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Subject[PATCH 4.19 69/81] ACPI/PPTT: Add support for ACPI 6.3 thread flag
Date
From: Jeremy Linton <jeremy.linton@arm.com>

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>
---
drivers/acpi/pptt.c | 52 ++++++++++++++++++++++++++++++++++++++++++++
include/linux/acpi.h | 5 +++++
2 files changed, 57 insertions(+)

diff --git a/drivers/acpi/pptt.c b/drivers/acpi/pptt.c
index da031b1df6f5c..9dbf86a0c8277 100644
--- a/drivers/acpi/pptt.c
+++ b/drivers/acpi/pptt.c
@@ -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
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index b4d23b3a2ef2d..59a416dfcaaa2 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -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;
--
2.20.1


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