1 // SPDX-License-Identifier: GPL-2.0
3  * pptt.c - parsing of Processor Properties Topology Table (PPTT)
33 	if (pptt_ref + sizeof(struct acpi_subtable_header) > table_hdr->length)  in fetch_pptt_subtable()
38 	if (entry->length == 0)  in fetch_pptt_subtable()
41 	if (pptt_ref + entry->length > table_hdr->length)  in fetch_pptt_subtable()
65 	if (resource >= node->number_of_priv_resources)  in acpi_get_pptt_resource()
81  * acpi_pptt_walk_cache() - Attempt to find the requested acpi_pptt_cache
109 	if (res->type != ACPI_PPTT_TYPE_CACHE)  in acpi_pptt_walk_cache()
117 		    cache->flags & ACPI_PPTT_CACHE_TYPE_VALID &&  in acpi_pptt_walk_cache()
118 		    acpi_pptt_match_type(cache->attributes, type)) {  in acpi_pptt_walk_cache()
130 		cache = fetch_pptt_cache(table_hdr, cache->next_level_of_cache);  in acpi_pptt_walk_cache()
168  * acpi_count_levels() - Given a PPTT table, and a CPU node, count the caches
187 		cpu_node = fetch_pptt_node(table_hdr, cpu_node->parent);  in acpi_count_levels()
194  * acpi_pptt_leaf_node() - Given a processor node, determine if its a leaf
213 	if (table_hdr->revision > 1)  in acpi_pptt_leaf_node()
214 		return (node->flags & ACPI_PPTT_ACPI_LEAF_NODE);  in acpi_pptt_leaf_node()
216 	table_end = (unsigned long)table_hdr + table_hdr->length;  in acpi_pptt_leaf_node()
224 		if (entry->type == ACPI_PPTT_TYPE_PROCESSOR &&  in acpi_pptt_leaf_node()
225 		    cpu_node->parent == node_entry)  in acpi_pptt_leaf_node()
227 		if (entry->length == 0)  in acpi_pptt_leaf_node()
230 				     entry->length);  in acpi_pptt_leaf_node()
237  * acpi_find_processor_node() - Given a PPTT table find the requested processor
258 	table_end = (unsigned long)table_hdr + table_hdr->length;  in acpi_find_processor_node()
267 		if (entry->length == 0) {  in acpi_find_processor_node()
271 		if (entry->type == ACPI_PPTT_TYPE_PROCESSOR &&  in acpi_find_processor_node()
272 		    acpi_cpu_id == cpu_node->acpi_processor_id &&  in acpi_find_processor_node()
278 				     entry->length);  in acpi_find_processor_node()
339 		cpu_node = fetch_pptt_node(table_hdr, cpu_node->parent);  in acpi_find_cache_node()
346  * update_cache_properties() - Update cacheinfo for the given processor
365 	this_leaf->fw_token = cpu_node;  in update_cache_properties()
366 	if (found_cache->flags & ACPI_PPTT_SIZE_PROPERTY_VALID)  in update_cache_properties()
367 		this_leaf->size = found_cache->size;  in update_cache_properties()
368 	if (found_cache->flags & ACPI_PPTT_LINE_SIZE_VALID)  in update_cache_properties()
369 		this_leaf->coherency_line_size = found_cache->line_size;  in update_cache_properties()
370 	if (found_cache->flags & ACPI_PPTT_NUMBER_OF_SETS_VALID)  in update_cache_properties()
371 		this_leaf->number_of_sets = found_cache->number_of_sets;  in update_cache_properties()
372 	if (found_cache->flags & ACPI_PPTT_ASSOCIATIVITY_VALID)  in update_cache_properties()
373 		this_leaf->ways_of_associativity = found_cache->associativity;  in update_cache_properties()
374 	if (found_cache->flags & ACPI_PPTT_WRITE_POLICY_VALID) {  in update_cache_properties()
375 		switch (found_cache->attributes & ACPI_PPTT_MASK_WRITE_POLICY) {  in update_cache_properties()
377 			this_leaf->attributes = CACHE_WRITE_THROUGH;  in update_cache_properties()
380 			this_leaf->attributes = CACHE_WRITE_BACK;  in update_cache_properties()
384 	if (found_cache->flags & ACPI_PPTT_ALLOCATION_TYPE_VALID) {  in update_cache_properties()
385 		switch (found_cache->attributes & ACPI_PPTT_MASK_ALLOCATION_TYPE) {  in update_cache_properties()
387 			this_leaf->attributes |= CACHE_READ_ALLOCATE;  in update_cache_properties()
390 			this_leaf->attributes |= CACHE_WRITE_ALLOCATE;  in update_cache_properties()
394 			this_leaf->attributes |=  in update_cache_properties()
409 	if (this_leaf->type == CACHE_TYPE_NOCACHE &&  in update_cache_properties()
410 	    found_cache->flags & ACPI_PPTT_CACHE_TYPE_VALID)  in update_cache_properties()
411 		this_leaf->type = CACHE_TYPE_UNIFIED;  in update_cache_properties()
413 	if (revision >= 3 && (found_cache->flags & ACPI_PPTT_CACHE_ID_VALID)) {  in update_cache_properties()
