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 #include "qemu/osdep.h" 21 #include "hw/hw.h" 22 #include "hw/pci/pci.h" 23 #include "qemu/event_notifier.h" 24 #include "sysemu/kvm.h" 25 26 typedef struct PCITestDevHdr { 27 uint8_t test; 28 uint8_t width; 29 uint8_t pad0[2]; 30 uint32_t offset; 31 uint8_t data; 32 uint8_t pad1[3]; 33 uint32_t count; 34 uint8_t name[]; 35 } PCITestDevHdr; 36 37 typedef struct IOTest { 38 MemoryRegion *mr; 39 EventNotifier notifier; 40 bool hasnotifier; 41 unsigned size; 42 bool match_data; 43 PCITestDevHdr *hdr; 44 unsigned bufsize; 45 } IOTest; 46 47 #define IOTEST_DATAMATCH 0xFA 48 #define IOTEST_NOMATCH 0xCE 49 50 #define IOTEST_IOSIZE 128 51 #define IOTEST_MEMSIZE 2048 52 53 static const char *iotest_test[] = { 54 "no-eventfd", 55 "wildcard-eventfd", 56 "datamatch-eventfd" 57 }; 58 59 static const char *iotest_type[] = { 60 "mmio", 61 "portio" 62 }; 63 64 #define IOTEST_TEST(i) (iotest_test[((i) % ARRAY_SIZE(iotest_test))]) 65 #define IOTEST_TYPE(i) (iotest_type[((i) / ARRAY_SIZE(iotest_test))]) 66 #define IOTEST_MAX_TEST (ARRAY_SIZE(iotest_test)) 67 #define IOTEST_MAX_TYPE (ARRAY_SIZE(iotest_type)) 68 #define IOTEST_MAX (IOTEST_MAX_TEST * IOTEST_MAX_TYPE) 69 70 enum { 71 IOTEST_ACCESS_NAME, 72 IOTEST_ACCESS_DATA, 73 IOTEST_ACCESS_MAX, 74 }; 75 76 #define IOTEST_ACCESS_TYPE uint8_t 77 #define IOTEST_ACCESS_WIDTH (sizeof(uint8_t)) 78 79 typedef struct PCITestDevState { 80 /*< private >*/ 81 PCIDevice parent_obj; 82 /*< public >*/ 83 84 MemoryRegion mmio; 85 MemoryRegion portio; 86 IOTest *tests; 87 int current; 88 } PCITestDevState; 89 90 #define TYPE_PCI_TEST_DEV "pci-testdev" 91 92 #define PCI_TEST_DEV(obj) \ 93 OBJECT_CHECK(PCITestDevState, (obj), TYPE_PCI_TEST_DEV) 94 95 #define IOTEST_IS_MEM(i) (strcmp(IOTEST_TYPE(i), "portio")) 96 #define IOTEST_REGION(d, i) (IOTEST_IS_MEM(i) ? &(d)->mmio : &(d)->portio) 97 #define IOTEST_SIZE(i) (IOTEST_IS_MEM(i) ? IOTEST_MEMSIZE : IOTEST_IOSIZE) 98 #define IOTEST_PCI_BAR(i) (IOTEST_IS_MEM(i) ? PCI_BASE_ADDRESS_SPACE_MEMORY : \ 99 PCI_BASE_ADDRESS_SPACE_IO) 100 101 static int pci_testdev_start(IOTest *test) 102 { 103 test->hdr->count = 0; 104 if (!test->hasnotifier) { 105 return 0; 106 } 107 event_notifier_test_and_clear(&test->notifier); 108 memory_region_add_eventfd(test->mr, 109 le32_to_cpu(test->hdr->offset), 110 test->size, 111 test->match_data, 112 test->hdr->data, 113 &test->notifier); 114 return 0; 115 } 116 117 static void pci_testdev_stop(IOTest *test) 118 { 119 if (!test->hasnotifier) { 120 return; 121 } 122 memory_region_del_eventfd(test->mr, 123 le32_to_cpu(test->hdr->offset), 124 test->size, 125 test->match_data, 126 test->hdr->data, 127 &test->notifier); 128 } 129 130 static void 131 pci_testdev_reset(PCITestDevState *d) 132 { 133 if (d->current == -1) { 134 return; 