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qemu/virtio: MSI-X support in virtio PCI 

This enables actual support for MSI-X in virtio PCI.
First user will be virtio-net.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Michael S. Tsirkin 2009-06-21 19:50:26 +03:00 committed by Anthony Liguori
parent 7055e687cd
commit aba800a3ff
2 changed files with 113 additions and 41 deletions
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152
hw/virtio-pci.c
View File

@ -18,6 +18,7 @@
#include "virtio.h"
#include "pci.h"
//#include "sysemu.h"
#include "msix.h"
/* from Linux's linux/virtio_pci.h */
@ -47,7 +48,24 @@
* a read-and-acknowledge. */
#define VIRTIO_PCI_ISR 19
#define VIRTIO_PCI_CONFIG 20
/* MSI-X registers: only enabled if MSI-X is enabled. */
/* A 16-bit vector for configuration changes. */
#define VIRTIO_MSI_CONFIG_VECTOR 20
/* A 16-bit vector for selected queue notifications. */
#define VIRTIO_MSI_QUEUE_VECTOR 22
/* Config space size */
#define VIRTIO_PCI_CONFIG_NOMSI 20
#define VIRTIO_PCI_CONFIG_MSI 24
#define VIRTIO_PCI_REGION_SIZE(dev) (msix_present(dev) ? \
VIRTIO_PCI_CONFIG_MSI : \
VIRTIO_PCI_CONFIG_NOMSI)
/* The remaining space is defined by each driver as the per-driver
* configuration space */
#define VIRTIO_PCI_CONFIG(dev) (msix_enabled(dev) ? \
VIRTIO_PCI_CONFIG_MSI : \
VIRTIO_PCI_CONFIG_NOMSI)
/* Virtio ABI version, if we increment this, we break the guest driver. */
#define VIRTIO_PCI_ABI_VERSION 0
@ -81,14 +99,17 @@ typedef struct {
static void virtio_pci_notify(void *opaque, uint16_t vector)
{
VirtIOPCIProxy *proxy = opaque;
qemu_set_irq(proxy->pci_dev.irq[0], proxy->vdev->isr & 1);
if (msix_enabled(&proxy->pci_dev))
msix_notify(&proxy->pci_dev, vector);
else
qemu_set_irq(proxy->pci_dev.irq[0], proxy->vdev->isr & 1);
}
static void virtio_pci_reset(void *opaque)
{
VirtIOPCIProxy *proxy = opaque;
virtio_reset(proxy->vdev);
msix_reset(&proxy->pci_dev);
}
static void virtio_ioport_write(void *opaque, uint32_t addr, uint32_t val)
@ -97,8 +118,6 @@ static void virtio_ioport_write(void *opaque, uint32_t addr, uint32_t val)
VirtIODevice *vdev = proxy->vdev;
target_phys_addr_t pa;
addr -= proxy->addr;
switch (addr) {
case VIRTIO_PCI_GUEST_FEATURES:
/* Guest does not negotiate properly? We have to assume nothing. */
@ -131,17 +150,33 @@ static void virtio_ioport_write(void *opaque, uint32_t addr, uint32_t val)
if (vdev->status == 0)
virtio_pci_reset(proxy);
break;
case VIRTIO_MSI_CONFIG_VECTOR:
msix_vector_unuse(&proxy->pci_dev, vdev->config_vector);
/* Make it possible for guest to discover an error took place. */
if (msix_vector_use(&proxy->pci_dev, val) < 0)
val = VIRTIO_NO_VECTOR;
vdev->config_vector = val;
break;
case VIRTIO_MSI_QUEUE_VECTOR:
msix_vector_unuse(&proxy->pci_dev,
virtio_queue_vector(vdev, vdev->queue_sel));
/* Make it possible for guest to discover an error took place. */
if (msix_vector_use(&proxy->pci_dev, val) < 0)
val = VIRTIO_NO_VECTOR;
virtio_queue_set_vector(vdev, vdev->queue_sel, val);
break;
default:
