On 17/09/2024 15:21, Alex Deucher wrote:
On Mon, Aug 12, 2024 at 2:10 AM Lu Yao <yaolu@xxxxxxxxxx> wrote:
Add support for the drm_panic module, which displays a pretty user
friendly message on the screen when a Linux kernel panic occurs.
Signed-off-by: Lu Yao <yaolu@xxxxxxxxxx>
Patch looks good to me. Any chance you want to convert the other
non-DC dce files (dce_v8_0.c, dce_v10_0.c, dce_v11_0.c) while you are
at it?
I've made a similar patch in amdgpu_dm_plane.c, and it works on a Radeon
pro w6400.
But it only works when I'm in a VT terminal (so the framebuffer is
linear and CPU accessible).
When under Gnome/Wayland, the flag AMDGPU_GEM_CREATE_NO_CPU_ACCESS is
set, so that means I can't vmap it ?
Also I don't know if there is a similar way to disable
tiling/compression on this hardware.
Best regards,
--
Jocelyn
Alex
---
Changes in v2:
1. Drop include "drm_internal.h"
2. Add disabling DC tiling ops.
Per suggestion from previous thread:
https://patchwork.freedesktop.org/patch/606879/?series=136832&rev=1
---
drivers/gpu/drm/amd/amdgpu/dce_v6_0.c | 48 +++++++++++++++++++++++++++
1 file changed, 48 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c
index 05c0df97f01d..ba1b7a36caa3 100644
--- a/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c
@@ -28,6 +28,7 @@
#include <drm/drm_modeset_helper.h>
#include <drm/drm_modeset_helper_vtables.h>
#include <drm/drm_vblank.h>
+#include <drm/drm_panic.h>
#include "amdgpu.h"
#include "amdgpu_pm.h"
@@ -2600,6 +2601,52 @@ static const struct drm_crtc_helper_funcs dce_v6_0_crtc_helper_funcs = {
.get_scanout_position = amdgpu_crtc_get_scanout_position,
};
+static int dce_v6_0_drm_primary_plane_get_scanout_buffer(struct drm_plane *plane,
+ struct drm_scanout_buffer *sb)
+{
+ struct drm_framebuffer *fb;
+ struct amdgpu_bo *abo;
+ struct amdgpu_crtc *amdgpu_crtc;
+ struct amdgpu_device *adev;
+ uint32_t fb_format;
+
+ if (!plane->fb)
+ return -EINVAL;
+
+ fb = plane->fb;
+
+ abo = gem_to_amdgpu_bo(fb->obj[0]);
+ amdgpu_crtc = to_amdgpu_crtc(plane->crtc);
+ adev = drm_to_adev(fb->dev);
+
+ if (!abo->kmap.virtual &&
+ ttm_bo_kmap(&abo->tbo, 0, PFN_UP(abo->tbo.base.size), &abo->kmap)) {
+ DRM_WARN("amdgpu bo map failed, panic won't be displayed\n");
+ return -ENOMEM;
+ }
+
+ if (abo->kmap.bo_kmap_type & TTM_BO_MAP_IOMEM_MASK)
+ iosys_map_set_vaddr_iomem(&sb->map[0], abo->kmap.virtual);
+ else
+ iosys_map_set_vaddr(&sb->map[0], abo->kmap.virtual);
+
+ sb->width = fb->width;
+ sb->height = fb->height;
+ sb->format = fb->format;
+ sb->pitch[0] = fb->pitches[0];
+
+ /* Disable DC tiling */
+ fb_format = RREG32(mmGRPH_CONTROL + amdgpu_crtc->crtc_offset);
+ fb_format &= ~GRPH_ARRAY_MODE(0x7);
+ WREG32(mmGRPH_CONTROL + amdgpu_crtc->crtc_offset, fb_format);
+
+ return 0;
+}
+
+static const struct drm_plane_helper_funcs dce_v6_0_drm_primary_plane_helper_funcs = {
+ .get_scanout_buffer = dce_v6_0_drm_primary_plane_get_scanout_buffer
+};
+
static int dce_v6_0_crtc_init(struct amdgpu_device *adev, int index)
{
struct amdgpu_crtc *amdgpu_crtc;
@@ -2627,6 +2674,7 @@ static int dce_v6_0_crtc_init(struct amdgpu_device *adev, int index)
amdgpu_crtc->encoder = NULL;
amdgpu_crtc->connector = NULL;
drm_crtc_helper_add(&amdgpu_crtc->base, &dce_v6_0_crtc_helper_funcs);
+ drm_plane_helper_add(amdgpu_crtc->base.primary, &dce_v6_0_drm_primary_plane_helper_funcs);
return 0;
}
--
2.25.1
