From: Kevin Barnett <kevin.barnett@microsemi.com>
Date: Mon, 7 Oct 2019 17:31:23 -0500
Subject: scsi: smartpqi: fix controller lockup observed during force reboot
Patch-mainline: v5.5-rc1
Git-commit: 0530736e40a0695b1ee2762e2684d00549699da4
References: bsc#1172418
Link: https://lore.kernel.org/r/157048748297.11757.3872221216800537383.stgit@brunhilda
Reviewed-by: Scott Benesh <scott.benesh@microsemi.com>
Reviewed-by: Scott Teel <scott.teel@microsemi.com>
Signed-off-by: Kevin Barnett <kevin.barnett@microsemi.com>
Signed-off-by: Don Brace <don.brace@microsemi.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Acked-by: Martin Wilck <mwilck@suse.com>
---
drivers/scsi/smartpqi/smartpqi.h | 9 ++
drivers/scsi/smartpqi/smartpqi_init.c | 126 ++++++++++++++++++++++++++++------
2 files changed, 115 insertions(+), 20 deletions(-)
--- 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(stru
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);
--- a/drivers/scsi/smartpqi/smartpqi_init.c
+++ b/drivers/scsi/smartpqi/smartpqi_init.c
@@ -249,6 +249,11 @@ static inline void pqi_ctrl_unblock_requ
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(
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_wor
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)
@@ -4123,6 +4143,8 @@ static int pqi_submit_raid_request_synch
goto out;
}
+ atomic_inc(&ctrl_info->sync_cmds_outstanding);
+
io_request = pqi_alloc_io_request(ctrl_info);
put_unaligned_le16(io_request->index,
@@ -4169,6 +4191,7 @@ static int pqi_submit_raid_request_synch
pqi_free_io_request(io_request);
+ atomic_dec(&ctrl_info->sync_cmds_outstanding);
out:
up(&ctrl_info->sync_request_sem);
@@ -5401,7 +5424,7 @@ static int pqi_scsi_queue_command(struct
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;
}
@@ -5649,6 +5672,18 @@ static int pqi_ctrl_wait_for_pending_io(
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)
{
@@ -5786,17 +5821,17 @@ static int pqi_eh_device_reset_handler(s
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,
@@ -6116,7 +6151,8 @@ static int pqi_ioctl(struct scsi_device
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) {
@@ -7072,13 +7108,20 @@ static int pqi_force_sis_mode(struct pqi
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
@@ -7512,6 +7555,7 @@ static struct pqi_ctrl_info *pqi_alloc_c
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);
@@ -7785,8 +7829,6 @@ static int pqi_ofa_host_memory_update(st
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);
@@ -7954,28 +7996,74 @@ static void pqi_pci_remove(struct pci_de
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)