On 22/05/14 05:01, Gary Wong wrote:
> 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).
>
Imo the sysfs_get_device_name_for_fd() function looks rather messy, but
luckily most people will never hit it so :)
With that said, this patch is
Acked-by: Emil Velikov <emil.l.veli...@gmail.com>
I will give it a week or so for other people to chip in before pushing these
to master.
Thanks for your contribution.
Emil
P.S. If you use --in-reply-to, --chain-reply-to you'll have greater chances of
patches not getting lost :)
> Signed-off-by: Gary Wong <g...@gnu.org>
> ---
> configure.ac | 36 +++++++++++------
> src/loader/loader.c | 112
> ++++++++++++++++++++++++++++++++++++++++++++++++++++
> 2 files changed, 137 insertions(+), 11 deletions(-)
>
> diff --git a/configure.ac b/configure.ac
> index 4e4d761..95f0e16 100644
> --- a/configure.ac
> +++ b/configure.ac
> @@ -818,14 +818,21 @@ fi
>
> case "$host_os" in
> linux*)
> - need_libudev=yes ;;
> + need_pci_id=yes ;;
> *)
> - need_libudev=no ;;
> + need_pci_id=no ;;
> esac
>
> PKG_CHECK_MODULES([LIBUDEV], [libudev >= $LIBUDEV_REQUIRED],
> have_libudev=yes, have_libudev=no)
>
> +AC_ARG_ENABLE([sysfs],
> + [AS_HELP_STRING([--enable-sysfs],
> + [enable /sys PCI identification @<:@default=disabled@:>@])],
> + [have_sysfs="$enableval"],
> + [have_sysfs=no]
> +)
> +
> if test "x$enable_dri" = xyes; then
> if test "$enable_static" = yes; then
> AC_MSG_ERROR([Cannot use static libraries for DRI drivers])
> @@ -910,8 +917,15 @@ xyesno)
> ;;
> esac
>
> +have_pci_id=no
> if test "$have_libudev" = yes; then
> DEFINES="$DEFINES -DHAVE_LIBUDEV"
> + have_pci_id=yes
> +fi
> +
> +if test "$have_sysfs" = yes; then
> + DEFINES="$DEFINES -DHAVE_SYSFS"
> + have_pci_id=yes
> fi
>
> # This is outside the case (above) so that it is invoked even for non-GLX
> @@ -1013,8 +1027,8 @@ if test "x$enable_dri" = xyes; then
> DEFINES="$DEFINES -DHAVE_DRI3"
> fi
>
> - if test "x$have_libudev" != xyes; then
> - AC_MSG_ERROR([libudev-dev required for building DRI])
> + if test "x$have_pci_id" != xyes; then
> + AC_MSG_ERROR([libudev-dev or sysfs required for building DRI])
> fi
>
> case "$host_cpu" in
> @@ -1183,8 +1197,8 @@ if test "x$enable_gbm" = xauto; then
> esac
> fi
> if test "x$enable_gbm" = xyes; then
> - if test "x$need_libudev$have_libudev" = xyesno; then
> - AC_MSG_ERROR([gbm requires udev >= $LIBUDEV_REQUIRED])
> + if test "x$need_pci_id$have_pci_id" = xyesno; then
> + AC_MSG_ERROR([gbm requires udev >= $LIBUDEV_REQUIRED or sysfs])
> fi
>
> if test "x$enable_dri" = xyes; then
> @@ -1202,7 +1216,7 @@ if test "x$enable_gbm" = xyes; then
> fi
> fi
> AM_CONDITIONAL(HAVE_GBM, test "x$enable_gbm" = xyes)
> -if test "x$need_libudev" = xyes; then
> +if test "x$need_pci_id$have_libudev" = xyesyes; then
> GBM_PC_REQ_PRIV="libudev >= $LIBUDEV_REQUIRED"
> else
> GBM_PC_REQ_PRIV=""
> @@ -1491,9 +1505,9 @@ for plat in $egl_platforms; do
> ;;
> esac
>
> - case "$plat$need_libudev$have_libudev" in
> + case "$plat$need_pci_id$have_pci_id" in
> waylandyesno|drmyesno)
> - AC_MSG_ERROR([cannot build $plat platform without udev
> >= $LIBUDEV_REQUIRED]) ;;
> + AC_MSG_ERROR([cannot build $plat platform without udev
> >= $LIBUDEV_REQUIRED or sysfs]) ;;
> esac
> done
>
> @@ -1766,8 +1780,8 @@ gallium_require_llvm() {
>
> gallium_require_drm_loader() {
> if test "x$enable_gallium_loader" = xyes; then
> - if test "x$need_libudev$have_libudev" = xyesno; then
> - AC_MSG_ERROR([Gallium drm loader requires libudev >=
> $LIBUDEV_REQUIRED])
> + if test "x$need_pci_id$have_pci_id" = xyesno; then
> + AC_MSG_ERROR([Gallium drm loader requires libudev >=
> $LIBUDEV_REQUIRED or sysfs])
> fi
> if test "x$have_libdrm" != xyes; then
> AC_MSG_ERROR([Gallium drm loader requires libdrm >=
> $LIBDRM_REQUIRED])
> diff --git a/src/loader/loader.c b/src/loader/loader.c
> index 52be706..0f26265 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;
> }
>
>
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