cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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acpi_numa.c (2833B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * ACPI 5.1 based NUMA setup for ARM64
      4 * Lots of code was borrowed from arch/x86/mm/srat.c
      5 *
      6 * Copyright 2004 Andi Kleen, SuSE Labs.
      7 * Copyright (C) 2013-2016, Linaro Ltd.
      8 *		Author: Hanjun Guo <hanjun.guo@linaro.org>
      9 *
     10 * Reads the ACPI SRAT table to figure out what memory belongs to which CPUs.
     11 *
     12 * Called from acpi_numa_init while reading the SRAT and SLIT tables.
     13 * Assumes all memory regions belonging to a single proximity domain
     14 * are in one chunk. Holes between them will be included in the node.
     15 */
     16
     17#define pr_fmt(fmt) "ACPI: NUMA: " fmt
     18
     19#include <linux/acpi.h>
     20#include <linux/bitmap.h>
     21#include <linux/kernel.h>
     22#include <linux/mm.h>
     23#include <linux/memblock.h>
     24#include <linux/mmzone.h>
     25#include <linux/module.h>
     26#include <linux/topology.h>
     27
     28#include <asm/numa.h>
     29
     30static int acpi_early_node_map[NR_CPUS] __initdata = { NUMA_NO_NODE };
     31
     32int __init acpi_numa_get_nid(unsigned int cpu)
     33{
     34	return acpi_early_node_map[cpu];
     35}
     36
     37static inline int get_cpu_for_acpi_id(u32 uid)
     38{
     39	int cpu;
     40
     41	for (cpu = 0; cpu < nr_cpu_ids; cpu++)
     42		if (uid == get_acpi_id_for_cpu(cpu))
     43			return cpu;
     44
     45	return -EINVAL;
     46}
     47
     48static int __init acpi_parse_gicc_pxm(union acpi_subtable_headers *header,
     49				      const unsigned long end)
     50{
     51	struct acpi_srat_gicc_affinity *pa;
     52	int cpu, pxm, node;
     53
     54	if (srat_disabled())
     55		return -EINVAL;
     56
     57	pa = (struct acpi_srat_gicc_affinity *)header;
     58	if (!pa)
     59		return -EINVAL;
     60
     61	if (!(pa->flags & ACPI_SRAT_GICC_ENABLED))
     62		return 0;
     63
     64	pxm = pa->proximity_domain;
     65	node = pxm_to_node(pxm);
     66
     67	/*
     68	 * If we can't map the UID to a logical cpu this
     69	 * means that the UID is not part of possible cpus
     70	 * so we do not need a NUMA mapping for it, skip
     71	 * the SRAT entry and keep parsing.
     72	 */
     73	cpu = get_cpu_for_acpi_id(pa->acpi_processor_uid);
     74	if (cpu < 0)
     75		return 0;
     76
     77	acpi_early_node_map[cpu] = node;
     78	pr_info("SRAT: PXM %d -> MPIDR 0x%llx -> Node %d\n", pxm,
     79		cpu_logical_map(cpu), node);
     80
     81	return 0;
     82}
     83
     84void __init acpi_map_cpus_to_nodes(void)
     85{
     86	acpi_table_parse_entries(ACPI_SIG_SRAT, sizeof(struct acpi_table_srat),
     87					    ACPI_SRAT_TYPE_GICC_AFFINITY,
     88					    acpi_parse_gicc_pxm, 0);
     89}
     90
     91/* Callback for Proximity Domain -> ACPI processor UID mapping */
     92void __init acpi_numa_gicc_affinity_init(struct acpi_srat_gicc_affinity *pa)
     93{
     94	int pxm, node;
     95
     96	if (srat_disabled())
     97		return;
     98
     99	if (pa->header.length < sizeof(struct acpi_srat_gicc_affinity)) {
    100		pr_err("SRAT: Invalid SRAT header length: %d\n",
    101			pa->header.length);
    102		bad_srat();
    103		return;
    104	}
    105
    106	if (!(pa->flags & ACPI_SRAT_GICC_ENABLED))
    107		return;
    108
    109	pxm = pa->proximity_domain;
    110	node = acpi_map_pxm_to_node(pxm);
    111
    112	if (node == NUMA_NO_NODE || node >= MAX_NUMNODES) {
    113		pr_err("SRAT: Too many proximity domains %d\n", pxm);
    114		bad_srat();
    115		return;
    116	}
    117
    118	node_set(node, numa_nodes_parsed);
    119}
    120