* [PATCH v18 0/2] Enable power management for ufs wlun
@ 2021-04-14 18:58 Asutosh Das
2021-04-14 18:58 ` [PATCH v18 1/2] scsi: ufs: Enable power management for wlun Asutosh Das
2021-04-14 18:58 ` [PATCH v18 2/2] ufs: sysfs: Resume the proper scsi device Asutosh Das
0 siblings, 2 replies; 10+ messages in thread
From: Asutosh Das @ 2021-04-14 18:58 UTC (permalink / raw)
To: cang, martin.petersen, adrian.hunter, linux-scsi
Cc: Asutosh Das, linux-arm-msm, Matthias Brugger,
moderated list:ARM/Mediatek SoC support,
moderated list:ARM/Mediatek SoC support
This patch attempts to fix a deadlock in ufs while sending SSU.
Recently, blk_queue_enter() added a check to not process requests if the
queue is suspended. That leads to a resume of the associated device which
is suspended. In ufs, that device is ufs device wlun and it's parent is
ufs_hba. This resume tries to resume ufs device wlun which in turn tries
to resume ufs_hba, which is already in the process of suspending, thus
causing a deadlock.
This patch takes care of:
* Suspending the ufs device lun only after all other luns are suspended
* Sending SSU during ufs device wlun suspend
* Clearing uac for rpmb and ufs device wlun
* Not sending commands to the device during host suspend
v17 -> v18:
- Addressed Adrian's comments
v16 -> v17:
- Addressed Adrian's & Daejun's comments
v15 -> v16:
- Brought back the missing changes
* Added scsi_autopm_[get/put] to ufs_debugfs[get/put]_user_access()
* Fix ufshcd_wl_poweroff()
v14 -> v15:
- Rebased on 5.13/scsi-staging
v13 -> v14:
- Addressed Adrian's comments
* Rebased it on top of scsi-next
* Added scsi_autopm_[get/put] to ufs_debugfs[get/put]_user_access()
* Resume the device in ufshcd_remove()
* Unregister ufs_rpmb_wlun before ufs_dev_wlun
* hba->shutting_down moved to ufshcd_wl_shutdown()
v12 -> v13:
- Addressed Adrian's comments
* Paired pm_runtime_get_noresume() with pm_runtime_put()
* no rpm_autosuspend for ufs device wlun
* Moved runtime-pm init functionality to ufshcd_wl_probe()
- Addressed Bart's comments
* Expanded abbrevs in commit message
v11 -> v12:
- Addressed Adrian's comments
* Fixed ahit for Mediatek driver
* Fixed error handling in ufshcd_core_init()
* Tested this patch and the issue is still seen.
v10 -> v11:
- Fixed supplier suspending before consumer race
- Addressed Adrian's comments
* Added proper resume/suspend cb to ufshcd_auto_hibern8_update()
* Cosmetic changes to ufshcd-pci.c
* Cleaned up ufshcd_system_suspend()
* Added ufshcd_debugfs_eh_exit to ufshcd_core_init()
v9 -> v10:
- Addressed Adrian's comments
* Moved suspend/resume vops to __ufshcd_wl_[suspend/resume]()
* Added correct resume in ufs_bsg
v8 -> v9:
- Addressed Adrian's comments
* Moved link transition to __ufshcd_wl_[suspend/resume]()
* Fixed the other minor comments
v7 -> v8:
- Addressed Adrian's comments
* Removed separate autosuspend delay for ufs-device lun
* Fixed the ee handler getting scheduled during pm
* Always runtime resume in suspend_prepare()
* Added CONFIG_PM_SLEEP where needed
v6 -> v7:
* Resume the ufs device before shutting it down
v5 -> v6:
- Addressed Adrian's comments
* Added complete() cb
* Added suspend_prepare() and complete() to all drivers
* Moved suspend_prepare() and complete() to ufshcd
* .poweroff() uses ufhcd_wl_poweroff()
* Removed several forward declarations
* Moved scsi_register_driver() to ufshcd_core_init()
v4 -> v5:
- Addressed Adrian's comments
* Used the rpmb driver contributed by Adrian
* Runtime-resume the ufs device during suspend to honor spm-lvl
* Unregister the scsi_driver in ufshcd_remove()
* Currently shutdown() puts the ufs device to power-down mode
so, just removed ufshcd_pci_poweroff()
* Quiesce the scsi device during shutdown instead of remove
v3 RFC -> v4:
- Addressed Bart's comments
* Except that I didn't get any checkpatch failures
- Addressed Avri's comments
- Addressed Adrian's comments
* Added a check for deepsleep power mode
* Removed a couple of forward declarations
* Didn't separate the scsi drivers because in rpmb case it just sends uac
in resume and it seemed pretty neat to me.
- Added sysfs changes to resume the devices before accessing
Asutosh Das (2):
scsi: ufs: Enable power management for wlun
ufs: sysfs: Resume the proper scsi device
drivers/scsi/ufs/cdns-pltfrm.c | 2 +
drivers/scsi/ufs/tc-dwc-g210-pci.c | 2 +
drivers/scsi/ufs/ufs-debugfs.c | 6 +-
drivers/scsi/ufs/ufs-debugfs.h | 2 +-
drivers/scsi/ufs/ufs-exynos.c | 2 +
drivers/scsi/ufs/ufs-hisi.c | 2 +
drivers/scsi/ufs/ufs-mediatek.c | 12 +-
drivers/scsi/ufs/ufs-qcom.c | 2 +
drivers/scsi/ufs/ufs-sysfs.c | 24 +-
drivers/scsi/ufs/ufs_bsg.c | 6 +-
drivers/scsi/ufs/ufshcd-pci.c | 36 +-
drivers/scsi/ufs/ufshcd.c | 692 +++++++++++++++++++++++++------------
drivers/scsi/ufs/ufshcd.h | 21 ++
include/trace/events/ufs.h | 20 ++
14 files changed, 561 insertions(+), 268 deletions(-)
--
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.
^ permalink raw reply [flat|nested] 10+ messages in thread
* [PATCH v18 1/2] scsi: ufs: Enable power management for wlun
2021-04-14 18:58 [PATCH v18 0/2] Enable power management for ufs wlun Asutosh Das
@ 2021-04-14 18:58 ` Asutosh Das
2021-04-14 22:41 ` kernel test robot
` (3 more replies)
2021-04-14 18:58 ` [PATCH v18 2/2] ufs: sysfs: Resume the proper scsi device Asutosh Das
1 sibling, 4 replies; 10+ messages in thread
From: Asutosh Das @ 2021-04-14 18:58 UTC (permalink / raw)
To: cang, martin.petersen, adrian.hunter, linux-scsi
Cc: Asutosh Das, linux-arm-msm, Alim Akhtar, Avri Altman,
James E.J. Bottomley, Pedro Sousa, Krzysztof Kozlowski,
Stanley Chu, Andy Gross, Bjorn Andersson, Steven Rostedt,
Ingo Molnar, Matthias Brugger, Lee Jones, Bean Huo, Kiwoong Kim,
Yue Hu, Wei Yongjun, Gustavo A. R. Silva, Dinghao Liu,
Jaegeuk Kim, Satya Tangirala, open list,
moderated list:ARM/SAMSUNG S3C, S5P AND EXYNOS ARM ARCHITECTURES,
open list:ARM/SAMSUNG S3C, S5P AND EXYNOS ARM ARCHITECTURES,
moderated list:UNIVERSAL FLASH STORAGE HOST CONTROLLER DRIVER...
During runtime-suspend of ufs host, the scsi devices are
already suspended and so are the queues associated with them.
But the ufs host sends SSU (START_STOP_UNIT) to wlun
during its runtime-suspend.
During the process blk_queue_enter checks if the queue is not in
suspended state. If so, it waits for the queue to resume, and never
comes out of it.
The commit
(d55d15a33: scsi: block: Do not accept any requests while suspended)
adds the check if the queue is in suspended state in blk_queue_enter().
Call trace:
__switch_to+0x174/0x2c4
__schedule+0x478/0x764
schedule+0x9c/0xe0
blk_queue_enter+0x158/0x228
blk_mq_alloc_request+0x40/0xa4
blk_get_request+0x2c/0x70
__scsi_execute+0x60/0x1c4
ufshcd_set_dev_pwr_mode+0x124/0x1e4
ufshcd_suspend+0x208/0x83c
ufshcd_runtime_suspend+0x40/0x154
ufshcd_pltfrm_runtime_suspend+0x14/0x20
pm_generic_runtime_suspend+0x28/0x3c
__rpm_callback+0x80/0x2a4
rpm_suspend+0x308/0x614
rpm_idle+0x158/0x228
pm_runtime_work+0x84/0xac
process_one_work+0x1f0/0x470
worker_thread+0x26c/0x4c8
kthread+0x13c/0x320
ret_from_fork+0x10/0x18
Fix this by registering ufs device wlun as a scsi driver and
registering it for block runtime-pm. Also make this as a
supplier for all other luns. That way, this device wlun
suspends after all the consumers and resumes after
hba resumes.
Co-developed-by: Can Guo <cang@codeaurora.org>
Signed-off-by: Can Guo <cang@codeaurora.org>
Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
---
drivers/scsi/ufs/cdns-pltfrm.c | 2 +
drivers/scsi/ufs/tc-dwc-g210-pci.c | 2 +
drivers/scsi/ufs/ufs-debugfs.c | 6 +-
drivers/scsi/ufs/ufs-debugfs.h | 2 +-
drivers/scsi/ufs/ufs-exynos.c | 2 +
drivers/scsi/ufs/ufs-hisi.c | 2 +
drivers/scsi/ufs/ufs-mediatek.c | 12 +-
drivers/scsi/ufs/ufs-qcom.c | 2 +
drivers/scsi/ufs/ufs_bsg.c | 6 +-
drivers/scsi/ufs/ufshcd-pci.c | 36 +-
drivers/scsi/ufs/ufshcd.c | 692 +++++++++++++++++++++++++------------
drivers/scsi/ufs/ufshcd.h | 21 ++
include/trace/events/ufs.h | 20 ++
13 files changed, 549 insertions(+), 256 deletions(-)
diff --git a/drivers/scsi/ufs/cdns-pltfrm.c b/drivers/scsi/ufs/cdns-pltfrm.c
index 13d9204..b9105e4 100644
--- a/drivers/scsi/ufs/cdns-pltfrm.c
+++ b/drivers/scsi/ufs/cdns-pltfrm.c
@@ -323,6 +323,8 @@ static const struct dev_pm_ops cdns_ufs_dev_pm_ops = {
.runtime_suspend = ufshcd_pltfrm_runtime_suspend,
.runtime_resume = ufshcd_pltfrm_runtime_resume,
.runtime_idle = ufshcd_pltfrm_runtime_idle,
+ .prepare = ufshcd_suspend_prepare,
+ .complete = ufshcd_resume_complete,
};
static struct platform_driver cdns_ufs_pltfrm_driver = {
diff --git a/drivers/scsi/ufs/tc-dwc-g210-pci.c b/drivers/scsi/ufs/tc-dwc-g210-pci.c
index 67a6a61..b01db12 100644
--- a/drivers/scsi/ufs/tc-dwc-g210-pci.c
+++ b/drivers/scsi/ufs/tc-dwc-g210-pci.c
@@ -148,6 +148,8 @@ static const struct dev_pm_ops tc_dwc_g210_pci_pm_ops = {
.runtime_suspend = tc_dwc_g210_pci_runtime_suspend,
.runtime_resume = tc_dwc_g210_pci_runtime_resume,
.runtime_idle = tc_dwc_g210_pci_runtime_idle,
+ .prepare = ufshcd_suspend_prepare,
+ .complete = ufshcd_resume_complete,
};
static const struct pci_device_id tc_dwc_g210_pci_tbl[] = {
diff --git a/drivers/scsi/ufs/ufs-debugfs.c b/drivers/scsi/ufs/ufs-debugfs.c
index ced9ef4..4e1ff20 100644
--- a/drivers/scsi/ufs/ufs-debugfs.c
+++ b/drivers/scsi/ufs/ufs-debugfs.c
@@ -13,7 +13,7 @@ void __init ufs_debugfs_init(void)
ufs_debugfs_root = debugfs_create_dir("ufshcd", NULL);
}
-void __exit ufs_debugfs_exit(void)
+void ufs_debugfs_exit(void)
{
debugfs_remove_recursive(ufs_debugfs_root);
}
@@ -60,14 +60,14 @@ __acquires(&hba->host_sem)
up(&hba->host_sem);
return -EBUSY;
}
- pm_runtime_get_sync(hba->dev);
+ ufshcd_rpm_get_sync(hba);
return 0;
}
static void ufs_debugfs_put_user_access(struct ufs_hba *hba)
__releases(&hba->host_sem)
{
- pm_runtime_put_sync(hba->dev);
+ ufshcd_rpm_put_sync(hba);
up(&hba->host_sem);
}
