From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 82B23C433E0 for ; Mon, 22 Feb 2021 13:31:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3BD8A64E5C for ; Mon, 22 Feb 2021 13:31:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231902AbhBVNae (ORCPT ); Mon, 22 Feb 2021 08:30:34 -0500 Received: from mx2.suse.de ([195.135.220.15]:47950 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231358AbhBVN2T (ORCPT ); Mon, 22 Feb 2021 08:28:19 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id F1F29AFF2; Mon, 22 Feb 2021 13:24:42 +0000 (UTC) Subject: Re: [PATCH v2 0/3] drm/prime: Only call dma_map_sgtable() for devices with DMA support To: =?UTF-8?Q?Christian_K=c3=b6nig?= , daniel@ffwll.ch, airlied@linux.ie, maarten.lankhorst@linux.intel.com, mripard@kernel.org, yuq825@gmail.com, robh@kernel.org, tomeu.vizoso@collabora.com, steven.price@arm.com, alyssa.rosenzweig@collabora.com, eric@anholt.net, sumit.semwal@linaro.org, stern@rowland.harvard.edu Cc: dri-devel@lists.freedesktop.org, lima@lists.freedesktop.org, linux-media@vger.kernel.org, linaro-mm-sig@lists.linaro.org References: <20210222124328.27340-1-tzimmermann@suse.de> From: Thomas Zimmermann Message-ID: <238ce852-730b-e31c-a6fe-a9ecaca497e3@suse.de> Date: Mon, 22 Feb 2021 14:24:41 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.7.1 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="lN59ZmJV8jpzHkc8mY8FfIQNtjxmDSFKJ" Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --lN59ZmJV8jpzHkc8mY8FfIQNtjxmDSFKJ Content-Type: multipart/mixed; boundary="ngtDDk2Psjhu8uZGC0uxh9YKnrrSxlB7n"; protected-headers="v1" From: Thomas Zimmermann To: =?UTF-8?Q?Christian_K=c3=b6nig?= , daniel@ffwll.ch, airlied@linux.ie, maarten.lankhorst@linux.intel.com, mripard@kernel.org, yuq825@gmail.com, robh@kernel.org, tomeu.vizoso@collabora.com, steven.price@arm.com, alyssa.rosenzweig@collabora.com, eric@anholt.net, sumit.semwal@linaro.org, stern@rowland.harvard.edu Cc: dri-devel@lists.freedesktop.org, lima@lists.freedesktop.org, linux-media@vger.kernel.org, linaro-mm-sig@lists.linaro.org Message-ID: <238ce852-730b-e31c-a6fe-a9ecaca497e3@suse.de> Subject: Re: [PATCH v2 0/3] drm/prime: Only call dma_map_sgtable() for devices with DMA support References: <20210222124328.27340-1-tzimmermann@suse.de> In-Reply-To: --ngtDDk2Psjhu8uZGC0uxh9YKnrrSxlB7n Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: quoted-printable Hi Am 22.02.21 um 14:09 schrieb Christian K=C3=B6nig: >=20 >=20 > Am 22.02.21 um 13:43 schrieb Thomas Zimmermann: >> USB-based drivers cannot use DMA, so the importing of dma-buf attachme= nts >> currently fails for udl and gm12u320. This breaks joining/mirroring of= >> displays. >> >> The fix is now a little series. To solve the issue on the importer >> side (i.e., the affected USB-based driver), patch 1 introduces a new >> PRIME callback, struct drm_driver.gem_prime_create_object, which creat= es >> an object and gives more control to the importing driver. Specifically= , >> udl and gm12u320 can now avoid the creation of a scatter/gather table >> for the imported pages. Patch 1 is self-contained in the sense that it= >> can be backported into older kernels. >=20 > Mhm, that sounds like a little overkill to me. >=20 > Drivers can already import the DMA-bufs all by them selves without the = > help of the DRM functions. See amdgpu for an example. >=20 > Daniel also already noted to me that he sees the DRM helper as a bit=20 > questionable middle layer. And this bug proves that it is. :) >=20 > Have you thought about doing that instead? There appears to be some useful code in drm_gem_prime_import_dev(). But=20 if the general sentiment