From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bjorn Helgaas Subject: Re: [PATCH 1/2] IB/hfi1: Try slot reset before secondary bus reset Date: Tue, 19 Jun 2018 16:43:46 -0500 Message-ID: <20180619214346.GD33049@bhelgaas-glaptop.roam.corp.google.com> References: <1524167784-5911-1-git-send-email-okaya@codeaurora.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <1524167784-5911-1-git-send-email-okaya@codeaurora.org> Sender: linux-kernel-owner@vger.kernel.org To: Sinan Kaya Cc: linux-pci@vger.kernel.org, sulrich@codeaurora.org, timur@codeaurora.org, Mike Marciniszyn , "open list:HFI1 DRIVER" , linux-arm-msm@vger.kernel.org, Dennis Dalessandro , open list , Jason Gunthorpe , Doug Ledford , linux-arm-kernel@lists.infradead.org List-Id: linux-rdma@vger.kernel.org On Thu, Apr 19, 2018 at 03:56:23PM -0400, Sinan Kaya wrote: > The infiniband adapter might be connected to a PCI hotplug slot. Performing > secondary bus reset on a hotplug slot causes PCI link up/down interrupts. > > Hotplug driver removes the device from system when a link down interrupt > is observed and performs re-enumeration when link up interrupt is observed. > > This conflicts with what this code is trying to do. Try secondary bus reset > only if pci_reset_slot() fails/unsupported. Hi Sinan, We had a bunch of discussion here but not sure we ever reached a consensus. It did seem like we'd like to avoid putting hotplug knowledge in drivers, though. What do you think the path forward is? > Signed-off-by: Sinan Kaya > --- > drivers/infiniband/hw/hfi1/pcie.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/drivers/infiniband/hw/hfi1/pcie.c b/drivers/infiniband/hw/hfi1/pcie.c > index 83d66e8..75f49e3 100644 > --- a/drivers/infiniband/hw/hfi1/pcie.c > +++ b/drivers/infiniband/hw/hfi1/pcie.c > @@ -908,7 +908,8 @@ static int trigger_sbr(struct hfi1_devdata *dd) > * delay after a reset is required. Per spec requirements, > * the link is either working or not after that point. > */ > - pci_reset_bridge_secondary_bus(dev->bus->self); > + if (pci_reset_slot(dev->slot)) > + pci_reset_bridge_secondary_bus(dev->bus->self); > > return 0; > } > -- > 2.7.4 > > > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-kernel@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel