Hi Marek,
it looks like the hardware sign extends bit 47 into bits 48-63. E.g.
0x8000 gets extended to 0xffff8000.
Christian.
Am 03.02.2018 um 03:02 schrieb Marek Olšák:
> Hi Christian,
>
> How does this work with 48-bit addresses that the 3D engine uses? It
> can't set 0xffff8000 for the high bits. It's trimmed to 0x8000.
>
> Thanks,
> Marek
>
> On Sun, Jan 7, 2018 at 10:11 AM, Christian König
> <ckoenig.leichtzumerken at gmail.com> wrote:
>> Retire the low range on Vega10 this frees up everything below 0xffff800000000000 for HMM.
>>
>> v2: keep the 32bit range working.
>>
>> Signed-off-by: Christian König <christian.koenig at amd.com>
>> ---
>> amdgpu/amdgpu_device.c | 18 ++++++++++++++----
>> 1 file changed, 14 insertions(+), 4 deletions(-)
>>
>> diff --git a/amdgpu/amdgpu_device.c b/amdgpu/amdgpu_device.c
>> index d7077184..a0d01727 100644
>> --- a/amdgpu/amdgpu_device.c
>> +++ b/amdgpu/amdgpu_device.c
>> @@ -264,13 +264,23 @@ int amdgpu_device_initialize(int fd,
>> goto cleanup;
>> }
>>
>> - start = dev->dev_info.virtual_address_offset;
>> - max = MIN2(dev->dev_info.virtual_address_max, 0x100000000ULL);
>> + if (dev->dev_info.high_va_offset && dev->dev_info.high_va_max) {
>> + start = dev->dev_info.high_va_offset;
>> + max = dev->dev_info.high_va_max;
>> + } else {
>> + start = dev->dev_info.virtual_address_offset;
>> + max = dev->dev_info.virtual_address_max;
>> + }
>> +
>> + max = MIN2(max, (start & ~0xffffffff) + 0x100000000ULL);
>> amdgpu_vamgr_init(&dev->vamgr_32, start, max,
>> dev->dev_info.virtual_address_alignment);
>>
>> - start = MAX2(dev->dev_info.virtual_address_offset, 0x100000000ULL);
>> - max = MAX2(dev->dev_info.virtual_address_max, 0x100000000ULL);
>> + start = max;
>> + if (dev->dev_info.high_va_offset && dev->dev_info.high_va_max)
>> + max = dev->dev_info.high_va_max;
>> + else
>> + max = dev->dev_info.virtual_address_max;
>> amdgpu_vamgr_init(&dev->vamgr, start, max,
>> dev->dev_info.virtual_address_alignment);
>>
>> --
>> 2.11.0
>>
>> _______________________________________________
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>> amd-gfx at lists.freedesktop.org
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