[PATCH] pci: Display PCI IRQ pin in "info pci"

[Peter Xu <peterx@redhat.com>]

Sometimes it would be good to be able to read the pin number along
with the IRQ number allocated.  Since we'll dump the IRQ number, no
reason to not dump the pin information.  For example, the vfio-pci
device will overwrite the pin with the hardware pin number.  It would
be nice to know the pin number of one assigned device from QMP/HMP.

CC: Dr. David Alan Gilbert <dgilbert@redhat.com>
CC: Alex Williamson <alex.williamson@redhat.com>
CC: Michael S. Tsirkin <mst@redhat.com>
CC: Marcel Apfelbaum <marcel.apfelbaum@gmail.com>
CC: Julia Suvorova <jusual@redhat.com>
CC: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
---

This helped me to debug an IRQ sharing issue, so may good to have it
in master too.
---
 hw/pci/pci.c       | 1 +
 monitor/hmp-cmds.c | 3 ++-
 qapi/misc.json     | 6 ++++--
 3 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/hw/pci/pci.c b/hw/pci/pci.c
index e1ed6677e1..7ebf532ac9 100644
--- a/hw/pci/pci.c
+++ b/hw/pci/pci.c
@@ -1769,6 +1769,7 @@ static PciDeviceInfo *qmp_query_pci_device(PCIDevice *dev, PCIBus *bus,
     info->regions = qmp_query_pci_regions(dev);
     info->qdev_id = g_strdup(dev->qdev.id ? dev->qdev.id : "");
 
+    info->irq_pin = dev->config[PCI_INTERRUPT_PIN];
     if (dev->config[PCI_INTERRUPT_PIN] != 0) {
         info->has_irq = true;
         info->irq = dev->config[PCI_INTERRUPT_LINE];
diff --git a/monitor/hmp-cmds.c b/monitor/hmp-cmds.c
index 58724031ea..04c86bbb03 100644
--- a/monitor/hmp-cmds.c
+++ b/monitor/hmp-cmds.c
@@ -680,7 +680,8 @@ static void hmp_info_pci_device(Monitor *mon, const PciDeviceInfo *dev)
     }
 
     if (dev->has_irq) {
-        monitor_printf(mon, "      IRQ %" PRId64 ".\n", dev->irq);
+        monitor_printf(mon, "      IRQ %" PRId64 ", pin %c\n",
+                       dev->irq, (char)('A' + dev->irq_pin - 1));
     }
 
     if (dev->has_pci_bridge) {
diff --git a/qapi/misc.json b/qapi/misc.json
index c18fe681fb..f8d33ddb4e 100644
--- a/qapi/misc.json
+++ b/qapi/misc.json
@@ -403,6 +403,8 @@
 #
 # @irq: if an IRQ is assigned to the device, the IRQ number
 #
+# @irq_pin: the IRQ pin, zero means no IRQ (since 5.1)
+#
 # @qdev_id: the device name of the PCI device
 #
 # @pci_bridge: if the device is a PCI bridge, the bridge information
@@ -417,8 +419,8 @@
 { 'struct': 'PciDeviceInfo',
   'data': {'bus': 'int', 'slot': 'int', 'function': 'int',
            'class_info': 'PciDeviceClass', 'id': 'PciDeviceId',
-           '*irq': 'int', 'qdev_id': 'str', '*pci_bridge': 'PciBridgeInfo',
-           'regions': ['PciMemoryRegion']} }
+           '*irq': 'int', 'irq_pin': 'int', 'qdev_id': 'str',
+           '*pci_bridge': 'PciBridgeInfo', 'regions': ['PciMemoryRegion'] }}
 
 ##
 # @PciInfo:
-- 
2.24.1