Looks good to me.
Reviewed-by: Subhash Jadavani <subha...@codeaurora.org>
> This patch exposes the ioctl interface for UFS driver via SCSI device
> ioctl interface. As of now UFS driver would provide the ioctl for query
> interface to connected UFS device.
>
> Signed-off-by: Dolev Raviv <dra...@codeaurora.org>
> Signed-off-by: Noa Rubens <n...@codeaurora.org>
> Signed-off-by: Raviv Shvili <rshv...@codeaurora.org>
> Signed-off-by: Gilad Broner <gbro...@codeaurora.org>
> Signed-off-by: Yaniv Gardi <yga...@codeaurora.org>
> ---
> drivers/scsi/ufs/ufs.h | 53 +++--------
> drivers/scsi/ufs/ufshcd.c | 208
> +++++++++++++++++++++++++++++++++++++++++-
> include/uapi/scsi/Kbuild | 1 +
> include/uapi/scsi/ufs/Kbuild | 3 +
> include/uapi/scsi/ufs/ioctl.h | 58 ++++++++++++
> include/uapi/scsi/ufs/ufs.h | 67 ++++++++++++++
> 6 files changed, 347 insertions(+), 43 deletions(-)
> create mode 100644 include/uapi/scsi/ufs/Kbuild
> create mode 100644 include/uapi/scsi/ufs/ioctl.h
> create mode 100644 include/uapi/scsi/ufs/ufs.h
>
> diff --git a/drivers/scsi/ufs/ufs.h b/drivers/scsi/ufs/ufs.h
> index 05e0f23..eab739d 100644
> --- a/drivers/scsi/ufs/ufs.h
> +++ b/drivers/scsi/ufs/ufs.h
> @@ -38,6 +38,7 @@
>
> #include <linux/mutex.h>
> #include <linux/types.h>
> +#include <scsi/ufs/ufs.h>
>
> #define MAX_CDB_SIZE 16
> #define GENERAL_UPIU_REQUEST_SIZE 32
> @@ -72,6 +73,16 @@ enum {
> UFS_UPIU_RPMB_WLUN = 0xC4,
> };
>
> +/**
> + * ufs_is_valid_unit_desc_lun - checks if the given LUN has a unit
> descriptor
> + * @lun: LU number to check
> + * @return: true if the lun has a matching unit descriptor, false
> otherwise
> + */
> +static inline bool ufs_is_valid_unit_desc_lun(u8 lun)
> +{
> + return lun == UFS_UPIU_RPMB_WLUN || (lun < UFS_UPIU_MAX_GENERAL_LUN);
> +}
> +
> /*
> * UFS Protocol Information Unit related definitions
> */
> @@ -127,35 +138,6 @@ enum {
> UPIU_QUERY_FUNC_STANDARD_WRITE_REQUEST = 0x81,
> };
>
> -/* Flag idn for Query Requests*/
> -enum flag_idn {
> - QUERY_FLAG_IDN_FDEVICEINIT = 0x01,
> - QUERY_FLAG_IDN_PWR_ON_WPE = 0x03,
> - QUERY_FLAG_IDN_BKOPS_EN = 0x04,
> -};
> -
> -/* Attribute idn for Query requests */
> -enum attr_idn {
> - QUERY_ATTR_IDN_ACTIVE_ICC_LVL = 0x03,
> - QUERY_ATTR_IDN_BKOPS_STATUS = 0x05,
> - QUERY_ATTR_IDN_EE_CONTROL = 0x0D,
> - QUERY_ATTR_IDN_EE_STATUS = 0x0E,
> -};
> -
