From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from bali.collaboradmins.com (bali.collaboradmins.com [148.251.105.195]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 565BD25A64B; Wed, 9 Apr 2025 07:58:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=148.251.105.195 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744185523; cv=none; b=EuRkFZ5vtaTKLZ4nX4Wz8LKMXd5a/5lvM67HBa7LGo24iwU6TvlDhzRBgtdVNgxXwxTRt35Z2n5x6QfOWEDwjv22GKpbEIntDtwLCHbrr2dmF7SiIQQcHFr5ylHIVapm9nVvNGHIBBaiM8uWmF7Vlu7Cy4+f7+qcS7t0b439YgM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744185523; c=relaxed/simple; bh=9OwpPAtClWlMtvf7MBL7jZcCqTq/xq396C20+WSwSiU=; h=Date:From:To:Cc:Subject:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=Qknb59x0duBPyiMCSQjQaREP8Zv7ae8fXwV8ojZh4sWRPIwBzle6dHmgN9eyd5/KaNEWx6ZHzJpkNewG6PX4FQcn8b/xbOET/rHjd9uM7XTetAcETBVadZz1vVqd0dgSdGYOtwDr52GXKW+Iib4dvuF22EYsIr6MHB0A+LSj4Ag= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=collabora.com; spf=pass smtp.mailfrom=collabora.com; dkim=pass (2048-bit key) header.d=collabora.com header.i=@collabora.com header.b=Co6A1xRc; arc=none smtp.client-ip=148.251.105.195 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=collabora.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=collabora.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=collabora.com header.i=@collabora.com header.b="Co6A1xRc" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1744185519; bh=9OwpPAtClWlMtvf7MBL7jZcCqTq/xq396C20+WSwSiU=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=Co6A1xRc5EeDeCYxUJxoeDF7OvCXTJE8jR5NmyLXNsxcK/4jcQWyiw2U6qPWyA3O8 oVM3rl4XvAC64CpjNWDvYkuBYbHpyzsoZ4mVVYmcH6lidEY1Ft/GrgOYV84eF81ecc uKxjcXYUxzFcZ6Sm8wknkihjfdMk3ZXavwXA4djPt9KUlrgTUiIrwZlTQJL9PkxgFV XDUGVYgOV7oEjtweqBShsUwRvi7+afCwuzAJRYz8HZdrE8REsq9g3XoFR9LmIBz+7Z NUn29bkh7kHv2fFEHcjFaq6WO5NyhsSQCZWWKwwfgWbwz2jmTu95YChU1g6J+1GhO0 tRit6wYXyLyhw== Received: from localhost (unknown [IPv6:2a01:e0a:2c:6930:5cf4:84a1:2763:fe0d]) (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: bbrezillon) by bali.collaboradmins.com (Postfix) with ESMTPSA id 9AB4917E0809; Wed, 9 Apr 2025 09:58:38 +0200 (CEST) Date: Wed, 9 Apr 2025 09:58:34 +0200 From: Boris Brezillon To: =?UTF-8?B?QWRyacOhbg==?= Larumbe Cc: Steven Price , Liviu Dudau , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Sumit Semwal , Christian =?UTF-8?B?S8O2bmln?= , kernel@collabora.com, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, linaro-mm-sig@lists.linaro.org Subject: Re: [PATCH v5 1/4] drm/panthor: Introduce BO labeling Message-ID: <20250409095834.3d6a6206@collabora.com> In-Reply-To: <20250408222427.1214330-2-adrian.larumbe@collabora.com> References: <20250408222427.1214330-1-adrian.larumbe@collabora.com> <20250408222427.1214330-2-adrian.larumbe@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 Tue, 8 Apr 2025 23:24:21 +0100 Adri=C3=A1n Larumbe wrote: > Add a new character string Panthor BO field, and a function that allows > setting it from within the driver. >=20 > Driver takes care of freeing the string when it's replaced or no longer > needed at object destruction time, but allocating it is the responsibility > of callers. >=20 > Signed-off-by: Adri=C3=A1n Larumbe One minor thing below, but this looks good otherwise Reviewed-by: Boris Brezillon > --- > drivers/gpu/drm/panthor/panthor_gem.c | 38 +++++++++++++++++++++++++++ > drivers/gpu/drm/panthor/panthor_gem.h | 17 ++++++++++++ > 2 files changed, 55 insertions(+) >=20 > diff --git a/drivers/gpu/drm/panthor/panthor_gem.c b/drivers/gpu/drm/pant= hor/panthor_gem.c > index 8244a4e6c2a2..7d017f9d1d52 100644 > --- a/drivers/gpu/drm/panthor/panthor_gem.c > +++ b/drivers/gpu/drm/panthor/panthor_gem.c > @@ -18,6 +18,14 @@ static void panthor_gem_free_object(struct drm_gem_obj= ect *obj) > struct panthor_gem_object *bo =3D to_panthor_bo(obj); > struct drm_gem_object *vm_root_gem =3D bo->exclusive_vm_root_gem; > =20 > + /* > + * Label might have been allocated with kstrdup_const(), > + * we need to take that into account when freeing the memory > + */ > + kfree_const(bo->label.str); > + > + mutex_destroy(&bo->label.lock); > + > drm_gem_free_mmap_offset(&bo->base.base); > mutex_destroy(&bo->gpuva_list_lock); > drm_gem_shmem_free(&bo->base); > @@ -196,6 +204,7 @@ struct drm_gem_object *panthor_gem_create_object(stru= ct drm_device *ddev, size_t > obj->base.map_wc =3D !ptdev->coherent; > mutex_init(&obj->gpuva_list_lock); > drm_gem_gpuva_set_lock(&obj->base.base, &obj->gpuva_list_lock); > + mutex_init(&obj->label.lock); > =20 > return &obj->base.base; > } > @@ -247,3 +256,32 @@ panthor_gem_create_with_handle(struct drm_file *file, > =20 > return ret; > } > + > +void > +panthor_gem_bo_set_label(struct drm_gem_object *obj, const char *label) > +{ > + struct panthor_gem_object *bo =3D to_panthor_bo(obj); > + const char *old_label; > + > + mutex_lock(&bo->label.lock); > + old_label =3D bo->label.str; > + bo->label.str =3D label; > + mutex_unlock(&bo->label.lock); Since you started using scoped_guard, maybe use it here too: scoped_guard(mutex, &bo->label.lock) { old_label =3D bo->label.str; bo->label.str =3D label; } > + > + kfree(old_label); > +} > + > +void > +panthor_gem_kernel_bo_set_label(struct panthor_kernel_bo *bo, const char= *label) > +{ > + const char *str; > + > + str =3D kstrdup_const(label, GFP_KERNEL); > + if (!str) { > + /* Failing to allocate memory for a label isn't a fatal condition */ > + drm_warn(bo->obj->dev, "Not enough memory to allocate BO label"); > + return; > + } > + > + panthor_gem_bo_set_label(bo->obj, kstrdup_const(str, GFP_KERNEL)); > +} > diff --git a/drivers/gpu/drm/panthor/panthor_gem.h b/drivers/gpu/drm/pant= hor/panthor_gem.h > index 5749ef2ebe03..0582826b341a 100644 > --- a/drivers/gpu/drm/panthor/panthor_gem.h > +++ b/drivers/gpu/drm/panthor/panthor_gem.h > @@ -46,6 +46,20 @@ struct panthor_gem_object { > =20 > /** @flags: Combination of drm_panthor_bo_flags flags. */ > u32 flags; > + > + /** > + * @label: BO tagging fields. The label can be assigned within the > + * driver itself or through a specific IOCTL. > + */ > + struct { > + /** > + * @label.str: Pointer to NULL-terminated string, > + */ > + const char *str; > + > + /** @lock.str: Protects access to the @label.str field. */ > + struct mutex lock; > + } label; > }; > =20 > /** > @@ -91,6 +105,9 @@ panthor_gem_create_with_handle(struct drm_file *file, > struct panthor_vm *exclusive_vm, > u64 *size, u32 flags, uint32_t *handle); > =20 > +void panthor_gem_bo_set_label(struct drm_gem_object *obj, const char *la= bel); > +void panthor_gem_kernel_bo_set_label(struct panthor_kernel_bo *bo, const= char *label); > + > static inline u64 > panthor_kernel_bo_gpuva(struct panthor_kernel_bo *bo) > {