[PATCH 6/6] drm/amd/display: add non-DC drm_panic support

[Alex Deucher]

Add support for the drm_panic module, which displays a pretty user
friendly message on the screen when a Linux kernel panic occurs.

Adapt Lu Yao's code to use common helpers derived from
Jocelyn's patch.  This extends the non-DC code to enable
access to non-CPU accessible VRAM and adds support for
other DCE versions.

Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
Cc: Lu Yao <yaolu at kylinos.cn>
Cc: Jocelyn Falempe <jfalempe at redhat.com>
Cc: Harry Wentland <harry.wentland at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/dce_v10_0.c | 27 ++++++++++++++++++++++++++
 drivers/gpu/drm/amd/amdgpu/dce_v11_0.c | 27 ++++++++++++++++++++++++++
 drivers/gpu/drm/amd/amdgpu/dce_v6_0.c  | 27 ++++++++++++++++++++++++++
 drivers/gpu/drm/amd/amdgpu/dce_v8_0.c  | 26 +++++++++++++++++++++++++
 4 files changed, 107 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c
index 8bc997b66424..c5e3d2251b18 100644
--- a/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c
@@ -2687,6 +2687,32 @@ static const struct drm_crtc_helper_funcs dce_v10_0_crtc_helper_funcs = {
 	.get_scanout_position = amdgpu_crtc_get_scanout_position,
 };
 
+static void dce_v10_0_panic_flush(struct drm_plane *plane)
+{
+	struct drm_framebuffer *fb;
+	struct amdgpu_crtc *amdgpu_crtc;
+	struct amdgpu_device *adev;
+	uint32_t fb_format;
+
+	if (!plane->fb)
+		return;
+
+	fb = plane->fb;
+	amdgpu_crtc = to_amdgpu_crtc(plane->crtc);
+	adev = drm_to_adev(fb->dev);
+
+	/* Disable DC tiling */
+	fb_format = RREG32(mmGRPH_CONTROL + amdgpu_crtc->crtc_offset);
+	fb_format &= ~GRPH_CONTROL__GRPH_ARRAY_MODE_MASK;
+	WREG32(mmGRPH_CONTROL + amdgpu_crtc->crtc_offset, fb_format);
+
+}
+
+static const struct drm_plane_helper_funcs dce_v10_0_drm_primary_plane_helper_funcs = {
+	.get_scanout_buffer = amdgpu_display_get_scanout_buffer,
+	.panic_flush = dce_v10_0_panic_flush,
+};
+
 static int dce_v10_0_crtc_init(struct amdgpu_device *adev, int index)
 {
 	struct amdgpu_crtc *amdgpu_crtc;
@@ -2734,6 +2760,7 @@ static int dce_v10_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_v10_0_crtc_helper_funcs);
+	drm_plane_helper_add(amdgpu_crtc->base.primary, &dce_v10_0_drm_primary_plane_helper_funcs);
 
 	return 0;
 }
diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c
index 504939e3c0c3..ea42a4472bf6 100644
--- a/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c
@@ -2800,6 +2800,32 @@ static const struct drm_crtc_helper_funcs dce_v11_0_crtc_helper_funcs = {
 	.get_scanout_position = amdgpu_crtc_get_scanout_position,
 };
 
