From patchwork Wed Oct 23 13:07:47 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jason Wang X-Patchwork-Id: 11206793 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 8E44A139A for ; Wed, 23 Oct 2019 13:14:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5AB6E21925 for ; Wed, 23 Oct 2019 13:14:33 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="FFzYOHOp" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2404801AbfJWNOc (ORCPT ); Wed, 23 Oct 2019 09:14:32 -0400 Received: from us-smtp-2.mimecast.com ([207.211.31.81]:26887 "EHLO us-smtp-delivery-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1731608AbfJWNO3 (ORCPT ); Wed, 23 Oct 2019 09:14:29 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1571836467; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=TjCPajc4CEGR5rS6ag/k9ArXmJclaoe4P99dbfRjJ0k=; b=FFzYOHOp5bgyHv0UgvTqBFGERcfrWY5YIROkg1QANj2GybafZtrmKe1680U4G+H24Ghz6Y mO2Yz0wBjfsBX6lcXr5FZpdSPO0qofxjmsll8qcN50SXCv0LVx4Ss5CWnW8OlnGu3GbDLZ nVESK3Mlw3hvDFsd3USaekz2a6OnFTo= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-295-p1Bzi35XNCiDsbI1W_34VA-1; Wed, 23 Oct 2019 09:14:23 -0400 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 5AA7B800D58; Wed, 23 Oct 2019 13:14:17 +0000 (UTC) Received: from jason-ThinkPad-X1-Carbon-6th.redhat.com (ovpn-12-126.pek2.redhat.com [10.72.12.126]) by smtp.corp.redhat.com (Postfix) with ESMTP id 90B7460161; Wed, 23 Oct 2019 13:11:00 +0000 (UTC) From: Jason Wang To: kvm@vger.kernel.org, linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, intel-gvt-dev@lists.freedesktop.org, kwankhede@nvidia.com, alex.williamson@redhat.com, mst@redhat.com, tiwei.bie@intel.com Cc: virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, cohuck@redhat.com, maxime.coquelin@redhat.com, cunming.liang@intel.com, zhihong.wang@intel.com, rob.miller@broadcom.com, xiao.w.wang@intel.com, haotian.wang@sifive.com, zhenyuw@linux.intel.com, zhi.a.wang@intel.com, jani.nikula@linux.intel.com, joonas.lahtinen@linux.intel.com, rodrigo.vivi@intel.com, airlied@linux.ie, daniel@ffwll.ch, farman@linux.ibm.com, pasic@linux.ibm.com, sebott@linux.ibm.com, oberpar@linux.ibm.com, heiko.carstens@de.ibm.com, gor@linux.ibm.com, borntraeger@de.ibm.com, akrowiak@linux.ibm.com, freude@linux.ibm.com, lingshan.zhu@intel.com, idos@mellanox.com, eperezma@redhat.com, lulu@redhat.com, parav@mellanox.com, christophe.de.dinechin@gmail.com, kevin.tian@intel.com, stefanha@redhat.com, Jason Wang Subject: [PATCH V5 1/6] mdev: class id support Date: Wed, 23 Oct 2019 21:07:47 +0800 Message-Id: <20191023130752.18980-2-jasowang@redhat.com> In-Reply-To: <20191023130752.18980-1-jasowang@redhat.com> References: <20191023130752.18980-1-jasowang@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-MC-Unique: p1Bzi35XNCiDsbI1W_34VA-1 X-Mimecast-Spam-Score: 0 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Mdev bus only supports vfio driver right now, so it doesn't implement match method. But in the future, we may add drivers other than vfio, the first driver could be virtio-mdev. This means we need to add device class id support in bus match method to pair the mdev device and mdev driver correctly. So this patch adds id_table to mdev_driver and class_id for mdev device with the match method for mdev bus. Signed-off-by: Jason Wang Reviewed-by: Parav Pandit --- .../driver-api/vfio-mediated-device.rst | 5 +++++ drivers/gpu/drm/i915/gvt/kvmgt.c | 1 + drivers/s390/cio/vfio_ccw_ops.c | 1 + drivers/s390/crypto/vfio_ap_ops.c | 1 + drivers/vfio/mdev/mdev_core.c | 18 +++++++++++++++ drivers/vfio/mdev/mdev_driver.c | 22 +++++++++++++++++++ drivers/vfio/mdev/mdev_private.h | 1 + drivers/vfio/mdev/vfio_mdev.c | 6 +++++ include/linux/mdev.h | 8 +++++++ include/linux/mod_devicetable.h | 8 +++++++ samples/vfio-mdev/mbochs.c | 1 + samples/vfio-mdev/mdpy.c | 1 + samples/vfio-mdev/mtty.c | 1 + 13 files changed, 74 insertions(+) diff --git a/Documentation/driver-api/vfio-mediated-device.rst b/Documentation/driver-api/vfio-mediated-device.rst index 25eb7d5b834b..6709413bee29 100644 --- a/Documentation/driver-api/vfio-mediated-device.rst +++ b/Documentation/driver-api/vfio-mediated-device.rst @@ -102,12 +102,14 @@ structure to represent a mediated device's driver:: * @probe: called when new device created * @remove: called when device removed * @driver: device driver structure + * @id_table: the ids serviced by this driver */ struct mdev_driver { const char *name; int (*probe) (struct device *dev); void (*remove) (struct device *dev); struct device_driver driver; + const struct mdev_class_id *id_table; }; A mediated bus driver for mdev should use this structure in the function calls @@ -170,6 +172,9 @@ that a driver should use to unregister itself with the mdev core driver:: extern void mdev_unregister_device(struct device *dev); +It is also required to specify the class_id in create() callback through:: + + int mdev_set_class(struct mdev_device *mdev, u16 id); Mediated Device Management Interface Through sysfs ================================================== diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c index 343d79c1cb7e..6420f0dbd31b 100644 --- a/drivers/gpu/drm/i915/gvt/kvmgt.c +++ b/drivers/gpu/drm/i915/gvt/kvmgt.c @@ -678,6 +678,7 @@ static int intel_vgpu_create(struct kobject *kobj, struct mdev_device *mdev) dev_name(mdev_dev(mdev))); ret = 0; + mdev_set_class(mdev, MDEV_CLASS_ID_VFIO); out: return ret; } diff --git a/drivers/s390/cio/vfio_ccw_ops.c b/drivers/s390/cio/vfio_ccw_ops.c index f0d71ab77c50..cf2c013ae32f 100644 --- a/drivers/s390/cio/vfio_ccw_ops.c +++ b/drivers/s390/cio/vfio_ccw_ops.c @@ -129,6 +129,7 @@ static int vfio_ccw_mdev_create(struct kobject *kobj, struct mdev_device *mdev) private->sch->schid.ssid, private->sch->schid.sch_no); + mdev_set_class(mdev, MDEV_CLASS_ID_VFIO); return 0; } diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c index 5c0f53c6dde7..07c31070afeb 100644 --- a/drivers/s390/crypto/vfio_ap_ops.c +++ b/drivers/s390/crypto/vfio_ap_ops.c @@ -343,6 +343,7 @@ static int vfio_ap_mdev_create(struct kobject *kobj, struct mdev_device *mdev) list_add(&matrix_mdev->node, &matrix_dev->mdev_list); mutex_unlock(&matrix_dev->lock); + mdev_set_class(mdev, MDEV_CLASS_ID_VFIO); return 0; } diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c index b558d4cfd082..3a9c52d71b4e 100644 --- a/drivers/vfio/mdev/mdev_core.c +++ b/drivers/vfio/mdev/mdev_core.c @@ -45,6 +45,16 @@ void mdev_set_drvdata(struct mdev_device *mdev, void *data) } EXPORT_SYMBOL(mdev_set_drvdata); +/* Specify the class for the mdev device, this must be called during + * create() callback. + */ +void mdev_set_class(struct mdev_device *mdev, u16 id) +{ + WARN_ON(mdev->class_id); + mdev->class_id = id; +} +EXPORT_SYMBOL(mdev_set_class); + struct device *mdev_dev(struct mdev_device *mdev) { return &mdev->dev; @@ -135,6 +145,7 @@ static int mdev_device_remove_cb(struct device *dev, void *data) * mdev_register_device : Register a device * @dev: device structure representing parent device. * @ops: Parent device operation structure to be registered. + * @id: class id. * * Add device to list of registered parent devices. * Returns a negative value on error, otherwise 0. @@ -324,6 +335,13 @@ int mdev_device_create(struct kobject *kobj, if (ret) goto ops_create_fail; + if (!mdev->class_id) { + ret = -EINVAL; + WARN(1, "class id must be specified for device %s\n", + dev_name(dev)); + goto add_fail; + } + ret = device_add(&mdev->dev); if (ret) goto add_fail; diff --git a/drivers/vfio/mdev/mdev_driver.c b/drivers/vfio/mdev/mdev_driver.c index 0d3223aee20b..319d886ffaf7 100644 --- a/drivers/vfio/mdev/mdev_driver.c +++ b/drivers/vfio/mdev/mdev_driver.c @@ -69,8 +69,30 @@ static int mdev_remove(struct device *dev) return 0; } +static int mdev_match(struct device *dev, struct device_driver *drv) +{ + unsigned int i; + struct mdev_device *mdev = to_mdev_device(dev); + struct mdev_driver *mdrv = to_mdev_driver(drv); + const struct mdev_class_id *ids = mdrv->id_table; + + for (i = 0; ids[i].id; i++) + if (ids[i].id == mdev->class_id) + return 1; + return 0; +} + +static int mdev_uevent(struct device *dev, struct kobj_uevent_env *env) +{ + struct mdev_device *mdev = to_mdev_device(dev); + + return add_uevent_var(env, "MODALIAS=mdev:c%02X", mdev->class_id); +} + struct bus_type mdev_bus_type = { .name = "mdev", + .match = mdev_match, + .uevent = mdev_uevent, .probe = mdev_probe, .remove = mdev_remove, }; diff --git a/drivers/vfio/mdev/mdev_private.h b/drivers/vfio/mdev/mdev_private.h index 7d922950caaf..c65f436c1869 100644 --- a/drivers/vfio/mdev/mdev_private.h +++ b/drivers/vfio/mdev/mdev_private.h @@ -33,6 +33,7 @@ struct mdev_device { struct kobject *type_kobj; struct device *iommu_device; bool active; + u16 class_id; }; #define to_mdev_device(dev) container_of(dev, struct mdev_device, dev) diff --git a/drivers/vfio/mdev/vfio_mdev.c b/drivers/vfio/mdev/vfio_mdev.c index 30964a4e0a28..7b24ee9cb8dd 100644 --- a/drivers/vfio/mdev/vfio_mdev.c +++ b/drivers/vfio/mdev/vfio_mdev.c @@ -120,10 +120,16 @@ static void vfio_mdev_remove(struct device *dev) vfio_del_group_dev(dev); } +static const struct mdev_class_id id_table[] = { + { MDEV_CLASS_ID_VFIO }, + { 0 }, +}; + static struct mdev_driver vfio_mdev_driver = { .name = "vfio_mdev", .probe = vfio_mdev_probe, .remove = vfio_mdev_remove, + .id_table = id_table, }; static int __init vfio_mdev_init(void) diff --git a/include/linux/mdev.h b/include/linux/mdev.h index 0ce30ca78db0..78b69d09eb54 100644 --- a/include/linux/mdev.h +++ b/include/linux/mdev.h @@ -118,6 +118,7 @@ struct mdev_type_attribute mdev_type_attr_##_name = \ * @probe: called when new device created * @remove: called when device removed * @driver: device driver structure + * @id_table: the ids serviced by this driver * **/ struct mdev_driver { @@ -125,6 +126,7 @@ struct mdev_driver { int (*probe)(struct device *dev); void (*remove)(struct device *dev); struct device_driver driver; + const struct mdev_class_id *id_table; }; #define to_mdev_driver(drv) container_of(drv, struct mdev_driver, driver) @@ -132,6 +134,7 @@ struct mdev_driver { void *mdev_get_drvdata(struct