[RFC PATCH v2 1/2] scsi: ufs: Add Multi-Circular Queue support

[RFC PATCH v2 1/2] scsi: ufs: Add Multi-Circular Queue support

[Can Guo]

From: Asutosh Das <quic_asutoshd@quicinc.com>

Adds MCQ support to UFS.

The design uses shared tags across all the hw queues.
The queue-depth is chosen within range supported by controller &
device. It also takes EXT_IID into account while choosing the queue
depth.

It supports default, read, poll and a dev cmd queue.
It enables MCQ after determining the queue-depth that the ufs
device supports.

Co-developed-by: Can Guo <quic_cang@quicinc.com>
Signed-off-by: Asutosh Das <quic_asutoshd@quicinc.com>
Signed-off-by: Can Guo <quic_cang@quicinc.com>
---
 drivers/ufs/core/Makefile  |   2 +-
 drivers/ufs/core/ufs-mcq.c | 524 +++++++++++++++++++++++++++++++++++++++++++++
 drivers/ufs/core/ufshcd.c  | 394 ++++++++++++++++++++++++++--------
 include/ufs/ufs.h          |   5 +
 include/ufs/ufshcd.h       | 223 ++++++++++++++++++-
 include/ufs/ufshci.h       |  77 +++++++
 6 files changed, 1135 insertions(+), 90 deletions(-)
 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..9d87153
--- /dev/null
+++ b/drivers/ufs/core/ufs-mcq.c
@@ -0,0 +1,524 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2022, Linux Foundation. All rights reserved.
+ *
+ * Authors:
+ *	Asutosh Das <quic_asutoshd@quicinc.com>
+ *	Can Guo <quic_cang@quicinc.com>
+ */
+
+#include <linux/platform_device.h>
+#include <linux/dma-mapping.h>
+#include <linux/module.h>
+#include <asm/unaligned.h>
+
+#include <ufs/ufshcd.h>
+
+#define MCQ_CFG_MAC_OFFSET	8
+#define MCQ_CFG_MAC_MASK	UFS_MASK(0x1FF, MCQ_CFG_MAC_OFFSET)
+
+#define MCQ_QCFGPTR_MASK	0xff
+#define MCQ_QCFGPTR_UNIT	0x200
+#define mcq_sqattr_offset(c) \
+	((((c) >> 16) & MCQ_QCFGPTR_MASK) * MCQ_QCFGPTR_UNIT)
+
+#define MCQ_ENTRY_SIZE_IN_DWORD	8
+#define MCQ_QCFG_SIZE	0x40
+
+static unsigned int dev_cmd_queue = 1;
+static unsigned int read_queues;
+static unsigned int poll_queues = 1;
+
+static int rw_queue_count_set(const char *val, const struct kernel_param *kp)
+{
+	unsigned int n;
+	int ret;
+
+	ret = kstrtouint(val, 10, &n);
+	if (ret)
+		return ret;
+	if (n > num_possible_cpus())
+		return -EINVAL;
+	return param_set_uint(val, kp);
+}
+
+static const struct kernel_param_ops rw_queue_count_ops = {
+	.set = rw_queue_count_set,
+	.get = param_get_uint,
+};
+
+static unsigned int rw_queues = 8;
+module_param_cb(rw_queues, &rw_queue_count_ops, &rw_queues, 0644);
+MODULE_PARM_DESC(rw_queues, "Number of queues used for rw. Default value is 8");
+
+/* resources */
+static const struct ufshcd_res_info_t ufshcd_res_info[RES_MAX] = {
+	{"ufs_mem", NULL, NULL},
+	{"mcq", NULL, NULL},
+	{"mcq_sqd", NULL, NULL},
+	{"mcq_sqis", NULL, NULL},
+	{"mcq_cqd", NULL, NULL},
+	{"mcq_cqis", NULL, NULL},
+	{"mcq_vs", NULL, NULL},
+};
+
+u32 ufshcd_mcq_find_queue_depth(struct ufs_hba *hba)
+{
+	u32 qd, val, mac;
+
+	val = ufshcd_readl(hba, REG_UFS_MCQ_CFG);
+	mac = ufshcd_mcq_vops_get_hba_mac(hba);
+	if (mac < 0)
+		mac = (val & MCQ_CFG_MAC_MASK) >> MCQ_CFG_MAC_OFFSET;
+
+	/*  MAC is a 0 based value. */
+	mac += 1;
+	qd = min_t(u32, mac, hba->dev_info.bqueuedepth);
+	if (!qd)
+		qd = mac;
+
+	/* Adjust queue depth based on ext_iid support. */
+	if (qd > 256 && (!hba->ext_iid_sup || !hba->dev_info.b_ext_iid_en))
+		qd = 256;
+	if (qd > 4096 && hba->ext_iid_sup && hba->dev_info.b_ext_iid_en)
+		qd = 4096;
+
+	return qd;
+}
+EXPORT_SYMBOL_GPL(ufshcd_mcq_find_queue_depth);
+
+void ufshcd_mcq_config_mac(struct ufs_hba *hba, u32 set)
+{
+	u32 val;
+
+	val = ufshcd_readl(hba, REG_UFS_MCQ_CFG);
+	val &= ~MCQ_CFG_MAC_MASK;
+	val |= set << MCQ_CFG_MAC_OFFSET;
+	ufshcd_writel(hba, val, REG_UFS_MCQ_CFG);
+}
+EXPORT_SYMBOL_GPL(ufshcd_mcq_config_mac);
+
+struct ufs_hw_queue *ufshcd_mcq_find_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);
+
+	return &hba->uhq[hwq + UFSHCD_MCQ_IO_QUEUE_OFFSET];
+}
+EXPORT_SYMBOL_GPL(ufshcd_mcq_find_hwq);
+
+int ufshcd_mcq_memory_alloc(struct ufs_hba *hba)
+{
+	struct ufs_hw_queue *hwq;
+	size_t utrdl_size, cqe_size;
+	int i;
+
+	for_each_hw_queue(hba, 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 || WARN_ON(hwq->sqe_dma_addr &
+						  (PAGE_SIZE - 1))) {
+			dev_err(hba->dev, "Alloc SQE 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 || WARN_ON(hwq->cqe_dma_addr &
+						  (PAGE_SIZE - 1))) {
+			dev_err(hba->dev, "Alloc CQE failed\n");
+			return -ENOMEM;
+		}
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(ufshcd_mcq_memory_alloc);
+
+#define MCQ_CFG_n(r, i) \
+	((r) + MCQ_QCFG_SIZE * (i))
+#define MCQ_ROP_OFFSET_n(p, i) \
+	(hba->mcq_rop[(p)].offset + hba->mcq_rop[(p)].stride * (i))
+
+static inline void __iomem *mcq_rop_base(struct ufs_hba *hba,
+					 enum ufshcd_mcq_rop n, int i)
+{
+	struct ufshcd_mcq_rop_info_t *rop = &hba->mcq_rop[n];
+
+	return rop->base + rop->stride * i;
+}
+
+void ufshcd_mcq_make_queues_operational(struct ufs_hba *hba)
+{
+	struct ufs_hw_queue *hwq;
+	u16 qsize;
+	int i;
+
+	for_each_hw_queue(hba, i) {
+		hwq = &hba->uhq[i];
+		hwq->id = i;
+		qsize = hwq->max_entries * MCQ_ENTRY_SIZE_IN_DWORD - 1;
+
+		/* SQLBA */
+		ufsmcq_writel(hba, lower_32_bits(hwq->sqe_dma_addr),
+			      MCQ_CFG_n(REG_SQLBA, i));
+		/* SQUBA */
+		ufsmcq_writel(hba, upper_32_bits(hwq->sqe_dma_addr),
+			      MCQ_CFG_n(REG_SQUBA, i));
+		/* SQDAO */
+		ufsmcq_writel(hba, MCQ_ROP_OFFSET_n(ROP_SQD, i),
+			      MCQ_CFG_n(REG_SQDAO, i));
+		/* SQISAO */
+		ufsmcq_writel(hba, MCQ_ROP_OFFSET_n(ROP_SQIS, i),
+			      MCQ_CFG_n(REG_SQISAO, i));
+
+		/* CQLBA */
+		ufsmcq_writel(hba, lower_32_bits(hwq->cqe_dma_addr),
+			      MCQ_CFG_n(REG_CQLBA, i));
+		/* CQUBA */
+		ufsmcq_writel(hba, upper_32_bits(hwq->cqe_dma_addr),
+			      MCQ_CFG_n(REG_CQUBA, i));
+		/* CQDAO */
+		ufsmcq_writel(hba, MCQ_ROP_OFFSET_n(ROP_CQD, i),
+			      MCQ_CFG_n(REG_CQDAO, i));
+		/* CQISAO */
+		ufsmcq_writel(hba, MCQ_ROP_OFFSET_n(ROP_CQIS, i),
+			      MCQ_CFG_n(REG_CQISAO, i));
+
+		/* Save the base addresses for quicker access */
+		hwq->mcq_sq_hp = mcq_rop_base(hba, ROP_SQD, i) + REG_SQHP;
+		hwq->mcq_sq_tp = mcq_rop_base(hba, ROP_SQD, i) + REG_SQTP;
+		hwq->mcq_cq_hp = mcq_rop_base(hba, ROP_CQD, i) + REG_CQHP;
+		hwq->mcq_cq_tp = mcq_rop_base(hba, ROP_CQD, i) + REG_CQTP;
+
+		/* enable CQIE.TEPS interrupt only for non-poll queues */
+		if (i < hba->nr_hw_queues - hba->nr_queues[HCTX_TYPE_POLL])
+			writel(1, mcq_rop_base(hba, ROP_CQIS, i) + REG_CQIE);
+
+		/* cqen|size */
+		ufsmcq_writel(hba, (1 << 31) | qsize, MCQ_CFG_n(REG_CQATTR, i));
+
+		/* sqen|size|cqid */
+		ufsmcq_writel(hba, (1 << 31) | qsize | (i << 16),
+			      MCQ_CFG_n(REG_SQATTR, i));
+	}
+}
+EXPORT_SYMBOL_GPL(ufshcd_mcq_make_queues_operational);
+
+static void ufshcd_mcq_release_resource(struct ufs_hba *hba)
+{
+	struct ufshcd_res_info_t *res;
+	int i;
+
+	for (i = RES_MCQ; i < RES_MAX; i++) {
+		res = &hba->res[i];
+
+		if (res->base) {
+			devm_iounmap(hba->dev, res->base);
+			res->base = NULL;
+		}
+
+		if (res->is_alloc)
+			devm_kfree(hba->dev, res->resource);
+	}
+}
+
+static int ufshcd_mcq_config_resource(struct ufs_hba *hba)
+{
+	struct platform_device *pdev = to_platform_device(hba->dev);
+	struct ufshcd_res_info_t *res;
+	struct resource *res_mem, *res_mcq;
+	int i, ret = 0;
+
+	memcpy(hba->res, ufshcd_res_info, sizeof(ufshcd_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_err(hba->dev, "Resource %s not provided\n");
+			if (i == RES_MEM)
+				return -ENOMEM;
+			continue;
+		} else if (i == RES_MEM) {
+			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, PTR_ERR(res->base));
+			res->base = NULL;
+			ret = PTR_ERR(res->base);
+			goto out_err;
+		}
+	}
+
+	res = &hba->res[RES_MCQ];
+	/* MCQ resource provided */
+	if (res->base)
+		goto out;
+
+	/* Manually allocate MCQ resource */
+	res_mcq = res->resource;
+	res_mcq = devm_kzalloc(hba->dev, sizeof(*res_mcq), GFP_KERNEL);
+	if (!res_mcq) {
+		dev_err(hba->dev, "Failed to alloate MCQ resource\n");
+		goto out_err;
+	}
+	res->is_alloc = true;
+
+	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 %d\n", ret);
+		goto out_err;
+	}
+
+	res->base = devm_ioremap_resource(hba->dev, res_mcq);
+	if (IS_ERR(res->base)) {
+		dev_err(hba->dev, "Map MCQ registers failed, err=%d\n",
+			PTR_ERR(res->base));
+		ret = PTR_ERR(res->base);
+		res->base = NULL;
+		goto out_err;
+	}
+
+out:
+	hba->mcq_base = res->base;
+	return 0;
+
+out_err:
+	ufshcd_mcq_release_resource(hba);
+	return ret;
+}
+
+static void ufshcd_mcq_config_nr_queues(struct ufs_hba *hba)
+{
+	int i;
+	u32 hbaq_cap, def_nr_queues, max_nr_queues;
+	struct Scsi_Host *host = hba->host;
+
+	/* default queues will be less than or equal to max_nr_queues */
+	def_nr_queues = rw_queues + poll_queues + read_queues + dev_cmd_queue;
+	max_nr_queues = num_possible_cpus() + poll_queues + read_queues +
+		dev_cmd_queue;
+	hbaq_cap = hba->mcq_capabilities & 0xff;
+
+	if (hbaq_cap >= max_nr_queues)
+		hba->nr_queues[HCTX_TYPE_DEFAULT] = num_possible_cpus();
+	else if (hbaq_cap >= def_nr_queues)
+		hba->nr_queues[HCTX_TYPE_DEFAULT] = rw_queues;
+	else
+		hba->nr_queues[HCTX_TYPE_DEFAULT] = hbaq_cap - read_queues -
+						    poll_queues - dev_cmd_queue;
+
+	hba->nr_queues[HCTX_TYPE_READ] = read_queues;
+	hba->nr_queues[HCTX_TYPE_POLL] = poll_queues;
+
+	for (i = 0; i < HCTX_MAX_TYPES; i++)
+		host->nr_hw_queues += hba->nr_queues[i];
+
+	/* One more reserved for dev_cmd_queue */
+	hba->nr_hw_queues = host->nr_hw_queues + 1;
+}
+
+int ufshcd_mcq_init(struct ufs_hba *hba)
+{
+	struct Scsi_Host *host = hba->host;
+	struct ufs_hw_queue *hwq;
+	int i, ret = 0;
+
+	if (!is_mcq_supported(hba))
+		return 0;
+
+	ufshcd_mcq_config_nr_queues(hba);
+
+	ret = ufshcd_mcq_config_resource(hba);
+	if (ret) {
+		dev_err(hba->dev, "Failed to config MCQ resource\n");
+		return ret;
+	}
+
+	ret = ufshcd_mcq_vops_config_rop(hba);
+	if (ret) {
+		dev_err(hba->dev, "MCQ Runtime Operation Pointers not configured\n");
+		goto out_err;
+	}
+
+	host->host_tagset = 1;
+
+	hba->uhq = devm_kmalloc(hba->dev,
+				hba->nr_hw_queues * sizeof(struct ufs_hw_queue),
+				GFP_KERNEL);
+	if (!hba->uhq) {
+		dev_err(hba->dev, "Alloc ufs hw queue failed\n");
+		ret = -ENOMEM;
+		goto out_err;
+	}
+
+	for_each_hw_queue(hba, i) {
+		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 dev_cmd */
+	hba->dev_cmd_queue = &hba->uhq[0];
+	/* Give dev_cmd_queue the minimal num of entries */
+	hba->dev_cmd_queue->max_entries = 2;
+
+	/* Selct MCQ mode */
+	ufshcd_writel(hba, ufshcd_readl(hba, REG_UFS_MEM_CFG) | 0x1,
+		      REG_UFS_MEM_CFG);
+	hba->use_mcq = true;
+
+	return 0;
+
+out_err:
+	ufshcd_mcq_release_resource(hba);
+	devm_kfree(hba->dev, hba->uhq);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(ufshcd_mcq_init);
+
+u32 ufshcd_mcq_read_cqis(struct ufs_hba *hba, int i)
+{
+	return readl(mcq_rop_base(hba, ROP_CQIS, i) + REG_CQIS);
+}
+EXPORT_SYMBOL_GPL(ufshcd_mcq_read_cqis);
+
+void ufshcd_mcq_write_cqis(struct ufs_hba *hba, u32 val, int i)
+{
+	writel(val, mcq_rop_base(hba, ROP_CQIS, i) + REG_CQIS);
+}
+EXPORT_SYMBOL_GPL(ufshcd_mcq_write_cqis);
+
+/**
+ * ufshcd_mcq_enable_cq_intr - Enable MCQ completion queue interrupts
+ * @hba: per adapter instance
+ * @intrs: interrupt bits
+ */
+void ufshcd_mcq_enable_cq_intr(struct ufs_hba *hba, u32 intrs)
+{
+	int i;
+	u32 set;
+
+	for_each_hw_queue(hba, i) {
+		/* enable CQIS.TEPS interrupt only for non-poll queues */
+		if (i >= hba->nr_hw_queues - hba->nr_queues[HCTX_TYPE_POLL])
+			continue;
+
+		set = readl(mcq_rop_base(hba, ROP_CQIS, i) + REG_CQIE);
+		set |= intrs;
+		writel(set, mcq_rop_base(hba, ROP_CQIS, i) + REG_CQIE);
+	}
+}
+EXPORT_SYMBOL_GPL(ufshcd_mcq_enable_cq_intr);
+
+/**
+ * ufshcd_mcq_disable_cq_intr - Disable MCQ completion queue interrupts
+ * @hba: per adapter instance
+ * @intrs: interrupt bits
+ */
+void ufshcd_mcq_disable_cq_intr(struct ufs_hba *hba, u32 intrs)
+{
+	int i;
+	u32 set;
+
+	for_each_hw_queue(hba, i) {
+		set = readl(mcq_rop_base(hba, ROP_CQIS, i) + REG_CQIE);
+		set &= ~intrs;
+		writel(set, mcq_rop_base(hba, ROP_CQIS, i) + REG_CQIE);
+	}
+}
+EXPORT_SYMBOL_GPL(ufshcd_mcq_disable_cq_intr);
+
+void ufshcd_mcq_enable_esi(struct ufs_hba *hba)
+{
+	ufshcd_writel(hba, ufshcd_readl(hba, REG_UFS_MEM_CFG) | 0x2,
+		      REG_UFS_MEM_CFG);
+}
+EXPORT_SYMBOL_GPL(ufshcd_mcq_enable_esi);
+
+void ufshcd_mcq_config_esi(struct ufs_hba *hba, struct msi_msg *msg)
+{
+	ufshcd_writel(hba, msg->address_lo, REG_UFS_ESILBA);
+	ufshcd_writel(hba, msg->address_hi, REG_UFS_ESIUBA);
+}
+EXPORT_SYMBOL_GPL(ufshcd_mcq_config_esi);
+
+static inline int ufshcd_mcq_get_tag(struct ufs_hba *hba,
+				     struct ufs_hw_queue *hwq,
+				     struct cq_entry *cqe)
+{
+	dma_addr_t dma_addr;
+
+	dma_addr = ((u64)le32_to_cpu(cqe->command_desc_base_addr_hi) << 32) |
+		   (le32_to_cpu(cqe->command_desc_base_addr_lo) & 0xffffff80);
+
+	return (dma_addr - hba->ucdl_dma_addr) /
+		sizeof_utp_transfer_cmd_desc(hba);
+}
+
+static inline void ufshcd_mcq_process_event(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_task(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_tp_slot(hwq);
+	while (!ufshcd_mcq_is_cq_empty(hwq)) {
+		ufshcd_mcq_process_event(hba, hwq);
+		ufshcd_mcq_inc_cq_hp_slot(hwq);
+		completed_reqs++;
+	}
+
+	if (completed_reqs)
+		ufshcd_mcq_update_cq_hp(hwq);
+
+	return completed_reqs;
+}
+EXPORT_SYMBOL_GPL(ufshcd_mcq_poll_cqe_nolock);
+
+unsigned long ufshcd_mcq_poll_cqe_lock(struct ufs_hba *hba,
+				       struct ufs_hw_queue *hwq)
+{
+	unsigned long completed_reqs, flags;
+
+	spin_lock_irqsave(&hwq->cq_lock, flags);
+	completed_reqs = ufshcd_mcq_poll_cqe_nolock(hba, hwq);
+	spin_unlock_irqrestore(&hwq->cq_lock, flags);
+
+	return completed_reqs;
+}
+EXPORT_SYMBOL_GPL(ufshcd_mcq_poll_cqe_lock);
diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index f4f8ded..f4c1752 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -42,6 +42,11 @@
 #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
 
