mirror of https://gitee.com/openkylin/qemu.git
534 lines
16 KiB
C
534 lines
16 KiB
C
/*
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* Virtio MMIO bindings
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*
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* Copyright (c) 2011 Linaro Limited
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*
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* Author:
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* Peter Maydell <peter.maydell@linaro.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "qemu/osdep.h"
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#include "standard-headers/linux/virtio_mmio.h"
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#include "hw/sysbus.h"
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#include "hw/virtio/virtio.h"
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#include "qemu/host-utils.h"
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#include "sysemu/kvm.h"
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#include "hw/virtio/virtio-bus.h"
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#include "qemu/error-report.h"
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/* #define DEBUG_VIRTIO_MMIO */
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#ifdef DEBUG_VIRTIO_MMIO
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#define DPRINTF(fmt, ...) \
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do { printf("virtio_mmio: " fmt , ## __VA_ARGS__); } while (0)
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#else
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#define DPRINTF(fmt, ...) do {} while (0)
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#endif
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/* QOM macros */
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/* virtio-mmio-bus */
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#define TYPE_VIRTIO_MMIO_BUS "virtio-mmio-bus"
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#define VIRTIO_MMIO_BUS(obj) \
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OBJECT_CHECK(VirtioBusState, (obj), TYPE_VIRTIO_MMIO_BUS)
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#define VIRTIO_MMIO_BUS_GET_CLASS(obj) \
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OBJECT_GET_CLASS(VirtioBusClass, (obj), TYPE_VIRTIO_MMIO_BUS)
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#define VIRTIO_MMIO_BUS_CLASS(klass) \
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OBJECT_CLASS_CHECK(VirtioBusClass, (klass), TYPE_VIRTIO_MMIO_BUS)
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/* virtio-mmio */
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#define TYPE_VIRTIO_MMIO "virtio-mmio"
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#define VIRTIO_MMIO(obj) \
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OBJECT_CHECK(VirtIOMMIOProxy, (obj), TYPE_VIRTIO_MMIO)
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#define VIRT_MAGIC 0x74726976 /* 'virt' */
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#define VIRT_VERSION 1
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#define VIRT_VENDOR 0x554D4551 /* 'QEMU' */
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typedef struct {
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/* Generic */
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SysBusDevice parent_obj;
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MemoryRegion iomem;
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qemu_irq irq;
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/* Guest accessible state needing migration and reset */
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uint32_t host_features_sel;
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uint32_t guest_features_sel;
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uint32_t guest_page_shift;
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/* virtio-bus */
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VirtioBusState bus;
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bool format_transport_address;
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} VirtIOMMIOProxy;
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static bool virtio_mmio_ioeventfd_enabled(DeviceState *d)
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{
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return kvm_eventfds_enabled();
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}
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static int virtio_mmio_ioeventfd_assign(DeviceState *d,
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EventNotifier *notifier,
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int n, bool assign)
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{
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VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d);
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if (assign) {
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memory_region_add_eventfd(&proxy->iomem, VIRTIO_MMIO_QUEUE_NOTIFY, 4,
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true, n, notifier);
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} else {
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memory_region_del_eventfd(&proxy->iomem, VIRTIO_MMIO_QUEUE_NOTIFY, 4,
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true, n, notifier);
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}
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return 0;
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}
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static void virtio_mmio_start_ioeventfd(VirtIOMMIOProxy *proxy)
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{
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virtio_bus_start_ioeventfd(&proxy->bus);
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}
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static void virtio_mmio_stop_ioeventfd(VirtIOMMIOProxy *proxy)
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{
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virtio_bus_stop_ioeventfd(&proxy->bus);
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}
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static uint64_t virtio_mmio_read(void *opaque, hwaddr offset, unsigned size)
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{
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VirtIOMMIOProxy *proxy = (VirtIOMMIOProxy *)opaque;
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VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
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DPRINTF("virtio_mmio_read offset 0x%x\n", (int)offset);
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if (!vdev) {
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/* If no backend is present, we treat most registers as
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* read-as-zero, except for the magic number, version and
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* vendor ID. This is not strictly sanctioned by the virtio
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* spec, but it allows us to provide transports with no backend
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* plugged in which don't confuse Linux's virtio code: the
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* probe won't complain about the bad magic number, but the
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* device ID of zero means no backend will claim it.
