From 3d8b56d7b10e1ca972330d8892da3f3e9a6346f2 Mon Sep 17 00:00:00 2001 From: Yanteng Si Date: Thu, 25 Aug 2022 20:53:25 +0800 Subject: [PATCH] docs/zh_CN: Update the translation of io_ordering to 6.0-rc2 Update to commit d1ce350015d8 Documentation: ("Add io_ordering.rst to driver-api manual"). Move ../zh_CN/io_ordering.txt to ../zh_CN/driver-api/io_ordering.rst. Signed-off-by: Yanteng Si Reviewed-by: Wu XiangCheng Link: https://lore.kernel.org/r/c66f6d17c509c2c93f2afd30223c4bcf734f8317.1661431365.git.siyanteng@loongson.cn Signed-off-by: Jonathan Corbet --- .../translations/zh_CN/driver-api/index.rst | 2 +- .../zh_CN/driver-api/io_ordering.rst | 60 +++++++++++++++++ .../translations/zh_CN/io_ordering.txt | 67 ------------------- 3 files changed, 61 insertions(+), 68 deletions(-) create mode 100644 Documentation/translations/zh_CN/driver-api/io_ordering.rst delete mode 100644 Documentation/translations/zh_CN/io_ordering.txt diff --git a/Documentation/translations/zh_CN/driver-api/index.rst b/Documentation/translations/zh_CN/driver-api/index.rst index 24eb2198e5f1..ba354e1f4e6d 100644 --- a/Documentation/translations/zh_CN/driver-api/index.rst +++ b/Documentation/translations/zh_CN/driver-api/index.rst @@ -25,6 +25,7 @@ Linux驱动实现者的API指南 :maxdepth: 2 gpio/index + io_ordering Todolist: @@ -97,7 +98,6 @@ Todolist: * isa * isapnp * io-mapping -* io_ordering * generic-counter * memory-devices/index * men-chameleon-bus diff --git a/Documentation/translations/zh_CN/driver-api/io_ordering.rst b/Documentation/translations/zh_CN/driver-api/io_ordering.rst new file mode 100644 index 000000000000..4dbfa4ce92a0 --- /dev/null +++ b/Documentation/translations/zh_CN/driver-api/io_ordering.rst @@ -0,0 +1,60 @@ +.. SPDX-License-Identifier: GPL-2.0 + +.. include:: ../disclaimer-zh_CN.rst + +:Original: Documentation/driver-api/io_ordering.rst + +:翻译: + + 林永听 Lin Yongting + 司延腾 Yanteng Si + +:校译: + +=========================== +对内存映射地址的I/O写入排序 +=========================== + +在某些平台上,所谓的内存映射I/O是弱顺序。在这些平台上,驱动开发者有责任 +保证I/O内存映射地址的写操作按程序图意的顺序达到设备。通常读取一个“安全” +设备寄存器或桥寄存器,触发IO芯片清刷未处理的写操作到达设备后才处理读操作, +而达到保证目的。驱动程序通常在spinlock保护的临界区退出之前使用这种技术。 +这也可以保证后面的写操作只在前面的写操作之后到达设备(这非常类似于内存 +屏障操作,mb(),不过仅适用于I/O)。 + +假设一个设备驱动程的具体例子:: + + ... + CPU A: spin_lock_irqsave(&dev_lock, flags) + CPU A: val = readl(my_status); + CPU A: ... + CPU A: writel(newval, ring_ptr); + CPU A: spin_unlock_irqrestore(&dev_lock, flags) + ... + CPU B: spin_lock_irqsave(&dev_lock, flags) + CPU B: val = readl(my_status); + CPU B: ... + CPU B: writel(newval2, ring_ptr); + CPU B: spin_unlock_irqrestore(&dev_lock, flags) + ... + +上述例子中,设备可能会先接收到newval2的值,然后接收到newval的值,问题就 +发生了。