330 lines
11 KiB
C++
330 lines
11 KiB
C++
/*
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* Copyright (c) 2011, Code Aurora Forum. All rights reserved.
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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* * Neither the name of Code Aurora Forum, Inc. nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
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* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <cutils/log.h>
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#include <cutils/native_handle.h>
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#include <gralloc_priv.h>
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#include <linux/genlock.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include "genlock.h"
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#define GENLOCK_DEVICE "/dev/genlock"
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#ifndef USE_GENLOCK
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#define USE_GENLOCK
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#endif
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namespace {
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/* Internal function to map the userspace locks to the kernel lock types */
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int get_kernel_lock_type(genlock_lock_type lockType)
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{
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int kLockType = 0;
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// If the user sets both a read and write lock, higher preference is
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// given to the write lock.
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if (lockType & GENLOCK_WRITE_LOCK) {
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kLockType = GENLOCK_WRLOCK;
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} else if (lockType & GENLOCK_READ_LOCK) {
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kLockType = GENLOCK_RDLOCK;
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} else {
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LOGE("%s: invalid lockType (lockType = %d)", __FUNCTION__, lockType);
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return -1;
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}
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return kLockType;
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}
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/* Internal function to perform the actual lock/unlock operations */
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genlock_status_t perform_lock_unlock_operation(native_handle_t *buffer_handle,
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int lockType, int timeout)
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{
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if (private_handle_t::validate(buffer_handle)) {
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LOGE("%s: handle is invalid", __FUNCTION__);
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return GENLOCK_FAILURE;
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}
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private_handle_t *hnd = reinterpret_cast<private_handle_t*>(buffer_handle);
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if ((hnd->flags & private_handle_t::PRIV_FLAGS_UNSYNCHRONIZED) == 0) {
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if (hnd->genlockPrivFd < 0) {
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LOGE("%s: the lock has not been created, or has not been attached",
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__FUNCTION__);
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return GENLOCK_FAILURE;
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}
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genlock_lock lock;
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lock.op = lockType;
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lock.flags = 0;
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lock.timeout = timeout;
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lock.fd = hnd->genlockHandle;
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if (ioctl(hnd->genlockPrivFd, GENLOCK_IOC_LOCK, &lock)) {
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LOGE("%s: GENLOCK_IOC_LOCK failed (lockType0x%x, err=%s fd=%d)", __FUNCTION__,
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lockType, strerror(errno), hnd->fd);
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if (ETIMEDOUT == errno)
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return GENLOCK_TIMEDOUT;
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return GENLOCK_FAILURE;
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}
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}
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return GENLOCK_NO_ERROR;
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}
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/* Internal function to close the fd and release the handle */
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void close_genlock_fd_and_handle(int& fd, int& handle)
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{
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if (fd >=0 ) {
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close(fd);
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fd = -1;
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}
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if (handle >= 0) {
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close(handle);
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handle = -1;
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}
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}
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}
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/*
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* Create a genlock lock. The genlock lock file descriptor and the lock
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* handle are stored in the buffer_handle.
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*
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* @param: handle of the buffer
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* @return error status.
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*/
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genlock_status_t genlock_create_lock(native_handle_t *buffer_handle)
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{
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genlock_status_t ret = GENLOCK_NO_ERROR;
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if (private_handle_t::validate(buffer_handle)) {
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LOGE("%s: handle is invalid", __FUNCTION__);
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return GENLOCK_FAILURE;
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}
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private_handle_t *hnd = reinterpret_cast<private_handle_t*>(buffer_handle);
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#ifdef USE_GENLOCK
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if ((hnd->flags & private_handle_t::PRIV_FLAGS_UNSYNCHRONIZED) == 0) {
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// Open the genlock device
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int fd = open(GENLOCK_DEVICE, O_RDWR);
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if (fd < 0) {
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LOGE("%s: open genlock device failed (err=%s)", __FUNCTION__,
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strerror(errno));
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return GENLOCK_FAILURE;
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}
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// Create a new lock
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genlock_lock lock;
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if (ioctl(fd, GENLOCK_IOC_NEW, NULL)) {
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LOGE("%s: GENLOCK_IOC_NEW failed (error=%s)", __FUNCTION__,
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strerror(errno));
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close_genlock_fd_and_handle(fd, lock.fd);
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ret = GENLOCK_FAILURE;
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}
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// Export the lock for other processes to be able to use it.
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if (GENLOCK_FAILURE != ret) {
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if (ioctl(fd, GENLOCK_IOC_EXPORT, &lock)) {
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LOGE("%s: GENLOCK_IOC_EXPORT failed (error=%s)", __FUNCTION__,
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strerror(errno));
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close_genlock_fd_and_handle(fd, lock.fd);
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ret = GENLOCK_FAILURE;
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}
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}
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// Store the lock params in the handle.
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hnd->genlockPrivFd = fd;
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hnd->genlockHandle = lock.fd;
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} else {
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hnd->genlockHandle = 0;
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}
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#else
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hnd->genlockHandle = 0;
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#endif
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return ret;
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}
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/*
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* Release a genlock lock associated with the handle.
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*
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* @param: handle of the buffer
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* @return error status.
