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/*
* Copyright © 2017 Intel Corporation
*
* 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, sublicense,
* 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 NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS 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.
*
*/
#include <sys/stat.h>
#include <sys/sysmacros.h>
#include "igt.h"
#include "igt_device.h"
#include "igt_sysfs.h"
int __igt_device_set_master(int fd)
{
int err;
err = 0;
if (drmIoctl(fd, DRM_IOCTL_SET_MASTER, NULL))
err = -errno;
errno = 0;
return err;
}
/**
* igt_device_set_master: Set the device fd to be DRM master
* @fd: the device
*
* Tell the kernel to make this device fd become DRM master or skip the test.
*/
void igt_device_set_master(int fd)
{
if (__igt_device_set_master(fd)) {
igt_debugfs_dump(fd, "clients");
igt_require_f(__igt_device_set_master(fd) == 0,
"Can't become DRM master, "
"please check if no other DRM client is running.\n");
}
}
int __igt_device_drop_master(int fd)
{
int err;
err = 0;
if (drmIoctl(fd, DRM_IOCTL_DROP_MASTER, NULL))
err = -errno;
errno = 0;
return err;
}
/**
* igt_device_drop_master: Drop DRM master
* @fd: the device
*
* Tell the kernel we no longer want this device fd to be the DRM master;
* asserting that we lose the privilege. Return if we are master already.
*/
void igt_device_drop_master(int fd)
{
/* Check if we are master before dropping */
if (__igt_device_set_master(fd))
return;
if (__igt_device_drop_master(fd)) {
igt_debugfs_dump(fd, "clients");
igt_assert_f(__igt_device_drop_master(fd) == 0,
"Failed to drop DRM master.\n");
}
}
/**
* igt_device_get_card_index:
* @fd: the device
*
* Returns:
* Index (N) of /dev/dri/cardN or /dev/dri/renderDN corresponding with fd.
*
*/
int igt_device_get_card_index(int fd)
{
struct stat st;
igt_fail_on(fstat(fd, &st) || !S_ISCHR(st.st_mode));
return minor(st.st_rdev);
}
#define IGT_DEV_PATH_LEN 80
static bool igt_device_is_pci(int fd)
{
char path[IGT_DEV_PATH_LEN];
char *subsystem;
int sysfs;
int len;
sysfs = igt_sysfs_open(fd);
if (sysfs == -1)
return false;
len = readlinkat(sysfs, "device/subsystem", path, sizeof(path) - 1);
if (len == -1)
return false;
path[len] = '\0';
subsystem = strrchr(path, '/');
if (!subsystem)
return false;
return strcmp(subsystem, "/pci") == 0;
}
struct igt_pci_addr {
unsigned int domain;
unsigned int bus;
unsigned int device;
unsigned int function;
};
static int igt_device_get_pci_addr(int fd, struct igt_pci_addr *pci)
{
char path[IGT_DEV_PATH_LEN];
char *buf;
int sysfs;
int len;
if (!igt_device_is_pci(fd))
return -ENODEV;
sysfs = igt_sysfs_open(fd);
if (sysfs == -1)
return -ENOENT;
len = readlinkat(sysfs, "device", path, sizeof(path) - 1);
if (len == -1)
return -ENOENT;
path[len] = '\0';
buf = strrchr(path, '/');
if (!buf)
return -ENOENT;
if (sscanf(buf, "/%4x:%2x:%2x.%2x",
&pci->domain, &pci->bus,
&pci->device, &pci->function) != 4) {
igt_warn("Unable to extract PCI device address from '%s'\n", buf);
return -ENOENT;
}
return 0;
}
static struct pci_device *__igt_device_get_pci_device(int fd)
{
struct igt_pci_addr pci_addr;
struct pci_device *pci_dev;
if (igt_device_get_pci_addr(fd, &pci_addr)) {
igt_warn("Unable to find device PCI address\n");
return NULL;
}
if (pci_system_init()) {
igt_warn("Couldn't initialize PCI system\n");
return NULL;
}
pci_dev = pci_device_find_by_slot(pci_addr.domain,
pci_addr.bus,
pci_addr.device,
pci_addr.function);
if (!pci_dev) {
igt_warn("Couldn't find PCI device %04x:%02x:%02x:%02x\n",
pci_addr.domain, pci_addr.bus,
pci_addr.device, pci_addr.function);
return NULL;
}
if (pci_device_probe(pci_dev)) {
igt_warn("Couldn't probe PCI device\n");
return NULL;
}
return pci_dev;
}
/**
* igt_device_get_pci_device:
*
* @fd: the device
*
* Looks up the main graphics pci device using libpciaccess.
*
* Returns:
* The pci_device, skips the test on any failures.
*/
struct pci_device *igt_device_get_pci_device(int fd)
{
struct pci_device *pci_dev;
pci_dev = __igt_device_get_pci_device(fd);
igt_require(pci_dev);
return pci_dev;
}
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