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=-12.8 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 3183DC4363D for ; Fri, 2 Oct 2020 21:25:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DEC98206C9 for ; Fri, 2 Oct 2020 21:25:10 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=broadcom.com header.i=@broadcom.com header.b="drpw6QHK" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725885AbgJBVZJ (ORCPT ); Fri, 2 Oct 2020 17:25:09 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34464 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725780AbgJBVZH (ORCPT ); Fri, 2 Oct 2020 17:25:07 -0400 Received: from mail-ua1-x964.google.com (mail-ua1-x964.google.com [IPv6:2607:f8b0:4864:20::964]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9BC52C0613D0 for ; Fri, 2 Oct 2020 14:25:07 -0700 (PDT) Received: by mail-ua1-x964.google.com with SMTP id z46so750005uac.13 for ; Fri, 02 Oct 2020 14:25:07 -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=7A/AobzH+FRJXYh7LD0AjUWQzN2kh06wV+p0DOwNKws=; b=drpw6QHKbky4UXyUEHvJglX3H0w8zfg3d1Hn0Vbt2I9CNQemUeKz/ZuiI0YT66valP dXD+Lbzw+7WD0W6xrqq9gq+Yrv1edn6BcDaQ8MJ/O2M7mXuZI1O0KiaH2vFnfnYP3Ul3 iKKd1DwCkyn7++GGEAkcDq4x0JkJISeA1Mq2M= 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=7A/AobzH+FRJXYh7LD0AjUWQzN2kh06wV+p0DOwNKws=; b=cxgJRY4U5KSfLLkA6dnSajxMZPrbdtZe4DHI59o1yBr2tBSK8Q3L1zuLgIjNg6bCS+ ZJyfhYzOedFXWV9hzTCaWVuympcKw9QpYqv70nQtTuFpPYm80jURWK+CN6zDrVVNjG++ IwEtXfs4eRayzVvN0see2EiEIHLiOWnK2F12Ep+JdmDZNtQcUKHTLyuVsTzFjmfOvGJZ DmqiPjCZusXgxOqCibqhAZkhnpVhF6ct1DOMGZD0Fb5oIM8t6TGWOzaPyZomtJhQgKIR a4ZlbIJtG3Bf98GpaDdY0t+L2xJ+S/vEA0xN0/+C9C3KIKdRqYJtUS+d4/ZUbkqOI6Wc axzQ== X-Gm-Message-State: AOAM532MqVfmH8ICYefhsTuGh3FU7ukLLnQl4/Dm3+9PSIRWciZ5hSOx seQ0HPojqsp0xj3QUPYqZ8YeQuEb7hqsnEuXxIxhyfd3p2PK X-Google-Smtp-Source: ABdhPJwqn27ChvTf7JYVf6NDoVVKxcvO/QUWhPTEyzOzzTRUZcAD0YV/wKF7GzvR7obYOkGdibPHFhb5LV/g X-Received: by 2002:ab0:702a:: with SMTP id u10mr2451089ual.59.1601673906816; Fri, 02 Oct 2020 14:25:06 -0700 (PDT) Received: from lbrmn-lnxub113.broadcom.net ([192.19.228.250]) by smtp-relay.gmail.com with ESMTPS id x2sm327292vsn.4.2020.10.02.14.25.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 02 Oct 2020 14:25:06 -0700 (PDT) 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 v6 12/14] misc: bcm-vk: add mmap function for exposing BAR2 Date: Fri, 2 Oct 2020 14:23:25 -0700 Message-Id: <20201002212327.18393-13-scott.branden@broadcom.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20201002212327.18393-1-scott.branden@broadcom.com> References: <20201002212327.18393-1-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 6c2370723e0a..8b869d7f7b93 100644 --- a/drivers/misc/bcm-vk/bcm_vk_dev.c +++ b/drivers/misc/bcm-vk/bcm_vk_dev.c @@ -1177,6 +1177,29 @@ 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; @@ -1215,6 +1238,7 @@ 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