From mboxrd@z Thu Jan 1 00:00:00 1970 From: Konrad Rzeszutek Wilk Subject: [RFC PATCH] Xen PCI back - do slot and bus reset (v0). Date: Fri, 13 Dec 2013 11:09:33 -0500 Message-ID: <1386950978-8628-1-git-send-email-konrad.wilk__1676.70457526601$1386951119$gmane$org@oracle.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from mail6.bemta5.messagelabs.com ([195.245.231.135]) by lists.xen.org with esmtp (Exim 4.72) (envelope-from ) id 1VrVJQ-0000W5-Ph for xen-devel@lists.xenproject.org; Fri, 13 Dec 2013 16:10:00 +0000 List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org, gordan@bobich.net List-Id: xen-devel@lists.xenproject.org Hey, While I was trying to narrow down the state of GPU passthrough (still not finished) and figuring what needs to be done I realized that Xen PCIback did not reset my GPU properly (when I crashed the Windows guest by mistake). It does an FLR reset or Power one - if the device supports it. But it seems that some of these GPUs are liars and actually don't do the power part properly. One way to fix this is by doing a slot (aka device) and bus reset. Of course to do that - you need to make sure that all of the functions of a device are under the ownership of xen-pciback. Otherwise you might accidently reset your sound card while it is being used. These RFC patches cleanup pci back a bit and also make it possible for Xen pciback to do the whole gamma of 'reset' for PCI devices: FLR, power management, AER, slot and bus reset if neccessary. Thanks go to Gordan Bobic for educating me on how to "reprogram" and GFX460 in a Quardro 4000M and also reporting oddities when a PCI device was reset but it looked like it was not reset. drivers/xen/xen-pciback/pci_stub.c | 142 +++++++++++++++++++++++++++++++------ drivers/xen/xen-pciback/xenbus.c | 5 +- 2 files changed, 124 insertions(+), 23 deletions(-) Konrad Rzeszutek Wilk (5): xen-pciback: Cleanup up pcistub_put_pci_dev xen-pciback: First reset, then free. xen-pciback: Document when we FLR an PCI device. xen/pciback: Move the FLR code to a function. xen/pciback: PCI reset slot or bus