From patchwork Mon Oct 9 09:09:12 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Auger X-Patchwork-Id: 13413169 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id DF3BEE95A91 for ; Mon, 9 Oct 2023 09:13:31 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qpmIe-0003IT-Nu; Mon, 09 Oct 2023 05:11:40 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qpmIO-0002hN-3A for qemu-devel@nongnu.org; Mon, 09 Oct 2023 05:11:27 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qpmIK-0007jJ-HU for qemu-devel@nongnu.org; Mon, 09 Oct 2023 05:11:23 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1696842678; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=rEHvbrLn4PE1hoM6muCdh+nbBl9WpvNclOmMZAIykp8=; b=iaW6XDOdDU6B5CboBjfwaksyqbb21c5izlVSUeZQhgqYoA7DbsmI753kJr9GsEVdv9JueL qaN/0x0vBhI1z0i+G2iHuAH+8nHVTj3VAX2GpZgb6JJz3J3ir2a7ZfFCq+4w4FJaH+z6Ce ojVIrin1EVcnkCmvyrUY18cAZpw4yAg= Received: from mimecast-mx02.redhat.com (mx-ext.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-387-kMmZJBHPOiSIO7hZcyQXeg-1; Mon, 09 Oct 2023 05:11:12 -0400 X-MC-Unique: kMmZJBHPOiSIO7hZcyQXeg-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.rdu2.redhat.com [10.11.54.5]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 2CFEA3C0DF7F; Mon, 9 Oct 2023 09:11:12 +0000 (UTC) Received: from laptop.redhat.com (unknown [10.39.192.172]) by smtp.corp.redhat.com (Postfix) with ESMTP id 10513167F8; Mon, 9 Oct 2023 09:11:08 +0000 (UTC) From: Eric Auger To: eric.auger.pro@gmail.com, eric.auger@redhat.com, qemu-devel@nongnu.org, zhenzhong.duan@intel.com, alex.williamson@redhat.com, clg@redhat.com, jgg@nvidia.com, nicolinc@nvidia.com, joao.m.martins@oracle.com, peterx@redhat.com, kevin.tian@intel.com, yi.l.liu@intel.com, yi.y.sun@intel.com, chao.p.peng@intel.com, mjrosato@linux.ibm.com, aik@ozlabs.ru Subject: [PATCH v5 10/15] vfio/ccw: Use vfio_[attach/detach]_device Date: Mon, 9 Oct 2023 11:09:12 +0200 Message-ID: <20231009091035.433329-11-eric.auger@redhat.com> In-Reply-To: <20231009091035.433329-1-eric.auger@redhat.com> References: <20231009091035.433329-1-eric.auger@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.5 Received-SPF: pass client-ip=170.10.129.124; envelope-from=eric.auger@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Let the vfio-ccw device use vfio_attach_device() and vfio_detach_device(), hence hiding the details of the used IOMMU backend. Note that the migration reduces the following trace "vfio: subchannel %s has already been attached" (featuring cssid.ssid.devid) into "device is already attached" Also now all the devices have been migrated to use the new vfio_attach_device/vfio_detach_device API, let's turn the legacy functions into static functions, local to container.c. Signed-off-by: Eric Auger Signed-off-by: Yi Liu Signed-off-by: Zhenzhong Duan --- v4 -> v5: - do not overwrite sysfsdev [Zhenzhong] - remove name local variable v3: - simplified vbasedev->dev setting v2 -> v3: - Hopefully fix confusion beteen vbasedev->name, mdevid and sysfsdev while keeping into account Matthew's comment https://lore.kernel.org/qemu-devel/6e04ab8f-dc84-e9c2-deea-2b6b31678b53@linux.ibm.com/ --- include/hw/vfio/vfio-common.h | 5 -- hw/vfio/ccw.c | 117 ++++++++-------------------------- hw/vfio/common.c | 10 +-- 3 files changed, 32 insertions(+), 100 deletions(-) diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h index 12fbfbc37d..c486bdef2a 