[Intel-gfx] [PATCH i-g-t 1/4 v7] lib/igt_kmod: New library to support driver loading/unloading and additional helpers.
Marius Vlad
marius.c.vlad at intel.com
Thu Dec 1 12:23:55 UTC 2016
lib/igt_aux: Added igt_pkill and igt_lsof helper.
lib/igt_kmod: Added load/unload kmod helpers.
v7:
- document the case where leaving stray fd from drm_open_driver()
might fail reloading the driver.
- list also current opened files from /dev/dri in case we could not
unload the driver.
- convert igt_info to igt_warn (Chris Wilson)
- added KMOD_|PROCPS CFLAGS (Chris Wilson)
v6:
- include latest modifications from tests/drv_module_reload:
display all loaded modules and list information about opened
files by processes (Petri Latvala)
v5:
- added igt_i915_driver_{load/unload}.
- added kick_snd_hda_intel() to match current
tests/drv_module_reload_basic and integrated into
igt_i915_driver_load/unload.
- added gtk-doc section for lib/igt_kmod
v4:
- decided to split libkmod helpers into their own file as there's
another user lib/igt_gvt or tests/gvt_basic.
- fixed some gtk-doc documentation.
v3:
- return -errno (igt_pkill()) in case of failure (Cris Wilson)
- return bool for igt_kmod_is_loaded(), replaced strncasecmp with strncmp
(Chris Wilson)
- use igt_debug() instead of igt_info() for igt_kmod_load()/
igt_kmod_unload() and return -err directly from libkmod (Chris Wilson)
v2:
- Renamed libkmod helpers (Chris Wilson)
- Removed SIGTERM/SIGKILL case where we repeatedly tried to terminate the
process: just call kill(2) once (Chris Wilson)
- Removed redundant check in igt_kmod_unload(), igt_module_in_use() (Chris
Wilson)
- Pass flags to igt_kmod_unload() from the caller (Chris Wilson)
- Removed useless function igt_kill() which acts just as kill(2) (Chris
Wilson)
Signed-off-by: Marius Vlad <marius.c.vlad at intel.com>
---
configure.ac | 2 +
.../intel-gpu-tools/intel-gpu-tools-docs.xml | 1 +
lib/Makefile.am | 5 +-
lib/Makefile.sources | 2 +
lib/igt_aux.c | 260 ++++++++++++++++
lib/igt_aux.h | 3 +
lib/igt_gvt.c | 43 +--
lib/igt_kmod.c | 328 +++++++++++++++++++++
lib/igt_kmod.h | 39 +++
lib/igt_sysfs.c | 106 +++++++
lib/igt_sysfs.h | 3 +
11 files changed, 750 insertions(+), 42 deletions(-)
create mode 100644 lib/igt_kmod.c
create mode 100644 lib/igt_kmod.h
diff --git a/configure.ac b/configure.ac
index e181c83..cba312f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -121,6 +121,8 @@ AC_SUBST(ASSEMBLER_WARN_CFLAGS)
PKG_CHECK_MODULES(DRM, [libdrm])
PKG_CHECK_MODULES(PCIACCESS, [pciaccess >= 0.10])
+PKG_CHECK_MODULES(KMOD, [libkmod])
+PKG_CHECK_MODULES(PROCPS, [libprocps])
case "$target_cpu" in
