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Subject[PATCH v5 0/9] Support PPTT for ARM64
This patch set is dependent on "[14/15] ACPICA: ACPI 6.2: Additional
PPTT flags"

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.
When we enable ACPI/PPTT for arm64 we map the physical_id to the
PPTT node flagged as the physical package by the firmware.
This results in topologies that match what the remainder of the
system expects.

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
PCI 1095:3132
Block(Disk) L#0 "sda"
PCI 1002:68f9
GPU L#1 "renderD128"
GPU L#2 "card0"
GPU L#3 "controlD64"
PCI 11ab:4380
Net L#4 "enp8s0"

Git tree at:
branch: pptt_v5

Update the cache type from NOCACHE to UNIFIED when all the cache
attributes we update are valid. This fixes a problem where caches
which are entirely created by the PPTT don't show up in lstopo.

Give the PPTT its own firmware_node in the cache structure instead of
sharing it with the of_node.

Move some pieces around between patches.

Suppress the "Found duplicate cache level/type..." message if the
duplicate cache entry is actually a duplicate node. This allows cases
like L1I and L1D nodes that point at the same L2 node to be accepted
without the warning.

Remove cluster/physical split code. Add a patch to rename cluster_id
so that its clear the topology may not be referring to a cluster.

Add additional ACPICA patch for the PPTT cache properties. This matches
an outstanding ACPICA pull that should be merged in the near future.

Replace a number of (struct*)((u8*)ptr+offset) constructs with ACPI_ADD_PTR

Split out the topology parsing into an additional patch.

Tweak the cpu topology code to terminate on either a level, or a flag.
Add an additional function which retrives the physical package id
for a given cpu.

Various other comments/tweaks.


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.


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.

Jeremy Linton (9):
arm64/acpi: Create arch specific cpu to acpi id helper
ACPI/PPTT: Add Processor Properties Topology Table parsing
ACPI: Enable PPTT support on ARM64
drivers: base cacheinfo: Add support for ACPI based firmware tables
arm64: Add support for ACPI based firmware tables
ACPI/PPTT: Add topology parsing code
arm64: Topology, rename cluster_id
arm64: topology: Enable ACPI/PPTT based CPU topology.
ACPI: Add PPTT to injectable table list

arch/arm64/Kconfig | 1 +
arch/arm64/include/asm/acpi.h | 4 +
arch/arm64/include/asm/topology.h | 4 +-
arch/arm64/kernel/cacheinfo.c | 15 +-
arch/arm64/kernel/topology.c | 74 ++++-
drivers/acpi/Kconfig | 3 +
drivers/acpi/Makefile | 1 +
drivers/acpi/pptt.c | 592 ++++++++++++++++++++++++++++++++++++++
drivers/acpi/tables.c | 3 +-
drivers/base/cacheinfo.c | 20 +-
include/linux/cacheinfo.h | 13 +-
include/linux/topology.h | 2 +
12 files changed, 703 insertions(+), 29 deletions(-)
create mode 100644 drivers/acpi/pptt.c


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