mdev_device *mdev); void mdev_set_drvdata(struct mdev_device *mdev, void *data); const guid_t *mdev_uuid(struct mdev_device *mdev); +void mdev_set_class(struct mdev_device *mdev, u16 id); extern struct bus_type mdev_bus_type; @@ -145,4 +148,9 @@ struct device *mdev_parent_dev(struct mdev_device *mdev); struct device *mdev_dev(struct mdev_device *mdev); struct mdev_device *mdev_from_dev(struct device *dev); +enum { + MDEV_CLASS_ID_VFIO = 1, + /* New entries must be added here */ +}; + #endif /* MDEV_H */ diff --git a/include/linux/mod_devicetable.h b/include/linux/mod_devicetable.h index 5714fd35a83c..f32c6e44fb1a 100644 --- a/include/linux/mod_devicetable.h +++ b/include/linux/mod_devicetable.h @@ -821,4 +821,12 @@ struct wmi_device_id { const void *context; }; +/** + * struct mdev_class_id - MDEV device class identifier + * @id: Used to identify a specific class of device, e.g vfio-mdev device. + */ +struct mdev_class_id { + __u16 id; +}; + #endif /* LINUX_MOD_DEVICETABLE_H */ diff --git a/samples/vfio-mdev/mbochs.c b/samples/vfio-mdev/mbochs.c index ac5c8c17b1ff..115bc5074656 100644 --- a/samples/vfio-mdev/mbochs.c +++ b/samples/vfio-mdev/mbochs.c @@ -561,6 +561,7 @@ static int mbochs_create(struct kobject *kobj, struct mdev_device *mdev) mbochs_reset(mdev); mbochs_used_mbytes += type->mbytes; + mdev_set_class(mdev, MDEV_CLASS_ID_VFIO); return 0; err_mem: diff --git a/samples/vfio-mdev/mdpy.c b/samples/vfio-mdev/mdpy.c index cc86bf6566e4..665614574d50 100644 --- a/samples/vfio-mdev/mdpy.c +++ b/samples/vfio-mdev/mdpy.c @@ -269,6 +269,7 @@ static int mdpy_create(struct kobject *kobj, struct mdev_device *mdev) mdpy_reset(mdev); mdpy_count++; + mdev_set_class(mdev, MDEV_CLASS_ID_VFIO); return 0; } diff --git a/samples/vfio-mdev/mtty.c b/samples/vfio-mdev/mtty.c index ce84a300a4da..90da12ff7fd9 100644 --- a/samples/vfio-mdev/mtty.c +++ b/samples/vfio-mdev/mtty.c @@ -755,6 +755,7 @@ static int mtty_create(struct kobject *kobj, struct mdev_device *mdev) list_add(&mdev_state->next, &mdev_devices_list); mutex_unlock(&mdev_list_lock); + mdev_set_class(mdev, MDEV_CLASS_ID_VFIO); return 0; } From patchwork Wed Oct 23 13:07:48 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jason Wang X-Patchwork-Id: 11206795 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 46E7C112B for ; Wed, 23 Oct 2019 13:16:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 24E5E21872 for ; Wed, 23 Oct 2019 13:16:48 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="NWFhLywu" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2391178AbfJWNQr (ORCPT ); Wed, 23 Oct 2019 09:16:47 -0400 Received: from us-smtp-1.mimecast.com ([205.139.110.61]:45792 "EHLO us-smtp-delivery-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1733261AbfJWNQr (ORCPT ); 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Wed, 23 Oct 2019 13:16:36 +0000 (UTC) Received: from jason-ThinkPad-X1-Carbon-6th.redhat.com (ovpn-12-126.pek2.redhat.com [10.72.12.126]) by smtp.corp.redhat.com (Postfix) with ESMTP id 9997D60126; Wed, 23 Oct 2019 13:14:25 +0000 (UTC) From: Jason Wang To: kvm@vger.kernel.org, linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, intel-gvt-dev@lists.freedesktop.org, kwankhede@nvidia.com, alex.williamson@redhat.com, mst@redhat.com, tiwei.bie@intel.com Cc: virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, cohuck@redhat.com, maxime.coquelin@redhat.com, cunming.liang@intel.com, zhihong.wang@intel.com, rob.miller@broadcom.com, xiao.w.wang@intel.com, haotian.wang@sifive.com, zhenyuw@linux.intel.com, zhi.a.wang@intel.com, jani.nikula@linux.intel.com, joonas.lahtinen@linux.intel.com, rodrigo.vivi@intel.com, airlied@linux.ie, daniel@ffwll.ch, farman@linux.ibm.com, pasic@linux.ibm.com, sebott@linux.ibm.com, oberpar@linux.ibm.com, heiko.carstens@de.ibm.com, gor@linux.ibm.com, borntraeger@de.ibm.com, akrowiak@linux.ibm.com, freude@linux.ibm.com, lingshan.zhu@intel.com, idos@mellanox.com, eperezma@redhat.com, lulu@redhat.com, parav@mellanox.com, christophe.de.dinechin@gmail.com, kevin.tian@intel.com, stefanha@redhat.com, Jason Wang Subject: [PATCH V5 2/6] modpost: add support for mdev class id Date: Wed, 23 Oct 2019 21:07:48 +0800 Message-Id: <20191023130752.18980-3-jasowang@redhat.com> In-Reply-To: <20191023130752.18980-1-jasowang@redhat.com> References: <20191023130752.18980-1-jasowang@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-MC-Unique: n84wmhJgPQC0N_OluIU2Vg-1 X-Mimecast-Spam-Score: 0 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Add support to parse mdev class id table. Reviewed-by: Parav Pandit Signed-off-by: Jason Wang --- drivers/vfio/mdev/vfio_mdev.c | 2 ++ scripts/mod/devicetable-offsets.c | 3 +++ scripts/mod/file2alias.c | 10 ++++++++++ 3 files changed, 15 insertions(+) diff --git a/drivers/vfio/mdev/vfio_mdev.c b/drivers/vfio/mdev/vfio_mdev.c index 7b24ee9cb8dd..cb701cd646f0 100644 --- a/drivers/vfio/mdev/vfio_mdev.c +++ b/drivers/vfio/mdev/vfio_mdev.c @@ -125,6 +125,8 @@ static const struct mdev_class_id id_table[] = { { 0 }, }; +MODULE_DEVICE_TABLE(mdev, id_table); + static struct mdev_driver vfio_mdev_driver = { .name = "vfio_mdev", .probe = vfio_mdev_probe, diff --git a/scripts/mod/devicetable-offsets.c b/scripts/mod/devicetable-offsets.c index 054405b90ba4..6cbb1062488a 100644 --- a/scripts/mod/devicetable-offsets.c +++ b/scripts/mod/devicetable-offsets.c @@ -231,5 +231,8 @@ int main(void) DEVID(wmi_device_id); DEVID_FIELD(wmi_device_id, guid_string); + DEVID(mdev_class_id); + DEVID_FIELD(mdev_class_id, id); + return 0; } diff --git a/scripts/mod/file2alias.c b/scripts/mod/file2alias.c index c91eba751804..d365dfe7c718 100644 --- a/scripts/mod/file2alias.c +++ b/scripts/mod/file2alias.c @@ -1335,6 +1335,15 @@ static int do_wmi_entry(const char *filename, void *symval, char *alias) return 1; } +/* looks like: "mdev:cN" */ +static int do_mdev_entry(const char *filename, void *symval, char *alias) +{ + DEF_FIELD(symval, mdev_class_id, id); + + sprintf(alias, "mdev:c%02X", id); + return 1; +} + /* Does namelen bytes of name exactly match the symbol? */ static bool sym_is(const char *name, unsigned namelen, const char *symbol) { @@ -1407,6 +1416,7 @@ static const struct devtable devtable[] = { {"typec", SIZE_typec_device_id, do_typec_entry}, {"tee", SIZE_tee_client_device_id, do_tee_entry}, {"wmi", SIZE_wmi_device_id, do_wmi_entry}, + {"mdev", SIZE_mdev_class_id, do_mdev_entry}, }; /* Create MODULE_ALIAS() statements. From patchwork Wed Oct 23 13:07:49 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jason Wang X-Patchwork-Id: 11206805 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 728E21951 for ; Wed, 23 Oct 2019 13:20:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 21B9F21D7F for ; Wed, 23 Oct 2019 13:20:30 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="FHpWgRZ2" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2391307AbfJWNUZ (ORCPT ); Wed, 23 Oct 2019 09:20:25 -0400 Received: from us-smtp-delivery-1.mimecast.com ([205.139.110.120]:41178 "EHLO us-smtp-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727154AbfJWNUZ (ORCPT ); Wed, 23 Oct 2019 09:20:25 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1571836823; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=opq2O0uAIb2rOPM696VZ1hY0z0VE61e9v+wVKE49h40=; b=FHpWgRZ2EWrlg7dh+DqrFLqxgjbWpERW9VoijpfV7r6iUE/lBBXVN2S1LbkLT3f7zlmGzj Xgy+7n+YFG1xzNckxNxnNczqiviqy5LDiEsO+3PVwViHYr2FEzrMVZTb45/fakGZ9tFMnZ ijq0naPLT8UtG1e+qxGapG3Y05od0dk= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-34-A1YZp_-QOCCkE0zUdrBMYw-1; Wed, 23 Oct 2019 09:20:19 -0400 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 655E2107AD31; Wed, 23 Oct 2019 13:20:15 +0000 (UTC) Received: from jason-ThinkPad-X1-Carbon-6th.redhat.com (ovpn-12-126.pek2.redhat.com [10.72.12.126]) by smtp.corp.redhat.com (Postfix) with ESMTP id 206E7600CC; Wed, 23 Oct 2019 13:16:37 +0000 (UTC) From: Jason Wang To: kvm@vger.kernel.org, linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, intel-gvt-dev@lists.freedesktop.org, kwankhede@nvidia.com, alex.williamson@redhat.com, mst@redhat.com, tiwei.bie@intel.com Cc: virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, cohuck@redhat.com, maxime.coquelin@redhat.com, cunming.liang@intel.com, zhihong.wang@intel.com, rob.miller@broadcom.com, xiao.w.wang@intel.com, haotian.wang@sifive.com, zhenyuw@linux.intel.com, zhi.a.wang@intel.com, jani.nikula@linux.intel.com, joonas.lahtinen@linux.intel.com, rodrigo.vivi@intel.com, airlied@linux.ie, daniel@ffwll.ch, farman@linux.ibm.com, pasic@linux.ibm.com, sebott@linux.ibm.com, oberpar@linux.ibm.com, heiko.carstens@de.ibm.com, gor@linux.ibm.com, borntraeger@de.ibm.com, akrowiak@linux.ibm.com, freude@linux.ibm.com, lingshan.zhu@intel.com, idos@mellanox.com, eperezma@redhat.com, lulu@redhat.com, parav@mellanox.com, christophe.de.dinechin@gmail.com, kevin.tian@intel.com, stefanha@redhat.com, Jason Wang Subject: [PATCH V5 3/6] mdev: introduce device specific ops Date: Wed, 23 Oct 2019 21:07:49 +0800 Message-Id: <20191023130752.18980-4-jasowang@redhat.com> In-Reply-To: <20191023130752.18980-1-jasowang@redhat.com> References: <20191023130752.18980-1-jasowang@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-MC-Unique: A1YZp_-QOCCkE0zUdrBMYw-1 X-Mimecast-Spam-Score: 0 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Currently, except for the create and remove, the rest of mdev_parent_ops is designed for vfio-mdev driver only and may not help for kernel mdev driver. With the help of class id, this patch introduces device specific callbacks inside mdev_device structure. This allows different set of callback to be used by vfio-mdev and virtio-mdev. Signed-off-by: Jason Wang --- .../driver-api/vfio-mediated-device.rst | 35 +++++++++---- MAINTAINERS | 1 + drivers/gpu/drm/i915/gvt/kvmgt.c | 18 ++++--- drivers/s390/cio/vfio_ccw_ops.c | 18 ++++--- drivers/s390/crypto/vfio_ap_ops.c | 14 +++-- drivers/vfio/mdev/mdev_core.c | 25 ++++++++- drivers/vfio/mdev/mdev_private.h | 5 ++ drivers/vfio/mdev/vfio_mdev.c | 37 ++++++------- include/linux/mdev.h | 43 ++++----------- include/linux/vfio_mdev_ops.h | 52 +++++++++++++++++++ samples/vfio-mdev/mbochs.c | 20 ++++--- samples/vfio-mdev/mdpy.c | 20 ++++--- samples/vfio-mdev/mtty.c | 18 ++++--- 13 files changed, 206 insertions(+), 100 deletions(-) create mode 100644 include/linux/vfio_mdev_ops.h diff --git a/Documentation/driver-api/vfio-mediated-device.rst b/Documentation/driver-api/vfio-mediated-device.rst index 6709413bee29..0d8f9e7d7983 100644 --- a/Documentation/driver-api/vfio-mediated-device.rst +++ b/Documentation/driver-api/vfio-mediated-device.rst @@ -152,15 +152,6 @@ callbacks per mdev parent device, per mdev type, or any other categorization. Vendor drivers are expected to be fully asynchronous in this respect or provide their own internal resource protection.) -The callbacks in the mdev_parent_ops structure are as follows: - -* open: open callback of mediated device -* close: close callback of mediated device -* ioctl: ioctl callback of mediated device -* read : read emulation callback -* write: write emulation callback -* mmap: mmap emulation callback - A driver should use the mdev_parent_ops structure in the function call to register itself with the mdev core driver:: @@ -172,10 +163,34 @@ that a driver should use to unregister itself with the mdev core driver:: extern void mdev_unregister_device(struct device *dev); -It is also required to specify the class_id in create() callback through:: +As multiple types of mediated devices may be supported, class id needs +to be specified in the create callback(). This could be done +explicitly for the device that does not use on mdev bus for its +operation through: int mdev_set_class(struct mdev_device *mdev, u16 id); +For the device that uses on the mdev bus for its operation, the class +should provide helper function to set class id and device specific +ops. E.g for vfio-mdev devices, the function to be called is:: + + int mdev_set_vfio_ops(struct mdev_device *mdev, + const struct vfio_mdev_ops *vfio_ops); + +The class id (set by this function to MDEV_CLASS_ID_VFIO) is used to +match a device with an mdev driver via its id table. The device +specific callbacks (specified in *vfio_ops) are obtainable via +mdev_get_vfio_ops() (for use by the mdev bus driver). A vfio-mdev +device (class id MDEV_CLASS_ID_VFIO) uses the following +device-specific ops: + +* open: open callback of vfio mediated device +* close: close callback of vfio mediated device +* ioctl: ioctl callback of vfio mediated device +* read : read emulation callback +* write: write emulation callback +* mmap: mmap emulation callback + Mediated Device Management Interface Through sysfs ================================================== diff --git a/MAINTAINERS b/MAINTAINERS index e51a68bf8ca8..9e10ae9c2b4d 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -17121,6 +17121,7 @@ S: Maintained F: Documentation/driver-api/vfio-mediated-device.rst F: drivers/vfio/mdev/ F: include/linux/mdev.h +F: include/linux/vfio_mdev_ops.h F: samples/vfio-mdev/ VFIO PLATFORM DRIVER diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c index 6420f0dbd31b..c2b7f9dbe4d1 100644 --- a/drivers/gpu/drm/i915/gvt/kvmgt.c +++ b/drivers/gpu/drm/i915/gvt/kvmgt.c @@ -42,6 +42,7 @@ #include #include #include +#include #include #include @@ -643,6 +644,8 @@ static void kvmgt_put_vfio_device(void *vgpu) vfio_device_put(((struct intel_vgpu *)vgpu)->vdev.vfio_device); } +static const struct vfio_mdev_device_ops intel_vfio_vgpu_dev_ops; + static int intel_vgpu_create(struct kobject *kobj, struct mdev_device *mdev) { struct intel_vgpu *vgpu = NULL; @@ -678,7 +681,7 @@ static int intel_vgpu_create(struct kobject *kobj, struct mdev_device *mdev) dev_name(mdev_dev(mdev))); ret = 0; - mdev_set_class(mdev, MDEV_CLASS_ID_VFIO); + mdev_set_vfio_ops(mdev, &intel_vfio_vgpu_dev_ops); out: return ret; } @@ -1599,20 +1602,21 @@ static const struct attribute_group *intel_vgpu_groups[] = { NULL, }; -static struct mdev_parent_ops intel_vgpu_ops = { - .mdev_attr_groups = intel_vgpu_groups, - .create = intel_vgpu_create, - .remove = intel_vgpu_remove, - +static const struct vfio_mdev_device_ops intel_vfio_vgpu_dev_ops = { .open = intel_vgpu_open, .release = intel_vgpu_release, - .read = intel_vgpu_read, .write = intel_vgpu_write, .mmap = intel_vgpu_mmap, .ioctl = intel_vgpu_ioctl, }; +static struct mdev_parent_ops intel_vgpu_ops = { + .mdev_attr_groups = intel_vgpu_groups, + .create = intel_vgpu_create, + .remove = intel_vgpu_remove, +}; + static int kvmgt_host_init(struct device *dev, void *gvt, const void *ops) { struct attribute **kvm_type_attrs; diff --git a/drivers/s390/cio/vfio_ccw_ops.c b/drivers/s390/cio/vfio_ccw_ops.c index cf2c013ae32f..c36e6ca9ee65 100644 --- a/drivers/s390/cio/vfio_ccw_ops.c +++ b/drivers/s390/cio/vfio_ccw_ops.c @@ -12,6 +12,7 @@ #include #include +#include #include #include @@ -110,6 +111,8 @@ static struct attribute_group *mdev_type_groups[] = { NULL, }; +static const struct vfio_mdev_device_ops vfio_mdev_ops; + static int vfio_ccw_mdev_create(struct kobject *kobj, struct mdev_device *mdev) { struct vfio_ccw_private *private = @@ -129,7 +132,7 @@ static int vfio_ccw_mdev_create(struct kobject *kobj, struct mdev_device *mdev) private->sch->schid.ssid, private->sch->schid.sch_no); - mdev_set_class(mdev, MDEV_CLASS_ID_VFIO); + mdev_set_vfio_ops(mdev, &vfio_mdev_ops); return 0; } @@ -575,11 +578,7 @@ static ssize_t vfio_ccw_mdev_ioctl(struct mdev_device *mdev, } } -static const struct mdev_parent_ops vfio_ccw_mdev_ops = { - .owner = THIS_MODULE, - .supported_type_groups = mdev_type_groups, - .create = vfio_ccw_mdev_create, - .remove = vfio_ccw_mdev_remove, +static const struct vfio_mdev_device_ops vfio_mdev_ops = { .open = vfio_ccw_mdev_open, .release = vfio_ccw_mdev_release, .read = vfio_ccw_mdev_read, @@ -587,6 +586,13 @@ static const struct mdev_parent_ops vfio_ccw_mdev_ops = { .ioctl = vfio_ccw_mdev_ioctl, }; +static const struct mdev_parent_ops vfio_ccw_mdev_ops = { + .owner = THIS_MODULE, + .supported_type_groups = mdev_type_groups, + .create = vfio_ccw_mdev_create, + .remove = vfio_ccw_mdev_remove, +}; + int vfio_ccw_mdev_reg(struct subchannel *sch) { return mdev_register_device(&sch->dev, &vfio_ccw_mdev_ops); diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c index 07c31070afeb..ed68d4f7c0a9 100644 --- a/drivers/s390/crypto/vfio_ap_ops.c +++ b/drivers/s390/crypto/vfio_ap_ops.c @@ -16,6 +16,7 @@ #include #include #include +#include #include #include @@ -321,6 +322,8 @@ static void vfio_ap_matrix_init(struct ap_config_info *info, matrix->adm_max = info->apxa ? info->Nd : 15; } +static const struct vfio_mdev_device_ops vfio_mdev_ops; + static int vfio_ap_mdev_create(struct kobject *kobj, struct mdev_device *mdev) { struct ap_matrix_mdev *matrix_mdev; @@ -343,7 +346,7 @@ static int vfio_ap_mdev_create(struct kobject *kobj, struct mdev_device *mdev) list_add(&matrix_mdev->node, &matrix_dev->mdev_list); mutex_unlock(&matrix_dev->lock); - mdev_set_class(mdev, MDEV_CLASS_ID_VFIO); + mdev_set_vfio_ops(mdev, &vfio_mdev_ops); return 0; } @@ -1281,15 +1284,18 @@ static ssize_t vfio_ap_mdev_ioctl(struct mdev_device *mdev, return ret; } +static const struct vfio_mdev_device_ops vfio_mdev_ops = { + .open = vfio_ap_mdev_open, + .release = vfio_ap_mdev_release, + .ioctl = vfio_ap_mdev_ioctl, +}; + static const struct mdev_parent_ops vfio_ap_matrix_ops = { .owner = THIS_MODULE, .supported_type_groups = vfio_ap_mdev_type_groups, .mdev_attr_groups = vfio_ap_mdev_attr_groups, .create = vfio_ap_mdev_create, .remove = vfio_ap_mdev_remove, - .open = vfio_ap_mdev_open, - .release = vfio_ap_mdev_release, - .ioctl = vfio_ap_mdev_ioctl, }; int vfio_ap_mdev_register(void) diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c index 3a9c52d71b4e..555bd61d8c38 100644 --- a/drivers/vfio/mdev/mdev_core.c +++ b/drivers/vfio/mdev/mdev_core.c @@ -45,9 +45,10 @@ void mdev_set_drvdata(struct mdev_device *mdev, void *data) } EXPORT_SYMBOL(mdev_set_drvdata); + /* Specify the class for the mdev device, this must be called during - * create() callback. - */ + * create() callback explicitly or implicity through the helpers + * provided by each class. */ void mdev_set_class(struct mdev_device *mdev, u16 id) { WARN_ON(mdev->class_id); @@ -55,6 +56,26 @@ void mdev_set_class(struct mdev_device *mdev, u16 id) } EXPORT_SYMBOL(mdev_set_class); +/* Specify the mdev device to be a VFIO mdev device, and set VFIO + * device ops for it. This must be called from the create() callback + * for VFIO mdev device. + */ +void mdev_set_vfio_ops(struct mdev_device *mdev, + const struct vfio_mdev_device_ops *vfio_ops) +{ + mdev_set_class(mdev, MDEV_CLASS_ID_VFIO); + mdev->vfio_ops = vfio_ops; +} +EXPORT_SYMBOL(mdev_set_vfio_ops); + +/* Get the VFIO device ops for the mdev device. */ +const struct vfio_mdev_device_ops *mdev_get_vfio_ops(struct mdev_device *mdev) +{ + WARN_ON(mdev->class_id != MDEV_CLASS_ID_VFIO); + return mdev->vfio_ops; +} +EXPORT_SYMBOL(mdev_get_vfio_ops); + struct device *mdev_dev(struct mdev_device *mdev) { return &mdev->dev; diff --git a/drivers/vfio/mdev/mdev_private.h b/drivers/vfio/mdev/mdev_private.h index c65f436c1869..0770410ded2a 100644 --- a/drivers/vfio/mdev/mdev_private.h +++ b/drivers/vfio/mdev/mdev_private.h @@ -10,6 +10,8 @@ #ifndef MDEV_PRIVATE_H #define MDEV_PRIVATE_H +#include + int mdev_bus_register(void); void mdev_bus_unregister(void); @@ -34,6 +36,9 @@ struct mdev_device { struct device *iommu_device; bool active; u16 class_id; + union { + const struct vfio_mdev_device_ops *vfio_ops; + }; }; #define to_mdev_device(dev) container_of(dev, struct mdev_device, dev) diff --git a/drivers/vfio/mdev/vfio_mdev.c b/drivers/vfio/mdev/vfio_mdev.c index cb701cd646f0..d5ede5f0544e 100644 --- a/drivers/vfio/mdev/vfio_mdev.c +++ b/drivers/vfio/mdev/vfio_mdev.c @@ -14,6 +14,7 @@ #include #include #include +#include #include "mdev_private.h" @@ -24,16 +25,16 @@ static int vfio_mdev_open(void *device_data) { struct mdev_device *mdev = device_data; - struct mdev_parent *parent = mdev->parent; + const struct vfio_mdev_device_ops *ops = mdev_get_vfio_ops(mdev); int ret; - if (unlikely(!parent->ops->open)) + if (unlikely(!ops->open)) return -EINVAL; if (!try_module_get(THIS_MODULE)) return -ENODEV; - ret = parent->ops->open(mdev); + ret = ops->open(mdev); if (ret) module_put(THIS_MODULE); @@ -43,10 +44,10 @@ static int vfio_mdev_open(void *device_data) static void vfio_mdev_release(void *device_data) { struct mdev_device *mdev = device_data; - struct mdev_parent *parent = mdev->parent; + const struct vfio_mdev_device_ops *ops = mdev_get_vfio_ops(mdev); - if (likely(parent->ops->release)) - parent->ops->release(mdev); + if (likely(ops->release)) + ops->release(mdev); module_put(THIS_MODULE); } @@ -55,47 +56,47 @@ static long vfio_mdev_unlocked_ioctl(void *device_data, unsigned int cmd, unsigned long arg) { struct mdev_device *mdev = device_data; - struct mdev_parent *parent = mdev->parent; + const struct vfio_mdev_device_ops *ops = mdev_get_vfio_ops(mdev); - if (unlikely(!parent->ops->ioctl)) + if (unlikely(!ops->ioctl)) return -EINVAL; - return parent->ops->ioctl(mdev, cmd, arg); + return ops->ioctl(mdev, cmd, arg); } static ssize_t vfio_mdev_read(void *device_data, char __user *buf, size_t count, loff_t *ppos) { struct mdev_device *mdev = device_data; - struct mdev_parent *parent = mdev->parent; + const struct vfio_mdev_device_ops *ops = mdev_get_vfio_ops(mdev); - if (unlikely(!parent->ops->read)) + if (unlikely(!ops->read)) return -EINVAL; - return parent->ops->read(mdev, buf, count, ppos); + return ops->read(mdev, buf, count, ppos); } static ssize_t vfio_mdev_write(void *device_data, const char __user *buf, size_t count, loff_t *ppos) { struct mdev_device *mdev = device_data; - struct mdev_parent *parent = mdev->parent; + const struct vfio_mdev_device_ops *ops = mdev_get_vfio_ops(mdev); - if (unlikely(!parent->ops->write)) + if (unlikely(!ops->write)) return -EINVAL; - return parent->ops->write(mdev, buf, count, ppos); + return ops->write(mdev, buf, count, ppos); } static int vfio_mdev_mmap(void *device_data, struct vm_area_struct *vma) { struct mdev_device *mdev = device_data; - struct mdev_parent *parent = mdev->parent; + const struct vfio_mdev_device_ops *ops = mdev_get_vfio_ops(mdev); - if (unlikely(!parent->ops->mmap)) + if (unlikely(!ops->mmap)) return -EINVAL; - return parent->ops->mmap(mdev, vma); + return ops->mmap(mdev, vma); } static const struct vfio_device_ops vfio_mdev_dev_ops = { diff --git a/include/linux/mdev.h b/include/linux/mdev.h index 78b69d09eb54..4625f1a11014 100644 --- a/include/linux/mdev.h +++ b/include/linux/mdev.h @@ -10,7 +10,13 @@ #ifndef MDEV_H #define MDEV_H +#include +#include +#include +#include + struct mdev_device; +struct vfio_mdev_device_ops; /* * Called by the parent device driver to set the device which represents @@ -48,30 +54,7 @@ struct device *mdev_get_iommu_device(struct device *dev); * @mdev: mdev_device device structure which is being * destroyed * Returns integer: success (0) or error (< 0) - * @open: Open mediated device. - * @mdev: mediated device. - * Returns integer: success (0) or error (< 0) - * @release: release mediated device - * @mdev: mediated device. - * @read: Read emulation callback - * @mdev: mediated device structure - * @buf: read buffer - * @count: number of bytes to read - * @ppos: address. - * Retuns number on bytes read on success or error. - * @write: Write emulation callback - * @mdev: mediated device structure - * @buf: write buffer - * @count: number of bytes to be written - * @ppos: address. - * Retuns number on bytes written on success or error. - * @ioctl: IOCTL callback - * @mdev: mediated device structure - * @cmd: ioctl command - * @arg: arguments to ioctl - * @mmap: mmap callback - * @mdev: mediated device structure - * @vma: vma structure + * * Parent device that support mediated device should be registered with mdev * module with mdev_parent_ops structure. **/ @@ -83,15 +66,6 @@ struct mdev_parent_ops { int (*create)(struct kobject *kobj, struct mdev_device *mdev); int (*remove)(struct mdev_device *mdev); - int (*open)(struct mdev_device *mdev); - void (*release)(struct mdev_device *mdev); - ssize_t (*read)(struct mdev_device *mdev, char __user *buf, - size_t count, loff_t *ppos); - ssize_t (*write)(struct mdev_device *mdev, const char __user *buf, - size_t count, loff_t *ppos); - long (*ioctl)(struct mdev_device *mdev, unsigned int cmd, - unsigned long arg); - int (*mmap)(struct mdev_device *mdev, struct vm_area_struct *vma); }; /* interface for exporting mdev supported type attributes */ @@ -135,6 +109,9 @@ void *mdev_get_drvdata(struct mdev_device *mdev); void mdev_set_drvdata(struct mdev_device *mdev, void *data); const guid_t *mdev_uuid(struct mdev_device *mdev); void mdev_set_class(struct mdev_device *mdev, u16 id); +void mdev_set_vfio_ops(struct mdev_device *mdev, + const struct vfio_mdev_device_ops *vfio_ops); +const struct vfio_mdev_device_ops *mdev_get_vfio_ops(struct mdev_device *mdev); extern struct bus_type mdev_bus_type; diff --git a/include/linux/vfio_mdev_ops.h b/include/linux/vfio_mdev_ops.h new file mode 100644 index 000000000000..3907c5371c2b --- /dev/null +++ b/include/linux/vfio_mdev_ops.h @@ -0,0 +1,52 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * VFIO Mediated device definition + */ + +#ifndef VFIO_MDEV_H +#define VFIO_MDEV_H + +#include + +/** + * struct vfio_mdev_device_ops - Structure to be registered for each + * mdev device to register the device to vfio-mdev module. + * + * @open: Open mediated device. + * @mdev: mediated device. + * Returns integer: success (0) or error (< 0) + * @release: release mediated device + * @mdev: mediated device. + * @read: Read emulation callback + * @mdev: mediated device structure + * @buf: read buffer + * @count: number of bytes to read + * @ppos: address. + * Retuns number on bytes read on success or error. + * @write: Write emulation callback + * @mdev: mediated device structure + * @buf: write buffer + * @count: number of bytes to be written + * @ppos: address. + * Retuns number on bytes written on success or error. + * @ioctl: IOCTL callback + * @mdev: mediated device structure + * @cmd: ioctl command + * @arg: arguments to ioctl + * @mmap: mmap callback + * @mdev: mediated device structure + * @vma: vma structure + */ +struct vfio_mdev_device_ops { + int (*open)(struct mdev_device *mdev); + void (*release)(struct mdev_device *mdev); + ssize_t (*read)(struct mdev_device *mdev, char __user *buf, + size_t count, loff_t *ppos); + ssize_t (*write)(struct mdev_device *mdev, const char __user *buf, + size_t count, loff_t *ppos); + long (*ioctl)(struct mdev_device *mdev, unsigned int cmd, + unsigned long arg); + int (*mmap)(struct mdev_device *mdev, struct vm_area_struct *vma); +}; + +#endif diff --git a/samples/vfio-mdev/mbochs.c b/samples/vfio-mdev/mbochs.c index 115bc5074656..1afec20bf0c5 100644 --- a/samples/vfio-mdev/mbochs.c +++ b/samples/vfio-mdev/mbochs.c @@ -30,6 +30,7 @@ #include #include #include +#include #include #include #include @@ -516,6 +517,8 @@ static int mbochs_reset(struct mdev_device *mdev) return 0; } +static const struct vfio_mdev_device_ops vfio_mdev_ops; + static int mbochs_create(struct kobject *kobj, struct mdev_device *mdev) { const struct mbochs_type *type = mbochs_find_type(kobj); @@ -561,7 +564,7 @@ static int mbochs_create(struct kobject *kobj, struct mdev_device *mdev) mbochs_reset(mdev); mbochs_used_mbytes += type->mbytes; - mdev_set_class(mdev, MDEV_CLASS_ID_VFIO); + mdev_set_vfio_ops(mdev, &vfio_mdev_ops); return 0; err_mem: @@ -1419,12 +1422,7 @@ static struct attribute_group *mdev_type_groups[] = { NULL, }; -static const struct mdev_parent_ops mdev_fops = { - .owner = THIS_MODULE, - .mdev_attr_groups = mdev_dev_groups, - .supported_type_groups = mdev_type_groups, - .create = mbochs_create, - .remove = mbochs_remove, +static const struct vfio_mdev_device_ops vfio_mdev_ops = { .open = mbochs_open, .release = mbochs_close, .read = mbochs_read, @@ -1433,6 +1431,14 @@ static const struct mdev_parent_ops mdev_fops = { .mmap = mbochs_mmap, }; +static const struct mdev_parent_ops mdev_fops = { + .owner = THIS_MODULE, + .mdev_attr_groups = mdev_dev_groups, + .supported_type_groups = mdev_type_groups, + .create = mbochs_create, + .remove = mbochs_remove, +}; + static const struct file_operations vd_fops = { .owner = THIS_MODULE, }; diff --git a/samples/vfio-mdev/mdpy.c b/samples/vfio-mdev/mdpy.c index 665614574d50..d571fb65f50f 100644 --- a/samples/vfio-mdev/mdpy.c +++ b/samples/vfio-mdev/mdpy.c @@ -26,6 +26,7 @@ #include #include #include +#include #include #include #include "mdpy-defs.h" @@ -226,6 +227,8 @@ static int mdpy_reset(struct mdev_device *mdev) return 0; } +static const struct vfio_mdev_device_ops vfio_mdev_ops; + static int mdpy_create(struct kobject *kobj, struct mdev_device *mdev) { const struct mdpy_type *type = mdpy_find_type(kobj); @@ -269,7 +272,7 @@ static int mdpy_create(struct kobject *kobj, struct mdev_device *mdev) mdpy_reset(mdev); mdpy_count++; - mdev_set_class(mdev, MDEV_CLASS_ID_VFIO); + mdev_set_vfio_ops(mdev, &vfio_mdev_ops); return 0; } @@ -726,12 +729,7 @@ static struct attribute_group *mdev_type_groups[] = { NULL, }; -static const struct mdev_parent_ops mdev_fops = { - .owner = THIS_MODULE, - .mdev_attr_groups = mdev_dev_groups, - .supported_type_groups = mdev_type_groups, - .create = mdpy_create, - .remove = mdpy_remove, +static const struct vfio_mdev_device_ops vfio_mdev_ops = { .open = mdpy_open, .release = mdpy_close, .read = mdpy_read, @@ -740,6 +738,14 @@ static const struct mdev_parent_ops mdev_fops = { .mmap = mdpy_mmap, }; +static const struct mdev_parent_ops mdev_fops = { + .owner = THIS_MODULE, + .mdev_attr_groups = mdev_dev_groups, + .supported_type_groups = mdev_type_groups, + .create = mdpy_create, + .remove = mdpy_remove, +}; + static const struct file_operations vd_fops = { .owner = THIS_MODULE, }; diff --git a/samples/vfio-mdev/mtty.c b/samples/vfio-mdev/mtty.c index 90da12ff7fd9..4048b242c636 100644 --- a/samples/vfio-mdev/mtty.c +++ b/samples/vfio-mdev/mtty.c @@ -27,6 +27,7 @@ #include #include #include +#include #include #include #include @@ -708,6 +709,8 @@ static ssize_t mdev_access(struct mdev_device *mdev, u8 *buf, size_t count, return ret; } +static const struct vfio_mdev_device_ops