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Tue, 7 May 2019 16:44:02 +0000 Received: from BYAPR12MB3176.namprd12.prod.outlook.com ([fe80::9118:73f2:809c:22c7]) by BYAPR12MB3176.namprd12.prod.outlook.com ([fe80::9118:73f2:809c:22c7%4]) with mapi id 15.20.1856.012; Tue, 7 May 2019 16:44:02 +0000 From: "Kuehling, Felix" 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" Subject: Re: [PATCH v15 12/17] drm/radeon, arm64: untag user pointers in radeon_gem_userptr_ioctl Thread-Topic: [PATCH v15 12/17] drm/radeon, arm64: untag user pointers in radeon_gem_userptr_ioctl Thread-Index: AQHVBCkzLfkJvfOc9kqyclyg05ajP6Zf386A Date: Tue, 7 May 2019 16:44:02 +0000 Message-ID: <7568118b-ad57-156c-464f-54fb3f90a783@amd.com> References: <03fe9d923db75cf72678f3ce103838e67390751a.1557160186.git.andreyknvl@google.com> In-Reply-To: <03fe9d923db75cf72678f3ce103838e67390751a.1557160186.git.andreyknvl@google.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [165.204.55.251] user-agent: Mozilla/5.0 (X11; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 2019-05-06 12:30 p.m., Andrey Konovalov wrote: > [CAUTION: External Email] > > This patch is a part of a series that extends arm64 kernel ABI to allow to > pass tagged user pointers (with the top byte set to something else other > than 0x00) as syscall arguments. > > 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 right > 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. > > This patch untags user pointers in radeon_gem_userptr_ioctl(). > > Signed-off-by: Andrey Konovalov Acked-by: Felix Kuehling > --- > drivers/gpu/drm/radeon/radeon_gem.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/drivers/gpu/drm/radeon/radeon_gem.c b/drivers/gpu/drm/radeon/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; > > + args->addr = untagged_addr(args->addr); > + > if (offset_in_page(args->addr | args->size)) > return -EINVAL; > > -- > 2.21.0.1020.gf2820cf01a-goog > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel