diff options
| author | Li Dongyang <dongyang.li@anu.edu.au> | 2017-11-14 10:48:04 +1100 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2017-12-04 22:55:59 -0500 |
| commit | 9c0a50022b8ac7e863e6ec8342fa476fe5d1d75c (patch) | |
| tree | df834c552366b6f80905fe6b93dd70a6ab758340 /drivers/scsi/ses.c | |
| parent | d828e5c6d7a0bdca824481189bb7a911a6bf2d31 (diff) | |
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>
Diffstat (limited to 'drivers/scsi/ses.c')
| -rw-r--r-- | drivers/scsi/ses.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/drivers/scsi/ses.c b/drivers/scsi/ses.c index 11826c5c2dd4..62f04c0511cf 100644 --- a/drivers/scsi/ses.c +++ b/drivers/scsi/ses.c @@ -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 @@ page2_not_supported: 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; |