vfio_dev_ops; + static int mtty_create(struct kobject *kobj, struct mdev_device *mdev) { struct mdev_state *mdev_state; @@ -755,7 +758,7 @@ static int mtty_create(struct kobject *kobj, struct mdev_device *mdev) list_add(&mdev_state->next, &mdev_devices_list); mutex_unlock(&mdev_list_lock); - mdev_set_class(mdev, MDEV_CLASS_ID_VFIO); + mdev_set_vfio_ops(mdev, &vfio_dev_ops); return 0; } @@ -1388,6 +1391,14 @@ static struct attribute_group *mdev_type_groups[] = { NULL, }; +static const struct vfio_mdev_device_ops vfio_dev_ops = { + .open = mtty_open, + .release = mtty_close, + .read = mtty_read, + .write = mtty_write, + .ioctl = mtty_ioctl, +}; + static const struct mdev_parent_ops mdev_fops = { .owner = THIS_MODULE, .dev_attr_groups = mtty_dev_groups, @@ -1395,11 +1406,6 @@ static const struct mdev_parent_ops mdev_fops = { .supported_type_groups = mdev_type_groups, .create = mtty_create, .remove = mtty_remove, - .open = mtty_open, - .release = mtty_close, - .read = mtty_read, - .write = mtty_write, - .ioctl = mtty_ioctl, }; static void mtty_device_release(struct device *dev) From patchwork Wed Oct 23 13:07:50 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jason Wang X-Patchwork-Id: 11206827 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 E60F9112B for ; Wed, 23 Oct 2019 13:23:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B134221925 for ; Wed, 23 Oct 2019 13:23:39 +0000 (UTC) Authentication-Results: mail.kernel.org; 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Wed, 23 Oct 2019 09:23:32 -0400 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 26DE4800D59; Wed, 23 Oct 2019 13:23:28 +0000 (UTC) Received: from jason-ThinkPad-X1-Carbon-6th.redhat.com (ovpn-12-126.pek2.redhat.com [10.72.12.126]) by smtp.corp.redhat.com (Postfix) with ESMTP id 30BD8600CC; Wed, 23 Oct 2019 13:20:18 +0000 (UTC) From: Jason Wang To: kvm@vger.kernel.org, linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, intel-gvt-dev@lists.freedesktop.org, kwankhede@nvidia.com, alex.williamson@redhat.com, mst@redhat.com, tiwei.bie@intel.com Cc: virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, cohuck@redhat.com, maxime.coquelin@redhat.com, cunming.liang@intel.com, zhihong.wang@intel.com, rob.miller@broadcom.com, xiao.w.wang@intel.com, haotian.wang@sifive.com, zhenyuw@linux.intel.com, zhi.a.wang@intel.com, jani.nikula@linux.intel.com, joonas.lahtinen@linux.intel.com, rodrigo.vivi@intel.com, airlied@linux.ie, daniel@ffwll.ch, farman@linux.ibm.com, pasic@linux.ibm.com, sebott@linux.ibm.com, oberpar@linux.ibm.com, heiko.carstens@de.ibm.com, gor@linux.ibm.com, borntraeger@de.ibm.com, akrowiak@linux.ibm.com, freude@linux.ibm.com, lingshan.zhu@intel.com, idos@mellanox.com, eperezma@redhat.com, lulu@redhat.com, parav@mellanox.com, christophe.de.dinechin@gmail.com, kevin.tian@intel.com, stefanha@redhat.com, Jason Wang Subject: [PATCH V5 4/6] mdev: introduce virtio device and its device ops Date: Wed, 23 Oct 2019 21:07:50 +0800 Message-Id: <20191023130752.18980-5-jasowang@redhat.com> In-Reply-To: <20191023130752.18980-1-jasowang@redhat.com> References: <20191023130752.18980-1-jasowang@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-MC-Unique: SjDw5hsHPSuhoHLQQPtesw-1 X-Mimecast-Spam-Score: 0 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org This patch implements basic support for mdev driver that supports virtio transport for kernel virtio driver. Signed-off-by: Jason Wang --- drivers/vfio/mdev/mdev_core.c | 20 ++++ drivers/vfio/mdev/mdev_private.h | 2 + include/linux/mdev.h | 6 ++ include/linux/virtio_mdev_ops.h | 159 +++++++++++++++++++++++++++++++ 4 files changed, 187 insertions(+) create mode 100644 include/linux/virtio_mdev_ops.h diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c index 555bd61d8c38..9b00c3513120 100644 --- a/drivers/vfio/mdev/mdev_core.c +++ b/drivers/vfio/mdev/mdev_core.c @@ -76,6 +76,26 @@ const struct vfio_mdev_device_ops *mdev_get_vfio_ops(struct mdev_device *mdev) } EXPORT_SYMBOL(mdev_get_vfio_ops); +/* Specify the virtio device ops for the mdev device, this + * must be called during create() callback for virtio mdev device. + */ +void mdev_set_virtio_ops(struct mdev_device *mdev, + const struct virtio_mdev_device_ops *virtio_ops) +{ + mdev_set_class(mdev, MDEV_CLASS_ID_VIRTIO); + mdev->virtio_ops = virtio_ops; +} +EXPORT_SYMBOL(mdev_set_virtio_ops); + +/* Get the virtio device ops for the mdev device. */ +const struct virtio_mdev_device_ops * +mdev_get_virtio_ops(struct mdev_device *mdev) +{ + WARN_ON(mdev->class_id != MDEV_CLASS_ID_VIRTIO); + return mdev->virtio_ops; +} +EXPORT_SYMBOL(mdev_get_virtio_ops); + struct device *mdev_dev(struct mdev_device *mdev) { return &mdev->dev; diff --git a/drivers/vfio/mdev/mdev_private.h b/drivers/vfio/mdev/mdev_private.h index 0770410ded2a..7b47890c34e7 100644 --- a/drivers/vfio/mdev/mdev_private.h +++ b/drivers/vfio/mdev/mdev_private.h @@ -11,6 +11,7 @@ #define MDEV_PRIVATE_H #include +#include int mdev_bus_register(void); void mdev_bus_unregister(void); @@ -38,6 +39,7 @@ struct mdev_device { u16 class_id; union { const struct vfio_mdev_device_ops *vfio_ops; + const struct virtio_mdev_device_ops *virtio_ops; }; }; diff --git a/include/linux/mdev.h b/include/linux/mdev.h index 4625f1a11014..9b69b0bbebfd 100644 --- a/include/linux/mdev.h +++ b/include/linux/mdev.h @@ -17,6 +17,7 @@ struct mdev_device; struct vfio_mdev_device_ops; +struct virtio_mdev_device_ops; /* * Called by the parent device driver to set the device which represents @@ -112,6 +113,10 @@ void mdev_set_class(struct mdev_device *mdev, u16 id); void mdev_set_vfio_ops(struct mdev_device *mdev, const struct vfio_mdev_device_ops *vfio_ops); const struct vfio_mdev_device_ops *mdev_get_vfio_ops(struct mdev_device *mdev); +void mdev_set_virtio_ops(struct mdev_device *mdev, + const struct virtio_mdev_device_ops *virtio_ops); +const struct virtio_mdev_device_ops * +mdev_get_virtio_ops(struct mdev_device *mdev); extern struct bus_type mdev_bus_type; @@ -127,6 +132,7 @@ struct mdev_device *mdev_from_dev(struct device *dev); enum { MDEV_CLASS_ID_VFIO = 1, + MDEV_CLASS_ID_VIRTIO = 2, /* New entries must be added here */ }; diff --git a/include/linux/virtio_mdev_ops.h b/include/linux/virtio_mdev_ops.h new file mode 100644 index 000000000000..d417b41f2845 --- /dev/null +++ b/include/linux/virtio_mdev_ops.h @@ -0,0 +1,159 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Virtio mediated device driver + * + * Copyright 2019, Red Hat Corp. + * Author: Jason Wang + */ +#ifndef _LINUX_VIRTIO_MDEV_H +#define _LINUX_VIRTIO_MDEV_H + +#include +#include +#include + +#define VIRTIO_MDEV_DEVICE_API_STRING "virtio-mdev" +#define VIRTIO_MDEV_F_VERSION_1 0x1 + +struct virtio_mdev_callback { + irqreturn_t (*callback)(void *data); + void *private; +}; + +/** + * struct vfio_mdev_device_ops - Structure to be registered for each + * mdev device to register the device for virtio/vhost drivers. + * + * The device ops that is supported by VIRTIO_MDEV_F_VERSION_1, the + * callbacks are mandatory unless explicity mentioned. + * + * @set_vq_address: Set the address of virtqueue + * @mdev: mediated device + * @idx: virtqueue index + * @desc_area: address of desc area + * @driver_area: address of driver area + * @device_area: address of device area + * Returns integer: success (0) or error (< 0) + * @set_vq_num: Set the size of virtqueue + * @mdev: mediated device + * @idx: virtqueue index + * @num: the size of virtqueue + * @kick_vq: Kick the virtqueue + * @mdev: mediated device + * @idx: virtqueue index + * @set_vq_cb: Set the interrupt callback function for + * a virtqueue + * @mdev: mediated device + * @idx: virtqueue index + * @cb: virtio-mdev interrupt callback structure + * @set_vq_ready: Set ready status for a virtqueue + * @mdev: mediated device + * @idx: virtqueue index + * @ready: ready (true) not ready(false) + * @get_vq_ready: Get ready status for a virtqueue + * @mdev: mediated device + * @idx: virtqueue index + * Returns boolean: ready (true) or not (false) + * @set_vq_state: Set the state for a virtqueue + * @mdev: mediated device + * @idx: virtqueue index + * @state: virtqueue state (last_avail_idx) + * Returns integer: success (0) or error (< 0) + * @get_vq_state: Get the state for a virtqueue + * @mdev: mediated device + * @idx: virtqueue index + * Returns virtqueue state (last_avail_idx) + * @get_vq_align: Get the virtqueue align requirement + * for the device + * @mdev: mediated device + * Returns virtqueue algin requirement + * @get_features: Get virtio features supported by the device + * @mdev: mediated device + * Returns the virtio features support by the + * device + * @get_features: Set virtio features supported by the driver + * @mdev: mediated device + * @features: feature support by the driver + * Returns integer: success (0) or error (< 0) + * @set_config_cb: Set the config interrupt callback + * @mdev: mediated device + * @cb: virtio-mdev interrupt callback structure + * @get_vq_num_max: Get the max size of virtqueue + * @mdev: mediated device + * Returns u16: max size of virtqueue + * @get_device_id: Get virtio device id + * @mdev: mediated device + * Returns u32: virtio device id + * @get_vendor_id: Get id for the vendor that provides this device + * @mdev: mediated device + * Returns u32: virtio vendor id + * @get_status: Get the device status + * @mdev: mediated device + * Returns u8: virtio device status + * @set_status: Set the device status + * @mdev: mediated device + * @status: virtio device status + * @get_config: Read from device specific configuration space + * @mdev: mediated device + * @offset: offset from the beginning of + * configuration space + * @buf: buffer used to read to + * @len: the length to read from + * configration space + * @set_config: Write to device specific configuration space + * @mdev: mediated device + * @offset: offset from the beginning of + * configuration space + * @buf: buffer used to write from + * @len: the length to write to + * configration space + * @get_mdev_features: Get a set of bits that demonstrate + * thecapability of the mdev device. New + * features bits