From 0816e8fca6194dfb4cc94c3a7fcb2c7f2a921386 Mon Sep 17 00:00:00 2001 From: Adam Jackson Date: Tue, 18 Sep 2018 14:37:51 -0400 Subject: [PATCH xserver] linux: Make platform device probe less fragile At the point where xf86BusProbe runs we haven't yet taken our own VT, which means we can't perform drm "master" operations on the device. This is tragic, because we need master to fish the bus id string out of the kernel, which we can only do after drmSetInterfaceVersion, which for some reason stores that string on the device not the file handle and thus needs master access. Fortunately we know the format of the busid string, and it happens to almost be the same as the ID_PATH variable from udev. Use that instead and stop calling drmSetInterfaceVersion. Reviewed-by: Peter Hutterer Signed-off-by: Adam Jackson --- config/udev.c | 17 ++++++++++++----- hw/xfree86/os-support/linux/lnx_platform.c | 20 ++------------------ 2 files changed, 14 insertions(+), 23 deletions(-) diff --git a/config/udev.c b/config/udev.c index 3a73189e25..8c6c4b6665 100644 --- a/config/udev.c +++ b/config/udev.c @@ -56,7 +56,7 @@ static struct udev_monitor *udev_monitor; #ifdef CONFIG_UDEV_KMS static void -config_udev_odev_setup_attribs(const char *path, const char *syspath, +config_udev_odev_setup_attribs(struct udev_device *udev_device, const char *path, const char *syspath, int major, int minor, config_odev_probe_proc_ptr probe_callback); #endif @@ -128,7 +128,7 @@ device_added(struct udev_device *udev_device) LogMessage(X_INFO, "config/udev: Adding drm device (%s)\n", path); - config_udev_odev_setup_attribs(path, syspath, major(devnum), + config_udev_odev_setup_attribs(udev_device, path, syspath, major(devnum), minor(devnum), NewGPUDeviceRequest); return; } @@ -322,7 +322,7 @@ device_removed(struct udev_device *device) LogMessage(X_INFO, "config/udev: removing GPU device %s %s\n", syspath, path); - config_udev_odev_setup_attribs(path, syspath, major(devnum), + config_udev_odev_setup_attribs(device, path, syspath, major(devnum), minor(devnum), DeleteGPUDeviceRequest); /* Retry vtenter after a drm node removal */ systemd_logind_vtenter(); @@ -465,17 +465,24 @@ config_udev_fini(void) #ifdef CONFIG_UDEV_KMS static void -config_udev_odev_setup_attribs(const char *path, const char *syspath, +config_udev_odev_setup_attribs(struct udev_device *udev_device, const char *path, const char *syspath, int major, int minor, config_odev_probe_proc_ptr probe_callback) { struct OdevAttributes *attribs = config_odev_allocate_attributes(); + const char *value; attribs->path = XNFstrdup(path); attribs->syspath = XNFstrdup(syspath); attribs->major = major; attribs->minor = minor; + value = udev_device_get_property_value(udev_device, "ID_PATH"); + if (value && !strncmp(value, "pci-", 4)) { + attribs->busid = XNFstrdup(value); + attribs->busid[3] = ':'; + } + /* ownership of attribs is passed to probe layer */ probe_callback(attribs); } @@ -516,7 +523,7 @@ config_udev_odev_probe(config_odev_probe_proc_ptr probe_callback) else if (!check_seat(udev_device)) goto no_probe; - config_udev_odev_setup_attribs(path, syspath, major(devnum), + config_udev_odev_setup_attribs(udev_device, path, syspath, major(devnum), minor(devnum), probe_callback); no_probe: udev_device_unref(udev_device); diff --git a/hw/xfree86/os-support/linux/lnx_platform.c b/hw/xfree86/os-support/linux/lnx_platform.c index 70374ace88..e623062192 100644 --- a/hw/xfree86/os-support/linux/lnx_platform.c +++ b/hw/xfree86/os-support/linux/lnx_platform.c @@ -23,13 +23,13 @@ static Bool get_drm_info(struct OdevAttributes *attribs, char *path, int delayed_index) { - drmSetVersion sv; drmVersionPtr v; - char *buf; int fd; int err = 0; Bool paused, server_fd = FALSE; + LogMessage(X_INFO, "Platform probe for %s\n", attribs->syspath); + fd = systemd_logind_take_fd(attribs->major, attribs->minor, path, &paused); if (fd != -1) { if (paused) { @@ -48,18 +48,6 @@ get_drm_info(struct OdevAttributes *attribs, char *path, int delayed_index) if (fd == -1) return FALSE; - sv.drm_di_major = 1; - sv.drm_di_minor = 4; - sv.drm_dd_major = -1; /* Don't care */ - sv.drm_dd_minor = -1; /* Don't care */ - - err = drmSetInterfaceVersion(fd, &sv); - if (err) { - xf86Msg(X_ERROR, "%s: failed to set DRM interface version 1.4: %s\n", - path, strerror(-err)); - goto out; - } - /* for a delayed probe we've already added the device */ if (delayed_index == -1) { xf86_add_platform_device(attribs, FALSE); @@ -69,10 +57,6 @@ get_drm_info(struct OdevAttributes *attribs, char *path, int delayed_index) if (server_fd) xf86_platform_devices[delayed_index].flags |= XF86_PDEV_SERVER_FD; - buf = drmGetBusid(fd); - xf86_platform_odev_attributes(delayed_index)->busid = XNFstrdup(buf); - drmFreeBusid(buf); - v = drmGetVersion(fd); if (!v) { xf86Msg(X_ERROR, "%s: failed to query DRM version\n", path); -- 2.19.1