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Message-ID: <20221128151512.GF62721@thinkpad>
Date: Mon, 28 Nov 2022 20:45:12 +0530
From: Manivannan Sadhasivam <mani@...nel.org>
To: Asutosh Das <quic_asutoshd@...cinc.com>
Cc: quic_cang@...cinc.com, martin.petersen@...cle.com,
linux-scsi@...r.kernel.org, quic_nguyenb@...cinc.com,
quic_xiaosenh@...cinc.com, stanley.chu@...iatek.com,
eddie.huang@...iatek.com, daejun7.park@...sung.com,
bvanassche@....org, avri.altman@....com, beanhuo@...ron.com,
linux-arm-msm@...r.kernel.org,
Alim Akhtar <alim.akhtar@...sung.com>,
"James E.J. Bottomley" <jejb@...ux.ibm.com>,
Andy Gross <agross@...nel.org>,
Bjorn Andersson <andersson@...nel.org>,
Konrad Dybcio <konrad.dybcio@...ainline.org>,
Jinyoung Choi <j-young.choi@...sung.com>,
Arthur Simchaev <Arthur.Simchaev@....com>,
Kiwoong Kim <kwmad.kim@...sung.com>,
open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 07/16] ufs: core: mcq: Calculate queue depth
On Tue, Nov 22, 2022 at 08:10:20PM -0800, Asutosh Das wrote:
> The ufs device defines the supported queuedepth by
> bqueuedepth which has a max value of 256.
> The HC defines MAC (Max Active Commands) that define
> the max number of commands that in flight to the ufs
> device.
> Calculate and configure the nutrs based on both these
> values.
>
> Co-developed-by: Can Guo <quic_cang@...cinc.com>
> Signed-off-by: Can Guo <quic_cang@...cinc.com>
> Signed-off-by: Asutosh Das <quic_asutoshd@...cinc.com>
> ---
> drivers/ufs/core/ufs-mcq.c | 32 ++++++++++++++++++++++++++++++++
> drivers/ufs/core/ufshcd-priv.h | 9 +++++++++
> drivers/ufs/core/ufshcd.c | 17 ++++++++++++++++-
> drivers/ufs/host/ufs-qcom.c | 8 ++++++++
> include/ufs/ufs.h | 2 ++
> include/ufs/ufshcd.h | 2 ++
> include/ufs/ufshci.h | 1 +
> 7 files changed, 70 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/ufs/core/ufs-mcq.c b/drivers/ufs/core/ufs-mcq.c
> index 4aaa6aa..e95f748 100644
> --- a/drivers/ufs/core/ufs-mcq.c
> +++ b/drivers/ufs/core/ufs-mcq.c
> @@ -18,6 +18,8 @@
> #define UFS_MCQ_NUM_DEV_CMD_QUEUES 1
> #define UFS_MCQ_MIN_POLL_QUEUES 0
>
> +#define MAX_DEV_CMD_ENTRIES 2
> +#define MCQ_CFG_MAC_MASK GENMASK(16, 8)
> #define MCQ_QCFGPTR_MASK GENMASK(7, 0)
> #define MCQ_QCFGPTR_UNIT 0x200
> #define MCQ_SQATTR_OFFSET(c) \
> @@ -88,6 +90,36 @@ static const struct ufshcd_res_info ufs_res_info[RES_MAX] = {
> {.name = "mcq_vs",},
> };
>
> +/**
> + * ufshcd_mcq_decide_queue_depth - decide the queue depth
> + * @hba - per adapter instance
> + *
Kernel doc should define the return value also.
> + * MAC - Max. Active Command of the Host Controller (HC)
> + * HC wouldn't send more than this commands to the device.
> + * It is mandatory to implement get_hba_mac() to enable MCQ mode.
> + * Calculates and adjusts the queue depth based on the depth
> + * supported by the HC and ufs device.
> + */
> +int ufshcd_mcq_decide_queue_depth(struct ufs_hba *hba)
> +{
> + int mac;
> +
> + /* Mandatory to implement get_hba_mac() */
> + mac = ufshcd_mcq_vops_get_hba_mac(hba);
> + if (mac < 0) {
> + dev_err(hba->dev, "Failed to get mac, err=%d\n", mac);
> + return mac;
> + }
> +
> + WARN_ON(!hba->dev_info.bqueuedepth);
Instead of panic, you could just print and return an error.
> + /*
> + * max. value of bqueuedepth = 256, mac is host dependent.
> + * It is mandatory for UFS device to define bQueueDepth if
> + * shared queuing architecture is enabled.
