https://github.com/torvalds/linux
Revision 318fe782539c4150d1b8e4e6c9dc3a896512cb8a authored by Suravee Suthikulpanit on 24 January 2013, 19:17:53 UTC, committed by Joerg Roedel on 28 January 2013, 14:26:54 UTC
The IOMMU may stop processing page translations due to a perceived lack
of credits for writing upstream peripheral page service request (PPR)
or event logs. If the L2B miscellaneous clock gating feature is enabled
the IOMMU does not properly register credits after the log request has
completed, leading to a potential system hang.

BIOSes are supposed to disable L2B micellaneous clock gating by setting
L2_L2B_CK_GATE_CONTROL[CKGateL2BMiscDisable](D0F2xF4_x90[2]) = 1b. This
patch corrects that for those which do not enable this workaround.

Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Acked-by: Borislav Petkov <bp@suse.de>
Cc: stable@vger.kernel.org
Signed-off-by: Joerg Roedel <joro@8bytes.org>
1 parent 949db15
History
Tip revision: 318fe782539c4150d1b8e4e6c9dc3a896512cb8a authored by Suravee Suthikulpanit on 24 January 2013, 19:17:53 UTC
IOMMU, AMD Family15h Model10-1Fh erratum 746 Workaround
Tip revision: 318fe78
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arch
block
crypto
drivers
firmware
fs
include
init
ipc
kernel
lib
mm
net
samples
scripts
security
sound
tools
usr
virt
.gitignore -rw-r--r-- 1.1 KB
.mailmap -rw-r--r-- 4.4 KB
COPYING -rw-r--r-- 18.3 KB
CREDITS -rw-r--r-- 92.8 KB
Kbuild -rw-r--r-- 2.5 KB
Kconfig -rw-r--r-- 252 bytes
MAINTAINERS -rw-r--r-- 234.3 KB
Makefile -rw-r--r-- 46.9 KB
README -rw-r--r-- 18.3 KB
REPORTING-BUGS -rw-r--r-- 3.3 KB

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