panfrost: Legalize resource when attaching to a batch

Make sure we don't convert the texture for nothing by only
legalizing when creating a batch instead of on surface creation.
Also, to avoid recursive blit, we need to legalize the destination
resource before blitting.

Finally, make sure the resource has a sparse memory layout if
AFBC compressed. The GPU doesn't support rendering to a AFBC-packed
texture.

Signed-off-by: Louis-Francis Ratté-Boulianne <lfrb@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/25012>

src/gallium/drivers/panfrost/pan_blit.c

@@ -90,6 +90,10 @@ panfrost_blit(struct pipe_context *pipe, const struct pipe_blit_info *info)
    if (!util_blitter_is_blit_supported(ctx->blitter, info))
       unreachable("Unsupported blit\n");
 
+   /* Legalize here because it could trigger a recursive blit otherwise */
+   pan_legalize_afbc_format(ctx, pan_resource(info->dst.resource),
+                            info->dst.format, true);
+
    panfrost_blitter_save(ctx, info->render_condition_enable
                                  ? PAN_RENDER_BLIT_COND
                                  : PAN_RENDER_BLIT);

src/gallium/drivers/panfrost/pan_cmdstream.c

@@ -4224,7 +4224,8 @@ panfrost_create_sampler_view(struct pipe_context *pctx,
    struct panfrost_sampler_view *so =
       rzalloc(pctx, struct panfrost_sampler_view);
 
-   pan_legalize_afbc_format(ctx, pan_resource(texture), template->format);
+   pan_legalize_afbc_format(ctx, pan_resource(texture), template->format,
+                            false);
 
    pipe_reference(NULL, &texture->reference);
 

src/gallium/drivers/panfrost/pan_job.c

@@ -68,6 +68,7 @@ panfrost_batch_add_surface(struct panfrost_batch *batch,
 {
    if (surf) {
       struct panfrost_resource *rsrc = pan_resource(surf->texture);
+      pan_legalize_afbc_format(batch->ctx, rsrc, surf->format, true);
       panfrost_batch_write_rsrc(batch, rsrc, PIPE_SHADER_FRAGMENT);
    }
 }

src/gallium/drivers/panfrost/pan_resource.c

@@ -257,11 +257,8 @@ static struct pipe_surface *
 panfrost_create_surface(struct pipe_context *pipe, struct pipe_resource *pt,
                         const struct pipe_surface *surf_tmpl)
 {
-   struct panfrost_context *ctx = pan_context(pipe);
    struct pipe_surface *ps = NULL;
 
-   pan_legalize_afbc_format(ctx, pan_resource(pt), surf_tmpl->format);
-
    ps = CALLOC_STRUCT(pipe_surface);
 
    if (ps) {
@@ -1180,7 +1177,8 @@ pan_resource_modifier_convert(struct panfrost_context *ctx,
 {
    assert(!rsrc->modifier_constant);
 
-   perf_debug_ctx(ctx, "Disabling AFBC with a blit. Reason: %s", reason);
+   perf_debug_ctx(ctx, "%s AFBC with a blit. Reason: %s",
+                  drm_is_afbc(modifier) ? "Unpacking" : "Disabling", reason);
 
    struct pipe_resource *tmp_prsrc = panfrost_resource_create_with_modifier(
       ctx->base.screen, &rsrc->base, modifier);
@@ -1228,20 +1226,25 @@ pan_resource_modifier_convert(struct panfrost_context *ctx,
 void
 pan_legalize_afbc_format(struct panfrost_context *ctx,
                          struct panfrost_resource *rsrc,
-                         enum pipe_format format)
+                         enum pipe_format format, bool write)
 {
    struct panfrost_device *dev = pan_device(ctx->base.screen);
 
    if (!drm_is_afbc(rsrc->image.layout.modifier))
       return;
 
-   if (panfrost_afbc_format(dev->arch, rsrc->base.format) ==
-       panfrost_afbc_format(dev->arch, format))
+   if (panfrost_afbc_format(dev->arch, rsrc->base.format) !=
+       panfrost_afbc_format(dev->arch, format)) {
+      pan_resource_modifier_convert(
+         ctx, rsrc, DRM_FORMAT_MOD_ARM_16X16_BLOCK_U_INTERLEAVED,
+         "Reinterpreting AFBC surface as incompatible format");
       return;
+   }
 
-   pan_resource_modifier_convert(
-      ctx, rsrc, DRM_FORMAT_MOD_ARM_16X16_BLOCK_U_INTERLEAVED,
-      "Reinterpreting AFBC surface as incompatible format");
+   if (write && (rsrc->image.layout.modifier & AFBC_FORMAT_MOD_SPARSE) == 0)
+      pan_resource_modifier_convert(
+         ctx, rsrc, rsrc->image.layout.modifier | AFBC_FORMAT_MOD_SPARSE,
+         "Legalizing resource to allow writing");
 }
 
 static bool

src/gallium/drivers/panfrost/pan_resource.h

@@ -190,6 +190,6 @@ void pan_resource_modifier_convert(struct panfrost_context *ctx,
 
 void pan_legalize_afbc_format(struct panfrost_context *ctx,
                               struct panfrost_resource *rsrc,
-                              enum pipe_format format);
+                              enum pipe_format format, bool write);
 
 #endif /* PAN_RESOURCE_H */