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=-20.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=ham 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 38B82C56201 for ; Tue, 24 Nov 2020 11:44:14 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id CC4622076B for ; Tue, 24 Nov 2020 11:44:13 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org CC4622076B Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=amd-gfx-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 0FEA66E2E1; Tue, 24 Nov 2020 11:44:13 +0000 (UTC) Received: from mx2.suse.de (mx2.suse.de [195.135.220.15]) by gabe.freedesktop.org (Postfix) with ESMTPS id 4FCE36E22F; Tue, 24 Nov 2020 11:44:11 +0000 (UTC) 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 E2ABBAC2E; Tue, 24 Nov 2020 11:44:09 +0000 (UTC) Subject: Re: [PATCH 4/7] drm/radeon: Pin buffers while they are vmap'ed To: =?UTF-8?Q?Christian_K=c3=b6nig?= , alexander.deucher@amd.com, airlied@linux.ie, daniel@ffwll.ch, maarten.lankhorst@linux.intel.com, mripard@kernel.org References: <20201112132117.27228-1-tzimmermann@suse.de> <20201112132117.27228-5-tzimmermann@suse.de> <3daf9b24-034a-9791-ce30-9f5eba66e7c1@amd.com> <516877c4-3718-1415-9901-62bffdbf26c8@suse.de> <94fa26eb-d899-8c83-9325-84532639d438@suse.de> <6319ba4d-f45f-77ec-8752-33f3cad443fd@amd.com> From: Thomas Zimmermann Message-ID: Date: Tue, 24 Nov 2020 12:44:09 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.4.3 MIME-Version: 1.0 In-Reply-To: <6319ba4d-f45f-77ec-8752-33f3cad443fd@amd.com> X-BeenThere: amd-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Discussion list for AMD gfx List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org Content-Type: multipart/mixed; boundary="===============0992411143==" Errors-To: amd-gfx-bounces@lists.freedesktop.org Sender: "amd-gfx" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --===============0992411143== Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="BzNIh6eOAqxrnPeFHfYVblzot5OZsAs6I" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --BzNIh6eOAqxrnPeFHfYVblzot5OZsAs6I Content-Type: multipart/mixed; boundary="1N6RLCBWiq4IdLdPV9hTAeMHLlShQ8ynI"; protected-headers="v1" From: Thomas Zimmermann To: =?UTF-8?Q?Christian_K=c3=b6nig?= , alexander.deucher@amd.com, airlied@linux.ie, daniel@ffwll.ch, maarten.lankhorst@linux.intel.com, mripard@kernel.org Cc: dri-devel@lists.freedesktop.org, amd-gfx@lists.freedesktop.org Message-ID: Subject: Re: [PATCH 4/7] drm/radeon: Pin buffers while they are vmap'ed References: <20201112132117.27228-1-tzimmermann@suse.de> <20201112132117.27228-5-tzimmermann@suse.de> <3daf9b24-034a-9791-ce30-9f5eba66e7c1@amd.com> <516877c4-3718-1415-9901-62bffdbf26c8@suse.de> <94fa26eb-d899-8c83-9325-84532639d438@suse.de> <6319ba4d-f45f-77ec-8752-33f3cad443fd@amd.com> In-Reply-To: <6319ba4d-f45f-77ec-8752-33f3cad443fd@amd.com> --1N6RLCBWiq4IdLdPV9hTAeMHLlShQ8ynI Content-Type: multipart/mixed; boundary="------------3E41155C176954B421F1D368" Content-Language: en-US This is a multi-part message in MIME format. --------------3E41155C176954B421F1D368 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable Hi Am 24.11.20 um 12:30 schrieb Christian K=C3=B6nig: > Am 24.11.20 um 10:16 schrieb Thomas Zimmermann: >> Hi Christian >> >> Am 16.11.20 um 12:28 schrieb Christian K=C3=B6nig: >>> Am 13.11.20 um 08:59 schrieb Thomas Zimmermann: >>>> Hi Christian >>>> >>>> Am 12.11.20 um 18:16 schrieb Christian K=C3=B6nig: >>>>> Am 12.11.20 um 14:21 schrieb Thomas Zimmermann: >>>>>> In order to avoid eviction of vmap'ed buffers, pin them in their G= EM >>>>>> object's vmap implementation. Unpin them in the vunmap=20 >>>>>> implementation. >>>>>> This is needed to make generic fbdev support work reliably. Withou= t, >>>>>> the buffer object could be evicted while fbdev flushed its shadow = >>>>>> buffer. >>>>>> >>>>>> In difference to the PRIME pin/unpin functions, the vmap code does= =20 >>>>>> not >>>>>> modify the BOs prime_shared_count, so a vmap-pinned BO does not=20 >>>>>> count as >>>>>> shared. >>>>>> >>>>>> The actual pin location is not important as the vmap call returns >>>>>> information on how to access the buffer. Callers that require a >>>>>> specific location should explicitly pin the BO before vmapping it.