135 } 136 pci_testdev_stop(&d->tests[d->current]); 137 d->current = -1; 138 } 139 140 static void pci_testdev_inc(IOTest *test, unsigned inc) 141 { 142 uint32_t c = le32_to_cpu(test->hdr->count); 143 test->hdr->count = cpu_to_le32(c + inc); 144 } 145 146 static void 147 pci_testdev_write(void *opaque, hwaddr addr, uint64_t val, 148 unsigned size, int type) 149 { 150 PCITestDevState *d = opaque; 151 IOTest *test; 152 int t, r; 153 154 if (addr == offsetof(PCITestDevHdr, test)) { 155 pci_testdev_reset(d); 156 if (val >= IOTEST_MAX_TEST) { 157 return; 158 } 159 t = type * IOTEST_MAX_TEST + val; 160 r = pci_testdev_start(&d->tests[t]); 161 if (r < 0) { 162 return; 163 } 164 d->current = t; 165 return; 166 } 167 if (d->current < 0) { 168 return; 169 } 170 test = &d->tests[d->current]; 171 if (addr != le32_to_cpu(test->hdr->offset)) { 172 return; 173 } 174 if (test->match_data && test->size != size) { 175 return; 176 } 177 if (test->match_data && val != test->hdr->data) { 178 return; 179 } 180 pci_testdev_inc(test, 1); 181 } 182 183 static uint64_t 184 pci_testdev_read(void *opaque, hwaddr addr, unsigned size) 185 { 186 PCITestDevState *d = opaque; 187 const char *buf; 188 IOTest *test; 189 if (d->current < 0) { 190 return 0; 191 } 192 test = &d->tests[d->current]; 193 buf = (const char *)test->hdr; 194 if (addr + size >= test->bufsize) { 195 return 0; 196 } 197 if (test->hasnotifier) { 198 event_notifier_test_and_clear(&test->notifier); 199 } 200 return buf[addr]; 201 } 202 203 static void 204 pci_testdev_mmio_write(void *opaque, hwaddr addr, uint64_t val, 205 unsigned size) 206 { 207 pci_testdev_write(opaque, addr, val, size, 0); 208 } 209 210 static void 211 pci_testdev_pio_write(void *opaque, hwaddr addr, uint64_t val, 212 unsigned size) 213 { 214 pci_testdev_write(opaque, addr, val, size, 1); 215 } 216 217 static const MemoryRegionOps pci_testdev_mmio_ops = { 218 .read = pci_testdev_read, 219 .write = pci_testdev_mmio_write, 220 .endianness = DEVICE_LITTLE_ENDIAN, 221 .impl = { 222 .min_access_size = 1, 223 .max_access_size = 1, 224 }, 225 }; 226 227 static const MemoryRegionOps pci_testdev_pio_ops = { 228 .read = pci_testdev_read, 229 .write = pci_testdev_pio_write, 230 .endianness = DEVICE_LITTLE_ENDIAN, 231 .impl = { 232 .min_access_size = 1, 233 .max_access_size = 1, 234 }, 235 }; 236 237 static void pci_testdev_realize(PCIDevice *pci_dev, Error **errp) 238 { 239 PCITestDevState *d = PCI_TEST_DEV(pci_dev); 240 uint8_t *pci_conf; 241 char *name; 242 int r, i; 243 bool fastmmio = kvm_ioeventfd_any_length_enabled(); 244 245 pci_conf = pci_dev->config; 246 247 pci_conf[PCI_INTERRUPT_PIN] = 0; /* no interrupt pin */ 248 249 memory_region_init_io(&d->mmio, OBJECT(d), &pci_testdev_mmio_ops, d, 250 "pci-testdev-mmio", IOTEST_MEMSIZE * 2); 251 