On Tue, May 27, 2014 at 12:51 PM, Dolev Raviv <draviv@xxxxxxxxxxxxxx> wrote:
> Introduces the API for sending queries with descriptors.
> A descriptor is a block or page of parameters that describe the device.
> The descriptors are classified into types and can range in size
> from 2 bytes through 255 bytes.
> All descriptors have a length value as their first element, and a type
> identification element as their second byte.
> All descriptors are readable and some may be write once.
> They are accessed using their type, index and selector.
>
> Signed-off-by: Dolev Raviv <draviv@xxxxxxxxxxxxxx>
> Signed-off-by: Raviv Shvili <rshvili@xxxxxxxxxxxxxx>
> ---
> drivers/scsi/ufs/ufs.h | 17 +++++-
> drivers/scsi/ufs/ufshcd.c | 139 +++++++++++++++++++++++++++++++++++++---------
> 2 files changed, 128 insertions(+), 28 deletions(-)
>
> diff --git a/drivers/scsi/ufs/ufs.h b/drivers/scsi/ufs/ufs.h
> index f42d1ce..1545cd7 100644
> --- a/drivers/scsi/ufs/ufs.h
> +++ b/drivers/scsi/ufs/ufs.h
> @@ -41,7 +41,8 @@
>
> #define MAX_CDB_SIZE 16
> #define GENERAL_UPIU_REQUEST_SIZE 32
> -#define QUERY_DESC_MAX_SIZE 256
> +#define QUERY_DESC_MAX_SIZE 255
> +#define QUERY_DESC_MIN_SIZE 2
> #define QUERY_OSF_SIZE (GENERAL_UPIU_REQUEST_SIZE - \
> (sizeof(struct utp_upiu_header)))
>
> @@ -117,6 +118,20 @@ enum attr_idn {
> 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_RFU_2 = 0x9,
> +};
> +
> /* Exception event mask values */
> enum {
> MASK_EE_STATUS = 0xFFFF,
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index 0c28772..ed533f4 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -459,7 +459,7 @@ void ufshcd_copy_query_response(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
>
> /* Get the descriptor */
> if (lrbp->ucd_rsp_ptr->qr.opcode == UPIU_QUERY_OPCODE_READ_DESC) {
> - u8 *descp = (u8 *)&lrbp->ucd_rsp_ptr +
> + u8 *descp = (u8 *)lrbp->ucd_rsp_ptr +
> GENERAL_UPIU_REQUEST_SIZE;
> u16 len;
>
> @@ -1134,6 +1134,30 @@ out_put_tag:
> }
>
> /**
> + * ufshcd_init_query() - init the query response and request parameters
> + * @hba: per-adapter instance
> + * @request: address of the request pointer to be initialized
> + * @response: address of the response pointer to be initialized
> + * @opcode: operation to perform
> + * @idn: flag idn to access
> + * @index: LU number to access
> + * @selector: query/flag/descriptor further identification
> + */
> +static inline void ufshcd_init_query(struct ufs_hba *hba,
> + struct ufs_query_req **request, struct ufs_query_res **response,
> + enum query_opcode opcode, u8 idn, u8 index, u8 selector)
> +{
> + *request = &hba->dev_cmd.query.request;
> + *response = &hba->dev_cmd.query.response;
> + memset(*request, 0, sizeof(struct ufs_query_req));
> + memset(*response, 0, sizeof(struct ufs_query_res));
> + (*request)->upiu_req.opcode = opcode;
> + (*request)->upiu_req.idn = idn;
> + (*request)->upiu_req.index = index;
> + (*request)->upiu_req.selector = selector;
> +}
> +
> +/**
> * ufshcd_query_flag() - API function for sending flag query requests
> * hba: per-adapter instance
> * query_opcode: flag query to perform
> @@ -1145,17 +1169,15 @@ out_put_tag:
> static int ufshcd_query_flag(struct ufs_hba *hba, enum query_opcode opcode,
> enum flag_idn idn, bool *flag_res)
> {
> - struct ufs_query_req *request;
> - struct ufs_query_res *response;
> - int err;
> + struct ufs_query_req *request = NULL;
> + struct ufs_query_res *response = NULL;
> + int err, index = 0, selector = 0;
>
> BUG_ON(!hba);
>
> mutex_lock(&hba->dev_cmd.lock);
> - request = &hba->dev_cmd.query.request;
> - response = &hba->dev_cmd.query.response;
> - memset(request, 0, sizeof(struct ufs_query_req));
> - memset(response, 0, sizeof(struct ufs_query_res));
> + ufshcd_init_query(hba, &request, &response, opcode, idn, index,
> + selector);
>
> switch (opcode) {
> case UPIU_QUERY_OPCODE_SET_FLAG:
> @@ -1180,12 +1202,8 @@ static int ufshcd_query_flag(struct ufs_hba *hba, enum query_opcode opcode,
> err = -EINVAL;
> goto out_unlock;
> }
> - request->upiu_req.opcode = opcode;
> - request->upiu_req.idn = idn;
>
> - /* Send query request */
