diff options
| author | James Morse <james.morse@arm.com> | 2025-11-19 12:22:44 +0000 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2025-11-19 18:34:20 +0000 |
| commit | bd221f9f82afb616887e0b88b43fbb937479d744 (patch) | |
| tree | 33bf6a34a1194d2e979cd16fd9af25e97972c07a /drivers/resctrl/mpam_internal.h | |
| parent | 8f8d0ac1da7885c0d619636f93e0983239dc145c (diff) | |
arm_mpam: Probe hardware to find the supported partid/pmg values
CPUs can generate traffic with a range of PARTID and PMG values,
but each MSC may also have its own maximum size for these fields.
Before MPAM can be used, the driver needs to probe each RIS on
each MSC, to find the system-wide smallest value that can be used.
The limits from requestors (e.g. CPUs) also need taking into account.
While doing this, RIS entries that firmware didn't describe are created
under MPAM_CLASS_UNKNOWN.
This adds the low level MSC write accessors.
While we're here, implement the mpam_register_requestor() call
for the arch code to register the CPU limits. Future callers of this
will tell us about the SMMU and ITS.
Signed-off-by: James Morse <james.morse@arm.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Reviewed-by: Ben Horgan <ben.horgan@arm.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>
Diffstat (limited to 'drivers/resctrl/mpam_internal.h')
| -rw-r--r-- | drivers/resctrl/mpam_internal.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/resctrl/mpam_internal.h b/drivers/resctrl/mpam_internal.h index 4e1538d29783..768a58a3ab27 100644 --- a/drivers/resctrl/mpam_internal.h +++ b/drivers/resctrl/mpam_internal.h @@ -49,6 +49,8 @@ struct mpam_msc { */ struct mutex probe_lock; bool probed; + u16 partid_max; + u8 pmg_max; unsigned long ris_idxs; u32 ris_max; @@ -138,6 +140,10 @@ struct mpam_msc_ris { extern struct srcu_struct mpam_srcu; extern struct list_head mpam_classes; +/* System wide partid/pmg values */ +extern u16 mpam_partid_max; +extern u8 mpam_pmg_max; + /* Scheduled work callback to enable mpam once all MSC have been probed */ void mpam_enable(struct work_struct *work); void mpam_disable(struct work_struct *work); |