piix: create host bridge to passthrough
Implement a pci host bridge specific to passthrough. Actually this just inherits the standard one. And we also just expose a minimal real host bridge pci configuration subset. [Replace pread with lseek and read to fix Windows build] Signed-off-by: Tiejun Chen <tiejun.chen@intel.com> Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Acked-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
parent
76d39ab49e
commit
595a4f07d6
@ -739,6 +739,90 @@ static const TypeInfo i440fx_info = {
|
||||
.class_init = i440fx_class_init,
|
||||
};
|
||||
|
||||
/* IGD Passthrough Host Bridge. */
|
||||
typedef struct {
|
||||
uint8_t offset;
|
||||
uint8_t len;
|
||||
} IGDHostInfo;
|
||||
|
||||
/* Here we just expose minimal host bridge offset subset. */
|
||||
static const IGDHostInfo igd_host_bridge_infos[] = {
|
||||
{0x08, 2}, /* revision id */
|
||||
{0x2c, 2}, /* sybsystem vendor id */
|
||||
{0x2e, 2}, /* sybsystem id */
|
||||
{0x50, 2}, /* SNB: processor graphics control register */
|
||||
{0x52, 2}, /* processor graphics control register */
|
||||
{0xa4, 4}, /* SNB: graphics base of stolen memory */
|
||||
{0xa8, 4}, /* SNB: base of GTT stolen memory */
|
||||
};
|
||||
|
||||
static int host_pci_config_read(int pos, int len, uint32_t val)
|
||||
{
|
||||
char path[PATH_MAX];
|
||||
int config_fd;
|
||||
ssize_t size = sizeof(path);
|
||||
/* Access real host bridge. */
|
||||
int rc = snprintf(path, size, "/sys/bus/pci/devices/%04x:%02x:%02x.%d/%s",
|
||||
0, 0, 0, 0, "config");
|
||||
|
||||
if (rc >= size || rc < 0) {
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
config_fd = open(path, O_RDWR);
|
||||
if (config_fd < 0) {
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
if (lseek(config_fd, pos, SEEK_SET) != pos) {
|
||||
return -errno;
|
||||
}
|
||||
do {
|
||||
rc = read(config_fd, (uint8_t *)&val, len);
|
||||
} while (rc < 0 && (errno == EINTR || errno == EAGAIN));
|
||||
if (rc != len) {
|
||||
return -errno;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int igd_pt_i440fx_initfn(struct PCIDevice *pci_dev)
|
||||
{
|
||||
uint32_t val = 0;
|
||||
int rc, i, num;
|
||||
int pos, len;
|
||||
|
||||
num = ARRAY_SIZE(igd_host_bridge_infos);
|
||||
for (i = 0; i < num; i++) {
|
||||
pos = igd_host_bridge_infos[i].offset;
|
||||
len = igd_host_bridge_infos[i].len;
|
||||
rc = host_pci_config_read(pos, len, val);
|
||||
if (rc) {
|
||||
return -ENODEV;
|
||||
}
|
||||
pci_default_write_config(pci_dev, pos, val, len);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void igd_passthrough_i440fx_class_init(ObjectClass *klass, void *data)
|
||||
{
|
||||
DeviceClass *dc = DEVICE_CLASS(klass);
|
||||
PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
|
||||
|
||||
k->init = igd_pt_i440fx_initfn;
|
||||
dc->desc = "IGD Passthrough Host bridge";
|
||||
}
|
||||
|
||||
static const TypeInfo igd_passthrough_i440fx_info = {
|
||||
.name = TYPE_IGD_PASSTHROUGH_I440FX_PCI_DEVICE,
|
||||
.parent = TYPE_I440FX_PCI_DEVICE,
|
||||
.instance_size = sizeof(PCII440FXState),
|
||||
.class_init = igd_passthrough_i440fx_class_init,
|
||||
};
|
||||
|
||||
static const char *i440fx_pcihost_root_bus_path(PCIHostState *host_bridge,
|
||||
PCIBus *rootbus)
|
||||
{
|
||||
@ -780,6 +864,7 @@ static const TypeInfo i440fx_pcihost_info = {
|
||||
static void i440fx_register_types(void)
|
||||
{
|
||||
type_register_static(&i440fx_info);
|
||||
type_register_static(&igd_passthrough_i440fx_info);
|
||||
type_register_static(&piix3_pci_type_info);
|
||||
type_register_static(&piix3_info);
|
||||
type_register_static(&piix3_xen_info);
|
||||
|
@ -222,6 +222,8 @@ typedef struct PCII440FXState PCII440FXState;
|
||||
#define TYPE_I440FX_PCI_HOST_BRIDGE "i440FX-pcihost"
|
||||
#define TYPE_I440FX_PCI_DEVICE "i440FX"
|
||||
|
||||
#define TYPE_IGD_PASSTHROUGH_I440FX_PCI_DEVICE "igd-passthrough-i440FX"
|
||||
|
||||
PCIBus *i440fx_init(const char *host_type, const char *pci_type,
|
||||
PCII440FXState **pi440fx_state, int *piix_devfn,
|
||||
ISABus **isa_bus, qemu_irq *pic,
|
||||
|
Loading…
Reference in New Issue
Block a user