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mesa/src/loader/loader.c
Faith Ekstrand 0dfe7631a7 loader: Report DRI_PRIME errors earlier 
This needs devices[] in order to print an appropriate message but we
free it right after the loop.  Instead, print the error right away and
make the error case after the free just handle jumping to err.

Fixes: ea84b85887 ("loader: add DRI_PRIME_DEBUG env var")
Reviewed-by: Adam Jackson <ajax@redhat.com>
Reviewed-By: Mike Blumenkrantz <michael.blumenkrantz@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/36014>
(cherry picked from commit 9e1a1633c4)
2025-07-16 16:23:12 +02:00

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/*
* Copyright (C) 2013 Rob Clark <robclark@freedesktop.org>
* Copyright (C) 2014-2016 Emil Velikov <emil.l.velikov@gmail.com>
* Copyright (C) 2016 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.
*
* Authors:
* Rob Clark <robclark@freedesktop.org>
*/
#include <dlfcn.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdbool.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <limits.h>
#include <sys/param.h>
#ifdef MAJOR_IN_MKDEV
#include <sys/mkdev.h>
#endif
#ifdef MAJOR_IN_SYSMACROS
#include <sys/sysmacros.h>
#endif
#include <GL/gl.h>
#include "mesa_interface.h"
#include "loader.h"
#include "util/libdrm.h"
#include "util/os_file.h"
#include "util/os_misc.h"
#include "util/u_debug.h"
#include "git_sha1.h"
#include "drm-uapi/nouveau_drm.h"
#define MAX_DRM_DEVICES 64
#ifdef USE_DRICONF
#include "util/xmlconfig.h"
#include "util/driconf.h"
#endif
#include "util/macros.h"
#define __IS_LOADER
#include "pci_id_driver_map.h"
/* For systems like Hurd */
#ifndef PATH_MAX
#define PATH_MAX 4096
#endif
static void default_logger(int level, const char *fmt, ...)
{
if (level <= _LOADER_WARNING) {
va_list args;
va_start(args, fmt);
vfprintf(stderr, fmt, args);
va_end(args);
}
}
static loader_logger *log_ = default_logger;
int
loader_open_device(const char *device_name)
{
int fd;
#ifdef O_CLOEXEC
fd = open(device_name, O_RDWR | O_CLOEXEC);
if (fd == -1 && errno == EINVAL)
#endif
{
fd = open(device_name, O_RDWR);
if (fd != -1)
fcntl(fd, F_SETFD, fcntl(fd, F_GETFD) | FD_CLOEXEC);
}
if (fd == -1 && errno == EACCES) {
log_(_LOADER_WARNING, "failed to open %s: %s\n",
device_name, strerror(errno));
}
return fd;
}
char *
loader_get_kernel_driver_name(int fd)
{
char *driver;
drmVersionPtr version = drmGetVersion(fd);
if (!version) {
log_(_LOADER_WARNING, "failed to get driver name for fd %d\n", fd);
return NULL;
}
driver = strndup(version->name, version->name_len);
log_(driver ? _LOADER_DEBUG : _LOADER_WARNING, "using driver %s for %d\n",
driver, fd);
drmFreeVersion(version);
return driver;
}
bool
iris_predicate(int fd, const char *driver)
{
char *kernel_driver = loader_get_kernel_driver_name(fd);
bool ret = kernel_driver && (strcmp(kernel_driver, "i915") == 0 ||
strcmp(kernel_driver, "xe") == 0);
free(kernel_driver);
return ret;
}
/* choose zink or nouveau GL */
bool
nouveau_zink_predicate(int fd, const char *driver)
{
#if !defined(HAVE_NVK) || !defined(HAVE_ZINK)
if (!strcmp(driver, "zink"))
return false;
return true;
#else
bool prefer_zink = false;
/* Enable Zink by default on Turing and later GPUs
*
* We only use Zink if if the kernel supports VMA_TILEMODE, which is needed
* for DRM format modifiers. This also doubles as a check for a new enough
* kernel to run NVK in general.
