drivers/gpu/drm/xe/xe_rtp.c - linux - Git at Google

 // SPDX-License-Identifier: MIT
 /*
  * Copyright © 2022 Intel Corporation
  */

 #include "xe_rtp.h"

 #include <kunit/visibility.h>

 #include <drm/xe_drm.h>

 #include "xe_gt.h"
 #include "xe_gt_topology.h"
 #include "xe_macros.h"
 #include "xe_reg_sr.h"
 #include "xe_sriov.h"

 /**
  * DOC: Register Table Processing
  *
  * Internal infrastructure to define how registers should be updated based on
  * rules and actions. This can be used to define tables with multiple entries
  * (one per register) that will be walked over at some point in time to apply
  * the values to the registers that have matching rules.
  */

 static bool has_samedia(const struct xe_device *xe)
 {
 	return xe->info.media_verx100 >= 1300;
 }

 static bool rule_matches(const struct xe_device *xe,
 			 struct xe_gt *gt,
 			 struct xe_hw_engine *hwe,
 			 const struct xe_rtp_rule *rules,
 			 unsigned int n_rules)
 {
 	const struct xe_rtp_rule *r;
 	unsigned int i, rcount = 0;
 	bool match;

 	for (r = rules, i = 0; i < n_rules; r = &rules[++i]) {
 		switch (r->match_type) {
 		case XE_RTP_MATCH_OR:
 			/*
 			 * This is only reached if a complete set of
 			 * rules passed or none were evaluated. For both cases,
 			 * shortcut the other rules and return the proper value.
 			 */
 			goto done;
 		case XE_RTP_MATCH_PLATFORM:
 			match = xe->info.platform == r->platform;
 			break;
 		case XE_RTP_MATCH_SUBPLATFORM:
 			match = xe->info.platform == r->platform &&
 				xe->info.subplatform == r->subplatform;
 			break;
 		case XE_RTP_MATCH_GRAPHICS_VERSION:
 			match = xe->info.graphics_verx100 == r->ver_start &&
 				(!has_samedia(xe) || !xe_gt_is_media_type(gt));
 			break;
 		case XE_RTP_MATCH_GRAPHICS_VERSION_RANGE:
 			match = xe->info.graphics_verx100 >= r->ver_start &&
 				xe->info.graphics_verx100 <= r->ver_end &&
 				(!has_samedia(xe) || !xe_gt_is_media_type(gt));
 			break;
 		case XE_RTP_MATCH_GRAPHICS_VERSION_ANY_GT:
 			match = xe->info.graphics_verx100 == r->ver_start;
 			break;
 		case XE_RTP_MATCH_GRAPHICS_STEP:
 			match = xe->info.step.graphics >= r->step_start &&
 				xe->info.step.graphics < r->step_end &&
 				(!has_samedia(xe) || !xe_gt_is_media_type(gt));
 			break;
 		case XE_RTP_MATCH_MEDIA_VERSION:
 			match = xe->info.media_verx100 == r->ver_start &&
 				(!has_samedia(xe) || xe_gt_is_media_type(gt));
 			break;
 		case XE_RTP_MATCH_MEDIA_VERSION_RANGE:
 			match = xe->info.media_verx100 >= r->ver_start &&
 				xe->info.media_verx100 <= r->ver_end &&
 				(!has_samedia(xe) || xe_gt_is_media_type(gt));
 			break;
 		case XE_RTP_MATCH_MEDIA_STEP:
 			match = xe->info.step.media >= r->step_start &&
 				xe->info.step.media < r->step_end &&
 				(!has_samedia(xe) || xe_gt_is_media_type(gt));
 			break;
 		case XE_RTP_MATCH_MEDIA_VERSION_ANY_GT:
 			match = xe->info.media_verx100 == r->ver_start;
 			break;
 		case XE_RTP_MATCH_INTEGRATED:
 			match = !xe->info.is_dgfx;
 			break;
 		case XE_RTP_MATCH_DISCRETE:
 			match = xe->info.is_dgfx;
 			break;
 		case XE_RTP_MATCH_ENGINE_CLASS:
 			if (drm_WARN_ON(&xe->drm, !hwe))
 				return false;

 			match = hwe->class == r->engine_class;
 			break;
 		case XE_RTP_MATCH_NOT_ENGINE_CLASS:
 			if (drm_WARN_ON(&xe->drm, !hwe))
 				return false;

