From: Bean Huo <[email protected]>
Combine ufshcd_get_lu_power_on_wp_status() and ufshcd_set_queue_depth()
into one single ufshcd_lu_init(), so that we only need to read the LUN
descriptor once.
Signed-off-by: Bean Huo <[email protected]>
---
drivers/ufs/core/ufshcd.c | 150 ++++++++++++++------------------------
1 file changed, 53 insertions(+), 97 deletions(-)
diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index 8cdba9a54870..8599780022fb 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -4859,100 +4859,6 @@ static int ufshcd_verify_dev_init(struct ufs_hba *hba)
return err;
}
-/**
- * ufshcd_set_queue_depth - set lun queue depth
- * @sdev: pointer to SCSI device
- *
- * Read bLUQueueDepth value and activate scsi tagged command
- * queueing. For WLUN, queue depth is set to 1. For best-effort
- * cases (bLUQueueDepth = 0) the queue depth is set to a maximum
- * value that host can queue.
- */
-static void ufshcd_set_queue_depth(struct scsi_device *sdev)
-{
- int ret = 0;
- u8 lun_qdepth;
- struct ufs_hba *hba;
-
- hba = shost_priv(sdev->host);
-
- lun_qdepth = hba->nutrs;
- ret = ufshcd_read_unit_desc_param(hba,
- ufshcd_scsi_to_upiu_lun(sdev->lun),
- UNIT_DESC_PARAM_LU_Q_DEPTH,
- &lun_qdepth,
- sizeof(lun_qdepth));
-
- /* Some WLUN doesn't support unit descriptor */
- if (ret == -EOPNOTSUPP)
- lun_qdepth = 1;
- else if (!lun_qdepth)
- /* eventually, we can figure out the real queue depth */
- lun_qdepth = hba->nutrs;
- else
- lun_qdepth = min_t(int, lun_qdepth, hba->nutrs);
-
- dev_dbg(hba->dev, "%s: activate tcq with queue depth %d\n",
- __func__, lun_qdepth);
- scsi_change_queue_depth(sdev, lun_qdepth);
-}
-
-/*
- * ufshcd_get_lu_wp - returns the "b_lu_write_protect" from UNIT DESCRIPTOR
- * @hba: per-adapter instance
- * @lun: UFS device lun id
- * @b_lu_write_protect: pointer to buffer to hold the LU's write protect info
- *
- * Returns 0 in case of success and b_lu_write_protect status would be returned
- * @b_lu_write_protect parameter.
- * Returns -ENOTSUPP if reading b_lu_write_protect is not supported.
- * Returns -EINVAL in case of invalid parameters passed to this function.
- */
-static int ufshcd_get_lu_wp(struct ufs_hba *hba,
- u8 lun,
- u8 *b_lu_write_protect)
-{
- int ret;
-
- if (!b_lu_write_protect)
- ret = -EINVAL;
- /*
- * According to UFS device spec, RPMB LU can't be write
- * protected so skip reading bLUWriteProtect parameter for
- * it. For other W-LUs, UNIT DESCRIPTOR is not available.
- */
- else if (lun >= hba->dev_info.max_lu_supported)
- ret = -ENOTSUPP;
- else
- ret = ufshcd_read_unit_desc_param(hba,
- lun,
- UNIT_DESC_PARAM_LU_WR_PROTECT,
- b_lu_write_protect,
- sizeof(*b_lu_write_protect));
- return ret;
-}
-
-/**
- * ufshcd_get_lu_power_on_wp_status - get LU's power on write protect
- * status
- * @hba: per-adapter instance
- * @sdev: pointer to SCSI device
- *
- */
-static inline void ufshcd_get_lu_power_on_wp_status(struct ufs_hba *hba,
- const struct scsi_device *sdev)
-{
- if (hba->dev_info.f_power_on_wp_en &&
- !hba->dev_info.is_lu_power_on_wp) {
- u8 b_lu_write_protect;
-
- if (!ufshcd_get_lu_wp(hba, ufshcd_scsi_to_upiu_lun(sdev->lun),
- &b_lu_write_protect) &&
- (b_lu_write_protect == UFS_LU_POWER_ON_WP))
- hba->dev_info.is_lu_power_on_wp = true;
- }
-}
-
/**
* ufshcd_setup_links - associate link b/w device wlun and other luns
* @sdev: pointer to SCSI device
@@ -4990,6 +4896,58 @@ static void ufshcd_setup_links(struct ufs_hba *hba, struct scsi_device *sdev)
}
}
+/**
+ * ufshcd_lu_init - Initialize the relevant parameters of the LU
+ * @hba: per-adapter instance
+ * @sdev: pointer to SCSI device
+ */
+static void ufshcd_lu_init(struct ufs_hba *hba, struct scsi_device *sdev)
+{
+ int len = hba->desc_size[QUERY_DESC_IDN_UNIT];
+ u8 lun = ufshcd_scsi_to_upiu_lun(sdev->lun);
+ u8 lun_qdepth = hba->nutrs;
+ u8 *desc_buf;
+ int ret;
+
+ desc_buf = kzalloc(len, GFP_KERNEL);
+ if (!desc_buf)
+ goto set_qdepth;
+
+ ret = ufshcd_read_unit_desc_param(hba, lun, 0, desc_buf, len);
+ if (ret < 0) {
+ if (ret == -EOPNOTSUPP)
+ /* If LU doesn't support unit descriptor, its queue depth is set to 1 */
+ lun_qdepth = 1;
+ kfree(desc_buf);
+ goto set_qdepth;
+ }
+
+ if (desc_buf[UNIT_DESC_PARAM_LU_Q_DEPTH]) {
+ /*
+ * In per-LU queueing architecture, bLUQueueDepth will not be 0, then we will
+ * use the smaller between UFSHCI CAP.NUTRS and UFS LU bLUQueueDepth
+ */
+ lun_qdepth = min_t(int, desc_buf[UNIT_DESC_PARAM_LU_Q_DEPTH], hba->nutrs);
+ }
+ /*
+ * According to UFS device specification, the write protection mode is only supported by
+ * normal LU, not supported by WLUN.