diff --git a/drivers/scsi/ufs/ufs-debugfs.h b/drivers/scsi/ufs/ufs-debugfs.h
index 3ca29d3..97548a3 100644
--- a/drivers/scsi/ufs/ufs-debugfs.h
+++ b/drivers/scsi/ufs/ufs-debugfs.h
@@ -9,7 +9,7 @@ struct ufs_hba;
#ifdef CONFIG_DEBUG_FS
void __init ufs_debugfs_init(void);
-void __exit ufs_debugfs_exit(void);
+void ufs_debugfs_exit(void);
void ufs_debugfs_hba_init(struct ufs_hba *hba);
void ufs_debugfs_hba_exit(struct ufs_hba *hba);
void ufs_debugfs_exception_event(struct ufs_hba *hba, u16 status);
diff --git a/drivers/scsi/ufs/ufs-exynos.c b/drivers/scsi/ufs/ufs-exynos.c
index 70647ea..49a918c 100644
--- a/drivers/scsi/ufs/ufs-exynos.c
+++ b/drivers/scsi/ufs/ufs-exynos.c
@@ -1267,6 +1267,8 @@ static const struct dev_pm_ops exynos_ufs_pm_ops = {
.runtime_suspend = ufshcd_pltfrm_runtime_suspend,
.runtime_resume = ufshcd_pltfrm_runtime_resume,
.runtime_idle = ufshcd_pltfrm_runtime_idle,
+ .prepare = ufshcd_suspend_prepare,
+ .complete = ufshcd_resume_complete,
};
static struct platform_driver exynos_ufs_pltform = {
diff --git a/drivers/scsi/ufs/ufs-hisi.c b/drivers/scsi/ufs/ufs-hisi.c
index 0aa5813..d463b44 100644
--- a/drivers/scsi/ufs/ufs-hisi.c
+++ b/drivers/scsi/ufs/ufs-hisi.c
@@ -574,6 +574,8 @@ static const struct dev_pm_ops ufs_hisi_pm_ops = {
.runtime_suspend = ufshcd_pltfrm_runtime_suspend,
.runtime_resume = ufshcd_pltfrm_runtime_resume,
.runtime_idle = ufshcd_pltfrm_runtime_idle,
+ .prepare = ufshcd_suspend_prepare,
+ .complete = ufshcd_resume_complete,
};
static struct platform_driver ufs_hisi_pltform = {
diff --git a/drivers/scsi/ufs/ufs-mediatek.c b/drivers/scsi/ufs/ufs-mediatek.c
index a981f26..4862a7b 100644
--- a/drivers/scsi/ufs/ufs-mediatek.c
+++ b/drivers/scsi/ufs/ufs-mediatek.c
@@ -810,12 +810,10 @@ static int ufs_mtk_post_link(struct ufs_hba *hba)
/* enable unipro clock gating feature */
ufs_mtk_cfg_unipro_cg(hba, true);
- /* configure auto-hibern8 timer to 10ms */
- if (ufshcd_is_auto_hibern8_supported(hba)) {
- ufshcd_auto_hibern8_update(hba,
- FIELD_PREP(UFSHCI_AHIBERN8_TIMER_MASK, 10) |
- FIELD_PREP(UFSHCI_AHIBERN8_SCALE_MASK, 3));
- }
+ /* will be configured during probe hba */
+ if (ufshcd_is_auto_hibern8_supported(hba))
+ hba->ahit = FIELD_PREP(UFSHCI_AHIBERN8_TIMER_MASK, 10) |
+ FIELD_PREP(UFSHCI_AHIBERN8_SCALE_MASK, 3);
ufs_mtk_setup_clk_gating(hba);
@@ -1097,6 +1095,8 @@ static const struct dev_pm_ops ufs_mtk_pm_ops = {
.runtime_suspend = ufshcd_pltfrm_runtime_suspend,
.runtime_resume = ufshcd_pltfrm_runtime_resume,
.runtime_idle = ufshcd_pltfrm_runtime_idle,
+ .prepare = ufshcd_suspend_prepare,
+ .complete = ufshcd_resume_complete,
};
static struct platform_driver ufs_mtk_pltform = {
diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c
index 9b711d6..6651b87 100644
--- a/drivers/scsi/ufs/ufs-qcom.c
+++ b/drivers/scsi/ufs/ufs-qcom.c
@@ -1556,6 +1556,8 @@ static const struct dev_pm_ops ufs_qcom_pm_ops = {
.runtime_suspend = ufshcd_pltfrm_runtime_suspend,
.runtime_resume = ufshcd_pltfrm_runtime_resume,
.runtime_idle = ufshcd_pltfrm_runtime_idle,
+ .prepare = ufshcd_suspend_prepare,
+ .complete = ufshcd_resume_complete,
};
static struct platform_driver ufs_qcom_pltform = {
diff --git a/drivers/scsi/ufs/ufs_bsg.c b/drivers/scsi/ufs/ufs_bsg.c
index 5b2bc1a..39bf204 100644
--- a/drivers/scsi/ufs/ufs_bsg.c
+++ b/drivers/scsi/ufs/ufs_bsg.c
@@ -97,7 +97,7 @@ static int ufs_bsg_request(struct bsg_job *job)
bsg_reply->reply_payload_rcv_len = 0;
- pm_runtime_get_sync(hba->dev);
+ ufshcd_rpm_get_sync(hba);
msgcode = bsg_request->msgcode;
switch (msgcode) {
@@ -106,7 +106,7 @@ static int ufs_bsg_request(struct bsg_job *job)
ret = ufs_bsg_alloc_desc_buffer(hba, job, &desc_buff,
&desc_len, desc_op);
if (ret) {
- pm_runtime_put_sync(hba->dev);
+ ufshcd_rpm_put_sync(hba);
goto out;
}
@@ -138,7 +138,7 @@ static int ufs_bsg_request(struct bsg_job *job)
break;
}
- pm_runtime_put_sync(hba->dev);
+ ufshcd_rpm_put_sync(hba);
if (!desc_buff)
goto out;
diff --git a/drivers/scsi/ufs/ufshcd-pci.c b/drivers/scsi/ufs/ufshcd-pci.c
index 23ee828..e6c334b 100644
--- a/drivers/scsi/ufs/ufshcd-pci.c
+++ b/drivers/scsi/ufs/ufshcd-pci.c
@@ -410,29 +410,6 @@ static int ufshcd_pci_resume(struct device *dev)
return ufshcd_system_resume(dev_get_drvdata(dev));
}
-/**
- * ufshcd_pci_poweroff - suspend-to-disk poweroff function
- * @dev: pointer to PCI device handle
- *
- * Returns 0 if successful
- * Returns non-zero otherwise
- */
-static int ufshcd_pci_poweroff(struct device *dev)
-{
- struct ufs_hba *hba = dev_get_drvdata(dev);
- int spm_lvl = hba->spm_lvl;
- int ret;
-
- /*
- * For poweroff we need to set the UFS device to PowerDown mode.
- * Force spm_lvl to ensure that.
- */
- hba->spm_lvl = 5;
- ret = ufshcd_system_suspend(hba);
- hba->spm_lvl = spm_lvl;
- return ret;
-}
-
#endif /* !CONFIG_PM_SLEEP */
#ifdef CONFIG_PM
@@ -533,17 +510,14 @@ ufshcd_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
}
static const struct dev_pm_ops ufshcd_pci_pm_ops = {
-#ifdef CONFIG_PM_SLEEP
- .suspend = ufshcd_pci_suspend,
- .resume = ufshcd_pci_resume,
- .freeze = ufshcd_pci_suspend,
- .thaw = ufshcd_pci_resume,
- .poweroff = ufshcd_pci_poweroff,
- .restore = ufshcd_pci_resume,
-#endif
SET_RUNTIME_PM_OPS(ufshcd_pci_runtime_suspend,
ufshcd_pci_runtime_resume,
ufshcd_pci_runtime_idle)
+ SET_SYSTEM_SLEEP_PM_OPS(ufshcd_pci_suspend, ufshcd_pci_resume)
+#ifdef CONFIG_PM_SLEEP
+ .prepare = ufshcd_suspend_prepare,
+ .complete = ufshcd_resume_complete,
+#endif
};
static const struct pci_device_id ufshcd_pci_tbl[] = {
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 0625da7..0a58c9a 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -16,6 +16,7 @@
#include <linux/bitfield.h>
#include <linux/blk-pm.h>
#include <linux/blkdev.h>
+#include <scsi/scsi_driver.h>
#include "ufshcd.h"
#include "ufs_quirks.h"
#include "unipro.h"
@@ -77,6 +78,8 @@
/* Polling time to wait for fDeviceInit */
#define FDEVICEINIT_COMPL_TIMEOUT 1500 /* millisecs */
+#define wlun_dev_to_hba(dv) shost_priv(to_scsi_device(dv)->host)
+
#define ufshcd_toggle_vreg(_dev, _vreg, _on) \
({ \
int _ret; \
@@ -1551,7 +1554,7 @@ static ssize_t ufshcd_clkscale_enable_store(struct device *dev,
if (value == hba->clk_scaling.is_enabled)
goto out;
- pm_runtime_get_sync(hba->dev);
+ ufshcd_rpm_get_sync(hba);
ufshcd_hold(hba, false);
hba->clk_scaling.is_enabled = value;
@@ -1567,7 +1570,7 @@ static ssize_t ufshcd_clkscale_enable_store(struct device *dev,
}
ufshcd_release(hba);
- pm_runtime_put_sync(hba->dev);
+ ufshcd_rpm_put_sync(hba);
out:
up(&hba->host_sem);
return err ? err : count;
@@ -2565,6 +2568,17 @@ static inline u16 ufshcd_upiu_wlun_to_scsi_wlun(u8 upiu_wlun_id)
return (upiu_wlun_id & ~UFS_UPIU_WLUN_ID) | SCSI_W_LUN_BASE;
}
+static inline bool is_rpmb_wlun(struct scsi_device *sdev)
+{
+ return (sdev->lun == ufshcd_upiu_wlun_to_scsi_wlun(UFS_UPIU_RPMB_WLUN));
+}
+
+static inline bool is_device_wlun(struct scsi_device *sdev)
+{
+ return (sdev->lun ==
+ ufshcd_upiu_wlun_to_scsi_wlun(UFS_UPIU_UFS_DEVICE_WLUN));
+}
+
static void ufshcd_init_lrb(struct ufs_hba *hba, struct ufshcd_lrb *lrb, int i)
{
struct utp_transfer_cmd_desc *cmd_descp = hba->ucdl_base_addr;
@@ -4098,12 +4112,13 @@ void ufshcd_auto_hibern8_update(struct ufs_hba *hba, u32 ahit)
}
spin_unlock_irqrestore(hba->host->host_lock, flags);
- if (update && !pm_runtime_suspended(hba->dev)) {
- pm_runtime_get_sync(hba->dev);
+ if (update &&
+ !pm_runtime_suspended(&hba->sdev_ufs_device->sdev_gendev)) {
+ ufshcd_rpm_get_sync(hba);
ufshcd_hold(hba, false);
ufshcd_auto_hibern8_enable(hba);
ufshcd_release(hba);
- pm_runtime_put(hba->dev);
+ ufshcd_rpm_put_sync(hba);
}
}
EXPORT_SYMBOL_GPL(ufshcd_auto_hibern8_update);
@@ -4801,6 +4816,40 @@ static inline void ufshcd_get_lu_power_on_wp_status(struct ufs_hba *hba,
}
/**
+ * ufshcd_setup_links - associate link b/w device wlun and other luns
+ * @sdev: pointer to SCSI device
+ * @hba: pointer to ufs hba
+ */
+static void ufshcd_setup_links(struct ufs_hba *hba, struct scsi_device *sdev)
+{
+ struct device_link *link;
+
+ /*
+ * device wlun is the supplier & rest of the luns are consumers
+ * This ensures that device wlun suspends after all other luns.
+ */
+ if (hba->sdev_ufs_device) {
+ link = device_link_add(&sdev->sdev_gendev,
+ &hba->sdev_ufs_device->sdev_gendev,
+ DL_FLAG_PM_RUNTIME|DL_FLAG_RPM_ACTIVE);
+ if (!link) {
+ dev_err(&sdev->sdev_gendev, "Failed establishing link - %s\n",
+ dev_name(&hba->sdev_ufs_device->sdev_gendev));
+ return;
+ }
+ hba->luns_avail--;
+ /* Ignore REPORT_LUN wlun probing */
+ if (hba->luns_avail == 1) {
+ ufshcd_rpm_put(hba);
+ return;
+ }
+ } else {
+ /* device wlun is probed */
+ hba->luns_avail--;
+ }
+}
+
+/**
* ufshcd_slave_alloc - handle initial SCSI device configurations
* @sdev: pointer to SCSI device
*
@@ -4831,6 +4880,8 @@ static int ufshcd_slave_alloc(struct scsi_device *sdev)
ufshcd_get_lu_power_on_wp_status(hba, sdev);
+ ufshcd_setup_links(hba, sdev);
+
return 0;
}
@@ -4862,8 +4913,13 @@ static int ufshcd_slave_configure(struct scsi_device *sdev)
blk_queue_update_dma_pad(q, PRDT_DATA_BYTE_COUNT_PAD - 1);
if (hba->quirks & UFSHCD_QUIRK_ALIGN_SG_WITH_PAGE_SIZE)
blk_queue_update_dma_alignment(q, PAGE_SIZE - 1);
-
- if (ufshcd_is_rpm_autosuspend_allowed(hba))
+ /*
+ * Block runtime-pm until all consumers are added.
+ * Refer ufshcd_setup_links().
+ */
+ if (is_device_wlun(sdev))
+ pm_runtime_get_noresume(&sdev->sdev_gendev);
+ else if (ufshcd_is_rpm_autosuspend_allowed(hba))
sdev->rpm_autosuspend = 1;
ufshcd_crypto_setup_rq_keyslot_manager(hba, q);
@@ -4979,15 +5035,9 @@ ufshcd_transfer_rsp_status(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
*/
if (!hba->pm_op_in_progress &&
!ufshcd_eh_in_progress(hba) &&
- ufshcd_is_exception_event(lrbp->ucd_rsp_ptr) &&
- schedule_work(&hba->eeh_work)) {
- /*
- * Prevent suspend once eeh_work is scheduled
- * to avoid deadlock between ufshcd_suspend
- * and exception event handler.
