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(unknown [IPv6:2a01:e0a:5e3:6100:826d:bc07:e98c:84a]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: loicmolinari) by bali.collaboradmins.com (Postfix) with ESMTPSA id 985E117E0AC3; Mon, 29 Sep 2025 22:04:49 +0200 (CEST) From: =?UTF-8?q?Lo=C3=AFc=20Molinari?= To: Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , Tvrtko Ursulin , Boris Brezillon , Rob Herring , Steven Price , Liviu Dudau , Melissa Wen , =?UTF-8?q?Ma=C3=ADra=20Canal?= , Hugh Dickins , Baolin Wang , Andrew Morton , =?UTF-8?q?Lo=C3=AFc=20Molinari?= , Al Viro , =?UTF-8?q?Miko=C5=82aj=20Wasiak?= , Christian Brauner , Nitin Gote , Andi Shyti Cc: linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, linux-mm@kvack.org, kernel@collabora.com Subject: [PATCH 6/8] drm/panthor: Introduce huge tmpfs mount point option Date: Mon, 29 Sep 2025 22:03:14 +0200 Message-ID: <20250929200316.18417-7-loic.molinari@collabora.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20250929200316.18417-1-loic.molinari@collabora.com> References: <20250929200316.18417-1-loic.molinari@collabora.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable 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). Signed-off-by: Lo=C3=AFc Molinari --- drivers/gpu/drm/panthor/panthor_device.c | 4 ++++ drivers/gpu/drm/panthor/panthor_device.h | 3 +++ drivers/gpu/drm/panthor/panthor_drv.c | 7 ++++++ drivers/gpu/drm/panthor/panthor_drv.h | 11 +++++++++ drivers/gpu/drm/panthor/panthor_gem.c | 30 +++++++++++++++++++++++- drivers/gpu/drm/panthor/panthor_gem.h | 3 +++ 6 files changed, 57 insertions(+), 1 deletion(-) create mode 100644 drivers/gpu/drm/panthor/panthor_drv.h diff --git a/drivers/gpu/drm/panthor/panthor_device.c b/drivers/gpu/drm/pan= thor/panthor_device.c index 81df49880bd8..4f254b574287 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" @@ -98,6 +99,7 @@ void panthor_device_unplug(struct panthor_device *ptdev) /* Now, try to cleanly shutdown the GPU before the device resources * get reclaimed. */ + panthor_gem_fini(ptdev); panthor_sched_unplug(ptdev); panthor_fw_unplug(ptdev); panthor_mmu_unplug(ptdev); @@ -269,6 +271,8 @@ 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_device.h b/drivers/gpu/drm/pan= thor/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; =20 + /** @huge_mnt: tmpfs mount point with Transparent Hugepage enabled. */ + struct vfsmount *huge_mnt; + /** @unplug: Device unplug related fields. */ struct { /** @lock: Lock used to serialize unplug operations. */ diff --git a/drivers/gpu/drm/panthor/panthor_drv.c b/drivers/gpu/drm/pantho= r/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_drive= r_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, boo= l, 0400); +MODULE_PARM_DESC(transparent_hugepage, "Use a dedicated tmpfs mount point = 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/pantho= r/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/pantho= r/panthor_gem.c index 156c7a0b62a2..16916e0b6d89 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 +12,35 @@ #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) +{ + struct vfsmount *huge_mnt; + + if (!panthor_transparent_hugepage) + return; + + huge_mnt =3D drm_gem_shmem_huge_mnt_create("within_size"); + if (IS_ERR(huge_mnt)) { + drm_warn(&ptdev->base, "Can't use Transparent Hugepage (%ld)\n", + PTR_ERR(huge_mnt)); + return; + } + + ptdev->huge_mnt =3D huge_mnt; + + drm_info(&ptdev->base, "Using Transparent Hugepage\n"); +} + +void panthor_gem_fini(struct panthor_device *ptdev) +{ + drm_gem_shmem_huge_mnt_free(ptdev->huge_mnt); +} + #ifdef CONFIG_DEBUG_FS static void panthor_gem_debugfs_bo_init(struct panthor_gem_object *bo) { @@ -270,10 +296,12 @@ panthor_gem_create_with_handle(struct drm_file *file, u64 *size, u32 flags, u32 *handle) { int ret; + struct panthor_device *ptdev =3D + container_of(ddev, struct panthor_device, base); struct drm_gem_shmem_object *shmem; struct panthor_gem_object *bo; =20 - shmem =3D drm_gem_shmem_create(ddev, *size); + shmem =3D drm_gem_shmem_create_with_mnt(ddev, *size, ptdev->huge_mnt); if (IS_ERR(shmem)) return PTR_ERR(shmem); =20 diff --git a/drivers/gpu/drm/panthor/panthor_gem.h b/drivers/gpu/drm/pantho= r/panthor_gem.h index 80c6e24112d0..6804b3912cc2 100644 --- a/drivers/gpu/drm/panthor/panthor_gem.h +++ b/drivers/gpu/drm/panthor/panthor_gem.h @@ -136,6 +136,9 @@ struct panthor_gem_object *to_panthor_bo(struct drm_gem= _object *obj) return container_of(to_drm_gem_shmem_obj(obj), struct panthor_gem_object,= base); } =20 +void panthor_gem_init(struct panthor_device *ptdev); +void panthor_gem_fini(struct panthor_device *ptdev); + struct drm_gem_object *panthor_gem_create_object(struct drm_device *ddev, = size_t size); =20 int --=20 2.47.3