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126 lines
3.9 KiB
126 lines
3.9 KiB
// Copyright 2016 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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#include "goldfish_dma.h"
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#include <qemu_pipe_bp.h>
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#if PLATFORM_SDK_VERSION < 26
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#include <cutils/log.h>
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#else
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#include <log/log.h>
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#endif
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#include <errno.h>
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#ifdef __ANDROID__
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#include <linux/ioctl.h>
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#include <linux/types.h>
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#include <sys/cdefs.h>
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#endif
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#include <sys/ioctl.h>
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#include <sys/mman.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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/* There is an ioctl associated with goldfish dma driver.
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* Make it conflict with ioctls that are not likely to be used
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* in the emulator.
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* 'G' 00-3F drivers/misc/sgi-gru/grulib.h conflict!
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* 'G' 00-0F linux/gigaset_dev.h conflict!
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*/
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#define GOLDFISH_DMA_IOC_MAGIC 'G'
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#define GOLDFISH_DMA_IOC_LOCK _IOWR(GOLDFISH_DMA_IOC_MAGIC, 0, struct goldfish_dma_ioctl_info)
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#define GOLDFISH_DMA_IOC_UNLOCK _IOWR(GOLDFISH_DMA_IOC_MAGIC, 1, struct goldfish_dma_ioctl_info)
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#define GOLDFISH_DMA_IOC_GETOFF _IOWR(GOLDFISH_DMA_IOC_MAGIC, 2, struct goldfish_dma_ioctl_info)
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#define GOLDFISH_DMA_IOC_CREATE_REGION _IOWR(GOLDFISH_DMA_IOC_MAGIC, 3, struct goldfish_dma_ioctl_info)
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struct goldfish_dma_ioctl_info {
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uint64_t phys_begin;
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uint64_t size;
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};
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int goldfish_dma_create_region(uint32_t sz, struct goldfish_dma_context* res) {
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res->fd = qemu_pipe_open("opengles");
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res->mapped_addr = 0;
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res->size = 0;
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if (res->fd > 0) {
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// now alloc
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struct goldfish_dma_ioctl_info info;
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info.size = sz;
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int alloc_res = ioctl(res->fd, GOLDFISH_DMA_IOC_CREATE_REGION, &info);
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if (alloc_res) {
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ALOGE("%s: failed to allocate DMA region. errno=%d",
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__FUNCTION__, errno);
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close(res->fd);
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res->fd = -1;
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return alloc_res;
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}
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res->size = sz;
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ALOGV("%s: successfully allocated goldfish DMA region with size %u cxt=%p fd=%d",
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__FUNCTION__, sz, res, res->fd);
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return 0;
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} else {
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ALOGE("%s: could not obtain fd to device! fd %d errno=%d\n",
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__FUNCTION__, res->fd, errno);
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return ENODEV;
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}
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}
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void* goldfish_dma_map(struct goldfish_dma_context* cxt) {
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ALOGV("%s: on fd %d errno=%d", __FUNCTION__, cxt->fd, errno);
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void *mapped = mmap(0, cxt->size, PROT_WRITE, MAP_SHARED, cxt->fd, 0);
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ALOGV("%s: cxt=%p mapped=%p size=%u errno=%d",
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__FUNCTION__, cxt, mapped, cxt->size, errno);
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if (mapped == MAP_FAILED) {
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mapped = NULL;
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}
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cxt->mapped_addr = reinterpret_cast<uint64_t>(mapped);
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return mapped;
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}
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int goldfish_dma_unmap(struct goldfish_dma_context* cxt) {
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ALOGV("%s: cxt=%p mapped=0x%" PRIu64, __FUNCTION__, cxt, cxt->mapped_addr);
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munmap(reinterpret_cast<void *>(cxt->mapped_addr), cxt->size);
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cxt->mapped_addr = 0;
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cxt->size = 0;
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return 0;
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}
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void goldfish_dma_write(struct goldfish_dma_context* cxt,
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const void* to_write,
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uint32_t sz) {
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ALOGV("%s: cxt=%p mapped=0x%" PRIu64 " to_write=%p size=%u",
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__FUNCTION__, cxt, cxt->mapped_addr, to_write, sz);
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memcpy(reinterpret_cast<void *>(cxt->mapped_addr), to_write, sz);
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}
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void goldfish_dma_free(goldfish_dma_context* cxt) {
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close(cxt->fd);
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}
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uint64_t goldfish_dma_guest_paddr(const struct goldfish_dma_context* cxt) {
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struct goldfish_dma_ioctl_info info;
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ioctl(cxt->fd, GOLDFISH_DMA_IOC_GETOFF, &info);
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return info.phys_begin;
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}
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