Re: [PATCH v5 09/16] ufs: core: mcq: Configure operation and runtime interface

From: Manivannan Sadhasivam
Date: Mon Nov 28 2022 - 10:55:47 EST

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In reply to: Bart Van Assche: "Re: [PATCH v5 09/16] ufs: core: mcq: Configure operation and runtime interface"
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On Tue, Nov 22, 2022 at 08:10:22PM -0800, Asutosh Das wrote:
> 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>

Thanks,
Mani

> Reviewed-by: Bart Van Assche <bvanassche@xxxxxxx>
> ---
> drivers/ufs/core/ufs-mcq.c | 101 +++++++++++++++++++++++++++++++++++++++++
> drivers/ufs/core/ufshcd-priv.h | 11 +++++
> drivers/ufs/core/ufshcd.c | 28 ++++++++++++
> 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 51f0e40..ebecc47 100644
> --- a/drivers/ufs/core/ufs-mcq.c
> +++ b/drivers/ufs/core/ufs-mcq.c
> @@ -17,6 +17,8 @@
> #define UFS_MCQ_MIN_READ_QUEUES 0
> #define UFS_MCQ_NUM_DEV_CMD_QUEUES 1
> #define UFS_MCQ_MIN_POLL_QUEUES 0
> +#define QUEUE_EN_OFFSET 31
> +#define QUEUE_ID_OFFSET 16
>
> #define MAX_DEV_CMD_ENTRIES 2
> #define MCQ_CFG_MAC_MASK GENMASK(16, 8)
> @@ -25,6 +27,7 @@
> #define MCQ_SQATTR_OFFSET(c) \
> ((((c) >> 16) & MCQ_QCFGPTR_MASK) * MCQ_QCFGPTR_UNIT)
> #define MCQ_QCFG_SIZE 0x40
> +#define MCQ_ENTRY_SIZE_IN_DWORD 8
>
> static int rw_queue_count_set(const char *val, const struct kernel_param *kp)
> {
> @@ -120,6 +123,24 @@ int ufshcd_mcq_decide_queue_depth(struct ufs_hba *hba)
> return min_t(int, mac, hba->dev_info.bqueuedepth);
> }
>
> +/**
> + * 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);
> +}
> +
> static int ufshcd_mcq_config_resource(struct ufs_hba *hba)
> {
> struct platform_device *pdev = to_platform_device(hba->dev);
> @@ -279,6 +300,80 @@ int ufshcd_mcq_memory_alloc(struct ufs_hba *hba)
> return 0;
> }
>
> +/* Operation and runtime registers configuration */
> +#define MCQ_CFG_n(r, i) ((r) + MCQ_QCFG_SIZE * (i))
> +#define MCQ_OPR_OFFSET_n(p, i) \
> + (hba->mcq_opr[(p)].offset + hba->mcq_opr[(p)].stride * (i))
> +
> +static void __iomem *mcq_opr_base(struct ufs_hba *hba,
> + enum ufshcd_mcq_opr n, int i)
> +{
> + struct ufshcd_mcq_opr_info_t *opr = &hba->mcq_opr[n];
> +
> + return opr->base + opr->stride * i;
> +}
> +
> +void ufshcd_mcq_make_queues_operational(struct ufs_hba *hba)
> +{
> + struct ufs_hw_queue *hwq;
> + u16 qsize;
> + int i;
> +
> + for (i = 0; i < hba->nr_hw_queues; i++) {
> + hwq = &hba->uhq[i];
> + hwq->id = i;
> + qsize = hwq->max_entries * MCQ_ENTRY_SIZE_IN_DWORD - 1;
> +
> + /* Submission Queue Lower Base Address */
> + ufsmcq_writelx(hba, lower_32_bits(hwq->sqe_dma_addr),
> + MCQ_CFG_n(REG_SQLBA, i));
> + /* Submission Queue Upper Base Address */
> + ufsmcq_writelx(hba, upper_32_bits(hwq->sqe_dma_addr),
> + MCQ_CFG_n(REG_SQUBA, i));
> + /* Submission Queue Doorbell Address Offset */
> + ufsmcq_writelx(hba, MCQ_OPR_OFFSET_n(OPR_SQD, i),
> + MCQ_CFG_n(REG_SQDAO, i));
> + /* Submission Queue Interrupt Status Address Offset */
> + ufsmcq_writelx(hba, MCQ_OPR_OFFSET_n(OPR_SQIS, i),
> + MCQ_CFG_n(REG_SQISAO, i));
> +
> + /* Completion Queue Lower Base Address */
> + ufsmcq_writelx(hba, lower_32_bits(hwq->cqe_dma_addr),
> + MCQ_CFG_n(REG_CQLBA, i));
> + /* Completion Queue Upper Base Address */
> + ufsmcq_writelx(hba, upper_32_bits(hwq->cqe_dma_addr),
