Re: [RFC PATCH v3 3/6] drm/amd/display: switch amdgpu_dm_connector to use struct drm_edid

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On 03/28, Jani Nikula wrote:
> On Wed, 27 Mar 2024, Melissa Wen <mwen@xxxxxxxxxx> wrote:
> > Replace raw edid handling (struct edid) with the opaque EDID type
> > (struct drm_edid) on amdgpu_dm_connector for consistency. It may also
> > prevent mismatch of approaches in different parts of the driver code.
> > Working in progress. It was only exercised with IGT tests.
> >
> > v2: use const to fix warnings (Alex Hung)
> > v3: fix general protection fault on mst
> >
> > Signed-off-by: Melissa Wen <mwen@xxxxxxxxxx>
> > ---
> >  .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 99 +++++++++----------
> >  .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h |  4 +-
> >  .../amd/display/amdgpu_dm/amdgpu_dm_helpers.c |  8 +-
> >  .../display/amdgpu_dm/amdgpu_dm_mst_types.c   | 24 ++---
> >  4 files changed, 67 insertions(+), 68 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> > index 280562707cd0..bbbf9c9d40d5 100644
> > --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> > +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> > @@ -3269,18 +3269,19 @@ void amdgpu_dm_update_connector_after_detect(
> >  		aconnector->dc_sink = sink;
> >  		dc_sink_retain(aconnector->dc_sink);
> >  		if (sink->dc_edid.length == 0) {
> > -			aconnector->edid = NULL;
> > +			drm_edid_free(aconnector->edid);
> 
> If aconnector->edid is used as some kind of cache, it might be prudent
> to still set it to NULL.

Makes sense. Thanks for pointing it out.
> 
> It's up to the amd maintainers, but personally I've renamed any ->edid
> fields to ->drm_edid when I've done these conversions to ensure every
> single place is covered, and also later stable backports will give a
> build failure if the change is not taken into account.

I see. Good points. I'll follow your advice and do this name change in
the next version.
> 
> >  			if (aconnector->dc_link->aux_mode) {
> >  				drm_dp_cec_unset_edid(
> >  					&aconnector->dm_dp_aux.aux);
> >  			}
> >  		} else {
> > -			aconnector->edid =
> > -				(struct edid *)sink->dc_edid.raw_edid;
> > +			const struct edid *edid = (const struct edid *)sink->dc_edid.raw_edid;
> > +			aconnector->edid = drm_edid_alloc(edid, sink->dc_edid.length);
> >  
> > +			/* FIXME: Get rid of drm_edid_raw() */
> >  			if (aconnector->dc_link->aux_mode)
> >  				drm_dp_cec_set_edid(&aconnector->dm_dp_aux.aux,
> > -						    aconnector->edid);
> > +						    drm_edid_raw(aconnector->edid));
> 
> The goal should be to switch to use CEC functions that take the source
> physical address directly instead of parsing the EDID.

Yes, I understand I have the same goal as in the next patch:
- https://lore.kernel.org/dri-devel/20240327214953.367126-5-mwen@xxxxxxxxxx/

Am I missing something?

