anv: Add a helper for doing buffer copies with nothing but VF and SOL.

This method of doing copies has the advantage of touching very little of
the GPU state.  While it does disable all the shader stages, it doesn't
have to blow away binding tables, viewports, scissors, or any other bits of
dynamic state other than VBO 32 which is already reserved.  All of the
state that it does touch is contained within a pipeline anyway so that's
the only thing that has to be dirtied.

Signed-off-by: Jason Ekstrand <[email protected]>
Reviewed-by: Topi Pohjolainen <[email protected]>

3 files changed, 239 insertions, 0 deletions

diff --git a/src/intel/vulkan/Makefile.sources b/src/intel/vulkan/Makefile.sources
index a97d47e4cc1..d81bc032c59 100644
--- a/src/intel/vulkan/Makefile.sources
+++ b/src/intel/vulkan/Makefile.sources
@@ -65,6 +65,7 @@ VULKAN_GENERATED_FILES := \
 GEN7_FILES := \
 	genX_cmd_buffer.c \
 	genX_blorp_exec.c \
+	genX_gpu_memcpy.c \
 	genX_pipeline.c \
 	gen7_cmd_buffer.c \
 	genX_state.c
@@ -72,6 +73,7 @@ GEN7_FILES := \
 GEN75_FILES := \
 	genX_cmd_buffer.c \
 	genX_blorp_exec.c \
+	genX_gpu_memcpy.c \
 	genX_pipeline.c \
 	gen7_cmd_buffer.c \
 	genX_state.c
@@ -79,6 +81,7 @@ GEN75_FILES := \
 GEN8_FILES := \
 	genX_cmd_buffer.c \
 	genX_blorp_exec.c \
+	genX_gpu_memcpy.c \
 	genX_pipeline.c \
 	gen8_cmd_buffer.c \
 	genX_state.c
@@ -86,6 +89,7 @@ GEN8_FILES := \
 GEN9_FILES := \
 	genX_cmd_buffer.c \
 	genX_blorp_exec.c \
+	genX_gpu_memcpy.c \
 	genX_pipeline.c \
 	gen8_cmd_buffer.c \
 	genX_state.c
diff --git a/src/intel/vulkan/anv_genX.h b/src/intel/vulkan/anv_genX.h
index 5bb2a613b77..793717012b6 100644
--- a/src/intel/vulkan/anv_genX.h
+++ b/src/intel/vulkan/anv_genX.h
@@ -62,5 +62,10 @@ genX(emit_urb_setup)(struct anv_device *device, struct anv_batch *batch,
 void genX(cmd_buffer_emit_hz_op)(struct anv_cmd_buffer *cmd_buffer,
                                enum blorp_hiz_op op);
 
