Mesa (master): panfrost: Add support for INTEL_blackhole_render

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Module: Mesa
Branch: master
Commit: f55649d20b4b0263245f047db6239a46890e04a4
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=f55649d20b4b0263245f047db6239a46890e04a4

Author: Icecream95 <ixn at disroot.org>
Date:   Thu Jan 21 16:22:35 2021 +1300

panfrost: Add support for INTEL_blackhole_render

Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig at collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8607>

---

 src/gallium/drivers/panfrost/pan_context.c | 9 +++++++++
 src/gallium/drivers/panfrost/pan_context.h | 2 ++
 src/gallium/drivers/panfrost/pan_job.c     | 5 ++++-
 src/gallium/drivers/panfrost/pan_screen.c  | 1 +
 4 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/src/gallium/drivers/panfrost/pan_context.c b/src/gallium/drivers/panfrost/pan_context.c
index 54a279ec35d..f8570149ee8 100644
--- a/src/gallium/drivers/panfrost/pan_context.c
+++ b/src/gallium/drivers/panfrost/pan_context.c
@@ -185,6 +185,14 @@ panfrost_texture_barrier(struct pipe_context *pipe, unsigned flags)
         panfrost_flush_all_batches(ctx);
 }
 
+static void
+panfrost_set_frontend_noop(struct pipe_context *pipe, bool enable)
+{
+        struct panfrost_context *ctx = pan_context(pipe);
+        panfrost_flush_all_batches(ctx);
+        ctx->is_noop = enable;
+}
+
 #define DEFINE_CASE(c) case PIPE_PRIM_##c: return MALI_DRAW_MODE_##c;
 
 static int
@@ -1583,6 +1591,7 @@ panfrost_create_context(struct pipe_screen *screen, void *priv, unsigned flags)
         gallium->clear = panfrost_clear;
         gallium->draw_vbo = panfrost_draw_vbo;
         gallium->texture_barrier = panfrost_texture_barrier;
+        gallium->set_frontend_noop = panfrost_set_frontend_noop;
 
         gallium->set_vertex_buffers = panfrost_set_vertex_buffers;
         gallium->set_constant_buffer = panfrost_set_constant_buffer;
diff --git a/src/gallium/drivers/panfrost/pan_context.h b/src/gallium/drivers/panfrost/pan_context.h
index a65442a88bb..39ee2186418 100644
--- a/src/gallium/drivers/panfrost/pan_context.h
+++ b/src/gallium/drivers/panfrost/pan_context.h
@@ -181,6 +181,8 @@ struct panfrost_context {
         struct panfrost_query *cond_query;
         bool cond_cond;
         enum pipe_render_cond_flag cond_mode;
+
+        bool is_noop;
 };
 
 /* Corresponds to the CSO */
diff --git a/src/gallium/drivers/panfrost/pan_job.c b/src/gallium/drivers/panfrost/pan_job.c
index 301ce459b21..32f3ff2bbdf 100644
--- a/src/gallium/drivers/panfrost/pan_job.c
+++ b/src/gallium/drivers/panfrost/pan_job.c
@@ -983,7 +983,10 @@ panfrost_batch_submit_ioctl(struct panfrost_batch *batch,
                 bo_handles[submit.bo_handle_count++] = dev->tiler_heap->gem_handle;
 
         submit.bo_handles = (u64) (uintptr_t) bo_handles;
-        ret = drmIoctl(dev->fd, DRM_IOCTL_PANFROST_SUBMIT, &submit);
+        if (ctx->is_noop)
+                ret = 0;
+        else
+                ret = drmIoctl(dev->fd, DRM_IOCTL_PANFROST_SUBMIT, &submit);
         free(bo_handles);
 
         if (ret) {
diff --git a/src/gallium/drivers/panfrost/pan_screen.c b/src/gallium/drivers/panfrost/pan_screen.c
index 83c23bfe026..49d2f1eb8d8 100644
--- a/src/gallium/drivers/panfrost/pan_screen.c
+++ b/src/gallium/drivers/panfrost/pan_screen.c
@@ -116,6 +116,7 @@ panfrost_get_param(struct pipe_screen *screen, enum pipe_cap param)
         case PIPE_CAP_DEPTH_CLIP_DISABLE_SEPARATE:
         case PIPE_CAP_MIXED_COLORBUFFER_FORMATS:
         case PIPE_CAP_MIXED_FRAMEBUFFER_SIZES:
+        case PIPE_CAP_FRONTEND_NOOP:
                 return 1;
 
         case PIPE_CAP_MAX_RENDER_TARGETS: