1 /* 2 * QEMU PCI test device 3 * 4 * Copyright (c) 2012 Red Hat Inc. 5 * Author: Michael S. Tsirkin <mst@redhat.com> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License along 18 * with this program; if not, see <http://www.gnu.org/licenses/>. 19 */ 20 21 #include "qemu/osdep.h" 22 #include "hw/pci/pci.h" 23 #include "hw/qdev-properties.h" 24 #include "qemu/event_notifier.h" 25 #include "qemu/module.h" 26 #include "sysemu/kvm.h" 27 28 typedef struct PCITestDevHdr { 29 uint8_t test; 30 uint8_t width; 31 uint8_t pad0[2]; 32 uint32_t offset; 33 uint8_t data; 34 uint8_t pad1[3]; 35 uint32_t count; 36 uint8_t name[]; 37 } PCITestDevHdr; 38 39 typedef struct IOTest { 40 MemoryRegion *mr; 41 EventNotifier notifier; 42 bool hasnotifier; 43 unsigned size; 44 bool match_data; 45 PCITestDevHdr *hdr; 46 unsigned bufsize; 47 } IOTest; 48 49 #define IOTEST_DATAMATCH 0xFA 50 #define IOTEST_NOMATCH 0xCE 51 52 #define IOTEST_IOSIZE 128 53 #define IOTEST_MEMSIZE 2048 54 55 static const char *iotest_test[] = { 56 "no-eventfd", 57 "wildcard-eventfd", 58 "datamatch-eventfd" 59 }; 60 61 static const char *iotest_type[] = { 62 "mmio", 63 "portio" 64 }; 65 66 #define IOTEST_TEST(i) (iotest_test[((i) % ARRAY_SIZE(iotest_test))]) 67 #define IOTEST_TYPE(i) (iotest_type[((i) / ARRAY_SIZE(iotest_test))]) 68 #define IOTEST_MAX_TEST (ARRAY_SIZE(iotest_test)) 69 #define IOTEST_MAX_TYPE (ARRAY_SIZE(iotest_type)) 70 #define IOTEST_MAX (IOTEST_MAX_TEST * IOTEST_MAX_TYPE) 71 72 enum { 73 IOTEST_ACCESS_NAME, 74 IOTEST_ACCESS_DATA, 75 IOTEST_ACCESS_MAX, 76 }; 77 78 #define IOTEST_ACCESS_TYPE uint8_t 79 #define IOTEST_ACCESS_WIDTH (sizeof(uint8_t)) 80 81 typedef struct PCITestDevState { 82 /*< private >*/ 83 PCIDevice parent_obj; 84 /*< public >*/ 85 86 MemoryRegion mmio; 87 MemoryRegion portio; 88 IOTest *tests; 89 int current; 90 91 uint64_t membar_size; 92 MemoryRegion membar; 93 } PCITestDevState; 94 95 #define TYPE_PCI_TEST_DEV "pci-testdev" 96 97 #define PCI_TEST_DEV(obj) \ 98 OBJECT_CHECK(PCITestDevState, (obj), TYPE_PCI_TEST_DEV) 99 100 #define IOTEST_IS_MEM(i) (strcmp(IOTEST_TYPE(i), "portio")) 101 #define IOTEST_REGION(d, i) (IOTEST_IS_MEM(i) ? &(d)->mmio : &(d)->portio) 102 #define IOTEST_SIZE(i) (IOTEST_IS_MEM(i) ? IOTEST_MEMSIZE : IOTEST_IOSIZE) 103 #define IOTEST_PCI_BAR(i) (IOTEST_IS_MEM(i) ? PCI_BASE_ADDRESS_SPACE_MEMORY : \ 104 PCI_BASE_ADDRESS_SPACE_IO) 105 106 static int pci_testdev_start(IOTest *test) 107 { 108 test->hdr->count = 0; 109 if (!test->hasnotifier) { 110 return 0; 111 } 112 event_notifier_test_and_clear(&test->notifier); 113 memory_region_add_eventfd(test->mr, 114 le32_to_cpu(test->hdr->offset), 115 test->size, 116 test->match_data, 117 test->hdr->data, 118 &test->notifier); 119 return 0; 120 } 121 122 static void pci_testdev_stop(IOTest *test) 123 { 124 if (!test->hasnotifier) { 125 return; 126 } 127 memory_region_del_eventfd(test->mr, 128 le32_to_cpu(test->hdr->offset), 129 test->size, 130 test->match_data, 131 test->hdr->data, 132 &test->notifier); 133 } 134 135 static void 136 pci_testdev_reset(PCITestDevState *d) 