*/
struct drm_nouveau_getparam r = { .param = NOUVEAU_GETPARAM_HAS_VMA_TILEMODE };
int ret = drmCommandWriteRead(fd, DRM_NOUVEAU_GETPARAM, &r, sizeof(r));
if (ret == 0 && r.value == 1) {
r.param = NOUVEAU_GETPARAM_CHIPSET_ID;
r.value = 0;
ret = drmCommandWriteRead(fd, DRM_NOUVEAU_GETPARAM, &r, sizeof(r));
if (ret == 0 && r.value >= 0x160) {
prefer_zink = true;
}
}
prefer_zink = debug_get_bool_option("NOUVEAU_USE_ZINK", prefer_zink);
if (prefer_zink && !strcmp(driver, "zink"))
return true;
if (!prefer_zink && !strcmp(driver, "nouveau"))
return true;
return false;
#endif
}
/**
* Goes through all the platform devices whose driver is on the given list and
* try to open their render node. It returns the fd of the first device that
* it can open.
*/
int
loader_open_render_node_platform_device(const char * const drivers[],
unsigned int n_drivers)
{
unsigned int n_devices;
int *fds = loader_open_render_node_platform_devices(drivers, n_drivers, &n_devices);
int fd = -1;
if (n_devices > 0) {
fd = fds[0];
free(fds);
}
return fd;
}
/**
* Goes through all the platform devices whose driver is on the given list and
* try to open their render node. It returns an array with the fds of all the
* devices that it can open.
*
* Caller must close the returned fds and free the array.
*/
int *
loader_open_render_node_platform_devices(const char * const drivers[],
unsigned int n_drivers,
unsigned int *n_devices)
{
drmDevicePtr devices[MAX_DRM_DEVICES], device;
int num_devices, fd = -1;
int i, j;
bool found = false;
int *result;
num_devices = drmGetDevices2(0, devices, MAX_DRM_DEVICES);
if (num_devices <= 0) {
*n_devices = 0;
return NULL;
}
result = calloc(n_drivers, num_devices);
*n_devices = 0;
for (i = 0; i < num_devices; i++) {
device = devices[i];
if ((device->available_nodes & (1 << DRM_NODE_RENDER)) &&
(device->bustype == DRM_BUS_PLATFORM)) {
drmVersionPtr version;
fd = loader_open_device(device->nodes[DRM_NODE_RENDER]);
if (fd < 0)
continue;
version = drmGetVersion(fd);
if (!version) {
close(fd);
continue;
}
for (j = 0; j < n_drivers; j++) {
if (strcmp(version->name, drivers[j]) == 0) {
found = true;
break;
}
}
drmFreeVersion(version);
if (found)
result[(*n_devices)++] = fd;
else
close(fd);
}
}
drmFreeDevices(devices, num_devices);
if (*n_devices == 0) {
free(result);
return NULL;
}
return result;
}
bool
loader_is_device_render_capable(int fd)
{
drmDevicePtr dev_ptr;
bool ret;
if (drmGetDevice2(fd, 0, &dev_ptr) != 0)
return false;
ret = (dev_ptr->available_nodes & (1 << DRM_NODE_RENDER));
drmFreeDevice(&dev_ptr);
return ret;
}
char *
loader_get_render_node(dev_t device)
{
char *render_node = NULL;
drmDevicePtr dev_ptr;
if (drmGetDeviceFromDevId(device, 0, &dev_ptr) < 0)
return NULL;
if (dev_ptr->available_nodes & (1 << DRM_NODE_RENDER)) {
render_node = strdup(dev_ptr->nodes[DRM_NODE_RENDER]);
if (!render_node)
log_(_LOADER_DEBUG, "MESA-LOADER: failed to allocate memory for render node\n");
}
drmFreeDevice(&dev_ptr);
return render_node;
}
#ifdef USE_DRICONF
static const driOptionDescription __driConfigOptionsLoader[] = {
DRI_CONF_SECTION_INITIALIZATION
DRI_CONF_DEVICE_ID_PATH_TAG()
DRI_CONF_DRI_DRIVER()
DRI_CONF_SECTION_END
};
static char *loader_get_dri_config_driver(int fd)
{
driOptionCache defaultInitOptions;
driOptionCache userInitOptions;
char *dri_driver = NULL;
char *kernel_driver = loader_get_kernel_driver_name(fd);
driParseOptionInfo(&defaultInitOptions, __driConfigOptionsLoader,