 			match = hwe->class != r->engine_class;
 			break;
 		case XE_RTP_MATCH_FUNC:
 			match = r->match_func(gt, hwe);
 			break;
 		default:
 			drm_warn(&xe->drm, "Invalid RTP match %u\n",
 				 r->match_type);
 			match = false;
 		}

 		if (!match) {
 			/*
 			 * Advance rules until we find XE_RTP_MATCH_OR to check
 			 * if there's another set of conditions to check
 			 */
 			while (++i < n_rules && rules[i].match_type != XE_RTP_MATCH_OR)
 				;

 			if (i >= n_rules)
 				return false;

 			rcount = 0;
 		} else {
 			rcount++;
 		}
 	}

 done:
 	if (drm_WARN_ON(&xe->drm, !rcount))
 		return false;

 	return true;
 }

 static void rtp_add_sr_entry(const struct xe_rtp_action *action,
 			     struct xe_gt *gt,
 			     u32 mmio_base,
 			     struct xe_reg_sr *sr)
 {
 	struct xe_reg_sr_entry sr_entry = {
 		.reg = action->reg,
 		.clr_bits = action->clr_bits,
 		.set_bits = action->set_bits,
 		.read_mask = action->read_mask,
 	};

 	sr_entry.reg.addr += mmio_base;
 	xe_reg_sr_add(sr, &sr_entry, gt);
 }

 static bool rtp_process_one_sr(const struct xe_rtp_entry_sr *entry,
 			       struct xe_device *xe, struct xe_gt *gt,
 			       struct xe_hw_engine *hwe, struct xe_reg_sr *sr)
 {
 	const struct xe_rtp_action *action;
 	u32 mmio_base;
 	unsigned int i;

 	if (!rule_matches(xe, gt, hwe, entry->rules, entry->n_rules))
 		return false;

 	for (i = 0, action = &entry->actions[0]; i < entry->n_actions; action++, i++) {
 		if ((entry->flags & XE_RTP_ENTRY_FLAG_FOREACH_ENGINE) ||
 		    (action->flags & XE_RTP_ACTION_FLAG_ENGINE_BASE))
 			mmio_base = hwe->mmio_base;
 		else
 			mmio_base = 0;

 		rtp_add_sr_entry(action, gt, mmio_base, sr);
 	}

 	return true;
 }

 static void rtp_get_context(struct xe_rtp_process_ctx *ctx,
 			    struct xe_hw_engine **hwe,
 			    struct xe_gt **gt,
 			    struct xe_device **xe)
 {
 	switch (ctx->type) {
 	case XE_RTP_PROCESS_TYPE_GT:
 		*hwe = NULL;
 		*gt = ctx->gt;
 		*xe = gt_to_xe(*gt);
 		break;
 	case XE_RTP_PROCESS_TYPE_ENGINE:
 		*hwe = ctx->hwe;
 		*gt = (*hwe)->gt;
 		*xe = gt_to_xe(*gt);
 		break;
 	};
 }

 /**
  * xe_rtp_process_ctx_enable_active_tracking - Enable tracking of active entries
  *
  * Set additional metadata to track what entries are considered "active", i.e.
  * their rules match the condition. Bits are never cleared: entries with
  * matching rules set the corresponding bit in the bitmap.
  *
  * @ctx: The context for processing the table
  * @active_entries: bitmap to store the active entries
  * @n_entries: number of entries to be processed
  */
 void xe_rtp_process_ctx_enable_active_tracking(struct xe_rtp_process_ctx *ctx,
 					       unsigned long *active_entries,
 					       size_t n_entries)
 {
 	ctx->active_entries = active_entries;
 	ctx->n_entries = n_entries;
 }

 static void rtp_mark_active(struct xe_device *xe,
 			    struct xe_rtp_process_ctx *ctx,
 			    unsigned int first, unsigned int last)
 {
 	if (!ctx->active_entries)
 		return;

 	if (drm_WARN_ON(&xe->drm, last > ctx->n_entries))
 		return;

 	if (first == last)
 		bitmap_set(ctx->active_entries, first, 1);
 	else
 		bitmap_set(ctx->active_entries, first, last - first + 1);
 }

