Re: [igt-dev] [PATCH i-g-t v2 2/5] tests/i915_pm_lpsp: lpsp platform agnostic support

["Peres, Martin" <martin.peres@intel.com>]

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On 2020-03-23 08:32, Anshuman Gupta wrote:
> Current implementation of lpsp igt test, assumed that every non-edp
> panel isn't a lpsp panel but it is not true on TGL anymore,
> any HDMI/DP/DSI panel connected on pipe A and connected to PORT_{A,B,C}
> can drive LPSP.
> Even on older Gen9 platform a DP panel can drive lpsp on Port A.
> This requires complete design change in current lpsp igt for a platform
> agnostic support.
> 
> The new igt approach is relies on connector specific debugfs
> attribute i915_lpsp_info, which exposes whether an output is capable
> of driving lpsp and whether lpsp is enabled.
> 
> v2:
> - CI failures fixup.
> 
> Signed-off-by: Anshuman Gupta <anshuman.gupta@intel.com>
> ---
>  tests/i915/i915_pm_lpsp.c | 303 +++++++++++++++++++++++---------------
>  1 file changed, 186 insertions(+), 117 deletions(-)
> 
> diff --git a/tests/i915/i915_pm_lpsp.c b/tests/i915/i915_pm_lpsp.c
> index 42938e10..e400c92e 100644
> --- a/tests/i915/i915_pm_lpsp.c
> +++ b/tests/i915/i915_pm_lpsp.c
> @@ -25,49 +25,125 @@
>   */
>  
>  #include "igt.h"
> +#include "igt_kmod.h"
> +#include "igt_pm.h"
> +#include "igt_sysfs.h"
>  #include <sys/types.h>
>  #include <sys/stat.h>
>  #include <fcntl.h>
>  #include <unistd.h>
>  
> +#define MAX_SINK_LPSP_INFO_BUF_LEN	5000
>  
> -static bool supports_lpsp(uint32_t devid)
> +#define PWR_DOMAIN_INFO "i915_power_domain_info"
> +
> +const char *snd_module[10] = {"snd_hda_codec_hdmi", "snd_hda_intel", "snd_hda_codec", "snd_hda_core", NULL};
> +
> +typedef struct {
> +	int drm_fd;
> +	int debugfs_fd;
> +	uint32_t devid;
> +	char *pwr_dmn_info;
> +	igt_display_t display;
> +	struct igt_fb fb;
> +	drmModeModeInfo *mode;
> +	igt_output_t *output;
> +} data_t;
> +
> +static void debugfs_read(int fd, const char *param, char *buf, int len)
>  {
> -	return IS_HASWELL(devid) || IS_BROADWELL(devid);
> +	len = igt_debugfs_simple_read(fd, param, buf, len);
> +	if (len < 0)
> +		igt_assert_eq(len, -ENODEV);
>  }
>  
> -static bool lpsp_is_enabled(int drm_fd)
> +static bool lpsp_is_enabled(data_t *data)
>  {
> -	uint32_t val;
> +	char buf[MAX_SINK_LPSP_INFO_BUF_LEN];
> +	int fd;
> +
> +	fd = igt_debugfs_connector_dir(data->drm_fd, data->output->name,
> +				       O_RDONLY);
> +	igt_require(fd >= 0);
> +
> +	debugfs_read(fd, "i915_lpsp_info", buf, sizeof(buf));
> +	close(fd);
>  
> -	val = INREG(HSW_PWR_WELL_CTL2);
> -	return !(val & HSW_PWR_WELL_STATE_ENABLED);
> +	return strstr(buf, "LPSP enabled");
>  }
>  
> -/* The LPSP mode is all about an enabled pipe, but we expect to also be in the
> - * low power mode when no pipes are enabled, so do this check anyway. */
> -static void screens_disabled_subtest(int drm_fd, drmModeResPtr drm_res)
> +/*
> + * The LPSP mode is all about an enabled pipe, but we expect to also be in the
> + * low power mode when no pipes are enabled, so do this check anyway.