100644 --- a/include/hw/vfio/vfio-common.h +++ b/include/hw/vfio/vfio-common.h @@ -202,7 +202,6 @@ typedef struct { hwaddr pages; } VFIOBitmap; -void vfio_put_base_device(VFIODevice *vbasedev); void vfio_disable_irqindex(VFIODevice *vbasedev, int index); void vfio_unmask_single_irqindex(VFIODevice *vbasedev, int index); void vfio_mask_single_irqindex(VFIODevice *vbasedev, int index); @@ -220,11 +219,7 @@ void vfio_region_unmap(VFIORegion *region); void vfio_region_exit(VFIORegion *region); void vfio_region_finalize(VFIORegion *region); void vfio_reset_handler(void *opaque); -VFIOGroup *vfio_get_group(int groupid, AddressSpace *as, Error **errp); -void vfio_put_group(VFIOGroup *group); struct vfio_device_info *vfio_get_device_info(int fd); -int vfio_get_device(VFIOGroup *group, const char *name, - VFIODevice *vbasedev, Error **errp); int vfio_attach_device(char *name, VFIODevice *vbasedev, AddressSpace *as, Error **errp); void vfio_detach_device(VFIODevice *vbasedev); diff --git a/hw/vfio/ccw.c b/hw/vfio/ccw.c index 1e2fce83b0..6623ae237b 100644 --- a/hw/vfio/ccw.c +++ b/hw/vfio/ccw.c @@ -572,88 +572,14 @@ static void vfio_ccw_put_region(VFIOCCWDevice *vcdev) g_free(vcdev->io_region); } -static void vfio_ccw_put_device(VFIOCCWDevice *vcdev) -{ - g_free(vcdev->vdev.name); - vfio_put_base_device(&vcdev->vdev); -} - -static void vfio_ccw_get_device(VFIOGroup *group, VFIOCCWDevice *vcdev, - Error **errp) -{ - S390CCWDevice *cdev = S390_CCW_DEVICE(vcdev); - char *name = g_strdup_printf("%x.%x.%04x", cdev->hostid.cssid, - cdev->hostid.ssid, - cdev->hostid.devid); - VFIODevice *vbasedev; - - QLIST_FOREACH(vbasedev, &group->device_list, next) { - if (strcmp(vbasedev->name, name) == 0) { - error_setg(errp, "vfio: subchannel %s has already been attached", - name); - goto out_err; - } - } - - /* - * All vfio-ccw devices are believed to operate in a way compatible with - * discarding of memory in RAM blocks, ie. pages pinned in the host are - * in the current working set of the guest driver and therefore never - * overlap e.g., with pages available to the guest balloon driver. This - * needs to be set before vfio_get_device() for vfio common to handle - * ram_block_discard_disable(). - */ - vcdev->vdev.ram_block_discard_allowed = true; - - if (vfio_get_device(group, cdev->mdevid, &vcdev->vdev, errp)) { - goto out_err; - } - - vcdev->vdev.ops = &vfio_ccw_ops; - vcdev->vdev.type = VFIO_DEVICE_TYPE_CCW; - vcdev->vdev.name = name; - vcdev->vdev.dev = DEVICE(vcdev); - - return; - -out_err: - g_free(name); -} - -static VFIOGroup *vfio_ccw_get_group(S390CCWDevice *cdev, Error **errp) -{ - char *tmp, group_path[PATH_MAX]; - ssize_t len; - int groupid; - - tmp = g_strdup_printf("/sys/bus/css/devices/%x.%x.%04x/%s/iommu_group", - cdev->hostid.cssid, cdev->hostid.ssid, - cdev->hostid.devid, cdev->mdevid); - len = readlink(tmp, group_path, sizeof(group_path)); - g_free(tmp); - - if (len <= 0 || len >= sizeof(group_path)) { - error_setg(errp, "vfio: no iommu_group found"); - return NULL; - } - - group_path[len] = 0; - - if (sscanf(basename(group_path), "%d", &groupid) != 1) { - error_setg(errp, "vfio: failed to read %s", group_path); - return NULL; - } - - return vfio_get_group(groupid, &address_space_memory, errp); -} - static void vfio_ccw_realize(DeviceState *dev, Error **errp) { - VFIOGroup *group; S390CCWDevice *cdev = S390_CCW_DEVICE(dev); VFIOCCWDevice *vcdev = VFIO_CCW(cdev); S390CCWDeviceClass *cdc = S390_CCW_DEVICE_GET_CLASS(cdev); + VFIODevice *vbasedev = &vcdev->vdev; Error *err = NULL; + int ret; /* Call the class init function for subchannel. */ if (cdc->realize) { @@ -663,14 +589,27 @@ static void vfio_ccw_realize(DeviceState *dev, Error **errp) } } - group = vfio_ccw_get_group(cdev, &err); - if (!group) { - goto out_group_err; - } + vbasedev->ops = &vfio_ccw_ops; + vbasedev->type = VFIO_DEVICE_TYPE_CCW; + vbasedev->name = g_strdup_printf("%x.