2a43195d83
Add eoi_write callback so that kvm can override eoi accesses without touching the rest of the apic. As a side-effect, this will enable a micro-optimization for apics using msr. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Cc: Avi Kivity <avi@redhat.com> Cc: Marcelo Tosatti <mtosatti@redhat.com> Cc: gleb@redhat.com Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: http://lkml.kernel.org/r/0df425d746c49ac2ecc405174df87752869629d2.1337184153.git.mst@redhat.com [ tidied it up a bit ] Signed-off-by: Ingo Molnar <mingo@kernel.org>
272 lines
6.6 KiB
C
272 lines
6.6 KiB
C
/*
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* Default generic APIC driver. This handles up to 8 CPUs.
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*
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* Copyright 2003 Andi Kleen, SuSE Labs.
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* Subject to the GNU Public License, v.2
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*
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* Generic x86 APIC driver probe layer.
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*/
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#include <linux/threads.h>
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#include <linux/cpumask.h>
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/kernel.h>
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#include <linux/ctype.h>
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#include <linux/init.h>
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#include <linux/errno.h>
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#include <asm/fixmap.h>
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#include <asm/mpspec.h>
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#include <asm/apicdef.h>
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#include <asm/apic.h>
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#include <asm/setup.h>
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#include <linux/smp.h>
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#include <asm/ipi.h>
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#include <linux/interrupt.h>
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#include <asm/acpi.h>
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#include <asm/e820.h>
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#ifdef CONFIG_HOTPLUG_CPU
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#define DEFAULT_SEND_IPI (1)
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#else
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#define DEFAULT_SEND_IPI (0)
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#endif
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int no_broadcast = DEFAULT_SEND_IPI;
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static __init int no_ipi_broadcast(char *str)
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{
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get_option(&str, &no_broadcast);
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pr_info("Using %s mode\n",
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no_broadcast ? "No IPI Broadcast" : "IPI Broadcast");
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return 1;
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}
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__setup("no_ipi_broadcast=", no_ipi_broadcast);
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static int __init print_ipi_mode(void)
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{
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pr_info("Using IPI %s mode\n",
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no_broadcast ? "No-Shortcut" : "Shortcut");
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return 0;
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}
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late_initcall(print_ipi_mode);
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static int default_x86_32_early_logical_apicid(int cpu)
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{
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return 1 << cpu;
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}
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static void setup_apic_flat_routing(void)
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{
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#ifdef CONFIG_X86_IO_APIC
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printk(KERN_INFO
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"Enabling APIC mode: Flat. Using %d I/O APICs\n",
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nr_ioapics);
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#endif
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}
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static void default_vector_allocation_domain(int cpu, struct cpumask *retmask)
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{
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/*
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* Careful. Some cpus do not strictly honor the set of cpus
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* specified in the interrupt destination when using lowest
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* priority interrupt delivery mode.
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*
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* In particular there was a hyperthreading cpu observed to
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* deliver interrupts to the wrong hyperthread when only one
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* hyperthread was specified in the interrupt desitination.
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*/
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cpumask_clear(retmask);
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cpumask_bits(retmask)[0] = APIC_ALL_CPUS;
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}
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/* should be called last. */
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static int probe_default(void)
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{
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return 1;
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}
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static struct apic apic_default = {
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.name = "default",
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.probe = probe_default,
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.acpi_madt_oem_check = NULL,
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.apic_id_valid = default_apic_id_valid,
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.apic_id_registered = default_apic_id_registered,
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.irq_delivery_mode = dest_LowestPrio,
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/* logical delivery broadcast to all CPUs: */
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.irq_dest_mode = 1,
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.target_cpus = default_target_cpus,
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.disable_esr = 0,
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.dest_logical = APIC_DEST_LOGICAL,
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.check_apicid_used = default_check_apicid_used,
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.check_apicid_present = default_check_apicid_present,
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.vector_allocation_domain = default_vector_allocation_domain,
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.init_apic_ldr = default_init_apic_ldr,
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.ioapic_phys_id_map = default_ioapic_phys_id_map,
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.setup_apic_routing = setup_apic_flat_routing,
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.multi_timer_check = NULL,
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.cpu_present_to_apicid = default_cpu_present_to_apicid,
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.apicid_to_cpu_present = physid_set_mask_of_physid,
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.setup_portio_remap = NULL,
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.check_phys_apicid_present = default_check_phys_apicid_present,
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.enable_apic_mode = NULL,
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.phys_pkg_id = default_phys_pkg_id,
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.mps_oem_check = NULL,
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.get_apic_id = default_get_apic_id,
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.set_apic_id = NULL,
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.apic_id_mask = 0x0F << 24,
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.cpu_mask_to_apicid = default_cpu_mask_to_apicid,
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.cpu_mask_to_apicid_and = default_cpu_mask_to_apicid_and,
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.send_IPI_mask = default_send_IPI_mask_logical,