- */
- pm_runtime_get_noresume(hba->dev);
- }
+ ufshcd_is_exception_event(lrbp->ucd_rsp_ptr))
+ /* Flushed in suspend */
+ schedule_work(&hba->eeh_work);
break;
case UPIU_TRANSACTION_REJECT_UPIU:
/* TODO: handle Reject UPIU Response */
@@ -5586,8 +5636,8 @@ static void ufshcd_rpm_dev_flush_recheck_work(struct work_struct *work)
* after a certain delay to recheck the threshold by next runtime
* suspend.
*/
- pm_runtime_get_sync(hba->dev);
- pm_runtime_put_sync(hba->dev);
+ ufshcd_rpm_get_sync(hba);
+ ufshcd_rpm_put_sync(hba);
}
/**
@@ -5604,7 +5654,6 @@ static void ufshcd_exception_event_handler(struct work_struct *work)
u32 status = 0;
hba = container_of(work, struct ufs_hba, eeh_work);
- pm_runtime_get_sync(hba->dev);
ufshcd_scsi_block_requests(hba);
err = ufshcd_get_ee_status(hba, &status);
if (err) {
@@ -5621,14 +5670,6 @@ static void ufshcd_exception_event_handler(struct work_struct *work)
ufs_debugfs_exception_event(hba, status);
out:
ufshcd_scsi_unblock_requests(hba);
- /*
- * pm_runtime_get_noresume is called while scheduling
- * eeh_work to avoid suspend racing with exception work.
- * Hence decrement usage counter using pm_runtime_put_noidle
- * to allow suspend on completion of exception event handler.
- */
- pm_runtime_put_noidle(hba->dev);
- pm_runtime_put(hba->dev);
return;
}
@@ -5753,12 +5794,13 @@ static void ufshcd_clk_scaling_suspend(struct ufs_hba *hba, bool suspend)
static void ufshcd_err_handling_prepare(struct ufs_hba *hba)
{
- pm_runtime_get_sync(hba->dev);
- if (pm_runtime_status_suspended(hba->dev) || hba->is_sys_suspended) {
+ ufshcd_rpm_get_sync(hba);
+ if (pm_runtime_status_suspended(&hba->sdev_ufs_device->sdev_gendev) ||
+ hba->is_sys_suspended) {
enum ufs_pm_op pm_op;
/*
- * Don't assume anything of pm_runtime_get_sync(), if
+ * Don't assume anything of resume, if
* resume fails, irq and clocks can be OFF, and powers
* can be OFF or in LPM.
*/
@@ -5794,7 +5836,7 @@ static void ufshcd_err_handling_unprepare(struct ufs_hba *hba)
if (ufshcd_is_clkscaling_supported(hba))
ufshcd_clk_scaling_suspend(hba, false);
ufshcd_clear_ua_wluns(hba);
- pm_runtime_put(hba->dev);
+ ufshcd_rpm_put(hba);
}
static inline bool ufshcd_err_handling_should_stop(struct ufs_hba *hba)
@@ -5815,14 +5857,18 @@ static void ufshcd_recover_pm_error(struct ufs_hba *hba)
hba->is_sys_suspended = false;
/*
- * Set RPM status of hba device to RPM_ACTIVE,
+ * Set RPM status of wlun device to RPM_ACTIVE,
* this also clears its runtime error.
*/
- ret = pm_runtime_set_active(hba->dev);
+ ret = pm_runtime_set_active(&hba->sdev_ufs_device->sdev_gendev);
+
+ /* hba device might have a runtime error otherwise */
+ if (ret)
+ ret = pm_runtime_set_active(hba->dev);
/*
- * If hba device had runtime error, we also need to resume those
- * scsi devices under hba in case any of them has failed to be
- * resumed due to hba runtime resume failure. This is to unblock
+ * If wlun device had runtime error, we also need to resume those
+ * consumer scsi devices in case any of them has failed to be
+ * resumed due to supplier runtime resume failure. This is to unblock
* blk_queue_enter in case there are bios waiting inside it.
*/
if (!ret) {
@@ -7246,7 +7292,6 @@ 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);
hba->sdev_rpmb = __scsi_add_device(hba->host, 0, 0,
@@ -7410,6 +7455,9 @@ static int ufs_get_device_desc(struct ufs_hba *hba)
goto out;
}
+ hba->luns_avail = desc_buf[DEVICE_DESC_PARAM_NUM_LU] +
+ desc_buf[DEVICE_DESC_PARAM_NUM_WLU];
+
ufs_fixup_device_setup(hba);
ufshcd_wb_probe(hba, desc_buf);
@@ -7887,6 +7935,7 @@ static int ufshcd_probe_hba(struct ufs_hba *hba, bool async)
ufshcd_set_ufs_dev_active(hba);
ufshcd_force_reset_auto_bkops(hba);
hba->wlun_dev_clr_ua = true;
+ hba->wlun_rpmb_clr_ua = true;
/* Gear up to HS gear if supported */
if (hba->max_pwr_info.is_valid) {
@@ -8472,7 +8521,8 @@ static int ufshcd_set_dev_pwr_mode(struct ufs_hba *hba,
* handling context.
*/
hba->host->eh_noresume = 1;
- ufshcd_clear_ua_wluns(hba);
+ if (hba->wlun_dev_clr_ua)
+ ufshcd_clear_ua_wlun(hba, UFS_UPIU_UFS_DEVICE_WLUN);
cmd[4] = pwr_mode << 4;
@@ -8647,23 +8697,7 @@ static void ufshcd_hba_vreg_set_hpm(struct ufs_hba *hba)
ufshcd_setup_hba_vreg(hba, true);
}
-/**
- * ufshcd_suspend - helper function for suspend operations
- * @hba: per adapter instance
- * @pm_op: desired low power operation type
- *
- * This function will try to put the UFS device and link into low power
- * mode based on the "rpm_lvl" (Runtime PM level) or "spm_lvl"
- * (System PM level).
- *
- * If this function is called during shutdown, it will make sure that
- * both UFS device and UFS link is powered off.
- *
- * NOTE: UFS device & link must be active before we enter in this function.
- *
- * Returns 0 for success and non-zero for failure
- */
-static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
+static int __ufshcd_wl_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
{
int ret = 0;
int check_for_bkops;
@@ -8671,7 +8705,7 @@ static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
enum ufs_dev_pwr_mode req_dev_pwr_mode;
enum uic_link_state req_link_state;
- hba->pm_op_in_progress = 1;
+ hba->pm_op_in_progress = true;
if (!ufshcd_is_shutdown_pm(pm_op)) {
pm_lvl = ufshcd_is_runtime_pm(pm_op) ?
hba->rpm_lvl : hba->spm_lvl;
@@ -8694,17 +8728,17 @@ static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
if (req_dev_pwr_mode == UFS_ACTIVE_PWR_MODE &&
req_link_state == UIC_LINK_ACTIVE_STATE) {
- goto disable_clks;
+ goto vops_suspend;
}
if ((req_dev_pwr_mode == hba->curr_dev_pwr_mode) &&
(req_link_state == hba->uic_link_state))
- goto enable_gating;
+ goto enable_scaling;
/* UFS device & link must be active before we enter in this function */
if (!ufshcd_is_ufs_dev_active(hba) || !ufshcd_is_link_active(hba)) {
ret = -EINVAL;
- goto enable_gating;
+ goto enable_scaling;
}
if (ufshcd_is_runtime_pm(pm_op)) {
@@ -8716,7 +8750,7 @@ static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
*/
ret = ufshcd_urgent_bkops(hba);
if (ret)
- goto enable_gating;
+ goto enable_scaling;
} else {
/* make sure that auto bkops is disabled */
ufshcd_disable_auto_bkops(hba);
@@ -8744,7 +8778,7 @@ static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
if (!hba->dev_info.b_rpm_dev_flush_capable) {
ret = ufshcd_set_dev_pwr_mode(hba, req_dev_pwr_mode);
if (ret)
- goto enable_gating;
+ goto enable_scaling;
}
}
@@ -8757,7 +8791,7 @@ static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
if (ret)
goto set_dev_active;
-disable_clks:
+vops_suspend:
/*
* Call vendor specific suspend callback. As these callbacks may access
* vendor specific host controller register space call them before the
@@ -8766,28 +8800,9 @@ static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
ret = ufshcd_vops_suspend(hba, pm_op);
if (ret)
goto set_link_active;
- /*
- * Disable the host irq as host controller as there won't be any
- * host controller transaction expected till resume.
- */
- ufshcd_disable_irq(hba);
-
- ufshcd_setup_clocks(hba, false);
-
- if (ufshcd_is_clkgating_allowed(hba)) {
- hba->clk_gating.state = CLKS_OFF;
- trace_ufshcd_clk_gating(dev_name(hba->dev),
- hba->clk_gating.state);
- }
-
- ufshcd_vreg_set_lpm(hba);
-
- /* Put the host controller in low power mode if possible */
- ufshcd_hba_vreg_set_lpm(hba);
goto out;
set_link_active:
- ufshcd_vreg_set_hpm(hba);
/*
* Device hardware reset is required to exit DeepSleep. Also, for
* DeepSleep, the link is off so host reset and restore will be done
@@ -8809,57 +8824,32 @@ static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
}
if (!ufshcd_set_dev_pwr_mode(hba, UFS_ACTIVE_PWR_MODE))
ufshcd_disable_auto_bkops(hba);
-enable_gating:
+enable_scaling:
if (ufshcd_is_clkscaling_supported(hba))
ufshcd_clk_scaling_suspend(hba, false);
- hba->clk_gating.is_suspended = false;
hba->dev_info.b_rpm_dev_flush_capable = false;
- ufshcd_clear_ua_wluns(hba);
- ufshcd_release(hba);
out:
if (hba->dev_info.b_rpm_dev_flush_capable) {
schedule_delayed_work(&hba->rpm_dev_flush_recheck_work,
msecs_to_jiffies(RPM_DEV_FLUSH_RECHECK_WORK_DELAY_MS));
}
- hba->pm_op_in_progress = 0;
-
- if (ret)
- ufshcd_update_evt_hist(hba, UFS_EVT_SUSPEND_ERR, (u32)ret);
+ if (ret) {
+ ufshcd_update_evt_hist(hba, UFS_EVT_WL_SUSP_ERR, (u32)ret);
+ hba->clk_gating.is_suspended = false;
+ ufshcd_release(hba);
+ }
+ hba->pm_op_in_progress = false;
return ret;
}
-/**
- * ufshcd_resume - helper function for resume operations
- * @hba: per adapter instance
- * @pm_op: runtime PM or system PM
- *
- * This function basically brings the UFS device, UniPro link and controller
- * to active state.
