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fuchsia / third_party / github.com / intel / media-driver / dbc8dc707e8f944c22e26afaea0289e169ca9b8a / . / cmrtlib / linux / hardware / drm_device.h
blob: 8071de9faeff1b7f0693d8eeb6eb29bd5f6007b2 [file] [log] [blame]
/*
* Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
* Copyright(c) 2019, 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
* PRECISION INSIGHT 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.
*/
#ifndef DRM_DEVICE_H_
#define DRM_DEVICE_H_
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <unistd.h>
#include <string.h>
#include <strings.h>
#include <ctype.h>
#include <dirent.h>
#include <stddef.h>
#include <fcntl.h>
#include <errno.h>
#include <limits.h>
#include <signal.h>
#include <time.h>
#include <sys/sysmacros.h> //<sys/types.h>
#include <sys/stat.h>
#define stat_t struct stat
#include <sys/ioctl.h>
#include <sys/time.h>
#include <stdarg.h>
#ifdef MAJOR_IN_MKDEV
#include <sys/mkdev.h>
#endif
#ifdef MAJOR_IN_SYSMACROS
#include <sys/sysmacros.h>
#endif
#include <math.h>
#include <string>
#define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
/* Not all systems have MAP_FAILED defined */
#ifndef MAP_FAILED
#define MAP_FAILED ((void *)-1)
#endif
#define DRM_DEV_UID 0
#define DRM_DEV_GID 0
/* Default /dev/dri directory permissions 0755 */
#define DRM_DEV_DIRMODE (S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH)
#define DRM_DEV_MODE (S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP)
#define DRM_DEVICE_GET_PCI_REVISION (1 << 0)
#ifdef __OpenBSD__
#define DRM_DIR_NAME "/dev"
#define DRM_DEV_NAME "%s/drm%d"
#define DRM_CONTROL_DEV_NAME "%s/drmC%d"
#define DRM_RENDER_DEV_NAME "%s/drmR%d"
#else
#define DRM_DIR_NAME "/dev/dri"
#define DRM_DEV_NAME "%s/card%d"
#define DRM_CONTROL_DEV_NAME "%s/controlD%d"
#define DRM_RENDER_DEV_NAME "%s/renderD%d"
#define DRM_PROC_NAME "/proc/dri/" /* For backward Linux compatibility */
#endif
#ifdef __OpenBSD__
#define DRM_PRIMARY_MINOR_NAME "drm"
#define DRM_CONTROL_MINOR_NAME "drmC"
#define DRM_RENDER_MINOR_NAME "drmR"
#else
#define DRM_PRIMARY_MINOR_NAME "card"
#define DRM_CONTROL_MINOR_NAME "controlD"
#define DRM_RENDER_MINOR_NAME "renderD"
#endif
#define DRM_ERR_NO_DEVICE (-1001)
#define DRM_ERR_NO_ACCESS (-1002)
#define DRM_ERR_NOT_ROOT (-1003)
#define DRM_ERR_INVALID (-1004)
#define DRM_ERR_NO_FD (-1005)
#define DRM_AGP_NO_HANDLE 0
#define DRM_BUS_PCI 0
#define DRM_BUS_USB 1
#define DRM_BUS_PLATFORM 2
#define DRM_BUS_HOST1X 3
#define DRM_BUS_VIRTIO 0x10
#define DRM_NODE_PRIMARY 0
#define DRM_NODE_CONTROL 1
#define DRM_NODE_RENDER 2
#define DRM_NODE_MAX 3
