hw/virtio/virtio-pci.h

   1 /*
   2  * Virtio PCI Bindings
   3  *
   4  * Copyright IBM, Corp. 2007
   5  * Copyright (c) 2009 CodeSourcery
   6  *
   7  * Authors:
   8  *  Anthony Liguori   <aliguori@us.ibm.com>
   9  *  Paul Brook        <paul@codesourcery.com>
  10  *
  11  * This work is licensed under the terms of the GNU GPL, version 2.  See
  12  * the COPYING file in the top-level directory.
  13  */
  14
  15 #ifndef QEMU_VIRTIO_PCI_H
  16 #define QEMU_VIRTIO_PCI_H
  17
  18 #include "hw/pci/msi.h"
  19 #include "hw/virtio/virtio-bus.h"
  20
  21 typedef struct VirtIOPCIProxy VirtIOPCIProxy;
  22
  23 /* virtio-pci-bus */
  24
  25 typedef struct VirtioBusState VirtioPCIBusState;
  26 typedef struct VirtioBusClass VirtioPCIBusClass;
  27
  28 #define TYPE_VIRTIO_PCI_BUS "virtio-pci-bus"
  29 #define VIRTIO_PCI_BUS(obj) \
  30         OBJECT_CHECK(VirtioPCIBusState, (obj), TYPE_VIRTIO_PCI_BUS)
  31 #define VIRTIO_PCI_BUS_GET_CLASS(obj) \
  32         OBJECT_GET_CLASS(VirtioPCIBusClass, obj, TYPE_VIRTIO_PCI_BUS)
  33 #define VIRTIO_PCI_BUS_CLASS(klass) \
  34         OBJECT_CLASS_CHECK(VirtioPCIBusClass, klass, TYPE_VIRTIO_PCI_BUS)
  35
  36 enum {
  37     VIRTIO_PCI_FLAG_BUS_MASTER_BUG_MIGRATION_BIT,
  38     VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT,
  39     VIRTIO_PCI_FLAG_MIGRATE_EXTRA_BIT,
  40     VIRTIO_PCI_FLAG_MODERN_PIO_NOTIFY_BIT,
  41     VIRTIO_PCI_FLAG_DISABLE_PCIE_BIT,
  42     VIRTIO_PCI_FLAG_PAGE_PER_VQ_BIT,
  43     VIRTIO_PCI_FLAG_ATS_BIT,
  44     VIRTIO_PCI_FLAG_INIT_DEVERR_BIT,
  45     VIRTIO_PCI_FLAG_INIT_LNKCTL_BIT,
  46     VIRTIO_PCI_FLAG_INIT_PM_BIT,
  47 };
  48
  49 /* Need to activate work-arounds for buggy guests at vmstate load. */
  50 #define VIRTIO_PCI_FLAG_BUS_MASTER_BUG_MIGRATION \
  51     (1 << VIRTIO_PCI_FLAG_BUS_MASTER_BUG_MIGRATION_BIT)
  52
  53 /* Performance improves when virtqueue kick processing is decoupled from the
  54  * vcpu thread using ioeventfd for some devices. */
  55 #define VIRTIO_PCI_FLAG_USE_IOEVENTFD   (1 << VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT)
  56
  57 /* virtio version flags */
  58 #define VIRTIO_PCI_FLAG_DISABLE_PCIE (1 << VIRTIO_PCI_FLAG_DISABLE_PCIE_BIT)
  59
  60 /* migrate extra state */
  61 #define VIRTIO_PCI_FLAG_MIGRATE_EXTRA (1 << VIRTIO_PCI_FLAG_MIGRATE_EXTRA_BIT)
  62
  63 /* have pio notification for modern device ? */
  64 #define VIRTIO_PCI_FLAG_MODERN_PIO_NOTIFY \
  65     (1 << VIRTIO_PCI_FLAG_MODERN_PIO_NOTIFY_BIT)
  66
  67 /* page per vq flag to be used by split drivers within guests */
  68 #define VIRTIO_PCI_FLAG_PAGE_PER_VQ \
  69     (1 << VIRTIO_PCI_FLAG_PAGE_PER_VQ_BIT)
  70
  71 /* address space translation service */
  72 #define VIRTIO_PCI_FLAG_ATS (1 << VIRTIO_PCI_FLAG_ATS_BIT)
  73
  74 /* Init error enabling flags */
  75 #define VIRTIO_PCI_FLAG_INIT_DEVERR (1 << VIRTIO_PCI_FLAG_INIT_DEVERR_BIT)
  76
  77 /* Init Link Control register */
  78 #define VIRTIO_PCI_FLAG_INIT_LNKCTL (1 << VIRTIO_PCI_FLAG_INIT_LNKCTL_BIT)
  79
  80 /* Init Power Management */
  81 #define VIRTIO_PCI_FLAG_INIT_PM (1 << VIRTIO_PCI_FLAG_INIT_PM_BIT)
  82
  83 typedef struct {
  84     MSIMessage msg;
  85     int virq;
  86     unsigned int users;
  87 } VirtIOIRQFD;
  88
  89 /*
  90  * virtio-pci: This is the PCIDevice which has a virtio-pci-bus.
