diff options
Diffstat (limited to 'arch/x86/kernel/apic/apic.c')
| -rw-r--r-- | arch/x86/kernel/apic/apic.c | 207 |
1 files changed, 4 insertions, 203 deletions
diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c index a04a5163e56c..803dcfb0e346 100644 --- a/arch/x86/kernel/apic/apic.c +++ b/arch/x86/kernel/apic/apic.c @@ -19,6 +19,7 @@ #include <linux/kernel_stat.h> #include <linux/mc146818rtc.h> #include <linux/acpi_pmtmr.h> +#include <linux/bitmap.h> #include <linux/clockchips.h> #include <linux/interrupt.h> #include <linux/memblock.h> @@ -67,10 +68,6 @@ #include "local.h" -unsigned int num_processors; - -unsigned disabled_cpus; - /* Processor that is doing the boot up */ u32 boot_cpu_physical_apicid __ro_after_init = BAD_APICID; EXPORT_SYMBOL_GPL(boot_cpu_physical_apicid); @@ -78,18 +75,6 @@ EXPORT_SYMBOL_GPL(boot_cpu_physical_apicid); u8 boot_cpu_apic_version __ro_after_init; /* - * Bitmask of physically existing CPUs: - */ -physid_mask_t phys_cpu_present_map; - -/* - * Processor to be disabled specified by kernel parameter - * disable_cpu_apicid=<int>, mostly used for the kdump 2nd kernel to - * avoid undefined behaviour caused by sending INIT from AP to BSP. - */ -static u32 disabled_cpu_apicid __ro_after_init = BAD_APICID; - -/* * This variable controls which CPUs receive external NMIs. By default, * external NMIs are delivered only to the BSP. */ @@ -108,14 +93,6 @@ static inline bool apic_accessible(void) return x2apic_mode || apic_mmio_base; } -/* - * Map cpu index to physical APIC ID - */ -DEFINE_EARLY_PER_CPU_READ_MOSTLY(u32, x86_cpu_to_apicid, BAD_APICID); -DEFINE_EARLY_PER_CPU_READ_MOSTLY(u32, x86_cpu_to_acpiid, U32_MAX); -EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_apicid); -EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_acpiid); - #ifdef CONFIG_X86_32 /* Local APIC was disabled by the BIOS and enabled by the kernel */ static int enabled_via_apicbase __ro_after_init; @@ -261,16 +238,6 @@ u64 native_apic_icr_read(void) return icr1 | ((u64)icr2 << 32); } -#ifdef CONFIG_X86_32 -/** - * get_physical_broadcast - Get number of physical broadcast IDs - */ -int get_physical_broadcast(void) -{ - return modern_apic() ? 0xff : 0xf; -} -#endif - /** * lapic_get_maxlvt - get the maximum number of local vector table entries */ @@ -1549,9 +1516,6 @@ static void setup_local_APIC(void) apic_write(APIC_ESR, 0); } #endif - /* Validate that the APIC is registered if required */ - BUG_ON(apic->apic_id_registered && !apic->apic_id_registered()); - /* * Intel recommends to set DFR, LDR and TPR before enabling * an APIC. See e.g. "AP-388 82489DX User's Manual" (Intel @@ -1690,8 +1654,6 @@ void apic_ap_setup(void) end_local_APIC_setup(); } -static __init void cpu_set_boot_apic(void); - static __init void apic_read_boot_cpu_id(bool x2apic) { /* @@ -1706,7 +1668,8 @@ static __init void apic_read_boot_cpu_id(bool x2apic) boot_cpu_physical_apicid = read_apic_id(); boot_cpu_apic_version = GET_APIC_VERSION(apic_read(APIC_LVR)); } - cpu_set_boot_apic(); + topology_register_boot_apic(boot_cpu_physical_apicid); + x86_32_probe_bigsmp_early(); } #ifdef CONFIG_X86_X2APIC @@ -2096,7 +2059,6 @@ void __init init_apic_mappings(void) pr_info("APIC: disable apic facility\n"); apic_disable(); } - num_processors = 1; } } @@ -2311,155 +2273,6 @@ void disconnect_bsp_APIC(int virt_wire_setup) apic_write(APIC_LVT1, value); } -/* - * The number of allocated logical CPU IDs. Since logical CPU IDs are allocated - * contiguously, it equals to current allocated max logical CPU ID plus 1. - * All allocated CPU IDs should be in the [0, nr_logical_cpuids) range, - * so the maximum of nr_logical_cpuids is nr_cpu_ids. - * - * NOTE: Reserve 0 for BSP. - */ -static int nr_logical_cpuids = 1; - -/* - * Used to store mapping between logical CPU IDs and APIC IDs. - */ -u32 cpuid_to_apicid[] = { [0 ... NR_CPUS - 1] = BAD_APICID, }; - -bool arch_match_cpu_phys_id(int cpu, u64 phys_id) -{ - return phys_id == (u64)cpuid_to_apicid[cpu]; -} - -#ifdef CONFIG_SMP -static void cpu_mark_primary_thread(unsigned int cpu, unsigned int apicid) -{ - /* Isolate the SMT bit(s) in the APICID and check for 0 */ - u32 mask = (1U << (fls(smp_num_siblings) - 1)) - 1; - - if (smp_num_siblings == 1 || !