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scsi: hisi_sas: Run I_T nexus resets in parallel for clear nexus reset

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For a clear nexus reset operation, the I_T nexus resets are executed
serially for each device. For devices attached through an expander, this
may take 2s per device; so, in total, could take a long time.

Reduce the total time by running the I_T nexus resets in parallel through
async operations.

Link: https://lore.kernel.org/r/1623058179-80434-3-git-send-email-john.garry@huawei.com
Signed-off-by: Luo Jiaxing <luojiaxing@huawei.com>
Signed-off-by: John Garry <john.garry@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Luo Jiaxing 2021-06-07 17:29:36 +08:00 committed by Martin K. Petersen
parent 366da0da1f
commit 0f75733991
2 changed files with 18 additions and 6 deletions
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1
drivers/scsi/hisi_sas/hisi_sas.h
View file

@ -8,6 +8,7 @@
#define _HISI_SAS_H_
#include <linux/acpi.h>
#include <linux/async.h>
#include <linux/blk-mq.h>
#include <linux/blk-mq-pci.h>
#include <linux/clk.h>

23
drivers/scsi/hisi_sas/hisi_sas_main.c
View file

@ -1886,12 +1886,24 @@ static int hisi_sas_lu_reset(struct domain_device *device, u8 *lun)
return rc;
}
static void hisi_sas_async_I_T_nexus_reset(void *data, async_cookie_t cookie)
{
struct domain_device *device = data;
struct hisi_hba *hisi_hba = dev_to_hisi_hba(device);
int rc;
rc = hisi_sas_debug_I_T_nexus_reset(device);
if (rc != TMF_RESP_FUNC_COMPLETE)
dev_info(hisi_hba->dev, "I_T_nexus reset fail for dev:%016llx rc=%d\n",
SAS_ADDR(device->sas_addr), rc);
}
static int hisi_sas_clear_nexus_ha(struct sas_ha_struct *sas_ha)
{
struct hisi_hba *hisi_hba = sas_ha->lldd_ha;
struct device *dev = hisi_hba->dev;
HISI_SAS_DECLARE_RST_WORK_ON_STACK(r);
int rc, i;
ASYNC_DOMAIN_EXCLUSIVE(async);
int i;
queue_work(hisi_hba->wq, &r.work);
wait_for_completion(r.completion);
@ -1906,12 +1918,11 @@ static int hisi_sas_clear_nexus_ha(struct sas_ha_struct *sas_ha)
dev_is_expander(device->dev_type))
continue;
rc = hisi_sas_debug_I_T_nexus_reset(device);
if (rc != TMF_RESP_FUNC_COMPLETE)
dev_info(dev, "clear nexus ha: for device[%d] rc=%d\n",
sas_dev->device_id, rc);
async_schedule_domain(hisi_sas_async_I_T_nexus_reset,
device, &async);
}
async_synchronize_full_domain(&async);
hisi_sas_release_tasks(hisi_hba);
return TMF_RESP_FUNC_COMPLETE;