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/*

 * Virtio PCI Bindings

 *

 * Copyright IBM, Corp. 2007

 * Copyright (c) 2009 CodeSourcery

 *

 * Authors:

 *  Anthony Liguori   <aliguori@us.ibm.com>

 *  Paul Brook        <paul@codesourcery.com>

 *

 * This work is licensed under the terms of the GNU GPL, version 2.  See

 * the COPYING file in the top-level directory.

 *

 */

#include <inttypes.h>

#include "virtio.h"

#include "pci.h"

//#include "sysemu.h"

#include "msix.h"

/* from Linux's linux/virtio_pci.h */

/* A 32-bit r/o bitmask of the features supported by the host */

#define VIRTIO_PCI_HOST_FEATURES        0

/* A 32-bit r/w bitmask of features activated by the guest */

#define VIRTIO_PCI_GUEST_FEATURES       4

/* A 32-bit r/w PFN for the currently selected queue */

#define VIRTIO_PCI_QUEUE_PFN            8

/* A 16-bit r/o queue size for the currently selected queue */

#define VIRTIO_PCI_QUEUE_NUM            12

/* A 16-bit r/w queue selector */

#define VIRTIO_PCI_QUEUE_SEL            14

/* A 16-bit r/w queue notifier */

#define VIRTIO_PCI_QUEUE_NOTIFY         16

/* An 8-bit device status register.  */

#define VIRTIO_PCI_STATUS               18

/* An 8-bit r/o interrupt status register.  Reading the value will return the

 * current contents of the ISR and will also clear it.  This is effectively

 * a read-and-acknowledge. */

#define VIRTIO_PCI_ISR                  19

/* 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

/* How many bits to shift physical queue address written to QUEUE_PFN.

 * 12 is historical, and due to x86 page size. */

#define VIRTIO_PCI_QUEUE_ADDR_SHIFT    12

/* QEMU doesn't strictly need write barriers since everything runs in

 * lock-step.  We'll leave the calls to wmb() in though to make it obvious for

 * KVM or if kqemu gets SMP support.

 */

#define wmb() do { } while (0)

/* PCI bindings.  */

typedef struct {

    PCIDevice pci_dev;

    VirtIODevice *vdev;

    uint32_t addr;

    uint16_t vendor;

    uint16_t device;

    uint16_t subvendor;

    uint16_t class_code;

    uint8_t pif;

} VirtIOPCIProxy;

/* virtio device */

static void virtio_pci_notify(void *opaque, uint16_t vector)

{

    VirtIOPCIProxy *proxy = opaque;

    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_save_config(void * opaque, QEMUFile *f)

{

    VirtIOPCIProxy *proxy = opaque;

    pci_device_save(&proxy->pci_dev, f);

    msix_save(&proxy->pci_dev, f);

    if (msix_present(&proxy->pci_dev))

        qemu_put_be16(f, proxy->vdev->config_vector);

}

static void virtio_pci_save_queue(void * opaque, int n, QEMUFile *f)

{

    VirtIOPCIProxy *proxy = opaque;

    if (msix_present(&proxy->pci_dev))

        qemu_put_be16(f, virtio_queue_vector(proxy->vdev, n));

}

static int virtio_pci_load_config(void * opaque, QEMUFile *f)

{

    VirtIOPCIProxy *proxy = opaque;

    int ret;

    ret = pci_device_load(&proxy->pci_dev, f);

    if (ret)

        return ret;

    msix_load(&proxy->pci_dev, f);

    if (msix_present(&proxy->pci_dev))

        qemu_get_be16s(f, &proxy->vdev->config_vector);

    return 0;

}

static int virtio_pci_load_queue(void * opaque, int n, QEMUFile *f)

{

    VirtIOPCIProxy *proxy = opaque;

    uint16_t vector;

    if (!msix_present(&proxy->pci_dev))

        return 0;

    qemu_get_be16s(f, &vector);

    virtio_queue_set_vector(proxy->vdev, n, vector);

    return 0;

}

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)

{

    VirtIOPCIProxy *proxy = opaque;

    VirtIODevice *vdev = proxy->vdev;

    target_phys_addr_t pa;

    switch (addr) {

    case VIRTIO_PCI_GUEST_FEATURES:

        /* Guest does not negotiate properly?  We have to assume nothing. */

        if (val & (1 << VIRTIO_F_BAD_FEATURE)) {

            if (vdev->bad_features)

                val = vdev->bad_features(vdev);

            else

                val = 0;

        }

        if (vdev->set_features)

            vdev->set_features(vdev, val);

        vdev->features = val;

        break;

    case VIRTIO_PCI_QUEUE_PFN:

        pa = (target_phys_addr_t)val << VIRTIO_PCI_QUEUE_ADDR_SHIFT;

        if (pa == 0)

            virtio_pci_reset(proxy);

        else

            virtio_queue_set_addr(vdev, vdev->queue_sel, pa);

        break;

    case VIRTIO_PCI_QUEUE_SEL:

        if (val < VIRTIO_PCI_QUEUE_MAX)

            vdev->queue_sel = val;

        break;

    case VIRTIO_PCI_QUEUE_NOTIFY:

        virtio_queue_notify(vdev, val);

        break;

    case VIRTIO_PCI_STATUS:

        vdev->status = val & 0xFF;

        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(VirtIOPCIProxy *proxy, uint32_t addr)

