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Thu, 25 Feb 2021 16:54:09 +0000 Subject: Re: [Linaro-mm-sig] [PATCH 1/2] dma-buf: Require VM_PFNMAP vma for mmap To: Daniel Vetter , =?UTF-8?Q?Christian_K=c3=b6nig?= Cc: =?UTF-8?Q?Thomas_Hellstr=c3=b6m_=28Intel=29?= , Intel Graphics Development , Matthew Wilcox , "moderated list:DMA BUFFER SHARING FRAMEWORK" , Jason Gunthorpe , John Stultz , DRI Development , Daniel Vetter , Suren Baghdasaryan , "open list:DMA BUFFER SHARING FRAMEWORK" References: <20210223105951.912577-1-daniel.vetter@ffwll.ch> <1a7c2295-6241-f2bf-4a78-6cadd43bc248@shipmail.org> From: =?UTF-8?Q?Christian_K=c3=b6nig?= Message-ID: <432a0da0-ff0e-9b2b-4aee-13f20522fee3@amd.com> Date: Thu, 25 Feb 2021 17:53:53 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US X-Originating-IP: [2a02:908:1252:fb60:7944:296:6ad0:31ef] X-ClientProxiedBy: AM3PR07CA0099.eurprd07.prod.outlook.com (2603:10a6:207:6::33) To MN2PR12MB3775.namprd12.prod.outlook.com (2603:10b6:208:159::19) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from [IPv6:2a02:908:1252:fb60:7944:296:6ad0:31ef] (2a02:908:1252:fb60:7944:296:6ad0:31ef) by AM3PR07CA0099.eurprd07.prod.outlook.com (2603:10a6:207:6::33) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3912.9 via Frontend Transport; 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X-MS-Exchange-AntiSpam-MessageData: =?utf-8?B?UXRwY3pVTUpPOGxqMWJiK3dJbTBxQTBqdzc2a2VHdWNWRVFoN1h2ZHNxSFhX?= =?utf-8?B?bnYxdWpZVytpQWRWYlhseVhBSWcwU05Eb3krM1c2WDVJMWhvS0M4Y2ZDUlJn?= =?utf-8?B?MkNmRWxKME9QMTZLYysvVG5aNnVmREZNdld5em9pRW1kNGlkVlQ4ZDlOWHZs?= =?utf-8?B?QmJMOENSNEZ4dmdrQXczZmg0UHZ1WDVqNnFveEwrRnNFbzduczQ2WE9mUnhB?= =?utf-8?B?VFdpUGFpb2NqcXRldkpqVHlSeWpQa0xnSWF1M2FUaDh2d1FsYjBEdnVNdU1D?= =?utf-8?B?Q2U4Sm9ZOHVjMXV5TXI0OTZlRGMvZjhOKzhVWGM5RENaWFNGS1dqcDdPNVdI?= =?utf-8?B?OGR1d3RXL0RuN1hERnEvTzkveGpCaFFSWTFkQVcwWTNkb3FUSVg4NDMrR0Iv?= =?utf-8?B?dHM2YW9mSysvMUhteGQvOXNzWk84eks2UEdNaTNPdjZ6Q2FqSTcvMFdGenhM?= =?utf-8?B?d1VSL0JxdHZvSEM5UXNjQWNQN3JPUXUvVTZpblJjLzBweUxXRWVJdXdmUHZa?= =?utf-8?B?b3pXV3lRMnB2MC9BRGJSbUMwcS9BY1hrYUVsNFR0bzR3RzhKdkhJRHk1WjhG?= =?utf-8?B?WlpVejJCWHkxbHJ3bDU2NW9FL2VZbXhqeFVOSGg0bUdnQmlKQWxLbzVZQjRV?= =?utf-8?B?QUNTdlJHelc3cGFJVVQyeHcwdURJeDUzQmhxck8wOGtkYXJVZEhlVlNodGRO?= =?utf-8?B?ZElSVWxpRWZWNHZPSkZyTnZFV3dhU0FOejB3YXhlUnhOVHNCTEZvUHlabi80?= =?utf-8?B?QmhOcHlCL1UvS29LOXJ1VHl4b2JobHpMNGJFcjNzVmVVWlg3RkZIcFlQUnF0?= =?utf-8?B?WG4zY2lvUFNMVCtTU2ZWVEx2WWdvb21lM1RhWVpheEt5NGdOL0h2QTY5eG1K?= =?utf-8?B?T1hFVTJ5VDVsSFU5M082djgyTTJOdzBsWEdrTTdQQzVKSjZVaUlIczVGL2lD?= =?utf-8?B?SGJqRlAweG1uT3dlMkVXK2pKUlpyY1d1ZDJ0N1BtcGxpTVNpbE81dnFCd2h6?= =?utf-8?B?dXphN1UvUjlubkl1Vzd0aWdXZ3dwZUFqMGZuUHhRZ3BycnJ6RjRpeVBod1RI?= =?utf-8?B?Mk5Ec2pFS2R0S0I5VnJLZThYK05pTmFDb0VZaEJjcm9VVno0cXYwYWRObHRB?= =?utf-8?B?d0JhWDVybDkxaG1lbXJJTHJPYWY0ZFpNYk42ZDB0WHBCVGp5OThqMU5SRm81?= =?utf-8?B?L1lKcXhhYW9WZEx4MmhHcXpQdER1RXJFRHlJcVBOUkRSb1A0dy9BRTd6a29Z?= =?utf-8?B?elRDZkVtRGxRbUQraWtPeVdkbTYrRFBLcUVSTURrMGJ2ZUVFWXF6VmovT0FT?= =?utf-8?B?YnZPbUs2M2pHZlpDM0o3ZjZmRzJHWUdBNXdWSUhtQVlNdjJqUFJmSkdQWGlh?= =?utf-8?B?NVRiZnF2UGVjV2NRN0ZhYlRGcElROUx4N0dLQ3pOSGNQVWdFZlFTYjdoNFRT?= =?utf-8?B?SjAxV1ZjZlFadUJMVjNHL2ZuRytsOEJGbWZBTithZ1JqcDNtQ04zblF6NWVh?= =?utf-8?B?VmFWcWo3OWt4NG9jeEpOOFM4c1FuazlKNDZ0VkowMHZ3R28yWFdxemdYMnhT?= =?utf-8?B?ZHBhWWpmSW11QUVoUG5ESWMzd0tvTGQ5MXF1eDNjZ20wTlo4QjVVQUJqalE5?= =?utf-8?B?ZXQ2elZpZjk0R0YxNEMxQ244SVBhVmdqWVZPNGpMZ29jd3MwQUxpVGdmR0hi?= =?utf-8?B?VVZaYXZOOHRsbHB4ZWcrWlJDc24wc2ZJTWlDQjcrUWNWMkFlR0VWY1pIeldB?= =?utf-8?B?OWtBQUQ3cEcxZlA1ZEhDc09qWjJtY1BkZW50dmxncEdIdDlhMGordWdBWXkw?= =?utf-8?B?c01YVlcwTVVVSEFOV2JoQW41WUozTjdGc01vUUNISGNUdEdsQytYN2RJejky?