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drm-shim: Add hide_drm_device_path()

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Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Eric Engestrom <eric@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/19241>
This commit is contained in:
Jordan Justen
2022-10-21 13:47:11 -07:00
parent d7ed05d1ba
commit b39044fd9f
1 changed files with 38 additions and 3 deletions
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41
src/drm-shim/drm_shim.c
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@@ -92,11 +92,16 @@ REAL_FUNCTION_POINTER(fstat);
REAL_FUNCTION_POINTER(fstat64);
#endif
static char render_node_dir[] = "/dev/dri/";
/* Full path of /dev/dri/renderD* */
static char *render_node_path;
/* renderD* */
static char *render_node_dirent_name;
/* /sys/dev/char/major: */
static int drm_device_path_len;
static char *drm_device_path;
/* /sys/dev/char/major:minor/device */
static int device_path_len;
static char *device_path;
/* /sys/dev/char/major:minor/device/subsystem */
static char *subsystem_path;
@@ -245,9 +250,13 @@ init_shim(void)
render_node_path);
}
nfasprintf(&device_path,
"/sys/dev/char/%d:%d/device",
DRM_MAJOR, render_node_minor);
drm_device_path_len =
nfasprintf(&drm_device_path, "/sys/dev/char/%d:", DRM_MAJOR);
device_path_len =
nfasprintf(&device_path,
"/sys/dev/char/%d:%d/device",
DRM_MAJOR, render_node_minor);
nfasprintf(&subsystem_path,
"/sys/dev/char/%d:%d/device/subsystem",
@@ -258,6 +267,32 @@ init_shim(void)
atexit(destroy_shim);
}
static bool hide_drm_device_path(const char *path)
{
if (render_node_minor == -1)
return false;
/* If the path looks like our fake render node device, then don't hide it.
*/
if (strncmp(path, device_path, device_path_len) == 0 ||
strcmp(path, render_node_path) == 0)
return false;
/* String starts with /sys/dev/char/226: but is not the fake render node.
* We want to hide all other drm devices for the shim.
*/
if (strncmp(path, drm_device_path, drm_device_path_len) == 0)
return true;
/* String starts with /dev/dri/ but is not the fake render node. We want to
* hide all other drm devices for the shim.
*/
if (strncmp(path, render_node_dir, sizeof(render_node_dir) - 1) == 0)
return true;
return false;
}
/* Override libdrm's reading of various sysfs files for device enumeration. */
PUBLIC FILE *fopen(const char *path, const char *mode)
{