From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dmitry Osipenko Subject: Re: [PATCH 04/10] gpu: host1x: Lock classes during job submission Date: Tue, 5 Dec 2017 16:43:27 +0300 Message-ID: <13306780-4a59-dda0-bf46-ecdf92d66e14@gmail.com> References: <20171105110118.15142-1-mperttunen@nvidia.com> <20171105110118.15142-5-mperttunen@nvidia.com> <97ce4873-fdc1-5197-17bc-74505beadfc4@gmail.com> <2b4d9283-dabe-9e1f-f8cb-6ddbc16e3f0f@kapsi.fi> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Return-path: In-Reply-To: <2b4d9283-dabe-9e1f-f8cb-6ddbc16e3f0f-/1wQRMveznE@public.gmane.org> Content-Language: en-US Sender: linux-tegra-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Mikko Perttunen , Mikko Perttunen , thierry.reding-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, jonathanh-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org Cc: dri-devel-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org, linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: dri-devel@lists.freedesktop.org On 05.12.2017 16:21, Mikko Perttunen wrote: > On 07.11.2017 23:23, Dmitry Osipenko wrote: >> On 07.11.2017 15:28, Mikko Perttunen wrote: >>> On 05.11.2017 18:46, Dmitry Osipenko wrote: >>>> On 05.11.2017 14:01, Mikko Perttunen wrote: >>>>> ... >>>>> >>>>> +static int mlock_id_for_class(unsigned int class) >>>>> +{ >>>>> +#if HOST1X_HW >= 6 >>>>> +    switch (class) >>>>> +    { >>>>> +    case HOST1X_CLASS_HOST1X: >>>>> +        return 0; >>>>> +    case HOST1X_CLASS_VIC: >>>>> +        return 17; >>>> >>>> What is the meaning of returned ID values that you have defined here? Why VIC >>>> should have different ID on T186? >>> >>> On T186, MLOCKs are not "generic" - the HW knows that each MLOCK corresponds to >>> a specific class. Therefore we must map that correctly. >>> >> >> Okay. >> >>>> >>>>> +    default: >>>>> +        return -EINVAL; >>>>> +    } >>>>> +#else >>>>> +    switch (class) >>>>> +    { >>>>> +    case HOST1X_CLASS_HOST1X: >>>>> +        return 0; >>>>> +    case HOST1X_CLASS_GR2D: >>>>> +        return 1; >>>>> +    case HOST1X_CLASS_GR2D_SB: >>>>> +        return 2; >>>> >>>> Note that we are allowing to switch 2d classes in the same jobs context and >>>> currently jobs class is somewhat hardcoded to GR2D. >>>> >>>> Even though that GR2D and GR2D_SB use different register banks, is it okay to >>>> trigger execution of different classes simultaneously? Would syncpoint >>>> differentiate classes on OP_DONE event? >>> >>> Good point, we might need to use the same lock for these two. >>> >>>> >>>> I suppose that MLOCK (the module lock) implies the whole module locking, >>>> wouldn't it make sense to just use the module ID's defined in the TRM? >>> >>> Can you point out where these are defined? >> >> See INDMODID / REGF_MODULEID fields of HOST1X_CHANNEL_INDOFF2_0 / >> HOST1X_SYNC_REGF_ADDR_0 registers, bit numbers of HOST1X_SYNC_INTSTATUS_0 / >> HOST1X_SYNC_INTC0MASK_0 / HOST1X_SYNC_MOD_TEARDOWN_0. > > These values look like they would work on T20, but at least on T124 the module > numbering for modules we want to lock goes above the number of MLOCKs so the > indexing scheme would not work there.. > Indeed, for some reason I was thinking that there are 32 MLOCK's instead of 16.