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[212.51.149.96]) by smtp.gmail.com with ESMTPSA id q6sm20672730wrx.30.2019.11.05.01.43.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 05 Nov 2019 01:43:01 -0800 (PST) Date: Tue, 5 Nov 2019 10:42:59 +0100 From: Daniel Vetter To: John Stultz Cc: Daniel Vetter , lkml , Sandeep Patil , Mike Rapoport , Chenbo Feng , Alistair Strachan , Liam Mark , Yue Hu , dri-devel , "Andrew F . Davis" , Hridya Valsaraju , Andrew Morton , Pratik Patel Subject: Re: [RFC][PATCH 0/2] Allow DMA BUF heaps to be loaded as modules Message-ID: <20191105094259.GX10326@phenom.ffwll.local> Mail-Followup-To: John Stultz , lkml , Sandeep Patil , Mike Rapoport , Chenbo Feng , Alistair Strachan , Liam Mark , Yue Hu , dri-devel , "Andrew F . Davis" , Hridya Valsaraju , Andrew Morton , Pratik Patel References: <20191025234834.28214-1-john.stultz@linaro.org> <20191104095823.GD10326@phenom.ffwll.local> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Operating-System: Linux phenom 5.2.0-3-amd64 User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Nov 04, 2019 at 10:57:44AM -0800, John Stultz wrote: > On Mon, Nov 4, 2019 at 1:58 AM Daniel Vetter wrote: > > On Fri, Oct 25, 2019 at 11:48:32PM +0000, John Stultz wrote: > > > Now that the DMA BUF heaps core code has been queued, I wanted > > > to send out some of the pending changes that I've been working > > > on. > > > > > > For use with Android and their GKI effort, it is desired that > > > DMA BUF heaps are able to be loaded as modules. This is required > > > for migrating vendors off of ION which was also recently changed > > > to support modules. > > > > > > So this patch series simply provides the necessary exported > > > symbols and allows the system and CMA drivers to be built > > > as modules. > > > > > > Due to the fact that dmabuf's allocated from a heap may > > > be in use for quite some time, there isn't a way to safely > > > unload the driver once it has been loaded. Thus these > > > drivers do no implement module_exit() functions and will > > > show up in lsmod as "[permanent]" > > > > > > Feedback and thoughts on this would be greatly appreciated! > > > > Do we actually want this? > > I guess that always depends on the definition of "we" :) > > > I figured if we just state that vendors should set up all the right > > dma-buf heaps in dt, is that not enough? > > So even if the heaps are configured via DT (which at the moment there > is no such binding, so that's not really a valid method yet), there's > still the question of if the heap is necessary/makes sense on the > device. And the DT would only control the availability of the heap > interface, not if the heap driver is loaded or not. Hm I thought the cma regions are configured in DT? How does that work if it's not using DT? > On the HiKey/HiKey960 boards, we have to allocate contiguous