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scsi: ufs-qti: Enable block layer runtime PM for well-known logical units

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Block layer RPM is enabled for the genernal UFS SCSI devices when they are
probed by their driver. However block layer RPM is not enabled for UFS
well-known SCSI devices.

As UFS SCSI devices have their corresponding BSG char devices, accessing
a BSG char device via IOCTL may send requests to its corresponding SCSI
device through its request queue. If BSG IOCTL sends a request to a
well-known SCSI device when hba is not runtime active, due to block layer
RPM is not eanbled for the well-known SCSI devices, hba, which is at the
top of a scsi device's parent chain, shall not be resumed, then unexpected
error would happen.

This change enables block layer RPM for the well-known SCSI devices, so
that block layer can handle RPM for the well-known SCSI devices just like
for the general SCSI devices.

Change-Id: Ie4c5c4876f8500c285166a5f7be87a2157a12df3
Signed-off-by: Can Guo <cang@codeaurora.org>
This commit is contained in:
Can Guo 2020-03-24 19:33:29 -07:00
commit bb45ad80bd
1 changed files with 17 additions and 2 deletions
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19
drivers/scsi/ufs/ufshcd-qti.c
View file

@ -8,6 +8,7 @@
#include <linux/of.h>
#include <linux/bitfield.h>
#include <linux/blkdev.h>
#include <linux/blk-pm.h>
#include <linux/suspend.h>
#include <linux/devfreq.h>
#include <linux/pinctrl/consumer.h>
@ -7686,6 +7687,16 @@ static int ufshcd_set_low_vcc_level(struct ufs_hba *hba,
return ret;
}
static inline void ufshcd_blk_pm_runtime_init(struct scsi_device *sdev)
{
scsi_autopm_get_device(sdev);
blk_pm_runtime_init(sdev->request_queue, &sdev->sdev_gendev);
if (sdev->rpm_autosuspend)
pm_runtime_set_autosuspend_delay(&sdev->sdev_gendev,
UFSHCD_AUTO_SUSPEND_DELAY_MS);
scsi_autopm_put_device(sdev);
}
/**
* ufshcd_scsi_add_wlus - Adds required W-LUs
* @hba: per-adapter instance
@ -7725,6 +7736,7 @@ static int ufshcd_scsi_add_wlus(struct ufs_hba *hba)
hba->sdev_ufs_device = NULL;
goto out;
}
ufshcd_blk_pm_runtime_init(hba->sdev_ufs_device);
scsi_device_put(hba->sdev_ufs_device);
sdev_rpmb = __scsi_add_device(hba->host, 0, 0,
@ -7733,14 +7745,17 @@ static int ufshcd_scsi_add_wlus(struct ufs_hba *hba)
ret = PTR_ERR(sdev_rpmb);
goto remove_sdev_ufs_device;
}
ufshcd_blk_pm_runtime_init(sdev_rpmb);
scsi_device_put(sdev_rpmb);
sdev_boot = __scsi_add_device(hba->host, 0, 0,
ufshcd_upiu_wlun_to_scsi_wlun(UFS_UPIU_BOOT_WLUN), NULL);
if (IS_ERR(sdev_boot))
if (IS_ERR(sdev_boot)) {
dev_err(hba->dev, "%s: BOOT WLUN not found\n", __func__);
else
} else {
ufshcd_blk_pm_runtime_init(sdev_boot);
scsi_device_put(sdev_boot);
}
goto out;
remove_sdev_ufs_device: