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Linux下DMA引擎框架4:Client 使用DMA引擎传输过程

  • 2026-01-26 00:17:20
Linux下DMA引擎框架4:Client 使用DMA引擎传输过程

一、 DMA使用基本步骤

1. 申请DMA从通道

struct dma_chan *chan = dma_request_chan(dev, "name");

通过设备树、ACPI或板级文件映射表获取指定设备的DMA通道

通道是独占的,直到调用dma_release_channel()释放

2. 配置从设备参数

struct dma_slave_config config = {    .direction = DMA_MEM_TO_DEV,    .dst_addr = peripheral_addr,    // 其他配置...};dmaengine_slave_config(chan, &config);

配置DMA方向、地址、总线宽度、突发长度等

3. 获取传输描述符

根据传输类型选择相应的准备函数:

散列表传输(scatter-gather)

struct dma_async_tx_descriptor *desc;desc = dmaengine_prep_slave_sg(chan, sgl, sg_len, direction, flags);

循环传输(cyclic)

 desc=dmaengine_prep_dma_cyclic(chan, buf_addr, buf_len, period_len, direction);

交错传输(interleaved)

 desc=dmaengine_prep_interleaved_dma(chan, &xt, flags);

重要注意事项

对于slave_sg,必须先映射散列表再调用准备函数

准备完成后可添加回调函数

准备和提交操作应紧密配对(中间可能有锁)

4. 可选:附加元数据

根据需求选择元数据模式:

客户端模式(DESC_METADATA_CLIENT)

// 准备数据并附加dmaengine_desc_attach_metadata(desc, metadata_buf, len);

引擎模式(DESC_METADATA_ENGINE)

// 获取引擎的元数据缓冲区void *meta = dmaengine_desc_get_metadata_ptr(desc, &payload, &max_len);// 设置数据长度dmaengine_desc_set_metadata_len(desc, len);

5. 提交传输

 dma_cookie_t cookie=dmaengine_submit(desc);

将描述符加入待处理队列

注意:提交后描述符指针归DMA引擎所有,客户端不应再使用

6. 启动传输

dma_async_issue_pending(chan);

激活待处理队列中的传输

传输完成后通过回调函数(如有设置)通知客户端

二 其他重要API:

终止传输

// 异步终止(可从原子上下文调用)dmaengine_terminate_async(chan);// 然后同步等待dmaengine_synchronize(chan);// 同步终止(不可从原子上下文调用)dmaengine_terminate_sync(chan);

暂停/恢复

dmaengine_pause(chan);    // 暂停传输dmaengine_resume(chan);   // 恢复传输

检查完成状态

 dma_async_is_tx_complete(chan, cookie, &last, &used);

以下是使用DMA引擎API进行数据传输的流程总结和流程图:

三、数据传输流程总结

主要步骤:

申请DMA通道-dma_request_chan()

配置从设备参数-dmaengine_slave_config()

准备传输描述符- 根据传输类型选择:

可选:设置元数据- 根据需要选择元数据模式

提交传输-dmaengine_submit()

启动传输并等待完成-dma_async_issue_pending()

关键注意事项:

传输描述符在dmaengine_submit()后会转移到DMA引擎,客户端不应再使用该指针

在准备slave_sg传输前需要先映射散射列表

异步传输的完成通过回调函数通知

提供多种传输终止方式,需根据上下文选择

四、数据传输流程图 带元数据

五、主要API函数说明

步骤API函数作用
通道申请dma_request_chan()申请独占的DMA通道
参数配置dmaengine_slave_config()配置DMA传输参数
描述符准备dmaengine_prep_slave_sg()准备散列表传输描述符
dmaengine_prep_dma_cyclic()准备循环传输描述符
dmaengine_prep_interleaved_dma()准备交错传输描述符
元数据操作dmaengine_desc_attach_metadata()附加客户端元数据
dmaengine_desc_get_metadata_ptr()获取引擎元数据指针
提交传输dmaengine_submit()提交传输到挂起队列
启动传输dma_async_issue_pending()启动挂起的传输
终止传输dmaengine_terminate_sync()同步终止传输
dmaengine_terminate_async()异步终止传输

六、时序图概览

以下是DMA客户端(使用者)与DMA引擎框架的完整交互时序图,展示了从初始化到传输完成的完整流程:

七、流程图概览

以下是更详细的时序流程图,包括多个传输场景和错误处理:

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  1. CONNECT:[ UseTime:0.000419s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000569s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000289s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.003297s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000719s ]
  6. SELECT * FROM `set` [ RunTime:0.001577s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000677s ]
  8. SELECT * FROM `article` WHERE `id` = 465939 LIMIT 1 [ RunTime:0.014580s ]
  9. UPDATE `article` SET `lasttime` = 1770507725 WHERE `id` = 465939 [ RunTime:0.000703s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000916s ]
  11. SELECT * FROM `article` WHERE `id` < 465939 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000450s ]
  12. SELECT * FROM `article` WHERE `id` > 465939 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.004311s ]
  13. SELECT * FROM `article` WHERE `id` < 465939 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.016925s ]
  14. SELECT * FROM `article` WHERE `id` < 465939 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.031523s ]
  15. SELECT * FROM `article` WHERE `id` < 465939 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.009129s ]
0.163535s