typedef unsigned int drmSize, *drmSizePtr; /**< For mapped regions */
typedef void *drmAddress, **drmAddressPtr; /**< For mapped regions */
#if (__GNUC__ >= 3)
#define DRM_PRINTFLIKE(f, a) __attribute__ ((format(__printf__, f, a)))
#else
#define DRM_PRINTFLIKE(f, a)
#endif
#define MIN2( A, B ) ( (A)<(B) ? (A) : (B) )
#define MAX2( A, B ) ( (A)>(B) ? (A) : (B) )
#define MAX3( A, B, C ) ((A) > (B) ? MAX2(A, C) : MAX2(B, C))
#define __align_mask(value, mask) (((value) + (mask)) & ~(mask))
#define ALIGN(value, alignment) __align_mask(value, (__typeof__(value))((alignment) - 1))
#define DRM_PLATFORM_DEVICE_NAME_LEN 512
typedef struct _drmPciBusInfo {
uint16_t domain;
uint8_t bus;
uint8_t dev;
uint8_t func;
} drmPciBusInfo, *drmPciBusInfoPtr;
typedef struct _drmPciDeviceInfo {
uint32_t vendor_id;
uint32_t device_id;
uint32_t subvendor_id;
uint32_t subdevice_id;
uint32_t revision_id;
char driverInfo[1024];
uint64_t videoMem[4] = {};
uint64_t systemMem[4] = {};
uint64_t sharedMem[4] = {};
uint64_t ioportMem[4] = {};
uint64_t ioMem[4] = {};
} drmPciDeviceInfo, *drmPciDeviceInfoPtr;
typedef struct _drmUsbBusInfo {
uint8_t bus;
uint8_t dev;
} drmUsbBusInfo, *drmUsbBusInfoPtr;
typedef struct _drmUsbDeviceInfo {
uint16_t vendor;
uint16_t product;
} drmUsbDeviceInfo, *drmUsbDeviceInfoPtr;
typedef struct _drmPlatformBusInfo {
char fullname[DRM_PLATFORM_DEVICE_NAME_LEN + 1];
} drmPlatformBusInfo, *drmPlatformBusInfoPtr;
typedef struct _drmPlatformDeviceInfo {
char **compatible; /* NULL terminated list of compatible strings */
} drmPlatformDeviceInfo, *drmPlatformDeviceInfoPtr;
#define DRM_HOST1X_DEVICE_NAME_LEN 512
typedef struct _drmHost1xBusInfo {
char fullname[DRM_HOST1X_DEVICE_NAME_LEN + 1];
} drmHost1xBusInfo, *drmHost1xBusInfoPtr;
typedef struct _drmHost1xDeviceInfo {
char **compatible; /* NULL terminated list of compatible strings */
} drmHost1xDeviceInfo, *drmHost1xDeviceInfoPtr;
typedef struct _drmDevice {
char **nodes; /* DRM_NODE_MAX sized array */
int available_nodes; /* DRM_NODE_* bitmask */
int bustype;
union {
drmPciBusInfoPtr pci;
drmUsbBusInfoPtr usb;
drmPlatformBusInfoPtr platform;
drmHost1xBusInfoPtr host1x;
} businfo;
union {
drmPciDeviceInfoPtr pci;
drmUsbDeviceInfoPtr usb;
drmPlatformDeviceInfoPtr platform;
drmHost1xDeviceInfoPtr host1x;
} deviceinfo;
unsigned int MaxThread = 0;
unsigned int EuNumber = 0;
unsigned int TileNumber = 0;
unsigned int reserved[16];
} drmDevice, *drmDevicePtr;
/*
* The kernel drm core has a number of places that assume maximum of
* 3x64 devices nodes. That's 64 for each of primary, control and
* render nodes. Rounded it up to 256 for simplicity.