+static void dce_v11_0_panic_flush(struct drm_plane *plane)
+{
+	struct drm_framebuffer *fb;
+	struct amdgpu_crtc *amdgpu_crtc;
+	struct amdgpu_device *adev;
+	uint32_t fb_format;
+
+	if (!plane->fb)
+		return;
+
+	fb = plane->fb;
+	amdgpu_crtc = to_amdgpu_crtc(plane->crtc);
+	adev = drm_to_adev(fb->dev);
+
+	/* Disable DC tiling */
+	fb_format = RREG32(mmGRPH_CONTROL + amdgpu_crtc->crtc_offset);
+	fb_format &= ~GRPH_CONTROL__GRPH_ARRAY_MODE_MASK;
+	WREG32(mmGRPH_CONTROL + amdgpu_crtc->crtc_offset, fb_format);
+
+}
+
+static const struct drm_plane_helper_funcs dce_v11_0_drm_primary_plane_helper_funcs = {
+	.get_scanout_buffer = amdgpu_display_get_scanout_buffer,
+	.panic_flush = dce_v11_0_panic_flush,
+};
+
 static int dce_v11_0_crtc_init(struct amdgpu_device *adev, int index)
 {
 	struct amdgpu_crtc *amdgpu_crtc;
@@ -2847,6 +2873,7 @@ static int dce_v11_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_v11_0_crtc_helper_funcs);
+	drm_plane_helper_add(amdgpu_crtc->base.primary, &dce_v11_0_drm_primary_plane_helper_funcs);
 
 	return 0;
 }
diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c
index a33e33743a93..915804a6a1d7 100644
--- a/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c
@@ -2602,6 +2602,32 @@ static const struct drm_crtc_helper_funcs dce_v6_0_crtc_helper_funcs = {
 	.get_scanout_position = amdgpu_crtc_get_scanout_position,
 };
 
+static void dce_v6_0_panic_flush(struct drm_plane *plane)
+{
+	struct drm_framebuffer *fb;
+	struct amdgpu_crtc *amdgpu_crtc;
+	struct amdgpu_device *adev;
+	uint32_t fb_format;
+
+	if (!plane->fb)
+		return;
+
+	fb = plane->fb;
+	amdgpu_crtc = to_amdgpu_crtc(plane->crtc);
+	adev = drm_to_adev(fb->dev);
+
+	/* 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);
+
+}
+
+static const struct drm_plane_helper_funcs dce_v6_0_drm_primary_plane_helper_funcs = {
+	.get_scanout_buffer = amdgpu_display_get_scanout_buffer,
+	.panic_flush = dce_v6_0_panic_flush,
+};
+
 static int dce_v6_0_crtc_init(struct amdgpu_device *adev, int index)
 {
 	struct amdgpu_crtc *amdgpu_crtc;
@@ -2629,6 +2655,7 @@ 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;
 }
diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c
index aff58d56864a..f2edc0fece5b 100644
--- a/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c
@@ -2613,6 +2613,31 @@ static const struct drm_crtc_helper_funcs dce_v8_0_crtc_helper_funcs = {
 	.get_scanout_position = amdgpu_crtc_get_scanout_position,
 };
 
+static void dce_v8_0_panic_flush(struct drm_plane *plane)
+{
+	struct drm_framebuffer *fb;
+	struct amdgpu_crtc *amdgpu_crtc;
+	struct amdgpu_device *adev;
+	uint32_t fb_format;
+
+	if (!plane->fb)
+		return;
+
+	fb = plane->fb;
+	amdgpu_crtc = to_amdgpu_crtc(plane->crtc);
+	adev = drm_to_adev(fb->dev);
+
+	/* Disable DC tiling */
+	fb_format = RREG32(mmGRPH_CONTROL + amdgpu_crtc->crtc_offset);
+	fb_format &= ~GRPH_CONTROL__GRPH_ARRAY_MODE_MASK;
+	WREG32(mmGRPH_CONTROL + amdgpu_crtc->crtc_offset, fb_format);
+}
+
+static const struct drm_plane_helper_funcs dce_v8_0_drm_primary_plane_helper_funcs = {
+	.get_scanout_buffer = amdgpu_display_get_scanout_buffer,
+	.panic_flush = dce_v8_0_panic_flush,
+};
+
 static int dce_v8_0_crtc_init(struct amdgpu_device *adev, int index)
 {
 	struct amdgpu_crtc *amdgpu_crtc;
@@ -2640,6 +2665,7 @@ static int dce_v8_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_v8_0_crtc_helper_funcs);
+	drm_plane_helper_add(amdgpu_crtc->base.primary, &dce_v8_0_drm_primary_plane_helper_funcs);
 
 	return 0;
 }
-- 
2.47.0