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 /* 121 * No need to migrate the reset status, because it is always 0 122 * when the migration starts. 123 */ 124 bool reset; 125 uint32_t desc[2]; 126 uint32_t avail[2]; 127 uint32_t used[2]; 128 } VirtIOPCIQueue; 129 130 struct VirtIOPCIProxy { 131 PCIDevice pci_dev; 132 MemoryRegion bar; 133 union { 134 struct { 135 VirtIOPCIRegion common; 136 VirtIOPCIRegion isr; 137 VirtIOPCIRegion device; 138 VirtIOPCIRegion notify; 139 VirtIOPCIRegion notify_pio; 140 }; 141 VirtIOPCIRegion regs[5]; 142 }; 143 MemoryRegion modern_bar; 144 MemoryRegion io_bar; 145 uint32_t legacy_io_bar_idx; 146 uint32_t msix_bar_idx; 147 uint32_t modern_io_bar_idx; 148 uint32_t modern_mem_bar_idx; 149 int config_cap; 150 uint32_t flags; 151 bool disable_modern; 152 bool ignore_backend_features; 153 OnOffAuto disable_legacy; 154 uint32_t class_code; 155 uint32_t nvectors; 156 uint32_t dfselect; 157 uint32_t gfselect; 158 uint32_t guest_features[2]; 159 VirtIOPCIQueue vqs[VIRTIO_QUEUE_MAX]; 160 161 VirtIOIRQFD *vector_irqfd; 162 int nvqs_with_notifiers; 163 VirtioBusState bus; 164 }; 165 166 static inline bool virtio_pci_modern(VirtIOPCIProxy *proxy) 167 { 168 return !proxy->disable_modern; 169 } 170 171 static inline bool virtio_pci_legacy(VirtIOPCIProxy *proxy) 172 { 173 return proxy->disable_legacy == ON_OFF_AUTO_OFF; 174 } 175 176 static inline void virtio_pci_force_virtio_1(VirtIOPCIProxy *proxy) 177 { 178 proxy->disable_modern = false; 179 proxy->disable_legacy = ON_OFF_AUTO_ON; 180 } 181 182 static inline void virtio_pci_disable_modern(VirtIOPCIProxy *proxy) 183 { 184 proxy->disable_modern = true; 185 } 186 187 /* 188 * virtio-input-pci: This extends VirtioPCIProxy. 189 */ 190 #define TYPE_VIRTIO_INPUT_PCI "virtio-input-pci" 191 192 /* Virtio ABI version, if we increment this, we break the guest driver. */ 193 #define VIRTIO_PCI_ABI_VERSION 0 194 195 /* Input for virtio_pci_types_register() */ 196 typedef struct VirtioPCIDeviceTypeInfo { 197 /* 198 * Common base class for the subclasses below. 199 * 200 * Required only if transitional_name or non_transitional_name is set. 201 * 202 * We need a separate base type instead of making all types 203 * inherit from generic_name for two reasons: 204 * 1) generic_name implements INTERFACE_PCIE_DEVICE, but 205 * transitional_name does not. 206 * 2) generic_name has the "disable-legacy" and "disable-modern" 207 * properties, transitional_name and non_transitional name don't. 208 */ 209 const char *base_name; 210 /* 211 * Generic device type. Optional. 212 * 213 * Supports both transitional and non-transitional modes, 214 * using the disable-legacy and disable-modern properties. 215 * If disable-legacy=auto, (non-)transitional mode is selected 216 * depending on the bus where the device is plugged. 217 * 218 * Implements both INTERFACE_PCIE_DEVICE and INTERFACE_CONVENTIONAL_PCI_DEVICE, 219 * but PCI Express is supported only in non-transitional mode. 220 * 221 * The only type implemented by QEMU 3.1 and older. 222 */ 223 const char *generic_name; 224 /* 225 * The transitional device type. Optional. 226 * 227 * Implements both INTERFACE_PCIE_DEVICE and INTERFACE_CONVENTIONAL_PCI_DEVICE. 228 */ 229 const char *transitional_name; 230 /* 231 * The non-transitional device type. Optional. 232 * 233 * Implements INTERFACE_CONVENTIONAL_PCI_DEVICE only. 234 */ 235 const char *non_transitional_name; 236 237 /* Parent type. If NULL, TYPE_VIRTIO_PCI is used */ 238 const char *parent; 239 240 /* Same as TypeInfo fields: */ 241 size_t instance_size; 242 size_t class_size; 243 void (*instance_init)(Object *obj); 244 void (*class_init)(ObjectClass *klass, void *data); 245 InterfaceInfo *interfaces; 246 } VirtioPCIDeviceTypeInfo; 247 248 /* Register virtio-pci type(s). @t must be static. */ 249 void virtio_pci_types_register(const VirtioPCIDeviceTypeInfo *t); 250 251 /** 252 * virtio_pci_optimal_num_queues: 253 * @fixed_queues: number of queues that are always present 254 * 255 * Returns: The optimal number of queues for a multi-queue device, excluding 256 * @fixed_queues. 257 */ 258 unsigned virtio_pci_optimal_num_queues(unsigned fixed_queues); 259 260 #endif 261