> 
> >  		}
> >  
> >  		if (!aconnector->timing_requested) {
> > @@ -3291,17 +3292,17 @@ void amdgpu_dm_update_connector_after_detect(
> >  					"failed to create aconnector->requested_timing\n");
> >  		}
> >  
> > -		drm_connector_update_edid_property(connector, aconnector->edid);
> > +		drm_edid_connector_update(connector, aconnector->edid);
> >  		amdgpu_dm_update_freesync_caps(connector, aconnector->edid);
> >  		update_connector_ext_caps(aconnector);
> >  	} else {
> >  		drm_dp_cec_unset_edid(&aconnector->dm_dp_aux.aux);
> >  		amdgpu_dm_update_freesync_caps(connector, NULL);
> > -		drm_connector_update_edid_property(connector, NULL);
> > +		drm_edid_connector_update(connector, NULL);
> >  		aconnector->num_modes = 0;
> >  		dc_sink_release(aconnector->dc_sink);
> >  		aconnector->dc_sink = NULL;
> > -		aconnector->edid = NULL;
> > +		drm_edid_free(aconnector->edid);
> >  		kfree(aconnector->timing_requested);
> >  		aconnector->timing_requested = NULL;
> >  		/* Set CP to DESIRED if it was ENABLED, so we can re-enable it again on hotplug */
> > @@ -6661,13 +6662,7 @@ static void amdgpu_dm_connector_funcs_force(struct drm_connector *connector)
> >  	struct amdgpu_dm_connector *aconnector = to_amdgpu_dm_connector(connector);
> >  	struct dc_link *dc_link = aconnector->dc_link;
> >  	struct dc_sink *dc_em_sink = aconnector->dc_em_sink;
> > -	struct edid *edid;
> > -	struct i2c_adapter *ddc;
> > -
> > -	if (dc_link && dc_link->aux_mode)
> > -		ddc = &aconnector->dm_dp_aux.aux.ddc;
> > -	else
> > -		ddc = &aconnector->i2c->base;
> > +	const struct drm_edid *drm_edid;
> >  
> >  	/*
> >  	 * Note: drm_get_edid gets edid in the following order:
> > @@ -6675,18 +6670,20 @@ static void amdgpu_dm_connector_funcs_force(struct drm_connector *connector)
> >  	 * 2) firmware EDID if set via edid_firmware module parameter
> >  	 * 3) regular DDC read.
> >  	 */
> > -	edid = drm_get_edid(connector, ddc);
> > -	if (!edid) {
> > +	drm_edid = drm_edid_read(connector);
> 
> You should call drm_edid_connector_update() here to clear the EDID
> property etc. if it's NULL.
> 
> Ditto everywhere.
> 
> Due to a historical mistake, drm_get_edid() does that for you, but
> shouldn't really.

Oh, okay. I'll review the overall usage in this series. Thanks for
warning.
> 
> > +
> > +	if (!drm_edid) {
> >  		DRM_ERROR("No EDID found on connector: %s.\n", connector->name);
> >  		return;
> >  	}
> > -
> > -	aconnector->edid = edid;
> > -
> > +	aconnector->edid = drm_edid;
> > +	drm_edid_connector_update(connector, drm_edid);
> >  	/* Update emulated (virtual) sink's EDID */
> >  	if (dc_em_sink && dc_link) {
> > +		const struct edid *edid = drm_edid_raw(drm_edid); // FIXME: Get rid of drm_edid_raw()
> > +
> >  		memset(&dc_em_sink->edid_caps, 0, sizeof(struct dc_edid_caps));
> > -		memmove(dc_em_sink->dc_edid.raw_edid, edid, (edid->extensions + 1) * EDID_LENGTH);
> > +		memmove(dc_em_sink->dc_edid.raw_edid, (uint8_t *)edid, (edid->extensions + 1) * EDID_LENGTH);
> >  		dm_helpers_parse_edid_caps(
> >  			dc_link,
> >  			&dc_em_sink->dc_edid,
> > @@ -6716,18 +6713,12 @@ static int get_modes(struct drm_connector *connector)
> >  static void create_eml_sink(struct amdgpu_dm_connector *aconnector)
> >  {
> >  	struct drm_connector *connector = &aconnector->base;
> > -	struct dc_link *dc_link = aconnector->dc_link;
> >  	struct dc_sink_init_data init_params = {
> >  			.link = aconnector->dc_link,
> >  			.sink_signal = SIGNAL_TYPE_VIRTUAL
> >  	};
> > -	struct edid *edid;
> > -	struct i2c_adapter *ddc;
> > -
> > -	if (dc_link->aux_mode)
> > -		ddc = &aconnector->dm_dp_aux.aux.ddc;
> > -	else
> > -		ddc = &aconnector->i2c->base;
> > +	const struct drm_edid *drm_edid;
> > +	const struct edid *edid;
> >  
> >  	/*
> >  	 * Note: drm_get_edid gets edid in the following order:
> > @@ -6735,17 +6726,19 @@ static void create_eml_sink(struct amdgpu_dm_connector *aconnector)
> >  	 * 2) firmware EDID if set via edid_firmware module parameter
> >  	 * 3) regular DDC read.