x86*|i?86)
diff --git a/docs/reference/intel-gpu-tools/intel-gpu-tools-docs.xml b/docs/reference/intel-gpu-tools/intel-gpu-tools-docs.xml
index c862f2a..39061a8 100644
--- a/docs/reference/intel-gpu-tools/intel-gpu-tools-docs.xml
+++ b/docs/reference/intel-gpu-tools/intel-gpu-tools-docs.xml
@@ -22,6 +22,7 @@
<xi:include href="xml/igt_sysfs.xml"/>
<xi:include href="xml/igt_draw.xml"/>
<xi:include href="xml/igt_kms.xml"/>
+ <xi:include href="xml/igt_kmod.xml"/>
<xi:include href="xml/igt_fb.xml"/>
<xi:include href="xml/igt_aux.xml"/>
<xi:include href="xml/igt_gt.xml"/>
diff --git a/lib/Makefile.am b/lib/Makefile.am
index 4c0893d..5eec207 100644
--- a/lib/Makefile.am
+++ b/lib/Makefile.am
@@ -23,7 +23,8 @@ if !HAVE_LIBDRM_INTEL
endif
AM_CPPFLAGS = -I$(top_srcdir)
-AM_CFLAGS = $(CWARNFLAGS) $(DRM_CFLAGS) $(PCIACCESS_CFLAGS) $(LIBUNWIND_CFLAGS) $(DEBUG_CFLAGS) \
+AM_CFLAGS = $(CWARNFLAGS) $(DRM_CFLAGS) $(PCIACCESS_CFLAGS) $(LIBUNWIND_CFLAGS) \
+ $(DEBUG_CFLAGS) $(KMOD_CFLAGS) $(PROCPS_CFLAGS) \
-DIGT_SRCDIR=\""$(abs_top_srcdir)/tests"\" \
-DIGT_DATADIR=\""$(pkgdatadir)"\" \
-DIGT_LOG_DOMAIN=\""$(subst _,-,$*)"\" \
@@ -34,6 +35,8 @@ AM_CFLAGS += $(CAIRO_CFLAGS)
libintel_tools_la_LIBADD = \
$(DRM_LIBS) \
$(PCIACCESS_LIBS) \
+ $(PROCPS_LIBS) \
+ $(KMOD_LIBS) \
$(CAIRO_LIBS) \
$(LIBUDEV_LIBS) \
$(LIBUNWIND_LIBS) \
diff --git a/lib/Makefile.sources b/lib/Makefile.sources
index e8e277b..2205c86 100644
--- a/lib/Makefile.sources
+++ b/lib/Makefile.sources
@@ -77,6 +77,8 @@ lib_source_list = \
igt_pm.h \
uwildmat/uwildmat.h \
uwildmat/uwildmat.c \
+ igt_kmod.c \
+ igt_kmod.h \
$(NULL)
.PHONY: version.h.tmp
diff --git a/lib/igt_aux.c b/lib/igt_aux.c
index 421f6d4..a4ac44b 100644
--- a/lib/igt_aux.c
+++ b/lib/igt_aux.c
@@ -51,6 +51,8 @@
#include <termios.h>
#include <assert.h>
+#include <proc/readproc.h>
+
#include "drmtest.h"
#include "i915_drm.h"
#include "intel_chipset.h"
@@ -65,6 +67,10 @@
#include "igt_stats.h"
#include "igt_sysfs.h"
+#ifdef HAVE_LIBGEN_H
+#include <libgen.h> /* for dirname() */
+#endif
+
/**
* SECTION:igt_aux
* @short_description: Auxiliary libraries and support functions
@@ -1193,6 +1199,260 @@ void igt_set_module_param_int(const char *name, int val)
igt_set_module_param(name, str);
}
+/**
+ * igt_pkill:
+ * @sig: Signal to send
+ * @comm: Name of process in the form found in /proc/pid/comm (limited to 15
+ * chars)
+ *
+ * Returns: 0 in case the process is not found running or the signal has been
+ * sent successfully or -errno otherwise.
+ *
+ * This function sends the signal @sig for a process found in process table
+ * with name @comm.
