vc4: add drm-shim

Is enought to run shader-db.

Signed-off-by: Christian Gmeiner <christian.gmeiner@gmail.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8736>

src/broadcom/drm-shim/README.md

@@ -15,3 +15,13 @@ The submit ioctl is stubbed out to not execute anything.
 Export `MESA_LOADER_DRIVER_OVERRIDE=v3d
 LD_PRELOAD=$prefix/lib/libv3d_noop_drm_shim.so`.  This will be a V3D
 4.2 device.
+
+### vc4_noop backend
+
+This implements the minimum of vc4 in order to make shader-db work.
+The submit ioctl is stubbed out to not execute anything.
+
+Export `MESA_LOADER_DRIVER_OVERRIDE=vc4
+LD_PRELOAD=$prefix/lib/libvc4_noop_drm_shim.so`.  This will be a VC4
+2.1 device.
+

src/broadcom/drm-shim/meson.build

@@ -18,6 +18,15 @@
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 # SOFTWARE.
 
+libvc4_noop_drm_shim = shared_library(
+  ['vc4_noop_drm_shim'],
+  'vc4_noop.c',
+  include_directories: [inc_include, inc_src, inc_mapi, inc_mesa, inc_gallium, inc_gallium_aux],
+  dependencies: dep_drm_shim,
+  gnu_symbol_visibility : 'hidden',
+  install : true,
+)
+
 libv3d_noop_drm_shim = shared_library(
   ['v3d_noop_drm_shim'],
   'v3d_noop.c',

src/broadcom/drm-shim/vc4_noop.c

@@ -0,0 +1,123 @@
+/*
+ * Copyright (c) 2021 Etnaviv Project
+ *
+ * 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 <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/ioctl.h>
+#include "drm-uapi/vc4_drm.h"
+#include "drm-shim/drm_shim.h"
+
+bool drm_shim_driver_prefers_first_render_node = true;
+
+static int
+vc4_ioctl_noop(int fd, unsigned long request, void *arg)
+{
+        return 0;
+}
+
+static int
+vc4_ioctl_create_bo(int fd, unsigned long request, void *arg)
+{
+        struct shim_fd *shim_fd = drm_shim_fd_lookup(fd);
+        struct drm_vc4_create_bo *create = arg;
+        struct shim_bo *bo = calloc(1, sizeof(*bo));
+
+        drm_shim_bo_init(bo, create->size);
+        create->handle = drm_shim_bo_get_handle(shim_fd, bo);
+        drm_shim_bo_put(bo);
+
+        return 0;
+}
+
+static int
+vc4_ioctl_mmap_bo(int fd, unsigned long request, void *arg)
+{
+        struct shim_fd *shim_fd = drm_shim_fd_lookup(fd);
+        struct drm_vc4_mmap_bo *map = arg;
+        struct shim_bo *bo = drm_shim_bo_lookup(shim_fd, map->handle);
+
+        map->offset = drm_shim_bo_get_mmap_offset(shim_fd, bo);
+
+        drm_shim_bo_put(bo);
+
+        return 0;
+}
+
+static int
+vc4_ioctl_get_param(int fd, unsigned long request, void *arg)
+{
+        struct drm_vc4_get_param *gp = arg;
+        static const uint32_t param_map[] = {
+                [DRM_VC4_PARAM_V3D_IDENT0] = 0x2000000,
+                [DRM_VC4_PARAM_V3D_IDENT1] = 0x0000001,
+        };
+
+        switch (gp->param) {
+        case DRM_VC4_PARAM_SUPPORTS_BRANCHES:
+        case DRM_VC4_PARAM_SUPPORTS_ETC1:
+        case DRM_VC4_PARAM_SUPPORTS_THREADED_FS:
+        case DRM_VC4_PARAM_SUPPORTS_FIXED_RCL_ORDER:
+                gp->value = 1;
+                return 0;
+
+        case DRM_VC4_PARAM_SUPPORTS_MADVISE:
+        case DRM_VC4_PARAM_SUPPORTS_PERFMON:
+                gp->value = 0;
+                return 0;
+
+        default:
+                break;
+        }
+
+        if (gp->param < ARRAY_SIZE(param_map) && param_map[gp->param]) {
+                gp->value = param_map[gp->param];
+                return 0;
+        }
+
+        fprintf(stderr, "Unknown DRM_IOCTL_VC4_GET_PARAM %d\n", gp->param);
+        return -1;
+}
+
+static ioctl_fn_t driver_ioctls[] = {
+        [DRM_VC4_CREATE_BO] = vc4_ioctl_create_bo,
+        [DRM_VC4_MMAP_BO] = vc4_ioctl_mmap_bo,
+        [DRM_VC4_GET_PARAM] = vc4_ioctl_get_param,
+        [DRM_VC4_GET_TILING] = vc4_ioctl_noop,
+        [DRM_VC4_LABEL_BO] = vc4_ioctl_noop,
+};
+
+void
+drm_shim_driver_init(void)
+{
+        shim_device.bus_type = DRM_BUS_PLATFORM;
+        shim_device.driver_name = "vc4";
+        shim_device.driver_ioctls = driver_ioctls;
+        shim_device.driver_ioctl_count = ARRAY_SIZE(driver_ioctls);
+
+        drm_shim_override_file("OF_FULLNAME=/rdb/vc4\n"
+                               "OF_COMPATIBLE_N=1\n"
+                               "OF_COMPATIBLE_0=brcm,7278-vc4\n",
+                               "/sys/dev/char/%d:%d/device/uevent",
+                               DRM_MAJOR, render_node_minor);
+}