ARRAY_SIZE(__driConfigOptionsLoader));
driParseConfigFiles(&userInitOptions, &defaultInitOptions, 0,
"loader", kernel_driver, NULL, NULL, 0, NULL, 0);
if (driCheckOption(&userInitOptions, "dri_driver", DRI_STRING)) {
char *opt = driQueryOptionstr(&userInitOptions, "dri_driver");
/* not an empty string */
if (*opt)
dri_driver = strdup(opt);
}
driDestroyOptionCache(&userInitOptions);
driDestroyOptionInfo(&defaultInitOptions);
free(kernel_driver);
return dri_driver;
}
static char *loader_get_dri_config_device_id(void)
{
driOptionCache defaultInitOptions;
driOptionCache userInitOptions;
char *prime = NULL;
driParseOptionInfo(&defaultInitOptions, __driConfigOptionsLoader,
ARRAY_SIZE(__driConfigOptionsLoader));
driParseConfigFiles(&userInitOptions, &defaultInitOptions, 0,
"loader", NULL, NULL, NULL, 0, NULL, 0);
if (driCheckOption(&userInitOptions, "device_id", DRI_STRING)) {
char *opt = driQueryOptionstr(&userInitOptions, "device_id");
if (*opt)
prime = strdup(opt);
}
driDestroyOptionCache(&userInitOptions);
driDestroyOptionInfo(&defaultInitOptions);
return prime;
}
#endif
static char *drm_construct_id_path_tag(drmDevicePtr device)
{
char *tag = NULL;
if (device->bustype == DRM_BUS_PCI) {
if (asprintf(&tag, "pci-%04x_%02x_%02x_%1u",
device->businfo.pci->domain,
device->businfo.pci->bus,
device->businfo.pci->dev,
device->businfo.pci->func) < 0) {
return NULL;
}
} else if (device->bustype == DRM_BUS_PLATFORM ||
device->bustype == DRM_BUS_HOST1X) {
char *fullname, *name, *address;
if (device->bustype == DRM_BUS_PLATFORM)
fullname = device->businfo.platform->fullname;
else
fullname = device->businfo.host1x->fullname;
name = strrchr(fullname, '/');
if (!name)
name = strdup(fullname);
else
name = strdup(name + 1);
address = strchr(name, '@');
if (address) {
*address++ = '\0';
if (asprintf(&tag, "platform-%s_%s", address, name) < 0)
tag = NULL;
} else {
if (asprintf(&tag, "platform-%s", name) < 0)
tag = NULL;
}
free(name);
}
return tag;
}
static bool drm_device_matches_tag(drmDevicePtr device, const char *prime_tag)
{
char *tag = drm_construct_id_path_tag(device);
int ret;
if (tag == NULL)
return false;
ret = strcmp(tag, prime_tag);
free(tag);
return ret == 0;
}
static char *drm_get_id_path_tag_for_fd(int fd)
{
drmDevicePtr device;
char *tag;
if (drmGetDevice2(fd, 0, &device) != 0)
return NULL;
tag = drm_construct_id_path_tag(device);
drmFreeDevice(&device);
return tag;
}
bool loader_get_user_preferred_fd(int *fd_render_gpu, int *original_fd)
{
const char *dri_prime = getenv("DRI_PRIME");
bool debug = debug_get_bool_option("DRI_PRIME_DEBUG", false);
char *default_tag = NULL;
drmDevicePtr devices[MAX_DRM_DEVICES];
int i, num_devices, fd = -1;
struct {
enum {
PRIME_IS_INTEGER,
PRIME_IS_VID_DID,
PRIME_IS_PCI_TAG
} semantics;
union {
int as_integer;
struct {
uint16_t v, d;
} as_vendor_device_ids;
} v;
char *str;
} prime = {};
prime.str = NULL;
if (dri_prime)
prime.str = strdup(dri_prime);
#ifdef USE_DRICONF
else
prime.str = loader_get_dri_config_device_id();
#endif
if (prime.str == NULL) {
goto no_prime_gpu_offloading;
} else {
uint16_t vendor_id, device_id;
if (sscanf(prime.str, "%hx:%hx", &vendor_id, &device_id) == 2) {
prime.semantics = PRIME_IS_VID_DID;
prime.v.as_vendor_device_ids.v = vendor_id;
prime.v.as_vendor_device_ids.d = device_id;
} else {
int i = atoi(prime.str);
if (i < 0 || strcmp(prime.str, "0") == 0) {
