[PATCH v12 08/15] ufs: core: mcq: Configure operation and runtime interface

From: Asutosh Das
Date: Tue Jan 03 2023 - 14:14:48 EST

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

Co-developed-by: Can Guo <quic_cang@xxxxxxxxxxx>
Signed-off-by: Can Guo <quic_cang@xxxxxxxxxxx>
Signed-off-by: Asutosh Das <quic_asutoshd@xxxxxxxxxxx>
Reviewed-by: Manivannan Sadhasivam <mani@xxxxxxxxxx>
Reviewed-by: Bart Van Assche <bvanassche@xxxxxxx>
---
drivers/ufs/core/ufs-mcq.c | 102 +++++++++++++++++++++++++++++++++++++++++
drivers/ufs/core/ufshcd-priv.h | 11 +++++
drivers/ufs/core/ufshcd.c | 27 +++++++++++
drivers/ufs/host/ufs-qcom.c | 24 ++++++++++
include/ufs/ufshcd.h | 52 +++++++++++++++++++++
include/ufs/ufshci.h | 31 +++++++++++++
6 files changed, 247 insertions(+)

diff --git a/drivers/ufs/core/ufs-mcq.c b/drivers/ufs/core/ufs-mcq.c
index c77bc54..496e2b6 100644
--- a/drivers/ufs/core/ufs-mcq.c
+++ b/drivers/ufs/core/ufs-mcq.c
@@ -18,9 +18,13 @@
#define UFS_MCQ_MIN_READ_QUEUES 0
#define UFS_MCQ_NUM_DEV_CMD_QUEUES 1
#define UFS_MCQ_MIN_POLL_QUEUES 0
+#define QUEUE_EN_OFFSET 31
+#define QUEUE_ID_OFFSET 16

#define MAX_DEV_CMD_ENTRIES 2
#define MCQ_CFG_MAC_MASK GENMASK(16, 8)
+#define MCQ_QCFG_SIZE 0x40
+#define MCQ_ENTRY_SIZE_IN_DWORD 8

static int rw_queue_count_set(const char *val, const struct kernel_param *kp)
{
@@ -71,6 +75,24 @@ MODULE_PARM_DESC(poll_queues,
"Number of poll queues used for r/w. Default value is 1");

/**
+ * ufshcd_mcq_config_mac - Set the #Max Activ Cmds.
+ * @hba - per adapter instance
+ * @max_active_cmds - maximum # of active commands to the device at any time.
+ *
+ * The controller won't send more than the max_active_cmds to the device at
+ * any time.
+ */
+void ufshcd_mcq_config_mac(struct ufs_hba *hba, u32 max_active_cmds)
+{
+ u32 val;
+
+ val = ufshcd_readl(hba, REG_UFS_MCQ_CFG);
+ val &= ~MCQ_CFG_MAC_MASK;
+ val |= FIELD_PREP(MCQ_CFG_MAC_MASK, max_active_cmds);
+ ufshcd_writel(hba, val, REG_UFS_MCQ_CFG);
+}
+
+/**
* ufshcd_mcq_decide_queue_depth - decide the queue depth
* @hba - per adapter instance
*
@@ -182,6 +204,80 @@ int ufshcd_mcq_memory_alloc(struct ufs_hba *hba)
}


