6.11-stable review patch. If anyone has any objections, please let me know.
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From: Huacai Chen chenhuacai@loongson.cn
[ Upstream commit a6654a40a852a4ca18aacced4cf5ca87997818d7 ]
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 Signed-off-by: Sasha Levin sashal@kernel.org --- arch/loongarch/kernel/acpi.c | 81 +++++++++++++++++++++++------------- arch/loongarch/kernel/smp.c | 3 +- 2 files changed, 55 insertions(+), 29 deletions(-)
diff --git a/arch/loongarch/kernel/acpi.c b/arch/loongarch/kernel/acpi.c index 929a497c987e8..de9e34414e614 100644 --- a/arch/loongarch/kernel/acpi.c +++ b/arch/loongarch/kernel/acpi.c @@ -57,48 +57,48 @@ void __iomem *acpi_os_ioremap(acpi_physical_address phys, acpi_size size) return ioremap_cache(phys, size); }
-static int cpu_enumerated = 0; - #ifdef CONFIG_SMP -static int set_processor_mask(u32 id, u32 flags) +static int set_processor_mask(u32 id, u32 pass) { - int nr_cpus; - int cpu, cpuid = id; - - if (!cpu_enumerated) - nr_cpus = NR_CPUS; - else - nr_cpus = nr_cpu_ids; + int cpu = -1, cpuid = id;
- if (num_processors >= nr_cpus) { + if (num_processors >= NR_CPUS) { pr_warn(PREFIX "nr_cpus limit of %i reached." - " processor 0x%x ignored.\n", nr_cpus, cpuid); + " processor 0x%x ignored.\n", NR_CPUS, cpuid);
return -ENODEV;
} + if (cpuid == loongson_sysconf.boot_cpu_id) cpu = 0; - else - cpu = find_first_zero_bit(cpumask_bits(cpu_present_mask), NR_CPUS); - - if (!cpu_enumerated) - set_cpu_possible(cpu, true);
- if (flags & ACPI_MADT_ENABLED) { + 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); - __cpu_number_map[cpuid] = cpu; - __cpu_logical_map[cpu] = cpuid; - } else + 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_processor(union acpi_subtable_headers *header, const unsigned long end) +acpi_parse_p1_processor(union acpi_subtable_headers *header, const unsigned long end) { struct acpi_madt_core_pic *processor = NULL;
@@ -109,12 +109,29 @@ acpi_parse_processor(union acpi_subtable_headers *header, const unsigned long en acpi_table_print_madt_entry(&header->common); #ifdef CONFIG_SMP acpi_core_pic[processor->core_id] = *processor; - set_processor_mask(processor->core_id, processor->flags); + 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) { @@ -142,12 +159,14 @@ static void __init acpi_process_madt(void) } #endif acpi_table_parse_madt(ACPI_MADT_TYPE_CORE_PIC, - acpi_parse_processor, MAX_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);
- cpu_enumerated = 1; loongson_sysconf.nr_cpus = num_processors; }
@@ -306,6 +325,10 @@ static int __ref acpi_map_cpu2node(acpi_handle handle, int cpu, int physid) 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); @@ -320,12 +343,14 @@ int acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, u32 acpi_id, int *pcpu { int cpu;
- cpu = set_processor_mask(physid, ACPI_MADT_ENABLED); - if (cpu < 0) { + 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 cpu; + return -ERANGE; }
+ num_processors++; + set_cpu_present(cpu, true); acpi_map_cpu2node(handle, cpu, physid);
*pcpu = cpu; diff --git a/arch/loongarch/kernel/smp.c b/arch/loongarch/kernel/smp.c index b1329fe01fae9..5a8cb31a4e6b7 100644 --- a/arch/loongarch/kernel/smp.c +++ b/arch/loongarch/kernel/smp.c @@ -325,11 +325,11 @@ void __init loongson_prepare_cpus(unsigned int max_cpus) int i = 0;
parse_acpi_topology(); + cpu_data[0].global_id = cpu_logical_map(0);
for (i = 0; i < loongson_sysconf.nr_cpus; i++) { set_cpu_present(i, true); csr_mail_send(0, __cpu_logical_map[i], 0); - cpu_data[i].global_id = __cpu_logical_map[i]; }
per_cpu(cpu_state, smp_processor_id()) = CPU_ONLINE; @@ -374,6 +374,7 @@ void loongson_init_secondary(void) cpu_logical_map(cpu) / loongson_sysconf.cores_per_package; cpu_data[cpu].core = pptt_enabled ? cpu_data[cpu].core : cpu_logical_map(cpu) % loongson_sysconf.cores_per_package; + cpu_data[cpu].global_id = cpu_logical_map(cpu); }
void loongson_smp_finish(void)