Re: [PATCH i-g-t v4 2/5] tests/pm_dc: Added new test to verify Display C States

[Anshuman Gupta <anshuman.gupta@intel.com>]

On Fri, Feb 08, 2019 at 04:49:31PM +0200, Imre Deak wrote:
> On Fri, Feb 01, 2019 at 09:42:59PM +0530, Anshuman Gupta wrote:
> > From: Jyoti Yadav <jyoti.r.yadav@intel.com>
> > 
> > Currently this test validates DC5 upon PSR entry for supported platforms.
> > Added new file for compilation inside Makefile and Meson.
> > 
> > v2: Used the debugfs entry for DC counters instead of Registers.
> >     Used shorter names for variables.
> >     Introduced timeout to read DC counters.
> > v3: one second timeout is introduced to read DC counters.
> >     Skip the subtest if counters are not available for that platform.
> > v4: Rebased, addressed the review comment and spell correction.
> > 
> > Signed-off-by: Jyoti Yadav <jyoti.r.yadav@intel.com>
> > Signed-off-by: Anshuman Gupta <anshuman.gupta@intel.com>
> > ---
> >  tests/Makefile.sources |   1 +
> >  tests/meson.build      |   1 +
> >  tests/pm_dc.c          | 205 +++++++++++++++++++++++++++++++++++++++++++++++++
> >  3 files changed, 207 insertions(+)
> >  create mode 100644 tests/pm_dc.c
> > 
> > diff --git a/tests/Makefile.sources b/tests/Makefile.sources
> > index 34b7e44..07b9787 100644
> > --- a/tests/Makefile.sources
> > +++ b/tests/Makefile.sources
> > @@ -80,6 +80,7 @@ TESTS_progs = \
> >  	pm_lpsp \
> >  	pm_rc6_residency \
> >  	pm_rpm \
> > +	pm_dc \
> >  	pm_rps \
> >  	pm_sseu \
> >  	prime_busy \
> > diff --git a/tests/meson.build b/tests/meson.build
> > index 25b4614..3070a3e 100644
> > --- a/tests/meson.build
> > +++ b/tests/meson.build
> > @@ -66,6 +66,7 @@ test_progs = [
> >  	'pm_lpsp',
> >  	'pm_rc6_residency',
> >  	'pm_rpm',
> > +	'pm_dc',
> >  	'pm_rps',
> >  	'pm_sseu',
> >  	'prime_busy',
> > diff --git a/tests/pm_dc.c b/tests/pm_dc.c
> > new file mode 100644
> > index 0000000..d59be94
> > --- /dev/null
> > +++ b/tests/pm_dc.c
> > @@ -0,0 +1,205 @@
> > +/*
> > + * Copyright © 2018 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_sysfs.h"
> > +#include "igt_psr.h"
> > +#include <errno.h>
> > +#include <stdbool.h>
> > +#include <stdio.h>
> > +#include <string.h>
> > +#include "intel_bufmgr.h"
> > +#include "intel_io.h"
> > +#include "limits.h"
> > +
> > +
> > +typedef struct {
> > +	int drm_fd;
> > +	int debugfs_fd;
> > +	uint32_t devid;
> > +	igt_display_t display;
> > +	struct igt_fb fb_white;
> > +	enum psr_mode op_psr_mode;
> > +	drmModeModeInfo *mode;
> > +	igt_output_t *output;
> > +} data_t;
> > +
> > +/* DC State Flags */
> > +#define CHECK_DC5	1
> > +#define CHECK_DC6	2
> > +
> > +static void setup_output(data_t *data)
> > +{
> > +	igt_display_t *display = &data->display;
> > +	igt_output_t *output;
> > +	enum pipe pipe;
> > +
> > +	for_each_pipe_with_valid_output(display, pipe, output) {
> > +		drmModeConnectorPtr c = output->config.connector;
> > +
> > +		if (c->connector_type != DRM_MODE_CONNECTOR_eDP)
> > +			continue;
> > +
> > +		igt_output_set_pipe(output, pipe);
> > +		data->output = output;
> > +		data->mode = igt_output_get_mode(output);
> > +
> > +		return;
> > +	}
> > +}
> > +
> > +static void display_fini(data_t *data)
> > +{
> > +	igt_display_fini(&data->display);
> > +}
> > +
> > +static bool edp_psr_sink_support(data_t *data)
> > +{
> > +	char buf[512];
> > +
> > +	igt_debugfs_simple_read(data->debugfs_fd, "i915_edp_psr_status",
> > +			 buf, sizeof(buf));
> > +
> > +	return strstr(buf, "Sink_Support: yes\n");
> > +}
> > +
> > +static void cleanup(data_t *data)
> > +{
> > +	igt_plane_t *primary;
> > +
> > +	primary = igt_output_get_plane_type(data->output,
> > +					    DRM_PLANE_TYPE_PRIMARY);
> > +	igt_plane_set_fb(primary, NULL);
> > +	igt_display_commit(&data->display);
> > +	igt_remove_fb(data->drm_fd, &data->fb_white);
> > +}
> > +
> > +static void setup_primary(data_t *data)
> > +{
> > +	igt_plane_t *primary;
> > +
> > +	primary = igt_output_get_plane_type(data->output,
> > +					    DRM_PLANE_TYPE_PRIMARY);
> > +	igt_plane_set_fb(primary, NULL);
> > +	igt_create_color_fb(data->drm_fd,
> > +			    data->mode->hdisplay, data->mode->vdisplay,
> > +			    DRM_FORMAT_XRGB8888,
> > +			    LOCAL_I915_FORMAT_MOD_X_TILED,
> > +			    1.0, 1.0, 1.0,
