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: 12063677 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=-16.5 required=3.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED,DKIM_INVALID,DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT 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 6AA6DC433E0 for ; Wed, 3 Feb 2021 08:13:43 +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 153E164F7C for ; Wed, 3 Feb 2021 08:13:43 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 153E164F7C Authentication-Results: mail.kernel.org; dmarc=fail (p=reject dis=none) header.from=google.com 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 354B26E9E8; Wed, 3 Feb 2021 08:13:10 +0000 (UTC) Received: from mail-qt1-x84a.google.com (mail-qt1-x84a.google.com [IPv6:2607:f8b0:4864:20::84a]) by gabe.freedesktop.org (Postfix) with ESMTPS id 2D7166E9C1 for ; Wed, 3 Feb 2021 00:31:39 +0000 (UTC) Received: by mail-qt1-x84a.google.com with SMTP id v13so5753560qtq.18 for ; Tue, 02 Feb 2021 16:31:39 -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=aiMKcfiMa7Qzv34kr/ER18m9BJttckzGKJvRRMQZTlRLAcISAaS0aXTKBCyG1zyeV0 J5tBFQBaPhojLjw9yjsncvdQQ8/Z75C4mkxTXKnAhs8x8o6OWbbXv8+CccKv67QfMlb2 gyouXkrhC8cIanoM9T5eTw7O9cyfPyqYBhqeS8oQv//hrUG69k7zZY7htzkmyQZALBk5 8AnzK52WRinNEaKBq8sqBbJvRlbBdpVOnRM2RAsqsooTWqQPPUiXE+0TeCUtx0YfLKo+ /RbpQTXL7qs7JV15KG0Cx2t+/XTPhFvYQCbA6Io+mxrqcP1kEU3z/o7Zxt4pUO9RjN+p azIw== X-Gm-Message-State: AOAM531ttCl8dQgnoaK/xXs+MBy9pOme2NFE4+QeUmFkQo2iT9blKgD9 7sfBwOsvZCr8rrH0fYvX3kPL+MxTluI= X-Google-Smtp-Source: ABdhPJwlIrpFiCM10hcfIL1xRHkC2ka4Rp5OqMsb623obcfa1dzEsxG62HhtetSAvxKOVvEOcxKdtwB6Ytc= 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 X-Mailman-Approved-At: Wed, 03 Feb 2021 08:13:07 +0000 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linaro-mm-sig@lists.linaro.org, orjan.eide@arm.com, sspatil@google.com, linux-mm@kvack.org, kernel-team@android.com, jajones@nvidia.com, surenb@google.com, linux-kernel@vger.kernel.org, lmark@codeaurora.org, christian.koenig@amd.com, hch@infradead.org, minchan@kernel.org, dri-devel@lists.freedesktop.org, cgoldswo@codeaurora.org, hridya@google.com, akpm@linux-foundation.org, labbott@redhat.com, robin.murphy@arm.com, linux-media@vger.kernel.org Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" 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;