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*/
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switch (offset) {
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case VIRTIO_MMIO_MAGIC_VALUE:
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return VIRT_MAGIC;
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case VIRTIO_MMIO_VERSION:
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return VIRT_VERSION;
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case VIRTIO_MMIO_VENDOR_ID:
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return VIRT_VENDOR;
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default:
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return 0;
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}
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}
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if (offset >= VIRTIO_MMIO_CONFIG) {
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offset -= VIRTIO_MMIO_CONFIG;
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switch (size) {
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case 1:
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return virtio_config_readb(vdev, offset);
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case 2:
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return virtio_config_readw(vdev, offset);
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case 4:
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return virtio_config_readl(vdev, offset);
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default:
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abort();
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}
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}
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if (size != 4) {
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DPRINTF("wrong size access to register!\n");
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return 0;
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}
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switch (offset) {
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case VIRTIO_MMIO_MAGIC_VALUE:
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return VIRT_MAGIC;
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case VIRTIO_MMIO_VERSION:
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return VIRT_VERSION;
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case VIRTIO_MMIO_DEVICE_ID:
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return vdev->device_id;
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case VIRTIO_MMIO_VENDOR_ID:
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return VIRT_VENDOR;
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case VIRTIO_MMIO_DEVICE_FEATURES:
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if (proxy->host_features_sel) {
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return 0;
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}
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return vdev->host_features;
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case VIRTIO_MMIO_QUEUE_NUM_MAX:
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if (!virtio_queue_get_num(vdev, vdev->queue_sel)) {
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return 0;
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}
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return VIRTQUEUE_MAX_SIZE;
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case VIRTIO_MMIO_QUEUE_PFN:
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return virtio_queue_get_addr(vdev, vdev->queue_sel)
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>> proxy->guest_page_shift;
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case VIRTIO_MMIO_INTERRUPT_STATUS:
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return atomic_read(&vdev->isr);
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case VIRTIO_MMIO_STATUS:
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return vdev->status;
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case VIRTIO_MMIO_DEVICE_FEATURES_SEL:
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case VIRTIO_MMIO_DRIVER_FEATURES:
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case VIRTIO_MMIO_DRIVER_FEATURES_SEL:
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case VIRTIO_MMIO_GUEST_PAGE_SIZE:
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case VIRTIO_MMIO_QUEUE_SEL:
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case VIRTIO_MMIO_QUEUE_NUM:
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case VIRTIO_MMIO_QUEUE_ALIGN:
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case VIRTIO_MMIO_QUEUE_NOTIFY:
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case VIRTIO_MMIO_INTERRUPT_ACK:
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DPRINTF("read of write-only register\n");
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return 0;
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default:
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DPRINTF("bad register offset\n");
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return 0;
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}
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return 0;
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}
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static void virtio_mmio_write(void *opaque, hwaddr offset, uint64_t value,
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unsigned size)
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{
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VirtIOMMIOProxy *proxy = (VirtIOMMIOProxy *)opaque;
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VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
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DPRINTF("virtio_mmio_write offset 0x%x value 0x%" PRIx64 "\n",
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(int)offset, value);
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if (!vdev) {
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/* If no backend is present, we just make all registers
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* write-ignored. This allows us to provide transports with
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* no backend plugged in.
