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145 lines
3.6 KiB
145 lines
3.6 KiB
#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <assert.h>
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#include <sys/mman.h>
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#include <sys/ioctl.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <linux/ion.h>
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#include <CL/cl_ext.h>
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#include <msm_ion.h>
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#include "visionbuf.h"
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// just hard-code these for convenience
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// size_t device_page_size = 0;
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// clGetDeviceInfo(device_id, CL_DEVICE_PAGE_SIZE_QCOM,
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// sizeof(device_page_size), &device_page_size,
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// NULL);
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// size_t padding_cl = 0;
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// clGetDeviceInfo(device_id, CL_DEVICE_EXT_MEM_PADDING_IN_BYTES_QCOM,
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// sizeof(padding_cl), &padding_cl,
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// NULL);
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#define DEVICE_PAGE_SIZE_CL 4096
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#define PADDING_CL 0
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static int ion_fd = -1;
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static void ion_init() {
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if (ion_fd == -1) {
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ion_fd = open("/dev/ion", O_RDWR | O_NONBLOCK);
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}
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}
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VisionBuf visionbuf_allocate(size_t len) {
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int err;
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ion_init();
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struct ion_allocation_data ion_alloc = {0};
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ion_alloc.len = len + PADDING_CL;
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ion_alloc.align = 4096;
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ion_alloc.heap_id_mask = 1 << ION_IOMMU_HEAP_ID;
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ion_alloc.flags = ION_FLAG_CACHED;
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err = ioctl(ion_fd, ION_IOC_ALLOC, &ion_alloc);
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assert(err == 0);
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struct ion_fd_data ion_fd_data = {0};
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ion_fd_data.handle = ion_alloc.handle;
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err = ioctl(ion_fd, ION_IOC_SHARE, &ion_fd_data);
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assert(err == 0);
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void *addr = mmap(NULL, ion_alloc.len,
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PROT_READ | PROT_WRITE,
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MAP_SHARED, ion_fd_data.fd, 0);
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assert(addr != MAP_FAILED);
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memset(addr, 0, ion_alloc.len);
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return (VisionBuf){
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.len = len,
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.mmap_len = ion_alloc.len,
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.addr = addr,
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.handle = ion_alloc.handle,
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.fd = ion_fd_data.fd,
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};
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}
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VisionBuf visionbuf_allocate_cl(size_t len, cl_device_id device_id, cl_context ctx) {
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VisionBuf buf = visionbuf_allocate(len);
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int err = 0;
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assert(((uintptr_t)buf.addr % DEVICE_PAGE_SIZE_CL) == 0);
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cl_mem_ion_host_ptr ion_cl = {0};
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ion_cl.ext_host_ptr.allocation_type = CL_MEM_ION_HOST_PTR_QCOM;
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ion_cl.ext_host_ptr.host_cache_policy = CL_MEM_HOST_UNCACHED_QCOM;
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ion_cl.ion_filedesc = buf.fd;
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ion_cl.ion_hostptr = buf.addr;
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buf.buf_cl = clCreateBuffer(ctx,
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CL_MEM_USE_HOST_PTR | CL_MEM_EXT_HOST_PTR_QCOM,
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buf.len, &ion_cl, &err);
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assert(err == 0);
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return buf;
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}
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void visionbuf_sync(const VisionBuf* buf, int dir) {
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int err;
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struct ion_fd_data fd_data = {0};
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fd_data.fd = buf->fd;
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err = ioctl(ion_fd, ION_IOC_IMPORT, &fd_data);
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assert(err == 0);
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struct ion_flush_data flush_data = {0};
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flush_data.handle = fd_data.handle;
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flush_data.vaddr = buf->addr;
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flush_data.offset = 0;
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flush_data.length = buf->len;
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// ION_IOC_INV_CACHES ~= DMA_FROM_DEVICE
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// ION_IOC_CLEAN_CACHES ~= DMA_TO_DEVICE
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// ION_IOC_CLEAN_INV_CACHES ~= DMA_BIDIRECTIONAL
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struct ion_custom_data custom_data = {0};
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switch (dir) {
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case VISIONBUF_SYNC_FROM_DEVICE:
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custom_data.cmd = ION_IOC_INV_CACHES;
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break;
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case VISIONBUF_SYNC_TO_DEVICE:
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custom_data.cmd = ION_IOC_CLEAN_CACHES;
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break;
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default:
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assert(0);
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}
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custom_data.arg = (unsigned long)&flush_data;
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err = ioctl(ion_fd, ION_IOC_CUSTOM, &custom_data);
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assert(err == 0);
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struct ion_handle_data handle_data = {0};
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handle_data.handle = fd_data.handle;
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err = ioctl(ion_fd, ION_IOC_FREE, &handle_data);
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assert(err == 0);
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}
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void visionbuf_free(const VisionBuf* buf) {
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clReleaseMemObject(buf->buf_cl);
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munmap(buf->addr, buf->mmap_len);
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close(buf->fd);
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struct ion_handle_data handle_data = {
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.handle = buf->handle,
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};
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int ret = ioctl(ion_fd, ION_IOC_FREE, &handle_data);
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assert(ret == 0);
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}
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