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/* SPDX-License-Identifier: GPL-2.0 */
// Copyright (C) 2025 Arm Ltd.
#ifndef MPAM_INTERNAL_H
#define MPAM_INTERNAL_H
#include <linux/arm_mpam.h>
#include <linux/cpumask.h>
#include <linux/io.h>
#include <linux/llist.h>
#include <linux/mutex.h>
#include <linux/srcu.h>
#include <linux/types.h>
#define MPAM_MSC_MAX_NUM_RIS 16
struct platform_device;
/*
* Structures protected by SRCU may not be freed for a surprising amount of
* time (especially if perf is running). To ensure the MPAM error interrupt can
* tear down all the structures, build a list of objects that can be garbage
* collected once synchronize_srcu() has returned.
* If pdev is non-NULL, use devm_kfree().
*/
struct mpam_garbage {
/* member of mpam_garbage */
struct llist_node llist;
void *to_free;
struct platform_device *pdev;
};
struct mpam_msc {
/* member of mpam_all_msc */
struct list_head all_msc_list;
int id;
struct platform_device *pdev;
/* Not modified after mpam_is_enabled() becomes true */
enum mpam_msc_iface iface;
u32 nrdy_usec;
cpumask_t accessibility;
/*
* probe_lock is only taken during discovery. After discovery these
* properties become read-only and the lists are protected by SRCU.
*/
struct mutex probe_lock;
unsigned long ris_idxs;
u32 ris_max;
/* mpam_msc_ris of this component */
struct list_head ris;
/*
* part_sel_lock protects access to the MSC hardware registers that are
* affected by MPAMCFG_PART_SEL. (including the ID registers that vary
* by RIS).
* If needed, take msc->probe_lock first.
*/
struct mutex part_sel_lock;
void __iomem *mapped_hwpage;
size_t mapped_hwpage_sz;
struct mpam_garbage garbage;
};
struct mpam_class {
/* mpam_components in this class */
struct list_head components;
cpumask_t affinity;
u8 level;
enum mpam_class_types type;
/* member of mpam_classes */
struct list_head classes_list;
struct mpam_garbage garbage;
};
struct mpam_component {
u32 comp_id;
/* mpam_vmsc in this component */
struct list_head vmsc;
cpumask_t affinity;
/* member of mpam_class:components */
struct list_head class_list;
/* parent: */
struct mpam_class *class;
struct mpam_garbage garbage;
};
struct mpam_vmsc {
/* member of mpam_component:vmsc_list */
struct list_head comp_list;
/* mpam_msc_ris in this vmsc */
struct list_head ris;
/* All RIS in this vMSC are members of this MSC */
struct mpam_msc *msc;
/* parent: */
struct mpam_component *comp;
struct mpam_garbage garbage;
};
struct mpam_msc_ris {
u8 ris_idx;
cpumask_t affinity;
/* member of mpam_vmsc:ris */
struct list_head vmsc_list;
/* member of mpam_msc:ris */
struct list_head msc_list;
/* parent: */
struct mpam_vmsc *vmsc;
struct mpam_garbage garbage;
};
/* List of all classes - protected by srcu*/
extern struct srcu_struct mpam_srcu;
extern struct list_head mpam_classes;
int mpam_get_cpumask_from_cache_id(unsigned long cache_id, u32 cache_level,
cpumask_t *affinity);
#endif /* MPAM_INTERNAL_H */
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