must be added when + * introducing new device ops. + * @mdev: mediated device + * Returns the mdev features (API) support by + * the device. + * @get_generation: Get device config generaton (optionally) + * @mdev: mediated device + * Returns u32: device generation + */ +struct virtio_mdev_device_ops { + /* Virtqueue ops */ + int (*set_vq_address)(struct mdev_device *mdev, + u16 idx, u64 desc_area, u64 driver_area, + u64 device_area); + void (*set_vq_num)(struct mdev_device *mdev, u16 idx, u32 num); + void (*kick_vq)(struct mdev_device *mdev, u16 idx); + void (*set_vq_cb)(struct mdev_device *mdev, u16 idx, + struct virtio_mdev_callback *cb); + void (*set_vq_ready)(struct mdev_device *mdev, u16 idx, bool ready); + bool (*get_vq_ready)(struct mdev_device *mdev, u16 idx); + int (*set_vq_state)(struct mdev_device *mdev, u16 idx, u64 state); + u64 (*get_vq_state)(struct mdev_device *mdev, u16 idx); + + /* Virtio device ops */ + u16 (*get_vq_align)(struct mdev_device *mdev); + u64 (*get_features)(struct mdev_device *mdev); + int (*set_features)(struct mdev_device *mdev, u64 features); + void (*set_config_cb)(struct mdev_device *mdev, + struct virtio_mdev_callback *cb); + u16 (*get_vq_num_max)(struct mdev_device *mdev); + u32 (*get_device_id)(struct mdev_device *mdev); + u32 (*get_vendor_id)(struct mdev_device *mdev); + u8 (*get_status)(struct mdev_device *mdev); + void (*set_status)(struct mdev_device *mdev, u8 status); + void (*get_config)(struct mdev_device *mdev, unsigned int offset, + void *buf, unsigned int len); + void (*set_config)(struct mdev_device *mdev, unsigned int offset, + const void *buf, unsigned int len); + u32 (*get_generation)(struct mdev_device *mdev); + + /* Mdev device ops */ + u64 (*get_mdev_features)(struct mdev_device *mdev); +}; + +void mdev_set_virtio_ops(struct mdev_device *mdev, + const struct virtio_mdev_device_ops *virtio_ops); + +#endif From patchwork Wed Oct 23 13:07:51 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jason Wang X-Patchwork-Id: 11206829 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 B6B371747 for ; Wed, 23 Oct 2019 13:25:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 786C221928 for ; Wed, 23 Oct 2019 13:25:41 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="f5eCbCIi" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389590AbfJWNZk (ORCPT ); Wed, 23 Oct 2019 09:25:40 -0400 Received: from us-smtp-delivery-1.mimecast.com ([207.211.31.120]:32456 "EHLO us-smtp-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S2405859AbfJWNZk (ORCPT ); Wed, 23 Oct 2019 09:25:40 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1571837138; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=aCX3HRqM2gF1Momqf/VdInXEsm+G0x9On2AZGQWmCoc=; b=f5eCbCIi3H+pNDU7Mq0u9vVHXi9h2kkLUzfomBqPIFPhC65A0ubNRo9QxPDgMFTTIth3Bd eNV55EOvBjwEfCJiWFoqVgMW8SLqQasmTXtQz7F8CVeIrK6mVyx/QuZOid27Ks+slLT7MF QpPB1Rznmlco+MKPVfegRczxbBZwsUo= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-245-Dyv3XFIFMNyzKYl-olh4-Q-1; Wed, 23 Oct 2019 09:25:35 -0400 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 5B176100551D; Wed, 23 Oct 2019 13:25:31 +0000 (UTC) Received: from jason-ThinkPad-X1-Carbon-6th.redhat.com (ovpn-12-126.pek2.redhat.com [10.72.12.126]) by smtp.corp.redhat.com (Postfix) with ESMTP id 474626012E; Wed, 23 Oct 2019 13:23:32 +0000 (UTC) From: Jason Wang To: kvm@vger.kernel.org, linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, intel-gvt-dev@lists.freedesktop.org, kwankhede@nvidia.com, alex.williamson@redhat.com, mst@redhat.com, tiwei.bie@intel.com Cc: virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, cohuck@redhat.com, maxime.coquelin@redhat.com, cunming.liang@intel.com, zhihong.wang@intel.com, rob.miller@broadcom.com, xiao.w.wang@intel.com, haotian.wang@sifive.com, zhenyuw@linux.intel.com, zhi.a.wang@intel.com, jani.nikula@linux.intel.com, joonas.lahtinen@linux.intel.com, rodrigo.vivi@intel.com, airlied@linux.ie, daniel@ffwll.ch, farman@linux.ibm.com, pasic@linux.ibm.com, sebott@linux.ibm.com, oberpar@linux.ibm.com, heiko.carstens@de.ibm.com, gor@linux.ibm.com, borntraeger@de.ibm.com, akrowiak@linux.ibm.com, freude@linux.ibm.com, lingshan.zhu@intel.com, idos@mellanox.com, eperezma@redhat.com, lulu@redhat.com, parav@mellanox.com, christophe.de.dinechin@gmail.com, kevin.tian@intel.com, stefanha@redhat.com, Jason Wang Subject: [PATCH V5 5/6] virtio: introduce a mdev based transport Date: Wed, 23 Oct 2019 21:07:51 +0800 Message-Id: <20191023130752.18980-6-jasowang@redhat.com> In-Reply-To: <20191023130752.18980-1-jasowang@redhat.com> References: <20191023130752.18980-1-jasowang@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-MC-Unique: Dyv3XFIFMNyzKYl-olh4-Q-1 X-Mimecast-Spam-Score: 0 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org This patch introduces a new mdev transport for virtio. This is used to use kernel virtio driver to drive the mediated device that is capable of populating virtqueue directly. A new virtio-mdev driver will be registered to the mdev bus, when a new virtio-mdev device is probed, it will register the device with mdev based config ops. This means it is a software transport between mdev driver and mdev device. The transport was implemented through device specific ops which is a part of mdev_parent_ops now. Signed-off-by: Jason Wang --- drivers/virtio/Kconfig | 7 + drivers/virtio/Makefile | 1 + drivers/virtio/virtio_mdev.c | 413 +++++++++++++++++++++++++++++++++++ 3 files changed, 421 insertions(+) create mode 100644 drivers/virtio/virtio_mdev.c diff --git a/drivers/virtio/Kconfig b/drivers/virtio/Kconfig index 078615cf2afc..8d18722ab572 100644 --- a/drivers/virtio/Kconfig +++ b/drivers/virtio/Kconfig @@ -43,6 +43,13 @@ config VIRTIO_PCI_LEGACY If unsure, say Y. +config VIRTIO_MDEV_DEVICE + tristate "VIRTIO driver for Mediated devices" + depends on VFIO_MDEV && VIRTIO + default n + help + VIRTIO based driver for Mediated devices. + config VIRTIO_PMEM tristate "Support for virtio pmem driver" depends on VIRTIO diff --git a/drivers/virtio/Makefile b/drivers/virtio/Makefile index 3a2b5c5dcf46..ebc7fa15ae82 100644 --- a/drivers/virtio/Makefile +++ b/drivers/virtio/Makefile @@ -6,3 +6,4 @@ virtio_pci-y := virtio_pci_modern.o virtio_pci_common.o virtio_pci-$(CONFIG_VIRTIO_PCI_LEGACY) += virtio_pci_legacy.o obj-$(CONFIG_VIRTIO_BALLOON) += virtio_balloon.o obj-$(CONFIG_VIRTIO_INPUT) += virtio_input.o +obj-$(CONFIG_VIRTIO_MDEV_DEVICE) += virtio_mdev.o diff --git a/drivers/virtio/virtio_mdev.c b/drivers/virtio/virtio_mdev.c new file mode 100644 index 000000000000..eb2621f9182c --- /dev/null +++ b/drivers/virtio/virtio_mdev.c @@ -0,0 +1,413 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * VIRTIO based driver for Mediated device + * + * Copyright (c) 2019, Red Hat. All rights reserved. + * Author: Jason Wang + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define DRIVER_VERSION "0.1" +#define DRIVER_AUTHOR "Red Hat Corporation" +#define DRIVER_DESC "VIRTIO based driver for Mediated device" + +#define to_virtio_mdev_device(dev) \ + container_of(dev, struct virtio_mdev_device, vdev) + +struct virtio_mdev_device { + struct virtio_device vdev; + struct mdev_device *mdev; + u64 features; + + /* The lock to protect virtqueue list */ + spinlock_t lock; + /* List of virtio_mdev_vq_info */ + struct list_head virtqueues; +}; + +struct virtio_mdev_vq_info { + /* the actual virtqueue */ + struct virtqueue *vq; + + /* the list node for the virtqueues list */ + struct list_head node; +}; + +static struct mdev_device *vm_get_mdev(struct virtio_device *vdev) +{ + struct virtio_mdev_device *vm_dev = to_virtio_mdev_device(vdev); + struct mdev_device *mdev = vm_dev->mdev; + + return mdev; +} + +static void virtio_mdev_get(struct virtio_device *vdev, unsigned offset, + void *buf, unsigned len) +{ + struct mdev_device *mdev = vm_get_mdev(vdev); + const struct virtio_mdev_device_ops *ops = mdev_get_virtio_ops(mdev); + + ops->get_config(mdev, offset, buf, len); +} + +static void virtio_mdev_set(struct virtio_device *vdev, unsigned offset, + const void *buf, unsigned len) +{ + struct mdev_device *mdev = vm_get_mdev(vdev); + const struct virtio_mdev_device_ops *ops = mdev_get_virtio_ops(mdev); + + ops->set_config(mdev, offset, buf, len); +} + +static u32 virtio_mdev_generation(struct virtio_device *vdev) +{ + struct mdev_device *mdev = vm_get_mdev(vdev); + const struct virtio_mdev_device_ops *ops = mdev_get_virtio_ops(mdev); + + if (ops->get_generation) + return ops->get_generation(mdev); + + return 0; +} + +static u8 virtio_mdev_get_status(struct virtio_device *vdev) +{ + struct mdev_device *mdev = vm_get_mdev(vdev); + const struct virtio_mdev_device_ops *ops = mdev_get_virtio_ops(mdev); + + return ops->get_status(mdev); +} + +static void virtio_mdev_set_status(struct virtio_device *vdev, u8 status) +{ + struct mdev_device *mdev = vm_get_mdev(vdev); + const struct virtio_mdev_device_ops *ops = mdev_get_virtio_ops(mdev); + + return ops->set_status(mdev, status); +} + +static void virtio_mdev_reset(struct virtio_device *vdev) +{ + struct mdev_device *mdev = vm_get_mdev(vdev); + const struct virtio_mdev_device_ops *ops = mdev_get_virtio_ops(mdev); + + return ops->set_status(mdev, 0); +} + +static bool virtio_mdev_notify(struct virtqueue *vq) +{ + struct mdev_device *mdev = vm_get_mdev(vq->vdev); + const struct virtio_mdev_device_ops *ops = mdev_get_virtio_ops(mdev); + + ops->kick_vq(mdev, vq->index); + + return true; +} + +static irqreturn_t virtio_mdev_config_cb(void *private) +{ + struct virtio_mdev_device *vm_dev = private; + + virtio_config_changed(&vm_dev->vdev); + + return IRQ_HANDLED; +} + +static irqreturn_t virtio_mdev_virtqueue_cb(void *private) +{ + struct virtio_mdev_vq_info *info = private; + + return vring_interrupt(0, info->vq); +} + +static struct virtqueue * +virtio_mdev_setup_vq(struct virtio_device *vdev, unsigned index, + void (*callback)(struct virtqueue *vq), + const char *name, bool ctx) +{ + struct virtio_mdev_device *vm_dev = to_virtio_mdev_device(vdev); + struct mdev_device *mdev = vm_get_mdev(vdev); + const struct virtio_mdev_device_ops *ops = mdev_get_virtio_ops(mdev); + struct