amd,radv: move SDMA utility helpers to common code

Only simple ones for now. Other functions need more rework.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/37881>

src/amd/common/ac_cmdbuf_sdma.c

@@ -0,0 +1,66 @@
+/*
+ * Copyright 2012 Advanced Micro Devices, Inc.
+ * Copyright 2025 Valve Corporation
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#include "ac_cmdbuf.h"
+#include "ac_cmdbuf_sdma.h"
+#include "sid.h"
+
+#include "util/u_math.h"
+
+void
+ac_emit_sdma_nop(struct ac_cmdbuf *cs)
+{
+   /* SDMA NOP acts as a fence command and causes the SDMA engine to wait for pending copy operations. */
+   ac_cmdbuf_begin(cs);
+   ac_cmdbuf_emit(SDMA_PACKET(SDMA_OPCODE_NOP, 0, 0));
+   ac_cmdbuf_end();
+}
+
+void
+ac_emit_sdma_write_timestamp(struct ac_cmdbuf *cs, uint64_t va)
+{
+   ac_cmdbuf_begin(cs);
+   ac_cmdbuf_emit(SDMA_PACKET(SDMA_OPCODE_TIMESTAMP, SDMA_TS_SUB_OPCODE_GET_GLOBAL_TIMESTAMP, 0));
+   ac_cmdbuf_emit(va);
+   ac_cmdbuf_emit(va >> 32);
+   ac_cmdbuf_end();
+}
+
+void
+ac_emit_sdma_fence(struct ac_cmdbuf *cs, uint64_t va, uint32_t fence)
+{
+   ac_cmdbuf_begin(cs);
+   ac_cmdbuf_emit(SDMA_PACKET(SDMA_OPCODE_FENCE, 0, SDMA_FENCE_MTYPE_UC));
+   ac_cmdbuf_emit(va);
+   ac_cmdbuf_emit(va >> 32);
+   ac_cmdbuf_emit(fence);
+   ac_cmdbuf_end();
+}
+
+void
+ac_emit_sdma_wait_mem(struct ac_cmdbuf *cs, uint32_t op, uint64_t va, uint32_t ref, uint32_t mask)
+{
+   ac_cmdbuf_begin(cs);
+   ac_cmdbuf_emit(SDMA_PACKET(SDMA_OPCODE_POLL_REGMEM, 0, 0) | op << 28 | SDMA_POLL_MEM);
+   ac_cmdbuf_emit(va);
+   ac_cmdbuf_emit(va >> 32);
+   ac_cmdbuf_emit(ref);
+   ac_cmdbuf_emit(mask);
+   ac_cmdbuf_emit(SDMA_POLL_INTERVAL_160_CLK | SDMA_POLL_RETRY_INDEFINITELY << 16);
+   ac_cmdbuf_end();
+}
+
+void
+ac_emit_sdma_write_data_head(struct ac_cmdbuf *cs, uint64_t va, uint32_t count)
+{
+   ac_cmdbuf_begin(cs);
+   ac_cmdbuf_emit(SDMA_PACKET(SDMA_OPCODE_WRITE, SDMA_WRITE_SUB_OPCODE_LINEAR, 0));
+   ac_cmdbuf_emit(va);
+   ac_cmdbuf_emit(va >> 32);
+   ac_cmdbuf_emit(count - 1);
+   ac_cmdbuf_end();
+}

src/amd/common/ac_cmdbuf_sdma.h

@@ -0,0 +1,31 @@
+/*
+ * Copyright 2012 Advanced Micro Devices, Inc.
+ * Copyright 2025 Valve Corporation
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#ifndef AC_CMDBUF_SDMA_H
+#define AC_CMDBUF_SDMA_H
+
+struct ac_cmdbuf;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void ac_emit_sdma_nop(struct ac_cmdbuf *cs);
+
+void ac_emit_sdma_write_timestamp(struct ac_cmdbuf *cs, uint64_t va);
+
+void ac_emit_sdma_fence(struct ac_cmdbuf *cs, uint64_t va, uint32_t fence);
+
+void ac_emit_sdma_wait_mem(struct ac_cmdbuf *cs, uint32_t op, uint64_t va, uint32_t ref, uint32_t mask);
+
+void ac_emit_sdma_write_data_head(struct ac_cmdbuf *cs, uint64_t va, uint32_t count);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

src/amd/common/meson.build

@@ -56,6 +56,8 @@ amd_common_files = files(
   'ac_binary.h',
   'ac_cmdbuf.c',
   'ac_cmdbuf.h',
+  'ac_cmdbuf_sdma.c',
+  'ac_cmdbuf_sdma.h',
   'ac_shader_args.c',
   'ac_shader_args.h',
   'ac_shader_util.c',