249 lines
6.9 KiB
C++
249 lines
6.9 KiB
C++
/*
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* Copyright (C) 2008 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define LOG_TAG "MemoryHeapPmem"
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#include <stdlib.h>
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#include <stdint.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/ioctl.h>
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#include <cutils/log.h>
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#include <binder/MemoryHeapPmem.h>
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#include <binder/MemoryHeapBase.h>
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#if HAVE_ANDROID_OS
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#include <linux/android_pmem.h>
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#endif
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namespace android {
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// ---------------------------------------------------------------------------
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MemoryHeapPmem::MemoryPmem::MemoryPmem(const sp<MemoryHeapPmem>& heap)
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: BnMemory(), mClientHeap(heap)
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{
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}
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MemoryHeapPmem::MemoryPmem::~MemoryPmem() {
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if (mClientHeap != NULL) {
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mClientHeap->remove(this);
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}
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}
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// ---------------------------------------------------------------------------
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class SubRegionMemory : public MemoryHeapPmem::MemoryPmem {
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public:
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SubRegionMemory(const sp<MemoryHeapPmem>& heap, ssize_t offset, size_t size);
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virtual ~SubRegionMemory();
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virtual sp<IMemoryHeap> getMemory(ssize_t* offset, size_t* size) const;
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private:
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friend class MemoryHeapPmem;
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void revoke();
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size_t mSize;
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ssize_t mOffset;
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};
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SubRegionMemory::SubRegionMemory(const sp<MemoryHeapPmem>& heap,
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ssize_t offset, size_t size)
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: MemoryHeapPmem::MemoryPmem(heap), mSize(size), mOffset(offset)
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{
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#ifndef NDEBUG
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void* const start_ptr = (void*)(intptr_t(getHeap()->base()) + offset);
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memset(start_ptr, 0xda, size);
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#endif
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#if HAVE_ANDROID_OS
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if (size > 0) {
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const size_t pagesize = getpagesize();
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size = (size + pagesize-1) & ~(pagesize-1);
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int our_fd = heap->heapID();
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struct pmem_region sub = { offset, size };
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int err = ioctl(our_fd, PMEM_MAP, &sub);
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LOGE_IF(err<0, "PMEM_MAP failed (%s), "
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"mFD=%d, sub.offset=%lu, sub.size=%lu",
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strerror(errno), our_fd, sub.offset, sub.len);
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}
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#endif
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}
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sp<IMemoryHeap> SubRegionMemory::getMemory(ssize_t* offset, size_t* size) const
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{
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if (offset) *offset = mOffset;
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if (size) *size = mSize;
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return getHeap();
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}
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SubRegionMemory::~SubRegionMemory()
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{
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revoke();
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}
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void SubRegionMemory::revoke()
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{
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// NOTE: revoke() doesn't need to be protected by a lock because it
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// can only be called from MemoryHeapPmem::revoke(), which means
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// that we can't be in ~SubRegionMemory(), or in ~SubRegionMemory(),
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// which means MemoryHeapPmem::revoke() wouldn't have been able to
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// promote() it.
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#if HAVE_ANDROID_OS
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if (mSize != 0) {
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const sp<MemoryHeapPmem>& heap(getHeap());
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int our_fd = heap->heapID();
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struct pmem_region sub;
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sub.offset = mOffset;
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sub.len = mSize;
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int err = ioctl(our_fd, PMEM_UNMAP, &sub);
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LOGE_IF(err<0, "PMEM_UNMAP failed (%s), "
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"mFD=%d, sub.offset=%lu, sub.size=%lu",
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strerror(errno), our_fd, sub.offset, sub.len);
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mSize = 0;
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}
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#endif
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}
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// ---------------------------------------------------------------------------
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MemoryHeapPmem::MemoryHeapPmem(const sp<MemoryHeapBase>& pmemHeap,
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uint32_t flags)
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: MemoryHeapBase()
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{
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char const * const device = pmemHeap->getDevice();
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#if HAVE_ANDROID_OS
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if (device) {
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int fd = open(device, O_RDWR | (flags & NO_CACHING ? O_SYNC : 0));
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LOGE_IF(fd<0, "couldn't open %s (%s)", device, strerror(errno));
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if (fd >= 0) {
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int err = ioctl(fd, PMEM_CONNECT, pmemHeap->heapID());
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if (err < 0) {
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LOGE("PMEM_CONNECT failed (%s), mFD=%d, sub-fd=%d",
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strerror(errno), fd, pmemHeap->heapID());
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close(fd);
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} else {
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// everything went well...
