[PATCH 5.4 051/168] scsi: smartpqi: fix controller lockup observed during force reboot

From: Greg Kroah-Hartman
Date: Tue Apr 28 2020 - 14:37:47 EST

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From: Kevin Barnett <kevin.barnett@xxxxxxxxxxxxx>

[ Upstream commit 0530736e40a0695b1ee2762e2684d00549699da4 ]

Link: https://lore.kernel.org/r/157048748297.11757.3872221216800537383.stgit@brunhilda
Reviewed-by: Scott Benesh <scott.benesh@xxxxxxxxxxxxx>
Reviewed-by: Scott Teel <scott.teel@xxxxxxxxxxxxx>
Signed-off-by: Kevin Barnett <kevin.barnett@xxxxxxxxxxxxx>
Signed-off-by: Don Brace <don.brace@xxxxxxxxxxxxx>
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/scsi/smartpqi/smartpqi.h | 9 +-
drivers/scsi/smartpqi/smartpqi_init.c | 126 ++++++++++++++++++++++----
2 files changed, 115 insertions(+), 20 deletions(-)

diff --git a/drivers/scsi/smartpqi/smartpqi.h b/drivers/scsi/smartpqi/smartpqi.h
index 79d2af36f6552..2aa81b22f2695 100644
--- a/drivers/scsi/smartpqi/smartpqi.h
+++ b/drivers/scsi/smartpqi/smartpqi.h
@@ -1130,8 +1130,9 @@ struct pqi_ctrl_info {
struct mutex ofa_mutex; /* serialize ofa */
bool controller_online;
bool block_requests;
- bool in_shutdown;
+ bool block_device_reset;
bool in_ofa;
+ bool in_shutdown;
u8 inbound_spanning_supported : 1;
u8 outbound_spanning_supported : 1;
u8 pqi_mode_enabled : 1;
@@ -1173,6 +1174,7 @@ struct pqi_ctrl_info {
struct pqi_ofa_memory *pqi_ofa_mem_virt_addr;
dma_addr_t pqi_ofa_mem_dma_handle;
void **pqi_ofa_chunk_virt_addr;
+ atomic_t sync_cmds_outstanding;
};

enum pqi_ctrl_mode {
@@ -1423,6 +1425,11 @@ static inline bool pqi_ctrl_blocked(struct pqi_ctrl_info *ctrl_info)
return ctrl_info->block_requests;
}

+static inline bool pqi_device_reset_blocked(struct pqi_ctrl_info *ctrl_info)
+{
+ return ctrl_info->block_device_reset;
+}
+
void pqi_sas_smp_handler(struct bsg_job *job, struct Scsi_Host *shost,
struct sas_rphy *rphy);

diff --git a/drivers/scsi/smartpqi/smartpqi_init.c b/drivers/scsi/smartpqi/smartpqi_init.c
index ea5409bebf578..793793343950e 100644
--- a/drivers/scsi/smartpqi/smartpqi_init.c
+++ b/drivers/scsi/smartpqi/smartpqi_init.c
@@ -249,6 +249,11 @@ static inline void pqi_ctrl_unblock_requests(struct pqi_ctrl_info *ctrl_info)
scsi_unblock_requests(ctrl_info->scsi_host);
}

+static inline void pqi_ctrl_block_device_reset(struct pqi_ctrl_info *ctrl_info)
+{
+ ctrl_info->block_device_reset = true;
+}
+
static unsigned long pqi_wait_if_ctrl_blocked(struct pqi_ctrl_info *ctrl_info,
unsigned long timeout_msecs)
{
@@ -331,6 +336,16 @@ static inline bool pqi_device_in_remove(struct pqi_ctrl_info *ctrl_info,
return device->in_remove && !ctrl_info->in_shutdown;
}

+static inline void pqi_ctrl_shutdown_start(struct pqi_ctrl_info *ctrl_info)
+{
+ ctrl_info->in_shutdown = true;
+}
+
+static inline bool pqi_ctrl_in_shutdown(struct pqi_ctrl_info *ctrl_info)
+{
+ return ctrl_info->in_shutdown;
+}
+
static inline void pqi_schedule_rescan_worker_with_delay(
struct pqi_ctrl_info *ctrl_info, unsigned long delay)
{
@@ -360,6 +375,11 @@ static inline void pqi_cancel_rescan_worker(struct pqi_ctrl_info *ctrl_info)
cancel_delayed_work_sync(&ctrl_info->rescan_work);
}

