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From: Bjorn Helgaas <helgaas@kernel.org>
To: Sinan Kaya <okaya@codeaurora.org>
Cc: linux-pci@vger.kernel.org, sulrich@codeaurora.org,
	timur@codeaurora.org,
	Mike Marciniszyn <mike.marciniszyn@intel.com>,
	"open list:HFI1 DRIVER" <linux-rdma@vger.kernel.org>,
	linux-arm-msm@vger.kernel.org,
	Dennis Dalessandro <dennis.dalessandro@intel.com>,
	open list <linux-kernel@vger.kernel.org>,
	Jason Gunthorpe <jgg@ziepe.ca>,
	Doug Ledford <dledford@redhat.com>,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 1/2] IB/hfi1: Try slot reset before secondary bus reset
Date: Tue, 19 Jun 2018 16:43:46 -0500	[thread overview]
Message-ID: <20180619214346.GD33049@bhelgaas-glaptop.roam.corp.google.com> (raw)
In-Reply-To: <1524167784-5911-1-git-send-email-okaya@codeaurora.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 <okaya@codeaurora.org>
> ---
>  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

  parent reply	other threads:[~2018-06-19 21:43 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-19 19:56 Sinan Kaya
2018-04-19 19:56 ` [PATCH 2/2] PCI/AER: " Sinan Kaya
2018-04-27 18:51   ` Sinan Kaya
2018-04-19 20:26 ` [PATCH 1/2] IB/hfi1: " Jason Gunthorpe
2018-04-19 20:35   ` Sinan Kaya
2018-04-19 21:47   ` Bjorn Helgaas
2018-04-19 22:11     ` Deucher, Alexander
2018-04-20 14:12       ` Dennis Dalessandro
2018-04-20 14:55       ` Jason Gunthorpe
2018-04-19 22:19     ` Sinan Kaya
2018-04-20 14:00       ` Bjorn Helgaas
2018-04-20 14:23         ` Sinan Kaya
2018-04-20 15:04         ` Alex Williamson
2018-04-23 17:28           ` Sinan Kaya
2018-04-23 19:10             ` Alex Williamson
2018-04-23 20:17               ` Sinan Kaya
2018-04-23 20:23               ` Bjorn Helgaas
2018-04-23 20:41                 ` Alex Williamson
2018-04-25 14:13               ` Sinan Kaya
2018-04-20 14:54     ` Jason Gunthorpe
2018-06-19 21:43 ` Bjorn Helgaas [this message]
2018-06-19 22:21   ` Sinan Kaya
2018-06-22 14:01     ` Bjorn Helgaas
2018-06-22 16:04       ` Sinan Kaya

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