[RFC,v2,2/2] scsi: ufs-qcom: Add MCQ support

Commit Message

Can Guo Aug. 11, 2022, 10:33 a.m. UTC

Use ESI and define Runtime and Operation definitions for MCQ.

Co-developed-by: Asutosh Das <[e-mail]>
Signed-off-by: Can Guo <[e-mail]>
Signed-off-by: Asutosh Das <[e-mail]>
---
 drivers/ufs/host/ufs-qcom.c | 125 ++++++++++++++++++++++++++++++++++++++++++++
 drivers/ufs/host/ufs-qcom.h |   4 ++
 2 files changed, 129 insertions(+)

Comments

Bart Van Assche Aug. 19, 2022, 2:48 a.m. UTC | #1

On 8/11/22 03:33, Can Guo wrote:
> +static int ufs_qcom_get_outstanding_cqs(struct ufs_hba *hba,
> +					unsigned long *ocqs)
> +{
> +	return -EINVAL;
> +}

Why does the get_outstanding_cqs vop exist since the only implementation 
of that vop returns EINVAL?

> +static int ufs_qcom_config_mcq_rop(struct ufs_hba *hba)
> +{
> +	struct ufshcd_mcq_rop_info_t *rop;
> +	struct ufshcd_res_info_t *mem_res, *sqdao_res;
> +	int i;
> +
> +	mem_res = &hba->res[RES_MEM];
> +	sqdao_res = &hba->res[RES_MCQ_SQD];
> +
> +	if (!mem_res->base || !sqdao_res->base)
> +		return -EINVAL;
> +
> +	for (i = 0; i < ROP_MAX; i++) {
> +		rop = &hba->mcq_rop[i];
> +		rop->offset = sqdao_res->resource->start -
> +			      mem_res->resource->start + 0x40 * i;
> +		rop->stride = 0x100;
> +		rop->base = sqdao_res->base + 0x40 * i;
> +	}
> +
> +	return 0;
> +}

Is there anything in the above function that is specific to the Qualcomm 
controller? If not, please move the above code into ufshcd.c.

> +static int ufs_qcom_get_hba_mac(struct ufs_hba *hba)
> +{
> +	return MAX_SUPP_MAC;
> +}

Since there is a register in the UFSHCI 4.0 specification from which the 
maximum number of outstanding commands can be retrieved, why does the 
get_hba_mac vop exist?

Thanks,

Bart.

Patch

diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
index 473fad8..1e25d8d 100644
--- a/drivers/ufs/host/ufs-qcom.c
+++ b/drivers/ufs/host/ufs-qcom.c
@@ -25,6 +25,8 @@ 
 #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 +1426,125 @@  static void ufs_qcom_config_scaling_param(struct ufs_hba *hba,
 }
 #endif
 