+void genX(cmd_buffer_gpu_memcpy)(struct anv_cmd_buffer *cmd_buffer,
+                                 struct anv_bo *dst, uint32_t dst_offset,
+                                 struct anv_bo *src, uint32_t src_offset,
+                                 uint32_t size);
+
 void genX(blorp_exec)(struct blorp_batch *batch,
                       const struct blorp_params *params);
diff --git a/src/intel/vulkan/genX_gpu_memcpy.c b/src/intel/vulkan/genX_gpu_memcpy.c
new file mode 100644
index 00000000000..10751b0a35e
--- /dev/null
+++ b/src/intel/vulkan/genX_gpu_memcpy.c
@@ -0,0 +1,230 @@
+/*
+ * Copyright © 2016 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include "anv_private.h"
+
+#include "genxml/gen_macros.h"
+#include "genxml/genX_pack.h"
+
+#include "common/gen_l3_config.h"
+
+/**
+ * This file implements some lightweight memcpy/memset operations on the GPU
+ * using a vertex buffer and streamout.
+ */
+
+/**
+ * Returns the greatest common divisor of a and b that is a power of two.
+ */
+static inline uint64_t
+gcd_pow2_u64(uint64_t a, uint64_t b)
+{
+   assert(a > 0 || b > 0);
+
+   unsigned a_log2 = ffsll(a) - 1;
+   unsigned b_log2 = ffsll(b) - 1;
+
+   /* If either a or b is 0, then a_log2 or b_log2 will be UINT_MAX in which
+    * case, the MIN2() will take the other one.  If both are 0 then we will
+    * hit the assert above.
+    */
+   return 1 << MIN2(a_log2, b_log2);
+}
+
+void
+genX(cmd_buffer_gpu_memcpy)(struct anv_cmd_buffer *cmd_buffer,
+                            struct anv_bo *dst, uint32_t dst_offset,
+                            struct anv_bo *src, uint32_t src_offset,
+                            uint32_t size)
+{
+   if (size == 0)
+      return;
+
+   assert(dst_offset + size <= dst->size);
+   assert(src_offset + size <= src->size);
+
+   /* The maximum copy block size is 4 32-bit components at a time. */
+   unsigned bs = 16;
+   bs = gcd_pow2_u64(bs, src_offset);
+   bs = gcd_pow2_u64(bs, dst_offset);
+   bs = gcd_pow2_u64(bs, size);
+
+   enum isl_format format;
+   switch (bs) {
+   case 4:  format = ISL_FORMAT_R32_UINT;          break;
+   case 8:  format = ISL_FORMAT_R32G32_UINT;       break;
+   case 16: format = ISL_FORMAT_R32G32B32A32_UINT; break;
+   default:
+      unreachable("Invalid size");
+   }
+
+   if (!cmd_buffer->state.current_l3_config) {
+      const struct gen_l3_config *cfg =
+         gen_get_default_l3_config(&cmd_buffer->device->info);
+      genX(cmd_buffer_config_l3)(cmd_buffer, cfg);
+   }
+
+   genX(cmd_buffer_apply_pipe_flushes)(cmd_buffer);
+
+   genX(flush_pipeline_select_3d)(cmd_buffer);
+
+   uint32_t *dw;
+   dw = anv_batch_emitn(&cmd_buffer->batch, 5, GENX(3DSTATE_VERTEX_BUFFERS));
+   GENX(VERTEX_BUFFER_STATE_pack)(&cmd_buffer->batch, dw + 1,
+      &(struct GENX(VERTEX_BUFFER_STATE)) {
+         .VertexBufferIndex = 32, /* Reserved for this */
+         .AddressModifyEnable = true,
+         .BufferStartingAddress = { src, src_offset },
+         .BufferPitch = bs,
+#if (GEN_GEN >= 8)
+         .MemoryObjectControlState = GENX(MOCS),
+         .BufferSize = size,
+#else
+         .VertexBufferMemoryObjectControlState = GENX(MOCS),
+         .EndAddress = { src, src_offset + size - 1 },
+#endif
+      });
+
+   dw = anv_batch_emitn(&cmd_buffer->batch, 3, GENX(3DSTATE_VERTEX_ELEMENTS));
+   GENX(VERTEX_ELEMENT_STATE_pack)(&cmd_buffer->batch, dw + 1,
+      &(struct GENX(VERTEX_ELEMENT_STATE)) {
+         .VertexBufferIndex = 32,
+         .Valid = true,
+         .SourceElementFormat = format,
+         .SourceElementOffset = 0,
+         .Component0Control = (bs >= 4) ? VFCOMP_STORE_SRC : VFCOMP_STORE_0,
+         .Component1Control = (bs >= 8) ? VFCOMP_STORE_SRC : VFCOMP_STORE_0,
+         .Component2Control = (bs >= 12) ? VFCOMP_STORE_SRC : VFCOMP_STORE_0,
+         .Component3Control = (bs >= 16) ? VFCOMP_STORE_SRC : VFCOMP_STORE_0,
+      });
+
