[PATCH 13/18] hpsa: use scsi_host_busy_iter() to traverse outstanding commands

Hannes Reinecke
2021-05-03T15:04:05Z

Replace all hand-crafted command iterations with
scsi_host_busy_iter() calls.

Signed-off-by: Hannes Reinecke <hare@suse.de>
Acked-by: Don Brace <don.brace@microchip.com>
Tested-by: Don Brace <don.brace@microchip.com>
---
drivers/scsi/hpsa.c | 117 +++++++++++++++++++++++++-------------------
1 file changed, 67 insertions(+), 50 deletions(-)

diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
index 7a4fcd40364b..282338944a85 100644
--- a/drivers/scsi/hpsa.c
+++ b/drivers/scsi/hpsa.c
@@ -1820,30 +1820,26 @@ static int hpsa_add_device(struct ctlr_info *h, struct hpsa_scsi_dev_t *device)
return rc;
}

-static int hpsa_find_outstanding_commands_for_dev(struct ctlr_info *h,
- struct hpsa_scsi_dev_t *dev)
-{
- int i;
- int count = 0;
-
- for (i = 0; i < h->nr_cmds; i++) {
- struct CommandList *c = h->cmd_pool + i;
- int refcount = atomic_inc_return(&c->refcount);
-
- if (refcount > 1 && hpsa_cmd_dev_match(h, c, dev,
- dev->scsi3addr)) {
- unsigned long flags;
+struct hpsa_command_iter_data {
+ struct ctlr_info *h;
+ struct hpsa_scsi_dev_t *dev;
+ unsigned char *scsi3addr;
+ int count;
+};

- spin_lock_irqsave(&h->lock, flags); /* Implied MB */
- if (!hpsa_is_cmd_idle(c))
- ++count;
- spin_unlock_irqrestore(&h->lock, flags);
- }
+static bool hpsa_find_outstanding_commands_iter(struct scsi_cmnd *sc,
+ void *data, bool reserved)
+{
+ struct hpsa_command_iter_data *iter_data = data;
+ struct ctlr_info *h = iter_data->h;
+ struct hpsa_scsi_dev_t *dev = iter_data->dev;
+ struct CommandList *c = h->cmd_pool + sc->request->tag;

- cmd_free(h, c);
+ if (hpsa_cmd_dev_match(h, c, dev, dev->scsi3addr)) {
+ iter_data->count++;
+ return false;
}
-
- return count;
+ return true;
}

#define NUM_WAIT 20
@@ -1853,13 +1849,20 @@ static void hpsa_wait_for_outstanding_commands_for_dev(struct ctlr_info *h,
int cmds = 0;
int waits = 0;
int num_wait = NUM_WAIT;
+ struct hpsa_command_iter_data iter_data = {
+ .h = h,
+ .dev = device,
+ };

if (device->external)
num_wait = HPSA_EH_PTRAID_TIMEOUT;

while (1) {
- cmds = hpsa_find_outstanding_commands_for_dev(h, device);
- if (cmds == 0)
+ iter_data.count = 0;
+ scsi_host_busy_iter(h->scsi_host,
+ hpsa_find_outstanding_commands_iter,
+ &iter_data);
+ if (iter_data.count == 0)
break;
if (++waits > num_wait)
break;
@@ -8180,27 +8183,34 @@ static void hpsa_undo_allocations_after_kdump_soft_reset(struct ctlr_info *h)
kfree(h); /* init_one 1 */
}

+static bool fail_all_outstanding_cmds_iter(struct scsi_cmnd *sc, void *data,
+ bool reserved)
+{
+ struct hpsa_command_iter_data *iter_data = data;
+ struct ctlr_info *h = iter_data->h;
+ struct CommandList *c = h->cmd_pool + sc->request->tag;
+
+ c->err_info->CommandStatus = CMD_CTLR_LOCKUP;
+ finish_cmd(c);
+ atomic_dec(&h->commands_outstanding);
+ iter_data->count++;
+
+ return true;
+}
+
/* Called when controller lockup detected. */
static void fail_all_outstanding_cmds(struct ctlr_info *h)
{
- int i, refcount;
- struct CommandList *c;
- int failcount = 0;
+ struct hpsa_command_iter_data iter_data = {
+ .h = h,
+ .count = 0,
+ };

flush_workqueue(h->resubmit_wq); /* ensure all cmds are fully built */
- for (i = 0; i < h->nr_cmds; i++) {
- c = h->cmd_pool + i;
- refcount = atomic_inc_return(&c->refcount);
- if (refcount > 1) {
- c->err_info->CommandStatus = CMD_CTLR_LOCKUP;
- finish_cmd(c);
- atomic_dec(&h->commands_outstanding);
- failcount++;
- }
- cmd_free(h, c);
- }
+ scsi_host_busy_iter(h->scsi_host,
+ fail_all_outstanding_cmds_iter, &iter_data);
dev_warn(&h->pdev->dev,
- "failed %d commands in fail_all\n", failcount);
+ "failed %d commands in fail_all\n", iter_data.count);
}

static void set_lockup_detected_for_all_cpus(struct ctlr_info *h, u32 value)
@@ -9499,22 +9509,29 @@ static int is_accelerated_cmd(struct CommandList *c)
return c->cmd_type == CMD_IOACCEL1 || c->cmd_type == CMD_IOACCEL2;
}

+static bool hpsa_drain_accel_commands_iter(struct scsi_cmnd *sc, void *data,
+ bool reserved)
+{
+ struct hpsa_command_iter_data *iter_data = data;
+ struct ctlr_info *h = iter_data->h;
+ struct CommandList *c = h->cmd_pool + sc->request->tag;
+
+ iter_data->count += is_accelerated_cmd(c);
+ return true;
+}
+
static void hpsa_drain_accel_commands(struct ctlr_info *h)
{
- struct CommandList *c = NULL;
- int i, accel_cmds_out;
- int refcount;
+ struct hpsa_command_iter_data iter_data = {
+ .h = h,
+ };

do { /* wait for all outstanding ioaccel commands to drain out */
- accel_cmds_out = 0;
- for (i = 0; i < h->nr_cmds; i++) {
- c = h->cmd_pool + i;
- refcount = atomic_inc_return(&c->refcount);
- if (refcount > 1) /* Command is allocated */
- accel_cmds_out += is_accelerated_cmd(c);
- cmd_free(h, c);
- }
- if (accel_cmds_out <= 0)
+ iter_data.count = 0;
+ scsi_host_busy_iter(h->scsi_host,
+ hpsa_drain_accel_commands_iter,
+ &iter_data);
+ if (iter_data.count <= 0)
break;
msleep(100);
} while (1);
--
2.29.2