Patchwork [3/5] PCI: Convert pci_info() to QObject

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Submitter Luiz Capitulino
Date Jan. 5, 2010, 8:34 p.m.
Message ID <1262723698-23658-4-git-send-email-lcapitulino@redhat.com>
Download mbox | patch
Permalink /patch/42226/
State New
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Comments

Luiz Capitulino - Jan. 5, 2010, 8:34 p.m.
The returned QObject is a QList of all buses. Each bus is
represented by a QDict, which has a key with a QList of all
PCI devices attached to it. Each device is represented by
a QDict.

IMPORTANT: support for printing PCI bridge information and
its devices is NOT part of this commit, it's going to be
added by next commits.

Finally, as has happended to other complex conversions,
it's hard to split this commit as part of it are new
functions which are called by each other.

Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
---
 hw/pci.c  |  306 +++++++++++++++++++++++++++++++++++++++++++++----------------
 hw/pci.h  |    4 +-
 monitor.c |    3 +-
 3 files changed, 232 insertions(+), 81 deletions(-)
Anthony Liguori - Jan. 7, 2010, 3:19 p.m.
On 01/05/2010 02:34 PM, Luiz Capitulino wrote:
> The returned QObject is a QList of all buses. Each bus is
> represented by a QDict, which has a key with a QList of all
> PCI devices attached to it. Each device is represented by
> a QDict.
>
> IMPORTANT: support for printing PCI bridge information and
> its devices is NOT part of this commit, it's going to be
> added by next commits.
>
> Finally, as has happended to other complex conversions,
> it's hard to split this commit as part of it are new
> functions which are called by each other.
>
> Signed-off-by: Luiz Capitulino<lcapitulino@redhat.com>
> ---
>   hw/pci.c  |  306 +++++++++++++++++++++++++++++++++++++++++++++----------------
>   hw/pci.h  |    4 +-
>   monitor.c |    3 +-
>   3 files changed, 232 insertions(+), 81 deletions(-)
>
> diff --git a/hw/pci.c b/hw/pci.c
> index 0814383..8ded418 100644
> --- a/hw/pci.c
> +++ b/hw/pci.c
> @@ -27,6 +27,7 @@
>   #include "net.h"
>   #include "sysemu.h"
>   #include "loader.h"
> +#include "qemu-objects.h"
>
>   //#define DEBUG_PCI
>   #ifdef DEBUG_PCI
> @@ -1051,119 +1052,266 @@ static const pci_class_desc pci_class_descriptions[] =
>       { 0, NULL}
>   };
>
> -static void pci_info_device(PCIBus *bus, PCIDevice *d)
> +static void pci_for_each_device_under_bus(PCIBus *bus,
> +                                          void (*fn)(PCIBus *b, PCIDevice *d))
>   {
> -    Monitor *mon = cur_mon;
> -    int i, class;
> -    PCIIORegion *r;
> -    const pci_class_desc *desc;
> +    PCIDevice *d;
> +    int devfn;
>
> -    monitor_printf(mon, "  Bus %2d, device %3d, function %d:\n",
> -                   pci_bus_num(d->bus),
> -                   PCI_SLOT(d->devfn), PCI_FUNC(d->devfn));
> -    class = pci_get_word(d->config + PCI_CLASS_DEVICE);
> +    for(devfn = 0; devfn<  ARRAY_SIZE(bus->devices); devfn++) {
> +        d = bus->devices[devfn];
> +        if (d)
> +            fn(bus, d);
> +    }
> +}
>    

Coding style is off.  You're missing braces on the if.