+ */
+ if (hba->dev_info.f_power_on_wp_en && lun < hba->dev_info.max_lu_supported &&
+ !hba->dev_info.is_lu_power_on_wp &&
+ desc_buf[UNIT_DESC_PARAM_LU_WR_PROTECT] == UFS_LU_POWER_ON_WP)
+ hba->dev_info.is_lu_power_on_wp = true;
+
+ kfree(desc_buf);
+set_qdepth:
+ /*
+ * For WLUNs that don't support unit descriptor, queue depth is set to 1. For LUs whose
+ * bLUQueueDepth == 0, the queue depth is set to a maximum value that host can queue.
+ */
+ dev_dbg(hba->dev, "Set LU %x queue depth %d\n", lun, lun_qdepth);
+ scsi_change_queue_depth(sdev, lun_qdepth);
+}
+
/**
* ufshcd_slave_alloc - handle initial SCSI device configurations
* @sdev: pointer to SCSI device
@@ -5017,9 +4975,7 @@ static int ufshcd_slave_alloc(struct scsi_device *sdev)
/* WRITE_SAME command is not supported */
sdev->no_write_same = 1;
- ufshcd_set_queue_depth(sdev);
-
- ufshcd_get_lu_power_on_wp_status(hba, sdev);
+ ufshcd_lu_init(hba, sdev);
ufshcd_setup_links(hba, sdev);
--
2.34.1
> -----Original Message-----
> From: Bean Huo <[email protected]>
> Sent: Sunday, October 23, 2022 12:37 AM
> To: [email protected]; Avri Altman <[email protected]>;
> [email protected]; [email protected];
> [email protected]; [email protected];
> [email protected]; [email protected]; [email protected];
> [email protected]; [email protected]
> Cc: [email protected]; [email protected]
> Subject: [PATCH v4 2/3] scsi: ufs: core: Cleanup ufshcd_slave_alloc()
>
> CAUTION: This email originated from outside of Western Digital. Do not click
> on links or open attachments unless you recognize the sender and know that
> the content is safe.
>
>
> From: Bean Huo <[email protected]>
>
> Combine ufshcd_get_lu_power_on_wp_status() and
> ufshcd_set_queue_depth()
> into one single ufshcd_lu_init(), so that we only need to read the LUN
> descriptor once.
>
> Signed-off-by: Bean Huo <[email protected]>
Reviewed-by: Arthur Simchaev <[email protected]>
On 10/22/22 14:36, Bean Huo wrote:
> + u8 lun_qdepth = hba->nutrs;
How about changing this into hba->nutrs - 1 since one tag is reserved
('reserved_slot')?
Thanks,
Bart.
On Mon, 2022-10-24 at 16:25 -0700, Bart Van Assche wrote:
> On 10/22/22 14:36, Bean Huo wrote:
> > + u8 lun_qdepth = hba->nutrs;
>
> How about changing this into hba->nutrs - 1 since one tag is reserved
> ('reserved_slot')?
>
> Thanks,
Bart,
If having a look at
scsi_change_queue_depth() {
depth = min_t(int, depth, scsi_device_max_queue_depth(sdev));
...
}
so the finnal depth per Lu is still 31. I did test and debug, this is
true.
+set_qdepth:
+ /*
+ * For WLUNs that don't support unit descriptor, queue depth
is set to 1. For LUs whose
+ * bLUQueueDepth == 0, the queue depth is set to a maximum
value that host can queue.
+ */
+ dev_dbg(hba->dev, "Set LU %x queue depth %d\n", lun,
lun_qdepth);
+ scsi_change_queue_depth(sdev, lun_qdepth);
so lun_qdepth is 32, but scsi_change_queue_depth() will return 31,
since we set sdev->host->can_queue is 31.
If you need me to change the patch, let me know, it is no problem for
me to change to:
u8 lun_qdepth = hba->nutrs - UFSHCD_NUM_RESERVED.
or
u8 lun_qdepth = UFSHCD_CMD_PER_LUN.
Kind regards,
Bean
On 10/25/22 04:44, Bean Huo wrote:
> On Mon, 2022-10-24 at 16:25 -0700, Bart Van Assche wrote:
> If having a look at
>
> scsi_change_queue_depth() {
>
> depth = min_t(int, depth, scsi_device_max_queue_depth(sdev));
> ...
> }
>
> so the final depth per Lu is still 31. I did test and debug, this is
> true.
Hi Bean,
Thanks for the clarification. I will add my Reviewed-by to this patch.
Bart.
On 10/22/22 14:36, Bean Huo wrote:
> Combine ufshcd_get_lu_power_on_wp_status() and ufshcd_set_queue_depth()
> into one single ufshcd_lu_init(), so that we only need to read the LUN
> descriptor once.
Reviewed-by: Bart Van Assche <[email protected]>