Commit 3e9b3582 authored by Ben Horgan's avatar Ben Horgan Committed by James Morse
Browse files

arm_mpam: resctrl: Add rmid index helpers 



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: default avatarGavin Shan <gshan@redhat.com>
Tested-by: default avatarShaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: default avatarPeter Newman <peternewman@google.com>
Tested-by: default avatarZeng Heng <zengheng4@huawei.com>
Tested-by: default avatarPunit Agrawal <punit.agrawal@oss.qualcomm.com>
Tested-by: default avatarJesse Chick <jessechick@os.amperecomputing.com>
Reviewed-by: default avatarZeng Heng <zengheng4@huawei.com>
Reviewed-by: default avatarShaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Reviewed-by: default avatarJonathan Cameron <jonathan.cameron@huawei.com>
Reviewed-by: default avatarGavin Shan <gshan@redhat.com>
Suggested-by: default avatarJames Morse <james.morse@arm.com>
Signed-off-by: default avatarBen Horgan <ben.horgan@arm.com>
Signed-off-by: default avatarJames Morse <james.morse@arm.com>
parent 80d147d2

drivers/resctrl/mpam_resctrl.c

+16 −0
Original line number Diff line number Diff line
@@ -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();

include/linux/arm_mpam.h

+3 −0
Original line number Diff line number Diff line
@@ -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