+/* Operation and runtime registers configuration */
+#define MCQ_CFG_n(r, i) ((r) + MCQ_QCFG_SIZE * (i))
+#define MCQ_OPR_OFFSET_n(p, i) \
+ (hba->mcq_opr[(p)].offset + hba->mcq_opr[(p)].stride * (i))
+
+static void __iomem *mcq_opr_base(struct ufs_hba *hba,
+ enum ufshcd_mcq_opr n, int i)
+{
+ struct ufshcd_mcq_opr_info_t *opr = &hba->mcq_opr[n];
+
+ return opr->base + opr->stride * i;
+}
+
+void ufshcd_mcq_make_queues_operational(struct ufs_hba *hba)
+{
+ struct ufs_hw_queue *hwq;
+ u16 qsize;
+ int i;
+
+ for (i = 0; i < hba->nr_hw_queues; i++) {
+ hwq = &hba->uhq[i];
+ hwq->id = i;
+ qsize = hwq->max_entries * MCQ_ENTRY_SIZE_IN_DWORD - 1;
+
+ /* Submission Queue Lower Base Address */
+ ufsmcq_writelx(hba, lower_32_bits(hwq->sqe_dma_addr),
+ MCQ_CFG_n(REG_SQLBA, i));
+ /* Submission Queue Upper Base Address */
+ ufsmcq_writelx(hba, upper_32_bits(hwq->sqe_dma_addr),
+ MCQ_CFG_n(REG_SQUBA, i));
+ /* Submission Queue Doorbell Address Offset */
+ ufsmcq_writelx(hba, MCQ_OPR_OFFSET_n(OPR_SQD, i),
+ MCQ_CFG_n(REG_SQDAO, i));
+ /* Submission Queue Interrupt Status Address Offset */
+ ufsmcq_writelx(hba, MCQ_OPR_OFFSET_n(OPR_SQIS, i),
+ MCQ_CFG_n(REG_SQISAO, i));
+
+ /* Completion Queue Lower Base Address */
+ ufsmcq_writelx(hba, lower_32_bits(hwq->cqe_dma_addr),
+ MCQ_CFG_n(REG_CQLBA, i));
+ /* Completion Queue Upper Base Address */
+ ufsmcq_writelx(hba, upper_32_bits(hwq->cqe_dma_addr),
+ MCQ_CFG_n(REG_CQUBA, i));
+ /* Completion Queue Doorbell Address Offset */
+ ufsmcq_writelx(hba, MCQ_OPR_OFFSET_n(OPR_CQD, i),
+ MCQ_CFG_n(REG_CQDAO, i));
+ /* Completion Queue Interrupt Status Address Offset */
+ ufsmcq_writelx(hba, MCQ_OPR_OFFSET_n(OPR_CQIS, i),
+ MCQ_CFG_n(REG_CQISAO, i));
+
+ /* Save the base addresses for quicker access */
+ hwq->mcq_sq_head = mcq_opr_base(hba, OPR_SQD, i) + REG_SQHP;
+ hwq->mcq_sq_tail = mcq_opr_base(hba, OPR_SQD, i) + REG_SQTP;
+ hwq->mcq_cq_head = mcq_opr_base(hba, OPR_CQD, i) + REG_CQHP;
+ hwq->mcq_cq_tail = mcq_opr_base(hba, OPR_CQD, i) + REG_CQTP;
+
+ /* Enable Tail Entry Push Status interrupt only for non-poll queues */
+ if (i < hba->nr_hw_queues - hba->nr_queues[HCTX_TYPE_POLL])
+ writel(1, mcq_opr_base(hba, OPR_CQIS, i) + REG_CQIE);
+
+ /* Completion Queue Enable|Size to Completion Queue Attribute */
+ ufsmcq_writel(hba, (1 << QUEUE_EN_OFFSET) | qsize,
+ MCQ_CFG_n(REG_CQATTR, i));
+
+ /*
+ * Submission Qeueue Enable|Size|Completion Queue ID to
+ * Submission Queue Attribute
+ */
+ ufsmcq_writel(hba, (1 << QUEUE_EN_OFFSET) | qsize |
+ (i << QUEUE_ID_OFFSET),
+ MCQ_CFG_n(REG_SQATTR, i));
+ }
+}
+
int ufshcd_mcq_init(struct ufs_hba *hba)
{
struct ufs_hw_queue *hwq;
@@ -195,6 +291,12 @@ int ufshcd_mcq_init(struct ufs_hba *hba)
if (ret)
return ret;

