pcie_sriov.c (9290B)
1 /* 2 * pcie_sriov.c: 3 * 4 * Implementation of SR/IOV emulation support. 5 * 6 * Copyright (c) 2015-2017 Knut Omang <knut.omang@oracle.com> 7 * 8 * This work is licensed under the terms of the GNU GPL, version 2 or later. 9 * See the COPYING file in the top-level directory. 10 * 11 */ 12 13 #include "qemu/osdep.h" 14 #include "hw/pci/pci.h" 15 #include "hw/pci/pcie.h" 16 #include "hw/pci/pci_bus.h" 17 #include "hw/qdev-properties.h" 18 #include "qemu/error-report.h" 19 #include "qemu/range.h" 20 #include "qapi/error.h" 21 #include "trace.h" 22 23 static PCIDevice *register_vf(PCIDevice *pf, int devfn, 24 const char *name, uint16_t vf_num); 25 static void unregister_vfs(PCIDevice *dev); 26 27 void pcie_sriov_pf_init(PCIDevice *dev, uint16_t offset, 28 const char *vfname, uint16_t vf_dev_id, 29 uint16_t init_vfs, uint16_t total_vfs, 30 uint16_t vf_offset, uint16_t vf_stride) 31 { 32 uint8_t *cfg = dev->config + offset; 33 uint8_t *wmask; 34 35 pcie_add_capability(dev, PCI_EXT_CAP_ID_SRIOV, 1, 36 offset, PCI_EXT_CAP_SRIOV_SIZEOF); 37 dev->exp.sriov_cap = offset; 38 dev->exp.sriov_pf.num_vfs = 0; 39 dev->exp.sriov_pf.vfname = g_strdup(vfname); 40 dev->exp.sriov_pf.vf = NULL; 41 42 pci_set_word(cfg + PCI_SRIOV_VF_OFFSET, vf_offset); 43 pci_set_word(cfg + PCI_SRIOV_VF_STRIDE, vf_stride); 44 45 /* 46 * Mandatory page sizes to support. 47 * Device implementations can call pcie_sriov_pf_add_sup_pgsize() 48 * to set more bits: 49 */ 50 pci_set_word(cfg + PCI_SRIOV_SUP_PGSIZE, SRIOV_SUP_PGSIZE_MINREQ); 51 52 /* 53 * Default is to use 4K pages, software can modify it 54 * to any of the supported bits 55 */ 56 pci_set_word(cfg + PCI_SRIOV_SYS_PGSIZE, 0x1); 57 58 /* Set up device ID and initial/total number of VFs available */ 59 pci_set_word(cfg + PCI_SRIOV_VF_DID, vf_dev_id); 60 pci_set_word(cfg + PCI_SRIOV_INITIAL_VF, init_vfs); 61 pci_set_word(cfg + PCI_SRIOV_TOTAL_VF, total_vfs); 62 pci_set_word(cfg + PCI_SRIOV_NUM_VF, 0); 63 64 /* Write enable control bits */ 65 wmask = dev->wmask + offset; 66 pci_set_word(wmask + PCI_SRIOV_CTRL, 67 PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE | PCI_SRIOV_CTRL_ARI); 68 pci_set_word(wmask + PCI_SRIOV_NUM_VF, 0xffff); 69 pci_set_word(wmask + PCI_SRIOV_SYS_PGSIZE, 0x553); 70 71 qdev_prop_set_bit(&dev->qdev, "multifunction", true); 72 } 73 74 void pcie_sriov_pf_exit(PCIDevice *dev) 75 { 76 unregister_vfs(dev); 77 g_free((char *)dev->exp.sriov_pf.vfname); 78 dev->exp.sriov_pf.vfname = NULL; 79 } 80 81 void pcie_sriov_pf_init_vf_bar(PCIDevice *dev, int region_num, 82 uint8_t type, dma_addr_t size) 83 { 84 uint32_t addr; 85 uint64_t wmask; 86 uint16_t sriov_cap = dev->exp.sriov_cap; 87 88 assert(sriov_cap > 0); 89 assert(region_num >= 0); 90 assert(region_num < PCI_NUM_REGIONS); 91 assert(region_num != PCI_ROM_SLOT); 92 93 wmask = ~(size - 1); 94 addr = sriov_cap + PCI_SRIOV_BAR + region_num * 4; 95 96 pci_set_long(dev->config + addr, type); 97 if (!