v3d: Introduce a DRM shim for calling out to the simulator.

The goal is to enable testing of parts of drivers without depending on any
particular kernel version or hardware being present.

Simply set LD_PRELOAD=$PREFIX/lib/libv3d_drm_shim.so in your environment,
and we'll fake a /dev/dri/renderD128 (or whatever the next available node
is) using v3dv3.  That node can then be used with the surfaceless or gbm
EGL platforms.

Acked-by: Iago Toral Quiroga <[email protected]>

1 files changed, 98 insertions, 0 deletions

diff --git a/src/broadcom/drm-shim/v3d.c b/src/broadcom/drm-shim/v3d.c
new file mode 100644
index 00000000000..e75657f59f7
--- /dev/null
+++ b/src/broadcom/drm-shim/v3d.c
@@ -0,0 +1,98 @@
+/*
+ * Copyright © 2018 Broadcom
+ *
+ * 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 <stdio.h>
+#include <sys/ioctl.h>
+#include "drm-uapi/v3d_drm.h"
+#include "drm-shim/drm_shim.h"
+#include "v3d.h"
+#include "v3d_simulator_wrapper.h"
+
+static struct v3d_device_info devinfo;
+struct v3d_shim_device v3d = {
+        .devinfo = &devinfo
+};
+
+struct v3d_bo *v3d_bo_lookup(struct shim_fd *shim_fd, int handle)
+{
+        return v3d_bo(drm_shim_bo_lookup(shim_fd, handle));
+}
+
+int
+v3d_ioctl_wait_bo(int fd, unsigned long request, void *arg)
+{
+        /* No need to wait on anything yet, given that we submit
+         * synchronously.
+         */
+        return 0;
+}
+
+int
+v3d_ioctl_mmap_bo(int fd, unsigned long request, void *arg)
+{
+        struct shim_fd *shim_fd = drm_shim_fd_lookup(fd);
+        struct drm_v3d_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;
+}
+
+int
+v3d_ioctl_get_bo_offset(int fd, unsigned long request, void *arg)
+{
+        struct shim_fd *shim_fd = drm_shim_fd_lookup(fd);
+        struct drm_v3d_get_bo_offset *get = arg;
+        struct v3d_bo *bo = v3d_bo_lookup(shim_fd, get->handle);
+
+        get->offset = bo->offset;
+
+        drm_shim_bo_put(&bo->base);
+
+        return 0;
+}
+
+void
+drm_shim_driver_init(void)
+{
+        shim_device.driver_name = "v3d";
+
+        drm_shim_override_file("OF_FULLNAME=/rdb/v3d\n"
+                               "OF_COMPATIBLE_N=1\n"
+                               "OF_COMPATIBLE_0=brcm,7278-v3d\n",
+                               "/sys/dev/char/%d:%d/device/uevent",
+                               DRM_MAJOR, render_node_minor);
+
+        v3d.hw = v3d_hw_auto_new(NULL);
+        v3d.devinfo->ver = v3d_hw_get_version(v3d.hw);
+
+        if (v3d.devinfo->ver >= 42)
+                v3d42_drm_shim_driver_init();
+        else if (v3d.devinfo->ver >= 41)
+                v3d41_drm_shim_driver_init();
+        else
+                v3d33_drm_shim_driver_init();
+}