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author | Yanteng Si <siyanteng@loongson.cn> | 2022-08-25 15:53:25 +0300 |
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committer | Jonathan Corbet <corbet@lwn.net> | 2022-09-27 22:21:42 +0300 |
commit | 3d8b56d7b10e1ca972330d8892da3f3e9a6346f2 (patch) | |
tree | eb87baec2d707b11f42e7c09ab22abb6b0f1772d /Documentation/translations/zh_CN/io_ordering.txt | |
parent | 6cf3116d5eeda0284bbedb8610192df31f86cdf0 (diff) | |
download | linux-3d8b56d7b10e1ca972330d8892da3f3e9a6346f2.tar.xz |
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 <siyanteng@loongson.cn>
Reviewed-by: Wu XiangCheng <bobwxc@email.cn>
Link: https://lore.kernel.org/r/c66f6d17c509c2c93f2afd30223c4bcf734f8317.1661431365.git.siyanteng@loongson.cn
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Diffstat (limited to 'Documentation/translations/zh_CN/io_ordering.txt')
-rw-r--r-- | Documentation/translations/zh_CN/io_ordering.txt | 67 |
1 files changed, 0 insertions, 67 deletions
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 Contact the Chinese maintainer if this translation is outdated -or if there is a problem with the translation.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 <linyongting@gmail.com> ---------------------------------------------------------------------- -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 <linyongting@gmail.com> -中文版翻译者: 林永听 Lin Yongting <linyongting@gmail.com> -中文版校译者: 林永听 Lin Yongting <linyongting@gmail.com> - - -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。 |