diff options
Diffstat (limited to 'src/acpi/acpi_pptt.c')
| -rw-r--r-- | src/acpi/acpi_pptt.c | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/src/acpi/acpi_pptt.c b/src/acpi/acpi_pptt.c new file mode 100644 index 0000000000..3822bf7dcf --- /dev/null +++ b/src/acpi/acpi_pptt.c @@ -0,0 +1,186 @@ +/* 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; +} |