+ ret = ufshcd_mcq_vops_op_runtime_config(hba);
+ if (ret) {
+ dev_err(hba->dev, "Operation runtime config failed, ret=%d\n",
+ ret);
+ return ret;
+ }
hba->uhq = devm_kzalloc(hba->dev,
hba->nr_hw_queues * sizeof(struct ufs_hw_queue),
GFP_KERNEL);
diff --git a/drivers/ufs/core/ufshcd-priv.h b/drivers/ufs/core/ufshcd-priv.h
index 6c3c078..00c914c 100644
--- a/drivers/ufs/core/ufshcd-priv.h
+++ b/drivers/ufs/core/ufshcd-priv.h
@@ -64,6 +64,9 @@ void ufshcd_auto_hibern8_update(struct ufs_hba *hba, u32 ahit);
int ufshcd_mcq_init(struct ufs_hba *hba);
int ufshcd_mcq_decide_queue_depth(struct ufs_hba *hba);
int ufshcd_mcq_memory_alloc(struct ufs_hba *hba);
+void ufshcd_mcq_make_queues_operational(struct ufs_hba *hba);
+void ufshcd_mcq_config_mac(struct ufs_hba *hba, u32 max_active_cmds);
+void ufshcd_mcq_select_mcq_mode(struct ufs_hba *hba);

#define SD_ASCII_STD true
#define SD_RAW false
@@ -242,6 +245,14 @@ static inline int ufshcd_mcq_vops_get_hba_mac(struct ufs_hba *hba)
return -EOPNOTSUPP;
}

+static inline int ufshcd_mcq_vops_op_runtime_config(struct ufs_hba *hba)
+{
+ if (hba->vops && hba->vops->op_runtime_config)
+ return hba->vops->op_runtime_config(hba);
+
+ return -EOPNOTSUPP;
+}
+
extern const struct ufs_pm_lvl_states ufs_pm_lvl_states[];

/**
diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index c4f75a4..bd80ce6 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -43,6 +43,12 @@
#define UFSHCD_ENABLE_INTRS (UTP_TRANSFER_REQ_COMPL |\
UTP_TASK_REQ_COMPL |\
UFSHCD_ERROR_MASK)
+
+#define UFSHCD_ENABLE_MCQ_INTRS (UTP_TASK_REQ_COMPL |\
+ UFSHCD_ERROR_MASK |\
+ MCQ_CQ_EVENT_STATUS)
+
+
/* UIC command timeout, unit: ms */
#define UIC_CMD_TIMEOUT 500

@@ -8356,6 +8362,20 @@ static int ufshcd_alloc_mcq(struct ufs_hba *hba)
return ret;
}

+static void ufshcd_config_mcq(struct ufs_hba *hba)
+{
+ ufshcd_enable_intr(hba, UFSHCD_ENABLE_MCQ_INTRS);
+ ufshcd_mcq_make_queues_operational(hba);
+ ufshcd_mcq_config_mac(hba, hba->nutrs);
+
+ hba->host->can_queue = hba->nutrs - UFSHCD_NUM_RESERVED;
+ hba->reserved_slot = hba->nutrs - UFSHCD_NUM_RESERVED;
+ dev_info(hba->dev, "MCQ configured, nr_queues=%d, io_queues=%d, read_queue=%d, poll_queues=%d, queue_depth=%d\n",
+ hba->nr_hw_queues, hba->nr_queues[HCTX_TYPE_DEFAULT],
+ hba->nr_queues[HCTX_TYPE_READ], hba->nr_queues[HCTX_TYPE_POLL],
+ hba->nutrs);
+}
+
/**
* ufshcd_probe_hba - probe hba to detect device and initialize it
* @hba: per-adapter instance
@@ -8385,6 +8405,10 @@ static int ufshcd_probe_hba(struct ufs_hba *hba, bool init_dev_params)
/* UniPro link is active now */
ufshcd_set_link_active(hba);

+ /* Reconfigure MCQ upon reset */
+ if (is_mcq_enabled(hba) && !init_dev_params)
+ ufshcd_config_mcq(hba);
+
/* Verify device initialization by sending NOP OUT UPIU */
ret = ufshcd_verify_dev_init(hba);
if (ret)
@@ -8417,6 +8441,9 @@ static int ufshcd_probe_hba(struct ufs_hba *hba, bool init_dev_params)
dev_err(hba->dev, "scsi_add_host failed\n");
goto out;
}
+ /* MCQ may be disabled if ufshcd_alloc_mcq() fails */
+ if (use_mcq_mode)
+ ufshcd_config_mcq(hba);
}
}

diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
index 10da087..8dddd2d 100644
--- a/drivers/ufs/host/ufs-qcom.c
+++ b/drivers/ufs/host/ufs-qcom.c
@@ -1485,6 +1485,29 @@ static int ufs_qcom_mcq_config_resource(struct ufs_hba *hba)
return ret;
}