> -/* Descriptor idn for Query requests */
> -enum desc_idn {
> - QUERY_DESC_IDN_DEVICE = 0x0,
> - QUERY_DESC_IDN_CONFIGURAION = 0x1,
> - QUERY_DESC_IDN_UNIT = 0x2,
> - QUERY_DESC_IDN_RFU_0 = 0x3,
> - QUERY_DESC_IDN_INTERCONNECT = 0x4,
> - QUERY_DESC_IDN_STRING = 0x5,
> - QUERY_DESC_IDN_RFU_1 = 0x6,
> - QUERY_DESC_IDN_GEOMETRY = 0x7,
> - QUERY_DESC_IDN_POWER = 0x8,
> - QUERY_DESC_IDN_MAX,
> -};
> -
> enum desc_header_offset {
> QUERY_DESC_LENGTH_OFFSET = 0x00,
> QUERY_DESC_DESC_TYPE_OFFSET = 0x01,
> @@ -278,19 +260,6 @@ enum bkops_status {
> BKOPS_STATUS_MAX = BKOPS_STATUS_CRITICAL,
> };
>
> -/* UTP QUERY Transaction Specific Fields OpCode */
> -enum query_opcode {
> - UPIU_QUERY_OPCODE_NOP = 0x0,
> - UPIU_QUERY_OPCODE_READ_DESC = 0x1,
> - UPIU_QUERY_OPCODE_WRITE_DESC = 0x2,
> - UPIU_QUERY_OPCODE_READ_ATTR = 0x3,
> - UPIU_QUERY_OPCODE_WRITE_ATTR = 0x4,
> - UPIU_QUERY_OPCODE_READ_FLAG = 0x5,
> - UPIU_QUERY_OPCODE_SET_FLAG = 0x6,
> - UPIU_QUERY_OPCODE_CLEAR_FLAG = 0x7,
> - UPIU_QUERY_OPCODE_TOGGLE_FLAG = 0x8,
> -};
> -
> /* Query response result code */
> enum {
> QUERY_RESULT_SUCCESS = 0x00,
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index 786df28..efeb252 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -38,6 +38,7 @@
> */
>
> #include <linux/async.h>
> +#include <scsi/ufs/ioctl.h>
> #include <linux/devfreq.h>
> #include <linux/nls.h>
> #include <linux/of.h>
> @@ -2208,7 +2209,7 @@ static inline int ufshcd_read_unit_desc_param(struct
> ufs_hba *hba,
> * Unit descriptors are only available for general purpose LUs (LUN id
> * from 0 to 7) and RPMB Well known LU.
> */
> - if (lun != UFS_UPIU_RPMB_WLUN && (lun >= UFS_UPIU_MAX_GENERAL_LUN))
> + if (!ufs_is_valid_unit_desc_lun(lun))
> return -EOPNOTSUPP;
>
> return ufshcd_read_desc_param(hba, QUERY_DESC_IDN_UNIT, lun,
> @@ -5047,6 +5048,207 @@ out:
> }
>
> /**
> + * ufshcd_query_ioctl - perform user read queries
> + * @hba: per-adapter instance
> + * @lun: used for lun specific queries
> + * @buffer: user space buffer for reading and submitting query data and
> params
> + * @return: 0 for success negative error code otherwise
> + *
> + * Expected/Submitted buffer structure is struct ufs_ioctl_query_data.
> + * It will read the opcode, idn and buf_length parameters, and, put the
> + * response in the buffer field while updating the used size in
> buf_length.
