Re: [PATCH v3 0/7] Support PPTT for ARM64

[John Garry <john.garry@huawei.com>]

On 12/10/2017 20:48, Jeremy Linton wrote:
> ACPI 6.2 adds the Processor Properties Topology Table (PPTT), which is
> used to describe the processor and cache topology. Ideally it is
> used to extend/override information provided by the hardware, but
> right now ARM64 is entirely dependent on firmware provided tables.
>
> This patch parses the table for the cache topology and CPU topology.
> For the latter we also add an additional topology_cod_id() macro,
> and a package_id for arm64. Initially the physical id will match
> the cluster id, but we update users of the cluster to utilize
> the new macro. When we enable ACPI/PPTT for arm64 we map the socket
> to the physical id as the remainder of the kernel expects.
>

Hi Jeremy,

Can you put this series on a public branch for convenience of review and 
test?

Also, what is your idea for supporting Type 2 ID structure?

Cheers,
John

> For example on juno:
> [root@mammon-juno-rh topology]# lstopo-no-graphics
>   Package L#0
>     L2 L#0 (1024KB)
>       L1d L#0 (32KB) + L1i L#0 (32KB) + Core L#0 + PU L#0 (P#0)
>       L1d L#1 (32KB) + L1i L#1 (32KB) + Core L#1 + PU L#1 (P#1)
>       L1d L#2 (32KB) + L1i L#2 (32KB) + Core L#2 + PU L#2 (P#2)
>       L1d L#3 (32KB) + L1i L#3 (32KB) + Core L#3 + PU L#3 (P#3)
>     L2 L#1 (2048KB)
>       L1d L#4 (32KB) + L1i L#4 (48KB) + Core L#4 + PU L#4 (P#4)
>       L1d L#5 (32KB) + L1i L#5 (48KB) + Core L#5 + PU L#5 (P#5)
>   HostBridge L#0
>     PCIBridge
>       PCIBridge
>         PCIBridge
>           PCI 1095:3132
>             Block(Disk) L#0 "sda"
>         PCIBridge
>           PCI 1002:68f9
>             GPU L#1 "renderD128"
>             GPU L#2 "card0"
>             GPU L#3 "controlD64"
>         PCIBridge
>           PCI 11ab:4380
>             Net L#4 "enp8s0"
>
> v2->v3:
>
> Remove valid bit check on leaf nodes. Now simply being a leaf node
>   is sufficient to verify the processor id against the ACPI
>   processor ids (gotten from MADT).
>
> Use the acpi processor for the "level 0" Id. This makes the /sys
>   visible core/thread ids more human readable if the firmware uses
>   small consecutive values for processor ids.
>
> Added PPTT to the list of injectable ACPI tables.
>
> Fix bug which kept the code from using the processor node as intended
>   in v2, caused by misuse of git rebase/fixup.
>
> v1->v2:
>
> The parser keys off the acpi_pptt_processor node to determine
>   unique cache's rather than the acpi_pptt_cache referenced by the
>   processor node. This allows PPTT tables which "share" cache nodes
>   across cpu nodes despite not being a shared cache.
>
> Normalize the socket, cluster and thread mapping so that they match
>   linux's traditional mapping for the physical id, and thread id.
>   Adding explicit scheduler knowledge of clusters (rather than just
>   their cache sharing attributes) is a subject for a future patch.
>
> Jeremy Linton (7):
>   ACPI/PPTT: Add Processor Properties Topology Table parsing
>   ACPI: Enable PPTT support on ARM64
>   drivers: base: cacheinfo: arm64: Add support for ACPI based firmware
>     tables
>   Topology: Add cluster on die macros and arm64 decoding
>   arm64: Fixup users of topology_physical_package_id
>   arm64: topology: Enable ACPI/PPTT based CPU topology.
>   ACPI: Add PPTT to injectable table list
>
>  arch/arm64/Kconfig                |   1 +
>  arch/arm64/include/asm/topology.h |   4 +-
>  arch/arm64/kernel/cacheinfo.c     |  23 +-
>  arch/arm64/kernel/topology.c      |  62 ++++-
>  drivers/acpi/Makefile             |   1 +
>  drivers/acpi/arm64/Kconfig        |   3 +
>  drivers/acpi/pptt.c               | 486 ++++++++++++++++++++++++++++++++++++++
>  drivers/acpi/tables.c             |   3 +-
>  drivers/base/cacheinfo.c          |  17 +-
>  drivers/cpufreq/arm_big_little.c  |   2 +-
>  drivers/firmware/psci_checker.c   |   2 +-
>  include/linux/cacheinfo.h         |  11 +-
>  include/linux/topology.h          |   4 +
>  13 files changed, 599 insertions(+), 20 deletions(-)
>  create mode 100644 drivers/acpi/pptt.c
>