- *
- * Returns 0 for success and non-zero for failure
- */
-static int ufshcd_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op)
+static int __ufshcd_wl_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op)
{
int ret;
- enum uic_link_state old_link_state;
+ enum uic_link_state old_link_state = hba->uic_link_state;
- hba->pm_op_in_progress = 1;
- old_link_state = hba->uic_link_state;
-
- ufshcd_hba_vreg_set_hpm(hba);
- ret = ufshcd_vreg_set_hpm(hba);
- if (ret)
- goto out;
-
- /* Make sure clocks are enabled before accessing controller */
- ret = ufshcd_setup_clocks(hba, true);
- if (ret)
- goto disable_vreg;
-
- /* enable the host irq as host controller would be active soon */
- ufshcd_enable_irq(hba);
+ hba->pm_op_in_progress = true;
/*
* Call vendor specific resume callback. As these callbacks may access
@@ -8868,7 +8858,7 @@ static int ufshcd_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op)
*/
ret = ufshcd_vops_resume(hba, pm_op);
if (ret)
- goto disable_irq_and_vops_clks;
+ goto out;
/* For DeepSleep, the only supported option is to have the link off */
WARN_ON(ufshcd_is_ufs_dev_deepsleep(hba) && !ufshcd_is_link_off(hba));
@@ -8916,42 +8906,214 @@ static int ufshcd_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op)
if (hba->ee_usr_mask)
ufshcd_write_ee_control(hba);
- hba->clk_gating.is_suspended = false;
-
- if (ufshcd_is_clkscaling_supported(hba))
- ufshcd_clk_scaling_suspend(hba, false);
-
- /* Enable Auto-Hibernate if configured */
- ufshcd_auto_hibern8_enable(hba);
+ if (hba->clk_scaling.is_allowed)
+ ufshcd_resume_clkscaling(hba);
if (hba->dev_info.b_rpm_dev_flush_capable) {
hba->dev_info.b_rpm_dev_flush_capable = false;
cancel_delayed_work(&hba->rpm_dev_flush_recheck_work);
}
- ufshcd_clear_ua_wluns(hba);
-
- /* Schedule clock gating in case of no access to UFS device yet */
- ufshcd_release(hba);
-
+ /* Enable Auto-Hibernate if configured */
+ ufshcd_auto_hibern8_enable(hba);
goto out;
set_old_link_state:
ufshcd_link_state_transition(hba, old_link_state, 0);
vendor_suspend:
ufshcd_vops_suspend(hba, pm_op);
-disable_irq_and_vops_clks:
+out:
+ if (ret)
+ ufshcd_update_evt_hist(hba, UFS_EVT_WL_RES_ERR, (u32)ret);
+ hba->clk_gating.is_suspended = false;
+ ufshcd_release(hba);
+ hba->pm_op_in_progress = false;
+ return ret;
+}
+
+static int ufshcd_wl_runtime_suspend(struct device *dev)
+{
+ struct scsi_device *sdev = to_scsi_device(dev);
+ struct ufs_hba *hba;
+ int ret;
+ ktime_t start = ktime_get();
+
+ hba = shost_priv(sdev->host);
+
+ ret = __ufshcd_wl_suspend(hba, UFS_RUNTIME_PM);
+ if (ret)
+ dev_err(&sdev->sdev_gendev, "%s failed: %d\n", __func__, ret);
+
+ trace_ufshcd_wl_runtime_suspend(dev_name(dev), ret,
+ ktime_to_us(ktime_sub(ktime_get(), start)),
+ hba->curr_dev_pwr_mode, hba->uic_link_state);
+
+ return ret;
+}
+
+static int ufshcd_wl_runtime_resume(struct device *dev)
+{
+ struct scsi_device *sdev = to_scsi_device(dev);
+ struct ufs_hba *hba;
+ int ret = 0;
+ ktime_t start = ktime_get();
+
+ hba = shost_priv(sdev->host);
+
+ ret = __ufshcd_wl_resume(hba, UFS_RUNTIME_PM);
+ if (ret)
+ dev_err(&sdev->sdev_gendev, "%s failed: %d\n", __func__, ret);
+
+ trace_ufshcd_wl_runtime_resume(dev_name(dev), ret,
+ ktime_to_us(ktime_sub(ktime_get(), start)),
+ hba->curr_dev_pwr_mode, hba->uic_link_state);
+
+ return ret;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int ufshcd_wl_suspend(struct device *dev)
+{
+ struct scsi_device *sdev = to_scsi_device(dev);
+ struct ufs_hba *hba;
+ int ret;
+ ktime_t start = ktime_get();
+
+ hba = shost_priv(sdev->host);
+ down(&hba->host_sem);
+ ret = __ufshcd_wl_suspend(hba, UFS_SYSTEM_PM);
+ if (ret) {
+ dev_err(&sdev->sdev_gendev, "%s failed: %d\n", __func__, ret);
+ up(&hba->host_sem);
+ } else {
+ hba->is_sys_suspended = true;
+ }
+
+ trace_ufshcd_wl_suspend(dev_name(dev), ret,
+ ktime_to_us(ktime_sub(ktime_get(), start)),
+ hba->curr_dev_pwr_mode, hba->uic_link_state);
+
+ return ret;
+}
+
+static int ufshcd_wl_resume(struct device *dev)
+{
+ struct scsi_device *sdev = to_scsi_device(dev);
+ struct ufs_hba *hba;
+ int ret = 0;
+ ktime_t start = ktime_get();
+
+ if (pm_runtime_suspended(dev))
+ goto out;
+
+ hba = shost_priv(sdev->host);
+
+ ret = __ufshcd_wl_resume(hba, UFS_SYSTEM_PM);
+ if (ret)
+ dev_err(&sdev->sdev_gendev, "%s failed: %d\n", __func__, ret);
+out:
+ trace_ufshcd_wl_resume(dev_name(dev), ret,
+ ktime_to_us(ktime_sub(ktime_get(), start)),
+ hba->curr_dev_pwr_mode, hba->uic_link_state);
+ if (!ret)
+ hba->is_sys_suspended = false;
+ up(&hba->host_sem);
+ return ret;
+}
+#endif
+
+static void ufshcd_wl_shutdown(struct device *dev)
+{
+ struct scsi_device *sdev = to_scsi_device(dev);
+ struct ufs_hba *hba;
+
+ hba = shost_priv(sdev->host);
+
+ down(&hba->host_sem);
+ hba->shutting_down = true;
+ up(&hba->host_sem);
+
+ /* Turn on everything while shutting down */
+ ufshcd_rpm_get_sync(hba);
+ scsi_device_quiesce(sdev);
+ shost_for_each_device(sdev, hba->host) {
+ if (sdev == hba->sdev_ufs_device)
+ continue;
+ scsi_device_quiesce(sdev);
+ }
+ __ufshcd_wl_suspend(hba, UFS_SHUTDOWN_PM);
+}
+
+/**
+ * ufshcd_suspend - helper function for suspend operations
+ * @hba: per adapter instance
+ *
+ * This function will put disable irqs, turn off clocks
+ * and set vreg and hba-vreg in lpm mode.
+ * Also check the description of __ufshcd_wl_suspend().
+ */
+static int ufshcd_suspend(struct ufs_hba *hba)
+{
+ int ret;
+
+ if (!hba->is_powered)
+ return 0;
+ /*
+ * Disable the host irq as host controller as there won't be any
+ * host controller transaction expected till resume.
+ */
ufshcd_disable_irq(hba);
- ufshcd_setup_clocks(hba, false);
+ ret = ufshcd_setup_clocks(hba, false);
+ if (ret) {
+ ufshcd_enable_irq(hba);
+ return ret;
+ }
if (ufshcd_is_clkgating_allowed(hba)) {
hba->clk_gating.state = CLKS_OFF;
trace_ufshcd_clk_gating(dev_name(hba->dev),
hba->clk_gating.state);
}
+
+ ufshcd_vreg_set_lpm(hba);
+ /* Put the host controller in low power mode if possible */
+ ufshcd_hba_vreg_set_lpm(hba);
+ return ret;
+}
+
+/**
+ * ufshcd_resume - helper function for resume operations
+ * @hba: per adapter instance
+ *
+ * This function basically turns on the regulators, clocks and
+ * irqs of the hba.
+ * Also check the description of __ufshcd_wl_resume().
+ *
+ * Returns 0 for success and non-zero for failure
+ */
+static int ufshcd_resume(struct ufs_hba *hba)
+{
+ int ret;
+
+ if (!hba->is_powered)
+ return 0;
+
+ ufshcd_hba_vreg_set_hpm(hba);
+ ret = ufshcd_vreg_set_hpm(hba);
+ if (ret)
+ goto out;
+
+ /* Make sure clocks are enabled before accessing controller */
+ ret = ufshcd_setup_clocks(hba, true);
+ if (ret)
+ goto disable_vreg;
+
+ /* enable the host irq as host controller would be active soon */
+ ufshcd_enable_irq(hba);
+ goto out;
+
disable_vreg:
ufshcd_vreg_set_lpm(hba);
out:
- hba->pm_op_in_progress = 0;
if (ret)
ufshcd_update_evt_hist(hba, UFS_EVT_RESUME_ERR, (u32)ret);
return ret;
@@ -8962,49 +9124,23 @@ static int ufshcd_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op)
* @hba: per adapter instance
*
* Check the description of ufshcd_suspend() function for more details.
+ * Also check the description of __ufshcd_wl_suspend().
*
* Returns 0 for success and non-zero for failure
*/
int ufshcd_system_suspend(struct ufs_hba *hba)
{
- int ret = 0;
+ int ret;
ktime_t start = ktime_get();
- down(&hba->host_sem);
-
- if (!hba->is_powered)
- return 0;
-
- if ((ufs_get_pm_lvl_to_dev_pwr_mode(hba->spm_lvl) ==
- hba->curr_dev_pwr_mode) &&
- (ufs_get_pm_lvl_to_link_pwr_state(hba->spm_lvl) ==
- hba->uic_link_state) &&
- !hba->dev_info.b_rpm_dev_flush_capable)
+ if (pm_runtime_suspended(hba->dev))
goto out;
- if (pm_runtime_suspended(hba->dev)) {
- /*
- * UFS device and/or UFS link low power states during runtime
- * suspend seems to be different than what is expected during
- * system suspend. Hence runtime resume the devic & link and
- * let the system suspend low power states to take effect.
- * TODO: If resume takes longer time, we might have optimize
- * it in future by not resuming everything if possible.
- */
- ret = ufshcd_runtime_resume(hba);
- if (ret)
- goto out;
- }
-
- ret = ufshcd_suspend(hba, UFS_SYSTEM_PM);
+ ret = ufshcd_suspend(hba);
out:
trace_ufshcd_system_suspend(dev_name(hba->dev), ret,
ktime_to_us(ktime_sub(ktime_get(), start)),
hba->curr_dev_pwr_mode, hba->uic_link_state);
- if (!ret)
- hba->is_sys_suspended = true;
- else
- up(&hba->host_sem);
return ret;
}
EXPORT_SYMBOL(ufshcd_system_suspend);
@@ -9018,24 +9154,19 @@ EXPORT_SYMBOL(ufshcd_system_suspend);
int ufshcd_system_resume(struct ufs_hba *hba)
{
- int ret = 0;
+ int ret;
ktime_t start = ktime_get();
- if (!hba->is_powered || pm_runtime_suspended(hba->dev))
- /*
- * Let the runtime resume take care of resuming
- * if runtime suspended.
- */
+ if (pm_runtime_suspended(hba->dev))
goto out;
- else
- ret = ufshcd_resume(hba, UFS_SYSTEM_PM);
+
+ ret = ufshcd_resume(hba);
+
out:
trace_ufshcd_system_resume(dev_name(hba->dev), ret,
ktime_to_us(ktime_sub(ktime_get(), start)),
hba->curr_dev_pwr_mode, hba->uic_link_state);
- if (!ret)
- hba->is_sys_suspended = false;
- up(&hba->host_sem);
+
return ret;
}
EXPORT_SYMBOL(ufshcd_system_resume);
@@ -9045,19 +9176,17 @@ EXPORT_SYMBOL(ufshcd_system_resume);
* @hba: per adapter instance
*
* Check the description of ufshcd_suspend() function for more details.
+ * Also check the description of __ufshcd_wl_suspend().
*
* Returns 0 for success and non-zero for failure
*/
int ufshcd_runtime_suspend(struct ufs_hba *hba)
{
- int ret = 0;
+ int ret;
ktime_t start = ktime_get();
- if (!hba->is_powered)
- goto out;
- else
- ret = ufshcd_suspend(hba, UFS_RUNTIME_PM);
-out:
+ ret = ufshcd_suspend(hba);
+
trace_ufshcd_runtime_suspend(dev_name(hba->dev), ret,
ktime_to_us(ktime_sub(ktime_get(), start)),
hba->curr_dev_pwr_mode, hba->uic_link_state);
@@ -9069,33 +9198,19 @@ EXPORT_SYMBOL(ufshcd_runtime_suspend);
* ufshcd_runtime_resume - runtime resume routine
* @hba: per adapter instance
*
- * This function basically brings the UFS device, UniPro link and controller
+ * This function basically brings controller
* to active state. Following operations are done in this function:
*
* 1. Turn on all the controller related clocks
- * 2. Bring the UniPro link out of Hibernate state
- * 3. If UFS device is in sleep state, turn ON VCC rail and bring the UFS device
- * to active state.
- * 4. If auto-bkops is enabled on the device, disable it.
- *
- * So following would be the possible power state after this function return
- * successfully:
- * S1: UFS device in Active state with VCC rail ON
- * UniPro link in Active state
- * All the UFS/UniPro controller clocks are ON
- *
- * Returns 0 for success and non-zero for failure
+ * 2. Turn ON VCC rail
*/
int ufshcd_runtime_resume(struct ufs_hba *hba)
{
- int ret = 0;
+ int ret;
ktime_t start = ktime_get();
- if (!hba->is_powered)
- goto out;
- else
- ret = ufshcd_resume(hba, UFS_RUNTIME_PM);
-out:
+ ret = ufshcd_resume(hba);
+
trace_ufshcd_runtime_resume(dev_name(hba->dev), ret,
ktime_to_us(ktime_sub(ktime_get(), start)),
hba->curr_dev_pwr_mode, hba->uic_link_state);
@@ -9113,30 +9228,20 @@ EXPORT_SYMBOL(ufshcd_runtime_idle);
* ufshcd_shutdown - shutdown routine
* @hba: per adapter instance
*
- * This function would power off both UFS device and UFS link.
+ * This function would turn off both UFS device and UFS hba
+ * regulators. It would also disable clocks.
*
* Returns 0 always to allow force shutdown even in case of errors.
*/
int ufshcd_shutdown(struct ufs_hba *hba)
{
- int ret = 0;
-
- down(&hba->host_sem);
- hba->shutting_down = true;
- up(&hba->host_sem);
-
- if (!hba->is_powered)
- goto out;
-
if (ufshcd_is_ufs_dev_poweroff(hba) && ufshcd_is_link_off(hba))
goto out;
pm_runtime_get_sync(hba->dev);
- ret = ufshcd_suspend(hba, UFS_SHUTDOWN_PM);
+ ufshcd_suspend(hba);
out:
- if (ret)
- dev_err(hba->dev, "%s failed, err %d\n", __func__, ret);
hba->is_powered = false;
/* allow force shutdown even in case of errors */
return 0;
@@ -9150,6 +9255,8 @@ EXPORT_SYMBOL(ufshcd_shutdown);
*/
void ufshcd_remove(struct ufs_hba *hba)
{
+ if (hba->sdev_ufs_device)
+ ufshcd_rpm_get_sync(hba);
ufs_bsg_remove(hba);
ufs_sysfs_remove_nodes(hba->dev);
blk_cleanup_queue(hba->tmf_queue);
@@ -9453,15 +9560,176 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq)
}
EXPORT_SYMBOL_GPL(ufshcd_init);
+void ufshcd_resume_complete(struct device *dev)
+{
+ struct ufs_hba *hba = dev_get_drvdata(dev);
+
+ ufshcd_rpm_put(hba);
+}
+EXPORT_SYMBOL_GPL(ufshcd_resume_complete);
+
+int ufshcd_suspend_prepare(struct device *dev)
+{
+ struct ufs_hba *hba = dev_get_drvdata(dev);
+
+ /*
+ * SCSI assumes that runtime-pm and system-pm for scsi drivers
+ * are same. And it doesn't wake up the device for system-suspend
+ * if it's runtime suspended. But ufs doesn't follow that.
+ * The rpm-lvl and spm-lvl can be different in ufs.
+ * Force it to honor system-suspend.