virtio_mdev_vq_info *info; + struct virtio_mdev_callback cb; + struct virtqueue *vq; + u64 desc_addr, driver_addr, device_addr; + unsigned long flags; + u32 align, num; + int err; + + if (!name) + return NULL; + + /* Queue shouldn't already be set up. */ + if (ops->get_vq_ready(mdev, index)) + return ERR_PTR(-ENOENT); + + /* Allocate and fill out our active queue description */ + info = kmalloc(sizeof(*info), GFP_KERNEL); + if (!info) + return ERR_PTR(-ENOMEM); + + num = ops->get_vq_num_max(mdev); + if (num == 0) { + err = -ENOENT; + goto error_new_virtqueue; + } + + /* Create the vring */ + align = ops->get_vq_align(mdev); + vq = vring_create_virtqueue(index, num, align, vdev, + true, true, ctx, + virtio_mdev_notify, callback, name); + if (!vq) { + err = -ENOMEM; + goto error_new_virtqueue; + } + + /* Setup virtqueue callback */ + cb.callback = virtio_mdev_virtqueue_cb; + cb.private = info; + ops->set_vq_cb(mdev, index, &cb); + ops->set_vq_num(mdev, index, virtqueue_get_vring_size(vq)); + + desc_addr = virtqueue_get_desc_addr(vq); + driver_addr = virtqueue_get_avail_addr(vq); + device_addr = virtqueue_get_used_addr(vq); + + if (ops->set_vq_address(mdev, index, + desc_addr, driver_addr, + device_addr)) { + err = -EINVAL; + goto err_vq; + } + + ops->set_vq_ready(mdev, index, 1); + + vq->priv = info; + info->vq = vq; + + spin_lock_irqsave(&vm_dev->lock, flags); + list_add(&info->node, &vm_dev->virtqueues); + spin_unlock_irqrestore(&vm_dev->lock, flags); + + return vq; + +err_vq: + vring_del_virtqueue(vq); +error_new_virtqueue: + ops->set_vq_ready(mdev, index, 0); + WARN_ON(ops->get_vq_ready(mdev, index)); + kfree(info); + return ERR_PTR(err); + +} + +static void virtio_mdev_del_vq(struct virtqueue *vq) +{ + struct virtio_mdev_device *vm_dev = to_virtio_mdev_device(vq->vdev); + struct mdev_device *mdev = vm_dev->mdev; + const struct virtio_mdev_device_ops *ops = mdev_get_virtio_ops(mdev); + struct virtio_mdev_vq_info *info = vq->priv; + unsigned int index = vq->index; + unsigned long flags; + + spin_lock_irqsave(&vm_dev->lock, flags); + list_del(&info->node); + spin_unlock_irqrestore(&vm_dev->lock, flags); + + /* Select and deactivate the queue */ + ops->set_vq_ready(mdev, index, 0); + WARN_ON(ops->get_vq_ready(mdev, index)); + + vring_del_virtqueue(vq); + + kfree(info); +} + +static void virtio_mdev_del_vqs(struct virtio_device *vdev) +{ + struct virtqueue *vq, *n; + + list_for_each_entry_safe(vq, n, &vdev->vqs, list) + virtio_mdev_del_vq(vq); +} + +static int virtio_mdev_find_vqs(struct virtio_device *vdev, unsigned nvqs, + struct virtqueue *vqs[], + vq_callback_t *callbacks[], + const char * const names[], + const bool *ctx, + struct irq_affinity *desc) +{ + struct virtio_mdev_device *vm_dev = to_virtio_mdev_device(vdev); + struct mdev_device *mdev = vm_get_mdev(vdev); + const struct virtio_mdev_device_ops *ops = mdev_get_virtio_ops(mdev); + struct virtio_mdev_callback cb; + int i, err, queue_idx = 0; + + for (i = 0; i < nvqs; ++i) { + if (!names[i]) { + vqs[i] = NULL; + continue; + } + + vqs[i] = virtio_mdev_setup_vq(vdev, queue_idx++, + callbacks[i], names[i], ctx ? + ctx[i] : false); + if (IS_ERR(vqs[i])) { + err = PTR_ERR(vqs[i]); + goto err_setup_vq; + } + } + + cb.callback = virtio_mdev_config_cb; + cb.private = vm_dev; + ops->set_config_cb(mdev, &cb); + + return 0; + +err_setup_vq: + virtio_mdev_del_vqs(vdev); + return err; +} + +static u64 virtio_mdev_get_features(struct virtio_device *vdev) +{ + struct mdev_device *mdev = vm_get_mdev(vdev); + const struct virtio_mdev_device_ops *ops = mdev_get_virtio_ops(mdev); + + return ops->get_features(mdev); +} + +static int virtio_mdev_finalize_features(struct virtio_device *vdev) +{ + struct mdev_device *mdev = vm_get_mdev(vdev); + const struct virtio_mdev_device_ops *ops = mdev_get_virtio_ops(mdev); + + /* Give virtio_ring a chance to accept features. */ + vring_transport_features(vdev); + + return ops->set_features(mdev, vdev->features); +} + +static const char *virtio_mdev_bus_name(struct virtio_device *vdev) +{ + struct virtio_mdev_device *vm_dev = to_virtio_mdev_device(vdev); + struct mdev_device *mdev = vm_dev->mdev; + + return dev_name(mdev_dev(mdev)); +} + +static const struct virtio_config_ops virtio_mdev_config_ops = { + .get = virtio_mdev_get, + .set = virtio_mdev_set, + .generation = virtio_mdev_generation, + .get_status = virtio_mdev_get_status, + .set_status = virtio_mdev_set_status, + .reset = virtio_mdev_reset, + .find_vqs = virtio_mdev_find_vqs, + .del_vqs = virtio_mdev_del_vqs, + .get_features = virtio_mdev_get_features, + .finalize_features = virtio_mdev_finalize_features, + .bus_name = virtio_mdev_bus_name, +}; + +static void virtio_mdev_release_dev(struct device *_d) +{ + struct virtio_device *vdev = + container_of(_d, struct virtio_device, dev); + struct virtio_mdev_device *vm_dev = + container_of(vdev, struct virtio_mdev_device, vdev); + struct mdev_device *mdev = vm_dev->mdev; + + devm_kfree(mdev_dev(mdev), vm_dev); +} + +static int virtio_mdev_probe(struct device *dev) +{ + struct mdev_device *mdev = mdev_from_dev(dev); + const struct virtio_mdev_device_ops *ops = mdev_get_virtio_ops(mdev); + struct virtio_mdev_device *vm_dev; + int rc; + + vm_dev = devm_kzalloc(dev, sizeof(*vm_dev), GFP_KERNEL); + if (!vm_dev) + return -ENOMEM; + + vm_dev->vdev.dev.parent = dev; + vm_dev->vdev.dev.release = virtio_mdev_release_dev; + vm_dev->vdev.config = &virtio_mdev_config_ops; + vm_dev->mdev = mdev; + INIT_LIST_HEAD(&vm_dev->virtqueues); + spin_lock_init(&vm_dev->lock); + + vm_dev->features = ops->get_mdev_features(mdev); + if (vm_dev->features != VIRTIO_MDEV_F_VERSION_1) { + dev_err(dev, "VIRTIO_MDEV_F_VERSION_1 is mandatory\n"); + return -ENXIO; + } + + vm_dev->vdev.id.device = ops->get_device_id(mdev); + if (vm_dev->vdev.id.device == 0) + return -ENODEV; + + vm_dev->vdev.id.vendor = ops->get_vendor_id(mdev); + rc = register_virtio_device(&vm_dev->vdev); + if (rc) + put_device(dev); + else + dev_set_drvdata(dev, vm_dev); + + return rc; +} + +static void virtio_mdev_remove(struct device *dev) +{ + struct virtio_mdev_device *vm_dev = dev_get_drvdata(dev); + + unregister_virtio_device(&vm_dev->vdev); +} + +static const struct mdev_class_id id_table[] = { + { MDEV_CLASS_ID_VIRTIO }, + { 0 }, +}; + +MODULE_DEVICE_TABLE(mdev, id_table); + +static struct mdev_driver virtio_mdev_driver = { + .name = "virtio_mdev", + .probe = virtio_mdev_probe, + .remove = virtio_mdev_remove, + .id_table = id_table, +}; + +static int __init virtio_mdev_init(void) +{ + return mdev_register_driver(&virtio_mdev_driver, THIS_MODULE); +} + +static void __exit virtio_mdev_exit(void) +{ + mdev_unregister_driver(&virtio_mdev_driver); +} + +module_init(virtio_mdev_init) +module_exit(virtio_mdev_exit) + +MODULE_VERSION(DRIVER_VERSION); +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR(DRIVER_AUTHOR); +MODULE_DESCRIPTION(DRIVER_DESC); From patchwork Wed Oct 23 13:07:52 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jason Wang X-Patchwork-Id: 11206839 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 50C0F1920 for ; Wed, 23 Oct 2019 13:27:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 13A2D21925 for ; Wed, 23 Oct 2019 13:27:44 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="RtcnXXWd" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2405866AbfJWN1m (ORCPT ); Wed, 23 Oct 2019 09:27:42 -0400 Received: from us-smtp-1.mimecast.com ([207.211.31.81]:28416 "EHLO us-smtp-delivery-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S2390018AbfJWN1l (ORCPT ); Wed, 23 Oct 2019 09:27:41 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1571837258; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=+QwaX1cTcMJpIPw4pGz+8aksK5AS2TfxLcxj423/inA=; b=RtcnXXWdCjI3vsU+BeThoCdeHnj10NwtiaqB/zOq/QtYojy4Ik5vOVGGPW1BVkszoQyPIT kIud1f6U6hS7TEXraXUh3gT79LIG87esWYBXN/aQK04mrRmTLQPh/+hmi/9GHWqG/i63AC LmokQ9IylgLsG69tckJSC8g3KhPRM9w= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-41-8WBxIzTIPzGprfzevcSLWw-1; Wed, 23 Oct 2019 09:27:34 -0400 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 6B77D801E66; Wed, 23 Oct 2019 13:27:30 +0000 (UTC) Received: from jason-ThinkPad-X1-Carbon-6th.redhat.com (ovpn-12-126.pek2.redhat.com [10.72.12.126]) by smtp.corp.redhat.com (Postfix) with ESMTP id D733C60126; Wed, 23 Oct 2019 13:25:34 +0000 (UTC) From: Jason Wang To: kvm@vger.kernel.org, linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, intel-gvt-dev@lists.freedesktop.org, kwankhede@nvidia.com, alex.williamson@redhat.com, mst@redhat.com, tiwei.bie@intel.com Cc: virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, cohuck@redhat.com, maxime.coquelin@redhat.com, cunming.liang@intel.com, zhihong.wang@intel.com, rob.miller@broadcom.com, xiao.w.wang@intel.com, haotian.wang@sifive.com, zhenyuw@linux.intel.com, zhi.a.wang@intel.com, jani.nikula@linux.intel.com, joonas.lahtinen@linux.intel.com, rodrigo.vivi@intel.com, airlied@linux.ie, daniel@ffwll.ch, farman@linux.ibm.com, pasic@linux.ibm.com, sebott@linux.ibm.com, oberpar@linux.ibm.com, heiko.carstens@de.ibm.com, gor@linux.ibm.com, borntraeger@de.ibm.com, akrowiak@linux.ibm.com, freude@linux.ibm.com, lingshan.zhu@intel.com, idos@mellanox.com, eperezma@redhat.com, lulu@redhat.com, parav@mellanox.com, christophe.de.dinechin@gmail.com, kevin.tian@intel.com, stefanha@redhat.com, Jason Wang Subject: [PATCH V5 6/6] docs: sample driver to demonstrate how to implement virtio-mdev framework Date: Wed, 23 Oct 2019 21:07:52 +0800 Message-Id: <20191023130752.18980-7-jasowang@redhat.com> In-Reply-To: <20191023130752.18980-1-jasowang@redhat.com> References: <20191023130752.18980-1-jasowang@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-MC-Unique: 8WBxIzTIPzGprfzevcSLWw-1 X-Mimecast-Spam-Score: 0 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org This sample driver creates mdev device that simulate virtio net device over virtio mdev transport. The device is implemented through vringh and workqueue. A device specific dma ops is to make sure HVA is used directly as the IOVA. This should be sufficient for kernel virtio driver to work. Only 'virtio' type