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/*
* 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.
*/
#include "usb.h"
#include <dirent.h>
#include <errno.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 <linux/usb/ch9.h>
#include <linux/usb/functionfs.h>
#include <algorithm>
#include <atomic>
#include <chrono>
#include <condition_variable>
#include <mutex>
#include <thread>
#include <android-base/logging.h>
#include <android-base/properties.h>
using namespace std::chrono_literals;
#define D(...)
#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 ((4 * MAX_PAYLOAD / USB_FFS_BULK_SIZE) + 1)
static void aio_block_init(aio_block* aiob, unsigned num_bufs) {
aiob->iocb.resize(num_bufs);
aiob->iocbs.resize(num_bufs);
aiob->events.resize(num_bufs);
aiob->num_submitted = 0;
for (unsigned i = 0; i < num_bufs; i++) {
aiob->iocbs[i] = &aiob->iocb[i];
}
memset(&aiob->ctx, 0, sizeof(aiob->ctx));
if (io_setup(num_bufs, &aiob->ctx)) {
D("[ aio: got error on io_setup (%d) ]", errno);
}
}
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;
}
}
static int usb_ffs_write(usb_handle* h, const void* data, int len) {
D("about to write (fd=%d, len=%d)", h->bulk_in.get(), len);
const char* buf = static_cast<const char*>(data);
int orig_len = len;
while (len > 0) {
int write_len = std::min(USB_FFS_BULK_SIZE, len);
int n = write(h->bulk_in, buf, write_len);
if (n < 0) {
D("ERROR: fd = %d, n = %d: %s", h->bulk_in.get(), n, strerror(errno));
return -1;
}
buf += n;
len -= n;
}
D("[ done fd=%d ]", h->bulk_in.get());
return orig_len;
}
static int usb_ffs_read(usb_handle* h, void* data, int len, bool allow_partial) {
D("about to read (fd=%d, len=%d)", h->bulk_out.get(), len);
char* buf = static_cast<char*>(data);
int orig_len = len;
unsigned count = 0;
while (len > 0) {
int read_len = std::min(USB_FFS_BULK_SIZE, len);
int n = read(h->bulk_out, buf, read_len);
if (n < 0) {
D("ERROR: fd = %d, n = %d: %s", h->bulk_out.get(), n, strerror(errno));
return -1;
}
buf += n;
len -= n;
count += n;
// For fastbootd command such as "getvar all", len parameter is always set 64.
// But what we read is actually less than 64.
// For example, length 10 for "getvar all" command.
// If we get less data than expected, this means there should be no more data.
if (allow_partial && n < read_len) {
orig_len = count;
break;
}
}
D("[ done fd=%d ]", h->bulk_out.get());
return orig_len;
}
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 / h->io_size + (len % h->io_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, static_cast<int>(h->io_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 = h->reads_zero_packets;
}
}
if (zero_packet) {
io_prep(&aiob->iocb[num_bufs], aiob->fd, reinterpret_cast<const void*>(cur_data),
packet_size, 0, read);
num_bufs += 1;
}
while (true) {
if (TEMP_FAILURE_RETRY(io_submit(aiob->ctx, num_bufs, aiob->iocbs.data())) < num_bufs) {
PLOG(ERROR) << "aio: got error submitting " << (read ? "read" : "write");
return -1;
}
if (TEMP_FAILURE_RETRY(io_getevents(aiob->ctx, num_bufs, num_bufs, aiob->events.data(),
nullptr)) < num_bufs) {
PLOG(ERROR) << "aio: got error waiting " << (read ? "read" : "write");
return -1;
}
if (num_bufs == 1 && aiob->events[0].res == -EINTR) {
continue;
}
int ret = 0;
for (int i = 0; i < num_bufs; i++) {
if (aiob->events[i].res < 0) {
errno = -aiob->events[i].res;
PLOG(ERROR) << "aio: got error event on " << (read ? "read" : "write")
<< " total bufs " << num_bufs;
return -1;
}
ret += aiob->events[i].res;
}
return ret;
}
}
static int usb_ffs_aio_read(usb_handle* h, void* data, int len, bool /* allow_partial */) {
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_close(usb_handle* h) {
LOG(INFO) << "closing functionfs transport";
h->bulk_out.reset();
h->bulk_in.reset();
// 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();
}
usb_handle* create_usb_handle(unsigned num_bufs, unsigned io_size) {
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, num_bufs);
aio_block_init(&h->write_aiob, num_bufs);
}
h->io_size = io_size;
h->close = usb_ffs_close;
return h;
}
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