+ * Refer ufshcd_resume_complete()
+ */
+ ufshcd_rpm_get_sync(hba);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ufshcd_suspend_prepare);
+
+#ifdef CONFIG_PM_SLEEP
+static int ufshcd_wl_poweroff(struct device *dev)
+{
+ struct scsi_device *sdev = to_scsi_device(dev);
+ struct ufs_hba *hba = shost_priv(sdev->host);
+
+ __ufshcd_wl_suspend(hba, UFS_SHUTDOWN_PM);
+ return 0;
+}
+#endif
+
+static int ufshcd_wl_probe(struct device *dev)
+{
+ struct scsi_device *sdev = to_scsi_device(dev);
+
+ if (!is_device_wlun(sdev))
+ return -ENODEV;
+
+ blk_pm_runtime_init(sdev->request_queue, dev);
+ pm_runtime_set_autosuspend_delay(dev, 0);
+ pm_runtime_allow(dev);
+
+ return 0;
+}
+
+static int ufshcd_wl_remove(struct device *dev)
+{
+ pm_runtime_forbid(dev);
+ return 0;
+}
+
+static const struct dev_pm_ops ufshcd_wl_pm_ops = {
+#ifdef CONFIG_PM_SLEEP
+ .suspend = ufshcd_wl_suspend,
+ .resume = ufshcd_wl_resume,
+ .freeze = ufshcd_wl_suspend,
+ .thaw = ufshcd_wl_resume,
+ .poweroff = ufshcd_wl_poweroff,
+ .restore = ufshcd_wl_resume,
+#endif
+ SET_RUNTIME_PM_OPS(ufshcd_wl_runtime_suspend, ufshcd_wl_runtime_resume, NULL)
+};
+
+/**
+ * ufs_dev_wlun_template - describes ufs device wlun
+ * ufs-device wlun - used to send pm commands
+ * All luns are consumers of ufs-device wlun.
+ *
+ * Currently, no sd driver is present for wluns.
+ * Hence the no specific pm operations are performed.
+ * With ufs design, SSU should be sent to ufs-device wlun.
+ * Hence register a scsi driver for ufs wluns only.
+ */
+static struct scsi_driver ufs_dev_wlun_template = {
+ .gendrv = {
+ .name = "ufs_device_wlun",
+ .owner = THIS_MODULE,
+ .probe = ufshcd_wl_probe,
+ .remove = ufshcd_wl_remove,
+ .pm = &ufshcd_wl_pm_ops,
+ .shutdown = ufshcd_wl_shutdown,
+ },
+};
+
+static int ufshcd_rpmb_probe(struct device *dev)
+{
+ return is_rpmb_wlun(to_scsi_device(dev)) ? 0 : -ENODEV;
+}
+
+static inline int ufshcd_clear_rpmb_uac(struct ufs_hba *hba)
+{
+ int ret = 0;
+
+ if (!hba->wlun_rpmb_clr_ua)
+ return 0;
+ ret = ufshcd_clear_ua_wlun(hba, UFS_UPIU_RPMB_WLUN);
+ if (!ret)
+ hba->wlun_rpmb_clr_ua = 0;
+ return ret;
+}
+
+static int ufshcd_rpmb_runtime_resume(struct device *dev)
+{
+ struct ufs_hba *hba = wlun_dev_to_hba(dev);
+
+ if (hba->sdev_rpmb)
+ return ufshcd_clear_rpmb_uac(hba);
+ return 0;
+}
+
+static int ufshcd_rpmb_resume(struct device *dev)
+{
+ struct ufs_hba *hba = wlun_dev_to_hba(dev);
+
+ if (hba->sdev_rpmb && !pm_runtime_suspended(dev))
+ return ufshcd_clear_rpmb_uac(hba);
+ return 0;
+}
+
+static const struct dev_pm_ops ufs_rpmb_pm_ops = {
+ SET_RUNTIME_PM_OPS(NULL, ufshcd_rpmb_runtime_resume, NULL)
+ SET_SYSTEM_SLEEP_PM_OPS(NULL, ufshcd_rpmb_resume)
+};
+
+/**
+ * Describes the ufs rpmb wlun.
+ * Used only to send uac.
+ */
+static struct scsi_driver ufs_rpmb_wlun_template = {
+ .gendrv = {
+ .name = "ufs_rpmb_wlun",
+ .owner = THIS_MODULE,
+ .probe = ufshcd_rpmb_probe,
+ .pm = &ufs_rpmb_pm_ops,
+ },
+};
+
static int __init ufshcd_core_init(void)
{
+ int ret;
+
ufs_debugfs_init();
- return 0;
+
+ ret = scsi_register_driver(&ufs_dev_wlun_template.gendrv);
+ if (ret)
+ goto debugfs_exit;
+
+ ret = scsi_register_driver(&ufs_rpmb_wlun_template.gendrv);
+ if (ret)
+ goto unregister;
+
+ return ret;
+unregister:
+ scsi_unregister_driver(&ufs_dev_wlun_template.gendrv);
+debugfs_exit:
+ ufs_debugfs_exit();
+ return ret;
}
static void __exit ufshcd_core_exit(void)
{
ufs_debugfs_exit();
+ scsi_unregister_driver(&ufs_rpmb_wlun_template.gendrv);
+ scsi_unregister_driver(&ufs_dev_wlun_template.gendrv);
}
module_init(ufshcd_core_init);
diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
index 5eb66a8..3a8dc0d 100644
--- a/drivers/scsi/ufs/ufshcd.h
+++ b/drivers/scsi/ufs/ufshcd.h
@@ -72,6 +72,8 @@ enum ufs_event_type {
UFS_EVT_LINK_STARTUP_FAIL,
UFS_EVT_RESUME_ERR,
UFS_EVT_SUSPEND_ERR,
+ UFS_EVT_WL_SUSP_ERR,
+ UFS_EVT_WL_RES_ERR,
/* abnormal events */
UFS_EVT_DEV_RESET,
@@ -807,6 +809,7 @@ struct ufs_hba {
struct list_head clk_list_head;
bool wlun_dev_clr_ua;
+ bool wlun_rpmb_clr_ua;
/* Number of requests aborts */
int req_abort_count;
@@ -846,6 +849,7 @@ struct ufs_hba {
struct delayed_work debugfs_ee_work;
u32 debugfs_ee_rate_limit_ms;
#endif
+ u32 luns_avail;
};
/* Returns true if clocks can be gated. Otherwise false */
@@ -1105,6 +1109,8 @@ int ufshcd_exec_raw_upiu_cmd(struct ufs_hba *hba,
enum query_opcode desc_op);
int ufshcd_wb_toggle(struct ufs_hba *hba, bool enable);
+int ufshcd_suspend_prepare(struct device *dev);
+void ufshcd_resume_complete(struct device *dev);
/* Wrapper functions for safely calling variant operations */
static inline const char *ufshcd_get_var_name(struct ufs_hba *hba)
@@ -1309,4 +1315,19 @@ static inline int ufshcd_update_ee_usr_mask(struct ufs_hba *hba,
&hba->ee_drv_mask, set, clr);
}
+static inline int ufshcd_rpm_get_sync(struct ufs_hba *hba)
+{
+ return pm_runtime_get_sync(&hba->sdev_ufs_device->sdev_gendev);
+}
+
+static inline int ufshcd_rpm_put_sync(struct ufs_hba *hba)
+{
+ return pm_runtime_put_sync(&hba->sdev_ufs_device->sdev_gendev);
+}
+
+static inline int ufshcd_rpm_put(struct ufs_hba *hba)
+{
+ return pm_runtime_put(&hba->sdev_ufs_device->sdev_gendev);
+}
+
#endif /* End of Header */
diff --git a/include/trace/events/ufs.h b/include/trace/events/ufs.h
index 1cb6f1a..599739e 100644
--- a/include/trace/events/ufs.h
+++ b/include/trace/events/ufs.h
@@ -246,6 +246,26 @@ DEFINE_EVENT(ufshcd_template, ufshcd_init,
int dev_state, int link_state),
TP_ARGS(dev_name, err, usecs, dev_state, link_state));
+DEFINE_EVENT(ufshcd_template, ufshcd_wl_suspend,
+ TP_PROTO(const char *dev_name, int err, s64 usecs,
+ int dev_state, int link_state),
+ TP_ARGS(dev_name, err, usecs, dev_state, link_state));
+
+DEFINE_EVENT(ufshcd_template, ufshcd_wl_resume,
+ TP_PROTO(const char *dev_name, int err, s64 usecs,
+ int dev_state, int link_state),
+ TP_ARGS(dev_name, err, usecs, dev_state, link_state));
+
+DEFINE_EVENT(ufshcd_template, ufshcd_wl_runtime_suspend,
+ TP_PROTO(const char *dev_name, int err, s64 usecs,
+ int dev_state, int link_state),
+ TP_ARGS(dev_name, err, usecs, dev_state, link_state));
+
+DEFINE_EVENT(ufshcd_template, ufshcd_wl_runtime_resume,
+ TP_PROTO(const char *dev_name, int err, s64 usecs,
+ int dev_state, int link_state),
+ TP_ARGS(dev_name, err, usecs, dev_state, link_state));
+
TRACE_EVENT(ufshcd_command,
TP_PROTO(const char *dev_name, enum ufs_trace_str_t str_t,
unsigned int tag, u32 doorbell, int transfer_len, u32 intr,
--
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.
^ permalink raw reply related [flat|nested] 10+ messages in thread
* [PATCH v18 2/2] ufs: sysfs: Resume the proper scsi device
2021-04-14 18:58 [PATCH v18 0/2] Enable power management for ufs wlun Asutosh Das
2021-04-14 18:58 ` [PATCH v18 1/2] scsi: ufs: Enable power management for wlun Asutosh Das
@ 2021-04-14 18:58 ` Asutosh Das
2021-04-15 9:21 ` Adrian Hunter
1 sibling, 1 reply; 10+ messages in thread
From: Asutosh Das @ 2021-04-14 18:58 UTC (permalink / raw)
To: cang, martin.petersen, adrian.hunter, linux-scsi
Cc: Asutosh Das, linux-arm-msm, Alim Akhtar, Avri Altman,
James E.J. Bottomley, Stanley Chu, Bean Huo, Yue Hu, open list
Resumes the actual scsi device the unit descriptor of which
is being accessed instead of the hba alone.
Reviewed-by: Can Guo <cang@codeaurora.org>
Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
---
drivers/scsi/ufs/ufs-sysfs.c | 24 ++++++++++++------------
1 file changed, 12 insertions(+), 12 deletions(-)
diff --git a/drivers/scsi/ufs/ufs-sysfs.c b/drivers/scsi/ufs/ufs-sysfs.c
index d7c3cff..4d9d4d8 100644
--- a/drivers/scsi/ufs/ufs-sysfs.c
+++ b/drivers/scsi/ufs/ufs-sysfs.c
@@ -245,9 +245,9 @@ static ssize_t wb_on_store(struct device *dev, struct device_attribute *attr,
goto out;
}
- pm_runtime_get_sync(hba->dev);
+ ufshcd_rpm_get_sync(hba);
res = ufshcd_wb_toggle(hba, wb_enable);
- pm_runtime_put_sync(hba->dev);
+ ufshcd_rpm_put_sync(hba);
out:
up(&hba->host_sem);
return res < 0 ? res : count;
@@ -297,10 +297,10 @@ static ssize_t ufs_sysfs_read_desc_param(struct ufs_hba *hba,
goto out;
}
- pm_runtime_get_sync(hba->dev);
+ ufshcd_rpm_get_sync(hba);
ret = ufshcd_read_desc_param(hba, desc_id, desc_index,
param_offset, desc_buf, param_size);
- pm_runtime_put_sync(hba->dev);
+ ufshcd_rpm_put_sync(hba);
if (ret) {
ret = -EINVAL;
goto out;
@@ -678,7 +678,7 @@ static ssize_t _name##_show(struct device *dev, \
up(&hba->host_sem); \
return -ENOMEM; \
} \
- pm_runtime_get_sync(hba->dev); \
+ ufshcd_rpm_get_sync(hba); \
ret = ufshcd_query_descriptor_retry(hba, \
UPIU_QUERY_OPCODE_READ_DESC, QUERY_DESC_IDN_DEVICE, \
0, 0, desc_buf, &desc_len); \
@@ -695,7 +695,7 @@ static ssize_t _name##_show(struct device *dev, \
goto out; \
ret = sysfs_emit(buf, "%s\n", desc_buf); \
out: \
- pm_runtime_put_sync(hba->dev); \
+ ufshcd_rpm_put_sync(hba); \
kfree(desc_buf); \
up(&hba->host_sem); \
return ret; \
@@ -744,10 +744,10 @@ static ssize_t _name##_show(struct device *dev, \
} \
if (ufshcd_is_wb_flags(QUERY_FLAG_IDN##_uname)) \
index = ufshcd_wb_get_query_index(hba); \
- pm_runtime_get_sync(hba->dev); \
+ ufshcd_rpm_get_sync(hba); \
ret = ufshcd_query_flag(hba, UPIU_QUERY_OPCODE_READ_FLAG, \
QUERY_FLAG_IDN##_uname, index, &flag); \
- pm_runtime_put_sync(hba->dev); \
+ ufshcd_rpm_put_sync(hba); \
if (ret) { \
ret = -EINVAL; \
goto out; \
@@ -813,10 +813,10 @@ static ssize_t _name##_show(struct device *dev, \
} \
if (ufshcd_is_wb_attrs(QUERY_ATTR_IDN##_uname)) \
index = ufshcd_wb_get_query_index(hba); \
- pm_runtime_get_sync(hba->dev); \
+ ufshcd_rpm_get_sync(hba); \
ret = ufshcd_query_attr(hba, UPIU_QUERY_OPCODE_READ_ATTR, \
QUERY_ATTR_IDN##_uname, index, 0, &value); \
- pm_runtime_put_sync(hba->dev); \
+ ufshcd_rpm_put_sync(hba); \
if (ret) { \
ret = -EINVAL; \
goto out; \
@@ -964,10 +964,10 @@ static ssize_t dyn_cap_needed_attribute_show(struct device *dev,
goto out;
}
- pm_runtime_get_sync(hba->dev);
+ ufshcd_rpm_get_sync(hba);
ret = ufshcd_query_attr(hba, UPIU_QUERY_OPCODE_READ_ATTR,
QUERY_ATTR_IDN_DYN_CAP_NEEDED, lun, 0, &value);
- pm_runtime_put_sync(hba->dev);
+ ufshcd_rpm_put_sync(hba);
if (ret) {
ret = -EINVAL;
goto out;
--
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.
