT_UFS_FEATURE_SUP);
> +}

Please avoid code duplication and make ufshcd_wb_probe() and
ufshcd_temp_notif_probe() call the above function. Please also introduce
the above function and perform the requested refactoring as a separate
patch.

Otherwise this patch looks good to me.

Thanks,

Bart.

[PATCH v3 02/17] ufs: core: Optimize duplicate code to read extended feature

[Asutosh Das]

The code to parse the extended feature is duplicated more then 2
times in the ufs core. Replace the duplicated code with the
function.

Signed-off-by: Asutosh Das <quic_asutoshd@quicinc.com>
---
 drivers/ufs/core/ufshcd.c | 10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index 80f01d0..e2be3f4 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -7605,13 +7605,7 @@ static void ufshcd_wb_probe(struct ufs_hba *hba, const u8 *desc_buf)
 	     (hba->dev_quirks & UFS_DEVICE_QUIRK_SUPPORT_EXTENDED_FEATURES)))
 		goto wb_disabled;
 
-	if (hba->desc_size[QUERY_DESC_IDN_DEVICE] <
-	    DEVICE_DESC_PARAM_EXT_UFS_FEATURE_SUP + 4)
-		goto wb_disabled;
-
-	ext_ufs_feature = get_unaligned_be32(desc_buf +
-					DEVICE_DESC_PARAM_EXT_UFS_FEATURE_SUP);
-
+	ext_ufs_feature = ufs_get_ext_ufs_feature(hba, desc_buf);
 	if (!(ext_ufs_feature & UFS_DEV_WRITE_BOOSTER_SUP))
 		goto wb_disabled;
 
@@ -7665,7 +7659,7 @@ static void ufshcd_temp_notif_probe(struct ufs_hba *hba, const u8 *desc_buf)
 	if (!(hba->caps & UFSHCD_CAP_TEMP_NOTIF) || dev_info->wspecversion < 0x300)
 		return;
 
-	ext_ufs_feature = get_unaligned_be32(desc_buf + DEVICE_DESC_PARAM_EXT_UFS_FEATURE_SUP);
+	ext_ufs_feature = ufs_get_ext_ufs_feature(hba, desc_buf);
 
 	if (ext_ufs_feature & UFS_DEV_LOW_TEMP_NOTIF)
 		mask |= MASK_EE_TOO_LOW_TEMP;
-- 
2.7.4

Re: [PATCH v3 02/17] ufs: core: Optimize duplicate code to read extended feature

[Bart Van Assche]

On 10/20/22 11:03, Asutosh Das wrote:
> The code to parse the extended feature is duplicated more then 2
> times in the ufs core. Replace the duplicated code with the
> function.
> 
> Signed-off-by: Asutosh Das <quic_asutoshd@quicinc.com>
> ---
>   drivers/ufs/core/ufshcd.c | 10 ++--------
>   1 file changed, 2 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
> index 80f01d0..e2be3f4 100644
> --- a/drivers/ufs/core/ufshcd.c
> +++ b/drivers/ufs/core/ufshcd.c
> @@ -7605,13 +7605,7 @@ static void ufshcd_wb_probe(struct ufs_hba *hba, const u8 *desc_buf)
>   	     (hba->dev_quirks & UFS_DEVICE_QUIRK_SUPPORT_EXTENDED_FEATURES)))
>   		goto wb_disabled;
>   
> -	if (hba->desc_size[QUERY_DESC_IDN_DEVICE] <
> -	    DEVICE_DESC_PARAM_EXT_UFS_FEATURE_SUP + 4)
> -		goto wb_disabled;
> -
> -	ext_ufs_feature = get_unaligned_be32(desc_buf +
> -					DEVICE_DESC_PARAM_EXT_UFS_FEATURE_SUP);
> -
> +	ext_ufs_feature = ufs_get_ext_ufs_feature(hba, desc_buf);
>   	if (!(ext_ufs_feature & UFS_DEV_WRITE_BOOSTER_SUP))
>   		goto wb_disabled;
>   
> @@ -7665,7 +7659,7 @@ static void ufshcd_temp_notif_probe(struct ufs_hba *hba, const u8 *desc_buf)
>   	if (!(hba->caps & UFSHCD_CAP_TEMP_NOTIF) || dev_info->wspecversion < 0x300)
>   		return;
>   
> -	ext_ufs_feature = get_unaligned_be32(desc_buf + DEVICE_DESC_PARAM_EXT_UFS_FEATURE_SUP);
> +	ext_ufs_feature = ufs_get_ext_ufs_feature(hba, desc_buf);
>   
>   	if (ext_ufs_feature & UFS_DEV_LOW_TEMP_NOTIF)
>   		mask |= MASK_EE_TOO_LOW_TEMP;

Ah, that's the change I asked for in my reply to the previous patch :-)

Shouldn't patches 01/17 and 02/17 be reordered?

`git rebase -i` should make it easy to reorder these two patches.

Thanks,

Bart.

[PATCH v3 03/17] ufs: core: Introduce Multi-circular queue capability

[Asutosh Das]

Add support to check for MCQ capability in the UFSHC.
This capability can be used by host drivers to control
MCQ enablement.

Co-developed-by: Can Guo <quic_cang@quicinc.com>
Signed-off-by: Can Guo <quic_cang@quicinc.com>
Signed-off-by: Asutosh Das <quic_asutoshd@quicinc.com>
---
 drivers/ufs/core/ufshcd.c |  4 ++++
 include/ufs/ufshcd.h      | 13 +++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index e2be3f4..8d93797 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -2250,6 +2250,10 @@ static inline int ufshcd_hba_capabilities(struct ufs_hba *hba)
 	if (err)
 		dev_err(hba->dev, "crypto setup failed\n");
 
+	hba->mcq_sup = FIELD_GET(MASK_MCQ_SUPPORT, hba->capabilities);
+	if (!hba->mcq_sup)
+		return err;
+
 	hba->mcq_capabilities = ufshcd_readl(hba, REG_MCQCAP);
 	hba->ext_iid_sup = FIELD_GET(MASK_EXT_IID_SUPPORT,
 				     hba->mcq_capabilities);
diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h
index c29f4c8..e779bc6 100644
--- a/include/ufs/ufshcd.h
+++ b/include/ufs/ufshcd.h
@@ -660,6 +660,12 @@ enum ufshcd_caps {
 	 * notification if it is supported by the UFS device.
 	 */
 	UFSHCD_CAP_TEMP_NOTIF				= 1 << 11,
+
+	/*
+	 * This capability allows the host controller driver to turn on/off
+	 * MCQ mode. MCQ mode may be used to increase performance.
+	 */
+	UFSHCD_CAP_MCQ_EN				= 1 << 12,
 };
 
 struct ufs_hba_variant_params {
@@ -820,6 +826,7 @@ struct ufs_hba_monitor {
  * @complete_put: whether or not to call ufshcd_rpm_put() from inside
  *	ufshcd_resume_complete()
  * @ext_iid_sup: is EXT_IID is supported by UFSHC
+ * @mcq_sup: is mcq supported by UFSHC
  */
 struct ufs_hba {
 	void __iomem *mmio_base;
@@ -969,8 +976,14 @@ struct ufs_hba {
 	u32 luns_avail;
 	bool complete_put;
 	bool ext_iid_sup;
+	bool mcq_sup;
 };
 
+static inline bool is_mcq_supported(struct ufs_hba *hba)
+{
+	return hba->mcq_sup && (hba->caps & UFSHCD_CAP_MCQ_EN);
+}
+
 /* Returns true if clocks can be gated. Otherwise false */
 static inline bool ufshcd_is_clkgating_allowed(struct ufs_hba *hba)
 {
-- 
2.7.4

Re: [PATCH v3 03/17] ufs: core: Introduce Multi-circular queue capability

[Bart Van Assche]

On 10/20/22 11:03, Asutosh Das wrote:
> +
> +	/*
> +	 * This capability allows the host controller driver to turn on/off
> +	 * MCQ mode. MCQ mode may be used to increase performance.
> +	 */
> +	UFSHCD_CAP_MCQ_EN				= 1 << 12,
>   };

I prefer that the above flag would only be introduced after a need 
appears to disable MCQ, e.g. discovery of a host controller that is too 
broken to enable MCQ.

Since UFSHCI 4.0 controllers must support UFSHCI 3.0, shouldn't users 
have a way to disable MCQ, e.g. via a kernel module parameter?

Thanks,

Bart.

Re: [PATCH v3 03/17] ufs: core: Introduce Multi-circular queue capability

[Asutosh Das]

On Thu, Oct 27 2022 at 14:10 -0700, Bart Van Assche wrote:
>On 10/20/22 11:03, Asutosh Das wrote:
>>+
>>+	/*
>>+	 * This capability allows the host controller driver to turn on/off
>>+	 * MCQ mode. MCQ mode may be used to increase performance.
>>+	 */
>>+	UFSHCD_CAP_MCQ_EN				= 1 << 12,
>>  };
>
>I prefer that the above flag would only be introduced after a need 
>appears to disable MCQ, e.g. discovery of a host controller that is 
>too broken to enable MCQ.
>
I think this flag is useful during chip bring-ups &/or debugs.
Considering that this is a fairly new hardware block even though the HC supports
MCQ there could be times to keep it disabled.

>Since UFSHCI 4.0 controllers must support UFSHCI 3.0, shouldn't users 
>have a way to disable MCQ, e.g. via a kernel module parameter?
>
I can add a kernel module parameter to disable MCQ.
I think adding it to host driver (e.g. ufs-qcom) would be good.
Please let me know if you have a better place in mind.

>Thanks,
>
>Bart.

Re: [PATCH v3 03/17] ufs: core: Introduce Multi-circular queue capability

[Bart Van Assche]

On 10/28/22 09:51, Asutosh Das wrote:
> On Thu, Oct 27 2022 at 14:10 -0700, Bart Van Assche wrote:
>> Since UFSHCI 4.0 controllers must support UFSHCI 3.0, shouldn't users 
>> have a way to disable MCQ, e.g. via a kernel module parameter?
>>
> I can add a kernel module parameter to disable MCQ.
> I think adding it to host driver (e.g. ufs-qcom) would be good.
> Please let me know if you have a better place in mind.

Since this functionality is useful for all host controllers please add 
it in the core UFS host controller driver (drivers/ufs/core/ufshcd.c).

Thanks,

Bart.

RE: [PATCH v3 03/17] ufs: core: Introduce Multi-circular queue capability

[Avri Altman]

> 
> On 10/20/22 11:03, Asutosh Das wrote:
> > +
> > +     /*
> > +      * This capability allows the host controller driver to turn on/off
> > +      * MCQ mode. MCQ mode may be used to increase performance.
> > +      */
> > +     UFSHCD_CAP_MCQ_EN                               = 1 << 12,
Needs rebase?
UFSHCD_CAP_WB_WITH_CLK_SCALING already occupies that bit.

Thanks,
Avri

> >   };
> 
> I prefer that the above flag would only be introduced after a need
> appears to disable MCQ, e.g. discovery of a host controller that is too
> broken to enable MCQ.
> 
> Since UFSHCI 4.0 controllers must support UFSHCI 3.0, shouldn't users
> have a way to disable MCQ, e.g. via a kernel module parameter?
> 
> Thanks,
> 
> Bart.

[PATCH v3 04/17] ufs: core: Defer adding host to scsi if mcq is supported

[Asutosh Das]

If MCQ support is present, then enabling it would need
reallocating tags and memory. It would also free up the
already allocated memory in Single Doorbell Mode.
So defer invoking scsi_add_host() until MCQ is configured.

Co-developed-by: Can Guo <quic_cang@quicinc.com>
Signed-off-by: Can Guo <quic_cang@quicinc.com>
Signed-off-by: Asutosh Das <quic_asutoshd@quicinc.com>
---
 drivers/ufs/core/ufshcd.c | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index 8d93797..fe4b683 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -8187,6 +8187,7 @@ static int ufshcd_probe_hba(struct ufs_hba *hba, bool init_dev_params)
 	int ret;
 	unsigned long flags;
 	ktime_t start = ktime_get();
+	struct Scsi_Host *host = hba->host;
 
 	hba->ufshcd_state = UFSHCD_STATE_RESET;
 
@@ -8221,6 +8222,14 @@ static int ufshcd_probe_hba(struct ufs_hba *hba, bool init_dev_params)
 		ret = ufshcd_device_params_init(hba);
 		if (ret)
 			goto out;
+
+		if (is_mcq_supported(hba)) {
+			ret = scsi_add_host(host, hba->dev);
+			if (ret) {
+				dev_err(hba->dev, "scsi_add_host failed\n");
+				goto out;
+			}
+		}
 	}
 
 	ufshcd_tune_unipro_params(hba);
@@ -9767,10 +9776,12 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq)
 		hba->is_irq_enabled = true;
 	}
 
-	err = scsi_add_host(host, hba->dev);
-	if (err) {
-		dev_err(hba->dev, "scsi_add_host failed\n");
-		goto out_disable;
+	if (!is_mcq_supported(hba)) {
+		err = scsi_add_host(host, hba->dev);
+		if (err) {
+			dev_err(hba->dev, "scsi_add_host failed\n");
+			goto out_disable;
+		}
 	}
 
 	hba->tmf_tag_set = (struct blk_mq_tag_set) {
-- 
2.7.4

Re: [PATCH v3 04/17] ufs: core: Defer adding host to scsi if mcq is supported

[Bart Van Assche]

On 10/20/22 11:03, Asutosh Das wrote:
> If MCQ support is present, then enabling it would need
> reallocating tags and memory. It would also free up the
> already allocated memory in Single Doorbell Mode.
> So defer invoking scsi_add_host() until MCQ is configured.

The above probably should be modified to improve clarity. How about 
changing "then enabling it would need" into "enabling it after MCQ 
support has been configured would require"? Otherwise this patch looks 
good to me.

Thanks,

Bart.

[PATCH v3 05/17] ufs: core: mcq: Introduce Multi Circular Queue

[Asutosh Das]

Introduce multi-circular queue (MCQ) which has been added
in UFSHC v4.0 standard in addition to the Single Doorbell mode.
The MCQ mode supports multiple submission and completion queues.
Add support to configure the number of queues.

Co-developed-by: Can Guo <quic_cang@quicinc.com>
Signed-off-by: Can Guo <quic_cang@quicinc.com>
Signed-off-by: Asutosh Das <quic_asutoshd@quicinc.com>
---
 drivers/ufs/core/Makefile      |   2 +-
 drivers/ufs/core/ufs-mcq.c     | 113 +++++++++++++++++++++++++++++++++++++++++
 drivers/ufs/core/ufshcd-priv.h |   1 +
 drivers/ufs/core/ufshcd.c      |  12 +++++
 include/ufs/ufshcd.h           |   4 ++
 5 files changed, 131 insertions(+), 1 deletion(-)
 create mode 100644 drivers/ufs/core/ufs-mcq.c

diff --git a/drivers/ufs/core/Makefile b/drivers/ufs/core/Makefile
index 62f38c5..4d02e0f 100644
--- a/drivers/ufs/core/Makefile
+++ b/drivers/ufs/core/Makefile
@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0
 
