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[212.51.149.96]) by smtp.gmail.com with ESMTPSA id f8sm15010707wmb.37.2019.11.04.01.58.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 04 Nov 2019 01:58:25 -0800 (PST) Date: Mon, 4 Nov 2019 10:58:23 +0100 From: Daniel Vetter To: John Stultz Cc: lkml , Sandeep Patil , Mike Rapoport , Chenbo Feng , Alistair Strachan , Liam Mark , Yue Hu , dri-devel@lists.freedesktop.org, "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: <20191104095823.GD10326@phenom.ffwll.local> Mail-Followup-To: John Stultz , lkml , Sandeep Patil , Mike Rapoport , Chenbo Feng , Alistair Strachan , Liam Mark , Yue Hu , dri-devel@lists.freedesktop.org, "Andrew F . Davis" , Hridya Valsaraju , Andrew Morton , Pratik Patel References: <20191025234834.28214-1-john.stultz@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20191025234834.28214-1-john.stultz@linaro.org> 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 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 figured if we just state that vendors should set up all the right dma-buf heaps in dt, is that not enough? Exporting symbols for no real in-tree users feels fishy. -Daniel > > thanks > -john > > Cc: Laura Abbott > Cc: Benjamin Gaignard > Cc: Sumit Semwal > Cc: Liam Mark > Cc: Pratik Patel > Cc: Brian Starkey > Cc: Andrew F. Davis > Cc: Andrew Morton > Cc: Yue Hu > Cc: Mike Rapoport > Cc: Chenbo Feng > Cc: Alistair Strachan > Cc: Sandeep Patil > Cc: Hridya Valsaraju > Cc: dri-devel@lists.freedesktop.org > > John Stultz (1): > dma-buf: heaps: Allow system & cma heaps to be configured as a modules > > Sandeep Patil (1): > mm: cma: Export cma symbols for cma heap as a module > > drivers/dma-buf/dma-heap.c | 2 ++ > drivers/dma-buf/heaps/Kconfig | 4 ++-- > drivers/dma-buf/heaps/heap-helpers.c | 2 ++ > kernel/dma/contiguous.c | 1 + > mm/cma.c | 5 +++++ > 5 files changed, 12 insertions(+), 2 deletions(-) > > -- > 2.17.1 > > _______________________________________________ > dri-devel mailing list > dri-devel@lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/dri-devel -- 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 43918CA9ED3 for ; Mon, 4 Nov 2019 09:58:30 +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 2428B222D0 for ; Mon, 4 Nov 2019 09:58:30 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2428B222D0 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 77FEA6E25B; Mon, 4 Nov 2019 09:58:29 +0000 (UTC) Received: from mail-wr1-x444.google.com (mail-wr1-x444.google.com [IPv6:2a00:1450:4864:20::444]) by gabe.freedesktop.org (Postfix) with ESMTPS id A7EB06E25B for ; Mon, 4 Nov 2019 09:58:27 +0000 (UTC) Received: by mail-wr1-x444.google.com with SMTP id a15so16242596wrf.9 for ; Mon, 04 Nov 2019 01:58:27 -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=A8BaA51G7E0NuLYNihqbtlcJ9Y7+alqjRVepHAHLBmg=; b=j2hqZgYp1vlvNcE7BvIa7NLtteHPckZrvTuPnR10Y7vKP/EsK6qgVU/KVvq5csrNe4 yNws0mCixCUCVm77uWhD6ncSUHAXGSHh16p3QslgbBfin8aBJ7EGn+STI+5DvYbYjrKZ HR8dPE7nWVgZ084wNJYy1lSj03c28h+C3KH4gMdKdjnLMrw1/Z1ShUJi/nM0KsOQKmdD iY16RYbdDzlVb50dKHuWAuWBaIM6Zsg9SjTnbHAo/8ctnZFk/m+6PXQ+YGJEnk2uO+RM P1wWBILRwEutRG6vN1ykTkzPG2YTuVc16bS43pjm0r4X8B5V7FLh4t1DRIvcja4YB7r7 u2rQ== X-Gm-Message-State: APjAAAXtSOb38hxXtout3k0qCxduNs4YIhNDaP50Eb9P3T6FekO5uKKr k9hXwFXvGlz8ANlZDsvMfSGcoTYRzHo= X-Google-Smtp-Source: APXvYqx9gMlx/nBYQFJiLnGM9utCwN2hlK4THSUfl6NdFdMdlr5+BJ1KBbr5s2fd9PdJySs05lgvLw== X-Received: by 2002:a5d:5587:: with SMTP id i7mr22853426wrv.289.1572861506141; Mon, 04 Nov 2019 01:58:26 -0800 (PST) Received: from phenom.ffwll.local (212-51-149-96.fiber7.init7.net. 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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: <20191104095823.sOFc_zXCfzBu8rnYRGQrWYQ9bDbsLLcmu2Nlvlr8ntM@z> T24gRnJpLCBPY3QgMjUsIDIwMTkgYXQgMTE6NDg6MzJQTSArMDAwMCwgSm9obiBTdHVsdHogd3Jv dGU6Cj4gTm93IHRoYXQgdGhlIERNQSBCVUYgaGVhcHMgY29yZSBjb2RlIGhhcyBiZWVuIHF1ZXVl ZCwgSSB3YW50ZWQKPiB0byBzZW5kIG91dCBzb21lIG9mIHRoZSBwZW5kaW5nIGNoYW5nZXMgdGhh dCBJJ3ZlIGJlZW4gd29ya2luZwo+IG9uLgo+IAo+IEZvciB1c2Ugd2l0aCBBbmRyb2lkIGFuZCB0 aGVpciBHS0kgZWZmb3J0LCBpdCBpcyBkZXNpcmVkIHRoYXQKPiBETUEgQlVGIGhlYXBzIGFyZSBh YmxlIHRvIGJlIGxvYWRlZCBhcyBtb2R1bGVzLiBUaGlzIGlzIHJlcXVpcmVkCj4gZm9yIG1pZ3Jh dGluZyB2ZW5kb3JzIG9mZiBvZiBJT04gd2hpY2ggd2FzIGFsc28gcmVjZW50bHkgY2hhbmdlZAo+ IHRvIHN1cHBvcnQgbW9kdWxlcy4KPiAKPiBTbyB0aGlzIHBhdGNoIHNlcmllcyBzaW1wbHkgcHJv dmlkZXMgdGhlIG5lY2Vzc2FyeSBleHBvcnRlZAo+IHN5bWJvbHMgYW5kIGFsbG93cyB0aGUgc3lz dGVtIGFuZCBDTUEgZHJpdmVycyB0byBiZSBidWlsdAo+IGFzIG1vZHVsZXMuCj4gCj4gRHVlIHRv IHRoZSBmYWN0IHRoYXQgZG1hYnVmJ3MgYWxsb2NhdGVkIGZyb20gYSBoZWFwIG1heQo+IGJlIGlu IHVzZSBmb3IgcXVpdGUgc29tZSB0aW1lLCB0aGVyZSBpc24ndCBhIHdheSB0byBzYWZlbHkKPiB1 bmxvYWQgdGhlIGRyaXZlciBvbmNlIGl0IGhhcyBiZWVuIGxvYWRlZC4gVGh1cyB0aGVzZQo+IGRy aXZlcnMgZG8gbm8gaW1wbGVtZW50IG1vZHVsZV9leGl0KCkgZnVuY3Rpb25zIGFuZCB3aWxsCj4g