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mesa/src/loader/loader.c

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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 <GL/internal/dri_interface.h>
#include <GL/internal/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 this once zink is up to speed.
* struct drm_nouveau_getparam r = { .param = NOUVEAU_GETPARAM_CHIPSET_ID };
* int ret = drmCommandWriteRead(fd, DRM_NOUVEAU_GETPARAM, &r, sizeof(r));
* if (ret == 0 && (r.value & ~0xf) >= 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)
{
drmDevicePtr devices[MAX_DRM_DEVICES], device;
int num_devices, fd = -1;
int i, j;
bool found = false;
num_devices = drmGetDevices2(0, devices, MAX_DRM_DEVICES);
if (num_devices <= 0)
return -ENOENT;
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;
}
}
if (!found) {
drmFreeVersion(version);
close(fd);
continue;
}
drmFreeVersion(version);
break;
}
}
drmFreeDevices(devices, num_devices);
if (i == num_devices)
return -ENOENT;
return fd;
}
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]);
break;
}
drmFreeDevices(devices, num_devices);
if (i == num_devices)
goto err;
if (fd < 0) {
log_(debug ? _LOADER_WARNING : _LOADER_INFO,
"DRI_PRIME: failed to open '%s'\n",
devices[i]->nodes[DRM_NODE_RENDER]);
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;
}
char *
loader_get_extensions_name(const char *driver_name)
{
char *name = NULL;
if (asprintf(&name, "%s_%s", __DRI_DRIVER_GET_EXTENSIONS, driver_name) < 0)
return NULL;
const size_t len = strlen(name);
for (size_t i = 0; i < len; i++) {
if (name[i] == '-')
name[i] = '_';
}
return name;
}
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, "DRI driver not from this Mesa build ('%s' vs '%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 = getenv(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/tls/%s%s.so", len,
p, driver_name, lib_suffix);
driver = dlopen(path, RTLD_NOW | RTLD_GLOBAL);
if (driver == NULL) {
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;
}
/**
* Opens a DRI driver using its driver name, returning the __DRIextension
* entrypoints.
*
* \param driverName - a name like "i965", "radeon", "nouveau", etc.
* \param out_driver - Address where the dlopen() return value will be stored.
* \param search_path_vars - NULL-terminated list of env vars that can be used
* to override the DEFAULT_DRIVER_DIR search path.
*/
const struct __DRIextensionRec **
loader_open_driver(const char *driver_name,
void **out_driver_handle,
const char **search_path_vars)
{
char *get_extensions_name;
const struct __DRIextensionRec **extensions = NULL;
const struct __DRIextensionRec **(*get_extensions)(void);
void *driver = loader_open_driver_lib(driver_name, "_dri", search_path_vars,
DEFAULT_DRIVER_DIR, true);
if (!driver)
goto failed;
get_extensions_name = loader_get_extensions_name(driver_name);
if (get_extensions_name) {
get_extensions = dlsym(driver, get_extensions_name);
if (get_extensions) {
extensions = get_extensions();
} else {
log_(_LOADER_DEBUG, "MESA-LOADER: driver does not expose %s(): %s\n",
get_extensions_name, dlerror());
}
free(get_extensions_name);
}
if (extensions == NULL) {
log_(_LOADER_WARNING,
"MESA-LOADER: driver exports no extensions (%s)\n", dlerror());
dlclose(driver);
driver = NULL;
}
failed:
*out_driver_handle = driver;
return extensions;
}
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