Re: [PATCH v2 1/1] drm/amdgpu: Enable scatter gather display support

Christian König
2018-03-28T07:46:29Z

Am 28.03.2018 um 00:22 schrieb Samuel Li:
> It's auto by default. For CZ/ST, auto setting enables sg display
> when vram size is small; otherwise still uses vram.
> This patch fixed some potential hang issue introduced by change
> "allow framebuffer in GART memory as well" due to CZ/ST hardware
> limitation.

Well that is still a NAK.

As discussed now multiple times please implement the necessary changes
in Mesa.

Regards,
Christian.

>
> v2: Change default setting to auto, also some misc changes.
> Signed-off-by: Samuel Li <Samuel.Li@amd.com>
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu.h | 1 +
> drivers/gpu/drm/amd/amdgpu/amdgpu_display.c | 10 ++++++++--
> drivers/gpu/drm/amd/amdgpu/amdgpu_display.h | 2 ++
> drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 4 ++++
> drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c | 2 ++
> drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 3 ++-
> 6 files changed, 19 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> index a7e2229..c942362 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> @@ -129,6 +129,7 @@ extern int amdgpu_lbpw;
> extern int amdgpu_compute_multipipe;
> extern int amdgpu_gpu_recovery;
> extern int amdgpu_emu_mode;
> +extern int amdgpu_sg_display;
>
> #ifdef CONFIG_DRM_AMDGPU_SI
> extern int amdgpu_si_support;
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
> index 5495b29..1e7b950 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
> @@ -513,8 +513,14 @@ uint32_t amdgpu_display_framebuffer_domains(struct amdgpu_device *adev)
> #if defined(CONFIG_DRM_AMD_DC)
> if (adev->asic_type >= CHIP_CARRIZO && adev->asic_type < CHIP_RAVEN &&
> adev->flags & AMD_IS_APU &&
> - amdgpu_device_asic_has_dc_support(adev->asic_type))
> - domain |= AMDGPU_GEM_DOMAIN_GTT;
> + amdgpu_device_asic_has_dc_support(adev->asic_type)) {
> + if (amdgpu_sg_display == 1)
> + domain = AMDGPU_GEM_DOMAIN_GTT;
> + else if (amdgpu_sg_display == -1) {
> + if (adev->gmc.real_vram_size < AMDGPU_SG_THRESHOLD)
> + domain = AMDGPU_GEM_DOMAIN_GTT;
> + }
> + }
> #endif
>
> return domain;
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.h
> index 2b11d80..2b25393 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.h
> @@ -23,6 +23,8 @@
> #ifndef __AMDGPU_DISPLAY_H__
> #define __AMDGPU_DISPLAY_H__
>
> +#define AMDGPU_SG_THRESHOLD (256*1024*1024)
> +
> uint32_t amdgpu_display_framebuffer_domains(struct amdgpu_device *adev);
> struct drm_framebuffer *
> amdgpu_display_user_framebuffer_create(struct drm_device *dev,
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> index 1bfce79..19f11a5 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> @@ -132,6 +132,7 @@ int amdgpu_lbpw = -1;
> int amdgpu_compute_multipipe = -1;
> int amdgpu_gpu_recovery = -1; /* auto */
> int amdgpu_emu_mode = 0;
> +int amdgpu_sg_display = -1;
>
> MODULE_PARM_DESC(vramlimit, "Restrict VRAM for testing, in megabytes");
> module_param_named(vramlimit, amdgpu_vram_limit, int, 0600);
> @@ -290,6 +291,9 @@ module_param_named(gpu_recovery, amdgpu_gpu_recovery, int, 0444);
> MODULE_PARM_DESC(emu_mode, "Emulation mode, (1 = enable, 0 = disable)");
> module_param_named(emu_mode, amdgpu_emu_mode, int, 0444);
>
> +MODULE_PARM_DESC(sg_display, "Enable scatter gather display, (1 = enable, 0 = disable, -1 = auto");
> +module_param_named(sg_display, amdgpu_sg_display, int, 0444);
> +
> #ifdef CONFIG_DRM_AMDGPU_SI
>
> #if defined(CONFIG_DRM_RADEON) || defined(CONFIG_DRM_RADEON_MODULE)
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c
> index 1206301..f57c355 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c
> @@ -138,6 +138,8 @@ static int amdgpufb_create_pinned_object(struct amdgpu_fbdev *rfbdev,
> mode_cmd->pitches[0] = amdgpu_align_pitch(adev, mode_cmd->width, cpp,
> fb_tiled);
> domain = amdgpu_display_framebuffer_domains(adev);
> + if (domain & AMDGPU_GEM_DOMAIN_GTT)
> + DRM_DEBUG_DRIVER("Scatter gather display: enabled\n");
>
> height = ALIGN(mode_cmd->height, 8);
> size = mode_cmd->pitches[0] * height;
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> index 68ab325..7e9f247 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> @@ -3074,7 +3074,8 @@ static int dm_plane_helper_prepare_fb(struct drm_plane *plane,
> domain = AMDGPU_GEM_DOMAIN_VRAM;
>
> r = amdgpu_bo_pin(rbo, domain, &afb->address);
> -
> + rbo->preferred_domains = domain;
> + rbo->allowed_domains = domain;
> amdgpu_bo_unreserve(rbo);
>
> if (unlikely(r != 0)) {