*/
#define MAX_DRM_NODES 256
inline int memcpy_s(void *dst, size_t numberOfElements, const void *src, size_t count)
{
if ((dst == nullptr) || (src == nullptr))
{
return EINVAL;
}
if (numberOfElements < count)
{
return ERANGE;
}
std::memcpy(dst, src, count);
return 0;
}
/* Check that the given flags are valid returning 0 on success */
static int
drm_device_validate_flags(uint32_t flags)
{
return (flags & ~DRM_DEVICE_GET_PCI_REVISION);
}
static int drmGetMaxNodeName(void)
{
return sizeof(DRM_DIR_NAME) +
MAX3(sizeof(DRM_PRIMARY_MINOR_NAME),
sizeof(DRM_CONTROL_MINOR_NAME),
sizeof(DRM_RENDER_MINOR_NAME)) +
3 /* length of the node number */;
}
static bool drmNodeIsDRM(int maj, int min)
{
#ifdef __linux__
char path[64];
struct stat sbuf;
snprintf(path, sizeof(path), "/sys/dev/char/%d:%d/device/drm",
maj, min);
return stat(path, &sbuf) == 0;
#else
return maj == DRM_MAJOR;
#endif
}
static int drmDevicesEqual(drmDevicePtr a, drmDevicePtr b)
{
if (a == NULL || b == NULL)
return 0;
if (a->bustype != b->bustype)
return 0;
switch (a->bustype) {
case DRM_BUS_PCI:
return memcmp(a->businfo.pci, b->businfo.pci, sizeof(drmPciBusInfo)) == 0;
case DRM_BUS_USB:
return memcmp(a->businfo.usb, b->businfo.usb, sizeof(drmUsbBusInfo)) == 0;
case DRM_BUS_PLATFORM:
return memcmp(a->businfo.platform, b->businfo.platform, sizeof(drmPlatformBusInfo)) == 0;
case DRM_BUS_HOST1X:
return memcmp(a->businfo.host1x, b->businfo.host1x, sizeof(drmHost1xBusInfo)) == 0;
default:
break;
}
return 0;
}
static drmDevicePtr drmDeviceAlloc(unsigned int type, const char *node,
size_t bus_size, size_t device_size,
char **ptrp)
{
size_t max_node_length, extra, size;
drmDevicePtr device;
unsigned int i;
char *ptr;
max_node_length = ALIGN(drmGetMaxNodeName(), sizeof(void *));
extra = DRM_NODE_MAX * (sizeof(void *) + max_node_length);
size = sizeof(*device) + extra + bus_size + device_size;
device = (drmDevicePtr)calloc(1, size);
if (!device)
return NULL;
device->available_nodes = 1 << type;
ptr = (char *)device + sizeof(*device);
device->nodes = (char **)ptr;
ptr += DRM_NODE_MAX * sizeof(void *);
for (i = 0; i < DRM_NODE_MAX; i++) {
device->nodes[i] = ptr;
ptr += max_node_length;
}
memcpy(device->nodes[type], node, max_node_length);
*ptrp = ptr;
return device;
}
static char * DRM_PRINTFLIKE(2, 3)
sysfs_uevent_get(const char *path, const char *fmt, ...)
{
char filename[PATH_MAX + 1], *key, *line = NULL, *value = NULL;
size_t size = 0, len;
ssize_t num;
va_list ap;
FILE *fp;
va_start(ap, fmt);
num = vasprintf(&key, fmt, ap);
va_end(ap);
len = num;
snprintf(filename, sizeof(filename), "%s/uevent", path);
fp = fopen(filename, "r");
if (!fp) {
free(key);
return NULL;
}
while ((num = getline(&line, &size, fp)) >= 0) {
if ((strncmp(line, key, len) == 0) && (line[len] == '=')) {
char *start = line + len + 1, *end = line + num - 1;
if (*end != '\n')
end++;
value = strndup(start, end - start);
break;
}
}
free(line);
fclose(fp);
free(key);
return value;
}
static int drmParseHost1xDeviceInfo(int maj,
int min,
drmHost1xDeviceInfoPtr info)
{
char path[PATH_MAX + 1];
int err = 0;
snprintf(path, sizeof(path), "/sys/dev/char/%d:%d/device", maj, min);
char *value = sysfs_uevent_get(path, "OF_COMPATIBLE_N");
if (!value)
{
return -ENOENT;
}
unsigned int count = 0;
int scanned_value_count = sscanf(value, "%u", &count);
free(value);
if (scanned_value_count <= 0 || 0 == count)
{
return -ENOENT;
}
info->compatible = (char**)calloc(count + 1, sizeof(*info->compatible));
if (!info->compatible)
{
