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authorJeremy Linton <jeremy.linton@arm.com>2019-06-26 16:37:16 -0500
committerWill Deacon <will@kernel.org>2019-06-27 16:53:18 +0100
commit56855a99f3d0d1e9f1f4e24f5851f9bf14c83296 (patch)
tree32211f461b703b6145dd9348caf70d6aa6d0c6e3 /include/linux/acpi.h
parented2b664fcc8073c09394393756df3fc86977bbac (diff)
ACPI/PPTT: Add function to return ACPI 6.3 Identical tokens
ACPI 6.3 adds a flag to indicate that child nodes are all identical cores. This is useful to authoritatively determine if a set of (possibly offline) cores are identical or not. Since the flag doesn't give us a unique id we can generate one and use it to create bitmaps of sibling nodes, or simply in a loop to determine if a subset of cores are identical. Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Tested-by: Hanjun Guo <hanjun.guo@linaro.org> Reviewed-by: Sudeep Holla <sudeep.holla@arm.com> Signed-off-by: Jeremy Linton <jeremy.linton@arm.com> Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'include/linux/acpi.h')
-rw-r--r--include/linux/acpi.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index d315d86844e4..5bcd23e5ccd6 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -1303,6 +1303,7 @@ static inline int lpit_read_residency_count_address(u64 *address)
#ifdef CONFIG_ACPI_PPTT
int find_acpi_cpu_topology(unsigned int cpu, int level);
int find_acpi_cpu_topology_package(unsigned int cpu);
+int find_acpi_cpu_topology_hetero_id(unsigned int cpu);
int find_acpi_cpu_cache_topology(unsigned int cpu, int level);
#else
static inline int find_acpi_cpu_topology(unsigned int cpu, int level)
@@ -1313,6 +1314,10 @@ static inline int find_acpi_cpu_topology_package(unsigned int cpu)
{
return -EINVAL;
}
+static inline int find_acpi_cpu_topology_hetero_id(unsigned int cpu)
+{
+ return -EINVAL;
+}
static inline int find_acpi_cpu_cache_topology(unsigned int cpu, int level)
{
return -EINVAL;