From: Jeff Garzik <jgarzik@pobox.com>
To: linux-ide@vger.kernel.org
Cc: Ricky Beam <jfbeam@bluetronic.net>,
Linux Kernel <linux-kernel@vger.kernel.org>
Subject: [PATCH] fix sata_sil quirk
Date: Tue, 22 Jun 2004 16:22:33 -0400 [thread overview]
Message-ID: <40D89509.6010502@pobox.com> (raw)
[-- Attachment #1: Type: text/plain, Size: 727 bytes --]
Here's my suggested fix... good catch Ricky.
Yes, unfortunately performance will be dog slow.
Silicon Image 311x is fully SATA compliant -- but it's the only
controller that sends odd-sized packets to the SATA device. That causes
no end of problems, including the thing that SIL_QUIRK_MOD15WRITE
attempts to work around.
I've got contacts at Silicon Image, and have been meaning to bug them
for a "real fix" for a while. It is rumored that there is a much better
fix, which allows full performance while at the same time not killing
your SATA drive due to odd-sized SATA frames on the wire.
Unfortunately, at this point in time, we must err on the side of caution
and cripple performance, for stability.
Jeff
[-- Attachment #2: patch --]
[-- Type: text/plain, Size: 1365 bytes --]
===== drivers/scsi/libata-scsi.c 1.39 vs edited =====
--- 1.39/drivers/scsi/libata-scsi.c 2004-05-12 11:46:21 -04:00
+++ edited/drivers/scsi/libata-scsi.c 2004-06-22 16:18:57 -04:00
@@ -182,7 +182,8 @@
* 65534 when Jens Axboe's patch for dynamically
* determining max_sectors is merged.
*/
- if (dev->flags & ATA_DFLAG_LBA48) {
+ if ((dev->flags & ATA_DFLAG_LBA48) &&
+ ((dev->flags & ATA_DFLAG_LOCK_SECTORS) == 0)) {
sdev->host->max_sectors = 2048;
blk_queue_max_sectors(sdev->request_queue, 2048);
}
===== drivers/scsi/sata_sil.c 1.26 vs edited =====
--- 1.26/drivers/scsi/sata_sil.c 2004-06-15 00:29:32 -04:00
+++ edited/drivers/scsi/sata_sil.c 2004-06-22 16:18:21 -04:00
@@ -302,6 +302,7 @@
ap->id, dev->devno);
ap->host->max_sectors = 15;
ap->host->hostt->max_sectors = 15;
+ dev->flags |= ATA_DFLAG_LOCK_SECTORS;
return;
}
===== include/linux/libata.h 1.38 vs edited =====
--- 1.38/include/linux/libata.h 2004-06-22 00:54:44 -04:00
+++ edited/include/linux/libata.h 2004-06-22 16:17:44 -04:00
@@ -91,6 +91,7 @@
ATA_DFLAG_MASTER = (1 << 2), /* is device 0? */
ATA_DFLAG_WCACHE = (1 << 3), /* has write cache we can
* (hopefully) flush? */
+ ATA_DFLAG_LOCK_SECTORS = (1 << 4), /* don't adjust max_sectors */
ATA_DEV_UNKNOWN = 0, /* unknown device */
ATA_DEV_ATA = 1, /* ATA device */
next reply other threads:[~2004-06-22 20:28 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-06-22 20:22 Jeff Garzik [this message]
2004-06-22 20:29 ` [PATCH] fix sata_sil quirk Ricky Beam
2004-06-22 20:41 ` Jeff Garzik
2004-06-22 22:12 ` Jeff Garzik
2004-06-23 0:34 ` Ricky Beam
2004-06-23 3:24 ` Paul Jakma
2004-06-23 3:39 ` Jeff Garzik
2004-06-23 3:46 ` Paul Jakma
2004-06-23 3:51 ` Jeff Garzik
2004-06-23 6:34 ` Ricky Beam
2004-06-28 1:54 ` George Georgalis
2004-09-27 3:40 ` George Georgalis
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