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mParentHeap = pmemHeap;
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MemoryHeapBase::init(fd,
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pmemHeap->getBase(),
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pmemHeap->getSize(),
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pmemHeap->getFlags() | flags,
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device);
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}
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}
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}
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#else
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mParentHeap = pmemHeap;
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MemoryHeapBase::init(
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dup(pmemHeap->heapID()),
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pmemHeap->getBase(),
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pmemHeap->getSize(),
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pmemHeap->getFlags() | flags,
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device);
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#endif
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}
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MemoryHeapPmem::~MemoryHeapPmem()
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{
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}
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sp<IMemory> MemoryHeapPmem::mapMemory(size_t offset, size_t size)
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{
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sp<MemoryPmem> memory = createMemory(offset, size);
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if (memory != 0) {
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Mutex::Autolock _l(mLock);
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mAllocations.add(memory);
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}
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return memory;
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}
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sp<MemoryHeapPmem::MemoryPmem> MemoryHeapPmem::createMemory(
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size_t offset, size_t size)
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{
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sp<SubRegionMemory> memory;
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if (heapID() > 0)
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memory = new SubRegionMemory(this, offset, size);
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return memory;
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}
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status_t MemoryHeapPmem::slap()
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{
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#if HAVE_ANDROID_OS
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size_t size = getSize();
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const size_t pagesize = getpagesize();
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size = (size + pagesize-1) & ~(pagesize-1);
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int our_fd = getHeapID();
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struct pmem_region sub = { 0, size };
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int err = ioctl(our_fd, PMEM_MAP, &sub);
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LOGE_IF(err<0, "PMEM_MAP failed (%s), "
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"mFD=%d, sub.offset=%lu, sub.size=%lu",
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strerror(errno), our_fd, sub.offset, sub.len);
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return -errno;
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#else
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return NO_ERROR;
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#endif
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}
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status_t MemoryHeapPmem::unslap()
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{
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#if HAVE_ANDROID_OS
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size_t size = getSize();
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const size_t pagesize = getpagesize();
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size = (size + pagesize-1) & ~(pagesize-1);
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int our_fd = getHeapID();
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struct pmem_region sub = { 0, size };
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int err = ioctl(our_fd, PMEM_UNMAP, &sub);
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LOGE_IF(err<0, "PMEM_UNMAP failed (%s), "
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"mFD=%d, sub.offset=%lu, sub.size=%lu",
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strerror(errno), our_fd, sub.offset, sub.len);
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return -errno;
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#else
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return NO_ERROR;
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#endif
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}
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void MemoryHeapPmem::revoke()
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{
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SortedVector< wp<MemoryPmem> > allocations;
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{ // scope for lock
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Mutex::Autolock _l(mLock);
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allocations = mAllocations;
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}
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ssize_t count = allocations.size();
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for (ssize_t i=0 ; i<count ; i++) {
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sp<MemoryPmem> memory(allocations[i].promote());
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if (memory != 0)
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memory->revoke();
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}
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}
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void MemoryHeapPmem::remove(const wp<MemoryPmem>& memory)
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{
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Mutex::Autolock _l(mLock);
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mAllocations.remove(memory);
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}
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// ---------------------------------------------------------------------------
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}; // namespace android
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