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 VIRTIO_PCI_FLAG_PM_NO_SOFT_RESET_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 /* Init The No_Soft_Reset bit of Power Management */ 84 #define VIRTIO_PCI_FLAG_PM_NO_SOFT_RESET \ 85 (1 << VIRTIO_PCI_FLAG_PM_NO_SOFT_RESET_BIT) 86 87 /* Init Function Level Reset capability */ 88 #define VIRTIO_PCI_FLAG_INIT_FLR (1 << VIRTIO_PCI_FLAG_INIT_FLR_BIT) 89 90 /* Advanced Error Reporting capability */ 91 #define VIRTIO_PCI_FLAG_AER (1 << VIRTIO_PCI_FLAG_AER_BIT) 92 93 /* Page Aligned Address space Translation Service */ 94 #define VIRTIO_PCI_FLAG_ATS_PAGE_ALIGNED \ 95 (1 << VIRTIO_PCI_FLAG_ATS_PAGE_ALIGNED_BIT) 96 97 typedef struct { 98 MSIMessage msg; 99 int virq; 100 unsigned int users; 101 } VirtIOIRQFD; 102 103 /* 104 * virtio-pci: This is the PCIDevice which has a virtio-pci-bus. 105 */ 106 #define TYPE_VIRTIO_PCI "virtio-pci" 107 OBJECT_DECLARE_TYPE(VirtIOPCIProxy, VirtioPCIClass, VIRTIO_PCI) 108 109 struct VirtioPCIClass { 110 PCIDeviceClass parent_class; 111 DeviceRealize parent_dc_realize; 112 void (*realize)(VirtIOPCIProxy *vpci_dev, Error **errp); 113 }; 114 115 typedef struct VirtIOPCIRegion { 116 MemoryRegion mr; 117 uint32_t offset; 118 uint32_t size; 119 uint32_t type; 120 } VirtIOPCIRegion; 121 122 typedef struct VirtIOPCIQueue { 123 uint16_t num; 124 bool enabled; 125 /* 126 * No need to migrate the reset status, because it is always 0 127 * when the migration starts. 128 */ 129 bool reset; 130 uint32_t desc[2]; 131 uint32_t avail[2]; 132 uint32_t used[2]; 133 } VirtIOPCIQueue; 134 135 struct VirtIOPCIProxy { 136 PCIDevice pci_dev; 137 MemoryRegion bar; 138 union { 139 struct { 140 VirtIOPCIRegion common; 141 VirtIOPCIRegion isr; 142 VirtIOPCIRegion device; 143 VirtIOPCIRegion notify; 144 VirtIOPCIRegion notify_pio; 145 }; 146 VirtIOPCIRegion regs[5]; 147 }; 148 MemoryRegion modern_bar; 149 MemoryRegion io_bar; 150 uint32_t legacy_io_bar_idx; 151 uint32_t msix_bar_idx; 152 uint32_t modern_io_bar_idx; 153 uint32_t modern_mem_bar_idx; 154 int config_cap; 155 uint16_t last_pcie_cap_offset; 156 uint32_t flags; 157 bool disable_modern; 158 bool ignore_backend_features; 159 OnOffAuto disable_legacy; 160 /* Transitional device id */ 161 uint16_t trans_devid; 162 uint32_t class_code; 163 uint32_t nvectors; 164 uint32_t dfselect; 165 uint32_t gfselect; 166 uint32_t guest_features[2]; 167 VirtIOPCIQueue vqs[VIRTIO_QUEUE_MAX]; 168 169 VirtIOIRQFD *vector_irqfd; 170 int nvqs_with_notifiers; 171 VirtioBusState bus; 172 }; 173 174 static inline bool virtio_pci_modern(VirtIOPCIProxy *proxy) 175 { 176 return !proxy->disable_modern; 177 } 178 179 static inline bool virtio_pci_legacy(VirtIOPCIProxy *proxy) 180 { 181 return proxy->disable_legacy == ON_OFF_AUTO_OFF; 182 } 183 184 static inline void virtio_pci_force_virtio_1(VirtIOPCIProxy *proxy) 185 { 186 proxy->disable_modern = false; 187 proxy->disable_legacy = ON_OFF_AUTO_ON; 188 } 189 190 static inline void virtio_pci_disable_modern(VirtIOPCIProxy *proxy) 191 { 192 proxy->disable_modern = true; 193 } 194 195 uint16_t virtio_pci_get_trans_devid(uint16_t device_id); 196 uint16_t virtio_pci_get_class_id(uint16_t device_id); 197 198 /* 199 * virtio-input-pci: This extends VirtioPCIProxy. 