 obj-$(CONFIG_SCSI_UFSHCD)		+= ufshcd-core.o
-ufshcd-core-y				+= ufshcd.o ufs-sysfs.o
+ufshcd-core-y				+= ufshcd.o ufs-sysfs.o ufs-mcq.o
 ufshcd-core-$(CONFIG_DEBUG_FS)		+= ufs-debugfs.o
 ufshcd-core-$(CONFIG_SCSI_UFS_BSG)	+= ufs_bsg.o
 ufshcd-core-$(CONFIG_SCSI_UFS_CRYPTO)	+= ufshcd-crypto.o
diff --git a/drivers/ufs/core/ufs-mcq.c b/drivers/ufs/core/ufs-mcq.c
new file mode 100644
index 0000000..659398d
--- /dev/null
+++ b/drivers/ufs/core/ufs-mcq.c
@@ -0,0 +1,113 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2022 Qualcomm Innovation Center. All rights reserved.
+ *
+ * Authors:
+ *	Asutosh Das <quic_asutoshd@quicinc.com>
+ *	Can Guo <quic_cang@quicinc.com>
+ */
+
+#include <asm/unaligned.h>
+#include <linux/dma-mapping.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include "ufshcd-priv.h"
+
+#define UFS_MCQ_MIN_RW_QUEUES 2
+#define UFS_MCQ_MIN_READ_QUEUES 0
+#define UFS_MCQ_NUM_DEV_CMD_QUEUES 1
+#define UFS_MCQ_MIN_POLL_QUEUES 0
+
+
+static int rw_queue_count_set(const char *val, const struct kernel_param *kp)
+{
+	return param_set_uint_minmax(val, kp, UFS_MCQ_MIN_RW_QUEUES,
+				     num_possible_cpus());
+}
+
+static const struct kernel_param_ops rw_queue_count_ops = {
+	.set = rw_queue_count_set,
+	.get = param_get_uint,
+};
+
+static unsigned int rw_queues;
+module_param_cb(rw_queues, &rw_queue_count_ops, &rw_queues, 0644);
+MODULE_PARM_DESC(rw_queues,
+		 "Number of interrupt driven I/O queues used for rw. Default value is nr_cpus");
+
+static int read_queue_count_set(const char *val, const struct kernel_param *kp)
+{
+	return param_set_uint_minmax(val, kp, UFS_MCQ_MIN_READ_QUEUES,
+				     num_possible_cpus());
+}
+
+static const struct kernel_param_ops read_queue_count_ops = {
+	.set = read_queue_count_set,
+	.get = param_get_uint,
+};
+
+static unsigned int read_queues;
+module_param_cb(read_queues, &read_queue_count_ops, &read_queues, 0644);
+MODULE_PARM_DESC(read_queues,
+		 "Number of interrupt driven read queues used for read. Default value is 0");
+
+static int poll_queue_count_set(const char *val, const struct kernel_param *kp)
+{
+	return param_set_uint_minmax(val, kp, UFS_MCQ_MIN_POLL_QUEUES,
+				     num_possible_cpus());
+}
+
+static const struct kernel_param_ops poll_queue_count_ops = {
+	.set = poll_queue_count_set,
+	.get = param_get_uint,
+};
+
+static unsigned int poll_queues = 1;
+module_param_cb(poll_queues, &poll_queue_count_ops, &poll_queues, 0644);
+MODULE_PARM_DESC(poll_queues,
+		 "Number of poll queues used for r/w. Default value is 1");
+
+static int ufshcd_mcq_config_nr_queues(struct ufs_hba *hba)
+{
+	int i;
+	u32 hba_maxq, rem, tot_queues;
+	struct Scsi_Host *host = hba->host;
+
+	hba_maxq = FIELD_GET(GENMASK(7, 0), hba->mcq_capabilities);
+
+	if (!rw_queues)
+		rw_queues = num_possible_cpus();
+
+	tot_queues = UFS_MCQ_NUM_DEV_CMD_QUEUES + read_queues + poll_queues +
+			rw_queues;
+
+	if (hba_maxq < tot_queues) {
+		dev_err(hba->dev, "Total queues (%d) exceeds HC capacity (%d)\n",
+			tot_queues, hba_maxq);
+		return -EOPNOTSUPP;
+	}
+
+	rem = hba_maxq - UFS_MCQ_NUM_DEV_CMD_QUEUES;
+	hba->nr_queues[HCTX_TYPE_DEFAULT] = min3(rem, rw_queues,
+						 num_possible_cpus());
+	rem -= hba->nr_queues[HCTX_TYPE_DEFAULT];
+	hba->nr_queues[HCTX_TYPE_POLL] = min(rem, poll_queues);
+	rem -= hba->nr_queues[HCTX_TYPE_POLL];
+	hba->nr_queues[HCTX_TYPE_READ] = min(rem, read_queues);
+
+	for (i = 0; i < HCTX_MAX_TYPES; i++)
+		host->nr_hw_queues += hba->nr_queues[i];
+
+	hba->nr_hw_queues = host->nr_hw_queues + UFS_MCQ_NUM_DEV_CMD_QUEUES;
+	return 0;
+}
+
+int ufshcd_mcq_init(struct ufs_hba *hba)
+{
+	int ret;
+
+	ret = ufshcd_mcq_config_nr_queues(hba);
+
+	return ret;
+}
+
diff --git a/drivers/ufs/core/ufshcd-priv.h b/drivers/ufs/core/ufshcd-priv.h
index 8f67db2..cf6bdd8e 100644
--- a/drivers/ufs/core/ufshcd-priv.h
+++ b/drivers/ufs/core/ufshcd-priv.h
@@ -50,6 +50,7 @@ int ufshcd_query_attr(struct ufs_hba *hba, enum query_opcode opcode,
 int ufshcd_query_flag(struct ufs_hba *hba, enum query_opcode opcode,
 	enum flag_idn idn, u8 index, bool *flag_res);
 void ufshcd_auto_hibern8_update(struct ufs_hba *hba, u32 ahit);
+int ufshcd_mcq_init(struct ufs_hba *hba);
 
 #define SD_ASCII_STD true
 #define SD_RAW false
diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index fe4b683..c83dcb95 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -8175,6 +8175,15 @@ static int ufshcd_add_lus(struct ufs_hba *hba)
 	return ret;
 }
 
+static int ufshcd_alloc_mcq(struct ufs_hba *hba)
+{
+	int ret;
+
+	ret = ufshcd_mcq_init(hba);
+
+	return ret;
+}
+
 /**
  * ufshcd_probe_hba - probe hba to detect device and initialize it
  * @hba: per-adapter instance
@@ -8224,6 +8233,9 @@ static int ufshcd_probe_hba(struct ufs_hba *hba, bool init_dev_params)
 			goto out;
 
 		if (is_mcq_supported(hba)) {
+			ret = ufshcd_alloc_mcq(hba);
+			if (ret)
+				goto out;
 			ret = scsi_add_host(host, hba->dev);
 			if (ret) {
 				dev_err(hba->dev, "scsi_add_host failed\n");
diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h
index e779bc6..a91e63e 100644
--- a/include/ufs/ufshcd.h
+++ b/include/ufs/ufshcd.h
@@ -827,6 +827,8 @@ struct ufs_hba_monitor {
  *	ufshcd_resume_complete()
  * @ext_iid_sup: is EXT_IID is supported by UFSHC
  * @mcq_sup: is mcq supported by UFSHC
+ * @nr_hw_queues: number of hardware queues configured
+ * @nr_queues: number of Queues of different queue types
  */
 struct ufs_hba {
 	void __iomem *mmio_base;
@@ -977,6 +979,8 @@ struct ufs_hba {
 	bool complete_put;
 	bool ext_iid_sup;
 	bool mcq_sup;
+	unsigned int nr_hw_queues;
+	unsigned int nr_queues[HCTX_MAX_TYPES];
 };
 
 static inline bool is_mcq_supported(struct ufs_hba *hba)
-- 
2.7.4

Re: [PATCH v3 05/17] ufs: core: mcq: Introduce Multi Circular Queue

[Bart Van Assche]

On 10/20/22 11:03, Asutosh Das wrote:
> Introduce multi-circular queue (MCQ) which has been added
> in UFSHC v4.0 standard in addition to the Single Doorbell mode.
> The MCQ mode supports multiple submission and completion queues.
> Add support to configure the number of queues.

Introduce -> Add support for?

> +static int ufshcd_alloc_mcq(struct ufs_hba *hba)
> +{
> +	int ret;
> +
> +	ret = ufshcd_mcq_init(hba);
> +
> +	return ret;
> +}

Although a later patch will modify the above function, please change the 
function body into the following in this patch:

         return ufshcd_mcq_init(hba);

Otherwise this patch looks good to me.

Thanks,

Bart.

[PATCH v3 06/17] ufs: core: mcq: Configure resource regions

[Asutosh Das]

Define the mcq resources and add support to ioremap
the resource regions.

Co-developed-by: Can Guo <quic_cang@quicinc.com>
Signed-off-by: Can Guo <quic_cang@quicinc.com>
Signed-off-by: Asutosh Das <quic_asutoshd@quicinc.com>
---
 drivers/ufs/core/ufs-mcq.c | 102 +++++++++++++++++++++++++++++++++++++++++++++
 include/ufs/ufshcd.h       |  28 +++++++++++++
 2 files changed, 130 insertions(+)

diff --git a/drivers/ufs/core/ufs-mcq.c b/drivers/ufs/core/ufs-mcq.c
index 659398d..6a34e0f 100644
--- a/drivers/ufs/core/ufs-mcq.c
+++ b/drivers/ufs/core/ufs-mcq.c
@@ -18,6 +18,11 @@
 #define UFS_MCQ_NUM_DEV_CMD_QUEUES 1
 #define UFS_MCQ_MIN_POLL_QUEUES 0
 
+#define MCQ_QCFGPTR_MASK	GENMASK(7, 0)
+#define MCQ_QCFGPTR_UNIT	0x200
+#define MCQ_SQATTR_OFFSET(c) \
+	((((c) >> 16) & MCQ_QCFGPTR_MASK) * MCQ_QCFGPTR_UNIT)
+#define MCQ_QCFG_SIZE	0x40
 
 static int rw_queue_count_set(const char *val, const struct kernel_param *kp)
 {
@@ -67,6 +72,100 @@ module_param_cb(poll_queues, &poll_queue_count_ops, &poll_queues, 0644);
 MODULE_PARM_DESC(poll_queues,
 		 "Number of poll queues used for r/w. Default value is 1");
 
+/* Resources */
+static const struct ufshcd_res_info ufs_res_info[RES_MAX] = {
+	{.name = "ufs_mem",},
+	{.name = "mcq",},
+	/* Submission Queue DAO */
+	{.name = "mcq_sqd",},
+	/* Submission Queue Interrupt Status */
+	{.name = "mcq_sqis",},
+	/* Completion Queue DAO */
+	{.name = "mcq_cqd",},
+	/* Completion Queue Interrupt Status */
+	{.name = "mcq_cqis",},
+	/* MCQ vendor specific */
+	{.name = "mcq_vs",},
+};
+
+static int ufshcd_mcq_config_resource(struct ufs_hba *hba)
+{
+	struct platform_device *pdev = to_platform_device(hba->dev);
+	struct ufshcd_res_info *res;
+	struct resource *res_mem, *res_mcq;
+	int i, ret = 0;
+
+	memcpy(hba->res, ufs_res_info, sizeof(ufs_res_info));
+
+	for (i = 0; i < RES_MAX; i++) {
+		res = &hba->res[i];
+		res->resource = platform_get_resource_byname(pdev,
+							     IORESOURCE_MEM,
+							     res->name);
+		if (!res->resource) {
+			dev_info(hba->dev, "Resource %s not provided\n", res->name);
+			if (i == RES_UFS)
+				return -ENOMEM;
+			continue;
+		} else if (i == RES_UFS) {
+			res_mem = res->resource;
+			res->base = hba->mmio_base;
+			continue;
+		}
+
+		res->base = devm_ioremap_resource(hba->dev, res->resource);
+		if (IS_ERR(res->base)) {
+			dev_err(hba->dev, "Failed to map res %s, err=%d\n",
+					 res->name, (int)PTR_ERR(res->base));
+			res->base = NULL;
+			ret = PTR_ERR(res->base);
+			return ret;
+		}
+	}
+
+	/* MCQ resource provided in DT */
+	res = &hba->res[RES_MCQ];
+	/* Bail if MCQ resource is provided */
+	if (res->base)
+		goto out;
+
+	/* Manually allocate MCQ resource from ufs_mem */
+	res_mcq = devm_kzalloc(hba->dev, sizeof(*res_mcq), GFP_KERNEL);
+	if (!res_mcq) {
+		dev_err(hba->dev, "Failed to allocate MCQ resource\n");
+		return ret;
+	}
+
+	res_mcq->start = res_mem->start +
+			 MCQ_SQATTR_OFFSET(hba->mcq_capabilities);
+	res_mcq->end = res_mcq->start + hba->nr_hw_queues * MCQ_QCFG_SIZE - 1;
+	res_mcq->flags = res_mem->flags;
+	res_mcq->name = "mcq";
+
+	ret = insert_resource(&iomem_resource, res_mcq);
+	if (ret) {
+		dev_err(hba->dev, "Failed to insert MCQ resource, err=%d\n",
+			ret);
+		devm_kfree(hba->dev, res_mcq);
+		return ret;
+	}
+
+	res->base = devm_ioremap_resource(hba->dev, res_mcq);
+	if (IS_ERR(res->base)) {
+		dev_err(hba->dev, "MCQ registers mapping failed, err=%d\n",
+			(int)PTR_ERR(res->base));
+		ret = PTR_ERR(res->base);
+		res->base = NULL;
+		remove_resource(res_mcq);
+		devm_kfree(hba->dev, res_mcq);
+		return ret;
+	}
+
+out:
+	hba->mcq_base = res->base;
+	return 0;
+}
+
 static int ufshcd_mcq_config_nr_queues(struct ufs_hba *hba)
 {
 	int i;
@@ -107,7 +206,10 @@ int ufshcd_mcq_init(struct ufs_hba *hba)
 	int ret;
 
 	ret = ufshcd_mcq_config_nr_queues(hba);
+	if (ret)
+		return ret;
 
+	ret = ufshcd_mcq_config_resource(hba);
 	return ret;
 }
 
diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h
index a91e63e..6749c5b 100644
--- a/include/ufs/ufshcd.h
+++ b/include/ufs/ufshcd.h
@@ -720,6 +720,30 @@ struct ufs_hba_monitor {
 };
 
 /**
+ * struct ufshcd_res_info_t - MCQ related resource regions
+ *
+ * @name: resource name
+ * @resource: pointer to resource region
+ * @base: register base address
+ */
+struct ufshcd_res_info {
+	const char *name;
+	struct resource *resource;
+	void __iomem *base;
+};
+
+enum ufshcd_res {
+	RES_UFS,
+	RES_MCQ,
+	RES_MCQ_SQD,
+	RES_MCQ_SQIS,
+	RES_MCQ_CQD,
+	RES_MCQ_CQIS,
+	RES_MCQ_VS,
+	RES_MAX,
+};
+
+/**
  * struct ufs_hba - per adapter private structure
  * @mmio_base: UFSHCI base register address
  * @ucdl_base_addr: UFS Command Descriptor base address
@@ -829,6 +853,8 @@ struct ufs_hba_monitor {
  * @mcq_sup: is mcq supported by UFSHC
  * @nr_hw_queues: number of hardware queues configured
  * @nr_queues: number of Queues of different queue types
+ * @res: array of resource info of MCQ registers
+ * @mcq_base: Multi circular queue registers base address
  */
 struct ufs_hba {
 	void __iomem *mmio_base;
@@ -981,6 +1007,8 @@ struct ufs_hba {
 	bool mcq_sup;
 	unsigned int nr_hw_queues;
 	unsigned int nr_queues[HCTX_MAX_TYPES];
+	struct ufshcd_res_info res[RES_MAX];
+	void __iomem *mcq_base;
 };
 
 static inline bool is_mcq_supported(struct ufs_hba *hba)
-- 
2.7.4

Re: [PATCH v3 06/17] ufs: core: mcq: Configure resource regions

[Eddie Huang]

Hi Asutosh,

On Thu, 2022-10-20 at 11:03 -0700, Asutosh Das wrote:
> Define the mcq resources and add support to ioremap
> the resource regions.
> 
> Co-developed-by: Can Guo <quic_cang@quicinc.com>
> Signed-off-by: Can Guo <quic_cang@quicinc.com>
> Signed-off-by: Asutosh Das <quic_asutoshd@quicinc.com>
> ---
>  drivers/ufs/core/ufs-mcq.c | 102
> +++++++++++++++++++++++++++++++++++++++++++++
>  include/ufs/ufshcd.h       |  28 +++++++++++++
>  2 files changed, 130 insertions(+)
> 
[....]
> 
> +
> +static int ufshcd_mcq_config_resource(struct ufs_hba *hba)
> +{
> +	struct platform_device *pdev = to_platform_device(hba->dev);
> +	struct ufshcd_res_info *res;
> +	struct resource *res_mem, *res_mcq;
> +	int i, ret = 0;
> +
> +	memcpy(hba->res, ufs_res_info, sizeof(ufs_res_info));
> +
> +	for (i = 0; i < RES_MAX; i++) {
> +		res = &hba->res[i];
> +		res->resource = platform_get_resource_byname(pdev,
> +							     IORESOURCE
> _MEM,
> +							     res-
> >name);
> 

Please check patch[1] for mcq_config_resource vops

[1] 
https://patchwork.kernel.org/project/linux-scsi/patch/20221026073943.22111-2-eddie.huang@mediatek.com/
 

Eddie Huang

[PATCH v3 07/17] ufs: core: mcq: Calculate queue depth

[Asutosh Das]

The ufs device defines the supported queuedepth by
bqueuedepth which has a max value of 256.
The HC defines MAC (Max Active Commands) that define
the max number of commands that in flight to the ufs
device.
Calculate and configure the nutrs based on both these
values.

