| /* |
| * Copyright (c) 2011, Code Aurora Forum. All rights reserved. |
| |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following |
| * disclaimer in the documentation and/or other materials provided |
| * with the distribution. |
| * * Neither the name of Code Aurora Forum, Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived |
| * from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS |
| * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR |
| * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
| * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE |
| * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN |
| * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| #include <unistd.h> |
| #include <fcntl.h> |
| #include <sys/mman.h> |
| #include <stdlib.h> |
| #include <cutils/log.h> |
| #include <linux/ashmem.h> |
| #include <cutils/ashmem.h> |
| #include <errno.h> |
| #include "ashmemalloc.h" |
| |
| using gralloc::AshmemAlloc; |
| int AshmemAlloc::alloc_buffer(alloc_data& data) |
| { |
| int err = 0; |
| int fd = -1; |
| void* base = 0; |
| int offset = 0; |
| char name[ASHMEM_NAME_LEN]; |
| snprintf(name, ASHMEM_NAME_LEN, "gralloc-buffer-%x", data.pHandle); |
| int prot = PROT_READ | PROT_WRITE; |
| fd = ashmem_create_region(name, data.size); |
| if (fd < 0) { |
| ALOGE("couldn't create ashmem (%s)", strerror(errno)); |
| err = -errno; |
| } else { |
| if (ashmem_set_prot_region(fd, prot) < 0) { |
| ALOGE("ashmem_set_prot_region(fd=%d, prot=%x) failed (%s)", |
| fd, prot, strerror(errno)); |
| close(fd); |
| err = -errno; |
| } else { |
| base = mmap(0, data.size, prot, MAP_SHARED|MAP_POPULATE|MAP_LOCKED, fd, 0); |
| if (base == MAP_FAILED) { |
| ALOGE("alloc mmap(fd=%d, size=%d, prot=%x) failed (%s)", |
| fd, data.size, prot, strerror(errno)); |
| close(fd); |
| err = -errno; |
| } else { |
| memset((char*)base + offset, 0, data.size); |
| } |
| } |
| } |
| if(err == 0) { |
| data.fd = fd; |
| data.base = base; |
| data.offset = offset; |
| clean_buffer(base, data.size, offset, fd); |
| ALOGD("ashmem: Allocated buffer base:%p size:%d fd:%d", |
| base, data.size, fd); |
| |
| } |
| return err; |
| |
| } |
| |
| int AshmemAlloc::free_buffer(void* base, size_t size, int offset, int fd) |
| { |
| ALOGD("ashmem: Freeing buffer base:%p size:%d fd:%d", |
| base, size, fd); |
| int err = 0; |
| |
| if(!base) { |
| ALOGE("Invalid free"); |
| return -EINVAL; |
| } |
| err = unmap_buffer(base, size, offset); |
| close(fd); |
| return err; |
| } |
| |
| int AshmemAlloc::map_buffer(void **pBase, size_t size, int offset, int fd) |
| { |
| int err = 0; |
| void *base = 0; |
| |
| base = mmap(0, size, PROT_READ| PROT_WRITE, |
| MAP_SHARED|MAP_POPULATE, fd, 0); |
| *pBase = base; |
| if(base == MAP_FAILED) { |
| ALOGE("ashmem: Failed to map memory in the client: %s", |
| strerror(errno)); |
| err = -errno; |
| } else { |
| ALOGD("ashmem: Mapped buffer base:%p size:%d fd:%d", |
| base, size, fd); |
| } |
| return err; |
| } |
| |
| int AshmemAlloc::unmap_buffer(void *base, size_t size, int offset) |
| { |
| ALOGD("ashmem: Unmapping buffer base: %p size: %d", base, size); |
| int err = munmap(base, size); |
| if(err) { |
| ALOGE("ashmem: Failed to unmap memory at %p: %s", |
| base, strerror(errno)); |
| } |
| return err; |
| |
| } |
| int AshmemAlloc::clean_buffer(void *base, size_t size, int offset, int fd) |
| { |
| int err = 0; |
| if (ioctl(fd, ASHMEM_CACHE_FLUSH_RANGE, NULL)) { |
| ALOGE("ashmem: ASHMEM_CACHE_FLUSH_RANGE failed fd = %d", fd); |
| } |
| |
| return err; |
| } |
| |