(apicid & mask)) - cpumask_set_cpu(cpu, &__cpu_primary_thread_mask); -} - -/* - * Due to the utter mess of CPUID evaluation smp_num_siblings is not valid - * during early boot. Initialize the primary thread mask before SMP - * bringup. - */ -static int __init smp_init_primary_thread_mask(void) -{ - unsigned int cpu; - - /* - * XEN/PV provides either none or useless topology information. - * Pretend that all vCPUs are primary threads. - */ - if (xen_pv_domain()) { - cpumask_copy(&__cpu_primary_thread_mask, cpu_possible_mask); - return 0; - } - - for (cpu = 0; cpu < nr_logical_cpuids; cpu++) - cpu_mark_primary_thread(cpu, cpuid_to_apicid[cpu]); - return 0; -} -early_initcall(smp_init_primary_thread_mask); -#else -static inline void cpu_mark_primary_thread(unsigned int cpu, unsigned int apicid) { } -#endif - -/* - * Should use this API to allocate logical CPU IDs to keep nr_logical_cpuids - * and cpuid_to_apicid[] synchronized. - */ -static int allocate_logical_cpuid(int apicid) -{ - int i; - - /* - * cpuid <-> apicid mapping is persistent, so when a cpu is up, - * check if the kernel has allocated a cpuid for it. - */ - for (i = 0; i < nr_logical_cpuids; i++) { - if (cpuid_to_apicid[i] == apicid) - return i; - } - - /* Allocate a new cpuid. */ - if (nr_logical_cpuids >= nr_cpu_ids) { - WARN_ONCE(1, "APIC: NR_CPUS/possible_cpus limit of %u reached. " - "Processor %d/0x%x and the rest are ignored.\n", - nr_cpu_ids, nr_logical_cpuids, apicid); - return -EINVAL; - } - - cpuid_to_apicid[nr_logical_cpuids] = apicid; - return nr_logical_cpuids++; -} - -static void cpu_update_apic(int cpu, u32 apicid) -{ -#if defined(CONFIG_SMP) || defined(CONFIG_X86_64) - early_per_cpu(x86_cpu_to_apicid, cpu) = apicid; -#endif - set_cpu_possible(cpu, true); - physid_set(apicid, phys_cpu_present_map); - set_cpu_present(cpu, true); - num_processors++; - - if (system_state != SYSTEM_BOOTING) - cpu_mark_primary_thread(cpu, apicid); -} - -static __init void cpu_set_boot_apic(void) -{ - cpuid_to_apicid[0] = boot_cpu_physical_apicid; - cpu_update_apic(0, boot_cpu_physical_apicid); - x86_32_probe_bigsmp_early(); -} - -int generic_processor_info(int apicid) -{ - int cpu, max = nr_cpu_ids; - - /* The boot CPU must be set before MADT/MPTABLE parsing happens */ - if (cpuid_to_apicid[0] == BAD_APICID) - panic("Boot CPU APIC not registered yet\n"); - - if (apicid == boot_cpu_physical_apicid) - return 0; - - if (disabled_cpu_apicid == apicid) { - int thiscpu = num_processors + disabled_cpus; - - pr_warn("APIC: Disabling requested cpu. Processor %d/0x%x ignored.\n", - thiscpu, apicid); - - disabled_cpus++; - return -ENODEV; - } - - if (num_processors >= nr_cpu_ids) { - int thiscpu = max + disabled_cpus; - - pr_warn("APIC: NR_CPUS/possible_cpus limit of %i reached. " - "Processor %d/0x%x ignored.\n", max, thiscpu, apicid); - - disabled_cpus++; - return -EINVAL; - } - - cpu = allocate_logical_cpuid(apicid); - if (cpu < 0) { - disabled_cpus++; - return -EINVAL; - } - - cpu_update_apic(cpu, apicid); - return cpu; -} - - void __irq_msi_compose_msg(struct irq_cfg *cfg, struct msi_msg *msg, bool dmar) { @@ -2502,10 +2315,7 @@ EXPORT_SYMBOL_GPL(x86_msi_msg_get_destid); static void __init apic_bsp_up_setup(void) { -#ifdef CONFIG_X86_64 - apic_write(APIC_ID, apic->set_apic_id(boot_cpu_physical_apicid)); -#endif - physid_set_mask_of_physid(boot_cpu_physical_apicid, &phys_cpu_present_map); + reset_phys_cpu_present_map(boot_cpu_physical_apicid); } /** @@ -2851,15 +2661,6 @@ static int __init lapic_insert_resource(void) */ late_initcall(lapic_insert_resource); -static int __init apic_set_disabled_cpu_apicid(char *arg) -{ - if (!arg || !get_option(&arg, &disabled_cpu_apicid)) - return -EINVAL; - - return 0; -} -early_param("disable_cpu_apicid", apic_set_disabled_cpu_apicid); - static int __init apic_set_extnmi(char *arg) { if (!arg) |