> +void pci_for_each_device(PCIBus *bus, int bus_num,
> +                         void (*fn)(PCIBus *b, PCIDevice *d))
> +{
> +    bus = pci_find_bus(bus, bus_num);
> +
> +    if (bus) {
> +        pci_for_each_device_under_bus(bus, fn);
> +    }
> +}
> +
> +static void pci_device_print(Monitor *mon, QDict *device)
> +{
> +    QDict *qdict;
> +    QListEntry *entry;
> +    uint64_t addr, size;
> +
> +    monitor_printf(mon, "  Bus %2" PRId64 ", ", qdict_get_int(device, "bus"));
> +    monitor_printf(mon, "device %3" PRId64 ", function %" PRId64 ":\n",
> +                        qdict_get_int(device, "slot"),
> +                        qdict_get_int(device, "function"));
>       monitor_printf(mon, "    ");
> +
> +    qdict = qdict_get_qdict(device, "class_info");
> +    if (qdict_haskey(qdict, "desc")) {
> +        monitor_printf(mon, "%s", qdict_get_str(qdict, "desc"));
> +    } else {
> +        monitor_printf(mon, "Class %04" PRId64, qdict_get_int(qdict, "class"));
> +    }
> +
> +    qdict = qdict_get_qdict(device, "id");
> +    monitor_printf(mon, ": PCI device %04" PRIx64 ":%04" PRIx64 "\n",
> +                        qdict_get_int(qdict, "device"),
> +                        qdict_get_int(qdict, "vendor"));
> +
> +    if (qdict_haskey(device, "IRQ")) {
> +        monitor_printf(mon, "      IRQ %" PRId64 ".\n",
> +                            qdict_get_int(device, "IRQ"));
> +    }
> +
> +    /* TODO: PCI bridge info */
> +
> +    QLIST_FOREACH_ENTRY(qdict_get_qlist(device, "regions"), entry) {
> +        qdict = qobject_to_qdict(qlist_entry_obj(entry));
> +        monitor_printf(mon, "      BAR%d: ", (int) qdict_get_int(qdict, "BAR"));
> +
> +        addr = qdict_get_int(qdict, "address");
> +        size = qdict_get_int(qdict, "size");
> +
> +        if (!strcmp(qdict_get_str(qdict, "type"), "io")) {
> +            monitor_printf(mon, "I/O at 0x%04"FMT_PCIBUS
> +                                " [0x%04"FMT_PCIBUS"].\n",
> +                                addr, addr + size - 1);
> +        } else {
> +            monitor_printf(mon, "%d bit%s memory at 0x%08"FMT_PCIBUS
> +                               " [0x%08"FMT_PCIBUS"].\n",
> +                                qdict_get_bool(qdict, "mem_type_64") ? 64 : 32,
> +                                qdict_get_bool(qdict, "prefetch") ?
> +                                " prefetchable" : "", addr, addr + size - 1);
> +        }
> +    }
> +
> +    monitor_printf(mon, "      id \"%s\"\n", qdict_get_str(device, "qdev_id"));
> +
> +    /* TODO: PCI bridge devices */
> +}
> +
> +void do_pci_info_print(Monitor *mon, const QObject *data)
> +{
> +    QListEntry *bus, *dev;
> +
> +    QLIST_FOREACH_ENTRY(qobject_to_qlist(data), bus) {
> +        QDict *qdict = qobject_to_qdict(qlist_entry_obj(bus));
> +        QLIST_FOREACH_ENTRY(qdict_get_qlist(qdict, "devices"), dev) {
> +            pci_device_print(mon, qobject_to_qdict(qlist_entry_obj(dev)));
> +        }
> +    }
> +}
> +
> +static QObject *pci_get_dev_class(const PCIDevice *dev)
> +{
> +    int class;
> +    const char *str = "";
> +    const pci_class_desc *desc;
> +
> +    class = pci_get_word(dev->config + PCI_CLASS_DEVICE);
>       desc = pci_class_descriptions;
>       while (desc->desc&&  class != desc->class)
>           desc++;
> +
>       if (desc->desc) {
> -        monitor_printf(mon, "%s", desc->desc);
> -    } else {
> -        monitor_printf(mon, "Class %04x", class);
> -    }
> -    monitor_printf(mon, ": PCI device %04x:%04x\n",
> -           pci_get_word(d->config + PCI_VENDOR_ID),
> -           pci_get_word(d->config + PCI_DEVICE_ID));
> -
> -    if (d->config[PCI_INTERRUPT_PIN] != 0) {
> -        monitor_printf(mon, "      IRQ %d.\n",
> -                       d->config[PCI_INTERRUPT_LINE]);
> -    }
> -    if (class == 0x0604) {
> -        uint64_t base;
> -        uint64_t limit;
> -
> -        monitor_printf(mon, "      BUS %d.\n", d->config[0x19]);
> -        monitor_printf(mon, "      secondary bus %d.\n",
> -                       d->config[PCI_SECONDARY_BUS]);
> -        monitor_printf(mon, "      subordinate bus %d.\n",
> -                       d->config[PCI_SUBORDINATE_BUS]);
> -
> -        base = pci_bridge_get_base(d, PCI_BASE_ADDRESS_SPACE_IO);
> -        limit = pci_bridge_get_limit(d, PCI_BASE_ADDRESS_SPACE_IO);
> -        monitor_printf(mon, "      IO range [0x%04"PRIx64", 0x%04"PRIx64"]\n",
> -                       base, limit);
> -
> -        base = pci_bridge_get_base(d, PCI_BASE_ADDRESS_SPACE_MEMORY);
