Add drm_panic support, for nv50+ cards.
It's enough to get the panic screen while running Gnome/Wayland on a
GTX 1650.
It doesn't support multi-plane or compressed format.
Support for other formats and older cards will come later.
Tiling is only tested on GTX1650, and might be wrong for other cards.
Signed-off-by: Jocelyn Falempe <jfalempe@xxxxxxxxxx>
---
v2:
* Rebase and drop already merged patches.
* Rework the tiling algorithm, using "swizzle" to compute the offset
inside the block.
drivers/gpu/drm/nouveau/dispnv50/wndw.c | 107 +++++++++++++++++++++++-
1 file changed, 105 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/nouveau/dispnv50/wndw.c b/drivers/gpu/drm/nouveau/dispnv50/wndw.c
index 7a2cceaee6e9..50ecf6f12b81 100644
--- a/drivers/gpu/drm/nouveau/dispnv50/wndw.c
+++ b/drivers/gpu/drm/nouveau/dispnv50/wndw.c
@@ -30,11 +30,16 @@
#include <nvhw/class/cl507e.h>
#include <nvhw/class/clc37e.h>
+#include <linux/iosys-map.h>
+
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_blend.h>
-#include <drm/drm_gem_atomic_helper.h>
#include <drm/drm_fourcc.h>
+#include <drm/drm_framebuffer.h>
+#include <drm/drm_gem_atomic_helper.h>
+#include <drm/drm_panic.h>
+#include <drm/ttm/ttm_bo.h>
#include "nouveau_bo.h"
#include "nouveau_gem.h"
@@ -577,6 +582,93 @@ nv50_wndw_prepare_fb(struct drm_plane *plane, struct drm_plane_state *state)
return 0;
}
+#define NV_TILE_BLK_BASE_HEIGHT 8 /* In pixel */
+#define NV_TILE_GOB_SIZE 64 /* In bytes */
+#define NV_TILE_BLK_WIDTH (NV_TILE_GOB_SIZE / 4) /* For 32 bits pixel */
+
+/* get the offset in bytes inside the framebuffer, after taking tiling into account */
+static unsigned int nv50_get_tiled_offset(struct drm_scanout_buffer *sb, unsigned int blk_h,
+ unsigned int x, unsigned int y)
+{
+ u32 blk_x, blk_y, blk_sz, blk_off, pitch;
+ u32 swizzle;
+
+ blk_sz = NV_TILE_GOB_SIZE * blk_h;
+ pitch = DIV_ROUND_UP(sb->width, NV_TILE_BLK_WIDTH);
+
+ /* block coordinate */
+ blk_x = x / NV_TILE_BLK_WIDTH;
+ blk_y = y / blk_h;
+
+ blk_off = ((blk_y * pitch) + blk_x) * blk_sz;
+
+ y = y % blk_h;
+
+ /* Inside the block, use the fast address swizzle to compute the offset
+ * For nvidia blocklinear, bit order is yn..y3 x3 y2 x2 y1 y0 x1 x0
+ */
+ swizzle = (x & 3) | (y & 3) << 2 | (x & 4) << 2 | (y & 4) << 3;
+ swizzle |= (x & 8) << 3 | (y >> 3) << 7;
+
+ return blk_off + swizzle * 4;
+}
+
+static void nv50_set_pixel(struct drm_scanout_buffer *sb, unsigned int x, unsigned int y, u32 color)
+{
+ struct drm_framebuffer *fb = sb->private;
+ unsigned int off;
+ /* According to DRM_FORMAT_MOD_NVIDIA_BLOCK_LINEAR_2D documentation,
+ * the last 4 bits of the modifier is log2(blk_height / NV_TILE_BLK_BASE_HEIGHT)
+ */
+ unsigned int blk_h = NV_TILE_BLK_BASE_HEIGHT * (1 << (fb->modifier & 0xf));
+
+ off = nv50_get_tiled_offset(sb, blk_h, x, y);
+ iosys_map_wr(&sb->map[0], off, u32, color);
+}
+
+static int
+nv50_wndw_get_scanout_buffer(struct drm_plane *plane, struct drm_scanout_buffer *sb)
+{
+ struct drm_framebuffer *fb;
+ struct nouveau_bo *nvbo;
+
+ if (!plane->state || !plane->state->fb)
+ return -EINVAL;
+
+ fb = plane->state->fb;
+ nvbo = nouveau_gem_object(fb->obj[0]);
+
+ /* Don't support compressed format, or multiplane yet. */
+ if (nvbo->comp || fb->format->num_planes != 1)
+ return -EOPNOTSUPP;
+
+ if (nouveau_bo_map(nvbo)) {
+ pr_warn("nouveau bo map failed, panic won't be displayed\n");
+ return -ENOMEM;
+ }
+
+ if (nvbo->kmap.bo_kmap_type & TTM_BO_MAP_IOMEM_MASK)
+ iosys_map_set_vaddr_iomem(&sb->map[0], nvbo->kmap.virtual);
+ else
+ iosys_map_set_vaddr(&sb->map[0], nvbo->kmap.virtual);
+
+ sb->height = fb->height;
+ sb->width = fb->width;
+ sb->pitch[0] = fb->pitches[0];
+ sb->format = fb->format;
+
+ /* If tiling is enabled, use the set_pixel() to display correctly.
+ * Only handle 32bits format for now.
+ */
+ if (fb->modifier & 0xf) {
+ if (fb->format->cpp[0] != 4)
+ return -EOPNOTSUPP;
+ sb->private = (void *) fb;
+ sb->set_pixel = nv50_set_pixel;
+ }
+ return 0;
+}
+
static const struct drm_plane_helper_funcs
nv50_wndw_helper = {
.prepare_fb = nv50_wndw_prepare_fb,
@@ -584,6 +676,14 @@ nv50_wndw_helper = {
.atomic_check = nv50_wndw_atomic_check,
};
+static const struct drm_plane_helper_funcs
+nv50_wndw_primary_helper = {
+ .prepare_fb = nv50_wndw_prepare_fb,
+ .cleanup_fb = nv50_wndw_cleanup_fb,
+ .atomic_check = nv50_wndw_atomic_check,
+ .get_scanout_buffer = nv50_wndw_get_scanout_buffer,
+};
+
static void
nv50_wndw_atomic_destroy_state(struct drm_plane *plane,
struct drm_plane_state *state)
@@ -732,7 +832,10 @@ nv50_wndw_new_(const struct nv50_wndw_func *func, struct drm_device *dev,
return ret;
}
- drm_plane_helper_add(&wndw->plane, &nv50_wndw_helper);
+ if (type == DRM_PLANE_TYPE_PRIMARY)
+ drm_plane_helper_add(&wndw->plane, &nv50_wndw_primary_helper);
+ else
+ drm_plane_helper_add(&wndw->plane, &nv50_wndw_helper);
if (wndw->func->ilut) {
ret = nv50_lut_init(disp, mmu, &wndw->ilut);
--
2.46.0