> > +			    &data->fb_white);
> > +	igt_plane_set_fb(primary, &data->fb_white);
> > +	igt_display_commit(&data->display);
> > +}
> > +
> > +static uint32_t get_dc_counter(char *dc_data)
> > +{
> > +	char *e;
> > +	long ret;
> > +	char *s = strchr(dc_data, ':');
> > +
> > +	assert(s);
> > +	s++;
> > +	ret = strtol(s, &e, 10);
> > +	assert(((ret != LONG_MIN && ret != LONG_MAX) || errno != ERANGE) &&
> > +	       e > s && *e == '\n' && ret >= 0);
> > +	return ret;
> > +}
> > +
> > +static uint32_t read_dc_counter(uint32_t drm_fd, int dc_flag)
> > +{
> > +	char buf[4096];
> > +	char *str;
> > +
> > +	igt_debugfs_read(drm_fd, "i915_dmc_info", buf);
> > +	if (dc_flag & CHECK_DC5)
> > +		str = strstr(buf, "DC3 -> DC5 count");
> > +	else if (dc_flag & CHECK_DC6)
> > +		str = strstr(buf, "DC5 -> DC6 count");
> > +	igt_skip_on_f(str == NULL, "DC%d counter is not available\n",
> > +		      dc_flag & CHECK_DC5 ? 5 : 6);
> > +	return get_dc_counter(str);
> > +}
> > +
> > +bool dc_state_wait_entry(int drm_fd, int dc_flag, int prev_dc_count)
> > +{
> > +	return igt_wait(read_dc_counter(drm_fd, dc_flag) > prev_dc_count, 1000, 100);
> > +}
> > +
> > +void check_dc_counter(int drm_fd, int dc_flag, uint32_t prev_dc_count)
> > +{
> > +	igt_assert_f(dc_state_wait_entry(drm_fd, dc_flag, prev_dc_count),
> > +		     "DC%d state is not achieved\n",
> > +		     dc_flag & CHECK_DC5 ? 5 : 6);
> > +}
> > +
> > +static void test_dc_state_psr(data_t *data, int dc_flag)
> > +{
> > +	uint32_t dc_counter_before_psr;
> > +
> > +	dc_counter_before_psr = read_dc_counter(data->drm_fd, dc_flag);
> > +	setup_output(data);
> > +	setup_primary(data);
> > +	igt_assert(psr_wait_entry(data->debugfs_fd, data->op_psr_mode));
> > +	check_dc_counter(data->drm_fd, dc_flag, dc_counter_before_psr);
> > +}
> > +
> > +int main(int argc, char *argv[])
> > +{
> > +	bool has_runtime_pm;
> > +	data_t data = {};
> > +
> > +	igt_skip_on_simulation();
> > +	igt_subtest_init(argc, argv);
> > +	igt_fixture {
> > +		data.drm_fd = drm_open_driver_master(DRIVER_INTEL);
> > +		data.debugfs_fd = igt_debugfs_dir(data.drm_fd);
> > +		igt_require(data.debugfs_fd != -1);
> > +		kmstest_set_vt_graphics_mode();
> > +		data.devid = intel_get_drm_devid(data.drm_fd);
> > +		has_runtime_pm = igt_setup_runtime_pm();
> > +		igt_info("Runtime PM support: %d\n", has_runtime_pm);
> > +		igt_require(has_runtime_pm);
> > +		igt_require(igt_pm_dmc_loaded(data.debugfs_fd));
> > +		igt_display_require(&data.display, data.drm_fd);
> > +	}
> > +
> > +	igt_subtest("dc5-psr") {
> > +		data.op_psr_mode = PSR_MODE_1;
> > +		psr_enable(data.debugfs_fd, data.op_psr_mode);
> > +		igt_require_f(edp_psr_sink_support(&data),
> > +			      "Sink does not support PSR\n");
> > +		/* Check DC5 counter is available for the platform.
> > +		 * Skip the test if counter is not available.
> > +		 */
> > +		read_dc_counter(data.drm_fd, CHECK_DC5);
> > +		test_dc_state_psr(&data, CHECK_DC5);
> > +		cleanup(&data);
> 
> Why isn't cleanup paired with the corresponding setup func where setup
> is called from? Also looks like the read_dc_counter() call could be part
> of the test function.
>
While review is being progressed, i would like to bring notice to the observed 
behavior on KBL gen9. It takes around 2~4 seconds to disable "DC Off" power well
after vblank disable. This will fail the DC states verification with PSR test.
Is this really an issue to fix or we need to increase the wait time in igt test.

# tracer: function
#
#                              _-----=> irqs-off
#                             / _----=> need-resched
#                            | / _---=> hardirq/softirq
#                            || / _--=> preempt-depth
#                            ||| /     delay
#           TASK-PID   CPU#  ||||    TIMESTAMP  FUNCTION
#              | |       |   ||||       |         |
          <idle>-0     [001] d.h.  4460.902308: gen8_disable_vblank <-drm_vblank_disable_and_save
   kworker/u8:50-31687 [001] ....  4463.032879: intel_power_well_disable <-intel_display_power_put 
  
> > +	}
> > +	igt_fixture {
> > +		close(data.debugfs_fd);
> > +		display_fini(&data);
> > +	}
> > +
> > +	igt_exit();
> > +}
> > -- 
> > 2.7.4
> > 

-- 
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