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Wed, 26 Jun 2019 17:50:47 +0000 Received: from abhmp0005.oracle.com (abhmp0005.oracle.com [141.146.116.11]) by aserv0121.oracle.com (8.14.4/8.13.8) with ESMTP id x5QHofTs013200; Wed, 26 Jun 2019 17:50:42 GMT Received: from [10.65.138.107] (/10.65.138.107) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Wed, 26 Jun 2019 10:50:41 -0700 Subject: Re: [PATCH v18 10/15] drm/radeon: untag user pointers in radeon_gem_userptr_ioctl To: Andrey Konovalov , linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-rdma@vger.kernel.org, linux-media@vger.kernel.org, kvm@vger.kernel.org, linux-kselftest@vger.kernel.org Cc: Catalin Marinas , Vincenzo Frascino , Will Deacon , Mark Rutland , Andrew Morton , Greg Kroah-Hartman , Kees Cook , Yishai Hadas , Felix Kuehling , Alexander Deucher , Christian Koenig , Mauro Carvalho Chehab , Jens Wiklander , Alex Williamson , Leon Romanovsky , Luc Van Oostenryck , Dave Martin , enh , Jason Gunthorpe , Christoph Hellwig , Dmitry Vyukov , Kostya Serebryany , Evgeniy Stepanov , Lee Smith , Ramana Radhakrishnan , Jacob Bramley , Ruben Ayrapetyan , Robin Murphy , Kevin Brodsky , Szabolcs Nagy References: <61d800c35a4f391218fbca6f05ec458557d8d097.1561386715.git.andreyknvl@google.com> From: Khalid Aziz Organization: Oracle Corp Message-ID: <28554e21-04b8-2461-e576-5abe0b53cd59@oracle.com> Date: Wed, 26 Jun 2019 11:50:39 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <61d800c35a4f391218fbca6f05ec458557d8d097.1561386715.git.andreyknvl@google.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9300 signatures=668687 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1906260208 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9300 signatures=668687 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1906260208 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 6/24/19 8:32 AM, Andrey Konovalov wrote: > This patch is a part of a series that extends kernel ABI to allow to pa= ss > tagged user pointers (with the top byte set to something else other tha= n > 0x00) as syscall arguments. >=20 > In radeon_gem_userptr_ioctl() an MMU notifier is set up with a (tagged)= > userspace pointer. The untagged address should be used so that MMU > notifiers for the untagged address get correctly matched up with the ri= ght > BO. This funcation also calls radeon_ttm_tt_pin_userptr(), which uses > provided user pointers for vma lookups, which can only by done with > untagged pointers. >=20 > This patch untags user pointers in radeon_gem_userptr_ioctl(). >=20 > Suggested-by: Felix Kuehling > Acked-by: Felix Kuehling > Signed-off-by: Andrey Konovalov > --- Reviewed-by: Khalid Aziz > drivers/gpu/drm/radeon/radeon_gem.c | 2 ++ > 1 file changed, 2 insertions(+) >=20 > diff --git a/drivers/gpu/drm/radeon/radeon_gem.c b/drivers/gpu/drm/rade= on/radeon_gem.c > index 44617dec8183..90eb78fb5eb2 100644 > --- a/drivers/gpu/drm/radeon/radeon_gem.c > +++ b/drivers/gpu/drm/radeon/radeon_gem.c > @@ -291,6 +291,8 @@ int radeon_gem_userptr_ioctl(struct drm_device *dev= , void *data, > uint32_t handle; > int r; > =20 > + args->addr =3D untagged_addr(args->addr); > + > if (offset_in_page(args->addr | args->size)) > return -EINVAL; > =20 >=20