> >  	 */
> > -	edid = drm_get_edid(connector, ddc);
> > -	if (!edid) {
> > +	drm_edid = drm_edid_read(connector);
> > +	if (!drm_edid) {
> >  		DRM_ERROR("No EDID found on connector: %s.\n", connector->name);
> >  		return;
> >  	}
> >  
> > -	if (drm_detect_hdmi_monitor(edid))
> > +	if (connector->display_info.is_hdmi)
> >  		init_params.sink_signal = SIGNAL_TYPE_HDMI_TYPE_A;
> >  
> > -	aconnector->edid = edid;
> > +	aconnector->edid = drm_edid;
> > +	drm_edid_connector_update(connector, drm_edid);
> >  
> > +	edid = drm_edid_raw(drm_edid); // FIXME: Get rid of drm_edid_raw()
> >  	aconnector->dc_em_sink = dc_link_add_remote_sink(
> >  		aconnector->dc_link,
> >  		(uint8_t *)edid,
> > @@ -7428,16 +7421,16 @@ static void amdgpu_set_panel_orientation(struct drm_connector *connector)
> >  }
> >  
> >  static void amdgpu_dm_connector_ddc_get_modes(struct drm_connector *connector,
> > -					      struct edid *edid)
> > +					      const struct drm_edid *drm_edid)
> >  {
> >  	struct amdgpu_dm_connector *amdgpu_dm_connector =
> >  			to_amdgpu_dm_connector(connector);
> >  
> > -	if (edid) {
> > +	if (drm_edid) {
> >  		/* empty probed_modes */
> >  		INIT_LIST_HEAD(&connector->probed_modes);
> >  		amdgpu_dm_connector->num_modes =
> > -				drm_add_edid_modes(connector, edid);
> > +				drm_edid_connector_add_modes(connector);
> >  
> >  		/* sorting the probed modes before calling function
> >  		 * amdgpu_dm_get_native_mode() since EDID can have
> > @@ -7451,10 +7444,10 @@ static void amdgpu_dm_connector_ddc_get_modes(struct drm_connector *connector,
> >  		amdgpu_dm_get_native_mode(connector);
> >  
> >  		/* Freesync capabilities are reset by calling
> > -		 * drm_add_edid_modes() and need to be
> > +		 * drm_edid_connector_add_modes() and need to be
> >  		 * restored here.
> >  		 */
> > -		amdgpu_dm_update_freesync_caps(connector, edid);
> > +		amdgpu_dm_update_freesync_caps(connector, drm_edid);
> >  	} else {
> >  		amdgpu_dm_connector->num_modes = 0;
> >  	}
> > @@ -7550,12 +7543,12 @@ static uint add_fs_modes(struct amdgpu_dm_connector *aconnector)
> >  }
> >  
> >  static void amdgpu_dm_connector_add_freesync_modes(struct drm_connector *connector,
> > -						   struct edid *edid)
> > +						   const struct drm_edid *drm_edid)
> >  {
> >  	struct amdgpu_dm_connector *amdgpu_dm_connector =
> >  		to_amdgpu_dm_connector(connector);
> >  
> > -	if (!(amdgpu_freesync_vid_mode && edid))
> > +	if (!(amdgpu_freesync_vid_mode && drm_edid))
> >  		return;
> >  
> >  	if (amdgpu_dm_connector->max_vfreq - amdgpu_dm_connector->min_vfreq > 10)
> > @@ -7568,23 +7561,23 @@ static int amdgpu_dm_connector_get_modes(struct drm_connector *connector)
> >  	struct amdgpu_dm_connector *amdgpu_dm_connector =
> >  			to_amdgpu_dm_connector(connector);
> >  	struct drm_encoder *encoder;
> > -	struct edid *edid = amdgpu_dm_connector->edid;
> > +	const struct drm_edid *drm_edid = amdgpu_dm_connector->edid;
> >  	struct dc_link_settings *verified_link_cap =
> >  			&amdgpu_dm_connector->dc_link->verified_link_cap;
> >  	const struct dc *dc = amdgpu_dm_connector->dc_link->dc;
> >  
> >  	encoder = amdgpu_dm_connector_to_encoder(connector);
> >  
> > -	if (!drm_edid_is_valid(edid)) {
> > +	if (!drm_edid_valid(drm_edid)) {
> 
> I don't think there should be reasons to validate the EDID at this
> point. The EDID reading functions do that, and any amd driver specific
> mechanisms should do that separately before setting ->edid. So it should
> be just a NULL check here.