= >>>>> Well is the buffer supposed to be scanned out? >>>> No, not by the fbdev helper. >>> >>> Ok in this case that should work. >>> >>>>> If yes then the pin location is actually rather important since the= >>>>> hardware can only scan out from VRAM. >>>> For relocatable BOs, fbdev uses a shadow buffer that makes all any >>>> relocation transparent to userspace. It flushes the shadow fb into t= he >>>> BO's memory if there are updates. The code is in >>>> drm_fb_helper_dirty_work(). [1] During the flush operation, the vmap= >>>> call now pins the BO to wherever it is. The actual location does not= >>>> matter. It's vunmap'ed immediately afterwards. >>> >>> The problem is what happens when it is prepared for scanout, but=20 >>> can't be moved to VRAM because it is vmapped? >>> >>> When the shadow is never scanned out that isn't a problem, but we=20 >>> need to keep that in mind. >>> >> >> I'd like ask for your suggestions before sending an update for this=20 >> patch. >> >> After the discussion about locking in fbdev, [1] I intended to replace= =20 >> the pin call with code that acquires the reservation lock. >=20 > Yeah, that sounds like a good idea to me as well. >=20 >> First I wanted to put this into drm_gem_ttm_vmap/vunmap(), but then=20 >> wondered why ttm_bo_vmap() doe not acquire the lock internally? I'd=20 >> expect that vmap/vunmap are close together and do not overlap for the = >> same BO.=20 >=20 > We have use cases like the following during command submission: >=20 > 1. lock > 2. map > 3. copy parts of the BO content somewhere else or patch it with=20 > additional information > 4. unmap > 5. submit BO to the hardware > 6. add hardware fence to the BO to make sure it doesn't move > 7. unlock >=20 > That use case won't be possible with vmap/vunmap if we move the=20 > lock/unlock into it and I hope to replace the kmap/kunmap functions wit= h=20 > them in the near term. >=20 >> Otherwise, acquiring the reservation lock would require another=20 >> ref-counting variable or per-driver code. >=20 > Hui, why that? Just put this into drm_gem_ttm_vmap/vunmap() helper as=20 > you initially planned. Given your example above, step one would acquire the lock, and step two=20 would also acquire the lock as part of the vmap implementation. Wouldn't = this fail (At least during unmap or unlock steps) ? Best regards Thomas >=20 > Regards, > Christian. >=20 >> >> Best regards >> Thomas >> >> [1] https://patchwork.freedesktop.org/patch/401088/?series=3D83918&rev= =3D1 >> >>> Regards, >>> Christian. >>> >>>> >>>> For dma-buf sharing, the regular procedure of pin + vmap still apply= =2E >>>> This should always move the BO into GTT-managed memory. >>>> >>>> Best regards >>>> Thomas >>>> >>>> [1] >>>> https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2F= git.kernel.org%2Fpub%2Fscm%2Flinux%2Fkernel%2Fgit%2Ftorvalds%2Flinux.git%= 2Ftree%2Fdrivers%2Fgpu%2Fdrm%2Fdrm_fb_helper.c%23n432&data=3D04%7C01%= 7Cchristian.koenig%40amd.com%7C31b890664ca7429fc45808d887aa0842%7C3dd8961= fe4884e608e11a82d994e183d%7C0%7C0%7C637408511650629569%7CUnknown%7CTWFpbG= Zsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%= 7C1000&sdata=3DRLauuAuXkcl0rXwWWJ%2FrKP%2BsCr2wAzU1ejGV1bnQ80w%3D&= ;reserved=3D0=20 >>>> >>>> >>>>> Regards, >>>>> Christian. >>>>> >>>>>> Signed-off-by: Thomas Zimmermann >>>>>> --- >>>>>> =C2=A0=C2=A0 drivers/gpu/drm/radeon/radeon_gem.c | 51=20 >>>>>> +++++++++++++++++++++++++++-- >>>>>> =C2=A0=C2=A0 1 file changed, 49 insertions(+), 2 deletions(-) >>>>>> >>>>>> diff --git a/drivers/gpu/drm/radeon/radeon_gem.c >>>>>> b/drivers/gpu/drm/radeon/radeon_gem.c >>>>>> index d2876ce3bc9e..eaf7fc9a7b07 100644 >>>>>> --- a/drivers/gpu/drm/radeon/radeon_gem.c >>>>>> +++ b/drivers/gpu/drm/radeon/radeon_gem.c >>>>>> @@ -226,6 +226,53 @@ static int radeon_gem_handle_lockup(struct >>>>>> radeon_device *rdev, int r) >>>>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 return r; >>>>>> =C2=A0=C2=A0 } >>>>>> =C2=A0=C2=A0 +static int