[PATCH v2 03/18] scsi: hisi_sas: use wait_for_completion_timeout() when clearing ITCT
From: John Garry
Date: Thu Oct 24 2019 - 10:11:41 EST
From: Xiang Chen <chenxiang66@xxxxxxxxxxxxx>
When injecting 2bit ecc errors, it will cause confusion inside SAS
controller which needs host reset to recover it. If a device is gone at
the same times inject 2bit ecc errors, we may not receive the ITCT
interrupt so it will wait for completion in clear_itct_v3_hw() all the
time. And host reset will also not occur because it can't require
hisi_hba->sem, so the system will be suspended.
To solve the issue, use wait_for_completion_timeout() instead of
wait_for_completion(), and also don't mark the gone device as
SAS_PHY_UNUSED when device gone.
Signed-off-by: Xiang Chen <chenxiang66@xxxxxxxxxxxxx>
Signed-off-by: John Garry <john.garry@xxxxxxxxxx>
---
drivers/scsi/hisi_sas/hisi_sas.h | 5 +++--
drivers/scsi/hisi_sas/hisi_sas_main.c | 8 ++++++--
drivers/scsi/hisi_sas/hisi_sas_v1_hw.c | 6 ++++--
drivers/scsi/hisi_sas/hisi_sas_v2_hw.c | 13 ++++++++++---
drivers/scsi/hisi_sas/hisi_sas_v3_hw.c | 13 ++++++++++---
5 files changed, 33 insertions(+), 12 deletions(-)
diff --git a/drivers/scsi/hisi_sas/hisi_sas.h b/drivers/scsi/hisi_sas/hisi_sas.h
index 720c4d6be939..83232e8472fb 100644
--- a/drivers/scsi/hisi_sas/hisi_sas.h
+++ b/drivers/scsi/hisi_sas/hisi_sas.h
@@ -84,6 +84,7 @@
#define HISI_SAS_PROT_MASK (HISI_SAS_DIF_PROT_MASK | HISI_SAS_DIX_PROT_MASK)
#define HISI_SAS_WAIT_PHYUP_TIMEOUT 20
+#define CLEAR_ITCT_TIMEOUT 20
struct hisi_hba;
@@ -296,8 +297,8 @@ struct hisi_sas_hw {
void (*phy_set_linkrate)(struct hisi_hba *hisi_hba, int phy_no,
struct sas_phy_linkrates *linkrates);
enum sas_linkrate (*phy_get_max_linkrate)(void);
- void (*clear_itct)(struct hisi_hba *hisi_hba,
- struct hisi_sas_device *dev);
+ int (*clear_itct)(struct hisi_hba *hisi_hba,
+ struct hisi_sas_device *dev);
void (*free_device)(struct hisi_sas_device *sas_dev);
int (*get_wideport_bitmap)(struct hisi_hba *hisi_hba, int port_id);
void (*dereg_device)(struct hisi_hba *hisi_hba,
diff --git a/drivers/scsi/hisi_sas/hisi_sas_main.c b/drivers/scsi/hisi_sas/hisi_sas_main.c
index ceba1016b77f..621eebbeacd6 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_main.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_main.c
@@ -1045,6 +1045,7 @@ static void hisi_sas_dev_gone(struct domain_device *device)
struct hisi_sas_device *sas_dev = device->lldd_dev;
struct hisi_hba *hisi_hba = dev_to_hisi_hba(device);
struct device *dev = hisi_hba->dev;
+ int ret = 0;
dev_info(dev, "dev[%d:%x] is gone\n",
sas_dev->device_id, sas_dev->dev_type);
@@ -1056,13 +1057,16 @@ static void hisi_sas_dev_gone(struct domain_device *device)
hisi_sas_dereg_device(hisi_hba, device);
- hisi_hba->hw->clear_itct(hisi_hba, sas_dev);
+ ret = hisi_hba->hw->clear_itct(hisi_hba, sas_dev);
device->lldd_dev = NULL;
}
if (hisi_hba->hw->free_device)
hisi_hba->hw->free_device(sas_dev);
- sas_dev->dev_type = SAS_PHY_UNUSED;
+
+ /* Don't mark it as SAS_PHY_UNUSED if failed to clear ITCT */
+ if (!ret)
+ sas_dev->dev_type = SAS_PHY_UNUSED;
sas_dev->sas_device = NULL;
up(&hisi_hba->sem);
}
diff --git a/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c
