[PATCH v2 2/3] msix/hmp: add interface to dump device specific info

[Dongli Zhang]

While the previous patch is to dump the MSI-X table, sometimes we may
need to dump device specific data, e.g., to help match the vector with
the specific device queue.

This patch is to add the PCI device specific interface to help dump
those information. Any PCI device class may implement this
PCIDeviceClass->msix_info interface.

Cc: Jason Wang <jasowang@redhat.com>
Cc: Joe Jin <joe.jin@oracle.com>
Suggested-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Dongli Zhang <dongli.zhang@oracle.com>
---
 hmp-commands-info.hx   |  7 ++++---
 include/hw/pci/pci.h   |  3 +++
 softmmu/qdev-monitor.c | 11 +++++++++++
 3 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/hmp-commands-info.hx b/hmp-commands-info.hx
index cbd056442b..df9cdc6c7e 100644
--- a/hmp-commands-info.hx
+++ b/hmp-commands-info.hx
@@ -223,9 +223,10 @@ ERST
 
     {
         .name       = "msix",
-        .args_type  = "dev:s",
-        .params     = "dev",
-        .help       = "dump MSI-X information",
+        .args_type  = "info:-d,dev:s",
+        .params     = "[-d] dev",
+        .help       = "dump MSI-X information; "
+                      "(-d: show device specific info)",
         .cmd        = hmp_info_msix,
     },
 
diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h
index 6be4e0c460..4620b9e757 100644
--- a/include/hw/pci/pci.h
+++ b/include/hw/pci/pci.h
@@ -129,6 +129,8 @@ typedef void PCIMapIORegionFunc(PCIDevice *pci_dev, int 
region_num,
                                 pcibus_t addr, pcibus_t size, int type);
 typedef void PCIUnregisterFunc(PCIDevice *pci_dev);
 
+typedef void PCIMSIXInfoFunc(Monitor *mon, PCIDevice *dev, Error **errp);
+
 typedef struct PCIIORegion {
     pcibus_t addr; /* current PCI mapping address. -1 means not mapped */
 #define PCI_BAR_UNMAPPED (~(pcibus_t)0)
@@ -224,6 +226,7 @@ struct PCIDeviceClass {
     PCIUnregisterFunc *exit;
     PCIConfigReadFunc *config_read;
     PCIConfigWriteFunc *config_write;
+    PCIMSIXInfoFunc *msix_info;
 
     uint16_t vendor_id;
     uint16_t device_id;
diff --git a/softmmu/qdev-monitor.c b/softmmu/qdev-monitor.c
index 7837a17d0d..7fd3fe0ada 100644
--- a/softmmu/qdev-monitor.c
+++ b/softmmu/qdev-monitor.c
@@ -1011,7 +1011,9 @@ void hmp_info_msix(Monitor *mon, const QDict *qdict)
 {
     const char *name = qdict_get_str(qdict, "dev");
     DeviceState *dev = find_device_state(name, NULL);
+    bool info = qdict_get_try_bool(qdict, "info", false);
     PCIDevice *pci_dev;
+    PCIDeviceClass *pc;
     Error *err = NULL;
 
     if (!dev) {
@@ -1027,6 +1029,15 @@ void hmp_info_msix(Monitor *mon, const QDict *qdict)
     pci_dev = PCI_DEVICE(dev);
     msix_dump_info(mon, pci_dev, &err);
 
+    if (info) {
+        pc = PCI_DEVICE_GET_CLASS(pci_dev);
+        if (pc->msix_info) {
+            pc->msix_info(mon, pci_dev, &err);
+        } else {
+            error_setg(&err, "Device specific info not supported");
+        }
+    }
+
 exit:
     hmp_handle_error(mon, err);
 }
-- 
2.17.1