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*/
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return;
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}
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if (offset >= VIRTIO_MMIO_CONFIG) {
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offset -= VIRTIO_MMIO_CONFIG;
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switch (size) {
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case 1:
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virtio_config_writeb(vdev, offset, value);
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break;
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case 2:
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virtio_config_writew(vdev, offset, value);
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break;
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case 4:
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virtio_config_writel(vdev, offset, value);
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break;
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default:
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abort();
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}
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return;
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}
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if (size != 4) {
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DPRINTF("wrong size access to register!\n");
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return;
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}
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switch (offset) {
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case VIRTIO_MMIO_DEVICE_FEATURES_SEL:
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proxy->host_features_sel = value;
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break;
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case VIRTIO_MMIO_DRIVER_FEATURES:
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if (!proxy->guest_features_sel) {
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virtio_set_features(vdev, value);
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}
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break;
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case VIRTIO_MMIO_DRIVER_FEATURES_SEL:
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proxy->guest_features_sel = value;
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break;
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case VIRTIO_MMIO_GUEST_PAGE_SIZE:
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proxy->guest_page_shift = ctz32(value);
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if (proxy->guest_page_shift > 31) {
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proxy->guest_page_shift = 0;
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}
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DPRINTF("guest page size %" PRIx64 " shift %d\n", value,
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proxy->guest_page_shift);
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break;
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case VIRTIO_MMIO_QUEUE_SEL:
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if (value < VIRTIO_QUEUE_MAX) {
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vdev->queue_sel = value;
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}
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break;
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case VIRTIO_MMIO_QUEUE_NUM:
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DPRINTF("mmio_queue write %d max %d\n", (int)value, VIRTQUEUE_MAX_SIZE);
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virtio_queue_set_num(vdev, vdev->queue_sel, value);
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/* Note: only call this function for legacy devices */
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virtio_queue_update_rings(vdev, vdev->queue_sel);
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break;
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case VIRTIO_MMIO_QUEUE_ALIGN:
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/* Note: this is only valid for legacy devices */
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virtio_queue_set_align(vdev, vdev->queue_sel, value);
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break;
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case VIRTIO_MMIO_QUEUE_PFN:
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if (value == 0) {
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virtio_reset(vdev);
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} else {
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virtio_queue_set_addr(vdev, vdev->queue_sel,
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value << proxy->guest_page_shift);
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}
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break;
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case VIRTIO_MMIO_QUEUE_NOTIFY:
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if (value < VIRTIO_QUEUE_MAX) {
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virtio_queue_notify(vdev, value);
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}
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break;
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case VIRTIO_MMIO_INTERRUPT_ACK:
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atomic_and(&vdev->isr, ~value);
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virtio_update_irq(vdev);
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break;
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case VIRTIO_MMIO_STATUS:
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if (!(value & VIRTIO_CONFIG_S_DRIVER_OK)) {
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virtio_mmio_stop_ioeventfd(proxy);
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}
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virtio_set_status(vdev, value & 0xff);
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if (value & VIRTIO_CONFIG_S_DRIVER_OK) {
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virtio_mmio_start_ioeventfd(proxy);
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}
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if (vdev->status == 0) {
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virtio_reset(vdev);
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}
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break;
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case VIRTIO_MMIO_MAGIC_VALUE:
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case VIRTIO_MMIO_VERSION:
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case VIRTIO_MMIO_DEVICE_ID:
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case VIRTIO_MMIO_VENDOR_ID:
