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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