^ permalink raw reply related [flat|nested] 10+ messages in thread
* Re: [PATCH v18 1/2] scsi: ufs: Enable power management for wlun
2021-04-14 18:58 ` [PATCH v18 1/2] scsi: ufs: Enable power management for wlun Asutosh Das
@ 2021-04-14 22:41 ` kernel test robot
2021-04-15 11:06 ` Adrian Hunter
` (2 subsequent siblings)
3 siblings, 0 replies; 10+ messages in thread
From: kernel test robot @ 2021-04-14 22:41 UTC (permalink / raw)
To: Asutosh Das, cang, martin.petersen, adrian.hunter, linux-scsi
Cc: kbuild-all, clang-built-linux, Asutosh Das, linux-arm-msm,
Alim Akhtar, Avri Altman, James E.J. Bottomley, Pedro Sousa
[-- Attachment #1: Type: text/plain, Size: 4420 bytes --]
Hi Asutosh,
I love your patch! Perhaps something to improve:
[auto build test WARNING on mkp-scsi/for-next]
[also build test WARNING on scsi/for-next next-20210414]
[cannot apply to tip/perf/core v5.12-rc7]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]
url: https://github.com/0day-ci/linux/commits/Asutosh-Das/Enable-power-management-for-ufs-wlun/20210415-030146
base: https://git.kernel.org/pub/scm/linux/kernel/git/mkp/scsi.git for-next
config: x86_64-randconfig-a002-20210414 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 9829f5e6b1bca9b61efc629770d28bb9014dec45)
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# install x86_64 cross compiling tool for clang build
# apt-get install binutils-x86-64-linux-gnu
# https://github.com/0day-ci/linux/commit/9bad6c1c707d2a9974aa90e3399e510ec06c77f2
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Asutosh-Das/Enable-power-management-for-ufs-wlun/20210415-030146
git checkout 9bad6c1c707d2a9974aa90e3399e510ec06c77f2
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=x86_64
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>
All warnings (new ones prefixed by >>):
>> drivers/scsi/ufs/ufshcd.c:9136:6: warning: variable 'ret' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
if (pm_runtime_suspended(hba->dev))
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/scsi/ufs/ufshcd.c:9141:50: note: uninitialized use occurs here
trace_ufshcd_system_suspend(dev_name(hba->dev), ret,
^~~
drivers/scsi/ufs/ufshcd.c:9136:2: note: remove the 'if' if its condition is always false
if (pm_runtime_suspended(hba->dev))
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/scsi/ufs/ufshcd.c:9133:9: note: initialize the variable 'ret' to silence this warning
int ret;
^
= 0
drivers/scsi/ufs/ufshcd.c:9160:6: warning: variable 'ret' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
if (pm_runtime_suspended(hba->dev))
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/scsi/ufs/ufshcd.c:9166:49: note: uninitialized use occurs here
trace_ufshcd_system_resume(dev_name(hba->dev), ret,
^~~
drivers/scsi/ufs/ufshcd.c:9160:2: note: remove the 'if' if its condition is always false
if (pm_runtime_suspended(hba->dev))
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/scsi/ufs/ufshcd.c:9157:9: note: initialize the variable 'ret' to silence this warning
int ret;
^
= 0
drivers/scsi/ufs/ufshcd.c:9679:12: warning: unused function 'ufshcd_rpmb_resume' [-Wunused-function]
static int ufshcd_rpmb_resume(struct device *dev)
^
3 warnings generated.
vim +9136 drivers/scsi/ufs/ufshcd.c
9121
9122 /**
9123 * ufshcd_system_suspend - system suspend routine
9124 * @hba: per adapter instance
9125 *
9126 * Check the description of ufshcd_suspend() function for more details.
9127 * Also check the description of __ufshcd_wl_suspend().
9128 *
9129 * Returns 0 for success and non-zero for failure
9130 */
9131 int ufshcd_system_suspend(struct ufs_hba *hba)
9132 {
9133 int ret;
9134 ktime_t start = ktime_get();
9135
> 9136 if (pm_runtime_suspended(hba->dev))
9137 goto out;
9138
9139 ret = ufshcd_suspend(hba);
9140 out:
9141 trace_ufshcd_system_suspend(dev_name(hba->dev), ret,
9142 ktime_to_us(ktime_sub(ktime_get(), start)),
9143 hba->curr_dev_pwr_mode, hba->uic_link_state);
9144 return ret;
9145 }
9146 EXPORT_SYMBOL(ufshcd_system_suspend);
9147
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
[-- Attachment #2: .config.gz --]
[-- Type: application/gzip, Size: 44195 bytes --]
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [PATCH v18 2/2] ufs: sysfs: Resume the proper scsi device
2021-04-14 18:58 ` [PATCH v18 2/2] ufs: sysfs: Resume the proper scsi device Asutosh Das
@ 2021-04-15 9:21 ` Adrian Hunter
0 siblings, 0 replies; 10+ messages in thread
From: Adrian Hunter @ 2021-04-15 9:21 UTC (permalink / raw)
To: Asutosh Das, cang, martin.petersen, linux-scsi
Cc: linux-arm-msm, Alim Akhtar, Avri Altman, James E.J. Bottomley,
Stanley Chu, Bean Huo, Yue Hu, open list
On 14/04/21 9:58 pm, Asutosh Das wrote:
> Resumes the actual scsi device the unit descriptor of which
> is being accessed instead of the hba alone.
>
> Reviewed-by: Can Guo <cang@codeaurora.org>
> Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
Reviewed-by: Adrian Hunter <adrian.hunter@intel.com>
> ---
> drivers/scsi/ufs/ufs-sysfs.c | 24 ++++++++++++------------
> 1 file changed, 12 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/scsi/ufs/ufs-sysfs.c b/drivers/scsi/ufs/ufs-sysfs.c
> index d7c3cff..4d9d4d8 100644
> --- a/drivers/scsi/ufs/ufs-sysfs.c
> +++ b/drivers/scsi/ufs/ufs-sysfs.c
> @@ -245,9 +245,9 @@ static ssize_t wb_on_store(struct device *dev, struct device_attribute *attr,
> goto out;
> }
>
> - pm_runtime_get_sync(hba->dev);
> + ufshcd_rpm_get_sync(hba);
> res = ufshcd_wb_toggle(hba, wb_enable);
> - pm_runtime_put_sync(hba->dev);
> + ufshcd_rpm_put_sync(hba);
> out:
> up(&hba->host_sem);
> return res < 0 ? res : count;
> @@ -297,10 +297,10 @@ static ssize_t ufs_sysfs_read_desc_param(struct ufs_hba *hba,
> goto out;
> }
>
> - pm_runtime_get_sync(hba->dev);
> + ufshcd_rpm_get_sync(hba);
> ret = ufshcd_read_desc_param(hba, desc_id, desc_index,
> param_offset, desc_buf, param_size);
> - pm_runtime_put_sync(hba->dev);
> + ufshcd_rpm_put_sync(hba);
> if (ret) {
> ret = -EINVAL;
> goto out;
> @@ -678,7 +678,7 @@ static ssize_t _name##_show(struct device *dev, \
> up(&hba->host_sem); \
> return -ENOMEM; \
> } \
> - pm_runtime_get_sync(hba->dev); \
> + ufshcd_rpm_get_sync(hba); \
> ret = ufshcd_query_descriptor_retry(hba, \
> UPIU_QUERY_OPCODE_READ_DESC, QUERY_DESC_IDN_DEVICE, \
> 0, 0, desc_buf, &desc_len); \
> @@ -695,7 +695,7 @@ static ssize_t _name##_show(struct device *dev, \
> goto out; \
> ret = sysfs_emit(buf, "%s\n", desc_buf); \
> out: \
> - pm_runtime_put_sync(hba->dev); \
> + ufshcd_rpm_put_sync(hba); \
> kfree(desc_buf); \
> up(&hba->host_sem); \
> return ret; \
> @@ -744,10 +744,10 @@ static ssize_t _name##_show(struct device *dev, \
> } \
> if (ufshcd_is_wb_flags(QUERY_FLAG_IDN##_uname)) \
> index = ufshcd_wb_get_query_index(hba); \
> - pm_runtime_get_sync(hba->dev); \
> + ufshcd_rpm_get_sync(hba); \
> ret = ufshcd_query_flag(hba, UPIU_QUERY_OPCODE_READ_FLAG, \
> QUERY_FLAG_IDN##_uname, index, &flag); \
> - pm_runtime_put_sync(hba->dev); \
> + ufshcd_rpm_put_sync(hba); \
> if (ret) { \
> ret = -EINVAL; \
> goto out; \
> @@ -813,10 +813,10 @@ static ssize_t _name##_show(struct device *dev, \
> } \
> if (ufshcd_is_wb_attrs(QUERY_ATTR_IDN##_uname)) \
> index = ufshcd_wb_get_query_index(hba); \
> - pm_runtime_get_sync(hba->dev); \
> + ufshcd_rpm_get_sync(hba); \
> ret = ufshcd_query_attr(hba, UPIU_QUERY_OPCODE_READ_ATTR, \
> QUERY_ATTR_IDN##_uname, index, 0, &value); \
> - pm_runtime_put_sync(hba->dev); \
> + ufshcd_rpm_put_sync(hba); \
> if (ret) { \
> ret = -EINVAL; \
> goto out; \
> @@ -964,10 +964,10 @@ static ssize_t dyn_cap_needed_attribute_show(struct device *dev,
> goto out;
> }
>
> - pm_runtime_get_sync(hba->dev);
> + ufshcd_rpm_get_sync(hba);
> ret = ufshcd_query_attr(hba, UPIU_QUERY_OPCODE_READ_ATTR,
> QUERY_ATTR_IDN_DYN_CAP_NEEDED, lun, 0, &value);
> - pm_runtime_put_sync(hba->dev);
> + ufshcd_rpm_put_sync(hba);
> if (ret) {
> ret = -EINVAL;
> goto out;
>
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [PATCH v18 1/2] scsi: ufs: Enable power management for wlun
2021-04-14 18:58 ` [PATCH v18 1/2] scsi: ufs: Enable power management for wlun Asutosh Das
2021-04-14 22:41 ` kernel test robot
@ 2021-04-15 11:06 ` Adrian Hunter
2021-04-15 18:22 ` Dan Carpenter
2021-04-15 23:11 ` Bart Van Assche
3 siblings, 0 replies; 10+ messages in thread
From: Adrian Hunter @ 2021-04-15 11:06 UTC (permalink / raw)
To: Asutosh Das, cang, martin.petersen, linux-scsi
Cc: linux-arm-msm, Alim Akhtar, Avri Altman, James E.J. Bottomley,
Krzysztof Kozlowski, Stanley Chu, Andy Gross, Bjorn Andersson,
Steven Rostedt, Ingo Molnar, Matthias Brugger, Lee Jones,
Bean Huo, Kiwoong Kim, Yue Hu, Wei Yongjun, Gustavo A. R. Silva,
Dinghao Liu, Jaegeuk Kim, Satya Tangirala, open list,
moderated list:ARM/SAMSUNG S3C, S5P AND EXYNOS ARM ARCHITECTURES,
open list:ARM/SAMSUNG S3C, S5P AND EXYNOS ARM ARCHITECTURES,
moderated list:UNIVERSAL FLASH STORAGE HOST CONTROLLER DRIVER...
On 14/04/21 9:58 pm, Asutosh Das wrote:
> During runtime-suspend of ufs host, the scsi devices are
> already suspended and so are the queues associated with them.
> But the ufs host sends SSU (START_STOP_UNIT) to wlun
> during its runtime-suspend.
> During the process blk_queue_enter checks if the queue is not in
> suspended state. If so, it waits for the queue to resume, and never
> comes out of it.
> The commit
> (d55d15a33: scsi: block: Do not accept any requests while suspended)
> adds the check if the queue is in suspended state in blk_queue_enter().
>
> Call trace:
> __switch_to+0x174/0x2c4
> __schedule+0x478/0x764
> schedule+0x9c/0xe0
> blk_queue_enter+0x158/0x228
> blk_mq_alloc_request+0x40/0xa4
> blk_get_request+0x2c/0x70
> __scsi_execute+0x60/0x1c4
> ufshcd_set_dev_pwr_mode+0x124/0x1e4
> ufshcd_suspend+0x208/0x83c
> ufshcd_runtime_suspend+0x40/0x154
> ufshcd_pltfrm_runtime_suspend+0x14/0x20
> pm_generic_runtime_suspend+0x28/0x3c
> __rpm_callback+0x80/0x2a4
> rpm_suspend+0x308/0x614
> rpm_idle+0x158/0x228
> pm_runtime_work+0x84/0xac
> process_one_work+0x1f0/0x470
> worker_thread+0x26c/0x4c8
> kthread+0x13c/0x320
> ret_from_fork+0x10/0x18
>
> Fix this by registering ufs device wlun as a scsi driver and
> registering it for block runtime-pm. Also make this as a
> supplier for all other luns. That way, this device wlun
> suspends after all the consumers and resumes after
> hba resumes.