goes towards removing=20 gem_prime_import_sg_table, we can work towards that as well. Best regards Thomas >=20 > Christian. >=20 >> >> Patches 2 and 3 update SHMEM and CMA helpers to use the new callback. >> Effectively this moves the sg table setup from the PRIME helpers into >> the memory managers. SHMEM now supports devices without DMA support, >> so custom code can be removed from udl and g12u320. >> >> Tested by joining/mirroring displays of udl and radeon under Gnome/X11= =2E >> >> v2: >> =C2=A0=C2=A0=C2=A0=C2=A0* move fix to importer side (Christian, Daniel= ) >> =C2=A0=C2=A0=C2=A0=C2=A0* update SHMEM and CMA helpers for new PRIME c= allbacks >> >> Thomas Zimmermann (3): >> =C2=A0=C2=A0 drm: Support importing dmabufs into drivers without DMA >> =C2=A0=C2=A0 drm/shmem-helper: Implement struct drm_driver.gem_prime_c= reate_object >> =C2=A0=C2=A0 drm/cma-helper: Implement struct drm_driver.gem_prime_cre= ate_object >> >> =C2=A0 drivers/gpu/drm/drm_gem_cma_helper.c=C2=A0=C2=A0=C2=A0 | 62 +++= +++++++++++----------- >> =C2=A0 drivers/gpu/drm/drm_gem_shmem_helper.c=C2=A0 | 38 ++++++++++---= -- >> =C2=A0 drivers/gpu/drm/drm_prime.c=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 | 43 +++++++++++------ >> =C2=A0 drivers/gpu/drm/lima/lima_drv.c=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0 |=C2=A0 2 +- >> =C2=A0 drivers/gpu/drm/panfrost/panfrost_drv.c |=C2=A0 2 +- >> =C2=A0 drivers/gpu/drm/panfrost/panfrost_gem.c |=C2=A0 6 +-- >> =C2=A0 drivers/gpu/drm/panfrost/panfrost_gem.h |=C2=A0 4 +- >> =C2=A0 drivers/gpu/drm/pl111/pl111_drv.c=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0 |=C2=A0 8 ++-- >> =C2=A0 drivers/gpu/drm/v3d/v3d_bo.c=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |=C2=A0 6 +-- >> =C2=A0 drivers/gpu/drm/v3d/v3d_drv.c=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0 |=C2=A0 2 +- >> =C2=A0 drivers/gpu/drm/v3d/v3d_drv.h=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0 |=C2=A0 5 +- >> =C2=A0 include/drm/drm_drv.h=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 | 12 += ++++ >> =C2=A0 include/drm/drm_gem_cma_helper.h=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0 | 12 ++--- >> =C2=A0 include/drm/drm_gem_shmem_helper.h=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= |=C2=A0 6 +-- >> =C2=A0 14 files changed, 120 insertions(+), 88 deletions(-) >> >> --=20 >> 2.30.1 >> >=20 --=20 Thomas Zimmermann Graphics Driver Developer SUSE Software Solutions Germany GmbH Maxfeldstr. 5, 90409 N=C3=BCrnberg, Germany (HRB 36809, AG N=C3=BCrnberg) Gesch=C3=A4ftsf=C3=BChrer: Felix Imend=C3=B6rffer --ngtDDk2Psjhu8uZGC0uxh9YKnrrSxlB7n-- --lN59ZmJV8jpzHkc8mY8FfIQNtjxmDSFKJ Content-Type: application/pgp-signature; name="OpenPGP_signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="OpenPGP_signature" -----BEGIN PGP SIGNATURE----- wsF5BAABCAAjFiEExndm/fpuMUdwYFFolh/E3EQov+AFAmAzsJkFAwAAAAAACgkQlh/E3EQov+D+ yw/6AklnkSPfC66cCH7wqHT72aMQYxDy4O4Ma5d4EhbIlfF++oLRkyMUj7bmtaPuHCB0LiN/o7F5 lObNcY7ZfLtthUDtAhhAZ4jMOGHX9iNzhKACOB1JoIyGJ3vyJdLFb/jwwdpnJNl9423zc36Vt2s7 VtUr7SNWeiUETO6yEf9rShfZ99yqR0xreGdp86/HCupibDXr3iGcg8esQNebP5i7Ksci6hWGihO4 K/s1cbofhGvmRVaUl97z8VVM/Px5WLISWn9pzWW5S3cFfHjxyFzoLir8YkbsiaekIcYicH9Hif7c EZJlwXfVGe3fyjVOBer1Sii1n1IClgeBsxi7anYgCfN64jRylAmCnxn5lCPUaXXRNeJgJtfL+iCc fAvwLOk1PYezWoZ56PQe3poOeDru7I3UV4CGoH5R+zS8hAJECSBDZB+taXnEJyKQ0gLSsxZ3RpUh c1w1aA0iVZ4hLQjk53DJPLlo8z/i6iFkCrRRJ90Y2cSvp9OoWah1Fwt4X0UZDz5rpuwgB6bOtuup Bwdft0u6Lx6v4uQU2qR5gnrEc+/B5WJqmIGBdV0xKpIrgdSJZbzsBdc5eHnhg5i3/4R6Zz+pIDdw dfgAq5XxeF9rUwHhQ5Q1i6Uv989q/N65NFdaehEyhrDySY+ooYvB/0G8FWExVMZ11dXptu1HAd/Q /1k= =70/N -----END PGP SIGNATURE----- --lN59ZmJV8jpzHkc8mY8FfIQNtjxmDSFKJ-- From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id EB715C433E0 for ; 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Mon, 22 Feb 2021 13:24:42 +0000 (UTC) Subject: Re: [PATCH v2 0/3] drm/prime: Only call dma_map_sgtable() for devices with DMA support To: =?UTF-8?Q?Christian_K=c3=b6nig?