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=-13.6 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 60BC0C2D0A8 for ; Tue, 29 Sep 2020 00:13:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 004922080A for ; Tue, 29 Sep 2020 00:13:37 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=broadcom.com header.i=@broadcom.com header.b="D08w7hiQ" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727321AbgI2ANh (ORCPT ); Mon, 28 Sep 2020 20:13:37 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45824 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727310AbgI2ANd (ORCPT ); Mon, 28 Sep 2020 20:13:33 -0400 Received: from mail-pl1-x662.google.com (mail-pl1-x662.google.com [IPv6:2607:f8b0:4864:20::662]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D1E94C0613D4 for ; Mon, 28 Sep 2020 17:13:32 -0700 (PDT) Received: by mail-pl1-x662.google.com with SMTP id y20so16418pll.12 for ; Mon, 28 Sep 2020 17:13:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=ToaTiIP8yzRijutkkGKj+sxGdqOvq2bVY0YY58L/rGY=; b=D08w7hiQbyPbiSLGFnarzJ1Dbh4uRyRpDDmErG8JvrFjZ6GrgvdANCUOd3s/ZBHJt0 DCcoVk4gfdFSq8aWmoGmfzQmXU4d6vl2wvULxCKW4Dq3seznMHQo0hlDuMKyduB5BsLO QkPQH18nbqbYYK7ttphxJQM2XV2a291/fxeF4= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=ToaTiIP8yzRijutkkGKj+sxGdqOvq2bVY0YY58L/rGY=; b=sDXBXl1Z5vAI2bnzdujX+9NVLQcDESmQ9cc7g5kW4dG30jEzvtoYvzAyA/VKS7z9e8 bSM48JEQRGhEsTs6tCdeDEVJtEMyt3GcsxHR8s8N1gfADKu1eUfqlqF0P6QURN9Rmuae HLP5Ime3fR4A3xdsNAD3mZRK3f0CxRSLXMMfGRNmG9I3T0fvzaVynV8PBcBcRtnlk9wo FKMXZDjR3MpkKuTQCJ5wevGjNYgBELiJt9if/xyE2SN3bEV5Xgrw98tjTqubNpptymkr eVq/QKyLxKGLOS7zuF8fSf+JyEm7oGHhzu1wArY7G6Qxa+3XDcuQUEjstClw07wLsLSW 6B5Q== X-Gm-Message-State: AOAM531X3IgyUr0qfwr/ZzNlJtyc6FpEwT3lkG0zWbz2HTvTX22qyhar qazhPJytxL9xVZS+tZk8ropRS0UnVCIY0wmUK3Gnc0MgHrOQ X-Google-Smtp-Source: ABdhPJyThI1Ew5nvZB9bjubLINT5DQW00sNBH43CkJ/4Ps1J7bovA96UQdDQ0yDzXo1TtsqjZFWOOZaBg4Q4 X-Received: by 2002:a17:902:b186:b029:d1:cc21:9a7d with SMTP id s6-20020a170902b186b02900d1cc219a7dmr1831921plr.8.1601338412313; Mon, 28 Sep 2020 17:13:32 -0700 (PDT) Received: from lbrmn-lnxub113.broadcom.net ([192.19.228.250]) by smtp-relay.gmail.com with ESMTPS id t1sm1047973pjr.8.2020.09.28.17.13.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 28 Sep 2020 17:13:32 -0700 (PDT) X-Relaying-Domain: broadcom.com From: Scott Branden To: Arnd Bergmann , Greg Kroah-Hartman , Scott Branden Cc: Kees Cook , linux-kernel@vger.kernel.org, bcm-kernel-feedback-list@broadcom.com, Desmond Yan Subject: [PATCH v4 15/16] misc: bcm-vk: add mmap function for exposing BAR2 Date: Mon, 28 Sep 2020 17:12:08 -0700 Message-Id: <20200929001209.16393-16-scott.branden@broadcom.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200929001209.16393-1-scott.branden@broadcom.com> References: <20200929001209.16393-1-scott.branden@broadcom.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add mmap function that allows host application to open up BAR2 memory for remote spooling out messages from the VK logger. Co-developed-by: Desmond Yan Signed-off-by: Desmond Yan Signed-off-by: Scott Branden --- drivers/misc/bcm-vk/bcm_vk_dev.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/drivers/misc/bcm-vk/bcm_vk_dev.c b/drivers/misc/bcm-vk/bcm_vk_dev.c index 000febe967c1..e83c0e48fdeb 100644 --- a/drivers/misc/bcm-vk/bcm_vk_dev.c +++ b/drivers/misc/bcm-vk/bcm_vk_dev.c @@ -1178,6 +1178,29 @@ static long bcm_vk_reset(struct bcm_vk *vk, struct vk_reset __user *arg) return ret; } +static int bcm_vk_mmap(struct file *file, struct vm_area_struct *vma) +{ + struct bcm_vk_ctx *ctx = file->private_data; + struct bcm_vk *vk = container_of(ctx->miscdev, struct bcm_vk, miscdev); + unsigned long pg_size; + + /* only BAR2 is mmap possible, which is bar num 4 due to 64bit */ +#define VK_MMAPABLE_BAR 4 + + pg_size = ((pci_resource_len(vk->pdev, VK_MMAPABLE_BAR) - 1) + >> PAGE_SHIFT) + 1; + if (vma->vm_pgoff + vma_pages(vma) > pg_size) + return -EINVAL; + + vma->vm_pgoff += (pci_resource_start(vk->pdev, VK_MMAPABLE_BAR) + >> PAGE_SHIFT); + vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); + + return io_remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff, + vma->vm_end - vma->vm_start, + vma->vm_page_prot); +} + static long bcm_vk_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { long ret = -EINVAL; @@ -1216,6 +1239,7 @@ static const struct file_operations bcm_vk_fops = { .write = bcm_vk_write, .poll = bcm_vk_poll, .release = bcm_vk_release, + .mmap = bcm_vk_mmap, .unlocked_ioctl = bcm_vk_ioctl, }; -- 2.17.1