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SubjectRe: [PATCH v3 1/9] ufs: sysfs: device descriptor
On 12/28, Stanislav Nijnikov wrote:
> This patch introduces a sysfs group entry for the UFS device descriptor
> parameters. The group adds "device_descriptor" folder under the UFS driver
> sysfs entry (/sys/bus/platform/drivers/ufshcd/*). The parameters are shown
> as hexadecimal numbers. The full information about the parameters could be
> found at UFS specifications 2.1.
>
> Signed-off-by: Stanislav Nijnikov <stanislav.nijnikov@wdc.com>
> ---
> Documentation/ABI/testing/sysfs-driver-ufs | 223 +++++++++++++++++++++++++++++
> drivers/scsi/ufs/Makefile | 3 +-
> drivers/scsi/ufs/ufs-sysfs.c | 170 ++++++++++++++++++++++
> drivers/scsi/ufs/ufs-sysfs.h | 25 ++++
> drivers/scsi/ufs/ufs.h | 8 ++
> drivers/scsi/ufs/ufshcd.c | 12 +-
> drivers/scsi/ufs/ufshcd.h | 4 +
> 7 files changed, 439 insertions(+), 6 deletions(-)
> create mode 100644 Documentation/ABI/testing/sysfs-driver-ufs
> create mode 100644 drivers/scsi/ufs/ufs-sysfs.c
> create mode 100644 drivers/scsi/ufs/ufs-sysfs.h
>
> diff --git a/Documentation/ABI/testing/sysfs-driver-ufs b/Documentation/ABI/testing/sysfs-driver-ufs
> new file mode 100644
> index 0000000..17cc4aa
> --- /dev/null
> +++ b/Documentation/ABI/testing/sysfs-driver-ufs

[snip]

> diff --git a/drivers/scsi/ufs/Makefile b/drivers/scsi/ufs/Makefile
> index 9310c6c..918f579 100644
> --- a/drivers/scsi/ufs/Makefile
> +++ b/drivers/scsi/ufs/Makefile
> @@ -3,6 +3,7 @@
> obj-$(CONFIG_SCSI_UFS_DWC_TC_PCI) += tc-dwc-g210-pci.o ufshcd-dwc.o tc-dwc-g210.o
> obj-$(CONFIG_SCSI_UFS_DWC_TC_PLATFORM) += tc-dwc-g210-pltfrm.o ufshcd-dwc.o tc-dwc-g210.o
> obj-$(CONFIG_SCSI_UFS_QCOM) += ufs-qcom.o
> -obj-$(CONFIG_SCSI_UFSHCD) += ufshcd.o
> +obj-$(CONFIG_SCSI_UFSHCD) += ufshcd-core.o
> +ufshcd-core-objs := ufshcd.o ufs-sysfs.o

Why not just adding ufs-sysfs.o in the existing configuration?

> obj-$(CONFIG_SCSI_UFSHCD_PCI) += ufshcd-pci.o
> obj-$(CONFIG_SCSI_UFSHCD_PLATFORM) += ufshcd-pltfrm.o
> diff --git a/drivers/scsi/ufs/ufs-sysfs.c b/drivers/scsi/ufs/ufs-sysfs.c
> new file mode 100644
> index 0000000..1c685f3
> --- /dev/null
> +++ b/drivers/scsi/ufs/ufs-sysfs.c
> @@ -0,0 +1,170 @@
> +/*
> +* UFS Device Management sysfs
> +*
> +* Copyright (C) 2017 Western Digital Corporation
> +*
> +* This program is free software; you can redistribute it and/or
> +* modify it under the terms of the GNU General Public License version
> +* 2 as published by the Free Software Foundation.
> +*
> +* This program is distributed in the hope that it will be useful, but
> +* WITHOUT ANY WARRANTY; without even the implied warranty of
> +* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> +* General Public License for more details.
> +*
> +*/
> +
> +#include <linux/err.h>
> +#include <linux/string.h>
> +
> +#include "ufs.h"
> +#include "ufs-sysfs.h"
> +/* collision between the device descriptor parameter and the definition */
> +#undef DEVICE_CLASS

Does this make sense? How about attaching "_" for all the macro like
_DEVICE_CLASS below?

