Re: [PATCH v2] Force 4K pages for IO addresses.
flat view
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: 2008-03-18 20:32:37
On Tue, 2008-03-18 at 09:45 -0500, Nathan Lynch wrote:
Benjamin Herrenschmidt wrote:quoted
On Mon, 2008-03-17 at 19:34 -0500, Olof Johansson wrote:quoted
On Mon, Mar 17, 2008 at 02:54:19PM +1100, Tony Breeds wrote:quoted
Currently HEA requires 4K pages for IO resources. Just set the pages size to IO to 4K.Well, that's too bad. Why penalize all platforms for it? I.e.: Nack, we use 64K iopages on pa6t and it works well. No need to waste tlb and erat space.We would have to make that pSeries specific for now I suppose... We don't have a way to know that there "can" be an EHEA right ? It may not be in the device-tree at boot and dynamically added to the partition...The ibm,drc-names property of the root node should have "HEA" strings in it on systems where EHEA can potentially be present.
Ah good, I didn't know. That will force us to stick an ugly wart
somewhere to test it though, maybe we can just force mmu_ci_restrictions
to 1 ? Paul what do you think ?
Ben.