![Bjorn Helgaas](/assets/img/avatar_default.png)
Fix some misspellings in comments. No functional change intended. Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
663 lines
20 KiB
C
663 lines
20 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* pptt.c - parsing of Processor Properties Topology Table (PPTT)
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*
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* Copyright (C) 2018, ARM
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*
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* This file implements parsing of the Processor Properties Topology Table
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* which is optionally used to describe the processor and cache topology.
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* Due to the relative pointers used throughout the table, this doesn't
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* leverage the existing subtable parsing in the kernel.
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*
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* The PPTT structure is an inverted tree, with each node potentially
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* holding one or two inverted tree data structures describing
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* the caches available at that level. Each cache structure optionally
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* contains properties describing the cache at a given level which can be
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* used to override hardware probed values.
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*/
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#define pr_fmt(fmt) "ACPI PPTT: " fmt
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#include <linux/acpi.h>
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#include <linux/cacheinfo.h>
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#include <acpi/processor.h>
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static struct acpi_subtable_header *fetch_pptt_subtable(struct acpi_table_header *table_hdr,
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u32 pptt_ref)
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{
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struct acpi_subtable_header *entry;
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/* there isn't a subtable at reference 0 */
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if (pptt_ref < sizeof(struct acpi_subtable_header))
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return NULL;
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if (pptt_ref + sizeof(struct acpi_subtable_header) > table_hdr->length)
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return NULL;
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entry = ACPI_ADD_PTR(struct acpi_subtable_header, table_hdr, pptt_ref);
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if (entry->length == 0)
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return NULL;
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if (pptt_ref + entry->length > table_hdr->length)
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return NULL;
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return entry;
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}
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static struct acpi_pptt_processor *fetch_pptt_node(struct acpi_table_header *table_hdr,
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u32 pptt_ref)
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{
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return (struct acpi_pptt_processor *)fetch_pptt_subtable(table_hdr, pptt_ref);
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}
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static struct acpi_pptt_cache *fetch_pptt_cache(struct acpi_table_header *table_hdr,
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u32 pptt_ref)
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{
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return (struct acpi_pptt_cache *)fetch_pptt_subtable(table_hdr, pptt_ref);
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}
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static struct acpi_subtable_header *acpi_get_pptt_resource(struct acpi_table_header *table_hdr,
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struct acpi_pptt_processor *node,
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int resource)
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{
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u32 *ref;
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if (resource >= node->number_of_priv_resources)
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return NULL;
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ref = ACPI_ADD_PTR(u32, node, sizeof(struct acpi_pptt_processor));
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ref += resource;
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return fetch_pptt_subtable(table_hdr, *ref);
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}
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static inline bool acpi_pptt_match_type(int table_type, int type)
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{
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return ((table_type & ACPI_PPTT_MASK_CACHE_TYPE) == type ||
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table_type & ACPI_PPTT_CACHE_TYPE_UNIFIED & type);
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}
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/**
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* acpi_pptt_walk_cache() - Attempt to find the requested acpi_pptt_cache
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* @table_hdr: Pointer to the head of the PPTT table
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* @local_level: passed res reflects this cache level
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* @res: cache resource in the PPTT we want to walk
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* @found: returns a pointer to the requested level if found
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* @level: the requested cache level
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* @type: the requested cache type
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*
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* Attempt to find a given cache level, while counting the max number
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* of cache levels for the cache node.
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*
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* Given a pptt resource, verify that it is a cache node, then walk
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* down each level of caches, counting how many levels are found
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* as well as checking the cache type (icache, dcache, unified). If a
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* level & type match, then we set found, and continue the search.
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* Once the entire cache branch has been walked return its max
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* depth.
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*
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* Return: The cache structure and the level we terminated with.
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*/
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static int acpi_pptt_walk_cache(struct acpi_table_header *table_hdr,
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int local_level,
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struct acpi_subtable_header *res,
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struct acpi_pptt_cache **found,
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int level, int type)
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{
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struct acpi_pptt_cache *cache;
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if (res->type != ACPI_PPTT_TYPE_CACHE)
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return 0;
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cache = (struct acpi_pptt_cache *) res;
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while (cache) {
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local_level++;
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if (local_level == level &&
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cache->flags & ACPI_PPTT_CACHE_TYPE_VALID &&
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acpi_pptt_match_type(cache->attributes, type)) {
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if (*found != NULL && cache != *found)
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pr_warn("Found duplicate cache level/type unable to determine uniqueness\n");
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pr_debug("Found cache @ level %d\n", level);
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*found = cache;
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/*
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* continue looking at this node's resource list
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* to verify that we don't find a duplicate
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* cache node.