+ */
+int
+igt_pkill(int sig, const char *comm)
+{
+ PROCTAB *proc;
+ proc_t *proc_info;
+ int err = 0;
+
+ proc = openproc(PROC_FILLCOM | PROC_FILLSTAT | PROC_FILLARG);
+ igt_assert(proc != NULL);
+
+ while ((proc_info = readproc(proc, NULL))) {
+ if (!strncasecmp(proc_info->cmd, comm, sizeof(proc_info->cmd))) {
+
+ if (kill(proc_info->tid, sig) < 0)
+ err = -errno;
+
+ freeproc(proc_info);
+ break;
+ }
+ freeproc(proc_info);
+ }
+
+ closeproc(proc);
+ return err;
+}
+
+struct pinfo {
+ pid_t pid;
+ const char *comm;
+ const char *fn;
+};
+
+static void
+__igt_show_stat(struct pinfo *info)
+{
+ const char *comm, *fn;
+ const char *type = "";
+ struct stat st;
+
+ pid_t pid = info->pid;
+ igt_assert((comm = info->comm));
+ igt_assert((fn = info->fn));
+
+ if (lstat(fn, &st) == -1)
+ return;
+
+ igt_info("%20.20s ", comm);
+ igt_info("%10d ", pid);
+
+ switch (st.st_mode & S_IFMT) {
+ case S_IFBLK:
+ type = "block";
+ break;
+ case S_IFCHR:
+ type = "character";
+ break;
+ case S_IFDIR:
+ type = "directory";
+ break;
+ case S_IFIFO:
+ type = "FIFO/pipe";
+ break;
+ case S_IFLNK:
+ type = "symlink";
+ break;
+ case S_IFREG:
+ type = "file";
+ break;
+ case S_IFSOCK:
+ type = "socket";
+ break;
+ default:
+ type = "unknown?";
+ break;
+ }
+ igt_info("%20.20s ", type);
+
+ igt_info("%10ld%10ld ", (long) st.st_uid, (long) st.st_gid);
+
+ igt_info("%15lld bytes ", (long long) st.st_size);
+ igt_info("%30.30s", fn);
+ igt_info("\n");
+
+}
+
+
+static void
+igt_show_stat_header(void)
+{
+ igt_info("%20.20s%11.11s%21.21s%11.11s%10.10s%22.22s%31.31s\n",
+ "COMM", "PID", "Type", "UID", "GID", "Size", "Filename");
+
+}
+
+static void
+igt_show_stat(proc_t *info, int *state, const char *fn)
+{
+ if (!*state)
+ igt_show_stat_header();
+
+ __igt_show_stat(&(struct pinfo) {.pid = info->tid,
+ .comm = info->cmd, .fn = fn });
+ (*state)++;
+}
+
+static void
+__igt_lsof_fds(proc_t *proc_info, int *state, char *proc_path, const char *dir)
+{
+ struct dirent *d;
+ struct stat st;
+ char path[PATH_MAX];
+ char *fd_lnk;
+
+ /* default fds or kernel threads */
+ const char *default_fds[] = { "/dev/pts", "/dev/null" };
+
+ DIR *dp = opendir(proc_path);
+ igt_assert(dp);
+again:
+ while ((d = readdir(dp))) {
+ char *copy_fd_lnk;
+ char *dirn;
+
+ unsigned int i;
+ ssize_t read;
+
+ if (*d->d_name == '.')
+ continue;
+
+ memset(path, 0, sizeof(path));
+ snprintf(path, sizeof(path), "%s/%s", proc_path, d->d_name);
+
+ if (lstat(path, &st) == -1)
+ continue;
+
+ fd_lnk = malloc(st.st_size + 1);
+
+ igt_assert((read = readlink(path, fd_lnk, st.st_size + 1)));
+ fd_lnk[read] = '\0';
+
+ for (i = 0; i < ARRAY_SIZE(default_fds); ++i) {
+ if (!strncmp(default_fds[i],
+ fd_lnk,
+ strlen(default_fds[i]))) {
+ free(fd_lnk);
+ goto again;
+ }
+ }
+
+ copy_fd_lnk = strdup(fd_lnk);
+ dirn = dirname(copy_fd_lnk);
+
+ if (!strncmp(dir, dirn, strlen(dir)))
+ igt_show_stat(proc_info, state, fd_lnk);
+
+ free(copy_fd_lnk);
+ free(fd_lnk);
+ }
+}
+
+
+/*
+ * This functions verifies, for each process running on the machine, if the
+ * current working directory or the fds matches the one supplied in dir.
