aboutsummaryrefslogtreecommitdiff
path: root/hw/xen/xen-host-pci-device.c
blob: 7d8a0237cfca6d4958f7408d6bfcc28a2ef2f2fd (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
/*
 * Copyright (C) 2011       Citrix Ltd.
 *
 * This work is licensed under the terms of the GNU GPL, version 2.  See
 * the COPYING file in the top-level directory.
 *
 */

#include "qemu-common.h"
#include "xen-host-pci-device.h"

#define XEN_HOST_PCI_MAX_EXT_CAP \
    ((PCIE_CONFIG_SPACE_SIZE - PCI_CONFIG_SPACE_SIZE) / (PCI_CAP_SIZEOF + 4))

#ifdef XEN_HOST_PCI_DEVICE_DEBUG
#  define XEN_HOST_PCI_LOG(f, a...) fprintf(stderr, "%s: " f, __func__, ##a)
#else
#  define XEN_HOST_PCI_LOG(f, a...) (void)0
#endif

/*
 * from linux/ioport.h
 * IO resources have these defined flags.
 */
#define IORESOURCE_BITS         0x000000ff      /* Bus-specific bits */

#define IORESOURCE_TYPE_BITS    0x00000f00      /* Resource type */
#define IORESOURCE_IO           0x00000100
#define IORESOURCE_MEM          0x00000200

#define IORESOURCE_PREFETCH     0x00001000      /* No side effects */
#define IORESOURCE_MEM_64       0x00100000

static int xen_host_pci_sysfs_path(const XenHostPCIDevice *d,
                                   const char *name, char *buf, ssize_t size)
{
    int rc;

    rc = snprintf(buf, size, "/sys/bus/pci/devices/%04x:%02x:%02x.%d/%s",
                  d->domain, d->bus, d->dev, d->func, name);

    if (rc >= size || rc < 0) {
        /* The output is truncated, or some other error was encountered */
        return -ENODEV;
    }
    return 0;
}


/* This size should be enough to read the first 7 lines of a resource file */
#define XEN_HOST_PCI_RESOURCE_BUFFER_SIZE 400
static int xen_host_pci_get_resource(XenHostPCIDevice *d)
{
    int i, rc, fd;
    char path[PATH_MAX];
    char buf[XEN_HOST_PCI_RESOURCE_BUFFER_SIZE];
    unsigned long long start, end, flags, size;
    char *endptr, *s;
    uint8_t type;

    rc = xen_host_pci_sysfs_path(d, "resource", path, sizeof (path));
    if (rc) {
        return rc;
    }
    fd = open(path, O_RDONLY);
    if (fd == -1) {
        XEN_HOST_PCI_LOG("Error: Can't open %s: %s\n", path, strerror(errno));
        return -errno;
    }

    do {
        rc = read(fd, &buf, sizeof (buf) - 1);
        if (rc < 0 && errno != EINTR) {
            rc = -errno;
            goto out;
        }
    } while (rc < 0);
    buf[rc] = 0;
    rc = 0;

    s = buf;
    for (i = 0; i < PCI_NUM_REGIONS; i++) {
        type = 0;

        start = strtoll(s, &endptr, 16);
        if (*endptr != ' ' || s == endptr) {
            break;
        }
        s = endptr + 1;
        end = strtoll(s, &endptr, 16);
        if (*endptr != ' ' || s == endptr) {
            break;
        }
        s = endptr + 1;
        flags = strtoll(s, &endptr, 16);
        if (*endptr != '\n' || s == endptr) {
            break;
        }
        s = endptr + 1;

        if (start) {
            size = end - start + 1;
        } else {
            size = 0;
        }

        if (flags & IORESOURCE_IO) {
            type |= XEN_HOST_PCI_REGION_TYPE_IO;
        }
        if (flags & IORESOURCE_MEM) {
            type |= XEN_HOST_PCI_REGION_TYPE_MEM;
        }
        if (flags & IORESOURCE_PREFETCH) {
            type |= XEN_HOST_PCI_REGION_TYPE_PREFETCH;
        }
        if (flags & IORESOURCE_MEM_64) {
            type |= XEN_HOST_PCI_REGION_TYPE_MEM_64;
        }

        if (i < PCI_ROM_SLOT) {
            d->io_regions[i].base_addr = start;
            d->io_regions[i].size = size;
            d->io_regions[i].type = type;
            d->io_regions[i].bus_flags = flags & IORESOURCE_BITS;
        } else {
            d->rom.base_addr = start;
            d->rom.size = size;
            d->rom.type = type;
            d->rom.bus_flags = flags & IORESOURCE_BITS;
        }
    }
    if (i != PCI_NUM_REGIONS) {
        /* Invalid format or input to short */
        rc = -ENODEV;
    }

out:
    close(fd);
    return rc;
}

/* This size should be enough to read a long from a file */
#define XEN_HOST_PCI_GET_VALUE_BUFFER_SIZE 22
static int xen_host_pci_get_value(XenHostPCIDevice *d, const char *name,
                                  unsigned int *pvalue, int base)
{
    char path[PATH_MAX];
    char buf[XEN_HOST_PCI_GET_VALUE_BUFFER_SIZE];
    int fd, rc;
    unsigned long value;
    char *endptr;

    rc = xen_host_pci_sysfs_path(d, name, path, sizeof (path));
    if (rc) {
        return rc;
    }
    fd = open(path, O_RDONLY);
    if (fd == -1) {
        XEN_HOST_PCI_LOG("Error: Can't open %s: %s\n", path, strerror(errno));
        return -errno;
    }
    do {
        rc = read(fd, &buf, sizeof (buf) - 1);
        if (rc < 0 && errno != EINTR) {
            rc = -errno;
            goto out;
        }
    } while (rc < 0);
    buf[rc] = 0;
    value = strtol(buf, &endptr, base);
    if (endptr == buf || *endptr != '\n') {
        rc = -1;
    } else if ((value == LONG_MIN || value == LONG_MAX) && errno == ERANGE) {
        rc = -errno;
    } else {
        rc = 0;
        *pvalue = value;
    }
out:
    close(fd);
    return rc;
}

static inline int xen_host_pci_get_hex_value(XenHostPCIDevice *d,
                                             const char *name,
                                             unsigned int *pvalue)
{
    return xen_host_pci_get_value(d, name, pvalue, 16);
}

static inline int xen_host_pci_get_dec_value(XenHostPCIDevice *d,
                                             const char *name,
                                             unsigned int *pvalue)
{
    return xen_host_pci_get_value(d, name, pvalue, 10);
}

static bool xen_host_pci_dev_is_virtfn(XenHostPCIDevice *d)
{
    char path[PATH_MAX];
    struct stat buf;

    if (xen_host_pci_sysfs_path(d, "physfn", path, sizeof (path))) {
        return false;
    }
    return !stat(path, &buf);
}

static int xen_host_pci_config_open(XenHostPCIDevice *d)
{
    char path[PATH_MAX];
    int rc;

    rc = xen_host_pci_sysfs_path(d, "config", path, sizeof (path));
    if (rc) {
        return rc;
    }
    d->config_fd = open(path, O_RDWR);
    if (d->config_fd < 0) {
        return -errno;
    }
    return 0;
}

static int xen_host_pci_config_read(XenHostPCIDevice *d,
                                    int pos, void *buf, int len)
{
    int rc;

    do {
        rc = pread(d->config_fd, buf, len, pos);
    } while (rc < 0 && (errno == EINTR || errno == EAGAIN));
    if (rc != len) {
        return -errno;
    }
    return 0;
}

static int xen_host_pci_config_write(XenHostPCIDevice *d,
                                     int pos, const void *buf, int len)
{
    int rc;

    do {
        rc = pwrite(d->config_fd, buf, len, pos);
    } while (rc < 0 && (errno == EINTR || errno == EAGAIN));
    if (rc != len) {
        return -errno;
    }
    return 0;
}


int xen_host_pci_get_byte(XenHostPCIDevice *d, int pos, uint8_t *p)
{
    uint8_t buf;
    int rc = xen_host_pci_config_read(d, pos, &buf, 1);
    if (!rc) {
        *p = buf;
    }
    return rc;
}