return -ENOMEM;
}
unsigned int i = 0;
for (; i < count; i++)
{
value = sysfs_uevent_get(path, "OF_COMPATIBLE_%u", i);
if (!value)
{
err = -ENOENT;
goto free;
}
info->compatible[i] = value;
}
return 0;
free:
while (i--)
{
free(info->compatible[i]);
}
free(info->compatible);
return err;
}
static int drmParseHost1xBusInfo(int maj, int min, drmHost1xBusInfoPtr info)
{
char path[PATH_MAX + 1], *name;
snprintf(path, sizeof(path), "/sys/dev/char/%d:%d/device", maj, min);
name = sysfs_uevent_get(path, "OF_FULLNAME");
if (!name)
return -ENOENT;
strncpy(info->fullname, name, DRM_HOST1X_DEVICE_NAME_LEN);
info->fullname[DRM_HOST1X_DEVICE_NAME_LEN - 1] = '\0';
free(name);
return 0;
}
static int drmProcessHost1xDevice(drmDevicePtr *device,
const char *node, int node_type,
int maj, int min, bool fetch_deviceinfo,
uint32_t flags)
{
drmDevicePtr dev;
char *ptr;
int ret;
dev = drmDeviceAlloc(node_type, node, sizeof(drmHost1xBusInfo),
sizeof(drmHost1xDeviceInfo), &ptr);
if (!dev)
return -ENOMEM;
dev->bustype = DRM_BUS_HOST1X;
dev->businfo.host1x = (drmHost1xBusInfoPtr)ptr;
ret = drmParseHost1xBusInfo(maj, min, dev->businfo.host1x);
if (ret < 0)
goto free_device;
if (fetch_deviceinfo) {
ptr += sizeof(drmHost1xBusInfo);
dev->deviceinfo.host1x = (drmHost1xDeviceInfoPtr)ptr;
ret = drmParseHost1xDeviceInfo(maj, min, dev->deviceinfo.host1x);
if (ret < 0)
goto free_device;
}
*device = dev;
return 0;
free_device:
free(dev);
return ret;
}
static int drmParsePlatformBusInfo(int maj, int min, drmPlatformBusInfoPtr info)
{
char path[PATH_MAX + 1], *name;
snprintf(path, sizeof(path), "/sys/dev/char/%d:%d/device", maj, min);
name = sysfs_uevent_get(path, "OF_FULLNAME");
if (!name)
return -ENOENT;
strncpy(info->fullname, name, DRM_PLATFORM_DEVICE_NAME_LEN);
info->fullname[DRM_PLATFORM_DEVICE_NAME_LEN - 1] = '\0';
free(name);
return 0;
}
static int drmParsePlatformDeviceInfo(int maj, int min,
drmPlatformDeviceInfoPtr info)
{
char path[PATH_MAX + 1], *value;
unsigned int count, i;
int err;
snprintf(path, sizeof(path), "/sys/dev/char/%d:%d/device", maj, min);
value = sysfs_uevent_get(path, "OF_COMPATIBLE_N");
if (!value)
return -ENOENT;
sscanf(value, "%u", &count);
free(value);
if (count <= MAX_DRM_NODES)
{
info->compatible = (char**)calloc(count + 1, sizeof(*info->compatible));
}else
return -ENOENT;
if (!info->compatible)
return -ENOMEM;
for (i = 0; i < count; i++) {
value = sysfs_uevent_get(path, "OF_COMPATIBLE_%u", i);
if (!value) {
err = -ENOENT;
goto free;
}
info->compatible[i] = value;
}
return 0;
free:
while (i--)
free(info->compatible[i]);
free(info->compatible);
return err;
}
static void
get_pci_path(int maj, int min, char *pci_path)
{
char path[PATH_MAX + 1], *term;
snprintf(path, sizeof(path), "/sys/dev/char/%d:%d/device", maj, min);
if (!realpath(path, pci_path)) {
strcpy(pci_path, path);
return;
}
term = strrchr(pci_path, '/');
if (term && strncmp(term, "/virtio", 7) == 0)
*term = 0;
}
static int parse_separate_sysfs_files(int maj, int min,
drmPciDeviceInfoPtr device,
bool ignore_revision)
{
static const char *attrs[] = {
"revision", /* Older kernels are missing the file, so check for it first */
"vendor",
"device",
"subsystem_vendor",
"subsystem_device",
};
char path[PATH_MAX + 128], pci_path[PATH_MAX];
char resourcename[PATH_MAX + 64], driverpath[PATH_MAX + 64], drivername[PATH_MAX + 64], irqpath[PATH_MAX + 64];
unsigned int data[ARRAY_SIZE(attrs)];
FILE *fp;
int ret;
char *dev_path;
char *driver_name;
get_pci_path(maj, min, pci_path);
