Drivers: hv: vmbus: Implement Direct Mode for stimer0

The 2016 version of Hyper-V offers the option to operate the guest VM
per-vcpu stimer's in Direct Mode, which means the timer interupts on its
own vector rather than queueing a VMbus message. Direct Mode reduces
timer processing overhead in both the hypervisor and the guest, and
avoids having timer interrupts pollute the VMbus interrupt stream for
the synthetic NIC and storage.  This patch enables Direct Mode by
default on stimer0 when running on a version of Hyper-V that supports
it.

In prep for coming support of Hyper-V on ARM64, the arch independent
portion of the code contains calls to routines that will be populated
on ARM64 but are not needed and do nothing on x86.

Signed-off-by: Michael Kelley <mikelley@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 7 insertions, 0 deletions

diff --git a/arch/x86/kernel/irq.c b/arch/x86/kernel/irq.c
index 45fb4d2565f8..328d027d829d 100644
--- a/arch/x86/kernel/irq.c
+++ b/arch/x86/kernel/irq.c
@@ -150,6 +150,13 @@ int arch_show_interrupts(struct seq_file *p, int prec)
                                    irq_stats(j)->irq_hv_reenlightenment_count);
                 seq_puts(p, "  Hyper-V reenlightenment interrupts\n");
         }
+        if (test_bit(HYPERV_STIMER0_VECTOR, system_vectors)) {
+                seq_printf(p, "%*s: ", prec, "HVS");
+                for_each_online_cpu(j)
+                        seq_printf(p, "%10u ",
+                                   irq_stats(j)->hyperv_stimer0_count);
+                seq_puts(p, "  Hyper-V stimer0 interrupts\n");
+        }
 #endif
         seq_printf(p, "%*s: %10u\n", prec, "ERR", atomic_read(&irq_err_count));
 #if defined(CONFIG_X86_IO_APIC)