+ */
+static void
+__igt_lsof(const char *dir)
+{
+ PROCTAB *proc;
+ proc_t *proc_info;
+
+ char path[PATH_MAX];
+ char *name_lnk;
+ struct stat st;
+ int state = 0;
+
+ proc = openproc(PROC_FILLCOM | PROC_FILLSTAT | PROC_FILLARG);
+ igt_assert(proc != NULL);
+
+ while ((proc_info = readproc(proc, NULL))) {
+ ssize_t read;
+
+ /* check current working directory */
+ memset(path, 0, sizeof(path));
+ snprintf(path, sizeof(path), "/proc/%d/cwd", proc_info->tid);
+
+ if (stat(path, &st) == -1)
+ continue;
+
+ name_lnk = malloc(st.st_size + 1);
+
+ igt_assert((read = readlink(path, name_lnk, st.st_size + 1)));
+ name_lnk[read] = '\0';
+
+ if (!strncmp(dir, name_lnk, strlen(dir)))
+ igt_show_stat(proc_info, &state, name_lnk);
+
+ /* check also fd, seems that lsof(8) doesn't look here */
+ memset(path, 0, sizeof(path));
+ snprintf(path, sizeof(path), "/proc/%d/fd", proc_info->tid);
+
+ __igt_lsof_fds(proc_info, &state, path, dir);
+
+ free(name_lnk);
+ freeproc(proc_info);
+ }
+
+ closeproc(proc);
+}
+
+/**
+ * igt_lsof: Lists information about files opened by processes.
+ * @dpath: Path to look under. A valid directory is required.
+ *
+ * This function mimics (a restrictive form of) lsof(8), but also shows
+ * information about opened fds.
+ */
+void
+igt_lsof(const char *dpath)
+{
+ struct stat st;
+ size_t len = strlen(dpath);
+ char *sanitized;
+
+ if (stat(dpath, &st) == -1)
+ return;
+
+ if (!S_ISDIR(st.st_mode)) {
+ igt_info("%s not a directory!\n", dpath);
+ return;
+ }
+
+ sanitized = strdup(dpath);
+ /* remove last '/' so matching is easier */
+ if (len > 1 && dpath[len - 1] == '/')
+ sanitized[len - 1] = '\0';
+
+ __igt_lsof(sanitized);
+
+ free(sanitized);
+}
+
static struct igt_siglatency {
timer_t timer;
struct timespec target;
diff --git a/lib/igt_aux.h b/lib/igt_aux.h
index d30196b..4162527 100644
--- a/lib/igt_aux.h
+++ b/lib/igt_aux.h
@@ -264,4 +264,7 @@ double igt_stop_siglatency(struct igt_mean *result);
void igt_set_module_param(const char *name, const char *val);
void igt_set_module_param_int(const char *name, int val);
+int igt_pkill(int sig, const char *comm);
+void igt_lsof(const char *dpath);
+
#endif /* IGT_AUX_H */
diff --git a/lib/igt_gvt.c b/lib/igt_gvt.c
index 0f332d1..8bbf9bd 100644
--- a/lib/igt_gvt.c
+++ b/lib/igt_gvt.c
@@ -23,6 +23,7 @@
#include "igt.h"
#include "igt_gvt.h"
+#include "igt_sysfs.h"
#include <dirent.h>
#include <unistd.h>
@@ -46,49 +47,9 @@ static bool is_gvt_enabled(void)
return enabled;
}
-static void unbind_fbcon(void)
-{
- char buf[128];
- const char *path = "/sys/class/vtconsole";
- DIR *dir;
- struct dirent *vtcon;
-
- dir = opendir(path);
- if (!dir)
- return;
-
- while ((vtcon = readdir(dir))) {
- int fd, len;
-
- if (strncmp(vtcon->d_name, "vtcon", 5))
- continue;
-
- sprintf(buf, "%s/%s/name", path, vtcon->d_name);
