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

ANBZ: #1644

cherry-picked from https://git.kernel.org/pub/scm/linux/kernel/git/morse/linux.git

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: James Morse <james.morse@arm.com>
Signed-off-by: Xin Hao <xhao@linux.alibaba.com>
Signed-off-by: Shawn Wang <shawnwang@linux.alibaba.com>
Reviewed-by: Xin Hao <xhao@linux.alibaba.com>
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
This commit is contained in:
James Morse 2021-05-06 13:52:51 +01:00 committed by Xunlei Pang
parent c26f26205c
commit 49e15ee7cb
2 changed files with 41 additions and 0 deletions
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35
drivers/acpi/pptt.c
View File

@ -388,6 +388,41 @@ u32 acpi_pptt_count_containers(void)
return count;
}
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);
}
/*
* acpi_pptt_find_cache_backwards() - Given a PPTT cache find a processor node
* that points to it. This lets us find a cacheinfo node by fw_token, but

6
include/linux/acpi.h
View File

@ -1366,6 +1366,7 @@ int find_acpi_cache_level_from_id(u32 cache_id);
u32 acpi_pptt_count_containers(void);
int acpi_pptt_for_each_container(acpi_pptt_cpu_callback_t callback, void *arg);
void acpi_pptt_get_child_cpus(struct acpi_pptt_processor *parent_node, cpumask_t *cpus);
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)
{
@ -1405,6 +1406,11 @@ acpi_pptt_get_child_cpus(struct acpi_pptt_processor *parent_node,
cpumask_t *cpus)
{
}
static inline int acpi_pptt_get_cpus_from_container(u32 acpi_cpu_id,
cpumask_t *cpus)
{
return -EINVAL;
}
#endif
#ifdef CONFIG_ACPI