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linux/arch/loongarch/kernel/acpi.c
Huacai Chen a6654a40a8 LoongArch: For all possible CPUs setup logical-physical CPU mapping
In order to support ACPI-based physical CPU hotplug, we suppose for all
"possible" CPUs cpu_logical_map() can work. Because some drivers want to
use cpu_logical_map() for all "possible" CPUs, while currently we only
setup logical-physical mapping for "present" CPUs. This lack of mapping
also causes cpu_to_node() cannot work for hot-added CPUs.

All "possible" CPUs are listed in MADT, and the "present" subset is
marked as ACPI_MADT_ENABLED. To setup logical-physical CPU mapping for
all possible CPUs and keep present CPUs continuous in cpu_present_mask,
we parse MADT twice. The first pass handles CPUs with ACPI_MADT_ENABLED
and the second pass handles CPUs without ACPI_MADT_ENABLED.

The global flag (cpu_enumerated) is removed because acpi_map_cpu() calls
cpu_number_map() rather than set_processor_mask() now.

Reported-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
2024-11-12 16:35:36 +08:00

381 lines
8.1 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* acpi.c - Architecture-Specific Low-Level ACPI Boot Support
*
* Author: Jianmin Lv <lvjianmin@loongson.cn>
* Huacai Chen <chenhuacai@loongson.cn>
* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
*/
#include <linux/init.h>
#include <linux/acpi.h>
#include <linux/efi-bgrt.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/memblock.h>
#include <linux/of_fdt.h>
#include <linux/serial_core.h>
#include <asm/io.h>
#include <asm/numa.h>
#include <asm/loongson.h>
int acpi_disabled;
EXPORT_SYMBOL(acpi_disabled);
int acpi_noirq;
int acpi_pci_disabled;
EXPORT_SYMBOL(acpi_pci_disabled);
int acpi_strict = 1; /* We have no workarounds on LoongArch */
int num_processors;
int disabled_cpus;
u64 acpi_saved_sp;
#define PREFIX "ACPI: "
struct acpi_madt_core_pic acpi_core_pic[MAX_CORE_PIC];
void __init __iomem * __acpi_map_table(unsigned long phys, unsigned long size)
{
if (!phys || !size)
return NULL;
return early_memremap(phys, size);
}
void __init __acpi_unmap_table(void __iomem *map, unsigned long size)
{
if (!map || !size)
return;
early_memunmap(map, size);
}
void __iomem *acpi_os_ioremap(acpi_physical_address phys, acpi_size size)
{
if (!memblock_is_memory(phys))
return ioremap(phys, size);
else
return ioremap_cache(phys, size);
}
#ifdef CONFIG_SMP
static int set_processor_mask(u32 id, u32 pass)
{
int cpu = -1, cpuid = id;
if (num_processors >= NR_CPUS) {
pr_warn(PREFIX "nr_cpus limit of %i reached."
