scsi: ufs: qcom: Add MCQ ESI config vendor specific ops

Add MCQ ESI config vendor specific ops.
Co-developed-by: Asutosh Das <quic_asutoshd@quicinc.com>
Signed-off-by: Asutosh Das <quic_asutoshd@quicinc.com>
Signed-off-by: Can Guo <quic_cang@quicinc.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/ufs/host/ufs-qcom.c

@@ -1538,6 +1538,101 @@ static int ufs_qcom_get_outstanding_cqs(struct ufs_hba *hba,
 	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 id = irq - host->esi_base;
+	struct ufs_hw_queue *hwq = &hba->uhq[id];
+
+	ufshcd_mcq_write_cqis(hba, 0x1, id);
+	ufshcd_mcq_poll_cqe_nolock(hba, hwq);
+
+	return IRQ_HANDLED;
+}
+
+static int ufs_qcom_config_esi(struct ufs_hba *hba)
+{
+	struct ufs_qcom_host *host = ufshcd_get_variant(hba);
+	struct msi_desc *desc;
+	struct msi_desc *failed_desc = NULL;
+	int nr_irqs, ret;
+
+	if (host->esi_enabled)
+		return 0;
+	else if (host->esi_base < 0)
+		return -EINVAL;
+
+	/*
+	 * 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,
+				       IRQF_SHARED, "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);
+		}
+		platform_msi_domain_free_irqs(hba->dev);
+	} else {
+		if (host->hw_ver.major == 6 && host->hw_ver.minor == 0 &&
+		    host->hw_ver.step == 0) {
+			ufshcd_writel(hba,
+				      ufshcd_readl(hba, REG_UFS_CFG3) | 0x1F000,
+				      REG_UFS_CFG3);
+		}
+		ufshcd_mcq_enable_esi(hba);
+	}
+
+out:
+	if (ret) {
+		host->esi_base = -1;
+		dev_warn(hba->dev, "Failed to request Platform MSI %d\n", ret);
+	} else {
+		host->esi_enabled = true;
+	}
+
+	return ret;
+}
+
+#else
+static int ufs_qcom_config_esi(struct ufs_hba *hba)
+{
+	return -EOPNOTSUPP;
+}
+#endif
+
 /*
  * struct ufs_hba_qcom_vops - UFS QCOM specific variant operations
  *
@@ -1566,6 +1661,7 @@ static const struct ufs_hba_variant_ops ufs_hba_qcom_vops = {
 	.get_hba_mac		= ufs_qcom_get_hba_mac,
 	.op_runtime_config	= ufs_qcom_op_runtime_config,
 	.get_outstanding_cqs	= ufs_qcom_get_outstanding_cqs,
+	.config_esi		= ufs_qcom_config_esi,
 };
 
 /**
@@ -1599,6 +1695,7 @@ static int ufs_qcom_remove(struct platform_device *pdev)
 
 	pm_runtime_get_sync(&(pdev)->dev);
 	ufshcd_remove(hba);
+	platform_msi_domain_free_irqs(hba->dev);
 	return 0;
 }
 

drivers/ufs/host/ufs-qcom.h

@@ -52,6 +52,8 @@ enum {
 	 * added in HW Version 3.0.0
 	 */
 	UFS_AH8_CFG				= 0xFC,
+
+	REG_UFS_CFG3				= 0x271C,
 };
 
 /* QCOM UFS host controller vendor specific debug registers */
@@ -217,6 +219,9 @@ struct ufs_qcom_host {
 	struct gpio_desc *device_reset;
 
 	u32 hs_gear;
+
+	int esi_base;
+	bool esi_enabled;
 };
 
 static inline u32