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: 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>

diff --git a/drivers/resctrl/mpam_devices.c b/drivers/resctrl/mpam_devices.c
index 67eb0c79ca49477478d806af849815eb4c823379..a7ba07ac5a2f8d466fc047d5a0b95d6230ca96d2 100644 (file)
--- a/drivers/resctrl/mpam_devices.c
+++ b/drivers/resctrl/mpam_devices.c
@@ -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);
 

diff --git a/drivers/resctrl/mpam_internal.h b/drivers/resctrl/mpam_internal.h
index 618e5355a95e985356882bd7965c6e3c10fb9c57..8bbc67df6d975d594913ddb7cca00a90e98c11e0 100644 (file)
--- a/drivers/resctrl/mpam_internal.h
+++ b/drivers/resctrl/mpam_internal.h
@@ -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;