> + */
> +static void screens_disabled_subtest(data_t *data)
>  {
> -	kmstest_unset_all_crtcs(drm_fd, drm_res);
> -	igt_assert(lpsp_is_enabled(drm_fd));
> +	igt_output_t *output;
> +	enum pipe pipe;
> +	igt_plane_t *primary;
> +
> +	for_each_pipe_with_single_output(&data->display, pipe, output) {
> +		data->output = output;
> +		igt_output_set_pipe(data->output, pipe);
> +		primary = igt_output_get_plane_type(data->output,
> +						    DRM_PLANE_TYPE_PRIMARY);
> +		igt_plane_set_fb(primary, NULL);
> +		igt_display_commit(&data->display);
> +	}
> +
> +	igt_assert(lpsp_is_enabled(data));
>  }
>  
> -static uint32_t create_fb(int drm_fd, int width, int height)
> +static void check_output_lpsp(data_t *data)
>  {
> -	struct igt_fb fb;
> +	if (igt_output_is_lpsp_capable(data->drm_fd, data->output))
> +		igt_assert_f(lpsp_is_enabled(data), "%s: lpsp is not enabled\n%s:\n%s\n",
> +			     data->output->name, PWR_DOMAIN_INFO, data->pwr_dmn_info =
> +			     igt_sysfs_get(data->debugfs_fd, PWR_DOMAIN_INFO));
> +	else
> +		igt_assert(!lpsp_is_enabled(data));
> +}
>  
> -	return igt_create_pattern_fb(drm_fd, width, height, DRM_FORMAT_XRGB8888,
> -				     LOCAL_DRM_FORMAT_MOD_NONE, &fb);
> +static void setup_lpsp_output(data_t *data)
> +{
> +	igt_plane_t *primary;
> +
> +	/* set output pipe = PIPE_A for LPSP */
> +	igt_output_set_pipe(data->output, PIPE_A);
> +	primary = igt_output_get_plane_type(data->output,
> +					    DRM_PLANE_TYPE_PRIMARY);
> +	igt_plane_set_fb(primary, NULL);
> +	igt_create_pattern_fb(data->drm_fd,
> +			      data->mode->hdisplay, data->mode->vdisplay,
> +			      DRM_FORMAT_XRGB8888,
> +			      LOCAL_DRM_FORMAT_MOD_NONE,
> +			      &data->fb);
> +	igt_plane_set_fb(primary, &data->fb);
> +	igt_display_commit(&data->display);
> +}
> +
> +static void cleanup_lpsp_output(data_t *data)
> +{
> +	igt_plane_t *primary;
> +
> +	if (!data->output)
> +		return;
> +
> +	primary = igt_output_get_plane_type(data->output,
> +					    DRM_PLANE_TYPE_PRIMARY);
> +	igt_plane_set_fb(primary, NULL);
> +	igt_output_set_pipe(data->output, PIPE_NONE);
> +	igt_display_commit(&data->display);
> +	igt_remove_fb(data->drm_fd, &data->fb);
> +	data->output = NULL;
>  }
>  
> -static void edp_subtest(int drm_fd, drmModeResPtr drm_res,
> -			drmModeConnectorPtr *drm_connectors, uint32_t devid,
> -			bool use_panel_fitter)
> +static void edp_subtest(data_t *data, bool use_panel_fitter)
>  {
> -	int i, rc;
> -	uint32_t crtc_id = 0, buffer_id = 0;
> -	drmModeConnectorPtr connector = NULL;
> -	drmModeModeInfoPtr mode = NULL;
> +	igt_display_t *display = &data->display;
> +	igt_output_t *output;
> +	int valid_output;
> +
>  	drmModeModeInfo std_1024_mode = {
>  		.clock = 65000,
>  		.hdisplay = 1024,
> @@ -86,23 +162,17 @@ static void edp_subtest(int drm_fd, drmModeResPtr drm_res,
>  		.name = "Custom 1024x768",
>  	};
>  
> -	kmstest_unset_all_crtcs(drm_fd, drm_res);
> -
> -	for (i = 0; i < drm_res->count_connectors; i++) {
> -		drmModeConnectorPtr c = drm_connectors[i];
> +	for_each_connected_output(display, output) {
> +		drmModeConnectorPtr c = output->config.connector;
>  
>  		if (c->connector_type != DRM_MODE_CONNECTOR_eDP)
>  			continue;
> -		if (c->connection != DRM_MODE_CONNECTED)
> +		if (!igt_pipe_connector_valid(PIPE_A, output))
>  			continue;
>  
> -		if (!use_panel_fitter && c->count_modes) {
> -			connector = c;
> -			mode = &c->modes[0];
> -			break;
> -		}
> +		data->output = output;
> +
>  		if (use_panel_fitter) {
> -			connector = c;
>  
>  			/* This is one of the modes Xorg creates for panels, so
>  			 * it should work just fine. Notice that Gens that
> @@ -113,124 +183,123 @@ static void edp_subtest(int drm_fd, drmModeResPtr drm_res,
>  				   c->modes[0].hdisplay > 1024);
>  			igt_assert(c->count_modes &&
>  				   c->modes[0].vdisplay > 768);
> -			mode = &std_1024_mode;
> -			break;
> +			data->mode = &std_1024_mode;
> +			igt_output_override_mode(output, data->mode);
> +		} else {
> +			data->mode = igt_output_get_mode(output);
>  		}
> -	}
> -	igt_require(connector);
>  
> -	crtc_id = kmstest_find_crtc_for_connector(drm_fd, drm_res, connector,
> -						  0);
> -	buffer_id = create_fb(drm_fd, mode->hdisplay, mode->vdisplay);
> +		setup_lpsp_output(data);
> +
> +		if (use_panel_fitter && IS_HASWELL(data->devid))
> +			igt_assert(!lpsp_is_enabled(data));
> +		else
> +			check_output_lpsp(data);
>  
> -	igt_assert(buffer_id);
> -	igt_assert(connector);
> -	igt_assert(mode);
> +		cleanup_lpsp_output(data);
> +		valid_output++;
> +	}
>  
> -	rc = drmModeSetCrtc(drm_fd, crtc_id, buffer_id, 0, 0,
> -			    &connector->connector_id, 1, mode);
> -	igt_assert_eq(rc, 0);
> +	igt_require_f(valid_output, "No edp connector found\n");
> +}
>  
> -	if (use_panel_fitter) {
> -		if (IS_HASWELL(devid))
> -			igt_assert(!lpsp_is_enabled(drm_fd));
> -		else
> -			igt_assert(lpsp_is_enabled(drm_fd));
> -	} else {
> -		igt_assert(lpsp_is_enabled(drm_fd));
> +static bool unload_snd_hda_core_module(void)
> +{
> +	int i;
> +
> +	/* unbind snd_hda_intel */
> +	kick_snd_hda_intel();
> +
> +	for (i = 0; snd_module[i]; i++) {
> +		if (igt_kmod_is_loaded(snd_module[i]) &&
> +		    igt_kmod_unload(snd_module[i], KMOD_REMOVE_FORCE)) {
> +			igt_warn("Could not unload %s\n", snd_module[i]);
> +			igt_kmod_list_loaded();
> +			igt_lsof("/dev/snd");
> +			return false;
> +		}
>  	}
> +
> +	return true;
>  }
>  
> -static void non_edp_subtest(int drm_fd, drmModeResPtr drm_res,
> -			    drmModeConnectorPtr *drm_connectors)
> +static void load_snd_hda_core_module(void)
>  {
> -	int i, rc;
> -	uint32_t crtc_id = 0, buffer_id = 0;
> -	drmModeConnectorPtr connector = NULL;
> -	drmModeModeInfoPtr mode = NULL;
> +	igt_kmod_load("snd_hda_core", NULL);
> +}
> +
> +static void non_edp_subtest(data_t *data)
> +{
> +	igt_display_t *display = &data->display;
> +	igt_output_t *output;
> +	int valid_output;
>  
> -	kmstest_unset_all_crtcs(drm_fd, drm_res);
> +	/* DP/HDMI panel requires to drive lpsp without audio */
> +	igt_require(unload_snd_hda_core_module());

