Re: [Xen-devel] [PATCH V12 5/9] Revert "pci: don't export an internal function"

[Anthony PERARD <anthony.perard@xxxxxxxxxx>]

On 13/06/12 13:48, Jan Kiszka wrote:
> > > >>  Will you be able to use an address parser via some device property?
> > >
> > >  Yes. Actually, the address is already a device property.
> > >
> Great. Then we should try to come up with a common pci-host-devaddr
> property everyone can use.
Is this patch would be a good common property?

It's probably close to the patch you send earlier Jan.

If it's good, I'll resend my passthrough patch series with this patch.


diff --git a/hw/qdev-properties.c b/hw/qdev-properties.c
index b7b5597..9c7a271 100644
--- a/hw/qdev-properties.c
+++ b/hw/qdev-properties.c
@@ -928,6 +928,104 @@ PropertyInfo qdev_prop_blocksize = {
     .max   = 65024,
 };

+/* --- pci host address --- */
+
+static void get_pci_host_devaddr(Object *obj, Visitor *v, void *opaque,
+                                 const char *name, Error **errp)
+{
+    DeviceState *dev = DEVICE(obj);
+    Property *prop = opaque;
+    PCIHostDeviceAddress *addr = qdev_get_prop_ptr(dev, prop);
+    char buffer[4 + 2 + 2 + 2 + 1];
+    char *p = buffer;
+
+    snprintf(buffer, sizeof(buffer), "%04x:%02x:%02x.%d",
+             addr->domain, addr->bus, addr->slot, addr->function);
+
+    visit_type_str(v, &p, name, errp);
+}
+
+/*
+ * Parse [<domain>:]<bus>:<slot>.<func>
+ *   if <domain> is not supplied, it's assumed to be 0.
+ */
+static void set_pci_host_devaddr(Object *obj, Visitor *v, void *opaque,
+                                 const char *name, Error **errp)
+{
+    DeviceState *dev = DEVICE(obj);
+    Property *prop = opaque;
+    PCIHostDeviceAddress *addr = qdev_get_prop_ptr(dev, prop);
+    Error *local_err = NULL;
+    char *str, *p;
+    char *e;
+    unsigned long val;
+    unsigned long dom = 0, bus = 0;
+    unsigned int slot = 0, func = 0;
+
+    if (dev->state != DEV_STATE_CREATED) {
+        error_set(errp, QERR_PERMISSION_DENIED);
+        return;
+    }
+
+    visit_type_str(v, &str, name, &local_err);
+    if (local_err) {
+        error_propagate(errp, local_err);
+        return;
+    }
+
+    p = str;
+    val = strtoul(p, &e, 16);
+    if (e == p || *e != ':')
+        goto inval;
+    bus = val;
+
+    p = e + 1;
+    val = strtoul(p, &e, 16);
+    if (e == p)
+        goto inval;
+    if (*e == ':') {
+        dom = bus;
+        bus = val;
+        p = e + 1;
+        val = strtoul(p, &e, 16);
+        if (e == p)
+            goto inval;
+    }
+    slot = val;
+
+    if (*e != '.')
+        goto inval;
+    p = e + 1;
+    val = strtoul(p, &e, 10);
+    if (e == p)
+        goto inval;
+    func = val;
+
+    if (dom > 0xffff || bus > 0xff || slot > 0x1f || func > 7)
+        goto inval;
+
+    if (*e)
+        goto inval;
+
+    addr->domain = dom;
+    addr->bus = bus;
+    addr->slot = slot;
+    addr->function = func;
+
+    g_free(str);
+    return;
+
+inval:
+    error_set_from_qdev_prop_error(errp, EINVAL, dev, prop, str);
+    g_free(str);
+}
+
+PropertyInfo qdev_prop_pci_host_devaddr = {
+    .name = "pci-host-devaddr",
+    .get = get_pci_host_devaddr,
+    .set = set_pci_host_devaddr,
+};
+
 /* --- public helpers --- */

 static Property *qdev_prop_walk(Property *props, const char *name)
diff --git a/hw/qdev.h b/hw/qdev.h
index 4e90119..9a54ebe 100644
--- a/hw/qdev.h
+++ b/hw/qdev.h
@@ -225,6 +225,7 @@ extern PropertyInfo qdev_prop_netdev;
 extern PropertyInfo qdev_prop_vlan;
 extern PropertyInfo qdev_prop_pci_devfn;
 extern PropertyInfo qdev_prop_blocksize;
+extern PropertyInfo qdev_prop_pci_host_devaddr;

 #define DEFINE_PROP(_name, _state, _field, _prop, _type) { \
         .name      = (_name),                                    \
@@ -288,6 +289,8 @@ extern PropertyInfo qdev_prop_blocksize;
                         LostTickPolicy)
 #define DEFINE_PROP_BLOCKSIZE(_n, _s, _f, _d) \
     DEFINE_PROP_DEFAULT(_n, _s, _f, _d, qdev_prop_blocksize, uint16_t)
+#define DEFINE_PROP_PCI_HOST_DEVADDR(_n, _s, _f) \
+    DEFINE_PROP(_n, _s, _f, qdev_prop_pci_host_devaddr, 
PCIHostDeviceAddress)
 #define DEFINE_PROP_END_OF_LIST()               \
     {}
diff --git a/qemu-common.h b/qemu-common.h
index 91e0562..0d6e51c 100644
--- a/qemu-common.h
+++ b/qemu-common.h
@@ -274,6 +274,13 @@ typedef enum LostTickPolicy {
     LOST_TICK_MAX
 } LostTickPolicy;

+typedef struct PCIHostDeviceAddress {
+    unsigned int domain;
+    unsigned int bus;
+    unsigned int slot;
+    unsigned int function;
+} PCIHostDeviceAddress;
+
 void tcg_exec_init(unsigned long tb_size);
 bool tcg_enabled(void);


--
Anthony PERARD

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