> -        limit= pci_bridge_get_limit(d, PCI_BASE_ADDRESS_SPACE_MEMORY);
> -        monitor_printf(mon,
> -                       "      memory range [0x%08"PRIx64", 0x%08"PRIx64"]\n",
> -                       base, limit);
> -
> -        base = pci_bridge_get_base(d, PCI_BASE_ADDRESS_SPACE_MEMORY |
> -                                   PCI_BASE_ADDRESS_MEM_PREFETCH);
> -        limit = pci_bridge_get_limit(d, PCI_BASE_ADDRESS_SPACE_MEMORY |
> -                                     PCI_BASE_ADDRESS_MEM_PREFETCH);
> -        monitor_printf(mon, "      prefetchable memory range "
> -                       "[0x%08"PRIx64", 0x%08"PRIx64"]\n", base, limit);
> -    }
> -    for(i = 0;i<  PCI_NUM_REGIONS; i++) {
> -        r =&d->io_regions[i];
> +        str = desc->desc;
> +    }
> +
> +    return qobject_from_jsonf("{ 'desc': %s, 'class': %d }", str, class);
> +}
> +
> +static QObject *pci_get_dev_id(const PCIDevice *dev)
> +{
> +    return qobject_from_jsonf("{ 'device': %d, 'vendor': %d }",
> +                              pci_get_word(dev->config + PCI_VENDOR_ID),
> +                              pci_get_word(dev->config + PCI_DEVICE_ID));
> +}
> +
> +static QObject *pci_get_regions_list(const PCIDevice *dev)
> +{
> +    int i;
> +    QList *regions_list;
> +
> +    regions_list = qlist_new();
> +
> +    for (i = 0; i<  PCI_NUM_REGIONS; i++) {
> +        const PCIIORegion *r =&dev->io_regions[i];
>           if (r->size != 0) {
> -            monitor_printf(mon, "      BAR%d: ", i);
> +            QObject *obj;
>               if (r->type&  PCI_BASE_ADDRESS_SPACE_IO) {
> -                monitor_printf(mon, "I/O at 0x%04"FMT_PCIBUS
> -                               " [0x%04"FMT_PCIBUS"].\n",
> -                               r->addr, r->addr + r->size - 1);
> +                obj = qobject_from_jsonf("{ 'BAR': %d, 'type': 'io', "
> +                                         "'address': %" PRId64 ", "
> +                                         "'size': %" PRId64 " }",
> +                                         i, r->addr, r->size);
>               } else {
> -                const char *type = r->type&  PCI_BASE_ADDRESS_MEM_TYPE_64 ?
> -                    "64 bit" : "32 bit";
> -                const char *prefetch =
> -                    r->type&  PCI_BASE_ADDRESS_MEM_PREFETCH ?
> -                    " prefetchable" : "";
> -
> -                monitor_printf(mon, "%s%s memory at 0x%08"FMT_PCIBUS
> -                               " [0x%08"FMT_PCIBUS"].\n",
> -                               type, prefetch,
> -                               r->addr, r->addr + r->size - 1);
> +                int mem_type_64 = r->type&  PCI_BASE_ADDRESS_MEM_TYPE_64;
> +
> +                obj = qobject_from_jsonf("{ 'BAR': %d, 'type': 'memory', "
> +                                         "'mem_type_64': %i, 'prefetch': %i, "
> +                                         "'address': %" PRId64 ", "
> +                                         "'size': %" PRId64 " }",
> +                                         i, mem_type_64,
> +                                         r->type&PCI_BASE_ADDRESS_MEM_PREFETCH,
> +                                         r->addr, r->size);
>               }
> +            qlist_append_obj(regions_list, obj);
>           }
>       }
> -    monitor_printf(mon, "      id \"%s\"\n", d->qdev.id ? d->qdev.id : "");
> -    if (class == 0x0604&&  d->config[0x19] != 0) {
> -        pci_for_each_device(bus, d->config[0x19], pci_info_device);
> +
> +    return QOBJECT(regions_list);
> +}
> +
> +static QObject *pci_get_dev_dict(const PCIDevice *dev, int bus_num)
> +{
> +    QObject *obj;
> +
> +    obj = qobject_from_jsonf("{ 'bus': %d, 'slot': %d, 'function': %d,"                                       "'class_info': %p, 'id': %p, 'regions': %p,"
> +                              " 'qdev_id': %s }",
> +                              bus_num,
> +                              PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn),
> +                              pci_get_dev_class(dev), pci_get_dev_id(dev),
> +                              pci_get_regions_list(dev),
> +                              dev->qdev.id ? dev->qdev.id : "");
> +
> +    if (dev->config[PCI_INTERRUPT_PIN] != 0) {
> +        QDict *qdict = qobject_to_qdict(obj);
> +        qdict_put(qdict, "IRQ", qint_from_int(dev->config[PCI_INTERRUPT_LINE]));
>       }
> +
> +    return obj;
>   }
>
