/* * Copyright (C) 2008 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "gralloc_priv.h" // we need this for now because pmem cannot mmap at an offset #define PMEM_HACK 1 /* desktop Linux needs a little help with gettid() */ #if defined(ARCH_X86) && !defined(HAVE_ANDROID_OS) #define __KERNEL__ # include pid_t gettid() { return syscall(__NR_gettid);} #undef __KERNEL__ #endif /*****************************************************************************/ static int gralloc_map(gralloc_module_t const* module, buffer_handle_t handle, void** vaddr) { private_handle_t* hnd = (private_handle_t*)handle; if (!(hnd->flags & private_handle_t::PRIV_FLAGS_FRAMEBUFFER)) { size_t size = hnd->size; #if PMEM_HACK size += hnd->offset; #endif void* mappedAddress = mmap(0, size, PROT_READ|PROT_WRITE, MAP_SHARED, hnd->fd, 0); if (mappedAddress == MAP_FAILED) { LOGE("Could not mmap handle %p, fd=%d (%s)", handle, hnd->fd, strerror(errno)); hnd->base = 0; return -errno; } hnd->base = intptr_t(mappedAddress) + hnd->offset; //LOGD("gralloc_map() succeeded fd=%d, off=%d, size=%d, vaddr=%p", // hnd->fd, hnd->offset, hnd->size, mappedAddress); } *vaddr = (void*)hnd->base; return 0; } static int gralloc_unmap(gralloc_module_t const* module, buffer_handle_t handle) { private_handle_t* hnd = (private_handle_t*)handle; if (!(hnd->flags & private_handle_t::PRIV_FLAGS_FRAMEBUFFER)) { void* base = (void*)hnd->base; size_t size = hnd->size; #if PMEM_HACK base = (void*)(intptr_t(base) - hnd->offset); size += hnd->offset; #endif //LOGD("unmapping from %p, size=%d, flags=%08x", base, size, hnd->flags); if (munmap(base, size) < 0) { LOGE("Could not unmap %s", strerror(errno)); } } hnd->base = 0; return 0; } /*****************************************************************************/ static pthread_mutex_t sMapLock = PTHREAD_MUTEX_INITIALIZER; /*****************************************************************************/ int gralloc_register_buffer(gralloc_module_t const* module, buffer_handle_t handle) { if (private_handle_t::validate(handle) < 0) return -EINVAL; // if this handle was created in this process, then we keep it as is. int err = 0; private_handle_t* hnd = (private_handle_t*)handle; if (hnd->pid != getpid()) { hnd->base = NULL; if (!(hnd->flags & private_handle_t::PRIV_FLAGS_USES_GPU)) { void *vaddr; err = gralloc_map(module, handle, &vaddr); } } return err; } int gralloc_unregister_buffer(gralloc_module_t const* module, buffer_handle_t handle) { if (private_handle_t::validate(handle) < 0) return -EINVAL; // never unmap buffers that were created in this process private_handle_t* hnd = (private_handle_t*)handle; if (hnd->pid != getpid()) { if (hnd->base) { gralloc_unmap(module, handle); } } return 0; } int mapBuffer(gralloc_module_t const* module, private_handle_t* hnd) { void* vaddr; return gralloc_map(module, hnd, &vaddr); } int terminateBuffer(gralloc_module_t const* module, private_handle_t* hnd) { if (hnd->base) { // this buffer was mapped, unmap it now if (hnd->flags & private_handle_t::PRIV_FLAGS_USES_PMEM) { if (hnd->pid != getpid()) { // ... unless it's a "master" pmem buffer, that is a buffer // mapped in the process it's been allocated. // (see gralloc_alloc_buffer()) gralloc_unmap(module, hnd); } } else if (hnd->flags & private_handle_t::PRIV_FLAGS_USES_GPU) { // XXX: for now do nothing here } else { gralloc_unmap(module, hnd); } } return 0; } int gralloc_lock(gralloc_module_t const* module, buffer_handle_t handle, int usage, int l, int t, int w, int h, void** vaddr) { // this is called when a buffer is being locked for software // access. in thin implementation we have nothing to do since // not synchronization with the h/w is needed. // typically this is used to wait for the h/w to finish with // this buffer if relevant. the data cache may need to be // flushed or invalidated depending on the usage bits and the // hardware. if (private_handle_t::validate(handle) < 0) return -EINVAL; private_handle_t* hnd = (private_handle_t*)handle; *vaddr = (void*)hnd->base; return 0; } int gralloc_unlock(gralloc_module_t const* module, buffer_handle_t handle) { // we're done with a software buffer. nothing to do in this // implementation. typically this is used to flush the data cache. if (private_handle_t::validate(handle) < 0) return -EINVAL; return 0; } /*****************************************************************************/ int gralloc_perform(struct gralloc_module_t const* module, int operation, ... ) { int res = -EINVAL; va_list args; va_start(args, operation); switch (operation) { case GRALLOC_MODULE_PERFORM_CREATE_HANDLE_FROM_BUFFER: { int fd = va_arg(args, int); size_t size = va_arg(args, size_t); size_t offset = va_arg(args, size_t); void* base = va_arg(args, void*); // validate that it's indeed a pmem buffer pmem_region region; if (ioctl(fd, PMEM_GET_SIZE, ®ion) < 0) { break; } native_handle_t** handle = va_arg(args, native_handle_t**); private_handle_t* hnd = (private_handle_t*)native_handle_create( private_handle_t::sNumFds, private_handle_t::sNumInts); hnd->magic = private_handle_t::sMagic; hnd->fd = fd; hnd->flags = private_handle_t::PRIV_FLAGS_USES_PMEM; hnd->size = size; hnd->offset = offset; hnd->base = intptr_t(base) + offset; *handle = (native_handle_t *)hnd; res = 0; break; } } va_end(args); return res; }