linux/arch/x86/kernel/cpu/resctrl/ctrlmondata.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Resource Director Technology(RDT)
 * - Cache Allocation code.
 *
 * Copyright (C) 2016 Intel Corporation
 *
 * Authors:
 *    Fenghua Yu <[email protected]>
 *    Tony Luck <[email protected]>
 *
 * More information about RDT be found in the Intel (R) x86 Architecture
 * Software Developer Manual June 2016, volume 3, section 17.17.
 */

#define pr_fmt(fmt) …

#include <linux/cpu.h>
#include <linux/kernfs.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/tick.h>

#include "internal.h"

/*
 * Check whether MBA bandwidth percentage value is correct. The value is
 * checked against the minimum and max bandwidth values specified by the
 * hardware. The allocated bandwidth percentage is rounded to the next
 * control step available on the hardware.
 */
static bool bw_validate(char *buf, u32 *data, struct rdt_resource *r)
{ … }

int parse_bw(struct rdt_parse_data *data, struct resctrl_schema *s,
	     struct rdt_ctrl_domain *d)
{ … }

/*
 * Check whether a cache bit mask is valid.
 * On Intel CPUs, non-contiguous 1s value support is indicated by CPUID:
 *   - CPUID.0x10.1:ECX[3]: L3 non-contiguous 1s value supported if 1
 *   - CPUID.0x10.2:ECX[3]: L2 non-contiguous 1s value supported if 1
 *
 * Haswell does not support a non-contiguous 1s value and additionally
 * requires at least two bits set.
 * AMD allows non-contiguous bitmasks.
 */
static bool cbm_validate(char *buf, u32 *data, struct rdt_resource *r)
{ … }

/*
 * Read one cache bit mask (hex). Check that it is valid for the current
 * resource type.
 */
int parse_cbm(struct rdt_parse_data *data, struct resctrl_schema *s,
	      struct rdt_ctrl_domain *d)
{ … }

/*
 * For each domain in this resource we expect to find a series of:
 *	id=mask
 * separated by ";". The "id" is in decimal, and must match one of
 * the "id"s for this resource.
 */
static int parse_line(char *line, struct resctrl_schema *s,
		      struct rdtgroup *rdtgrp)
{ … }

static u32 get_config_index(u32 closid, enum resctrl_conf_type type)
{ … }

int resctrl_arch_update_one(struct rdt_resource *r, struct rdt_ctrl_domain *d,
			    u32 closid, enum resctrl_conf_type t, u32 cfg_val)
{ … }

int resctrl_arch_update_domains(struct rdt_resource *r, u32 closid)
{ … }

static int rdtgroup_parse_resource(char *resname, char *tok,
				   struct rdtgroup *rdtgrp)
{ … }

ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
				char *buf, size_t nbytes, loff_t off)
{ … }

u32 resctrl_arch_get_config(struct rdt_resource *r, struct rdt_ctrl_domain *d,
			    u32 closid, enum resctrl_conf_type type)
{ … }

static void show_doms(struct seq_file *s, struct resctrl_schema *schema, int closid)
{ … }

int rdtgroup_schemata_show(struct kernfs_open_file *of,
			   struct seq_file *s, void *v)
{ … }

static int smp_mon_event_count(void *arg)
{ … }

void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,
		    struct rdt_mon_domain *d, struct rdtgroup *rdtgrp,
		    cpumask_t *cpumask, int evtid, int first)
{ … }

int rdtgroup_mondata_show(struct seq_file *m, void *arg)
{ … }