On Mon, Nov 22, 2010 at 12:35 PM, Jerome Glisse <j.glisse@xxxxxxxxx> wrote:
> On Mon, Nov 22, 2010 at 12:31 PM, Thomas Hellstrom <thomas@xxxxxxxxxxxx> wrote:
>> On 11/22/2010 06:07 PM, Jerome Glisse wrote:
>>>
>>> 2010/11/22 Michel Dänzer<michel@xxxxxxxxxxx>:
>>>
>>>>
>>>> On Fre, 2010-11-19 at 16:34 -0500, jglisse@xxxxxxxxxx wrote:
>>>>
>>>>>
>>>>> From: Jerome Glisse<jglisse@xxxxxxxxxx>
>>>>>
>>>>> Forbid allocating buffer bigger than visible VRAM or GTT, also
>>>>> properly set lpfn field.
>>>>>
>>>>> v2 - use max macro
>>>>> - silence warning
>>>>>
>>>>> Signed-off-by: Jerome Glisse<jglisse@xxxxxxxxxx>
>>>>> ---
>>>>> drivers/gpu/drm/radeon/radeon_object.c | 34
>>>>> ++++++++++++++++++++++++++-----
>>>>> 1 files changed, 28 insertions(+), 6 deletions(-)
>>>>>
>>>>> diff --git a/drivers/gpu/drm/radeon/radeon_object.c
>>>>> b/drivers/gpu/drm/radeon/radeon_object.c
>>>>> index 1d06774..c2fa64c 100644
>>>>> --- a/drivers/gpu/drm/radeon/radeon_object.c
>>>>> +++ b/drivers/gpu/drm/radeon/radeon_object.c
>>>>> @@ -69,18 +69,28 @@ void radeon_ttm_placement_from_domain(struct
>>>>> radeon_bo *rbo, u32 domain)
>>>>> u32 c = 0;
>>>>>
>>>>> rbo->placement.fpfn = 0;
>>>>> - rbo->placement.lpfn = rbo->rdev->mc.active_vram_size>>
>>>>> PAGE_SHIFT;
>>>>> + rbo->placement.lpfn = 0;
>>>>> rbo->placement.placement = rbo->placements;
>>>>> rbo->placement.busy_placement = rbo->placements;
>>>>> - if (domain& RADEON_GEM_DOMAIN_VRAM)
>>>>> + if (domain& RADEON_GEM_DOMAIN_VRAM) {
>>>>> + rbo->placement.lpfn = max((unsigned)rbo->placement.lpfn,
>>>>> (unsigned)rbo->rdev->mc.active_vram_size>> PAGE_SHIFT);
>>>>> rbo->placements[c++] = TTM_PL_FLAG_WC |
>>>>> TTM_PL_FLAG_UNCACHED |
>>>>> TTM_PL_FLAG_VRAM;
>>>>> - if (domain& RADEON_GEM_DOMAIN_GTT)
>>>>> + }
>>>>> + if (domain& RADEON_GEM_DOMAIN_GTT) {
>>>>> + rbo->placement.lpfn = max((unsigned)rbo->placement.lpfn,
>>>>> (unsigned)rbo->rdev->mc.gtt_size>> PAGE_SHIFT);
>>>>> rbo->placements[c++] = TTM_PL_MASK_CACHING |
>>>>> TTM_PL_FLAG_TT;
>>>>> - if (domain& RADEON_GEM_DOMAIN_CPU)
>>>>> + }
>>>>> + if (domain& RADEON_GEM_DOMAIN_CPU) {
>>>>> + /* 4G limit for CPU domain */
>>>>> + rbo->placement.lpfn = max(rbo->placement.lpfn,
>>>>> 0xFFFFFFFF>> PAGE_SHIFT);
>>>>> rbo->placements[c++] = TTM_PL_MASK_CACHING |
>>>>> TTM_PL_FLAG_SYSTEM;
>>>>> - if (!c)
>>>>> + }
>>>>> + if (!c) {
>>>>> + /* 4G limit for CPU domain */
>>>>> + rbo->placement.lpfn = max(rbo->placement.lpfn,
>>>>> 0xFFFFFFFF>> PAGE_SHIFT);
>>>>> rbo->placements[c++] = TTM_PL_MASK_CACHING |
>>>>> TTM_PL_FLAG_SYSTEM;
>>>>> + }
>>>>>
>>>>
>>>> I don't think taxing the maximum is the right thing to do: If domain is
>>>> (RADEON_GEM_DOMAIN_VRAM | RADEON_GEM_DOMAIN_GTT) and VRAM doesn't happen
>>>> to be the same size as GTT, lpfn will end up larger than one of them.
>>>>
>>>> AFAICT radeon_ttm_placement_from_domain() should just set lpfn to 0
>>>> (i.e. unrestricted), the callers that need it to be non-0 already set it
>>>> afterwards.
>>>>
>>>> Out of curiosity, where does the 4G limit come from?
>>>>
>>>>
>>>>
>>>
>>> > From my hat, but iirc ttm limit things to 1G anyway (vm size for
>>> mapping object in drm file and iirc we will report error if we can't
>>> find a mapping for userspace object). I guess at one point we should
>>> start thinking about what we want to do on that front.
>>>
>>
>> That limit is taken from *my* hat. Nothing prevents us to increase that
>> limit to whatever.
>>
>> /Thomas
>>
>
> I think we can at most have 3G as the lower space is use by old drm stuff iirc.
We already sell cards with 4 GB of vram.
Alex
>
> Cheers,
> Jerome
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