> + */
> +static int ufshcd_query_ioctl(struct ufs_hba *hba, u8 lun, void __user
> *buffer)
> +{
> + struct ufs_ioctl_query_data ioctl_data;
> + int err = 0;
> + int length = 0;
> + void *data_ptr;
> + bool flag;
> + u32 att;
> + u8 index;
> + u8 *desc = NULL;
> +
> + /* extract params from user buffer */
> + if (copy_from_user(&ioctl_data, buffer,
> + sizeof(struct ufs_ioctl_query_data))) {
> + err = -EFAULT;
> + goto out;
> + }
> +
> + /* verify legal parameters & send query */
> + switch (ioctl_data.opcode) {
> + case UPIU_QUERY_OPCODE_READ_DESC:
> + switch (ioctl_data.idn) {
> + case QUERY_DESC_IDN_DEVICE:
> + case QUERY_DESC_IDN_CONFIGURAION:
> + case QUERY_DESC_IDN_INTERCONNECT:
> + case QUERY_DESC_IDN_GEOMETRY:
> + case QUERY_DESC_IDN_POWER:
> + index = 0;
> + break;
> + case QUERY_DESC_IDN_UNIT:
> + if (!ufs_is_valid_unit_desc_lun(lun)) {
> + dev_err(hba->dev,
> + "%s: No unit descriptor for lun 0x%x\n",
> + __func__, lun);
> + err = -EINVAL;
> + goto out;
> + }
> + index = lun;
> + break;
> + default:
> + goto out;
> + }
> +
> + if (ioctl_data.buf_size > QUERY_DESC_MAX_SIZE) {
> + err = -EINVAL;
> + goto out;
> + }
> +
> + desc = kzalloc(ioctl_data.buf_size, GFP_KERNEL);
> + if (!desc) {
> + err = -ENOMEM;
> + goto out;
> + }
> +
> + length = ioctl_data.buf_size;
> + err = ufshcd_query_descriptor(hba, ioctl_data.opcode,
> + ioctl_data.idn, index, 0, desc, &length);
> + break;
> + case UPIU_QUERY_OPCODE_READ_ATTR:
> + switch (ioctl_data.idn) {
> + case QUERY_ATTR_IDN_BOOT_LU_EN:
> + case QUERY_ATTR_IDN_POWER_MODE:
> + case QUERY_ATTR_IDN_ACTIVE_ICC_LVL:
> + case QUERY_ATTR_IDN_OOO_DATA_EN:
> + case QUERY_ATTR_IDN_BKOPS_STATUS:
> + case QUERY_ATTR_IDN_PURGE_STATUS:
> + case QUERY_ATTR_IDN_MAX_DATA_IN:
> + case QUERY_ATTR_IDN_MAX_DATA_OUT:
> + case QUERY_ATTR_IDN_REF_CLK_FREQ:
> + case QUERY_ATTR_IDN_CONF_DESC_LOCK:
> + case QUERY_ATTR_IDN_MAX_NUM_OF_RTT:
> + case QUERY_ATTR_IDN_EE_CONTROL:
> + case QUERY_ATTR_IDN_EE_STATUS:
> + case QUERY_ATTR_IDN_SECONDS_PASSED:
> + index = 0;
> + break;
> + case QUERY_ATTR_IDN_DYN_CAP_NEEDED:
> + case QUERY_ATTR_IDN_CORR_PRG_BLK_NUM:
> + index = lun;
> + break;
> + default:
> + goto out_einval;
> + }
> + err = ufshcd_query_attr(hba, ioctl_data.opcode,
> + ioctl_data.idn, index, 0, &att);
> + break;
> + case UPIU_QUERY_OPCODE_READ_FLAG:
> + switch (ioctl_data.idn) {
> + case QUERY_FLAG_IDN_FDEVICEINIT:
> + case QUERY_FLAG_IDN_PERMANENT_WPE:
> + case QUERY_FLAG_IDN_PWR_ON_WPE:
> + case QUERY_FLAG_IDN_BKOPS_EN:
> + case QUERY_FLAG_IDN_PURGE_ENABLE:
> + case QUERY_FLAG_IDN_FPHYRESOURCEREMOVAL:
> + case QUERY_FLAG_IDN_BUSY_RTC:
> + break;
> + default:
> + goto out_einval;
> + }
> + err = ufshcd_query_flag_retry(hba, ioctl_data.opcode,