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*/
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}
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cache = fetch_pptt_cache(table_hdr, cache->next_level_of_cache);
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}
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return local_level;
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}
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static struct acpi_pptt_cache *acpi_find_cache_level(struct acpi_table_header *table_hdr,
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struct acpi_pptt_processor *cpu_node,
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int *starting_level, int level,
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int type)
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{
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struct acpi_subtable_header *res;
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int number_of_levels = *starting_level;
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int resource = 0;
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struct acpi_pptt_cache *ret = NULL;
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int local_level;
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/* walk down from processor node */
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while ((res = acpi_get_pptt_resource(table_hdr, cpu_node, resource))) {
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resource++;
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local_level = acpi_pptt_walk_cache(table_hdr, *starting_level,
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res, &ret, level, type);
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/*
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* we are looking for the max depth. Since its potentially
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* possible for a given node to have resources with differing
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* depths verify that the depth we have found is the largest.
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*/
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if (number_of_levels < local_level)
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number_of_levels = local_level;
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}
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if (number_of_levels > *starting_level)
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*starting_level = number_of_levels;
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return ret;
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}
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/**
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* acpi_count_levels() - Given a PPTT table, and a CPU node, count the caches
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* @table_hdr: Pointer to the head of the PPTT table
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* @cpu_node: processor node we wish to count caches for
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*
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* Given a processor node containing a processing unit, walk into it and count
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* how many levels exist solely for it, and then walk up each level until we hit
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* the root node (ignore the package level because it may be possible to have
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* caches that exist across packages). Count the number of cache levels that
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* exist at each level on the way up.
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*
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* Return: Total number of levels found.
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*/
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static int acpi_count_levels(struct acpi_table_header *table_hdr,
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struct acpi_pptt_processor *cpu_node)
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{
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int total_levels = 0;
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do {
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acpi_find_cache_level(table_hdr, cpu_node, &total_levels, 0, 0);
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cpu_node = fetch_pptt_node(table_hdr, cpu_node->parent);
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} while (cpu_node);
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return total_levels;
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}
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/**
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* acpi_pptt_leaf_node() - Given a processor node, determine if its a leaf
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* @table_hdr: Pointer to the head of the PPTT table
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* @node: passed node is checked to see if its a leaf
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*
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* Determine if the *node parameter is a leaf node by iterating the
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* PPTT table, looking for nodes which reference it.
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*
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* Return: 0 if we find a node referencing the passed node (or table error),
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* or 1 if we don't.
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*/
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static int acpi_pptt_leaf_node(struct acpi_table_header *table_hdr,
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struct acpi_pptt_processor *node)
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{
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struct acpi_subtable_header *entry;
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unsigned long table_end;
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u32 node_entry;
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struct acpi_pptt_processor *cpu_node;
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u32 proc_sz;
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if (table_hdr->revision > 1)
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return (node->flags & ACPI_PPTT_ACPI_LEAF_NODE);
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table_end = (unsigned long)table_hdr + table_hdr->length;
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node_entry = ACPI_PTR_DIFF(node, table_hdr);
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entry = ACPI_ADD_PTR(struct acpi_subtable_header, table_hdr,
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sizeof(struct acpi_table_pptt));
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proc_sz = sizeof(struct acpi_pptt_processor *);
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while ((unsigned long)entry + proc_sz < table_end) {
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cpu_node = (struct acpi_pptt_processor *)entry;
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if (entry->type == ACPI_PPTT_TYPE_PROCESSOR &&
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cpu_node->parent == node_entry)
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return 0;
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if (entry->length == 0)
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return 0;
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entry = ACPI_ADD_PTR(struct acpi_subtable_header, entry,
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entry->length);
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}
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return 1;
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}
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/**
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* acpi_find_processor_node() - Given a PPTT table find the requested processor
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* @table_hdr: Pointer to the head of the PPTT table
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* @acpi_cpu_id: CPU we are searching for
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*
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* Find the subtable entry describing the provided processor.
