[PATCH v1 2/3] scsi: ufs: add error handling of auto-hibern8

Stanley Chu
2019-05-13T14:36:25Z

Currently auto-hibern8 is activated if host supports
auto-hibern8 capability. However no error handlings are existed thus
this feature is kind of risky.

If "Hibernate Enter" or "Hibernate Exit" fail happens
during auto-hibern8 flow, the corresponding interrupt
"UIC_HIBERNATE_ENTER" or "UIC_HIBERNATE_EXIT" shall be raised
according to UFS specification.

This patch adds auto-hibern8 error handlings:

- Monitor "Hibernate Enter" and "Hibernate Exit" interrupts after
auto-hibern8 feature is activated.
- If fail happens, trigger error handlings just like "manual-hibernate"
fail and use the same flow: Identify errors and schedule UFS error
handler in ufshcd_check_errors(), and then do host reset and restore
in UFS error handler.

Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>
---
drivers/scsi/ufs/ufshcd.c | 14 ++++++++++++++
drivers/scsi/ufs/ufshcd.h | 13 +++++++++++++
drivers/scsi/ufs/ufshci.h | 3 +++
3 files changed, 30 insertions(+)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 1665820c22fd..e0e3930abc19 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -5254,6 +5254,7 @@ static void ufshcd_err_handler(struct work_struct *work)
goto skip_err_handling;
}
if ((hba->saved_err & INT_FATAL_ERRORS) ||
+ ufshcd_is_auto_hibern8_error(hba, hba->saved_err) ||
((hba->saved_err & UIC_ERROR) &&
(hba->saved_uic_err & (UFSHCD_UIC_DL_PA_INIT_ERROR |
UFSHCD_UIC_DL_NAC_RECEIVED_ERROR |
@@ -5431,6 +5432,15 @@ static void ufshcd_check_errors(struct ufs_hba *hba)
queue_eh_work = true;
}

+ if (ufshcd_is_auto_hibern8_error(hba, hba->errors)) {
+ dev_err(hba->dev,
+ "%s: Auto Hibern8 %s failed - status: 0x%08x, upmcrs: 0x%08x\n",
+ __func__, (hba->errors & UIC_HIBERNATE_ENTER) ?
+ "Enter" : "Exit",
+ hba->errors, ufshcd_get_upmcrs(hba));
+ queue_eh_work = true;
+ }
+
if (queue_eh_work) {
/*
* update the transfer error masks to sticky bits, let's do this
@@ -5493,6 +5503,10 @@ static void ufshcd_tmc_handler(struct ufs_hba *hba)
static void ufshcd_sl_intr(struct ufs_hba *hba, u32 intr_status)
{
hba->errors = UFSHCD_ERROR_MASK & intr_status;
+
+ if (ufshcd_is_auto_hibern8_error(hba, intr_status))
+ hba->errors |= (UFSHCD_UIC_AH8_ERROR_MASK & intr_status);
+
if (hba->errors)
ufshcd_check_errors(hba);

diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
index ecfa898b9ccc..1bd9c8b61ed2 100644
--- a/drivers/scsi/ufs/ufshcd.h
+++ b/drivers/scsi/ufs/ufshcd.h
@@ -740,6 +740,19 @@ return true;
#endif
}

+static inline bool ufshcd_is_auto_hibern8_supported(struct ufs_hba *hba)
+{
+ return (hba->capabilities & MASK_AUTO_HIBERN8_SUPPORT);
+}
+
+static inline bool ufshcd_is_auto_hibern8_error(struct ufs_hba *hba,
+ u32 intr_mask)
+{
+ return (ufshcd_is_auto_hibern8_supported(hba) &&
+ !hba->uic_async_done &&
+ (intr_mask & UFSHCD_UIC_AH8_ERROR_MASK));
+}
+
#define ufshcd_writel(hba, val, reg) \
writel((val), (hba)->mmio_base + (reg))
#define ufshcd_readl(hba, reg) \
diff --git a/drivers/scsi/ufs/ufshci.h b/drivers/scsi/ufs/ufshci.h
index 6fa889de5ee5..4bcb205f2077 100644
--- a/drivers/scsi/ufs/ufshci.h
+++ b/drivers/scsi/ufs/ufshci.h
@@ -148,6 +148,9 @@ enum {
UIC_HIBERNATE_EXIT |\
UIC_POWER_MODE)

+#define UFSHCD_UIC_AH8_ERROR_MASK (UIC_HIBERNATE_ENTER |\
+ UIC_HIBERNATE_EXIT)
+
#define UFSHCD_UIC_MASK (UIC_COMMAND_COMPL | UFSHCD_UIC_PWR_MASK)

#define UFSHCD_ERROR_MASK (UIC_ERROR |\
--
2.18.0