>On Mon, Apr 23, 2012 at 6:51 AM, Jiang Liu <liuj97@xxxxxxxxx> wrote: >> From: Jiang Liu <liuj97@xxxxxxxxx> >> >> This patchset tries to enhance the dmaengine and its clients to support >> hot-removal of DMA devices at runtime, especially for IOAT devices. >> >> When hot-removing IOH (PCI host bridge) on Intel Nehalem/Westmere platform, >> we need to remove all IOAT devices embedded in the IOH. For future Intel >> processor with IIO (Embedded IOH), we need to remove IOAT devices even >> when hot-removing a physical processor. But current dmaengine implementation >> doesn't support hot-removal of IOAT devices at runtime. > >Removal of the host bridge means several devices disappear at once. >Is it safe to assume that this action is coordinated by userspace? >I.e. is the kernel given a chance to shut everything down and remove >drivers, or is this a "surprise" unplug? Hi Dan, Sorry for late reply! I just noticed this mail by browsing the linux-pci mail list web archive just now. Yes, it will be coordinated by user/kernel hotplug manager. We don't plan to support surprisingly removal yet. It seems a little craze to support that. Thanks! Gerry -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
