summaryrefslogtreecommitdiffstats
blob: 87ed3db671754a54e468ad1631c4b08f8c72635c (plain) (blame)
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
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
/*
 * Copyright (C) 2007 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#define TRACE_TAG USB

#include "sysdeps.h"

#include <dirent.h>
#include <errno.h>
#include <linux/usb/ch9.h>
#include <linux/usb/functionfs.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <unistd.h>

#include <algorithm>
#include <atomic>
#include <chrono>
#include <condition_variable>
#include <mutex>
#include <thread>

#include <android-base/logging.h>
#include <android-base/properties.h>

#include "adb.h"
#include "daemon/usb.h"
#include "transport.h"

using namespace std::chrono_literals;

#define MAX_PACKET_SIZE_FS 64
#define MAX_PACKET_SIZE_HS 512
#define MAX_PACKET_SIZE_SS 1024

#define USB_FFS_BULK_SIZE 16384

// Number of buffers needed to fit MAX_PAYLOAD, with an extra for ZLPs.
#define USB_FFS_NUM_BUFS ((MAX_PAYLOAD / USB_FFS_BULK_SIZE) + 1)

#define cpu_to_le16(x) htole16(x)
#define cpu_to_le32(x) htole32(x)

#define FUNCTIONFS_ENDPOINT_ALLOC       _IOR('g', 231, __u32)

static constexpr size_t ENDPOINT_ALLOC_RETRIES = 10;

static int dummy_fd = -1;

struct func_desc {
    struct usb_interface_descriptor intf;
    struct usb_endpoint_descriptor_no_audio source;
    struct usb_endpoint_descriptor_no_audio sink;
} __attribute__((packed));

struct ss_func_desc {
    struct usb_interface_descriptor intf;
    struct usb_endpoint_descriptor_no_audio source;
    struct usb_ss_ep_comp_descriptor source_comp;
    struct usb_endpoint_descriptor_no_audio sink;
    struct usb_ss_ep_comp_descriptor sink_comp;
} __attribute__((packed));

struct desc_v1 {
    struct usb_functionfs_descs_head_v1 {
        __le32 magic;
        __le32 length;
        __le32 fs_count;
        __le32 hs_count;
    } __attribute__((packed)) header;
    struct func_desc fs_descs, hs_descs;
} __attribute__((packed));

struct desc_v2 {
    struct usb_functionfs_descs_head_v2 header;
    // The rest of the structure depends on the flags in the header.
    __le32 fs_count;
    __le32 hs_count;
    __le32 ss_count;
    __le32 os_count;
    struct func_desc fs_descs, hs_descs;
    struct ss_func_desc ss_descs;
    struct usb_os_desc_header os_header;
    struct usb_ext_compat_desc os_desc;
} __attribute__((packed));

static struct func_desc fs_descriptors = {
    .intf = {
        .bLength = sizeof(fs_descriptors.intf),
        .bDescriptorType = USB_DT_INTERFACE,
        .bInterfaceNumber = 0,
        .bNumEndpoints = 2,
        .bInterfaceClass = ADB_CLASS,
        .bInterfaceSubClass = ADB_SUBCLASS,
        .bInterfaceProtocol = ADB_PROTOCOL,
        .iInterface = 1, /* first string from the provided table */
    },
    .source = {
        .bLength = sizeof(fs_descriptors.source),
        .bDescriptorType = USB_DT_ENDPOINT,
        .bEndpointAddress = 1 | USB_DIR_OUT,
        .bmAttributes = USB_ENDPOINT_XFER_BULK,
        .wMaxPacketSize = MAX_PACKET_SIZE_FS,
    },
    .sink = {
        .bLength = sizeof(fs_descriptors.sink),
        .bDescriptorType = USB_DT_ENDPOINT,
        .bEndpointAddress = 2 | USB_DIR_IN,
        .bmAttributes = USB_ENDPOINT_XFER_BULK,
        .wMaxPacketSize = MAX_PACKET_SIZE_FS,
    },
};