@@ -249,7 +254,7 @@ static int ufshcd_reset_and_restore(struct ufs_hba *hba);
 static int ufshcd_eh_host_reset_handler(struct scsi_cmnd *cmd);
 static int ufshcd_clear_tm_cmd(struct ufs_hba *hba, int tag);
 static void ufshcd_hba_exit(struct ufs_hba *hba);
-static int ufshcd_probe_hba(struct ufs_hba *hba, bool init_dev_params);
+static int ufshcd_probe_hba(struct ufs_hba *hba, bool initial_boot);
 static int ufshcd_setup_clocks(struct ufs_hba *hba, bool on);
 static inline void ufshcd_add_delay_before_dme_cmd(struct ufs_hba *hba);
 static int ufshcd_host_reset_and_restore(struct ufs_hba *hba);
@@ -310,10 +315,11 @@ static void ufshcd_scsi_block_requests(struct ufs_hba *hba)
 		scsi_block_requests(hba->host);
 }
 
-static void ufshcd_add_cmd_upiu_trace(struct ufs_hba *hba, unsigned int tag,
+static void ufshcd_add_cmd_upiu_trace(struct ufs_hba *hba,
+				      struct ufshcd_lrb *lrbp,
 				      enum ufs_trace_str_t str_t)
 {
-	struct utp_upiu_req *rq = hba->lrb[tag].ucd_req_ptr;
+	struct utp_upiu_req *rq = lrbp->ucd_req_ptr;
 	struct utp_upiu_header *header;
 
 	if (!trace_ufshcd_upiu_enabled())
@@ -322,7 +328,7 @@ static void ufshcd_add_cmd_upiu_trace(struct ufs_hba *hba, unsigned int tag,
 	if (str_t == UFS_CMD_SEND)
 		header = &rq->header;
 	else
-		header = &hba->lrb[tag].ucd_rsp_ptr->header;
+		header = &lrbp->ucd_rsp_ptr->header;
 
 	trace_ufshcd_upiu(dev_name(hba->dev), str_t, header, &rq->sc.cdb,
 			  UFS_TSF_CDB);
@@ -379,13 +385,13 @@ static void ufshcd_add_uic_command_trace(struct ufs_hba *hba,
 				 ufshcd_readl(hba, REG_UIC_COMMAND_ARG_3));
 }
 
-static void ufshcd_add_command_trace(struct ufs_hba *hba, unsigned int tag,
+static void ufshcd_add_command_trace(struct ufs_hba *hba,
+				     struct ufshcd_lrb *lrbp,
 				     enum ufs_trace_str_t str_t)
 {
 	u64 lba = 0;
 	u8 opcode = 0, group_id = 0;
 	u32 intr, doorbell;
-	struct ufshcd_lrb *lrbp = &hba->lrb[tag];
 	struct scsi_cmnd *cmd = lrbp->cmd;
 	struct request *rq = scsi_cmd_to_rq(cmd);
 	int transfer_len = -1;
@@ -394,7 +400,7 @@ static void ufshcd_add_command_trace(struct ufs_hba *hba, unsigned int tag,
 		return;
 
 	/* trace UPIU also */
-	ufshcd_add_cmd_upiu_trace(hba, tag, str_t);
+	ufshcd_add_cmd_upiu_trace(hba, lrbp, str_t);
 	if (!trace_ufshcd_command_enabled())
 		return;
 
@@ -419,7 +425,7 @@ static void ufshcd_add_command_trace(struct ufs_hba *hba, unsigned int tag,
 
 	intr = ufshcd_readl(hba, REG_INTERRUPT_STATUS);
 	doorbell = ufshcd_readl(hba, REG_UTP_TRANSFER_REQ_DOOR_BELL);
-	trace_ufshcd_command(dev_name(hba->dev), str_t, tag,
+	trace_ufshcd_command(dev_name(hba->dev), str_t, lrbp->task_tag,
 			doorbell, transfer_len, intr, lba, opcode, group_id);
 }
 
@@ -739,8 +745,11 @@ static inline bool ufshcd_is_device_present(struct ufs_hba *hba)
  * 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;
 }
 
@@ -2131,27 +2140,43 @@ 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
+ * @lrbp: pointer to lrb
+ * @hwq: hardware queue
  */
 static inline
-void ufshcd_send_command(struct ufs_hba *hba, unsigned int task_tag)
+void ufshcd_send_command(struct ufs_hba *hba, struct ufshcd_lrb *lrbp,
+			 struct ufs_hw_queue *hwq)
 {
-	struct ufshcd_lrb *lrbp = &hba->lrb[task_tag];
 	unsigned long flags;
 
 	lrbp->issue_time_stamp = ktime_get();
 	lrbp->compl_time_stamp = ktime_set(0, 0);
-	ufshcd_add_command_trace(hba, task_tag, UFS_CMD_SEND);
+	ufshcd_add_command_trace(hba, lrbp, UFS_CMD_SEND);
 	ufshcd_clk_scaling_start_busy(hba);
 	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);
+		if (hba->vops && hba->vops->setup_xfer_req)
+			hba->vops->setup_xfer_req(hba, lrbp->task_tag,
+						  !!lrbp->cmd);
+		memcpy(hwq->sqe_base_addr + (hwq->sq_tp_slot * utrd_size),
+		       lrbp->utr_descriptor_ptr, utrd_size);
+		ufshcd_inc_tp(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);
+	}
 }
 
 /**
@@ -2239,6 +2264,13 @@ static inline int ufshcd_hba_capabilities(struct ufs_hba *hba)
 	if (err)
 		dev_err(hba->dev, "crypto setup failed\n");
 
+	hba->mcq_sup = (hba->capabilities & MASK_MCQ_SUPPORT) >> 30;
+	if (!hba->mcq_sup)
+		return err;
+
+	hba->mcq_capabilities = ufshcd_readl(hba, REG_MCQCAP);
+	hba->ext_iid_sup = (hba->mcq_capabilities & MASK_EXT_IID_SUPPORT) >> 10;
+
 	return err;
 }
 
@@ -2553,9 +2585,10 @@ void ufshcd_prepare_utp_scsi_cmd_upiu(struct ufshcd_lrb *lrbp, u8 upiu_flags)
 	/* command descriptor fields */
 	ucd_req_ptr->header.dword_0 = UPIU_HEADER_DWORD(
 				UPIU_TRANSACTION_COMMAND, upiu_flags,
-				lrbp->lun, lrbp->task_tag);
+				lrbp->lun, lrbp->task_tag & 0xff);
 	ucd_req_ptr->header.dword_1 = UPIU_HEADER_DWORD(
-				UPIU_COMMAND_SET_TYPE_SCSI, 0, 0, 0);
+				UPIU_COMMAND_SET_TYPE_SCSI, 0, 0,
+				(lrbp->task_tag & 0xF00) << 4);
 
 	/* Total EHS length and Data segment length will be zero */
 	ucd_req_ptr->header.dword_2 = 0;
@@ -2703,25 +2736,26 @@ 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, ret;
+	struct ufs_hba *hba = shost_priv(shost);
 
 	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;
+
+		map->queue_offset = queue_offset;
+		if (i == HCTX_TYPE_POLL && !is_mcq_supported(hba))
+			map->queue_offset = 0;
+
 		ret = blk_mq_map_queues(map);
-		WARN_ON_ONCE(ret);
+
+		if (ret)
+			return ret;
+
+		queue_offset += map->nr_queues;
 	}
 
 	return 0;
@@ -2761,6 +2795,7 @@ 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);
 
@@ -2845,8 +2880,10 @@ static int ufshcd_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd)
 		goto out;
 	}
 
-	ufshcd_send_command(hba, tag);
+	if (is_mcq_enabled(hba))
+		hwq = ufshcd_mcq_find_hwq(hba, scsi_cmd_to_rq(cmd));
 
