[Mesa-dev] [PATCH v2 26/37] panfrost: Use the per-batch fences to wait on the last submitted batch

[Boris Brezillon]

We just replace the per-context out_sync object by a pointer to the
the fence of the last last submitted batch. Pipelining of batches will
come later.

Signed-off-by: Boris Brezillon <boris.brezillon at collabora.com>
---
 src/gallium/drivers/panfrost/pan_context.c |  6 ------
 src/gallium/drivers/panfrost/pan_context.h |  3 ++-
 src/gallium/drivers/panfrost/pan_job.c     | 23 ++++++++++++++++------
 src/gallium/drivers/panfrost/pan_screen.c  |  6 ++++--
 4 files changed, 23 insertions(+), 15 deletions(-)

diff --git a/src/gallium/drivers/panfrost/pan_context.c b/src/gallium/drivers/panfrost/pan_context.c
index a76caecef0e3..0197f78b5506 100644
--- a/src/gallium/drivers/panfrost/pan_context.c
+++ b/src/gallium/drivers/panfrost/pan_context.c
@@ -2712,12 +2712,6 @@ panfrost_create_context(struct pipe_screen *screen, void *priv, unsigned flags)
         panfrost_blend_context_init(gallium);
         panfrost_compute_context_init(gallium);
 
-        ASSERTED int ret;
-
-        ret = drmSyncobjCreate(pscreen->fd, DRM_SYNCOBJ_CREATE_SIGNALED,
-                               &ctx->out_sync);
-        assert(!ret);
-
         /* XXX: leaks */
         gallium->stream_uploader = u_upload_create_default(gallium);
         gallium->const_uploader = gallium->stream_uploader;
diff --git a/src/gallium/drivers/panfrost/pan_context.h b/src/gallium/drivers/panfrost/pan_context.h
index c145d589757e..ce3e0c899a4f 100644
--- a/src/gallium/drivers/panfrost/pan_context.h
+++ b/src/gallium/drivers/panfrost/pan_context.h
@@ -191,7 +191,8 @@ struct panfrost_context {
         /* True for t6XX, false for t8xx. */
         bool is_t6xx;
 
-        uint32_t out_sync;
+        /* The out sync fence of the last submitted batch. */
+        struct panfrost_batch_fence *last_out_sync;
 };
 
 /* Corresponds to the CSO */
diff --git a/src/gallium/drivers/panfrost/pan_job.c b/src/gallium/drivers/panfrost/pan_job.c
index 8712e2ce598a..78f2b766adb1 100644
--- a/src/gallium/drivers/panfrost/pan_job.c
+++ b/src/gallium/drivers/panfrost/pan_job.c
@@ -427,11 +427,13 @@ panfrost_batch_submit_ioctl(struct panfrost_batch *batch,
         uint32_t *bo_handles;
         int ret;
 
-        submit.in_syncs = (u64) (uintptr_t) &ctx->out_sync;
-        submit.in_sync_count = 1;
 
-        submit.out_sync = ctx->out_sync;
+        if (ctx->last_out_sync) {
+                submit.in_sync_count = 1;
+                submit.in_syncs = (uintptr_t)&ctx->last_out_sync->syncobj;
+        }
 
+        submit.out_sync = batch->out_sync->syncobj;
         submit.jc = first_job_desc;
         submit.requirements = reqs;
 
@@ -454,6 +456,14 @@ panfrost_batch_submit_ioctl(struct panfrost_batch *batch,
         submit.bo_handles = (u64) (uintptr_t) bo_handles;
         ret = drmIoctl(screen->fd, DRM_IOCTL_PANFROST_SUBMIT, &submit);
         free(bo_handles);
+
+        /* Release the last batch fence if any, and retain the new one */
+        if (ctx->last_out_sync)
+                panfrost_batch_fence_unreference(ctx->last_out_sync);
+
+        panfrost_batch_fence_reference(batch->out_sync);
+        ctx->last_out_sync = batch->out_sync;
+
         if (ret) {
                 fprintf(stderr, "Error submitting: %m\n");
                 return errno;
@@ -462,7 +472,8 @@ panfrost_batch_submit_ioctl(struct panfrost_batch *batch,
         /* Trace the job if we're doing that */
         if (pan_debug & PAN_DBG_TRACE) {
                 /* Wait so we can get errors reported back */
-                drmSyncobjWait(screen->fd, &ctx->out_sync, 1, INT64_MAX, 0, NULL);
+                drmSyncobjWait(screen->fd, &batch->out_sync->syncobj, 1,
+                               INT64_MAX, 0, NULL);
                 pandecode_jc(submit.jc, FALSE);
         }
 
@@ -531,8 +542,8 @@ out:
          * rendering is quite broken right now (to be fixed by the panfrost_job
          * refactor, just take the perf hit for correctness)
          */
-        drmSyncobjWait(pan_screen(ctx->base.screen)->fd, &ctx->out_sync, 1,
-                       INT64_MAX, 0, NULL);
+        drmSyncobjWait(pan_screen(ctx->base.screen)->fd,
+                       &batch->out_sync->syncobj, 1, INT64_MAX, 0, NULL);
         panfrost_free_batch(batch);
 }
 
diff --git a/src/gallium/drivers/panfrost/pan_screen.c b/src/gallium/drivers/panfrost/pan_screen.c
index dae8b941f1ea..22f7feb890e2 100644
--- a/src/gallium/drivers/panfrost/pan_screen.c
+++ b/src/gallium/drivers/panfrost/pan_screen.c
@@ -590,8 +590,8 @@ panfrost_fence_finish(struct pipe_screen *pscreen,
         struct panfrost_screen *screen = pan_screen(pscreen);
         struct panfrost_fence *f = (struct panfrost_fence *)fence;
         int ret;
-
         unsigned syncobj;
+
         ret = drmSyncobjCreate(screen->fd, 0, &syncobj);
         if (ret) {
                 fprintf(stderr, "Failed to create syncobj to wait on: %m\n");
@@ -623,12 +623,14 @@ panfrost_fence_create(struct panfrost_context *ctx)
         if (!f)
                 return NULL;
 
+        assert(ctx->last_out_sync);
+
         /* Snapshot the last Panfrost's rendering's out fence.  We'd rather have
          * another syncobj instead of a sync file, but this is all we get.
          * (HandleToFD/FDToHandle just gives you another syncobj ID for the
          * same syncobj).
          */
-        drmSyncobjExportSyncFile(screen->fd, ctx->out_sync, &f->fd);
+        drmSyncobjExportSyncFile(screen->fd, ctx->last_out_sync->syncobj, &f->fd);
         if (f->fd == -1) {
                 fprintf(stderr, "export failed: %m\n");
                 free(f);
-- 
2.21.0