[igt-dev] [RFC,i-g-t] tests/device_reset: Test device sysfs reset
Marcin Bernatowicz
marcin.bernatowicz at intel.com
Fri Jun 26 06:30:45 UTC 2020
Device reset is initiated by writing "1" to reset sysfs file,
which should initiatie device FLR if supported by device.
Test scenarios:
1. unbind driver from device then rebind
2. unbind driver from device, initiate sysfs reset, rebind driver to
device
3. device reset with bound driver
Signed-off-by: Marcin Bernatowicz <marcin.bernatowicz at intel.com>
---
tests/device_reset.c | 298 +++++++++++++++++++++++++++++++++++++++++++
tests/meson.build | 1 +
2 files changed, 299 insertions(+)
create mode 100644 tests/device_reset.c
diff --git a/tests/device_reset.c b/tests/device_reset.c
new file mode 100644
index 000000000..bafe9fd41
--- /dev/null
+++ b/tests/device_reset.c
@@ -0,0 +1,298 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright(c) 2020 Intel Corporation. All rights reserved.
+ */
+
+#include <fcntl.h>
+#include <sys/stat.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 sysfs file descriptors
+ * and path related to tested device
+ */
+struct sysfs_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;
+ }
+
+ return openat(sysfs, path, O_DIRECTORY);
+}
+
+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_sysfs_fds(struct sysfs_fds *sysfs)
+{
+ 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.
+ */
+ sysfs->fds.dev = __drm_open_driver(DRIVER_ANY);
+ igt_assert_fd(sysfs->fds.dev);
+
+ igt_assert(device_sysfs_path(sysfs->fds.dev, dev_path));
+ addr_pos = strrchr(dev_path, '/');
+ snprintf(sysfs->dev_bus_addr, sizeof(sysfs->dev_bus_addr),
+ "%s", (addr_pos ? addr_pos + 1 : ""));
+ igt_assert(sysfs->dev_bus_addr[0]);
+
+ sysfs->fds.dev_dir = open_device_sysfs_dir(sysfs->fds.dev);
+ igt_assert_fd(sysfs->fds.dev_dir);
+
+ sysfs->fds.drv_dir = open_driver_sysfs_dir(sysfs->fds.dev);
+ igt_assert_fd(sysfs->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 open_if_closed(struct sysfs_fds *sysfs)
+{
+ if (sysfs->fds.dev == -1) {
+ /* refresh device list */
+ igt_devices_scan(true);
+ igt_debug("reopen the device\n");
+ sysfs->fds.dev = __drm_open_driver(DRIVER_ANY);
+ }
+ igt_assert_fd(sysfs->fds.dev);
+}
+
+static void cleanup_sysfs_fds(struct sysfs_fds *sysfs)
+{
+ close_if_opened(&sysfs->fds.dev);
+ close_if_opened(&sysfs->fds.dev_dir);
+ close_if_opened(&sysfs->fds.drv_dir);
+ sysfs->dev_bus_addr[0] = '\0';
+}
+
+
+/**
+ * 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 sysfs_fds *sysfs)
+{
+ igt_debug("unbind the driver from the device\n");
+ igt_assert(igt_sysfs_set(sysfs->fds.drv_dir, "unbind",
+ sysfs->dev_bus_addr));
+}
+
+/* Re-bind the driver to the device */
+static void driver_bind(struct sysfs_fds *sysfs)
+{
+ igt_debug("rebind the driver to the device\n");
+ igt_abort_on_f(!igt_sysfs_set(sysfs->fds.drv_dir, "bind",
+ sysfs->dev_bus_addr), "driver rebind failed");
+}
+
+/* Initiate device reset */
+static void initiate_device_reset(struct sysfs_fds *sysfs)
+{
+ igt_debug("reset device\n");
+ igt_assert(igt_sysfs_set(sysfs->fds.dev_dir, "reset", "1"));
+}
+
+/**
+ * healthcheck:
+ * @sysfs: structure with device descriptor, if descriptor equals -1
+ * the device is reopened
+ */
+static void healthcheck(struct sysfs_fds *sysfs)
+{
+ open_if_closed(sysfs);
+ gem_test_engine(sysfs->fds.dev, ALL_ENGINES);
+}
+
+/**
+ * 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)
+{
+ char filter[strlen("sys:") + strlen(dev_path) + 1];
+
+ 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_rebind(struct sysfs_fds *sysfs)
+{
+ igt_debug("close the device\n");
+ close_if_opened(&sysfs->fds.dev);
+
+ driver_unbind(sysfs);
+
+ driver_bind(sysfs);
+}
+
+static void unbind_reset_rebind(struct sysfs_fds *sysfs)
+{
+ igt_debug("close the device\n");
+ close_if_opened(&sysfs->fds.dev);
+
+ driver_unbind(sysfs);
+
+ initiate_device_reset(sysfs);
+
+ driver_bind(sysfs);
+}
+
+igt_main
+{
+ struct sysfs_fds sysfs;
+
+ igt_fixture {
+ char dev_path[PATH_MAX];
+
+ igt_debug("opening device\n");
+ init_sysfs_fds(&sysfs);
+
+ /* Make sure subtests always reopen the same device */
+ igt_assert(device_sysfs_path(sysfs.fds.dev, dev_path));
+ set_device_filter(dev_path);
+
+ igt_skip_on(!is_sysfs_reset_supported(sysfs.fds.dev));
+
+ igt_set_timeout(60, "device reset tests timed out after 60s");
+ }
+
+ igt_describe("Tests driver unbind from/rebind to device sequence");
+ igt_subtest("unbind-rebind")
+ unbind_rebind(&sysfs);
+
+ igt_describe("Unbinds driver from device, initiates reset"
+ " then rebinds driver to device");
+ igt_subtest("unbind-reset-rebind")
+ unbind_reset_rebind(&sysfs);
+
+ igt_describe("Resets device with bound driver");
+ igt_subtest("reset-bound")
+ initiate_device_reset(&sysfs);
+
+ igt_describe("Subtests with additional healthchecks");
+ igt_subtest_group {
+ igt_fixture {
+ open_if_closed(&sysfs);
+ igt_require_intel(sysfs.fds.dev);
+ }
+
+ igt_subtest("healthcheck")
+ healthcheck(&sysfs);
+
+ igt_subtest("unbind-reset-rebind-healthcheck") {
+ unbind_reset_rebind(&sysfs);
+ healthcheck(&sysfs);
+ }
+
+ igt_subtest("reset-bound-healthcheck") {
+ initiate_device_reset(&sysfs);
+ healthcheck(&sysfs);
+ }
+ }
+
+ igt_fixture {
+ igt_reset_timeout();
+ cleanup_sysfs_fds(&sysfs);
+ }
+}
diff --git a/tests/meson.build b/tests/meson.build
index 28091794f..b0acdf7c0 100644
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -8,6 +8,7 @@ test_progs = [
'core_setmaster_vs_auth',
'debugfs_test',
'dmabuf',
+ 'device_reset',
'drm_import_export',
'drm_mm',
'drm_read',
--
2.25.1
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