From: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx>
We recently fixed a bug where it was impossible to do I2C transactions
on eDP panels when they were disabled. Now it should be possible to do
these transactions when the panel is disabled, but there's a race
condition that triggers dmesg errors if we try do do the I2C
transactions and set a mode on the panel at the same time. This
program should reproduce this bug and check dmesg for errors.
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx>
---
tests/.gitignore | 1 +
tests/Makefile.am | 2 +
tests/kms_edp_vdd_race.c | 226 +++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 229 insertions(+)
create mode 100644 tests/kms_edp_vdd_race.c
diff --git a/tests/.gitignore b/tests/.gitignore
index 09ea074..ddb61f9 100644
--- a/tests/.gitignore
+++ b/tests/.gitignore
@@ -102,6 +102,7 @@ igt_no_exit_list_only
igt_no_subtest
kms_addfb
kms_cursor_crc
+kms_edp_vdd_race
kms_flip
kms_pipe_crc_basic
kms_render
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 0426ec0..955d2a3 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -52,6 +52,7 @@ TESTS_progs_M = \
gem_write_read_ring_switch \
kms_addfb \
kms_cursor_crc \
+ kms_edp_vdd_race \
kms_flip \
kms_pipe_crc_basic \
kms_render \
@@ -236,6 +237,7 @@ gem_fence_thrash_LDADD = $(LDADD) -lpthread
gem_flink_race_LDADD = $(LDADD) -lpthread
gem_threaded_access_tiled_LDADD = $(LDADD) -lpthread
prime_self_import_LDADD = $(LDADD) -lpthread
+kms_edp_vdd_race_LDADD = $(LDADD) -lpthread
gem_wait_render_timeout_LDADD = $(LDADD) -lrt
kms_flip_LDADD = $(LDADD) -lrt
diff --git a/tests/kms_edp_vdd_race.c b/tests/kms_edp_vdd_race.c
new file mode 100644
index 0000000..a6bff65
--- /dev/null
+++ b/tests/kms_edp_vdd_race.c
@@ -0,0 +1,226 @@
+/*
+ * Copyright © 2013 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.
+ *
+ * Authors: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx>
+ *
+ */
+
+#include <dirent.h>
+#include <fcntl.h>
+#include <linux/i2c.h>
+#include <linux/i2c-dev.h>
+#include <pthread.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#include "drmtest.h"
+
+int drm_fd, kmsg_fd;
+drmModeResPtr res;
+drmModeConnectorPtr edp_connector;
+bool stop;
+
+static void disable_all_screens(void)
+{
+ int i, rc;
+
+ for (i = 0; i < res->count_crtcs; i++) {
+ rc = drmModeSetCrtc(drm_fd, res->crtcs[i], -1, 0, 0,
+ NULL, 0, NULL);
+ igt_assert(rc == 0);
+ }
+}
+
+static void find_edp_connector(void)
+{
+ int i;
+ drmModeConnectorPtr c;
+
+ edp_connector = NULL;
+ for (i = 0; i < res->count_connectors; i++) {
+ c = drmModeGetConnector(drm_fd, res->connectors[i]);
+
+ if (c->connector_type == DRM_MODE_CONNECTOR_eDP) {
+ igt_require(c->connection == DRM_MODE_CONNECTED);
+ edp_connector = c;
+ break;
+ }
+
+ drmModeFreeConnector(c);
+ }
+ igt_require(edp_connector);
+}
+
+static void read_edid_ioctl(int fd)
+{
+ unsigned char edid[128] = {};
+ struct i2c_msg msgs[] = {
+ { /* Start at 0. */
+ .addr = 0x50,
+ .flags = 0,
+ .len = 1,
+ .buf = edid,
+ }, { /* Now read the EDID. */
+ .addr = 0x50,
+ .flags = I2C_M_RD,
+ .len = 128,
+ .buf = edid,
+ }
+ };