static struct func_desc hs_descriptors = {
    .intf = {
        .bLength = sizeof(hs_descriptors.intf),
        .bDescriptorType = USB_DT_INTERFACE,
        .bInterfaceNumber = 0,
        .bNumEndpoints = 2,
        .bInterfaceClass = ADB_CLASS,
        .bInterfaceSubClass = ADB_SUBCLASS,
        .bInterfaceProtocol = ADB_PROTOCOL,
        .iInterface = 1, /* first string from the provided table */
    },
    .source = {
        .bLength = sizeof(hs_descriptors.source),
        .bDescriptorType = USB_DT_ENDPOINT,
        .bEndpointAddress = 1 | USB_DIR_OUT,
        .bmAttributes = USB_ENDPOINT_XFER_BULK,
        .wMaxPacketSize = MAX_PACKET_SIZE_HS,
    },
    .sink = {
        .bLength = sizeof(hs_descriptors.sink),
        .bDescriptorType = USB_DT_ENDPOINT,
        .bEndpointAddress = 2 | USB_DIR_IN,
        .bmAttributes = USB_ENDPOINT_XFER_BULK,
        .wMaxPacketSize = MAX_PACKET_SIZE_HS,
    },
};

static struct ss_func_desc ss_descriptors = {
    .intf = {
        .bLength = sizeof(ss_descriptors.intf),
        .bDescriptorType = USB_DT_INTERFACE,
        .bInterfaceNumber = 0,
        .bNumEndpoints = 2,
        .bInterfaceClass = ADB_CLASS,
        .bInterfaceSubClass = ADB_SUBCLASS,
        .bInterfaceProtocol = ADB_PROTOCOL,
        .iInterface = 1, /* first string from the provided table */
    },
    .source = {
        .bLength = sizeof(ss_descriptors.source),
        .bDescriptorType = USB_DT_ENDPOINT,
        .bEndpointAddress = 1 | USB_DIR_OUT,
        .bmAttributes = USB_ENDPOINT_XFER_BULK,
        .wMaxPacketSize = MAX_PACKET_SIZE_SS,
    },
    .source_comp = {
        .bLength = sizeof(ss_descriptors.source_comp),
        .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
        .bMaxBurst = 4,
    },
    .sink = {
        .bLength = sizeof(ss_descriptors.sink),
        .bDescriptorType = USB_DT_ENDPOINT,
        .bEndpointAddress = 2 | USB_DIR_IN,
        .bmAttributes = USB_ENDPOINT_XFER_BULK,
        .wMaxPacketSize = MAX_PACKET_SIZE_SS,
    },
    .sink_comp = {
        .bLength = sizeof(ss_descriptors.sink_comp),
        .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
        .bMaxBurst = 4,
    },
};

struct usb_ext_compat_desc os_desc_compat = {
    .bFirstInterfaceNumber = 0,
    .Reserved1 = cpu_to_le32(1),
    .CompatibleID = {0},
    .SubCompatibleID = {0},
    .Reserved2 = {0},
};

static struct usb_os_desc_header os_desc_header = {
    .interface = cpu_to_le32(1),
    .dwLength = cpu_to_le32(sizeof(os_desc_header) + sizeof(os_desc_compat)),
    .bcdVersion = cpu_to_le32(1),
    .wIndex = cpu_to_le32(4),
    .bCount = cpu_to_le32(1),
    .Reserved = cpu_to_le32(0),
};

#define STR_INTERFACE_ "ADB Interface"

static const struct {
    struct usb_functionfs_strings_head header;
    struct {
        __le16 code;
        const char str1[sizeof(STR_INTERFACE_)];
    } __attribute__((packed)) lang0;
} __attribute__((packed)) strings = {
    .header = {
        .magic = cpu_to_le32(FUNCTIONFS_STRINGS_MAGIC),
        .length = cpu_to_le32(sizeof(strings)),
        .str_count = cpu_to_le32(1),
        .lang_count = cpu_to_le32(1),
    },
    .lang0 = {
        cpu_to_le16(0x0409), /* en-us */
        STR_INTERFACE_,
    },
};

static void aio_block_init(aio_block* aiob) {
    aiob->iocb.resize(USB_FFS_NUM_BUFS);
    aiob->iocbs.resize(USB_FFS_NUM_BUFS);
    aiob->events.resize(USB_FFS_NUM_BUFS);
    aiob->num_submitted = 0;
    for (unsigned i = 0; i < USB_FFS_NUM_BUFS; i++) {
        aiob->iocbs[i] = &aiob->iocb[i];
    }
}