> + MCQ_CFG_n(REG_CQUBA, i));
> + /* Completion Queue Doorbell Address Offset */
> + ufsmcq_writelx(hba, MCQ_OPR_OFFSET_n(OPR_CQD, i),
> + MCQ_CFG_n(REG_CQDAO, i));
> + /* Completion Queue Interrupt Status Address Offset */
> + ufsmcq_writelx(hba, MCQ_OPR_OFFSET_n(OPR_CQIS, i),
> + MCQ_CFG_n(REG_CQISAO, i));
> +
> + /* Save the base addresses for quicker access */
> + hwq->mcq_sq_head = mcq_opr_base(hba, OPR_SQD, i) + REG_SQHP;
> + hwq->mcq_sq_tail = mcq_opr_base(hba, OPR_SQD, i) + REG_SQTP;
> + hwq->mcq_cq_head = mcq_opr_base(hba, OPR_CQD, i) + REG_CQHP;
> + hwq->mcq_cq_tail = mcq_opr_base(hba, OPR_CQD, i) + REG_CQTP;
> +
> + /* Enable Tail Entry Push Status interrupt only for non-poll queues */
> + if (i < hba->nr_hw_queues - hba->nr_queues[HCTX_TYPE_POLL])
> + writel(1, mcq_opr_base(hba, OPR_CQIS, i) + REG_CQIE);
> +
> + /* Completion Queue Enable|Size to Completion Queue Attribute */
> + ufsmcq_writel(hba, (1 << QUEUE_EN_OFFSET) | qsize,
> + MCQ_CFG_n(REG_CQATTR, i));
> +
> + /*
> + * Submission Qeueue Enable|Size|Completion Queue ID to
> + * Submission Queue Attribute
> + */
> + ufsmcq_writel(hba, (1 << QUEUE_EN_OFFSET) | qsize |
> + (i << QUEUE_ID_OFFSET),
> + MCQ_CFG_n(REG_SQATTR, i));
> + }
> +}
> +
> int ufshcd_mcq_init(struct ufs_hba *hba)
> {
> struct ufs_hw_queue *hwq;
> @@ -292,6 +387,12 @@ 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 4d2bde2..08963e1 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
> @@ -237,6 +240,14 @@ 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 45686e8..042ecf04 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
>
> @@ -8252,6 +8258,20 @@ 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
> @@ -8281,6 +8301,10 @@ 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)
> @@ -8313,9 +8337,13 @@ 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);
> }
> }
>
> +
> ufshcd_tune_unipro_params(hba);
>
> /* UFS device is also active now */
> diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
> index 7bd3c37..dd53e85 100644
> --- a/drivers/ufs/host/ufs-qcom.c
> +++ b/drivers/ufs/host/ufs-qcom.c
> @@ -1425,6 +1425,29 @@ static void ufs_qcom_config_scaling_param(struct ufs_hba *hba,
> }
> #endif
>
> +static int ufs_qcom_op_runtime_config(struct ufs_hba *hba)
> +{
> + struct ufshcd_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 */
> @@ -1455,6 +1478,7 @@ static const struct ufs_hba_variant_ops ufs_hba_qcom_vops = {
> .config_scaling_param = ufs_qcom_config_scaling_param,
> .program_key = ufs_qcom_ice_program_key,
> .get_hba_mac = ufs_qcom_get_hba_mac,
> + .op_runtime_config = ufs_qcom_op_runtime_config,
> };
>
> /**
> diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h
> index e478bab..76972fc 100644
> --- a/include/ufs/ufshcd.h
> +++ b/include/ufs/ufshcd.h
> @@ -298,6 +298,7 @@ struct ufs_pwr_mode_info {
> * @program_key: program or evict an inline encryption key
> * @event_notify: called to notify important events
> * @get_hba_mac: called to get vendor specific mac value, mandatory for mcq mode
> + * @op_runtime_config: called to config Operation and runtime regs Pointers
> */
> struct ufs_hba_variant_ops {
> const char *name;
> @@ -337,6 +338,7 @@ struct ufs_hba_variant_ops {
> void (*event_notify)(struct ufs_hba *hba,
> enum ufs_event_type evt, void *data);
> int (*get_hba_mac)(struct ufs_hba *hba);
