dma-buf: Update docs for SYNC ioctl Just a bit of wording polish plus mentioning that it can fail and must be restarted. Requested by Sumit. v2: Fix them typos (Hans). Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: Tiago Vignatti <tiago.vignatti@intel.com> Cc: Stéphane Marchesin ...
EDIT: Description has been rewritten as the initial test case was incorrect. Waypipe (package, workaround) relies on DMA_BUF_IOCTL_SYNC to check if a given file descripter is backed by DMABUF. On FreeBSD the ioctl always fails with EBADF...
(2) 流 DMA 映射(Streaming),通常针对一次 DMA 传输进行映射,在其之后立即取消映射(除非您使用下面的 dma_sync_*),并且硬件可以针对顺序访问进行优化将“流”视为“异步”或“在一致性域之外” (Think of "streaming" as "asynchronous" or "outside the coherency domain") 使用流映射的好例子是: 设备发送/...
[ 9.681284] drm_gem_map_dma_buf+0x5c/0xd4 [ 9.685381] __map_dma_buf+0x2c/0xa0 [ 9.688957] dma_buf_map_attachment+0xa0/0x130 [ 9.693402] dma_buf_ioctl+0x27c/0x650 [ 9.697152] __arm64_sys_ioctl+0xac/0xf0 [ 9.701077] invoke_syscall+0x48/0x114 [...
/ include / linux / dma-buf.h v6 v6.13 v6.12 v6.12.4 v6.12.3 v6.12.2 v6.12.1 v6.12 v6.12-rc7 v6.12-rc6 v6.12-rc5 v6.12-rc4 v6.12-rc3 v6.12-rc2 v6.12-rc1 v6.11 v6.10 v6.9 v6.8 v6.7 v6.6 v6.5 ...
(dmabuf->resv); 362 return ret; 363} 364 365static long dma_buf_ioctl(struct file *file, 366 unsigned int cmd, unsigned long arg) 367{ 368 struct dma_buf *dmabuf; 369 struct dma_buf_sync sync; 370 enum dma_data_direction direction; 371 int ret; 372 373 dmabuf = file->private...
sync_file.h> #include <linux/poll.h> #include <linux/dma-resv.h> #include <linux/mm.h> #include <linux/mount.h> #include <linux/pseudo_fs.h> #include #include #include "dma-buf-sysfs-stats.h" static inline int is_dma_buf_file(struct file *); #if IS_ENABLED(CONFIG_DEBUG_...
The ddi_dma_sync() function returns: DDI_SUCCESS Caches are successfully flushed. DDI_FAILURE The address range to be flushed is out of the address range established by ddi_dma_addr_bind_handle(9F) or ddi_dma_buf_bind_handle(9F). Context The ddi_dma_sync() function can be called from...
int(*sync)(struct vm_area_struct *vma,unsigned long,size_t,unsigned int flags); 这个方法被msync系统调用以将一个脏的内存区段保存到存贮介质上。如果成功则返回值为0 ,如果有错,则返回一个负数。核心版本1.2让这个方法返回void,因为这个函数不被认为会失败。
int(*sync)(struct vm_area_struct *vma,unsigned long,size_t,unsigned int flags); 这个方法被msync系统调用以将一个脏的内存区段保存到存贮介质上。如果成功则返回值为0 ,如果有错,则返回一个负数。核心版本1.2让这个方法返回void,因为这个函数不被认为会失败。