  91  */
  92 #define TYPE_VIRTIO_PCI "virtio-pci"
  93 #define VIRTIO_PCI_GET_CLASS(obj) \
  94         OBJECT_GET_CLASS(VirtioPCIClass, obj, TYPE_VIRTIO_PCI)
  95 #define VIRTIO_PCI_CLASS(klass) \
  96         OBJECT_CLASS_CHECK(VirtioPCIClass, klass, TYPE_VIRTIO_PCI)
  97 #define VIRTIO_PCI(obj) \
  98         OBJECT_CHECK(VirtIOPCIProxy, (obj), TYPE_VIRTIO_PCI)
  99
 100 typedef struct VirtioPCIClass {
 101     PCIDeviceClass parent_class;
 102     DeviceRealize parent_dc_realize;
 103     void (*realize)(VirtIOPCIProxy *vpci_dev, Error **errp);
 104 } VirtioPCIClass;
 105
 106 typedef struct VirtIOPCIRegion {
 107     MemoryRegion mr;
 108     uint32_t offset;
 109     uint32_t size;
 110     uint32_t type;
 111 } VirtIOPCIRegion;
 112
 113 typedef struct VirtIOPCIQueue {
 114   uint16_t num;
 115   bool enabled;
 116   uint32_t desc[2];
 117   uint32_t avail[2];
 118   uint32_t used[2];
 119 } VirtIOPCIQueue;
 120
 121 struct VirtIOPCIProxy {
 122     PCIDevice pci_dev;
 123     MemoryRegion bar;
 124     union {
 125         struct {
 126             VirtIOPCIRegion common;
 127             VirtIOPCIRegion isr;
 128             VirtIOPCIRegion device;
 129             VirtIOPCIRegion notify;
 130             VirtIOPCIRegion notify_pio;
 131         };
 132         VirtIOPCIRegion regs[5];
 133     };
 134     MemoryRegion modern_bar;
 135     MemoryRegion io_bar;
 136     uint32_t legacy_io_bar_idx;
 137     uint32_t msix_bar_idx;
 138     uint32_t modern_io_bar_idx;
 139     uint32_t modern_mem_bar_idx;
 140     int config_cap;
 141     uint32_t flags;
 142     bool disable_modern;
 143     bool ignore_backend_features;
 144     OnOffAuto disable_legacy;
 145     uint32_t class_code;
 146     uint32_t nvectors;
 147     uint32_t dfselect;
 148     uint32_t gfselect;
 149     uint32_t guest_features[2];
 150     VirtIOPCIQueue vqs[VIRTIO_QUEUE_MAX];
 151
 152     VirtIOIRQFD *vector_irqfd;
 153     int nvqs_with_notifiers;
 154     VirtioBusState bus;
 155 };
 156
 157 static inline bool virtio_pci_modern(VirtIOPCIProxy *proxy)
 158 {
 159     return !proxy->disable_modern;
 160 }
 161
 162 static inline bool virtio_pci_legacy(VirtIOPCIProxy *proxy)
 163 {
 164     return proxy->disable_legacy == ON_OFF_AUTO_OFF;
 165 }
 166
 167 static inline void virtio_pci_force_virtio_1(VirtIOPCIProxy *proxy)
 168 {
 169     proxy->disable_modern = false;
 170     proxy->disable_legacy = ON_OFF_AUTO_ON;
 171 }
 172
 173 static inline void virtio_pci_disable_modern(VirtIOPCIProxy *proxy)
 174 {
 175     proxy->disable_modern = true;
 176 }
 177
 178 /*
 179  * virtio-input-pci: This extends VirtioPCIProxy.
 180  */
 181 #define TYPE_VIRTIO_INPUT_PCI "virtio-input-pci"
 182
 183 /* Virtio ABI version, if we increment this, we break the guest driver. */
 184 #define VIRTIO_PCI_ABI_VERSION          0
 185
 186 /* Input for virtio_pci_types_register() */
 187 typedef struct VirtioPCIDeviceTypeInfo {
 188     /*
 189      * Common base class for the subclasses below.
 190      *
 191      * Required only if transitional_name or non_transitional_name is set.
 192      *
 193      * We need a separate base type instead of making all types
 194      * inherit from generic_name for two reasons:
 195      * 1) generic_name implements INTERFACE_PCIE_DEVICE, but
 196      *    transitional_name does not.
 197      * 2) generic_name has the "disable-legacy" and "disable-modern"
 198      *    properties, transitional_name and non_transitional name don't.
 199      */
 200     const char *base_name;
 201     /*
 202      * Generic device type.  Optional.
 203      *
 204      * Supports both transitional and non-transitional modes,
 205      * using the disable-legacy and disable-modern properties.
 206      * If disable-legacy=auto, (non-)transitional mode is selected
 207      * depending on the bus where the device is plugged.
 208      *
 209      * Implements both INTERFACE_PCIE_DEVICE and INTERFACE_CONVENTIONAL_PCI_DEVICE,
 210      * but PCI Express is supported only in non-transitional mode.
 211      *
 212      * The only type implemented by QEMU 3.1 and older.
 213      */
 214     const char *generic_name;
 215     /*
 216      * The transitional device type.  Optional.
 217      *
 218      * Implements both INTERFACE_PCIE_DEVICE and INTERFACE_CONVENTIONAL_PCI_DEVICE.
 219      */
 220     const char *transitional_name;
 221     /*
 222      * The non-transitional device type.  Optional.
 223      *
 224      * Implements INTERFACE_CONVENTIONAL_PCI_DEVICE only.
 225      */
 226     const char *non_transitional_name;
 227
 228     /* Parent type.  If NULL, TYPE_VIRTIO_PCI is used */
 229     const char *parent;
 230
 231     /* Same as TypeInfo fields: */
 232     size_t instance_size;
 233     size_t class_size;
 234     void (*instance_init)(Object *obj);
 235     void (*class_init)(ObjectClass *klass, void *data);
 236 } VirtioPCIDeviceTypeInfo;
 237
 238 /* Register virtio-pci type(s).  @t must be static. */
 239 void virtio_pci_types_register(const VirtioPCIDeviceTypeInfo *t);
 240
 241 #endif