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e7b6a023d2
Move it next to apic_mem_wait_icr_idle(), rename it so that it's clear what it does and rewrite it in readable form. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Tested-by: Michael Kelley <mikelley@microsoft.com> Tested-by: Sohil Mehta <sohil.mehta@intel.com> Tested-by: Juergen Gross <jgross@suse.com> # Xen PV (dom0 and unpriv. guest)
143 lines
3.2 KiB
C
143 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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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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*
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* Generic x86 APIC driver probe layer.
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*/
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#include <linux/export.h>
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#include <linux/errno.h>
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#include <linux/smp.h>
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#include <xen/xen.h>
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#include <asm/io_apic.h>
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#include <asm/apic.h>
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#include <asm/acpi.h>
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#include "local.h"
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static int default_phys_pkg_id(int cpuid_apic, int index_msb)
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{
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return cpuid_apic >> index_msb;
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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 __ro_after_init = {
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.name = "default",
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.probe = probe_default,
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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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.delivery_mode = APIC_DELIVERY_MODE_FIXED,
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.dest_mode_logical = true,
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.disable_esr = 0,
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.check_apicid_used = default_check_apicid_used,
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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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.cpu_present_to_apicid = default_cpu_present_to_apicid,
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.phys_pkg_id = default_phys_pkg_id,
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.get_apic_id = default_get_apic_id,
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.set_apic_id = NULL,
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.calc_dest_apicid = apic_flat_calc_apicid,
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.send_IPI = default_send_IPI_single,
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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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.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 = apic_mem_wait_icr_idle,
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.safe_wait_icr_idle = apic_mem_wait_icr_idle_timeout,
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};
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apic_driver(apic_default);
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struct apic *apic __ro_after_init = &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 x86_32_probe_bigsmp_early(void)
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{
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if (nr_cpu_ids <= 8 || xen_pv_domain())
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return;
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if (IS_ENABLED(CONFIG_X86_BIGSMP)) {
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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(boot_cpu_apic_version))
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break;
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/* P4 and above */
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fallthrough;
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case X86_VENDOR_HYGON:
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case X86_VENDOR_AMD:
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if (apic_bigsmp_possible(cmdline_apic))
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return;
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break;
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}
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}
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pr_info("Limiting to 8 possible CPUs\n");
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set_nr_cpu_ids(8);
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}
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void __init x86_32_install_bigsmp(void)
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{
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if (nr_cpu_ids > 8 && !xen_pv_domain())
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apic_bigsmp_force();
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}
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void __init x86_32_probe_apic(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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