= , daniel@ffwll.ch, airlied@linux.ie, maarten.lankhorst@linux.intel.com, mripard@kernel.org, yuq825@gmail.com, robh@kernel.org, tomeu.vizoso@collabora.com, steven.price@arm.com, alyssa.rosenzweig@collabora.com, eric@anholt.net, sumit.semwal@linaro.org, stern@rowland.harvard.edu References: <20210222124328.27340-1-tzimmermann@suse.de> From: Thomas Zimmermann Message-ID: <238ce852-730b-e31c-a6fe-a9ecaca497e3@suse.de> Date: Mon, 22 Feb 2021 14:24:41 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.7.1 MIME-Version: 1.0 In-Reply-To: X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linaro-mm-sig@lists.linaro.org, lima@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-media@vger.kernel.org Content-Type: multipart/mixed; boundary="===============2040123664==" Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --===============2040123664== Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="lN59ZmJV8jpzHkc8mY8FfIQNtjxmDSFKJ" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --lN59ZmJV8jpzHkc8mY8FfIQNtjxmDSFKJ Content-Type: multipart/mixed; boundary="ngtDDk2Psjhu8uZGC0uxh9YKnrrSxlB7n"; protected-headers="v1" From: Thomas Zimmermann To: =?UTF-8?Q?Christian_K=c3=b6nig?= , daniel@ffwll.ch, airlied@linux.ie, maarten.lankhorst@linux.intel.com, mripard@kernel.org, yuq825@gmail.com, robh@kernel.org, tomeu.vizoso@collabora.com, steven.price@arm.com, alyssa.rosenzweig@collabora.com, eric@anholt.net, sumit.semwal@linaro.org, stern@rowland.harvard.edu Cc: dri-devel@lists.freedesktop.org, lima@lists.freedesktop.org, linux-media@vger.kernel.org, linaro-mm-sig@lists.linaro.org Message-ID: <238ce852-730b-e31c-a6fe-a9ecaca497e3@suse.de> Subject: Re: [PATCH v2 0/3] drm/prime: Only call dma_map_sgtable() for devices with DMA support References: <20210222124328.27340-1-tzimmermann@suse.de> In-Reply-To: --ngtDDk2Psjhu8uZGC0uxh9YKnrrSxlB7n Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: quoted-printable Hi Am 22.02.21 um 14:09 schrieb Christian K=C3=B6nig: >=20 >=20 > Am 22.02.21 um 13:43 schrieb Thomas Zimmermann: >> USB-based drivers cannot use DMA, so the importing of dma-buf attachme= nts >> currently fails for udl and gm12u320. This breaks joining/mirroring of= >> displays. >> >> The fix is now a little series. To solve the issue on the importer >> side (i.e., the affected USB-based driver), patch 1 introduces a new >> PRIME callback, struct drm_driver.gem_prime_create_object, which creat= es >> an object and gives more control to the importing driver. Specifically= , >> udl and gm12u320 can now avoid the creation of a scatter/gather table >> for the imported pages. Patch 1 is self-contained in the sense that it= >> can be backported into older kernels. >=20 > Mhm, that sounds like a little overkill to me. >=20 > Drivers can already import the DMA-bufs all by them selves without the = > help of the DRM functions. See amdgpu for an example. >=20 > Daniel also already noted to me that he sees the DRM helper as a bit=20 > questionable middle layer. And this bug proves that it is. :) >=20 > Have you thought about doing that instead? There appears to be some useful code in drm_gem_prime_import_dev(). But=20 if the general sentiment goes towards removing=20 gem_prime_import_sg_table, we can work towards that as well. Best regards Thomas >=20 > Christian. >=20 >> >> Patches 