> + ioctl_data.idn, &flag);
> + break;
> + default:
> + goto out_einval;
> + }
> +
> + if (err) {
> + dev_err(hba->dev, "%s: Query for idn %d failed\n", __func__,
> + ioctl_data.idn);
> + goto out_release_mem;
> + }
> +
> + /* copy response data */
> + switch (ioctl_data.opcode) {
> + case UPIU_QUERY_OPCODE_READ_DESC:
> + ioctl_data.buf_size = length;
> + data_ptr = desc;
> + break;
> + case UPIU_QUERY_OPCODE_READ_ATTR:
> + ioctl_data.buf_size = sizeof(u32);
> + data_ptr = &att;
> + break;
> + case UPIU_QUERY_OPCODE_READ_FLAG:
> + ioctl_data.buf_size = 1;
> + data_ptr = &flag;
> + break;
> + default:
> + BUG_ON(true);
> + }
> +
> + /* copy to user */
> + err = copy_to_user(buffer, &ioctl_data,
> + sizeof(struct ufs_ioctl_query_data));
> + if (err)
> + dev_err(hba->dev, "%s: Failed copying back to user.\n",
> + __func__);
> + err = copy_to_user(buffer + sizeof(struct ufs_ioctl_query_data),
> + data_ptr, ioctl_data.buf_size);
> + if (err)
> + dev_err(hba->dev, "%s: err %d copying back to user.\n",
> + __func__, err);
> + goto out_release_mem;
> +
> +out_einval:
> + dev_err(hba->dev,
> + "%s: illegal ufs query ioctl data, opcode 0x%x, idn 0x%x\n",
> + __func__, ioctl_data.opcode, (unsigned int)ioctl_data.idn);
> + err = -EINVAL;
> +out_release_mem:
> + kfree(desc);
> +out:
> + return err;
> +}
> +
> +/**
> + * ufshcd_ioctl - ufs ioctl callback registered in scsi_host
> + * @dev: scsi device required for per LUN queries
> + * @cmd: command opcode
> + * @buffer: user space buffer for transferring data
> + *
> + * Supported commands:
> + * UFS_IOCTL_QUERY
> + */
> +static int ufshcd_ioctl(struct scsi_device *dev, int cmd, void __user
> *buffer)
> +{
> + struct ufs_hba *hba = shost_priv(dev->host);
> + int err = 0;
> +
> + BUG_ON(!hba);
> + if (!buffer)
> + return -EINVAL;
> +
> + switch (cmd) {
> + case UFS_IOCTL_QUERY:
> + pm_runtime_get_sync(hba->dev);
> + err = ufshcd_query_ioctl(hba, ufshcd_scsi_to_upiu_lun(dev->lun),
> + buffer);
> + pm_runtime_put_sync(hba->dev);
> + break;
> + case BLKROSET:
> + err = -ENOIOCTLCMD;
> + break;
> + default:
> + err = -EINVAL;
> + break;
> + }
> +
> + return err;
> +}
> +
> +/**
> * ufshcd_async_scan - asynchronous execution for probing hba
> * @data: data pointer to pass to this function
> * @cookie: cookie data
> @@ -5106,6 +5308,10 @@ static struct scsi_host_template
> ufshcd_driver_template = {
> .eh_device_reset_handler = ufshcd_eh_device_reset_handler,
> .eh_host_reset_handler = ufshcd_eh_host_reset_handler,
> .eh_timed_out = ufshcd_eh_timed_out,
> + .ioctl = ufshcd_ioctl,
> +#ifdef CONFIG_COMPAT
> + .compat_ioctl = ufshcd_ioctl,
> +#endif
> .this_id = -1,
> .sg_tablesize = SG_ALL,