dev_path = strrchr(pci_path, '/');
dev_path++;
snprintf(driverpath, sizeof(driverpath), "%s/driver", pci_path);
snprintf(irqpath, sizeof(irqpath), "%s/irq", pci_path);
int fd = open(irqpath, O_RDONLY);
char buffer[512] ;
memset(buffer, 0, sizeof(buffer));
if (fd >= 0)
{
int count = 0;
count = read(fd, buffer, sizeof(buffer));
close(fd);
}
snprintf(resourcename, sizeof(resourcename), "%s/resource", pci_path);
if (readlink(driverpath, drivername, PATH_MAX) < 0)
printf(" readlink -errno %d\n", errno);
driver_name = strrchr(drivername, '/');
driver_name++;
snprintf(device->driverInfo, sizeof(device->driverInfo), "Driver Module %s Bus %s IRQ %s", driver_name, dev_path, buffer);
FILE*resource = fopen(resourcename, "r");
if (resource)
{
while (!feof(resource))
{
unsigned long long start, end, flags;
start = end = flags = 0;
if (fscanf(resource, "%llx %llx %llx", &start, &end, &flags) != 3)
break;
if (flags & 0x101)
{
device->ioportMem[0] = end - start + 1;
}
else
if (flags & 0x100)
{
device->ioMem[0] = end - start + 1;
}
else
if (flags & 0x200)
{
int i;
for ( i = 0; i < 4; i++)
{
if (device->videoMem[i] == 0)
{
device->videoMem[i] = end - start + 1;
break;
}
}
}
}
fclose(resource);
}
for (unsigned i = ignore_revision ? 1 : 0; i < ARRAY_SIZE(attrs); i++) {
snprintf(path, PATH_MAX + 128, "%s/%s", pci_path, attrs[i]);
fp = fopen(path, "r");
if (!fp)
return -errno;
ret = fscanf(fp, "%x", &data[i]);
fclose(fp);
if (ret != 1)
return -errno;
}
device->revision_id = ignore_revision ? 0xff : data[0] & 0xff;
device->vendor_id = data[1] & 0xffff;
device->device_id = data[2] & 0xffff;
device->subvendor_id = data[3] & 0xffff;
device->subdevice_id = data[4] & 0xffff;
return 0;
}
static int parse_config_sysfs_file(int maj, int min,
drmPciDeviceInfoPtr device)
{
char path[PATH_MAX + 128], pci_path[PATH_MAX + 1];
unsigned char config[64];
int fd, ret;
get_pci_path(maj, min, pci_path);
snprintf(path, PATH_MAX + 128, "%s/config", pci_path);
fd = open(path, O_RDONLY);
if (fd < 0)
return -errno;
ret = read(fd, config, sizeof(config));
close(fd);
if (ret < 0)
return -errno;
device->vendor_id = config[0] | (config[1] << 8);
device->device_id = config[2] | (config[3] << 8);
device->revision_id = config[8];
device->subvendor_id = config[44] | (config[45] << 8);
device->subdevice_id = config[46] | (config[47] << 8);
return 0;
}
static int drmParsePciDeviceInfo(int maj, int min,
drmPciDeviceInfoPtr device,
uint32_t flags)
{
//#ifdef __linux__
if (!(flags & DRM_DEVICE_GET_PCI_REVISION))
return parse_separate_sysfs_files(maj, min, device, true);
if (parse_separate_sysfs_files(maj, min, device, false))
return parse_config_sysfs_file(maj, min, device);
return 0;
/*
#elif defined(__OpenBSD__) || defined(__DragonFly__)
struct drm_pciinfo pinfo;
int fd, type;
type = drmGetMinorType(min);
if (type == -1)
return -ENODEV;
fd = drmOpenMinor(min, 0, type);
if (fd < 0)
return -errno;
if (drmIoctl(fd, DRM_IOCTL_GET_PCIINFO, &pinfo)) {
close(fd);
return -errno;
}
close(fd);
device->vendor_id = pinfo.vendor_id;
device->device_id = pinfo.device_id;
device->revision_id = pinfo.revision_id;
device->subvendor_id = pinfo.subvendor_id;
device->subdevice_id = pinfo.subdevice_id;
return 0;
#else
#warning "Missing implementation of drmParsePciDeviceInfo"
return -EINVAL;
#endif
*/
}
static int drmParsePciBusInfo(int maj, int min, drmPciBusInfoPtr info)
{
unsigned int domain, bus, dev, func;
char pci_path[PATH_MAX + 1], *value;
int num;
get_pci_path(maj, min, pci_path);