2 and 3 update SHMEM and CMA helpers to use the new callback. >> Effectively this moves the sg table setup from the PRIME helpers into >> the memory managers. SHMEM now supports devices without DMA support, >> so custom code can be removed from udl and g12u320. >> >> Tested by joining/mirroring displays of udl and radeon under Gnome/X11= =2E >> >> v2: >> =C2=A0=C2=A0=C2=A0=C2=A0* move fix to importer side (Christian, Daniel= ) >> =C2=A0=C2=A0=C2=A0=C2=A0* update SHMEM and CMA helpers for new PRIME c= allbacks >> >> Thomas Zimmermann (3): >> =C2=A0=C2=A0 drm: Support importing dmabufs into drivers without DMA >> =C2=A0=C2=A0 drm/shmem-helper: Implement struct drm_driver.gem_prime_c= reate_object >> =C2=A0=C2=A0 drm/cma-helper: Implement struct drm_driver.gem_prime_cre= ate_object >> >> =C2=A0 drivers/gpu/drm/drm_gem_cma_helper.c=C2=A0=C2=A0=C2=A0 | 62 +++= +++++++++++----------- >> =C2=A0 drivers/gpu/drm/drm_gem_shmem_helper.c=C2=A0 | 38 ++++++++++---= -- >> =C2=A0 drivers/gpu/drm/drm_prime.c=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 | 43 +++++++++++------ >> =C2=A0 drivers/gpu/drm/lima/lima_drv.c=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0 |=C2=A0 2 +- >> =C2=A0 drivers/gpu/drm/panfrost/panfrost_drv.c |=C2=A0 2 +- >> =C2=A0 drivers/gpu/drm/panfrost/panfrost_gem.c |=C2=A0 6 +-- >> =C2=A0 drivers/gpu/drm/panfrost/panfrost_gem.h |=C2=A0 4 +- >> =C2=A0 drivers/gpu/drm/pl111/pl111_drv.c=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0 |=C2=A0 8 ++-- >> =C2=A0 drivers/gpu/drm/v3d/v3d_bo.c=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |=C2=A0 6 +-- >> =C2=A0 drivers/gpu/drm/v3d/v3d_drv.c=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0 |=C2=A0 2 +- >> =C2=A0 drivers/gpu/drm/v3d/v3d_drv.h=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0 |=C2=A0 5 +- >> =C2=A0 include/drm/drm_drv.h=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 | 12 += ++++ >> =C2=A0 include/drm/drm_gem_cma_helper.h=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0 | 12 ++--- >> =C2=A0 include/drm/drm_gem_shmem_helper.h=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= |=C2=A0 6 +-- >> =C2=A0 14 files changed, 120 insertions(+), 88 deletions(-) >> >> --=20 >> 2.30.1 >> >=20 --=20 Thomas Zimmermann Graphics Driver Developer SUSE Software Solutions Germany GmbH Maxfeldstr. 5, 90409 N=C3=BCrnberg, Germany (HRB 36809, AG N=C3=BCrnberg) Gesch=C3=A4ftsf=C3=BChrer: Felix Imend=C3=B6rffer --ngtDDk2Psjhu8uZGC0uxh9YKnrrSxlB7n-- --lN59ZmJV8jpzHkc8mY8FfIQNtjxmDSFKJ Content-Type: application/pgp-signature; name="OpenPGP_signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="OpenPGP_signature" -----BEGIN PGP SIGNATURE----- wsF5BAABCAAjFiEExndm/fpuMUdwYFFolh/E3EQov+AFAmAzsJkFAwAAAAAACgkQlh/E3EQov+D+ yw/6AklnkSPfC66cCH7wqHT72aMQYxDy4O4Ma5d4EhbIlfF++oLRkyMUj7bmtaPuHCB0LiN/o7F5 lObNcY7ZfLtthUDtAhhAZ4jMOGHX9iNzhKACOB1JoIyGJ3vyJdLFb/jwwdpnJNl9423zc36Vt2s7 VtUr7SNWeiUETO6yEf9rShfZ99yqR0xreGdp86/HCupibDXr3iGcg8esQNebP5i7Ksci6hWGihO4 K/s1cbofhGvmRVaUl97z8VVM/Px5WLISWn9pzWW5S3cFfHjxyFzoLir8YkbsiaekIcYicH9Hif7c EZJlwXfVGe3fyjVOBer1Sii1n1IClgeBsxi7anYgCfN64jRylAmCnxn5lCPUaXXRNeJgJtfL+iCc fAvwLOk1PYezWoZ56PQe3poOeDru7I3UV4CGoH5R+zS8hAJECSBDZB+taXnEJyKQ0gLSsxZ3RpUh c1w1aA0iVZ4hLQjk53DJPLlo8z/i6iFkCrRRJ90Y2cSvp9OoWah1Fwt4X0UZDz5rpuwgB6bOtuup Bwdft0u6Lx6v4uQU2qR5gnrEc+/B5WJqmIGBdV0xKpIrgdSJZbzsBdc5eHnhg5i3/4R6Zz+pIDdw dfgAq5XxeF9rUwHhQ5Q1i6Uv989q/N65NFdaehEyhrDySY+ooYvB/0G8FWExVMZ11dXptu1HAd/Q /1k= =70/N -----END PGP SIGNATURE----- --lN59ZmJV8jpzHkc8mY8FfIQNtjxmDSFKJ-- --===============2040123664== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel --===============2040123664==--