Can you also explain the new driver for RPMB WLUN and UAC changes here?
And also mention that the driver will now always be runtime
resumed before system suspend.
>
> Co-developed-by: Can Guo <cang@codeaurora.org>
> Signed-off-by: Can Guo <cang@codeaurora.org>
> Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
> ---
<SNIP>
> +static void ufshcd_setup_links(struct ufs_hba *hba, struct scsi_device *sdev)
> +{
> + struct device_link *link;
> +
> + /*
> + * device wlun is the supplier & rest of the luns are consumers
> + * This ensures that device wlun suspends after all other luns.
> + */
> + if (hba->sdev_ufs_device) {
> + link = device_link_add(&sdev->sdev_gendev,
> + &hba->sdev_ufs_device->sdev_gendev,
> + DL_FLAG_PM_RUNTIME|DL_FLAG_RPM_ACTIVE);
"|" could be surrounded by spaces i.e.
DL_FLAG_PM_RUNTIME | DL_FLAG_RPM_ACTIVE);
> + if (!link) {
> + dev_err(&sdev->sdev_gendev, "Failed establishing link - %s\n",
> + dev_name(&hba->sdev_ufs_device->sdev_gendev));
> + return;
> + }
> + hba->luns_avail--;
> + /* Ignore REPORT_LUN wlun probing */
> + if (hba->luns_avail == 1) {
> + ufshcd_rpm_put(hba);
> + return;
> + }
> + } else {
> + /* device wlun is probed */
> + hba->luns_avail--;
> + }
> +}
<SNIP>
> @@ -8916,42 +8906,214 @@ static int ufshcd_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op)
> if (hba->ee_usr_mask)
> ufshcd_write_ee_control(hba);
>
> - hba->clk_gating.is_suspended = false;
> -
> - if (ufshcd_is_clkscaling_supported(hba))
> - ufshcd_clk_scaling_suspend(hba, false);
> -
> - /* Enable Auto-Hibernate if configured */
> - ufshcd_auto_hibern8_enable(hba);
> + if (hba->clk_scaling.is_allowed)
> + ufshcd_resume_clkscaling(hba);
We don't use clks, regulators, clk gating, clk scaling, but the
original code looks more correct because hba->clk_scaling.is_allowed
will have been set to false by ufshcd_clk_scaling_suspend(hba, true)
in __ufshcd_wl_suspend().
<SNIP>
> +#ifdef CONFIG_PM_SLEEP
> +static int ufshcd_wl_suspend(struct device *dev)
> +{
> + struct scsi_device *sdev = to_scsi_device(dev);
> + struct ufs_hba *hba;
> + int ret;
For below:
int ret = 0;
> + ktime_t start = ktime_get();
> +
> + hba = shost_priv(sdev->host);
> + down(&hba->host_sem);
If we get here with dev runtime suspended, then skip
__ufshcd_wl_suspend() i.e.
if (pm_runtime_suspended(dev))
goto out;
> + ret = __ufshcd_wl_suspend(hba, UFS_SYSTEM_PM);
> + if (ret) {
> + dev_err(&sdev->sdev_gendev, "%s failed: %d\n", __func__, ret);
> + up(&hba->host_sem);
> + } else {
> + hba->is_sys_suspended = true;
> + }
out:
if (!ret)
hba->is_sys_suspended = true;
> +
> + trace_ufshcd_wl_suspend(dev_name(dev), ret,
> + ktime_to_us(ktime_sub(ktime_get(), start)),
> + hba->curr_dev_pwr_mode, hba->uic_link_state);
> +
> + return ret;
> +}
<SNIP>
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [PATCH v18 1/2] scsi: ufs: Enable power management for wlun
2021-04-14 18:58 ` [PATCH v18 1/2] scsi: ufs: Enable power management for wlun Asutosh Das
2021-04-14 22:41 ` kernel test robot
2021-04-15 11:06 ` Adrian Hunter
@ 2021-04-15 18:22 ` Dan Carpenter
2021-04-15 23:11 ` Bart Van Assche
3 siblings, 0 replies; 10+ messages in thread
From: Dan Carpenter @ 2021-04-15 18:22 UTC (permalink / raw)
To: kbuild, Asutosh Das, cang, martin.petersen, adrian.hunter, linux-scsi
Cc: lkp, kbuild-all, Asutosh Das, linux-arm-msm, Alim Akhtar,
Avri Altman, James E.J. Bottomley, Pedro Sousa
[-- Attachment #1: Type: text/plain, Size: 6601 bytes --]
Hi Asutosh,
url: https://github.com/0day-ci/linux/commits/Asutosh-Das/Enable-power-management-for-ufs-wlun/20210415-030146
base: https://git.kernel.org/pub/scm/linux/kernel/git/mkp/scsi.git for-next
config: i386-randconfig-m021-20210415 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
New smatch warnings:
drivers/scsi/ufs/ufshcd.c:9017 ufshcd_wl_resume() error: potentially dereferencing uninitialized 'hba'.
drivers/scsi/ufs/ufshcd.c:9141 ufshcd_system_suspend() error: uninitialized symbol 'ret'.
drivers/scsi/ufs/ufshcd.c:9166 ufshcd_system_resume() error: uninitialized symbol 'ret'.
Old smatch warnings:
drivers/scsi/ufs/ufshcd.c:5112 ufshcd_uic_cmd_compl() error: we previously assumed 'hba->active_uic_cmd' could be null (see line 5100)
vim +/hba +9017 drivers/scsi/ufs/ufshcd.c
9bad6c1c707d2a Asutosh Das 2021-04-14 8998
9bad6c1c707d2a Asutosh Das 2021-04-14 8999 static int ufshcd_wl_resume(struct device *dev)
9bad6c1c707d2a Asutosh Das 2021-04-14 9000 {
9bad6c1c707d2a Asutosh Das 2021-04-14 9001 struct scsi_device *sdev = to_scsi_device(dev);
9bad6c1c707d2a Asutosh Das 2021-04-14 9002 struct ufs_hba *hba;
^^^
9bad6c1c707d2a Asutosh Das 2021-04-14 9003 int ret = 0;
9bad6c1c707d2a Asutosh Das 2021-04-14 9004 ktime_t start = ktime_get();
9bad6c1c707d2a Asutosh Das 2021-04-14 9005
9bad6c1c707d2a Asutosh Das 2021-04-14 9006 if (pm_runtime_suspended(dev))
9bad6c1c707d2a Asutosh Das 2021-04-14 9007 goto out;
^^^^^^^^
9bad6c1c707d2a Asutosh Das 2021-04-14 9008
9bad6c1c707d2a Asutosh Das 2021-04-14 9009 hba = shost_priv(sdev->host);
9bad6c1c707d2a Asutosh Das 2021-04-14 9010
9bad6c1c707d2a Asutosh Das 2021-04-14 9011 ret = __ufshcd_wl_resume(hba, UFS_SYSTEM_PM);
9bad6c1c707d2a Asutosh Das 2021-04-14 9012 if (ret)
9bad6c1c707d2a Asutosh Das 2021-04-14 9013 dev_err(&sdev->sdev_gendev, "%s failed: %d\n", __func__, ret);
9bad6c1c707d2a Asutosh Das 2021-04-14 9014 out:
9bad6c1c707d2a Asutosh Das 2021-04-14 9015 trace_ufshcd_wl_resume(dev_name(dev), ret,
9bad6c1c707d2a Asutosh Das 2021-04-14 9016 ktime_to_us(ktime_sub(ktime_get(), start)),
9bad6c1c707d2a Asutosh Das 2021-04-14 @9017 hba->curr_dev_pwr_mode, hba->uic_link_state);
^^^^^^^^^^^^^^^^^^^^^^
Uninitialized.
9bad6c1c707d2a Asutosh Das 2021-04-14 9018 if (!ret)
9bad6c1c707d2a Asutosh Das 2021-04-14 9019 hba->is_sys_suspended = false;
9bad6c1c707d2a Asutosh Das 2021-04-14 9020 up(&hba->host_sem);
9bad6c1c707d2a Asutosh Das 2021-04-14 9021 return ret;
9bad6c1c707d2a Asutosh Das 2021-04-14 9022 }
[ snip ]
57d104c153d3d6 Subhash Jadavani 2014-09-25 9131 int ufshcd_system_suspend(struct ufs_hba *hba)
7a3e97b0dc4bba Santosh Yaraganavi 2012-02-29 9132 {
9bad6c1c707d2a Asutosh Das 2021-04-14 9133 int ret;
7ff5ab47363334 Subhash Jadavani 2016-12-22 9134 ktime_t start = ktime_get();
57d104c153d3d6 Subhash Jadavani 2014-09-25 9135
9bad6c1c707d2a Asutosh Das 2021-04-14 9136 if (pm_runtime_suspended(hba->dev))
57d104c153d3d6 Subhash Jadavani 2014-09-25 9137 goto out;
^^^^^^^^
3b1d05807a9a68 Vinayak Holikatti 2013-02-25 9138
9bad6c1c707d2a Asutosh Das 2021-04-14 9139 ret = ufshcd_suspend(hba);
57d104c153d3d6 Subhash Jadavani 2014-09-25 9140 out:
7ff5ab47363334 Subhash Jadavani 2016-12-22 @9141 trace_ufshcd_system_suspend(dev_name(hba->dev), ret,
^^^
"ret" uninitialized.
7ff5ab47363334 Subhash Jadavani 2016-12-22 9142 ktime_to_us(ktime_sub(ktime_get(), start)),
73eba2be9203c0 Subhash Jadavani 2017-01-10 9143 hba->curr_dev_pwr_mode, hba->uic_link_state);
57d104c153d3d6 Subhash Jadavani 2014-09-25 9144 return ret;
57d104c153d3d6 Subhash Jadavani 2014-09-25 9145 }
57d104c153d3d6 Subhash Jadavani 2014-09-25 9146 EXPORT_SYMBOL(ufshcd_system_suspend);
57d104c153d3d6 Subhash Jadavani 2014-09-25 9147
57d104c153d3d6 Subhash Jadavani 2014-09-25 9148 /**
57d104c153d3d6 Subhash Jadavani 2014-09-25 9149 * ufshcd_system_resume - system resume routine
57d104c153d3d6 Subhash Jadavani 2014-09-25 9150 * @hba: per adapter instance
57d104c153d3d6 Subhash Jadavani 2014-09-25 9151 *
57d104c153d3d6 Subhash Jadavani 2014-09-25 9152 * Returns 0 for success and non-zero for failure
57d104c153d3d6 Subhash Jadavani 2014-09-25 9153 */
57d104c153d3d6 Subhash Jadavani 2014-09-25 9154
57d104c153d3d6 Subhash Jadavani 2014-09-25 9155 int ufshcd_system_resume(struct ufs_hba *hba)
66ec6d59407baf Sujit Reddy Thumma 2013-07-30 9156 {
9bad6c1c707d2a Asutosh Das 2021-04-14 9157 int ret;
7ff5ab47363334 Subhash Jadavani 2016-12-22 9158 ktime_t start = ktime_get();
7ff5ab47363334 Subhash Jadavani 2016-12-22 9159
9bad6c1c707d2a Asutosh Das 2021-04-14 9160 if (pm_runtime_suspended(hba->dev))
7ff5ab47363334 Subhash Jadavani 2016-12-22 9161 goto out;
9bad6c1c707d2a Asutosh Das 2021-04-14 9162
9bad6c1c707d2a Asutosh Das 2021-04-14 9163 ret = ufshcd_resume(hba);
9bad6c1c707d2a Asutosh Das 2021-04-14 9164
7ff5ab47363334 Subhash Jadavani 2016-12-22 9165 out:
7ff5ab47363334 Subhash Jadavani 2016-12-22 @9166 trace_ufshcd_system_resume(dev_name(hba->dev), ret,
^^^
ret uninitialized
7ff5ab47363334 Subhash Jadavani 2016-12-22 9167 ktime_to_us(ktime_sub(ktime_get(), start)),
73eba2be9203c0 Subhash Jadavani 2017-01-10 9168 hba->curr_dev_pwr_mode, hba->uic_link_state);
9bad6c1c707d2a Asutosh Das 2021-04-14 9169
7ff5ab47363334 Subhash Jadavani 2016-12-22 9170 return ret;
57d104c153d3d6 Subhash Jadavani 2014-09-25 9171 }
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
[-- Attachment #2: .config.gz --]
[-- Type: application/gzip, Size: 39334 bytes --]
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [PATCH v18 1/2] scsi: ufs: Enable power management for wlun
2021-04-14 18:58 ` [PATCH v18 1/2] scsi: ufs: Enable power management for wlun Asutosh Das
` (2 preceding siblings ...)
2021-04-15 18:22 ` Dan Carpenter
@ 2021-04-15 23:11 ` Bart Van Assche
2021-04-16 2:10 ` Martin K. Petersen
2021-04-16 18:21 ` Asutosh Das (asd)
3 siblings, 2 replies; 10+ messages in thread
From: Bart Van Assche @ 2021-04-15 23:11 UTC (permalink / raw)
To: Asutosh Das, cang, martin.petersen, adrian.hunter, linux-scsi
Cc: linux-arm-msm, Alim Akhtar, Avri Altman, James E.J. Bottomley,
Pedro Sousa, Krzysztof Kozlowski, Stanley Chu, Andy Gross,
Bjorn Andersson, Steven Rostedt, Ingo Molnar, Matthias Brugger,
Lee Jones, Bean Huo, Kiwoong Kim, Yue Hu, Wei Yongjun,
Gustavo A. R. Silva, Dinghao Liu, Jaegeuk Kim, Satya Tangirala,
open list, moderated list:ARM/SAMSUNG S3C,
S5P AND EXYNOS ARM ARCHITECTURES, open list:ARM/SAMSUNG S3C,
S5P AND EXYNOS ARM ARCHITECTURES,
moderated list:UNIVERSAL FLASH STORAGE HOST CONTROLLER DRIVER...
