linux-kernel - Re: [Intel-gfx] [PATCH 4/6] drm/i915: use vmap in i915_gem_object

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Message-ID: <1a421e7f-6255-c534-5403-715c2e809bd0@linux.intel.com>
Date:   Wed, 23 Sep 2020 14:58:43 +0100
From:   Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>
To:     Christoph Hellwig <hch@....de>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Juergen Gross <jgross@...e.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        linux-mm@...ck.org, Peter Zijlstra <peterz@...radead.org>,
        intel-gfx@...ts.freedesktop.org, x86@...nel.org,
        linux-kernel@...r.kernel.org, Minchan Kim <minchan@...nel.org>,
        dri-devel@...ts.freedesktop.org, xen-devel@...ts.xenproject.org,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Nitin Gupta <ngupta@...are.org>
Subject: Re: [Intel-gfx] [PATCH 4/6] drm/i915: use vmap in i915_gem_object_map


On 23/09/2020 14:41, Christoph Hellwig wrote:
> On Wed, Sep 23, 2020 at 10:52:33AM +0100, Tvrtko Ursulin wrote:
>>
>> On 18/09/2020 17:37, Christoph Hellwig wrote:
>>> i915_gem_object_map implements fairly low-level vmap functionality in
>>> a driver.  Split it into two helpers, one for remapping kernel memory
>>> which can use vmap, and one for I/O memory that uses vmap_pfn.
>>>
>>> The only practical difference is that alloc_vm_area prefeaults the
>>> vmalloc area PTEs, which doesn't seem to be required here for the
>>> kernel memory case (and could be added to vmap using a flag if actually
>>> required).
>>
>> Patch looks good to me.
>>
>> Series did not get a CI run from our side because of a different base so I
>> don't know if you would like to have a run there? If so you would need to
>> rebase against git://anongit.freedesktop.org/drm-tip drm-tip and you could
>> even send a series to intel-gfx-trybot@...ts.freedesktop.org, suppressing
>> cc, to check it out without sending a copy to the real mailing list.
> 
> It doesn't seem like I can post to any freedesktop list, as I always
> get rejection messages.  But I'll happily prepare a branch if one
> of you an feed it into your CI.

That's fine, just ping me and I will forward it for testing, thanks!

Regards,

Tvrtko