/**
* 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;
}
static void cache_setup_acpi_cpu(struct acpi_table_header *table,
unsigned int cpu)
{
struct acpi_pptt_cache *found_cache;
struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
u32 acpi_cpu_id = get_acpi_id_for_cpu(cpu);
struct cacheinfo *this_leaf;
unsigned int index = 0;
struct acpi_pptt_processor *cpu_node = NULL;
while (index < get_cpu_cacheinfo(cpu)->num_leaves) {
this_leaf = this_cpu_ci->info_list + index;
found_cache = acpi_find_cache_node(table, acpi_cpu_id,
this_leaf->type,
this_leaf->level,
&cpu_node);
pr_debug("found = %p %p\n", found_cache, cpu_node);
if (found_cache)
update_cache_properties(this_leaf,
found_cache,
cpu_node);
index++;
}
}
/**
* topology_get_acpi_cpu_tag() - Find a unique topology value for a feature
* @table: Pointer to the head of the PPTT table
* @cpu: Kernel logical CPU number
* @level: A level that terminates the search
* @flag: A flag which terminates the search
*
* Get a unique value given a CPU, and a topology level, that can be
* matched to determine which cpus share common topological features
* at that level.
*
* Return: Unique value, or -ENOENT if unable to locate CPU
*/
static int topology_get_acpi_cpu_tag(struct acpi_table_header *table,
unsigned int cpu, int level, int flag)
{
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 inline int get_cpu_for_acpi_id(u32 uid)
{
int cpu;
for (cpu = 0; cpu < nr_cpu_ids; cpu++)
if (uid == get_acpi_id_for_cpu(cpu))
return cpu;
return -EINVAL;
}
/**
* 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;
}
