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linux: Exposes renderD nodes and chardev in sysfs

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To allow normal users to render through the render device, we expose the
renderD node. This enables Wayland applications to use hardware
acceleration when running under the Linux emulator.

Additionally, libdrm and Mesa need to look up
/sys/dev/char/<major>:<minor> and <pcidev>/drm to identify the
corresponding renderer device (e.g., a renderD device). We expose this
path as well so that libdrm can locate the renderer.

Differential Revision: https://reviews.freebsd.org/D59190
This commit is contained in:
ShengYi Hung committed 2026-09-26 16:36:46 +10:00
1 parent 269002da45
commit 102adf88e6
1 file changed
+56 -2
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sys/compat/linsysfs/linsysfs.c
+56 -2
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@@ -200,6 +200,9 @@ linsysfs_fill_uevent_pci(PFS_FILL_ARGS)
return (0);
}
/* Linux DRM render nodes start at minor 128. */
#define DRM_RENDER_MINOR_BASE 128
/*
* Filler function for drm uevent file
*/
@@ -217,6 +220,19 @@ linsysfs_fill_uevent_drm(PFS_FILL_ARGS)
return (0);
}
static int
linsysfs_fill_uevent_drm_render(PFS_FILL_ARGS)
{
device_t dev;
int unit;
dev = (device_t)pn->pn_data;
unit = device_get_unit(dev);
sbuf_printf(sb, "MAJOR=226\nMINOR=%d\nDEVNAME=dri/renderD%d\n",
unit + DRM_RENDER_MINOR_BASE, unit + DRM_RENDER_MINOR_BASE);
return (0);
}
static char *
get_full_pfs_path(struct pfs_node *cur)
{
@@ -259,7 +275,7 @@ linsysfs_run_bus(device_t dev, struct pfs_node *dir, struct pfs_node *scsi,
struct pfs_node *chardev, struct pfs_node *drm, char *path, char *prefix)
{
struct scsi_host_queue *scsi_host;
struct pfs_node *sub_dir, *cur_file;
struct pfs_node *sub_dir, *cur_file, *drm_dir, *drm_minor;
int i, nchildren, error;
device_t *children, parent;
devclass_t devclass;
@@ -378,7 +394,7 @@ linsysfs_run_bus(device_t dev, struct pfs_node *dir, struct pfs_node *scsi,
device_get_unit(dev) >= 0) {
dinfo = device_get_ivars(parent);
if (dinfo != NULL && dinfo->cfg.baseclass == PCIC_DISPLAY) {
pfs_create_dir(dir, NULL, "drm", NULL, NULL,
pfs_create_dir(dir, &drm_dir, "drm", NULL, NULL,
NULL, 0);
sprintf(devname, "226:%d",
device_get_unit(dev));
@@ -400,6 +416,44 @@ linsysfs_run_bus(device_t dev, struct pfs_node *dir, struct pfs_node *scsi,
&linsysfs_fill_vgapci, NULL, NULL, NULL,
PFS_RD);
cur_file->pn_data = (void*)dir;
pfs_create_dir(drm_dir, &drm_minor, devname,
NULL, NULL, NULL, 0);
pfs_create_file(drm_minor, &cur_file, "uevent",
&linsysfs_fill_uevent_drm, NULL, NULL, NULL,
PFS_RD);
cur_file->pn_data = (void *)dev;
sprintf(devname, "226:%d",
device_get_unit(dev) +
DRM_RENDER_MINOR_BASE);
pfs_create_dir(chardev, &sub_dir, devname, NULL,
NULL, NULL, 0);
pfs_create_link(sub_dir, &cur_file, "device",
&linsysfs_fill_vgapci, NULL, NULL, NULL,
PFS_RD);
cur_file->pn_data = (void *)dir;
pfs_create_file(sub_dir, &cur_file, "uevent",
&linsysfs_fill_uevent_drm_render, NULL,
NULL, NULL, PFS_RD);
cur_file->pn_data = (void *)dev;
sprintf(devname, "renderD%d",
device_get_unit(dev) +
DRM_RENDER_MINOR_BASE);
pfs_create_dir(drm, &sub_dir, devname, NULL,
NULL, NULL, 0);
pfs_create_link(sub_dir, &cur_file, "device",
&linsysfs_fill_vgapci, NULL, NULL, NULL,
PFS_RD);
cur_file->pn_data = (void *)dir;
pfs_create_dir(drm_dir, &drm_minor, devname,
NULL, NULL, NULL, 0);
pfs_create_file(drm_minor, &cur_file, "uevent",
&linsysfs_fill_uevent_drm_render, NULL,
NULL, NULL, PFS_RD);
cur_file->pn_data = (void *)dev;
}
}
}