[Mesa-dev] [PATCH v2] intel/blorp: Emit VF cache invalidates for 48-bit bugs with softpin.

[Kenneth Graunke]

commit 92f01fc5f914fd500497d0c3aed75f3ac8dc054d made i965 start emitting
VF cache invalidates when the high bits of vertex buffers change.  But
we were not tracking vertex buffers emitted by BLORP.  This was papered
over by a mistake where I emitted VF cache invalidates all the time,
which Chris fixed in commit 3ac5fbadfd8644d30fce9ff267cb811ad157996a.

This patch adds a new hook which allows the driver to track addresses
and request a VF cache invalidate as appropriate.

v2: Make the driver do the PIPE_CONTROL so it can apply workarounds
    (caught by Jason Ekstrand).  Rebase on anv bug fix.

Fixes: 92f01fc5f914 ("i965: Emit VF cache invalidates for 48-bit addressing bugs with softpin.")
---
 src/intel/blorp/blorp_genX_exec.h           | 17 +++++++++----
 src/intel/vulkan/genX_blorp_exec.c          | 10 ++++++++
 src/mesa/drivers/dri/i965/genX_blorp_exec.c | 28 +++++++++++++++++++++
 3 files changed, 50 insertions(+), 5 deletions(-)

diff --git a/src/intel/blorp/blorp_genX_exec.h b/src/intel/blorp/blorp_genX_exec.h
index bcaef4f367c..4800c7dcaaf 100644
--- a/src/intel/blorp/blorp_genX_exec.h
+++ b/src/intel/blorp/blorp_genX_exec.h
@@ -59,6 +59,10 @@ blorp_alloc_dynamic_state(struct blorp_batch *batch,
 static void *
 blorp_alloc_vertex_buffer(struct blorp_batch *batch, uint32_t size,
                           struct blorp_address *addr);
+static void
+blorp_vf_invalidate_for_vb_48b_transitions(struct blorp_batch *batch,
+                                           const struct blorp_address *addrs,
+                                           unsigned num_vbs);
 
 #if GEN_GEN >= 8
 static struct blorp_address
@@ -334,19 +338,22 @@ blorp_emit_vertex_buffers(struct blorp_batch *batch,
    uint32_t num_vbs = 2;
    memset(vb, 0, sizeof(vb));
 
-   struct blorp_address addr;
+   struct blorp_address addrs[2] = {};
    uint32_t size;
-   blorp_emit_vertex_data(batch, params, &addr, &size);
-   blorp_fill_vertex_buffer_state(batch, vb, 0, addr, size, 3 * sizeof(float));
+   blorp_emit_vertex_data(batch, params, &addrs[0], &size);
+   blorp_fill_vertex_buffer_state(batch, vb, 0, addrs[0], size,
+                                  3 * sizeof(float));
 
-   blorp_emit_input_varying_data(batch, params, &addr, &size);
-   blorp_fill_vertex_buffer_state(batch, vb, 1, addr, size, 0);
+   blorp_emit_input_varying_data(batch, params, &addrs[1], &size);
+   blorp_fill_vertex_buffer_state(batch, vb, 1, addrs[1], size, 0);
 
    const unsigned num_dwords = 1 + num_vbs * GENX(VERTEX_BUFFER_STATE_length);
    uint32_t *dw = blorp_emitn(batch, GENX(3DSTATE_VERTEX_BUFFERS), num_dwords);
    if (!dw)
       return;
 
+   blorp_vf_invalidate_for_vb_48b_transitions(batch, addrs, num_vbs);
+
    for (unsigned i = 0; i < num_vbs; i++) {
       GENX(VERTEX_BUFFER_STATE_pack)(batch, dw, &vb[i]);
       dw += GENX(VERTEX_BUFFER_STATE_length);
diff --git a/src/intel/vulkan/genX_blorp_exec.c b/src/intel/vulkan/genX_blorp_exec.c
index ecca3928de5..2035017ce0e 100644
--- a/src/intel/vulkan/genX_blorp_exec.c
+++ b/src/intel/vulkan/genX_blorp_exec.c
@@ -158,6 +158,16 @@ blorp_alloc_vertex_buffer(struct blorp_batch *batch, uint32_t size,
    return vb_state.map;
 }
 
+static void
+blorp_vf_invalidate_for_vb_48b_transitions(struct blorp_batch *batch,
+                                           const struct blorp_address *addrs,
+                                           unsigned num_vbs)
+{
+   /* anv forces all vertex buffers into the low 4GB so there are never any
+    * transitions that require a VF invalidation.
+    */
+}
+
 #if GEN_GEN >= 8
 static struct blorp_address
 blorp_get_workaround_page(struct blorp_batch *batch)
diff --git a/src/mesa/drivers/dri/i965/genX_blorp_exec.c b/src/mesa/drivers/dri/i965/genX_blorp_exec.c
index 808bff0db85..13f8abebb47 100644
--- a/src/mesa/drivers/dri/i965/genX_blorp_exec.c
+++ b/src/mesa/drivers/dri/i965/genX_blorp_exec.c
@@ -189,6 +189,34 @@ blorp_alloc_vertex_buffer(struct blorp_batch *batch, uint32_t size,
    return data;
 }
 
+/**
+ * See vf_invalidate_for_vb_48b_transitions in genX_state_upload.c.
+ */
+static void
+blorp_vf_invalidate_for_vb_48b_transitions(struct blorp_batch *batch,
+                                           const struct blorp_address *addrs,
+                                           unsigned num_vbs)
+{
+#if GEN_GEN >= 8
+   struct brw_context *brw = batch->driver_batch;
+   bool need_invalidate = false;
+
+   for (unsigned i = 0; i < num_vbs; i++) {
+      struct brw_bo *bo = addrs[i].buffer;
+      uint16_t high_bits =
+         bo && (bo->kflags & EXEC_OBJECT_PINNED) ? bo->gtt_offset >> 32u : 0;
+
+      if (high_bits != brw->vb.last_bo_high_bits[i]) {
+         brw->vb.last_bo_high_bits[i] = high_bits;
+      }
+   }
+
+   if (need_invalidate) {
+      brw_emit_pipe_control_flush(brw, PIPE_CONTROL_VF_CACHE_INVALIDATE);
+   }
+#endif
+}
+
 #if GEN_GEN >= 8
 static struct blorp_address
 blorp_get_workaround_page(struct blorp_batch *batch)
-- 
2.17.0