On 4/14/21 11:58 AM, Asutosh Das wrote:
> [ ... ]
Patches sent to the SCSI mailing list should not have a "scsi: " prefix
in the subject. That prefix is inserted before any SCSI patches go into
Martin's tree.
> diff --git a/drivers/scsi/ufs/cdns-pltfrm.c b/drivers/scsi/ufs/cdns-pltfrm.c
> index 13d9204..b9105e4 100644
> --- a/drivers/scsi/ufs/cdns-pltfrm.c
> +++ b/drivers/scsi/ufs/cdns-pltfrm.c
> @@ -323,6 +323,8 @@ static const struct dev_pm_ops cdns_ufs_dev_pm_ops = {
> .runtime_suspend = ufshcd_pltfrm_runtime_suspend,
> .runtime_resume = ufshcd_pltfrm_runtime_resume,
> .runtime_idle = ufshcd_pltfrm_runtime_idle,
> + .prepare = ufshcd_suspend_prepare,
> + .complete = ufshcd_resume_complete,
> };
>
> static struct platform_driver cdns_ufs_pltfrm_driver = {
> diff --git a/drivers/scsi/ufs/tc-dwc-g210-pci.c b/drivers/scsi/ufs/tc-dwc-g210-pci.c
> index 67a6a61..b01db12 100644
> --- a/drivers/scsi/ufs/tc-dwc-g210-pci.c
> +++ b/drivers/scsi/ufs/tc-dwc-g210-pci.c
> @@ -148,6 +148,8 @@ static const struct dev_pm_ops tc_dwc_g210_pci_pm_ops = {
> .runtime_suspend = tc_dwc_g210_pci_runtime_suspend,
> .runtime_resume = tc_dwc_g210_pci_runtime_resume,
> .runtime_idle = tc_dwc_g210_pci_runtime_idle,
> + .prepare = ufshcd_suspend_prepare,
> + .complete = ufshcd_resume_complete,
> };
[ ... ]
> --- a/drivers/scsi/ufs/ufs-exynos.c
> +++ b/drivers/scsi/ufs/ufs-exynos.c
> @@ -1267,6 +1267,8 @@ static const struct dev_pm_ops exynos_ufs_pm_ops = {
> .runtime_suspend = ufshcd_pltfrm_runtime_suspend,
> .runtime_resume = ufshcd_pltfrm_runtime_resume,
> .runtime_idle = ufshcd_pltfrm_runtime_idle,
> + .prepare = ufshcd_suspend_prepare,
> + .complete = ufshcd_resume_complete,
> };
>
> static struct platform_driver exynos_ufs_pltform = {
> diff --git a/drivers/scsi/ufs/ufs-hisi.c b/drivers/scsi/ufs/ufs-hisi.c
> index 0aa5813..d463b44 100644
> --- a/drivers/scsi/ufs/ufs-hisi.c
> +++ b/drivers/scsi/ufs/ufs-hisi.c
> @@ -574,6 +574,8 @@ static const struct dev_pm_ops ufs_hisi_pm_ops = {
> .runtime_suspend = ufshcd_pltfrm_runtime_suspend,
> .runtime_resume = ufshcd_pltfrm_runtime_resume,
> .runtime_idle = ufshcd_pltfrm_runtime_idle,
> + .prepare = ufshcd_suspend_prepare,
> + .complete = ufshcd_resume_complete,
> };
A minor comment about source code formatting: please make sure that the
equality signs are aligned in struct dev_pm_ops definitions.
> +static inline bool is_rpmb_wlun(struct scsi_device *sdev)
> +{
> + return (sdev->lun == ufshcd_upiu_wlun_to_scsi_wlun(UFS_UPIU_RPMB_WLUN));
> +}
> +
> +static inline bool is_device_wlun(struct scsi_device *sdev)
> +{
> + return (sdev->lun ==
> + ufshcd_upiu_wlun_to_scsi_wlun(UFS_UPIU_UFS_DEVICE_WLUN));
> +}
The Linux kernel coding style requires not to surround expressions with
parentheses in return statements.
> /**
> + * ufshcd_setup_links - associate link b/w device wlun and other luns
> + * @sdev: pointer to SCSI device
> + * @hba: pointer to ufs hba
> + */
> +static void ufshcd_setup_links(struct ufs_hba *hba, struct scsi_device *sdev)
> +{
> + struct device_link *link;
> +
> + /*
> + * device wlun is the supplier & rest of the luns are consumers
> + * This ensures that device wlun suspends after all other luns.
> + */
> + if (hba->sdev_ufs_device) {
> + link = device_link_add(&sdev->sdev_gendev,
> + &hba->sdev_ufs_device->sdev_gendev,
> + DL_FLAG_PM_RUNTIME|DL_FLAG_RPM_ACTIVE);
> + if (!link) {
> + dev_err(&sdev->sdev_gendev, "Failed establishing link - %s\n",
> + dev_name(&hba->sdev_ufs_device->sdev_gendev));
> + return;
> + }
> + hba->luns_avail--;
> + /* Ignore REPORT_LUN wlun probing */
> + if (hba->luns_avail == 1) {
> + ufshcd_rpm_put(hba);
> + return;
> + }
> + } else {
> + /* device wlun is probed */
> + hba->luns_avail--;
> + }
> +}
Please add a comment that explains that it is assumed that the WLUNs are
scanned before the other LUNs.
> @@ -4862,8 +4913,13 @@ static int ufshcd_slave_configure(struct scsi_device *sdev)
> blk_queue_update_dma_pad(q, PRDT_DATA_BYTE_COUNT_PAD - 1);
> if (hba->quirks & UFSHCD_QUIRK_ALIGN_SG_WITH_PAGE_SIZE)
> blk_queue_update_dma_alignment(q, PAGE_SIZE - 1);
> -
> - if (ufshcd_is_rpm_autosuspend_allowed(hba))
> + /*
> + * Block runtime-pm until all consumers are added.
> + * Refer ufshcd_setup_links().
> + */
> + if (is_device_wlun(sdev))
> + pm_runtime_get_noresume(&sdev->sdev_gendev);
> + else if (ufshcd_is_rpm_autosuspend_allowed(hba))
> sdev->rpm_autosuspend = 1;
>
> ufshcd_crypto_setup_rq_keyslot_manager(hba, q);
The following code is executed before ufshcd_async_scan() is called:
dev = hba->dev;
[ ... ]
/* Hold auto suspend until async scan completes */
pm_runtime_get_sync(dev);
and the following code occurs in ufshcd_add_lus():
pm_runtime_put_sync(hba->dev);
Isn't that sufficient to postpone enabling of runtime PM until LUN
scanning has finished? Or in other words, is adding a
pm_runtime_get_noresume() call in ufshcd_slave_configure() really necessary?
> @@ -4979,15 +5035,9 @@ ufshcd_transfer_rsp_status(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
> */
> if (!hba->pm_op_in_progress &&
> !ufshcd_eh_in_progress(hba) &&
> - ufshcd_is_exception_event(lrbp->ucd_rsp_ptr) &&
> - schedule_work(&hba->eeh_work)) {
> - /*
> - * Prevent suspend once eeh_work is scheduled
> - * to avoid deadlock between ufshcd_suspend
> - * and exception event handler.
> - */
> - pm_runtime_get_noresume(hba->dev);
> - }
> + ufshcd_is_exception_event(lrbp->ucd_rsp_ptr))
> + /* Flushed in suspend */
> + schedule_work(&hba->eeh_work);
What makes it safe to leave out the above pm_runtime_get_noresume() call?
Thanks,
Bart.
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [PATCH v18 1/2] scsi: ufs: Enable power management for wlun
2021-04-15 23:11 ` Bart Van Assche
@ 2021-04-16 2:10 ` Martin K. Petersen
2021-04-16 18:21 ` Asutosh Das (asd)
1 sibling, 0 replies; 10+ messages in thread
From: Martin K. Petersen @ 2021-04-16 2:10 UTC (permalink / raw)
To: Bart Van Assche
Cc: Asutosh Das, cang, martin.petersen, adrian.hunter, linux-scsi,
linux-arm-msm, Alim Akhtar, Avri Altman, James E.J. Bottomley,
Pedro Sousa, Krzysztof Kozlowski, Stanley Chu, Andy Gross,
Bjorn Andersson, Steven Rostedt, Ingo Molnar, Matthias Brugger,
Lee Jones, Bean Huo, Kiwoong Kim, Yue Hu, Wei Yongjun,
Gustavo A. R. Silva, Dinghao Liu, Jaegeuk Kim, Satya Tangirala,
open list, moderated list:ARM/SAMSUNG S3C,
S5P AND EXYNOS ARM ARCHITECTURES, open list:ARM/SAMSUNG S3C,
S5P AND EXYNOS ARM ARCHITECTURES,
moderated list:UNIVERSAL FLASH STORAGE HOST CONTROLLER DRIVER...
Hi Bart!
> Patches sent to the SCSI mailing list should not have a "scsi: " prefix
> in the subject. That prefix is inserted before any SCSI patches go into
> Martin's tree.
This doesn't actually matter. My script will add the prefix if it's not
present.
--
Martin K. Petersen Oracle Linux Engineering
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [PATCH v18 1/2] scsi: ufs: Enable power management for wlun
2021-04-15 23:11 ` Bart Van Assche
2021-04-16 2:10 ` Martin K. Petersen
@ 2021-04-16 18:21 ` Asutosh Das (asd)
1 sibling, 0 replies; 10+ messages in thread
From: Asutosh Das (asd) @ 2021-04-16 18:21 UTC (permalink / raw)
To: Bart Van Assche, cang, martin.petersen, adrian.hunter, linux-scsi
Cc: linux-arm-msm, Alim Akhtar, Avri Altman, James E.J. Bottomley,
Pedro Sousa, Krzysztof Kozlowski, Stanley Chu, Andy Gross,
Bjorn Andersson, Steven Rostedt, Ingo Molnar, Matthias Brugger,
Lee Jones, Bean Huo, Kiwoong Kim, Yue Hu, Wei Yongjun,
Gustavo A. R. Silva, Dinghao Liu, Jaegeuk Kim, Satya Tangirala,
open list, moderated list:ARM/SAMSUNG S3C,
S5P AND EXYNOS ARM ARCHITECTURES, open list:ARM/SAMSUNG S3C,
S5P AND EXYNOS ARM ARCHITECTURES,
moderated list:UNIVERSAL FLASH STORAGE HOST CONTROLLER DRIVER...
On 4/15/2021 4:11 PM, Bart Van Assche wrote:
> On 4/14/21 11:58 AM, Asutosh Das wrote:
>> [ ... ]
>
Hi Bart,
Thanks for the comments. I will fix the comments in the next version.
> The following code is executed before ufshcd_async_scan() is called:
>
> dev = hba->dev;
> [ ... ]
> /* Hold auto suspend until async scan completes */
> pm_runtime_get_sync(dev);
>
That would only keep the hba runtime resumed. At this point of time the
luns are not detected yet.
> and the following code occurs in ufshcd_add_lus():
>
> pm_runtime_put_sync(hba->dev);
>
> Isn't that sufficient to postpone enabling of runtime PM until LUN
> scanning has finished? Or in other words, is adding a
> pm_runtime_get_noresume() call in ufshcd_slave_configure() really necessary?
>
Yes, because the supplier (device wlun) may be suspended otherwise in
scsi_sysfs_add_sdev().
>> @@ -4979,15 +5035,9 @@ ufshcd_transfer_rsp_status(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
>> */
>> if (!hba->pm_op_in_progress &&
>> !ufshcd_eh_in_progress(hba) &&
>> - ufshcd_is_exception_event(lrbp->ucd_rsp_ptr) &&
>> - schedule_work(&hba->eeh_work)) {
>> - /*
>> - * Prevent suspend once eeh_work is scheduled
>> - * to avoid deadlock between ufshcd_suspend
>> - * and exception event handler.
>> - */
>> - pm_runtime_get_noresume(hba->dev);
>> - }
>> + ufshcd_is_exception_event(lrbp->ucd_rsp_ptr))
>> + /* Flushed in suspend */
>> + schedule_work(&hba->eeh_work);
>
> What makes it safe to leave out the above pm_runtime_get_noresume() call?
>
The __ufshcd_wl_suspend() would flush this work so that it doesn't run
after suspend.
> Thanks,
>
> Bart.
>
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
Linux Foundation Collaborative Project
^ permalink raw reply [flat|nested] 10+ messages in thread
end of thread, other threads:[~2021-04-16 18:22 UTC | newest]
Thread overview: 10+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-04-14 18:58 [PATCH v18 0/2] Enable power management for ufs wlun Asutosh Das
2021-04-14 18:58 ` [PATCH v18 1/2] scsi: ufs: Enable power management for wlun Asutosh Das
2021-04-14 22:41 ` kernel test robot
2021-04-15 11:06 ` Adrian Hunter
2021-04-15 18:22 ` Dan Carpenter
2021-04-15 23:11 ` Bart Van Assche
2021-04-16 2:10 ` Martin K. Petersen
2021-04-16 18:21 ` Asutosh Das (asd)
2021-04-14 18:58 ` [PATCH v18 2/2] ufs: sysfs: Resume the proper scsi device Asutosh Das
2021-04-15 9:21 ` Adrian Hunter
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