panfrost: Move the batch submission logic to panfrost_batch_submit()

We are about to patch panfrost_flush() to flush all pending batches,
not only the current one. In order to do that, we need to move the
'flush single batch' code to panfrost_batch_submit().

While at it, we get rid of the existing pipelining logic, which is
currently unused and replace it by an unconditional wait at the end of
panfrost_batch_submit(). A new pipeline logic will be introduced later
on.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>

5 files changed, 127 insertions, 172 deletions

diff --git a/src/gallium/drivers/panfrost/pan_context.c b/src/gallium/drivers/panfrost/pan_context.c
index ed4bf6dca82..a063c16ab01 100644
--- a/src/gallium/drivers/panfrost/pan_context.c
+++ b/src/gallium/drivers/panfrost/pan_context.c
@@ -203,7 +203,7 @@ panfrost_attach_vt_framebuffer(struct panfrost_context *ctx)
 /* Reset per-frame context, called on context initialisation as well as after
  * flushing a frame */
 
-static void
+void
 panfrost_invalidate_frame(struct panfrost_context *ctx)
 {
         for (unsigned i = 0; i < PIPE_SHADER_TYPES; ++i)
@@ -1314,130 +1314,6 @@ panfrost_queue_draw(struct panfrost_context *ctx)
 
 /* The entire frame is in memory -- send it off to the kernel! */
 
-static void
-panfrost_submit_frame(struct panfrost_context *ctx, bool flush_immediate,
-                      struct panfrost_batch *batch)
-{
-        panfrost_batch_submit(batch);
-
-        /* If visual, we can stall a frame */
-
-        if (!flush_immediate)
-                panfrost_drm_force_flush_fragment(ctx);
-
-        ctx->last_fragment_flushed = false;
-        ctx->last_batch = batch;
-
-        /* If readback, flush now (hurts the pipelined performance) */
-        if (flush_immediate)
-                panfrost_drm_force_flush_fragment(ctx);
-}
-
-static void
-panfrost_draw_wallpaper(struct pipe_context *pipe)
-{
-        struct panfrost_context *ctx = pan_context(pipe);
-
-        /* Nothing to reload? TODO: MRT wallpapers */
-        if (ctx->pipe_framebuffer.cbufs[0] == NULL)
-                return;
-
-        /* Check if the buffer has any content on it worth preserving */
-
-        struct pipe_surface *surf = ctx->pipe_framebuffer.cbufs[0];
-        struct panfrost_resource *rsrc = pan_resource(surf->texture);
-        unsigned level = surf->u.tex.level;
-
-        if (!rsrc->slices[level].initialized)
-                return;
-
-        /* Save the batch */
-        struct panfrost_batch *batch = panfrost_get_batch_for_fbo(ctx);
-
-        ctx->wallpaper_batch = batch;
-
-        /* Clamp the rendering area to the damage extent. The
-         * KHR_partial_update() spec states that trying to render outside of
-         * the damage region is "undefined behavior", so we should be safe.
-         */
-        unsigned damage_width = (rsrc->damage.extent.maxx - rsrc->damage.extent.minx);
-        unsigned damage_height = (rsrc->damage.extent.maxy - rsrc->damage.extent.miny);
-
-        if (damage_width && damage_height) {
-                panfrost_batch_intersection_scissor(batch,
-                                                    rsrc->damage.extent.minx,
-                                                    rsrc->damage.extent.miny,
-                                                    rsrc->damage.extent.maxx,
-                                                    rsrc->damage.extent.maxy);
-        }
-
-        /* FIXME: Looks like aligning on a tile is not enough, but
-         * aligning on twice the tile size seems to works. We don't
-         * know exactly what happens here but this deserves extra
-         * investigation to figure it out.
-         */
-        batch->minx = batch->minx & ~((MALI_TILE_LENGTH * 2) - 1);
-        batch->miny = batch->miny & ~((MALI_TILE_LENGTH * 2) - 1);
-        batch->maxx = MIN2(ALIGN_POT(batch->maxx, MALI_TILE_LENGTH * 2),
-                           rsrc->base.width0);
-        batch->maxy = MIN2(ALIGN_POT(batch->maxy, MALI_TILE_LENGTH * 2),
-                           rsrc->base.height0);
-
-        struct pipe_scissor_state damage;
-        struct pipe_box rects[4];
-
-        /* Clamp the damage box to the rendering area. */
-        damage.minx = MAX2(batch->minx, rsrc->damage.biggest_rect.x);
-        damage.miny = MAX2(batch->miny, rsrc->damage.biggest_rect.y);
-        damage.maxx = MIN2(batch->maxx,
-                           rsrc->damage.biggest_rect.x +
-                           rsrc->damage.biggest_rect.width);
-        damage.maxy = MIN2(batch->maxy,
-                           rsrc->damage.biggest_rect.y +
-                           rsrc->damage.biggest_rect.height);
-
-        /* One damage rectangle means we can end up with at most 4 reload
-         * regions:
-         * 1: left region, only exists if damage.x > 0
-         * 2: right region, only exists if damage.x + damage.width < fb->width
-         * 3: top region, only exists if damage.y > 0. The intersection with
-         *    the left and right regions are dropped
-         * 4: bottom region, only exists if damage.y + damage.height < fb->height.
-         *    The intersection with the left and right regions are dropped
-         *
-         *                    ____________________________
-         *                    |       |     3     |      |
-         *                    |       |___________|      |
-         *                    |       |   damage  |      |
-         *                    |   1   |    rect   |   2  |
-         *                    |       |___________|      |
-         *                    |       |     4     |      |
-         *                    |_______|___________|______|
-         */
-        u_box_2d(batch->minx, batch->miny, damage.minx - batch->minx,
-                 batch->maxy - batch->miny, &rects[0]);
-        u_box_2d(damage.maxx, batch->miny, batch->maxx - damage.maxx,
-                 batch->maxy - batch->miny, &rects[1]);
-        u_box_2d(damage.minx, batch->miny, damage.maxx - damage.minx,
-                 damage.miny - batch->miny, &rects[2]);
-        u_box_2d(damage.minx, damage.maxy, damage.maxx - damage.minx,
-                 batch->maxy - damage.maxy, &rects[3]);
-
-        for (unsigned i = 0; i < 4; i++) {
-                /* Width and height are always >= 0 even if width is declared as a
-                 * signed integer: u_box_2d() helper takes unsigned args and
-                 * panfrost_set_damage_region() is taking care of clamping
-                 * negative values.
-                 */
-                if (!rects[i].width || !rects[i].height)
-                        continue;
-
-                /* Blit the wallpaper in */
-                panfrost_blit_wallpaper(ctx, &rects[i]);
-        }
-        ctx->wallpaper_batch = NULL;
-}
-
 void
 panfrost_flush(
         struct pipe_context *pipe,
@@ -1447,28 +1323,14 @@ panfrost_flush(
         struct panfrost_context *ctx = pan_context(pipe);
         struct panfrost_batch *batch = panfrost_get_batch_for_fbo(ctx);
 