> .cmd_per_lun = UFSHCD_CMD_PER_LUN,
> diff --git a/include/uapi/scsi/Kbuild b/include/uapi/scsi/Kbuild
> index 75746d5..d404525 100644
> --- a/include/uapi/scsi/Kbuild
> +++ b/include/uapi/scsi/Kbuild
> @@ -1,5 +1,6 @@
> # UAPI Header export list
> header-y += fc/
> +header-y += ufs/
> header-y += scsi_bsg_fc.h
> header-y += scsi_netlink.h
> header-y += scsi_netlink_fc.h
> diff --git a/include/uapi/scsi/ufs/Kbuild b/include/uapi/scsi/ufs/Kbuild
> new file mode 100644
> index 0000000..cc3ef20
> --- /dev/null
> +++ b/include/uapi/scsi/ufs/Kbuild
> @@ -0,0 +1,3 @@
> +# UAPI Header export list
> +header-y += ioctl.h
> +header-y += ufs.h
> diff --git a/include/uapi/scsi/ufs/ioctl.h b/include/uapi/scsi/ufs/ioctl.h
> new file mode 100644
> index 0000000..3a8fa77
> --- /dev/null
> +++ b/include/uapi/scsi/ufs/ioctl.h
> @@ -0,0 +1,58 @@
> +#ifndef UAPI_UFS_IOCTL_H_
> +#define UAPI_UFS_IOCTL_H_
> +
> +#include <linux/types.h>
> +
> +/*
> + * IOCTL opcode for ufs queries has the following opcode after
> + * SCSI_IOCTL_GET_PCI
> + */
> +#define UFS_IOCTL_QUERY _IOWR('L', 0x88, struct
> ufs_ioctl_query_data)
> +
> +/**
> + * struct ufs_ioctl_query_data - used to transfer data to and from
> + * user via ioctl
> + * @opcode: type of data to query (descriptor/attribute/flag)
> + * @idn: id of the data structure
> + * @buf_size: number of allocated bytes/data size on return
> + * @buffer: data location
> + *
> + * Received: buffer and buf_size (available space for transferred data)
> + * Submitted: opcode, idn, length, buf_size
> + */
> +struct ufs_ioctl_query_data {
> + /*
> + * User should select one of the opcode defined in "enum query_opcode".
> + * Please check include/uapi/scsi/ufs/ufs.h for the definition of it.
> + * Note that only UPIU_QUERY_OPCODE_READ_DESC,
> + * UPIU_QUERY_OPCODE_READ_ATTR & UPIU_QUERY_OPCODE_READ_FLAG are
> + * supported as of now. All other query_opcode would be considered
> + * invalid.
> + * As of now only read query operations are supported.
> + */
> + __u32 opcode;
> + /*
> + * User should specify the size of the buffer (buffer[0] below) where
> + * it wants to read the query data (attribute/flag/descriptor).
> + * As we might end up reading less data then what is specified in
> + * buf_size. So we are updating buf_size to what exactly we have read.
> + */
> + __u16 buf_size;
> + /*
> + * User should select one of the idn from "enum flag_idn" or "enum
> + * attr_idn" or "enum desc_idn" based on whether opcode above is
> + * attribute, flag or descriptor.
> + * Please check include/uapi/scsi/ufs/ufs.h for the definition of it.
> + */
> + __u8 idn;
> + /*
> + * placeholder for the start of the data buffer where kernel will copy