Co-developed-by: Can Guo <quic_cang@quicinc.com>
Signed-off-by: Can Guo <quic_cang@quicinc.com>
Signed-off-by: Asutosh Das <quic_asutoshd@quicinc.com>
---
 drivers/ufs/core/ufs-mcq.c     | 34 ++++++++++++++++++++++++++++++++++
 drivers/ufs/core/ufshcd-priv.h |  9 +++++++++
 drivers/ufs/core/ufshcd.c      |  9 ++++++++-
 drivers/ufs/host/ufs-qcom.c    |  8 ++++++++
 include/ufs/ufs.h              |  2 ++
 include/ufs/ufshcd.h           |  2 ++
 include/ufs/ufshci.h           |  1 +
 7 files changed, 64 insertions(+), 1 deletion(-)

diff --git a/drivers/ufs/core/ufs-mcq.c b/drivers/ufs/core/ufs-mcq.c
index 6a34e0f..c0b37d3 100644
--- a/drivers/ufs/core/ufs-mcq.c
+++ b/drivers/ufs/core/ufs-mcq.c
@@ -18,6 +18,8 @@
 #define UFS_MCQ_NUM_DEV_CMD_QUEUES 1
 #define UFS_MCQ_MIN_POLL_QUEUES 0
 
+#define MAX_DEV_CMD_ENTRIES	2
+#define MCQ_CFG_MAC_MASK	GENMASK(16, 8)
 #define MCQ_QCFGPTR_MASK	GENMASK(7, 0)
 #define MCQ_QCFGPTR_UNIT	0x200
 #define MCQ_SQATTR_OFFSET(c) \
@@ -88,6 +90,38 @@ static const struct ufshcd_res_info ufs_res_info[RES_MAX] = {
 	{.name = "mcq_vs",},
 };
 
+/**
+ * ufshcd_mcq_decide_queue_depth - decide the queue depth
+ * @hba - per adapter instance
+ *
+ * MAC - Max. Active Command of the Host Controller (HC)
+ * HC wouldn't send more than this commands to the device.
+ * The default MAC is 32, but the max. value may vary with
+ * vendor implementation.
+ * Calculates and adjusts the queue depth based on the depth
+ * supported by the HC and ufs device.
+ */
+u32 ufshcd_mcq_decide_queue_depth(struct ufs_hba *hba)
+{
+	u32 qd, val;
+	int mac;
+
+	mac = ufshcd_mcq_vops_get_hba_mac(hba);
+	if (mac < 0) {
+		val = ufshcd_readl(hba, REG_UFS_MCQ_CFG);
+		mac = FIELD_GET(MCQ_CFG_MAC_MASK, val);
+	}
+
+	/*  MAC is a 0 based value. */
+	mac += 1;
+	/* max. value of bqueuedepth = 256, mac is host dependent */
+	qd = min_t(u32, mac, hba->dev_info.bqueuedepth);
+	if (!qd)
+		qd = mac;
+
+	return qd;
+}
+
 static int ufshcd_mcq_config_resource(struct ufs_hba *hba)
 {
 	struct platform_device *pdev = to_platform_device(hba->dev);
diff --git a/drivers/ufs/core/ufshcd-priv.h b/drivers/ufs/core/ufshcd-priv.h
index cf6bdd8e..6d16beb 100644
--- a/drivers/ufs/core/ufshcd-priv.h
+++ b/drivers/ufs/core/ufshcd-priv.h
@@ -51,6 +51,7 @@ int ufshcd_query_flag(struct ufs_hba *hba, enum query_opcode opcode,
 	enum flag_idn idn, u8 index, bool *flag_res);
 void ufshcd_auto_hibern8_update(struct ufs_hba *hba, u32 ahit);
 int ufshcd_mcq_init(struct ufs_hba *hba);
+u32 ufshcd_mcq_decide_queue_depth(struct ufs_hba *hba);
 
 #define SD_ASCII_STD true
 #define SD_RAW false
@@ -216,6 +217,14 @@ static inline void ufshcd_vops_config_scaling_param(struct ufs_hba *hba,
 		hba->vops->config_scaling_param(hba, p, data);
 }
 
+static inline int ufshcd_mcq_vops_get_hba_mac(struct ufs_hba *hba)
+{
+	if (hba->vops && hba->vops->get_hba_mac)
+		return hba->vops->get_hba_mac(hba);
+
+	return -EOPNOTSUPP;
+}
+
 extern const struct ufs_pm_lvl_states ufs_pm_lvl_states[];
 
 /**
diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index c83dcb95..b928ed8 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -7762,6 +7762,7 @@ static int ufs_get_device_desc(struct ufs_hba *hba)
 	/* getting Specification Version in big endian format */
 	dev_info->wspecversion = desc_buf[DEVICE_DESC_PARAM_SPEC_VER] << 8 |
 				      desc_buf[DEVICE_DESC_PARAM_SPEC_VER + 1];
+	dev_info->bqueuedepth = desc_buf[DEVICE_DESC_PARAM_Q_DPTH];
 	b_ufs_feature_sup = desc_buf[DEVICE_DESC_PARAM_UFS_FEAT];
 
 	model_index = desc_buf[DEVICE_DESC_PARAM_PRDCT_NAME];
@@ -8178,10 +8179,16 @@ static int ufshcd_add_lus(struct ufs_hba *hba)
 static int ufshcd_alloc_mcq(struct ufs_hba *hba)
 {
 	int ret;
+	int old_nutrs = hba->nutrs;
 
+	hba->nutrs = ufshcd_mcq_decide_queue_depth(hba);
 	ret = ufshcd_mcq_init(hba);
+	if (ret) {
+		hba->nutrs = old_nutrs;
+		return ret;
+	}
 
-	return ret;
+	return 0;
 }
 
 /**
diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
index 473fad8..5dc824f 100644
--- a/drivers/ufs/host/ufs-qcom.c
+++ b/drivers/ufs/host/ufs-qcom.c
@@ -25,6 +25,7 @@
 #define UFS_QCOM_DEFAULT_DBG_PRINT_EN	\
 	(UFS_QCOM_DBG_PRINT_REGS_EN | UFS_QCOM_DBG_PRINT_TEST_BUS_EN)
 
+#define MAX_SUPP_MAC 63
 enum {
 	TSTBUS_UAWM,
 	TSTBUS_UARM,
@@ -1424,6 +1425,12 @@ static void ufs_qcom_config_scaling_param(struct ufs_hba *hba,
 }
 #endif
 
+static int ufs_qcom_get_hba_mac(struct ufs_hba *hba)
+{
+	/* Default is 32, but Qualcomm HC supports upto 64 */
+	return MAX_SUPP_MAC;
+}
+
 /*
  * struct ufs_hba_qcom_vops - UFS QCOM specific variant operations
  *
@@ -1447,6 +1454,7 @@ static const struct ufs_hba_variant_ops ufs_hba_qcom_vops = {
 	.device_reset		= ufs_qcom_device_reset,
 	.config_scaling_param = ufs_qcom_config_scaling_param,
 	.program_key		= ufs_qcom_ice_program_key,
+	.get_hba_mac		= ufs_qcom_get_hba_mac,
 };
 
 /**
diff --git a/include/ufs/ufs.h b/include/ufs/ufs.h
index ba2a1d8..5112418 100644
--- a/include/ufs/ufs.h
+++ b/include/ufs/ufs.h
@@ -591,6 +591,8 @@ struct ufs_dev_info {
 	u8	*model;
 	u16	wspecversion;
 	u32	clk_gating_wait_us;
+	/* Stores the depth of queue in UFS device */
+	u8	bqueuedepth;
 
 	/* UFS HPB related flag */
 	bool	hpb_enabled;
diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h
index 6749c5b..2ddf88d 100644
--- a/include/ufs/ufshcd.h
+++ b/include/ufs/ufshcd.h
@@ -293,6 +293,7 @@ struct ufs_pwr_mode_info {
  * @config_scaling_param: called to configure clock scaling parameters
  * @program_key: program or evict an inline encryption key
  * @event_notify: called to notify important events
+ * @get_hba_mac: called to get vendor specific mac value
  */
 struct ufs_hba_variant_ops {
 	const char *name;
@@ -331,6 +332,7 @@ struct ufs_hba_variant_ops {
 			       const union ufs_crypto_cfg_entry *cfg, int slot);
 	void	(*event_notify)(struct ufs_hba *hba,
 				enum ufs_event_type evt, void *data);
+	int	(*get_hba_mac)(struct ufs_hba *hba);
 };
 
 /* clock gating state  */
diff --git a/include/ufs/ufshci.h b/include/ufs/ufshci.h
index ef5c3a8..ca7db49d 100644
--- a/include/ufs/ufshci.h
+++ b/include/ufs/ufshci.h
@@ -57,6 +57,7 @@ enum {
 	REG_UFS_CCAP				= 0x100,
 	REG_UFS_CRYPTOCAP			= 0x104,
 
+	REG_UFS_MCQ_CFG				= 0x380,
 	UFSHCI_CRYPTO_REG_SPACE_SIZE		= 0x400,
 };
 
-- 
2.7.4

Re: [PATCH v3 07/17] ufs: core: mcq: Calculate queue depth

[Bart Van Assche]

On 10/20/22 11:03, Asutosh Das wrote:
> +u32 ufshcd_mcq_decide_queue_depth(struct ufs_hba *hba)
> +{
> +	u32 qd, val;
> +	int mac;
> +
> +	mac = ufshcd_mcq_vops_get_hba_mac(hba);
> +	if (mac < 0) {
> +		val = ufshcd_readl(hba, REG_UFS_MCQ_CFG);
> +		mac = FIELD_GET(MCQ_CFG_MAC_MASK, val);
> +	}

According to the UFSHCI 4.0 specification the MAC value is set by the 
host. Can the above code read the MAC value from the host controller 
before it has been set by the host? If so, how about leaving out the 
code that reads the MAC value from the controller and making it 
mandatory to implement the new get_hba_mac vop?

> +
> +	/*  MAC is a 0 based value. */
> +	mac += 1;
> +	/* max. value of bqueuedepth = 256, mac is host dependent */

host dependent -> defined by the host controller?

> +	qd = min_t(u32, mac, hba->dev_info.bqueuedepth);
> +	if (!qd)
> +		qd = mac;

How about using min_not_zero() instead of open-coding it?

Thanks,

Bart.

RE: [PATCH v3 07/17] ufs: core: mcq: Calculate queue depth

[Avri Altman]

> On 10/20/22 11:03, Asutosh Das wrote:
> > +u32 ufshcd_mcq_decide_queue_depth(struct ufs_hba *hba)
> > +{
> > +     u32 qd, val;
> > +     int mac;
> > +
> > +     mac = ufshcd_mcq_vops_get_hba_mac(hba);
> > +     if (mac < 0) {
> > +             val = ufshcd_readl(hba, REG_UFS_MCQ_CFG);
> > +             mac = FIELD_GET(MCQ_CFG_MAC_MASK, val);
> > +     }
> 
> According to the UFSHCI 4.0 specification the MAC value is set by the
> host. Can the above code read the MAC value from the host controller
> before it has been set by the host? If so, how about leaving out the
> code that reads the MAC value from the controller and making it
> mandatory to implement the new get_hba_mac vop?
> 
> > +
> > +     /*  MAC is a 0 based value. */
> > +     mac += 1;
> > +     /* max. value of bqueuedepth = 256, mac is host dependent */
> 
> host dependent -> defined by the host controller?
> 
> > +     qd = min_t(u32, mac, hba->dev_info.bqueuedepth);
> > +     if (!qd)
> > +             qd = mac;
Isn't if mcq is supported bqueuedepth can't be zero?
The device must implements the shared queueing architecture.

Thanks,
Avri

> 
> How about using min_not_zero() instead of open-coding it?
> 
> Thanks,
> 
> Bart.

Re: [PATCH v3 07/17] ufs: core: mcq: Calculate queue depth

[Asutosh Das]

On Sun, Oct 30 2022 at 04:43 -0700, Avri Altman wrote:
>> On 10/20/22 11:03, Asutosh Das wrote:
>> > +u32 ufshcd_mcq_decide_queue_depth(struct ufs_hba *hba)

[...]

>> > +     qd = min_t(u32, mac, hba->dev_info.bqueuedepth);
>> > +     if (!qd)
>> > +             qd = mac;
>Isn't if mcq is supported bqueuedepth can't be zero?
>The device must implements the shared queueing architecture.
>
Ah well, there's a Note mentioned in the UFS 4.0 spec (#7021) which kind of
confused me. I will remove this check if it can't be 0.

-asd
>

Re: [PATCH v3 07/17] ufs: core: mcq: Calculate queue depth

[Asutosh Das]

On Thu, Oct 27 2022 at 14:52 -0700, Bart Van Assche wrote:
>On 10/20/22 11:03, Asutosh Das wrote:
>>+u32 ufshcd_mcq_decide_queue_depth(struct ufs_hba *hba)
>>+{
>>+	u32 qd, val;
>>+	int mac;
>>+
>>+	mac = ufshcd_mcq_vops_get_hba_mac(hba);
>>+	if (mac < 0) {
>>+		val = ufshcd_readl(hba, REG_UFS_MCQ_CFG);
>>+		mac = FIELD_GET(MCQ_CFG_MAC_MASK, val);
>>+	}
>
>According to the UFSHCI 4.0 specification the MAC value is set by the 
>host. Can the above code read the MAC value from the host controller 
>before it has been set by the host? If so, how about leaving out the 
>code that reads the MAC value from the controller and making it 
>mandatory to implement the new get_hba_mac vop?
>
The reason it is not mandatory to define get_hba_mac vop is UFSHCI 4.0
specification mentions that the default value of MAC is 32. So even if a vendor
HC doesn't override the MAC, it'd be 32.
Hence, the current code first checks for an override, and if there's none uses
the default value defined in the HC.

-asd

Re: [PATCH v3 07/17] ufs: core: mcq: Calculate queue depth

[Bart Van Assche]

On 10/31/22 12:24, Asutosh Das wrote:
> On Thu, Oct 27 2022 at 14:52 -0700, Bart Van Assche wrote:
>> On 10/20/22 11:03, Asutosh Das wrote:
>>> +u32 ufshcd_mcq_decide_queue_depth(struct ufs_hba *hba)
>>> +{
>>> +    u32 qd, val;
>>> +    int mac;
>>> +
>>> +    mac = ufshcd_mcq_vops_get_hba_mac(hba);
>>> +    if (mac < 0) {
>>> +        val = ufshcd_readl(hba, REG_UFS_MCQ_CFG);
>>> +        mac = FIELD_GET(MCQ_CFG_MAC_MASK, val);
>>> +    }
>>
>> According to the UFSHCI 4.0 specification the MAC value is set by the 
>> host. Can the above code read the MAC value from the host controller 
>> before it has been set by the host? If so, how about leaving out the 
>> code that reads the MAC value from the controller and making it 
>> mandatory to implement the new get_hba_mac vop?
>>
> The reason it is not mandatory to define get_hba_mac vop is UFSHCI 4.0
> specification mentions that the default value of MAC is 32. So even if a 
> vendor
> HC doesn't override the MAC, it'd be 32.
> Hence, the current code first checks for an override, and if there's 
> none uses
> the default value defined in the HC.

Hi Asutosh,

Please ignore the value reported by the controller in the MAC field of 
the MCQConfig register and overwrite the MAC field without reading it 
first. It doesn't seem useful to me to read this field. I think the host 
should decide about the queue depth no matter what the current value of 
the MAC field is.

Thanks,

Bart.

[PATCH v3 08/17] ufs: core: mcq: Allocate memory for mcq mode

[Asutosh Das]

To read the bqueuedepth, the device descriptor is fetched
in Single Doorbell Mode. This allocated memory may not be
enough for MCQ mode because the number of tags supported
in MCQ mode may be larger than in SDB mode.
Hence, release the memory allocated in SDB mode and allocate
memory for MCQ mode operation.
Define the ufs hardware queue and Completion Queue Entry.