{

    VirtIODevice *vdev = proxy->vdev;

    uint32_t ret = 0xFFFFFFFF;

    switch (addr) {

    case VIRTIO_PCI_HOST_FEATURES:

        ret = vdev->get_features(vdev);

        ret |= (1 << VIRTIO_F_NOTIFY_ON_EMPTY);

        ret |= (1 << VIRTIO_RING_F_INDIRECT_DESC);

        ret |= (1 << VIRTIO_F_BAD_FEATURE);

        break;

    case VIRTIO_PCI_GUEST_FEATURES:

        ret = vdev->features;

        break;

    case VIRTIO_PCI_QUEUE_PFN:

        ret = virtio_queue_get_addr(vdev, vdev->queue_sel)

              >> VIRTIO_PCI_QUEUE_ADDR_SHIFT;

        break;

    case VIRTIO_PCI_QUEUE_NUM:

        ret = virtio_queue_get_num(vdev, vdev->queue_sel);

        break;

    case VIRTIO_PCI_QUEUE_SEL:

        ret = vdev->queue_sel;

        break;

    case VIRTIO_PCI_STATUS:

        ret = vdev->status;

        break;

    case VIRTIO_PCI_ISR:

        /* reading from the ISR also clears it. */

        ret = vdev->isr;

        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;

    }

    return ret;

}

static uint32_t virtio_pci_config_readb(void *opaque, uint32_t addr)

{

    VirtIOPCIProxy *proxy = opaque;

    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;

    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;

    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;

    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;

    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;

    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);

}

static void virtio_map(PCIDevice *pci_dev, int region_num,

                       uint32_t addr, uint32_t size, int type)

{

    VirtIOPCIProxy *proxy = container_of(pci_dev, VirtIOPCIProxy, pci_dev);

    VirtIODevice *vdev = proxy->vdev;

    unsigned config_len = VIRTIO_PCI_REGION_SIZE(pci_dev) + vdev->config_len;

    proxy->addr = addr;

    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 = {

    .notify = virtio_pci_notify,

    .save_config = virtio_pci_save_config,

    .load_config = virtio_pci_load_config,

    .save_queue = virtio_pci_save_queue,

    .load_queue = virtio_pci_load_queue,

};

static void virtio_init_pci(VirtIOPCIProxy *proxy, VirtIODevice *vdev,

                            uint16_t vendor, uint16_t device,

                            uint16_t class_code, uint8_t pif)

{

    uint8_t *config;

    uint32_t size;

    proxy->vdev = vdev;

    config = proxy->pci_dev.config;

    pci_config_set_vendor_id(config, vendor);

    pci_config_set_device_id(config, device);

    config[0x08] = VIRTIO_PCI_ABI_VERSION;

    config[0x09] = pif;

    pci_config_set_class(config, class_code);

    config[PCI_HEADER_TYPE] = PCI_HEADER_TYPE_NORMAL;

    config[0x2c] = vendor & 0xFF;

    config[0x2d] = (vendor >> 8) & 0xFF;

    config[0x2e] = vdev->device_id & 0xFF;

    config[0x2f] = (vdev->device_id >> 8) & 0xFF;

    config[0x3d] = 1;

    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);

    pci_register_bar(&proxy->pci_dev, 0, size, PCI_ADDRESS_SPACE_IO,

                           virtio_map);

    qemu_register_reset(virtio_pci_reset, proxy);

    virtio_bind_device(vdev, &virtio_pci_bindings, proxy);

}

static void virtio_blk_init_pci(PCIDevice *pci_dev)

{

    VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);

    VirtIODevice *vdev;

    vdev = virtio_blk_init(&pci_dev->qdev);

    virtio_init_pci(proxy, vdev,

                    PCI_VENDOR_ID_REDHAT_QUMRANET,

                    PCI_DEVICE_ID_VIRTIO_BLOCK,

                    PCI_CLASS_STORAGE_OTHER,

                    0x00);

}

static void virtio_console_init_pci(PCIDevice *pci_dev)

{

    VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);

    VirtIODevice *vdev;

    vdev = virtio_console_init(&pci_dev->qdev);

    virtio_init_pci(proxy, vdev,

                    PCI_VENDOR_ID_REDHAT_QUMRANET,

                    PCI_DEVICE_ID_VIRTIO_CONSOLE,

                    PCI_CLASS_DISPLAY_OTHER,

                    0x00);

}

static void virtio_net_init_pci(PCIDevice *pci_dev)

{

    VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);

    VirtIODevice *vdev;

    vdev = virtio_net_init(&pci_dev->qdev);

    virtio_init_pci(proxy, vdev,

                    PCI_VENDOR_ID_REDHAT_QUMRANET,

                    PCI_DEVICE_ID_VIRTIO_NET,

                    PCI_CLASS_NETWORK_ETHERNET,

                    0x00);

}

static void virtio_balloon_init_pci(PCIDevice *pci_dev)

{

    VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);

    VirtIODevice *vdev;

    vdev = virtio_balloon_init(&pci_dev->qdev);

    virtio_init_pci(proxy, vdev,

                    PCI_VENDOR_ID_REDHAT_QUMRANET,

                    PCI_DEVICE_ID_VIRTIO_BALLOON,

                    PCI_CLASS_MEMORY_RAM,

                    0x00);

}

static void virtio_pci_register_devices(void)

{

    pci_qdev_register("virtio-blk-pci", sizeof(VirtIOPCIProxy),

                      virtio_blk_init_pci);

    pci_qdev_register("virtio-net-pci", sizeof(VirtIOPCIProxy),

                      virtio_net_init_pci);

    pci_qdev_register("virtio-console-pci", sizeof(VirtIOPCIProxy),

                      virtio_console_init_pci);

    pci_qdev_register("virtio-balloon-pci", sizeof(VirtIOPCIProxy),

                      virtio_balloon_init_pci);

}

device_init(virtio_pci_register_devices)