> 
> >  		amdgpu_dm_connector->num_modes =
> >  				drm_add_modes_noedid(connector, 640, 480);
> >  		if (dc->link_srv->dp_get_encoding_format(verified_link_cap) == DP_128b_132b_ENCODING)
> >  			amdgpu_dm_connector->num_modes +=
> >  				drm_add_modes_noedid(connector, 1920, 1080);
> >  	} else {
> > -		amdgpu_dm_connector_ddc_get_modes(connector, edid);
> > +		amdgpu_dm_connector_ddc_get_modes(connector, drm_edid);
> >  		amdgpu_dm_connector_add_common_modes(encoder, connector);
> > -		amdgpu_dm_connector_add_freesync_modes(connector, edid);
> > +		amdgpu_dm_connector_add_freesync_modes(connector, drm_edid);
> >  	}
> >  	amdgpu_dm_fbc_init(connector);
> >  
> > @@ -11153,7 +11146,7 @@ static bool parse_edid_cea(struct amdgpu_dm_connector *aconnector,
> >  }
> >  
> >  static int parse_amd_vsdb(struct amdgpu_dm_connector *aconnector,
> > -			  struct edid *edid, struct amdgpu_hdmi_vsdb_info *vsdb_info)
> > +			  const struct edid *edid, struct amdgpu_hdmi_vsdb_info *vsdb_info)
> >  {
> >  	u8 *edid_ext = NULL;
> >  	int i;
> > @@ -11188,7 +11181,8 @@ static int parse_amd_vsdb(struct amdgpu_dm_connector *aconnector,
> >  }
> >  
> >  static int parse_hdmi_amd_vsdb(struct amdgpu_dm_connector *aconnector,
> > -		struct edid *edid, struct amdgpu_hdmi_vsdb_info *vsdb_info)
> > +			       const struct edid *edid,
> > +			       struct amdgpu_hdmi_vsdb_info *vsdb_info)
> >  {
> >  	u8 *edid_ext = NULL;
> >  	int i;
> > @@ -11230,19 +11224,19 @@ static int parse_hdmi_amd_vsdb(struct amdgpu_dm_connector *aconnector,
> >   * FreeSync parameters.