> -static void pci_for_each_device_under_bus(PCIBus *bus,
> -                                          void (*fn)(PCIBus *b, PCIDevice *d))
> +static QObject *pci_get_devices_list(PCIBus *bus, int bus_num)
>   {
> -    PCIDevice *d;
>       int devfn;
> +    PCIDevice *dev;
> +    QList *dev_list;
>
> -    for(devfn = 0; devfn<  ARRAY_SIZE(bus->devices); devfn++) {
> -        d = bus->devices[devfn];
> -        if (d)
> -            fn(bus, d);
> +    dev_list = qlist_new();
> +
> +    for (devfn = 0; devfn<  ARRAY_SIZE(bus->devices); devfn++) {
> +        dev = bus->devices[devfn];
> +        if (dev) {
> +            qlist_append_obj(dev_list, pci_get_dev_dict(dev, bus_num));
> +        }
>       }
> +
> +    return QOBJECT(dev_list);
>   }
>
> -void pci_for_each_device(PCIBus *bus, int bus_num,
> -                         void (*fn)(PCIBus *b, PCIDevice *d))
> +static QObject *pci_get_bus_dict(PCIBus *bus, int bus_num)
>   {
>       bus = pci_find_bus(bus, bus_num);
> -
>       if (bus) {
> -        pci_for_each_device_under_bus(bus, fn);
> +        return qobject_from_jsonf("{ 'bus': %d, 'devices': %p }",
> +                                  bus_num, pci_get_devices_list(bus, bus_num));
>       }
> +
> +    return NULL;
>   }
>
> -void pci_info(Monitor *mon)
> +/**
> + * do_pci_info(): PCI buses and devices information
> + *
> + * The returned QObject is a QList of all buses. Each bus is
> + * represented by a QDict, which has a key with a QList of all
> + * PCI devices attached to it. Each device is represented by
> + * a QDict.
> + *
> + * The bus QDict contains the following:
> + *
> + * - "bus": bus number
> + * - "devices": a QList of QDicts, each QDict represents a PCI
> + *   device
> + *
> + * The PCI device QDict contains the following:
> + *
> + * - "bus": bus number
> + * - "slot": slot number
> + * - "function": function number
> + * - "class_info": a QDict containing:
> + *      - "desc": device class description
> + *      - "class": device class number
> + * - "id": a QDict containing:
> + *      - "device": device ID
> + *      - "vendor": vendor ID
> + * - "qdev_id": qdev id string
> + * - "regions": a QList of QDicts, each QDict represents a
> + *   memory region of this device
> + *
> + * The region QDict can be an I/O region or a memory region,
> + * the I/O region contains the following:
> + *
> + * - "type": "io"
> + * - "BAR": BAR number
> + * - "address": memory address
> + * - "size": memory size
> + *
> + * The memory region QDict contains the following:
> + *
> + * - "type": "memory"
> + * - "BAR": BAR number
> + * - "address": memory address
> + * - "size": memory size
> + * - "mem_type_64": true or false
> + * - "prefetch": true or false
> + */
> +void do_pci_info(Monitor *mon, QObject **ret_data)
>   {
> +    QList *bus_list;
>       struct PCIHostBus *host;
> +
> +    bus_list = qlist_new();
> +
>       QLIST_FOREACH(host,&host_buses, next) {
> -        pci_for_each_device(host->bus, 0, pci_info_device);
> +        QObject *obj = pci_get_bus_dict(host->bus, 0);
> +        if (obj) {
> +            qlist_append_obj(bus_list, obj);
> +        }
>       }
> +
> +    *ret_data = QOBJECT(bus_list);
>   }
>
>   static const char * const pci_nic_models[] = {
> diff --git a/hw/pci.h b/hw/pci.h
> index fd16460..e1e6d29 100644
> --- a/hw/pci.h
> +++ b/hw/pci.h
> @@ -2,6 +2,7 @@
>   #define QEMU_PCI_H
>
>   #include "qemu-common.h"
> +#include "qobject.h"
>
>   #include "qdev.h"
>
> @@ -300,7 +301,8 @@ PCIBus *pci_get_bus_devfn(int *devfnp, const char *devaddr);
>   int pci_read_devaddr(Monitor *mon, const char *addr, int *domp, int *busp,
>                        unsigned *slotp);
>
> -void pci_info(Monitor *mon);
> +void do_pci_info_print(Monitor *mon, const QObject *data);
> +void do_pci_info(Monitor *mon, QObject **ret_data);
>   PCIBus *pci_bridge_init(PCIBus *bus, int devfn, uint16_t vid, uint16_t did,
>                           pci_map_irq_fn map_irq, const char *name);
>   PCIDevice *pci_bridge_get_device(PCIBus *bus);
> diff --git a/monitor.c b/monitor.c
> index 3af1d5c..3fe7aa9 100644
> --- a/monitor.c
> +++ b/monitor.c
> @@ -2436,7 +2436,8 @@ static const mon_cmd_t info_cmds[] = {
>           .args_type  = "",
>           .params     = "",
>           .help       = "show PCI info",
> -        .mhandler.info = pci_info,
> +        .user_print = do_pci_info_print,
> +        .mhandler.info_new = do_pci_info,
>       },
>   #if defined(TARGET_I386) || defined(TARGET_SH4)
>       {
>    

