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IABSD.fr/xenocara/lib/libdrm/libkms/linux.c
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- lib/libdrm/libkms/linux.c
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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. */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #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 -EINVAL; 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 (!dumb_create(fd, out)) return 0; if (!linux_from_udev(fd, out)) return 0; return linux_from_sysfs(fd, out); }