 /**
  * xe_rtp_process_to_sr - Process all rtp @entries, adding the matching ones to
  *                        the save-restore argument.
  * @ctx: The context for processing the table, with one of device, gt or hwe
  * @entries: Table with RTP definitions
  * @sr: Save-restore struct where matching rules execute the action. This can be
  *      viewed as the "coalesced view" of multiple the tables. The bits for each
  *      register set are expected not to collide with previously added entries
  *
  * Walk the table pointed by @entries (with an empty sentinel) and add all
  * entries with matching rules to @sr. If @hwe is not NULL, its mmio_base is
  * used to calculate the right register offset
  */
 void xe_rtp_process_to_sr(struct xe_rtp_process_ctx *ctx,
 			  const struct xe_rtp_entry_sr *entries,
 			  struct xe_reg_sr *sr)
 {
 	const struct xe_rtp_entry_sr *entry;
 	struct xe_hw_engine *hwe = NULL;
 	struct xe_gt *gt = NULL;
 	struct xe_device *xe = NULL;

 	rtp_get_context(ctx, &hwe, &gt, &xe);

 	if (IS_SRIOV_VF(xe))
 		return;

 	for (entry = entries; entry && entry->name; entry++) {
 		bool match = false;

 		if (entry->flags & XE_RTP_ENTRY_FLAG_FOREACH_ENGINE) {
 			struct xe_hw_engine *each_hwe;
 			enum xe_hw_engine_id id;

 			for_each_hw_engine(each_hwe, gt, id)
 				match |= rtp_process_one_sr(entry, xe, gt,
 							    each_hwe, sr);
 		} else {
 			match = rtp_process_one_sr(entry, xe, gt, hwe, sr);
 		}

 		if (match)
 			rtp_mark_active(xe, ctx, entry - entries,
 					entry - entries);
 	}
 }
 EXPORT_SYMBOL_IF_KUNIT(xe_rtp_process_to_sr);

 /**
  * xe_rtp_process - Process all rtp @entries, without running any action
  * @ctx: The context for processing the table, with one of device, gt or hwe
  * @entries: Table with RTP definitions
  *
  * Walk the table pointed by @entries (with an empty sentinel), executing the
  * rules. A few differences from xe_rtp_process_to_sr():
  *
  * 1. There is no action associated with each entry since this uses
  *    struct xe_rtp_entry. Its main use is for marking active workarounds via
  *    xe_rtp_process_ctx_enable_active_tracking().
  * 2. There is support for OR operations by having entries with no name.
  */
 void xe_rtp_process(struct xe_rtp_process_ctx *ctx,
 		    const struct xe_rtp_entry *entries)
 {
 	const struct xe_rtp_entry *entry, *first_entry;
 	struct xe_hw_engine *hwe;
 	struct xe_gt *gt;
 	struct xe_device *xe;

 	rtp_get_context(ctx, &hwe, &gt, &xe);

 	first_entry = entries;
 	if (drm_WARN_ON(&xe->drm, !first_entry->name))
 		return;

 	for (entry = entries; entry && entry->rules; entry++) {
 		if (entry->name)
 			first_entry = entry;

 		if (!rule_matches(xe, gt, hwe, entry->rules, entry->n_rules))
 			continue;

 		/* Fast-forward entry, eliminating the OR'ed entries */
 		for (entry++; entry && entry->rules; entry++)
 			if (entry->name)
 				break;
 		entry--;

 		rtp_mark_active(xe, ctx, first_entry - entries,
 				entry - entries);
 	}
 }

 bool xe_rtp_match_even_instance(const struct xe_gt *gt,
 				const struct xe_hw_engine *hwe)
 {
 	return hwe->instance % 2 == 0;
 }

 bool xe_rtp_match_first_render_or_compute(const struct xe_gt *gt,
 					  const struct xe_hw_engine *hwe)
 {
 	u64 render_compute_mask = gt->info.engine_mask &
 		(XE_HW_ENGINE_CCS_MASK | XE_HW_ENGINE_RCS_MASK);

 	return render_compute_mask &&
 		hwe->engine_id == __ffs(render_compute_mask);
 }

 bool xe_rtp_match_first_gslice_fused_off(const struct xe_gt *gt,
 					 const struct xe_hw_engine *hwe)
 {
 	unsigned int dss_per_gslice = 4;
 	unsigned int dss;

 	if (drm_WARN(&gt_to_xe(gt)->drm, xe_dss_mask_empty(gt->fuse_topo.g_dss_mask),
 		     "Checking gslice for platform without geometry pipeline\n"))
 		return false;

 	dss = xe_dss_mask_group_ffs(gt->fuse_topo.g_dss_mask, 0, 0);

 	return dss >= dss_per_gslice;
 }
	// SPDX-License-Identifier: MIT
	/*
	* Copyright © 2022 Intel Corporation
	*/