The conversion otherwise looks good.  I'm not sure mem_type_64 is the 
best property name but I'll let mst comment on that.  I'd also prefer we 
didn't mix case with BAR and IRQ.  I'd rather see us just use bar and irq.

Regards,

Anthony Liguori
Luiz Capitulino - Jan. 7, 2010, 6 p.m.
On Thu, 07 Jan 2010 09:19:28 -0600
Anthony Liguori <aliguori@linux.vnet.ibm.com> wrote:

> > -static void pci_info_device(PCIBus *bus, PCIDevice *d)
> > +static void pci_for_each_device_under_bus(PCIBus *bus,
> > +                                          void (*fn)(PCIBus *b, PCIDevice *d))
> >   {
> > -    Monitor *mon = cur_mon;
> > -    int i, class;
> > -    PCIIORegion *r;
> > -    const pci_class_desc *desc;
> > +    PCIDevice *d;
> > +    int devfn;
> >
> > -    monitor_printf(mon, "  Bus %2d, device %3d, function %d:\n",
> > -                   pci_bus_num(d->bus),
> > -                   PCI_SLOT(d->devfn), PCI_FUNC(d->devfn));
> > -    class = pci_get_word(d->config + PCI_CLASS_DEVICE);
> > +    for(devfn = 0; devfn<  ARRAY_SIZE(bus->devices); devfn++) {
> > +        d = bus->devices[devfn];
> > +        if (d)
> > +            fn(bus, d);
> > +    }
> > +}
> >    
> 
> Coding style is off.  You're missing braces on the if.

 Was based on the current code, will fix.

> The conversion otherwise looks good.  I'm not sure mem_type_64 is the 
> best property name but I'll let mst comment on that.  I'd also prefer we 
> didn't mix case with BAR and IRQ.  I'd rather see us just use bar and irq.

 Ok, will fix too.

Patch

diff --git a/hw/pci.c b/hw/pci.c
index 0814383..8ded418 100644
--- a/hw/pci.c
+++ b/hw/pci.c
@@ -27,6 +27,7 @@ 
 #include "net.h"
 #include "sysemu.h"
 #include "loader.h"
+#include "qemu-objects.h"
 
 //#define DEBUG_PCI
 #ifdef DEBUG_PCI
@@ -1051,119 +1052,266 @@  static const pci_class_desc pci_class_descriptions[] =
     { 0, NULL}
 };
 
-static void pci_info_device(PCIBus *bus, PCIDevice *d)
+static void pci_for_each_device_under_bus(PCIBus *bus,
+                                          void (*fn)(PCIBus *b, PCIDevice *d))
 {
-    Monitor *mon = cur_mon;
-    int i, class;
-    PCIIORegion *r;
-    const pci_class_desc *desc;
+    PCIDevice *d;
+    int devfn;
 