137 { 138 if (d->current == -1) { 139 return; 140 } 141 pci_testdev_stop(&d->tests[d->current]); 142 d->current = -1; 143 } 144 145 static void pci_testdev_inc(IOTest *test, unsigned inc) 146 { 147 uint32_t c = le32_to_cpu(test->hdr->count); 148 test->hdr->count = cpu_to_le32(c + inc); 149 } 150 151 static void 152 pci_testdev_write(void *opaque, hwaddr addr, uint64_t val, 153 unsigned size, int type) 154 { 155 PCITestDevState *d = opaque; 156 IOTest *test; 157 int t, r; 158 159 if (addr == offsetof(PCITestDevHdr, test)) { 160 pci_testdev_reset(d); 161 if (val >= IOTEST_MAX_TEST) { 162 return; 163 } 164 t = type * IOTEST_MAX_TEST + val; 165 r = pci_testdev_start(&d->tests[t]); 166 if (r < 0) { 167 return; 168 } 169 d->current = t; 170 return; 171 } 172 if (d->current < 0) { 173 return; 174 } 175 test = &d->tests[d->current]; 176 if (addr != le32_to_cpu(test->hdr->offset)) { 177 return; 178 } 179 if (test->match_data && test->size != size) { 180 return; 181 } 182 if (test->match_data && val != test->hdr->data) { 183 return; 184 } 185 pci_testdev_inc(test, 1); 186 } 187 188 static uint64_t 189 pci_testdev_read(void *opaque, hwaddr addr, unsigned size) 190 { 191 PCITestDevState *d = opaque; 192 const char *buf; 193 IOTest *test; 194 if (d->current < 0) { 195 return 0; 196 } 197 test = &d->tests[d->current]; 198 buf = (const char *)test->hdr; 199 if (addr + size >= test->bufsize) { 200 return 0; 201 } 202 if (test->hasnotifier) { 203 event_notifier_test_and_clear(&test->notifier); 204 } 205 return buf[addr]; 206 } 207 208 static void 209 pci_testdev_mmio_write(void *opaque, hwaddr addr, uint64_t val, 210 unsigned size) 211 { 212 pci_testdev_write(opaque, addr, val, size, 0); 213 } 214 215 static void 216 pci_testdev_pio_write(void *opaque, hwaddr addr, uint64_t val, 217 unsigned size) 218 { 219 pci_testdev_write(opaque, addr, val, size, 1); 220 } 221 222 static const MemoryRegionOps pci_testdev_mmio_ops = { 223 .read = pci_testdev_read, 224 .write = pci_testdev_mmio_write, 225 .endianness = DEVICE_LITTLE_ENDIAN, 226 .impl = { 227 .min_access_size = 1, 228 .max_access_size = 1, 229 }, 230 }; 231 232 static const MemoryRegionOps pci_testdev_pio_ops = { 233 .read = pci_testdev_read, 234 .write = pci_testdev_pio_write, 235 .endianness = DEVICE_LITTLE_ENDIAN, 236 .impl = { 237 .min_access_size = 1, 238 .max_access_size = 1, 239 }, 240 }; 241 242 static void pci_testdev_realize(PCIDevice *pci_dev, Error **errp) 243 { 244 PCITestDevState *d = PCI_TEST_DEV(pci_dev); 245 uint8_t *pci_conf; 246 char *name; 247 int r, i; 248 bool fastmmio = kvm_ioeventfd_any_length_enabled(); 249 250 pci_conf = pci_dev->config; 251 252 pci_conf[PCI_INTERRUPT_PIN] = 0; /* no interrupt pin */ 253 254 memory_region_init_io(&d->mmio, OBJECT(d), &pci_testdev_mmio_ops, d, 255 "pci-testdev-mmio", IOTEST_MEMSIZE * 2); 256 memory_region_init_io(&d->portio, OBJECT(d), &pci_testdev_pio_ops, d, 257 "pci-testdev-portio", IOTEST_IOSIZE * 2); 258 pci_register_bar(pci_dev, 0, PCI_BASE_ADDRESS_SPACE_MEMORY, &d->mmio); 259 pci_register_bar(pci_dev, 1, PCI_BASE_ADDRESS_SPACE_IO, &d->portio); 