I'm not super happy with having to unload modules that it would be very
easy to forget to re-add and would make audio tests fail :s

IMO, if the DUT is not playing sound, we should be able to enter LPSP.
If no, then I would consider this a driver bug for wasting energy
sending 0s to the screen.

Thoughts on this?

Martin

>  
> -	for (i = 0; i < drm_res->count_connectors; i++) {
> -		drmModeConnectorPtr c = drm_connectors[i];
> +	for_each_connected_output(display, output) {
> +		drmModeConnectorPtr c = output->config.connector;
>  
>  		if (c->connector_type == DRM_MODE_CONNECTOR_eDP)
>  			continue;
>  		if (c->connection != DRM_MODE_CONNECTED)
>  			continue;
> +		if (!igt_pipe_connector_valid(PIPE_A, output))
> +			continue;
>  
> -		if (c->count_modes) {
> -			connector = c;
> -			mode = &c->modes[0];
> -			break;
> -		}
> +		data->output = output;
> +		data->mode = igt_output_get_mode(output);
> +		setup_lpsp_output(data);
> +		check_output_lpsp(data);
> +		cleanup_lpsp_output(data);
> +		load_snd_hda_core_module();
> +		valid_output++;
>  	}
> -	igt_require(connector);
> -
> -	crtc_id = kmstest_find_crtc_for_connector(drm_fd, drm_res, connector,
> -						  0);
> -	buffer_id = create_fb(drm_fd, mode->hdisplay, mode->vdisplay);
>  
> -	igt_assert(buffer_id);
> -	igt_assert(mode);
> -
> -	rc = drmModeSetCrtc(drm_fd, crtc_id, buffer_id, 0, 0,
> -			    &connector->connector_id, 1, mode);
> -	igt_assert_eq(rc, 0);
> -
> -	igt_assert(!lpsp_is_enabled(drm_fd));
> +	igt_require_f(valid_output, "No non-edp connector found\n");
>  }
>  
> -#define MAX_CONNECTORS 32
> -
> -int drm_fd;
> -uint32_t devid;
> -drmModeResPtr drm_res;
> -drmModeConnectorPtr drm_connectors[MAX_CONNECTORS];
> -struct intel_mmio_data mmio_data;
> +IGT_TEST_DESCRIPTION("These tests validates display Low Power Single Pipe configurations");
>  igt_main
>  {
> -	igt_fixture {
> -		int i;
> -
> -		drm_fd = drm_open_driver_master(DRIVER_INTEL);
> -		igt_require(drm_fd >= 0);
> -
> -		devid = intel_get_drm_devid(drm_fd);
> +	data_t data = {};
>  
> -		drm_res = drmModeGetResources(drm_fd);
> -		igt_require(drm_res);
> -		igt_assert(drm_res->count_connectors <= MAX_CONNECTORS);
> -
> -		for (i = 0; i < drm_res->count_connectors; i++)
> -			drm_connectors[i] = drmModeGetConnectorCurrent(drm_fd,
> -							drm_res->connectors[i]);
> +	igt_fixture {
>  
> +		data.drm_fd = drm_open_driver_master(DRIVER_INTEL);
> +		igt_require(data.drm_fd >= 0);
> +		data.debugfs_fd = igt_debugfs_dir(data.drm_fd);
> +		igt_require(data.debugfs_fd >= 0);
>  		igt_pm_enable_audio_runtime_pm();
> -
> -		igt_require(supports_lpsp(devid));
> -
> -		intel_register_access_init(&mmio_data, intel_get_pci_device(), 0, drm_fd);
> -
>  		kmstest_set_vt_graphics_mode();
> +		data.devid = intel_get_drm_devid(data.drm_fd);
> +		igt_display_require(&data.display, data.drm_fd);
> +		igt_require(igt_pm_dmc_loaded(data.debugfs_fd));
>  	}
>  
> +	igt_describe("This test validates lpsp while all crtc are disabled");
>  	igt_subtest("screens-disabled")
> -		screens_disabled_subtest(drm_fd, drm_res);
> +		screens_disabled_subtest(&data);
> +	igt_describe("This test validates lpsp on eDP panel");
>  	igt_subtest("edp-native")
> -		edp_subtest(drm_fd, drm_res, drm_connectors, devid, false);
> +		edp_subtest(&data, false);
> +	igt_fixture
> +		cleanup_lpsp_output(&data);
> +	igt_describe("This test validates lpsp on eDP panel while forcing panel_fitter");
>  	igt_subtest("edp-panel-fitter")
> -		edp_subtest(drm_fd, drm_res, drm_connectors, devid, true);
> +		edp_subtest(&data, true);
> +	igt_fixture
> +		cleanup_lpsp_output(&data);
> +	igt_describe("This test validates lpsp on DP/HDMI/DSI panels");
>  	igt_subtest("non-edp")
> -		non_edp_subtest(drm_fd, drm_res, drm_connectors);
> +		non_edp_subtest(&data);
> +	igt_fixture
> +		cleanup_lpsp_output(&data);
>  
>  	igt_fixture {
> -		int i;
> -
> -		intel_register_access_fini(&mmio_data);
> -		for (i = 0; i < drm_res->count_connectors; i++)
> -			drmModeFreeConnector(drm_connectors[i]);
> -		drmModeFreeResources(drm_res);
> -		close(drm_fd);
> +		free(data.pwr_dmn_info);
> +		load_snd_hda_core_module();
> +		close(data.drm_fd);
> +		igt_display_fini(&data.display);
>  	}
>  }
> 


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