+static int ufs_qcom_get_outstanding_cqs(struct ufs_hba *hba,
+					unsigned long *ocqs)
+{
+	return -EINVAL;
+}
+
+static int ufs_qcom_config_mcq_rop(struct ufs_hba *hba)
+{
+	struct ufshcd_mcq_rop_info_t *rop;
+	struct ufshcd_res_info_t *mem_res, *sqdao_res;
+	int i;
+
+	mem_res = &hba->res[RES_MEM];
+	sqdao_res = &hba->res[RES_MCQ_SQD];
+
+	if (!mem_res->base || !sqdao_res->base)
+		return -EINVAL;
+
+	for (i = 0; i < ROP_MAX; i++) {
+		rop = &hba->mcq_rop[i];
+		rop->offset = sqdao_res->resource->start -
+			      mem_res->resource->start + 0x40 * i;
+		rop->stride = 0x100;
+		rop->base = sqdao_res->base + 0x40 * i;
+	}
+
+	return 0;
+}
+
+#ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
+static void ufs_qcom_write_msi_msg(struct msi_desc *desc, struct msi_msg *msg)
+{
+	struct device *dev = msi_desc_to_dev(desc);
+	struct ufs_hba *hba = dev_get_drvdata(dev);
+
+	ufshcd_mcq_config_esi(hba, msg);
+}
+
+static irqreturn_t ufs_qcom_mcq_esi_handler(int irq, void *__hba)
+{
+	struct ufs_hba *hba = __hba;
+	struct ufs_qcom_host *host = ufshcd_get_variant(hba);
+	u32 event_id = irq - host->esi_base;
+	struct ufs_hw_queue *hwq = &hba->uhq[event_id];
+
+	ufshcd_mcq_poll_cqe_nolock(hba, hwq);
+
+	return IRQ_HANDLED;
+}
+
+static int ufs_qcom_config_mcq_esi(struct ufs_hba *hba)
+{
+	struct ufs_qcom_host *host = ufshcd_get_variant(hba);
+	struct msi_desc *desc;
+	struct msi_desc *failed_desc = NULL;
+	u32 reg;
+	int nr_irqs, ret;
+
+	/*
+	 * 1. We only handle CQs as of now.
+	 * 2. Poll queues do not need ESI.
+	 */
+	nr_irqs = hba->nr_hw_queues - hba->nr_queues[HCTX_TYPE_POLL];
+	ret = platform_msi_domain_alloc_irqs(hba->dev, nr_irqs,
+					     ufs_qcom_write_msi_msg);
+	if (ret)
+		goto out;
+
+	msi_for_each_desc(desc, hba->dev, MSI_DESC_ALL) {
+		if (!desc->msi_index)
+			host->esi_base = desc->irq;
+
+		ret = devm_request_irq(hba->dev, desc->irq,
+				       ufs_qcom_mcq_esi_handler,
+				       0, "qcom-mcq-esi", hba);
+		if (ret) {
+			dev_err(hba->dev, "%s: Fail to request IRQ for %d, err = %d\n",
+				__func__, desc->irq, ret);
+			failed_desc = desc;
+			break;
+		}
+	}
+
+	if (ret) {
+		/* Rewind */
+		msi_for_each_desc(desc, hba->dev, MSI_DESC_ALL) {
+			if (desc == failed_desc)
+				break;
+			devm_free_irq(hba->dev, desc->irq, hba);
+		}
+	} else {
+		if (host->hw_ver.major == 6 && host->hw_ver.minor == 0 &&
+		    host->hw_ver.step == 0) {
+			reg = ufshcd_readl(hba, REG_UFS_CFG3);
+			reg |= 0x1F000;
+			ufshcd_writel(hba, reg, REG_UFS_CFG3);
+			reg = ufshcd_readl(hba, REG_UFS_CFG3);
+		}
+		ufshcd_mcq_enable_esi(hba);
+	}
+
+out:
+	if (ret)
+		dev_warn(hba->dev, "Failed to request Platform MSI %d\n", ret);
+	return ret;
+}
+
+#else
+static int ufs_qcom_config_mcq_esi(struct ufs_hba *hba)
+{
+	return -EOPNOTSUPP;
+}
+#endif
+
+static int ufs_qcom_get_hba_mac(struct ufs_hba *hba)
+{
+	return MAX_SUPP_MAC;
+}
+
 /*
  * struct ufs_hba_qcom_vops - UFS QCOM specific variant operations
  *
@@ -1447,6 +1568,10 @@  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_outstanding_cqs	= ufs_qcom_get_outstanding_cqs,
+	.config_mcq_rop		= ufs_qcom_config_mcq_rop,
+	.config_mcq_esi		= ufs_qcom_config_mcq_esi,
+	.get_hba_mac		= ufs_qcom_get_hba_mac,
 };
 
 /**
diff --git a/drivers/ufs/host/ufs-qcom.h b/drivers/ufs/host/ufs-qcom.h
index 44466a3..17c052e 100644
--- a/drivers/ufs/host/ufs-qcom.h
+++ b/drivers/ufs/host/ufs-qcom.h
@@ -53,6 +53,8 @@  enum {
 	 * added in HW Version 3.0.0
 	 */
 	UFS_AH8_CFG				= 0xFC,
+
+	REG_UFS_CFG3				= 0x271C,
 };
 
 /* QCOM UFS host controller vendor specific debug registers */
@@ -221,6 +223,8 @@  struct ufs_qcom_host {
 	struct reset_controller_dev rcdev;
 
 	struct gpio_desc *device_reset;
+
+	int esi_base;
 };
 
 static inline u32