- fd = open(buf, O_RDONLY);
- if (fd < 0)
- continue;
-
- len = read(fd, buf, sizeof(buf) - 1);
- close(fd);
- if (len >= 0)
- buf[len] = '\0';
-
- if (strstr(buf, "frame buffer device")) {
- sprintf(buf, "%s/%s/bind", path, vtcon->d_name);
- fd = open(buf, O_WRONLY);
- if (fd != -1) {
- igt_ignore_warn(write(fd, "1\n", 2));
- close(fd);
- }
- break;
- }
- }
- closedir(dir);
-}
-
static void unload_i915(void)
{
- unbind_fbcon();
+ kick_fbcon(false);
/* pkill alsact */
igt_ignore_warn(system("/sbin/modprobe -s -r i915"));
diff --git a/lib/igt_kmod.c b/lib/igt_kmod.c
new file mode 100644
index 0000000..afa1a11
--- /dev/null
+++ b/lib/igt_kmod.c
@@ -0,0 +1,328 @@
+/*
+ * Copyright © 2016 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include "igt.h"
+#include "igt_core.h"
+#include "igt_sysfs.h"
+#include "igt_kmod.h"
+
+#include <signal.h>
+
+/**
+ * SECTION:igt_kmod
+ * @short_description: Wrappers around libkmod for module loading/unloading
+ * @title: kmod
+ * @include: igt.h
+ *
+ * This library provides helpers to load/unload module driver.
+ *
+ * Note on loading/reloading:
+ *
+ * Loading/unload/reloading the driver requires that resources to /dev/dri to
+ * be released (closed). A potential mistake would be to submit commands to the
+ * GPU by having a fd returned by @drm_open_driver, which is closed by atexit
+ * signal handler so reloading/unloading the driver will fail if performed
+ * afterwards. One possible solution to this issue is to use
+ * @__drm_open_driver() or use @igt_set_module_param() to set module parameters
+ * dynamically.
+ */
+
+
+/**
+ * igt_kmod_is_loaded:
+ * @mod_name: The name of the module.
+ *
+ * Returns: True in case the module has been found or false otherwise.
+ *
+ * Function to check the existance of module @mod_name in list of loaded kernel
+ * modules.
+ *
+ */
+bool
+igt_kmod_is_loaded(const char *mod_name)
+{
+ struct kmod_list *mod, *list;
+ struct kmod_ctx *ctx;
+ bool ret = false;
+
+ ctx = kmod_new(NULL, NULL);
+ igt_assert(ctx != NULL);
+
+ if (kmod_module_new_from_loaded(ctx, &list) < 0) {
+ goto out;
+ }
+
+ kmod_list_foreach(mod, list) {
+ struct kmod_module *kmod = kmod_module_get_module(mod);
+ const char *kmod_name = kmod_module_get_name(kmod);
+
+ if (!strncmp(kmod_name, mod_name, strlen(kmod_name))) {
+ kmod_module_unref(kmod);
+ ret = true;
+ break;
+ }
+ kmod_module_unref(kmod);
+ }
+ kmod_module_unref_list(list);
+out:
+ kmod_unref(ctx);
+
+ return ret;
+}
+
+/**
+ * igt_kmod_load:
+ * @mod_name: The name of the module
+ * @opts: Parameters for the module. NULL in case no parameters
+ * are to be passed, or a '\0' terminated string otherwise.
+ *
+ * Returns: 0 in case of success or -errno in case the module could not
+ * be loaded.
+ *
+ * This function loads a kernel module using the name specified in @mod_name.
