linux-kernel - Re: [PATCH RFC v2 12/29] PCI/MSI: Introduce pcim_enable

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Date:	Thu, 24 Oct 2013 11:51:58 +0100
From:	Tejun Heo <tj@...nel.org>
To:	Alexander Gordeev <agordeev@...hat.com>
Cc:	linux-kernel@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>,
	Michael Ellerman <michael@...erman.id.au>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Ben Hutchings <bhutchings@...arflare.com>,
	David Laight <David.Laight@...LAB.COM>,
	Mark Lord <kernel@...rt.ca>, "H. Peter Anvin" <hpa@...or.com>,
	linux-pci@...r.kernel.org
Subject: Re: [PATCH RFC v2 12/29] PCI/MSI: Introduce pcim_enable_msi*()
 family helpers

Hello, Alexander.

On Fri, Oct 18, 2013 at 07:12:12PM +0200, Alexander Gordeev wrote:
> So i.e. the request loop described in the documentation...
> 
> 	int foo_driver_enable_msix(struct foo_adapter *adapter,
> 				   int nvec)
> 	{
> 		while (nvec >= FOO_DRIVER_MINIMUM_NVEC) {
> 			rc = pci_enable_msix(adapter->pdev,
> 					     adapter->msix_entries,
> 					     nvec);
> 			if (rc > 0)
> 				nvec = rc;
> 			else
> 				return rc;
> 		}
> 
> 		return -ENOSPC;
> 	}
> 
> ...would turn into a single helper call....
> 
> 	rc = pcim_enable_msix_range(adapter->pdev,
> 				    adapter->msix_entries,
> 				    nvec,
> 				    FOO_DRIVER_MINIMUM_NVEC);

I haven't looked into any details but, if the above works for most use
cases, it looks really good to me.

Thanks!

-- 
tejun
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