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arm_mpam: Add helpers to allocate monitors

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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: James Morse <james.morse@arm.com>
Reviewed-by: Ben Horgan <ben.horgan@arm.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.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>
This commit is contained in:
James Morse
2025-11-19 12:22:55 +00:00
committed by Catalin Marinas
parent 880df85d86
commit c891bae664
2 changed files with 37 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/resctrl/mpam_devices.c
View File

@@ -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);

35
drivers/resctrl/mpam_internal.h
View File

@@ -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;