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=-6.7 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=unavailable 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 C7A4CC3A5A6 for ; Tue, 27 Aug 2019 08:39:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A60C9206BA for ; Tue, 27 Aug 2019 08:39:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729469AbfH0Ijy (ORCPT ); Tue, 27 Aug 2019 04:39:54 -0400 Received: from mx1.redhat.com ([209.132.183.28]:46644 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726735AbfH0Ijy (ORCPT ); Tue, 27 Aug 2019 04:39:54 -0400 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 5160F18C4272; Tue, 27 Aug 2019 08:39:54 +0000 (UTC) Received: from gondolin (dhcp-192-222.str.redhat.com [10.33.192.222]) by smtp.corp.redhat.com (Postfix) with ESMTP id EED1E60923; Tue, 27 Aug 2019 08:39:45 +0000 (UTC) Date: Tue, 27 Aug 2019 10:39:43 +0200 From: Cornelia Huck To: Vivek Goyal Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-nvdimm@lists.01.org, virtio-fs@redhat.com, miklos@szeredi.hu, stefanha@redhat.com, dgilbert@redhat.com, Sebastien Boeuf , kvm@vger.kernel.org Subject: Re: [PATCH 05/19] virtio: Implement get_shm_region for MMIO transport Message-ID: <20190827103943.4c6c9342.cohuck@redhat.com> In-Reply-To: <20190821175720.25901-6-vgoyal@redhat.com> References: <20190821175720.25901-1-vgoyal@redhat.com> <20190821175720.25901-6-vgoyal@redhat.com> Organization: Red Hat GmbH MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.6.2 (mx1.redhat.com [10.5.110.62]); Tue, 27 Aug 2019 08:39:54 +0000 (UTC) Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org On Wed, 21 Aug 2019 13:57:06 -0400 Vivek Goyal wrote: > From: Sebastien Boeuf > > On MMIO a new set of registers is defined for finding SHM > regions. Add their definitions and use them to find the region. > > Cc: kvm@vger.kernel.org > Signed-off-by: Sebastien Boeuf > --- > drivers/virtio/virtio_mmio.c | 32 ++++++++++++++++++++++++++++++++ > include/uapi/linux/virtio_mmio.h | 11 +++++++++++ > 2 files changed, 43 insertions(+) > > diff --git a/drivers/virtio/virtio_mmio.c b/drivers/virtio/virtio_mmio.c > index e09edb5c5e06..5c07985c8cb8 100644 > --- a/drivers/virtio/virtio_mmio.c > +++ b/drivers/virtio/virtio_mmio.c > @@ -500,6 +500,37 @@ static const char *vm_bus_name(struct virtio_device *vdev) > return vm_dev->pdev->name; > } > > +static bool vm_get_shm_region(struct virtio_device *vdev, > + struct virtio_shm_region *region, u8 id) > +{ > + struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); > + u64 len, addr; > + > + /* Select the region we're interested in */ > + writel(id, vm_dev->base + VIRTIO_MMIO_SHM_SEL); > + > + /* Read the region size */ > + len = (u64) readl(vm_dev->base + VIRTIO_MMIO_SHM_LEN_LOW); > + len |= (u64) readl(vm_dev->base + VIRTIO_MMIO_SHM_LEN_HIGH) << 32; > + > + region->len = len; > + > + /* Check if region length is -1. If that's the case, the shared memory > + * region does not exist and there is no need to proceed further. > + */ > + if (len == ~(u64)0) { > + return false; > + } I think the curly braces should be dropped here. > + > + /* Read the region base address */ > + addr = (u64) readl(vm_dev->base + VIRTIO_MMIO_SHM_BASE_LOW); > + addr |= (u64) readl(vm_dev->base + VIRTIO_MMIO_SHM_BASE_HIGH) << 32; > + > + region->addr = addr; > + > + return true; > +} > + > static const struct virtio_config_ops virtio_mmio_config_ops = { > .get = vm_get, > .set = vm_set, Reviewed-by: Cornelia Huck