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Message-ID: <CABE8wwsrPg0br1hEK8eLYNNd+a0r5qsVkpRnVqpvPnz03_OELg@mail.gmail.com> Date: Mon, 23 Apr 2012 09:40:55 -0700 From: Dan Williams <dan.j.williams@...el.com> To: Jiang Liu <liuj97@...il.com> Cc: Vinod Koul <vinod.koul@...el.com>, Keping Chen <chenkeping@...wei.com>, linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH v1 0/8] enhance dmaengine core to support DMA device hotplug On Mon, Apr 23, 2012 at 6:51 AM, Jiang Liu <liuj97@...il.com> wrote: > From: Jiang Liu <liuj97@...il.com> > > 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? -- Dan -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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