+	ufshcd_send_command(hba, lrbp, hwq);
 out:
 	rcu_read_unlock();
 
@@ -2963,7 +3000,7 @@ 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);
 	}
@@ -2971,7 +3008,7 @@ static int ufshcd_wait_for_dev_cmd(struct ufs_hba *hba,
 
 	if (!time_left) {
 		err = -ETIMEDOUT;
-		dev_dbg(hba->dev, "%s: dev_cmd request timedout, tag %d\n",
+		dev_err(hba->dev, "%s: dev_cmd request timedout, tag %d\n",
 			__func__, lrbp->task_tag);
 		if (!ufshcd_clear_cmds(hba, 1U << lrbp->task_tag))
 			/* successfully cleared the command, retry if needed */
@@ -3002,7 +3039,7 @@ static int ufshcd_exec_dev_cmd(struct ufs_hba *hba,
 		enum dev_cmd_type cmd_type, int timeout)
 {
 	DECLARE_COMPLETION_ONSTACK(wait);
-	const u32 tag = hba->reserved_slot;
+	u32 tag = hba->reserved_slot;
 	struct ufshcd_lrb *lrbp;
 	int err;
 
@@ -3018,10 +3055,10 @@ 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, lrbp, 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);
@@ -3617,11 +3654,11 @@ static int ufshcd_get_ref_clk_gating_wait(struct ufs_hba *hba)
  * ufshcd_memory_alloc - allocate memory for host memory space data structures
  * @hba: per adapter instance
  *
- * 1. Allocate DMA memory for Command Descriptor array
- *	Each command descriptor consist of Command UPIU, Response UPIU and PRDT
- * 2. Allocate DMA memory for UTP Transfer Request Descriptor List (UTRDL).
- * 3. Allocate DMA memory for UTP Task Management Request Descriptor List
+ * 1. Allocate DMA memory for UTP Task Management Request Descriptor List
  *	(UTMRDL)
+ * 2. Allocate DMA memory for Command Descriptor array
+ *	Each command descriptor consist of Command UPIU, Response UPIU and PRDT
+ * 3. Allocate DMA memory for UTP Transfer Request Descriptor List (UTRDL).
  * 4. Allocate memory for local reference block(lrb).
  *
  * Returns 0 for success, non-zero in case of failure
@@ -3666,6 +3703,8 @@ static int ufshcd_memory_alloc(struct ufs_hba *hba)
 		goto out;
 	}
 
+	if (hba->utmrdl_base_addr)
+		goto skip_utmrdl;
 	/*
 	 * Allocate memory for UTP Task Management descriptors
 	 * UFSHCI requires 1024 byte alignment of UTMRD
@@ -3682,6 +3721,7 @@ 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),
@@ -3695,6 +3735,21 @@ static int ufshcd_memory_alloc(struct ufs_hba *hba)
 	return -ENOMEM;
 }
 
+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);
+}
+
 /**
  * ufshcd_host_memory_configure - configure local reference block with
  *				memory offsets
@@ -3708,7 +3763,7 @@ static int ufshcd_memory_alloc(struct ufs_hba *hba)
  * 3. Save the corresponding addresses of UTRD, UCD.CMD, UCD.RSP and UCD.PRDT
  * into local reference block.
  */
-static void ufshcd_host_memory_configure(struct ufs_hba *hba)
+static int ufshcd_host_memory_configure(struct ufs_hba *hba)
 {
 	struct utp_transfer_req_desc *utrdlp;
 	dma_addr_t cmd_desc_dma_addr;
@@ -3756,6 +3811,8 @@ static void ufshcd_host_memory_configure(struct ufs_hba *hba)
 
 		ufshcd_init_lrb(hba, &hba->lrb[i], i);
 	}
+
+	return 0;
 }
 
 /**
@@ -4508,11 +4565,13 @@ int ufshcd_make_hba_operational(struct ufs_hba *hba)
 	else
 		ufshcd_disable_intr_aggr(hba);
 
-	/* Configure UTRL and UTMRL base address registers */
+	/* Configure UTRL base address registers */
 	ufshcd_writel(hba, lower_32_bits(hba->utrdl_dma_addr),
 			REG_UTP_TRANSFER_REQ_LIST_BASE_L);
 	ufshcd_writel(hba, upper_32_bits(hba->utrdl_dma_addr),
 			REG_UTP_TRANSFER_REQ_LIST_BASE_H);
+
+	/* Configure UTMRL base address registers */
 	ufshcd_writel(hba, lower_32_bits(hba->utmrdl_dma_addr),
 			REG_UTP_TASK_REQ_LIST_BASE_L);
 	ufshcd_writel(hba, upper_32_bits(hba->utmrdl_dma_addr),
@@ -5149,14 +5208,15 @@ ufshcd_scsi_cmd_status(struct ufshcd_lrb *lrbp, int scsi_status)
  * 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) &
@@ -5320,6 +5380,34 @@ static void ufshcd_release_scsi_cmd(struct ufs_hba *hba,
 	ufshcd_clk_scaling_update_busy(hba);
 }
 
+void ufshcd_compl_one_task(struct ufs_hba *hba, int task_tag,
+			  struct cq_entry *cqe)
+{
+	struct ufshcd_lrb *lrbp;
+	struct scsi_cmnd *cmd;
+
+	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, lrbp, 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, lrbp, 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
@@ -5328,32 +5416,10 @@ static void ufshcd_release_scsi_cmd(struct ufs_hba *hba,
 static void __ufshcd_transfer_req_compl(struct ufs_hba *hba,
 					unsigned long completed_reqs)
 {
-	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);
-			}
-		}
-	}
+	int tag;
+
+	for_each_set_bit(tag, &completed_reqs, hba->nutrs)
+		ufshcd_compl_one_task(hba, tag, NULL);
 }
 
 /*
@@ -5363,9 +5429,15 @@ static void __ufshcd_transfer_req_compl(struct ufs_hba *hba,
 static int ufshcd_poll(struct Scsi_Host *shost, unsigned int queue_num)
 {
 	struct ufs_hba *hba = shost_priv(shost);
-	unsigned long completed_reqs, flags;
+	struct ufs_hw_queue *hwq;
+	unsigned long completed_reqs = 0, flags;
 	u32 tr_doorbell;
 
+	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);
 	completed_reqs = ~tr_doorbell & hba->outstanding_reqs;
@@ -5389,7 +5461,7 @@ static int ufshcd_poll(struct Scsi_Host *shost, unsigned int queue_num)
  *  IRQ_HANDLED - If interrupt is valid
  *  IRQ_NONE    - If invalid interrupt
  */
-static irqreturn_t ufshcd_transfer_req_compl(struct ufs_hba *hba)
+irqreturn_t ufshcd_transfer_req_compl(struct ufs_hba *hba)
 {
 	/* Resetting interrupt aggregation counters first and reading the
 	 * DOOR_BELL afterward allows us to handle all the completed requests.
@@ -5413,6 +5485,43 @@ static irqreturn_t ufshcd_transfer_req_compl(struct ufs_hba *hba)
 
 	return IRQ_HANDLED;
 }
+EXPORT_SYMBOL_GPL(ufshcd_transfer_req_compl);
+
+/**
+ * ufshcd_handle_mcq_cq_events - handle MCQ completion queue events
+ * @hba: per adapter instance
+ *
+ * Returns
+ *  IRQ_HANDLED - If interrupt is valid
+ *  IRQ_NONE    - If invalid interrupt
+ */
+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_TEPS)
+			ufshcd_mcq_poll_cqe_nolock(hba, hwq);
+	}
+
+	return IRQ_HANDLED;
+}
 
 int __ufshcd_write_ee_control(struct ufs_hba *hba, u32 ee_ctrl_mask)
 {
@@ -5944,10 +6053,23 @@ static void ufshcd_exception_event_handler(struct work_struct *work)
 	ufshcd_scsi_unblock_requests(hba);
 }
 
-/* Complete requests that have door-bell cleared */
+/*
+ * Complete requests that have door-bell cleared and/or pending completion
+ * entries on completion queues if MCQ is enabled
+ */
 static void ufshcd_complete_requests(struct ufs_hba *hba)
 {
-	ufshcd_transfer_req_compl(hba);
+	struct ufs_hw_queue *hwq;
+	int i;
+
+	if (is_mcq_enabled(hba)) {
+		for_each_hw_queue(hba, i) {
+			hwq = &hba->uhq[i];
+			ufshcd_mcq_poll_cqe_lock(hba, hwq);
+		}
+	} else {
+		ufshcd_transfer_req_compl(hba);
+	}
 	ufshcd_tmc_handler(hba);
 }
 
@@ -6210,7 +6332,6 @@ static void ufshcd_err_handler(struct work_struct *work)
 	ufshcd_set_eh_in_progress(hba);
 	spin_unlock_irqrestore(hba->host->host_lock, flags);
 	ufshcd_err_handling_prepare(hba);
-	/* Complete requests that have door-bell cleared by h/w */
 	ufshcd_complete_requests(hba);
 	spin_lock_irqsave(hba->host->host_lock, flags);
 again:
@@ -6602,6 +6723,9 @@ 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;
 }
 
@@ -6823,7 +6947,7 @@ static int ufshcd_issue_devman_upiu_cmd(struct ufs_hba *hba,
 					enum query_opcode desc_op)
 {
 	DECLARE_COMPLETION_ONSTACK(wait);
-	const u32 tag = hba->reserved_slot;
+	u32 tag = hba->reserved_slot;
 	struct ufshcd_lrb *lrbp;
 	int err = 0;
 	u8 upiu_flags;
@@ -6866,10 +6990,11 @@ static int ufshcd_issue_devman_upiu_cmd(struct ufs_hba *hba,
 	memset(lrbp->ucd_rsp_ptr, 0, sizeof(struct utp_upiu_rsp));
 
 	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, lrbp, 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.
@@ -7664,6 +7789,30 @@ 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;
+
+	if (dev_info->wspecversion < 0x400)
+		goto out;
+
+	ext_ufs_feature = get_unaligned_be32(desc_buf + DEVICE_DESC_PARAM_EXT_UFS_FEATURE_SUP);
+
+	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)
 {
@@ -7725,6 +7874,9 @@ 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];
@@ -7762,6 +7914,8 @@ static int ufs_get_device_desc(struct ufs_hba *hba)
 
 	ufshcd_temp_notif_probe(hba, desc_buf);
 
+	ufshcd_ext_iid_probe(hba, desc_buf);
+
 	/*
 	 * ufshcd_read_string_desc returns size of the string
 	 * reset the error value
@@ -8135,14 +8289,61 @@ static int ufshcd_add_lus(struct ufs_hba *hba)
 	return ret;
 }
 
+static int ufshcd_config_mcq(struct ufs_hba *hba)
+{
+	int old_nutrs = hba->nutrs;
+	int ret;
+	struct Scsi_Host *host = hba->host;
+
+	hba->nutrs = ufshcd_mcq_find_queue_depth(hba);
+	hba->host->can_queue = hba->nutrs - UFSHCD_NUM_RESERVED;
+	hba->reserved_slot = hba->nutrs - 1;
+
+	ret = ufshcd_mcq_init(hba);
+	if (ret) {
+		dev_err(hba->dev, "MCQ init failed %d\n", ret);
+		return ret;
+	}
+
+	if (hba->nutrs != old_nutrs) {
+		ufshcd_release_sdb_queue(hba, old_nutrs);
+		ret = ufshcd_memory_alloc(hba);
+		if (ret)
+			return ret;
+		ufshcd_host_memory_configure(hba);
+	}
+
+	ret = ufshcd_mcq_memory_alloc(hba);
+	if (ret)
+		return ret;
+
+	ret = ufshcd_mcq_vops_config_esi(hba);
+	if (ret) {
+		dev_info(hba->dev, "MCQ ESI not available %d\n", ret);
+		ret = 0;
+	}
+
+	ufshcd_enable_intr(hba, UFSHCD_ENABLE_MCQ_INTRS);
+	ufshcd_mcq_make_queues_operational(hba);
+	ufshcd_mcq_config_mac(hba, hba->nutrs);
+
+	ret = scsi_add_host(host, hba->dev);
+	if (ret)
+		dev_err(hba->dev, "scsi_add_host failed\n");
+	else
+		dev_info(hba->dev, "MCQ configured, nr_queues=%d, queue_depth=%d\n",
+			 hba->nr_hw_queues, hba->nutrs);
+	return ret;
+}
+
 /**
  * ufshcd_probe_hba - probe hba to detect device and initialize it
  * @hba: per-adapter instance
- * @init_dev_params: whether or not to call ufshcd_device_params_init().
+ * @initial_boot: Whether or not from initial bootup
  *
  * Execute link-startup and verify device initialization
  */
-static int ufshcd_probe_hba(struct ufs_hba *hba, bool init_dev_params)
+static int ufshcd_probe_hba(struct ufs_hba *hba, bool initial_boot)
 {
 	int ret;
 	unsigned long flags;
@@ -8177,10 +8378,16 @@ static int ufshcd_probe_hba(struct ufs_hba *hba, bool init_dev_params)
 	 * Initialize UFS device parameters used by driver, these
 	 * parameters are associated with UFS descriptors.
 	 */
-	if (init_dev_params) {
+	if (initial_boot) {
 		ret = ufshcd_device_params_init(hba);
 		if (ret)
 			goto out;
+
+		if (is_mcq_supported(hba)) {
+			ret = ufshcd_config_mcq(hba);
+			if (ret)
+				goto out;
+		}
 	}
 
 	ufshcd_tune_unipro_params(hba);
@@ -9654,6 +9861,14 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq)
 		goto out_disable;
 	}
 
+	if (!is_mcq_supported(hba)) {
+		/* Refer ufshcd_map_queues() */
+		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;
+	}
+
 	/* Allocate memory for host memory space */
 	err = ufshcd_memory_alloc(hba);
 	if (err) {
@@ -9727,10 +9942,13 @@ 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)) {
+		/* Refer ufshcd_config_mcq() */
+		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) {
diff --git a/include/ufs/ufs.h b/include/ufs/ufs.h
index 1bba3fe..f59cc27 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
 
