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=-20.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, 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 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 86F74C71156 for ; Mon, 30 Nov 2020 18:44:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 49D9620705 for ; Mon, 30 Nov 2020 18:44:20 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=broadcom.com header.i=@broadcom.com header.b="YiTfEUaK" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388241AbgK3SoD (ORCPT ); Mon, 30 Nov 2020 13:44:03 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59228 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388215AbgK3SoC (ORCPT ); Mon, 30 Nov 2020 13:44:02 -0500 Received: from mail-oi1-x263.google.com (mail-oi1-x263.google.com [IPv6:2607:f8b0:4864:20::263]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AAAC5C0613D4 for ; Mon, 30 Nov 2020 10:43:22 -0800 (PST) Received: by mail-oi1-x263.google.com with SMTP id y74so15248397oia.11 for ; Mon, 30 Nov 2020 10:43:22 -0800 (PST) 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=qdDrJWDoHM5C1t4XqMRoNQ2neP9NmJwItgmGwxLWbMo=; b=YiTfEUaKErt9RIeyxKquUrEiqL1WnuecQ4lM+HQ/U8tBQRWOZ/ZV+XzD12BzO01ysM zClR52d81yOy9QpozQK7LnEA7h9Jrd8ZXzwnLVDxiuc2hBNnf3yyGY/+qHd05pDcsKv4 Vj0eXf/wOGOFtcnchNvcBG6j18nY3mp7/k20U= 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=qdDrJWDoHM5C1t4XqMRoNQ2neP9NmJwItgmGwxLWbMo=; b=W0xk31HbbnHflzk3bQBG6SEQTZeZ48UelQXn7VB0jaNqM3FfoipWiYnss5A0P78284 Xwea9xgZ+qNfji9Q+Hg+jHZbpjg3va7MxhspL4S9YwBSmnGoXAC0hL5Ly1Itj8AlDpZX aNzfIQ+aq3fYhMb8IXWTl76ZnIZ3wD4podN9s05aOkmredz6jRUy5PCnwGfZLYDYgzf+ qTrX3EXCHqZlYEzsBCAkkXC6w26Ud0SwVCxZ9f49r/8EaMG637vNBMMlRG8wK6fhs2sx eo5a103yHZXPxLygmiJJr6IeUEyiAG/faEVzGNTCeFXInlFI7yrcMrKsKW75f+GLuQOv /PSw== X-Gm-Message-State: AOAM533rEyp9uZdpR6d0NaKda03Eep6Q/FybG0DnlGTShpa98zKk/bsI PeQIjUNvN2pakxvSQYowivVTfEq/XQ7lTsk8G3/5ZgYeQoMj X-Google-Smtp-Source: ABdhPJw8AoqDMEH5vG4S+BxaXzsM563tQFKwnsg2NzsTcJDm4e6iY40Bk56OXlriJbgt4qEpS/QJJRlJ6q/x X-Received: by 2002:aca:df83:: with SMTP id w125mr125766oig.165.1606761802001; Mon, 30 Nov 2020 10:43:22 -0800 (PST) Received: from lbrmn-lnxub113.broadcom.net ([192.19.228.250]) by smtp-relay.gmail.com with ESMTPS id z21sm1909069ooe.19.2020.11.30.10.43.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 30 Nov 2020 10:43:21 -0800 (PST) X-Relaying-Domain: broadcom.com From: Scott Branden To: Arnd Bergmann , Greg Kroah-Hartman , Scott Branden , Desmond Yan Cc: Kees Cook , linux-kernel@vger.kernel.org, bcm-kernel-feedback-list@broadcom.com, Olof Johansson Subject: [PATCH v8 11/13] misc: bcm-vk: add mmap function for exposing BAR2 Date: Mon, 30 Nov 2020 10:41:58 -0800 Message-Id: <20201130184200.5095-12-scott.branden@broadcom.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20201130184200.5095-1-scott.branden@broadcom.com> References: <20201130184200.5095-1-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 e572a7b18fab..cac07419f041 100644 --- a/drivers/misc/bcm-vk/bcm_vk_dev.c +++ b/drivers/misc/bcm-vk/bcm_vk_dev.c @@ -1199,6 +1199,29 @@ 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; @@ -1237,6 +1260,7 @@ 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