freedreno: Add support for drm-shim.

I'm using this for shader-db analysis on x86_64 systems.

Reviewed-by: Rob Clark <robdclark@gmail.com>

src/drm-shim/device.c

@@ -130,6 +130,10 @@ drm_shim_ioctl_version(int fd, unsigned long request, void *arg)
    const char *date = "20190320";
    const char *desc = "shim";
 
+   args->version_major = shim_device.version_major;
+   args->version_minor = shim_device.version_minor;
+   args->version_patchlevel = shim_device.version_patchlevel;
+
    if (args->name)
       strncpy(args->name, shim_device.driver_name, args->name_len);
    if (args->date)

src/drm-shim/drm_shim.h

@@ -43,6 +43,7 @@ struct shim_device {
 
    /* Returned by drmGetVersion(). */
    const char *driver_name;
+   int version_major, version_minor, version_patchlevel;
 };
 
 extern struct shim_device shim_device;

src/freedreno/drm-shim/README.md

@@ -0,0 +1,7 @@
+### freedreno_noop backend
+
+This implements the minimum of msm in order to make shader-db work.
+The submit ioctl is stubbed out to not execute anything.
+
+Export `MESA_LOADER_DRIVER_OVERRIDE=msm
+LD_PRELOAD=$prefix/lib/libfreedreno_noop_drm_shim.so`.