	#include "xe_rtp.h"

	#include <kunit/visibility.h>

	#include <drm/xe_drm.h>

	#include "xe_gt.h"
	#include "xe_gt_topology.h"
	#include "xe_macros.h"
	#include "xe_reg_sr.h"
	#include "xe_sriov.h"

	/**
	* DOC: Register Table Processing
	*
	* Internal infrastructure to define how registers should be updated based on
	* rules and actions. This can be used to define tables with multiple entries
	* (one per register) that will be walked over at some point in time to apply
	* the values to the registers that have matching rules.
	*/

	static bool has_samedia(const struct xe_device *xe)
	{
	return xe->info.media_verx100 >= 1300;
	}

	static bool rule_matches(const struct xe_device *xe,
	struct xe_gt *gt,
	struct xe_hw_engine *hwe,
	const struct xe_rtp_rule *rules,
	unsigned int n_rules)
	{
	const struct xe_rtp_rule *r;
	unsigned int i, rcount = 0;
	bool match;

	for (r = rules, i = 0; i < n_rules; r = &rules[++i]) {
	switch (r->match_type) {
	case XE_RTP_MATCH_OR:
	/*
	* This is only reached if a complete set of
	* rules passed or none were evaluated. For both cases,
	* shortcut the other rules and return the proper value.
	*/
	goto done;
	case XE_RTP_MATCH_PLATFORM:
	match = xe->info.platform == r->platform;
	break;
	case XE_RTP_MATCH_SUBPLATFORM:
	match = xe->info.platform == r->platform &&
	xe->info.subplatform == r->subplatform;
	break;
	case XE_RTP_MATCH_GRAPHICS_VERSION:
	match = xe->info.graphics_verx100 == r->ver_start &&
	(!has_samedia(xe) \|\| !xe_gt_is_media_type(gt));
	break;
	case XE_RTP_MATCH_GRAPHICS_VERSION_RANGE:
	match = xe->info.graphics_verx100 >= r->ver_start &&
	xe->info.graphics_verx100 <= r->ver_end &&
	(!has_samedia(xe) \|\| !xe_gt_is_media_type(gt));
	break;
	case XE_RTP_MATCH_GRAPHICS_VERSION_ANY_GT:
	match = xe->info.graphics_verx100 == r->ver_start;
	break;
	case XE_RTP_MATCH_GRAPHICS_STEP:
	match = xe->info.step.graphics >= r->step_start &&
	xe->info.step.graphics < r->step_end &&
	(!has_samedia(xe) \|\| !xe_gt_is_media_type(gt));
	break;
	case XE_RTP_MATCH_MEDIA_VERSION:
	match = xe->info.media_verx100 == r->ver_start &&
	(!has_samedia(xe) \|\| xe_gt_is_media_type(gt));
	break;
	case XE_RTP_MATCH_MEDIA_VERSION_RANGE:
	match = xe->info.media_verx100 >= r->ver_start &&
	xe->info.media_verx100 <= r->ver_end &&
	(!has_samedia(xe) \|\| xe_gt_is_media_type(gt));
	break;
	case XE_RTP_MATCH_MEDIA_STEP:
	match = xe->info.step.media >= r->step_start &&
	xe->info.step.media < r->step_end &&
	(!has_samedia(xe) \|\| xe_gt_is_media_type(gt));
	break;
	case XE_RTP_MATCH_MEDIA_VERSION_ANY_GT:
	match = xe->info.media_verx100 == r->ver_start;
	break;
	case XE_RTP_MATCH_INTEGRATED:
	match = !xe->info.is_dgfx;
	break;
	case XE_RTP_MATCH_DISCRETE:
	match = xe->info.is_dgfx;
	break;
	case XE_RTP_MATCH_ENGINE_CLASS:
	if (drm_WARN_ON(&xe->drm, !hwe))
	return false;

