diff options
Diffstat (limited to 'drivers/scsi/ufs/ufshcd.c')
| -rw-r--r-- | drivers/scsi/ufs/ufshcd.c | 45 |
1 files changed, 44 insertions, 1 deletions
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index f3768ec25c2f..b301ed82ab0a 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -110,6 +110,8 @@ static void ufshcd_tmc_handler(struct ufs_hba *hba); static void ufshcd_async_scan(void *data, async_cookie_t cookie); static int ufshcd_reset_and_restore(struct ufs_hba *hba); static int ufshcd_clear_tm_cmd(struct ufs_hba *hba, int tag); +static int ufshcd_read_sdev_qdepth(struct ufs_hba *hba, + struct scsi_device *sdev); /* * ufshcd_wait_for_register - wait for register value to change @@ -1978,6 +1980,7 @@ static int ufshcd_verify_dev_init(struct ufs_hba *hba) static int ufshcd_slave_alloc(struct scsi_device *sdev) { struct ufs_hba *hba; + int lun_qdepth; hba = shost_priv(sdev->host); sdev->tagged_supported = 1; @@ -1988,6 +1991,14 @@ static int ufshcd_slave_alloc(struct scsi_device *sdev) /* allow SCSI layer to restart the device in case of errors */ sdev->allow_restart = 1; + lun_qdepth = ufshcd_read_sdev_qdepth(hba, sdev); + if (lun_qdepth == 0 || lun_qdepth > hba->nutrs) { + dev_info(hba->dev, "%s, lun %d queue depth is %d\n", __func__, + sdev->lun, lun_qdepth); + lun_qdepth = hba->nutrs; + } else if (lun_qdepth < 0) { + lun_qdepth = 1; + } /* * Inform SCSI Midlayer that the LUN queue depth is same as the @@ -1996,7 +2007,7 @@ static int ufshcd_slave_alloc(struct scsi_device *sdev) * SAM_STAT_TASK_SET_FULL, the LUN queue depth will be adjusted * with scsi_adjust_queue_depth. */ - scsi_activate_tcq(sdev, hba->nutrs); + scsi_activate_tcq(sdev, lun_qdepth); return 0; } @@ -3071,6 +3082,38 @@ static int ufshcd_eh_host_reset_handler(struct scsi_cmnd *cmd) } /** + * ufshcd_read_sdev_qdepth - read the lun command queue depth + * @hba: Pointer to adapter instance + * @sdev: pointer to SCSI device + * + * Return in case of success the lun's queue depth else error. + */ +static int ufshcd_read_sdev_qdepth(struct ufs_hba *hba, + struct scsi_device *sdev) +{ + int ret; + int buff_len = UNIT_DESC_MAX_SIZE; + u8 desc_buf[UNIT_DESC_MAX_SIZE]; + + ret = ufshcd_query_descriptor(hba, UPIU_QUERY_OPCODE_READ_DESC, + QUERY_DESC_IDN_UNIT, sdev->lun, 0, desc_buf, &buff_len); + + if (ret || (buff_len < UNIT_DESC_PARAM_LU_Q_DEPTH)) { + dev_err(hba->dev, + "%s:Failed reading unit descriptor. len = %d ret = %d" + , __func__, buff_len, ret); + if (!ret) + ret = -EINVAL; + + goto out; + } + + ret = desc_buf[UNIT_DESC_PARAM_LU_Q_DEPTH] & 0xFF; +out: + return ret; +} + +/** * ufshcd_async_scan - asynchronous execution for link startup * @data: data pointer to pass to this function * @cookie: cookie data |