> +
> +enum ufs_desc_param_size {
> + UFS_PARAM_BYTE_SIZE = 1,
> + UFS_PARAM_WORD_SIZE = 2,
> + UFS_PARAM_DWORD_SIZE = 4,
> + UFS_PARAM_QWORD_SIZE = 8,
> +};
> +
> +static inline ssize_t ufs_sysfs_read_desc_param(
> + struct ufs_hba *hba, u8 desc_idn, u8 index, char *buf, u8 off,
> + enum ufs_desc_param_size param_size)
> +{
> + int desc_len;
> + int ret;
> + u8 *desc_buf;
> +
> + if (ufshcd_map_desc_id_to_length(hba, desc_idn, &desc_len) ||
> + off >= desc_len)
> + return -EINVAL;
> + desc_buf = kzalloc(desc_len, GFP_ATOMIC);
> + if (!desc_buf)
> + return -ENOMEM;
> + ret = ufshcd_query_descriptor_retry(hba, UPIU_QUERY_OPCODE_READ_DESC,
> + desc_idn, index, 0, desc_buf, &desc_len);
> + if (ret)

Should free desc_buf here.

> + return -EINVAL;
> + switch (param_size) {
> + case UFS_PARAM_BYTE_SIZE:
> + ret = sprintf(buf, "0x%02X\n", desc_buf[off]);
> + break;
> + case UFS_PARAM_WORD_SIZE:
> + ret = sprintf(buf, "0x%04X\n",
> + be16_to_cpu(*((u16 *)(desc_buf + off))));
> + break;
> + case UFS_PARAM_DWORD_SIZE:
> + ret = sprintf(buf, "0x%08X\n",
> + be32_to_cpu(*((u32 *)(desc_buf + off))));
> + break;
> + case UFS_PARAM_QWORD_SIZE:
> + ret = sprintf(buf, "0x%016llX\n",
> + be64_to_cpu(*((u64 *)(desc_buf + off))));
> + break;
> + }
> + kfree(desc_buf);
> +
> + return ret;
> +}
> +
> +#define ufs_sysfs_desc_param_show(_name, _puname, _duname, _size) \
> +static ssize_t _name##_show(struct device *dev, \
> + struct device_attribute *attr, char *buf) \
> +{ \
> + struct ufs_hba *hba = dev_get_drvdata(dev); \
> + return ufs_sysfs_read_desc_param(hba, QUERY_DESC_IDN_##_duname, \
> + 0, buf, _duname##_DESC_PARAM_##_puname, \
> + UFS_PARAM_##_size##_SIZE); \
> +}
> +
> +#define UFS_DESC_PARAM(_pname, _puname, _duname, _size) \
> + ufs_sysfs_desc_param_show(_pname, _puname, _duname, _size) \
> + static DEVICE_ATTR_RO(_pname)
> +
> +#define UFS_DEVICE_DESC_PARAM(_name, _uname, _size) \
> + UFS_DESC_PARAM(_name, _uname, DEVICE, _size)
> +
> +UFS_DEVICE_DESC_PARAM(device_type, DEVICE_TYPE, BYTE);
> +UFS_DEVICE_DESC_PARAM(device_class, DEVICE_CLASS, BYTE);
> +UFS_DEVICE_DESC_PARAM(device_sub_class, DEVICE_SUB_CLASS, BYTE);
> +UFS_DEVICE_DESC_PARAM(protocol, PRTCL, BYTE);
> +UFS_DEVICE_DESC_PARAM(number_of_luns, NUM_LU, BYTE);
> +UFS_DEVICE_DESC_PARAM(number_of_wluns, NUM_WLU, BYTE);
> +UFS_DEVICE_DESC_PARAM(boot_enable, BOOT_ENBL, BYTE);
> +UFS_DEVICE_DESC_PARAM(descriptor_access_enable, DESC_ACCSS_ENBL, BYTE);
> +UFS_DEVICE_DESC_PARAM(initial_power_mode, INIT_PWR_MODE, BYTE);
> +UFS_DEVICE_DESC_PARAM(high_priority_lun, HIGH_PR_LUN, BYTE);
> +UFS_DEVICE_DESC_PARAM(secure_removal_type, SEC_RMV_TYPE, BYTE);
> +UFS_DEVICE_DESC_PARAM(support_security_lun, SEC_LU, BYTE);
> +UFS_DEVICE_DESC_PARAM(bkops_termination_latency, BKOP_TERM_LT, BYTE);
> +UFS_DEVICE_DESC_PARAM(initial_active_icc_level, ACTVE_ICC_LVL, BYTE);
> +UFS_DEVICE_DESC_PARAM(specification_version, SPEC_VER, WORD);
> +UFS_DEVICE_DESC_PARAM(manufacturing_date, MANF_DATE, WORD);
> +UFS_DEVICE_DESC_PARAM(manufacturer_id, MANF_ID, WORD);
> +UFS_DEVICE_DESC_PARAM(rtt_capability, RTT_CAP, BYTE);
> +UFS_DEVICE_DESC_PARAM(rtc_update, FRQ_RTC, WORD);
> +UFS_DEVICE_DESC_PARAM(ufs_features, UFS_FEAT, BYTE);
> +UFS_DEVICE_DESC_PARAM(ffu_timeout, FFU_TMT, BYTE);
> +UFS_DEVICE_DESC_PARAM(queue_depth, Q_DPTH, BYTE);
> +UFS_DEVICE_DESC_PARAM(device_version, DEV_VER, WORD);
> +UFS_DEVICE_DESC_PARAM(number_of_secure_wpa, NUM_SEC_WPA, BYTE);
> +UFS_DEVICE_DESC_PARAM(psa_max_data_size, PSA_MAX_DATA, DWORD);
> +UFS_DEVICE_DESC_PARAM(psa_state_timeout, PSA_TMT, BYTE);
> +
> +static struct attribute *ufs_sysfs_device_descriptor[] = {
> + &dev_attr_device_type.attr,
> + &dev_attr_device_class.attr,
> + &dev_attr_device_sub_class.attr,
> + &dev_attr_protocol.attr,
> + &dev_attr_number_of_luns.attr,
> + &dev_attr_number_of_wluns.attr,
> + &dev_attr_boot_enable.attr,
> + &dev_attr_descriptor_access_enable.attr,
> + &dev_attr_initial_power_mode.attr,
> + &dev_attr_high_priority_lun.attr,
> + &dev_attr_secure_removal_type.attr,