int xen_host_pci_get_word(XenHostPCIDevice *d, int pos, uint16_t *p)
{
    uint16_t buf;
    int rc = xen_host_pci_config_read(d, pos, &buf, 2);
    if (!rc) {
        *p = le16_to_cpu(buf);
    }
    return rc;
}

int xen_host_pci_get_long(XenHostPCIDevice *d, int pos, uint32_t *p)
{
    uint32_t buf;
    int rc = xen_host_pci_config_read(d, pos, &buf, 4);
    if (!rc) {
        *p = le32_to_cpu(buf);
    }
    return rc;
}

int xen_host_pci_get_block(XenHostPCIDevice *d, int pos, uint8_t *buf, int len)
{
    return xen_host_pci_config_read(d, pos, buf, len);
}

int xen_host_pci_set_byte(XenHostPCIDevice *d, int pos, uint8_t data)
{
    return xen_host_pci_config_write(d, pos, &data, 1);
}

int xen_host_pci_set_word(XenHostPCIDevice *d, int pos, uint16_t data)
{
    data = cpu_to_le16(data);
    return xen_host_pci_config_write(d, pos, &data, 2);
}

int xen_host_pci_set_long(XenHostPCIDevice *d, int pos, uint32_t data)
{
    data = cpu_to_le32(data);
    return xen_host_pci_config_write(d, pos, &data, 4);
}

int xen_host_pci_set_block(XenHostPCIDevice *d, int pos, uint8_t *buf, int len)
{
    return xen_host_pci_config_write(d, pos, buf, len);
}

int xen_host_pci_find_ext_cap_offset(XenHostPCIDevice *d, uint32_t cap)
{
    uint32_t header = 0;
    int max_cap = XEN_HOST_PCI_MAX_EXT_CAP;
    int pos = PCI_CONFIG_SPACE_SIZE;

    do {
        if (xen_host_pci_get_long(d, pos, &header)) {
            break;
        }
        /*
         * If we have no capabilities, this is indicated by cap ID,
         * cap version and next pointer all being 0.
         */
        if (header == 0) {
            break;
        }

        if (PCI_EXT_CAP_ID(header) == cap) {
            return pos;
        }

        pos = PCI_EXT_CAP_NEXT(header);
        if (pos < PCI_CONFIG_SPACE_SIZE) {
            break;
        }

        max_cap--;
    } while (max_cap > 0);

    return -1;
}

int xen_host_pci_device_get(XenHostPCIDevice *d, uint16_t domain,
                            uint8_t bus, uint8_t dev, uint8_t func)
{
    unsigned int v;
    int rc = 0;

    d->config_fd = -1;
    d->domain = domain;
    d->bus = bus;
    d->dev = dev;
    d->func = func;

    rc = xen_host_pci_config_open(d);
    if (rc) {
        goto error;
    }
    rc = xen_host_pci_get_resource(d);
    if (rc) {
        goto error;
    }
    rc = xen_host_pci_get_hex_value(d, "vendor", &v);
    if (rc) {
        goto error;
    }
    d->vendor_id = v;
    rc = xen_host_pci_get_hex_value(d, "device", &v);
    if (rc) {
        goto error;
    }
    d->device_id = v;
    rc = xen_host_pci_get_dec_value(d, "irq", &v);
    if (rc) {
        goto error;
    }
    d->irq = v;
    rc = xen_host_pci_get_hex_value(d, "class", &v);
    if (rc) {
        goto error;
    }
    d->class_code = v;
    d->is_virtfn = xen_host_pci_dev_is_virtfn(d);

    return 0;
error:
    if (d->config_fd >= 0) {
        close(d->config_fd);
        d->config_fd = -1;
    }
    return rc;
}

bool xen_host_pci_device_closed(XenHostPCIDevice *d)
{
    return d->config_fd == -1;
}

void xen_host_pci_device_put(XenHostPCIDevice *d)
{
    if (d->config_fd >= 0) {
        close(d->config_fd);
        d->config_fd = -1;
    }
}