Co-developed-by: Can Guo <quic_cang@quicinc.com>
Signed-off-by: Can Guo <quic_cang@quicinc.com>
Signed-off-by: Asutosh Das <quic_asutoshd@quicinc.com>
---
 drivers/ufs/core/ufs-mcq.c     | 58 ++++++++++++++++++++++++++++++++++++++++--
 drivers/ufs/core/ufshcd-priv.h |  1 +
 drivers/ufs/core/ufshcd.c      | 42 +++++++++++++++++++++++++++---
 include/ufs/ufshcd.h           | 19 ++++++++++++++
 include/ufs/ufshci.h           | 21 +++++++++++++++
 5 files changed, 136 insertions(+), 5 deletions(-)

diff --git a/drivers/ufs/core/ufs-mcq.c b/drivers/ufs/core/ufs-mcq.c
index c0b37d3..14d808a 100644
--- a/drivers/ufs/core/ufs-mcq.c
+++ b/drivers/ufs/core/ufs-mcq.c
@@ -235,15 +235,69 @@ static int ufshcd_mcq_config_nr_queues(struct ufs_hba *hba)
 	return 0;
 }
 
+int ufshcd_mcq_memory_alloc(struct ufs_hba *hba)
+{
+	struct ufs_hw_queue *hwq;
+	size_t utrdl_size, cqe_size;
+	int i;
+
+	for (i = 0; i < hba->nr_hw_queues; i++) {
+		hwq = &hba->uhq[i];
+
+		utrdl_size = sizeof(struct utp_transfer_req_desc) *
+			     hwq->max_entries;
+		hwq->sqe_base_addr = dmam_alloc_coherent(hba->dev, utrdl_size,
+							 &hwq->sqe_dma_addr,
+							 GFP_KERNEL);
+		if (!hwq->sqe_dma_addr) {
+			dev_err(hba->dev, "SQE allocation failed\n");
+			return -ENOMEM;
+		}
+
+		cqe_size = sizeof(struct cq_entry) * hwq->max_entries;
+		hwq->cqe_base_addr = dmam_alloc_coherent(hba->dev, cqe_size,
+							 &hwq->cqe_dma_addr,
+							 GFP_KERNEL);
+		if (!hwq->cqe_dma_addr) {
+			dev_err(hba->dev, "CQE allocation failed\n");
+			return -ENOMEM;
+		}
+	}
+
+	return 0;
+}
+
 int ufshcd_mcq_init(struct ufs_hba *hba)
 {
-	int ret;
+	int ret, i;
+	struct ufs_hw_queue *hwq;
 
 	ret = ufshcd_mcq_config_nr_queues(hba);
 	if (ret)
 		return ret;
 
 	ret = ufshcd_mcq_config_resource(hba);
-	return ret;
+	if (ret)
+		return ret;
+
+	hba->uhq = devm_kzalloc(hba->dev,
+				hba->nr_hw_queues * sizeof(struct ufs_hw_queue),
+				GFP_KERNEL);
+	if (!hba->uhq) {
+		dev_err(hba->dev, "ufs hw queue memory allocation failed\n");
+		return -ENOMEM;
+	}
+
+	for (i = 0; i < hba->nr_hw_queues; i++) {
+		hwq = &hba->uhq[i];
+		hwq->max_entries = hba->nutrs;
+	}
+
+	/* The very first HW queue is to serve device command */
+	hba->dev_cmd_queue = &hba->uhq[0];
+	/* Give dev_cmd_queue the minimal number of entries */
+	hba->dev_cmd_queue->max_entries = MAX_DEV_CMD_ENTRIES;
+
+	return 0;
 }
 
diff --git a/drivers/ufs/core/ufshcd-priv.h b/drivers/ufs/core/ufshcd-priv.h
index 6d16beb..f624682 100644
--- a/drivers/ufs/core/ufshcd-priv.h
+++ b/drivers/ufs/core/ufshcd-priv.h
@@ -52,6 +52,7 @@ int ufshcd_query_flag(struct ufs_hba *hba, enum query_opcode opcode,
 void ufshcd_auto_hibern8_update(struct ufs_hba *hba, u32 ahit);
 int ufshcd_mcq_init(struct ufs_hba *hba);
 u32 ufshcd_mcq_decide_queue_depth(struct ufs_hba *hba);
+int ufshcd_mcq_memory_alloc(struct ufs_hba *hba);
 
 #define SD_ASCII_STD true
 #define SD_RAW false
diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index b928ed8..e32396e 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -3686,6 +3686,12 @@ static int ufshcd_memory_alloc(struct ufs_hba *hba)
 	}
 
 	/*
+	 * Not freed if MCQ is configured see ufshcd_release_sdb_queue() and
+	 * ufshcd_config_mcq()
+	 */
+	if (hba->utmrdl_base_addr)
+		goto skip_utmrdl;
+	/*
 	 * Allocate memory for UTP Task Management descriptors
 	 * UFSHCI requires 1024 byte alignment of UTMRD
 	 */
@@ -3701,6 +3707,7 @@ static int ufshcd_memory_alloc(struct ufs_hba *hba)
 		goto out;
 	}
 
+skip_utmrdl:
 	/* Allocate memory for local reference block */
 	hba->lrb = devm_kcalloc(hba->dev,
 				hba->nutrs, sizeof(struct ufshcd_lrb),
@@ -8176,6 +8183,22 @@ static int ufshcd_add_lus(struct ufs_hba *hba)
 	return ret;
 }
 
+/* SDB - Single Doorbell */
+static void ufshcd_release_sdb_queue(struct ufs_hba *hba, int nutrs)
+{
+	size_t ucdl_size, utrdl_size;
+
+	ucdl_size = sizeof(struct utp_transfer_cmd_desc) * nutrs;
+	dmam_free_coherent(hba->dev, ucdl_size, hba->ucdl_base_addr,
+			   hba->ucdl_dma_addr);
+
+	utrdl_size = sizeof(struct utp_transfer_req_desc) * nutrs;
+	dmam_free_coherent(hba->dev, utrdl_size, hba->utrdl_base_addr,
+			   hba->utrdl_dma_addr);
+
+	devm_kfree(hba->dev, hba->lrb);
+}
+
 static int ufshcd_alloc_mcq(struct ufs_hba *hba)
 {
 	int ret;
@@ -8183,12 +8206,25 @@ static int ufshcd_alloc_mcq(struct ufs_hba *hba)
 
 	hba->nutrs = ufshcd_mcq_decide_queue_depth(hba);
 	ret = ufshcd_mcq_init(hba);
-	if (ret) {
-		hba->nutrs = old_nutrs;
-		return ret;
+	if (ret)
+		goto err;
+
+	if (hba->nutrs != old_nutrs) {
+		ufshcd_release_sdb_queue(hba, old_nutrs);
+		ret = ufshcd_memory_alloc(hba);
+		if (ret)
+			goto err;
+		ufshcd_host_memory_configure(hba);
 	}
 
+	ret = ufshcd_mcq_memory_alloc(hba);
+	if (ret)
+		goto err;
+
 	return 0;
+err:
+	hba->nutrs = old_nutrs;
+	return ret;
 }
 
 /**
diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h
index 2ddf88d..f2cea1e 100644
--- a/include/ufs/ufshcd.h
+++ b/include/ufs/ufshcd.h
@@ -857,6 +857,8 @@ enum ufshcd_res {
  * @nr_queues: number of Queues of different queue types
  * @res: array of resource info of MCQ registers
  * @mcq_base: Multi circular queue registers base address
+ * @uhq: array of supported hardware queues
+ * @dev_cmd_queue: Queue for issuing device management commands
  */
 struct ufs_hba {
 	void __iomem *mmio_base;
@@ -1011,6 +1013,23 @@ struct ufs_hba {
 	unsigned int nr_queues[HCTX_MAX_TYPES];
 	struct ufshcd_res_info res[RES_MAX];
 	void __iomem *mcq_base;
+	struct ufs_hw_queue *uhq;
+	struct ufs_hw_queue *dev_cmd_queue;
+};
+
+/**
+ * @sqe_base_addr: submission queue entry base address
+ * @sqe_dma_addr: submission queue dma address
+ * @cqe_base_addr: completion queue base address
+ * @cqe_dma_addr: completion queue dma address
+ * @max_entries: max number of slots in this hardware queue
+ */
+struct ufs_hw_queue {
+	void *sqe_base_addr;
+	dma_addr_t sqe_dma_addr;
+	struct cq_entry *cqe_base_addr;
+	dma_addr_t cqe_dma_addr;
+	u32 max_entries;
 };
 
 static inline bool is_mcq_supported(struct ufs_hba *hba)
diff --git a/include/ufs/ufshci.h b/include/ufs/ufshci.h
index ca7db49d..7fa8faf 100644
--- a/include/ufs/ufshci.h
+++ b/include/ufs/ufshci.h
@@ -490,6 +490,27 @@ struct utp_transfer_req_desc {
 	__le16  prd_table_offset;
 };
 
+struct cq_entry {
+	/* DW 0-1 */
+	__le64 command_desc_base_addr;
+
+	/* DW 2 */
+	__le16  response_upiu_length;
+	__le16  response_upiu_offset;
+
+	/* DW 3 */
+	__le16  prd_table_length;
+	__le16  prd_table_offset;
+
+	/* DW 4 */
+	__le32 status;
+
+	/* DW 5-7 */
+	u32 reserved[3];
+};
+
+static_assert(sizeof(struct cq_entry) == 32);
+
 /*
  * UTMRD structure.
  */
-- 
2.7.4

Re: [PATCH v3 08/17] ufs: core: mcq: Allocate memory for mcq mode

[Bart Van Assche]

On 10/20/22 11:03, Asutosh Das wrote:
>   int ufshcd_mcq_init(struct ufs_hba *hba)
>   {
> -	int ret;
> +	int ret, i;
> +	struct ufs_hw_queue *hwq;

Although this is not a strict rule, most kernel developers these days 
order declarations from longer to shorter ("reverse Christmas tree").

> +	/* The very first HW queue is to serve device command */

is to serve -> serves
command -> commands

Otherwise this patch looks good to me.

Thanks,

Bart.

RE: [PATCH v3 08/17] ufs: core: mcq: Allocate memory for mcq mode

[Avri Altman]

>  #define SD_ASCII_STD true
>  #define SD_RAW false
> diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
> index b928ed8..e32396e 100644
> --- a/drivers/ufs/core/ufshcd.c
> +++ b/drivers/ufs/core/ufshcd.c
> @@ -3686,6 +3686,12 @@ static int ufshcd_memory_alloc(struct ufs_hba
> *hba)
>         }
> 
>         /*
> +        * Not freed if MCQ is configured see ufshcd_release_sdb_queue() and
> +        * ufshcd_config_mcq()
> +        */
> +       if (hba->utmrdl_base_addr)
> +               goto skip_utmrdl;
> +       /*
>          * Allocate memory for UTP Task Management descriptors
>          * UFSHCI requires 1024 byte alignment of UTMRD
>          */
> @@ -3701,6 +3707,7 @@ static int ufshcd_memory_alloc(struct ufs_hba
> *hba)
>                 goto out;
>         }
> 
> +skip_utmrdl:
>         /* Allocate memory for local reference block */
>         hba->lrb = devm_kcalloc(hba->dev,
>                                 hba->nutrs, sizeof(struct ufshcd_lrb),
> @@ -8176,6 +8183,22 @@ static int ufshcd_add_lus(struct ufs_hba *hba)
>         return ret;
>  }
> 
> +/* SDB - Single Doorbell */
> +static void ufshcd_release_sdb_queue(struct ufs_hba *hba, int nutrs)
> +{
> +       size_t ucdl_size, utrdl_size;
> +
> +       ucdl_size = sizeof(struct utp_transfer_cmd_desc) * nutrs;
> +       dmam_free_coherent(hba->dev, ucdl_size, hba->ucdl_base_addr,
> +                          hba->ucdl_dma_addr);
> +
> +       utrdl_size = sizeof(struct utp_transfer_req_desc) * nutrs;
> +       dmam_free_coherent(hba->dev, utrdl_size, hba->utrdl_base_addr,
> +                          hba->utrdl_dma_addr);
> +
> +       devm_kfree(hba->dev, hba->lrb);
Is it possible not to release the lrb here?
and then you won't be needing to call ufshcd_memory_alloc again?

Thanks,
Avri

> +}
> +
>  static int ufshcd_alloc_mcq(struct ufs_hba *hba)
>  {
>         int ret;
> @@ -8183,12 +8206,25 @@ static int ufshcd_alloc_mcq(struct ufs_hba
> *hba)
> 
>         hba->nutrs = ufshcd_mcq_decide_queue_depth(hba);
>         ret = ufshcd_mcq_init(hba);
> -       if (ret) {
> -               hba->nutrs = old_nutrs;
> -               return ret;
> +       if (ret)
> +               goto err;
> +
> +       if (hba->nutrs != old_nutrs) {
> +               ufshcd_release_sdb_queue(hba, old_nutrs);
> +               ret = ufshcd_memory_alloc(hba);
> +               if (ret)
> +                       goto err;
> +               ufshcd_host_memory_configure(hba);
>         }
> 
> +       ret = ufshcd_mcq_memory_alloc(hba);
> +       if (ret)
> +               goto err;
> +
>         return 0;
> +err:
> +       hba->nutrs = old_nutrs;
> +       return ret;
>  }

Re: [PATCH v3 08/17] ufs: core: mcq: Allocate memory for mcq mode

[Asutosh Das]

On Sun, Oct 30 2022 at 05:28 -0700, Avri Altman wrote:
[...]

>> +/* SDB - Single Doorbell */
>> +static void ufshcd_release_sdb_queue(struct ufs_hba *hba, int nutrs)
>> +{
>> +       size_t ucdl_size, utrdl_size;
>> +
>> +       ucdl_size = sizeof(struct utp_transfer_cmd_desc) * nutrs;
>> +       dmam_free_coherent(hba->dev, ucdl_size, hba->ucdl_base_addr,
>> +                          hba->ucdl_dma_addr);
>> +
>> +       utrdl_size = sizeof(struct utp_transfer_req_desc) * nutrs;
>> +       dmam_free_coherent(hba->dev, utrdl_size, hba->utrdl_base_addr,
>> +                          hba->utrdl_dma_addr);
>> +
>> +       devm_kfree(hba->dev, hba->lrb);
>Is it possible not to release the lrb here?
>and then you won't be needing to call ufshcd_memory_alloc again?
>
The hba->nutrs may have changed so number of lrb's may increase as well.
So a reallocation is needed, I think.

-asd

[PATCH v3 09/17] ufs: core: mcq: Configure operation and runtime interface

[Asutosh Das]

Runtime and operation registers are defined per Submission
and Completion queue.
The location of these registers is not defined in the spec;
meaning the offsets and stride may vary for different
HC vendors. Establish the stride, base address and doorbell
address offsets from vendor host driver and program it.

Co-developed-by: Can Guo <quic_cang@quicinc.com>
Signed-off-by: Can Guo <quic_cang@quicinc.com>
Signed-off-by: Asutosh Das <quic_asutoshd@quicinc.com>
---
 drivers/ufs/core/ufs-mcq.c     | 102 +++++++++++++++++++++++++++++++++++++++++
 drivers/ufs/core/ufshcd-priv.h |  11 +++++
 drivers/ufs/core/ufshcd.c      |  23 ++++++++++
 drivers/ufs/host/ufs-qcom.c    |  24 ++++++++++
 include/ufs/ufshcd.h           |  52 +++++++++++++++++++++
 include/ufs/ufshci.h           |  31 +++++++++++++
 6 files changed, 243 insertions(+)

diff --git a/drivers/ufs/core/ufs-mcq.c b/drivers/ufs/core/ufs-mcq.c
index 14d808a..213e398 100644
--- a/drivers/ufs/core/ufs-mcq.c
+++ b/drivers/ufs/core/ufs-mcq.c
@@ -17,6 +17,8 @@
 #define UFS_MCQ_MIN_READ_QUEUES 0
 #define UFS_MCQ_NUM_DEV_CMD_QUEUES 1
 #define UFS_MCQ_MIN_POLL_QUEUES 0
+#define QUEUE_EN_OFFSET 31
+#define QUEUE_ID_OFFSET 16
 
 #define MAX_DEV_CMD_ENTRIES	2
 #define MCQ_CFG_MAC_MASK	GENMASK(16, 8)
@@ -25,6 +27,7 @@
 #define MCQ_SQATTR_OFFSET(c) \
 	((((c) >> 16) & MCQ_QCFGPTR_MASK) * MCQ_QCFGPTR_UNIT)
 #define MCQ_QCFG_SIZE	0x40
+#define MCQ_ENTRY_SIZE_IN_DWORD	8
 
 static int rw_queue_count_set(const char *val, const struct kernel_param *kp)
 {
@@ -122,6 +125,24 @@ u32 ufshcd_mcq_decide_queue_depth(struct ufs_hba *hba)
 	return qd;
 }
 
+/**
+ * ufshcd_mcq_config_mac - Set the #Max Activ Cmds.
+ * @hba - per adpater instance
+ * @max_active_cmds - maximum # of active commands to the device at any time.
+ *
+ * The controller wouldn't send more than the max_active_cmds to the device at
+ * any time.
+ */
+void ufshcd_mcq_config_mac(struct ufs_hba *hba, u32 max_active_cmds)
+{
+	u32 val;
+
+	val = ufshcd_readl(hba, REG_UFS_MCQ_CFG);
+	val &= ~MCQ_CFG_MAC_MASK;
+	val |= FIELD_PREP(MCQ_CFG_MAC_MASK, max_active_cmds);
+	ufshcd_writel(hba, val, REG_UFS_MCQ_CFG);
+}
+
 static int ufshcd_mcq_config_resource(struct ufs_hba *hba)
 {
 	struct platform_device *pdev = to_platform_device(hba->dev);
@@ -267,6 +288,81 @@ int ufshcd_mcq_memory_alloc(struct ufs_hba *hba)
 	return 0;
 }
 