+static int ufs_qcom_op_runtime_config(struct ufs_hba *hba)
+{
+ struct ufshcd_res_info *mem_res, *sqdao_res;
+ struct ufshcd_mcq_opr_info_t *opr;
+ int i;
+
+ mem_res = &hba->res[RES_UFS];
+ sqdao_res = &hba->res[RES_MCQ_SQD];
+
+ if (!mem_res->base || !sqdao_res->base)
+ return -EINVAL;
+
+ for (i = 0; i < OPR_MAX; i++) {
+ opr = &hba->mcq_opr[i];
+ opr->offset = sqdao_res->resource->start -
+ mem_res->resource->start + 0x40 * i;
+ opr->stride = 0x100;
+ opr->base = sqdao_res->base + 0x40 * i;
+ }
+
+ return 0;
+}
+
static int ufs_qcom_get_hba_mac(struct ufs_hba *hba)
{
/* Qualcomm HC supports up to 64 */
@@ -1516,6 +1539,7 @@ static const struct ufs_hba_variant_ops ufs_hba_qcom_vops = {
.program_key = ufs_qcom_ice_program_key,
.mcq_config_resource = ufs_qcom_mcq_config_resource,
.get_hba_mac = ufs_qcom_get_hba_mac,
+ .op_runtime_config = ufs_qcom_op_runtime_config,
};

/**
diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h
index 884b5c13..65feb38 100644
--- a/include/ufs/ufshcd.h
+++ b/include/ufs/ufshcd.h
@@ -300,6 +300,7 @@ struct ufs_pwr_mode_info {
* @event_notify: called to notify important events
* @mcq_config_resource: called to configure MCQ platform resources
* @get_hba_mac: called to get vendor specific mac value, mandatory for mcq mode
+ * @op_runtime_config: called to config Operation and runtime regs Pointers
*/
struct ufs_hba_variant_ops {
const char *name;
@@ -340,6 +341,7 @@ struct ufs_hba_variant_ops {
enum ufs_event_type evt, void *data);
int (*mcq_config_resource)(struct ufs_hba *hba);
int (*get_hba_mac)(struct ufs_hba *hba);
+ int (*op_runtime_config)(struct ufs_hba *hba);
};

/* clock gating state */
@@ -753,6 +755,27 @@ enum ufshcd_res {
};

/**
+ * struct ufshcd_mcq_opr_info_t - Operation and Runtime registers
+ *
+ * @offset: Doorbell Address Offset
+ * @stride: Steps proportional to queue [0...31]
+ * @base: base address
+ */
+struct ufshcd_mcq_opr_info_t {
+ unsigned long offset;
+ unsigned long stride;
+ void __iomem *base;
+};
+
+enum ufshcd_mcq_opr {
+ OPR_SQD,
+ OPR_SQIS,
+ OPR_CQD,
+ OPR_CQIS,
+ OPR_MAX,
+};
+
+/**
* struct ufs_hba - per adapter private structure
* @mmio_base: UFSHCI base register address
* @ucdl_base_addr: UFS Command Descriptor base address
@@ -865,6 +888,7 @@ enum ufshcd_res {
* ufshcd_resume_complete()
* @ext_iid_sup: is EXT_IID is supported by UFSHC
* @mcq_sup: is mcq supported by UFSHC
+ * @mcq_enabled: is mcq ready to accept requests
* @res: array of resource info of MCQ registers
* @mcq_base: Multi circular queue registers base address
* @uhq: array of supported hardware queues
@@ -1024,28 +1048,46 @@ struct ufs_hba {
bool complete_put;
bool ext_iid_sup;
bool mcq_sup;
+ bool mcq_enabled;
struct ufshcd_res_info res[RES_MAX];
void __iomem *mcq_base;
struct ufs_hw_queue *uhq;
struct ufs_hw_queue *dev_cmd_queue;
+ struct ufshcd_mcq_opr_info_t mcq_opr[OPR_MAX];
};