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* This is done by iterating the PPTT table looking for processor nodes
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* which have an acpi_processor_id that matches the acpi_cpu_id parameter
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* passed into the function. If we find a node that matches this criteria
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* we verify that its a leaf node in the topology rather than depending
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* on the valid flag, which doesn't need to be set for leaf nodes.
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*
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* Return: NULL, or the processors acpi_pptt_processor*
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*/
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static struct acpi_pptt_processor *acpi_find_processor_node(struct acpi_table_header *table_hdr,
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u32 acpi_cpu_id)
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{
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struct acpi_subtable_header *entry;
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unsigned long table_end;
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struct acpi_pptt_processor *cpu_node;
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u32 proc_sz;
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table_end = (unsigned long)table_hdr + table_hdr->length;
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entry = ACPI_ADD_PTR(struct acpi_subtable_header, table_hdr,
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sizeof(struct acpi_table_pptt));
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proc_sz = sizeof(struct acpi_pptt_processor *);
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/* find the processor structure associated with this cpuid */
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while ((unsigned long)entry + proc_sz < table_end) {
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cpu_node = (struct acpi_pptt_processor *)entry;
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if (entry->length == 0) {
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pr_warn("Invalid zero length subtable\n");
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break;
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}
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if (entry->type == ACPI_PPTT_TYPE_PROCESSOR &&
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acpi_cpu_id == cpu_node->acpi_processor_id &&
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acpi_pptt_leaf_node(table_hdr, cpu_node)) {
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return (struct acpi_pptt_processor *)entry;
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}
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entry = ACPI_ADD_PTR(struct acpi_subtable_header, entry,
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entry->length);
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}
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return NULL;
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}
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static int acpi_find_cache_levels(struct acpi_table_header *table_hdr,
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u32 acpi_cpu_id)
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{
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int number_of_levels = 0;
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struct acpi_pptt_processor *cpu;
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cpu = acpi_find_processor_node(table_hdr, acpi_cpu_id);
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if (cpu)
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number_of_levels = acpi_count_levels(table_hdr, cpu);
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return number_of_levels;
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}
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static u8 acpi_cache_type(enum cache_type type)
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{
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switch (type) {
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case CACHE_TYPE_DATA:
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pr_debug("Looking for data cache\n");
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return ACPI_PPTT_CACHE_TYPE_DATA;
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case CACHE_TYPE_INST:
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pr_debug("Looking for instruction cache\n");
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return ACPI_PPTT_CACHE_TYPE_INSTR;
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default:
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case CACHE_TYPE_UNIFIED:
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pr_debug("Looking for unified cache\n");
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/*
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* It is important that ACPI_PPTT_CACHE_TYPE_UNIFIED
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* contains the bit pattern that will match both
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* ACPI unified bit patterns because we use it later
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* to match both cases.
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*/
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return ACPI_PPTT_CACHE_TYPE_UNIFIED;
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}
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}
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static struct acpi_pptt_cache *acpi_find_cache_node(struct acpi_table_header *table_hdr,
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u32 acpi_cpu_id,
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enum cache_type type,
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unsigned int level,
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struct acpi_pptt_processor **node)
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{
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int total_levels = 0;
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struct acpi_pptt_cache *found = NULL;
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struct acpi_pptt_processor *cpu_node;
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u8 acpi_type = acpi_cache_type(type);
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pr_debug("Looking for CPU %d's level %d cache type %d\n",
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acpi_cpu_id, level, acpi_type);
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cpu_node = acpi_find_processor_node(table_hdr, acpi_cpu_id);
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while (cpu_node && !found) {
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found = acpi_find_cache_level(table_hdr, cpu_node,
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&total_levels, level, acpi_type);
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*node = cpu_node;
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cpu_node = fetch_pptt_node(table_hdr, cpu_node->parent);
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}
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return found;
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}
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/**
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* update_cache_properties() - Update cacheinfo for the given processor
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* @this_leaf: Kernel cache info structure being updated
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* @found_cache: The PPTT node describing this cache instance
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* @cpu_node: A unique reference to describe this cache instance
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*
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* The ACPI spec implies that the fields in the cache structures are used to
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* extend and correct the information probed from the hardware. Lets only
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* set fields that we determine are VALID.