+#if GEN_GEN >= 8
+   anv_batch_emit(&cmd_buffer->batch, GENX(3DSTATE_VF_SGVS), sgvs);
+#endif
+
+   /* Disable all shader stages */
+   anv_batch_emit(&cmd_buffer->batch, GENX(3DSTATE_VS), vs);
+   anv_batch_emit(&cmd_buffer->batch, GENX(3DSTATE_HS), hs);
+   anv_batch_emit(&cmd_buffer->batch, GENX(3DSTATE_TE), te);
+   anv_batch_emit(&cmd_buffer->batch, GENX(3DSTATE_DS), DS);
+   anv_batch_emit(&cmd_buffer->batch, GENX(3DSTATE_GS), gs);
+   anv_batch_emit(&cmd_buffer->batch, GENX(3DSTATE_PS), gs);
+
+   anv_batch_emit(&cmd_buffer->batch, GENX(3DSTATE_SBE), sbe) {
+      sbe.VertexURBEntryReadOffset = 1;
+      sbe.NumberofSFOutputAttributes = 1;
+      sbe.VertexURBEntryReadLength = 1;
+#if GEN_GEN >= 8
+      sbe.ForceVertexURBEntryReadLength = true;
+      sbe.ForceVertexURBEntryReadOffset = true;
+#endif
+
+#if GEN_GEN >= 9
+      for (unsigned i = 0; i < 32; i++)
+         sbe.AttributeActiveComponentFormat[i] = ACF_XYZW;
+#endif
+   }
+
+   /* Emit URB setup.  We tell it that the VS is active because we want it to
+    * allocate space for the VS.  Even though one isn't run, we need VUEs to
+    * store the data that VF is going to pass to SOL.
+    */
+   genX(emit_urb_setup)(cmd_buffer->device, &cmd_buffer->batch,
+                        VK_SHADER_STAGE_VERTEX_BIT, DIV_ROUND_UP(32, 64), 0,
+                        cmd_buffer->state.current_l3_config);
+
+   anv_batch_emit(&cmd_buffer->batch, GENX(3DSTATE_SO_BUFFER), sob) {
+      sob.SOBufferIndex = 0;
+      sob.SOBufferObjectControlState = GENX(MOCS);
+      sob.SurfaceBaseAddress = (struct anv_address) { dst, dst_offset };
+
+#if GEN_GEN >= 8
+      sob.SOBufferEnable = true;
+      sob.SurfaceSize = size - 1;
+#else
+      sob.SurfacePitch = bs;
+      sob.SurfaceEndAddress = sob.SurfaceBaseAddress;
+      sob.SurfaceEndAddress.offset += size;
+#endif
+
+#if GEN_GEN >= 8
+      /* As SOL writes out data, it updates the SO_WRITE_OFFSET registers with
+       * the end position of the stream.  We need to reset this value to 0 at
+       * the beginning of the run or else SOL will start at the offset from
+       * the previous draw.
+       */
+      sob.StreamOffsetWriteEnable = true;
+      sob.StreamOffset = 0;
+#endif
+   }
+
+#if GEN_GEN <= 7
+   /* The hardware can do this for us on BDW+ (see above) */
+   anv_batch_emit(&cmd_buffer->batch, GENX(MI_LOAD_REGISTER_IMM), load) {
+      load.RegisterOffset = GENX(SO_WRITE_OFFSET0_num);
+      load.DataDWord = 0;
+   }
+#endif
+
+   dw = anv_batch_emitn(&cmd_buffer->batch, 5, GENX(3DSTATE_SO_DECL_LIST),
+                        .StreamtoBufferSelects0 = (1 << 0),
+                        .NumEntries0 = 1);
+   GENX(SO_DECL_ENTRY_pack)(&cmd_buffer->batch, dw + 3,
+      &(struct GENX(SO_DECL_ENTRY)) {
+         .Stream0Decl = {
+            .OutputBufferSlot = 0,
+            .RegisterIndex = 0,
+            .ComponentMask = (1 << (bs / 4)) - 1,
+         },
+      });
+
+   anv_batch_emit(&cmd_buffer->batch, GENX(3DSTATE_STREAMOUT), so) {
+      so.SOFunctionEnable = true;
+      so.RenderingDisable = true;
+      so.Stream0VertexReadOffset = 0;
+      so.Stream0VertexReadLength = DIV_ROUND_UP(32, 64);
+#if GEN_GEN >= 8
+      so.Buffer0SurfacePitch = bs;
+#else
+      so.SOBufferEnable0 = true;
+#endif
+   }
+
+#if GEN_GEN >= 8
+   anv_batch_emit(&cmd_buffer->batch, GENX(3DSTATE_VF_TOPOLOGY), topo) {
+      topo.PrimitiveTopologyType = _3DPRIM_POINTLIST;
+   }
+#endif
+
+   anv_batch_emit(&cmd_buffer->batch, GENX(3DPRIMITIVE), prim) {
+      prim.VertexAccessType         = SEQUENTIAL;
+      prim.PrimitiveTopologyType    = _3DPRIM_POINTLIST;
+      prim.VertexCountPerInstance   = size / bs;
+      prim.StartVertexLocation      = 0;
+      prim.InstanceCount            = 1;
+      prim.StartInstanceLocation    = 0;
+      prim.BaseVertexLocation       = 0;
+   }
+
+   cmd_buffer->state.dirty |= ANV_CMD_DIRTY_PIPELINE;
+}