Commit 3988580e authored by Emil Velikov's avatar Emil Velikov Committed by Emil Velikov
Browse files

xf86drm: Add drmDevice support for virtio_gpu

The GPU almost exclusively lives on the PCI bus, so we expose it as a
normal PCI one.

This allows all existing drmDevice users to work without any changes.

One could wonder why a separate typeset is not introduced, alike say
host1x. Unlike host1x the PCI/platform distinction for virtio provides
no extra information. Plus if needed we can add the separate set at a
later stage.

Here are a few 'features' that virtio seems to be missing:
 - provides extra information on top the plaform devices
 - supports a range of GPU devices
 - is considered hardware description (DT)
Signed-off-by: Emil Velikov's avatarEmil Velikov <>
Tested-by: Robert Foss's avatarRobert Foss <>
Reviewed-by: Robert Foss's avatarRobert Foss <>
Reviewed-by: Eric Engestrom's avatarEric Engestrom <>
parent a0290013
......@@ -2954,6 +2954,9 @@ sysfs_uevent_get(const char *path, const char *fmt, ...)
/* Little white lie to avoid major rework of the existing code */
#define DRM_BUS_VIRTIO 0x10
static int drmParseSubsystemType(int maj, int min)
#ifdef __linux__
......@@ -2983,6 +2986,9 @@ static int drmParseSubsystemType(int maj, int min)
if (strncmp(name, "/host1x", 7) == 0)
return DRM_BUS_HOST1X;
if (strncmp(name, "/virtio", 7) == 0)
return -EINVAL;
#elif defined(__OpenBSD__)
return DRM_BUS_PCI;
......@@ -2995,12 +3001,16 @@ static int drmParseSubsystemType(int maj, int min)
static char *
get_real_pci_path(int maj, int min, char *real_path)
char path[PATH_MAX + 1];
char path[PATH_MAX + 1], *term;
snprintf(path, sizeof(path), "/sys/dev/char/%d:%d/device", maj, min);
if (!realpath(path, real_path))
return NULL;
term = strrchr(real_path, '/');
if (term && strncmp(term, "/virtio", 7) == 0)
*term = 0;
return real_path;
......@@ -3724,6 +3734,7 @@ process_device(drmDevicePtr *device, const char *d_name,
switch (subsystem_type) {
return drmProcessPciDevice(device, node, node_type, maj, min,
fetch_deviceinfo, flags);
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