index b861a0f14c9d..3af53cc42bd6 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c
@@ -531,8 +531,8 @@ static void setup_itct_v1_hw(struct hisi_hba *hisi_hba,
(0xff00ULL << ITCT_HDR_REJ_OPEN_TL_OFF));
}
-static void clear_itct_v1_hw(struct hisi_hba *hisi_hba,
- struct hisi_sas_device *sas_dev)
+static int clear_itct_v1_hw(struct hisi_hba *hisi_hba,
+ struct hisi_sas_device *sas_dev)
{
u64 dev_id = sas_dev->device_id;
struct hisi_sas_itct *itct = &hisi_hba->itct[dev_id];
@@ -551,6 +551,8 @@ static void clear_itct_v1_hw(struct hisi_hba *hisi_hba,
qw0 = le64_to_cpu(itct->qw0);
qw0 &= ~ITCT_HDR_VALID_MSK;
itct->qw0 = cpu_to_le64(qw0);
+
+ return 0;
}
static int reset_hw_v1_hw(struct hisi_hba *hisi_hba)
diff --git a/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
index 8e96a257e439..61b1e2693b08 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
@@ -974,13 +974,14 @@ static void setup_itct_v2_hw(struct hisi_hba *hisi_hba,
(0x1ULL << ITCT_HDR_RTOLT_OFF));
}
-static void clear_itct_v2_hw(struct hisi_hba *hisi_hba,
- struct hisi_sas_device *sas_dev)
+static int clear_itct_v2_hw(struct hisi_hba *hisi_hba,
+ struct hisi_sas_device *sas_dev)
{
DECLARE_COMPLETION_ONSTACK(completion);
u64 dev_id = sas_dev->device_id;
struct hisi_sas_itct *itct = &hisi_hba->itct[dev_id];
u32 reg_val = hisi_sas_read32(hisi_hba, ENT_INT_SRC3);
+ struct device *dev = hisi_hba->dev;
int i;
sas_dev->completion = &completion;
@@ -990,13 +991,19 @@ static void clear_itct_v2_hw(struct hisi_hba *hisi_hba,
hisi_sas_write32(hisi_hba, ENT_INT_SRC3,
ENT_INT_SRC3_ITC_INT_MSK);
+ /* need to set register twice to clear ITCT for v2 hw */
for (i = 0; i < 2; i++) {
reg_val = ITCT_CLR_EN_MSK | (dev_id & ITCT_DEV_MSK);
hisi_sas_write32(hisi_hba, ITCT_CLR, reg_val);
- wait_for_completion(sas_dev->completion);
+ if (!wait_for_completion_timeout(sas_dev->completion,
+ CLEAR_ITCT_TIMEOUT * HZ)) {
+ dev_warn(dev, "failed to clear ITCT\n");
+ return -ETIMEDOUT;
+ }
memset(itct, 0, sizeof(struct hisi_sas_itct));
}
+ return 0;
}
static void free_device_v2_hw(struct hisi_sas_device *sas_dev)
diff --git a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
index cc594937fa8d..19a8cfeb8f6e 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
@@ -795,13 +795,14 @@ static void setup_itct_v3_hw(struct hisi_hba *hisi_hba,
(0x1ULL << ITCT_HDR_RTOLT_OFF));
}
-static void clear_itct_v3_hw(struct hisi_hba *hisi_hba,
- struct hisi_sas_device *sas_dev)
+static int clear_itct_v3_hw(struct hisi_hba *hisi_hba,
+ struct hisi_sas_device *sas_dev)
{
DECLARE_COMPLETION_ONSTACK(completion);
u64 dev_id = sas_dev->device_id;
struct hisi_sas_itct *itct = &hisi_hba->itct[dev_id];
u32 reg_val = hisi_sas_read32(hisi_hba, ENT_INT_SRC3);
+ struct device *dev = hisi_hba->dev;
sas_dev->completion = &completion;
@@ -814,8 +815,14 @@ static void clear_itct_v3_hw(struct hisi_hba *hisi_hba,
reg_val = ITCT_CLR_EN_MSK | (dev_id & ITCT_DEV_MSK);
hisi_sas_write32(hisi_hba, ITCT_CLR, reg_val);
- wait_for_completion(sas_dev->completion);
+ if (!wait_for_completion_timeout(sas_dev->completion,
+ CLEAR_ITCT_TIMEOUT * HZ)) {
+ dev_warn(dev, "failed to clear ITCT\n");
+ return -ETIMEDOUT;
+ }
+
memset(itct, 0, sizeof(struct hisi_sas_itct));
+ return 0;
}
static void dereg_device_v3_hw(struct hisi_hba *hisi_hba,
--
2.17.1