" processor 0x%x ignored.\n", NR_CPUS, cpuid);
return -ENODEV;
}
if (cpuid == loongson_sysconf.boot_cpu_id)
cpu = 0;
switch (pass) {
case 1: /* Pass 1 handle enabled processors */
if (cpu < 0)
cpu = find_first_zero_bit(cpumask_bits(cpu_present_mask), NR_CPUS);
num_processors++;
set_cpu_present(cpu, true);
break;
case 2: /* Pass 2 handle disabled processors */
if (cpu < 0)
cpu = find_first_zero_bit(cpumask_bits(cpu_possible_mask), NR_CPUS);
disabled_cpus++;
break;
default:
return cpu;
}
set_cpu_possible(cpu, true);
__cpu_number_map[cpuid] = cpu;
__cpu_logical_map[cpu] = cpuid;
return cpu;
}
#endif
static int __init
acpi_parse_p1_processor(union acpi_subtable_headers *header, const unsigned long end)
{
struct acpi_madt_core_pic *processor = NULL;
processor = (struct acpi_madt_core_pic *)header;
if (BAD_MADT_ENTRY(processor, end))
return -EINVAL;
acpi_table_print_madt_entry(&header->common);
#ifdef CONFIG_SMP
acpi_core_pic[processor->core_id] = *processor;
if (processor->flags & ACPI_MADT_ENABLED)
set_processor_mask(processor->core_id, 1);
#endif
return 0;
}
static int __init
acpi_parse_p2_processor(union acpi_subtable_headers *header, const unsigned long end)
{
struct acpi_madt_core_pic *processor = NULL;
processor = (struct acpi_madt_core_pic *)header;
if (BAD_MADT_ENTRY(processor, end))
return -EINVAL;
#ifdef CONFIG_SMP
if (!(processor->flags & ACPI_MADT_ENABLED))
set_processor_mask(processor->core_id, 2);
#endif
return 0;
}
static int __init
acpi_parse_eio_master(union acpi_subtable_headers *header, const unsigned long end)
{
static int core = 0;
struct acpi_madt_eio_pic *eiointc = NULL;
eiointc = (struct acpi_madt_eio_pic *)header;
if (BAD_MADT_ENTRY(eiointc, end))
return -EINVAL;
core = eiointc->node * CORES_PER_EIO_NODE;
set_bit(core, loongson_sysconf.cores_io_master);
return 0;
}
static void __init acpi_process_madt(void)
{
#ifdef CONFIG_SMP
int i;
for (i = 0; i < NR_CPUS; i++) {
__cpu_number_map[i] = -1;
__cpu_logical_map[i] = -1;
}
#endif
acpi_table_parse_madt(ACPI_MADT_TYPE_CORE_PIC,
acpi_parse_p1_processor, MAX_CORE_PIC);
acpi_table_parse_madt(ACPI_MADT_TYPE_CORE_PIC,
acpi_parse_p2_processor, MAX_CORE_PIC);
acpi_table_parse_madt(ACPI_MADT_TYPE_EIO_PIC,
acpi_parse_eio_master, MAX_IO_PICS);
loongson_sysconf.nr_cpus = num_processors;
}
int pptt_enabled;
int __init parse_acpi_topology(void)
{
int cpu, topology_id;
for_each_possible_cpu(cpu) {
topology_id = find_acpi_cpu_topology(cpu, 0);
if (topology_id < 0) {
pr_warn("Invalid BIOS PPTT\n");
return -ENOENT;
}
if (acpi_pptt_cpu_is_thread(cpu) <= 0)
cpu_data[cpu].core = topology_id;
else {
topology_id = find_acpi_cpu_topology(cpu, 1);
if (topology_id < 0)
return -ENOENT;
cpu_data[cpu].core = topology_id;
}
}
pptt_enabled = 1;
return 0;
}
#ifndef CONFIG_SUSPEND
int (*acpi_suspend_lowlevel)(void);
#else
int (*acpi_suspend_lowlevel)(void) = loongarch_acpi_suspend;
#endif
void __init acpi_boot_table_init(void)
{
/*
* If acpi_disabled, bail out
*/
if (acpi_disabled)
goto fdt_earlycon;
/*
* Initialize the ACPI boot-time table parser.
*/
if (acpi_table_init()) {
disable_acpi();
goto fdt_earlycon;
}
loongson_sysconf.boot_cpu_id = read_csr_cpuid();
/*
* Process the Multiple APIC Description Table (MADT), if present
*/
acpi_process_madt();
/* Do not enable ACPI SPCR console by default */
acpi_parse_spcr(earlycon_acpi_spcr_enable, false);
if (IS_ENABLED(CONFIG_ACPI_BGRT))
acpi_table_parse(ACPI_SIG_BGRT, acpi_parse_bgrt);
return;
fdt_earlycon:
if (earlycon_acpi_spcr_enable)
early_init_dt_scan_chosen_stdout();
}
#ifdef CONFIG_ACPI_NUMA
static __init int setup_node(int pxm)
{
return acpi_map_pxm_to_node(pxm);
}
/*
* Callback for SLIT parsing. pxm_to_node() returns NUMA_NO_NODE for
* I/O localities since SRAT does not list them. I/O localities are
* not supported at this point.
