linux/drivers/platform/x86/intel_speed_select_if
Srinivas Pandruvada aa2ddd2425 platform/x86: ISST: Use numa node id for cpu pci dev mapping
There is a problem in mapping CPU to a PCI device instance when the
bus numbers are reused in different packages. This was observed on
some Sapphire Rapids systems.

The current implementation reads bus number assigned to a CPU package
via MSR 0x128. This allows to establish relationship between a CPU
and a PCI device. This allows to update power related parameters to a
MMIO offset in a PCI device space which is unique to a CPU. But if
two packages uses same bus number then this mapping will not be unique.

When bus number is reused, PCI device will use different domain number
or segment number. So we need to be aware of this domain information
while matching CPU to PCI bus number. This domain information is not
available via any MSR. So need to use ACPI numa node information.

There is an interface already available in the Linux to read numa
node for a CPU and a PCI device. This change uses this interface
to check the numa node of a match PCI device with bus number.
If the bus number and numa node matches with the CPU's assigned
bus number and numa node, the matched PCI device instance will be
returned to the caller.

It is possible that before Sapphire Rapids, the numa node is not
defined for the Speed Select PCI device in some OEM systems. In this
case to restore old behavior, return the last matched PCI device
for domain 0 unlsess there are more than one matches.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Link: https://lore.kernel.org/r/20210616221329.1909276-2-srinivas.pandruvada@linux.intel.com
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
2021-06-18 15:29:36 +02:00
..
isst_if_common.c platform/x86: ISST: Use numa node id for cpu pci dev mapping 2021-06-18 15:29:36 +02:00
isst_if_common.h platform/x86: ISST: Change PCI device macros 2020-12-07 16:10:12 +01:00
isst_if_mbox_msr.c platform/x86: Convert to new CPU match macros 2020-03-24 21:33:00 +01:00
isst_if_mbox_pci.c platform/x86: ISST: Account for increased timeout in some cases 2021-04-07 19:47:22 +02:00
isst_if_mmio.c platform/x86: ISST: Mark mmio_range_devid_0 and mmio_range_devid_1 with static keyword 2020-12-08 16:30:55 +01:00
Kconfig
Makefile platform/x86: ISST: Add Intel Speed Select mailbox interface via MSRs 2019-07-02 18:41:16 +03:00