pci: add default pci subsystem id for all devices (Gerd Hoffman)

This sets a default PCI subsystem ID for all emulated PCI devices.  PCI
specs require this, so do it.

In many cases it is enougth to know the PCI ID to handle a device
correctly.  Sometimes a device driver must identify the exact piece of
hardware (via PCI Subsystem ID) though.

What does this patch to qemu devices:

Right now the emulated PCI devices have no PCI subsystem ID, only the
PCI ID.  The discussed patch sets a default PCI subsystem ID for all
emulated devices.  Which will make the qemu devices look pretty much
like in the laptop case: all PCI subsystem IDs will point to qemu by
default.

If a driver emulates a very specific piece of hardware where it has to
emulate more than just the PCI chip, it can overwrite the PCI subsystem
ID without problems.  The es1370 driver does that for example.
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>



git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5986 c046a42c-6fe2-441c-8c8c-71466251a162

hw/pci.c

@@ -50,6 +50,8 @@ static void pci_update_mappings(PCIDevice *d);
 static void pci_set_irq(void *opaque, int irq_num, int level);
 
 target_phys_addr_t pci_mem_base;
+static uint16_t pci_default_sub_vendor_id = PCI_SUBVENDOR_ID_REDHAT_QUMRANET;
+static uint16_t pci_default_sub_device_id = PCI_SUBDEVICE_ID_QEMU;
 static int pci_irq_index;
 static PCIBus *first_bus;
 
@@ -145,6 +147,16 @@ int pci_device_load(PCIDevice *s, QEMUFile *f)
     return 0;
 }
 
+static int pci_set_default_subsystem_id(PCIDevice *pci_dev)
+{
+    uint16_t *id;
+
+    id = (void*)(&pci_dev->config[PCI_SUBVENDOR_ID]);
+    id[0] = cpu_to_le16(pci_default_sub_vendor_id);
+    id[1] = cpu_to_le16(pci_default_sub_device_id);
+    return 0;
+}
+
 /* -1 for devfn means auto assign */
 PCIDevice *pci_register_device(PCIBus *bus, const char *name,
                                int instance_size, int devfn,
@@ -171,6 +183,7 @@ PCIDevice *pci_register_device(PCIBus *bus, const char *name,
     pci_dev->devfn = devfn;
     pstrcpy(pci_dev->name, sizeof(pci_dev->name), name);
     memset(pci_dev->irq_state, 0, sizeof(pci_dev->irq_state));
+    pci_set_default_subsystem_id(pci_dev);
 
     if (!config_read)
         config_read = pci_default_read_config;

hw/pci.h

@@ -8,6 +8,15 @@
 
 extern target_phys_addr_t pci_mem_base;
 
+/* see pci-ids.txt */
+#define PCI_VENDOR_ID_REDHAT_QUMRANET    0x1af4
+#define PCI_SUBVENDOR_ID_REDHAT_QUMRANET 0x1af4
+#define PCI_SUBDEVICE_ID_QEMU            0x1100
+
+#define PCI_DEVICE_ID_VIRTIO_NET         0x1000
+#define PCI_DEVICE_ID_VIRTIO_BLOCK       0x1001
+#define PCI_DEVICE_ID_VIRTIO_BALLOON     0x1002
+
 typedef void PCIConfigWriteFunc(PCIDevice *pci_dev,
                                 uint32_t address, uint32_t data, int len);
 typedef uint32_t PCIConfigReadFunc(PCIDevice *pci_dev,
@@ -36,7 +45,10 @@ typedef struct PCIIORegion {
 #define PCI_COMMAND		0x04	/* 16 bits */
 #define  PCI_COMMAND_IO		0x1	/* Enable response in I/O space */
 #define  PCI_COMMAND_MEMORY	0x2	/* Enable response in Memory space */
+#define PCI_REVISION            0x08
 #define PCI_CLASS_DEVICE        0x0a    /* Device class */
+#define PCI_SUBVENDOR_ID	0x2c	/* 16 bits */
+#define PCI_SUBDEVICE_ID	0x2e	/* 16 bits */
 #define PCI_INTERRUPT_LINE	0x3c	/* 8 bits */
 #define PCI_INTERRUPT_PIN	0x3d	/* 8 bits */
 #define PCI_MIN_GNT		0x3e	/* 8 bits */