radeon_gem_object_vmap(struct drm_gem_obj= ect *obj, >>>>>> struct dma_buf_map *map) >>>>>> +{ >>>>>> +=C2=A0=C2=A0=C2=A0 static const uint32_t any_domain =3D RADEON_GE= M_DOMAIN_VRAM | >>>>>> +=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=C2=A0=C2=A0=C2=A0=C2=A0 RADEON= _GEM_DOMAIN_GTT | >>>>>> +=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=C2=A0=C2=A0=C2=A0=C2=A0 RADEON= _GEM_DOMAIN_CPU; >>>>>> + >>>>>> +=C2=A0=C2=A0=C2=A0 struct radeon_bo *bo =3D gem_to_radeon_bo(obj)= ; >>>>>> +=C2=A0=C2=A0=C2=A0 int ret; >>>>>> + >>>>>> +=C2=A0=C2=A0=C2=A0 ret =3D radeon_bo_reserve(bo, false); >>>>>> +=C2=A0=C2=A0=C2=A0 if (ret) >>>>>> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 return ret; >>>>>> + >>>>>> +=C2=A0=C2=A0=C2=A0 /* pin buffer at its current location */ >>>>>> +=C2=A0=C2=A0=C2=A0 ret =3D radeon_bo_pin(bo, any_domain, NULL); >>>>>> +=C2=A0=C2=A0=C2=A0 if (ret) >>>>>> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 goto err_radeon_bo_unr= eserve; >>>>>> + >>>>>> +=C2=A0=C2=A0=C2=A0 ret =3D drm_gem_ttm_vmap(obj, map); >>>>>> +=C2=A0=C2=A0=C2=A0 if (ret) >>>>>> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 goto err_radeon_bo_unp= in; >>>>>> + >>>>>> +=C2=A0=C2=A0=C2=A0 radeon_bo_unreserve(bo); >>>>>> + >>>>>> +=C2=A0=C2=A0=C2=A0 return 0; >>>>>> + >>>>>> +err_radeon_bo_unpin: >>>>>> +=C2=A0=C2=A0=C2=A0 radeon_bo_unpin(bo); >>>>>> +err_radeon_bo_unreserve: >>>>>> +=C2=A0=C2=A0=C2=A0 radeon_bo_unreserve(bo); >>>>>> +=C2=A0=C2=A0=C2=A0 return ret; >>>>>> +} >>>>>> + >>>>>> +static void radeon_gem_object_vunmap(struct drm_gem_object *obj, >>>>>> struct dma_buf_map *map) >>>>>> +{ >>>>>> +=C2=A0=C2=A0=C2=A0 struct radeon_bo *bo =3D gem_to_radeon_bo(obj)= ; >>>>>> +=C2=A0=C2=A0=C2=A0 int ret; >>>>>> + >>>>>> +=C2=A0=C2=A0=C2=A0 ret =3D radeon_bo_reserve(bo, false); >>>>>> +=C2=A0=C2=A0=C2=A0 if (ret) >>>>>> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 return; >>>>>> + >>>>>> +=C2=A0=C2=A0=C2=A0 drm_gem_ttm_vunmap(obj, map); >>>>>> +=C2=A0=C2=A0=C2=A0 radeon_bo_unpin(bo); >>>>>> +=C2=A0=C2=A0=C2=A0 radeon_bo_unreserve(bo); >>>>>> +} >>>>>> + >>>>>> =C2=A0=C2=A0 static const struct drm_gem_object_funcs=20 >>>>>> radeon_gem_object_funcs =3D { >>>>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 .free =3D radeon_gem_object_f= ree, >>>>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 .open =3D radeon_gem_object_o= pen, >>>>>> @@ -234,8 +281,8 @@ static const struct drm_gem_object_funcs >>>>>> radeon_gem_object_funcs =3D { >>>>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 .pin =3D radeon_gem_prime_pin= , >>>>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 .unpin =3D radeon_gem_prime_u= npin, >>>>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 .get_sg_table =3D radeon_gem_= prime_get_sg_table, >>>>>> -=C2=A0=C2=A0=C2=A0 .vmap =3D drm_gem_ttm_vmap, >>>>>> -=C2=A0=C2=A0=C2=A0 .vunmap =3D drm_gem_ttm_vunmap, >>>>>> +=C2=A0=C2=A0=C2=A0 .vmap =3D radeon_gem_object_vmap, >>>>>> +=C2=A0=C2=A0=C2=A0 .vunmap =3D radeon_gem_object_vunmap, >>>>>> =C2=A0=C2=A0 }; >>>>>> =C2=A0=C2=A0 =C2=A0 /* >>>>> _______________________________________________ >>>>> dri-devel mailing list >>>>> dri-devel@lists.freedesktop.org >>>>> https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2= Flists.freedesktop.org%2Fmailman%2Flistinfo%2Fdri-devel&data=3D04%7C0= 1%7Cchristian.koenig%40amd.com%7C31b890664ca7429fc45808d887aa0842%7C3dd89= 61fe4884e608e11a82d994e183d%7C0%7C0%7C637408511650629569%7CUnknown%7CTWFp= bGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3= D%7C1000&sdata=3Dh1U9Po83K7webxsiKpn3ZGFz9Fcg6SRkxtrXWZ1%2B%2FEc%3D&a= mp;reserved=3D0=20 >>>>> >>> >>> _______________________________________________ >>> dri-devel mailing list >>> dri-devel@lists.freedesktop.org >>> https://lists.freedesktop.org/mailman/listinfo/dri-devel >> >=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 --------------3E41155C176954B421F1D368 Content-Type: application/pgp-keys; name="OpenPGP_0x680DC11D530B7A23.asc" Content-Transfer-Encoding: quoted-printable Content-Disposition: attachment; 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