-    monitor_printf(mon, "  Bus %2d, device %3d, function %d:\n",
-                   pci_bus_num(d->bus),
-                   PCI_SLOT(d->devfn), PCI_FUNC(d->devfn));
-    class = pci_get_word(d->config + PCI_CLASS_DEVICE);
+    for(devfn = 0; devfn < ARRAY_SIZE(bus->devices); devfn++) {
+        d = bus->devices[devfn];
+        if (d)
+            fn(bus, d);
+    }
+}
+
+void pci_for_each_device(PCIBus *bus, int bus_num,
+                         void (*fn)(PCIBus *b, PCIDevice *d))
+{
+    bus = pci_find_bus(bus, bus_num);
+
+    if (bus) {
+        pci_for_each_device_under_bus(bus, fn);
+    }
+}
+
+static void pci_device_print(Monitor *mon, QDict *device)
+{
+    QDict *qdict;
+    QListEntry *entry;
+    uint64_t addr, size;
+
+    monitor_printf(mon, "  Bus %2" PRId64 ", ", qdict_get_int(device, "bus"));
+    monitor_printf(mon, "device %3" PRId64 ", function %" PRId64 ":\n",
+                        qdict_get_int(device, "slot"),
+                        qdict_get_int(device, "function"));
     monitor_printf(mon, "    ");
+
+    qdict = qdict_get_qdict(device, "class_info");
+    if (qdict_haskey(qdict, "desc")) {
+        monitor_printf(mon, "%s", qdict_get_str(qdict, "desc"));
+    } else {
+        monitor_printf(mon, "Class %04" PRId64, qdict_get_int(qdict, "class"));
+    }
+
+    qdict = qdict_get_qdict(device, "id");
+    monitor_printf(mon, ": PCI device %04" PRIx64 ":%04" PRIx64 "\n",
+                        qdict_get_int(qdict, "device"),
+                        qdict_get_int(qdict, "vendor"));
+
+    if (qdict_haskey(device, "IRQ")) {
+        monitor_printf(mon, "      IRQ %" PRId64 ".\n",
+                            qdict_get_int(device, "IRQ"));
+    }
+
+    /* TODO: PCI bridge info */
+
+    QLIST_FOREACH_ENTRY(qdict_get_qlist(device, "regions"), entry) {
+        qdict = qobject_to_qdict(qlist_entry_obj(entry));
+        monitor_printf(mon, "      BAR%d: ", (int) qdict_get_int(qdict, "BAR"));
+
+        addr = qdict_get_int(qdict, "address");
+        size = qdict_get_int(qdict, "size");
+
+        if (!strcmp(qdict_get_str(qdict, "type"), "io")) {
+            monitor_printf(mon, "I/O at 0x%04"FMT_PCIBUS
+                                " [0x%04"FMT_PCIBUS"].\n",
+                                addr, addr + size - 1);
+        } else {
+            monitor_printf(mon, "%d bit%s memory at 0x%08"FMT_PCIBUS
+                               " [0x%08"FMT_PCIBUS"].\n",
+                                qdict_get_bool(qdict, "mem_type_64") ? 64 : 32,
+                                qdict_get_bool(qdict, "prefetch") ?
+                                " prefetchable" : "", addr, addr + size - 1);
+        }
+    }
+
+    monitor_printf(mon, "      id \"%s\"\n", qdict_get_str(device, "qdev_id"));
+
+    /* TODO: PCI bridge devices */
+}
+
+void do_pci_info_print(Monitor *mon, const QObject *data)
+{
+    QListEntry *bus, *dev;
+
+    QLIST_FOREACH_ENTRY(qobject_to_qlist(data), bus) {
+        QDict *qdict = qobject_to_qdict(qlist_entry_obj(bus));
+        QLIST_FOREACH_ENTRY(qdict_get_qlist(qdict, "devices"), dev) {
+            pci_device_print(mon, qobject_to_qdict(qlist_entry_obj(dev)));
+        }
+    }
+}
+
+static QObject *pci_get_dev_class(const PCIDevice *dev)
+{
+    int class;
+    const char *str = "";
+    const pci_class_desc *desc;
+
+    class = pci_get_word(dev->config + PCI_CLASS_DEVICE);
     desc = pci_class_descriptions;
     while (desc->desc && class != desc->class)
         desc++;
+
     if (desc->desc) {
-        monitor_printf(mon, "%s", desc->desc);
-    } else {
-        monitor_printf(mon, "Class %04x", class);
-    }
-    monitor_printf(mon, ": PCI device %04x:%04x\n",
-           pci_get_word(d->config + PCI_VENDOR_ID),
-           pci_get_word(d->config + PCI_DEVICE_ID));
-
-    if (d->config[PCI_INTERRUPT_PIN] != 0) {
-        monitor_printf(mon, "      IRQ %d.\n",
-                       d->config[PCI_INTERRUPT_LINE]);
-    }
-    if (class == 0x0604) {
-        uint64_t base;
-        uint64_t limit;
-
-        monitor_printf(mon, "      BUS %d.\n", d->config[0x19]);
-        monitor_printf(mon, "      secondary bus %d.\n",
-                       d->config[PCI_SECONDARY_BUS]);
-        monitor_printf(mon, "      subordinate bus %d.\n",
-                       d->config[PCI_SUBORDINATE_BUS]);
-
-        base = pci_bridge_get_base(d, PCI_BASE_ADDRESS_SPACE_IO);
-        limit = pci_bridge_get_limit(d, PCI_BASE_ADDRESS_SPACE_IO);