@@ -589,6 +591,7 @@ struct ufs_dev_info {
 	u8	*model;
 	u16	wspecversion;
 	u32	clk_gating_wait_us;
+	u8	bqueuedepth;
 
 	/* UFS HPB related flag */
 	bool	hpb_enabled;
@@ -601,6 +604,8 @@ struct ufs_dev_info {
 
 	bool	b_rpm_dev_flush_capable;
 	u8	b_presrv_uspc_en;
+
+	bool	b_ext_iid_en;
 };
 
 /*
diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h
index 7fe1a92..a195663 100644
--- a/include/ufs/ufshcd.h
+++ b/include/ufs/ufshcd.h
@@ -22,6 +22,7 @@
 #include <ufs/ufs.h>
 #include <ufs/ufs_quirks.h>
 #include <ufs/ufshci.h>
+#include <linux/msi.h>
 
 #define UFSHCD "ufshcd"
 
@@ -218,6 +219,7 @@ struct ufs_dev_cmd {
 	struct mutex lock;
 	struct completion *complete;
 	struct ufs_query query;
+	struct cq_entry *cqe;
 };
 
 /**
@@ -293,6 +295,9 @@ 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_outstanding_cqs: called to get outstanding completion queues
+ * @config_mcq_rop: called to config Runtime Operation Pointers
+ * @config_mcq_esi: called to config MCQ ESI handlers
  */
 struct ufs_hba_variant_ops {
 	const char *name;
@@ -331,6 +336,11 @@ 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_outstanding_cqs)(struct ufs_hba *hba,
+				       unsigned long *ocqs);
+	int	(*config_mcq_rop)(struct ufs_hba *hba);
+	int	(*config_mcq_esi)(struct ufs_hba *hba);
+	int	(*get_hba_mac)(struct ufs_hba *hba);
 };
 
 /* clock gating state  */
@@ -713,6 +723,39 @@ struct ufs_hba_monitor {
 	bool enabled;
 };
 
+struct ufshcd_res_info_t {
+	char *name;
+	struct resource *resource;
+	bool is_alloc;
+	void __iomem *base;
+};
+
+enum ufshcd_res {
+	RES_MEM,
+	RES_MCQ,
+	RES_MCQ_SQD,
+	RES_MCQ_SQIS,
+	RES_MCQ_CQD,
+	RES_MCQ_CQIS,
+	RES_MCQ_VS,
+	RES_MAX,
+};
+
+/* MCQ Runtime Operation Pointer info structure */
+struct ufshcd_mcq_rop_info_t {
+	unsigned long offset;
+	unsigned long stride;
+	void __iomem *base;
+};
+
+enum ufshcd_mcq_rop {
+	ROP_SQD,
+	ROP_SQIS,
+	ROP_CQD,
+	ROP_CQIS,
+	ROP_MAX,
+};
+
 /**
  * struct ufs_hba - per adapter private structure
  * @mmio_base: UFSHCI base register address
@@ -737,6 +780,7 @@ struct ufs_hba_monitor {
  * @outstanding_lock: Protects @outstanding_reqs.
  * @outstanding_reqs: Bits representing outstanding transfer requests
  * @capabilities: UFS Controller Capabilities
+ * @mcq_capabilities: UFS Multi Command 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 +862,13 @@ struct ufs_hba_monitor {
  *	device
  * @complete_put: whether or not to call ufshcd_rpm_put() from inside
  *	ufshcd_resume_complete()
+ * @uhq: array of supported hardware queues
+ * @mcq_base: Multi command queue registers base address
+ * @ucd_pool: dma pool of UCD descriptors
+ * @dao_offset: value used to calculate the SQ and CQ DAO
+ * @use_mcq: track if MCQ is enabled
+ * @mcq_sup: track if MCQ is supported by UFSHC
+ * @ext_iid_sup: EXT_IID support by UFS device
  */
 struct ufs_hba {
 	void __iomem *mmio_base;
@@ -858,6 +909,7 @@ struct ufs_hba {
 	unsigned long outstanding_reqs;
 
 	u32 capabilities;
+	u32 mcq_capabilities;
 	int nutrs;
 	int nutmrs;
 	u32 reserved_slot;
@@ -965,8 +1017,119 @@ struct ufs_hba {
 #endif
 	u32 luns_avail;
 	bool complete_put;
+	struct ufs_hw_queue *uhq;
+	struct ufs_hw_queue *dev_cmd_queue;
+	unsigned int nr_queues[HCTX_MAX_TYPES];
+	unsigned int nr_hw_queues;
+	void __iomem *mcq_base;
+	struct ufshcd_res_info_t res[RES_MAX];
+	struct ufshcd_mcq_rop_info_t mcq_rop[ROP_MAX];
+	struct dma_pool *ucd_pool;
+	u32 dao_offset;
+	bool use_mcq;
+	bool mcq_sup;
+	bool ext_iid_sup;
 };
 
+enum {
+	ESIVEC_CQ,
+	ESIVEC_SQ,
+	ESIVEC_MAX,
+};
+
+/**
+ * @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
+ * @mcq_sq_hp: base address of submission queue head pointer
+ * @mcq_sq_tp: base address of submission queue tail pointer
+ * @mcq_cq_hp: base address of completion queue head pointer
+ * @mcq_cq_tp: base address of completion queue tail pointer
+ * @sq_lock: lock to protect submission queue head/tail pointer and slot update
+ * @sq_tp_slot: current slot to which SQ tail pointer is pointing
+ * @cq_lock: lock to protect completion queue head/tail pointer and slot update
+ * @cq_tp_slot: current slot to which CQ tail pointer is pointing
+ * @cq_hp_slot: current slot to which CQ head pointer is pointing
+ */
+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;
+	u32 id;
+
+	void __iomem *mcq_sq_hp;
+	void __iomem *mcq_sq_tp;
+	void __iomem *mcq_cq_hp;
+	void __iomem *mcq_cq_tp;
+
+	spinlock_t sq_lock;
+	u32 sq_tp_slot;
+	spinlock_t cq_lock;
+	u32 cq_tp_slot;
+	u32 cq_hp_slot;
+};
+
+#define for_each_hw_queue(hba, i) \
+	for ((i) = 0; (i) < (hba)->nr_hw_queues; (i)++)
+
+#define UFSHCD_MCQ_IO_QUEUE_OFFSET	1
+
+static inline bool is_mcq_enabled(struct ufs_hba *hba)
+{
+	return hba->use_mcq;
+}
+
+static inline bool is_mcq_supported(struct ufs_hba *hba)
+{
+	return hba->mcq_sup;
+}
+
+static inline void ufshcd_inc_tp(struct ufs_hw_queue *q)
+{
+	u32 next_slot = ((q->sq_tp_slot + 1) % q->max_entries);
+	u32 val = next_slot * sizeof(struct utp_transfer_req_desc);
+
+	q->sq_tp_slot = next_slot;
+
+	writel(val, q->mcq_sq_tp);
+}
+
+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_hp_slot;
+}
+
+static inline bool ufshcd_mcq_is_cq_empty(struct ufs_hw_queue *q)
+{
+	return q->cq_hp_slot == q->cq_tp_slot;
+}
+
+static inline void ufshcd_mcq_inc_cq_hp_slot(struct ufs_hw_queue *q)
+{
+	q->cq_hp_slot++;
+	if (q->cq_hp_slot == q->max_entries)
+		q->cq_hp_slot = 0;
+}
+
+static inline void ufshcd_mcq_update_cq_hp(struct ufs_hw_queue *q)
+{
+	writel(q->cq_hp_slot * sizeof(struct cq_entry), q->mcq_cq_hp);
+}
+
+static inline void ufshcd_mcq_update_cq_tp_slot(struct ufs_hw_queue *q)
+{
+	u32 val = readl(q->mcq_cq_tp);
+
+	q->cq_tp_slot = val / sizeof(struct cq_entry);
+}
+
 /* Returns true if clocks can be gated. Otherwise false */
 static inline bool ufshcd_is_clkgating_allowed(struct ufs_hba *hba)
 {
@@ -1017,11 +1180,16 @@ static inline bool ufshcd_is_wb_allowed(struct ufs_hba *hba)
 	return hba->caps & UFSHCD_CAP_WB_EN;
 }
 
-#define ufshcd_writel(hba, val, reg)	\
+#define ufshcd_writel(hba, val, reg)		\
 	writel((val), (hba)->mmio_base + (reg))
 #define ufshcd_readl(hba, reg)	\
 	readl((hba)->mmio_base + (reg))
 
+#define ufsmcq_writel(hba, val, reg)	\
+	writel((val), (hba)->mcq_base + (reg))
+#define ufsmcq_readl(hba, reg)	\
+	readl((hba)->mcq_base + (reg))
+
 /**
  * ufshcd_rmwl - perform read/modify/write for a controller register
  * @hba: per adapter instance
@@ -1100,6 +1268,26 @@ extern int ufshcd_dme_get_attr(struct ufs_hba *hba, u32 attr_sel,
 extern int ufshcd_config_pwr_mode(struct ufs_hba *hba,
 			struct ufs_pa_layer_attr *desired_pwr_mode);
 extern int ufshcd_uic_change_pwr_mode(struct ufs_hba *hba, u8 mode);
+extern void ufshcd_compl_one_task(struct ufs_hba *hba, int task_tag,
+				  struct cq_entry *cqe);
+extern int ufshcd_mcq_init(struct ufs_hba *hba);
+extern void ufshcd_mcq_enable(struct ufs_hba *hba);
+extern int ufshcd_mcq_memory_alloc(struct ufs_hba *hba);
+extern void ufshcd_mcq_config_mac(struct ufs_hba *hba, u32 set);
+extern u32 ufshcd_mcq_read_cqis(struct ufs_hba *hba, int i);
+extern void ufshcd_mcq_write_cqis(struct ufs_hba *hba, u32 val, int i);
+extern void ufshcd_mcq_enable_cq_intr(struct ufs_hba *hba, u32 intrs);
+extern void ufshcd_mcq_disable_cq_intr(struct ufs_hba *hba, u32 intrs);
+extern void ufshcd_mcq_enable_esi(struct ufs_hba *hba);
+extern void ufshcd_mcq_config_esi(struct ufs_hba *hba, struct msi_msg *msg);
+extern unsigned long ufshcd_mcq_poll_cqe_nolock(struct ufs_hba *hba,
+						struct ufs_hw_queue *hwq);
+extern unsigned long ufshcd_mcq_poll_cqe_lock(struct ufs_hba *hba,
+					      struct ufs_hw_queue *hwq);
+extern void ufshcd_mcq_make_queues_operational(struct ufs_hba *hba);
+extern struct ufs_hw_queue *ufshcd_mcq_find_hwq(struct ufs_hba *hba,
+						struct request *req);
+extern u32 ufshcd_mcq_find_queue_depth(struct ufs_hba *hba);
 
 /* UIC command interfaces for DME primitives */
 #define DME_LOCAL	0
@@ -1232,6 +1420,39 @@ static inline int ufshcd_vops_phy_initialization(struct ufs_hba *hba)
 	return 0;
 }
 
+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;
+}
+
+static inline int ufshcd_mcq_vops_config_rop(struct ufs_hba *hba)
+{
+	if (hba->vops && hba->vops->config_mcq_rop)
+		return hba->vops->config_mcq_rop(hba);
+
+	return -EOPNOTSUPP;
+}
+
+static inline int ufshcd_mcq_vops_config_esi(struct ufs_hba *hba)
+{
+	if (hba->vops && hba->vops->config_mcq_esi)
+		return hba->vops->config_mcq_esi(hba);
+
+	return -EOPNOTSUPP;
+}
+
+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[];
 
 int ufshcd_dump_regs(struct ufs_hba *hba, size_t offset, size_t len,
diff --git a/include/ufs/ufshci.h b/include/ufs/ufshci.h
index f81aa95..6ca29ae 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,
@@ -56,6 +57,10 @@ enum {
 	REG_UFS_CCAP				= 0x100,
 	REG_UFS_CRYPTOCAP			= 0x104,
 
+	REG_UFS_MEM_CFG				= 0x300,
+	REG_UFS_MCQ_CFG				= 0x380,
+	REG_UFS_ESILBA				= 0x384,
+	REG_UFS_ESIUBA				= 0x388,
 	UFSHCI_CRYPTO_REG_SPACE_SIZE		= 0x400,
 };
 
@@ -68,6 +73,53 @@ 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,
+	MASK_ROUND_ROBIN_PRI_SUPP = 0x00000200,
+};
+
+enum {
+	REG_SQATTR		= 0x0,
+	REG_SQLBA		= 0x4,
+	REG_SQUBA		= 0x8,
+	REG_SQDAO		= 0xC,
+	REG_SQISAO		= 0x10,
+	REG_SQCFG		= 0x14,
+
+	REG_CQATTR		= 0x20,
+	REG_CQLBA		= 0x24,
+	REG_CQUBA		= 0x28,
+	REG_CQDAO		= 0x2C,
+	REG_CQISAO		= 0x30,
+	REG_CQCFG		= 0x34,
+};
+
+enum {
+	REG_SQHP		= 0x0,
+	REG_SQTP		= 0x4,
+	REG_SQRTC		= 0x8,
+	REG_SQCTI		= 0xC,
+	REG_SQRTS		= 0x10,
+};
+
+enum {
+	REG_SQIS		= 0x0,
+	REG_SQIE		= 0x4,
+};
+
+enum {
+	REG_CQHP		= 0x0,
+	REG_CQTP		= 0x4,
+};
+
+enum {
+	REG_CQIS		= 0x0,
+	REG_CQIE		= 0x4,
+	REG_MCQIACR		= 0x8,
 };
 
 #define UFS_MASK(mask, offset)		((mask) << (offset))
@@ -126,6 +178,8 @@ 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_SQ_EVENT_STATUS			0x80000
+#define MCQ_CQ_EVENT_STATUS			0x100000
 
 #define UFSHCD_UIC_HIBERN8_MASK	(UIC_HIBERNATE_ENTER |\
 				UIC_HIBERNATE_EXIT)
@@ -227,6 +281,9 @@ 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_TEPS	0x1
+
 /* UICCMD - UIC Command */
 #define COMMAND_OPCODE_MASK		0xFF
 #define GEN_SELECTOR_INDEX_MASK		0xFFFF
@@ -482,6 +539,26 @@ struct utp_transfer_req_desc {
 	__le16  prd_table_offset;
 };
 
+struct cq_entry {
+	/* DW 0-1 */
+	__le32 command_desc_base_addr_lo;
+	__le32 command_desc_base_addr_hi;
+
+	/* 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];
+};
+
 /*
  * UTMRD structure.
  */
-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.

