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 #include "qom/object.h"
  21
  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 DECLARE_OBJ_CHECKERS(VirtioPCIBusState, VirtioPCIBusClass,
  30                      VIRTIO_PCI_BUS, TYPE_VIRTIO_PCI_BUS)
  31
  32 enum {
  33     VIRTIO_PCI_FLAG_BUS_MASTER_BUG_MIGRATION_BIT,
  34     VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT,
  35     VIRTIO_PCI_FLAG_MIGRATE_EXTRA_BIT,
  36     VIRTIO_PCI_FLAG_MODERN_PIO_NOTIFY_BIT,
  37     VIRTIO_PCI_FLAG_DISABLE_PCIE_BIT,
  38     VIRTIO_PCI_FLAG_PAGE_PER_VQ_BIT,
  39     VIRTIO_PCI_FLAG_ATS_BIT,
  40     VIRTIO_PCI_FLAG_INIT_DEVERR_BIT,
  41     VIRTIO_PCI_FLAG_INIT_LNKCTL_BIT,
  42     VIRTIO_PCI_FLAG_INIT_PM_BIT,
  43     VIRTIO_PCI_FLAG_INIT_FLR_BIT,
  44     VIRTIO_PCI_FLAG_AER_BIT,
  45     VIRTIO_PCI_FLAG_ATS_PAGE_ALIGNED_BIT,
  46 };
  47
  48 /* Need to activate work-arounds for buggy guests at vmstate load. */
  49 #define VIRTIO_PCI_FLAG_BUS_MASTER_BUG_MIGRATION \
  50     (1 << VIRTIO_PCI_FLAG_BUS_MASTER_BUG_MIGRATION_BIT)
  51
  52 /* Performance improves when virtqueue kick processing is decoupled from the
  53  * vcpu thread using ioeventfd for some devices. */
  54 #define VIRTIO_PCI_FLAG_USE_IOEVENTFD   (1 << VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT)
  55
  56 /* virtio version flags */
  57 #define VIRTIO_PCI_FLAG_DISABLE_PCIE (1 << VIRTIO_PCI_FLAG_DISABLE_PCIE_BIT)
  58
  59 /* migrate extra state */
  60 #define VIRTIO_PCI_FLAG_MIGRATE_EXTRA (1 << VIRTIO_PCI_FLAG_MIGRATE_EXTRA_BIT)
  61
  62 /* have pio notification for modern device ? */
  63 #define VIRTIO_PCI_FLAG_MODERN_PIO_NOTIFY \
  64     (1 << VIRTIO_PCI_FLAG_MODERN_PIO_NOTIFY_BIT)
  65
  66 /* page per vq flag to be used by split drivers within guests */
  67 #define VIRTIO_PCI_FLAG_PAGE_PER_VQ \
  68     (1 << VIRTIO_PCI_FLAG_PAGE_PER_VQ_BIT)
  69
  70 /* address space translation service */
  71 #define VIRTIO_PCI_FLAG_ATS (1 << VIRTIO_PCI_FLAG_ATS_BIT)
  72
  73 /* Init error enabling flags */
  74 #define VIRTIO_PCI_FLAG_INIT_DEVERR (1 << VIRTIO_PCI_FLAG_INIT_DEVERR_BIT)
  75
  76 /* Init Link Control register */
  77 #define VIRTIO_PCI_FLAG_INIT_LNKCTL (1 << VIRTIO_PCI_FLAG_INIT_LNKCTL_BIT)
  78
  79 /* Init Power Management */
  80 #define VIRTIO_PCI_FLAG_INIT_PM (1 << VIRTIO_PCI_FLAG_INIT_PM_BIT)
  81
  82 /* Init Function Level Reset capability */
  83 #define VIRTIO_PCI_FLAG_INIT_FLR (1 << VIRTIO_PCI_FLAG_INIT_FLR_BIT)
  84
  85 /* Advanced Error Reporting capability */
  86 #define VIRTIO_PCI_FLAG_AER (1 << VIRTIO_PCI_FLAG_AER_BIT)
  87
  88 /* Page Aligned Address space Translation Service */
  89 #define VIRTIO_PCI_FLAG_ATS_PAGE_ALIGNED \
  90   (1 << VIRTIO_PCI_FLAG_ATS_PAGE_ALIGNED_BIT)
  91
  92 typedef struct {
  93     MSIMessage msg;
  94     int virq;
  95     unsigned int users;
  96 } VirtIOIRQFD;
  97
  98 /*
  99  * virtio-pci: This is the PCIDevice which has a virtio-pci-bus.