static int getMaxPacketSize(int ffs_fd) {
    usb_endpoint_descriptor desc;
    if (ioctl(ffs_fd, FUNCTIONFS_ENDPOINT_DESC, reinterpret_cast<unsigned long>(&desc))) {
        D("[ could not get endpoint descriptor! (%d) ]", errno);
        return MAX_PACKET_SIZE_HS;
    } else {
        return desc.wMaxPacketSize;
    }
}

bool init_functionfs(struct usb_handle* h) {
    LOG(INFO) << "initializing functionfs";

    ssize_t ret;
    struct desc_v1 v1_descriptor;
    struct desc_v2 v2_descriptor;
    size_t retries = 0;

    v2_descriptor.header.magic = cpu_to_le32(FUNCTIONFS_DESCRIPTORS_MAGIC_V2);
    v2_descriptor.header.length = cpu_to_le32(sizeof(v2_descriptor));
    v2_descriptor.header.flags = FUNCTIONFS_HAS_FS_DESC | FUNCTIONFS_HAS_HS_DESC |
                                 FUNCTIONFS_HAS_SS_DESC | FUNCTIONFS_HAS_MS_OS_DESC;
    v2_descriptor.fs_count = 3;
    v2_descriptor.hs_count = 3;
    v2_descriptor.ss_count = 5;
    v2_descriptor.os_count = 1;
    v2_descriptor.fs_descs = fs_descriptors;
    v2_descriptor.hs_descs = hs_descriptors;
    v2_descriptor.ss_descs = ss_descriptors;
    v2_descriptor.os_header = os_desc_header;
    v2_descriptor.os_desc = os_desc_compat;

    if (h->control < 0) { // might have already done this before
        LOG(INFO) << "opening control endpoint " << USB_FFS_ADB_EP0;
        h->control = adb_open(USB_FFS_ADB_EP0, O_RDWR);
        if (h->control < 0) {
            PLOG(ERROR) << "cannot open control endpoint " << USB_FFS_ADB_EP0;
            goto err;
        }

        ret = adb_write(h->control, &v2_descriptor, sizeof(v2_descriptor));
        if (ret < 0) {
            v1_descriptor.header.magic = cpu_to_le32(FUNCTIONFS_DESCRIPTORS_MAGIC);
            v1_descriptor.header.length = cpu_to_le32(sizeof(v1_descriptor));
            v1_descriptor.header.fs_count = 3;
            v1_descriptor.header.hs_count = 3;
            v1_descriptor.fs_descs = fs_descriptors;
            v1_descriptor.hs_descs = hs_descriptors;
            D("[ %s: Switching to V1_descriptor format errno=%d ]", USB_FFS_ADB_EP0, errno);
            ret = adb_write(h->control, &v1_descriptor, sizeof(v1_descriptor));
            if (ret < 0) {
                D("[ %s: write descriptors failed: errno=%d ]", USB_FFS_ADB_EP0, errno);
                goto err;
            }
        }

        ret = adb_write(h->control, &strings, sizeof(strings));
        if (ret < 0) {
            D("[ %s: writing strings failed: errno=%d]", USB_FFS_ADB_EP0, errno);
            goto err;
        }
        //Signal only when writing the descriptors to ffs
        android::base::SetProperty("sys.usb.ffs.ready", "1");
    }

    h->bulk_out = adb_open(USB_FFS_ADB_OUT, O_RDWR);
    if (h->bulk_out < 0) {
        PLOG(ERROR) << "cannot open bulk-out endpoint " << USB_FFS_ADB_OUT;
        goto err;
    }

    h->bulk_in = adb_open(USB_FFS_ADB_IN, O_RDWR);
    if (h->bulk_in < 0) {
        PLOG(ERROR) << "cannot open bulk-in endpoint " << USB_FFS_ADB_IN;
        goto err;
    }

    if (io_setup(USB_FFS_NUM_BUFS, &h->read_aiob.ctx) ||
        io_setup(USB_FFS_NUM_BUFS, &h->write_aiob.ctx)) {
        D("[ aio: got error on io_setup (%d) ]", errno);
    }

    h->read_aiob.fd = h->bulk_out;
    h->write_aiob.fd = h->bulk_in;