memory_region_init_io(&d->portio, OBJECT(d), &pci_testdev_pio_ops, d, 252 "pci-testdev-portio", IOTEST_IOSIZE * 2); 253 pci_register_bar(pci_dev, 0, PCI_BASE_ADDRESS_SPACE_MEMORY, &d->mmio); 254 pci_register_bar(pci_dev, 1, PCI_BASE_ADDRESS_SPACE_IO, &d->portio); 255 256 d->current = -1; 257 d->tests = g_malloc0(IOTEST_MAX * sizeof *d->tests); 258 for (i = 0; i < IOTEST_MAX; ++i) { 259 IOTest *test = &d->tests[i]; 260 name = g_strdup_printf("%s-%s", IOTEST_TYPE(i), IOTEST_TEST(i)); 261 test->bufsize = sizeof(PCITestDevHdr) + strlen(name) + 1; 262 test->hdr = g_malloc0(test->bufsize); 263 memcpy(test->hdr->name, name, strlen(name) + 1); 264 g_free(name); 265 test->hdr->offset = cpu_to_le32(IOTEST_SIZE(i) + i * IOTEST_ACCESS_WIDTH); 266 test->match_data = strcmp(IOTEST_TEST(i), "wildcard-eventfd"); 267 if (fastmmio && IOTEST_IS_MEM(i) && !test->match_data) { 268 test->size = 0; 269 } else { 270 test->size = IOTEST_ACCESS_WIDTH; 271 } 272 test->hdr->test = i; 273 test->hdr->data = test->match_data ? IOTEST_DATAMATCH : IOTEST_NOMATCH; 274 test->hdr->width = IOTEST_ACCESS_WIDTH; 275 test->mr = IOTEST_REGION(d, i); 276 if (!strcmp(IOTEST_TEST(i), "no-eventfd")) { 277 test->hasnotifier = false; 278 continue; 279 } 280 r = event_notifier_init(&test->notifier, 0); 281 assert(r >= 0); 282 test->hasnotifier = true; 283 } 284 } 285 286 static void 287 pci_testdev_uninit(PCIDevice *dev) 288 { 289 PCITestDevState *d = PCI_TEST_DEV(dev); 290 int i; 291 292 pci_testdev_reset(d); 293 for (i = 0; i < IOTEST_MAX; ++i) { 294 if (d->tests[i].hasnotifier) { 295 event_notifier_cleanup(&d->tests[i].notifier); 296 } 297 g_free(d->tests[i].hdr); 298 } 299 g_free(d->tests); 300 } 301 302 static void qdev_pci_testdev_reset(DeviceState *dev) 303 { 304 PCITestDevState *d = PCI_TEST_DEV(dev); 305 pci_testdev_reset(d); 306 } 307 308 static void pci_testdev_class_init(ObjectClass *klass, void *data) 309 { 310 DeviceClass *dc = DEVICE_CLASS(klass); 311 PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); 312 313 k->realize = pci_testdev_realize; 314 k->exit = pci_testdev_uninit; 315 k->vendor_id = PCI_VENDOR_ID_REDHAT; 316 k->device_id = PCI_DEVICE_ID_REDHAT_TEST; 317 k->revision = 0x00; 318 k->class_id = PCI_CLASS_OTHERS; 319 dc->desc = "PCI Test Device"; 320 set_bit(DEVICE_CATEGORY_MISC, dc->categories); 321 dc->reset = qdev_pci_testdev_reset; 322 } 323 324 static const TypeInfo pci_testdev_info = { 325 .name = TYPE_PCI_TEST_DEV, 326 .parent = TYPE_PCI_DEVICE, 327 .instance_size = sizeof(PCITestDevState), 328 .class_init = pci_testdev_class_init, 329 .interfaces = (InterfaceInfo[]) { 330 { INTERFACE_CONVENTIONAL_PCI_DEVICE }, 331 { }, 332 }, 333 }; 334 335 static void pci_testdev_register_types(void) 336 { 337 type_register_static(&pci_testdev_info); 338 } 339 340 type_init(pci_testdev_register_types) 341