linux-kernel - Re: [PATCH 6/8] drm/panthor: Introduce huge tmpfs mount point option

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Message-ID: <d3b927b9-ddcb-492a-a72c-d42abbb11cff@collabora.com>
Date: Tue, 30 Sep 2025 18:31:11 +0200
From: Loïc Molinari <loic.molinari@...labora.com>
To: Boris Brezillon <boris.brezillon@...labora.com>
Cc: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
 Jani Nikula <jani.nikula@...ux.intel.com>,
 Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
 Rodrigo Vivi <rodrigo.vivi@...el.com>, Tvrtko Ursulin
 <tursulin@...ulin.net>, Rob Herring <robh@...nel.org>,
 Steven Price <steven.price@....com>, Liviu Dudau <liviu.dudau@....com>,
 Melissa Wen <mwen@...lia.com>, Maíra Canal
 <mcanal@...lia.com>, Hugh Dickins <hughd@...gle.com>,
 Baolin Wang <baolin.wang@...ux.alibaba.com>,
 Andrew Morton <akpm@...ux-foundation.org>, Al Viro
 <viro@...iv.linux.org.uk>, Mikołaj Wasiak
 <mikolaj.wasiak@...el.com>, Christian Brauner <brauner@...nel.org>,
 Nitin Gote <nitin.r.gote@...el.com>, Andi Shyti
 <andi.shyti@...ux.intel.com>, linux-kernel@...r.kernel.org,
 dri-devel@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
 linux-mm@...ck.org, kernel@...labora.com
Subject: Re: [PATCH 6/8] drm/panthor: Introduce huge tmpfs mount point option

On 30/09/2025 12:34, Boris Brezillon wrote:
> On Mon, 29 Sep 2025 22:03:14 +0200
> Loïc Molinari <loic.molinari@...labora.com> wrote:
> 
>> diff --git a/drivers/gpu/drm/panthor/panthor_device.h b/drivers/gpu/drm/panthor/panthor_device.h
>> index 4fc7cf2aeed5..54ca61567426 100644
>> --- a/drivers/gpu/drm/panthor/panthor_device.h
>> +++ b/drivers/gpu/drm/panthor/panthor_device.h
>> @@ -135,6 +135,9 @@ struct panthor_device {
>>   	/** @devfreq: Device frequency scaling management data. */
>>   	struct panthor_devfreq *devfreq;
>>   
>> +	/** @huge_mnt: tmpfs mount point with Transparent Hugepage enabled. */
>> +	struct vfsmount *huge_mnt;
> 
> Now that we have a helper to create a huge mountpoint, wouldn't it
> make sense to have this field in drm_device instead of having each
> driver add a huge_mnt field to their <driver>_device object.

Not sure this should be enforced for all DRM drivers since most of them 
don't create separate huge mountpoints (only 4 for now including this 
patchset) and I guess some maintainers might prefer to depend on the 
sysfs interace to enable huge pages.

>> +
>>   	/** @unplug: Device unplug related fields. */
>>   	struct {
>>   		/** @lock: Lock used to serialize unplug operations. */
> 

Loïc