Re: [RFC PATCH v2 1/2] scsi: ufs: Add Multi-Circular Queue support

[Manivannan Sadhasivam]

On Thu, Aug 11, 2022 at 03:33:03AM -0700, Can Guo wrote:
> From: Asutosh Das <quic_asutoshd@quicinc.com>
> 
> Adds MCQ support to UFS.
> 
> The design uses shared tags across all the hw queues.
> The queue-depth is chosen within range supported by controller &
> device. It also takes EXT_IID into account while choosing the queue
> depth.
> 
> It supports default, read, poll and a dev cmd queue.
> It enables MCQ after determining the queue-depth that the ufs
> device supports.
> 
> Co-developed-by: Can Guo <quic_cang@quicinc.com>

As per the Documentation, "Co-developed-by" should be followed by
"Signed-off-by" of the author. So you can just move this "Co-developed-by"
below Asutosh's S-o-b and that should be fine.

> Signed-off-by: Asutosh Das <quic_asutoshd@quicinc.com>
> Signed-off-by: Can Guo <quic_cang@quicinc.com>
> ---
>  drivers/ufs/core/Makefile  |   2 +-
>  drivers/ufs/core/ufs-mcq.c | 524 +++++++++++++++++++++++++++++++++++++++++++++
>  drivers/ufs/core/ufshcd.c  | 394 ++++++++++++++++++++++++++--------
>  include/ufs/ufs.h          |   5 +
>  include/ufs/ufshcd.h       | 223 ++++++++++++++++++-
>  include/ufs/ufshci.h       |  77 +++++++
>  6 files changed, 1135 insertions(+), 90 deletions(-)

This patch is too big to review. Could you please split it into multiple
patches?

>  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..9d87153
> --- /dev/null
> +++ b/drivers/ufs/core/ufs-mcq.c
> @@ -0,0 +1,524 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Copyright (c) 2022, Linux Foundation. All rights reserved.

I think you need to add a new Copyright for quicinc.

> + *
> + * Authors:
> + *	Asutosh Das <quic_asutoshd@quicinc.com>
> + *	Can Guo <quic_cang@quicinc.com>
> + */
> +
> +#include <linux/platform_device.h>
> +#include <linux/dma-mapping.h>
> +#include <linux/module.h>
> +#include <asm/unaligned.h>
> +
> +#include <ufs/ufshcd.h>
> +

Please sort the includes alphabetically.

> +#define MCQ_CFG_MAC_OFFSET	8
> +#define MCQ_CFG_MAC_MASK	UFS_MASK(0x1FF, MCQ_CFG_MAC_OFFSET)

Please use lowercase for hex

> +
> +#define MCQ_QCFGPTR_MASK	0xff
> +#define MCQ_QCFGPTR_UNIT	0x200
> +#define mcq_sqattr_offset(c) \
> +	((((c) >> 16) & MCQ_QCFGPTR_MASK) * MCQ_QCFGPTR_UNIT)
> +
> +#define MCQ_ENTRY_SIZE_IN_DWORD	8
> +#define MCQ_QCFG_SIZE	0x40
> +
> +static unsigned int dev_cmd_queue = 1;
> +static unsigned int read_queues;

Where is this initialized?

> +static unsigned int poll_queues = 1;

Since these are the default sizes, this could be best defined as a define
instead of a variable.

> +
> +static int rw_queue_count_set(const char *val, const struct kernel_param *kp)
> +{
> +	unsigned int n;
> +	int ret;
> +
> +	ret = kstrtouint(val, 10, &n);
> +	if (ret)
> +		return ret;
> +	if (n > num_possible_cpus())
> +		return -EINVAL;
> +	return param_set_uint(val, kp);
> +}
> +
> +static const struct kernel_param_ops rw_queue_count_ops = {
> +	.set = rw_queue_count_set,
> +	.get = param_get_uint,
> +};
> +
> +static unsigned int rw_queues = 8;
> +module_param_cb(rw_queues, &rw_queue_count_ops, &rw_queues, 0644);
> +MODULE_PARM_DESC(rw_queues, "Number of queues used for rw. Default value is 8");
> +

Using module params is not encouraged these days. So please switch to Kconfig.

> +/* resources */
> +static const struct ufshcd_res_info_t ufshcd_res_info[RES_MAX] = {
> +	{"ufs_mem", NULL, NULL},
> +	{"mcq", NULL, NULL},
> +	{"mcq_sqd", NULL, NULL},
> +	{"mcq_sqis", NULL, NULL},
> +	{"mcq_cqd", NULL, NULL},
> +	{"mcq_cqis", NULL, NULL},
> +	{"mcq_vs", NULL, NULL},

These resources also need a devicetree binding change, isn't it?

> +};
> +
> +u32 ufshcd_mcq_find_queue_depth(struct ufs_hba *hba)
> +{
> +	u32 qd, val, mac;

s/qd/depth

> +
> +	val = ufshcd_readl(hba, REG_UFS_MCQ_CFG);

This could be moved inside the if() condition below to avoid reading the
register if platform provides the MAC value.

> +	mac = ufshcd_mcq_vops_get_hba_mac(hba);
> +	if (mac < 0)
> +		mac = (val & MCQ_CFG_MAC_MASK) >> MCQ_CFG_MAC_OFFSET;

Use bitfield macros here and throughout the driver where applicable.

> +
> +	/*  MAC is a 0 based value. */
> +	mac += 1;
> +	qd = min_t(u32, mac, hba->dev_info.bqueuedepth);
> +	if (!qd)
> +		qd = mac;
> +
> +	/* Adjust queue depth based on ext_iid support. */
> +	if (qd > 256 && (!hba->ext_iid_sup || !hba->dev_info.b_ext_iid_en))
> +		qd = 256;
> +	if (qd > 4096 && hba->ext_iid_sup && hba->dev_info.b_ext_iid_en)
> +		qd = 4096;
> +
> +	return qd;
> +}
> +EXPORT_SYMBOL_GPL(ufshcd_mcq_find_queue_depth);

Is this API used outside of this driver? If not, then there is no need to
export it. This seems to be the case for below APIs as well. Please audit
all of them.

If you think that the APIs might be needed for other drivers in the future,
then at that time, they can be exported.

> +
> +void ufshcd_mcq_config_mac(struct ufs_hba *hba, u32 set)
> +{
> +	u32 val;
> +
> +	val = ufshcd_readl(hba, REG_UFS_MCQ_CFG);
> +	val &= ~MCQ_CFG_MAC_MASK;
> +	val |= set << MCQ_CFG_MAC_OFFSET;
> +	ufshcd_writel(hba, val, REG_UFS_MCQ_CFG);
> +}
> +EXPORT_SYMBOL_GPL(ufshcd_mcq_config_mac);
> +
> +struct ufs_hw_queue *ufshcd_mcq_find_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);
> +
> +	return &hba->uhq[hwq + UFSHCD_MCQ_IO_QUEUE_OFFSET];
> +}
> +EXPORT_SYMBOL_GPL(ufshcd_mcq_find_hwq);
> +
> +int ufshcd_mcq_memory_alloc(struct ufs_hba *hba)
> +{
> +	struct ufs_hw_queue *hwq;
> +	size_t utrdl_size, cqe_size;
> +	int i;
> +
> +	for_each_hw_queue(hba, 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 || WARN_ON(hwq->sqe_dma_addr &
> +						  (PAGE_SIZE - 1))) {
> +			dev_err(hba->dev, "Alloc SQE failed\n");

SQE allocation failed?

> +			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 || WARN_ON(hwq->cqe_dma_addr &
> +						  (PAGE_SIZE - 1))) {
> +			dev_err(hba->dev, "Alloc CQE failed\n");

CQE allocation failed?

> +			return -ENOMEM;
> +		}
> +	}
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(ufshcd_mcq_memory_alloc);
> +
> +#define MCQ_CFG_n(r, i) \
> +	((r) + MCQ_QCFG_SIZE * (i))
> +#define MCQ_ROP_OFFSET_n(p, i) \
> +	(hba->mcq_rop[(p)].offset + hba->mcq_rop[(p)].stride * (i))
> +
> +static inline void __iomem *mcq_rop_base(struct ufs_hba *hba,
> +					 enum ufshcd_mcq_rop n, int i)

No inline please... compiler should do it if it sees fit.

> +{
> +	struct ufshcd_mcq_rop_info_t *rop = &hba->mcq_rop[n];
> +
> +	return rop->base + rop->stride * i;
> +}
> +
> +void ufshcd_mcq_make_queues_operational(struct ufs_hba *hba)
> +{
> +	struct ufs_hw_queue *hwq;
> +	u16 qsize;
> +	int i;
> +
> +	for_each_hw_queue(hba, i) {
> +		hwq = &hba->uhq[i];
> +		hwq->id = i;
> +		qsize = hwq->max_entries * MCQ_ENTRY_SIZE_IN_DWORD - 1;
> +
> +		/* SQLBA */
> +		ufsmcq_writel(hba, lower_32_bits(hwq->sqe_dma_addr),
> +			      MCQ_CFG_n(REG_SQLBA, i));
> +		/* SQUBA */
> +		ufsmcq_writel(hba, upper_32_bits(hwq->sqe_dma_addr),
> +			      MCQ_CFG_n(REG_SQUBA, i));
> +		/* SQDAO */
> +		ufsmcq_writel(hba, MCQ_ROP_OFFSET_n(ROP_SQD, i),
> +			      MCQ_CFG_n(REG_SQDAO, i));
> +		/* SQISAO */
> +		ufsmcq_writel(hba, MCQ_ROP_OFFSET_n(ROP_SQIS, i),
> +			      MCQ_CFG_n(REG_SQISAO, i));
> +
> +		/* CQLBA */
> +		ufsmcq_writel(hba, lower_32_bits(hwq->cqe_dma_addr),
> +			      MCQ_CFG_n(REG_CQLBA, i));
> +		/* CQUBA */
> +		ufsmcq_writel(hba, upper_32_bits(hwq->cqe_dma_addr),
> +			      MCQ_CFG_n(REG_CQUBA, i));
> +		/* CQDAO */
> +		ufsmcq_writel(hba, MCQ_ROP_OFFSET_n(ROP_CQD, i),
> +			      MCQ_CFG_n(REG_CQDAO, i));
> +		/* CQISAO */
> +		ufsmcq_writel(hba, MCQ_ROP_OFFSET_n(ROP_CQIS, i),
> +			      MCQ_CFG_n(REG_CQISAO, i));
> +
> +		/* Save the base addresses for quicker access */
> +		hwq->mcq_sq_hp = mcq_rop_base(hba, ROP_SQD, i) + REG_SQHP;
> +		hwq->mcq_sq_tp = mcq_rop_base(hba, ROP_SQD, i) + REG_SQTP;
> +		hwq->mcq_cq_hp = mcq_rop_base(hba, ROP_CQD, i) + REG_CQHP;
> +		hwq->mcq_cq_tp = mcq_rop_base(hba, ROP_CQD, i) + REG_CQTP;
> +
> +		/* enable CQIE.TEPS interrupt only for non-poll queues */
> +		if (i < hba->nr_hw_queues - hba->nr_queues[HCTX_TYPE_POLL])
> +			writel(1, mcq_rop_base(hba, ROP_CQIS, i) + REG_CQIE);
> +
> +		/* cqen|size */
> +		ufsmcq_writel(hba, (1 << 31) | qsize, MCQ_CFG_n(REG_CQATTR, i));
> +
> +		/* sqen|size|cqid */
> +		ufsmcq_writel(hba, (1 << 31) | qsize | (i << 16),
> +			      MCQ_CFG_n(REG_SQATTR, i));

If you are writing to the same memory region, like in this case "mcq_base",
then you should be able to use _relaxed variants as the writes to the same
device memory are guaranteed to be in-order.

This also removes the overhead associated with __iowmb included in writel.

Please audit this change throught the driver and use _relaxed variants where
applicable.

> +	}
> +}
> +EXPORT_SYMBOL_GPL(ufshcd_mcq_make_queues_operational);
> +
> +static void ufshcd_mcq_release_resource(struct ufs_hba *hba)
> +{
> +	struct ufshcd_res_info_t *res;
> +	int i;
> +
> +	for (i = RES_MCQ; i < RES_MAX; i++) {
> +		res = &hba->res[i];
> +
> +		if (res->base) {
> +			devm_iounmap(hba->dev, res->base);
> +			res->base = NULL;
> +		}
> +
> +		if (res->is_alloc)
> +			devm_kfree(hba->dev, res->resource);

I see that this function is called only in error path. Is there any reason to
free the managed allocation explicitly?

> +	}
> +}
> +
> +static int ufshcd_mcq_config_resource(struct ufs_hba *hba)
> +{
> +	struct platform_device *pdev = to_platform_device(hba->dev);
> +	struct ufshcd_res_info_t *res;
> +	struct resource *res_mem, *res_mcq;
> +	int i, ret = 0;
> +
> +	memcpy(hba->res, ufshcd_res_info, sizeof(ufshcd_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 you have the platform_get_resource_byname() out of the for-loop just to get
the "ufs_mem" resource alone, then you can simplify this for-loop with rest of
the resources.

> +		if (!res->resource) {
> +			dev_err(hba->dev, "Resource %s not provided\n");

You didn't pass resource to dev_err.

