linux-kernel - Re: [PATCH v9 0/8] pci: add pci_iomap_wc() and pci_ioremap_wc

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Date:	Fri, 17 Jul 2015 22:29:23 +0200
From:	"Luis R. Rodriguez" <mcgrof@...e.com>
To:	"Luis R. Rodriguez" <mcgrof@...not-panic.com>
Cc:	mingo@...nel.org, bp@...e.de, arnd@...db.de, bhelgaas@...gle.com,
	luto@...capital.net, akpm@...ux-foundation.org,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	tomi.valkeinen@...com, mst@...hat.com, toshi.kani@...com,
	linux-fbdev@...r.kernel.org, xen-devel@...ts.xensource.com,
	benh@...nel.crashing.org
Subject: Re: [PATCH v9 0/8] pci: add pci_iomap_wc() and pci_ioremap_wc_bar()

On Wed, Jul 08, 2015 at 06:54:11PM -0700, Luis R. Rodriguez wrote:
> From: "Luis R. Rodriguez" <mcgrof@...e.com>
> 
> Ingo,
> 
> Boris is on vacation, he picked up these patches on his bp#tip-mm tree [0]
> and they have baked there for a while now. That tree receives 0-day
> bot testing, but other than that its not clear what other tests were
> run on these patches. Boris modified the commit logs a bit, and made one
> optimizaiton to bail early on an PCI ioremap call when it should. These
> patches have no modifications from what is on Boris' tree and tip-mm branch.
> 
> The 0 day build bot did find issues on Boris' tree but those are related
> to ioremap_uc() (already upstream) and its first use on atyfb (not
> upstream) -- I will be addressing a fix for that ioremap_uc() issue through
> another patch series prior to posting the final set for atyfb which makes
> use of ioremap_uc().
> 
> No issues have been found with this series. Benh did note some possible issues
> with expectations with what is done for write-combining for PowerPC [1] but
> the issue is a rather general long standing issue with semantics of ioremap --
> in the case for ioremap_wc() on PowerPC benh notes that writel() will never
> write-combine as it uses too heavy barriers. Benh notes that although
> writel_relaxed() today is identical to writel() this can be changed. There are
> other general semantics issues with ioremap() variant calls -- we seem to have
> all gotten together to discuss all these issues on a thread where Dan Williams
> is proposing to "unify ioremap prototypes and macro aliases" [1], folks
> intersted on these issues or semantic concerns can drop in and chime there.
> 
> Let me know if these are OK or if there are any questions.
> 
> [0] http://lkml.kernel.org/r/20150625204703.GC4898@pd.tnic
> [1] http://lkml.kernel.org/r/20150707095012.GQ7021@wotan.suse.de

Ingo,

Just a friendly reminder. Let me know if there are any issues or questions.

 Luis
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