mbox series

[v4,0/2] arm64/PPTT ACPI 6.3 thread flag support

Message ID 20190808204007.30110-1-jeremy.linton@arm.com
Headers show
Series arm64/PPTT ACPI 6.3 thread flag support | expand

Message

Jeremy Linton Aug. 8, 2019, 8:40 p.m. UTC 
ACPI 6.3 adds a flag to the CPU node to indicate whether
the given CPU is a thread. Add a function to return that
information for a given linux logical CPU and then utilize
it while building the arm64 topology.

v4->v5: Add Sudeep's Reviewed tag
	Trivial comment tweaks
	Move is_threaded logic from parse_acpi_topology()
	      to apci_cpu_is_threaded()

v3->v4: Remove table revision cache as this code path is only
	      called during boot and there aren't any
	      indications that it presents a perf issue.
	Rebase to 5.3

v2->v3: Clarify and tweak the return from check_acpi_cpu_flag()
	Cache the PPTT table revision to avoid repeat
	      acpi_table_get/put calls in the case of
	      missing or old PPTT tables.

v1->v2:
	Return ENOENT instead on ENONET.

Jeremy Linton (2):
  ACPI/PPTT: Add support for ACPI 6.3 thread flag
  arm64: topology: Use PPTT to determine if PE is a thread

 arch/arm64/kernel/topology.c | 19 ++++++++++---
 drivers/acpi/pptt.c          | 53 +++++++++++++++++++++++++++++++++++-
 include/linux/acpi.h         |  5 ++++
 3 files changed, 72 insertions(+), 5 deletions(-)

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2.21.0