buffers > for the display framebuffer. So gralloc uses ION to allocate from the > CMA heap. However on the db845c, it has no such restrictions, so the > CMA heap isn't necessary. Why do you have a CMA region for the 2nd board if you don't need it? _That_ sounds like some serious memory waster, not a few lines of code loaded for nothing :-) > With Android's GKI effort, there needs to be one kernel that works on > all the devices, and they are using modules to try to minimize the > amount of memory spent on functionality that isn't universally needed. > So on devices that don't need the CMA heap, they'd probably prefer not > to load the CMA dmabuf heap driver, so it would be best if it could be > built as a module. If we want to build the CMA heap as a module, the > symbols it uses need to be exported. Yeah, I guess I'm disagreeing on whether dma-buf heaps are core or not. > > Exporting symbols for no real in-tree users feels fishy. > > I'm submitting an in-tree user here. So I'm not sure what you mean? I > suspect you're thinking there is some hidden/nefarious plan here, but > really there isn't. I was working under the assumption that you're only exporting the symbols for other heaps, and keep the current ones in-tree. Are there even any out-of-tree dma-buf heaps still? out-of-tree and legit different use-case I mean ofc, not just out-of-tree because inertia :-) -Daniel -- Daniel Vetter Software Engineer, Intel Corporation http://blog.ffwll.ch 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=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 34340C49EAD for ; Tue, 5 Nov 2019 09:43:06 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 0B473217F5 for ; Tue, 5 Nov 2019 09:43:06 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0B473217F5 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ffwll.ch Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 8E7296E97B; Tue, 5 Nov 2019 09:43:05 +0000 (UTC) Received: from mail-wr1-x442.google.com (mail-wr1-x442.google.com [IPv6:2a00:1450:4864:20::442]) by gabe.freedesktop.org (Postfix) with ESMTPS id 8E6556E97B for ; Tue, 5 Nov 2019 09:43:03 +0000 (UTC) Received: by mail-wr1-x442.google.com with SMTP id o28so20494734wro.7 for ; Tue, 05 Nov 2019 01:43:03 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:from:to:cc:subject:message-id :mail-followup-to:references:mime-version:content-disposition :in-reply-to:user-agent; bh=4/VJ6M2+7hwOEEdLHqHiPh0eW3cGFy3lItJn6scbrkU=; b=jgvgytEoLUqUcKuiPwIWj1BfMpzXb4OpgPjgIlfRjlTtQNXl5rS1iLipPb+B1HuAIS sjM/zFmcPG5cjylfS9i5YNcfRWIjf1+4lpsjoCV4+V0tfYAEe5pY1Q7wwYoHz3zYiDU2 1+Ua2bbaEIeViB2ToDjGG9LQi7XDHsi2FyTWdTaHX3lCTqNmCRCMrnL+31MDqpHdRTue OVKQwtm8yeQufHchKAnBi3w2DJ880JFRQ7SH7No31PSgxjDAhWzatD7eqnXppBfKJPTv UA/w/Dx5PY4mibI1ZBtIMdEEOApDweLK6xG7yaWXEstNfyLnkDB8aJFQlAINd4Zs6y2J dAeg== X-Gm-Message-State: APjAAAXTdZBuraCMnPmif/cdSsLlgbg0yYsDGgs8aOh5iwD41f+hxKGj V6lR3cPO/5kFPU7R6Ai0YMPtlw== X-Google-Smtp-Source: APXvYqzjhUTNVruYhgZfTmLkZ34XimMiuypNBa3cC7z8/2/Ifk+JRdi+Kaed6KOmzy91cnLXEvZNOg== X-Received: by 2002:adf:e682:: with SMTP id r2mr12546257wrm.358.1572946982169; Tue, 05 Nov 2019 01:43:02 -0800 (PST) Received: from phenom.ffwll.local (212-51-149-96.fiber7.init7.net. [212.51.149.96]) by smtp.gmail.com with ESMTPSA id q6sm20672730wrx.30.2019.11.05.01.43.