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ACPI/PPTT: Add support for ACPI 6.3 thread flag

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Commit bbd1b70639f785a970d998f35155c713f975e3ac upstream.

ACPI 6.3 adds a flag to the CPU node to indicate whether
the given PE is a thread. Add a function to return that
information for a given linux logical CPU.

Signed-off-by: Jeremy Linton <jeremy.linton@arm.com>
Reviewed-by: Sudeep Holla <sudeep.holla@arm.com>
Reviewed-by: Robert Richter <rrichter@marvell.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Will Deacon <will@kernel.org>
[jpg: backport for 4.19, replace acpi_pptt_warn_missing()]
Signed-off-by: John Garry <john.garry@huawei.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jeremy Linton 2019-10-14 17:56:25 +08:00 committed by Greg Kroah-Hartman
parent a73306414f
commit b098a4cd99
2 changed files with 57 additions and 0 deletions
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52
drivers/acpi/pptt.c
View file

@ -509,6 +509,44 @@ static int find_acpi_cpu_topology_tag(unsigned int cpu, int level, int flag)
return retval;
}
/**
* check_acpi_cpu_flag() - Determine if CPU node has a flag set
* @cpu: Kernel logical CPU number
* @rev: The minimum PPTT revision defining the flag
* @flag: The flag itself
*
* Check the node representing a CPU for a given flag.
*
* Return: -ENOENT if the PPTT doesn't exist, the CPU cannot be found or
* the table revision isn't new enough.
* 1, any passed flag set
* 0, flag unset
*/
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)) {
pr_warn_once("No PPTT table found, cpu topology may be inaccurate\n");
return ret;
}
if (table->revision >= rev)
cpu_node = acpi_find_processor_node(table, acpi_cpu_id);
if (cpu_node)
ret = (cpu_node->flags & flag) != 0;
acpi_put_table(table);
return ret;
}
/**
* acpi_find_last_cache_level() - Determines the number of cache levels for a PE
* @cpu: Kernel logical cpu number
@ -573,6 +611,20 @@ int cache_setup_acpi(unsigned int cpu)
return status;
}
/**
* acpi_pptt_cpu_is_thread() - Determine if CPU is a thread
* @cpu: Kernel logical CPU number
*
* Return: 1, a thread
* 0, not a thread
* -ENOENT ,if the PPTT doesn't exist, the CPU cannot be found or
* the table revision isn't new enough.
*/
int acpi_pptt_cpu_is_thread(unsigned int cpu)
{
return check_acpi_cpu_flag(cpu, 2, ACPI_PPTT_ACPI_PROCESSOR_IS_THREAD);
}
/**
* find_acpi_cpu_topology() - Determine a unique topology value for a given cpu
* @cpu: Kernel logical cpu number

5
include/linux/acpi.h
View file

@ -1291,10 +1291,15 @@ static inline int lpit_read_residency_count_address(u64 *address)
#endif
#ifdef CONFIG_ACPI_PPTT
int acpi_pptt_cpu_is_thread(unsigned int cpu);
int find_acpi_cpu_topology(unsigned int cpu, int level);
int find_acpi_cpu_topology_package(unsigned int cpu);
int find_acpi_cpu_cache_topology(unsigned int cpu, int level);
#else
static inline int acpi_pptt_cpu_is_thread(unsigned int cpu)
{
return -EINVAL;
}
static inline int find_acpi_cpu_topology(unsigned int cpu, int level)
{
return -EINVAL;