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