[igt-dev] [PATCH i-g-t v4 3/4] test: Add PSR2 selective update tests

[Dhinakaran Pandiyan]

On Wed, 2019-01-23 at 15:56 -0800, José Roberto de Souza wrote:
> This tests checks if hardware is able to do selective update when
> screen changes.
> PSR2 don't trigger interruptions and the 'PSR2 SU status' register
> is not kept loaded all the times, so it is necessary keep polling
> PSR status debugfs until those values are loaded.
> 
> Also from DEEP_SLEEP state HW will not do a seletive update, as
> most of the memory/context is lost in deep sleep state hardware will
> need to exit PSR mode then wait a configured number of frames to
> activate PSR again to then start doing seletive updates, that is why
> just one screen change is not enough to pass this tests.
> 
> When a selective update happens and the values are loaded and read
> from debugfs it is compared with the expected value of seletive
> update blocks, if matches the polling is stopped and the test passed
> otherwise it will wait until it reachs a maximum number o screen
> changes to fail the test.
> 
> v2: Using new SU blocks debugfs output
> 
> v3:
> - removed the timerfd to fail the test, now failing based in a
> maximum number of screen changes
> - removing thread to read debugfs, read from main thread is enough
> - improved commit message
> 
> v4:
> - getting cairo context for frontbuffer test in prepare()
> - droppoing poll(), using blocking timerfd instead
> 
> Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
> Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan at intel.com>
> Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
> ---
>  lib/igt_psr.c          |  29 ++++
>  lib/igt_psr.h          |   1 +
>  tests/Makefile.sources |   1 +
>  tests/kms_psr2_su.c    | 292
> +++++++++++++++++++++++++++++++++++++++++
>  tests/meson.build      |   1 +
>  5 files changed, 324 insertions(+)
>  create mode 100644 tests/kms_psr2_su.c
> 
> diff --git a/lib/igt_psr.c b/lib/igt_psr.c
> index d726fad5..8c0f05e8 100644
> --- a/lib/igt_psr.c
> +++ b/lib/igt_psr.c
> @@ -178,3 +178,32 @@ bool psr_sink_support(int debugfs_fd, enum
> psr_mode mode)
>  		 */
>  		return strstr(buf, "Sink support: yes [0x03]");
>  }
> +
> +#define PSR2_SU_BLOCK_STR_LOOKUP "PSR2 SU blocks:\n0\t"
> +
> +static bool
> +psr2_read_last_num_su_blocks_val(int debugfs_fd, uint16_t
> *num_su_blocks)
> +{
> +	char buf[PSR_STATUS_MAX_LEN];
> +	char *str;
> +	int ret;
> +
> +	ret = igt_debugfs_simple_read(debugfs_fd,
> "i915_edp_psr_status", buf,
> +				      sizeof(buf));
> +	if (ret < 0)
> +		return false;
> +
> +	str = strstr(buf, PSR2_SU_BLOCK_STR_LOOKUP);
> +	if (!str)
> +		return false;
> +
> +	str = &str[strlen(PSR2_SU_BLOCK_STR_LOOKUP)];
> +	*num_su_blocks = (uint16_t)strtol(str, NULL, 10);
> +
> +	return true;
> +}
> +
> +bool psr2_wait_su(int debugfs_fd, uint16_t *num_su_blocks)
> +{
> +	return igt_wait(psr2_read_last_num_su_blocks_val(debugfs_fd,
> num_su_blocks), 40, 1);
> +}
> diff --git a/lib/igt_psr.h b/lib/igt_psr.h
> index 7e7017bf..49599cf8 100644
> --- a/lib/igt_psr.h
> +++ b/lib/igt_psr.h
> @@ -40,5 +40,6 @@ bool psr_wait_update(int debugfs_fd, enum psr_mode
> mode);
>  bool psr_enable(int debugfs_fd, enum psr_mode);
>  bool psr_disable(int debugfs_fd);
>  bool psr_sink_support(int debugfs_fd, enum psr_mode);
> +bool psr2_wait_su(int debugfs_fd, uint16_t *num_su_blocks);
>  
>  #endif
> diff --git a/tests/Makefile.sources b/tests/Makefile.sources
> index 519eac79..9174aecc 100644
> --- a/tests/Makefile.sources
> +++ b/tests/Makefile.sources
> @@ -80,6 +80,7 @@ TESTS_progs = \
>  	kms_plane_scaling \
>  	kms_properties \
>  	kms_psr \
> +	kms_psr2_su \
>  	kms_pwrite_crc \
>  	kms_rmfb \
>  	kms_rotation_crc \
> diff --git a/tests/kms_psr2_su.c b/tests/kms_psr2_su.c
> new file mode 100644
> index 00000000..344ddffe
> --- /dev/null
> +++ b/tests/kms_psr2_su.c
> @@ -0,0 +1,292 @@
> +/*
> + * Copyright © 2019 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 <sys/timerfd.h>
> +#include "intel_bufmgr.h"
> +
> +IGT_TEST_DESCRIPTION("Test PSR2 selective update");
> +
> +#define SQUARE_SIZE 100
> +/* each selective update block is 4 lines tall */
> +#define EXPECTED_NUM_SU_BLOCKS ((SQUARE_SIZE / 4) + (SQUARE_SIZE % 4
> ? 1 : 0))
> +
> +/*
> + * Minimum is 15 as the number of frames to active PSR2 could be
> configured
> + * to 15 frames plus a few more in case we miss a selective update
> between
> + * debugfs reads.
> + */
> +#define MAX_SCREEN_CHANGES 20
> +
> +enum operations {
> +	PAGE_FLIP,
> +	FRONTBUFFER,
> +	LAST
> +};
> +
> +static const char *op_str(enum operations op)
> +{
> +	static const char * const name[] = {
> +		[PAGE_FLIP] = "page_flip",
> +		[FRONTBUFFER] = "frontbuffer"
> +	};
> +
> +	return name[op];
> +}
> +
> +typedef struct {
> +	int drm_fd;
> +	int debugfs_fd;
> +	igt_display_t display;
> +	drm_intel_bufmgr *bufmgr;
> +	drmModeModeInfo *mode;
> +	igt_output_t *output;
> +	struct igt_fb fb[2];
> +	enum operations op;
> +	cairo_t *cr;
> +	int change_screen_timerfd;
> +	uint32_t screen_changes;
> +} data_t;
> +
> +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);

Won't this fail the same way as other PSR2 tests on WHL because of the
default mode exceeding PSR2 capability?