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Mon, 6 Oct 2025 09:34:49 +0200 (CEST) Date: Mon, 6 Oct 2025 09:34:46 +0200 From: Boris Brezillon To: =?UTF-8?B?TG/Dr2M=?= Molinari Cc: Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , Tvrtko Ursulin , Rob Herring , Steven Price , Liviu Dudau , Melissa Wen , =?UTF-8?B?TWHDrXJh?= Canal , Hugh Dickins , Baolin Wang , Andrew Morton , Al Viro , =?UTF-8?B?TWlrb8WCYWo=?= Wasiak , Christian Brauner , Nitin Gote , Andi Shyti , Christopher Healy , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, linux-mm@kvack.org, kernel@collabora.com Subject: Re: [PATCH v3 07/10] drm/panthor: Introduce huge tmpfs mount point option Message-ID: <20251006093446.2e1fd0a8@fedora> In-Reply-To: <20251004093054.21388-8-loic.molinari@collabora.com> References: <20251004093054.21388-1-loic.molinari@collabora.com> <20251004093054.21388-8-loic.molinari@collabora.com> Organization: Collabora X-Mailer: Claws Mail 4.3.1 (GTK 3.24.49; x86_64-redhat-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: A2E114000D X-Stat-Signature: or59195euyj5qfp8bqcfi4k3w116etjn X-Rspam-User: X-HE-Tag: 1759736092-183604 X-HE-Meta: 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 9AldnBaf NtihOZGki520En18smkI3CSTaXmi3+U/7bR5+HhJ2Oh0ehMJzM00tni5rPGbRFJvJeUhFDQftQFhkP/0E24s8TTeUmejNixa3WPlarhUZhO1begJe+H8xlEkUmQG5hawT5ilotUHdkS5RszqbqdDMpk6gjZXj78DECizccHHaxsUPHCCmRQYExMxweC5XgOoL622Mirko0LtyXjYXcmh3iRmwQGFF2yrzIwPfVDgB8OR+4WHxnoJYb21DeFmw32pQfhfzDV2hyX0MsGeXrTk+qIU8I7W3DbgbaBXUByZ3H7P2T5Zn03Zg8KAgiVBw1jNgtY8ClwFUxV2JBTd8lGJCFYWTWgisBuXigicshL0DbpKbCOOBTulVN6/SPSj2WkiFBbeRcyjDJUt3fBugCjvy8ZATZI+B35ZEhjrF X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Sat, 4 Oct 2025 11:30:50 +0200 Lo=C3=AFc Molinari wrote: > Introduce the 'panthor.transparent_hugepage' boolean module parameter > (false by default). When the parameter is set to true, a new tmpfs > mount point is created and mounted using the 'huge=3Dwithin_size' > option. It's then used at GEM object creation instead of the default > 'shm_mnt' mount point in order to enable Transparent Hugepage (THP) > for the object (without having to rely on a system wide parameter). >=20 > v3: > - use huge tmpfs mountpoint in drm_device >=20 > Signed-off-by: Lo=C3=AFc Molinari > --- > drivers/gpu/drm/panthor/panthor_device.c | 3 +++ > drivers/gpu/drm/panthor/panthor_drv.c | 7 +++++++ > drivers/gpu/drm/panthor/panthor_drv.h | 11 +++++++++++ > drivers/gpu/drm/panthor/panthor_gem.c | 19 +++++++++++++++++++ > drivers/gpu/drm/panthor/panthor_gem.h | 2 ++ > 5 files changed, 42 insertions(+) > create mode 100644 drivers/gpu/drm/panthor/panthor_drv.h >=20 > diff --git a/drivers/gpu/drm/panthor/panthor_device.c b/drivers/gpu/drm/p= anthor/panthor_device.c > index 81df49880bd8..3c0387156bb9 100644 > --- a/drivers/gpu/drm/panthor/panthor_device.c > +++ b/drivers/gpu/drm/panthor/panthor_device.c > @@ -17,6 +17,7 @@ > #include "panthor_devfreq.h" > #include "panthor_device.h" > #include "panthor_fw.h" > +#include "panthor_gem.h" > #include "panthor_gpu.h" > #include "panthor_hw.h" > #include "panthor_mmu.h" > @@ -269,6 +270,8 @@ int panthor_device_init(struct panthor_device *ptdev) > if (ret) > goto err_unplug_fw; > =20 > + panthor_gem_init(ptdev); > + > /* ~3 frames */ > pm_runtime_set_autosuspend_delay(ptdev->base.dev, 50); > pm_runtime_use_autosuspend(ptdev->base.dev); > diff --git a/drivers/gpu/drm/panthor/panthor_drv.c b/drivers/gpu/drm/pant= hor/panthor_drv.c > index fdbe89ef7f43..a2be3b904ca2 100644 > --- a/drivers/gpu/drm/panthor/panthor_drv.c > +++ b/drivers/gpu/drm/panthor/panthor_drv.c > @@ -1556,6 +1556,7 @@ static const struct file_operations panthor_drm_dri= ver_fops =3D { > .read =3D drm_read, > .llseek =3D noop_llseek, > .mmap =3D panthor_mmap, > + .get_unmapped_area =3D drm_gem_get_unmapped_area, > .show_fdinfo =3D drm_show_fdinfo, > .fop_flags =3D FOP_UNSIGNED_OFFSET, > }; > @@ -1623,6 +1624,12 @@ static const struct drm_driver panthor_drm_driver = =3D { > #endif > }; > =20 > +#ifdef CONFIG_TRANSPARENT_HUGEPAGE > +bool panthor_transparent_hugepage; > +module_param_named(transparent_hugepage, panthor_transparent_hugepage, b= ool, 0400); > +MODULE_PARM_DESC(transparent_hugepage, "Use a dedicated tmpfs mount poin= t with Transparent Hugepage enabled (false =3D default)"); > +#endif > + > static int panthor_probe(struct platform_device *pdev) > { > struct panthor_device *ptdev; > diff --git a/drivers/gpu/drm/panthor/panthor_drv.h b/drivers/gpu/drm/pant= hor/panthor_drv.h > new file mode 100644 > index 000000000000..27fe9b6f77bd > --- /dev/null > +++ b/drivers/gpu/drm/panthor/panthor_drv.h > @@ -0,0 +1,11 @@ > +// SPDX-License-Identifier: GPL-2.0 or MIT > +/* Copyright 2025 Amazon.com, Inc. or its affiliates */ > + > +#ifndef __PANTHOR_DRV_H__ > +#define __PANTHOR_DRV_H__ > + > +#ifdef CONFIG_TRANSPARENT_HUGEPAGE > +extern bool panthor_transparent_hugepage; > +#endif > + > +#endif > diff --git a/drivers/gpu/drm/panthor/panthor_gem.c b/drivers/gpu/drm/pant= hor/panthor_gem.c > index 156c7a0b62a2..49b7d288bfdf 100644 > --- a/drivers/gpu/drm/panthor/panthor_gem.c > +++ b/drivers/gpu/drm/panthor/panthor_gem.c > @@ -1,6 +1,7 @@ > // SPDX-License-Identifier: GPL-2.0 or MIT > /* Copyright 2019 Linaro, Ltd, Rob Herring */ > /* Copyright 2023 Collabora ltd. */ > +/* Copyright 2025 Amazon.com, Inc. or its affiliates */ > =20 > #include > #include > @@ -11,10 +12,28 @@ > #include > =20 > #include "panthor_device.h" > +#include "panthor_drv.h" > #include "panthor_fw.h" > #include "panthor_gem.h" > #include "panthor_mmu.h" > =20 > +void panthor_gem_init(struct panthor_device *ptdev) > +{ > + int err; > + > + if (!panthor_transparent_hugepage) > + return; > + > + err =3D drm_gem_huge_mnt_create(&ptdev->base, "within_size"); > + if (err && err !=3D -EEXIST) { > + drm_warn(&ptdev->base, "Can't use Transparent Hugepage (%d)\n", > + -err); > + return; > + } > + > + drm_info(&ptdev->base, "Using Transparent Hugepage\n"); if (err) drm_warn(&ptdev->base, "Can't use Transparent Hugepage (err=3D%d)\n", err= ); else drm_info(&ptdev->base, "Using Transparent Hugepage\n"); > +} > + > #ifdef CONFIG_DEBUG_FS > static void panthor_gem_debugfs_bo_init(struct panthor_gem_object *bo) > { > diff --git a/drivers/gpu/drm/panthor/panthor_gem.h b/drivers/gpu/drm/pant= hor/panthor_gem.h > index 80c6e24112d0..2eefe9104e5e 100644 > --- a/drivers/gpu/drm/panthor/panthor_gem.h > +++ b/drivers/gpu/drm/panthor/panthor_gem.h > @@ -136,6 +136,8 @@ struct panthor_gem_object *to_panthor_bo(struct drm_g= em_object *obj) > return container_of(to_drm_gem_shmem_obj(obj), struct panthor_gem_objec= t, base); > } > =20 > +void panthor_gem_init(struct panthor_device *ptdev); > + > struct drm_gem_object *panthor_gem_create_object(struct drm_device *ddev= , size_t size); > =20 > int