linux-kernel - Re: [Xen-devel] [PATCH v5 9/9] xen/pciback: Implement PCI reset slot or bus with 'do

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Date:	Thu, 4 Dec 2014 12:24:47 +0000
From:	David Vrabel <david.vrabel@...rix.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	David Vrabel <david.vrabel@...rix.com>
CC:	<bhelgaas@...gle.com>, <linux-pci@...r.kernel.org>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	<linux-kernel@...r.kernel.org>, <xen-devel@...ts.xenproject.org>
Subject: Re: [Xen-devel] [PATCH v5 9/9] xen/pciback: Implement PCI reset slot
 or bus with 'do_flr' SysFS attribute

On 04/12/14 12:06, Konrad Rzeszutek Wilk wrote:
> 
> On Dec 4, 2014 6:30 AM, David Vrabel <david.vrabel@...rix.com> wrote:
>>
>> On 03/12/14 21:40, Konrad Rzeszutek Wilk wrote: 
>>>
>>> Instead of doing all this complex dance, we depend on the toolstack 
>>> doing the right thing. As such implement the 'do_flr' SysFS attribute 
>>> which 'xl' uses when a device is detached or attached from/to a guest. 
>>> It bypasses the need to worry about the PCI lock. 
>>
>> No.  Get pciback to add its own "reset" sysfs file (as I have repeatedly 
>> proposed). 
>>
> 
> Which does not work as the kobj will complain (as there is already an 'reset' associated with the PCI device).

It is only needed if the core won't provide one.

+static int pcistub_try_create_reset_file(struct pci_dev *pci)
+{
+       struct xen_pcibk_dev_data *dev_data = pci_get_drvdata(pci);
+       struct device *dev = &pci->dev;
+       int ret;
+
+       /* Already have a per-function reset? */
+       if (pci_probe_reset_function(pci) == 0)
+               return 0;
+
+       ret = device_create_file(dev, &dev_attr_reset);
+       if (ret < 0)
+               return ret;
+       dev_data->created_reset_file = true;
+       return 0;
+}

David



View attachment "0002-xen-pciback-provide-a-reset-sysfs-file-to-try-harder.patch" of type "text/x-diff" (6660 bytes)