= =?utf-8?Q?CUyK6d7ekGDj7?= X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-Network-Message-Id: 9dbbf5a3-93c2-4635-2d79-08d8d9adf7e6 X-MS-Exchange-CrossTenant-AuthSource: MN2PR12MB3775.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 25 Feb 2021 16:54:08.9829 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: 9ZHOEu96unWEP/F+FJYtlnc6MMiTw2jS4ntwIUTjvCaNY9l/dQxAwOtTOQy/pmOn X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR12MB4255 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Am 25.02.21 um 16:49 schrieb Daniel Vetter: > On Thu, Feb 25, 2021 at 11:44 AM Daniel Vetter wrote: >> On Thu, Feb 25, 2021 at 11:28:31AM +0100, Christian König wrote: >>> Am 24.02.21 um 10:31 schrieb Daniel Vetter: >>>> On Wed, Feb 24, 2021 at 10:16 AM Thomas Hellström (Intel) >>>> wrote: >>>>> On 2/24/21 9:45 AM, Daniel Vetter wrote: >>>>>> On Wed, Feb 24, 2021 at 8:46 AM Thomas Hellström (Intel) >>>>>> wrote: >>>>>>> On 2/23/21 11:59 AM, Daniel Vetter wrote: >>>>>>>> tldr; DMA buffers aren't normal memory, expecting that you can use >>>>>>>> them like that (like calling get_user_pages works, or that they're >>>>>>>> accounting like any other normal memory) cannot be guaranteed. >>>>>>>> >>>>>>>> Since some userspace only runs on integrated devices, where all >>>>>>>> buffers are actually all resident system memory, there's a huge >>>>>>>> temptation to assume that a struct page is always present and useable >>>>>>>> like for any more pagecache backed mmap. This has the potential to >>>>>>>> result in a uapi nightmare. >>>>>>>> >>>>>>>> To stop this gap require that DMA buffer mmaps are VM_PFNMAP, which >>>>>>>> blocks get_user_pages and all the other struct page based >>>>>>>> infrastructure for everyone. In spirit this is the uapi counterpart to >>>>>>>> the kernel-internal CONFIG_DMABUF_DEBUG. >>>>>>>> >>>>>>>> Motivated by a recent patch which wanted to swich the system dma-buf >>>>>>>> heap to vm_insert_page instead of vm_insert_pfn. >>>>>>>> >>>>>>>> v2: >>>>>>>> >>>>>>>> Jason brought up that we also want to guarantee that all ptes have the >>>>>>>> pte_special flag set, to catch fast get_user_pages (on architectures >>>>>>>> that support this). Allowing VM_MIXEDMAP (like VM_SPECIAL does) would >>>>>>>> still allow vm_insert_page, but limiting to VM_PFNMAP will catch that. >>>>>>>> >>>>>>>> From auditing the various functions to insert pfn pte entires >>>>>>>> (vm_insert_pfn_prot, remap_pfn_range and all it's callers like >>>>>>>> dma_mmap_wc) it looks like VM_PFNMAP is already required anyway, so >>>>>>>> this should be the correct flag to check for. >>>>>>>> >>>>>>> If we require VM_PFNMAP, for ordinary page mappings, we also need to >>>>>>> disallow COW mappings, since it will not work on architectures that >>>>>>> don't have CONFIG_ARCH_HAS_PTE_SPECIAL, (see the docs for vm_normal_page()). >>>>>> Hm I figured everyone just uses MAP_SHARED for buffer objects since >>>>>> COW really makes absolutely no sense. How would we enforce this? >>>>> Perhaps returning -EINVAL on is_cow_mapping() at mmap time. Either that >>>>> or allowing MIXEDMAP. >>>>> >>>>>>> Also worth noting is the comment in ttm_bo_mmap_vma_setup() with >>>>>>> possible performance implications with x86 + PAT + VM_PFNMAP + normal >>>>>>> pages. That's a very old comment, though, and might not be valid anymore. >>>>>> I think that's why ttm has a page cache for these, because it indeed >>>>>> sucks. The PAT changes on pages are rather expensive. >>>>> IIRC the page cache was implemented because of the slowness of the >>>>> caching mode transition