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 "qemu/event_notifier.h" 24 #include "qemu/module.h" 25 #include "sysemu/kvm.h" 26 27 typedef struct PCITestDevHdr { 28 uint8_t test; 29 uint8_t width; 30 uint8_t pad0[2]; 31 uint32_t offset; 32 uint8_t data; 33 uint8_t pad1[3]; 34 uint32_t count; 35 uint8_t name[]; 36 } PCITestDevHdr; 37 38 typedef struct IOTest { 39 MemoryRegion *mr; 40 EventNotifier notifier; 41 bool hasnotifier; 42 unsigned size; 43 bool match_data; 44 PCITestDevHdr *hdr; 45 unsigned bufsize; 46 } IOTest; 47 48 #define IOTEST_DATAMATCH 0xFA 49 #define IOTEST_NOMATCH 0xCE 50 51 #define IOTEST_IOSIZE 128 52 #define IOTEST_MEMSIZE 2048 53 54 static const char *iotest_test[] = { 55 "no-eventfd", 56 "wildcard-eventfd", 57 "datamatch-eventfd" 58 }; 59 60 static const char *iotest_type[] = { 61 "mmio", 62 "portio" 63 }; 64 65 #define IOTEST_TEST(i) (iotest_test[((i) % ARRAY_SIZE(iotest_test))]) 66 #define IOTEST_TYPE(i) (iotest_type[((i) / ARRAY_SIZE(iotest_test))]) 67 #define IOTEST_MAX_TEST (ARRAY_SIZE(iotest_test)) 68 #define IOTEST_MAX_TYPE (ARRAY_SIZE(iotest_type)) 69 #define IOTEST_MAX (IOTEST_MAX_TEST * IOTEST_MAX_TYPE) 70 71 enum { 72 IOTEST_ACCESS_NAME, 73 IOTEST_ACCESS_DATA, 74 IOTEST_ACCESS_MAX, 75 }; 76 77 #define IOTEST_ACCESS_TYPE uint8_t 78 #define IOTEST_ACCESS_WIDTH (sizeof(uint8_t)) 79 80 typedef struct PCITestDevState { 81 /*< private >*/ 82 PCIDevice parent_obj; 83 /*< public >*/ 84 85 MemoryRegion mmio; 86 MemoryRegion portio; 87 IOTest *tests; 88 int current; 89 90 uint64_t membar_size; 91 MemoryRegion membar; 92 } PCITestDevState; 93 94 #define TYPE_PCI_TEST_DEV "pci-testdev" 95 96 #define PCI_TEST_DEV(obj) \ 97 OBJECT_CHECK(PCITestDevState, (obj), TYPE_PCI_TEST_DEV) 98 99 #define IOTEST_IS_MEM(i) (strcmp(IOTEST_TYPE(i), "portio")) 100 #define IOTEST_REGION(d, i) (IOTEST_IS_MEM(i) ? &(d)->mmio : &(d)->portio) 101 #define IOTEST_SIZE(i) (IOTEST_IS_MEM(i) ? IOTEST_MEMSIZE : IOTEST_IOSIZE) 102 #define IOTEST_PCI_BAR(i) (IOTEST_IS_MEM(i) ? PCI_BASE_ADDRESS_SPACE_MEMORY : \ 103 PCI_BASE_ADDRESS_SPACE_IO) 104 105 static int pci_testdev_start(IOTest *test) 106 { 107 test->hdr->count = 0; 108 if (!test->hasnotifier) { 109 return 0; 110 } 111 event_notifier_test_and_clear(&test->notifier); 112 memory_region_add_eventfd(test->mr, 113 le32_to_cpu(test->hdr->offset), 114 test->size, 115 test->match_data, 116 test->hdr->data, 117 &test->notifier); 118 return 0; 119 } 120 121 static void pci_testdev_stop(IOTest *test) 122 { 123 if (!test->hasnotifier) { 124 return; 125 } 126 memory_region_del_eventfd(test->mr, 127 le32_to_cpu(test->hdr->offset), 128 test->size, 129 test->match_data, 130 test->hdr->data, 131 &test->notifier); 132 } 133 134 static void 135 pci_testdev_reset(PCITestDevState *d) 136 { 137 if (d->current == -1) { 138 return; 139 } 140 pci_testdev_stop(&d->tests[d->current]); 141 d->current = -1; 142 } 143 144 static void pci_testdev_inc(IOTest *test, unsigned inc) 145 { 146 