-        /* Nothing to do! */
-        if (!batch->last_job.gpu && !batch->clear) return;
-
-        if (!batch->clear && batch->last_tiler.gpu)
-                panfrost_draw_wallpaper(&ctx->base);
-
-        /* Whether to stall the pipeline for immediately correct results. Since
-         * pipelined rendering is quite broken right now (to be fixed by the
-         * panfrost_job refactor, just take the perf hit for correctness) */
-        bool flush_immediate = /*flags & PIPE_FLUSH_END_OF_FRAME*/true;
-
         /* Submit the frame itself */
-        panfrost_submit_frame(ctx, flush_immediate, batch);
+        panfrost_batch_submit(batch);
 
         if (fence) {
                 struct panfrost_fence *f = panfrost_fence_create(ctx);
                 pipe->screen->fence_reference(pipe->screen, fence, NULL);
                 *fence = (struct pipe_fence_handle *)f;
         }
-
-        /* Prepare for the next frame */
-        panfrost_invalidate_frame(ctx);
 }
 
 #define DEFINE_CASE(c) case PIPE_PRIM_##c: return MALI_##c;
@@ -2854,9 +2716,6 @@ panfrost_create_context(struct pipe_screen *screen, void *priv, unsigned flags)
         assert(ctx->blitter);
         assert(ctx->blitter_wallpaper);
 
-        ctx->last_fragment_flushed = true;
-        ctx->last_batch = NULL;
-
         /* Prepare for render! */
 
         panfrost_batch_init(ctx);
diff --git a/src/gallium/drivers/panfrost/pan_context.h b/src/gallium/drivers/panfrost/pan_context.h
index e60f737360d..f0578d6808d 100644
--- a/src/gallium/drivers/panfrost/pan_context.h
+++ b/src/gallium/drivers/panfrost/pan_context.h
@@ -196,12 +196,6 @@ struct panfrost_context {
         bool is_t6xx;
 
         uint32_t out_sync;
-
-        /* While we're busy building up the job for frame N, the GPU is
-         * still busy executing frame N-1. So hold a reference to
-         * yesterjob */
-        int last_fragment_flushed;
-        struct panfrost_batch *last_batch;
 };
 