> >   */
> >  void amdgpu_dm_update_freesync_caps(struct drm_connector *connector,
> > -				    struct edid *edid)
> > +				    const struct drm_edid *drm_edid)
> >  {
> >  	int i = 0;
> > -	struct detailed_timing *timing;
> > -	struct detailed_non_pixel *data;
> > -	struct detailed_data_monitor_range *range;
> > +	const struct detailed_timing *timing;
> > +	const struct detailed_non_pixel *data;
> > +	const struct detailed_data_monitor_range *range;
> >  	struct amdgpu_dm_connector *amdgpu_dm_connector =
> >  			to_amdgpu_dm_connector(connector);
> >  	struct dm_connector_state *dm_con_state = NULL;
> >  	struct dc_sink *sink;
> > -
> >  	struct amdgpu_device *adev = drm_to_adev(connector->dev);
> >  	struct amdgpu_hdmi_vsdb_info vsdb_info = {0};
> > +	const struct edid *edid;
> >  	bool freesync_capable = false;
> >  	enum adaptive_sync_type as_type = ADAPTIVE_SYNC_TYPE_NONE;
> >  
> > @@ -11255,7 +11249,7 @@ void amdgpu_dm_update_freesync_caps(struct drm_connector *connector,
> >  		amdgpu_dm_connector->dc_sink :
> >  		amdgpu_dm_connector->dc_em_sink;
> >  
> > -	if (!edid || !sink) {
> > +	if (!drm_edid || !sink) {
> >  		dm_con_state = to_dm_connector_state(connector->state);
> >  
> >  		amdgpu_dm_connector->min_vfreq = 0;
> > @@ -11272,6 +11266,7 @@ void amdgpu_dm_update_freesync_caps(struct drm_connector *connector,
> >  	if (!adev->dm.freesync_module)
> >  		goto update;
> >  
> > +	edid = drm_edid_raw(drm_edid); // FIXME: Get rid of drm_edid_raw()
> >  	if (edid && (sink->sink_signal == SIGNAL_TYPE_DISPLAY_PORT ||
> >  		     sink->sink_signal == SIGNAL_TYPE_EDP)) {
> >  		bool edid_check_required = false;
> > @@ -11341,7 +11336,7 @@ void amdgpu_dm_update_freesync_caps(struct drm_connector *connector,
> >  			amdgpu_dm_connector->as_type = ADAPTIVE_SYNC_TYPE_EDP;
> >  		}
> >  
> > -	} else if (edid && sink->sink_signal == SIGNAL_TYPE_HDMI_TYPE_A) {
> > +	} else if (drm_edid && sink->sink_signal == SIGNAL_TYPE_HDMI_TYPE_A) {
> >  		i = parse_hdmi_amd_vsdb(amdgpu_dm_connector, edid, &vsdb_info);
> >  		if (i >= 0 && vsdb_info.freesync_supported) {
> >  			amdgpu_dm_connector->min_vfreq = vsdb_info.min_refresh_rate_hz;
> > diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
> > index 67647bb5999b..384f68203590 100644
> > --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
> > +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
> > @@ -637,7 +637,7 @@ struct amdgpu_dm_connector {
> >  
> >  	/* we need to mind the EDID between detect
> >  	   and get modes due to analog/digital/tvencoder */
> > -	struct edid *edid;
> > +	const struct drm_edid *edid;
> 
> As I said, I'd make this drm_edid. But not my call.
> 
> BR,
> Jani.
> 
> >  
> >  	/* shared with amdgpu */
> >  	struct amdgpu_hpd hpd;
> > @@ -908,7 +908,7 @@ void dm_restore_drm_connector_state(struct drm_device *dev,
> >  				    struct drm_connector *connector);
> >  
> >  void amdgpu_dm_update_freesync_caps(struct drm_connector *connector,
> > -					struct edid *edid);
> > +				    const struct drm_edid *drm_edid);
> >  
> >  void amdgpu_dm_trigger_timing_sync(struct drm_device *dev);
> >  
> > diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
> > index c27063305a13..1a37dff9c2b6 100644
> > --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
> > +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
> > @@ -901,7 +901,8 @@ enum dc_edid_status dm_helpers_read_local_edid(
> >  	struct i2c_adapter *ddc;
> >  	int retry = 3;
> >  	enum dc_edid_status edid_status;
> > -	struct edid *edid;
> > +	const struct drm_edid *drm_edid;