+static inline void pqi_cancel_event_worker(struct pqi_ctrl_info *ctrl_info)
+{
+ cancel_work_sync(&ctrl_info->event_work);
+}
+
static inline u32 pqi_read_heartbeat_counter(struct pqi_ctrl_info *ctrl_info)
{
if (!ctrl_info->heartbeat_counter)
@@ -4122,6 +4142,8 @@ static int pqi_submit_raid_request_synchronous(struct pqi_ctrl_info *ctrl_info,
goto out;
}

+ atomic_inc(&ctrl_info->sync_cmds_outstanding);
+
io_request = pqi_alloc_io_request(ctrl_info);

put_unaligned_le16(io_request->index,
@@ -4168,6 +4190,7 @@ static int pqi_submit_raid_request_synchronous(struct pqi_ctrl_info *ctrl_info,

pqi_free_io_request(io_request);

+ atomic_dec(&ctrl_info->sync_cmds_outstanding);
out:
up(&ctrl_info->sync_request_sem);

@@ -5402,7 +5425,7 @@ static int pqi_scsi_queue_command(struct Scsi_Host *shost,

pqi_ctrl_busy(ctrl_info);
if (pqi_ctrl_blocked(ctrl_info) || pqi_device_in_reset(device) ||
- pqi_ctrl_in_ofa(ctrl_info)) {
+ pqi_ctrl_in_ofa(ctrl_info) || pqi_ctrl_in_shutdown(ctrl_info)) {
rc = SCSI_MLQUEUE_HOST_BUSY;
goto out;
}
@@ -5650,6 +5673,18 @@ static int pqi_ctrl_wait_for_pending_io(struct pqi_ctrl_info *ctrl_info,
return 0;
}

+static int pqi_ctrl_wait_for_pending_sync_cmds(struct pqi_ctrl_info *ctrl_info)
+{
+ while (atomic_read(&ctrl_info->sync_cmds_outstanding)) {
+ pqi_check_ctrl_health(ctrl_info);
+ if (pqi_ctrl_offline(ctrl_info))
+ return -ENXIO;
+ usleep_range(1000, 2000);
+ }
+
+ return 0;
+}
+
static void pqi_lun_reset_complete(struct pqi_io_request *io_request,
void *context)
{
@@ -5787,17 +5822,17 @@ static int pqi_eh_device_reset_handler(struct scsi_cmnd *scmd)
shost->host_no, device->bus, device->target, device->lun);

pqi_check_ctrl_health(ctrl_info);
- if (pqi_ctrl_offline(ctrl_info)) {
- dev_err(&ctrl_info->pci_dev->dev,
- "controller %u offlined - cannot send device reset\n",
- ctrl_info->ctrl_id);
+ if (pqi_ctrl_offline(ctrl_info) ||
+ pqi_device_reset_blocked(ctrl_info)) {
rc = FAILED;
goto out;
}

pqi_wait_until_ofa_finished(ctrl_info);

+ atomic_inc(&ctrl_info->sync_cmds_outstanding);
rc = pqi_device_reset(ctrl_info, device);
+ atomic_dec(&ctrl_info->sync_cmds_outstanding);

out:
dev_err(&ctrl_info->pci_dev->dev,
@@ -6119,7 +6154,8 @@ static int pqi_ioctl(struct scsi_device *sdev, unsigned int cmd,

ctrl_info = shost_to_hba(sdev->host);

- if (pqi_ctrl_in_ofa(ctrl_info))
+ if (pqi_ctrl_in_ofa(ctrl_info) ||
+ pqi_ctrl_in_shutdown(ctrl_info))
return -EBUSY;

switch (cmd) {
@@ -7074,13 +7110,20 @@ static int pqi_force_sis_mode(struct pqi_ctrl_info *ctrl_info)
return pqi_revert_to_sis_mode(ctrl_info);
}

+#define PQI_POST_RESET_DELAY_B4_MSGU_READY 5000
+
static int pqi_ctrl_init(struct pqi_ctrl_info *ctrl_info)
{
int rc;

- rc = pqi_force_sis_mode(ctrl_info);
- if (rc)
- return rc;
+ if (reset_devices) {
+ sis_soft_reset(ctrl_info);
+ msleep(PQI_POST_RESET_DELAY_B4_MSGU_READY);
+ } else {
+ rc = pqi_force_sis_mode(ctrl_info);
+ if (rc)
+ return rc;
+ }

/*
* Wait until the controller is ready to start accepting SIS
@@ -7514,6 +7557,7 @@ static struct pqi_ctrl_info *pqi_alloc_ctrl_info(int numa_node)

