[patch 20/23] QEMU/KVM: add pci_unregister_device

[Marcelo Tosatti <mtosatti@redhat.com>]

[-- Attachment #1: pci-remove --]
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Unregister the pci device, unassign its IO and memory regions, and free
associated data.

Add a callback so drivers can free device state.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

Index: kvm-userspace.hotplug/qemu/hw/pci.c
===================================================================
--- kvm-userspace.hotplug.orig/qemu/hw/pci.c
+++ kvm-userspace.hotplug/qemu/hw/pci.c
@@ -185,6 +185,48 @@ PCIDevice *pci_register_device(PCIBus *b
     return pci_dev;
 }
 
+static target_phys_addr_t pci_to_cpu_addr(target_phys_addr_t addr)
+{
+    return addr + pci_mem_base;
+}
+
+static void pci_unregister_io_regions(PCIDevice *pci_dev)
+{
+    PCIIORegion *r;
+    int i;
+
+    for(i = 0; i < PCI_NUM_REGIONS; i++) {
+        r = &pci_dev->io_regions[i];
+        if (!r->size)
+            continue;
+        if (r->type == PCI_ADDRESS_SPACE_IO) {
+            isa_unassign_ioport(r->addr, r->size);
+        } else {
+            cpu_register_physical_memory(pci_to_cpu_addr(r->addr),
+                                                     r->size,
+                                                     IO_MEM_UNASSIGNED);
+        }
+    }
+}
+
+int pci_unregister_device(PCIDevice *pci_dev)
+{
+    int ret = 0;
+
+    if (pci_dev->unregister)
+        ret = pci_dev->unregister(pci_dev);
+    if (ret)
+        return ret;
+
+    pci_unregister_io_regions(pci_dev);
+
+    qemu_free_irqs(pci_dev->irq);
+    pci_irq_index--;
+    pci_dev->bus->devices[pci_dev->devfn] = NULL;
+    qemu_free(pci_dev);
+    return 0;
+}
+
 void pci_register_io_region(PCIDevice *pci_dev, int region_num,
                             uint32_t size, int type,
                             PCIMapIORegionFunc *map_func)
@@ -207,10 +249,6 @@ void pci_register_io_region(PCIDevice *p
     *(uint32_t *)(pci_dev->config + addr) = cpu_to_le32(type);
 }
 
-static target_phys_addr_t pci_to_cpu_addr(target_phys_addr_t addr)
-{
-    return addr + pci_mem_base;
-}
 
 static void pci_update_mappings(PCIDevice *d)
 {
Index: kvm-userspace.hotplug/qemu/hw/pci.h
===================================================================
--- kvm-userspace.hotplug.orig/qemu/hw/pci.h
+++ kvm-userspace.hotplug/qemu/hw/pci.h
@@ -15,6 +15,7 @@ typedef uint32_t PCIConfigReadFunc(PCIDe
                                    uint32_t address, int len);
 typedef void PCIMapIORegionFunc(PCIDevice *pci_dev, int region_num,
                                 uint32_t addr, uint32_t size, int type);
+typedef int PCIUnregisterFunc(PCIDevice *pci_dev);
 
 #define PCI_ADDRESS_SPACE_MEM		0x00
 #define PCI_ADDRESS_SPACE_IO		0x01
@@ -56,6 +57,7 @@ struct PCIDevice {
     /* do not access the following fields */
     PCIConfigReadFunc *config_read;
     PCIConfigWriteFunc *config_write;
+    PCIUnregisterFunc *unregister;
     /* ??? This is a PC-specific hack, and should be removed.  */
     int irq_index;
 
@@ -71,6 +73,8 @@ PCIDevice *pci_register_device(PCIBus *b
                                PCIConfigReadFunc *config_read,
                                PCIConfigWriteFunc *config_write);
 
+int pci_unregister_device(PCIDevice *pci_dev);
+
 void pci_register_io_region(PCIDevice *pci_dev, int region_num,
                             uint32_t size, int type,
                             PCIMapIORegionFunc *map_func);

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