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*
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* Return: nothing. Side effect of updating the global cacheinfo
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*/
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static void update_cache_properties(struct cacheinfo *this_leaf,
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struct acpi_pptt_cache *found_cache,
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struct acpi_pptt_processor *cpu_node)
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{
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this_leaf->fw_token = cpu_node;
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if (found_cache->flags & ACPI_PPTT_SIZE_PROPERTY_VALID)
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this_leaf->size = found_cache->size;
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if (found_cache->flags & ACPI_PPTT_LINE_SIZE_VALID)
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this_leaf->coherency_line_size = found_cache->line_size;
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if (found_cache->flags & ACPI_PPTT_NUMBER_OF_SETS_VALID)
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this_leaf->number_of_sets = found_cache->number_of_sets;
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if (found_cache->flags & ACPI_PPTT_ASSOCIATIVITY_VALID)
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this_leaf->ways_of_associativity = found_cache->associativity;
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if (found_cache->flags & ACPI_PPTT_WRITE_POLICY_VALID) {
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switch (found_cache->attributes & ACPI_PPTT_MASK_WRITE_POLICY) {
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case ACPI_PPTT_CACHE_POLICY_WT:
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this_leaf->attributes = CACHE_WRITE_THROUGH;
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break;
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case ACPI_PPTT_CACHE_POLICY_WB:
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this_leaf->attributes = CACHE_WRITE_BACK;
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break;
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}
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}
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if (found_cache->flags & ACPI_PPTT_ALLOCATION_TYPE_VALID) {
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switch (found_cache->attributes & ACPI_PPTT_MASK_ALLOCATION_TYPE) {
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case ACPI_PPTT_CACHE_READ_ALLOCATE:
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this_leaf->attributes |= CACHE_READ_ALLOCATE;
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break;
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case ACPI_PPTT_CACHE_WRITE_ALLOCATE:
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this_leaf->attributes |= CACHE_WRITE_ALLOCATE;
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break;
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case ACPI_PPTT_CACHE_RW_ALLOCATE:
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case ACPI_PPTT_CACHE_RW_ALLOCATE_ALT:
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this_leaf->attributes |=
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CACHE_READ_ALLOCATE | CACHE_WRITE_ALLOCATE;
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break;
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}
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}
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/*
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* If cache type is NOCACHE, then the cache hasn't been specified
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* via other mechanisms. Update the type if a cache type has been
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* provided.
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*
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* Note, we assume such caches are unified based on conventional system
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* design and known examples. Significant work is required elsewhere to
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* fully support data/instruction only type caches which are only
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* specified in PPTT.
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*/
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if (this_leaf->type == CACHE_TYPE_NOCACHE &&
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found_cache->flags & ACPI_PPTT_CACHE_TYPE_VALID)
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this_leaf->type = CACHE_TYPE_UNIFIED;
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}
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static void cache_setup_acpi_cpu(struct acpi_table_header *table,
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unsigned int cpu)
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{
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struct acpi_pptt_cache *found_cache;
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struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
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u32 acpi_cpu_id = get_acpi_id_for_cpu(cpu);
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struct cacheinfo *this_leaf;
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unsigned int index = 0;
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struct acpi_pptt_processor *cpu_node = NULL;
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while (index < get_cpu_cacheinfo(cpu)->num_leaves) {
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this_leaf = this_cpu_ci->info_list + index;
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found_cache = acpi_find_cache_node(table, acpi_cpu_id,
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this_leaf->type,
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this_leaf->level,
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&cpu_node);
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pr_debug("found = %p %p\n", found_cache, cpu_node);
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if (found_cache)
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update_cache_properties(this_leaf,
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found_cache,
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cpu_node);
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index++;
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}
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}
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/* Passing level values greater than this will result in search termination */
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#define PPTT_ABORT_PACKAGE 0xFF
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static struct acpi_pptt_processor *acpi_find_processor_package_id(struct acpi_table_header *table_hdr,
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struct acpi_pptt_processor *cpu,
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int level, int flag)
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{
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struct acpi_pptt_processor *prev_node;
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while (cpu && level) {
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if (cpu->flags & flag)
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break;
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pr_debug("level %d\n", level);
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prev_node = fetch_pptt_node(table_hdr, cpu->parent);
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if (prev_node == NULL)
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break;
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cpu = prev_node;
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level--;
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}
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return cpu;
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}
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static void acpi_pptt_warn_missing(void)
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{
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pr_warn_once("No PPTT table found, CPU and cache topology may be inaccurate\n");
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}
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/**
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* topology_get_acpi_cpu_tag() - Find a unique topology value for a feature
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* @table: Pointer to the head of the PPTT table
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* @cpu: Kernel logical CPU number
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* @level: A level that terminates the search
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* @flag: A flag which terminates the search
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*
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* Get a unique value given a CPU, and a topology level, that can be
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* matched to determine which cpus share common topological features
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* at that level.
