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(unknown [IPv6:2a01:e0a:5e3:6100:2e0:4cff:fe03:d8c]) (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 758C717E13E4; Sat, 4 Oct 2025 11:31:08 +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 , Christopher Healy 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 v3 05/10] drm/v3d: Use huge tmpfs mount point helper Date: Sat, 4 Oct 2025 11:30:48 +0200 Message-ID: <20251004093054.21388-6-loic.molinari@collabora.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20251004093054.21388-1-loic.molinari@collabora.com> References: <20251004093054.21388-1-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 Make use of the new drm_gem_huge_mnt_create() helper to avoid code duplication. Now that it's just a few lines long, the single function in v3d_gemfs.c is moved into v3d_gem.c. v3: - use huge tmpfs mountpoint in drm_device - move v3d_gemfs.c into v3d_gem.c Signed-off-by: Lo=C3=AFc Molinari --- drivers/gpu/drm/v3d/Makefile | 3 +- drivers/gpu/drm/v3d/v3d_bo.c | 5 +-- drivers/gpu/drm/v3d/v3d_drv.c | 2 +- drivers/gpu/drm/v3d/v3d_drv.h | 11 +----- drivers/gpu/drm/v3d/v3d_gem.c | 33 ++++++++++++++++- drivers/gpu/drm/v3d/v3d_gemfs.c | 65 --------------------------------- 6 files changed, 36 insertions(+), 83 deletions(-) delete mode 100644 drivers/gpu/drm/v3d/v3d_gemfs.c diff --git a/drivers/gpu/drm/v3d/Makefile b/drivers/gpu/drm/v3d/Makefile index fcf710926057..b7d673f1153b 100644 --- a/drivers/gpu/drm/v3d/Makefile +++ b/drivers/gpu/drm/v3d/Makefile @@ -13,8 +13,7 @@ v3d-y :=3D \ v3d_trace_points.o \ v3d_sched.o \ v3d_sysfs.o \ - v3d_submit.o \ - v3d_gemfs.o + v3d_submit.o =20 v3d-$(CONFIG_DEBUG_FS) +=3D v3d_debugfs.o =20 diff --git a/drivers/gpu/drm/v3d/v3d_bo.c b/drivers/gpu/drm/v3d/v3d_bo.c index c41476ddde68..6b9909bfce82 100644 --- a/drivers/gpu/drm/v3d/v3d_bo.c +++ b/drivers/gpu/drm/v3d/v3d_bo.c @@ -112,7 +112,7 @@ v3d_bo_create_finish(struct drm_gem_object *obj) if (IS_ERR(sgt)) return PTR_ERR(sgt); =20 - if (!v3d->gemfs) + if (!obj->dev->huge_mnt) align =3D SZ_4K; else if (obj->size >=3D SZ_1M) align =3D SZ_1M; @@ -148,12 +148,11 @@ struct v3d_bo *v3d_bo_create(struct drm_device *dev, = struct drm_file *file_priv, size_t unaligned_size) { struct drm_gem_shmem_object *shmem_obj; - struct v3d_dev *v3d =3D to_v3d_dev(dev); struct v3d_bo *bo; int ret; =20 shmem_obj =3D drm_gem_shmem_create_with_mnt(dev, unaligned_size, - v3d->gemfs); + dev->huge_mnt); if (IS_ERR(shmem_obj)) return ERR_CAST(shmem_obj); bo =3D to_v3d_bo(&shmem_obj->base); diff --git a/drivers/gpu/drm/v3d/v3d_drv.c b/drivers/gpu/drm/v3d/v3d_drv.c index c5a3bbbc74c5..19ec0ea7f38e 100644 --- a/drivers/gpu/drm/v3d/v3d_drv.c +++ b/drivers/gpu/drm/v3d/v3d_drv.c @@ -106,7 +106,7 @@ static int v3d_get_param_ioctl(struct drm_device *dev, = void *data, args->value =3D v3d->perfmon_info.max_counters; return 0; case DRM_V3D_PARAM_SUPPORTS_SUPER_PAGES: - args->value =3D !!v3d->gemfs; + args->value =3D !!dev->huge_mnt; return 0; case DRM_V3D_PARAM_GLOBAL_RESET_COUNTER: mutex_lock(&v3d->reset_lock); diff --git a/drivers/gpu/drm/v3d/v3d_drv.h b/drivers/gpu/drm/v3d/v3d_drv.h index 0317f3d7452a..0b4fcb788168 100644 --- a/drivers/gpu/drm/v3d/v3d_drv.h +++ b/drivers/gpu/drm/v3d/v3d_drv.h @@ -156,11 +156,6 @@ struct v3d_dev { struct drm_mm mm; spinlock_t mm_lock; =20 - /* - * tmpfs instance used for shmem backed objects - */ - struct vfsmount *gemfs; - struct work_struct overflow_mem_work; =20 struct v3d_queue_state queue[V3D_MAX_QUEUES]; @@ -567,6 +562,7 @@ extern const struct dma_fence_ops v3d_fence_ops; struct dma_fence *v3d_fence_create(struct v3d_dev *v3d, enum v3d_queue q); =20 /* v3d_gem.c */ +extern