	match = hwe->class == r->engine_class;
	break;
	case XE_RTP_MATCH_NOT_ENGINE_CLASS:
	if (drm_WARN_ON(&xe->drm, !hwe))
	return false;

	match = hwe->class != r->engine_class;
	break;
	case XE_RTP_MATCH_FUNC:
	match = r->match_func(gt, hwe);
	break;
	default:
	drm_warn(&xe->drm, "Invalid RTP match %u\n",
	r->match_type);
	match = false;
	}

	if (!match) {
	/*
	* Advance rules until we find XE_RTP_MATCH_OR to check
	* if there's another set of conditions to check
	*/
	while (++i < n_rules && rules[i].match_type != XE_RTP_MATCH_OR)
	;

	if (i >= n_rules)
	return false;

	rcount = 0;
	} else {
	rcount++;
	}
	}

	done:
	if (drm_WARN_ON(&xe->drm, !rcount))
	return false;

	return true;
	}

	static void rtp_add_sr_entry(const struct xe_rtp_action *action,
	struct xe_gt *gt,
	u32 mmio_base,
	struct xe_reg_sr *sr)
	{
	struct xe_reg_sr_entry sr_entry = {
	.reg = action->reg,
	.clr_bits = action->clr_bits,
	.set_bits = action->set_bits,
	.read_mask = action->read_mask,
	};

	sr_entry.reg.addr += mmio_base;
	xe_reg_sr_add(sr, &sr_entry, gt);
	}

	static bool rtp_process_one_sr(const struct xe_rtp_entry_sr *entry,
	struct xe_device xe, struct xe_gt gt,
	struct xe_hw_engine hwe, struct xe_reg_sr sr)
	{
	const struct xe_rtp_action *action;
	u32 mmio_base;
	unsigned int i;

	if (!rule_matches(xe, gt, hwe, entry->rules, entry->n_rules))
	return false;

	for (i = 0, action = &entry->actions[0]; i < entry->n_actions; action++, i++) {
	if ((entry->flags & XE_RTP_ENTRY_FLAG_FOREACH_ENGINE) \|\|
	(action->flags & XE_RTP_ACTION_FLAG_ENGINE_BASE))
	mmio_base = hwe->mmio_base;
	else
	mmio_base = 0;

	rtp_add_sr_entry(action, gt, mmio_base, sr);
	}

	return true;
	}

	static void rtp_get_context(struct xe_rtp_process_ctx *ctx,
	struct xe_hw_engine **hwe,
	struct xe_gt **gt,
	struct xe_device **xe)
	{
	switch (ctx->type) {
	case XE_RTP_PROCESS_TYPE_GT:
	*hwe = NULL;
	*gt = ctx->gt;
	xe = gt_to_xe(gt);
	break;
	case XE_RTP_PROCESS_TYPE_ENGINE:
	*hwe = ctx->hwe;
	gt = (hwe)->gt;
	xe = gt_to_xe(gt);
	break;
	};
	}

	/**
	* xe_rtp_process_ctx_enable_active_tracking - Enable tracking of active entries
	*
	* Set additional metadata to track what entries are considered "active", i.e.
	* their rules match the condition. Bits are never cleared: entries with
	* matching rules set the corresponding bit in the bitmap.
	*
	* @ctx: The context for processing the table
	* @active_entries: bitmap to store the active entries
	* @n_entries: number of entries to be processed
	*/
	void xe_rtp_process_ctx_enable_active_tracking(struct xe_rtp_process_ctx *ctx,
	unsigned long *active_entries,
	size_t n_entries)
	{
	ctx->active_entries = active_entries;
	ctx->n_entries = n_entries;
	}

	static void rtp_mark_active(struct xe_device *xe,
	struct xe_rtp_process_ctx *ctx,
	unsigned int first, unsigned int last)
	{
	if (!ctx->active_entries)
	return;

	if (drm_WARN_ON(&xe->drm, last > ctx->n_entries))
	return;

	if (first == last)
	bitmap_set(ctx->active_entries, first, 1);
	else
	bitmap_set(ctx->active_entries, first, last - first + 1);
	}

