linux-kernel - Re: [v3,12/16] cxl: Add base builtin support

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Message-Id: <20141007230416.2040C14011E@ozlabs.org>
Date:	Wed,  8 Oct 2014 10:04:15 +1100 (EST)
From:	Michael Ellerman <mpe@...erman.id.au>
To:	Michael Neuling <mikey@...ling.org>, greg@...ah.com, arnd@...db.de,
	benh@...nel.crashing.org
Cc:	cbe-oss-dev@...ts.ozlabs.org, mikey@...ling.org,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	imunsie@...ibm.com, linux-kernel@...r.kernel.org,
	linuxppc-dev@...abs.org, jk@...abs.org, anton@...ba.org
Subject: Re: [v3,12/16] cxl: Add base builtin support

On Tue, 2014-07-10 at 10:48:18 UTC, Michael Neuling wrote:
> From: Ian Munsie <imunsie@....ibm.com>
> 
> This adds the base cxl support that needs to be build into the kernel to use
> cxl as a module. This is needed so that the cxl call backs from the core
> powerpc mm code always exist irrespective of if the cxl module is loaded or
> not. This is similar to how cell works with CONFIG_SPU_BASE.
> 
> This adds a cxl_slbia() call (similar to spu_flush_all_slbs()) which checks for
> the cxl module being loaded. If the modules is not loaded we return, otherwise
> we call into the cxl SLB invalidation code.
> 
> This also adds the cxl_ctx_in_use() function for use in the mm code to see if
> any cxl contexts are currently in use. This is used by the tlbie() to
> determine if it can do local TLB invalidations or not. This also adds get/put
> calls for the cxl driver module to refcount the active cxl contexts.

This last paragraph is no longer true.

cheers
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