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*/
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genlock_status_t genlock_release_lock(native_handle_t *buffer_handle)
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{
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genlock_status_t ret = GENLOCK_NO_ERROR;
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#ifdef USE_GENLOCK
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if (private_handle_t::validate(buffer_handle)) {
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LOGE("%s: handle is invalid", __FUNCTION__);
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return GENLOCK_FAILURE;
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}
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private_handle_t *hnd = reinterpret_cast<private_handle_t*>(buffer_handle);
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if ((hnd->flags & private_handle_t::PRIV_FLAGS_UNSYNCHRONIZED) == 0) {
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if (hnd->genlockPrivFd < 0) {
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LOGE("%s: the lock is invalid", __FUNCTION__);
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return GENLOCK_FAILURE;
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}
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// Close the fd and reset the parameters.
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close_genlock_fd_and_handle(hnd->genlockPrivFd, hnd->genlockHandle);
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}
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#endif
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return ret;
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}
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/*
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* Attach a lock to the buffer handle passed via an IPC.
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*
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* @param: handle of the buffer
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* @return error status.
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*/
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genlock_status_t genlock_attach_lock(native_handle_t *buffer_handle)
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{
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genlock_status_t ret = GENLOCK_NO_ERROR;
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#ifdef USE_GENLOCK
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if (private_handle_t::validate(buffer_handle)) {
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LOGE("%s: handle is invalid", __FUNCTION__);
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return GENLOCK_FAILURE;
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}
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private_handle_t *hnd = reinterpret_cast<private_handle_t*>(buffer_handle);
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if ((hnd->flags & private_handle_t::PRIV_FLAGS_UNSYNCHRONIZED) == 0) {
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// Open the genlock device
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int fd = open(GENLOCK_DEVICE, O_RDWR);
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if (fd < 0) {
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LOGE("%s: open genlock device failed (err=%s)", __FUNCTION__,
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strerror(errno));
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return GENLOCK_FAILURE;
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}
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// Attach the local handle to an existing lock
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genlock_lock lock;
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lock.fd = hnd->genlockHandle;
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if (ioctl(fd, GENLOCK_IOC_ATTACH, &lock)) {
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LOGE("%s: GENLOCK_IOC_ATTACH failed (err=%s)", __FUNCTION__,
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strerror(errno));
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close_genlock_fd_and_handle(fd, lock.fd);
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ret = GENLOCK_FAILURE;
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}
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// Store the relavant information in the handle
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hnd->genlockPrivFd = fd;
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}
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#endif
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return ret;
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}
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/*
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* Lock the buffer specified by the buffer handle. The lock held by the buffer
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* is specified by the lockType. This function will block if a write lock is
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* requested on the buffer which has previously been locked for a read or write
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* operation. A buffer can be locked by multiple clients for read. An optional
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* timeout value can be specified. By default, there is no timeout.
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*
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* @param: handle of the buffer
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* @param: type of lock to be acquired by the buffer.
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* @param: timeout value in ms. GENLOCK_MAX_TIMEOUT is the maximum timeout value.
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* @return error status.
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*/
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genlock_status_t genlock_lock_buffer(native_handle_t *buffer_handle,
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genlock_lock_type_t lockType,
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int timeout)
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{
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genlock_status_t ret = GENLOCK_NO_ERROR;
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#ifdef USE_GENLOCK
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// Translate the locktype
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int kLockType = get_kernel_lock_type(lockType);
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if (-1 == kLockType) {
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LOGE("%s: invalid lockType", __FUNCTION__);
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return GENLOCK_FAILURE;
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}
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if (0 == timeout) {
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LOGW("%s: trying to lock a buffer with timeout = 0", __FUNCTION__);
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}
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// Call the private function to perform the lock operation specified.
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ret = perform_lock_unlock_operation(buffer_handle, kLockType, timeout);
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#endif
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return ret;
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}
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/*
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* Unlocks a buffer that has previously been locked by the client.
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*
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* @param: handle of the buffer to be unlocked.
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* @return: error status.
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*/
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genlock_status_t genlock_unlock_buffer(native_handle_t *buffer_handle)
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{
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genlock_status_t ret = GENLOCK_NO_ERROR;
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#ifdef USE_GENLOCK
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// Do the unlock operation by setting the unlock flag. Timeout is always
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// 0 in this case.
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ret = perform_lock_unlock_operation(buffer_handle, GENLOCK_UNLOCK, 0);
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#endif
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return ret;
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}
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/*
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* Blocks the calling process until the lock held on the handle is unlocked.
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*
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* @param: handle of the buffer
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* @param: timeout value for the wait.
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* return: error status.
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*/
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genlock_status_t genlock_wait(native_handle_t *buffer_handle, int timeout) {
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#ifdef USE_GENLOCK
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if (private_handle_t::validate(buffer_handle)) {
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LOGE("%s: handle is invalid", __FUNCTION__);
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return GENLOCK_FAILURE;
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}
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private_handle_t *hnd = reinterpret_cast<private_handle_t*>(buffer_handle);
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if ((hnd->flags & private_handle_t::PRIV_FLAGS_UNSYNCHRONIZED) == 0) {
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if (hnd->genlockPrivFd < 0) {
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LOGE("%s: the lock is invalid", __FUNCTION__);
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return GENLOCK_FAILURE;
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}
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if (0 == timeout)
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LOGW("%s: timeout = 0", __FUNCTION__);
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genlock_lock lock;
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lock.fd = hnd->genlockHandle;
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lock.timeout = timeout;
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if (ioctl(hnd->genlockPrivFd, GENLOCK_IOC_WAIT, &lock)) {
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LOGE("%s: GENLOCK_IOC_WAIT failed (err=%s)", __FUNCTION__, strerror(errno));
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return GENLOCK_FAILURE;
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}
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}
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#endif
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return GENLOCK_NO_ERROR;
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}
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