On Fri, Jul 26, 2013 at 7:16 PM, Seungwon Jeon <[email protected]> wrote:
> Except for 'GOOD' and 'CHECK CONDITION', other status value
> in Response UPIU may or may contain sense data. If a non-zero
> value is in the Data Segment Length field, it means that UPIU
> has Sense Data in the Data Segment area.
>
> Signed-off-by: Seungwon Jeon <[email protected]>
> ---
> drivers/scsi/ufs/ufs.h | 1 +
> drivers/scsi/ufs/ufshcd.c | 27 +++++++++++++++++++--------
> 2 files changed, 20 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/scsi/ufs/ufs.h b/drivers/scsi/ufs/ufs.h
> index 139bc06..737c31b 100644
> --- a/drivers/scsi/ufs/ufs.h
> +++ b/drivers/scsi/ufs/ufs.h
> @@ -114,6 +114,7 @@ enum {
> MASK_SCSI_STATUS = 0xFF,
> MASK_TASK_RESPONSE = 0xFF00,
> MASK_RSP_UPIU_RESULT = 0xFFFF,
> + MASK_RSP_UPIU_DATA_SEG_LEN = 0xFFFF,
> };
>
> /* Task management service response */
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index 4cf3a2d..688ae0e 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -218,6 +218,20 @@ ufshcd_get_rsp_upiu_result(struct utp_upiu_rsp
> *ucd_rsp_ptr)
> return be32_to_cpu(ucd_rsp_ptr->header.dword_1) &
> MASK_RSP_UPIU_RESULT;
> }
>
> +/*
> + * ufshcd_get_rsp_upiu_data_seg_len - Get the data segment length
> + * from response UPIU
> + * @ucd_rsp_ptr: pointer to response UPIU
> + *
> + * Return the data segment length.
> + */
> +static inline int
> +ufshcd_get_rsp_upiu_data_seg_len(struct utp_upiu_rsp *ucd_rsp_ptr)
> +{
> + return be32_to_cpu(ucd_rsp_ptr->header.dword_2) &
> + MASK_RSP_UPIU_DATA_SEG_LEN;
> +}
> +
> /**
> * ufshcd_config_int_aggr - Configure interrupt aggregation values.
> * Currently there is no use case where we want to configure
> @@ -298,7 +312,8 @@ void ufshcd_send_command(struct ufs_hba *hba, unsigned
> int task_tag)
> static inline void ufshcd_copy_sense_data(struct ufshcd_lrb *lrbp)
> {
> int len;
> - if (lrbp->sense_buffer) {
> + if (lrbp->sense_buffer &&
> + !ufshcd_get_rsp_upiu_data_seg_len(lrbp->ucd_rsp_ptr)) {
> len = be16_to_cpu(lrbp->ucd_rsp_ptr->sense_data_len);
> memcpy(lrbp->sense_buffer,
> lrbp->ucd_rsp_ptr->sense_data,
Also please change the SCSI_SENSE_BUFFERSIZE to 18-bytes as per the
spec, *in case* if wrong 'data segment length' is returned, there
won't be a need to memcpy extra bytes ;-).
#define UFS_SENSE_BUFFERSIZE 18
memcpy(lrbp->sense_buffer,
lrbp->ucd_rsp_ptr->sense_data,
min_t(int, len, UFS_SENSE_BUFFERSIZE));
> @@ -1156,21 +1171,17 @@ ufshcd_scsi_cmd_status(struct ufshcd_lrb *lrbp, int
> scsi_status)
> SAM_STAT_CHECK_CONDITION;
> ufshcd_copy_sense_data(lrbp);
> break;
> - case SAM_STAT_BUSY:
> - result |= SAM_STAT_BUSY;
> - break;
> case SAM_STAT_TASK_SET_FULL:
> -
> /*
> * If a LUN reports SAM_STAT_TASK_SET_FULL, then the LUN queue
> * depth needs to be adjusted to the exact number of
> * outstanding commands the LUN can handle at any given time.
> */
> ufshcd_adjust_lun_qdepth(lrbp->cmd);
> - result |= SAM_STAT_TASK_SET_FULL;
> - break;
> + case SAM_STAT_BUSY:
> case SAM_STAT_TASK_ABORTED:
> - result |= SAM_STAT_TASK_ABORTED;
> + result |= scsi_status;
> + ufshcd_copy_sense_data(lrbp);
> break;
> default:
> result |= DID_ERROR << 16;
> --
> 1.7.0.4
>
>
--
~Santosh
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