+/* Operation and runtime registers configuration */
+#define MCQ_CFG_n(r, i) \
+	((r) + MCQ_QCFG_SIZE * (i))
+#define MCQ_OPR_OFFSET_n(p, i) \
+	(hba->mcq_opr[(p)].offset + hba->mcq_opr[(p)].stride * (i))
+
+static void __iomem *mcq_opr_base(struct ufs_hba *hba,
+					 enum ufshcd_mcq_opr n, int i)
+{
+	struct ufshcd_mcq_opr_info_t *opr = &hba->mcq_opr[n];
+
+	return opr->base + opr->stride * i;
+}
+
+void ufshcd_mcq_make_queues_operational(struct ufs_hba *hba)
+{
+	struct ufs_hw_queue *hwq;
+	u16 qsize;
+	int i;
+
+	for (i = 0; i < hba->nr_hw_queues; i++) {
+		hwq = &hba->uhq[i];
+		hwq->id = i;
+		qsize = hwq->max_entries * MCQ_ENTRY_SIZE_IN_DWORD - 1;
+
+		/* Submission Queue Lower Base Address */
+		ufsmcq_writelx(hba, lower_32_bits(hwq->sqe_dma_addr),
+			      MCQ_CFG_n(REG_SQLBA, i));
+		/* Submission Queue Upper Base Address */
+		ufsmcq_writelx(hba, upper_32_bits(hwq->sqe_dma_addr),
+			      MCQ_CFG_n(REG_SQUBA, i));
+		/* Submission Queue Doorbell Address Offset */
+		ufsmcq_writelx(hba, MCQ_OPR_OFFSET_n(OPR_SQD, i),
+			      MCQ_CFG_n(REG_SQDAO, i));
+		/* Submission Queue Interrupt Status Address Offset */
+		ufsmcq_writelx(hba, MCQ_OPR_OFFSET_n(OPR_SQIS, i),
+			      MCQ_CFG_n(REG_SQISAO, i));
+
+		/* Completion Queue Lower Base Address */
+		ufsmcq_writelx(hba, lower_32_bits(hwq->cqe_dma_addr),
+			      MCQ_CFG_n(REG_CQLBA, i));
+		/* Completion Queue Upper Base Address */
+		ufsmcq_writelx(hba, upper_32_bits(hwq->cqe_dma_addr),
+			      MCQ_CFG_n(REG_CQUBA, i));
+		/* Completion Queue Doorbell Address Offset */
+		ufsmcq_writelx(hba, MCQ_OPR_OFFSET_n(OPR_CQD, i),
+			      MCQ_CFG_n(REG_CQDAO, i));
+		/* Completion Queue Interrupt Status Address Offset */
+		ufsmcq_writelx(hba, MCQ_OPR_OFFSET_n(OPR_CQIS, i),
+			      MCQ_CFG_n(REG_CQISAO, i));
+
+		/* Save the base addresses for quicker access */
+		hwq->mcq_sq_head = mcq_opr_base(hba, OPR_SQD, i) + REG_SQHP;
+		hwq->mcq_sq_tail = mcq_opr_base(hba, OPR_SQD, i) + REG_SQTP;
+		hwq->mcq_cq_head = mcq_opr_base(hba, OPR_CQD, i) + REG_CQHP;
+		hwq->mcq_cq_tail = mcq_opr_base(hba, OPR_CQD, i) + REG_CQTP;
+
+		/* Enable Tail Entry Push Status interrupt only for non-poll queues */
+		if (i < hba->nr_hw_queues - hba->nr_queues[HCTX_TYPE_POLL])
+			writel(1, mcq_opr_base(hba, OPR_CQIS, i) + REG_CQIE);
+
+		/* Completion Queue Enable|Size to Completion Queue Attribute */
+		ufsmcq_writel(hba, (1 << QUEUE_EN_OFFSET) | qsize,
+			      MCQ_CFG_n(REG_CQATTR, i));
+
+		/*
+		 * Submission Qeueue Enable|Size|Completion Queue ID to
+		 * Submission Queue Attribute
+		 */
+		ufsmcq_writel(hba, (1 << QUEUE_EN_OFFSET) | qsize |
+			      (i << QUEUE_ID_OFFSET),
+			      MCQ_CFG_n(REG_SQATTR, i));
+	}
+}
+
 int ufshcd_mcq_init(struct ufs_hba *hba)
 {
 	int ret, i;
@@ -280,6 +376,12 @@ int ufshcd_mcq_init(struct ufs_hba *hba)
 	if (ret)
 		return ret;
 
+	ret = ufshcd_mcq_vops_op_runtime_config(hba);
+	if (ret) {
+		dev_err(hba->dev, "Operation runtime config failed, ret=%d\n",
+			ret);
+		return ret;
+	}
 	hba->uhq = devm_kzalloc(hba->dev,
 				hba->nr_hw_queues * sizeof(struct ufs_hw_queue),
 				GFP_KERNEL);
diff --git a/drivers/ufs/core/ufshcd-priv.h b/drivers/ufs/core/ufshcd-priv.h
index f624682..01026e3 100644
--- a/drivers/ufs/core/ufshcd-priv.h
+++ b/drivers/ufs/core/ufshcd-priv.h
@@ -53,6 +53,9 @@ void ufshcd_auto_hibern8_update(struct ufs_hba *hba, u32 ahit);
 int ufshcd_mcq_init(struct ufs_hba *hba);
 u32 ufshcd_mcq_decide_queue_depth(struct ufs_hba *hba);
 int ufshcd_mcq_memory_alloc(struct ufs_hba *hba);
+void ufshcd_mcq_make_queues_operational(struct ufs_hba *hba);
+void ufshcd_mcq_config_mac(struct ufs_hba *hba, u32 max_active_cmds);
+void ufshcd_mcq_select_mcq_mode(struct ufs_hba *hba);
 
 #define SD_ASCII_STD true
 #define SD_RAW false
@@ -226,6 +229,14 @@ static inline int ufshcd_mcq_vops_get_hba_mac(struct ufs_hba *hba)
 	return -EOPNOTSUPP;
 }
 
+static inline int ufshcd_mcq_vops_op_runtime_config(struct ufs_hba *hba)
+{
+	if (hba->vops && hba->vops->op_runtime_config)
+		return hba->vops->op_runtime_config(hba);
+
+	return -EOPNOTSUPP;
+}
+
 extern const struct ufs_pm_lvl_states ufs_pm_lvl_states[];
 
 /**
diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index e32396e..b254dc5 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -42,6 +42,12 @@
 #define UFSHCD_ENABLE_INTRS	(UTP_TRANSFER_REQ_COMPL |\
 				 UTP_TASK_REQ_COMPL |\
 				 UFSHCD_ERROR_MASK)
+
+#define UFSHCD_ENABLE_MCQ_INTRS	(UTP_TASK_REQ_COMPL |\
+				 UFSHCD_ERROR_MASK |\
+				 MCQ_CQ_EVENT_STATUS)
+
+
 /* UIC command timeout, unit: ms */
 #define UIC_CMD_TIMEOUT	500
 
@@ -8227,6 +8233,20 @@ static int ufshcd_alloc_mcq(struct ufs_hba *hba)
 	return ret;
 }
 
+static void ufshcd_config_mcq(struct ufs_hba *hba)
+{
+	ufshcd_enable_intr(hba, UFSHCD_ENABLE_MCQ_INTRS);
+	ufshcd_mcq_make_queues_operational(hba);
+	ufshcd_mcq_config_mac(hba, hba->nutrs);
+
+	hba->host->can_queue = hba->nutrs - UFSHCD_NUM_RESERVED;
+	hba->reserved_slot = hba->nutrs - UFSHCD_NUM_RESERVED;
+	dev_info(hba->dev, "MCQ configured, nr_queues=%d, io_queues=%d, read_queue=%d, poll_queues=%d, queue_depth=%d\n",
+		 hba->nr_hw_queues, hba->nr_queues[HCTX_TYPE_DEFAULT],
+		 hba->nr_queues[HCTX_TYPE_READ], hba->nr_queues[HCTX_TYPE_POLL],
+		 hba->nutrs);
+}
+
 /**
  * ufshcd_probe_hba - probe hba to detect device and initialize it
  * @hba: per-adapter instance
@@ -8287,6 +8307,9 @@ static int ufshcd_probe_hba(struct ufs_hba *hba, bool init_dev_params)
 		}
 	}
 
+	if (is_mcq_supported(hba))
+		ufshcd_config_mcq(hba);
+
 	ufshcd_tune_unipro_params(hba);
 
 	/* UFS device is also active now */
diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
index 5dc824f..59e892c 100644
--- a/drivers/ufs/host/ufs-qcom.c
+++ b/drivers/ufs/host/ufs-qcom.c
@@ -1425,6 +1425,29 @@ static void ufs_qcom_config_scaling_param(struct ufs_hba *hba,
 }
 #endif
 
+static int ufs_qcom_op_runtime_config(struct ufs_hba *hba)
+{
+	struct ufshcd_mcq_opr_info_t *opr;
+	struct ufshcd_res_info *mem_res, *sqdao_res;
+	int i;
+
+	mem_res = &hba->res[RES_UFS];
+	sqdao_res = &hba->res[RES_MCQ_SQD];
+
+	if (!mem_res->base || !sqdao_res->base)
+		return -EINVAL;
+
+	for (i = 0; i < OPR_MAX; i++) {
+		opr = &hba->mcq_opr[i];
+		opr->offset = sqdao_res->resource->start -
+			      mem_res->resource->start + 0x40 * i;
+		opr->stride = 0x100;
+		opr->base = sqdao_res->base + 0x40 * i;
+	}
+
+	return 0;
+}
+
 static int ufs_qcom_get_hba_mac(struct ufs_hba *hba)
 {
 	/* Default is 32, but Qualcomm HC supports upto 64 */
@@ -1455,6 +1478,7 @@ static const struct ufs_hba_variant_ops ufs_hba_qcom_vops = {
 	.config_scaling_param = ufs_qcom_config_scaling_param,
 	.program_key		= ufs_qcom_ice_program_key,
 	.get_hba_mac		= ufs_qcom_get_hba_mac,
+	.op_runtime_config	= ufs_qcom_op_runtime_config,
 };
 
 /**
diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h
index f2cea1e..511f1dc 100644
--- a/include/ufs/ufshcd.h
+++ b/include/ufs/ufshcd.h
@@ -294,6 +294,7 @@ struct ufs_pwr_mode_info {
  * @program_key: program or evict an inline encryption key
  * @event_notify: called to notify important events
  * @get_hba_mac: called to get vendor specific mac value
+ * @op_runtime_config: called to config Operation and runtime regs Pointers
  */
 struct ufs_hba_variant_ops {
 	const char *name;
@@ -333,6 +334,7 @@ struct ufs_hba_variant_ops {
 	void	(*event_notify)(struct ufs_hba *hba,
 				enum ufs_event_type evt, void *data);
 	int	(*get_hba_mac)(struct ufs_hba *hba);
+	int	(*op_runtime_config)(struct ufs_hba *hba);
 };
 
 /* clock gating state  */
@@ -746,6 +748,27 @@ enum ufshcd_res {
 };
 
 /**
+ * struct ufshcd_mcq_opr_info_t - Operation and Runtime registers
+ *
+ * @offset: Doorbell Address Offset
+ * @stride: Steps proportional to queue [0...31]
+ * @base: base address
+ */
+struct ufshcd_mcq_opr_info_t {
+	unsigned long offset;
+	unsigned long stride;
+	void __iomem *base;
+};
+
+enum ufshcd_mcq_opr {
+	OPR_SQD,
+	OPR_SQIS,
+	OPR_CQD,
+	OPR_CQIS,
+	OPR_MAX,
+};
+
+/**
  * struct ufs_hba - per adapter private structure
  * @mmio_base: UFSHCI base register address
  * @ucdl_base_addr: UFS Command Descriptor base address
@@ -853,6 +876,7 @@ enum ufshcd_res {
  *	ufshcd_resume_complete()
  * @ext_iid_sup: is EXT_IID is supported by UFSHC
  * @mcq_sup: is mcq supported by UFSHC
+ * @mcq_enabled: is mcq ready to accept requests
  * @nr_hw_queues: number of hardware queues configured
  * @nr_queues: number of Queues of different queue types
  * @res: array of resource info of MCQ registers
@@ -1009,29 +1033,47 @@ struct ufs_hba {
 	bool complete_put;
 	bool ext_iid_sup;
 	bool mcq_sup;
+	bool mcq_enabled;
 	unsigned int nr_hw_queues;
 	unsigned int nr_queues[HCTX_MAX_TYPES];
 	struct ufshcd_res_info res[RES_MAX];
 	void __iomem *mcq_base;
 	struct ufs_hw_queue *uhq;
 	struct ufs_hw_queue *dev_cmd_queue;
+	struct ufshcd_mcq_opr_info_t mcq_opr[OPR_MAX];
 };
 
 /**
+ * @mcq_sq_head: base address of submission queue head pointer
+ * @mcq_sq_tail: base address of submission queue tail pointer
+ * @mcq_cq_head: base address of completion queue head pointer
+ * @mcq_cq_tail: base address of completion queue tail pointer
  * @sqe_base_addr: submission queue entry base address
  * @sqe_dma_addr: submission queue dma address
  * @cqe_base_addr: completion queue base address
  * @cqe_dma_addr: completion queue dma address
  * @max_entries: max number of slots in this hardware queue
+ * @id: hardware queue ID
  */
 struct ufs_hw_queue {
+	void __iomem *mcq_sq_head;
+	void __iomem *mcq_sq_tail;
+	void __iomem *mcq_cq_head;
+	void __iomem *mcq_cq_tail;
+
 	void *sqe_base_addr;
 	dma_addr_t sqe_dma_addr;
 	struct cq_entry *cqe_base_addr;
 	dma_addr_t cqe_dma_addr;
 	u32 max_entries;
+	u32 id;
 };
 
+static inline bool is_mcq_enabled(struct ufs_hba *hba)
+{
+	return hba->mcq_enabled;
+}
+
 static inline bool is_mcq_supported(struct ufs_hba *hba)
 {
 	return hba->mcq_sup && (hba->caps & UFSHCD_CAP_MCQ_EN);
@@ -1087,6 +1129,16 @@ static inline bool ufshcd_is_wb_allowed(struct ufs_hba *hba)
 	return hba->caps & UFSHCD_CAP_WB_EN;
 }
 
+#define ufsmcq_writel(hba, val, reg)	\
+	writel((val), (hba)->mcq_base + (reg))
+#define ufsmcq_readl(hba, reg)	\
+	readl((hba)->mcq_base + (reg))
+
+#define ufsmcq_writelx(hba, val, reg)	\
+	writel_relaxed((val), (hba)->mcq_base + (reg))
+#define ufsmcq_readlx(hba, reg)	\
+	readl_relaxed((hba)->mcq_base + (reg))
+
 #define ufshcd_writel(hba, val, reg)	\
 	writel((val), (hba)->mmio_base + (reg))
 #define ufshcd_readl(hba, reg)	\
diff --git a/include/ufs/ufshci.h b/include/ufs/ufshci.h
index 7fa8faf..3d455e1 100644
--- a/include/ufs/ufshci.h
+++ b/include/ufs/ufshci.h
@@ -57,6 +57,7 @@ enum {
 	REG_UFS_CCAP				= 0x100,
 	REG_UFS_CRYPTOCAP			= 0x104,
 
+	REG_UFS_MEM_CFG				= 0x300,
 	REG_UFS_MCQ_CFG				= 0x380,
 	UFSHCI_CRYPTO_REG_SPACE_SIZE		= 0x400,
 };
@@ -78,6 +79,35 @@ enum {
 	MASK_EXT_IID_SUPPORT = 0x00000400,
 };
 
+enum {
+	REG_SQATTR		= 0x0,
+	REG_SQLBA		= 0x4,
+	REG_SQUBA		= 0x8,
+	REG_SQDAO		= 0xC,
+	REG_SQISAO		= 0x10,
+
+	REG_CQATTR		= 0x20,
+	REG_CQLBA		= 0x24,
+	REG_CQUBA		= 0x28,
+	REG_CQDAO		= 0x2C,
+	REG_CQISAO		= 0x30,
+};
+
+enum {
+	REG_SQHP		= 0x0,
+	REG_SQTP		= 0x4,
+};
+
+enum {
+	REG_CQHP		= 0x0,
+	REG_CQTP		= 0x4,
+};
+
+enum {
+	REG_CQIS		= 0x0,
+	REG_CQIE		= 0x4,
+};
+
 #define UFS_MASK(mask, offset)		((mask) << (offset))
 
 /* UFS Version 08h */
@@ -134,6 +164,7 @@ static inline u32 ufshci_version(u32 major, u32 minor)
 #define CONTROLLER_FATAL_ERROR			0x10000
 #define SYSTEM_BUS_FATAL_ERROR			0x20000
 #define CRYPTO_ENGINE_FATAL_ERROR		0x40000
+#define MCQ_CQ_EVENT_STATUS			0x100000
 
 #define UFSHCD_UIC_HIBERN8_MASK	(UIC_HIBERNATE_ENTER |\
 				UIC_HIBERNATE_EXIT)
-- 
2.7.4

Re: [PATCH v3 09/17] ufs: core: mcq: Configure operation and runtime interface

[Bart Van Assche]

On 10/20/22 11:03, Asutosh Das wrote:
> +/**
> + * ufshcd_mcq_config_mac - Set the #Max Activ Cmds.
> + * @hba - per adpater instance

adpater -> adapter

> + * @max_active_cmds - maximum # of active commands to the device at any time.
> + *
> + * The controller wouldn't send more than the max_active_cmds to the device at
> + * any time.
> + */

wouldn't -> won't

> +#define MCQ_CFG_n(r, i) \
> +	((r) + MCQ_QCFG_SIZE * (i))

No need to spread this macro over two lines.

Otherwise this patch looks good to me.

Bart.

[PATCH v3 10/17] ufs: core: mcq: Use shared tags for MCQ mode

[Asutosh Das]

Enable shared taggs for MCQ. For UFS, this should
not have a huge performance impact. It however
simplifies the MCQ implementation and reuses most of
the existing code in the issue and completion path.
Also add multiple queue mapping to map_queue().