    h->max_rw = MAX_PAYLOAD;
    while (h->max_rw >= USB_FFS_BULK_SIZE && retries < ENDPOINT_ALLOC_RETRIES) {
        int ret_in = ioctl(h->bulk_in, FUNCTIONFS_ENDPOINT_ALLOC, static_cast<__u32>(h->max_rw));
        int errno_in = errno;
        int ret_out = ioctl(h->bulk_out, FUNCTIONFS_ENDPOINT_ALLOC, static_cast<__u32>(h->max_rw));
        int errno_out = errno;

        if (ret_in || ret_out) {
            if (errno_in == ENODEV || errno_out == ENODEV) {
                std::this_thread::sleep_for(100ms);
                retries += 1;
                continue;
            }
            h->max_rw /= 2;
        } else {
            return true;
        }
    }

    D("[ adb: cannot call endpoint alloc: errno=%d ]", errno);
    // Kernel pre-allocation could have failed for recoverable reasons.
    // Continue running with a safe max rw size.
    h->max_rw = USB_FFS_BULK_SIZE;
    return true;

err:
    if (h->bulk_in > 0) {
        adb_close(h->bulk_in);
        h->bulk_in = -1;
    }
    if (h->bulk_out > 0) {
        adb_close(h->bulk_out);
        h->bulk_out = -1;
    }
    if (h->control > 0) {
        adb_close(h->control);
        h->control = -1;
    }
    return false;
}

static void usb_ffs_open_thread(void* x) {
    struct usb_handle* usb = (struct usb_handle*)x;

    adb_thread_setname("usb ffs open");

    while (true) {
        // wait until the USB device needs opening
        std::unique_lock<std::mutex> lock(usb->lock);
        while (!usb->open_new_connection) {
            usb->notify.wait(lock);
        }
        usb->open_new_connection = false;
        lock.unlock();

        while (true) {
            if (init_functionfs(usb)) {
                LOG(INFO) << "functionfs successfully initialized";
                break;
            }
            std::this_thread::sleep_for(1s);
        }

        LOG(INFO) << "registering usb transport";
        register_usb_transport(usb, 0, 0, 1);
    }

    // never gets here
    abort();
}

static int usb_ffs_write(usb_handle* h, const void* data, int len) {
    D("about to write (fd=%d, len=%d)", h->bulk_in, len);

    const char* buf = static_cast<const char*>(data);
    while (len > 0) {
        int write_len = std::min(h->max_rw, len);
        int n = adb_write(h->bulk_in, buf, write_len);
        if (n < 0) {
            D("ERROR: fd = %d, n = %d: %s", h->bulk_in, n, strerror(errno));
            return -1;
        }
        buf += n;
        len -= n;
    }

    D("[ done fd=%d ]", h->bulk_in);
    return 0;
}

static int usb_ffs_read(usb_handle* h, void* data, int len) {
    D("about to read (fd=%d, len=%d)", h->bulk_out, len);

    char* buf = static_cast<char*>(data);
    while (len > 0) {
        int read_len = std::min(h->max_rw, len);
        int n = adb_read(h->bulk_out, buf, read_len);
        if (n < 0) {
            D("ERROR: fd = %d, n = %d: %s", h->bulk_out, n, strerror(errno));
            return -1;
        }
        buf += n;
        len -= n;
    }

    D("[ done fd=%d ]", h->bulk_out);
    return 0;
}

static int usb_ffs_do_aio(usb_handle* h, const void* data, int len, bool read) {
    aio_block* aiob = read ? &h->read_aiob : &h->write_aiob;
    bool zero_packet = false;

    int num_bufs = len / USB_FFS_BULK_SIZE + (len % USB_FFS_BULK_SIZE == 0 ? 0 : 1);
    const char* cur_data = reinterpret_cast<const char*>(data);
    int packet_size = getMaxPacketSize(aiob->fd);

    if (posix_madvise(const_cast<void*>(data), len, POSIX_MADV_SEQUENTIAL | POSIX_MADV_WILLNEED) <
        0) {
        D("[ Failed to madvise: %d ]", errno);
    }

    for (int i = 0; i < num_bufs; i++) {
        int buf_len = std::min(len, USB_FFS_BULK_SIZE);
        io_prep(&aiob->iocb[i], aiob->fd, cur_data, buf_len, 0, read);

        len -= buf_len;
        cur_data += buf_len;