 /* Corresponds to the CSO */
@@ -304,6 +298,9 @@ struct pipe_context *
 panfrost_create_context(struct pipe_screen *screen, void *priv, unsigned flags);
 
 void
+panfrost_invalidate_frame(struct panfrost_context *ctx);
+
+void
 panfrost_emit_for_draw(struct panfrost_context *ctx, bool with_vertex_data);
 
 struct panfrost_transfer
diff --git a/src/gallium/drivers/panfrost/pan_drm.c b/src/gallium/drivers/panfrost/pan_drm.c
index f6ab9339057..8b8e38f0380 100644
--- a/src/gallium/drivers/panfrost/pan_drm.c
+++ b/src/gallium/drivers/panfrost/pan_drm.c
@@ -320,21 +320,6 @@ panfrost_fence_create(struct panfrost_context *ctx)
         return f;
 }
 
-void
-panfrost_drm_force_flush_fragment(struct panfrost_context *ctx)
-{
-        struct pipe_context *gallium = (struct pipe_context *) ctx;
-        struct panfrost_screen *screen = pan_screen(gallium->screen);
-
-        if (!ctx->last_fragment_flushed) {
-                drmSyncobjWait(screen->fd, &ctx->out_sync, 1, INT64_MAX, 0, NULL);
-                ctx->last_fragment_flushed = true;
-
-                /* The job finished up, so we're safe to clean it up now */
-                panfrost_free_batch(ctx->last_batch);
-        }
-}
-
 unsigned
 panfrost_drm_query_gpu_version(struct panfrost_screen *screen)
 {
diff --git a/src/gallium/drivers/panfrost/pan_job.c b/src/gallium/drivers/panfrost/pan_job.c
index 3d64aa8e452..00df9006342 100644
--- a/src/gallium/drivers/panfrost/pan_job.c
+++ b/src/gallium/drivers/panfrost/pan_job.c
@@ -163,6 +163,106 @@ panfrost_batch_get_polygon_list(struct panfrost_batch *batch, unsigned size)
         return batch->polygon_list->gpu;
 }
 
+static void
+panfrost_batch_draw_wallpaper(struct panfrost_batch *batch)
+{
+        /* Nothing to reload? TODO: MRT wallpapers */
+        if (batch->key.cbufs[0] == NULL)
+                return;
+
+        /* Check if the buffer has any content on it worth preserving */
+
+        struct pipe_surface *surf = batch->key.cbufs[0];
+        struct panfrost_resource *rsrc = pan_resource(surf->texture);
+        unsigned level = surf->u.tex.level;
+
+        if (!rsrc->slices[level].initialized)
+                return;
+
+        batch->ctx->wallpaper_batch = batch;
+
+        /* Clamp the rendering area to the damage extent. The
+         * KHR_partial_update() spec states that trying to render outside of
+         * the damage region is "undefined behavior", so we should be safe.
+         */
+        unsigned damage_width = (rsrc->damage.extent.maxx - rsrc->damage.extent.minx);
+        unsigned damage_height = (rsrc->damage.extent.maxy - rsrc->damage.extent.miny);
+
+        if (damage_width && damage_height) {
+                panfrost_batch_intersection_scissor(batch,
+                                                    rsrc->damage.extent.minx,
+                                                    rsrc->damage.extent.miny,
+                                                    rsrc->damage.extent.maxx,
+                                                    rsrc->damage.extent.maxy);
+        }
+
+        /* FIXME: Looks like aligning on a tile is not enough, but
+         * aligning on twice the tile size seems to works. We don't
+         * know exactly what happens here but this deserves extra
+         * investigation to figure it out.
+         */
+        batch->minx = batch->minx & ~((MALI_TILE_LENGTH * 2) - 1);
+        batch->miny = batch->miny & ~((MALI_TILE_LENGTH * 2) - 1);
+        batch->maxx = MIN2(ALIGN_POT(batch->maxx, MALI_TILE_LENGTH * 2),
+                           rsrc->base.width0);
+        batch->maxy = MIN2(ALIGN_POT(batch->maxy, MALI_TILE_LENGTH * 2),
+                           rsrc->base.height0);
+
+        struct pipe_scissor_state damage;
+        struct pipe_box rects[4];
+
+        /* Clamp the damage box to the rendering area. */
+        damage.minx = MAX2(batch->minx, rsrc->damage.biggest_rect.x);
+        damage.miny = MAX2(batch->miny, rsrc->damage.biggest_rect.y);
+        damage.maxx = MIN2(batch->maxx,
+                           rsrc->damage.biggest_rect.x +
+                           rsrc->damage.biggest_rect.width);
+        damage.maxy = MIN2(batch->maxy,
+                           rsrc->damage.biggest_rect.y +
+                           rsrc->damage.biggest_rect.height);
+
+        /* One damage rectangle means we can end up with at most 4 reload
+         * regions:
+         * 1: left region, only exists if damage.x > 0
+         * 2: right region, only exists if damage.x + damage.width < fb->width
+         * 3: top region, only exists if damage.y > 0. The intersection with
+         *    the left and right regions are dropped
+         * 4: bottom region, only exists if damage.y + damage.height < fb->height.
+         *    The intersection with the left and right regions are dropped
+         *
+         *                    ____________________________
+         *                    |       |     3     |      |
+         *                    |       |___________|      |
+         *                    |       |   damage  |      |
+         *                    |   1   |    rect   |   2  |
+         *                    |       |___________|      |
+         *                    |       |     4     |      |
+         *                    |_______|___________|______|
+         */
+        u_box_2d(batch->minx, batch->miny, damage.minx - batch->minx,
+                 batch->maxy - batch->miny, &rects[0]);
+        u_box_2d(damage.maxx, batch->miny, batch->maxx - damage.maxx,
+                 batch->maxy - batch->miny, &rects[1]);
+        u_box_2d(damage.minx, batch->miny, damage.maxx - damage.minx,
+                 damage.miny - batch->miny, &rects[2]);
+        u_box_2d(damage.minx, damage.maxy, damage.maxx - damage.minx,
+                 batch->maxy - damage.maxy, &rects[3]);
+
+        for (unsigned i = 0; i < 4; i++) {
+                /* Width and height are always >= 0 even if width is declared as a
+                 * signed integer: u_box_2d() helper takes unsigned args and
+                 * panfrost_set_damage_region() is taking care of clamping
+                 * negative values.
+                 */
+                if (!rects[i].width || !rects[i].height)
+                        continue;
+
+                /* Blit the wallpaper in */
+                panfrost_blit_wallpaper(batch->ctx, &rects[i]);
+        }
+        batch->ctx->wallpaper_batch = NULL;
+}
+
 void
 panfrost_batch_submit(struct panfrost_batch *batch)
 {
@@ -171,6 +271,13 @@ panfrost_batch_submit(struct panfrost_batch *batch)
         struct panfrost_context *ctx = batch->ctx;
         int ret;
 
