hw/misc/pci-testdev.c

   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)