itself, more specifically the wbinvd() call + >>>>> global TLB flush. >>> Yes, exactly that. The global TLB flush is what really breaks our neck here >>> from a performance perspective. >>> >>>>>> There is still an issue for iomem mappings, because the PAT validation >>>>>> does a linear walk of the resource tree (lol) for every vm_insert_pfn. >>>>>> But for i915 at least this is fixed by using the io_mapping >>>>>> infrastructure, which does the PAT reservation only once when you set >>>>>> up the mapping area at driver load. >>>>> Yes, I guess that was the issue that the comment describes, but the >>>>> issue wasn't there with vm_insert_mixed() + VM_MIXEDMAP. >>>>> >>>>>> Also TTM uses VM_PFNMAP right now for everything, so it can't be a >>>>>> problem that hurts much :-) >>>>> Hmm, both 5.11 and drm-tip appears to still use MIXEDMAP? >>>>> >>>>> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Felixir.bootlin.com%2Flinux%2Flatest%2Fsource%2Fdrivers%2Fgpu%2Fdrm%2Fttm%2Fttm_bo_vm.c%23L554&data=04%7C01%7Cchristian.koenig%40amd.com%7Ca93d0dbbc0484fec118808d8d9a4fc22%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637498649935442516%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=7%2BO0WNdBF62eVDy7u4hRydsfviF6dBJEDeZiYIzQAcc%3D&reserved=0 >>>> Uh that's bad, because mixed maps pointing at struct page wont stop >>>> gup. At least afaik. >>> Hui? I'm pretty sure MIXEDMAP stops gup as well. Otherwise we would have >>> already seen tons of problems with the page cache. >> On any architecture which has CONFIG_ARCH_HAS_PTE_SPECIAL vm_insert_mixed >> boils down to vm_insert_pfn wrt gup. And special pte stops gup fast path. >> >> But if you don't have VM_IO or VM_PFNMAP set, then I'm not seeing how >> you're stopping gup slow path. See check_vma_flags() in mm/gup.c. >> >> Also if you don't have CONFIG_ARCH_HAS_PTE_SPECIAL then I don't think >> vm_insert_mixed even works on iomem pfns. There's the devmap exception, >> but we're not devmap. Worse ttm abuses some accidental codepath to smuggle >> in hugepte support by intentionally not being devmap. >> >> So I'm really not sure this works as we think it should. Maybe good to do >> a quick test program on amdgpu with a buffer in system memory only and try >> to do direct io into it. If it works, you have a problem, and a bad one. > That's probably impossible, since a quick git grep shows that pretty > much anything reasonable has special ptes: arc, arm, arm64, powerpc, > riscv, s390, sh, sparc, x86. I don't think you'll have a platform > where you can plug an amdgpu in and actually exercise the bug :-) > > So maybe we should just switch over to VM_PFNMAP for ttm for more clarity? Maybe yes, but not sure. I've once had a request to do this from some google guys, but rejected it because I wasn't sure of the consequences. Christian. > -Daniel > > >>> Regards, >>> Christian. >>> >>>> Christian, do we need to patch this up, and maybe fix up ttm fault >>>> handler to use io_mapping so the vm_insert_pfn stuff is fast? >>>> -Daniel >> -- >> Daniel Vetter >> Software Engineer, Intel Corporation >> https://nam11.safelinks.protection.outlook.com/?url=http%3A%2F%2Fblog.ffwll.ch%2F&data=04%7C01%7Cchristian.koenig%40amd.com%7Ca93d0dbbc0484fec118808d8d9a4fc22%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637498649935442516%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=PmdIbYM6kemXstScf2OoZU9YyXGGzzNzeWEyL8ZDnfo%3D&reserved=0 > > 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=-5.5 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, 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