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=-18.9 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 0939DC433DB for ; Wed, 20 Jan 2021 18:18:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B05EF233FE for ; Wed, 20 Jan 2021 18:18:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2391966AbhATSSs (ORCPT ); Wed, 20 Jan 2021 13:18:48 -0500 Received: from lpdvacalvio01.broadcom.com ([192.19.229.182]:41050 "EHLO relay.smtp-ext.broadcom.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2391910AbhATSKA (ORCPT ); Wed, 20 Jan 2021 13:10:00 -0500 Received: from lbrmn-lnxub113.broadcom.net (lbrmn-lnxub113.ric.broadcom.net [10.136.13.65]) by relay.smtp-ext.broadcom.com (Postfix) with ESMTP id 0255C30E78; Wed, 20 Jan 2021 09:58:38 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.11.0 relay.smtp-ext.broadcom.com 0255C30E78 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=broadcom.com; s=dkimrelay; t=1611165519; bh=UkZ51eWbBlBwEelRgR8az5cA0SzKlZ28xof6U1GGybM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Srt0UL9JP8NZmz8sljyma6q4K/HHED920+yF/XifOADHqMEb7QqQGo5EtgLywPQOf 3wDjL9Q7pDvtAnoSF7849gab6bFLnAdwptgNEgg+YO2NtmHaI+31Sjl341P3NZ+S5q rQ2iZvJq/jwmSYduK8mm9p2+TGDHAMYF3liQShGI= 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 , Olof Johansson Subject: [PATCH v9 11/13] misc: bcm-vk: add mmap function for exposing BAR2 Date: Wed, 20 Jan 2021 09:58:25 -0800 Message-Id: <20210120175827.14820-12-scott.branden@broadcom.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210120175827.14820-1-scott.branden@broadcom.com> References: <20210120175827.14820-1-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 Acked-by: Olof Johansson --- 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