谁有关于PCI-E 中断部分MSI的相关资料

emmoblin

小弟最近在看PCI-E的千兆网卡驱动，但是对于MSI或者MSI-X部分总是不太理解。所以不得不寻求帮助了。
有没有详细讲述MSI中断相关寄存器配置的文章？谢谢了

dreamice

贴两个PCI的协议规范吧，准备研究中……

[ 本帖最后由 dreamice 于 2008-11-19 13:13 编辑 ]

dreamice

这个可能得看数据手册来定义。

eRicBIN

在PCI规范里有讲

对于驱动来说，MSI和INTx没有区别

albcamus

原帖由 eRicBIN 于 2008-11-19 13:00 发表
在PCI规范里有讲

对于驱动来说，MSI和INTx没有区别

Yes, MSI and MSI-X are defined in PCI Conventional spec 3.0

For PCI, both of them are optional; for PCI-E, at least one of them must be implemented.  Because MSI has a potential weakness (PVM : Per-Vector masting is optional), most PCI-E devices implements MSI-X directly.

The device vendor can implement both MSI and MSI-X for their device/function, but for the system software(OS kernel, driver), at most one of them can be enabled at the same time.

PCI-E spec 1.1 or 2.0 doesn't talk a lot about MSI/MSI-X, because they are already defined in PCI 3.0

>>对于驱动来说，MSI和INTx没有区别
Not true.  Driver should used MSI/MSI-X instead of INT<X> to improve performance.  Let's take an example, legacy INT<X> might be shared with other devices/functions, so, on the interrupt the OS will call every handler of this interrupt line to handle it.  It's slow, and to some extent, ineffective.

As for MSI/MSI-X, the interrupts are not shared between functions.  The device write a MSI/MSI-X message directly to the FSB,  even without bothering IO-APIC!  Apparently it's a better choice.

*I'm not able to input Chinese words now*.

leedesu

看完收益菲浅,, 回头马上试验去

garyv

学习一下pci-e

accessory

学习下

anders0913

原帖由 dreamice 于 2008-11-13 18:38 发表
贴两个PCI的协议规范吧，准备研究中……

大赞~~