(type & PCI_BASE_ADDRESS_SPACE_IO) && 98 type & PCI_BASE_ADDRESS_MEM_TYPE_64) { 99 pci_set_quad(dev->wmask + addr, wmask); 100 pci_set_quad(dev->cmask + addr, ~0ULL); 101 } else { 102 pci_set_long(dev->wmask + addr, wmask & 0xffffffff); 103 pci_set_long(dev->cmask + addr, 0xffffffff); 104 } 105 dev->exp.sriov_pf.vf_bar_type[region_num] = type; 106 } 107 108 void pcie_sriov_vf_register_bar(PCIDevice *dev, int region_num, 109 MemoryRegion *memory) 110 { 111 PCIIORegion *r; 112 PCIBus *bus = pci_get_bus(dev); 113 uint8_t type; 114 pcibus_t size = memory_region_size(memory); 115 116 assert(pci_is_vf(dev)); /* PFs must use pci_register_bar */ 117 assert(region_num >= 0); 118 assert(region_num < PCI_NUM_REGIONS); 119 type = dev->exp.sriov_vf.pf->exp.sriov_pf.vf_bar_type[region_num]; 120 121 if (!is_power_of_2(size)) { 122 error_report("%s: PCI region size must be a power" 123 " of two - type=0x%x, size=0x%"FMT_PCIBUS, 124 __func__, type, size); 125 exit(1); 126 } 127 128 r = &dev->io_regions[region_num]; 129 r->memory = memory; 130 r->address_space = 131 type & PCI_BASE_ADDRESS_SPACE_IO 132 ? bus->address_space_io 133 : bus->address_space_mem; 134 r->size = size; 135 r->type = type; 136 137 r->addr = pci_bar_address(dev, region_num, r->type, r->size); 138 if (r->addr != PCI_BAR_UNMAPPED) { 139 memory_region_add_subregion_overlap(r->address_space, 140 r->addr, r->memory, 1); 141 } 142 } 143 144 static PCIDevice *register_vf(PCIDevice *pf, int devfn, const char *name, 145 uint16_t vf_num) 146 { 147 PCIDevice *dev = pci_new(devfn, name); 148 dev->exp.sriov_vf.pf = pf; 149 dev->exp.sriov_vf.vf_number = vf_num; 150 PCIBus *bus = pci_get_bus(pf); 151 Error *local_err = NULL; 152 153 qdev_realize(&dev->qdev, &bus->qbus, &local_err); 154 if (local_err) { 155 error_report_err(local_err); 156 return NULL; 157 } 158 159 /* set vid/did according to sr/iov spec - they are not used */ 160 pci_config_set_vendor_id(dev->config, 0xffff); 161 pci_config_set_device_id(dev->config, 0xffff); 162 163 return dev; 164 } 165 166 static void register_vfs(PCIDevice *dev) 167 { 168 uint16_t num_vfs; 169 uint16_t i; 170 uint16_t sriov_cap = dev->exp.sriov_cap; 171 uint16_t vf_offset = 172 pci_get_word(dev->config + sriov_cap + PCI_SRIOV_VF_OFFSET); 173 uint16_t vf_stride = 174 pci_get_word(dev->config + sriov_cap + PCI_SRIOV_VF_STRIDE); 175 int32_t devfn = dev->devfn + vf_offset; 176 177 assert(sriov_cap > 0); 178 num_vfs = pci_get_word(dev->config + sriov_cap + PCI_SRIOV_NUM_VF); 179 180 dev->exp.sriov_pf.vf = g_new(PCIDevice *, num_vfs); 181 assert(dev->exp.sriov_pf.vf); 182 183 trace_sriov_register_vfs(dev->name, PCI_SLOT(dev->devfn), 184 PCI_FUNC(dev->devfn), num_vfs); 185 for (i = 0; i < num_vfs; i++) { 186 dev->exp.sriov_pf.vf[i] = register_vf(dev, devfn, 187 dev->exp.sriov_pf.vfname, i); 188 if (!dev->exp.sriov_pf.vf[i]) { 189 num_vfs = i; 190 break; 191 } 192 devfn += vf_stride; 193 } 194 dev->exp.sriov_pf.num_vfs = num_vfs; 195 } 196 197 static void