	/**
	* xe_rtp_process_to_sr - Process all rtp @entries, adding the matching ones to
	* the save-restore argument.
	* @ctx: The context for processing the table, with one of device, gt or hwe
	* @entries: Table with RTP definitions
	* @sr: Save-restore struct where matching rules execute the action. This can be
	* viewed as the "coalesced view" of multiple the tables. The bits for each
	* register set are expected not to collide with previously added entries
	*
	* Walk the table pointed by @entries (with an empty sentinel) and add all
	* entries with matching rules to @sr. If @hwe is not NULL, its mmio_base is
	* used to calculate the right register offset
	*/
	void xe_rtp_process_to_sr(struct xe_rtp_process_ctx *ctx,
	const struct xe_rtp_entry_sr *entries,
	struct xe_reg_sr *sr)
	{
	const struct xe_rtp_entry_sr *entry;
	struct xe_hw_engine *hwe = NULL;
	struct xe_gt *gt = NULL;
	struct xe_device *xe = NULL;

	rtp_get_context(ctx, &hwe, &gt, &xe);

	if (IS_SRIOV_VF(xe))
	return;

	for (entry = entries; entry && entry->name; entry++) {
	bool match = false;

	if (entry->flags & XE_RTP_ENTRY_FLAG_FOREACH_ENGINE) {
	struct xe_hw_engine *each_hwe;
	enum xe_hw_engine_id id;

	for_each_hw_engine(each_hwe, gt, id)
	match \|= rtp_process_one_sr(entry, xe, gt,
	each_hwe, sr);
	} else {
	match = rtp_process_one_sr(entry, xe, gt, hwe, sr);
	}

	if (match)
	rtp_mark_active(xe, ctx, entry - entries,
	entry - entries);
	}
	}
	EXPORT_SYMBOL_IF_KUNIT(xe_rtp_process_to_sr);

	/**
	* xe_rtp_process - Process all rtp @entries, without running any action
	* @ctx: The context for processing the table, with one of device, gt or hwe
	* @entries: Table with RTP definitions
	*
	* Walk the table pointed by @entries (with an empty sentinel), executing the
	* rules. A few differences from xe_rtp_process_to_sr():
	*
	* 1. There is no action associated with each entry since this uses
	* struct xe_rtp_entry. Its main use is for marking active workarounds via
	* xe_rtp_process_ctx_enable_active_tracking().
	* 2. There is support for OR operations by having entries with no name.
	*/
	void xe_rtp_process(struct xe_rtp_process_ctx *ctx,
	const struct xe_rtp_entry *entries)
	{
	const struct xe_rtp_entry entry, first_entry;
	struct xe_hw_engine *hwe;
	struct xe_gt *gt;
	struct xe_device *xe;

	rtp_get_context(ctx, &hwe, &gt, &xe);

	first_entry = entries;
	if (drm_WARN_ON(&xe->drm, !first_entry->name))
	return;

	for (entry = entries; entry && entry->rules; entry++) {
	if (entry->name)
	first_entry = entry;

	if (!rule_matches(xe, gt, hwe, entry->rules, entry->n_rules))
	continue;

	/* Fast-forward entry, eliminating the OR'ed entries */
	for (entry++; entry && entry->rules; entry++)
	if (entry->name)
	break;
	entry--;

	rtp_mark_active(xe, ctx, first_entry - entries,
	entry - entries);
	}
	}

	bool xe_rtp_match_even_instance(const struct xe_gt *gt,
	const struct xe_hw_engine *hwe)
	{
	return hwe->instance % 2 == 0;
	}

	bool xe_rtp_match_first_render_or_compute(const struct xe_gt *gt,
	const struct xe_hw_engine *hwe)
	{
	u64 render_compute_mask = gt->info.engine_mask &
	(XE_HW_ENGINE_CCS_MASK \| XE_HW_ENGINE_RCS_MASK);

	return render_compute_mask &&
	hwe->engine_id == __ffs(render_compute_mask);
	}

	bool xe_rtp_match_first_gslice_fused_off(const struct xe_gt *gt,
	const struct xe_hw_engine *hwe)
	{
	unsigned int dss_per_gslice = 4;
	unsigned int dss;

	if (drm_WARN(&gt_to_xe(gt)->drm, xe_dss_mask_empty(gt->fuse_topo.g_dss_mask),
	"Checking gslice for platform without geometry pipeline\n"))
	return false;

	dss = xe_dss_mask_group_ffs(gt->fuse_topo.g_dss_mask, 0, 0);

	return dss >= dss_per_gslice;
	}