Commit 45f06523 authored by James Morse's avatar James Morse Committed by Zeng Heng
Browse files

ACPI / PPTT: Add a helper to fill a cpumask from a processor container 

maillist inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I8T2RT

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/morse/linux.git/log/?h=mpam/snapshot/v6.7-rc2



---------------------------

The ACPI table for MPAM describes a set of CPUs with the UID of a
processor container. These exist both in the namespace and the PPTT.

Using the existing for-each helpers, provide a helper to find the
specified processor container in the PPTT, and fill a cpumask
with the CPUs that belong to it.

Signed-off-by: default avatarJames Morse <james.morse@arm.com>
Signed-off-by: default avatarZeng Heng <zengheng4@huawei.com>
parent 5b5d00ab

drivers/acpi/pptt.c

+67 −0
Original line number Diff line number Diff line
@@ -295,6 +295,38 @@ static struct acpi_pptt_processor *acpi_find_processor_node(struct acpi_table_he 
	return NULL;

}



/* parent_node points into the table, but the table isn't provided. */

static void acpi_pptt_get_child_cpus(struct acpi_pptt_processor *parent_node,

				     cpumask_t *cpus)

{

	struct acpi_pptt_processor *cpu_node;

	struct acpi_table_header *table_hdr;

	acpi_status status;

	u32 acpi_id;

	int cpu;



	status = acpi_get_table(ACPI_SIG_PPTT, 0, &table_hdr);

	if (ACPI_FAILURE(status))

		return;



	for_each_possible_cpu(cpu) {

		acpi_id = get_acpi_id_for_cpu(cpu);

		cpu_node = acpi_find_processor_node(table_hdr, acpi_id);



		while (cpu_node) {

			if (cpu_node == parent_node) {

				cpumask_set_cpu(cpu, cpus);

				break;

			}

			cpu_node = fetch_pptt_node(table_hdr, cpu_node->parent);

		}

	}



	acpi_put_table(table_hdr);



	return;

}



/**

 * acpi_pptt_for_each_container() - Iterate over all processor containers

 *
@@ -351,6 +383,41 @@ int acpi_pptt_for_each_container(acpi_pptt_cpu_callback_t callback, void *arg) 
	return ret;

}



struct __cpus_from_container_arg {

	u32 acpi_cpu_id;

	cpumask_t *cpus;

};



static int __cpus_from_container(struct acpi_pptt_processor *container, void *arg)

{

	struct __cpus_from_container_arg *params = arg;



	if (container->acpi_processor_id == params->acpi_cpu_id)

		acpi_pptt_get_child_cpus(container, params->cpus);



	return 0;

}



/**

 * acpi_pptt_get_cpus_from_container() - Populate a cpumask with all CPUs in a

 * 					 processor containers

 *

 * Find the specified Processor Container, and fill cpus with all the cpus

 * below it.

 *

 * Return: 0 for a complete walk, or an error if the mask is incomplete.

 */

int acpi_pptt_get_cpus_from_container(u32 acpi_cpu_id, cpumask_t *cpus)

{

	struct __cpus_from_container_arg params;



	params.acpi_cpu_id = acpi_cpu_id;

	params.cpus = cpus;



	cpumask_clear(cpus);

	return acpi_pptt_for_each_container(&__cpus_from_container, &params);

}



static u8 acpi_cache_type(enum cache_type type)

{

	switch (type) {

include/linux/acpi.h

+6 −0
Original line number Diff line number Diff line
@@ -1496,6 +1496,7 @@ int find_acpi_cpu_topology_cluster(unsigned int cpu); 
int find_acpi_cpu_topology_package(unsigned int cpu);

int find_acpi_cpu_topology_hetero_id(unsigned int cpu);

int find_acpi_cache_level_from_id(u32 cache_id);

int acpi_pptt_get_cpus_from_container(u32 acpi_cpu_id, cpumask_t *cpus);

#else

static inline int acpi_pptt_cpu_is_thread(unsigned int cpu)

{
@@ -1521,6 +1522,11 @@ static inline int find_acpi_cache_level_from_id(u32 cache_id) 
{

	return -EINVAL;

}

static inline int acpi_pptt_get_cpus_from_container(u32 acpi_cpu_id,

						    cpumask_t *cpus)

{

	return -EINVAL;

}

#endif



#ifdef CONFIG_ARM64