milos-linux/include/linux/arm_mpam.h

/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (C) 2025 Arm Ltd. */

#ifndef __LINUX_ARM_MPAM_H
#define __LINUX_ARM_MPAM_H

#include <linux/acpi.h>
#include <linux/resctrl_types.h>
#include <linux/types.h>

struct mpam_msc;

enum mpam_msc_iface {
	MPAM_IFACE_MMIO,	/* a real MPAM MSC */
	MPAM_IFACE_PCC,		/* a fake MPAM MSC */
};

enum mpam_class_types {
	MPAM_CLASS_CACHE,	/* Caches, e.g. L2, L3 */
	MPAM_CLASS_MEMORY,	/* Main memory */
	MPAM_CLASS_UNKNOWN,	/* Everything else, e.g. SMMU */
};

#define MPAM_CLASS_ID_DEFAULT	255

#ifdef CONFIG_ACPI_MPAM
int acpi_mpam_parse_resources(struct mpam_msc *msc,
			      struct acpi_mpam_msc_node *tbl_msc);

int acpi_mpam_count_msc(void);
#else
static inline int acpi_mpam_parse_resources(struct mpam_msc *msc,
					    struct acpi_mpam_msc_node *tbl_msc)
{
	return -EINVAL;
}

static inline int acpi_mpam_count_msc(void) { return -EINVAL; }
#endif

#ifdef CONFIG_ARM64_MPAM_DRIVER
int mpam_ris_create(struct mpam_msc *msc, u8 ris_idx,
		    enum mpam_class_types type, u8 class_id, int component_id);
#else
static inline int mpam_ris_create(struct mpam_msc *msc, u8 ris_idx,
				  enum mpam_class_types type, u8 class_id,
				  int component_id)
{
	return -EINVAL;
}
#endif

bool resctrl_arch_alloc_capable(void);
bool resctrl_arch_mon_capable(void);

void resctrl_arch_set_cpu_default_closid(int cpu, u32 closid);
void resctrl_arch_set_closid_rmid(struct task_struct *tsk, u32 closid, u32 rmid);
void resctrl_arch_set_cpu_default_closid_rmid(int cpu, u32 closid, u32 rmid);
void resctrl_arch_sched_in(struct task_struct *tsk);
bool resctrl_arch_match_closid(struct task_struct *tsk, u32 closid);
bool resctrl_arch_match_rmid(struct task_struct *tsk, u32 closid, u32 rmid);
u32 resctrl_arch_rmid_idx_encode(u32 closid, u32 rmid);
void resctrl_arch_rmid_idx_decode(u32 idx, u32 *closid, u32 *rmid);
u32 resctrl_arch_system_num_rmid_idx(void);

struct rdt_resource;
void *resctrl_arch_mon_ctx_alloc(struct rdt_resource *r, enum resctrl_event_id evtid);
void resctrl_arch_mon_ctx_free(struct rdt_resource *r, enum resctrl_event_id evtid, void *ctx);

/*
 * The CPU configuration for MPAM is cheap to write, and is only written if it
 * has changed. No need for fine grained enables.
 */
static inline void resctrl_arch_enable_mon(void) { }
static inline void resctrl_arch_disable_mon(void) { }
static inline void resctrl_arch_enable_alloc(void) { }
static inline void resctrl_arch_disable_alloc(void) { }

static inline unsigned int resctrl_arch_round_mon_val(unsigned int val)
{
	return val;
}

/**
 * mpam_register_requestor() - Register a requestor with the MPAM driver
 * @partid_max:		The maximum PARTID value the requestor can generate.
 * @pmg_max:		The maximum PMG value the requestor can generate.
 *
 * Registers a requestor with the MPAM driver to ensure the chosen system-wide
 * minimum PARTID and PMG values will allow the requestors features to be used.
 *
 * Returns an error if the registration is too late, and a larger PARTID/PMG
 * value has been advertised to user-space. In this case the requestor should
 * not use its MPAM features. Returns 0 on success.
 */
int mpam_register_requestor(u16 partid_max, u8 pmg_max);

#endif /* __LINUX_ARM_MPAM_H */