[stable] [PATCH] drm/radeon/kms: fix possible sigbus in evergreen accel code

[Alex Deucher]

On Tue, Oct 19, 2010 at 5:00 PM, Greg KH <greg at kroah.com> wrote:
> I need the ack from the DRM maintainer before I can add a patch to the
> stable tree that is not upstream in Linus's tree, as it is a major
> exception to the rule.

A better fix ended up making it into 2.6.36 afterall, so we don't
anything for 2.6.36.
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=c919b371cb734f42b1130e706ecee262f8d9261d

However, either patch will work for 2.6.35.

Alex

>
> David?
>
>
> On Tue, Oct 12, 2010 at 12:20:31PM -0400, Alex Deucher wrote:
>> 2.6.35 and 2.6.36 do not contain blit support for evergreen
>> asics so if they use unmappable vram, you can end up with an
>> unreachable buffer address.  This should not be applied to drm-next
>> as that tree already contains evergreen blit support.  This should
>> only be applied to the 2.6.35 and 2.6.36 stable trees.
>>
>> Fixes:
>> https://bugs.freedesktop.org/show_bug.cgi?id=30188
>>
>> Signed-off-by: Alex Deucher <alexdeucher at gmail.com>
>> Cc: stable at kernel.org
>> ---
>>  drivers/gpu/drm/radeon/evergreen.c |    2 ++
>>  1 files changed, 2 insertions(+), 0 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/radeon/evergreen.c b/drivers/gpu/drm/radeon/evergreen.c
>> index 2117cf5..f8c0f15 100644
>> --- a/drivers/gpu/drm/radeon/evergreen.c
>> +++ b/drivers/gpu/drm/radeon/evergreen.c
>> @@ -1480,6 +1480,8 @@ int evergreen_mc_init(struct radeon_device *rdev)
>>       rdev->mc.mc_vram_size = RREG32(CONFIG_MEMSIZE) * 1024 * 1024;
>>       rdev->mc.real_vram_size = RREG32(CONFIG_MEMSIZE) * 1024 * 1024;
>>       rdev->mc.visible_vram_size = rdev->mc.aper_size;
>> +     /* limit it to the aperture size for now as there is no blit support in 2.6.35/36*/
>> +     rdev->mc.real_vram_size = rdev->mc.visible_vram_size;
>>       r600_vram_gtt_location(rdev, &rdev->mc);
>>       radeon_update_bandwidth_info(rdev);
>>
>> --
>> 1.7.1.1
>>
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>