错误信息 ion_carveout_allocate(93) err: alloc 0x00153000 bytes failed 表明在尝试从ION carveout堆内存中分配 0x00153000(即大约910KB)字节的空间时失败了。ION carveout是一种内存管理机制,通常用于图形处理或需要物理连续内存的应用场景。这里的93可能表示某种内部标识或句柄,用于区分不同的ION heap或内存区域...
首先看看ion是怎么使用的: 1.打开驱动: mIonFd=open(ION_DEVICE,O_RDONLY); 2.ioctl 发送ION_IOC_ALLOC命令 if(ioctl(mIonFd,ION_IOC_ALLOC,&ionAllocData)){err=-errno;ALOGE("ION_IOC_ALLOC failed with error - %s",strerror(errno));returnerr;} 3.ioctl发送ION_IOC_MAP命令 ioctl(mIonFd,ION_IOC...
alloc.len = (alloc.len + 4095U) & (~4095U); alloc.align = 4096; if (cached) { alloc.flags = ION_FLAG_CACHED; } alloc.heap_id_mask = heap_id; rc =ioctl(main_ion_fd, ION_IOC_ALLOC, &alloc); if (rc < 0) { ALOGE("ION allocation failed: %s\n", strerror(errno)); goto ...
alloc.len = (alloc.len + 4095U) & (~4095U); alloc.align = 4096; if (cached) { alloc.flags = ION_FLAG_CACHED; } alloc.heap_id_mask = heap_id; rc =ioctl(main_ion_fd, ION_IOC_ALLOC, &alloc); if (rc < 0) { ALOGE("ION allocation failed: %s\n", strerror(errno)); goto ...
if (fd < 0) ALOGE("open /dev/ion failed: %s", strerror(errno)); return fd; } 1. 2. 3. 4. 5. Handle 在一个用户进程中最多有一个client。当有了一个client之后,就可以通过调用ion_alloc_fd→ion_alloc→ion_ioctl分配ion内存。其中需要注意的就是ion_allocation_data 结构体,分别指明内存的大...
ion_ioct函数有若⼲个cmd,ION_IOC_ALLOC和ION_IOC_FREE相对应,表⽰申请和释放buffer。⽤户空间程序使⽤前先要调⽤ION_IOC_MAP才能得到bufferaddress,⽽ION_IOC_IMPORT是为了将这块内存共享给⽤户空间另⼀个进程。[cpp]1.staticlongion_ioctl(structfile*filp,unsignedintcmd,unsignedlongarg)2.{3.4...
int err = ioctl(ion_fd, ION_IOC_ALLOC, &allocation_data); if (err) return 0; return allocation_data.handle; } int ION_share(ion_user_handle_t handle) { struct ion_fd_data fd_data; fd_data.handle = handle; int err = ioctl(ion_fd, ION_IOC_SHARE, &fd_data); ...
gralloc 除了做ion_alloc动作外,还会做ion_share。ion share driver会返回一个fd,这个fd 是一个dma buffer,保存在handle的shared_fd中。 经过ion_alloc和ion_share后,ion driver里这个ion buffer的ion_handle值为1, ref值为2。ref为2是因为,ion alloc时+1;ion share时+1。
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ALOGE("Failed to open ion device\n"); ret = ion_fd; goto out; } ret = ion_alloc(ion_fd, size, 0, (1 << ION_SYSTEM_HEAP_ID), ION_FLAG_CACHED, &ion_hdl); if(ret < 0) { ALOGE("Failed to allocate ion buffer\n"); ...