> + int (*op_runtime_config)(struct ufs_hba *hba);
> };
>
> /* clock gating state */
> @@ -750,6 +752,27 @@ 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
> @@ -859,6 +882,7 @@ enum ufshcd_res {
> * ufshcd_resume_complete()
> * @ext_iid_sup: is EXT_IID is supported by UFSHC
> * @mcq_sup: is mcq supported by UFSHC
> + * @mcq_enabled: is mcq ready to accept requests
> * @nr_hw_queues: number of hardware queues configured
> * @nr_queues: number of Queues of different queue types
> * @res: array of resource info of MCQ registers
> @@ -1016,29 +1040,47 @@ struct ufs_hba {
> bool complete_put;
> bool ext_iid_sup;
> bool mcq_sup;
> + bool mcq_enabled;
> unsigned int nr_hw_queues;
> unsigned int nr_queues[HCTX_MAX_TYPES];
> struct ufshcd_res_info res[RES_MAX];
> void __iomem *mcq_base;
> struct ufs_hw_queue *uhq;
> struct ufs_hw_queue *dev_cmd_queue;
> + struct ufshcd_mcq_opr_info_t mcq_opr[OPR_MAX];
> };
>
> /**
> + * @mcq_sq_head: base address of submission queue head pointer
> + * @mcq_sq_tail: base address of submission queue tail pointer
> + * @mcq_cq_head: base address of completion queue head pointer
> + * @mcq_cq_tail: base address of completion queue tail pointer
> * @sqe_base_addr: submission queue entry base address
> * @sqe_dma_addr: submission queue dma address
> * @cqe_base_addr: completion queue base address
> * @cqe_dma_addr: completion queue dma address
> * @max_entries: max number of slots in this hardware queue
> + * @id: hardware queue ID
> */
> struct ufs_hw_queue {
> + void __iomem *mcq_sq_head;
> + void __iomem *mcq_sq_tail;
> + void __iomem *mcq_cq_head;
> + void __iomem *mcq_cq_tail;
> +
> void *sqe_base_addr;
> dma_addr_t sqe_dma_addr;
> struct cq_entry *cqe_base_addr;
> dma_addr_t cqe_dma_addr;
> u32 max_entries;
> + u32 id;
> };
>
> +static inline bool is_mcq_enabled(struct ufs_hba *hba)
> +{
> + return hba->mcq_enabled;
> +}
> +
> /* Returns true if clocks can be gated. Otherwise false */
> static inline bool ufshcd_is_clkgating_allowed(struct ufs_hba *hba)
> {
> @@ -1094,6 +1136,16 @@ 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 1aae5b2..c85bdf2 100644
> --- a/include/ufs/ufshci.h
> +++ b/include/ufs/ufshci.h
> @@ -57,6 +57,7 @@ enum {
> REG_UFS_CCAP = 0x100,
> REG_UFS_CRYPTOCAP = 0x104,
>
> + REG_UFS_MEM_CFG = 0x300,
> REG_UFS_MCQ_CFG = 0x380,
> UFSHCI_CRYPTO_REG_SPACE_SIZE = 0x400,
> };
> @@ -78,6 +79,35 @@ enum {
> MASK_EXT_IID_SUPPORT = 0x00000400,
> };
>
> +enum {
> + REG_SQATTR = 0x0,
> + REG_SQLBA = 0x4,
> + REG_SQUBA = 0x8,
> + REG_SQDAO = 0xC,
> + REG_SQISAO = 0x10,
> +
> + REG_CQATTR = 0x20,
> + REG_CQLBA = 0x24,
> + REG_CQUBA = 0x28,
> + REG_CQDAO = 0x2C,
> + REG_CQISAO = 0x30,
> +};
> +
> +enum {
> + REG_SQHP = 0x0,
> + REG_SQTP = 0x4,
> +};
> +
> +enum {
> + REG_CQHP = 0x0,
> + REG_CQTP = 0x4,
> +};
> +
> +enum {
> + REG_CQIS = 0x0,
> + REG_CQIE = 0x4,
> +};
> +
> #define UFS_MASK(mask, offset) ((mask) << (offset))
>
> /* UFS Version 08h */
> @@ -134,6 +164,7 @@ static inline u32 ufshci_version(u32 major, u32 minor)
> #define CONTROLLER_FATAL_ERROR 0x10000
> #define SYSTEM_BUS_FATAL_ERROR 0x20000
> #define CRYPTO_ENGINE_FATAL_ERROR 0x40000
> +#define MCQ_CQ_EVENT_STATUS 0x100000
>
> #define UFSHCD_UIC_HIBERN8_MASK (UIC_HIBERNATE_ENTER |\
> UIC_HIBERNATE_EXIT)
> --
> 2.7.4
>

--
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