Co-developed-by: Can Guo <quic_cang@quicinc.com>
Signed-off-by: Can Guo <quic_cang@quicinc.com>
Signed-off-by: Asutosh Das <quic_asutoshd@quicinc.com>
---
 drivers/ufs/core/ufs-mcq.c |  2 ++
 drivers/ufs/core/ufshcd.c  | 31 +++++++++++++++++--------------
 2 files changed, 19 insertions(+), 14 deletions(-)

diff --git a/drivers/ufs/core/ufs-mcq.c b/drivers/ufs/core/ufs-mcq.c
index 213e398..10a50eb 100644
--- a/drivers/ufs/core/ufs-mcq.c
+++ b/drivers/ufs/core/ufs-mcq.c
@@ -367,6 +367,7 @@ int ufshcd_mcq_init(struct ufs_hba *hba)
 {
 	int ret, i;
 	struct ufs_hw_queue *hwq;
+	struct Scsi_Host *host = hba->host;
 
 	ret = ufshcd_mcq_config_nr_queues(hba);
 	if (ret)
@@ -400,6 +401,7 @@ int ufshcd_mcq_init(struct ufs_hba *hba)
 	/* Give dev_cmd_queue the minimal number of entries */
 	hba->dev_cmd_queue->max_entries = MAX_DEV_CMD_ENTRIES;
 
+	host->host_tagset = 1;
 	return 0;
 }
 
diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index b254dc5..87201dd 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -2728,25 +2728,28 @@ static inline bool is_device_wlun(struct scsi_device *sdev)
  */
 static int ufshcd_map_queues(struct Scsi_Host *shost)
 {
-	int i, ret;
+	int i, queue_offset = 0;
+	struct ufs_hba *hba = shost_priv(shost);
+
+	if (!is_mcq_supported(hba)) {
+		hba->nr_queues[HCTX_TYPE_DEFAULT] = 1;
+		hba->nr_queues[HCTX_TYPE_READ] = 0;
+		hba->nr_queues[HCTX_TYPE_POLL] = 1;
+		hba->nr_hw_queues = 1;
+	}
 
 	for (i = 0; i < shost->nr_maps; i++) {
 		struct blk_mq_queue_map *map = &shost->tag_set.map[i];
 
-		switch (i) {
-		case HCTX_TYPE_DEFAULT:
-		case HCTX_TYPE_POLL:
-			map->nr_queues = 1;
-			break;
-		case HCTX_TYPE_READ:
-			map->nr_queues = 0;
+		map->nr_queues = hba->nr_queues[i];
+		if (!map->nr_queues)
 			continue;
-		default:
-			WARN_ON_ONCE(true);
-		}
-		map->queue_offset = 0;
-		ret = blk_mq_map_queues(map);
-		WARN_ON_ONCE(ret);
+		map->queue_offset = queue_offset;
+		if (i == HCTX_TYPE_POLL && !is_mcq_supported(hba))
+			map->queue_offset = 0;
+
+		blk_mq_map_queues(map);
+		queue_offset += map->nr_queues;
 	}
 
 	return 0;
-- 
2.7.4

Re: [PATCH v3 10/17] ufs: core: mcq: Use shared tags for MCQ mode

[Bart Van Assche]

On 10/20/22 11:03, Asutosh Das wrote:
> Enable shared taggs for MCQ. For UFS, this should

taggs -> tags

Otherwise this patch looks good to me. Hence:

Reviewed-by: Bart Van Assche <bvanassche@acm.org>

RE: [PATCH v3 10/17] ufs: core: mcq: Use shared tags for MCQ mode

[Avri Altman]

>  static int ufshcd_map_queues(struct Scsi_Host *shost)
This seems like an old version of ufshcd_map_queues - returns void now.
Needs rebase?

>  {
> -       int i, ret;
> +       int i, queue_offset = 0;
> +       struct ufs_hba *hba = shost_priv(shost);
> +
> +       if (!is_mcq_supported(hba)) {
> +               hba->nr_queues[HCTX_TYPE_DEFAULT] = 1;
> +               hba->nr_queues[HCTX_TYPE_READ] = 0;
> +               hba->nr_queues[HCTX_TYPE_POLL] = 1;
> +               hba->nr_hw_queues = 1;
> +       }
> 
>         for (i = 0; i < shost->nr_maps; i++) {
>                 struct blk_mq_queue_map *map = &shost->tag_set.map[i];
> 
> -               switch (i) {
> -               case HCTX_TYPE_DEFAULT:
> -               case HCTX_TYPE_POLL:
> -                       map->nr_queues = 1;
> -                       break;
> -               case HCTX_TYPE_READ:
> -                       map->nr_queues = 0;
> +               map->nr_queues = hba->nr_queues[i];
> +               if (!map->nr_queues)
>                         continue;
> -               default:
> -                       WARN_ON_ONCE(true);
> -               }
> -               map->queue_offset = 0;
> -               ret = blk_mq_map_queues(map);
Ditto.

Thanks,
Avri

> -               WARN_ON_ONCE(ret);
> +               map->queue_offset = queue_offset;
> +               if (i == HCTX_TYPE_POLL && !is_mcq_supported(hba))
> +                       map->queue_offset = 0;
> +
> +               blk_mq_map_queues(map);
> +               queue_offset += map->nr_queues;
>         }
> 
>         return 0;
> --
> 2.7.4

Re: [PATCH v3 10/17] ufs: core: mcq: Use shared tags for MCQ mode

[Bart Van Assche]

On 10/30/22 06:06, Avri Altman wrote:
>>   static int ufshcd_map_queues(struct Scsi_Host *shost)
> This seems like an old version of ufshcd_map_queues - returns void now.
> Needs rebase?

Hi Asutosh,

Please use the for-next branch of 
https://git.kernel.org/pub/scm/linux/kernel/git/mkp/scsi.git/ when 
preparing SCSI patches for the next merge window.

Thanks,

Bart.

[PATCH v3 11/17] ufs: core: Prepare ufshcd_send_command for mcq

[Asutosh Das]

Add support to send commands using multiple submission
queues in MCQ mode.
Modify the functions that use ufshcd_send_command().

Co-developed-by: Can Guo <quic_cang@quicinc.com>
Signed-off-by: Can Guo <quic_cang@quicinc.com>
Signed-off-by: Asutosh Das <quic_asutoshd@quicinc.com>
---
 drivers/ufs/core/ufs-mcq.c     |  1 +
 drivers/ufs/core/ufshcd-priv.h | 10 ++++++++++
 drivers/ufs/core/ufshcd.c      | 36 ++++++++++++++++++++++++++----------
 include/ufs/ufshcd.h           |  5 +++++
 4 files changed, 42 insertions(+), 10 deletions(-)

diff --git a/drivers/ufs/core/ufs-mcq.c b/drivers/ufs/core/ufs-mcq.c
index 10a50eb..aed6272 100644
--- a/drivers/ufs/core/ufs-mcq.c
+++ b/drivers/ufs/core/ufs-mcq.c
@@ -394,6 +394,7 @@ int ufshcd_mcq_init(struct ufs_hba *hba)
 	for (i = 0; i < hba->nr_hw_queues; i++) {
 		hwq = &hba->uhq[i];
 		hwq->max_entries = hba->nutrs;
+		spin_lock_init(&hwq->sq_lock);
 	}
 
 	/* The very first HW queue is to serve device command */
diff --git a/drivers/ufs/core/ufshcd-priv.h b/drivers/ufs/core/ufshcd-priv.h
index 01026e3..7df2d92 100644
--- a/drivers/ufs/core/ufshcd-priv.h
+++ b/drivers/ufs/core/ufshcd-priv.h
@@ -317,4 +317,14 @@ static inline bool ufs_is_valid_unit_desc_lun(struct ufs_dev_info *dev_info,
 	return lun == UFS_UPIU_RPMB_WLUN || (lun < dev_info->max_lu_supported);
 }
 
+static inline void ufshcd_inc_sq_tail(struct ufs_hw_queue *q)
+{
+	u32 mask = q->max_entries - 1;
+	u32 val;
+
+	q->sq_tail_slot = (q->sq_tail_slot + 1) & mask;
+	val = q->sq_tail_slot * sizeof(struct utp_transfer_req_desc);
+	writel(val, q->mcq_sq_tail);
+}
+
 #endif /* _UFSHCD_PRIV_H_ */
diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index 87201dd..ba19e12 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -2149,9 +2149,11 @@ static void ufshcd_update_monitor(struct ufs_hba *hba, const struct ufshcd_lrb *
  * ufshcd_send_command - Send SCSI or device management commands
  * @hba: per adapter instance
  * @task_tag: Task tag of the command
+ * @hwq: pointer to hardware queue instance
  */
 static inline
-void ufshcd_send_command(struct ufs_hba *hba, unsigned int task_tag)
+void ufshcd_send_command(struct ufs_hba *hba, unsigned int task_tag,
+			 struct ufs_hw_queue *hwq)
 {
 	struct ufshcd_lrb *lrbp = &hba->lrb[task_tag];
 	unsigned long flags;
@@ -2163,12 +2165,24 @@ void ufshcd_send_command(struct ufs_hba *hba, unsigned int task_tag)
 	if (unlikely(ufshcd_should_inform_monitor(hba, lrbp)))
 		ufshcd_start_monitor(hba, lrbp);
 
-	spin_lock_irqsave(&hba->outstanding_lock, flags);
-	if (hba->vops && hba->vops->setup_xfer_req)
-		hba->vops->setup_xfer_req(hba, task_tag, !!lrbp->cmd);
-	__set_bit(task_tag, &hba->outstanding_reqs);
-	ufshcd_writel(hba, 1 << task_tag, REG_UTP_TRANSFER_REQ_DOOR_BELL);
-	spin_unlock_irqrestore(&hba->outstanding_lock, flags);
+	if (is_mcq_enabled(hba)) {
+		int utrd_size = sizeof(struct utp_transfer_req_desc);
+
+		spin_lock(&hwq->sq_lock);
+		memcpy(hwq->sqe_base_addr + (hwq->sq_tail_slot * utrd_size),
+		       lrbp->utr_descriptor_ptr, utrd_size);
+		ufshcd_inc_sq_tail(hwq);
+		spin_unlock(&hwq->sq_lock);
+	} else {
+		spin_lock_irqsave(&hba->outstanding_lock, flags);
+		if (hba->vops && hba->vops->setup_xfer_req)
+			hba->vops->setup_xfer_req(hba, lrbp->task_tag,
+						  !!lrbp->cmd);
+		__set_bit(lrbp->task_tag, &hba->outstanding_reqs);
+		ufshcd_writel(hba, 1 << lrbp->task_tag,
+			      REG_UTP_TRANSFER_REQ_DOOR_BELL);
+		spin_unlock_irqrestore(&hba->outstanding_lock, flags);
+	}
 }
 
 /**
@@ -2789,6 +2803,7 @@ static int ufshcd_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd)
 	int tag = scsi_cmd_to_rq(cmd)->tag;
 	struct ufshcd_lrb *lrbp;
 	int err = 0;
+	struct ufs_hw_queue *hwq = NULL;
 
 	WARN_ONCE(tag < 0 || tag >= hba->nutrs, "Invalid tag %d\n", tag);
 
@@ -2873,7 +2888,7 @@ static int ufshcd_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd)
 		goto out;
 	}
 
-	ufshcd_send_command(hba, tag);
+	ufshcd_send_command(hba, tag, hwq);
 
 out:
 	rcu_read_unlock();
@@ -3046,10 +3061,11 @@ static int ufshcd_exec_dev_cmd(struct ufs_hba *hba,
 		goto out;
 
 	hba->dev_cmd.complete = &wait;
+	hba->dev_cmd.cqe = NULL;
 
 	ufshcd_add_query_upiu_trace(hba, UFS_QUERY_SEND, lrbp->ucd_req_ptr);
 
-	ufshcd_send_command(hba, tag);
+	ufshcd_send_command(hba, tag, hba->dev_cmd_queue);
 	err = ufshcd_wait_for_dev_cmd(hba, lrbp, timeout);
 	ufshcd_add_query_upiu_trace(hba, err ? UFS_QUERY_ERR : UFS_QUERY_COMP,
 				    (struct utp_upiu_req *)lrbp->ucd_rsp_ptr);
@@ -6904,7 +6920,7 @@ static int ufshcd_issue_devman_upiu_cmd(struct ufs_hba *hba,
 
 	ufshcd_add_query_upiu_trace(hba, UFS_QUERY_SEND, lrbp->ucd_req_ptr);
 
-	ufshcd_send_command(hba, tag);
+	ufshcd_send_command(hba, tag, hba->dev_cmd_queue);
 	/*
 	 * ignore the returning value here - ufshcd_check_query_response is
 	 * bound to fail since dev_cmd.query and dev_cmd.type were left empty.
diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h
index 511f1dc..2c572ff 100644
--- a/include/ufs/ufshcd.h
+++ b/include/ufs/ufshcd.h
@@ -218,6 +218,7 @@ struct ufs_dev_cmd {
 	struct mutex lock;
 	struct completion *complete;
 	struct ufs_query query;
+	struct cq_entry *cqe;
 };
 
 /**
@@ -1054,6 +1055,8 @@ struct ufs_hba {
  * @cqe_dma_addr: completion queue dma address
  * @max_entries: max number of slots in this hardware queue
  * @id: hardware queue ID
+ * @sq_tp_slot: current slot to which SQ tail pointer is pointing
+ * @sq_lock: serialize submission queue access
  */
 struct ufs_hw_queue {
 	void __iomem *mcq_sq_head;
@@ -1067,6 +1070,8 @@ struct ufs_hw_queue {
 	dma_addr_t cqe_dma_addr;
 	u32 max_entries;
 	u32 id;
+	u32 sq_tail_slot;
+	spinlock_t sq_lock;
 };
 
 static inline bool is_mcq_enabled(struct ufs_hba *hba)
-- 
2.7.4

Re: [PATCH v3 11/17] ufs: core: Prepare ufshcd_send_command for mcq

[Bart Van Assche]

On 10/20/22 11:03, Asutosh Das wrote:
> Add support to send commands using multiple submission
> queues in MCQ mode.
> Modify the functions that use ufshcd_send_command().

Reviewed-by: Bart Van Assche <bvanassche@acm.org>

[PATCH v3 12/17] ufs: core: mcq: Find hardware queue to queue request

[Asutosh Das]

Adds support to find the hardware queue on which the request
would be queued.
Since the very first queue is to serve device commands, an offset
of 1 is added to the index of the hardware queue.

Co-developed-by: Can Guo <quic_cang@quicinc.com>
Signed-off-by: Can Guo <quic_cang@quicinc.com>
Signed-off-by: Asutosh Das <quic_asutoshd@quicinc.com>
---
 drivers/ufs/core/ufs-mcq.c     | 22 ++++++++++++++++++++++
 drivers/ufs/core/ufshcd-priv.h |  3 +++
 drivers/ufs/core/ufshcd.c      |  3 +++
 3 files changed, 28 insertions(+)

diff --git a/drivers/ufs/core/ufs-mcq.c b/drivers/ufs/core/ufs-mcq.c
index aed6272..50bb594 100644
--- a/drivers/ufs/core/ufs-mcq.c
+++ b/drivers/ufs/core/ufs-mcq.c
@@ -94,6 +94,28 @@ static const struct ufshcd_res_info ufs_res_info[RES_MAX] = {
 };
 
 /**
+ * ufshcd_mcq_req_to_hwq - find the hardware queue on which the
+ * request would be issued.
+ * @hba - per adapter instance
+ * @req - pointer to the request to be issued
+ *
+ * Returns the hardware queue instance on which the request would
+ * be queued.
+ */
+struct ufs_hw_queue *ufshcd_mcq_req_to_hwq(struct ufs_hba *hba,
+					 struct request *req)
+{
+	u32 utag, hwq;
+
+	utag = blk_mq_unique_tag(req);
+	hwq = blk_mq_unique_tag_to_hwq(utag);
+
+	/* uhq[0] is to serve device commands */
+	return &hba->uhq[hwq + UFSHCD_MCQ_IO_QUEUE_OFFSET];
+}
+
+
+/**
  * ufshcd_mcq_decide_queue_depth - decide the queue depth
  * @hba - per adapter instance
  *
diff --git a/drivers/ufs/core/ufshcd-priv.h b/drivers/ufs/core/ufshcd-priv.h
index 7df2d92..44ef266 100644
--- a/drivers/ufs/core/ufshcd-priv.h
+++ b/drivers/ufs/core/ufshcd-priv.h
@@ -56,7 +56,10 @@ int ufshcd_mcq_memory_alloc(struct ufs_hba *hba);
 void ufshcd_mcq_make_queues_operational(struct ufs_hba *hba);
 void ufshcd_mcq_config_mac(struct ufs_hba *hba, u32 max_active_cmds);
 void ufshcd_mcq_select_mcq_mode(struct ufs_hba *hba);
+struct ufs_hw_queue *ufshcd_mcq_req_to_hwq(struct ufs_hba *hba,
+					   struct request *req);
 
+#define UFSHCD_MCQ_IO_QUEUE_OFFSET	1
 #define SD_ASCII_STD true
 #define SD_RAW false
 int ufshcd_read_string_desc(struct ufs_hba *hba, u8 desc_index,
diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index ba19e12..7b08123 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -2888,6 +2888,9 @@ static int ufshcd_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd)
 		goto out;
 	}
 
+	if (is_mcq_enabled(hba))
+		hwq = ufshcd_mcq_req_to_hwq(hba, scsi_cmd_to_rq(cmd));
+
 	ufshcd_send_command(hba, tag, hwq);
 
 out:
-- 
2.7.4

Re: [PATCH v3 12/17] ufs: core: mcq: Find hardware queue to queue request

[Bart Van Assche]

On 10/20/22 11:03, Asutosh Das wrote:
> +struct ufs_hw_queue *ufshcd_mcq_req_to_hwq(struct ufs_hba *hba,
> +					 struct request *req)
> +{
> +	u32 utag, hwq;
> +
> +	utag = blk_mq_unique_tag(req);
> +	hwq = blk_mq_unique_tag_to_hwq(utag);

A minor stylistic nit: please combine declaration and assignment as follows:

         u32 utag = blk_mq_unique_tag(req);
         u32 hwq = blk_mq_unique_tag_to_hwq(utag);

> +	/* uhq[0] is to serve device commands */

is -> is used?