260 261 if (d->membar_size) { 262 memory_region_init(&d->membar, OBJECT(d), "pci-testdev-membar", 263 d->membar_size); 264 pci_register_bar(pci_dev, 2, 265 PCI_BASE_ADDRESS_SPACE_MEMORY | 266 PCI_BASE_ADDRESS_MEM_PREFETCH | 267 PCI_BASE_ADDRESS_MEM_TYPE_64, 268 &d->membar); 269 } 270 271 d->current = -1; 272 d->tests = g_malloc0(IOTEST_MAX * sizeof *d->tests); 273 for (i = 0; i < IOTEST_MAX; ++i) { 274 IOTest *test = &d->tests[i]; 275 name = g_strdup_printf("%s-%s", IOTEST_TYPE(i), IOTEST_TEST(i)); 276 test->bufsize = sizeof(PCITestDevHdr) + strlen(name) + 1; 277 test->hdr = g_malloc0(test->bufsize); 278 memcpy(test->hdr->name, name, strlen(name) + 1); 279 g_free(name); 280 test->hdr->offset = cpu_to_le32(IOTEST_SIZE(i) + i * IOTEST_ACCESS_WIDTH); 281 test->match_data = strcmp(IOTEST_TEST(i), "wildcard-eventfd"); 282 if (fastmmio && IOTEST_IS_MEM(i) && !test->match_data) { 283 test->size = 0; 284 } else { 285 test->size = IOTEST_ACCESS_WIDTH; 286 } 287 test->hdr->test = i; 288 test->hdr->data = test->match_data ? IOTEST_DATAMATCH : IOTEST_NOMATCH; 289 test->hdr->width = IOTEST_ACCESS_WIDTH; 290 test->mr = IOTEST_REGION(d, i); 291 if (!strcmp(IOTEST_TEST(i), "no-eventfd")) { 292 test->hasnotifier = false; 293 continue; 294 } 295 r = event_notifier_init(&test->notifier, 0); 296 assert(r >= 0); 297 test->hasnotifier = true; 298 } 299 } 300 301 static void 302 pci_testdev_uninit(PCIDevice *dev) 303 { 304 PCITestDevState *d = PCI_TEST_DEV(dev); 305 int i; 306 307 pci_testdev_reset(d); 308 for (i = 0; i < IOTEST_MAX; ++i) { 309 if (d->tests[i].hasnotifier) { 310 event_notifier_cleanup(&d->tests[i].notifier); 311 } 312 g_free(d->tests[i].hdr); 313 } 314 g_free(d->tests); 315 } 316 317 static void qdev_pci_testdev_reset(DeviceState *dev) 318 { 319 PCITestDevState *d = PCI_TEST_DEV(dev); 320 pci_testdev_reset(d); 321 } 322 323 static Property pci_testdev_properties[] = { 324 DEFINE_PROP_SIZE("membar", PCITestDevState, membar_size, 0), 325 DEFINE_PROP_END_OF_LIST(), 326 }; 327 328 static void pci_testdev_class_init(ObjectClass *klass, void *data) 329 { 330 DeviceClass *dc = DEVICE_CLASS(klass); 331 PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); 332 333 k->realize = pci_testdev_realize; 334 k->exit = pci_testdev_uninit; 335 k->vendor_id = PCI_VENDOR_ID_REDHAT; 336 k->device_id = PCI_DEVICE_ID_REDHAT_TEST; 337 k->revision = 0x00; 338 k->class_id = PCI_CLASS_OTHERS; 339 dc->desc = "PCI Test Device"; 340 set_bit(DEVICE_CATEGORY_MISC, dc->categories); 341 dc->reset = qdev_pci_testdev_reset; 342 device_class_set_props(dc, pci_testdev_properties); 343 } 344 345 static const TypeInfo pci_testdev_info = { 346 .name = TYPE_PCI_TEST_DEV, 347 .parent = TYPE_PCI_DEVICE, 348 .instance_size = sizeof(PCITestDevState), 349 .class_init = pci_testdev_class_init, 350 .interfaces = (InterfaceInfo[]) { 351 { INTERFACE_CONVENTIONAL_PCI_DEVICE }, 352 { }, 353 }, 354 }; 355 356 static void pci_testdev_register_types(void) 357 { 358 type_register_static(&pci_testdev_info); 359 } 360 361 type_init(pci_testdev_register_types) 362