> > +	const struct edid *edid;
> >  
> >  	if (link->aux_mode)
> >  		ddc = &aconnector->dm_dp_aux.aux.ddc;
> > @@ -913,7 +914,8 @@ enum dc_edid_status dm_helpers_read_local_edid(
> >  	 */
> >  	do {
> >  
> > -		edid = drm_get_edid(&aconnector->base, ddc);
> > +		drm_edid = drm_edid_read_ddc(connector, ddc);
> > +		edid = drm_edid_raw(drm_edid); // FIXME: Get rid of drm_edid_raw()
> >  
> >  		/* DP Compliance Test 4.2.2.6 */
> >  		if (link->aux_mode && connector->edid_corrupt)
> > @@ -931,7 +933,7 @@ enum dc_edid_status dm_helpers_read_local_edid(
> >  		memmove(sink->dc_edid.raw_edid, (uint8_t *)edid, sink->dc_edid.length);
> >  
> >  		/* We don't need the original edid anymore */
> > -		kfree(edid);
> > +		drm_edid_free(drm_edid);
> >  
> >  		edid_status = dm_helpers_parse_edid_caps(
> >  						link,
> > diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
> > index 941e96f100f4..a28004f9378a 100644
> > --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
> > +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
> > @@ -128,7 +128,7 @@ dm_dp_mst_connector_destroy(struct drm_connector *connector)
> >  		dc_sink_release(aconnector->dc_sink);
> >  	}
> >  
> > -	kfree(aconnector->edid);
> > +	drm_edid_free(aconnector->edid);
> >  
> >  	drm_connector_cleanup(connector);
> >  	drm_dp_mst_put_port_malloc(aconnector->mst_output_port);
> > @@ -298,15 +298,15 @@ static int dm_dp_mst_get_modes(struct drm_connector *connector)
> >  		return drm_add_edid_modes(connector, NULL);
> >  
> >  	if (!aconnector->edid) {
> > -		struct edid *edid;
> > +		const struct drm_edid *drm_edid;
> >  
> > -		edid = drm_dp_mst_get_edid(connector, &aconnector->mst_root->mst_mgr, aconnector->mst_output_port);
> > +		drm_edid = drm_dp_mst_edid_read(connector, &aconnector->mst_root->mst_mgr, aconnector->mst_output_port);
> >  
> > -		if (!edid) {
> > +		if (!drm_edid) {
> >  			amdgpu_dm_set_mst_status(&aconnector->mst_status,
> >  			MST_REMOTE_EDID, false);
> >  
> > -			drm_connector_update_edid_property(
> > +			drm_edid_connector_update(
> >  				&aconnector->base,
> >  				NULL);
> >  
> > @@ -340,7 +340,7 @@ static int dm_dp_mst_get_modes(struct drm_connector *connector)
> >  			return ret;
> >  		}
> >  
> > -		aconnector->edid = edid;
> > +		aconnector->edid = drm_edid;
> >  		amdgpu_dm_set_mst_status(&aconnector->mst_status,
> >  			MST_REMOTE_EDID, true);
> >  	}
> > @@ -355,10 +355,13 @@ static int dm_dp_mst_get_modes(struct drm_connector *connector)
> >  		struct dc_sink_init_data init_params = {
> >  				.link = aconnector->dc_link,
> >  				.sink_signal = SIGNAL_TYPE_DISPLAY_PORT_MST };
> > +		const struct edid *edid;
> > +
> > +		edid = drm_edid_raw(aconnector->edid); // FIXME: Get rid of drm_edid_raw()
> >  		dc_sink = dc_link_add_remote_sink(
> >  			aconnector->dc_link,
> > -			(uint8_t *)aconnector->edid,
> > -			(aconnector->edid->extensions + 1) * EDID_LENGTH,
> > +			(uint8_t *)edid,
> > +			(edid->extensions + 1) * EDID_LENGTH,
> >  			&init_params);
> >  
> >  		if (!dc_sink) {
> > @@ -412,10 +415,9 @@ static int dm_dp_mst_get_modes(struct drm_connector *connector)
> >  		}
> >  	}
> >  
> > -	drm_connector_update_edid_property(
> > -					&aconnector->base, aconnector->edid);
> > +	drm_edid_connector_update(&aconnector->base, aconnector->edid);
> >  
> > -	ret = drm_add_edid_modes(connector, aconnector->edid);
> > +	ret = drm_edid_connector_add_modes(connector);
> >  
> >  	return ret;
> >  }
> 
> -- 
> Jani Nikula, Intel



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