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case VIRTIO_MMIO_DEVICE_FEATURES:
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case VIRTIO_MMIO_QUEUE_NUM_MAX:
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case VIRTIO_MMIO_INTERRUPT_STATUS:
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DPRINTF("write to readonly register\n");
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break;
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default:
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DPRINTF("bad register offset\n");
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}
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}
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static const MemoryRegionOps virtio_mem_ops = {
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.read = virtio_mmio_read,
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.write = virtio_mmio_write,
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.endianness = DEVICE_NATIVE_ENDIAN,
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};
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static void virtio_mmio_update_irq(DeviceState *opaque, uint16_t vector)
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{
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VirtIOMMIOProxy *proxy = VIRTIO_MMIO(opaque);
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VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
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int level;
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if (!vdev) {
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return;
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}
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level = (atomic_read(&vdev->isr) != 0);
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DPRINTF("virtio_mmio setting IRQ %d\n", level);
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qemu_set_irq(proxy->irq, level);
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}
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static int virtio_mmio_load_config(DeviceState *opaque, QEMUFile *f)
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{
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VirtIOMMIOProxy *proxy = VIRTIO_MMIO(opaque);
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proxy->host_features_sel = qemu_get_be32(f);
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proxy->guest_features_sel = qemu_get_be32(f);
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proxy->guest_page_shift = qemu_get_be32(f);
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return 0;
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}
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static void virtio_mmio_save_config(DeviceState *opaque, QEMUFile *f)
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{
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VirtIOMMIOProxy *proxy = VIRTIO_MMIO(opaque);
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qemu_put_be32(f, proxy->host_features_sel);
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qemu_put_be32(f, proxy->guest_features_sel);
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qemu_put_be32(f, proxy->guest_page_shift);
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}
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static void virtio_mmio_reset(DeviceState *d)
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{
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VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d);
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virtio_mmio_stop_ioeventfd(proxy);
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virtio_bus_reset(&proxy->bus);
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proxy->host_features_sel = 0;
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proxy->guest_features_sel = 0;
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proxy->guest_page_shift = 0;
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}
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static int virtio_mmio_set_guest_notifier(DeviceState *d, int n, bool assign,
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bool with_irqfd)
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{
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VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d);
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VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
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VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev);
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VirtQueue *vq = virtio_get_queue(vdev, n);
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EventNotifier *notifier = virtio_queue_get_guest_notifier(vq);
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if (assign) {
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int r = event_notifier_init(notifier, 0);
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if (r < 0) {
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return r;
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}
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virtio_queue_set_guest_notifier_fd_handler(vq, true, with_irqfd);
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} else {
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virtio_queue_set_guest_notifier_fd_handler(vq, false, with_irqfd);
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event_notifier_cleanup(notifier);
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}
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if (vdc->guest_notifier_mask && vdev->use_guest_notifier_mask) {
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vdc->guest_notifier_mask(vdev, n, !assign);
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}
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return 0;
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}
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static int virtio_mmio_set_guest_notifiers(DeviceState *d, int nvqs,
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bool assign)
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{
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VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d);
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VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
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/* TODO: need to check if kvm-arm supports irqfd */
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bool with_irqfd = false;
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int r, n;
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nvqs = MIN(nvqs, VIRTIO_QUEUE_MAX);
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for (n = 0; n < nvqs; n++) {
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if (!virtio_queue_get_num(vdev, n)) {
