Commit c891bae6 authored by James Morse's avatar James Morse Committed by Catalin Marinas
Browse files

arm_mpam: Add helpers to allocate monitors 



MPAM's MSC support a number of monitors, each of which supports
bandwidth counters, or cache-storage-utilisation counters. To use
a counter, a monitor needs to be configured. Add helpers to allocate
and free CSU or MBWU monitors.

Signed-off-by: default avatarJames Morse <james.morse@arm.com>
Reviewed-by: default avatarBen Horgan <ben.horgan@arm.com>
Reviewed-by: default avatarJonathan Cameron <jonathan.cameron@huawei.com>
Reviewed-by: default avatarGavin Shan <gshan@redhat.com>
Reviewed-by: default avatarShaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Reviewed-by: default avatarFenghua Yu <fenghuay@nvidia.com>
Tested-by: default avatarFenghua Yu <fenghuay@nvidia.com>
Tested-by: default avatarShaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: default avatarPeter Newman <peternewman@google.com>
Tested-by: default avatarCarl Worth <carl@os.amperecomputing.com>
Tested-by: default avatarGavin Shan <gshan@redhat.com>
Tested-by: default avatarZeng Heng <zengheng4@huawei.com>
Tested-by: default avatarHanjun Guo <guohanjun@huawei.com>
Signed-off-by: default avatarBen Horgan <ben.horgan@arm.com>
Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent 880df85d

drivers/resctrl/mpam_devices.c

+2 −0
Original line number Diff line number Diff line
@@ -305,6 +305,8 @@ mpam_class_alloc(u8 level_idx, enum mpam_class_types type) 
	class->level = level_idx;

	class->type = type;

	INIT_LIST_HEAD_RCU(&class->classes_list);

	ida_init(&class->ida_csu_mon);

	ida_init(&class->ida_mbwu_mon);



	list_add_rcu(&class->classes_list, &mpam_classes);

drivers/resctrl/mpam_internal.h

+35 −0
Original line number Diff line number Diff line
@@ -200,6 +200,9 @@ struct mpam_class { 
	/* member of mpam_classes */

	struct list_head	classes_list;



	struct ida		ida_csu_mon;

	struct ida		ida_mbwu_mon;



	struct mpam_garbage	garbage;

};
@@ -279,6 +282,38 @@ struct mpam_msc_ris { 
	struct mpam_garbage	garbage;

};



static inline int mpam_alloc_csu_mon(struct mpam_class *class)

{

	struct mpam_props *cprops = &class->props;



	if (!mpam_has_feature(mpam_feat_msmon_csu, cprops))

		return -EOPNOTSUPP;



	return ida_alloc_max(&class->ida_csu_mon, cprops->num_csu_mon - 1,

			     GFP_KERNEL);

}



static inline void mpam_free_csu_mon(struct mpam_class *class, int csu_mon)

{

	ida_free(&class->ida_csu_mon, csu_mon);

}



static inline int mpam_alloc_mbwu_mon(struct mpam_class *class)

{

	struct mpam_props *cprops = &class->props;



	if (!mpam_has_feature(mpam_feat_msmon_mbwu, cprops))

		return -EOPNOTSUPP;



	return ida_alloc_max(&class->ida_mbwu_mon, cprops->num_mbwu_mon - 1,

			     GFP_KERNEL);

}



static inline void mpam_free_mbwu_mon(struct mpam_class *class, int mbwu_mon)

{

	ida_free(&class->ida_mbwu_mon, mbwu_mon);

}



/* List of all classes - protected by srcu*/

extern struct srcu_struct mpam_srcu;

extern struct list_head mpam_classes;