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/**************************************************************************
*
* Copyright © 2009 VMware, Inc., Palo Alto, CA., USA
* All Rights Reserved.
*
* 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, sub license, 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 NON-INFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS 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.
*
**************************************************************************/
/*
* Thanks to krh and jcristau for the tips on
* going from fd to pci id via fstat and udev.
*/
#include "config.h"
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <xf86drm.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
#include "internal.h"
#define PATH_SIZE 512
static int
linux_name_from_sysfs(int fd, char **out)
{
char path[PATH_SIZE+1] = ""; /* initialize to please valgrind */
char link[PATH_SIZE+1] = "";
struct stat buffer;
unsigned maj, min;
char* slash_name;
int ret;
/*
* Inside the sysfs directory for the device there is a symlink
* to the directory representing the driver module, that path
* happens to hold the name of the driver.
*
* So lets get the symlink for the drm device. Then read the link
* and filter out the last directory which happens to be the name
* of the driver, which we can use to load the correct interface.
*
* Thanks to Ray Strode of Plymouth for the code.
*/
ret = fstat(fd, &buffer);
if (ret)
return ret;
if (!S_ISCHR(buffer.st_mode))
return -EINVAL;
maj = major(buffer.st_rdev);
min = minor(buffer.st_rdev);
snprintf(path, PATH_SIZE, "/sys/dev/char/%d:%d/device/driver", maj, min);
if (readlink(path, link, PATH_SIZE) < 0)
return -EINVAL;
/* link looks something like this: ../../../bus/pci/drivers/intel */
slash_name = strrchr(link, '/');
if (!slash_name)
return -EINVAL;
/* copy name and at the same time remove the slash */
*out = strdup(slash_name + 1);
return 0;
}
static int
linux_from_sysfs(int fd, struct kms_driver **out)
{
char *name;
int ret;
ret = linux_name_from_sysfs(fd, &name);
if (ret)
return ret;
if (!strcmp(name, "intel"))
ret = intel_create(fd, out);
#ifdef HAVE_VMWGFX
else if (!strcmp(name, "vmwgfx"))
ret = vmwgfx_create(fd, out);
#endif
#ifdef HAVE_NOUVEAU
else if (!strcmp(name, "nouveau"))
ret = nouveau_create(fd, out);
#endif
#ifdef HAVE_RADEON
else if (!strcmp(name, "radeon"))
ret = radeon_create(fd, out);
#endif
else
ret = -ENOSYS;
free(name);
return ret;
}
#if 0
#define LIBUDEV_I_KNOW_THE_API_IS_SUBJECT_TO_CHANGE
#include <libudev.h>
struct create_record
{
unsigned vendor;
unsigned chip;
int (*func)(int fd, struct kms_driver **out);
};
static struct create_record table[] = {
{ 0x8086, 0x2a42, intel_create }, /* i965 */
#ifdef HAVE_VMWGFX
{ 0x15ad, 0x0405, vmwgfx_create }, /* VMware vGPU */
#endif
{ 0, 0, NULL },
};
static int
linux_get_pciid_from_fd(int fd, unsigned *vendor_id, unsigned *chip_id)
{
struct udev *udev;
struct udev_device *device;
struct udev_device *parent;
const char *pci_id;
struct stat buffer;
int ret;
ret = fstat(fd, &buffer);
if (ret)
return -EINVAL;
if (!S_ISCHR(buffer.st_mode))
return -EINVAL;
udev = udev_new();
if (!udev)
return -ENOMEM;
device = udev_device_new_from_devnum(udev, 'c', buffer.st_rdev);
if (!device)
goto err_free_udev;
parent = udev_device_get_parent(device);
if (!parent)
goto err_free_device;
pci_id = udev_device_get_property_value(parent, "PCI_ID");
if (!pci_id)
goto err_free_device;
if (sscanf(pci_id, "%x:%x", vendor_id, chip_id) != 2)
goto err_free_device;
udev_device_unref(device);
udev_unref(udev);
return 0;
err_free_device:
udev_device_unref(device);
err_free_udev:
udev_unref(udev);
return -EINVAL;
}
static int
linux_from_udev(int fd, struct kms_driver **out)
{
unsigned vendor_id, chip_id;
int ret, i;
ret = linux_get_pciid_from_fd(fd, &vendor_id, &chip_id);
if (ret)
return ret;
for (i = 0; table[i].func; i++)
if (table[i].vendor == vendor_id && table[i].chip == chip_id)
return table[i].func(fd, out);
return -ENOSYS;
}
#else
static int
linux_from_udev(int fd, struct kms_driver **out)
{
return -ENOSYS;
}
#endif
int
linux_create(int fd, struct kms_driver **out)
{
if (!linux_from_udev(fd, out))
return 0;
return linux_from_sysfs(fd, out);
}
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