Add a module parameter to force sg (scatter/gather) display on APUs. Normally we allow displays in both VRAM and GTT, but this option forces displays into GTT so we can explicitly test more scenarios with GTT. v2: fix checks Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx> --- For reference since the original patch was buggy. drivers/gpu/drm/amd/amdgpu/amdgpu.h | 2 ++ drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 12 ++++++++++++ drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 3 +++ 3 files changed, 17 insertions(+) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h index 872450a3a164..73d0a0807138 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h @@ -244,6 +244,8 @@ extern int amdgpu_num_kcq; #define AMDGPU_VCNFW_LOG_SIZE (32 * 1024) extern int amdgpu_vcnfw_log; +extern int amdgpu_force_sg_display; + #define AMDGPU_VM_MAX_NUM_CTX 4096 #define AMDGPU_SG_THRESHOLD (256*1024*1024) #define AMDGPU_DEFAULT_GTT_SIZE_MB 3072ULL /* 3GB by default */ diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c index 4cf2028b5235..c8975c2da853 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c @@ -943,6 +943,18 @@ MODULE_PARM_DESC(smu_pptable_id, "specify pptable id to be used (-1 = auto(default) value, 0 = use pptable from vbios, > 0 = soft pptable id)"); module_param_named(smu_pptable_id, amdgpu_smu_pptable_id, int, 0444); +/** + * DOC: force_sg_display (int) + * Force display buffers into GTT (scatter/gather) memory for APUs. + * This is used to force GTT only for displays rather than displaying from + * either VRAM (carve out) or GTT. + * + * Defaults to 0, or disabled. + */ +int amdgpu_force_sg_display; +MODULE_PARM_DESC(force_sg_display, "Force S/G display (0 = off (default), 1 = force display to use GTT) "); +module_param_named(force_sg_display, amdgpu_force_sg_display, int, 0444); + /* These devices are not supported by amdgpu. * They are supported by the mach64, r128, radeon drivers */ diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c index 981010de0a28..840190dd78e4 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c @@ -1516,6 +1516,9 @@ uint32_t amdgpu_bo_get_preferred_domain(struct amdgpu_device *adev, if (adev->gmc.real_vram_size <= AMDGPU_SG_THRESHOLD) domain = AMDGPU_GEM_DOMAIN_GTT; } + if ((domain == (AMDGPU_GEM_DOMAIN_VRAM | AMDGPU_GEM_DOMAIN_GTT)) && + amdgpu_force_sg_display && adev->mode_info.gpu_vm_support) + domain = AMDGPU_GEM_DOMAIN_GTT; return domain; } -- 2.39.1
