clover: Pass buffer offsets to the driver in set_global_binding() v3

The offsets will be stored in the handles parameter.  This makes
it possible to use sub-buffers.

v2:
  - Style fixes
  - Add support for constant sub-buffers
  - Store handles in device byte order

v3:
  - Use endian helpers

Reviewed-by: Francisco Jerez <currojerez@riseup.net>

src/gallium/drivers/r600/evergreen_compute.c

@@ -662,10 +662,15 @@ static void evergreen_set_global_binding(
 
 	for (int i = 0; i < n; i++)
 	{
+		uint32_t buffer_offset;
+		uint32_t handle;
 		assert(resources[i]->target == PIPE_BUFFER);
 		assert(resources[i]->bind & PIPE_BIND_GLOBAL);
 
-		*(handles[i]) = buffers[i]->chunk->start_in_dw * 4;
+		buffer_offset = util_le32_to_cpu(*(handles[i]));
+		handle = buffer_offset + buffers[i]->chunk->start_in_dw * 4;
+
+		*(handles[i]) = util_cpu_to_le32(handle);
 	}
 
 	evergreen_set_rat(ctx->cs_shader_state.shader, 0, pool->bo, 0, pool->size_in_dw * 4);

src/gallium/drivers/radeonsi/si_compute.c

@@ -107,8 +107,12 @@ static void si_set_global_binding(
 
 	for (i = first; i < first + n; i++) {
 		uint64_t va;
+		uint32_t offset;
 		program->global_buffers[i] = resources[i];
 		va = r600_resource_va(ctx->screen, resources[i]);
+		offset = util_le32_to_cpu(*handles[i]);
+		va += offset;
+		va = util_cpu_to_le64(va);
 		memcpy(handles[i], &va, sizeof(va));
 	}
 }

src/gallium/include/pipe/p_context.h

@@ -460,11 +460,14 @@ struct pipe_context {
     *                   unless it's NULL, in which case no new
     *                   resources will be bound.
     * \param handles    array of pointers to the memory locations that
-    *                   will be filled with the respective base
-    *                   addresses each buffer will be mapped to.  It
-    *                   should contain at least \a count elements,
-    *                   unless \a resources is NULL in which case \a
-    *                   handles should be NULL as well.
+    *                   will be updated with the address each buffer
+    *                   will be mapped to.  The base memory address of
+    *                   each of the buffers will be added to the value
+    *                   pointed to by its corresponding handle to form
+    *                   the final address argument.  It should contain
+    *                   at least \a count elements, unless \a
+    *                   resources is NULL in which case \a handles
+    *                   should be NULL as well.
     *
     * Note that the driver isn't required to make any guarantees about
     * the contents of the \a handles array being valid anytime except

src/gallium/state_trackers/clover/core/kernel.cpp

@@ -337,8 +337,17 @@ kernel::global_argument::bind(exec_context &ctx,
    align(ctx.input, marg.target_align);
 
    if (buf) {
-      ctx.g_handles.push_back(allocate(ctx.input, marg.target_size));
-      ctx.g_buffers.push_back(buf->resource(*ctx.q).pipe);
+      const resource &r = buf->resource(*ctx.q);
+      ctx.g_handles.push_back(ctx.input.size());
+      ctx.g_buffers.push_back(r.pipe);
+
+      // How to handle multi-demensional offsets?
+      // We don't need to.  Buffer offsets are always
+      // one-dimensional.
+      auto v = bytes(r.offset[0]);
+      extend(v, marg.ext_type, marg.target_size);
+      byteswap(v, ctx.q->device().endianness());
+      insert(ctx.input, v);
    } else {
       // Null pointer.
       allocate(ctx.input, marg.target_size);
@@ -395,13 +404,14 @@ kernel::constant_argument::bind(exec_context &ctx,
    align(ctx.input, marg.target_align);
 
    if (buf) {
-      auto v = bytes(ctx.resources.size() << 24);
+      resource &r = buf->resource(*ctx.q);
+      auto v = bytes(ctx.resources.size() << 24 | r.offset[0]);
 
       extend(v, module::argument::zero_ext, marg.target_size);
       byteswap(v, ctx.q->device().endianness());
       insert(ctx.input, v);
 
-      st = buf->resource(*ctx.q).bind_surface(*ctx.q, false);
+      st = r.bind_surface(*ctx.q, false);
       ctx.resources.push_back(st);
    } else {
       // Null pointer.