-        monitor_printf(mon, "      IO range [0x%04"PRIx64", 0x%04"PRIx64"]\n",
-                       base, limit);
-
-        base = pci_bridge_get_base(d, PCI_BASE_ADDRESS_SPACE_MEMORY);
-        limit= pci_bridge_get_limit(d, PCI_BASE_ADDRESS_SPACE_MEMORY);
-        monitor_printf(mon,
-                       "      memory range [0x%08"PRIx64", 0x%08"PRIx64"]\n",
-                       base, limit);
-
-        base = pci_bridge_get_base(d, PCI_BASE_ADDRESS_SPACE_MEMORY |
-                                   PCI_BASE_ADDRESS_MEM_PREFETCH);
-        limit = pci_bridge_get_limit(d, PCI_BASE_ADDRESS_SPACE_MEMORY |
-                                     PCI_BASE_ADDRESS_MEM_PREFETCH);
-        monitor_printf(mon, "      prefetchable memory range "
-                       "[0x%08"PRIx64", 0x%08"PRIx64"]\n", base, limit);
-    }
-    for(i = 0;i < PCI_NUM_REGIONS; i++) {
-        r = &d->io_regions[i];
+        str = desc->desc;
+    }
+
+    return qobject_from_jsonf("{ 'desc': %s, 'class': %d }", str, class);
+}
+
+static QObject *pci_get_dev_id(const PCIDevice *dev)
+{
+    return qobject_from_jsonf("{ 'device': %d, 'vendor': %d }",
+                              pci_get_word(dev->config + PCI_VENDOR_ID),
+                              pci_get_word(dev->config + PCI_DEVICE_ID));
+}
+
+static QObject *pci_get_regions_list(const PCIDevice *dev)
+{
+    int i;
+    QList *regions_list;
+
+    regions_list = qlist_new();
+
+    for (i = 0; i < PCI_NUM_REGIONS; i++) {
+        const PCIIORegion *r = &dev->io_regions[i];
         if (r->size != 0) {
-            monitor_printf(mon, "      BAR%d: ", i);
+            QObject *obj;
             if (r->type & PCI_BASE_ADDRESS_SPACE_IO) {
-                monitor_printf(mon, "I/O at 0x%04"FMT_PCIBUS
-                               " [0x%04"FMT_PCIBUS"].\n",
-                               r->addr, r->addr + r->size - 1);
+                obj = qobject_from_jsonf("{ 'BAR': %d, 'type': 'io', "
+                                         "'address': %" PRId64 ", "
+                                         "'size': %" PRId64 " }",
+                                         i, r->addr, r->size);
             } else {
-                const char *type = r->type & PCI_BASE_ADDRESS_MEM_TYPE_64 ?
-                    "64 bit" : "32 bit";
-                const char *prefetch =
-                    r->type & PCI_BASE_ADDRESS_MEM_PREFETCH ?
-                    " prefetchable" : "";
-
-                monitor_printf(mon, "%s%s memory at 0x%08"FMT_PCIBUS
-                               " [0x%08"FMT_PCIBUS"].\n",
-                               type, prefetch,
-                               r->addr, r->addr + r->size - 1);
+                int mem_type_64 = r->type & PCI_BASE_ADDRESS_MEM_TYPE_64;
+
+                obj = qobject_from_jsonf("{ 'BAR': %d, 'type': 'memory', "
+                                         "'mem_type_64': %i, 'prefetch': %i, "
+                                         "'address': %" PRId64 ", "
+                                         "'size': %" PRId64 " }",
+                                         i, mem_type_64,
+                                         r->type &PCI_BASE_ADDRESS_MEM_PREFETCH,
+                                         r->addr, r->size);
             }
+            qlist_append_obj(regions_list, obj);
         }
     }
-    monitor_printf(mon, "      id \"%s\"\n", d->qdev.id ? d->qdev.id : "");
-    if (class == 0x0604 && d->config[0x19] != 0) {
-        pci_for_each_device(bus, d->config[0x19], pci_info_device);
+
+    return QOBJECT(regions_list);
+}
+
+static QObject *pci_get_dev_dict(const PCIDevice *dev, int bus_num)
+{
+    QObject *obj;
+
+    obj = qobject_from_jsonf("{ 'bus': %d, 'slot': %d, 'function': %d,"                                       "'class_info': %p, 'id': %p, 'regions': %p,"
+                              " 'qdev_id': %s }",
+                              bus_num,
+                              PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn),
+                              pci_get_dev_class(dev), pci_get_dev_id(dev),
+                              pci_get_regions_list(dev),
+                              dev->qdev.id ? dev->qdev.id : "");
+
+    if (dev->config[PCI_INTERRUPT_PIN] != 0) {
+        QDict *qdict = qobject_to_qdict(obj);
+        qdict_put(qdict, "IRQ", qint_from_int(dev->config[PCI_INTERRUPT_LINE]));
     }
+
+    return obj;
 }
 