> +	return &hba->uhq[hwq + UFSHCD_MCQ_IO_QUEUE_OFFSET];

Otherwise this patch looks good to me. Hence:

Reviewed-by: Bart Van Assche <bvanassche@acm.org>

[PATCH v3 13/17] ufs: core: Prepare for completion in mcq

[Asutosh Das]

Modifies completion path APIs and adds completion queue
entry.

Co-developed-by: Can Guo <quic_cang@quicinc.com>
Signed-off-by: Can Guo <quic_cang@quicinc.com>
Signed-off-by: Asutosh Das <quic_asutoshd@quicinc.com>
---
 drivers/ufs/core/ufshcd-priv.h |  2 ++
 drivers/ufs/core/ufshcd.c      | 80 ++++++++++++++++++++++++++----------------
 2 files changed, 52 insertions(+), 30 deletions(-)

diff --git a/drivers/ufs/core/ufshcd-priv.h b/drivers/ufs/core/ufshcd-priv.h
index 44ef266..62ae7e51 100644
--- a/drivers/ufs/core/ufshcd-priv.h
+++ b/drivers/ufs/core/ufshcd-priv.h
@@ -50,6 +50,8 @@ int ufshcd_query_attr(struct ufs_hba *hba, enum query_opcode opcode,
 int ufshcd_query_flag(struct ufs_hba *hba, enum query_opcode opcode,
 	enum flag_idn idn, u8 index, bool *flag_res);
 void ufshcd_auto_hibern8_update(struct ufs_hba *hba, u32 ahit);
+void ufshcd_compl_one_cqe(struct ufs_hba *hba, int task_tag,
+			  struct cq_entry *cqe);
 int ufshcd_mcq_init(struct ufs_hba *hba);
 u32 ufshcd_mcq_decide_queue_depth(struct ufs_hba *hba);
 int ufshcd_mcq_memory_alloc(struct ufs_hba *hba);
diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index 7b08123..3962a5f 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -752,12 +752,17 @@ static inline bool ufshcd_is_device_present(struct ufs_hba *hba)
 /**
  * ufshcd_get_tr_ocs - Get the UTRD Overall Command Status
  * @lrbp: pointer to local command reference block
+ * @cqe: pointer to the completion queue entry
  *
  * This function is used to get the OCS field from UTRD
  * Returns the OCS field in the UTRD
  */
-static enum utp_ocs ufshcd_get_tr_ocs(struct ufshcd_lrb *lrbp)
+static enum utp_ocs ufshcd_get_tr_ocs(struct ufshcd_lrb *lrbp,
+				      struct cq_entry *cqe)
 {
+	if (cqe)
+		return le32_to_cpu(cqe->status) & MASK_OCS;
+
 	return le32_to_cpu(lrbp->utr_descriptor_ptr->header.dword_2) & MASK_OCS;
 }
 
@@ -3009,7 +3014,7 @@ static int ufshcd_wait_for_dev_cmd(struct ufs_hba *hba,
 	spin_lock_irqsave(hba->host->host_lock, flags);
 	hba->dev_cmd.complete = NULL;
 	if (likely(time_left)) {
-		err = ufshcd_get_tr_ocs(lrbp);
+		err = ufshcd_get_tr_ocs(lrbp, hba->dev_cmd.cqe);
 		if (!err)
 			err = ufshcd_dev_cmd_completion(hba, lrbp);
 	}
@@ -5199,18 +5204,20 @@ ufshcd_scsi_cmd_status(struct ufshcd_lrb *lrbp, int scsi_status)
  * ufshcd_transfer_rsp_status - Get overall status of the response
  * @hba: per adapter instance
  * @lrbp: pointer to local reference block of completed command
+ * @cqe: pointer to the completion queue entry
  *
  * Returns result of the command to notify SCSI midlayer
  */
 static inline int
-ufshcd_transfer_rsp_status(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
+ufshcd_transfer_rsp_status(struct ufs_hba *hba, struct ufshcd_lrb *lrbp,
+			   struct cq_entry *cqe)
 {
 	int result = 0;
 	int scsi_status;
 	enum utp_ocs ocs;
 
 	/* overall command status of utrd */
-	ocs = ufshcd_get_tr_ocs(lrbp);
+	ocs = ufshcd_get_tr_ocs(lrbp, cqe);
 
 	if (hba->quirks & UFSHCD_QUIRK_BROKEN_OCS_FATAL_ERROR) {
 		if (be32_to_cpu(lrbp->ucd_rsp_ptr->header.dword_1) &
@@ -5375,41 +5382,54 @@ static void ufshcd_release_scsi_cmd(struct ufs_hba *hba,
 }
 
 /**
- * __ufshcd_transfer_req_compl - handle SCSI and query command completion
+ * ufshcd_compl_one_cqe - handle a completion queue entry
  * @hba: per adapter instance
- * @completed_reqs: bitmask that indicates which requests to complete
+ * @task_tag: the task tag of the request to be completed
+ * @cqe: pointer to the completion queue entry
  */
-static void __ufshcd_transfer_req_compl(struct ufs_hba *hba,
-					unsigned long completed_reqs)
+void ufshcd_compl_one_cqe(struct ufs_hba *hba, int task_tag,
+			  struct cq_entry *cqe)
 {
 	struct ufshcd_lrb *lrbp;
 	struct scsi_cmnd *cmd;
-	int index;
-
-	for_each_set_bit(index, &completed_reqs, hba->nutrs) {
-		lrbp = &hba->lrb[index];
-		lrbp->compl_time_stamp = ktime_get();
-		cmd = lrbp->cmd;
-		if (cmd) {
-			if (unlikely(ufshcd_should_inform_monitor(hba, lrbp)))
-				ufshcd_update_monitor(hba, lrbp);
-			ufshcd_add_command_trace(hba, index, UFS_CMD_COMP);
-			cmd->result = ufshcd_transfer_rsp_status(hba, lrbp);
-			ufshcd_release_scsi_cmd(hba, lrbp);
-			/* Do not touch lrbp after scsi done */
-			scsi_done(cmd);
-		} else if (lrbp->command_type == UTP_CMD_TYPE_DEV_MANAGE ||
-			lrbp->command_type == UTP_CMD_TYPE_UFS_STORAGE) {
-			if (hba->dev_cmd.complete) {
-				ufshcd_add_command_trace(hba, index,
-							 UFS_DEV_COMP);
-				complete(hba->dev_cmd.complete);
-				ufshcd_clk_scaling_update_busy(hba);
-			}
+
+	lrbp = &hba->lrb[task_tag];
+	lrbp->compl_time_stamp = ktime_get();
+	cmd = lrbp->cmd;
+	if (cmd) {
+		if (unlikely(ufshcd_should_inform_monitor(hba, lrbp)))
+			ufshcd_update_monitor(hba, lrbp);
+		ufshcd_add_command_trace(hba, task_tag, UFS_CMD_COMP);
+		cmd->result = ufshcd_transfer_rsp_status(hba, lrbp, cqe);
+		ufshcd_release_scsi_cmd(hba, lrbp);
+		/* Do not touch lrbp after scsi done */
+		scsi_done(cmd);
+	} else if (lrbp->command_type == UTP_CMD_TYPE_DEV_MANAGE ||
+		   lrbp->command_type == UTP_CMD_TYPE_UFS_STORAGE) {
+		if (hba->dev_cmd.complete) {
+			hba->dev_cmd.cqe = cqe;
+			ufshcd_add_command_trace(hba, task_tag, UFS_DEV_COMP);
+			complete(hba->dev_cmd.complete);
+			ufshcd_clk_scaling_update_busy(hba);
 		}
 	}
 }
 
+
+/**
+ * __ufshcd_transfer_req_compl - handle SCSI and query command completion
+ * @hba: per adapter instance
+ * @completed_reqs: bitmask that indicates which requests to complete
+ */
+static void __ufshcd_transfer_req_compl(struct ufs_hba *hba,
+					unsigned long completed_reqs)
+{
+	int tag;
+
+	for_each_set_bit(tag, &completed_reqs, hba->nutrs)
+		ufshcd_compl_one_cqe(hba, tag, NULL);
+}
+
 /*
  * Returns > 0 if one or more commands have been completed or 0 if no
  * requests have been completed.
-- 
2.7.4

Re: [PATCH v3 13/17] ufs: core: Prepare for completion in mcq

[Bart Van Assche]

On 10/20/22 11:03, Asutosh Das wrote:
> Modifies completion path APIs and adds completion queue
> entry.

Modifies -> Modify
adds -> add

Patch descriptions should be written in the imperative mood.

Otherwise this patch looks good to me, hence:

Reviewed-by: Bart Van Assche <bvanassche@acm.org>

[PATCH v3 14/17] ufs: mcq: Add completion support of a cqe

[Asutosh Das]

Add support for completing requests from Completion Queue.
Some HC support vendor specific registers that provide a
bit-map of all CQ's which have at least one completed CQE.
Add this support.
The MCQ specification doesn't provide the Task Tag or its
equivalent in the Completion Queue Entry.
So use an indirect method to find the Task Tag from the
Completion Queue Entry.

Co-developed-by: Can Guo <quic_cang@quicinc.com>
Signed-off-by: Can Guo <quic_cang@quicinc.com>
Signed-off-by: Asutosh Das <quic_asutoshd@quicinc.com>
---
 drivers/ufs/core/ufs-mcq.c     | 55 ++++++++++++++++++++++++++++++++++++++++++
 drivers/ufs/core/ufshcd-priv.h | 43 +++++++++++++++++++++++++++++++++
 drivers/ufs/core/ufshcd.c      | 37 ++++++++++++++++++++++++++++
 drivers/ufs/host/ufs-qcom.c    | 16 ++++++++++++
 drivers/ufs/host/ufs-qcom.h    |  4 +++
 include/ufs/ufshcd.h           |  7 ++++++
 include/ufs/ufshci.h           |  3 +++
 7 files changed, 165 insertions(+)

diff --git a/drivers/ufs/core/ufs-mcq.c b/drivers/ufs/core/ufs-mcq.c
index 50bb594..7bf5f80 100644
--- a/drivers/ufs/core/ufs-mcq.c
+++ b/drivers/ufs/core/ufs-mcq.c
@@ -28,6 +28,7 @@
 	((((c) >> 16) & MCQ_QCFGPTR_MASK) * MCQ_QCFGPTR_UNIT)
 #define MCQ_QCFG_SIZE	0x40
 #define MCQ_ENTRY_SIZE_IN_DWORD	8
+#define CQE_UCD_BA GENMASK(63, 7)
 
 static int rw_queue_count_set(const char *val, const struct kernel_param *kp)
 {
@@ -324,6 +325,60 @@ static void __iomem *mcq_opr_base(struct ufs_hba *hba,
 	return opr->base + opr->stride * i;
 }
 
+u32 ufshcd_mcq_read_cqis(struct ufs_hba *hba, int i)
+{
+	return readl(mcq_opr_base(hba, OPR_CQIS, i) + REG_CQIS);
+}
+
+void ufshcd_mcq_write_cqis(struct ufs_hba *hba, u32 val, int i)
+{
+	writel(val, mcq_opr_base(hba, OPR_CQIS, i) + REG_CQIS);
+}
+
+static int ufshcd_mcq_get_tag(struct ufs_hba *hba,
+				     struct ufs_hw_queue *hwq,
+				     struct cq_entry *cqe)
+{
+	dma_addr_t dma_addr;
+
+	/* sizeof(struct utp_transfer_cmd_desc) must be a multiple of 128 */
+	BUILD_BUG_ON(sizeof(struct utp_transfer_cmd_desc) & GENMASK(6, 0));
+
+	/* Bits 63:7 UCD base address, 6:5 are reserved, 4:0 is SQ ID */
+	dma_addr = le64_to_cpu(cqe->command_desc_base_addr) & CQE_UCD_BA;
+
+	return (dma_addr - hba->ucdl_dma_addr) /
+		sizeof(struct utp_transfer_cmd_desc);
+}
+
+static void ufshcd_mcq_process_cqe(struct ufs_hba *hba,
+					    struct ufs_hw_queue *hwq)
+{
+	struct cq_entry *cqe = ufshcd_mcq_cur_cqe(hwq);
+	int tag;
+
+	tag = ufshcd_mcq_get_tag(hba, hwq, cqe);
+	ufshcd_compl_one_cqe(hba, tag, cqe);
+}
+
+unsigned long ufshcd_mcq_poll_cqe_nolock(struct ufs_hba *hba,
+					 struct ufs_hw_queue *hwq)
+{
+	unsigned long completed_reqs = 0;
+
+	ufshcd_mcq_update_cq_tail_slot(hwq);
+	while (!ufshcd_mcq_is_cq_empty(hwq)) {
+		ufshcd_mcq_process_cqe(hba, hwq);
+		ufshcd_mcq_inc_cq_head_slot(hwq);
+		completed_reqs++;
+	}
+
+	if (completed_reqs)
+		ufshcd_mcq_update_cq_head(hwq);
+
+	return completed_reqs;
+}
+
 void ufshcd_mcq_make_queues_operational(struct ufs_hba *hba)
 {
 	struct ufs_hw_queue *hwq;
diff --git a/drivers/ufs/core/ufshcd-priv.h b/drivers/ufs/core/ufshcd-priv.h
index 62ae7e51..417e2ca 100644
--- a/drivers/ufs/core/ufshcd-priv.h
+++ b/drivers/ufs/core/ufshcd-priv.h
@@ -58,6 +58,10 @@ int ufshcd_mcq_memory_alloc(struct ufs_hba *hba);
 void ufshcd_mcq_make_queues_operational(struct ufs_hba *hba);
 void ufshcd_mcq_config_mac(struct ufs_hba *hba, u32 max_active_cmds);
 void ufshcd_mcq_select_mcq_mode(struct ufs_hba *hba);
+u32 ufshcd_mcq_read_cqis(struct ufs_hba *hba, int i);
+void ufshcd_mcq_write_cqis(struct ufs_hba *hba, u32 val, int i);
+unsigned long ufshcd_mcq_poll_cqe_nolock(struct ufs_hba *hba,
+					 struct ufs_hw_queue *hwq);
 struct ufs_hw_queue *ufshcd_mcq_req_to_hwq(struct ufs_hba *hba,
 					   struct request *req);
 
@@ -242,6 +246,15 @@ static inline int ufshcd_mcq_vops_op_runtime_config(struct ufs_hba *hba)
 	return -EOPNOTSUPP;
 }
 
+static inline int ufshcd_vops_get_outstanding_cqs(struct ufs_hba *hba,
+						  unsigned long *ocqs)
+{
+	if (hba->vops && hba->vops->get_outstanding_cqs)
+		return hba->vops->get_outstanding_cqs(hba, ocqs);
+
+	return -EOPNOTSUPP;
+}
+
 extern const struct ufs_pm_lvl_states ufs_pm_lvl_states[];
 
 /**
@@ -332,4 +345,34 @@ static inline void ufshcd_inc_sq_tail(struct ufs_hw_queue *q)
 	writel(val, q->mcq_sq_tail);
 }
 
+static inline void ufshcd_mcq_update_cq_tail_slot(struct ufs_hw_queue *q)
+{
+	u32 val = readl(q->mcq_cq_tail);
+
+	q->cq_tail_slot = val / sizeof(struct cq_entry);
+}
+
+static inline bool ufshcd_mcq_is_cq_empty(struct ufs_hw_queue *q)
+{
+	return q->cq_head_slot == q->cq_tail_slot;
+}
+
+static inline void ufshcd_mcq_inc_cq_head_slot(struct ufs_hw_queue *q)
+{
+	q->cq_head_slot++;
+	if (q->cq_head_slot == q->max_entries)
+		q->cq_head_slot = 0;
+}
+
+static inline void ufshcd_mcq_update_cq_head(struct ufs_hw_queue *q)
+{
+	writel(q->cq_head_slot * sizeof(struct cq_entry), q->mcq_cq_head);
+}
+
+static inline struct cq_entry *ufshcd_mcq_cur_cqe(struct ufs_hw_queue *q)
+{
+	struct cq_entry *cqe = q->cqe_base_addr;
+
+	return cqe + q->cq_head_slot;
+}
 #endif /* _UFSHCD_PRIV_H_ */
diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index 3962a5f..af1f99e 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -6652,6 +6652,40 @@ static irqreturn_t ufshcd_tmc_handler(struct ufs_hba *hba)
 }
 
