ACPI/PPTT: Add support for ACPI 6.3 thread flag (bbd1b706) · Commits · 戴 / test

drivers/acpi/pptt.c

+52 −1

Original line number	Diff line number	Diff line
		@@ -540,6 +540,44 @@ 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)) {
		acpi_pptt_warn_missing();
		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
		@@ -604,6 +642,20 @@ 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
		@@ -664,7 +716,6 @@ int find_acpi_cpu_cache_topology(unsigned int cpu, int level)
		return ret;
		}


		/**
		* find_acpi_cpu_topology_package() - Determine a unique CPU package value
		* @cpu: Kernel logical CPU number

include/linux/acpi.h

+5 −0

Original line number	Diff line number	Diff line
		@@ -1302,11 +1302,16 @@ 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_topology_hetero_id(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;

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