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 05 Nov 2019 01:43:01 -0800 (PST) Date: Tue, 5 Nov 2019 10:42:59 +0100 From: Daniel Vetter To: John Stultz Subject: Re: [RFC][PATCH 0/2] Allow DMA BUF heaps to be loaded as modules Message-ID: <20191105094259.GX10326@phenom.ffwll.local> Mail-Followup-To: John Stultz , lkml , Sandeep Patil , Mike Rapoport , Chenbo Feng , Alistair Strachan , Liam Mark , Yue Hu , dri-devel , "Andrew F . 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Davis" , Hridya Valsaraju , Andrew Morton , Mike Rapoport , Pratik Patel Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Message-ID: <20191105094259.Ze1JSQVoLTWCpN2ngeEp3AEwyoCGEefk4rFPDznTVts@z> T24gTW9uLCBOb3YgMDQsIDIwMTkgYXQgMTA6NTc6NDRBTSAtMDgwMCwgSm9obiBTdHVsdHogd3Jv dGU6Cj4gT24gTW9uLCBOb3YgNCwgMjAxOSBhdCAxOjU4IEFNIERhbmllbCBWZXR0ZXIgPGRhbmll bEBmZndsbC5jaD4gd3JvdGU6Cj4gPiBPbiBGcmksIE9jdCAyNSwgMjAxOSBhdCAxMTo0ODozMlBN ICswMDAwLCBKb2huIFN0dWx0eiB3cm90ZToKPiA+ID4gTm93IHRoYXQgdGhlIERNQSBCVUYgaGVh cHMgY29yZSBjb2RlIGhhcyBiZWVuIHF1ZXVlZCwgSSB3YW50ZWQKPiA+ID4gdG8gc2VuZCBvdXQg c29tZSBvZiB0aGUgcGVuZGluZyBjaGFuZ2VzIHRoYXQgSSd2ZSBiZWVuIHdvcmtpbmcKPiA+ID4g b24uCj4gPiA+Cj4gPiA+IEZvciB1c2Ugd2l0aCBBbmRyb2lkIGFuZCB0aGVpciBHS0kgZWZmb3J0 LCBpdCBpcyBkZXNpcmVkIHRoYXQKPiA+ID4gRE1BIEJVRiBoZWFwcyBhcmUgYWJsZSB0byBiZSBs b2FkZWQgYXMgbW9kdWxlcy4gVGhpcyBpcyByZXF1aXJlZAo+ID4gPiBmb3IgbWlncmF0aW5nIHZl bmRvcnMgb2ZmIG9mIElPTiB3aGljaCB3YXMgYWxzbyByZWNlbnRseSBjaGFuZ2VkCj4gPiA+IHRv IHN1cHBvcnQgbW9kdWxlcy4KPiA+ID4KPiA+ID4gU28gdGhpcyBwYXRjaCBzZXJpZXMgc2ltcGx5 IHByb3ZpZGVzIHRoZSBuZWNlc3NhcnkgZXhwb3J0ZWQKPiA+ID4gc3ltYm9scyBhbmQgYWxsb3dz IHRoZSBzeXN0ZW0gYW5kIENNQSBkcml2ZXJzIHRvIGJlIGJ1aWx0Cj4gPiA+IGFzIG1vZHVsZXMu Cj4gPiA+Cj4gPiA+IER1ZSB0byB0aGUgZmFjdCB0aGF0IGRtYWJ1ZidzIGFsbG9jYXRlZCBmcm9t IGEgaGVhcCBtYXkKPiA+ID4gYmUgaW4gdXNlIGZvciBxdWl0ZSBzb21lIHRpbWUsIHRoZXJlIGlz bid0IGEgd2F5IHRvIHNhZmVseQo+ID4gPiB1bmxvYWQgdGhlIGRyaXZlciBvbmNlIGl0IGhhcyBi ZWVuIGxvYWRlZC4gVGh1cyB0aGVzZQo+ID4gPiBkcml2ZXJzIGRvIG5vIGltcGxlbWVudCBtb2R1 bGVfZXhpdCgpIGZ1bmN0aW9ucyBhbmQgd2lsbAo+ID4gPiBzaG93IHVwIGluIGxzbW9kIGFzICJb cGVybWFuZW50XSIKPiA+ID4KPiA+ID4gRmVlZGJhY2sgYW5kIHRob3VnaHRzIG9uIHRoaXMgd291 bGQgYmUgZ3JlYXRseSBhcHByZWNpYXRlZCEKPiA+Cj4gPiBEbyB3ZSBhY3R1YWxseSB3YW50IHRo aXM/Cj4gCj4gSSBndWVzcyB0aGF0IGFsd2F5cyBkZXBlbmRzIG9uIHRoZSBkZWZpbml0aW9uIG9m ICJ3ZSIgOikKPiAKPiA+IEkgZmlndXJlZCBpZiB3ZSBqdXN0IHN0YXRlIHRoYXQgdmVuZG9ycyBz aG91bGQgc2V0IHVwIGFsbCB0aGUgcmlnaHQKPiA+IGRtYS1idWYgaGVhcHMgaW4gZHQsIGlzIHRo