On 08/28/2018 12:53 AM, Christian König wrote: > Only use the lower address space on GMC9 for the system domain. > Otherwise we would need to sign extend GMC addresses. > > Signed-off-by: Christian König <christian.koenig at amd.com> > --- > drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c | 7 +++---- > 1 file changed, 3 insertions(+), 4 deletions(-) > > diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c > index e44b5191735d..d982956c8329 100644 > --- a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c > +++ b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c > @@ -938,11 +938,10 @@ static int gmc_v9_0_sw_init(void *handle) > if (r) > return r; > > - /* Set the internal MC address mask > - * This is the max address of the GPU's > - * internal address space. > + /* Use only the lower range for the internal MC address mask. This is > + * the max address of the GPU's internal address space. > */ > - adev->gmc.mc_mask = 0xffffffffffffULL; /* 48 bit MC */ > + adev->gmc.mc_mask = 0x7fffffffffffULL; do we need to update vm_size as 128T at the same time? Jerry > > /* set DMA mask + need_dma32 flags. > * PCIE - can handle 44-bits. >
