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authorGary Wong <gtw@gnu.org>2014-05-21 21:07:42 -0600
committerGary Wong <gtw@gnu.org>2014-05-29 20:25:37 -0600
commit85b6f36ca5238dd3fec7c5fcacb8b7074ce53c8e (patch)
tree5b33791f4c28a62878bb6dc96519bed6a66fe938 /src/loader/loader.c
parent090c772b8ac50c99e293862b496344a7ab8d297e (diff)
loader: add optional /sys filesystem method for PCI identification.
Introduce a simple PCI identification method of looking up the answer the /sys filesystem (available on Linux). Attempted after libudev, but before DRM. Disabled by default (available only when the --enable-sysfs configure option is specified). Signed-off-by: Gary Wong <gtw@gnu.org> Acked-by: Emil Velikov <emil.l.velikov@gmail.com>
Diffstat (limited to 'src/loader/loader.c')
-rw-r--r--src/loader/loader.c112
1 files changed, 112 insertions, 0 deletions
diff --git a/src/loader/loader.c b/src/loader/loader.c
index 52be7061c1..0f262653b2 100644
--- a/src/loader/loader.c
+++ b/src/loader/loader.c
@@ -71,6 +71,10 @@
#include <assert.h>
#include <dlfcn.h>
#endif
+#ifdef HAVE_SYSFS
+#include <sys/stat.h>
+#include <sys/types.h>
+#endif
#include "loader.h"
#ifndef __NOT_HAVE_DRM_H
@@ -212,6 +216,66 @@ out:
}
#endif
+#if defined(HAVE_SYSFS)
+static int
+dev_node_from_fd(int fd, unsigned int *maj, unsigned int *min)
+{
+ struct stat buf;
+
+ if (fstat(fd, &buf) < 0) {
+ log_(_LOADER_WARNING, "MESA-LOADER: failed to stat fd %d\n", fd);
+ return -1;
+ }
+
+ if (!S_ISCHR(buf.st_mode)) {
+ log_(_LOADER_WARNING, "MESA-LOADER: fd %d not a character device\n", fd);
+ return -1;
+ }
+
+ *maj = major(buf.st_rdev);
+ *min = minor(buf.st_rdev);
+
+ return 0;
+}
+
+static int
+sysfs_get_pci_id_for_fd(int fd, int *vendor_id, int *chip_id)
+{
+ unsigned int maj, min;
+ FILE *f;
+ char buf[0x40];
+
+ if (dev_node_from_fd(fd, &maj, &min) < 0) {
+ *chip_id = -1;
+ return 0;
+ }
+
+ snprintf(buf, sizeof(buf), "/sys/dev/char/%d:%d/device/vendor", maj, min);
+ if (!(f = fopen(buf, "r"))) {
+ *chip_id = -1;
+ return 0;
+ }
+ if (fscanf(f, "%x", vendor_id) != 1) {
+ *chip_id = -1;
+ fclose(f);
+ return 0;
+ }
+ fclose(f);
+ snprintf(buf, sizeof(buf), "/sys/dev/char/%d:%d/device/device", maj, min);
+ if (!(f = fopen(buf, "r"))) {
+ *chip_id = -1;
+ return 0;
+ }
+ if (fscanf(f, "%x", chip_id) != 1) {
+ *chip_id = -1;
+ fclose(f);
+ return 0;
+ }
+ fclose(f);
+ return 1;
+}
+#endif
+
#if !defined(__NOT_HAVE_DRM_H)
/* for i915 */
#include <i915_drm.h>
@@ -291,6 +355,10 @@ loader_get_pci_id_for_fd(int fd, int *vendor_id, int *chip_id)
if (libudev_get_pci_id_for_fd(fd, vendor_id, chip_id))
return 1;
#endif
+#if HAVE_SYSFS
+ if (sysfs_get_pci_id_for_fd(fd, vendor_id, chip_id))
+ return 1;
+#endif
#if !defined(__NOT_HAVE_DRM_H)
if (drm_get_pci_id_for_fd(fd, vendor_id, chip_id))
return 1;
@@ -332,6 +400,46 @@ out:
#endif
+#if HAVE_SYSFS
+static char *
+sysfs_get_device_name_for_fd(int fd)
+{
+ char *device_name = NULL;
+ unsigned int maj, min;
+ FILE *f;
+ char buf[0x40];
+ static const char match[9] = "\0DEVNAME=";
+ int expected = 1;
+
+ if (dev_node_from_fd(fd, &maj, &min) < 0)
+ return NULL;
+
+ snprintf(buf, sizeof(buf), "/sys/dev/char/%d:%d/uevent", maj, min);
+ if (!(f = fopen(buf, "r")))
+ return NULL;
+
+ while (expected < sizeof(match)) {
+ int c = getc(f);
+
+ if (c == EOF) {
+ fclose(f);
+ return NULL;
+ } else if (c == match[expected] )
+ expected++;
+ else
+ expected = 0;
+ }
+
+ strcpy(buf, "/dev/");
+ if (fgets(buf + 5, sizeof(buf) - 5, f))
+ device_name = strdup(buf);
+
+ fclose(f);
+ return device_name;
+}
+#endif
+
+
char *
loader_get_device_name_for_fd(int fd)
{
@@ -341,6 +449,10 @@ loader_get_device_name_for_fd(int fd)
if ((result = libudev_get_device_name_for_fd(fd)))
return result;
#endif
+#if HAVE_SYSFS
+ if ((result = sysfs_get_device_name_for_fd(fd)))
+ return result;
+#endif
return result;
}