c2hvdyB1cCBpbiBsc21vZCBhcyAiW3Blcm1hbmVudF0iCj4gCj4gRmVlZGJhY2sgYW5kIHRob3Vn aHRzIG9uIHRoaXMgd291bGQgYmUgZ3JlYXRseSBhcHByZWNpYXRlZCEKCkRvIHdlIGFjdHVhbGx5 IHdhbnQgdGhpcz8KCkkgZmlndXJlZCBpZiB3ZSBqdXN0IHN0YXRlIHRoYXQgdmVuZG9ycyBzaG91 bGQgc2V0IHVwIGFsbCB0aGUgcmlnaHQKZG1hLWJ1ZiBoZWFwcyBpbiBkdCwgaXMgdGhhdCBub3Qg ZW5vdWdoPwoKRXhwb3J0aW5nIHN5bWJvbHMgZm9yIG5vIHJlYWwgaW4tdHJlZSB1c2VycyBmZWVs cyBmaXNoeS4KLURhbmllbAoKPiAKPiB0aGFua3MKPiAtam9obgo+IAo+IENjOiBMYXVyYSBBYmJv dHQgPGxhYmJvdHRAcmVkaGF0LmNvbT4KPiBDYzogQmVuamFtaW4gR2FpZ25hcmQgPGJlbmphbWlu LmdhaWduYXJkQGxpbmFyby5vcmc+Cj4gQ2M6IFN1bWl0IFNlbXdhbCA8c3VtaXQuc2Vtd2FsQGxp bmFyby5vcmc+Cj4gQ2M6IExpYW0gTWFyayA8bG1hcmtAY29kZWF1cm9yYS5vcmc+Cj4gQ2M6IFBy YXRpayBQYXRlbCA8cHJhdGlrcEBjb2RlYXVyb3JhLm9yZz4KPiBDYzogQnJpYW4gU3RhcmtleSA8 QnJpYW4uU3RhcmtleUBhcm0uY29tPgo+IENjOiBBbmRyZXcgRi4gRGF2aXMgPGFmZEB0aS5jb20+ Cj4gQ2M6IEFuZHJldyBNb3J0b24gPGFrcG1AbGludXgtZm91bmRhdGlvbi5vcmc+Cj4gQ2M6IFl1 ZSBIdSA8aHV5dWUyQHl1bG9uZy5jb20+Cj4gQ2M6IE1pa2UgUmFwb3BvcnQgPHJwcHRAbGludXgu aWJtLmNvbT4KPiBDYzogQ2hlbmJvIEZlbmcgPGZlbmdjQGdvb2dsZS5jb20+Cj4gQ2M6IEFsaXN0 YWlyIFN0cmFjaGFuIDxhc3RyYWNoYW5AZ29vZ2xlLmNvbT4KPiBDYzogU2FuZGVlcCBQYXRpbCA8 c3NwYXRpbEBnb29nbGUuY29tPgo+IENjOiBIcmlkeWEgVmFsc2FyYWp1IDxocmlkeWFAZ29vZ2xl LmNvbT4KPiBDYzogZHJpLWRldmVsQGxpc3RzLmZyZWVkZXNrdG9wLm9yZwo+IAo+IEpvaG4gU3R1 bHR6ICgxKToKPiAgIGRtYS1idWY6IGhlYXBzOiBBbGxvdyBzeXN0ZW0gJiBjbWEgaGVhcHMgdG8g YmUgY29uZmlndXJlZCBhcyBhIG1vZHVsZXMKPiAKPiBTYW5kZWVwIFBhdGlsICgxKToKPiAgIG1t OiBjbWE6IEV4cG9ydCBjbWEgc3ltYm9scyBmb3IgY21hIGhlYXAgYXMgYSBtb2R1bGUKPiAKPiAg ZHJpdmVycy9kbWEtYnVmL2RtYS1oZWFwLmMgICAgICAgICAgIHwgMiArKwo+ICBkcml2ZXJzL2Rt YS1idWYvaGVhcHMvS2NvbmZpZyAgICAgICAgfCA0ICsrLS0KPiAgZHJpdmVycy9kbWEtYnVmL2hl YXBzL2hlYXAtaGVscGVycy5jIHwgMiArKwo+ICBrZXJuZWwvZG1hL2NvbnRpZ3VvdXMuYyAgICAg ICAgICAgICAgfCAxICsKPiAgbW0vY21hLmMgICAgICAgICAgICAgICAgICAgICAgICAgICAgIHwg NSArKysrKwo+ICA1IGZpbGVzIGNoYW5nZWQsIDEyIGluc2VydGlvbnMoKyksIDIgZGVsZXRpb25z KC0pCj4gCj4gLS0gCj4gMi4xNy4xCj4gCj4gX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX18KPiBkcmktZGV2ZWwgbWFpbGluZyBsaXN0Cj4gZHJpLWRldmVsQGxp c3RzLmZyZWVkZXNrdG9wLm9yZwo+IGh0dHBzOi8vbGlzdHMuZnJlZWRlc2t0b3Aub3JnL21haWxt YW4vbGlzdGluZm8vZHJpLWRldmVsCgotLSAKRGFuaWVsIFZldHRlcgpTb2Z0d2FyZSBFbmdpbmVl ciwgSW50ZWwgQ29ycG9yYXRpb24KaHR0cDovL2Jsb2cuZmZ3bGwuY2gKX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KZHJpLWRldmVsIG1haWxpbmcgbGlzdApk cmktZGV2ZWxAbGlzdHMuZnJlZWRlc2t0b3Aub3JnCmh0dHBzOi8vbGlzdHMuZnJlZWRlc2t0b3Au b3JnL21haWxtYW4vbGlzdGluZm8vZHJpLWRldmVs