bool super_pages; int v3d_gem_init(struct drm_device *dev); void v3d_gem_destroy(struct drm_device *dev); void v3d_reset_sms(struct v3d_dev *v3d); @@ -574,11 +570,6 @@ void v3d_reset(struct v3d_dev *v3d); void v3d_invalidate_caches(struct v3d_dev *v3d); void v3d_clean_caches(struct v3d_dev *v3d); =20 -/* v3d_gemfs.c */ -extern bool super_pages; -void v3d_gemfs_init(struct v3d_dev *v3d); -void v3d_gemfs_fini(struct v3d_dev *v3d); - /* v3d_submit.c */ void v3d_job_cleanup(struct v3d_job *job); void v3d_job_put(struct v3d_job *job); diff --git a/drivers/gpu/drm/v3d/v3d_gem.c b/drivers/gpu/drm/v3d/v3d_gem.c index c77d90aa9b82..1cf5ebe99c90 100644 --- a/drivers/gpu/drm/v3d/v3d_gem.c +++ b/drivers/gpu/drm/v3d/v3d_gem.c @@ -258,6 +258,36 @@ v3d_invalidate_caches(struct v3d_dev *v3d) v3d_invalidate_slices(v3d, 0); } =20 +static void +v3d_huge_mnt_init(struct v3d_dev *v3d) +{ + int err; + + /* + * By creating our own shmemfs mountpoint, we can pass in + * mount flags that better match our usecase. However, we + * only do so on platforms which benefit from it. + */ + if (!IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE)) + goto err; + + /* The user doesn't want to enable Super Pages */ + if (!super_pages) + goto err; + + err =3D drm_gem_huge_mnt_create(&v3d->drm, "within_size"); + if (err && err !=3D -EEXIST) + goto err; + + drm_info(&v3d->drm, "Using Transparent Hugepages\n"); + + return; + +err: + drm_notice(&v3d->drm, + "Transparent Hugepage support is recommended for optimal performance = on this platform!\n"); +} + int v3d_gem_init(struct drm_device *dev) { @@ -308,7 +338,7 @@ v3d_gem_init(struct drm_device *dev) v3d_init_hw_state(v3d); v3d_mmu_set_page_table(v3d); =20 - v3d_gemfs_init(v3d); + v3d_huge_mnt_init(v3d); =20 ret =3D v3d_sched_init(v3d); if (ret) { @@ -328,7 +358,6 @@ v3d_gem_destroy(struct drm_device *dev) enum v3d_queue q; =20 v3d_sched_fini(v3d); - v3d_gemfs_fini(v3d); =20 /* Waiting for jobs to finish would need to be done before * unregistering V3D. diff --git a/drivers/gpu/drm/v3d/v3d_gemfs.c b/drivers/gpu/drm/v3d/v3d_gemf= s.c deleted file mode 100644 index 8ec6ed82b3d9..000000000000 --- a/drivers/gpu/drm/v3d/v3d_gemfs.c +++ /dev/null @@ -1,65 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0+ -/* Copyright (C) 2024 Raspberry Pi */ - -#include -#include -#include - -#include "v3d_drv.h" - -static int add_param(struct fs_context *fc, const char *key, const char *v= al) -{ - return vfs_parse_fs_string(fc, key, val, strlen(val)); -} - -void v3d_gemfs_init(struct v3d_dev *v3d) -{ - struct file_system_type *type; - struct fs_context *fc; - struct vfsmount *gemfs; - int ret; - - /* - * By creating our own shmemfs mountpoint, we can pass in - * mount flags that better match our usecase. However, we - * only do so on platforms which benefit from it. - */ - if (!IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE)) - goto err; - - /* The user doesn't want to enable Super Pages */ - if (!super_pages) - goto err; - - type =3D get_fs_type("tmpfs"); - if (!type) - goto err; - - fc =3D fs_context_for_mount(type, SB_KERNMOUNT); - if (IS_ERR(fc)) - goto err; - ret =3D add_param(fc, "source", "tmpfs"); - if (!ret) - ret =3D add_param(fc, "huge", "within_size"); - if (!ret) - gemfs =3D fc_mount_longterm(fc); - put_fs_context(fc); - if (ret) - goto err; - - v3d->gemfs =3D gemfs; - drm_info(&v3d->drm, "Using Transparent Hugepages\n"); - - return; - -err: - v3d->gemfs =3D NULL; - drm_notice(&v3d->drm, - "Transparent Hugepage support is recommended for optimal performance = on this platform!\n"); -} - -void v3d_gemfs_fini(struct v3d_dev *v3d) -{ - if (v3d->gemfs) - kern_unmount(v3d->gemfs); -} --=20 2.47.3