%x.%04x", vcdev->cdev.hostid.cssid, + vcdev->cdev.hostid.ssid, + vcdev->cdev.hostid.devid); + vbasedev->dev = dev; - vfio_ccw_get_device(group, vcdev, &err); - if (err) { - goto out_device_err; + /* + * All vfio-ccw devices are believed to operate in a way compatible with + * discarding of memory in RAM blocks, ie. pages pinned in the host are + * in the current working set of the guest driver and therefore never + * overlap e.g., with pages available to the guest balloon driver. This + * needs to be set before vfio_get_device() for vfio common to handle + * ram_block_discard_disable(). + */ + vbasedev->ram_block_discard_allowed = true; + + ret = vfio_attach_device(cdev->mdevid, vbasedev, + &address_space_memory, errp); + if (ret) { + goto out_attach_dev_err; } vfio_ccw_get_region(vcdev, &err); @@ -708,10 +647,9 @@ out_irq_notifier_err: out_io_notifier_err: vfio_ccw_put_region(vcdev); out_region_err: - vfio_ccw_put_device(vcdev); -out_device_err: - vfio_put_group(group); -out_group_err: + vfio_detach_device(vbasedev); +out_attach_dev_err: + g_free(vbasedev->name); if (cdc->unrealize) { cdc->unrealize(cdev); } @@ -724,14 +662,13 @@ static void vfio_ccw_unrealize(DeviceState *dev) S390CCWDevice *cdev = S390_CCW_DEVICE(dev); VFIOCCWDevice *vcdev = VFIO_CCW(cdev); S390CCWDeviceClass *cdc = S390_CCW_DEVICE_GET_CLASS(cdev); - VFIOGroup *group = vcdev->vdev.group; vfio_ccw_unregister_irq_notifier(vcdev, VFIO_CCW_REQ_IRQ_INDEX); vfio_ccw_unregister_irq_notifier(vcdev, VFIO_CCW_CRW_IRQ_INDEX); vfio_ccw_unregister_irq_notifier(vcdev, VFIO_CCW_IO_IRQ_INDEX); vfio_ccw_put_region(vcdev); - vfio_ccw_put_device(vcdev); - vfio_put_group(group); + vfio_detach_device(&vcdev->vdev); + g_free(vcdev->vdev.name); if (cdc->unrealize) { cdc->unrealize(cdev); diff --git a/hw/vfio/common.c b/hw/vfio/common.c index f4c33c9858..56cfe94d97 100644 --- a/hw/vfio/common.c +++ b/hw/vfio/common.c @@ -2335,7 +2335,7 @@ static void vfio_disconnect_container(VFIOGroup *group) } } -VFIOGroup *vfio_get_group(int groupid, AddressSpace *as, Error **errp) +static VFIOGroup *vfio_get_group(int groupid, AddressSpace *as, Error **errp) { VFIOGroup *group; char path[32]; @@ -2402,7 +2402,7 @@ free_group_exit: return NULL; } -void vfio_put_group(VFIOGroup *group) +static void vfio_put_group(VFIOGroup *group) { if (!group || !QLIST_EMPTY(&group->device_list)) { return; @@ -2447,8 +2447,8 @@ retry: return info; } -int vfio_get_device(VFIOGroup *group, const char *name, - VFIODevice *vbasedev, Error **errp) +static int vfio_get_device(VFIOGroup *group, const char *name, + VFIODevice *vbasedev, Error **errp) { g_autofree struct vfio_device_info *info = NULL; int fd; @@ -2506,7 +2506,7 @@ int vfio_get_device(VFIOGroup *group, const char *name, return 0; } -void vfio_put_base_device(VFIODevice *vbasedev) +static void vfio_put_base_device(VFIODevice *vbasedev) { if (!vbasedev->group) { return;