INIT_WORK(&ctrl_info->event_work, pqi_event_worker);
atomic_set(&ctrl_info->num_interrupts, 0);
+ atomic_set(&ctrl_info->sync_cmds_outstanding, 0);

INIT_DELAYED_WORK(&ctrl_info->rescan_work, pqi_rescan_worker);
INIT_DELAYED_WORK(&ctrl_info->update_time_work, pqi_update_time_worker);
@@ -7787,8 +7831,6 @@ static int pqi_ofa_host_memory_update(struct pqi_ctrl_info *ctrl_info)
0, NULL, NO_TIMEOUT);
}

-#define PQI_POST_RESET_DELAY_B4_MSGU_READY 5000
-
static int pqi_ofa_ctrl_restart(struct pqi_ctrl_info *ctrl_info)
{
msleep(PQI_POST_RESET_DELAY_B4_MSGU_READY);
@@ -7956,28 +7998,74 @@ static void pqi_pci_remove(struct pci_dev *pci_dev)
pqi_remove_ctrl(ctrl_info);
}

+static void pqi_crash_if_pending_command(struct pqi_ctrl_info *ctrl_info)
+{
+ unsigned int i;
+ struct pqi_io_request *io_request;
+ struct scsi_cmnd *scmd;
+
+ for (i = 0; i < ctrl_info->max_io_slots; i++) {
+ io_request = &ctrl_info->io_request_pool[i];
+ if (atomic_read(&io_request->refcount) == 0)
+ continue;
+ scmd = io_request->scmd;
+ WARN_ON(scmd != NULL); /* IO command from SML */
+ WARN_ON(scmd == NULL); /* Non-IO cmd or driver initiated*/
+ }
+}
+
static void pqi_shutdown(struct pci_dev *pci_dev)
{
int rc;
struct pqi_ctrl_info *ctrl_info;

ctrl_info = pci_get_drvdata(pci_dev);
- if (!ctrl_info)
- goto error;
+ if (!ctrl_info) {
+ dev_err(&pci_dev->dev,
+ "cache could not be flushed\n");
+ return;
+ }
+
+ pqi_disable_events(ctrl_info);
+ pqi_wait_until_ofa_finished(ctrl_info);
+ pqi_cancel_update_time_worker(ctrl_info);
+ pqi_cancel_rescan_worker(ctrl_info);
+ pqi_cancel_event_worker(ctrl_info);
+
+ pqi_ctrl_shutdown_start(ctrl_info);
+ pqi_ctrl_wait_until_quiesced(ctrl_info);
+
+ rc = pqi_ctrl_wait_for_pending_io(ctrl_info, NO_TIMEOUT);
+ if (rc) {
+ dev_err(&pci_dev->dev,
+ "wait for pending I/O failed\n");
+ return;
+ }
+
+ pqi_ctrl_block_device_reset(ctrl_info);
+ pqi_wait_until_lun_reset_finished(ctrl_info);

/*
* Write all data in the controller's battery-backed cache to
* storage.
*/
rc = pqi_flush_cache(ctrl_info, SHUTDOWN);
- pqi_free_interrupts(ctrl_info);
- pqi_reset(ctrl_info);
- if (rc == 0)
+ if (rc)
+ dev_err(&pci_dev->dev,
+ "unable to flush controller cache\n");
+
+ pqi_ctrl_block_requests(ctrl_info);
+
+ rc = pqi_ctrl_wait_for_pending_sync_cmds(ctrl_info);
+ if (rc) {
+ dev_err(&pci_dev->dev,
+ "wait for pending sync cmds failed\n");
return;
+ }
+
+ pqi_crash_if_pending_command(ctrl_info);
+ pqi_reset(ctrl_info);

-error:
- dev_warn(&pci_dev->dev,
- "unable to flush controller cache\n");
}

static void pqi_process_lockup_action_param(void)
--
2.20.1

Next message: Greg Kroah-Hartman: "[PATCH 5.6 150/167] usb: f_fs: Clear OS Extended descriptor counts to zero in ffs_data_reset()"
Previous message: Greg Kroah-Hartman: "[PATCH 4.19 091/131] mm/hugetlb: fix a addressing exception caused by huge_pte_offset"
In reply to: Greg Kroah-Hartman: "[PATCH 5.4 050/168] virtio-blk: improve virtqueue error to BLK_STS"
Next in thread: Greg Kroah-Hartman: "[PATCH 5.4 053/168] scsi: smartpqi: fix problem with unique ID for physical device"
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