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/* virtio-pci.c - pci interface for virtio interface
*
* (c) Copyright 2008 Bull S.A.S.
*
* Author: Laurent Vivier <Laurent.Vivier@bull.net>
*
* some parts from Linux Virtio PCI driver
*
* Copyright IBM Corp. 2007
* Authors: Anthony Liguori <aliguori@us.ibm.com>
*
* Adopted for Seabios: Gleb Natapov <gleb@redhat.com>
*
* This work is licensed under the terms of the GNU LGPLv3
* See the COPYING file in the top-level directory.
*/
#include "config.h" // CONFIG_DEBUG_LEVEL
#include "malloc.h" // free
#include "output.h" // dprintf
#include "pci.h" // pci_config_readl
#include "pci_regs.h" // PCI_BASE_ADDRESS_0
#include "string.h" // memset
#include "virtio-pci.h"
#include "virtio-ring.h"
u64 vp_get_features(struct vp_device *vp)
{
u32 f0, f1;
if (vp->use_modern) {
vp_write(&vp->common, virtio_pci_common_cfg, device_feature_select, 0);
f0 = vp_read(&vp->common, virtio_pci_common_cfg, device_feature);
vp_write(&vp->common, virtio_pci_common_cfg, device_feature_select, 1);
f1 = vp_read(&vp->common, virtio_pci_common_cfg, device_feature);
} else {
f0 = vp_read(&vp->legacy, virtio_pci_legacy, host_features);
f1 = 0;
}
return ((u64)f1 << 32) | f0;
}
void vp_set_features(struct vp_device *vp, u64 features)
{
u32 f0, f1;
f0 = features;
f1 = features >> 32;
if (vp->use_modern) {
vp_write(&vp->common, virtio_pci_common_cfg, guest_feature_select, 0);
vp_write(&vp->common, virtio_pci_common_cfg, guest_feature, f0);
vp_write(&vp->common, virtio_pci_common_cfg, guest_feature_select, 1);
vp_write(&vp->common, virtio_pci_common_cfg, guest_feature, f1);
} else {
vp_write(&vp->legacy, virtio_pci_legacy, guest_features, f0);
}
}
u8 vp_get_status(struct vp_device *vp)
{
if (vp->use_modern) {
return vp_read(&vp->common, virtio_pci_common_cfg, device_status);
} else {
return vp_read(&vp->legacy, virtio_pci_legacy, status);
}
}
void vp_set_status(struct vp_device *vp, u8 status)
{
if (status == 0) /* reset */
return;
if (vp->use_modern) {
vp_write(&vp->common, virtio_pci_common_cfg, device_status, status);
} else {
vp_write(&vp->legacy, virtio_pci_legacy, status, status);
}
}
u8 vp_get_isr(struct vp_device *vp)
{
if (vp->use_modern) {
return vp_read(&vp->isr, virtio_pci_isr, isr);
} else {
return vp_read(&vp->legacy, virtio_pci_legacy, isr);
}
}
void vp_reset(struct vp_device *vp)
{
if (vp->use_modern) {
vp_write(&vp->common, virtio_pci_common_cfg, device_status, 0);
vp_read(&vp->isr, virtio_pci_isr, isr);
} else {
vp_write(&vp->legacy, virtio_pci_legacy, status, 0);
vp_read(&vp->legacy, virtio_pci_legacy, isr);
}
}
void vp_notify(struct vp_device *vp, struct vring_virtqueue *vq)
{
if (vp->use_modern) {
u32 addr = vp->notify.addr +
vq->queue_notify_off *
vp->notify_off_multiplier;
if (vp->notify.is_io) {
outw(vq->queue_index, addr);
} else {
writew((void*)addr, vq->queue_index);
}
dprintf(9, "vp notify %x (%d) -- 0x%x\n",
addr, 2, vq->queue_index);
} else {
vp_write(&vp->legacy, virtio_pci_legacy, queue_notify, vq->queue_index);
}
}
int vp_find_vq(struct vp_device *vp, int queue_index,
struct vring_virtqueue **p_vq)
{
u16 num;
ASSERT32FLAT();
struct vring_virtqueue *vq = *p_vq = memalign_high(PAGE_SIZE, sizeof(*vq));
if (!vq) {
warn_noalloc();
goto fail;
}
memset(vq, 0, sizeof(*vq));
/* select the queue */
if (vp->use_modern) {
vp_write(&vp->common, virtio_pci_common_cfg, queue_select, queue_index);
} else {
vp_write(&vp->legacy, virtio_pci_legacy, queue_sel, queue_index);
}
/* check if the queue is available */
if (vp->use_modern) {
num = vp_read(&vp->common, virtio_pci_common_cfg, queue_size);
if (num > MAX_QUEUE_NUM) {
vp_write(&vp->common, virtio_pci_common_cfg, queue_size,
MAX_QUEUE_NUM);
num = vp_read(&vp->common, virtio_pci_common_cfg, queue_size);
}
} else {
