[src/trunk]: src/sys/dev/pci allow MSI-X even with just one interrupt, on som...

[jdolecek <jdolecek%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/1cd43774b7eb
branches:  trunk
changeset: 837382:1cd43774b7eb
user:      jdolecek <jdolecek%NetBSD.org@localhost>
date:      Sat Dec 01 13:31:48 2018 +0000

description:
allow MSI-X even with just one interrupt, on some systems MSI/INTx might
not be available (or working, for that matter)

diffstat:

 sys/dev/pci/nvme_pci.c |  9 +++++----
 1 files changed, 5 insertions(+), 4 deletions(-)

diffs (32 lines):

diff -r 5f16b8bc88b9 -r 1cd43774b7eb sys/dev/pci/nvme_pci.c
--- a/sys/dev/pci/nvme_pci.c    Sat Dec 01 13:24:45 2018 +0000
+++ b/sys/dev/pci/nvme_pci.c    Sat Dec 01 13:31:48 2018 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: nvme_pci.c,v 1.22 2018/12/01 13:24:45 jdolecek Exp $   */
+/*     $NetBSD: nvme_pci.c,v 1.23 2018/12/01 13:31:48 jdolecek Exp $   */
 /*     $OpenBSD: nvme_pci.c,v 1.3 2016/04/14 11:18:32 dlg Exp $ */
 
 /*
@@ -43,7 +43,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: nvme_pci.c,v 1.22 2018/12/01 13:24:45 jdolecek Exp $");
+__KERNEL_RCSID(0, "$NetBSD: nvme_pci.c,v 1.23 2018/12/01 13:31:48 jdolecek Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -398,10 +398,11 @@
        /* MSI-X */
        counts[PCI_INTR_TYPE_MSIX] = uimin(pci_msix_count(pa->pa_pc, pa->pa_tag),
            ncpu + 1);
-       if (counts[PCI_INTR_TYPE_MSIX] < 2) {
+       if (counts[PCI_INTR_TYPE_MSIX] < 1) {
                counts[PCI_INTR_TYPE_MSIX] = 0;
        } else if (!nvme_pci_mq || !nvme_pci_mpsafe) {
-               counts[PCI_INTR_TYPE_MSIX] = 2; /* adminq + 1 ioq */
+               if (counts[PCI_INTR_TYPE_MSI] > 2)
+                       counts[PCI_INTR_TYPE_MSIX] = 2; /* adminq + 1 ioq */
        }
 
        /* MSI */