RE: [PATCH] Quirk to support Marvell 88SE91xx SATA controllers with Intel IOMMU.

["Justin Piszcz" <jpiszcz@lucidpixels.com>]

-----Original Message-----
From: Andrew Cooks [mailto:acooks@gmail.com] 
Sent: Friday, March 01, 2013 3:26 AM
To: acooks@gmail.com; joro@8bytes.org; xjtuychu@hotmail.com;
gm.ychu@gmail.com; alex.williamson@redhat.com; bhelgaas@google.com;
jpiszcz@lucidpixels.com; dwmw2@infradead.org
Cc: open list:INTEL IOMMU (VT-d); open list; open list:PCI SUBSYSTEM
Subject: [PATCH] Quirk to support Marvell 88SE91xx SATA controllers with
Intel IOMMU.

This is my third submitted patch to make Marvell 88SE91xx SATA controllers
work when IOMMU is enabled.[1][2]

What's changed:
* Adopt David Woodhouse's terminology by referring to the quirky functions
as 'ghost' functions.
* Unmap ghost functions when device is detached from IOMMU.
* Stub function for when CONFIG_PCI_QUIRKS is not enabled.

The bad:
* Still no AMD support.
* The table of affected chip IDs is as complete as I can make it by googling
for bug reports.

This patch was generated against commit
b0af9cd9aab60ceb17d3ebabb9fdf4ff0a99cf50, but will also apply cleanly to
3.7.10.

--

Hi,

Against 3.7.10:

# patch -p1 <
../RFC-Fix-Intel-IOMMU-support-for-Marvell-88SE91xx-SATA-controllers..patch 
patching file drivers/iommu/intel-iommu.c
patching file drivers/pci/quirks.c
Hunk #1 succeeded at 3230 (offset 3 lines).
patching file include/linux/pci.h
#

Recompile kernel, reboot..

Shutdown host, re-attach to Marvell Controller w/IOMMU.

The host still failed to boot, dmesg/panic here:
http://home.comcast.net/~jpiszcz/20130301/boot_failure.JPG

(The root disk is /dev/sdc)

I recompiled again with IOMMU off and it booted ok:

# uname -a
Linux host 3.7.10 #2 SMP Fri Mar 1 12:44:25 EST 2013 x86_64 GNU/Linux

Here is the part of dmesg (what it looks like when it succeeds with
IOMMU=off)

[    4.288113] input: American Megatrends Inc. Virtual Keyboard and Mouse as
/devices/pci0000:00/0000:00:1a.1/usb4/4-2/4-2:1.0/input/input3
[    4.289025] hid-generic 0003:046B:FF10.0001: input,hidraw0: USB HID v1.10
Keyboard [American Megatrends Inc. Virtual Keyboard and Mouse] on
usb-0000:00:1a.1-2/input0
[    4.305993] input: American Megatrends Inc. Virtual Keyboard and Mouse as
/devices/pci0000:00/0000:00:1a.1/usb4/4-2/4-2:1.1/input/input4
[    4.307106] hid-generic 0003:046B:FF10.0002: input,hidraw1: USB HID v1.10
Mouse [American Megatrends Inc. Virtual Keyboard and Mouse] on
usb-0000:00:1a.1-2/input1
[    4.326481] ata6: SATA link down (SStatus 0 SControl 300)
[    4.327324] scsi 7:0:0:0: Direct-Access     ATA      INTEL SSDSC2MH25
PWG4 PQ: 0 ANSI: 5
[    4.329953] sd 7:0:0:0: [sdc] 488397168 512-byte logical blocks: (250
GB/232 GiB)
[    4.330639] scsi 14:0:0:0: Processor         Marvell  91xx Config
1.01 PQ: 0 ANSI: 5
[    4.333276] sd 7:0:0:0: [sdc] Write Protect is off
[    4.334746] sd 7:0:0:0: [sdc] Mode Sense: 00 3a 00 00
[    4.334921] sd 7:0:0:0: [sdc] Write cache: enabled, read cache: enabled,
doesn't support DPO or FUA
[    4.345622]  sdc: sdc1 sdc2
[    4.347493] sd 7:0:0:0: [sdc] Attached SCSI disk

Justin.