YXQgbm90IGVub3VnaD8KPiAKPiBTbyBldmVuIGlmIHRoZSBoZWFwcyBhcmUgY29uZmlndXJlZCB2 aWEgRFQgKHdoaWNoIGF0IHRoZSBtb21lbnQgdGhlcmUKPiBpcyBubyBzdWNoIGJpbmRpbmcsIHNv IHRoYXQncyBub3QgcmVhbGx5IGEgdmFsaWQgbWV0aG9kIHlldCksIHRoZXJlJ3MKPiBzdGlsbCB0 aGUgcXVlc3Rpb24gb2YgaWYgdGhlIGhlYXAgaXMgbmVjZXNzYXJ5L21ha2VzIHNlbnNlIG9uIHRo ZQo+IGRldmljZS4gQW5kIHRoZSBEVCB3b3VsZCBvbmx5IGNvbnRyb2wgdGhlIGF2YWlsYWJpbGl0 eSBvZiB0aGUgaGVhcAo+IGludGVyZmFjZSwgbm90IGlmIHRoZSBoZWFwIGRyaXZlciBpcyBsb2Fk ZWQgb3Igbm90LgoKSG0gSSB0aG91Z2h0IHRoZSBjbWEgcmVnaW9ucyBhcmUgY29uZmlndXJlZCBp biBEVD8gSG93IGRvZXMgdGhhdCB3b3JrIGlmCml0J3Mgbm90IHVzaW5nIERUPwoKPiBPbiB0aGUg SGlLZXkvSGlLZXk5NjAgYm9hcmRzLCB3ZSBoYXZlIHRvIGFsbG9jYXRlIGNvbnRpZ3VvdXMgYnVm ZmVycwo+IGZvciB0aGUgZGlzcGxheSBmcmFtZWJ1ZmZlci4gU28gZ3JhbGxvYyB1c2VzIElPTiB0 byBhbGxvY2F0ZSBmcm9tIHRoZQo+IENNQSBoZWFwLiBIb3dldmVyIG9uIHRoZSBkYjg0NWMsIGl0 IGhhcyBubyBzdWNoIHJlc3RyaWN0aW9ucywgc28gdGhlCj4gQ01BIGhlYXAgaXNuJ3QgbmVjZXNz YXJ5LgoKV2h5IGRvIHlvdSBoYXZlIGEgQ01BIHJlZ2lvbiBmb3IgdGhlIDJuZCBib2FyZCBpZiB5 b3UgZG9uJ3QgbmVlZCBpdD8KX1RoYXRfIHNvdW5kcyBsaWtlIHNvbWUgc2VyaW91cyBtZW1vcnkg d2FzdGVyLCBub3QgYSBmZXcgbGluZXMgb2YgY29kZQpsb2FkZWQgZm9yIG5vdGhpbmcgOi0pCgo+ IFdpdGggQW5kcm9pZCdzIEdLSSBlZmZvcnQsIHRoZXJlIG5lZWRzIHRvIGJlIG9uZSBrZXJuZWwg dGhhdCB3b3JrcyBvbgo+IGFsbCB0aGUgZGV2aWNlcywgYW5kIHRoZXkgYXJlIHVzaW5nIG1vZHVs ZXMgdG8gdHJ5IHRvIG1pbmltaXplIHRoZQo+IGFtb3VudCBvZiBtZW1vcnkgc3BlbnQgb24gZnVu Y3Rpb25hbGl0eSB0aGF0IGlzbid0IHVuaXZlcnNhbGx5IG5lZWRlZC4KPiBTbyBvbiBkZXZpY2Vz IHRoYXQgZG9uJ3QgbmVlZCB0aGUgQ01BIGhlYXAsIHRoZXknZCBwcm9iYWJseSBwcmVmZXIgbm90 Cj4gdG8gbG9hZCB0aGUgQ01BIGRtYWJ1ZiBoZWFwIGRyaXZlciwgc28gaXQgd291bGQgYmUgYmVz dCBpZiBpdCBjb3VsZCBiZQo+IGJ1aWx0IGFzIGEgbW9kdWxlLiAgSWYgd2Ugd2FudCB0byBidWls ZCB0aGUgQ01BIGhlYXAgYXMgYSBtb2R1bGUsIHRoZQo+IHN5bWJvbHMgaXQgdXNlcyBuZWVkIHRv IGJlIGV4cG9ydGVkLgoKWWVhaCwgSSBndWVzcyBJJ20gZGlzYWdyZWVpbmcgb24gd2hldGhlciBk bWEtYnVmIGhlYXBzIGFyZSBjb3JlIG9yIG5vdC4KCj4gPiBFeHBvcnRpbmcgc3ltYm9scyBmb3Ig bm8gcmVhbCBpbi10cmVlIHVzZXJzIGZlZWxzIGZpc2h5Lgo+IAo+IEknbSBzdWJtaXR0aW5nIGFu IGluLXRyZWUgdXNlciBoZXJlLiBTbyBJJ20gbm90IHN1cmUgd2hhdCB5b3UgbWVhbj8gIEkKPiBz dXNwZWN0IHlvdSdyZSB0aGlua2luZyB0aGVyZSBpcyBzb21lIGhpZGRlbi9uZWZhcmlvdXMgcGxh biBoZXJlLCBidXQKPiByZWFsbHkgdGhlcmUgaXNuJ3QuCgpJIHdhcyB3b3JraW5nIHVuZGVyIHRo ZSBhc3N1bXB0aW9uIHRoYXQgeW91J3JlIG9ubHkgZXhwb3J0aW5nIHRoZSBzeW1ib2xzCmZvciBv dGhlciBoZWFwcywgYW5kIGtlZXAgdGhlIGN1cnJlbnQgb25lcyBpbi10cmVlLiBBcmUgdGhlcmUg ZXZlbiBhbnkKb3V0LW9mLXRyZWUgZG1hLWJ1ZiBoZWFwcyBzdGlsbD8gb3V0LW9mLXRyZWUgYW5k IGxlZ2l0IGRpZmZlcmVudCB1c2UtY2FzZQpJIG1lYW4gb2ZjLCBub3QganVzdCBvdXQtb2YtdHJl ZSBiZWNhdXNlIGluZXJ0aWEgOi0pCi1EYW5pZWwKLS0gCkRhbmllbCBWZXR0ZXIKU29mdHdhcmUg RW5naW5lZXIsIEludGVsIENvcnBvcmF0aW9uCmh0dHA6Ly9ibG9nLmZmd2xsLmNoCl9fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fCmRyaS1kZXZlbCBtYWlsaW5n IGxpc3QKZHJpLWRldmVsQGxpc3RzLmZyZWVkZXNrdG9wLm9yZwpodHRwczovL2xpc3RzLmZyZWVk ZXNrdG9wLm9yZy9tYWlsbWFuL2xpc3RpbmZvL2RyaS1kZXZlbA==