Commit 1f6776dc authored by James Morse's avatar James Morse Committed by Zeng Heng
Browse files

arm_mpam: Add helpers to allocate monitors 

maillist inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I8T2RT

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/morse/linux.git/log/?h=mpam/snapshot/v6.7-rc2



---------------------------

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>
Signed-off-by: default avatarZeng Heng <zengheng4@huawei.com>
parent b1576ca4

drivers/platform/mpam/mpam_devices.c

+2 −0
Original line number Diff line number Diff line
@@ -244,6 +244,8 @@ mpam_class_alloc(u8 level_idx, enum mpam_class_types type, gfp_t gfp) 
	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/platform/mpam/mpam_internal.h

+35 −0
Original line number Diff line number Diff line
@@ -138,6 +138,9 @@ struct mpam_class 


	/* member of mpam_classes */

	struct list_head	classes_list;



	struct ida		ida_csu_mon;

	struct ida		ida_mbwu_mon;

};



struct mpam_config {
@@ -191,6 +194,38 @@ struct mpam_msc_ris 
	struct mpam_component	*comp;

};



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_range(&class->ida_csu_mon, 0, 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_range(&class->ida_mbwu_mon, 0,

			       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 */

extern struct list_head mpam_classes;

extern struct srcu_struct mpam_srcu;