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Paranoia is not wrong, but having an APIC callback which is in most implementations a complete NOOP and in one actually looking whether the APICID of an upcoming CPU has been registered. The same APICID which was used to bring the CPU out of wait for startup. That's paranoia for the paranoia sake. Remove the voodoo. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Tested-by: Michael Kelley <mhklinux@outlook.com> Tested-by: Sohil Mehta <sohil.mehta@intel.com> Link: https://lore.kernel.org/r/20240212154640.116510935@linutronix.de
43 lines
889 B
C
43 lines
889 B
C
/*
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* Common functions shared between the various APIC flavours
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*
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* SPDX-License-Identifier: GPL-2.0
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*/
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#include <linux/irq.h>
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#include <asm/apic.h>
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#include "local.h"
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u32 apic_default_calc_apicid(unsigned int cpu)
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{
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return per_cpu(x86_cpu_to_apicid, cpu);
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}
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u32 apic_flat_calc_apicid(unsigned int cpu)
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{
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return 1U << cpu;
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}
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u32 default_cpu_present_to_apicid(int mps_cpu)
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{
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if (mps_cpu < nr_cpu_ids && cpu_present(mps_cpu))
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return (int)per_cpu(x86_cpu_to_apicid, mps_cpu);
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else
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return BAD_APICID;
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}
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EXPORT_SYMBOL_GPL(default_cpu_present_to_apicid);
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/*
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* Set up the logical destination ID when the APIC operates in logical
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* destination mode.
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*/
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void default_init_apic_ldr(void)
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{
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unsigned long val;
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apic_write(APIC_DFR, APIC_DFR_FLAT);
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val = apic_read(APIC_LDR) & ~APIC_LDR_MASK;
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val |= SET_APIC_LOGICAL_ID(1UL << smp_processor_id());
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apic_write(APIC_LDR, val);
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}
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