+        /* Nothing to do! */
+        if (!batch->last_job.gpu && !batch->clear)
+                goto out;
+
+        if (!batch->clear && batch->last_tiler.gpu)
+                panfrost_batch_draw_wallpaper(batch);
+
         panfrost_scoreboard_link_batch(batch);
 
         bool has_draws = batch->last_job.gpu;
@@ -180,19 +287,28 @@ panfrost_batch_submit(struct panfrost_batch *batch)
         if (ret)
                 fprintf(stderr, "panfrost_batch_submit failed: %d\n", ret);
 
+out:
+        /* If this is the bound batch, the panfrost_context parameters are
+         * relevant so submitting it invalidates those paramaters, but if it's
+         * not bound, the context parameters are for some other batch so we
+         * can't invalidate them.
+         */
+        if (ctx->batch == batch)
+                panfrost_invalidate_frame(ctx);
+
         /* The job has been submitted, let's invalidate the current FBO job
          * cache.
 	 */
         assert(!ctx->batch || batch == ctx->batch);
         ctx->batch = NULL;
 
-        /* Remove the job from the ctx->batches set so that future
-         * panfrost_get_batch() calls don't see it.
-         * We must reset the job key to avoid removing another valid entry when
-         * the job is freed.
+        /* We always stall the pipeline for correct results since pipelined
+         * rendering is quite broken right now (to be fixed by the panfrost_job
+         * refactor, just take the perf hit for correctness)
          */
-        _mesa_hash_table_remove_key(ctx->batches, &batch->key);
-        memset(&batch->key, 0, sizeof(batch->key));
+        drmSyncobjWait(pan_screen(ctx->base.screen)->fd, &ctx->out_sync, 1,
+                       INT64_MAX, 0, NULL);
+        panfrost_free_batch(batch);
 }
 
 void
diff --git a/src/gallium/drivers/panfrost/pan_screen.h b/src/gallium/drivers/panfrost/pan_screen.h
index d20f150e3be..0124e559a70 100644
--- a/src/gallium/drivers/panfrost/pan_screen.h
+++ b/src/gallium/drivers/panfrost/pan_screen.h
@@ -133,8 +133,6 @@ int
 panfrost_drm_export_bo(struct panfrost_screen *screen, const struct panfrost_bo *bo);
 int
 panfrost_drm_submit_vs_fs_batch(struct panfrost_batch *batch, bool has_draws);
-void
-panfrost_drm_force_flush_fragment(struct panfrost_context *ctx);
 unsigned
 panfrost_drm_query_gpu_version(struct panfrost_screen *screen);
 int