> + * the query data (attribute/flag/descriptor) read from the UFS device
> + * Note:
> + * For Read Attribute you will have to allocate 4 bytes
> + * For Read Flag you will have to allocate 1 byte
> + */
> + __u8 buffer[0];
> +};
> +
> +#endif /* UAPI_UFS_IOCTL_H_ */
> diff --git a/include/uapi/scsi/ufs/ufs.h b/include/uapi/scsi/ufs/ufs.h
> new file mode 100644
> index 0000000..8e4baff
> --- /dev/null
> +++ b/include/uapi/scsi/ufs/ufs.h
> @@ -0,0 +1,67 @@
> +#ifndef UAPI_UFS_H_
> +#define UAPI_UFS_H_
> +
> +/* Flag idn for Query Requests*/
> +enum flag_idn {
> + QUERY_FLAG_IDN_FDEVICEINIT = 0x01,
> + QUERY_FLAG_IDN_PERMANENT_WPE = 0x02,
> + QUERY_FLAG_IDN_PWR_ON_WPE = 0x03,
> + QUERY_FLAG_IDN_BKOPS_EN = 0x04,
> + QUERY_FLAG_IDN_RESERVED1 = 0x05,
> + QUERY_FLAG_IDN_PURGE_ENABLE = 0x06,
> + QUERY_FLAG_IDN_RESERVED2 = 0x07,
> + QUERY_FLAG_IDN_FPHYRESOURCEREMOVAL = 0x08,
> + QUERY_FLAG_IDN_BUSY_RTC = 0x09,
> +};
> +
> +/* Attribute idn for Query requests */
> +enum attr_idn {
> + QUERY_ATTR_IDN_BOOT_LU_EN = 0x00,
> + QUERY_ATTR_IDN_RESERVED = 0x01,
> + QUERY_ATTR_IDN_POWER_MODE = 0x02,
> + QUERY_ATTR_IDN_ACTIVE_ICC_LVL = 0x03,
> + QUERY_ATTR_IDN_OOO_DATA_EN = 0x04,
> + QUERY_ATTR_IDN_BKOPS_STATUS = 0x05,
> + QUERY_ATTR_IDN_PURGE_STATUS = 0x06,
> + QUERY_ATTR_IDN_MAX_DATA_IN = 0x07,
> + QUERY_ATTR_IDN_MAX_DATA_OUT = 0x08,
> + QUERY_ATTR_IDN_DYN_CAP_NEEDED = 0x09,
> + QUERY_ATTR_IDN_REF_CLK_FREQ = 0x0A,
> + QUERY_ATTR_IDN_CONF_DESC_LOCK = 0x0B,
> + QUERY_ATTR_IDN_MAX_NUM_OF_RTT = 0x0C,
> + QUERY_ATTR_IDN_EE_CONTROL = 0x0D,
> + QUERY_ATTR_IDN_EE_STATUS = 0x0E,
> + QUERY_ATTR_IDN_SECONDS_PASSED = 0x0F,
> + QUERY_ATTR_IDN_CNTX_CONF = 0x10,
> + QUERY_ATTR_IDN_CORR_PRG_BLK_NUM = 0x11,
> +};
> +
> +/* Descriptor idn for Query requests */
> +enum desc_idn {
> + QUERY_DESC_IDN_DEVICE = 0x0,
> + QUERY_DESC_IDN_CONFIGURAION = 0x1,
> + QUERY_DESC_IDN_UNIT = 0x2,
> + QUERY_DESC_IDN_RFU_0 = 0x3,
> + QUERY_DESC_IDN_INTERCONNECT = 0x4,
> + QUERY_DESC_IDN_STRING = 0x5,
> + QUERY_DESC_IDN_RFU_1 = 0x6,
> + QUERY_DESC_IDN_GEOMETRY = 0x7,
> + QUERY_DESC_IDN_POWER = 0x8,
> + QUERY_DESC_IDN_RFU_2 = 0x9,
> + QUERY_DESC_IDN_MAX,
> +};
> +
> +/* UTP QUERY Transaction Specific Fields OpCode */
> +enum query_opcode {
> + UPIU_QUERY_OPCODE_NOP = 0x0,
> + UPIU_QUERY_OPCODE_READ_DESC = 0x1,
> + UPIU_QUERY_OPCODE_WRITE_DESC = 0x2,
> + UPIU_QUERY_OPCODE_READ_ATTR = 0x3,
> + UPIU_QUERY_OPCODE_WRITE_ATTR = 0x4,
> + UPIU_QUERY_OPCODE_READ_FLAG = 0x5,
> + UPIU_QUERY_OPCODE_SET_FLAG = 0x6,
> + UPIU_QUERY_OPCODE_CLEAR_FLAG = 0x7,
> + UPIU_QUERY_OPCODE_TOGGLE_FLAG = 0x8,
> + UPIU_QUERY_OPCODE_MAX,
> +};
> +#endif /* UAPI_UFS_H_ */
> --
> 1.8.5.2
>
> --
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