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/* SPDX-License-Identifier: GPL-2.0-only */
#include <acpi/acpi.h>
#include <include/assert.h>
#include <console/console.h>
/*
* A structure to hold a cache pointer
* and its corresponding reference within
* the PPTT table.
*/
struct cache_reference {
struct pptt_cache *cache; // cache pointer
u32 ref; // and its reference within PPTT
};
/*
* A list of 'struct cache_reference', used
* to keep track of generated caches per topology level.
*/
struct cache_list {
u32 n_caches; // number of caches in list
struct cache_reference cache_refs[CONFIG_ACPI_PPTT_MAX_CACHES]; // cache reference list
};
/*
* Start of the PPTT table. Constant
* value as soon as we enter acpi_create_pptt_body.
*/
static uintptr_t pptt_start;
/* --- Helper Functions (non exposed) --- */
static inline u32 node_to_reference(const void *node)
{
/*
* References are the offset from the start
* of the PPTT table.
*
* PPTT
* +---------+ <- pptt_start (acpi_pptt_t) <---+
* | | | node - pptt_start
* | | |
* +---------+ <- node (cpu or cache) <--------+
* | |
* | |
* | |
* +---------+
*/
return ((uintptr_t)node - pptt_start);
}
static u32 count_resources(struct pptt_cpu_resources *res)
{
u32 n_resources = 0;
while (res != NULL) {
n_resources += 1;
res = res->next;
}
return n_resources;
}
static u32 cache_list_ref_of(struct cache_list *cache_list, const struct pptt_cache *cache)
{
/*
* Lookup the PPTT reference of 'cache'.
* Return 0, if no PPTT structure exists for 'cache'.
*/
for (int i = 0; i < cache_list->n_caches; i++) {
if (cache_list->cache_refs[i].cache == cache)
return cache_list->cache_refs[i].ref;
}
/* no cache reference found */
return 0;
}
static inline void cache_list_append(struct cache_list *cache_list, struct pptt_cache *cache, const u32 ref)
{
printk(BIOS_DEBUG, "acpi: pptt: cache=%p ref=%u\n", cache, ref);
cache_list->cache_refs[cache_list->n_caches].cache = cache;
cache_list->cache_refs[cache_list->n_caches].ref = ref;
cache_list->n_caches += 1;
}
static u32 new_pptt_cache(unsigned long *current, struct pptt_cache *cache, struct cache_list *cache_list)
{
static u32 unique_cache_id = 1;
u32 current_reference = 0;
if ((current_reference = cache_list_ref_of(cache_list, cache)) != 0)
return current_reference;
if (cache_list->n_caches >= CONFIG_ACPI_PPTT_MAX_CACHES) {
printk(BIOS_WARNING, "acpi: pptt: Too many distinct caches! PPTT incomplete.\n");
return 0;
}
acpi_pptt_cache_node_t *cache_node = (acpi_pptt_cache_node_t *)*current;
memset(cache_node, 0x0, sizeof(acpi_pptt_cache_node_t));
cache_node->type = PPTT_NODE_TYPE_CACHE;
cache_node->length = sizeof(acpi_pptt_cache_node_t);
cache_node->flags = cache->flags.raw;
cache_node->size = cache->size;
cache_node->n_sets = cache->numsets;
cache_node->associativity = cache->associativity;
cache_node->attributes = cache->attributes;
cache_node->line_size = cache->line_size;
cache_node->cache_id = unique_cache_id++;
*current += cache_node->length;
current_reference = node_to_reference(cache_node);
cache_list_append(cache_list, cache, current_reference);
if (cache->next_level != NULL)
cache_node->next_level = new_pptt_cache(current, cache->next_level, cache_list);
return current_reference;
}
static u32 new_pptt_cpu(unsigned long *current, const struct pptt_topology *cpu, const u32 parent_ref, struct cache_list *cache_list)
{
acpi_pptt_cpu_node_t *cpu_node = (acpi_pptt_cpu_node_t *)*current;
const u32 n_resources = count_resources(cpu->resources);
const u32 structure_length = sizeof(acpi_pptt_cpu_node_t) + (n_resources * sizeof(u32));
memset(cpu_node, 0x0, structure_length);
cpu_node->type = PPTT_NODE_TYPE_CPU;
cpu_node->length = structure_length;
cpu_node->flags = cpu->flags.raw;
cpu_node->processor_id = cpu->processor_id;
cpu_node->parent = parent_ref;
*current += cpu_node->length;
for (struct pptt_cpu_resources *it = cpu->resources; it != NULL; it = it->next)
cpu_node->resources[cpu_node->n_resources++] = new_pptt_cache(current, it->cache, cache_list);
return node_to_reference(cpu_node);
}
static void setup_topology(const struct pptt_topology *node, const u32 parent_ref, unsigned long *current)
{
struct cache_list cache_list = {
.cache_refs = { },
.n_caches = 0
};
while (node != NULL) {
const u32 cpu_ref = new_pptt_cpu(current, node, parent_ref, &cache_list);
setup_topology(node->child, cpu_ref, current);
node = node->sibling;
}
}
/* --- PPTT generation helper functions (exposed) --- */
void acpi_create_pptt_body(acpi_pptt_t *pptt)
{
/* set start of pptt table */
pptt_start = (uintptr_t)pptt;
/* locate start of pptt body */
unsigned long current = (unsigned long)(pptt->body);
/* retrieve processor topology */
const struct pptt_topology *topology_tree = acpi_get_pptt_topology();
/* write processor properties topology table to memory */
setup_topology(topology_tree, 0, ¤t);
/* update length field in pptt header */
pptt->header.length = current - (unsigned long)pptt;
}
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