commit aa37616fb4eed38f3fc26507faf2433c998e0073
author Philippe Mathieu-Daudé <philmd@linaro.org> Thu Aug 01 15:14:49 2024 +0200
committer Michael S. Tsirkin <mst@redhat.com> Wed Sep 11 09:46:04 2024 -0400
tree b523cdd78f81bc612a2b6d139ec204d4a958ace9
parent e228d62b4af29bca698ec57efdceb46f392f5444

hw/pci/pci-hmp-cmds: Avoid displaying bogus size in 'info pci'

When BAR aren't mapped, we get:

  (qemu) info pci
    Bus  0, device   0, function 0:
      Host bridge: PCI device dead:beef
        ...
        BAR4: 32 bit memory at 0xffffffffffffffff [0x00000ffe].
        BAR5: I/O at 0xffffffffffffffff [0x0ffe].

Check the BAR is mapped comparing its address to PCI_BAR_UNMAPPED
which is what the PCI layer uses for unmapped BARs.
See pci_bar_address and pci_update_mappings implementations and
in "hw/pci/pci.h":

  typedef struct PCIIORegion {
      pcibus_t addr; /* current PCI mapping address. -1 means not mapped */
  #define PCI_BAR_UNMAPPED (~(pcibus_t)0)
      ...

This improves the logging, not displaying bogus sizes:

  (qemu) info pci
    Bus  0, device   0, function 0:
      Host bridge: PCI device dead:beef
        ...
      BAR4: 32 bit memory (not mapped)
      BAR5: I/O (not mapped)

Remove trailing dot which is not used in other commands format.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <20240801131449.51328-1-philmd@linaro.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

hw/pci/pci-hmp-cmds.c

diff --git a/hw/pci/pci-hmp-cmds.c b/hw/pci/pci-hmp-cmds.c
index b09fce9..fdfe444 100644
--- a/hw/pci/pci-hmp-cmds.c
+++ b/hw/pci/pci-hmp-cmds.c
@@ -83,15 +83,25 @@
         monitor_printf(mon, "      BAR%" PRId64 ": ", region->value->bar);
 
         if (!strcmp(region->value->type, "io")) {
-            monitor_printf(mon, "I/O at 0x%04" PRIx64
-                                " [0x%04" PRIx64 "].\n",
-                           addr, addr + size - 1);
+            if (addr != PCI_BAR_UNMAPPED) {
+                monitor_printf(mon, "I/O at 0x%04" PRIx64
+                                    " [0x%04" PRIx64 "]\n",
+                               addr, addr + size - 1);
+            } else {
+                monitor_printf(mon, "I/O (not mapped)\n");
+            }
         } else {
-            monitor_printf(mon, "%d bit%s memory at 0x%08" PRIx64
-                               " [0x%08" PRIx64 "].\n",
-                           region->value->mem_type_64 ? 64 : 32,
-                           region->value->prefetch ? " prefetchable" : "",
-                           addr, addr + size - 1);
+            if (addr != PCI_BAR_UNMAPPED) {
+                monitor_printf(mon, "%d bit%s memory at 0x%08" PRIx64
+                                   " [0x%08" PRIx64 "]\n",
+                               region->value->mem_type_64 ? 64 : 32,
+                               region->value->prefetch ? " prefetchable" : "",
+                               addr, addr + size - 1);
+            } else {
+                monitor_printf(mon, "%d bit%s memory (not mapped)\n",
+                               region->value->mem_type_64 ? 64 : 32,
+                               region->value->prefetch ? " prefetchable" : "");
+            }
         }
     }