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Date: Sat, 3 Mar 2018 22:26:24 +0000 From: Sasha Levin <Alexander.Levin@...rosoft.com> To: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "stable@...r.kernel.org" <stable@...r.kernel.org> CC: Li Dongyang <dongyang.li@....edu.au>, "Martin K . Petersen" <martin.petersen@...cle.com>, Sasha Levin <Alexander.Levin@...rosoft.com> Subject: [PATCH AUTOSEL for 4.14 43/84] scsi: ses: don't ask for diagnostic pages repeatedly during probe From: Li Dongyang <dongyang.li@....edu.au> [ Upstream commit 9c0a50022b8ac7e863e6ec8342fa476fe5d1d75c ] 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@...-oss06 ~]# time modprobe ses real 40m48.247s user 0m0.001s sys 0m0.196s With the patch: [root@...-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@....edu.au> Tested-by: Jason Ozolins <jason.ozolins@....com> Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com> Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com> --- drivers/scsi/ses.c | 11 +++++++---- 1 file 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; -- 2.14.1
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