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arm_mpam: resctrl: Add rmid index helpers

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Because MPAM's pmg aren't identical to RDT's rmid, resctrl handles some
data structures by index. This allows x86 to map indexes to RMID, and MPAM
to map them to partid-and-pmg.

Add the helpers to do this.

Tested-by: Gavin Shan <gshan@redhat.com>
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Peter Newman <peternewman@google.com>
Tested-by: Zeng Heng <zengheng4@huawei.com>
Tested-by: Punit Agrawal <punit.agrawal@oss.qualcomm.com>
Tested-by: Jesse Chick <jessechick@os.amperecomputing.com>
Reviewed-by: Zeng Heng <zengheng4@huawei.com>
Reviewed-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Reviewed-by: Gavin Shan <gshan@redhat.com>
Suggested-by: James Morse <james.morse@arm.com>
Signed-off-by: Ben Horgan <ben.horgan@arm.com>
Signed-off-by: James Morse <james.morse@arm.com>
This commit is contained in:
Ben Horgan 2026-03-13 14:46:00 +00:00 committed by James Morse
parent 80d147d293
commit 3e9b35823a
2 changed files with 19 additions and 0 deletions
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16
drivers/resctrl/mpam_resctrl.c
View File

@ -145,6 +145,22 @@ u32 resctrl_arch_get_num_closid(struct rdt_resource *ignored)
return mpam_partid_max + 1;
}
u32 resctrl_arch_system_num_rmid_idx(void)
{
return (mpam_pmg_max + 1) * (mpam_partid_max + 1);
}
u32 resctrl_arch_rmid_idx_encode(u32 closid, u32 rmid)
{
return closid * (mpam_pmg_max + 1) + rmid;
}
void resctrl_arch_rmid_idx_decode(u32 idx, u32 *closid, u32 *rmid)
{
*closid = idx / (mpam_pmg_max + 1);
*rmid = idx % (mpam_pmg_max + 1);
}
void resctrl_arch_sched_in(struct task_struct *tsk)
{
lockdep_assert_preemption_disabled();

3
include/linux/arm_mpam.h
View File

@ -58,6 +58,9 @@ void resctrl_arch_set_cpu_default_closid_rmid(int cpu, u32 closid, u32 rmid);
void resctrl_arch_sched_in(struct task_struct *tsk);
bool resctrl_arch_match_closid(struct task_struct *tsk, u32 closid);
bool resctrl_arch_match_rmid(struct task_struct *tsk, u32 closid, u32 rmid);
u32 resctrl_arch_rmid_idx_encode(u32 closid, u32 rmid);
void resctrl_arch_rmid_idx_decode(u32 idx, u32 *closid, u32 *rmid);
u32 resctrl_arch_system_num_rmid_idx(void);
/**
* mpam_register_requestor() - Register a requestor with the MPAM driver