unregister_vfs(PCIDevice *dev) 198 { 199 Error *local_err = NULL; 200 uint16_t num_vfs = dev->exp.sriov_pf.num_vfs; 201 uint16_t i; 202 203 trace_sriov_unregister_vfs(dev->name, PCI_SLOT(dev->devfn), 204 PCI_FUNC(dev->devfn), num_vfs); 205 for (i = 0; i < num_vfs; i++) { 206 PCIDevice *vf = dev->exp.sriov_pf.vf[i]; 207 object_property_set_bool(OBJECT(vf), "realized", false, &local_err); 208 if (local_err) { 209 fprintf(stderr, "Failed to unplug: %s\n", 210 error_get_pretty(local_err)); 211 error_free(local_err); 212 } 213 object_unparent(OBJECT(vf)); 214 } 215 g_free(dev->exp.sriov_pf.vf); 216 dev->exp.sriov_pf.vf = NULL; 217 dev->exp.sriov_pf.num_vfs = 0; 218 pci_set_word(dev->config + dev->exp.sriov_cap + PCI_SRIOV_NUM_VF, 0); 219 } 220 221 void pcie_sriov_config_write(PCIDevice *dev, uint32_t address, 222 uint32_t val, int len) 223 { 224 uint32_t off; 225 uint16_t sriov_cap = dev->exp.sriov_cap; 226 227 if (!sriov_cap || address < sriov_cap) { 228 return; 229 } 230 off = address - sriov_cap; 231 if (off >= PCI_EXT_CAP_SRIOV_SIZEOF) { 232 return; 233 } 234 235 trace_sriov_config_write(dev->name, PCI_SLOT(dev->devfn), 236 PCI_FUNC(dev->devfn), off, val, len); 237 238 if (range_covers_byte(off, len, PCI_SRIOV_CTRL)) { 239 if (dev->exp.sriov_pf.num_vfs) { 240 if (!(val & PCI_SRIOV_CTRL_VFE)) { 241 unregister_vfs(dev); 242 } 243 } else { 244 if (val & PCI_SRIOV_CTRL_VFE) { 245 register_vfs(dev); 246 } 247 } 248 } 249 } 250 251 252 /* Reset SR/IOV VF Enable bit to trigger an unregister of all VFs */ 253 void pcie_sriov_pf_disable_vfs(PCIDevice *dev) 254 { 255 uint16_t sriov_cap = dev->exp.sriov_cap; 256 if (sriov_cap) { 257 uint32_t val = pci_get_byte(dev->config + sriov_cap + PCI_SRIOV_CTRL); 258 if (val & PCI_SRIOV_CTRL_VFE) { 259 val &= ~PCI_SRIOV_CTRL_VFE; 260 pcie_sriov_config_write(dev, sriov_cap + PCI_SRIOV_CTRL, val, 1); 261 } 262 } 263 } 264 265 /* Add optional supported page sizes to the mask of supported page sizes */ 266 void pcie_sriov_pf_add_sup_pgsize(PCIDevice *dev, uint16_t opt_sup_pgsize) 267 { 268 uint8_t *cfg = dev->config + dev->exp.sriov_cap; 269 uint8_t *wmask = dev->wmask + dev->exp.sriov_cap; 270 271 uint16_t sup_pgsize = pci_get_word(cfg + PCI_SRIOV_SUP_PGSIZE); 272 273 sup_pgsize |= opt_sup_pgsize; 274 275 /* 276 * Make sure the new bits are set, and that system page size 277 * also can be set to any of the new values according to spec: 278 */ 279 pci_set_word(cfg + PCI_SRIOV_SUP_PGSIZE, sup_pgsize); 280 pci_set_word(wmask + PCI_SRIOV_SYS_PGSIZE, sup_pgsize); 281 } 282 283 284 uint16_t pcie_sriov_vf_number(PCIDevice *dev) 285 { 286 assert(pci_is_vf(dev)); 287 return dev->exp.sriov_vf.vf_number; 288 } 289 290 PCIDevice *pcie_sriov_get_pf(PCIDevice *dev) 291 { 292 return dev->exp.sriov_vf.pf; 293 } 294 295 PCIDevice *pcie_sriov_get_vf_at_index(PCIDevice *dev, int n) 296 { 297 assert(!pci_is_vf(dev)); 298 if (n < dev->exp.sriov_pf.num_vfs) { 299 return dev->exp.sriov_pf.vf[n]; 300 } 301 return NULL; 302 }