value = sysfs_uevent_get(pci_path, "PCI_SLOT_NAME");
if (!value)
return -ENOENT;
num = sscanf(value, "%04x:%02x:%02x.%1u", &domain, &bus, &dev, &func);
free(value);
if (num != 4)
return -EINVAL;
info->domain = domain;
info->bus = bus;
info->dev = dev;
info->func = func;
return 0;
}
static int drmProcessPlatformDevice(drmDevicePtr *device,
const char *node, int node_type,
int maj, int min, bool fetch_deviceinfo,
uint32_t flags)
{
drmDevicePtr dev;
char *ptr;
int ret;
dev = drmDeviceAlloc(node_type, node, sizeof(drmPlatformBusInfo),
sizeof(drmPlatformDeviceInfo), &ptr);
if (!dev)
return -ENOMEM;
dev->bustype = DRM_BUS_PLATFORM;
dev->businfo.platform = (drmPlatformBusInfoPtr)ptr;
ret = drmParsePlatformBusInfo(maj, min, dev->businfo.platform);
if (ret < 0)
goto free_device;
if (fetch_deviceinfo) {
ptr += sizeof(drmPlatformBusInfo);
dev->deviceinfo.platform = (drmPlatformDeviceInfoPtr)ptr;
ret = drmParsePlatformDeviceInfo(maj, min, dev->deviceinfo.platform);
if (ret < 0)
goto free_device;
}
*device = dev;
return 0;
free_device:
free(dev);
return ret;
}
static int drmProcessPciDevice(drmDevicePtr *device,
const char *node, int node_type,
int maj, int min, bool fetch_deviceinfo,
uint32_t flags)
{
drmDevicePtr dev;
char *addr;
int ret;
dev = drmDeviceAlloc(node_type, node, sizeof(drmPciBusInfo),
sizeof(drmPciDeviceInfo), &addr);
if (!dev)
return -ENOMEM;
dev->bustype = DRM_BUS_PCI;
dev->businfo.pci = (drmPciBusInfoPtr)addr;
ret = drmParsePciBusInfo(maj, min, dev->businfo.pci);
if (ret)
goto free_device;
// Fetch the device info if the user has requested it
if (fetch_deviceinfo) {
addr += sizeof(drmPciBusInfo);
dev->deviceinfo.pci = (drmPciDeviceInfoPtr)addr;
ret = drmParsePciDeviceInfo(maj, min, dev->deviceinfo.pci, flags);
if (ret)
goto free_device;
}
*device = dev;
return 0;
free_device:
free(dev);
return ret;
}
static int drmParseUsbBusInfo(int maj, int min, drmUsbBusInfoPtr info)
{
char path[PATH_MAX + 1], *value;
unsigned int bus, dev;
int ret;
snprintf(path, sizeof(path), "/sys/dev/char/%d:%d/device", maj, min);
value = sysfs_uevent_get(path, "BUSNUM");
if (!value)
return -ENOENT;
ret = sscanf(value, "%03u", &bus);
free(value);
if (ret <= 0)
return -errno;
value = sysfs_uevent_get(path, "DEVNUM");
if (!value)
return -ENOENT;
ret = sscanf(value, "%03u", &dev);
free(value);
if (ret <= 0)
return -errno;
info->bus = bus;
info->dev = dev;
return 0;
}
static int drmParseUsbDeviceInfo(int maj, int min, drmUsbDeviceInfoPtr info)
{
char path[PATH_MAX + 1], *value;
unsigned int vendor, product;
int ret;
snprintf(path, sizeof(path), "/sys/dev/char/%d:%d/device", maj, min);
value = sysfs_uevent_get(path, "PRODUCT");
if (!value)
return -ENOENT;
ret = sscanf(value, "%x/%x", &vendor, &product);
free(value);
if (ret <= 0)
return -errno;
info->vendor = vendor;
info->product = product;
return 0;
}
static int drmProcessUsbDevice(drmDevicePtr *device, const char *node,
int node_type, int maj, int min,
bool fetch_deviceinfo, uint32_t flags)
{
drmDevicePtr dev;
char *ptr;
int ret;
dev = drmDeviceAlloc(node_type, node, sizeof(drmUsbBusInfo),
sizeof(drmUsbDeviceInfo), &ptr);
if (!dev)
return -ENOMEM;
dev->bustype = DRM_BUS_USB;
dev->businfo.usb = (drmUsbBusInfoPtr)ptr;
ret = drmParseUsbBusInfo(maj, min, dev->businfo.usb);
if (ret < 0)
goto free_device;
if (fetch_deviceinfo) {
ptr += sizeof(drmUsbBusInfo);
dev->deviceinfo.usb = (drmUsbDeviceInfoPtr)ptr;
ret = drmParseUsbDeviceInfo(maj, min, dev->deviceinfo.usb);
if (ret < 0)
goto free_device;
}
*device = dev;