num = vp_read(&vp->legacy, virtio_pci_legacy, queue_num);
}
if (!num) {
dprintf(1, "ERROR: queue size is 0\n");
goto fail;
}
if (num > MAX_QUEUE_NUM) {
dprintf(1, "ERROR: queue size %d > %d\n", num, MAX_QUEUE_NUM);
goto fail;
}
/* check if the queue is already active */
if (vp->use_modern) {
if (vp_read(&vp->common, virtio_pci_common_cfg, queue_enable)) {
dprintf(1, "ERROR: queue already active\n");
goto fail;
}
} else {
if (vp_read(&vp->legacy, virtio_pci_legacy, queue_pfn)) {
dprintf(1, "ERROR: queue already active\n");
goto fail;
}
}
vq->queue_index = queue_index;
/* initialize the queue */
struct vring * vr = &vq->vring;
vring_init(vr, num, (unsigned char*)&vq->queue);
/* activate the queue
*
* NOTE: vr->desc is initialized by vring_init()
*/
if (vp->use_modern) {
vp_write(&vp->common, virtio_pci_common_cfg, queue_desc_lo,
(unsigned long)virt_to_phys(vr->desc));
vp_write(&vp->common, virtio_pci_common_cfg, queue_desc_hi, 0);
vp_write(&vp->common, virtio_pci_common_cfg, queue_avail_lo,
(unsigned long)virt_to_phys(vr->avail));
vp_write(&vp->common, virtio_pci_common_cfg, queue_avail_hi, 0);
vp_write(&vp->common, virtio_pci_common_cfg, queue_used_lo,
(unsigned long)virt_to_phys(vr->used));
vp_write(&vp->common, virtio_pci_common_cfg, queue_used_hi, 0);
vp_write(&vp->common, virtio_pci_common_cfg, queue_enable, 1);
vq->queue_notify_off = vp_read(&vp->common, virtio_pci_common_cfg,
queue_notify_off);
} else {
vp_write(&vp->legacy, virtio_pci_legacy, queue_pfn,
(unsigned long)virt_to_phys(vr->desc) >> PAGE_SHIFT);
}
return num;
fail:
free(vq);
*p_vq = NULL;
return -1;
}
void vp_init_simple(struct vp_device *vp, struct pci_device *pci)
{
u8 cap = pci_find_capability(pci, PCI_CAP_ID_VNDR, 0);
struct vp_cap *vp_cap;
u32 addr, offset, mul;
u8 type;
memset(vp, 0, sizeof(*vp));
while (cap != 0) {
type = pci_config_readb(pci->bdf, cap +
offsetof(struct virtio_pci_cap, cfg_type));
switch (type) {
case VIRTIO_PCI_CAP_COMMON_CFG:
vp_cap = &vp->common;
break;
case VIRTIO_PCI_CAP_NOTIFY_CFG:
vp_cap = &vp->notify;
mul = offsetof(struct virtio_pci_notify_cap, notify_off_multiplier);
vp->notify_off_multiplier = pci_config_readl(pci->bdf, cap + mul);
break;
case VIRTIO_PCI_CAP_ISR_CFG:
vp_cap = &vp->isr;
break;
case VIRTIO_PCI_CAP_DEVICE_CFG:
vp_cap = &vp->device;
break;
default:
vp_cap = NULL;
break;
}
if (vp_cap && !vp_cap->cap) {
vp_cap->cap = cap;
vp_cap->bar = pci_config_readb(pci->bdf, cap +
offsetof(struct virtio_pci_cap, bar));
offset = pci_config_readl(pci->bdf, cap +
offsetof(struct virtio_pci_cap, offset));
addr = pci_config_readl(pci->bdf, PCI_BASE_ADDRESS_0 + 4 * vp_cap->bar);
if (addr & PCI_BASE_ADDRESS_SPACE_IO) {
vp_cap->is_io = 1;
addr &= PCI_BASE_ADDRESS_IO_MASK;
} else {
vp_cap->is_io = 0;
addr &= PCI_BASE_ADDRESS_MEM_MASK;
}
vp_cap->addr = addr + offset;
dprintf(3, "pci dev %x:%x virtio cap at 0x%x type %d "
"bar %d at 0x%08x off +0x%04x [%s]\n",
pci_bdf_to_bus(pci->bdf), pci_bdf_to_dev(pci->bdf),
vp_cap->cap, type, vp_cap->bar, addr, offset,
vp_cap->is_io ? "io" : "mmio");
}
cap = pci_find_capability(pci, PCI_CAP_ID_VNDR, cap);
}
if (vp->common.cap && vp->notify.cap && vp->isr.cap && vp->device.cap) {
dprintf(1, "pci dev %x:%x using modern (1.0) virtio mode\n",
pci_bdf_to_bus(pci->bdf), pci_bdf_to_dev(pci->bdf));
vp->use_modern = 1;
} else {
dprintf(1, "pci dev %x:%x using legacy (0.9.5) virtio mode\n",
pci_bdf_to_bus(pci->bdf), pci_bdf_to_dev(pci->bdf));
vp->legacy.bar = 0;
vp->legacy.addr = pci_config_readl(pci->bdf, PCI_BASE_ADDRESS_0) &
PCI_BASE_ADDRESS_IO_MASK;
vp->legacy.is_io = 1;
}
vp_reset(vp);
pci_config_maskw(pci->bdf, PCI_COMMAND, 0, PCI_COMMAND_MASTER);
vp_set_status(vp, VIRTIO_CONFIG_S_ACKNOWLEDGE |
VIRTIO_CONFIG_S_DRIVER );
}
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