/*
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* Copyright 2018 Rockchip Electronics Co. LTD
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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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#include <stdio.h>
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#include <sys/mman.h>
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#include "mpp_mem.h"
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#include "mpp_debug.h"
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#include "allocator_ext_dma.h"
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typedef struct {
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size_t alignment;
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} allocator_ctx;
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static MPP_RET allocator_ext_dma_open(void **ctx, MppAllocatorCfg *cfg)
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{
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MPP_RET ret = MPP_OK;
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allocator_ctx *p = NULL;
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if (NULL == ctx) {
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mpp_err_f("do not accept NULL input\n");
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return MPP_ERR_NULL_PTR;
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}
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p = mpp_malloc(allocator_ctx, 1);
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if (NULL == p) {
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mpp_err_f("failed to allocate context\n");
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ret = MPP_ERR_MALLOC;
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} else {
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p->alignment = cfg->alignment;
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}
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*ctx = p;
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return ret;
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}
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static MPP_RET allocator_ext_dma_alloc(void *ctx, MppBufferInfo *info)
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{
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if (!ctx || !info) {
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mpp_err_f("found NULL context input\n");
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return MPP_ERR_VALUE;
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}
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return MPP_ERR_PERM;
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}
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static MPP_RET allocator_ext_dma_free(void *ctx, MppBufferInfo *info)
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{
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if (!ctx || !info) {
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mpp_err_f("found NULL context input\n");
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return MPP_ERR_VALUE;
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}
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return MPP_ERR_PERM;
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}
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static MPP_RET allocator_ext_dma_import(void *ctx, MppBufferInfo *info)
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{
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allocator_ctx *p = (allocator_ctx *)ctx;
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mpp_assert(p);
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mpp_assert(info->size);
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if (info->ptr) {
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mpp_err_f("The ext_dma is not used for userptr\n");
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return MPP_ERR_VALUE;
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}
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return ((info->fd < 0) ? MPP_ERR_VALUE : MPP_OK);
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}
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static MPP_RET allocator_ext_dma_mmap(void *ctx, MppBufferInfo *info)
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{
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void *ptr = NULL;
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unsigned long offset = 0L;
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mpp_assert(ctx);
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mpp_assert(info->size);
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mpp_assert(info->fd >= 0);
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if (info->ptr)
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return MPP_OK;
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/*
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* It is insecure to access the first memory page,
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* usually system doesn't allow this behavior.
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*/
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ptr = mmap(NULL, info->size, PROT_READ | PROT_WRITE,
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MAP_SHARED, info->fd, offset);
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if (ptr == MAP_FAILED)
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return MPP_ERR_NULL_PTR;
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info->ptr = ptr;
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return MPP_OK;
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}
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static MPP_RET allocator_ext_dma_release(void *ctx, MppBufferInfo *info)
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{
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mpp_assert(ctx);
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mpp_assert(info->size);
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if (info->ptr)
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munmap(info->ptr, info->size);
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info->ptr = NULL;
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info->hnd = NULL;
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info->fd = -1;
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info->size = 0;
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return MPP_OK;
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}
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static MPP_RET allocator_ext_dma_close(void *ctx)
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{
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if (ctx) {
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mpp_free(ctx);
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return MPP_OK;
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}
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mpp_err_f("found NULL context input\n");
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return MPP_ERR_VALUE;
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}
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os_allocator allocator_ext_dma = {
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.open = allocator_ext_dma_open,
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.close = allocator_ext_dma_close,
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.alloc = allocator_ext_dma_alloc,
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.free = allocator_ext_dma_free,
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.import = allocator_ext_dma_import,
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.release = allocator_ext_dma_release,
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.mmap = allocator_ext_dma_mmap,
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};
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