> +			if (i == RES_MEM)
> +				return -ENOMEM;
> +			continue;
> +		} else if (i == RES_MEM) {
> +			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, PTR_ERR(res->base));
> +			res->base = NULL;
> +			ret = PTR_ERR(res->base);
> +			goto out_err;
> +		}
> +	}
> +
> +	res = &hba->res[RES_MCQ];
> +	/* MCQ resource provided */

MCQ resource provided by the platform

> +	if (res->base)
> +		goto out;
> +
> +	/* Manually allocate MCQ resource */
> +	res_mcq = res->resource;
> +	res_mcq = devm_kzalloc(hba->dev, sizeof(*res_mcq), GFP_KERNEL);
> +	if (!res_mcq) {
> +		dev_err(hba->dev, "Failed to alloate MCQ resource\n");
> +		goto out_err;
> +	}
> +	res->is_alloc = true;
> +
> +	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 %d\n", ret);
> +		goto out_err;
> +	}
> +
> +	res->base = devm_ioremap_resource(hba->dev, res_mcq);
> +	if (IS_ERR(res->base)) {
> +		dev_err(hba->dev, "Map MCQ registers failed, err=%d\n",
> +			PTR_ERR(res->base));
> +		ret = PTR_ERR(res->base);
> +		res->base = NULL;
> +		goto out_err;
> +	}
> +
> +out:
> +	hba->mcq_base = res->base;
> +	return 0;

This looks odd. Move this into the caller.

> +
> +out_err:
> +	ufshcd_mcq_release_resource(hba);
> +	return ret;
> +}
> +

[....]

> +static inline int ufshcd_mcq_get_tag(struct ufs_hba *hba,
> +				     struct ufs_hw_queue *hwq,
> +				     struct cq_entry *cqe)
> +{
> +	dma_addr_t dma_addr;
> +
> +	dma_addr = ((u64)le32_to_cpu(cqe->command_desc_base_addr_hi) << 32) |
> +		   (le32_to_cpu(cqe->command_desc_base_addr_lo) & 0xffffff80);

Define the mask

> +
> +	return (dma_addr - hba->ucdl_dma_addr) /
> +		sizeof_utp_transfer_cmd_desc(hba);
> +}
> +

[...]

> +/**
> + * @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
> + * @mcq_sq_hp: base address of submission queue head pointer
> + * @mcq_sq_tp: base address of submission queue tail pointer
> + * @mcq_cq_hp: base address of completion queue head pointer
> + * @mcq_cq_tp: base address of completion queue tail pointer
> + * @sq_lock: lock to protect submission queue head/tail pointer and slot update
> + * @sq_tp_slot: current slot to which SQ tail pointer is pointing
> + * @cq_lock: lock to protect completion queue head/tail pointer and slot update
> + * @cq_tp_slot: current slot to which CQ tail pointer is pointing
> + * @cq_hp_slot: current slot to which CQ head pointer is pointing
> + */
> +struct ufs_hw_queue {
> +	void *sqe_base_addr;

s/sqe_base_addr/sqe_base

> +	dma_addr_t sqe_dma_addr;

s/sqe_dma_addr/sqe_dma

> +	struct cq_entry *cqe_base_addr;

s/cqe_base_addr/cqe_base

> +	dma_addr_t cqe_dma_addr;

s/cqe_dma_addr/cqe_dma

> +	u32 max_entries;
> +	u32 id;
> +
> +	void __iomem *mcq_sq_hp;
> +	void __iomem *mcq_sq_tp;
> +	void __iomem *mcq_cq_hp;
> +	void __iomem *mcq_cq_tp;

Move these pointers to the top of the struct to avoid any holes.

> +
> +	spinlock_t sq_lock;
> +	u32 sq_tp_slot;
> +	spinlock_t cq_lock;
> +	u32 cq_tp_slot;
> +	u32 cq_hp_slot;
> +};
> +

[...]

>  /* Returns true if clocks can be gated. Otherwise false */
>  static inline bool ufshcd_is_clkgating_allowed(struct ufs_hba *hba)
>  {
> @@ -1017,11 +1180,16 @@ static inline bool ufshcd_is_wb_allowed(struct ufs_hba *hba)
>  	return hba->caps & UFSHCD_CAP_WB_EN;
>  }
>  
> -#define ufshcd_writel(hba, val, reg)	\
> +#define ufshcd_writel(hba, val, reg)		\

spurious change?

>  	writel((val), (hba)->mmio_base + (reg))
>  #define ufshcd_readl(hba, reg)	\
>  	readl((hba)->mmio_base + (reg))
>  
> +#define ufsmcq_writel(hba, val, reg)	\
> +	writel((val), (hba)->mcq_base + (reg))
> +#define ufsmcq_readl(hba, reg)	\
> +	readl((hba)->mcq_base + (reg))
> +

[...]

> @@ -482,6 +539,26 @@ struct utp_transfer_req_desc {
>  	__le16  prd_table_offset;
>  };
>  
> +struct cq_entry {
> +	/* DW 0-1 */
> +	__le32 command_desc_base_addr_lo;
> +	__le32 command_desc_base_addr_hi;
> +
> +	/* 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];
> +};

packed?

I've left reviewing some portions of the code. I'll do a thorough review with
your next version.

Thanks,
Mani

> +
>  /*
>   * UTMRD structure.
>   */
> -- 
> Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.
> 

-- 
மணிவண்ணன் சதாசிவம்

Re: [RFC PATCH v2 1/2] scsi: ufs: Add Multi-Circular Queue support

[Bart Van Assche]

On 8/12/22 02:10, Manivannan Sadhasivam wrote:
> On Thu, Aug 11, 2022 at 03:33:03AM -0700, Can Guo wrote:
>> +static unsigned int dev_cmd_queue = 1;
>> +static unsigned int read_queues;
> 
> Where is this initialized?

The Linux kernel coding style does not allow to explicitly initialize 
static variables to zero.

>> +
>> +static int rw_queue_count_set(const char *val, const struct kernel_param *kp)
>> +{
>> +	unsigned int n;
>> +	int ret;
>> +
>> +	ret = kstrtouint(val, 10, &n);
>> +	if (ret)
>> +		return ret;
>> +	if (n > num_possible_cpus())
>> +		return -EINVAL;
>> +	return param_set_uint(val, kp);
>> +}
>> +
>> +static const struct kernel_param_ops rw_queue_count_ops = {
>> +	.set = rw_queue_count_set,
>> +	.get = param_get_uint,
>> +};
>> +
>> +static unsigned int rw_queues = 8;
>> +module_param_cb(rw_queues, &rw_queue_count_ops, &rw_queues, 0644);
>> +MODULE_PARM_DESC(rw_queues, "Number of queues used for rw. Default value is 8");
>> +
> 
> Using module params is not encouraged these days. So please switch to Kconfig.

Hmm ... I think using CONFIG_* variables is worse than using module 
parameters since modifying CONFIG_* variables requires rebuilding the 
kernel.

>> +struct cq_entry {
>> +	/* DW 0-1 */
>> +	__le32 command_desc_base_addr_lo;
>> +	__le32 command_desc_base_addr_hi;
>> +
>> +	/* 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];
>> +};
> 
> packed?

Using __packed if it is not necessary is wrong since it makes code slower.

Thanks,

Bart.

Re: [RFC PATCH v2 1/2] scsi: ufs: Add Multi-Circular Queue support

[Asutosh Das (asd)]

Hello Manivannan,

Thanks for taking a look.

Sorry for the late reponse, was a bit caught up.

On 8/12/2022 2:10 AM, Manivannan Sadhasivam wrote:
> On Thu, Aug 11, 2022 at 03:33:03AM -0700, Can Guo wrote:
>> From: Asutosh Das <quic_asutoshd@quicinc.com>
>>
>> Adds MCQ support to UFS.
>>
>> The design uses shared tags across all the hw queues.
>> The queue-depth is chosen within range supported by controller &
>> device. It also takes EXT_IID into account while choosing the queue
>> depth.
>>
>> It supports default, read, poll and a dev cmd queue.
>> It enables MCQ after determining the queue-depth that the ufs
>> device supports.
>>
>> Co-developed-by: Can Guo <quic_cang@quicinc.com>
> 
> As per the Documentation, "Co-developed-by" should be followed by
> "Signed-off-by" of the author. So you can just move this "Co-developed-by"
> below Asutosh's S-o-b and that should be fine.
> 
Ok.
>> Signed-off-by: Asutosh Das <quic_asutoshd@quicinc.com>
>> Signed-off-by: Can Guo <quic_cang@quicinc.com>
>> ---
>>   drivers/ufs/core/Makefile  |   2 +-
>>   drivers/ufs/core/ufs-mcq.c | 524 +++++++++++++++++++++++++++++++++++++++++++++
>>   drivers/ufs/core/ufshcd.c  | 394 ++++++++++++++++++++++++++--------
>>   include/ufs/ufs.h          |   5 +
>>   include/ufs/ufshcd.h       | 223 ++++++++++++++++++-
>>   include/ufs/ufshci.h       |  77 +++++++
>>   6 files changed, 1135 insertions(+), 90 deletions(-)
> 
> This patch is too big to review. Could you please split it into multiple
> patches?
> 
The current changes make up a single functional base MCQ driver.
Usually splitting into multiple changes are per feature based.
Since this is a single feature, it makes sense to be separated out into 
core and host only. Refer 7a3e97b0d - the base ufs driver.

> 
> 
> s/qd/depth
> 
Here queue depth is abbreviated to qd which I think is inline with what 
the function does. So I prefer to keep it as qd.

>> +
>> +	val = ufshcd_readl(hba, REG_UFS_MCQ_CFG);
> 
> 
>> +struct ufs_hw_queue {
>> +	void *sqe_base_addr;
> 
> s/sqe_base_addr/sqe_base
>  >> +	dma_addr_t sqe_dma_addr;
> 
> s/sqe_dma_addr/sqe_dma
> 
>> +	struct cq_entry *cqe_base_addr;
> 
> s/cqe_base_addr/cqe_base
> 
>> +	dma_addr_t cqe_dma_addr;
> 
> s/cqe_dma_addr/cqe_dma
> 
Existing ufs driver dma addresses have the suffix addr, Refer struct 
ufshcd_lrb. So it is in line with the current naming convention.

>> +	u32 max_entries;
>> +	u32 id;
>> +
>> +	void __iomem *mcq_sq_hp;
>> +	void __iomem *mcq_sq_tp;
>> +	void __iomem *mcq_cq_hp;
>> +	void __iomem *mcq_cq_tp;
[...]

>> +			      MCQ_CFG_n(REG_SQATTR, i));
> If you are writing to the same memory region, like in this case "mcq_base",
> then you should be able to use _relaxed variants as the writes to the same
> device memory are guaranteed to be in-order.
> 
Not sure if I understand this correctly. Let me check this internally 
and get back.

> This also removes the overhead associated with __iowmb included in writel.
> 
> Please audit this change throught the driver and use _relaxed variants where
> applicable.
> 

-asd

>> -- 
>> Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.
>>
> 

Re: [RFC PATCH v2 1/2] scsi: ufs: Add Multi-Circular Queue support

[Bart Van Assche]

On 8/11/22 03:33, Can Guo wrote:
> +#define mcq_sqattr_offset(c) \
> +	((((c) >> 16) & MCQ_QCFGPTR_MASK) * MCQ_QCFGPTR_UNIT)

Can the above macro be converted into an inline function? If not, 
consider using uppercase characters for the macro name.

> +#define MCQ_ENTRY_SIZE_IN_DWORD	8
> +#define MCQ_QCFG_SIZE	0x40
> +
> +static unsigned int dev_cmd_queue = 1;
> +static unsigned int read_queues;
> +static unsigned int poll_queues = 1;
> +
> +static int rw_queue_count_set(const char *val, const struct kernel_param *kp)
> +{
> +	unsigned int n;
> +	int ret;
> +
> +	ret = kstrtouint(val, 10, &n);
> +	if (ret)
> +		return ret;
> +	if (n > num_possible_cpus())
> +		return -EINVAL;
> +	return param_set_uint(val, kp);
> +}
> +
> +static const struct kernel_param_ops rw_queue_count_ops = {
> +	.set = rw_queue_count_set,
> +	.get = param_get_uint,
> +};
> +
> +static unsigned int rw_queues = 8;
> +module_param_cb(rw_queues, &rw_queue_count_ops, &rw_queues, 0644);
> +MODULE_PARM_DESC(rw_queues, "Number of queues used for rw. Default value is 8");

The description of this kernel module parameter sounds confusing to me 
since read and write requests may also end up on a poll queue. How about 
the following description?

"Number of I/O queues that use interrupts for reporting completions 
(HCTX_TYPE_DEFAULT)"

> +u32 ufshcd_mcq_find_queue_depth(struct ufs_hba *hba)
> +{
> +	u32 qd, val, mac;
> +
> +	val = ufshcd_readl(hba, REG_UFS_MCQ_CFG);
> +	mac = ufshcd_mcq_vops_get_hba_mac(hba);
> +	if (mac < 0)
> +		mac = (val & MCQ_CFG_MAC_MASK) >> MCQ_CFG_MAC_OFFSET;

How can mac be negative since it has been declared as u32?

> +	/*  MAC is a 0 based value. */
> +	mac += 1;
> +	qd = min_t(u32, mac, hba->dev_info.bqueuedepth);
> +	if (!qd)
> +		qd = mac;
> +
> +	/* Adjust queue depth based on ext_iid support. */
> +	if (qd > 256 && (!hba->ext_iid_sup || !hba->dev_info.b_ext_iid_en))
> +		qd = 256;
> +	if (qd > 4096 && hba->ext_iid_sup && hba->dev_info.b_ext_iid_en)
> +		qd = 4096;
> +
> +	return qd;
> +}
> +EXPORT_SYMBOL_GPL(ufshcd_mcq_find_queue_depth);

Since the above function implements a policy, there should be a comment 
above this function that explains which policy has been implemented.