printf("Invalid value (%d) for DRI_PRIME. Should be > 0\n", i);
goto err;
} else if (i == 0) {
prime.semantics = PRIME_IS_PCI_TAG;
} else {
prime.semantics = PRIME_IS_INTEGER;
prime.v.as_integer = i;
}
}
}
default_tag = drm_get_id_path_tag_for_fd(*fd_render_gpu);
if (default_tag == NULL)
goto err;
num_devices = drmGetDevices2(0, devices, MAX_DRM_DEVICES);
if (num_devices <= 0)
goto err;
if (debug) {
log_(_LOADER_WARNING, "DRI_PRIME: %d devices\n", num_devices);
for (i = 0; i < num_devices; i++) {
log_(_LOADER_WARNING, " %d:", i);
if (!(devices[i]->available_nodes & 1 << DRM_NODE_RENDER)) {
log_(_LOADER_WARNING, "not a render node -> not usable\n");
continue;
}
char *tag = drm_construct_id_path_tag(devices[i]);
if (tag) {
log_(_LOADER_WARNING, " %s", tag);
free(tag);
}
if (devices[i]->bustype == DRM_BUS_PCI) {
log_(_LOADER_WARNING, " %4x:%4x",
devices[i]->deviceinfo.pci->vendor_id,
devices[i]->deviceinfo.pci->device_id);
}
log_(_LOADER_WARNING, " %s", devices[i]->nodes[DRM_NODE_RENDER]);
if (drm_device_matches_tag(devices[i], default_tag)) {
log_(_LOADER_WARNING, " [default]");
}
log_(_LOADER_WARNING, "\n");
}
}
if (prime.semantics == PRIME_IS_INTEGER &&
prime.v.as_integer >= num_devices) {
printf("Inconsistent value (%d) for DRI_PRIME. Should be < %d "
"(GPU devices count). Using: %d\n",
prime.v.as_integer, num_devices, num_devices - 1);
prime.v.as_integer = num_devices - 1;
}
for (i = 0; i < num_devices; i++) {
if (!(devices[i]->available_nodes & 1 << DRM_NODE_RENDER))
continue;
log_(debug ? _LOADER_WARNING : _LOADER_INFO, "DRI_PRIME: device %d ", i);
/* three formats of DRI_PRIME are supported:
* "N": a >= 1 integer value. Select the Nth GPU, skipping the
* default one.
* id_path_tag: (for example "pci-0000_02_00_0") choose the card
* with this id_path_tag.
* vendor_id:device_id
*/
switch (prime.semantics) {
case PRIME_IS_INTEGER: {
/* Skip the default device */
if (drm_device_matches_tag(devices[i], default_tag)) {
log_(debug ? _LOADER_WARNING : _LOADER_INFO,
"skipped (default device)\n");
continue;
}
prime.v.as_integer--;
/* Skip more GPUs? */
if (prime.v.as_integer) {
log_(debug ? _LOADER_WARNING : _LOADER_INFO,
"skipped (%d more to skip)\n", prime.v.as_integer - 1);
continue;
}
log_(debug ? _LOADER_WARNING : _LOADER_INFO, " -> ");
break;
}
case PRIME_IS_VID_DID: {
if (devices[i]->bustype == DRM_BUS_PCI &&
devices[i]->deviceinfo.pci->vendor_id == prime.v.as_vendor_device_ids.v &&
devices[i]->deviceinfo.pci->device_id == prime.v.as_vendor_device_ids.d) {
/* Update prime for the "different_device"
* determination below. */
free(prime.str);
prime.str = drm_construct_id_path_tag(devices[i]);
log_(debug ? _LOADER_WARNING : _LOADER_INFO,
" - vid:did match -> ");
break;
} else {
log_(debug ? _LOADER_WARNING : _LOADER_INFO,
"skipped (vid:did didn't match)\n");
}
continue;
}
case PRIME_IS_PCI_TAG: {
if (!drm_device_matches_tag(devices[i], prime.str)) {
log_(debug ? _LOADER_WARNING : _LOADER_INFO,
"skipped (pci id tag didn't match)\n");
continue;
}
log_(debug ? _LOADER_WARNING : _LOADER_INFO, " - pci tag match -> ");
break;
}
}
log_(debug ? _LOADER_WARNING : _LOADER_INFO,
"selected (%s)\n", devices[i]->nodes[DRM_NODE_RENDER]);
fd = loader_open_device(devices[i]->nodes[DRM_NODE_RENDER]);
if (fd < 0) {
log_(debug ? _LOADER_WARNING : _LOADER_INFO,
"DRI_PRIME: failed to open '%s'\n",
devices[i]->nodes[DRM_NODE_RENDER]);
}
break;
}
drmFreeDevices(devices, num_devices);
if (i == num_devices || fd < 0)
