diff --git a/drivers/acpi/pptt.c b/drivers/acpi/pptt.c index dd3222a15c9c5d..c91342dcbcd636 100644 --- a/drivers/acpi/pptt.c +++ b/drivers/acpi/pptt.c @@ -533,21 +533,37 @@ static int topology_get_acpi_cpu_tag(struct acpi_table_header *table, return -ENOENT; } + +static struct acpi_table_header *acpi_get_pptt(void) +{ + static struct acpi_table_header *pptt; + acpi_status status; + + /* + * PPTT will be used at runtime on every CPU hotplug in path, so we + * don't need to call acpi_put_table() to release the table mapping. + */ + if (!pptt) { + status = acpi_get_table(ACPI_SIG_PPTT, 0, &pptt); + if (ACPI_FAILURE(status)) + acpi_pptt_warn_missing(); + } + + return pptt; +} + 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(); + table = acpi_get_pptt(); + if (!table) 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; } @@ -568,16 +584,13 @@ static int find_acpi_cpu_topology_tag(unsigned int cpu, int level, int flag) static int check_acpi_cpu_flag(unsigned int cpu, int rev, u32 flag) { struct acpi_table_header *table; - acpi_status status; u32 acpi_cpu_id = get_acpi_id_for_cpu(cpu); struct acpi_pptt_processor *cpu_node = NULL; int ret = -ENOENT; - status = acpi_get_table(ACPI_SIG_PPTT, 0, &table); - if (ACPI_FAILURE(status)) { - acpi_pptt_warn_missing(); - return ret; - } + table = acpi_get_pptt(); + if (!table) + return -ENOENT; if (table->revision >= rev) cpu_node = acpi_find_processor_node(table, acpi_cpu_id); @@ -585,8 +598,6 @@ static int check_acpi_cpu_flag(unsigned int cpu, int rev, u32 flag) if (cpu_node) ret = (cpu_node->flags & flag) != 0; - acpi_put_table(table); - return ret; } @@ -605,18 +616,15 @@ 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; + + table = acpi_get_pptt(); + if (!table) + return -ENOENT; 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); - } + number_of_levels = acpi_find_cache_levels(table, acpi_cpu_id); pr_debug("Cache Setup find last level level=%d\n", number_of_levels); return number_of_levels; @@ -638,20 +646,16 @@ int acpi_find_last_cache_level(unsigned int cpu) 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(); + table = acpi_get_pptt(); + if (!table) return -ENOENT; - } + + pr_debug("Cache Setup ACPI CPU %d\n", cpu); cache_setup_acpi_cpu(table, cpu); - acpi_put_table(table); - return status; + return 0; } /** @@ -730,50 +734,38 @@ int find_acpi_cpu_topology_package(unsigned int cpu) int find_acpi_cpu_topology_cluster(unsigned int cpu) { struct acpi_table_header *table; - acpi_status status; struct acpi_pptt_processor *cpu_node, *cluster_node; u32 acpi_cpu_id; int retval; int is_thread; - status = acpi_get_table(ACPI_SIG_PPTT, 0, &table); - if (ACPI_FAILURE(status)) { - acpi_pptt_warn_missing(); + table = acpi_get_pptt(); + if (!table) return -ENOENT; - } acpi_cpu_id = get_acpi_id_for_cpu(cpu); cpu_node = acpi_find_processor_node(table, acpi_cpu_id); - if (cpu_node == NULL || !cpu_node->parent) { - retval = -ENOENT; - goto put_table; - } + if (!cpu_node || !cpu_node->parent) + return -ENOENT; is_thread = cpu_node->flags & ACPI_PPTT_ACPI_PROCESSOR_IS_THREAD; cluster_node = fetch_pptt_node(table, cpu_node->parent); - if (cluster_node == NULL) { - retval = -ENOENT; - goto put_table; - } + if (!cluster_node) + return -ENOENT; + if (is_thread) { - if (!cluster_node->parent) { - retval = -ENOENT; - goto put_table; - } + if (!cluster_node->parent) + return -ENOENT; + cluster_node = fetch_pptt_node(table, cluster_node->parent); - if (cluster_node == NULL) { - retval = -ENOENT; - goto put_table; - } + if (!cluster_node) + return -ENOENT; } if (cluster_node->flags & ACPI_PPTT_ACPI_PROCESSOR_ID_VALID) retval = cluster_node->acpi_processor_id; else retval = ACPI_PTR_DIFF(cluster_node, table); -put_table: - acpi_put_table(table); - return retval; }