Additionally, consider changing "find" into e.g. "decide" since I think 
the latter verb better reflects what the above function does.

> +void ufshcd_mcq_config_mac(struct ufs_hba *hba, u32 set)
> +{
> +	u32 val;
> +
> +	val = ufshcd_readl(hba, REG_UFS_MCQ_CFG);
> +	val &= ~MCQ_CFG_MAC_MASK;
> +	val |= set << MCQ_CFG_MAC_OFFSET;
> +	ufshcd_writel(hba, val, REG_UFS_MCQ_CFG);
> +}
> +EXPORT_SYMBOL_GPL(ufshcd_mcq_config_mac);

Please add a comment that explains what "MAC" stands for or what this 
function does. Additionally, please choose a better name for the 
function argument "set" (max_active_cmds?).

> +struct ufs_hw_queue *ufshcd_mcq_find_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);
> +
> +	return &hba->uhq[hwq + UFSHCD_MCQ_IO_QUEUE_OFFSET];
> +}
> +EXPORT_SYMBOL_GPL(ufshcd_mcq_find_hwq);

Consider renaming this function into ufshcd_req_to_hwq(). I think that 
name better reflects the purpose of this function.

> +int ufshcd_mcq_memory_alloc(struct ufs_hba *hba)
> +{
> +	struct ufs_hw_queue *hwq;
> +	size_t utrdl_size, cqe_size;
> +	int i;
> +
> +	for_each_hw_queue(hba, 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 || WARN_ON(hwq->sqe_dma_addr &
> +						  (PAGE_SIZE - 1))) {
> +			dev_err(hba->dev, "Alloc SQE 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 || WARN_ON(hwq->cqe_dma_addr &
> +						  (PAGE_SIZE - 1))) {
> +			dev_err(hba->dev, "Alloc CQE failed\n");
> +			return -ENOMEM;
> +		}
> +	}
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(ufshcd_mcq_memory_alloc);

Please leave out the dma_addr alignment checks since page alignment is 
guaranteed. From dma-api-howto.rst: "The CPU virtual address and the DMA 
address are both guaranteed to be aligned to the smallest PAGE_SIZE 
order which is greater than or equal to the requested size."

> +#define MCQ_ROP_OFFSET_n(p, i) \
> +	(hba->mcq_rop[(p)].offset + hba->mcq_rop[(p)].stride * (i))
> +
> +static inline void __iomem *mcq_rop_base(struct ufs_hba *hba,
> +					 enum ufshcd_mcq_rop n, int i)
> +{
> +	struct ufshcd_mcq_rop_info_t *rop = &hba->mcq_rop[n];
> +
> +	return rop->base + rop->stride * i;
> +}

Please add a comment that explains what "rop" stands for.

> +void ufshcd_mcq_make_queues_operational(struct ufs_hba *hba)
> +{
> +	struct ufs_hw_queue *hwq;
> +	u16 qsize;
> +	int i;
> +
> +	for_each_hw_queue(hba, i) {
> +		hwq = &hba->uhq[i];
> +		hwq->id = i;
> +		qsize = hwq->max_entries * MCQ_ENTRY_SIZE_IN_DWORD - 1;
> +
> +		/* SQLBA */
> +		ufsmcq_writel(hba, lower_32_bits(hwq->sqe_dma_addr),
> +			      MCQ_CFG_n(REG_SQLBA, i));
> +		/* SQUBA */
> +		ufsmcq_writel(hba, upper_32_bits(hwq->sqe_dma_addr),
> +			      MCQ_CFG_n(REG_SQUBA, i));
> +		/* SQDAO */
> +		ufsmcq_writel(hba, MCQ_ROP_OFFSET_n(ROP_SQD, i),
> +			      MCQ_CFG_n(REG_SQDAO, i));
> +		/* SQISAO */
> +		ufsmcq_writel(hba, MCQ_ROP_OFFSET_n(ROP_SQIS, i),
> +			      MCQ_CFG_n(REG_SQISAO, i));
> +
> +		/* CQLBA */
> +		ufsmcq_writel(hba, lower_32_bits(hwq->cqe_dma_addr),
> +			      MCQ_CFG_n(REG_CQLBA, i));
> +		/* CQUBA */
> +		ufsmcq_writel(hba, upper_32_bits(hwq->cqe_dma_addr),
> +			      MCQ_CFG_n(REG_CQUBA, i));
> +		/* CQDAO */
> +		ufsmcq_writel(hba, MCQ_ROP_OFFSET_n(ROP_CQD, i),
> +			      MCQ_CFG_n(REG_CQDAO, i));
> +		/* CQISAO */
> +		ufsmcq_writel(hba, MCQ_ROP_OFFSET_n(ROP_CQIS, i),
> +			      MCQ_CFG_n(REG_CQISAO, i));

Mentioning the names of the registers from the spec is great. To make 
the above code easier to read, please add the full names of the 
registers next to the register name acronyms.

> +static void ufshcd_mcq_config_nr_queues(struct ufs_hba *hba)
> +{
> +	int i;
> +	u32 hbaq_cap, def_nr_queues, max_nr_queues;
> +	struct Scsi_Host *host = hba->host;
> +
> +	/* default queues will be less than or equal to max_nr_queues */
> +	def_nr_queues = rw_queues + poll_queues + read_queues + dev_cmd_queue;
> +	max_nr_queues = num_possible_cpus() + poll_queues + read_queues +
> +		dev_cmd_queue;
> +	hbaq_cap = hba->mcq_capabilities & 0xff;
> +
> +	if (hbaq_cap >= max_nr_queues)
> +		hba->nr_queues[HCTX_TYPE_DEFAULT] = num_possible_cpus();
> +	else if (hbaq_cap >= def_nr_queues)
> +		hba->nr_queues[HCTX_TYPE_DEFAULT] = rw_queues;
> +	else
> +		hba->nr_queues[HCTX_TYPE_DEFAULT] = hbaq_cap - read_queues -
> +						    poll_queues - dev_cmd_queue;

If hbaq_cap <= 3, read_queues == 1, poll_queues == 1 and dev_cmd_queue 
== 1, will that result in zero or less than zero queues of type 
HCTX_TYPE_DEFAULT?

> +	/* One more reserved for dev_cmd_queue */
> +	hba->nr_hw_queues = host->nr_hw_queues + 1;

Should '1' above perhaps be changed into 'dev_cmd_queue'? Are you sure 
that the comment above is in sync with the code?

> +	ret = ufshcd_mcq_vops_config_rop(hba);
> +	if (ret) {
> +		dev_err(hba->dev, "MCQ Runtime Operation Pointers not configured\n");
> +		goto out_err;
> +	}

I can't find the phrase "runtime operation" in the spec? Since that 
structure only holds submission and completion queues, consider using 
the word "queues" instead of the acronym "rop". The phrase "runtime 
operation" is so generic that it is meaningless.

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

dev_cmd -> device commands? Please write words in full instead of using 
acronyms in comments.

> +	/* Give dev_cmd_queue the minimal num of entries */

num -> number.

> +	/* Selct MCQ mode */

Selct -> Select.

> +u32 ufshcd_mcq_read_cqis(struct ufs_hba *hba, int i)
> +{
> +	return readl(mcq_rop_base(hba, ROP_CQIS, i) + REG_CQIS);
> +}
> +EXPORT_SYMBOL_GPL(ufshcd_mcq_read_cqis);

Please remove all EXPORT_SYMBOL() / EXPORT_SYMBOL_GPL() declarations 
from this source file except for those functions for which patch 2/2 
adds a caller.

Please add a comment above this function that explains what "cqis" 
stands for.

> +	for_each_hw_queue(hba, i) {
> +		/* enable CQIS.TEPS interrupt only for non-poll queues */
> +		if (i >= hba->nr_hw_queues - hba->nr_queues[HCTX_TYPE_POLL])
> +			continue;

continue -> break?

> +void ufshcd_mcq_enable_esi(struct ufs_hba *hba)
> +{
> +	ufshcd_writel(hba, ufshcd_readl(hba, REG_UFS_MEM_CFG) | 0x2,
> +		      REG_UFS_MEM_CFG);
> +}

Please add a comment above this function that explains the meaning of "esi".

> +static inline int ufshcd_mcq_get_tag(struct ufs_hba *hba,
> +				     struct ufs_hw_queue *hwq,
> +				     struct cq_entry *cqe)
> +{
> +	dma_addr_t dma_addr;
> +
> +	dma_addr = ((u64)le32_to_cpu(cqe->command_desc_base_addr_hi) << 32) |
> +		   (le32_to_cpu(cqe->command_desc_base_addr_lo) & 0xffffff80);

Why to mask off the lowest bits of the address? I think that deserves a 
comment.

> +	return (dma_addr - hba->ucdl_dma_addr) /
> +		sizeof_utp_transfer_cmd_desc(hba);
> +}

I can't find sizeof_utp_transfer_cmd_desc() in Linus' master branch?

> +static inline void ufshcd_mcq_process_event(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_task(hba, tag, cqe);
> +}

Consider changing "process_event" into "process_cqe". Consider renaming 
ufshcd_compl_one_task() into ufshcd_compl_one_cqe().

> +unsigned long ufshcd_mcq_poll_cqe_lock(struct ufs_hba *hba,
> +				       struct ufs_hw_queue *hwq)
> +{
> +	unsigned long completed_reqs, flags;
> +
> +	spin_lock_irqsave(&hwq->cq_lock, flags);
> +	completed_reqs = ufshcd_mcq_poll_cqe_nolock(hba, hwq);
> +	spin_unlock_irqrestore(&hwq->cq_lock, flags);
> +
> +	return completed_reqs;
> +}

Why are interrupts disabled around ufshcd_mcq_poll_cqe_nolock() calls?

Why are the ufshcd_mcq_poll_cqe_nolock() protected by a spinlock?

> -static int ufshcd_probe_hba(struct ufs_hba *hba, bool init_dev_params);
> +static int ufshcd_probe_hba(struct ufs_hba *hba, bool initial_boot);

Since the above change is not related to MCQ, please move it into a 
separate patch.

> -static void ufshcd_add_cmd_upiu_trace(struct ufs_hba *hba, unsigned int tag,
> +static void ufshcd_add_cmd_upiu_trace(struct ufs_hba *hba,
> +				      struct ufshcd_lrb *lrbp,
>   				      enum ufs_trace_str_t str_t)

Above I see another change that should be moved into a separate patch.

>   static inline
> -void ufshcd_send_command(struct ufs_hba *hba, unsigned int task_tag)
> +void ufshcd_send_command(struct ufs_hba *hba, struct ufshcd_lrb *lrbp,
> +			 struct ufs_hw_queue *hwq)
>   {

The above change should also be moved into a separate patch (before the 
MCQ patch).

> +	if (is_mcq_enabled(hba)) {
> +		int utrd_size = sizeof(struct utp_transfer_req_desc);
> +
> +		spin_lock(&hwq->sq_lock);
> +		if (hba->vops && hba->vops->setup_xfer_req)
> +			hba->vops->setup_xfer_req(hba, lrbp->task_tag,
> +						  !!lrbp->cmd);
> +		memcpy(hwq->sqe_base_addr + (hwq->sq_tp_slot * utrd_size),
> +		       lrbp->utr_descriptor_ptr, utrd_size);
> +		ufshcd_inc_tp(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);
> +	}

Please leave out the setup_xfer_req() call for the MCQ path since the 
existing setup_xfer_req() calls are not compatible with MCQ.

> @@ -2553,9 +2585,10 @@ void ufshcd_prepare_utp_scsi_cmd_upiu(struct ufshcd_lrb *lrbp, u8 upiu_flags)
>   	/* command descriptor fields */
>   	ucd_req_ptr->header.dword_0 = UPIU_HEADER_DWORD(
>   				UPIU_TRANSACTION_COMMAND, upiu_flags,
> -				lrbp->lun, lrbp->task_tag);
> +				lrbp->lun, lrbp->task_tag & 0xff);
>   	ucd_req_ptr->header.dword_1 = UPIU_HEADER_DWORD(
> -				UPIU_COMMAND_SET_TYPE_SCSI, 0, 0, 0);
> +				UPIU_COMMAND_SET_TYPE_SCSI, 0, 0,
> +				(lrbp->task_tag & 0xF00) << 4);

Please move this change into a new preparatory patch.

>   		ret = blk_mq_map_queues(map);
> -		WARN_ON_ONCE(ret);
> +
> +		if (ret)
> +			return ret;

Please ignore the blk_mq_map_queues() return value entirely to prevent 
that this patch would cause a merge conflict with the following patch: 
"[PATCH v2 2/2] block: Change the return type of blk_mq_map_queues() 
into void" 
(https://lore.kernel.org/linux-block/CAJpMwyjfn14zN=KUUnJBPswrbWX5zbd6OUrMokuPW1qDTsB4RA@mail.gmail.com/T/#u).

> -		dev_dbg(hba->dev, "%s: dev_cmd request timedout, tag %d\n",
> +		dev_err(hba->dev, "%s: dev_cmd request timedout, tag %d\n",
>   			__func__, lrbp->task_tag);

The above change is not related to adding MCQ support so it should be a 
separate patch.

> -	const u32 tag = hba->reserved_slot;
> +	u32 tag = hba->reserved_slot;

What is the motivation of this change?

> +static void ufshcd_release_sdb_queue(struct ufs_hba *hba, int nutrs)
> +{

Please add a comment that explains what "sdb" stands for.

> +	ucdl_size = (sizeof(struct utp_transfer_cmd_desc) * nutrs);

No superfluous parentheses please.

> -static void ufshcd_host_memory_configure(struct ufs_hba *hba)
> +static int ufshcd_host_memory_configure(struct ufs_hba *hba)
>   {
>   	struct utp_transfer_req_desc *utrdlp;
>   	dma_addr_t cmd_desc_dma_addr;
> @@ -3756,6 +3811,8 @@ static void ufshcd_host_memory_configure(struct ufs_hba *hba)
>   
>   		ufshcd_init_lrb(hba, &hba->lrb[i], i);
>   	}
> +
> +	return 0;
>   }

What is the purpose of this change? The above change does not seem 
useful to me.

