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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 B4B2A17E13D8; Mon, 29 Sep 2025 22:04:41 +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 3/8] drm/shmem-helper: Add huge tmpfs mount point helpers Date: Mon, 29 Sep 2025 22:03:11 +0200 Message-ID: <20250929200316.18417-4-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 Add the drm_gem_shmem_helper_huge_mnt_create() and drm_gem_shmem_helper_huge_mnt_free() helpers to avoid code duplication in the i915 and v3d drivers (and soon panfrost/panthor). Signed-off-by: Lo=C3=AFc Molinari --- drivers/gpu/drm/drm_gem_shmem_helper.c | 56 ++++++++++++++++++++++++++ include/drm/drm_gem_shmem_helper.h | 14 +++++++ 2 files changed, 70 insertions(+) diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_g= em_shmem_helper.c index 22c4b09e10a3..808721b8be3e 100644 --- a/drivers/gpu/drm/drm_gem_shmem_helper.c +++ b/drivers/gpu/drm/drm_gem_shmem_helper.c @@ -5,7 +5,9 @@ =20 #include #include +#include #include +#include #include #include #include @@ -36,6 +38,60 @@ MODULE_IMPORT_NS("DMA_BUF"); * drm_gem_shmem_vmap()). These helpers perform the necessary type convers= ion. */ =20 +static int drm_gem_shmem_add_fc_param(struct fs_context *fc, const char *k= ey, + const char *value) +{ + return vfs_parse_fs_string(fc, key, value, strlen(value)); +} + +/** + * drm_gem_shmem_huge_mnt_create - Create a huge tmpfs mountpoint + * @value: huge tmpfs mount option value + * + * This function creates and mounts an internal huge tmpfs mountpoint for = use + * with the drm_gem_shmem_create_with_mnt() function. + * + * The most common option value is "within_size" which only allocates huge= pages + * if the page will be fully within the GEM object size. "always", "advise= " and + * "never" are supported too but the latter would just create a mountpoint + * similar to default "shm_mnt" one. See shmemfs and Transparent Hugepage = for + * more information. + * + * Returns: + * A struct vfsmount * on success or an ERR_PTR()-encoded negative error c= ode on + * failure. + */ +struct vfsmount *drm_gem_shmem_huge_mnt_create(const char *value) +{ + struct file_system_type *type; + struct fs_context *fc; + struct vfsmount *mnt; + int ret; + + if (!IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE)) + return ERR_PTR(-EOPNOTSUPP); + + type =3D get_fs_type("tmpfs"); + if (!type) + return ERR_PTR(-EOPNOTSUPP); + + fc =3D fs_context_for_mount(type, SB_KERNMOUNT); + if (IS_ERR(fc)) + return ERR_CAST(fc); + ret =3D drm_gem_shmem_add_fc_param(fc, "source", "tmpfs"); + if (ret) + return ERR_PTR(-ENOPARAM); + ret =3D drm_gem_shmem_add_fc_param(fc, "huge", value); + if (ret) + return ERR_PTR(-ENOPARAM); + + mnt =3D fc_mount_longterm(fc); + put_fs_context(fc); + + return mnt; +} +EXPORT_SYMBOL_GPL(drm_gem_shmem_huge_mnt_create); + static const struct drm_gem_object_funcs drm_gem_shmem_funcs =3D { .free =3D drm_gem_shmem_object_free, .print_info =3D drm_gem_shmem_object_print_info, diff --git a/include/drm/drm_gem_shmem_helper.h b/include/drm/drm_gem_shmem= _helper.h index 589f7bfe7506..5e153fb63f38 100644 --- a/include/drm/drm_gem_shmem_helper.h +++ b/include/drm/drm_gem_shmem_helper.h @@ -107,6 +107,20 @@ struct drm_gem_shmem_object { #define to_drm_gem_shmem_obj(obj) \ container_of(obj, struct drm_gem_shmem_object, base) =20 +struct vfsmount *drm_gem_shmem_huge_mnt_create(const char *value); + +/** + * drm_gem_shmem_huge_mnt_free - Release a huge tmpfs mountpoint. + * @mnt: struct vfsmount * to release + * + * This function unmounts and releases an internal huge tmpfs mountpoint. = If + * @mnt is NULL, no operation is performed. + */ +static inline void drm_gem_shmem_huge_mnt_free(struct vfsmount *mnt) +{ + kern_unmount(mnt); +} + int drm_gem_shmem_init(struct drm_device *dev, struct drm_gem_shmem_object= *shmem, size_t size); struct drm_gem_shmem_object *drm_gem_shmem_create(struct drm_device *dev, = size_t size); struct drm_gem_shmem_object *drm_gem_shmem_create_with_mnt(struct drm_devi= ce *dev, --=20 2.47.3