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Wed, 19 Mar 2025 17:28:17 +0100 (CET) Date: Wed, 19 Mar 2025 17:28:12 +0100 From: Boris Brezillon To: =?UTF-8?B?QWRyacOhbg==?= Larumbe Cc: Steven Price , Liviu Dudau , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , kernel@collabora.com, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 2/4] drm/panthor: Add driver IOCTL for setting BO labels Message-ID: <20250319172812.106f1df1@collabora.com> In-Reply-To: References: <20250316215139.3940623-1-adrian.larumbe@collabora.com> <20250316215139.3940623-3-adrian.larumbe@collabora.com> <20250317085002.304305cf@collabora.com> Organization: Collabora X-Mailer: Claws Mail 4.3.0 (GTK 3.24.43; x86_64-redhat-linux-gnu) 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 On Wed, 19 Mar 2025 13:49:02 +0000 Adri=C3=A1n Larumbe wrote: > Hi Boris, >=20 > On 17.03.2025 08:50, Boris Brezillon wrote: > > On Sun, 16 Mar 2025 21:51:33 +0000 > > Adri=C3=A1n Larumbe wrote: > > =20 > > > Allow UM to label a BO for which it possesses a DRM handle. > > > > > > Signed-off-by: Adri=C3=A1n Larumbe > > > --- > > > drivers/gpu/drm/panthor/panthor_drv.c | 31 +++++++++++++++++++++++++= ++ > > > include/uapi/drm/panthor_drm.h | 14 ++++++++++++ > > > 2 files changed, 45 insertions(+) > > > > > > diff --git a/drivers/gpu/drm/panthor/panthor_drv.c b/drivers/gpu/drm/= panthor/panthor_drv.c > > > index 310bb44abe1a..f41b8946258f 100644 > > > --- a/drivers/gpu/drm/panthor/panthor_drv.c > > > +++ b/drivers/gpu/drm/panthor/panthor_drv.c > > > @@ -1330,6 +1330,35 @@ static int panthor_ioctl_vm_get_state(struct d= rm_device *ddev, void *data, > > > return 0; > > > } > > > > > > +static int panthor_ioctl_label_bo(struct drm_device *ddev, void *dat= a, > > > + struct drm_file *file) > > > +{ > > > + struct drm_panthor_label_bo *args =3D data; > > > + struct drm_gem_object *obj; > > > + const char *label; > > > + int ret =3D 0; > > > + > > > + obj =3D drm_gem_object_lookup(file, args->handle); > > > + if (!obj) > > > + return -ENOENT; > > > + > > > + if (args->len && args->label) { > > > + label =3D strndup_user(u64_to_user_ptr(args->label), args->len + 1= ); > > > + if (IS_ERR(label)) { > > > + ret =3D PTR_ERR(label); > > > + goto err_label; > > > + } > > > + } else > > > + label =3D NULL; > > > + > > > + panthor_gem_label_bo(obj, label); > > > + > > > +err_label: > > > + drm_gem_object_put(obj); > > > + > > > + return ret; > > > +} > > > + > > > static int > > > panthor_open(struct drm_device *ddev, struct drm_file *file) > > > { > > > @@ -1399,6 +1428,7 @@ static const struct drm_ioctl_desc panthor_drm_= driver_ioctls[] =3D { > > > PANTHOR_IOCTL(TILER_HEAP_CREATE, tiler_heap_create, DRM_RENDER_ALLO= W), > > > PANTHOR_IOCTL(TILER_HEAP_DESTROY, tiler_heap_destroy, DRM_RENDER_AL= LOW), > > > PANTHOR_IOCTL(GROUP_SUBMIT, group_submit, DRM_RENDER_ALLOW), > > > + PANTHOR_IOCTL(LABEL_BO, label_bo, DRM_RENDER_ALLOW), > > > }; > > > > > > static int panthor_mmap(struct file *filp, struct vm_area_struct *vm= a) > > > @@ -1508,6 +1538,7 @@ static void panthor_debugfs_init(struct drm_min= or *minor) > > > * - 1.2 - adds DEV_QUERY_GROUP_PRIORITIES_INFO query > > > * - adds PANTHOR_GROUP_PRIORITY_REALTIME priority > > > * - 1.3 - adds DRM_PANTHOR_GROUP_STATE_INNOCENT flag > > > + * - 1.4 - adds DRM_IOCTL_PANTHOR_LABEL_BO ioctl > > > */ > > > static const struct drm_driver panthor_drm_driver =3D { > > > .driver_features =3D DRIVER_RENDER | DRIVER_GEM | DRIVER_SYNCOBJ | > > > diff --git a/include/uapi/drm/panthor_drm.h b/include/uapi/drm/pantho= r_drm.h > > > index 97e2c4510e69..1a7ed567d36a 100644 > > > --- a/include/uapi/drm/panthor_drm.h > > > +++ b/include/uapi/drm/panthor_drm.h > > > @@ -127,6 +127,9 @@ enum drm_panthor_ioctl_id { > > > > > > /** @DRM_PANTHOR_TILER_HEAP_DESTROY: Destroy a tiler heap. */ > > > DRM_PANTHOR_TILER_HEAP_DESTROY, > > > + > > > + /** @DRM_PANTHOR_LABEL_BO: Label a BO. */ > > > + DRM_PANTHOR_LABEL_BO, =20 > > > > DRM_PANTHOR_BO_SET_LABEL to follow the DRM_PANTHOR__ > > naming scheme used in this file. > > > > I'd also be tempted to introduce a DRM_PANTHOR_BO_GET_LABEL ioctl while > > we're at it. =20 >=20 > I thought of this too, but I was a bit reluctant because at present there= are no UM > driver users who need this functionality. I guess the labeling done in mesa could be made to use GEM labels if the feature is supported. And honestly, I hate the idea of having an half-baked implementation allowing the user to set a label with no way to retrieve this label back. Can we at least change the name such that we can later add a GET_LABEL ioctl? >=20 > > > }; > > > > > > /** > > > @@ -977,6 +980,15 @@ struct drm_panthor_tiler_heap_destroy { > > > __u32 pad; > > > }; > > > > > > +/** > > > + * struct drm_panthor_label_bo - Arguments passed to DRM_IOCTL_PANTH= OR_LABEL_BO > > > + */ > > > +struct drm_panthor_label_bo { > > > + __u32 handle; > > > + __u32 len; > > > + __u64 label; =20 > > > > Can you document these fields? > > =20 > > > +}; > > > + > > > /** > > > * DRM_IOCTL_PANTHOR() - Build a Panthor IOCTL number > > > * @__access: Access type. Must be R, W or RW. > > > @@ -1019,6 +1031,8 @@ enum { > > > DRM_IOCTL_PANTHOR(WR, TILER_HEAP_CREATE, tiler_heap_create), > > > DRM_IOCTL_PANTHOR_TILER_HEAP_DESTROY =3D > > > DRM_IOCTL_PANTHOR(WR, TILER_HEAP_DESTROY, tiler_heap_destroy), > > > + DRM_IOCTL_PANTHOR_LABEL_BO =3D > > > + DRM_IOCTL_PANTHOR(WR, LABEL_BO, label_bo), > > > }; > > > > > > #if defined(__cplusplus) =20 >=20 >=20 > Adrian Larumbe