 100  */
 101 #define TYPE_VIRTIO_PCI "virtio-pci"
 102 OBJECT_DECLARE_TYPE(VirtIOPCIProxy, VirtioPCIClass, VIRTIO_PCI)
 103
 104 struct VirtioPCIClass {
 105     PCIDeviceClass parent_class;
 106     DeviceRealize parent_dc_realize;
 107     void (*realize)(VirtIOPCIProxy *vpci_dev, Error **errp);
 108 };
 109
 110 typedef struct VirtIOPCIRegion {
 111     MemoryRegion mr;
 112     uint32_t offset;
 113     uint32_t size;
 114     uint32_t type;
 115 } VirtIOPCIRegion;
 116
 117 typedef struct VirtIOPCIQueue {
 118   uint16_t num;
 119   bool enabled;
 120   uint32_t desc[2];
 121   uint32_t avail[2];
 122   uint32_t used[2];
 123 } VirtIOPCIQueue;
 124
 125 struct VirtIOPCIProxy {
 126     PCIDevice pci_dev;
 127     MemoryRegion bar;
 128     union {
 129         struct {
 130             VirtIOPCIRegion common;
 131             VirtIOPCIRegion isr;
 132             VirtIOPCIRegion device;
 133             VirtIOPCIRegion notify;
 134             VirtIOPCIRegion notify_pio;
 135         };
 136         VirtIOPCIRegion regs[5];
 137     };
 138     MemoryRegion modern_bar;
 139     MemoryRegion io_bar;
 140     uint32_t legacy_io_bar_idx;
 141     uint32_t msix_bar_idx;
 142     uint32_t modern_io_bar_idx;
 143     uint32_t modern_mem_bar_idx;
 144     int config_cap;
 145     uint32_t flags;
 146     bool disable_modern;
 147     bool ignore_backend_features;
 148     OnOffAuto disable_legacy;
 149     uint32_t class_code;
 150     uint32_t nvectors;
 151     uint32_t dfselect;
 152     uint32_t gfselect;
 153     uint32_t guest_features[2];
 154     VirtIOPCIQueue vqs[VIRTIO_QUEUE_MAX];
 155
 156     VirtIOIRQFD *vector_irqfd;
 157     int nvqs_with_notifiers;
 158     VirtioBusState bus;
 159 };
 160
 161 static inline bool virtio_pci_modern(VirtIOPCIProxy *proxy)
 162 {
 163     return !proxy->disable_modern;
 164 }
 165
 166 static inline bool virtio_pci_legacy(VirtIOPCIProxy *proxy)
 167 {
 168     return proxy->disable_legacy == ON_OFF_AUTO_OFF;
 169 }
 170
 171 static inline void virtio_pci_force_virtio_1(VirtIOPCIProxy *proxy)
 172 {
 173     proxy->disable_modern = false;
 174     proxy->disable_legacy = ON_OFF_AUTO_ON;
 175 }
 176
 177 static inline void virtio_pci_disable_modern(VirtIOPCIProxy *proxy)
 178 {
 179     proxy->disable_modern = true;
 180 }
 181
 182 /*
 183  * virtio-input-pci: This extends VirtioPCIProxy.
 184  */
 185 #define TYPE_VIRTIO_INPUT_PCI "virtio-input-pci"
 186
 187 /* Virtio ABI version, if we increment this, we break the guest driver. */
 188 #define VIRTIO_PCI_ABI_VERSION          0
 189
 190 /* Input for virtio_pci_types_register() */
 191 typedef struct VirtioPCIDeviceTypeInfo {
 192     /*
 193      * Common base class for the subclasses below.
 194      *
 195      * Required only if transitional_name or non_transitional_name is set.
 196      *
 197      * We need a separate base type instead of making all types
 198      * inherit from generic_name for two reasons:
 199      * 1) generic_name implements INTERFACE_PCIE_DEVICE, but
 200      *    transitional_name does not.
 201      * 2) generic_name has the "disable-legacy" and "disable-modern"
 202      *    properties, transitional_name and non_transitional name don't.
 203      */
 204     const char *base_name;
 205     /*
 206      * Generic device type.  Optional.
 207      *
 208      * Supports both transitional and non-transitional modes,
 209      * using the disable-legacy and disable-modern properties.
 210      * If disable-legacy=auto, (non-)transitional mode is selected
 211      * depending on the bus where the device is plugged.
 212      *
 213      * Implements both INTERFACE_PCIE_DEVICE and INTERFACE_CONVENTIONAL_PCI_DEVICE,
 214      * but PCI Express is supported only in non-transitional mode.
 215      *
 216      * The only type implemented by QEMU 3.1 and older.
 217      */
 218     const char *generic_name;
 219     /*
 220      * The transitional device type.  Optional.
 221      *
 222      * Implements both INTERFACE_PCIE_DEVICE and INTERFACE_CONVENTIONAL_PCI_DEVICE.
 223      */
 224     const char *transitional_name;
 225     /*
 226      * The non-transitional device type.  Optional.
 227      *
 228      * Implements INTERFACE_CONVENTIONAL_PCI_DEVICE only.
 229      */
 230     const char *non_transitional_name;
 231
 232     /* Parent type.  If NULL, TYPE_VIRTIO_PCI is used */
 233     const char *parent;
 234
 235     /* Same as TypeInfo fields: */
 236     size_t instance_size;
 237     size_t class_size;
 238     void (*instance_init)(Object *obj);
 239     void (*class_init)(ObjectClass *klass, void *data);
 240     InterfaceInfo *interfaces;
 241 } VirtioPCIDeviceTypeInfo;
 242
 243 /* Register virtio-pci type(s).  @t must be static. */
 244 void virtio_pci_types_register(const VirtioPCIDeviceTypeInfo *t);
 245
 246 /**
 247  * virtio_pci_optimal_num_queues:
 248  * @fixed_queues: number of queues that are always present
 249  *
 250  * Returns: The optimal number of queues for a multi-queue device, excluding
 251  * @fixed_queues.
 252  */
 253 unsigned virtio_pci_optimal_num_queues(unsigned fixed_queues);
 254
 255 #endif