goto err;
bool is_render_and_display_gpu_diff = !!strcmp(default_tag, prime.str);
if (original_fd) {
if (is_render_and_display_gpu_diff) {
*original_fd = *fd_render_gpu;
*fd_render_gpu = fd;
} else {
*original_fd = *fd_render_gpu;
close(fd);
}
} else {
close(*fd_render_gpu);
*fd_render_gpu = fd;
}
free(default_tag);
free(prime.str);
return is_render_and_display_gpu_diff;
err:
log_(debug ? _LOADER_WARNING : _LOADER_INFO,
"DRI_PRIME: error. Using the default GPU\n");
free(default_tag);
free(prime.str);
no_prime_gpu_offloading:
if (original_fd)
*original_fd = *fd_render_gpu;
return false;
}
static bool
drm_get_pci_id_for_fd(int fd, int *vendor_id, int *chip_id)
{
drmDevicePtr device;
if (drmGetDevice2(fd, 0, &device) != 0) {
log_(_LOADER_WARNING, "MESA-LOADER: failed to retrieve device information\n");
return false;
}
if (device->bustype != DRM_BUS_PCI) {
drmFreeDevice(&device);
log_(_LOADER_DEBUG, "MESA-LOADER: device is not located on the PCI bus\n");
return false;
}
*vendor_id = device->deviceinfo.pci->vendor_id;
*chip_id = device->deviceinfo.pci->device_id;
drmFreeDevice(&device);
return true;
}
#ifdef __linux__
static int loader_get_linux_pci_field(int maj, int min, const char *field)
{
char path[PATH_MAX + 1];
snprintf(path, sizeof(path), "/sys/dev/char/%d:%d/device/%s", maj, min, field);
char *field_str = os_read_file(path, NULL);
if (!field_str) {
/* Probably non-PCI device. */
return 0;
}
int value = (int)strtoll(field_str, NULL, 16);
free(field_str);
return value;
}
static bool
loader_get_linux_pci_id_for_fd(int fd, int *vendor_id, int *chip_id)
{
struct stat sbuf;
if (fstat(fd, &sbuf) != 0) {
log_(_LOADER_DEBUG, "MESA-LOADER: failed to fstat fd\n");
return false;
}
int maj = major(sbuf.st_rdev);
int min = minor(sbuf.st_rdev);
*vendor_id = loader_get_linux_pci_field(maj, min, "vendor");
*chip_id = loader_get_linux_pci_field(maj, min, "device");
return *vendor_id && *chip_id;
}
#endif /* __linux__ */
bool
loader_get_pci_id_for_fd(int fd, int *vendor_id, int *chip_id)
{
#ifdef __linux__
/* Implementation without causing full enumeration of DRM devices. */
if (loader_get_linux_pci_id_for_fd(fd, vendor_id, chip_id))
return true;
#endif
return drm_get_pci_id_for_fd(fd, vendor_id, chip_id);
}
char *
loader_get_device_name_for_fd(int fd)
{
return drmGetDeviceNameFromFd2(fd);
}
static char *
loader_get_pci_driver(int fd)
{
int vendor_id, chip_id, i, j;
char *driver = NULL;
if (!loader_get_pci_id_for_fd(fd, &vendor_id, &chip_id))
return NULL;
for (i = 0; i < ARRAY_SIZE(driver_map); i++) {
if (vendor_id != driver_map[i].vendor_id)
continue;
if (driver_map[i].predicate && !driver_map[i].predicate(fd, driver_map[i].driver))
continue;
if (driver_map[i].num_chips_ids == -1) {
driver = strdup(driver_map[i].driver);
goto out;
}
for (j = 0; j < driver_map[i].num_chips_ids; j++)
if (driver_map[i].chip_ids[j] == chip_id) {
driver = strdup(driver_map[i].driver);
goto out;
}
}
out:
log_(driver ? _LOADER_DEBUG : _LOADER_WARNING,
"pci id for fd %d: %04x:%04x, driver %s\n",
fd, vendor_id, chip_id, driver);
return driver;
}
char *
loader_get_driver_for_fd(int fd)
{
char *driver;
/* Allow an environment variable to force choosing a different driver
* binary. If that driver binary can't survive on this FD, that's the
* user's problem, but this allows vc4 simulator to run on an i965 host,
* and may be useful for some touch testing of i915 on an i965 host.
