From patchwork Wed Feb 3 00:31:34 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Suren Baghdasaryan X-Patchwork-Id: 375674 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=-26.2 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT, USER_IN_DEF_DKIM_WL autolearn=unavailable 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 C49EEC433DB for ; Wed, 3 Feb 2021 00:33:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7C98B64F6A for ; Wed, 3 Feb 2021 00:33:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232457AbhBCAcV (ORCPT ); Tue, 2 Feb 2021 19:32:21 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44756 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232329AbhBCAcT (ORCPT ); Tue, 2 Feb 2021 19:32:19 -0500 Received: from mail-qt1-x849.google.com (mail-qt1-x849.google.com [IPv6:2607:f8b0:4864:20::849]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DE00EC0613ED for ; Tue, 2 Feb 2021 16:31:38 -0800 (PST) Received: by mail-qt1-x849.google.com with SMTP id v65so13332004qtd.0 for ; Tue, 02 Feb 2021 16:31:38 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=sender:date:in-reply-to:message-id:mime-version:references:subject :from:to:cc; bh=5KtTzd9k+c9bS2Y/wk34+i/vvyNbysJG7UZJv8N2Wp4=; b=oNXRZrunpy+nJxCNVG2DVespyvOU6v+/PBcSm/lmaxwIlZyPY+Y+aGI83iN/QE12TQ /9B5j+GzglaY+R0ZfttfhxpqWqSdb8Mhk5fb+2BB6mUU3pAKYZ4YkOotTy5PPFko52Yw DjiUxnZm5/e875fNSMeJZUpfPmcgyFUAHmh7OGgzKQMnmFkSDTyR+23aDUO7XbQpLyJ/ ODLwOmX6057PVKLp4hTX/hoK0O+U8lfiVVL2hxkockdBfgWJvRtI34i+fdKn9nJsjv6I DrqX9S8rzdrQ6xlTKqKv6sGUpn32curAQw3IMOe9YcnA/sGJg2xlAFdtgblXQs264SLf TFKQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=5KtTzd9k+c9bS2Y/wk34+i/vvyNbysJG7UZJv8N2Wp4=; b=toea45MkEbnnAGNeAY0zbLpy9oZ8rTcs6e+SbczCiBPmznwkiv0ix8oTqPAES/ggRC wR63Z8CF8Kt17eWMEe9dVate+C98ANljdE0em2E2/pc3TUzB/T8F0vOJBSDn31TAHrtK 56nS9hdfyrmwPxYL+p0xr60e9uUhl4gZXP/Db+7zLBRIiMstcwvJhxBBs4sxVP/yWaZY a6F8mha6OwhWABlQbRtWIFIuSexdh5dIJxJMKMMpBc6M/FRSY4txLgjJtgW5ckJcB/ti QVNxjnAATN/DfiMrJwZ/N3mnlONhjO94wxPkyf/JlxyI0WBndA/pk6eAYKSKCtnYO5j6 E0SA== X-Gm-Message-State: AOAM532ZUW41CKlettel8DQgd2jM9hqdsa2rpFyshHkffSYQIt1UShMM 2qutlANTwXITaHF9JlRaplYfBQekmG8= X-Google-Smtp-Source: ABdhPJwlIrpFiCM10hcfIL1xRHkC2ka4Rp5OqMsb623obcfa1dzEsxG62HhtetSAvxKOVvEOcxKdtwB6Ytc= Sender: "surenb via sendgmr" X-Received: from surenb1.mtv.corp.google.com ([2620:15c:211:200:9194:cd6:1ec:3e2d]) (user=surenb job=sendgmr) by 2002:a0c:8365:: with SMTP id j92mr418503qva.19.1612312297983; Tue, 02 Feb 2021 16:31:37 -0800 (PST) Date: Tue, 2 Feb 2021 16:31:34 -0800 In-Reply-To: <20210203003134.2422308-1-surenb@google.com> Message-Id: <20210203003134.2422308-2-surenb@google.com> Mime-Version: 1.0 References: <20210203003134.2422308-1-surenb@google.com> X-Mailer: git-send-email 2.30.0.365.g02bc693789-goog Subject: [PATCH v2 2/2] dma-buf: heaps: Map system heap pages as managed by linux vm From: Suren Baghdasaryan To: sumit.semwal@linaro.org Cc: akpm@linux-foundation.org, hch@infradead.org, lmark@codeaurora.org, labbott@redhat.com, Brian.Starkey@arm.com, john.stultz@linaro.org, christian.koenig@amd.com, cgoldswo@codeaurora.org, orjan.eide@arm.com, robin.murphy@arm.com, jajones@nvidia.com, minchan@kernel.org, hridya@google.com, sspatil@google.com, linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, kernel-team@android.com, surenb@google.com Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Currently system heap maps its buffers with VM_PFNMAP flag using remap_pfn_range. This results in such buffers not being accounted for in PSS calculations because vm treats this memory as having no page structs. Without page structs there are no counters representing how many processes are mapping a page and therefore PSS calculation is impossible. Historically, ION driver used to map its buffers as VM_PFNMAP areas due to memory carveouts that did not have page structs [1]. That is not the case anymore and it seems there was desire to move away from remap_pfn_range [2]. Dmabuf system heap design inherits this ION behavior and maps its pages using remap_pfn_range even though allocated pages are backed by page structs. Replace remap_pfn_range with vm_insert_page, following Laura's suggestion in [1]. This would allow correct PSS calculation for dmabufs. [1] https://driverdev-devel.linuxdriverproject.narkive.com/v0fJGpaD/using-ion-memory-for-direct-io [2] http://driverdev.linuxdriverproject.org/pipermail/driverdev-devel/2018-October/127519.html (sorry, could not find lore links for these discussions) Suggested-by: Laura Abbott Signed-off-by: Suren Baghdasaryan --- v1 posted at: https://lore.kernel.org/patchwork/patch/1372409/ changes in v2: - removed VM_PFNMAP clearing part of the patch, per Minchan and Christoph - created prerequisite patch to replace BUG_ON with WARN_ON_ONCE, per Christoph drivers/dma-buf/heaps/system_heap.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/dma-buf/heaps/system_heap.c b/drivers/dma-buf/heaps/system_heap.c index 17e0e9a68baf..4983f18cc2ce 100644 --- a/drivers/dma-buf/heaps/system_heap.c +++ b/drivers/dma-buf/heaps/system_heap.c @@ -203,8 +203,7 @@ static int system_heap_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma) for_each_sgtable_page(table, &piter, vma->vm_pgoff) { struct page *page = sg_page_iter_page(&piter); - ret = remap_pfn_range(vma, addr, page_to_pfn(page), PAGE_SIZE, - vma->vm_page_prot); + ret = vm_insert_page(vma, addr, page); if (ret) return ret; addr += PAGE_SIZE;