uint32_t c = le32_to_cpu(test->hdr->count); 147 test->hdr->count = cpu_to_le32(c + inc); 148 } 149 150 static void 151 pci_testdev_write(void *opaque, hwaddr addr, uint64_t val, 152 unsigned size, int type) 153 { 154 PCITestDevState *d = opaque; 155 IOTest *test; 156 int t, r; 157 158 if (addr == offsetof(PCITestDevHdr, test)) { 159 pci_testdev_reset(d); 160 if (val >= IOTEST_MAX_TEST) { 161 return; 162 } 163 t = type * IOTEST_MAX_TEST + val; 164 r = pci_testdev_start(&d->tests[t]); 165 if (r < 0) { 166 return; 167 } 168 d->current = t; 169 return; 170 } 171 if (d->current < 0) { 172 return; 173 } 174 test = &d->tests[d->current]; 175 if (addr != le32_to_cpu(test->hdr->offset)) { 176 return; 177 } 178 if (test->match_data && test->size != size) { 179 return; 180 } 181 if (test->match_data && val != test->hdr->data) { 182 return; 183 } 184 pci_testdev_inc(test, 1); 185 } 186 187 static uint64_t 188 pci_testdev_read(void *opaque, hwaddr addr, unsigned size) 189 { 190 PCITestDevState *d = opaque; 191 const char *buf; 192 IOTest *test; 193 if (d->current < 0) { 194 return 0; 195 } 196 test = &d->tests[d->current]; 197 buf = (const char *)test->hdr; 198 if (addr + size >= test->bufsize) { 199 return 0; 200 } 201 if (test->hasnotifier) { 202 event_notifier_test_and_clear(&test->notifier); 203 } 204 return buf[addr]; 205 } 206 207 static void 208 pci_testdev_mmio_write(void *opaque, hwaddr addr, uint64_t val, 209 unsigned size) 210 { 211 pci_testdev_write(opaque, addr, val, size, 0); 212 } 213 214 static void 215 pci_testdev_pio_write(void *opaque, hwaddr addr, uint64_t val, 216 unsigned size) 217 { 218 pci_testdev_write(opaque, addr, val, size, 1); 219 } 220 221 static const MemoryRegionOps pci_testdev_mmio_ops = { 222 .read = pci_testdev_read, 223 .write = pci_testdev_mmio_write, 224 .endianness = DEVICE_LITTLE_ENDIAN, 225 .impl = { 226 .min_access_size = 1, 227 .max_access_size = 1, 228 }, 229 }; 230 231 static const MemoryRegionOps pci_testdev_pio_ops = { 232 .read = pci_testdev_read, 233 .write = pci_testdev_pio_write, 234 .endianness = DEVICE_LITTLE_ENDIAN, 235 .impl = { 236 .min_access_size = 1, 237 .max_access_size = 1, 238 }, 239 }; 240 241 static void pci_testdev_realize(PCIDevice *pci_dev, Error **errp) 242 { 243 PCITestDevState *d = PCI_TEST_DEV(pci_dev); 244 uint8_t *pci_conf; 245 char *name; 246 int r, i; 247 bool fastmmio = kvm_ioeventfd_any_length_enabled(); 248 249 pci_conf = pci_dev->config; 250 251 pci_conf[PCI_INTERRUPT_PIN] = 0; /* no interrupt pin */ 252 253 memory_region_init_io(&d->mmio, OBJECT(d), &pci_testdev_mmio_ops, d, 254 "pci-testdev-mmio", IOTEST_MEMSIZE * 2); 255 memory_region_init_io(&d->portio, OBJECT(d), &pci_testdev_pio_ops, d, 256 "pci-testdev-portio", IOTEST_IOSIZE * 2); 257 pci_register_bar(pci_dev, 0, PCI_BASE_ADDRESS_SPACE_MEMORY, &d->mmio); 258 pci_register_bar(pci_dev, 1, PCI_BASE_ADDRESS_SPACE_IO, &d->portio); 259 260 if (d->membar_size) { 261 memory_region_init(&d->membar, OBJECT(d), "pci-testdev-membar", 