        if (len == 0 && buf_len % packet_size == 0 && read) {
            // adb does not expect the device to send a zero packet after data transfer,
            // but the host *does* send a zero packet for the device to read.
            zero_packet = true;
        }
    }
    if (zero_packet) {
        io_prep(&aiob->iocb[num_bufs], aiob->fd, reinterpret_cast<const void*>(cur_data),
                packet_size, 0, read);
        num_bufs += 1;
    }

    if (io_submit(aiob->ctx, num_bufs, aiob->iocbs.data()) < num_bufs) {
        D("[ aio: got error submitting %s (%d) ]", read ? "read" : "write", errno);
        return -1;
    }
    if (TEMP_FAILURE_RETRY(
            io_getevents(aiob->ctx, num_bufs, num_bufs, aiob->events.data(), nullptr)) < num_bufs) {
        D("[ aio: got error waiting %s (%d) ]", read ? "read" : "write", errno);
        return -1;
    }
    for (int i = 0; i < num_bufs; i++) {
        if (aiob->events[i].res < 0) {
            errno = aiob->events[i].res;
            D("[ aio: got error event on %s (%d) ]", read ? "read" : "write", errno);
            return -1;
        }
    }
    return 0;
}

static int usb_ffs_aio_read(usb_handle* h, void* data, int len) {
    return usb_ffs_do_aio(h, data, len, true);
}

static int usb_ffs_aio_write(usb_handle* h, const void* data, int len) {
    return usb_ffs_do_aio(h, data, len, false);
}

static void usb_ffs_kick(usb_handle* h) {
    int err;

    err = ioctl(h->bulk_in, FUNCTIONFS_CLEAR_HALT);
    if (err < 0) {
        D("[ kick: source (fd=%d) clear halt failed (%d) ]", h->bulk_in, errno);
    }

    err = ioctl(h->bulk_out, FUNCTIONFS_CLEAR_HALT);
    if (err < 0) {
        D("[ kick: sink (fd=%d) clear halt failed (%d) ]", h->bulk_out, errno);
    }

    // don't close ep0 here, since we may not need to reinitialize it with
    // the same descriptors again. if however ep1/ep2 fail to re-open in
    // init_functionfs, only then would we close and open ep0 again.
    // Ditto the comment in usb_adb_kick.
    h->kicked = true;
    TEMP_FAILURE_RETRY(dup2(dummy_fd, h->bulk_out));
    TEMP_FAILURE_RETRY(dup2(dummy_fd, h->bulk_in));
}

static void usb_ffs_close(usb_handle* h) {
    LOG(INFO) << "closing functionfs transport";

    h->kicked = false;
    adb_close(h->bulk_out);
    adb_close(h->bulk_in);
    io_destroy(h->read_aiob.ctx);
    io_destroy(h->write_aiob.ctx);

    // Notify usb_adb_open_thread to open a new connection.
    h->lock.lock();
    h->open_new_connection = true;
    h->lock.unlock();
    h->notify.notify_one();
}

static void usb_ffs_init() {
    D("[ usb_init - using FunctionFS ]");

    usb_handle* h = new usb_handle();

    if (android::base::GetBoolProperty("sys.usb.ffs.aio_compat", false)) {
        // Devices on older kernels (< 3.18) will not have aio support for ffs
        // unless backported. Fall back on the non-aio functions instead.
        h->write = usb_ffs_write;
        h->read = usb_ffs_read;
    } else {
        h->write = usb_ffs_aio_write;
        h->read = usb_ffs_aio_read;
        aio_block_init(&h->read_aiob);
        aio_block_init(&h->write_aiob);
    }
    h->kick = usb_ffs_kick;
    h->close = usb_ffs_close;

    D("[ usb_init - starting thread ]");
    std::thread(usb_ffs_open_thread, h).detach();
}

void usb_init() {
    dummy_fd = adb_open("/dev/null", O_WRONLY);
    CHECK_NE(dummy_fd, -1);
    usb_ffs_init();
}

int usb_write(usb_handle* h, const void* data, int len) {
    return h->write(h, data, len);
}

int usb_read(usb_handle* h, void* data, int len) {
    return h->read(h, data, len);
}

int usb_close(usb_handle* h) {
    h->close(h);
    return 0;
}

void usb_kick(usb_handle* h) {
    h->kick(h);
}