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Wed, 26 May 2021 13:23:08 +0000 Subject: Re: [Intel-gfx] [PATCH 5/7] dma-buf: Add an API for exporting sync files (v11) To: Daniel Stone References: <20210525211753.1086069-1-jason@jlekstrand.net> <20210525211753.1086069-6-jason@jlekstrand.net> <770eb698-1dde-9e46-da83-44911d96abec@amd.com> From: =?UTF-8?Q?Christian_K=c3=b6nig?= Message-ID: Date: Wed, 26 May 2021 15:23:01 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.8.1 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:fb60:1950:35e:cae9:5bed] X-ClientProxiedBy: AM0PR03CA0004.eurprd03.prod.outlook.com (2603:10a6:208:14::17) 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:fb60:1950:35e:cae9:5bed] (2a02:908:1252:fb60:1950:35e:cae9:5bed) by AM0PR03CA0004.eurprd03.prod.outlook.com (2603:10a6:208:14::17) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4173.20 via Frontend Transport; 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Like, if we pass >>> an unmaterialised syncobj+val here to insert into the resv, then an >>> implicit-only media user (or KMS) goes to sync against the resv, what >>> happens? >> Well this is for exporting, not importing. So we don't need to worry >> about that. >> >> It's just my thinking because the drm_syncobj is the backing object on >> VkSemaphore implementations these days, isn't it? > Yeah, I can see that to an extent. But then binary vs. timeline > syncobjs are very different in use (which is unfortunate tbh), and > then we have an asymmetry between syncobj export & sync_file import. > > You're right that we do want a syncobj though. This is probably not > practical due to smashing uAPI to bits, but if we could wind the clock > back a couple of years, I suspect the interface we want is that export > can either export a sync_file or a binary syncobj, and further that > binary syncobjs could transparently act as timeline semaphores by > mapping any value (either wait or signal) to the binary signal. In > hindsight, we should probably just never have had binary syncobj. Oh > well. Well the later is the case IIRC. Don't ask me for the detail semantics, but in general the drm_syncobj in timeline mode is compatible to the binary mode. The sync_file is also import/exportable to a certain drm_syncobj timeline point (or as binary signal). So no big deal, we are all compatible here :) I just thought that it might be more appropriate to return a drm_syncobj directly instead of a sync_file. Regards, Christian. > > Cheers, > Daniel