*/
unsigned int numa_distance_cnt;
static inline unsigned int get_numa_distances_cnt(struct acpi_table_slit *slit)
{
return slit->locality_count;
}
void __init numa_set_distance(int from, int to, int distance)
{
if ((u8)distance != distance || (from == to && distance != LOCAL_DISTANCE)) {
pr_warn_once("Warning: invalid distance parameter, from=%d to=%d distance=%d\n",
from, to, distance);
return;
}
node_distances[from][to] = distance;
}
/* Callback for Proximity Domain -> CPUID mapping */
void __init
acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
{
int pxm, node;
if (srat_disabled())
return;
if (pa->header.length != sizeof(struct acpi_srat_cpu_affinity)) {
bad_srat();
return;
}
if ((pa->flags & ACPI_SRAT_CPU_ENABLED) == 0)
return;
pxm = pa->proximity_domain_lo;
if (acpi_srat_revision >= 2) {
pxm |= (pa->proximity_domain_hi[0] << 8);
pxm |= (pa->proximity_domain_hi[1] << 16);
pxm |= (pa->proximity_domain_hi[2] << 24);
}
node = setup_node(pxm);
if (node < 0) {
pr_err("SRAT: Too many proximity domains %x\n", pxm);
bad_srat();
return;
}
if (pa->apic_id >= CONFIG_NR_CPUS) {
pr_info("SRAT: PXM %u -> CPU 0x%02x -> Node %u skipped apicid that is too big\n",
pxm, pa->apic_id, node);
return;
}
early_numa_add_cpu(pa->apic_id, node);
set_cpuid_to_node(pa->apic_id, node);
node_set(node, numa_nodes_parsed);
pr_info("SRAT: PXM %u -> CPU 0x%02x -> Node %u\n", pxm, pa->apic_id, node);
}
#endif
void __init arch_reserve_mem_area(acpi_physical_address addr, size_t size)
{
memblock_reserve(addr, size);
}
#ifdef CONFIG_ACPI_HOTPLUG_CPU
#include <acpi/processor.h>
static int __ref acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
{
#ifdef CONFIG_ACPI_NUMA
int nid;
nid = acpi_get_node(handle);
if (nid != NUMA_NO_NODE)
nid = early_cpu_to_node(cpu);
if (nid != NUMA_NO_NODE) {
set_cpuid_to_node(physid, nid);
node_set(nid, numa_nodes_parsed);
set_cpu_numa_node(cpu, nid);
cpumask_set_cpu(cpu, cpumask_of_node(nid));
}
#endif
return 0;
}
int acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, u32 acpi_id, int *pcpu)
{
int cpu;
cpu = cpu_number_map(physid);
if (cpu < 0 || cpu >= nr_cpu_ids) {
pr_info(PREFIX "Unable to map lapic to logical cpu number\n");
return -ERANGE;
}
num_processors++;
set_cpu_present(cpu, true);
acpi_map_cpu2node(handle, cpu, physid);
*pcpu = cpu;
return 0;
}
EXPORT_SYMBOL(acpi_map_cpu);
int acpi_unmap_cpu(int cpu)
{
#ifdef CONFIG_ACPI_NUMA
set_cpuid_to_node(cpu_logical_map(cpu), NUMA_NO_NODE);
#endif
set_cpu_present(cpu, false);
num_processors--;
pr_info("cpu%d hot remove!\n", cpu);
return 0;
}
EXPORT_SYMBOL(acpi_unmap_cpu);
#endif /* CONFIG_ACPI_HOTPLUG_CPU */