Date: Fri, 7 Aug 2020 00:33:28 +0000 (UTC) From: Alexander Motin <mav@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-12@freebsd.org Subject: svn commit: r363999 - in stable/12/sys/x86: include x86 Message-ID: <202008070033.0770XShW054768@repo.freebsd.org>
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Author: mav Date: Fri Aug 7 00:33:28 2020 New Revision: 363999 URL: https://svnweb.freebsd.org/changeset/base/363999 Log: MFC r363495: Introduce ipi_self_from_nmi(). It allows safe IPI sending to current CPU from NMI context. Unlike other ipi_*() functions this waits for delivery to leave LAPIC in a state safe for interrupted code. Modified: stable/12/sys/x86/include/x86_smp.h stable/12/sys/x86/x86/mp_x86.c Directory Properties: stable/12/ (props changed) Modified: stable/12/sys/x86/include/x86_smp.h ============================================================================== --- stable/12/sys/x86/include/x86_smp.h Fri Aug 7 00:26:16 2020 (r363998) +++ stable/12/sys/x86/include/x86_smp.h Fri Aug 7 00:33:28 2020 (r363999) @@ -101,6 +101,7 @@ void ipi_bitmap_handler(struct trapframe frame); void ipi_cpu(int cpu, u_int ipi); int ipi_nmi_handler(void); void ipi_selected(cpuset_t cpus, u_int ipi); +void ipi_self_from_nmi(u_int vector); void set_interrupt_apic_ids(void); void smp_cache_flush(smp_invl_cb_t curcpu_cb); void smp_masked_invlpg(cpuset_t mask, vm_offset_t addr, struct pmap *pmap, Modified: stable/12/sys/x86/x86/mp_x86.c ============================================================================== --- stable/12/sys/x86/x86/mp_x86.c Fri Aug 7 00:26:16 2020 (r363998) +++ stable/12/sys/x86/x86/mp_x86.c Fri Aug 7 00:33:28 2020 (r363999) @@ -1350,6 +1350,21 @@ ipi_all_but_self(u_int ipi) lapic_ipi_vectored(ipi, APIC_IPI_DEST_OTHERS); } +void +ipi_self_from_nmi(u_int vector) +{ + + lapic_ipi_vectored(vector, APIC_IPI_DEST_SELF); + + /* Wait for IPI to finish. */ + if (!lapic_ipi_wait(50000)) { + if (KERNEL_PANICKED()) + return; + else + panic("APIC: IPI is stuck"); + } +} + int ipi_nmi_handler(void) {
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