linux-kernel - Re: [PATCH] drm/panthor: Support partial unmaps of huge pages

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Message-ID: <20251021180938.7a674618@fedora>
Date: Tue, 21 Oct 2025 18:09:38 +0200
From: Boris Brezillon <boris.brezillon@...labora.com>
To: Akash Goel <akash.goel@....com>
Cc: Adrián Larumbe <adrian.larumbe@...labora.com>,
 linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org, Steven Price
 <steven.price@....com>, kernel@...labora.com, Liviu Dudau
 <liviu.dudau@....com>, 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>
Subject: Re: [PATCH] drm/panthor: Support partial unmaps of huge pages

On Tue, 21 Oct 2025 15:32:45 +0100
Akash Goel <akash.goel@....com> wrote:

> On 10/19/25 04:19, Adrián Larumbe wrote:
> > Commit 33729a5fc0ca ("iommu/io-pgtable-arm: Remove split on unmap
> > behavior") did away with the treatment of partial unmaps of huge IOPTEs.
> >   
> 
> Sorry have a doubt.
> 
> Corresponding to the commit 33729a5fc0ca, can we now remove the code to 
> pre-allocate L3 page table pages i.e. 'op_ctx->rsvd_page_tables.pages' 
> inside panthor_vm_prepare_unmap_op_ctx() ?.

Well, not if we want to support partial unmaps of huge pages at a non-2M
boundary.