200 */ 201 #define TYPE_VIRTIO_INPUT_PCI "virtio-input-pci" 202 203 /* Virtio ABI version, if we increment this, we break the guest driver. */ 204 #define VIRTIO_PCI_ABI_VERSION 0 205 206 /* Input for virtio_pci_types_register() */ 207 typedef struct VirtioPCIDeviceTypeInfo { 208 /* 209 * Common base class for the subclasses below. 210 * 211 * Required only if transitional_name or non_transitional_name is set. 212 * 213 * We need a separate base type instead of making all types 214 * inherit from generic_name for two reasons: 215 * 1) generic_name implements INTERFACE_PCIE_DEVICE, but 216 * transitional_name does not. 217 * 2) generic_name has the "disable-legacy" and "disable-modern" 218 * properties, transitional_name and non_transitional name don't. 219 */ 220 const char *base_name; 221 /* 222 * Generic device type. Optional. 223 * 224 * Supports both transitional and non-transitional modes, 225 * using the disable-legacy and disable-modern properties. 226 * If disable-legacy=auto, (non-)transitional mode is selected 227 * depending on the bus where the device is plugged. 228 * 229 * Implements both INTERFACE_PCIE_DEVICE and INTERFACE_CONVENTIONAL_PCI_DEVICE, 230 * but PCI Express is supported only in non-transitional mode. 231 * 232 * The only type implemented by QEMU 3.1 and older. 233 */ 234 const char *generic_name; 235 /* 236 * The transitional device type. Optional. 237 * 238 * Implements both INTERFACE_PCIE_DEVICE and INTERFACE_CONVENTIONAL_PCI_DEVICE. 239 */ 240 const char *transitional_name; 241 /* 242 * The non-transitional device type. Optional. 243 * 244 * Implements INTERFACE_CONVENTIONAL_PCI_DEVICE only. 245 */ 246 const char *non_transitional_name; 247 248 /* Parent type. If NULL, TYPE_VIRTIO_PCI is used */ 249 const char *parent; 250 251 /* Same as TypeInfo fields: */ 252 size_t instance_size; 253 size_t class_size; 254 void (*instance_init)(Object *obj); 255 void (*instance_finalize)(Object *obj); 256 void (*class_init)(ObjectClass *klass, void *data); 257 InterfaceInfo *interfaces; 258 } VirtioPCIDeviceTypeInfo; 259 260 /* Register virtio-pci type(s). @t must be static. */ 261 void virtio_pci_types_register(const VirtioPCIDeviceTypeInfo *t); 262 263 /** 264 * virtio_pci_optimal_num_queues: 265 * @fixed_queues: number of queues that are always present 266 * 267 * Returns: The optimal number of queues for a multi-queue device, excluding 268 * @fixed_queues. 269 */ 270 unsigned virtio_pci_optimal_num_queues(unsigned fixed_queues); 271 void virtio_pci_set_guest_notifier_fd_handler(VirtIODevice *vdev, VirtQueue *vq, 272 int n, bool assign, 273 bool with_irqfd); 274 275 int virtio_pci_add_shm_cap(VirtIOPCIProxy *proxy, uint8_t bar, uint64_t offset, 276 uint64_t length, uint8_t id); 277 278 #endif 279