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.send_IPI_mask_allbutself = default_send_IPI_mask_allbutself_logical,
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.send_IPI_allbutself = default_send_IPI_allbutself,
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.send_IPI_all = default_send_IPI_all,
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.send_IPI_self = default_send_IPI_self,
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.trampoline_phys_low = DEFAULT_TRAMPOLINE_PHYS_LOW,
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.trampoline_phys_high = DEFAULT_TRAMPOLINE_PHYS_HIGH,
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.wait_for_init_deassert = default_wait_for_init_deassert,
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.smp_callin_clear_local_apic = NULL,
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.inquire_remote_apic = default_inquire_remote_apic,
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.read = native_apic_mem_read,
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.write = native_apic_mem_write,
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.eoi_write = native_apic_mem_write,
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.icr_read = native_apic_icr_read,
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.icr_write = native_apic_icr_write,
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.wait_icr_idle = native_apic_wait_icr_idle,
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.safe_wait_icr_idle = native_safe_apic_wait_icr_idle,
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.x86_32_early_logical_apicid = default_x86_32_early_logical_apicid,
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};
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apic_driver(apic_default);
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struct apic *apic = &apic_default;
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EXPORT_SYMBOL_GPL(apic);
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static int cmdline_apic __initdata;
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static int __init parse_apic(char *arg)
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{
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struct apic **drv;
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if (!arg)
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return -EINVAL;
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for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
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if (!strcmp((*drv)->name, arg)) {
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apic = *drv;
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cmdline_apic = 1;
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return 0;
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}
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}
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/* Parsed again by __setup for debug/verbose */
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return 0;
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}
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early_param("apic", parse_apic);
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void __init default_setup_apic_routing(void)
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{
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int version = apic_version[boot_cpu_physical_apicid];
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if (num_possible_cpus() > 8) {
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switch (boot_cpu_data.x86_vendor) {
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case X86_VENDOR_INTEL:
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if (!APIC_XAPIC(version)) {
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def_to_bigsmp = 0;
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break;
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}
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/* If P4 and above fall through */
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case X86_VENDOR_AMD:
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def_to_bigsmp = 1;
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}
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}
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#ifdef CONFIG_X86_BIGSMP
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/*
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* This is used to switch to bigsmp mode when
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* - There is no apic= option specified by the user
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* - generic_apic_probe() has chosen apic_default as the sub_arch
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* - we find more than 8 CPUs in acpi LAPIC listing with xAPIC support
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*/
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if (!cmdline_apic && apic == &apic_default)
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generic_bigsmp_probe();
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#endif
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if (apic->setup_apic_routing)
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apic->setup_apic_routing();
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}
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void __init generic_apic_probe(void)
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{
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if (!cmdline_apic) {
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struct apic **drv;
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for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
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if ((*drv)->probe()) {
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apic = *drv;
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break;
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}
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}
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/* Not visible without early console */
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if (drv == __apicdrivers_end)
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panic("Didn't find an APIC driver");
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}
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printk(KERN_INFO "Using APIC driver %s\n", apic->name);
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}
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/* These functions can switch the APIC even after the initial ->probe() */
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int __init
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generic_mps_oem_check(struct mpc_table *mpc, char *oem, char *productid)
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{
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struct apic **drv;
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for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
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if (!((*drv)->mps_oem_check))
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continue;
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if (!(*drv)->mps_oem_check(mpc, oem, productid))
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continue;
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if (!cmdline_apic) {
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apic = *drv;
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printk(KERN_INFO "Switched to APIC driver `%s'.\n",
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apic->name);
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}
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return 1;
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}
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return 0;
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}
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int __init default_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
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{
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struct apic **drv;
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for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
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if (!(*drv)->acpi_madt_oem_check)
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continue;
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if (!(*drv)->acpi_madt_oem_check(oem_id, oem_table_id))
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continue;
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if (!cmdline_apic) {
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apic = *drv;
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printk(KERN_INFO "Switched to APIC driver `%s'.\n",
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apic->name);
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}
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return 1;
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}
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return 0;
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}
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