src/freedreno/drm-shim/freedreno_noop.c

@@ -0,0 +1,184 @@
+/*
+ * Copyright © 2019 Google LLC
+ *
+ * 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/msm_drm.h"
+#include "drm-shim/drm_shim.h"
+
+struct msm_bo {
+	struct shim_bo base;
+	uint32_t offset;
+};
+
+static struct msm_bo *
+msm_bo(struct shim_bo *bo)
+{
+	return (struct msm_bo *)bo;
+}
+
+struct msm_device {
+	uint32_t next_offset;
+};
+
+static struct msm_device msm = {
+	.next_offset = 0x1000,
+};
+
+static int
+msm_ioctl_noop(int fd, unsigned long request, void *arg)
+{
+	return 0;
+}
+
+static int
+msm_ioctl_gem_new(int fd, unsigned long request, void *arg)
+{
+	struct shim_fd *shim_fd = drm_shim_fd_lookup(fd);
+	struct drm_msm_gem_new *create = arg;
+	struct msm_bo *bo = calloc(1, sizeof(*bo));
+
+	drm_shim_bo_init(&bo->base, create->size);
+
+	assert(UINT_MAX - msm.next_offset > create->size);
+
+	bo->offset = msm.next_offset;
+	msm.next_offset += create->size;
+
+	create->handle = drm_shim_bo_get_handle(shim_fd, &bo->base);
+
+	drm_shim_bo_put(&bo->base);
+
+	return 0;
+}
+
+static int
+msm_ioctl_gem_info(int fd, unsigned long request, void *arg)
+{
+	struct shim_fd *shim_fd = drm_shim_fd_lookup(fd);
+	struct drm_msm_gem_info *args = arg;
+	struct shim_bo *bo = drm_shim_bo_lookup(shim_fd, args->handle);
+
+	switch (args->info) {
+	case MSM_INFO_GET_OFFSET:
+		args->value = drm_shim_bo_get_mmap_offset(shim_fd, bo);
+		return 0;
+	case MSM_INFO_GET_IOVA:
+		args->value = msm_bo(bo)->offset;
+		return 0;
+	case MSM_INFO_SET_NAME:
+		return 0;
+	default:
+		fprintf(stderr, "Unknown DRM_IOCTL_MSM_GEM_INFO %d\n", args->info);
+		return -1;
+	}
+
+	drm_shim_bo_put(bo);
+
+	return 0;
+}
+
+static int
+msm_ioctl_get_param(int fd, unsigned long request, void *arg)
+{
+	struct drm_msm_param *gp = arg;
+
+	switch (gp->param) {
+	case MSM_PARAM_GPU_ID:
+		gp->value = 630;
+		return 0;
+	case MSM_PARAM_GMEM_SIZE:
+		gp->value = 1024 * 1024;
+		return 0;
+	case MSM_PARAM_GMEM_BASE:
+		gp->value = 0x100000;
+		return 0;
+	case MSM_PARAM_CHIP_ID:
+		gp->value = (6 << 24) | (3 << 16) | (0 << 8) | (0xff << 0);
+		return 0;
+	case MSM_PARAM_NR_RINGS:
+		gp->value = 1;
+		return 0;
+	case MSM_PARAM_MAX_FREQ:
+		gp->value = 1000000;
+		return 0;
+	case MSM_PARAM_TIMESTAMP:
+		gp->value = 0;
+		return 0;
+	case MSM_PARAM_PP_PGTABLE:
+		gp->value = 1;
+		return 0;
+	case MSM_PARAM_FAULTS:
+		gp->value = 0;
+		return 0;
+	default:
+		fprintf(stderr, "Unknown DRM_IOCTL_MSM_GET_PARAM %d\n",
+				gp->param);
+		return -1;
+	}
+}
+
+static int
+msm_ioctl_gem_madvise(int fd, unsigned long request, void *arg)
+{
+	struct drm_msm_gem_madvise *args = arg;
+
+	args->retained = true;
+
+	return 0;
+}
+
+static ioctl_fn_t driver_ioctls[] = {
+	[DRM_MSM_GET_PARAM] = msm_ioctl_get_param,
+	[DRM_MSM_GEM_NEW] = msm_ioctl_gem_new,
+	[DRM_MSM_GEM_INFO] = msm_ioctl_gem_info,
+	[DRM_MSM_GEM_CPU_PREP] = msm_ioctl_noop,
+	[DRM_MSM_GEM_CPU_FINI] = msm_ioctl_noop,
+	[DRM_MSM_GEM_SUBMIT] = msm_ioctl_noop,
+	[DRM_MSM_WAIT_FENCE] = msm_ioctl_noop,
+	[DRM_MSM_GEM_MADVISE] = msm_ioctl_gem_madvise,
+	[DRM_MSM_SUBMITQUEUE_NEW] = msm_ioctl_noop,
+	[DRM_MSM_SUBMITQUEUE_CLOSE] = msm_ioctl_noop,
+	[DRM_MSM_SUBMITQUEUE_QUERY] = msm_ioctl_noop,
+};
+
+void
+drm_shim_driver_init(void)
+{
+	shim_device.driver_name = "msm";
+	shim_device.driver_ioctls = driver_ioctls;
+	shim_device.driver_ioctl_count = ARRAY_SIZE(driver_ioctls);
+
+	/* msm uses the DRM version to expose features, instead of getparam. */
+	shim_device.version_major = 1;
+	shim_device.version_minor = 5;
+	shim_device.version_patchlevel = 0;
+
+	drm_shim_override_file("OF_FULLNAME=/rdb/msm\n"
+			"OF_COMPATIBLE_N=1\n"
+			"OF_COMPATIBLE_0=qcom,adreno\n",
+			"/sys/dev/char/%d:%d/device/uevent",
+			DRM_MAJOR, render_node_minor);
+}

src/freedreno/drm-shim/meson.build

@@ -0,0 +1,29 @@
+# Copyright © 2019 Google LLC
+#
+# 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.
+
+libfreedreno_noop_drm_shim = shared_library(
+  ['freedreno_noop_drm_shim'],
+  'freedreno_noop.c',
+  include_directories: inc_common,
+  dependencies: dep_drm_shim,
+  c_args : c_vis_args,
+  install : true,
+)

src/freedreno/meson.build

@@ -24,6 +24,10 @@ subdir('drm')
 subdir('ir3')
 subdir('registers')
 
+if with_tools.contains('drm-shim')
+  subdir('drm-shim')
+endif
+
 if with_freedreno_vk
   subdir('vulkan')
 endif