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break;
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}
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r = virtio_mmio_set_guest_notifier(d, n, assign, with_irqfd);
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if (r < 0) {
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goto assign_error;
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}
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}
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return 0;
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assign_error:
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/* We get here on assignment failure. Recover by undoing for VQs 0 .. n. */
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assert(assign);
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while (--n >= 0) {
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virtio_mmio_set_guest_notifier(d, n, !assign, false);
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}
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return r;
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}
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/* virtio-mmio device */
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static Property virtio_mmio_properties[] = {
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DEFINE_PROP_BOOL("format_transport_address", VirtIOMMIOProxy,
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format_transport_address, true),
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DEFINE_PROP_END_OF_LIST(),
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};
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static void virtio_mmio_realizefn(DeviceState *d, Error **errp)
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{
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VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d);
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SysBusDevice *sbd = SYS_BUS_DEVICE(d);
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qbus_create_inplace(&proxy->bus, sizeof(proxy->bus), TYPE_VIRTIO_MMIO_BUS,
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d, NULL);
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sysbus_init_irq(sbd, &proxy->irq);
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memory_region_init_io(&proxy->iomem, OBJECT(d), &virtio_mem_ops, proxy,
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TYPE_VIRTIO_MMIO, 0x200);
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sysbus_init_mmio(sbd, &proxy->iomem);
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}
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static void virtio_mmio_class_init(ObjectClass *klass, void *data)
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{
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DeviceClass *dc = DEVICE_CLASS(klass);
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dc->realize = virtio_mmio_realizefn;
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dc->reset = virtio_mmio_reset;
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set_bit(DEVICE_CATEGORY_MISC, dc->categories);
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dc->props = virtio_mmio_properties;
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}
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static const TypeInfo virtio_mmio_info = {
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.name = TYPE_VIRTIO_MMIO,
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.parent = TYPE_SYS_BUS_DEVICE,
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.instance_size = sizeof(VirtIOMMIOProxy),
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.class_init = virtio_mmio_class_init,
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};
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/* virtio-mmio-bus. */
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static char *virtio_mmio_bus_get_dev_path(DeviceState *dev)
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{
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BusState *virtio_mmio_bus;
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VirtIOMMIOProxy *virtio_mmio_proxy;
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char *proxy_path;
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SysBusDevice *proxy_sbd;
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char *path;
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virtio_mmio_bus = qdev_get_parent_bus(dev);
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virtio_mmio_proxy = VIRTIO_MMIO(virtio_mmio_bus->parent);
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proxy_path = qdev_get_dev_path(DEVICE(virtio_mmio_proxy));
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/*
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* If @format_transport_address is false, then we just perform the same as
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* virtio_bus_get_dev_path(): we delegate the address formatting for the
|
|
* device on the virtio-mmio bus to the bus that the virtio-mmio proxy
|
|
* (i.e., the device that implements the virtio-mmio bus) resides on. In
|
|
* this case the base address of the virtio-mmio transport will be
|
|
* invisible.
|
|
*/
|
|
if (!virtio_mmio_proxy->format_transport_address) {
|
|
return proxy_path;
|
|
}
|
|
|
|
/* Otherwise, we append the base address of the transport. */
|
|
proxy_sbd = SYS_BUS_DEVICE(virtio_mmio_proxy);
|
|
assert(proxy_sbd->num_mmio == 1);
|
|
assert(proxy_sbd->mmio[0].memory == &virtio_mmio_proxy->iomem);
|
|
|
|
if (proxy_path) {
|
|
path = g_strdup_printf("%s/virtio-mmio@" TARGET_FMT_plx, proxy_path,
|
|
proxy_sbd->mmio[0].addr);
|
|
} else {
|
|
path = g_strdup_printf("virtio-mmio@" TARGET_FMT_plx,
|
|
proxy_sbd->mmio[0].addr);
|
|
}
|
|
g_free(proxy_path);
|
|
return path;
|
|
}
|
|
|
|
static void virtio_mmio_bus_class_init(ObjectClass *klass, void *data)
|
|
{
|
|
BusClass *bus_class = BUS_CLASS(klass);
|
|
VirtioBusClass *k = VIRTIO_BUS_CLASS(klass);
|
|
|
|
k->notify = virtio_mmio_update_irq;
|
|
k->save_config = virtio_mmio_save_config;
|
|
k->load_config = virtio_mmio_load_config;
|
|
k->set_guest_notifiers = virtio_mmio_set_guest_notifiers;
|
|
k->ioeventfd_enabled = virtio_mmio_ioeventfd_enabled;
|
|
k->ioeventfd_assign = virtio_mmio_ioeventfd_assign;
|
|
k->has_variable_vring_alignment = true;
|
|
bus_class->max_dev = 1;
|
|
bus_class->get_dev_path = virtio_mmio_bus_get_dev_path;
|
|
}
|
|
|
|
static const TypeInfo virtio_mmio_bus_info = {
|
|
.name = TYPE_VIRTIO_MMIO_BUS,
|
|
.parent = TYPE_VIRTIO_BUS,
|
|
.instance_size = sizeof(VirtioBusState),
|
|
.class_init = virtio_mmio_bus_class_init,
|
|
};
|
|
|
|
static void virtio_mmio_register_types(void)
|
|
{
|
|
type_register_static(&virtio_mmio_bus_info);
|
|
type_register_static(&virtio_mmio_info);
|
|
}
|
|
|
|
type_init(virtio_mmio_register_types)
|