> + */
> + return min_t(int, mac, hba->dev_info.bqueuedepth);
> +}
> +
> static int ufshcd_mcq_config_resource(struct ufs_hba *hba)
> {
> struct platform_device *pdev = to_platform_device(hba->dev);
> diff --git a/drivers/ufs/core/ufshcd-priv.h b/drivers/ufs/core/ufshcd-priv.h
> index 9368ba2..9f40fa5 100644
> --- a/drivers/ufs/core/ufshcd-priv.h
> +++ b/drivers/ufs/core/ufshcd-priv.h
> @@ -62,6 +62,7 @@ int ufshcd_query_flag(struct ufs_hba *hba, enum query_opcode opcode,
> enum flag_idn idn, u8 index, bool *flag_res);
> 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);
>
> #define SD_ASCII_STD true
> #define SD_RAW false
> @@ -227,6 +228,14 @@ static inline void ufshcd_vops_config_scaling_param(struct ufs_hba *hba,
> hba->vops->config_scaling_param(hba, p, data);
> }
>
> +static inline int ufshcd_mcq_vops_get_hba_mac(struct ufs_hba *hba)
Again, no inline please.
> +{
> + 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[];
>
> /**
> diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
> index 0c4cd8f..ae065da 100644
> --- a/drivers/ufs/core/ufshcd.c
> +++ b/drivers/ufs/core/ufshcd.c
> @@ -7783,6 +7783,7 @@ 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];
> @@ -8198,7 +8199,21 @@ static int ufshcd_add_lus(struct ufs_hba *hba)
>
> static int ufshcd_alloc_mcq(struct ufs_hba *hba)
> {
> - return ufshcd_mcq_init(hba);
> + int ret;
> + int old_nutrs = hba->nutrs;
> +
> + ret = ufshcd_mcq_decide_queue_depth(hba);
> + if (ret < 0)
> + return ret;
> +
> + hba->nutrs = ret;
> + ret = ufshcd_mcq_init(hba);
> + if (ret) {
> + hba->nutrs = old_nutrs;
> + return ret;
> + }
> +
> + return 0;
> }
>
> /**
> diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
> index 8ad1415..7bd3c37 100644
> --- a/drivers/ufs/host/ufs-qcom.c
> +++ b/drivers/ufs/host/ufs-qcom.c
> @@ -25,6 +25,7 @@
> #define UFS_QCOM_DEFAULT_DBG_PRINT_EN \
> (UFS_QCOM_DBG_PRINT_REGS_EN | UFS_QCOM_DBG_PRINT_TEST_BUS_EN)
>
> +#define MAX_SUPP_MAC 64
Similar definitions are part of ufs-qcom.h.
Thanks,
Mani
> enum {
> TSTBUS_UAWM,
> TSTBUS_UARM,
> @@ -1424,6 +1425,12 @@ static void ufs_qcom_config_scaling_param(struct ufs_hba *hba,
> }
> #endif
>
> +static int ufs_qcom_get_hba_mac(struct ufs_hba *hba)
> +{
> + /* Qualcomm HC supports up to 64 */
> + return MAX_SUPP_MAC;
> +}
> +
> /*
> * struct ufs_hba_qcom_vops - UFS QCOM specific variant operations
> *
> @@ -1447,6 +1454,7 @@ 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_hba_mac = ufs_qcom_get_hba_mac,
> };
>
> /**
> diff --git a/include/ufs/ufs.h b/include/ufs/ufs.h
> index ba2a1d8..5112418 100644
> --- a/include/ufs/ufs.h
> +++ b/include/ufs/ufs.h
> @@ -591,6 +591,8 @@ struct ufs_dev_info {
> u8 *model;
> u16 wspecversion;
> u32 clk_gating_wait_us;
> + /* Stores the depth of queue in UFS device */
> + u8 bqueuedepth;
>
> /* UFS HPB related flag */
> bool hpb_enabled;
> diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h
> index 7bf7599..e03b310 100644
> --- a/include/ufs/ufshcd.h
> +++ b/include/ufs/ufshcd.h
> @@ -297,6 +297,7 @@ 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_hba_mac: called to get vendor specific mac value, mandatory for mcq mode
> */
> struct ufs_hba_variant_ops {
> const char *name;
> @@ -335,6 +336,7 @@ 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_hba_mac)(struct ufs_hba *hba);
> };
>
> /* clock gating state */
> diff --git a/include/ufs/ufshci.h b/include/ufs/ufshci.h
> index 4d4da06..67fcebd 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_MCQ_CFG = 0x380,
> UFSHCI_CRYPTO_REG_SPACE_SIZE = 0x400,
> };
>
> --
> 2.7.4
>
--
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