fprintf(stderr, "%s: unexpected address 0x%x value 0x%x\n",
__func__, addr, val);
break;
}
}
static uint32_t virtio_ioport_read(void *opaque, uint32_t addr)
static uint32_t virtio_ioport_read(VirtIOPCIProxy *proxy, uint32_t addr)
{
VirtIOPCIProxy *proxy = opaque;
VirtIODevice *vdev = proxy->vdev;
uint32_t ret = 0xFFFFFFFF;
addr -= proxy->addr;
switch (addr) {
case VIRTIO_PCI_HOST_FEATURES:
ret = vdev->get_features(vdev);
@ -171,6 +206,12 @@ static uint32_t virtio_ioport_read(void *opaque, uint32_t addr)
vdev->isr = 0;
qemu_set_irq(proxy->pci_dev.irq[0], 0);
break;
case VIRTIO_MSI_CONFIG_VECTOR:
ret = vdev->config_vector;
break;
case VIRTIO_MSI_QUEUE_VECTOR:
ret = virtio_queue_vector(vdev, vdev->queue_sel);
break;
default:
break;
}
@ -181,42 +222,72 @@ static uint32_t virtio_ioport_read(void *opaque, uint32_t addr)
static uint32_t virtio_pci_config_readb(void *opaque, uint32_t addr)
{
VirtIOPCIProxy *proxy = opaque;
addr -= proxy->addr + VIRTIO_PCI_CONFIG;
uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev);
addr -= proxy->addr;
if (addr < config)
return virtio_ioport_read(proxy, addr);
addr -= config;
return virtio_config_readb(proxy->vdev, addr);
}
static uint32_t virtio_pci_config_readw(void *opaque, uint32_t addr)
{
VirtIOPCIProxy *proxy = opaque;
addr -= proxy->addr + VIRTIO_PCI_CONFIG;
uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev);
addr -= proxy->addr;
if (addr < config)
return virtio_ioport_read(proxy, addr);
addr -= config;
return virtio_config_readw(proxy->vdev, addr);
}
static uint32_t virtio_pci_config_readl(void *opaque, uint32_t addr)
{
VirtIOPCIProxy *proxy = opaque;
addr -= proxy->addr + VIRTIO_PCI_CONFIG;
uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev);
addr -= proxy->addr;
if (addr < config)
return virtio_ioport_read(proxy, addr);
addr -= config;
return virtio_config_readl(proxy->vdev, addr);
}
static void virtio_pci_config_writeb(void *opaque, uint32_t addr, uint32_t val)
{
VirtIOPCIProxy *proxy = opaque;
addr -= proxy->addr + VIRTIO_PCI_CONFIG;
uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev);
addr -= proxy->addr;
if (addr < config) {
virtio_ioport_write(proxy, addr, val);
return;
}
addr -= config;
virtio_config_writeb(proxy->vdev, addr, val);
}
static void virtio_pci_config_writew(void *opaque, uint32_t addr, uint32_t val)
{
VirtIOPCIProxy *proxy = opaque;
addr -= proxy->addr + VIRTIO_PCI_CONFIG;
uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev);
addr -= proxy->addr;
if (addr < config) {
virtio_ioport_write(proxy, addr, val);
return;
}
addr -= config;
virtio_config_writew(proxy->vdev, addr, val);
}
static void virtio_pci_config_writel(void *opaque, uint32_t addr, uint32_t val)
{
VirtIOPCIProxy *proxy = opaque;
addr -= proxy->addr + VIRTIO_PCI_CONFIG;
uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev);
addr -= proxy->addr;
if (addr < config) {
virtio_ioport_write(proxy, addr, val);
return;
}
addr -= config;
virtio_config_writel(proxy->vdev, addr, val);
}
@ -225,32 +296,26 @@ static void virtio_map(PCIDevice *pci_dev, int region_num,