> + &dev_attr_support_security_lun.attr,
> + &dev_attr_bkops_termination_latency.attr,
> + &dev_attr_initial_active_icc_level.attr,
> + &dev_attr_specification_version.attr,
> + &dev_attr_manufacturing_date.attr,
> + &dev_attr_manufacturer_id.attr,
> + &dev_attr_rtt_capability.attr,
> + &dev_attr_rtc_update.attr,
> + &dev_attr_ufs_features.attr,
> + &dev_attr_ffu_timeout.attr,
> + &dev_attr_queue_depth.attr,
> + &dev_attr_device_version.attr,
> + &dev_attr_number_of_secure_wpa.attr,
> + &dev_attr_psa_max_data_size.attr,
> + &dev_attr_psa_state_timeout.attr,
> + NULL,
> +};
> +
> +static const struct attribute_group ufs_sysfs_device_descriptor_group = {
> + .name = "device_descriptor",
> + .attrs = ufs_sysfs_device_descriptor,
> +};
> +
> +static const struct attribute_group *ufs_sysfs_groups[] = {
> + &ufs_sysfs_device_descriptor_group,
> + NULL,
> +};
> +
> +void ufs_sysfs_add_device_management(struct ufs_hba *hba)
> +{
> + int ret;
> +
> + ret = sysfs_create_groups(&hba->dev->kobj, ufs_sysfs_groups);
> + if (ret)
> + dev_err(hba->dev,
> + "%s: sysfs groups creation failed (err = %d)\n",
> + __func__, ret);
> +}
> +
> +void ufs_sysfs_remove_device_management(struct ufs_hba *hba)
> +{
> + sysfs_remove_groups(&hba->dev->kobj, ufs_sysfs_groups);
> +}
> diff --git a/drivers/scsi/ufs/ufs-sysfs.h b/drivers/scsi/ufs/ufs-sysfs.h
> new file mode 100644
> index 0000000..a1fc9dc
> --- /dev/null
> +++ b/drivers/scsi/ufs/ufs-sysfs.h
> @@ -0,0 +1,25 @@
> +/*
> +* UFS Device Management sysfs
> +*
> +* Copyright (C) 2017 Western Digital Corporation
> +*
> +* This program is free software; you can redistribute it and/or
> +* modify it under the terms of the GNU General Public License version
> +* 2 as published by the Free Software Foundation.
> +*
> +* This program is distributed in the hope that it will be useful, but
> +* WITHOUT ANY WARRANTY; without even the implied warranty of
> +* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> +* General Public License for more details.
> +*
> +*/
> +#ifndef __UFS_SYSFS_H__
> +#define __UFS_SYSFS_H__
> +
> +#include <linux/sysfs.h>
> +
> +#include "ufshcd.h"
> +
> +void ufs_sysfs_add_device_management(struct ufs_hba *hba);
> +void ufs_sysfs_remove_device_management(struct ufs_hba *hba);
> +#endif
> diff --git a/drivers/scsi/ufs/ufs.h b/drivers/scsi/ufs/ufs.h
> index 54deeb7..6ae1e08 100644
> --- a/drivers/scsi/ufs/ufs.h
> +++ b/drivers/scsi/ufs/ufs.h
> @@ -220,6 +220,14 @@ enum device_desc_param {
> DEVICE_DESC_PARAM_UD_LEN = 0x1B,
> DEVICE_DESC_PARAM_RTT_CAP = 0x1C,
> DEVICE_DESC_PARAM_FRQ_RTC = 0x1D,
> + DEVICE_DESC_PARAM_UFS_FEAT = 0x1F,
> + DEVICE_DESC_PARAM_FFU_TMT = 0x20,
> + DEVICE_DESC_PARAM_Q_DPTH = 0x21,
> + DEVICE_DESC_PARAM_DEV_VER = 0x22,
> + DEVICE_DESC_PARAM_NUM_SEC_WPA = 0x24,
> + DEVICE_DESC_PARAM_PSA_MAX_DATA = 0x25,
> + DEVICE_DESC_PARAM_PSA_TMT = 0x29,
> + DEVICE_DESC_PARAM_PRDCT_REV = 0x2A,
> };
>
> /*
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index a355d98..97dcb52 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -44,6 +44,7 @@
> #include "ufshcd.h"
> #include "ufs_quirks.h"
> #include "unipro.h"
> +#include "ufs-sysfs.h"
>
> #define CREATE_TRACE_POINTS
> #include <trace/events/ufs.h>
> @@ -2894,11 +2895,10 @@ static int __ufshcd_query_descriptor(struct ufs_hba *hba,
> * The buf_len parameter will contain, on return, the length parameter
> * received on the response.
> */
> -static int ufshcd_query_descriptor_retry(struct ufs_hba *hba,
> - enum query_opcode opcode,
> - enum desc_idn idn, u8 index,
> - u8 selector,
> - u8 *desc_buf, int *buf_len)
> +int ufshcd_query_descriptor_retry(struct ufs_hba *hba,
> + enum query_opcode opcode,
> + enum desc_idn idn, u8 index, u8 selector,
> + u8 *desc_buf, int *buf_len)
> {
> int err;
> int retries;
> @@ -7704,10 +7704,12 @@ static inline void ufshcd_add_sysfs_nodes(struct ufs_hba *hba)
> {
> ufshcd_add_rpm_lvl_sysfs_nodes(hba);
> ufshcd_add_spm_lvl_sysfs_nodes(hba);
> + ufs_sysfs_add_device_management(hba);

