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[Qemu-devel] [PATCH v2 1/6] qbus: add functions to walk both devices and
From: |
Isaku Yamahata |
Subject: |
[Qemu-devel] [PATCH v2 1/6] qbus: add functions to walk both devices and busses |
Date: |
Fri, 19 Nov 2010 18:55:58 +0900 |
From: Anthony Liguori <address@hidden>
There are some cases where you want to walk the busses, in particular, when
searching for a bus either by name or DeviceInfo.
Paolo suggested that we model the return values on how GCC's walkers work which
allows an actor to skip child transversal, or terminate walking with a positive
value that's returned as the qbus_walk_children's result.
Signed-off-by: Isaku Yamahata <address@hidden>
Signed-off-by: Anthony Liguori <address@hidden>
---
Changes v1 -> v2:
- update comments to match the implementation
---
hw/qdev.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++
hw/qdev.h | 11 +++++++++++
2 files changed, 57 insertions(+), 0 deletions(-)
diff --git a/hw/qdev.c b/hw/qdev.c
index 35858cb..11d845a 100644
--- a/hw/qdev.c
+++ b/hw/qdev.c
@@ -449,6 +449,52 @@ BusState *qdev_get_child_bus(DeviceState *dev, const char
*name)
return NULL;
}
+int qbus_walk_children(BusState *bus, qdev_walkerfn *devfn,
+ qbus_walkerfn *busfn, void *opaque)
+{
+ DeviceState *dev;
+ int err;
+
+ if (busfn) {
+ err = busfn(bus, opaque);
+ if (err) {
+ return err;
+ }
+ }
+
+ QLIST_FOREACH(dev, &bus->children, sibling) {
+ err = qdev_walk_children(dev, devfn, busfn, opaque);
+ if (err < 0) {
+ return err;
+ }
+ }
+
+ return 0;
+}
+
+int qdev_walk_children(DeviceState *dev, qdev_walkerfn *devfn,
+ qbus_walkerfn *busfn, void *opaque)
+{
+ BusState *bus;
+ int err;
+
+ if (devfn) {
+ err = devfn(dev, opaque);
+ if (err) {
+ return err;
+ }
+ }
+
+ QLIST_FOREACH(bus, &dev->child_bus, sibling) {
+ err = qbus_walk_children(bus, devfn, busfn, opaque);
+ if (err < 0) {
+ return err;
+ }
+ }
+
+ return 0;
+}
+
static BusState *qbus_find_recursive(BusState *bus, const char *name,
const BusInfo *info)
{
diff --git a/hw/qdev.h b/hw/qdev.h
index 579328a..550fd9b 100644
--- a/hw/qdev.h
+++ b/hw/qdev.h
@@ -173,9 +173,20 @@ BusState *qdev_get_parent_bus(DeviceState *dev);
/*** BUS API. ***/
+/* Returns 0 to walk children, > 0 to skip walk, < 0 to terminate walk. */
+typedef int (qbus_walkerfn)(BusState *bus, void *opaque);
+typedef int (qdev_walkerfn)(DeviceState *dev, void *opaque);
+
void qbus_create_inplace(BusState *bus, BusInfo *info,
DeviceState *parent, const char *name);
BusState *qbus_create(BusInfo *info, DeviceState *parent, const char *name);
+/* Returns > 0 if either devfn or busfn skip walk somewhere in cursion,
+ * < 0 if either devfn or busfn terminate walk somewhere in cursion,
+ * 0 otherwise. */
+int qbus_walk_children(BusState *bus, qdev_walkerfn *devfn,
+ qbus_walkerfn *busfn, void *opaque);
+int qdev_walk_children(DeviceState *dev, qdev_walkerfn *devfn,
+ qbus_walkerfn *busfn, void *opaque);
void qbus_free(BusState *bus);
#define FROM_QBUS(type, dev) DO_UPCAST(type, qbus, dev)
--
1.7.1.1
- [Qemu-devel] [PATCH v2 0/6] qdev reset refactoring and pci bus reset, Isaku Yamahata, 2010/11/19
- [Qemu-devel] [PATCH v2 4/6] qdev: introduce a helper function which triggers reset from a given device, Isaku Yamahata, 2010/11/19
- [Qemu-devel] [PATCH v2 2/6] qdev: reset qdev along with qdev tree, Isaku Yamahata, 2010/11/19
- [Qemu-devel] [PATCH v2 6/6] pci bridge: implement secondary bus reset, Isaku Yamahata, 2010/11/19
- [Qemu-devel] [PATCH v2 5/6] pci: make use of qdev reset frame work to pci bus reset., Isaku Yamahata, 2010/11/19
- [Qemu-devel] [PATCH v2 1/6] qbus: add functions to walk both devices and busses,
Isaku Yamahata <=
- [Qemu-devel] [PATCH v2 3/6] qdev: introduce reset call back for qbus level, Isaku Yamahata, 2010/11/19
- [Qemu-devel] Re: [PATCH v2 0/6] qdev reset refactoring and pci bus reset, Michael S. Tsirkin, 2010/11/22
- [Qemu-devel] Re: [PATCH v2 0/6] qdev reset refactoring and pci bus reset, Isaku Yamahata, 2010/11/22
- [Qemu-devel] Re: [PATCH v2 0/6] qdev reset refactoring and pci bus reset, Michael S. Tsirkin, 2010/11/22
- [Qemu-devel] Re: [PATCH v2 0/6] qdev reset refactoring and pci bus reset, Michael S. Tsirkin, 2010/11/22
- [Qemu-devel] Re: [PATCH v2 0/6] qdev reset refactoring and pci bus reset, Michael S. Tsirkin, 2010/11/23
- [Qemu-devel] Re: [PATCH v2 0/6] qdev reset refactoring and pci bus reset, Isaku Yamahata, 2010/11/23
- [Qemu-devel] Re: [PATCH v2 0/6] qdev reset refactoring and pci bus reset, Michael S. Tsirkin, 2010/11/24
- [Qemu-devel] Re: [PATCH v2 0/6] qdev reset refactoring and pci bus reset, Isaku Yamahata, 2010/11/24
- [Qemu-devel] Re: [PATCH v2 0/6] qdev reset refactoring and pci bus reset, Michael S. Tsirkin, 2010/11/24