{
VirtIOPCIProxy *proxy = container_of(pci_dev, VirtIOPCIProxy, pci_dev);
VirtIODevice *vdev = proxy->vdev;
int i;
unsigned config_len = VIRTIO_PCI_REGION_SIZE(pci_dev) + vdev->config_len;
proxy->addr = addr;
for (i = 0; i < 3; i++) {
register_ioport_write(addr, VIRTIO_PCI_CONFIG, 1 << i,
virtio_ioport_write, proxy);
register_ioport_read(addr, VIRTIO_PCI_CONFIG, 1 << i,
virtio_ioport_read, proxy);
}
if (vdev->config_len) {
register_ioport_write(addr + VIRTIO_PCI_CONFIG, vdev->config_len, 1,
virtio_pci_config_writeb, proxy);
register_ioport_write(addr + VIRTIO_PCI_CONFIG, vdev->config_len, 2,
virtio_pci_config_writew, proxy);
register_ioport_write(addr + VIRTIO_PCI_CONFIG, vdev->config_len, 4,
virtio_pci_config_writel, proxy);
register_ioport_read(addr + VIRTIO_PCI_CONFIG, vdev->config_len, 1,
virtio_pci_config_readb, proxy);
register_ioport_read(addr + VIRTIO_PCI_CONFIG, vdev->config_len, 2,
virtio_pci_config_readw, proxy);
register_ioport_read(addr + VIRTIO_PCI_CONFIG, vdev->config_len, 4,
virtio_pci_config_readl, proxy);
register_ioport_write(addr, config_len, 1, virtio_pci_config_writeb, proxy);
register_ioport_write(addr, config_len, 2, virtio_pci_config_writew, proxy);
register_ioport_write(addr, config_len, 4, virtio_pci_config_writel, proxy);
register_ioport_read(addr, config_len, 1, virtio_pci_config_readb, proxy);
register_ioport_read(addr, config_len, 2, virtio_pci_config_readw, proxy);
register_ioport_read(addr, config_len, 4, virtio_pci_config_readl, proxy);
if (vdev->config_len)
vdev->get_config(vdev, vdev->config);
}
}
static void virtio_write_config(PCIDevice *pci_dev, uint32_t address,
uint32_t val, int len)
{
pci_default_write_config(pci_dev, address, val, len);
msix_write_config(pci_dev, address, val, len);
}
static const VirtIOBindings virtio_pci_bindings = {
@ -266,9 +331,6 @@ static void virtio_init_pci(VirtIOPCIProxy *proxy, VirtIODevice *vdev,
proxy->vdev = vdev;
/* No support for multiple vectors yet. */
proxy->vdev->nvectors = 0;
config = proxy->pci_dev.config;
pci_config_set_vendor_id(config, vendor);
pci_config_set_device_id(config, device);
@ -286,7 +348,17 @@ static void virtio_init_pci(VirtIOPCIProxy *proxy, VirtIODevice *vdev,
config[0x3d] = 1;
size = 20 + vdev->config_len;
if (vdev->nvectors && !msix_init(&proxy->pci_dev, vdev->nvectors, 1, 0)) {
pci_register_bar(&proxy->pci_dev, 1,
msix_bar_size(&proxy->pci_dev),
PCI_ADDRESS_SPACE_MEM,
msix_mmio_map);
proxy->pci_dev.config_write = virtio_write_config;
proxy->pci_dev.unregister = msix_uninit;
} else
vdev->nvectors = 0;
size = VIRTIO_PCI_REGION_SIZE(&proxy->pci_dev) + vdev->config_len;
if (size & (size-1))
size = 1 << qemu_fls(size);

2
rules.mak
View File

@ -1,6 +1,6 @@
%.o: %.c
$(call quiet-command,$(CC) $(CPPFLAGS) $(CFLAGS) -c -o $@ $<," CC $(TARGET_DIR)$@")
$(call quiet-command,$(CC) $(CPPFLAGS) $(CFLAGS) -Werror -Wno-error=uninitialized -c -o $@ $<," CC $(TARGET_DIR)$@")
%.o: %.S
$(call quiet-command,$(CC) $(CPPFLAGS) -c -o $@ $<," AS $(TARGET_DIR)$@")