-static void pci_for_each_device_under_bus(PCIBus *bus,
-                                          void (*fn)(PCIBus *b, PCIDevice *d))
+static QObject *pci_get_devices_list(PCIBus *bus, int bus_num)
 {
-    PCIDevice *d;
     int devfn;
+    PCIDevice *dev;
+    QList *dev_list;
 
-    for(devfn = 0; devfn < ARRAY_SIZE(bus->devices); devfn++) {
-        d = bus->devices[devfn];
-        if (d)
-            fn(bus, d);
+    dev_list = qlist_new();
+
+    for (devfn = 0; devfn < ARRAY_SIZE(bus->devices); devfn++) {
+        dev = bus->devices[devfn];
+        if (dev) {
+            qlist_append_obj(dev_list, pci_get_dev_dict(dev, bus_num));
+        }
     }
+
+    return QOBJECT(dev_list);
 }
 
-void pci_for_each_device(PCIBus *bus, int bus_num,
-                         void (*fn)(PCIBus *b, PCIDevice *d))
+static QObject *pci_get_bus_dict(PCIBus *bus, int bus_num)
 {
     bus = pci_find_bus(bus, bus_num);
-
     if (bus) {
-        pci_for_each_device_under_bus(bus, fn);
+        return qobject_from_jsonf("{ 'bus': %d, 'devices': %p }",
+                                  bus_num, pci_get_devices_list(bus, bus_num));
     }
+
+    return NULL;
 }
 
-void pci_info(Monitor *mon)
+/**
+ * do_pci_info(): PCI buses and devices information
+ *
+ * The returned QObject is a QList of all buses. Each bus is
+ * represented by a QDict, which has a key with a QList of all
+ * PCI devices attached to it. Each device is represented by
+ * a QDict.
+ *
+ * The bus QDict contains the following:
+ *
+ * - "bus": bus number
+ * - "devices": a QList of QDicts, each QDict represents a PCI
+ *   device
+ *
+ * The PCI device QDict contains the following:
+ *
+ * - "bus": bus number
+ * - "slot": slot number
+ * - "function": function number
+ * - "class_info": a QDict containing:
+ *      - "desc": device class description
+ *      - "class": device class number
+ * - "id": a QDict containing:
+ *      - "device": device ID
+ *      - "vendor": vendor ID
+ * - "qdev_id": qdev id string
+ * - "regions": a QList of QDicts, each QDict represents a
+ *   memory region of this device
+ *
+ * The region QDict can be an I/O region or a memory region,
+ * the I/O region contains the following:
+ *
+ * - "type": "io"
+ * - "BAR": BAR number
+ * - "address": memory address
+ * - "size": memory size
+ *
+ * The memory region QDict contains the following:
+ *
+ * - "type": "memory"
+ * - "BAR": BAR number
+ * - "address": memory address
+ * - "size": memory size
+ * - "mem_type_64": true or false
+ * - "prefetch": true or false
+ */
+void do_pci_info(Monitor *mon, QObject **ret_data)
 {
+    QList *bus_list;
     struct PCIHostBus *host;
+
+    bus_list = qlist_new();
+
     QLIST_FOREACH(host, &host_buses, next) {
-        pci_for_each_device(host->bus, 0, pci_info_device);
+        QObject *obj = pci_get_bus_dict(host->bus, 0);
+        if (obj) {
+            qlist_append_obj(bus_list, obj);
+        }
     }
+
+    *ret_data = QOBJECT(bus_list);
 }
 
 static const char * const pci_nic_models[] = {
diff --git a/hw/pci.h b/hw/pci.h
index fd16460..e1e6d29 100644
--- a/hw/pci.h
+++ b/hw/pci.h
@@ -2,6 +2,7 @@ 
 #define QEMU_PCI_H
 
 #include "qemu-common.h"
+#include "qobject.h"
 
 #include "qdev.h"
 
@@ -300,7 +301,8 @@  PCIBus *pci_get_bus_devfn(int *devfnp, const char *devaddr);
 int pci_read_devaddr(Monitor *mon, const char *addr, int *domp, int *busp,
                      unsigned *slotp);
 
-void pci_info(Monitor *mon);
+void do_pci_info_print(Monitor *mon, const QObject *data);
+void do_pci_info(Monitor *mon, QObject **ret_data);
 PCIBus *pci_bridge_init(PCIBus *bus, int devfn, uint16_t vid, uint16_t did,
                         pci_map_irq_fn map_irq, const char *name);
 PCIDevice *pci_bridge_get_device(PCIBus *bus);
diff --git a/monitor.c b/monitor.c
index 3af1d5c..3fe7aa9 100644
--- a/monitor.c
+++ b/monitor.c
@@ -2436,7 +2436,8 @@  static const mon_cmd_t info_cmds[] = {
         .args_type  = "",
         .params     = "",
         .help       = "show PCI info",
-        .mhandler.info = pci_info,
+        .user_print = do_pci_info_print,
+        .mhandler.info_new = do_pci_info,
     },
 #if defined(TARGET_I386) || defined(TARGET_SH4)
     {