416 		this_leaf->id = found_cache_v1->cache_id;  in update_cache_properties()
417 		this_leaf->attributes |= CACHE_ID;  in update_cache_properties()
431 	while (index < get_cpu_cacheinfo(cpu)->num_leaves) {  in cache_setup_acpi_cpu()
432 		this_leaf = this_cpu_ci->info_list + index;  in cache_setup_acpi_cpu()
434 						   this_leaf->type,  in cache_setup_acpi_cpu()
435 						   this_leaf->level,  in cache_setup_acpi_cpu()
441 						table->revision);  in cache_setup_acpi_cpu()
453 	if (table_hdr->revision < 2)  in flag_identical()
457 	if (cpu->flags & ACPI_PPTT_ACPI_IDENTICAL) {  in flag_identical()
458 		next = fetch_pptt_node(table_hdr, cpu->parent);  in flag_identical()
459 		if (!(next && next->flags & ACPI_PPTT_ACPI_IDENTICAL))  in flag_identical()
480 		} else if (cpu->flags & flag)  in acpi_find_processor_tag()
483 		prev_node = fetch_pptt_node(table_hdr, cpu->parent);  in acpi_find_processor_tag()
487 		level--;  in acpi_find_processor_tag()
498  * topology_get_acpi_cpu_tag() - Find a unique topology value for a feature
508  * Return: Unique value, or -ENOENT if unable to locate CPU
527 		    cpu_node->flags & ACPI_PPTT_ACPI_PROCESSOR_ID_VALID)  in topology_get_acpi_cpu_tag()
528 			return cpu_node->acpi_processor_id;  in topology_get_acpi_cpu_tag()
533 	return -ENOENT;  in topology_get_acpi_cpu_tag()
562 		return -ENOENT;  in find_acpi_cpu_topology_tag()
572  * check_acpi_cpu_flag() - Determine if CPU node has a flag set
579  * Return: -ENOENT if the PPTT doesn't exist, the CPU cannot be found or
589 	int ret = -ENOENT;  in check_acpi_cpu_flag()
593 		return -ENOENT;  in check_acpi_cpu_flag()
595 	if (table->revision >= rev)  in check_acpi_cpu_flag()
599 		ret = (cpu_node->flags & flag) != 0;  in check_acpi_cpu_flag()
605  * acpi_find_last_cache_level() - Determines the number of cache levels for a PE
622 		return -ENOENT;  in acpi_find_last_cache_level()
634  * cache_setup_acpi() - Override CPU cache topology with data from the PPTT
644  * Return: -ENOENT on failure to find table, or 0 on success
652 		return -ENOENT;  in cache_setup_acpi()
662  * acpi_pptt_cpu_is_thread() - Determine if CPU is a thread
667  *         -ENOENT ,if the PPTT doesn't exist, the CPU cannot be found or
676  * find_acpi_cpu_topology() - Determine a unique topology value for a given CPU
680  * Determine a topology unique ID for each thread/core/cluster/mc_grouping
690  * Return: -ENOENT if the PPTT doesn't exist, or the CPU cannot be found.
699  * find_acpi_cpu_topology_package() - Determine a unique CPU package value
708  * Return: -ENOENT if the PPTT doesn't exist, or the CPU cannot be found.
718  * find_acpi_cpu_topology_cluster() - Determine a unique CPU cluster value
721  * Determine a topology unique cluster ID for the given CPU/thread.
724  * The cluster, if present is the level of topology above CPUs. In a
725  * multi-thread CPU, it will be the level above the CPU, not the thread.
726  * It may not exist in single CPU systems. In simple multi-CPU systems,
729  * Return: -ENOENT if the PPTT doesn't exist, the CPU cannot be found
744 		return -ENOENT;  in find_acpi_cpu_topology_cluster()
748 	if (!cpu_node || !cpu_node->parent)  in find_acpi_cpu_topology_cluster()
749 		return -ENOENT;  in find_acpi_cpu_topology_cluster()
751 	is_thread = cpu_node->flags & ACPI_PPTT_ACPI_PROCESSOR_IS_THREAD;  in find_acpi_cpu_topology_cluster()
752 	cluster_node = fetch_pptt_node(table, cpu_node->parent);  in find_acpi_cpu_topology_cluster()
754 		return -ENOENT;  in find_acpi_cpu_topology_cluster()
757 		if (!cluster_node->parent)  in find_acpi_cpu_topology_cluster()
758 			return -ENOENT;  in find_acpi_cpu_topology_cluster()
760 		cluster_node = fetch_pptt_node(table, cluster_node->parent);  in find_acpi_cpu_topology_cluster()
762 			return -ENOENT;  in find_acpi_cpu_topology_cluster()
764 	if (cluster_node->flags & ACPI_PPTT_ACPI_PROCESSOR_ID_VALID)  in find_acpi_cpu_topology_cluster()
765 		retval = cluster_node->acpi_processor_id;  in find_acpi_cpu_topology_cluster()
773  * find_acpi_cpu_topology_hetero_id() - Get a core architecture tag
788  * Return: -ENOENT if the PPTT doesn't exist, or the CPU cannot be found.