Commit a0290013 authored by Emil Velikov's avatar Emil Velikov Committed by Emil Velikov
Browse files

xf86drm: introduce a get_real_pci_path() helper



Introduce a helper which gets the real sysfs path for the given pci
device.

In other words, instead opening the /sys/dev/char/*/device symlink, we
opt for the actual /sys/devices/pci*/*/

It folds three (nearly identical) snprintf's and paves the way of adding
extra devices (see next patch) a piece of pie.

v2: use a caller (on stack) provided real_path (Eric)
Signed-off-by: Emil Velikov's avatarEmil Velikov <emil.velikov@collabora.com>
Tested-by: Robert Foss <robert.foss@collabora.com> (v1)
Reviewed-by: Robert Foss <robert.foss@collabora.com> (v1)
Reviewed-by: Eric Engestrom <eric@engestrom.ch> (v1)
parent 95b262f0
......@@ -2992,16 +2992,29 @@ static int drmParseSubsystemType(int maj, int min)
#endif
}
static char *
get_real_pci_path(int maj, int min, char *real_path)
{
char path[PATH_MAX + 1];
snprintf(path, sizeof(path), "/sys/dev/char/%d:%d/device", maj, min);
if (!realpath(path, real_path))
return NULL;
return real_path;
}
static int drmParsePciBusInfo(int maj, int min, drmPciBusInfoPtr info)
{
#ifdef __linux__
unsigned int domain, bus, dev, func;
char path[PATH_MAX + 1], *value;
char real_path[PATH_MAX + 1], *value;
int num;
snprintf(path, sizeof(path), "/sys/dev/char/%d:%d/device", maj, min);
if (get_real_pci_path(maj, min, real_path) == NULL)
return -ENOENT;
value = sysfs_uevent_get(path, "PCI_SLOT_NAME");
value = sysfs_uevent_get(real_path, "PCI_SLOT_NAME");
if (!value)
return -ENOENT;
......@@ -3114,14 +3127,16 @@ static int parse_separate_sysfs_files(int maj, int min,
"subsystem_vendor",
"subsystem_device",
};
char path[PATH_MAX + 1];
char path[PATH_MAX + 1], real_path[PATH_MAX + 1];
unsigned int data[ARRAY_SIZE(attrs)];
FILE *fp;
int ret;
if (get_real_pci_path(maj, min, real_path) == NULL)
return -ENOENT;
for (unsigned i = ignore_revision ? 1 : 0; i < ARRAY_SIZE(attrs); i++) {
snprintf(path, PATH_MAX, "/sys/dev/char/%d:%d/device/%s", maj, min,
attrs[i]);
snprintf(path, PATH_MAX, "%s/%s", real_path, attrs[i]);
fp = fopen(path, "r");
if (!fp)
return -errno;
......@@ -3145,11 +3160,14 @@ static int parse_separate_sysfs_files(int maj, int min,
static int parse_config_sysfs_file(int maj, int min,
drmPciDeviceInfoPtr device)
{
char path[PATH_MAX + 1];
char path[PATH_MAX + 1], real_path[PATH_MAX + 1];
unsigned char config[64];
int fd, ret;
snprintf(path, PATH_MAX, "/sys/dev/char/%d:%d/device/config", maj, min);
if (get_real_pci_path(maj, min, real_path) == NULL)
return -ENOENT;
snprintf(path, PATH_MAX, "%s/config", real_path);
fd = open(path, O_RDONLY);
if (fd < 0)
return -errno;
......
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