+ struct i2c_rdwr_ioctl_data msgset = {
+ .msgs = msgs,
+ .nmsgs = 2,
+ };
+
+ ioctl(fd, I2C_RDWR, &msgset);
+}
+
+/* TODO: We're currently just trying to read all the I2C files. We should try to
+ * find which one is really the eDP I2C file and just read from it. */
+static void read_i2c_edid(void)
+{
+ int fd;
+ DIR *dir;
+
+ struct dirent *dirent;
+ char full_name[32];
+
+ dir = opendir("/dev/");
+ igt_assert(dir);
+
+ while ((dirent = readdir(dir))) {
+ if (strncmp(dirent->d_name, "i2c-", 4) == 0) {
+ snprintf(full_name, 32, "/dev/%s", dirent->d_name);
+ fd = open(full_name, O_RDWR);
+ igt_assert(fd != -1);
+ read_edid_ioctl(fd);
+ close(fd);
+ }
+ }
+
+ closedir(dir);
+}
+
+static void *i2c_thread_func(void *unused)
+{
+ while (!stop)
+ read_i2c_edid();
+
+ pthread_exit(NULL);
+}
+
+static uint32_t create_fb(int width, int height)
+{
+ struct kmstest_fb fb;
+ cairo_t *cr;
+ uint32_t buffer_id;
+
+ buffer_id = kmstest_create_fb(drm_fd, width, height, 32, 24, false,
+ &fb);
+ cr = kmstest_get_cairo_ctx(drm_fd, &fb);
+ kmstest_paint_test_pattern(cr, width, height);
+ return buffer_id;
+}
+
+static void enable_edp_screen(void)
+{
+ int rc;
+ uint32_t buffer_id = 0, crtc_id, connector_id;
+ drmModeModeInfoPtr mode;
+
+ crtc_id = res->crtcs[0];
+ connector_id = edp_connector->connector_id;
+ mode = &edp_connector->modes[0];
+
+ buffer_id = create_fb(mode->hdisplay, mode->vdisplay);
+
+ rc = drmModeSetCrtc(drm_fd, crtc_id, buffer_id, 0, 0, &connector_id,
+ 1, mode);
+ igt_assert(rc == 0);
+}
+
+static void *modeset_thread_func(void *unused)
+{
+ while (!stop) {
+ disable_all_screens();
+ sleep(1);
+ enable_edp_screen();
+ sleep(1);
+ }
+
+ pthread_exit(NULL);
+}
+
+/* This test exercises a race condition that happens when we're trying to read
+ * the I2C data from an eDP panel at the same time we're trying to set a mode on
+ * the same panel. If we have the bug, we print error messages on dmesg, which
+ * we should catch with the kmsg functions. */
+static void i2c_modeset_vdd_race(void)
+{
+ pthread_t i2c_thread, modeset_thread;
+ void *status;
+
+ kmsg_error_reset(kmsg_fd);
+
+ stop = false;
+ pthread_create(&i2c_thread, NULL, i2c_thread_func, NULL);
+ pthread_create(&modeset_thread, NULL, modeset_thread_func, NULL);
+
+ /* This effectively sleeps for 100 seconds, but kills the program in
+ * case there's error on dmesg. */
+ kmsg_error_detect(kmsg_fd, 100 * 1000, "");
+
+ stop = true;
+ pthread_join(i2c_thread, &status);
+ pthread_join(modeset_thread, &status);
+
+ /* Make sure we check everything after the threads have actually
+ * stopped. */
+ kmsg_error_detect(kmsg_fd, 1 * 1000, "");
+}
+
+igt_main
+{
+ igt_fixture {
+ drm_fd = drm_open_any();
+ igt_require(drm_fd >= 0);
+
+ res = drmModeGetResources(drm_fd);
+ igt_assert(res);
+
+ kmsg_fd = kmsg_error_setup();
+
+ find_edp_connector();
+ }
+
+ igt_subtest("i2c-modeset-vdd-race")
+ i2c_modeset_vdd_race();
+
+ igt_fixture {
+ kmsg_error_teardown(kmsg_fd);
+ drmModeFreeConnector(edp_connector);
+ drmModeFreeResources(res);
+ close(drm_fd);
+ }
+}
--
1.8.3.1
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