Author: mav
Date: Fri Jul 24 20:52:09 2020
New Revision: 363495
URL: https://svnweb.freebsd.org/changeset/base/363495
Log:
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.
MFC after: 2 weeks
Sponsored by: iXsystems, Inc.
Modified:
head/sys/x86/include/x86_smp.h
head/sys/x86/x86/mp_x86.c
Modified: head/sys/x86/include/x86_smp.h
==============================================================================
--- head/sys/x86/include/x86_smp.h Fri Jul 24 20:48:06 2020
(r363494)
+++ head/sys/x86/include/x86_smp.h Fri Jul 24 20:52:09 2020
(r363495)
@@ -97,6 +97,7 @@ 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: head/sys/x86/x86/mp_x86.c
==============================================================================
--- head/sys/x86/x86/mp_x86.c Fri Jul 24 20:48:06 2020 (r363494)
+++ head/sys/x86/x86/mp_x86.c Fri Jul 24 20:52:09 2020 (r363495)
@@ -1398,6 +1398,21 @@ 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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