> -	/* Configure UTRL and UTMRL base address registers */
> +	/* Configure UTRL base address registers */
>   	ufshcd_writel(hba, lower_32_bits(hba->utrdl_dma_addr),
>   			REG_UTP_TRANSFER_REQ_LIST_BASE_L);
>   	ufshcd_writel(hba, upper_32_bits(hba->utrdl_dma_addr),
>   			REG_UTP_TRANSFER_REQ_LIST_BASE_H);
> +
> +	/* Configure UTMRL base address registers */
>   	ufshcd_writel(hba, lower_32_bits(hba->utmrdl_dma_addr),
>   			REG_UTP_TASK_REQ_LIST_BASE_L);

Since the above change is independent of adding MCQ support, consider 
moving it into a separate patch.

> +void ufshcd_compl_one_task(struct ufs_hba *hba, int task_tag,
> +			  struct cq_entry *cqe)
> +{
> +	struct ufshcd_lrb *lrbp;
> +	struct scsi_cmnd *cmd;
> +
> +	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, lrbp, 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, lrbp, UFS_DEV_COMP);
> +			complete(hba->dev_cmd.complete);
> +			ufshcd_clk_scaling_update_busy(hba);
> +		}
> +	}
> +}

Please add a new patch to this patch series that introduces the 
ufshcd_compl_one_task() and in this patch introduce MCQ support in that 
function.

> +/**
> + * ufshcd_handle_mcq_cq_events - handle MCQ completion queue events
> + * @hba: per adapter instance
> + *
> + * Returns
> + *  IRQ_HANDLED - If interrupt is valid
> + *  IRQ_NONE    - If invalid interrupt
> + */

How could an interrupt be invalid? Please improve these descriptions or 
leave them out. Mentioning that this function either returns IRQ_HANDLED 
or IRQ_NONE should be sufficient.

> +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_TEPS)
> +			ufshcd_mcq_poll_cqe_nolock(hba, hwq);
> +	}
> +
> +	return IRQ_HANDLED;
> +}

Why the loop over the completion queues? Shouldn't UFSHCI 4.0 compliant 
controllers support one interrupt per completion queue?

> -/* Complete requests that have door-bell cleared */
> +/*
> + * Complete requests that have door-bell cleared and/or pending completion
> + * entries on completion queues if MCQ is enabled
> + */

Since the above comment has been changed, please spell the word doorbell 
correctly (no hyphen).

> @@ -6823,7 +6947,7 @@ static int ufshcd_issue_devman_upiu_cmd(struct ufs_hba *hba,
>   					enum query_opcode desc_op)
>   {
>   	DECLARE_COMPLETION_ONSTACK(wait);
> -	const u32 tag = hba->reserved_slot;
> +	u32 tag = hba->reserved_slot;

Why has the 'const' keyword been removed?

> +	if (hba->nutrs != old_nutrs) {
> +		ufshcd_release_sdb_queue(hba, old_nutrs);
> +		ret = ufshcd_memory_alloc(hba);
> +		if (ret)
> +			return ret;
> +		ufshcd_host_memory_configure(hba);
> +	}

Can this freeing + reallocating be avoided?

> -static int ufshcd_probe_hba(struct ufs_hba *hba, bool init_dev_params)
> +static int ufshcd_probe_hba(struct ufs_hba *hba, bool initial_boot)

Please move this change into a separate patch.

> +	if (!is_mcq_supported(hba)) {
> +		/* Refer ufshcd_map_queues() */
> +		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;
> +	}

Can the above code be moved into ufshcd_map_queues()?

> @@ -589,6 +591,7 @@ struct ufs_dev_info {
>   	u8	*model;
>   	u16	wspecversion;
>   	u32	clk_gating_wait_us;
> +	u8	bqueuedepth;

Please document the meaning of bqueuedepth.

> +	bool	b_ext_iid_en;

Same comment here.

>   /* clock gating state  */
> @@ -713,6 +723,39 @@ struct ufs_hba_monitor {
>   	bool enabled;
>   };
>   
> +struct ufshcd_res_info_t {
> +	char *name;
> +	struct resource *resource;
> +	bool is_alloc;
> +	void __iomem *base;
> +};

Please document the meaning of this data structure and consider making 
the 'name' pointer const char * instead of char *.

> +#define for_each_hw_queue(hba, i) \
> +	for ((i) = 0; (i) < (hba)->nr_hw_queues; (i)++)

Please remove this macro and open-code this for-loop. I think that will 
improve source code readability.

> +static inline void ufshcd_inc_tp(struct ufs_hw_queue *q)
> +{
> +	u32 next_slot = ((q->sq_tp_slot + 1) % q->max_entries);
> +	u32 val = next_slot * sizeof(struct utp_transfer_req_desc);
> +
> +	q->sq_tp_slot = next_slot;
> +
> +	writel(val, q->mcq_sq_tp);
> +}

Can q->max_entries be made a power of two such that the % above can be 
changed into & (logical and)?

> -#define ufshcd_writel(hba, val, reg)	\
> +#define ufshcd_writel(hba, val, reg)		\

As requested before, please do not make any unnecessary whitespace changes.

> +struct cq_entry {
> +	/* DW 0-1 */
> +	__le32 command_desc_base_addr_lo;
> +	__le32 command_desc_base_addr_hi;

Please use a single __le64 member instead of two __le32 members.

> +	/* 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];
> +};

Consider adding a static_assert() that verifies the structure size at 
compile time.

Thanks,

Bart.

Re: [RFC PATCH v2 1/2] scsi: ufs: Add Multi-Circular Queue support

[Asutosh Das (asd)]

Hello Bart,

Thanks for taking a look.

Sorry for the delay in response.

Please find the response to your comments below.

On 8/18/2022 7:41 PM, Bart Van Assche wrote:
> On 8/11/22 03:33, Can Guo wrote:
[...]
>> +    /* One more reserved for dev_cmd_queue */
>> +    hba->nr_hw_queues = host->nr_hw_queues + 1;
> 
> Should '1' above perhaps be changed into 'dev_cmd_queue'? Are you sure 
> that the comment above is in sync with the code?
> 
>> +    ret = ufshcd_mcq_vops_config_rop(hba);
>> +    if (ret) {
>> +        dev_err(hba->dev, "MCQ Runtime Operation Pointers not 
>> configured\n");
>> +        goto out_err;
>> +    }
[...]
>> +static inline void ufshcd_mcq_process_event(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_task(hba, tag, cqe);
>> +}
> 
> Consider changing "process_event" into "process_cqe". Consider renaming 
> ufshcd_compl_one_task() into ufshcd_compl_one_cqe().
> 
The preparatory patch that would precede this change would define 
ufshcd_compl_one_task() in ufshcd.c. Since this function would be 
invoked both from Single Doorbell mode and MCQ mode, 
ufshcd_compl_one_task() sounds more relevant. What say?

>> +unsigned long ufshcd_mcq_poll_cqe_lock(struct ufs_hba *hba,
>> +                       struct ufs_hw_queue *hwq)
>> +{
>> +    unsigned long completed_reqs, flags;
>> +
>> +    spin_lock_irqsave(&hwq->cq_lock, flags);
>> +    completed_reqs = ufshcd_mcq_poll_cqe_nolock(hba, hwq);
>> +    spin_unlock_irqrestore(&hwq->cq_lock, flags);
>> +
>> +    return completed_reqs;
>> +}
> 
> Why are interrupts disabled around ufshcd_mcq_poll_cqe_nolock() calls?
> 
> Why are the ufshcd_mcq_poll_cqe_nolock() protected by a spinlock?
> 
Because ufshcd_mcq_poll_cqe_lock() is invoked by ufshcd_poll() which may 
be invoked simultaneously from different CPUs.
But only spin_[un]lock() variant can suffice here.

[...]

>> +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_TEPS)
>> +            ufshcd_mcq_poll_cqe_nolock(hba, hwq);
>> +    }
>> +
>> +    return IRQ_HANDLED;
>> +}
> 
> Why the loop over the completion queues? Shouldn't UFSHCI 4.0 compliant 
> controllers support one interrupt per completion queue?
> 
MCQ specification doesn't define that UFSHCI 4.0 compliant HC should 
support one interrupt per completion queue. I guess it would depend on 
HC vendors. But it specifies ESI as an alternate method; which is 
implemented in this patch.

>> -/* Complete requests that have door-bell cleared */
>> +/*
>> + * Complete requests that have door-bell cleared and/or pending 
>> completion
>> + * entries on completion queues if MCQ is enabled
>> + */
> 
> Since the above comment has been changed, please spell the word doorbell 
> correctly (no hyphen).
> 
>> @@ -6823,7 +6947,7 @@ static int ufshcd_issue_devman_upiu_cmd(struct 
>> ufs_hba *hba,
>>                       enum query_opcode desc_op)
>>   {
>>       DECLARE_COMPLETION_ONSTACK(wait);
>> -    const u32 tag = hba->reserved_slot;
>> +    u32 tag = hba->reserved_slot;
> 
> Why has the 'const' keyword been removed?
> 
>> +    if (hba->nutrs != old_nutrs) {
>> +        ufshcd_release_sdb_queue(hba, old_nutrs);
>> +        ret = ufshcd_memory_alloc(hba);
>> +        if (ret)
>> +            return ret;
>> +        ufshcd_host_memory_configure(hba);
>> +    }
> 
> Can this freeing + reallocating be avoided?
> 
Umm, we thought about this. Only after reading the device params, the 
ext_iid support and the device queue depth be determined. So didn't look 
like there's any other way than this. If you have any ideas, please let 
us know.

Agree with the rest of the suggestions, would address it in the next 
version.

-asd/can

Re: [RFC PATCH v2 1/2] scsi: ufs: Add Multi-Circular Queue support

[Bart Van Assche]

On 8/24/22 18:42, Asutosh Das (asd) wrote:
> On 8/18/2022 7:41 PM, Bart Van Assche wrote:
>> On 8/11/22 03:33, Can Guo wrote:
>>> +static inline void ufshcd_mcq_process_event(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_task(hba, tag, cqe);
>>> +}
>>
>> Consider changing "process_event" into "process_cqe". Consider 
>> renaming ufshcd_compl_one_task() into ufshcd_compl_one_cqe().
>>
> The preparatory patch that would precede this change would define 
> ufshcd_compl_one_task() in ufshcd.c. Since this function would be 
> invoked both from Single Doorbell mode and MCQ mode, 
> ufshcd_compl_one_task() sounds more relevant. What say?

The name "task" is confusing since in SCSI standard documents it refers 
to "task management" while ufshcd_compl_one_task() is not related to 
SCSI task management at all. So I would appreciate it if another name is 
chosen than ufshcd_compl_one_task().

>>> +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_TEPS)
>>> +            ufshcd_mcq_poll_cqe_nolock(hba, hwq);
>>> +    }
>>> +
>>> +    return IRQ_HANDLED;
>>> +}
>>
>> Why the loop over the completion queues? Shouldn't UFSHCI 4.0 
>> compliant controllers support one interrupt per completion queue?
>>
> MCQ specification doesn't define that UFSHCI 4.0 compliant HC should 
> support one interrupt per completion queue. I guess it would depend on 
> HC vendors. But it specifies ESI as an alternate method; which is 
> implemented in this patch.

It is unfortunate that support for the ESI mechanism is optional in the 
UFSHCI 4.0 specification since I consider this as one of the most 
important UFSHCI 4.0 features. I wouldn't mind if MCQ would only be 
supported for UFSHCI 4.0 controllers that support ESI.

>>> +    if (hba->nutrs != old_nutrs) {
>>> +        ufshcd_release_sdb_queue(hba, old_nutrs);
>>> +        ret = ufshcd_memory_alloc(hba);
>>> +        if (ret)
>>> +            return ret;
>>> +        ufshcd_host_memory_configure(hba);
>>> +    }
>>
>> Can this freeing + reallocating be avoided?
>>
> Umm, we thought about this. Only after reading the device params, the 
> ext_iid support and the device queue depth be determined. So didn't look 
> like there's any other way than this. If you have any ideas, please let 
> us know.

Re: [RFC PATCH v2 1/2] scsi: ufs: Add Multi-Circular Queue support

[Asutosh Das (asd)]

On 8/25/2022 11:04 AM, Bart Van Assche wrote:
> On 8/24/22 18:42, Asutosh Das (asd) wrote:
>> On 8/18/2022 7:41 PM, Bart Van Assche wrote:
>>> On 8/11/22 03:33, Can Guo wrote:
>>>> +static inline void ufshcd_mcq_process_event(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_task(hba, tag, cqe);
>>>> +}
>>>
>>> Consider changing "process_event" into "process_cqe". Consider 
>>> renaming ufshcd_compl_one_task() into ufshcd_compl_one_cqe().
>>>
>> The preparatory patch that would precede this change would define 
>> ufshcd_compl_one_task() in ufshcd.c. Since this function would be 
>> invoked both from Single Doorbell mode and MCQ mode, 
>> ufshcd_compl_one_task() sounds more relevant. What say?
> 
> The name "task" is confusing since in SCSI standard documents it refers 
> to "task management" while ufshcd_compl_one_task() is not related to 
> SCSI task management at all. So I would appreciate it if another name is 
> chosen than ufshcd_compl_one_task().
> 
Ok, makes sense. Will change the name in the next version.

Thanks,
-asd

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

[Can Guo]

Use ESI and define Runtime and Operation definitions for MCQ.

Co-developed-by: Asutosh Das <quic_asutoshd@quicinc.com>
Signed-off-by: Can Guo <quic_cang@quicinc.com>
Signed-off-by: Asutosh Das <quic_asutoshd@quicinc.com>
---
 drivers/ufs/host/ufs-qcom.c | 125 ++++++++++++++++++++++++++++++++++++++++++++
 drivers/ufs/host/ufs-qcom.h |   4 ++
 2 files changed, 129 insertions(+)

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
-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.

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

[Bart Van Assche]

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.