diff options
author | Marcin Bernatowicz <marcin.bernatowicz@intel.com> | 2020-07-07 16:58:17 +0200 |
---|---|---|
committer | Janusz Krzysztofik <janusz.krzysztofik@linux.intel.com> | 2020-07-23 09:10:12 +0200 |
commit | ecac989b30186f89e13e2bb18c11f7afcf0dc950 (patch) | |
tree | cc45e06c5fb623ca1105d89854cc9456b85d0499 /tests/device_reset.c | |
parent | 89ef04d90cf2b96c72820c1927034cf716ea37f7 (diff) |
tests/device_reset: Test device sysfs reset
Device reset is initiated by writing "1" to reset sysfs file,
which should initiate PCI device Function Level Reset
if supported by device.
Test scenarios:
1. unbind driver from device, initiate sysfs reset, rebind driver to
device
2. device reset with bound driver
v2: removed unbind-rebind (duplicates core_hotunplug@unbind-rebind)
added healthcheck to each test (Janusz)
v3: after review corrections (renamed sysfs_fds to device_fds,
corrected not closed file descriptor, removed variable length array)
v4: updated description (Martin), snprintf corrections (Janusz),
reset-bound added to blacklist as it hangs several gens of hosts (Tomi)
Signed-off-by: Marcin Bernatowicz <marcin.bernatowicz@intel.com>
Reviewed-by: Janusz Krzysztofik <janusz.krzysztofik@linux.intel.com>
Acked-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Janusz Krzysztofik <janusz.krzysztofik@linux.intel.com>
Diffstat (limited to 'tests/device_reset.c')
-rw-r--r-- | tests/device_reset.c | 281 |
1 files changed, 281 insertions, 0 deletions
diff --git a/tests/device_reset.c b/tests/device_reset.c new file mode 100644 index 00000000..b1181b3b --- /dev/null +++ b/tests/device_reset.c @@ -0,0 +1,281 @@ +// SPDX-License-Identifier: MIT +/* + * Copyright(c) 2020 Intel Corporation. All rights reserved. + */ +#include <fcntl.h> +#include <sys/ioctl.h> +#include <sys/stat.h> + +#include "i915/gem.h" +#include "igt.h" +#include "igt_device_scan.h" +#include "igt_sysfs.h" + +IGT_TEST_DESCRIPTION("Examine behavior of a driver on device sysfs reset"); + + +#define DEV_PATH_LEN 80 +#define DEV_BUS_ADDR_LEN 13 /* addr has form 0000:00:00.0 */ + +/** + * Helper structure containing file descriptors + * and bus address related to tested device + */ +struct device_fds { + struct { + int dev; + int dev_dir; + int drv_dir; + } fds; + char dev_bus_addr[DEV_BUS_ADDR_LEN]; +}; + +static int __open_sysfs_dir(int fd, const char* path) +{ + int sysfs; + + sysfs = igt_sysfs_open(fd); + if (sysfs < 0) { + return -1; + } + + fd = openat(sysfs, path, O_DIRECTORY); + close(sysfs); + return fd; +} + +static int open_device_sysfs_dir(int fd) +{ + return __open_sysfs_dir(fd, "device"); +} + +static int open_driver_sysfs_dir(int fd) +{ + return __open_sysfs_dir(fd, "device/driver"); +} + +/** + * device_sysfs_path: + * @fd: opened device file descriptor + * @path: buffer to store sysfs path to device directory + * + * Returns: + * On successfull path resolution sysfs path to device directory, + * NULL otherwise + */ +static char *device_sysfs_path(int fd, char *path) +{ + char sysfs[DEV_PATH_LEN]; + + if (!igt_sysfs_path(fd, sysfs, sizeof(sysfs))) + return NULL; + + if (DEV_PATH_LEN <= (strlen(sysfs) + strlen("/device"))) + return NULL; + + strcat(sysfs, "/device"); + + return realpath(sysfs, path); +} + +static void init_device_fds(struct device_fds *dev) +{ + char dev_path[PATH_MAX]; + char *addr_pos; + + igt_debug("open device\n"); + /** + * As subtests must be able to close examined devices + * completely, don't use drm_open_driver() as it keeps + * a device file descriptor open for exit handler use. + */ + dev->fds.dev = __drm_open_driver(DRIVER_ANY); + igt_assert_fd(dev->fds.dev); + if (is_i915_device(dev->fds.dev)) + igt_require_gem(dev->fds.dev); + + igt_assert(device_sysfs_path(dev->fds.dev, dev_path)); + addr_pos = strrchr(dev_path, '/'); + igt_assert(addr_pos); + igt_assert_eq(sizeof(dev->dev_bus_addr) - 1, + snprintf(dev->dev_bus_addr, sizeof(dev->dev_bus_addr), + "%s", addr_pos + 1)); + + dev->fds.dev_dir = open_device_sysfs_dir(dev->fds.dev); + igt_assert_fd(dev->fds.dev_dir); + + dev->fds.drv_dir = open_driver_sysfs_dir(dev->fds.dev); + igt_assert_fd(dev->fds.drv_dir); +} + +static int close_if_opened(int *fd) +{ + int rc = 0; + + if (fd && *fd != -1) { + rc = close(*fd); + *fd = -1; + } + return rc; +} + +static void cleanup_device_fds(struct device_fds *dev) +{ + igt_ignore_warn(close_if_opened(&dev->fds.dev)); + igt_ignore_warn(close_if_opened(&dev->fds.dev_dir)); + igt_ignore_warn(close_if_opened(&dev->fds.drv_dir)); +} + +/** + * is_sysfs_reset_supported: + * @fd: opened device file descriptor + * + * Check if device supports reset based on sysfs file presence. + * + * Returns: + * True if device supports reset, false otherwise. + */ +static bool is_sysfs_reset_supported(int fd) +{ + struct stat st; + int rc; + int sysfs; + int reset_fd = -1; + + sysfs = igt_sysfs_open(fd); + + if (sysfs >= 0) { + reset_fd = openat(sysfs, "device/reset", O_WRONLY); + close(sysfs); + } + + if (reset_fd < 0) + return false; + + rc = fstat(reset_fd, &st); + close(reset_fd); + + if (rc || !S_ISREG(st.st_mode)) + return false; + + return true; +} + +/* Unbind the driver from the device */ +static void driver_unbind(struct device_fds *dev) +{ + igt_debug("unbind the driver from the device\n"); + igt_assert(igt_sysfs_set(dev->fds.drv_dir, "unbind", + dev->dev_bus_addr)); +} + +/* Re-bind the driver to the device */ +static void driver_bind(struct device_fds *dev) +{ + igt_debug("rebind the driver to the device\n"); + igt_abort_on_f(!igt_sysfs_set(dev->fds.drv_dir, "bind", + dev->dev_bus_addr), "driver rebind failed"); +} + +/* Initiate device reset */ +static void initiate_device_reset(struct device_fds *dev) +{ + igt_debug("reset device\n"); + igt_assert(igt_sysfs_set(dev->fds.dev_dir, "reset", "1")); +} + +static bool is_i915_wedged(int i915) +{ + int err = 0; + + if (ioctl(i915, DRM_IOCTL_I915_GEM_THROTTLE)) + err = -errno; + return err == -EIO; +} + +/** + * healthcheck: + * @dev: structure with device descriptor, if descriptor equals -1 + * the device is reopened + */ +static void healthcheck(struct device_fds *dev) +{ + if (dev->fds.dev == -1) { + /* refresh device list */ + igt_devices_scan(true); + igt_debug("reopen the device\n"); + dev->fds.dev = __drm_open_driver(DRIVER_ANY); + } + igt_assert_fd(dev->fds.dev); + + if (is_i915_device(dev->fds.dev)) + igt_assert(!is_i915_wedged(dev->fds.dev)); +} + +/** + * set_device_filter: + * + * Sets device filter to ensure subtests always reopen the same device + * + * @dev_path: path to device under tests + */ +static void set_device_filter(const char* dev_path) +{ +#define FILTER_PREFIX_LEN 4 + char filter[PATH_MAX + FILTER_PREFIX_LEN]; + + igt_assert_lt(FILTER_PREFIX_LEN, snprintf(filter, sizeof(filter), + "sys:%s", dev_path)); + igt_device_filter_free_all(); + igt_assert_eq(igt_device_filter_add(filter), 1); +} + +static void unbind_reset_rebind(struct device_fds *dev) +{ + igt_debug("close the device\n"); + close_if_opened(&dev->fds.dev); + + driver_unbind(dev); + + initiate_device_reset(dev); + + driver_bind(dev); +} + +igt_main +{ + struct device_fds dev = { .fds = {-1, -1, -1}, .dev_bus_addr = {0}}; + + igt_fixture { + char dev_path[PATH_MAX]; + + igt_debug("opening device\n"); + init_device_fds(&dev); + + /* Make sure subtests always reopen the same device */ + igt_assert(device_sysfs_path(dev.fds.dev, dev_path)); + set_device_filter(dev_path); + + igt_skip_on(!is_sysfs_reset_supported(dev.fds.dev)); + + igt_set_timeout(60, "device reset tests timed out after 60s"); + } + + igt_describe("Unbinds driver from device, initiates reset" + " then rebinds driver to device"); + igt_subtest("unbind-reset-rebind") { + unbind_reset_rebind(&dev); + healthcheck(&dev); + } + + igt_describe("Resets device with bound driver"); + igt_subtest("reset-bound") { + initiate_device_reset(&dev); + healthcheck(&dev); + } + + igt_fixture { + igt_reset_timeout(); + cleanup_device_fds(&dev); + } +} |