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*
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* Return: Unique value, or -ENOENT if unable to locate CPU
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*/
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static int topology_get_acpi_cpu_tag(struct acpi_table_header *table,
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unsigned int cpu, int level, int flag)
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{
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struct acpi_pptt_processor *cpu_node;
|
|
u32 acpi_cpu_id = get_acpi_id_for_cpu(cpu);
|
|
|
|
cpu_node = acpi_find_processor_node(table, acpi_cpu_id);
|
|
if (cpu_node) {
|
|
cpu_node = acpi_find_processor_package_id(table, cpu_node,
|
|
level, flag);
|
|
/*
|
|
* As per specification if the processor structure represents
|
|
* an actual processor, then ACPI processor ID must be valid.
|
|
* For processor containers ACPI_PPTT_ACPI_PROCESSOR_ID_VALID
|
|
* should be set if the UID is valid
|
|
*/
|
|
if (level == 0 ||
|
|
cpu_node->flags & ACPI_PPTT_ACPI_PROCESSOR_ID_VALID)
|
|
return cpu_node->acpi_processor_id;
|
|
return ACPI_PTR_DIFF(cpu_node, table);
|
|
}
|
|
pr_warn_once("PPTT table found, but unable to locate core %d (%d)\n",
|
|
cpu, acpi_cpu_id);
|
|
return -ENOENT;
|
|
}
|
|
|
|
static int find_acpi_cpu_topology_tag(unsigned int cpu, int level, int flag)
|
|
{
|
|
struct acpi_table_header *table;
|
|
acpi_status status;
|
|
int retval;
|
|
|
|
status = acpi_get_table(ACPI_SIG_PPTT, 0, &table);
|
|
if (ACPI_FAILURE(status)) {
|
|
acpi_pptt_warn_missing();
|
|
return -ENOENT;
|
|
}
|
|
retval = topology_get_acpi_cpu_tag(table, cpu, level, flag);
|
|
pr_debug("Topology Setup ACPI CPU %d, level %d ret = %d\n",
|
|
cpu, level, retval);
|
|
acpi_put_table(table);
|
|
|
|
return retval;
|
|
}
|
|
|
|
/**
|
|
* acpi_find_last_cache_level() - Determines the number of cache levels for a PE
|
|
* @cpu: Kernel logical CPU number
|
|
*
|
|
* Given a logical CPU number, returns the number of levels of cache represented
|
|
* in the PPTT. Errors caused by lack of a PPTT table, or otherwise, return 0
|
|
* indicating we didn't find any cache levels.
|
|
*
|
|
* Return: Cache levels visible to this core.
|
|
*/
|
|
int acpi_find_last_cache_level(unsigned int cpu)
|
|
{
|
|
u32 acpi_cpu_id;
|
|
struct acpi_table_header *table;
|
|
int number_of_levels = 0;
|
|
acpi_status status;
|
|
|
|
pr_debug("Cache Setup find last level CPU=%d\n", cpu);
|
|
|
|
acpi_cpu_id = get_acpi_id_for_cpu(cpu);
|
|
status = acpi_get_table(ACPI_SIG_PPTT, 0, &table);
|
|
if (ACPI_FAILURE(status)) {
|
|
acpi_pptt_warn_missing();
|
|
} else {
|
|
number_of_levels = acpi_find_cache_levels(table, acpi_cpu_id);
|
|
acpi_put_table(table);
|
|
}
|
|
pr_debug("Cache Setup find last level level=%d\n", number_of_levels);
|
|
|
|
return number_of_levels;
|
|
}
|
|
|
|
/**
|
|
* cache_setup_acpi() - Override CPU cache topology with data from the PPTT
|
|
* @cpu: Kernel logical CPU number
|
|
*
|
|
* Updates the global cache info provided by cpu_get_cacheinfo()
|
|
* when there are valid properties in the acpi_pptt_cache nodes. A
|
|
* successful parse may not result in any updates if none of the
|
|
* cache levels have any valid flags set. Further, a unique value is
|
|
* associated with each known CPU cache entry. This unique value
|
|
* can be used to determine whether caches are shared between CPUs.