+ *
+ * @Note: This functions doesn't automatically resolve other module
+ * dependencies so make make sure you load the dependencies module(s) before
+ * this one.
+ */
+int
+igt_kmod_load(const char *mod_name, const char *opts)
+{
+ struct kmod_ctx *ctx;
+ struct kmod_module *kmod;
+ int err = 0;
+
+ ctx = kmod_new(NULL, NULL);
+ igt_assert(ctx != NULL);
+
+ err = kmod_module_new_from_name(ctx, mod_name, &kmod);
+ if (err < 0) {
+ goto out;
+ }
+
+ err = kmod_module_insert_module(kmod, 0, opts);
+ if (err < 0) {
+ switch (err) {
+ case -EEXIST:
+ igt_debug("Module %s already inserted\n",
+ kmod_module_get_name(kmod));
+ break;
+ case -ENOENT:
+ igt_debug("Unknown symbol in module %s or "
+ "unknown parameter\n",
+ kmod_module_get_name(kmod));
+ break;
+ default:
+ igt_debug("Could not insert %s (%s)\n",
+ kmod_module_get_name(kmod), strerror(-err));
+ break;
+ }
+ }
+out:
+ kmod_module_unref(kmod);
+ kmod_unref(ctx);
+
+ return -err ? err < 0 : err;
+}
+
+
+/**
+ * igt_kmod_unload:
+ * @mod_name: Module name.
+ * @flags: flags are passed directly to libkmod and can be:
+ * KMOD_REMOVE_FORCE or KMOD_REMOVE_NOWAIT.
+ *
+ * Returns: 0 in case of success or -errno otherwise.
+ *
+ * Removes the module @mod_name.
+ *
+ */
+int
+igt_kmod_unload(const char *mod_name, unsigned int flags)
+{
+ struct kmod_ctx *ctx;
+ struct kmod_module *kmod;
+ int err = 0;
+
+ ctx = kmod_new(NULL, NULL);
+ igt_assert(ctx != NULL);
+
+ err = kmod_module_new_from_name(ctx, mod_name, &kmod);
+ if (err < 0) {
+ igt_debug("Could not use module %s (%s)\n", mod_name,
+ strerror(-err));
+ goto out;
+ }
+
+ err = kmod_module_remove_module(kmod, flags);
+ if (err < 0) {
+ igt_debug("Could not remove module %s (%s)\n", mod_name,
+ strerror(-err));
+ }
+
+out:
+ kmod_module_unref(kmod);
+ kmod_unref(ctx);
+
+ return -err ? err < 0 : err;
+}
+
+/**
+ *
+ * igt_kmod_list_loaded: List all modules currently loaded.
+ *
+ */
+void
+igt_kmod_list_loaded(void)
+{
+ struct kmod_list *module, *list;
+ struct kmod_ctx *ctx;
+
+ ctx = kmod_new(NULL, NULL);
+ igt_assert(ctx != NULL);
+
+ if (kmod_module_new_from_loaded(ctx, &list) < 0) {
+ kmod_unref(ctx);
+ return;
+ }
+
+ igt_info("Module\t\t Used by\n");
+
+ kmod_list_foreach(module, list) {
+ struct kmod_module *kmod = kmod_module_get_module(module);
+ struct kmod_list *module_deps, *module_deps_list;
+
+ igt_info("%-24s", kmod_module_get_name(kmod));
+ module_deps_list = kmod_module_get_holders(kmod);
+ if (module_deps_list) {
+
+ kmod_list_foreach(module_deps, module_deps_list) {
+ struct kmod_module *kmod_dep;
+
+ kmod_dep = kmod_module_get_module(module_deps);
+ igt_info("%s",
+ kmod_module_get_name(kmod_dep));
+
+ if (kmod_list_next(module_deps_list, module_deps))
+ igt_info(",");
+
+ kmod_module_unref(kmod_dep);
+ }
+ }
+ kmod_module_unref_list(module_deps_list);
+
+ igt_info("\n");
+ kmod_module_unref(kmod);
+ }
+
+ kmod_module_unref_list(list);
+ kmod_unref(ctx);
+}
+
+/**
+ * igt_i915_driver_load:
+ * @opts: options to pass to i915 driver
+ *
+ * Loads the i915 driver and its dependencies.
