From patchwork Mon Mar 23 17:19:07 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Diana Madalina Craciun X-Patchwork-Id: 11453579 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id D0118139A for ; Mon, 23 Mar 2020 17:19:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BA63220774 for ; Mon, 23 Mar 2020 17:19:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727976AbgCWRTs (ORCPT ); Mon, 23 Mar 2020 13:19:48 -0400 Received: from inva021.nxp.com ([92.121.34.21]:57126 "EHLO inva021.nxp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727811AbgCWRTc (ORCPT ); Mon, 23 Mar 2020 13:19:32 -0400 Received: from inva021.nxp.com (localhost [127.0.0.1]) by inva021.eu-rdc02.nxp.com (Postfix) with ESMTP id DB1F220184A; Mon, 23 Mar 2020 18:19:29 +0100 (CET) Received: from inva024.eu-rdc02.nxp.com (inva024.eu-rdc02.nxp.com [134.27.226.22]) by inva021.eu-rdc02.nxp.com (Postfix) with ESMTP id CE7292012E7; Mon, 23 Mar 2020 18:19:29 +0100 (CET) Received: from fsr-ub1864-111.ea.freescale.net (fsr-ub1864-111.ea.freescale.net [10.171.82.141]) by inva024.eu-rdc02.nxp.com (Postfix) with ESMTP id 528452035C; Mon, 23 Mar 2020 18:19:29 +0100 (CET) From: Diana Craciun To: kvm@vger.kernel.org, alex.williamson@redhat.com, laurentiu.tudor@nxp.com, linux-arm-kernel@lists.infradead.org, bharatb.yadav@gmail.com Cc: linux-kernel@vger.kernel.org, Diana Craciun , Bharat Bhushan Subject: [PATCH 5/9] vfio/fsl-mc: Allow userspace to MMAP fsl-mc device MMIO regions Date: Mon, 23 Mar 2020 19:19:07 +0200 Message-Id: <20200323171911.27178-6-diana.craciun@oss.nxp.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200323171911.27178-1-diana.craciun@oss.nxp.com> References: <20200323171911.27178-1-diana.craciun@oss.nxp.com> X-Virus-Scanned: ClamAV using ClamSMTP Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Allow userspace to mmap device regions for direct access of fsl-mc devices. Signed-off-by: Bharat Bhushan Signed-off-by: Diana Craciun --- drivers/vfio/fsl-mc/vfio_fsl_mc.c | 64 ++++++++++++++++++++++- drivers/vfio/fsl-mc/vfio_fsl_mc_private.h | 2 + 2 files changed, 64 insertions(+), 2 deletions(-) diff --git a/drivers/vfio/fsl-mc/vfio_fsl_mc.c b/drivers/vfio/fsl-mc/vfio_fsl_mc.c index 094df3aa3710..6625b7cb0a3e 100644 --- a/drivers/vfio/fsl-mc/vfio_fsl_mc.c +++ b/drivers/vfio/fsl-mc/vfio_fsl_mc.c @@ -31,7 +31,11 @@ static int vfio_fsl_mc_regions_init(struct vfio_fsl_mc_device *vdev) vdev->regions[i].addr = res->start; vdev->regions[i].size = PAGE_ALIGN((resource_size(res))); - vdev->regions[i].flags = 0; + vdev->regions[i].flags = VFIO_REGION_INFO_FLAG_MMAP; + vdev->regions[i].flags |= VFIO_REGION_INFO_FLAG_READ; + if (!(mc_dev->regions[i].flags & IORESOURCE_READONLY)) + vdev->regions[i].flags |= VFIO_REGION_INFO_FLAG_WRITE; + vdev->regions[i].type = mc_dev->regions[i].flags & IORESOURCE_BITS; } vdev->num_regions = mc_dev->obj_desc.region_count; @@ -163,9 +167,65 @@ static ssize_t vfio_fsl_mc_write(void *device_data, const char __user *buf, return -EINVAL; } +static int vfio_fsl_mc_mmap_mmio(struct vfio_fsl_mc_region region, + struct vm_area_struct *vma) +{ + u64 size = vma->vm_end - vma->vm_start; + u64 pgoff, base; + + pgoff = vma->vm_pgoff & + ((1U << (VFIO_FSL_MC_OFFSET_SHIFT - PAGE_SHIFT)) - 1); + base = pgoff << PAGE_SHIFT; + + if (region.size < PAGE_SIZE || base + size > region.size) + return -EINVAL; + + if (!(region.type & VFIO_DPRC_REGION_CACHEABLE)) + vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); + + vma->vm_pgoff = (region.addr >> PAGE_SHIFT) + pgoff; + + return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff, + size, vma->vm_page_prot); +} + static int vfio_fsl_mc_mmap(void *device_data, struct vm_area_struct *vma) { - return -EINVAL; + struct vfio_fsl_mc_device *vdev = device_data; + struct fsl_mc_device *mc_dev = vdev->mc_dev; + unsigned long size, addr; + int index; + + index = vma->vm_pgoff >> (VFIO_FSL_MC_OFFSET_SHIFT - PAGE_SHIFT); + + if (vma->vm_end < vma->vm_start) + return -EINVAL; + if (vma->vm_start & ~PAGE_MASK) + return -EINVAL; + if (vma->vm_end & ~PAGE_MASK) + return -EINVAL; + if (!(vma->vm_flags & VM_SHARED)) + return -EINVAL; + if (index >= vdev->num_regions) + return -EINVAL; + + if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_MMAP)) + return -EINVAL; + + if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_READ) + && (vma->vm_flags & VM_READ)) + return -EINVAL; + + if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_WRITE) + && (vma->vm_flags & VM_WRITE)) + return -EINVAL; + + addr = vdev->regions[index].addr; + size = vdev->regions[index].size; + + vma->vm_private_data = mc_dev; + + return vfio_fsl_mc_mmap_mmio(vdev->regions[index], vma); } static int vfio_fsl_mc_init_device(struct vfio_fsl_mc_device *vdev) diff --git a/drivers/vfio/fsl-mc/vfio_fsl_mc_private.h b/drivers/vfio/fsl-mc/vfio_fsl_mc_private.h index 764e2cf2c70d..e2a0ccdd8242 100644 --- a/drivers/vfio/fsl-mc/vfio_fsl_mc_private.h +++ b/drivers/vfio/fsl-mc/vfio_fsl_mc_private.h @@ -15,6 +15,8 @@ #define VFIO_FSL_MC_INDEX_TO_OFFSET(index) \ ((u64)(index) << VFIO_FSL_MC_OFFSET_SHIFT) +#define VFIO_DPRC_REGION_CACHEABLE 0x00000001 + struct vfio_fsl_mc_region { u32 flags; u32 type;