|
|
*
|
|
* Return: -ENOENT on failure to find table, or 0 on success
|
|
*/
|
|
int cache_setup_acpi(unsigned int cpu)
|
|
{
|
|
struct acpi_table_header *table;
|
|
acpi_status status;
|
|
|
|
pr_debug("Cache Setup ACPI CPU %d\n", cpu);
|
|
|
|
status = acpi_get_table(ACPI_SIG_PPTT, 0, &table);
|
|
if (ACPI_FAILURE(status)) {
|
|
acpi_pptt_warn_missing();
|
|
return -ENOENT;
|
|
}
|
|
|
|
cache_setup_acpi_cpu(table, cpu);
|
|
acpi_put_table(table);
|
|
|
|
return status;
|
|
}
|
|
|
|
/**
|
|
* find_acpi_cpu_topology() - Determine a unique topology value for a given CPU
|
|
* @cpu: Kernel logical CPU number
|
|
* @level: The topological level for which we would like a unique ID
|
|
*
|
|
* Determine a topology unique ID for each thread/core/cluster/mc_grouping
|
|
* /socket/etc. This ID can then be used to group peers, which will have
|
|
* matching ids.
|
|
*
|
|
* The search terminates when either the requested level is found or
|
|
* we reach a root node. Levels beyond the termination point will return the
|
|
* same unique ID. The unique id for level 0 is the acpi processor id. All
|
|
* other levels beyond this use a generated value to uniquely identify
|
|
* a topological feature.
|
|
*
|
|
* Return: -ENOENT if the PPTT doesn't exist, or the CPU cannot be found.
|
|
* Otherwise returns a value which represents a unique topological feature.
|
|
*/
|
|
int find_acpi_cpu_topology(unsigned int cpu, int level)
|
|
{
|
|
return find_acpi_cpu_topology_tag(cpu, level, 0);
|
|
}
|
|
|
|
/**
|
|
* find_acpi_cpu_cache_topology() - Determine a unique cache topology value
|
|
* @cpu: Kernel logical CPU number
|
|
* @level: The cache level for which we would like a unique ID
|
|
*
|
|
* Determine a unique ID for each unified cache in the system
|
|
*
|
|
* Return: -ENOENT if the PPTT doesn't exist, or the CPU cannot be found.
|
|
* Otherwise returns a value which represents a unique topological feature.
|
|
*/
|
|
int find_acpi_cpu_cache_topology(unsigned int cpu, int level)
|
|
{
|
|
struct acpi_table_header *table;
|
|
struct acpi_pptt_cache *found_cache;
|
|
acpi_status status;
|
|
u32 acpi_cpu_id = get_acpi_id_for_cpu(cpu);
|
|
struct acpi_pptt_processor *cpu_node = NULL;
|
|
int ret = -1;
|
|
|
|
status = acpi_get_table(ACPI_SIG_PPTT, 0, &table);
|
|
if (ACPI_FAILURE(status)) {
|
|
acpi_pptt_warn_missing();
|
|
return -ENOENT;
|
|
}
|
|
|
|
found_cache = acpi_find_cache_node(table, acpi_cpu_id,
|
|
CACHE_TYPE_UNIFIED,
|
|
level,
|
|
&cpu_node);
|
|
if (found_cache)
|
|
ret = ACPI_PTR_DIFF(cpu_node, table);
|
|
|
|
acpi_put_table(table);
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
/**
|
|
* find_acpi_cpu_topology_package() - Determine a unique CPU package value
|
|
* @cpu: Kernel logical CPU number
|
|
*
|
|
* Determine a topology unique package ID for the given CPU.
|
|
* This ID can then be used to group peers, which will have matching ids.
|
|
*
|
|
* The search terminates when either a level is found with the PHYSICAL_PACKAGE
|
|
* flag set or we reach a root node.
|
|
*
|
|
* Return: -ENOENT if the PPTT doesn't exist, or the CPU cannot be found.
|
|
* Otherwise returns a value which represents the package for this CPU.
|
|
*/
|
|
int find_acpi_cpu_topology_package(unsigned int cpu)
|
|
{
|
|
return find_acpi_cpu_topology_tag(cpu, PPTT_ABORT_PACKAGE,
|
|
ACPI_PPTT_PHYSICAL_PACKAGE);
|
|
}
|