]> git.ipfire.org Git - thirdparty/kernel/linux.git/commit
arm_mpam: Probe and reset the rest of the features
authorJames Morse <james.morse@arm.com>
Wed, 19 Nov 2025 12:22:54 +0000 (12:22 +0000)
committerCatalin Marinas <catalin.marinas@arm.com>
Wed, 19 Nov 2025 18:34:22 +0000 (18:34 +0000)
commit880df85d8673f8e2395f139d3618661366e5d4d8
tree2496eb9147815b00b3adb0b3821e4a454df4e680
parent09b89d2a72f37b078198cbb09d5b9e13ba9d68b9
arm_mpam: Probe and reset the rest of the features

MPAM supports more features than are going to be exposed to resctrl.
For partid other than 0, the reset values of these controls isn't
known.

Discover the rest of the features so they can be reset to avoid any
side effects when resctrl is in use.

PARTID narrowing allows MSC/RIS to support less configuration space than
is usable. If this feature is found on a class of device we are likely
to use, then reduce the partid_max to make it usable. This allows us
to map a PARTID to itself.

CC: Rohit Mathew <Rohit.Mathew@arm.com>
CC: Zeng Heng <zengheng4@huawei.com>
CC: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: James Morse <james.morse@arm.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Reviewed-by: Gavin Shan <gshan@redhat.com>
Reviewed-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Tested-by: Fenghua Yu <fenghuay@nvidia.com>
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Peter Newman <peternewman@google.com>
Tested-by: Carl Worth <carl@os.amperecomputing.com>
Tested-by: Gavin Shan <gshan@redhat.com>
Tested-by: Zeng Heng <zengheng4@huawei.com>
Tested-by: Hanjun Guo <guohanjun@huawei.com>
Signed-off-by: Ben Horgan <ben.horgan@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
drivers/resctrl/mpam_devices.c
drivers/resctrl/mpam_internal.h