return 0;
free_device:
free(dev);
return ret;
}
static int drmParseSubsystemType(int maj, int min)
{
#ifdef __linux__
char path[PATH_MAX + 1];
char link[PATH_MAX + 1] = "";
char *name;
struct {
const char *name;
int bus_type;
} bus_types[] = {
{ "/pci", DRM_BUS_PCI },
{ "/usb", DRM_BUS_USB },
{ "/platform", DRM_BUS_PLATFORM },
{ "/spi", DRM_BUS_PLATFORM },
{ "/host1x", DRM_BUS_HOST1X },
{ "/virtio", DRM_BUS_VIRTIO },
};
snprintf(path, PATH_MAX, "/sys/dev/char/%d:%d/device/subsystem",
maj, min);
if (readlink(path, link, PATH_MAX) < 0)
return -errno;
name = strrchr(link, '/');
if (!name)
return -EINVAL;
for (unsigned i = 0; i < ARRAY_SIZE(bus_types); i++) {
if (strncmp(name, bus_types[i].name, strlen(bus_types[i].name)) == 0)
return bus_types[i].bus_type;
}
return -EINVAL;
#elif defined(__OpenBSD__) || defined(__DragonFly__)
return DRM_BUS_PCI;
#else
#warning "Missing implementation of drmParseSubsystemType"
return -EINVAL;
#endif
}
static void drmFreePlatformDevice(drmDevicePtr device)
{
if (device->deviceinfo.platform) {
if (device->deviceinfo.platform->compatible) {
char **compatible = device->deviceinfo.platform->compatible;
while (*compatible) {
free(*compatible);
compatible++;
}
free(device->deviceinfo.platform->compatible);
}
}
}
static void drmFreeHost1xDevice(drmDevicePtr device)
{
if (device->deviceinfo.host1x) {
if (device->deviceinfo.host1x->compatible) {
char **compatible = device->deviceinfo.host1x->compatible;
while (*compatible) {
free(*compatible);
compatible++;
}
free(device->deviceinfo.host1x->compatible);
}
}
}
static int drmGetNodeType(const char *name)
{
if (strncmp(name, DRM_PRIMARY_MINOR_NAME,
sizeof(DRM_PRIMARY_MINOR_NAME) - 1) == 0)
return DRM_NODE_PRIMARY;
if (strncmp(name, DRM_CONTROL_MINOR_NAME,
sizeof(DRM_CONTROL_MINOR_NAME) - 1) == 0)
return DRM_NODE_CONTROL;
if (strncmp(name, DRM_RENDER_MINOR_NAME,
sizeof(DRM_RENDER_MINOR_NAME) - 1) == 0)
return DRM_NODE_RENDER;
return -EINVAL;
}
void drmFreeDevice(drmDevicePtr *device)
{
if (device == NULL)
return;
if (*device) {
switch ((*device)->bustype) {
case DRM_BUS_PLATFORM:
drmFreePlatformDevice(*device);
break;
case DRM_BUS_HOST1X:
drmFreeHost1xDevice(*device);
break;
}
}
free(*device);
*device = NULL;
}
static int
process_device(drmDevicePtr *device, const char *d_name,
int req_subsystem_type,
bool fetch_deviceinfo, uint32_t flags)
{
struct stat sbuf;
char node[PATH_MAX + 1];
int node_type, subsystem_type;
unsigned int maj, min;
node_type = drmGetNodeType(d_name);
if (node_type < 0)
return -1;
snprintf(node, PATH_MAX, "%s/%s", DRM_DIR_NAME, d_name);
if (stat(node, &sbuf))
return -1;
maj = major(sbuf.st_rdev);
min = minor(sbuf.st_rdev);
if (!drmNodeIsDRM(maj, min) || !S_ISCHR(sbuf.st_mode))
{
return -1;
}
subsystem_type = drmParseSubsystemType(maj, min);
if (req_subsystem_type != -1 && req_subsystem_type != subsystem_type)
return -1;
switch (subsystem_type) {
case DRM_BUS_PCI:
case DRM_BUS_VIRTIO:
return drmProcessPciDevice(device, node, node_type, maj, min,
fetch_deviceinfo, flags);
case DRM_BUS_USB:
return drmProcessUsbDevice(device, node, node_type, maj, min,
fetch_deviceinfo, flags);
case DRM_BUS_PLATFORM:
return drmProcessPlatformDevice(device, node, node_type, maj, min,
fetch_deviceinfo, flags);
case DRM_BUS_HOST1X:
return drmProcessHost1xDevice(device, node, node_type, maj, min,
fetch_deviceinfo, flags);
default:
return -1;
}
}
/* Consider devices located on the same bus as duplicate and fold the respective
* entries into a single one.