IMO, ufs-sysfs.c must have the existing entries above, rpm/spm, as a default
group first, and then would be better to add device_descriptor_group on top of
it.

Thanks,

> }
>
> static inline void ufshcd_remove_sysfs_nodes(struct ufs_hba *hba)
> {
> + ufs_sysfs_remove_device_management(hba);
> device_remove_file(hba->dev, &hba->rpm_lvl_attr);
> device_remove_file(hba->dev, &hba->spm_lvl_attr);
> }
> diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
> index 1332e54..6a0ec4b 100644
> --- a/drivers/scsi/ufs/ufshcd.h
> +++ b/drivers/scsi/ufs/ufshcd.h
> @@ -841,6 +841,10 @@ static inline bool ufshcd_is_hs_mode(struct ufs_pa_layer_attr *pwr_info)
> }
>
> /* Expose Query-Request API */
> +int ufshcd_query_descriptor_retry(struct ufs_hba *hba,
> + enum query_opcode opcode,
> + enum desc_idn idn, u8 index, u8 selector,
> + u8 *desc_buf, int *buf_len);
> int ufshcd_query_flag(struct ufs_hba *hba, enum query_opcode opcode,
> enum flag_idn idn, bool *flag_res);
> int ufshcd_hold(struct ufs_hba *hba, bool async);
> --
> 2.7.4

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