100 lines
2.9 KiB
C++
100 lines
2.9 KiB
C++
/*
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* Copyright (C) 2016 Google, Inc.
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include "goldfish_dma.h"
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#include "qemu_pipe.h"
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#include <cutils/log.h>
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#include <sys/mman.h>
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#include <stdlib.h>
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#include <string.h>
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int goldfish_dma_lock(struct goldfish_dma_context* cxt) {
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struct goldfish_dma_ioctl_info info;
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return ioctl(cxt->fd, GOLDFISH_DMA_IOC_LOCK, &info);
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}
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int goldfish_dma_unlock(struct goldfish_dma_context* cxt) {
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struct goldfish_dma_ioctl_info info;
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return ioctl(cxt->fd, GOLDFISH_DMA_IOC_UNLOCK, &info);
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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 = NULL;
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res->sz = 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->sz = sz;
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ALOGV("%s: successfully allocated goldfish DMA region with size %lu cxt=%p",
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__FUNCTION__, sz, res);
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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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cxt->mapped = mmap(0, cxt->sz, PROT_WRITE, MAP_SHARED, cxt->fd, 0);
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ALOGV("%s: mapped addr=%p errno=%d", __FUNCTION__, cxt->mapped, errno);
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if (cxt->mapped == MAP_FAILED) {
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cxt->mapped = NULL;
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}
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return cxt->mapped;
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}
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int goldfish_dma_unmap(struct goldfish_dma_context* cxt) {
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munmap(cxt->mapped, cxt->sz);
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cxt->mapped = NULL;
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cxt->sz = 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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void* to_write,
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uint32_t sz) {
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ALOGV("%s: mapped addr=%p", __FUNCTION__, cxt->mapped);
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memcpy(cxt->mapped, to_write, sz);
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}
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void goldfish_dma_free(goldfish_dma_context* cxt) {
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struct goldfish_dma_ioctl_info info;
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close(cxt->fd);
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}
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uint64_t goldfish_dma_guest_paddr(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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