+ *
+ */
+int
+igt_i915_driver_load(const char *opts)
+{
+ if (opts)
+ igt_info("Reloading i915 with %s\n\n", opts);
+
+ /* we do not have automatic loading of dependencies */
+ igt_kmod_load("drm", NULL);
+ igt_kmod_load("drm_kms_helper", NULL);
+
+ if (igt_kmod_load("i915", opts)) {
+ igt_warn("Could not load i915\n");
+ return IGT_EXIT_FAILURE;
+ }
+
+ kick_fbcon(true);
+ igt_kmod_load("snd_hda_intel", NULL);
+
+ return IGT_EXIT_SUCCESS;
+}
+
+/**
+ * igt_i915_driver_unload:
+ *
+ * Unloads the i915 driver and its dependencies.
+ *
+ */
+int
+igt_i915_driver_unload(void)
+{
+ /* unbind vt */
+ kick_fbcon(false);
+
+ if (igt_kmod_is_loaded("snd_hda_intel")) {
+ igt_pkill(SIGTERM, "alsactl");
+
+ /* unbind snd_hda_intel */
+ kick_snd_hda_intel();
+
+ if (igt_kmod_unload("snd_hda_intel", 0)) {
+ igt_warn("Could not unload snd_hda_intel\n");
+ igt_kmod_list_loaded();
+ igt_lsof("/dev/snd");
+ return IGT_EXIT_FAILURE;
+ }
+ }
+
+ /* gen5 */
+ if (igt_kmod_is_loaded("intel_ips")) {
+ igt_kmod_unload("intel_ips", 0);
+ }
+
+ if (igt_kmod_is_loaded("i915")) {
+ if (igt_kmod_unload("i915", 0)) {
+ igt_warn("Could not unload i915\n");
+ igt_kmod_list_loaded();
+ igt_lsof("/dev/dri");
+ return IGT_EXIT_SKIP;
+ } else {
+ igt_info("i915.ko has been unloaded!\n");
+ }
+ }
+
+ if (igt_kmod_is_loaded("intel-gtt")) {
+ igt_kmod_unload("intel-gtt", 0);
+ }
+
+ igt_kmod_unload("drm_kms_helper", 0);
+ igt_kmod_unload("drm", 0);
+
+ if (igt_kmod_is_loaded("i915")) {
+ igt_warn("i915.ko still loaded!\n");
+ return IGT_EXIT_FAILURE;
+ } else {
+ igt_info("module successfully unloaded\n");
+ }
+
+
+ return IGT_EXIT_SUCCESS;
+}
diff --git a/lib/igt_kmod.h b/lib/igt_kmod.h
new file mode 100644
index 0000000..dcf8f67
--- /dev/null
+++ b/lib/igt_kmod.h
@@ -0,0 +1,39 @@
+/*
+ * Copyright © 2016 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#ifndef IGT_KMOD_H
+#define IGT_KMOD_H
+
+#include <libkmod.h>
+
+bool igt_kmod_is_loaded(const char *mod_name);
+void igt_kmod_list_loaded(void);
+
+int igt_kmod_load(const char *mod_name, const char *opts);
+int igt_kmod_unload(const char *mod_name, unsigned int flags);
+
+int igt_i915_driver_load(const char *opts);
+int igt_i915_driver_unload(void);
+
+
+#endif /* IGT_KMOD_H */
diff --git a/lib/igt_sysfs.c b/lib/igt_sysfs.c
index c19821d..570329d 100644
--- a/lib/igt_sysfs.c
+++ b/lib/igt_sysfs.c
@@ -34,7 +34,11 @@
#include <fcntl.h>
#include <unistd.h>
#include <i915_drm.h>
+#include <dirent.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include "igt_core.h"
#include "igt_sysfs.h"
/**
@@ -392,3 +396,105 @@ bool igt_sysfs_set_boolean(int dir, const char *attr, bool value)
{
return igt_sysfs_printf(dir, attr, "%d", value) == 1;
}
+
+/**
+ * kick_fbcon:
+ * @enable: boolean value
+ *
+ * This functions enables/disables the text console running on top of the
+ * framebuffer device.