/**
* struct ufs_hw_queue - per hardware queue structure
+ * @mcq_sq_head: base address of submission queue head pointer
+ * @mcq_sq_tail: base address of submission queue tail pointer
+ * @mcq_cq_head: base address of completion queue head pointer
+ * @mcq_cq_tail: base address of completion queue tail pointer
* @sqe_base_addr: submission queue entry base address
* @sqe_dma_addr: submission queue dma address
* @cqe_base_addr: completion queue base address
* @cqe_dma_addr: completion queue dma address
* @max_entries: max number of slots in this hardware queue
+ * @id: hardware queue ID
*/
struct ufs_hw_queue {
+ void __iomem *mcq_sq_head;
+ void __iomem *mcq_sq_tail;
+ void __iomem *mcq_cq_head;
+ void __iomem *mcq_cq_tail;
+
void *sqe_base_addr;
dma_addr_t sqe_dma_addr;
struct cq_entry *cqe_base_addr;
dma_addr_t cqe_dma_addr;
u32 max_entries;
+ u32 id;
};

+static inline bool is_mcq_enabled(struct ufs_hba *hba)
+{
+ return hba->mcq_enabled;
+}
+
#ifdef CONFIG_SCSI_UFS_VARIABLE_SG_ENTRY_SIZE
static inline size_t ufshcd_sg_entry_size(const struct ufs_hba *hba)
{
@@ -1127,6 +1169,16 @@ static inline bool ufshcd_enable_wb_if_scaling_up(struct ufs_hba *hba)
return hba->caps & UFSHCD_CAP_WB_WITH_CLK_SCALING;
}

+#define ufsmcq_writel(hba, val, reg) \
+ writel((val), (hba)->mcq_base + (reg))
+#define ufsmcq_readl(hba, reg) \
+ readl((hba)->mcq_base + (reg))
+
+#define ufsmcq_writelx(hba, val, reg) \
+ writel_relaxed((val), (hba)->mcq_base + (reg))
+#define ufsmcq_readlx(hba, reg) \
+ readl_relaxed((hba)->mcq_base + (reg))
+
#define ufshcd_writel(hba, val, reg) \
writel((val), (hba)->mmio_base + (reg))
#define ufshcd_readl(hba, reg) \
diff --git a/include/ufs/ufshci.h b/include/ufs/ufshci.h
index 0d621e9..b6ae571 100644
--- a/include/ufs/ufshci.h
+++ b/include/ufs/ufshci.h
@@ -57,6 +57,7 @@ enum {
REG_UFS_CCAP = 0x100,
REG_UFS_CRYPTOCAP = 0x104,

+ REG_UFS_MEM_CFG = 0x300,
REG_UFS_MCQ_CFG = 0x380,
UFSHCI_CRYPTO_REG_SPACE_SIZE = 0x400,
};
@@ -79,6 +80,35 @@ enum {
MASK_EXT_IID_SUPPORT = 0x00000400,
};

+enum {
+ REG_SQATTR = 0x0,
+ REG_SQLBA = 0x4,
+ REG_SQUBA = 0x8,
+ REG_SQDAO = 0xC,
+ REG_SQISAO = 0x10,
+
+ REG_CQATTR = 0x20,
+ REG_CQLBA = 0x24,
+ REG_CQUBA = 0x28,
+ REG_CQDAO = 0x2C,
+ REG_CQISAO = 0x30,
+};
+
+enum {
+ REG_SQHP = 0x0,
+ REG_SQTP = 0x4,
+};
+
+enum {
+ REG_CQHP = 0x0,
+ REG_CQTP = 0x4,
+};
+
+enum {
+ REG_CQIS = 0x0,
+ REG_CQIE = 0x4,
+};
+
#define UFS_MASK(mask, offset) ((mask) << (offset))

/* UFS Version 08h */
@@ -135,6 +165,7 @@ static inline u32 ufshci_version(u32 major, u32 minor)
#define CONTROLLER_FATAL_ERROR 0x10000
#define SYSTEM_BUS_FATAL_ERROR 0x20000
#define CRYPTO_ENGINE_FATAL_ERROR 0x40000
+#define MCQ_CQ_EVENT_STATUS 0x100000

#define UFSHCD_UIC_HIBERN8_MASK (UIC_HIBERNATE_ENTER |\
UIC_HIBERNATE_EXIT)
--
2.7.4