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_device.h"
23 #include "hw/qdev-properties.h"
24 #include "qemu/event_notifier.h"
25 #include "qemu/module.h"
26 #include "sysemu/kvm.h"
27 #include "qom/object.h"
28
29 typedef struct PCITestDevHdr {
30 uint8_t test;
31 uint8_t width;
32 uint8_t pad0[2];
33 uint32_t offset;
34 uint8_t data;
35 uint8_t pad1[3];
36 uint32_t count;
37 uint8_t name[];
38 } PCITestDevHdr;
39
40 typedef struct IOTest {
41 MemoryRegion *mr;
42 EventNotifier notifier;
43 bool hasnotifier;
44 unsigned size;
45 bool match_data;
46 PCITestDevHdr *hdr;
47 unsigned bufsize;
48 } IOTest;
49
50 #define IOTEST_DATAMATCH 0xFA
51 #define IOTEST_NOMATCH 0xCE
52
53 #define IOTEST_IOSIZE 128
54 #define IOTEST_MEMSIZE 2048
55
56 static const char *iotest_test[] = {
57 "no-eventfd",
58 "wildcard-eventfd",
59 "datamatch-eventfd"
60 };
61
62 static const char *iotest_type[] = {
63 "mmio",
64 "portio"
65 };
66
67 #define IOTEST_TEST(i) (iotest_test[((i) % ARRAY_SIZE(iotest_test))])
68 #define IOTEST_TYPE(i) (iotest_type[((i) / ARRAY_SIZE(iotest_test))])
69 #define IOTEST_MAX_TEST (ARRAY_SIZE(iotest_test))
70 #define IOTEST_MAX_TYPE (ARRAY_SIZE(iotest_type))
71 #define IOTEST_MAX (IOTEST_MAX_TEST * IOTEST_MAX_TYPE)
72
73 enum {
74 IOTEST_ACCESS_NAME,
75 IOTEST_ACCESS_DATA,
76 IOTEST_ACCESS_MAX,
77 };
78
79 #define IOTEST_ACCESS_TYPE uint8_t
80 #define IOTEST_ACCESS_WIDTH (sizeof(uint8_t))
81
82 struct PCITestDevState {
83 /*< private >*/
84 PCIDevice parent_obj;
85 /*< public >*/
86
87 MemoryRegion mmio;
88 MemoryRegion portio;
89 IOTest *tests;
90 int current;
91
92 uint64_t membar_size;
93 MemoryRegion membar;
94 };
95
96 #define TYPE_PCI_TEST_DEV "pci-testdev"
97
OBJECT_DECLARE_SIMPLE_TYPE(PCITestDevState,PCI_TEST_DEV)98 OBJECT_DECLARE_SIMPLE_TYPE(PCITestDevState, 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
pci_testdev_stop(IOTest * test)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
pci_testdev_reset(PCITestDevState * d)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
pci_testdev_inc(IOTest * test,unsigned inc)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
pci_testdev_write(void * opaque,hwaddr addr,uint64_t val,unsigned size,int type)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
pci_testdev_read(void * opaque,hwaddr addr,unsigned size)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
pci_testdev_mmio_write(void * opaque,hwaddr addr,uint64_t val,unsigned size)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
pci_testdev_pio_write(void * opaque,hwaddr addr,uint64_t val,unsigned size)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
pci_testdev_realize(PCIDevice * pci_dev,Error ** errp)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
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 (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
pci_testdev_uninit(PCIDevice * dev)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
qdev_pci_testdev_reset(DeviceState * dev)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
pci_testdev_class_init(ObjectClass * klass,void * data)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 device_class_set_props(dc, 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
pci_testdev_register_types(void)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