*/
if (__normal_user()) {
const char *override = os_get_option("MESA_LOADER_DRIVER_OVERRIDE");
if (override)
return strdup(override);
}
#if defined(USE_DRICONF)
driver = loader_get_dri_config_driver(fd);
if (driver)
return driver;
#endif
driver = loader_get_pci_driver(fd);
if (!driver)
driver = loader_get_kernel_driver_name(fd);
return driver;
}
void
loader_set_logger(loader_logger *logger)
{
log_ = logger;
}
bool
loader_bind_extensions(void *data,
const struct dri_extension_match *matches, size_t num_matches,
const __DRIextension **extensions)
{
bool ret = true;
for (size_t j = 0; j < num_matches; j++) {
const struct dri_extension_match *match = &matches[j];
const __DRIextension **field = (const __DRIextension **)((char *)data + matches[j].offset);
for (size_t i = 0; extensions[i]; i++) {
if (strcmp(extensions[i]->name, match->name) == 0 &&
extensions[i]->version >= match->version) {
*field = extensions[i];
break;
}
}
if (!*field) {
log_(match->optional ? _LOADER_DEBUG : _LOADER_FATAL, "did not find extension %s version %d\n",
match->name, match->version);
if (!match->optional)
ret = false;
continue;
}
/* The loaders rely on the loaded DRI drivers being from the same Mesa
* build so that we can reference the same structs on both sides.
*/
if (strcmp(match->name, __DRI_MESA) == 0) {
const __DRImesaCoreExtension *mesa = (const __DRImesaCoreExtension *)*field;
if (strcmp(mesa->version_string, MESA_INTERFACE_VERSION_STRING) != 0) {
log_(_LOADER_FATAL, "libgallium not from this Mesa build (libgallium: '%s', loader: '%s')\n",
mesa->version_string, MESA_INTERFACE_VERSION_STRING);
ret = false;
}
}
}
return ret;
}
/**
* Opens a driver or backend using its name, returning the library handle.
*
* \param driverName - a name like "i965", "radeon", "nouveau", etc.
* \param lib_suffix - a suffix to append to the driver name to generate the
* full library name.
* \param search_path_vars - NULL-terminated list of env vars that can be used
* \param default_search_path - a colon-separted list of directories used if
* search_path_vars is NULL or none of the vars are set in the environment.
* \param warn_on_fail - Log a warning if the driver is not found.
*/
void *
loader_open_driver_lib(const char *driver_name,
const char *lib_suffix,
const char **search_path_vars,
const char *default_search_path,
bool warn_on_fail)
{
char path[PATH_MAX];
const char *search_paths, *next, *end;
search_paths = NULL;
if (__normal_user() && search_path_vars) {
for (int i = 0; search_path_vars[i] != NULL; i++) {
search_paths = os_get_option(search_path_vars[i]);
if (search_paths)
break;
}
}
if (search_paths == NULL)
search_paths = default_search_path;
void *driver = NULL;
const char *dl_error = NULL;
end = search_paths + strlen(search_paths);
for (const char *p = search_paths; p < end; p = next + 1) {
int len;
next = strchr(p, ':');
if (next == NULL)
next = end;
len = next - p;
snprintf(path, sizeof(path), "%.*s/%s%s.so", len,
p, driver_name, lib_suffix);
driver = dlopen(path, RTLD_NOW | RTLD_GLOBAL);
if (driver == NULL) {
dl_error = dlerror();
log_(_LOADER_DEBUG, "MESA-LOADER: failed to open %s: %s\n",
path, dl_error);
}
/* not need continue to loop all paths once the driver is found */
if (driver != NULL)
break;
}
if (driver == NULL) {
if (warn_on_fail) {
log_(_LOADER_WARNING,
"MESA-LOADER: failed to open %s: %s (search paths %s, suffix %s)\n",
driver_name, dl_error, search_paths, lib_suffix);
}
return NULL;
}
log_(_LOADER_DEBUG, "MESA-LOADER: dlopen(%s)\n", path);
return driver;
}
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