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scsi: ses: don't ask for diagnostic pages repeatedly during probe 

We are testing if there is a match with the ses device in a loop by
calling ses_match_to_enclosure(), which will issue scsi receive
diagnostics commands to the ses device for every device on the same
host.  On one of our boxes with 840 disks, it takes a long time to load
the driver:

[root@g1b-oss06 ~]# time modprobe ses

real	40m48.247s
user	0m0.001s
sys	0m0.196s

With the patch:

[root@g1b-oss06 ~]# time modprobe ses

real	0m17.915s
user	0m0.008s
sys	0m0.053s

Note that we still need to refresh page 10 when we see a new disk to
create the link.

Signed-off-by: Li Dongyang <dongyang.li@anu.edu.au>
Tested-by: Jason Ozolins <jason.ozolins@hpe.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Li Dongyang 2017-11-14 10:48:04 +11:00 committed by Martin K. Petersen
parent d828e5c6d7
commit 9c0a50022b
1 changed files with 7 additions and 4 deletions
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11
drivers/scsi/ses.c
View File

@ -615,13 +615,16 @@ static void ses_enclosure_data_process(struct enclosure_device *edev,
}
static void ses_match_to_enclosure(struct enclosure_device *edev,
struct scsi_device *sdev)
struct scsi_device *sdev,
int refresh)
{
struct scsi_device *edev_sdev = to_scsi_device(edev->edev.parent);
struct efd efd = {
.addr = 0,
};
ses_enclosure_data_process(edev, to_scsi_device(edev->edev.parent), 0);
if (refresh)
ses_enclosure_data_process(edev, edev_sdev, 0);
if (scsi_is_sas_rphy(sdev->sdev_target->dev.parent))
efd.addr = sas_get_address(sdev);
@ -652,7 +655,7 @@ static int ses_intf_add(struct device *cdev,
struct enclosure_device *prev = NULL;
while ((edev = enclosure_find(&sdev->host->shost_gendev, prev)) != NULL) {
ses_match_to_enclosure(edev, sdev);
ses_match_to_enclosure(edev, sdev, 1);
prev = edev;
}
return -ENODEV;
@ -768,7 +771,7 @@ static int ses_intf_add(struct device *cdev,
shost_for_each_device(tmp_sdev, sdev->host) {
if (tmp_sdev->lun != 0 || scsi_device_enclosure(tmp_sdev))
continue;
ses_match_to_enclosure(edev, tmp_sdev);
ses_match_to_enclosure(edev, tmp_sdev, 0);
}
return 0;