262 d->membar_size); 263 pci_register_bar(pci_dev, 2, 264 PCI_BASE_ADDRESS_SPACE_MEMORY | 265 PCI_BASE_ADDRESS_MEM_PREFETCH | 266 PCI_BASE_ADDRESS_MEM_TYPE_64, 267 &d->membar); 268 } 269 270 d->current = -1; 271 d->tests = g_malloc0(IOTEST_MAX * sizeof *d->tests); 272 for (i = 0; i < IOTEST_MAX; ++i) { 273 IOTest *test = &d->tests[i]; 274 name = g_strdup_printf("%s-%s", IOTEST_TYPE(i), IOTEST_TEST(i)); 275 test->bufsize = sizeof(PCITestDevHdr) + strlen(name) + 1; 276 test->hdr = g_malloc0(test->bufsize); 277 memcpy(test->hdr->name, name, strlen(name) + 1); 278 g_free(name); 279 test->hdr->offset = cpu_to_le32(IOTEST_SIZE(i) + i * IOTEST_ACCESS_WIDTH); 280 test->match_data = strcmp(IOTEST_TEST(i), "wildcard-eventfd"); 281 if (fastmmio && IOTEST_IS_MEM(i) && !test->match_data) { 282 test->size = 0; 283 } else { 284 test->size = IOTEST_ACCESS_WIDTH; 285 } 286 test->hdr->test = i; 287 test->hdr->data = test->match_data ? IOTEST_DATAMATCH : IOTEST_NOMATCH; 288 test->hdr->width = IOTEST_ACCESS_WIDTH; 289 test->mr = IOTEST_REGION(d, i); 290 if (!strcmp(IOTEST_TEST(i), "no-eventfd")) { 291 test->hasnotifier = false; 292 continue; 293 } 294 r = event_notifier_init(&test->notifier, 0); 295 assert(r >= 0); 296 test->hasnotifier = true; 297 } 298 } 299 300 static void 301 pci_testdev_uninit(PCIDevice *dev) 302 { 303 PCITestDevState *d = PCI_TEST_DEV(dev); 304 int i; 305 306 pci_testdev_reset(d); 307 for (i = 0; i < IOTEST_MAX; ++i) { 308 if (d->tests[i].hasnotifier) { 309 event_notifier_cleanup(&d->tests[i].notifier); 310 } 311 g_free(d->tests[i].hdr); 312 } 313 g_free(d->tests); 314 } 315 316 static void qdev_pci_testdev_reset(DeviceState *dev) 317 { 318 PCITestDevState *d = PCI_TEST_DEV(dev); 319 pci_testdev_reset(d); 320 } 321 322 static Property pci_testdev_properties[] = { 323 DEFINE_PROP_SIZE("membar", PCITestDevState, membar_size, 0), 324 DEFINE_PROP_END_OF_LIST(), 325 }; 326 327 static void pci_testdev_class_init(ObjectClass *klass, void *data) 328 { 329 DeviceClass *dc = DEVICE_CLASS(klass); 330 PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); 331 332 k->realize = pci_testdev_realize; 333 k->exit = pci_testdev_uninit; 334 k->vendor_id = PCI_VENDOR_ID_REDHAT; 335 k->device_id = PCI_DEVICE_ID_REDHAT_TEST; 336 k->revision = 0x00; 337 k->class_id = PCI_CLASS_OTHERS; 338 dc->desc = "PCI Test Device"; 339 set_bit(DEVICE_CATEGORY_MISC, dc->categories); 340 dc->reset = qdev_pci_testdev_reset; 341 dc->props = pci_testdev_properties; 342 } 343 344 static const TypeInfo pci_testdev_info = { 345 .name = TYPE_PCI_TEST_DEV, 346 .parent = TYPE_PCI_DEVICE, 347 .instance_size = sizeof(PCITestDevState), 348 .class_init = pci_testdev_class_init, 349 .interfaces = (InterfaceInfo[]) { 350 { INTERFACE_CONVENTIONAL_PCI_DEVICE }, 351 { }, 352 }, 353 }; 354 355 static void pci_testdev_register_types(void) 356 { 357 type_register_static(&pci_testdev_info); 358 } 359 360 type_init(pci_testdev_register_types) 361