*
* Note: this leaves "gaps" in the array, while preserving the length.
*/
static void drmFoldDuplicatedDevices(drmDevicePtr local_devices[], int count)
{
int node_type, i, j;
for (i = 0; i < count; i++) {
for (j = i + 1; j < count; j++) {
if (drmDevicesEqual(local_devices[i], local_devices[j])) {
local_devices[i]->available_nodes |= local_devices[j]->available_nodes;
node_type = log2(local_devices[j]->available_nodes);
memcpy(local_devices[i]->nodes[node_type],
local_devices[j]->nodes[node_type], drmGetMaxNodeName());
drmFreeDevice(&local_devices[j]);
}
}
}
}
/**
* Get drm devices on the system
*
* \param flags feature/behaviour bitmask
* \param devices the array of devices with drmDevicePtr elements
* can be NULL to get the device number first
* \param max_devices the maximum number of devices for the array
*
* \return on error - negative error code,
* if devices is NULL - total number of devices available on the system,
* alternatively the number of devices stored in devices[], which is
* capped by the max_devices.
*
* \note Unlike drmGetDevices it does not retrieve the pci device revision field
* unless the DRM_DEVICE_GET_PCI_REVISION \p flag is set.
*/
int drmGetDevices2(uint32_t flags, drmDevicePtr devices[],
int max_devices)
{
drmDevicePtr local_devices[MAX_DRM_NODES];
drmDevicePtr device;
DIR *sysdir;
struct dirent *dent;
int ret, i, node_count, device_count;
if (drm_device_validate_flags(flags))
return -EINVAL;
sysdir = opendir(DRM_DIR_NAME);
if (!sysdir)
return -errno;
i = 0;
while ((dent = readdir(sysdir))) {
ret = process_device(&device, dent->d_name, -1, devices != NULL, flags);
if (ret)
continue;
if (i >= MAX_DRM_NODES) {
fprintf(stderr, "More than %d drm nodes detected. "
"Please report - that should not happen.\n"
"Skipping extra nodes\n", MAX_DRM_NODES);
break;
}
local_devices[i] = device;
i++;
}
node_count = i;
drmFoldDuplicatedDevices(local_devices, node_count);
device_count = 0;
for (i = 0; i < node_count; i++) {
if (!local_devices[i])
continue;
if ((devices != NULL) && (device_count < max_devices))
devices[device_count] = local_devices[i];
else
drmFreeDevice(&local_devices[i]);
device_count++;
}
closedir(sysdir);
return device_count;
}
/**
* Get drm devices on the system
*
* \param devices the array of devices with drmDevicePtr elements
* can be NULL to get the device number first
* \param max_devices the maximum number of devices for the array
*
* \return on error - negative error code,
* if devices is NULL - total number of devices available on the system,
* alternatively the number of devices stored in devices[], which is
* capped by the max_devices.
*/
int drmGetDevices(drmDevicePtr devices[], int max_devices)
{
return drmGetDevices2(DRM_DEVICE_GET_PCI_REVISION, devices, max_devices);
}
static int32_t GetRendererFileDescriptor(char * drm_node)
{
int32_t driFileDescriptor = -1;
driFileDescriptor = open(drm_node, O_RDWR);
return driFileDescriptor;
}
#endif // #ifndef DRM_DEVICE_H_