不过很容易通过下面方法来修复:: + + ... + CPU A: spin_lock_irqsave(&dev_lock, flags) + CPU A: val = readl(my_status); + CPU A: ... + CPU A: writel(newval, ring_ptr); + CPU A: (void)readl(safe_register); /* 配置寄存器?*/ + CPU A: spin_unlock_irqrestore(&dev_lock, flags) + ... + CPU B: spin_lock_irqsave(&dev_lock, flags) + CPU B: val = readl(my_status); + CPU B: ... + CPU B: writel(newval2, ring_ptr); + CPU B: (void)readl(safe_register); /* 配置寄存器?*/ + CPU B: spin_unlock_irqrestore(&dev_lock, flags) + +在解决方案中,读取safe_register寄存器,触发IO芯片清刷未处理的写操作, +再处理后面的读操作,防止引发数据不一致问题。 diff --git a/Documentation/translations/zh_CN/io_ordering.txt b/Documentation/translations/zh_CN/io_ordering.txt deleted file mode 100644 index 7bb3086227ae..000000000000 --- a/Documentation/translations/zh_CN/io_ordering.txt +++ /dev/null @@ -1,67 +0,0 @@ -Chinese translated version of Documentation/driver-api/io_ordering.rst - -If you have any comment or update to the content, please contact the -original document maintainer directly. However, if you have a problem -communicating in English you can also ask the Chinese maintainer for -help. Contact the Chinese maintainer if this translation is outdated -or if there is a problem with the translation. - -Chinese maintainer: Lin Yongting ---------------------------------------------------------------------- -Documentation/driver-api/io_ordering.rst 的中文翻译 - -如果想评论或更新本文的内容,请直接联系原文档的维护者。如果你使用英文 -交流有困难的话,也可以向中文版维护者求助。如果本翻译更新不及时或者翻 -译存在问题,请联系中文版维护者。 - -中文版维护者: 林永听 Lin Yongting -中文版翻译者: 林永听 Lin Yongting -中文版校译者: 林永听 Lin Yongting - - -以下为正文 ---------------------------------------------------------------------- - -在某些平台上,所谓的内存映射I/O是弱顺序。在这些平台上,驱动开发者有责任 -保证I/O内存映射地址的写操作按程序图意的顺序达到设备。通常读取一个“安全” -设备寄存器或桥寄存器,触发IO芯片清刷未处理的写操作到达设备后才处理读操作, -而达到保证目的。驱动程序通常在spinlock保护的临界区退出之前使用这种技术。 -这也可以保证后面的写操作只在前面的写操作之后到达设备(这非常类似于内存 -屏障操作,mb(),不过仅适用于I/O)。 - -假设一个设备驱动程的具体例子: - - ... -CPU A: spin_lock_irqsave(&dev_lock, flags) -CPU A: val = readl(my_status); -CPU A: ... -CPU A: writel(newval, ring_ptr); -CPU A: spin_unlock_irqrestore(&dev_lock, flags) - ... -CPU B: spin_lock_irqsave(&dev_lock, flags) -CPU B: val = readl(my_status); -CPU B: ... -CPU B: writel(newval2, ring_ptr); -CPU B: spin_unlock_irqrestore(&dev_lock, flags) - ... - -上述例子中,设备可能会先接收到newval2的值,然后接收到newval的值,问题就 -发生了。不过很容易通过下面方法来修复: - - ... -CPU A: spin_lock_irqsave(&dev_lock, flags) -CPU A: val = readl(my_status); -CPU A: ... -CPU A: writel(newval, ring_ptr); -CPU A: (void)readl(safe_register); /* 配置寄存器?*/ -CPU A: spin_unlock_irqrestore(&dev_lock, flags) - ... -CPU B: spin_lock_irqsave(&dev_lock, flags) -CPU B: val = readl(my_status); -CPU B: ... -CPU B: writel(newval2, ring_ptr); -CPU B: (void)readl(safe_register); /* 配置寄存器?*/ -CPU B: spin_unlock_irqrestore(&dev_lock, flags) - -在解决方案中,读取safe_register寄存器,触发IO芯片清刷未处理的写操作, -再处理后面的读操作,防止引发数据不一致问题。