 /**
+ * ufshcd_handle_mcq_cq_events - handle MCQ completion queue events
+ * @hba: per adapter instance
+ *
+ * Returns IRQ_HANDLED if interrupt is handled
+ */
+static irqreturn_t ufshcd_handle_mcq_cq_events(struct ufs_hba *hba)
+{
+	struct ufs_hw_queue *hwq;
+	unsigned long outstanding_cqs;
+	unsigned int nr_queues;
+	int i, ret;
+	u32 events;
+
+	ret = ufshcd_vops_get_outstanding_cqs(hba, &outstanding_cqs);
+	if (ret)
+		outstanding_cqs = (1U << hba->nr_hw_queues) - 1;
+
+	/* Exclude the poll queues */
+	nr_queues = hba->nr_hw_queues - hba->nr_queues[HCTX_TYPE_POLL];
+	for_each_set_bit(i, &outstanding_cqs, nr_queues) {
+		hwq = &hba->uhq[i];
+
+		events = ufshcd_mcq_read_cqis(hba, i);
+		if (events)
+			ufshcd_mcq_write_cqis(hba, events, i);
+
+		if (events & UFSHCD_MCQ_CQIS_TAIL_ENT_PUSH_STS)
+			ufshcd_mcq_poll_cqe_nolock(hba, hwq);
+	}
+
+	return IRQ_HANDLED;
+}
+
+/**
  * ufshcd_sl_intr - Interrupt service routine
  * @hba: per adapter instance
  * @intr_status: contains interrupts generated by the controller
@@ -6676,6 +6710,9 @@ static irqreturn_t ufshcd_sl_intr(struct ufs_hba *hba, u32 intr_status)
 	if (intr_status & UTP_TRANSFER_REQ_COMPL)
 		retval |= ufshcd_transfer_req_compl(hba);
 
+	if (intr_status & MCQ_CQ_EVENT_STATUS)
+		retval |= ufshcd_handle_mcq_cq_events(hba);
+
 	return retval;
 }
 
diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
index 59e892c..36c40210 100644
--- a/drivers/ufs/host/ufs-qcom.c
+++ b/drivers/ufs/host/ufs-qcom.c
@@ -1454,6 +1454,21 @@ static int ufs_qcom_get_hba_mac(struct ufs_hba *hba)
 	return MAX_SUPP_MAC;
 }
 
+static int ufs_qcom_get_outstanding_cqs(struct ufs_hba *hba,
+					unsigned long *ocqs)
+{
+	u32 cqis_vs;
+	struct ufshcd_res_info *mcq_vs_res = &hba->res[RES_MCQ_VS];
+
+	if (!mcq_vs_res->base)
+		return -EINVAL;
+
+	cqis_vs = readl(mcq_vs_res->base + UFS_MEM_CQIS_VS);
+	*ocqs = cqis_vs;
+
+	return 0;
+}
+
 /*
  * struct ufs_hba_qcom_vops - UFS QCOM specific variant operations
  *
@@ -1479,6 +1494,7 @@ static const struct ufs_hba_variant_ops ufs_hba_qcom_vops = {
 	.program_key		= ufs_qcom_ice_program_key,
 	.get_hba_mac		= ufs_qcom_get_hba_mac,
 	.op_runtime_config	= ufs_qcom_op_runtime_config,
+	.get_outstanding_cqs	= ufs_qcom_get_outstanding_cqs,
 };
 
 /**
diff --git a/drivers/ufs/host/ufs-qcom.h b/drivers/ufs/host/ufs-qcom.h
index 44466a3..7769f03 100644
--- a/drivers/ufs/host/ufs-qcom.h
+++ b/drivers/ufs/host/ufs-qcom.h
@@ -72,6 +72,10 @@ enum {
 	UFS_UFS_DBG_RD_EDTL_RAM			= 0x1900,
 };
 
+enum {
+	UFS_MEM_CQIS_VS		= 0x8,
+};
+
 #define UFS_CNTLR_2_x_x_VEN_REGS_OFFSET(x)	(0x000 + x)
 #define UFS_CNTLR_3_x_x_VEN_REGS_OFFSET(x)	(0x400 + x)
 
diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h
index 2c572ff..ba4ef0a 100644
--- a/include/ufs/ufshcd.h
+++ b/include/ufs/ufshcd.h
@@ -296,6 +296,7 @@ struct ufs_pwr_mode_info {
  * @event_notify: called to notify important events
  * @get_hba_mac: called to get vendor specific mac value
  * @op_runtime_config: called to config Operation and runtime regs Pointers
+ * @get_outstanding_cqs: called to get outstanding completion queues
  */
 struct ufs_hba_variant_ops {
 	const char *name;
@@ -336,6 +337,8 @@ struct ufs_hba_variant_ops {
 				enum ufs_event_type evt, void *data);
 	int	(*get_hba_mac)(struct ufs_hba *hba);
 	int	(*op_runtime_config)(struct ufs_hba *hba);
+	int	(*get_outstanding_cqs)(struct ufs_hba *hba,
+				       unsigned long *ocqs);
 };
 
 /* clock gating state  */
@@ -1057,6 +1060,8 @@ struct ufs_hba {
  * @id: hardware queue ID
  * @sq_tp_slot: current slot to which SQ tail pointer is pointing
  * @sq_lock: serialize submission queue access
+ * @cq_tail_slot: current slot to which CQ tail pointer is pointing
+ * @cq_head_slot: current slot to which CQ head pointer is pointing
  */
 struct ufs_hw_queue {
 	void __iomem *mcq_sq_head;
@@ -1072,6 +1077,8 @@ struct ufs_hw_queue {
 	u32 id;
 	u32 sq_tail_slot;
 	spinlock_t sq_lock;
+	u32 cq_tail_slot;
+	u32 cq_head_slot;
 };
 
 static inline bool is_mcq_enabled(struct ufs_hba *hba)
diff --git a/include/ufs/ufshci.h b/include/ufs/ufshci.h
index 3d455e1..f3b3f42 100644
--- a/include/ufs/ufshci.h
+++ b/include/ufs/ufshci.h
@@ -266,6 +266,9 @@ enum {
 /* UTMRLRSR - UTP Task Management Request Run-Stop Register 80h */
 #define UTP_TASK_REQ_LIST_RUN_STOP_BIT		0x1
 
+/* CQISy - CQ y Interrupt Status Register  */
+#define UFSHCD_MCQ_CQIS_TAIL_ENT_PUSH_STS	0x1
+
 /* UICCMD - UIC Command */
 #define COMMAND_OPCODE_MASK		0xFF
 #define GEN_SELECTOR_INDEX_MASK		0xFFFF
-- 
2.7.4

Re: [PATCH v3 14/17] ufs: mcq: Add completion support of a cqe

[Bart Van Assche]

On 10/20/22 11:03, Asutosh Das wrote:
> Add support for completing requests from Completion Queue.
> Some HC support vendor specific registers that provide a
> bit-map of all CQ's which have at least one completed CQE.
> Add this support.
> The MCQ specification doesn't provide the Task Tag or its
> equivalent in the Completion Queue Entry.
> So use an indirect method to find the Task Tag from the
> Completion Queue Entry.

Please change "HC" into "host controllers" since it is an uncommon 
abbreviation.

> +	int tag;
> +
> +	tag = ufshcd_mcq_get_tag(hba, hwq, cqe);

Please combine the above declaration and assignment into a single line.

Otherwise this patch looks good to me. Hence:

Reviewed-by: Bart Van Assche <bvanassche@acm.org>

[PATCH v3 15/17] ufs: core: mcq: Add completion support in poll

[Asutosh Das]

Complete cqe requests in poll. Assumption is that
several poll completion may happen in different CPUs
for the same Completion Queue. Hence a spin lock
protection is added.

Co-developed-by: Can Guo <quic_cang@quicinc.com>
Signed-off-by: Can Guo <quic_cang@quicinc.com>
Signed-off-by: Asutosh Das <quic_asutoshd@quicinc.com>
---
 drivers/ufs/core/ufs-mcq.c     | 13 +++++++++++++
 drivers/ufs/core/ufshcd-priv.h |  2 ++
 drivers/ufs/core/ufshcd.c      |  7 +++++++
 include/ufs/ufshcd.h           |  2 ++
 4 files changed, 24 insertions(+)

diff --git a/drivers/ufs/core/ufs-mcq.c b/drivers/ufs/core/ufs-mcq.c
index 7bf5f80..b51ba35 100644
--- a/drivers/ufs/core/ufs-mcq.c
+++ b/drivers/ufs/core/ufs-mcq.c
@@ -379,6 +379,18 @@ unsigned long ufshcd_mcq_poll_cqe_nolock(struct ufs_hba *hba,
 	return completed_reqs;
 }
 
+unsigned long ufshcd_mcq_poll_cqe_lock(struct ufs_hba *hba,
+				       struct ufs_hw_queue *hwq)
+{
+	unsigned long completed_reqs;
+
+	spin_lock(&hwq->cq_lock);
+	completed_reqs = ufshcd_mcq_poll_cqe_nolock(hba, hwq);
+	spin_unlock(&hwq->cq_lock);
+
+	return completed_reqs;
+}
+
 void ufshcd_mcq_make_queues_operational(struct ufs_hba *hba)
 {
 	struct ufs_hw_queue *hwq;
@@ -472,6 +484,7 @@ int ufshcd_mcq_init(struct ufs_hba *hba)
 		hwq = &hba->uhq[i];
 		hwq->max_entries = hba->nutrs;
 		spin_lock_init(&hwq->sq_lock);
+		spin_lock_init(&hwq->cq_lock);
 	}
 
 	/* The very first HW queue is to serve device command */
diff --git a/drivers/ufs/core/ufshcd-priv.h b/drivers/ufs/core/ufshcd-priv.h
index 417e2ca..6e9bec6 100644
--- a/drivers/ufs/core/ufshcd-priv.h
+++ b/drivers/ufs/core/ufshcd-priv.h
@@ -64,6 +64,8 @@ unsigned long ufshcd_mcq_poll_cqe_nolock(struct ufs_hba *hba,
 					 struct ufs_hw_queue *hwq);
 struct ufs_hw_queue *ufshcd_mcq_req_to_hwq(struct ufs_hba *hba,
 					   struct request *req);
+unsigned long ufshcd_mcq_poll_cqe_lock(struct ufs_hba *hba,
+				       struct ufs_hw_queue *hwq);
 
 #define UFSHCD_MCQ_IO_QUEUE_OFFSET	1
 #define SD_ASCII_STD true
diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index af1f99e..aaade38 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -5439,6 +5439,13 @@ static int ufshcd_poll(struct Scsi_Host *shost, unsigned int queue_num)
 	struct ufs_hba *hba = shost_priv(shost);
 	unsigned long completed_reqs, flags;
 	u32 tr_doorbell;
+	struct ufs_hw_queue *hwq;
+
+	if (is_mcq_enabled(hba)) {
+		hwq = &hba->uhq[queue_num + UFSHCD_MCQ_IO_QUEUE_OFFSET];
+
+		return ufshcd_mcq_poll_cqe_lock(hba, hwq);
+	}
 
 	spin_lock_irqsave(&hba->outstanding_lock, flags);
 	tr_doorbell = ufshcd_readl(hba, REG_UTP_TRANSFER_REQ_DOOR_BELL);
diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h
index ba4ef0a..506fc6e 100644
--- a/include/ufs/ufshcd.h
+++ b/include/ufs/ufshcd.h
@@ -1062,6 +1062,7 @@ struct ufs_hba {
  * @sq_lock: serialize submission queue access
  * @cq_tail_slot: current slot to which CQ tail pointer is pointing
  * @cq_head_slot: current slot to which CQ head pointer is pointing
+ * @cq_lock: Synchronize between multiple polling instances
  */
 struct ufs_hw_queue {
 	void __iomem *mcq_sq_head;
@@ -1079,6 +1080,7 @@ struct ufs_hw_queue {
 	spinlock_t sq_lock;
 	u32 cq_tail_slot;
 	u32 cq_head_slot;
+	spinlock_t cq_lock;
 };
 
 static inline bool is_mcq_enabled(struct ufs_hba *hba)
-- 
2.7.4

Re: [PATCH v3 15/17] ufs: core: mcq: Add completion support in poll

[Bart Van Assche]

On 10/20/22 11:03, Asutosh Das wrote:
> Complete cqe requests in poll. Assumption is that
> several poll completion may happen in different CPUs
> for the same Completion Queue. Hence a spin lock
> protection is added.

Completion Queue -> completion queue

Otherwise this patch looks good to me. Hence:

Reviewed-by: Bart Van Assche <bvanassche@acm.org>

[PATCH v3 16/17] ufs: core: mcq: Enable Multi Circular Queue

[Asutosh Das]

Enable MCQ in the Host Controller.

Signed-off-by: Asutosh Das <quic_asutoshd@quicinc.com>
---
 drivers/ufs/core/ufshcd.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index aaade38..b39d35d 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -8327,6 +8327,12 @@ static void ufshcd_config_mcq(struct ufs_hba *hba)
 
 	hba->host->can_queue = hba->nutrs - UFSHCD_NUM_RESERVED;
 	hba->reserved_slot = hba->nutrs - UFSHCD_NUM_RESERVED;
+
+	/* Select MCQ mode */
+	ufshcd_writel(hba, ufshcd_readl(hba, REG_UFS_MEM_CFG) | 0x1,
+		      REG_UFS_MEM_CFG);
+	hba->mcq_enabled = true;
+
 	dev_info(hba->dev, "MCQ configured, nr_queues=%d, io_queues=%d, read_queue=%d, poll_queues=%d, queue_depth=%d\n",
 		 hba->nr_hw_queues, hba->nr_queues[HCTX_TYPE_DEFAULT],
 		 hba->nr_queues[HCTX_TYPE_READ], hba->nr_queues[HCTX_TYPE_POLL],
-- 
2.7.4

Re: [PATCH v3 16/17] ufs: core: mcq: Enable Multi Circular Queue

[Bart Van Assche]

On 10/20/22 11:03, Asutosh Das wrote:
> Enable MCQ in the Host Controller.

Reviewed-by: Bart Van Assche <bvanassche@acm.org>

[PATCH v3 17/17] ufs: qcom-host: Enable multi circular queue capability

[Asutosh Das]

Enable MCQ for Qualcomm UFS controllers

Signed-off-by: Asutosh Das <quic_asutoshd@quicinc.com>
---
 drivers/ufs/host/ufs-qcom.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
index 36c40210..b740299 100644
--- a/drivers/ufs/host/ufs-qcom.c
+++ b/drivers/ufs/host/ufs-qcom.c
@@ -853,6 +853,7 @@ static void ufs_qcom_set_caps(struct ufs_hba *hba)
 	hba->caps |= UFSHCD_CAP_CRYPTO;
 	hba->caps |= UFSHCD_CAP_AGGR_POWER_COLLAPSE;
 	hba->caps |= UFSHCD_CAP_RPM_AUTOSUSPEND;
+	hba->caps |= UFSHCD_CAP_MCQ_EN;
 
 	if (host->hw_ver.major >= 0x2) {
 		host->caps = UFS_QCOM_CAP_QUNIPRO |
-- 
2.7.4

Re: [PATCH v3 17/17] ufs: qcom-host: Enable multi circular queue capability

[Bart Van Assche]

On 10/20/22 11:03, Asutosh Das wrote:
> diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
> index 36c40210..b740299 100644
> --- a/drivers/ufs/host/ufs-qcom.c
> +++ b/drivers/ufs/host/ufs-qcom.c
> @@ -853,6 +853,7 @@ static void ufs_qcom_set_caps(struct ufs_hba *hba)
>   	hba->caps |= UFSHCD_CAP_CRYPTO;
>   	hba->caps |= UFSHCD_CAP_AGGR_POWER_COLLAPSE;
>   	hba->caps |= UFSHCD_CAP_RPM_AUTOSUSPEND;
> +	hba->caps |= UFSHCD_CAP_MCQ_EN;

Shouldn't we have a flag that disables MCQ rather than a flag that 
enables MCQ? Otherwise the above line will be duplicated in every single 
host controller driver that supports MCQ.

Thanks,

Bart.

Re: [PATCH v3 17/17] ufs: qcom-host: Enable multi circular queue capability

[Asutosh Das]

On Fri, Oct 28 2022 at 15:08 -0700, Bart Van Assche wrote:
>On 10/20/22 11:03, Asutosh Das wrote:
>>diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
>>index 36c40210..b740299 100644
>>--- a/drivers/ufs/host/ufs-qcom.c
>>+++ b/drivers/ufs/host/ufs-qcom.c
>>@@ -853,6 +853,7 @@ static void ufs_qcom_set_caps(struct ufs_hba *hba)
>>  	hba->caps |= UFSHCD_CAP_CRYPTO;
>>  	hba->caps |= UFSHCD_CAP_AGGR_POWER_COLLAPSE;
>>  	hba->caps |= UFSHCD_CAP_RPM_AUTOSUSPEND;
>>+	hba->caps |= UFSHCD_CAP_MCQ_EN;
>
>Shouldn't we have a flag that disables MCQ rather than a flag that 
>enables MCQ? Otherwise the above line will be duplicated in every 
>single host controller driver that supports MCQ.
>
Thanks, that makes sense.
I will drop this change and add a cap to disable MCQ via module parameter.

>Thanks,
>
>Bart.

-asd