> - err = ufshcd_exec_dev_cmd(hba, DEV_CMD_TYPE_QUERY,
> - QUERY_REQ_TIMEOUT);
> + err = ufshcd_exec_dev_cmd(hba, DEV_CMD_TYPE_QUERY, QUERY_REQ_TIMEOUT);
>
> if (err) {
> dev_err(hba->dev,
> @@ -1217,8 +1235,8 @@ out_unlock:
> static int ufshcd_query_attr(struct ufs_hba *hba, enum query_opcode opcode,
> enum attr_idn idn, u8 index, u8 selector, u32 *attr_val)
> {
> - struct ufs_query_req *request;
> - struct ufs_query_res *response;
> + struct ufs_query_req *request = NULL;
> + struct ufs_query_res *response = NULL;
> int err;
>
> BUG_ON(!hba);
> @@ -1231,10 +1249,8 @@ static int ufshcd_query_attr(struct ufs_hba *hba, enum query_opcode opcode,
> }
>
> mutex_lock(&hba->dev_cmd.lock);
> - request = &hba->dev_cmd.query.request;
> - response = &hba->dev_cmd.query.response;
> - memset(request, 0, sizeof(struct ufs_query_req));
> - memset(response, 0, sizeof(struct ufs_query_res));
> + ufshcd_init_query(hba, &request, &response, opcode, idn, index,
> + selector);
>
> switch (opcode) {
> case UPIU_QUERY_OPCODE_WRITE_ATTR:
> @@ -1251,14 +1267,7 @@ static int ufshcd_query_attr(struct ufs_hba *hba, enum query_opcode opcode,
> goto out_unlock;
> }
>
> - request->upiu_req.opcode = opcode;
> - request->upiu_req.idn = idn;
> - request->upiu_req.index = index;
> - request->upiu_req.selector = selector;
> -
> - /* Send query request */
> - err = ufshcd_exec_dev_cmd(hba, DEV_CMD_TYPE_QUERY,
> - QUERY_REQ_TIMEOUT);
> + err = ufshcd_exec_dev_cmd(hba, DEV_CMD_TYPE_QUERY, QUERY_REQ_TIMEOUT);
>
> if (err) {
> dev_err(hba->dev, "%s: opcode 0x%.2x for idn %d failed, err = %d\n",
> @@ -1275,6 +1284,82 @@ out:
> }
>
> /**
> + * ufshcd_query_descriptor - API function for sending descriptor requests
> + * hba: per-adapter instance
> + * opcode: attribute opcode
> + * idn: attribute idn to access
> + * index: index field
> + * selector: selector field
> + * desc_buf: the buffer that contains the descriptor
> + * buf_len: length parameter passed to the device
> + *
> + * Returns 0 for success, non-zero in case of failure.
> + * The buf_len parameter will contain, on return, the length parameter
> + * received on the response.
> + */
> +int ufshcd_query_descriptor(struct ufs_hba *hba,
> + enum query_opcode opcode, enum desc_idn idn, u8 index,
> + u8 selector, u8 *desc_buf, int *buf_len)
> +{
> + struct ufs_query_req *request = NULL;
> + struct ufs_query_res *response = NULL;
> + int err;
> +
> + BUG_ON(!hba);
> +
> + if (!desc_buf) {
> + dev_err(hba->dev, "%s: descriptor buffer required for opcode 0x%x\n",
> + __func__, opcode);
> + err = -EINVAL;
> + goto out;
> + }
> +
> + if (*buf_len <= QUERY_DESC_MIN_SIZE || *buf_len > QUERY_DESC_MAX_SIZE) {
> + dev_err(hba->dev, "%s: descriptor buffer size (%d) is out of range\n",
> + __func__, *buf_len);
> + err = -EINVAL;
> + goto out;
> + }
> +
> + mutex_lock(&hba->dev_cmd.lock);
> + ufshcd_init_query(hba, &request, &response, opcode, idn, index,
> + selector);
> + hba->dev_cmd.query.descriptor = desc_buf;
> + request->upiu_req.length = *buf_len;
> +
> + switch (opcode) {
> + case UPIU_QUERY_OPCODE_WRITE_DESC:
> + request->query_func = UPIU_QUERY_FUNC_STANDARD_WRITE_REQUEST;
> + break;
> + case UPIU_QUERY_OPCODE_READ_DESC:
> + request->query_func = UPIU_QUERY_FUNC_STANDARD_READ_REQUEST;
> + break;
> + default:
> + dev_err(hba->dev,
> + "%s: Expected query descriptor opcode but got = 0x%.2x\n",
> + __func__, opcode);
> + err = -EINVAL;
> + goto out_unlock;
> + }
> +
> + err = ufshcd_exec_dev_cmd(hba, DEV_CMD_TYPE_QUERY, QUERY_REQ_TIMEOUT);
> +
> + if (err) {
> + dev_err(hba->dev, "%s: opcode 0x%.2x for idn %d failed, err = %d\n",
> + __func__, opcode, idn, err);
> + goto out_unlock;
> + }
> +
> + hba->dev_cmd.query.descriptor = NULL;
> + *buf_len = response->upiu_res.length;
> +
> +out_unlock:
> + mutex_unlock(&hba->dev_cmd.lock);
> +out:
> + return err;
> +}
> +
> +/**
> * ufshcd_memory_alloc - allocate memory for host memory space data structures
> * @hba: per adapter instance
> *
> --
> 1.8.5.2
>
Acked-by: Santosh Y <santoshsy@xxxxxxxxx>
--
~Santosh
--
To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