+ */
+void kick_fbcon(bool enable)
+{
+ char buf[128];
+ const char *path = "/sys/class/vtconsole";
+ DIR *dir;
+ struct dirent *vtcon;
+
+ dir = opendir(path);
+ if (!dir)
+ return;
+
+ while ((vtcon = readdir(dir))) {
+ int fd, len;
+
+ if (strncmp(vtcon->d_name, "vtcon", 5))
+ continue;
+
+ sprintf(buf, "%s/%s/name", path, vtcon->d_name);
+ fd = open(buf, O_RDONLY);
+ if (fd < 0)
+ continue;
+
+ len = read(fd, buf, sizeof(buf) - 1);
+ close(fd);
+ if (len >= 0)
+ buf[len] = '\0';
+
+ if (strstr(buf, "frame buffer device")) {
+ sprintf(buf, "%s/%s/bind", path, vtcon->d_name);
+ fd = open(buf, O_WRONLY);
+ if (fd != -1) {
+ if (enable)
+ igt_ignore_warn(write(fd, "1\n", 2));
+ else
+ igt_ignore_warn(write(fd, "0\n", 2));
+ close(fd);
+ }
+ break;
+ }
+ }
+ closedir(dir);
+}
+
+/**
+ * kick_snd_hda_intel:
+ *
+ * This functions unbinds the snd_hda_intel driver so the module cand be
+ * unloaded.
+ *
+ */
+void kick_snd_hda_intel(void)
+{
+ DIR *dir;
+ struct dirent *snd_hda;
+ int fd; size_t len;
+
+ const char *dpath = "/sys/bus/pci/drivers/snd_hda_intel";
+ const char *path = "/sys/bus/pci/drivers/snd_hda_intel/unbind";
+ const char *devid = "0000:";
+
+ fd = open(path, O_WRONLY);
+ if (fd < 0) {
+ return;
+ }
+
+ dir = opendir(dpath);
+ if (!dir)
+ goto out;
+
+ len = strlen(devid);
+ while ((snd_hda = readdir(dir))) {
+ struct stat st;
+ char fpath[PATH_MAX];
+
+ if (*snd_hda->d_name == '.')
+ continue;
+
+ snprintf(fpath, sizeof(fpath), "%s/%s", dpath, snd_hda->d_name);
+ if (lstat(fpath, &st))
+ continue;
+
+ if (!S_ISLNK(st.st_mode))
+ continue;
+
+ if (!strncmp(devid, snd_hda->d_name, len)) {
+ igt_ignore_warn(write(fd, snd_hda->d_name,
+ strlen(snd_hda->d_name)));
+ }
+ }
+
+ closedir(dir);
+out:
+ close(fd);
+}
diff --git a/lib/igt_sysfs.h b/lib/igt_sysfs.h
index 4820066..69b2e5e 100644
--- a/lib/igt_sysfs.h
+++ b/lib/igt_sysfs.h
@@ -43,4 +43,7 @@ bool igt_sysfs_set_u32(int dir, const char *attr, uint32_t value);
bool igt_sysfs_get_boolean(int dir, const char *attr);
bool igt_sysfs_set_boolean(int dir, const char *attr, bool value);
+void kick_fbcon(bool enable);
+void kick_snd_hda_intel(void);
+
#endif /* __IGT_SYSFS_H__ */
--
2.7.4
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