is supported right now. I plan to add 'vhost' type on top which requires some virtual IOMMU implemented in this sample driver. Signed-off-by: Jason Wang --- MAINTAINERS | 1 + samples/Kconfig | 7 + samples/vfio-mdev/Makefile | 1 + samples/vfio-mdev/mvnet.c | 691 +++++++++++++++++++++++++++++++++++++ 4 files changed, 700 insertions(+) create mode 100644 samples/vfio-mdev/mvnet.c diff --git a/MAINTAINERS b/MAINTAINERS index 9e10ae9c2b4d..8b17927a81fd 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -17248,6 +17248,7 @@ F: include/linux/virtio*.h F: include/uapi/linux/virtio_*.h F: drivers/crypto/virtio/ F: mm/balloon_compaction.c +F: samples/vfio-mdev/mvnet.c VIRTIO BLOCK AND SCSI DRIVERS M: "Michael S. Tsirkin" diff --git a/samples/Kconfig b/samples/Kconfig index c8dacb4dda80..a1a1ca2c00b7 100644 --- a/samples/Kconfig +++ b/samples/Kconfig @@ -131,6 +131,13 @@ config SAMPLE_VFIO_MDEV_MDPY mediated device. It is a simple framebuffer and supports the region display interface (VFIO_GFX_PLANE_TYPE_REGION). +config SAMPLE_VIRTIO_MDEV_NET + tristate "Build virtio mdev net example mediated device sample code -- loadable modules only" + depends on VIRTIO_MDEV_DEVICE && VHOST_RING && m + help + Build a networking sample device for use as a virtio + mediated device. + config SAMPLE_VFIO_MDEV_MDPY_FB tristate "Build VFIO mdpy example guest fbdev driver -- loadable module only" depends on FB && m diff --git a/samples/vfio-mdev/Makefile b/samples/vfio-mdev/Makefile index 10d179c4fdeb..f34af90ed0a0 100644 --- a/samples/vfio-mdev/Makefile +++ b/samples/vfio-mdev/Makefile @@ -3,3 +3,4 @@ obj-$(CONFIG_SAMPLE_VFIO_MDEV_MTTY) += mtty.o obj-$(CONFIG_SAMPLE_VFIO_MDEV_MDPY) += mdpy.o obj-$(CONFIG_SAMPLE_VFIO_MDEV_MDPY_FB) += mdpy-fb.o obj-$(CONFIG_SAMPLE_VFIO_MDEV_MBOCHS) += mbochs.o +obj-$(CONFIG_SAMPLE_VIRTIO_MDEV_NET) += mvnet.o diff --git a/samples/vfio-mdev/mvnet.c b/samples/vfio-mdev/mvnet.c new file mode 100644 index 000000000000..a2a902d59fb7 --- /dev/null +++ b/samples/vfio-mdev/mvnet.c @@ -0,0 +1,691 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Mediated virtual virtio-net device driver. + * + * Copyright (c) 2019, Red Hat Inc. All rights reserved. + * Author: Jason Wang + * + * Sample driver that creates mdev device that simulates ethernet loopback + * device. + * + * Usage: + * + * # modprobe virtio_mdev + * # modprobe mvnet + * # cd /sys/devices/virtual/mvnet/mvnet/mdev_supported_types/mvnet-virtio + * # echo "83b8f4f2-509f-382f-3c1e-e6bfe0fa1001" > ./create + * # cd devices/83b8f4f2-509f-382f-3c1e-e6bfe0fa1001 + * # ls -d virtio0 + * virtio0 + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define VERSION_STRING "0.1" +#define DRIVER_AUTHOR "Red Hat Corporation" + +#define MVNET_CLASS_NAME "mvnet" +#define MVNET_NAME "mvnet" + +/* + * Global Structures + */ + +static struct mvnet_dev { + struct class *vd_class; + struct idr vd_idr; + struct device dev; +} mvnet_dev; + +struct mvnet_virtqueue { + struct vringh vring; + struct vringh_kiov iov; + unsigned short head; + bool ready; + u64 desc_addr; + u64 device_addr; + u64 driver_addr; + u32 num; + void *private; + irqreturn_t (*cb)(void *data); +}; + +#define MVNET_QUEUE_ALIGN PAGE_SIZE +#define MVNET_QUEUE_MAX 256 +#define MVNET_DEVICE_ID 0x1 +#define MVNET_VENDOR_ID 0 + +u64 mvnet_features = (1ULL << VIRTIO_F_ANY_LAYOUT) | + (1ULL << VIRTIO_F_VERSION_1) | + (1ULL << VIRTIO_F_IOMMU_PLATFORM); + +/* State of each mdev device */ +struct mvnet_state { + struct mvnet_virtqueue vqs[2]; + struct work_struct work; + spinlock_t lock; + struct mdev_device *mdev; + struct virtio_net_config config; + void *buffer; + u32 status; + u32 generation; + u64 features; + struct list_head next; +}; + +static struct mutex mdev_list_lock; +static struct list_head mdev_devices_list; + +static void mvnet_queue_ready(struct mvnet_state *mvnet, unsigned int idx) +{ + struct mvnet_virtqueue *vq = &mvnet->vqs[idx]; + int ret; + + ret = vringh_init_kern(&vq->vring, mvnet_features, MVNET_QUEUE_MAX, + false, (struct vring_desc *)vq->desc_addr, + (struct vring_avail *)vq->driver_addr, + (struct vring_used *)vq->device_addr); +} + +static void mvnet_vq_reset(struct mvnet_virtqueue *vq) +{ + vq->ready = 0; + vq->desc_addr = 0; + vq->driver_addr = 0; + vq->device_addr = 0; + vq->cb = NULL; + vq->private = NULL; + vringh_init_kern(&vq->vring, mvnet_features, MVNET_QUEUE_MAX, + false, 0, 0, 0); +} + +static void mvnet_reset(struct mvnet_state *mvnet) +{ + int i; + + for (i = 0; i < 2; i++) + mvnet_vq_reset(&mvnet->vqs[i]); + + mvnet->features = 0; + mvnet->status = 0; + ++mvnet->generation; +} + +static void mvnet_work(struct work_struct *work) +{ + struct mvnet_state *mvnet = container_of(work, struct + mvnet_state, work); + struct mvnet_virtqueue *txq = &mvnet->vqs[1]; + struct mvnet_virtqueue *rxq = &mvnet->vqs[0]; + size_t read, write, total_write; + int err; + int pkts = 0; + + spin_lock(&mvnet->lock); + + if (!txq->ready || !rxq->ready) + goto out; + + while (true) { + total_write = 0; + err = vringh_getdesc_kern(&txq->vring, &txq->iov, NULL, + &txq->head, GFP_ATOMIC); + if (err <= 0) + break; + + err = vringh_getdesc_kern(&rxq->vring, NULL, &rxq->iov, + &rxq->head, GFP_ATOMIC); + if (err <= 0) { + vringh_complete_kern(&txq->vring, txq->head, 0); + break; + } + + while (true) { + read = vringh_iov_pull_kern(&txq->iov, mvnet->buffer, + PAGE_SIZE); + if (read <= 0) + break; + + write = vringh_iov_push_kern(&rxq->iov, mvnet->buffer, + read); + if (write <= 0) + break; + + total_write += write; + } + + /* Make sure data is wrote before advancing index */ + smp_wmb(); + + vringh_complete_kern(&txq->vring, txq->head, 0); + vringh_complete_kern(&rxq->vring, rxq->head, total_write); + + /* Make sure used is visible before rasing the interrupt. */ + smp_wmb(); + + local_bh_disable(); + if (txq->cb) + txq->cb(txq->private); + if (rxq->cb) + rxq->cb(rxq->private); + local_bh_enable(); + + if (++pkts > 4) { + schedule_work(&mvnet->work); + goto out; + } + } + +out: + spin_unlock(&mvnet->lock); +} + +static dma_addr_t mvnet_map_page(struct device *dev, struct page *page, + unsigned long offset, size_t size, + enum dma_data_direction dir, + unsigned long attrs) +{ + /* Vringh can only use HVA */ + return (dma_addr_t)(page_address(page) + offset); +} + +static void mvnet_unmap_page(struct device *dev, dma_addr_t dma_addr, + size_t size, enum dma_data_direction dir, + unsigned long attrs) +{ +} + +static void *mvnet_alloc_coherent(struct device *dev, size_t size, + dma_addr_t *dma_addr, gfp_t flag, + unsigned long attrs) +{ + void *addr = kmalloc(size, flag); + + if (addr == NULL) + *dma_addr = DMA_MAPPING_ERROR; + else + *dma_addr = (dma_addr_t) addr; + + return addr; +} + +static void mvnet_free_coherent(struct device *dev, size_t size, + void *vaddr, dma_addr_t dma_addr, + unsigned long attrs) +{ + kfree((void *)dma_addr); +} + +static const struct dma_map_ops mvnet_dma_ops = { + .map_page = mvnet_map_page, + .unmap_page = mvnet_unmap_page, + .alloc = mvnet_alloc_coherent, + .free = mvnet_free_coherent, +}; + +static const struct virtio_mdev_device_ops virtio_mdev_ops; + +static int mvnet_create(struct kobject *kobj, struct mdev_device *mdev) +{ + struct mvnet_state *mvnet; + struct virtio_net_config *config; + struct device *dev = mdev_dev(mdev); + + if (!mdev) + return -EINVAL; + + mvnet = kzalloc(sizeof(struct mvnet_state), GFP_KERNEL); + if (mvnet == NULL) + return -ENOMEM; + + mvnet->buffer = kmalloc(PAGE_SIZE, GFP_KERNEL); + if (!mvnet->buffer) { + kfree(mvnet); + return -ENOMEM; + } + + config = &mvnet->config; + config->mtu = 1500; + config->status = VIRTIO_NET_S_LINK_UP; + eth_random_addr(config->mac); + + INIT_WORK(&mvnet->work, mvnet_work); + + spin_lock_init(&mvnet->lock); + mvnet->mdev = mdev; + mdev_set_drvdata(mdev, mvnet); + + mutex_lock(&mdev_list_lock); + list_add(&mvnet->next, &mdev_devices_list); + mutex_unlock(&mdev_list_lock); + + dev->coherent_dma_mask = DMA_BIT_MASK(64); + set_dma_ops(dev, &mvnet_dma_ops); + + mdev_set_virtio_ops(mdev, &virtio_mdev_ops); + + return 0; +} + +static int mvnet_remove(struct mdev_device *mdev) +{ + struct mvnet_state *mds, *tmp_mds; + struct mvnet_state *mvnet = mdev_get_drvdata(mdev); + int ret = -EINVAL; + + mutex_lock(&mdev_list_lock); + list_for_each_entry_safe(mds, tmp_mds, &mdev_devices_list, next) { + if (mvnet == mds) { + list_del(&mvnet->next); + mdev_set_drvdata(mdev, NULL); + kfree(mvnet->buffer); + kfree(mvnet); + ret = 0; + break; + } + } + mutex_unlock(&mdev_list_lock); + + return ret; +} + +static ssize_t +sample_mvnet_dev_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + if (mdev_from_dev(dev)) + return sprintf(buf, "This is MDEV %s\n", dev_name(dev)); + + return sprintf(buf, "\n"); +} + +static DEVICE_ATTR_RO(sample_mvnet_dev); + +static struct attribute *mvnet_dev_attrs[] = { + &dev_attr_sample_mvnet_dev.attr, + NULL, +}; + +static const struct attribute_group mvnet_dev_group = { + .name = "mvnet_dev", + .attrs = mvnet_dev_attrs, +}; + +static const struct attribute_group *mvnet_dev_groups[] = { + &mvnet_dev_group, + NULL, +}; + +static ssize_t +sample_mdev_dev_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + if (mdev_from_dev(dev)) + return sprintf(buf, "This is MDEV %s\n", dev_name(dev)); + + return sprintf(buf, "\n"); +} + +static DEVICE_ATTR_RO(sample_mdev_dev); + +static struct attribute *mdev_dev_attrs[] = { + &dev_attr_sample_mdev_dev.attr, + NULL, +}; + +static const struct attribute_group mdev_dev_group = { + .name = "vendor", + .attrs = mdev_dev_attrs, +}; + +static const struct attribute_group *mdev_dev_groups[] = { + &mdev_dev_group, + NULL, +}; + +#define MVNET_STRING_LEN 16 + +static ssize_t +name_show(struct kobject *kobj, struct device *dev, char *buf) +{ + char name[MVNET_STRING_LEN]; + const char *name_str = "virtio-net"; + + snprintf(name, MVNET_STRING_LEN, "%s", dev_driver_string(dev)); + if (!strcmp(kobj->name, name)) + return sprintf(buf, "%s\n", name_str); + + return -EINVAL; +} + +static MDEV_TYPE_ATTR_RO(name); + +static ssize_t +available_instances_show(struct kobject *kobj, struct device *dev, char *buf) +{ + return sprintf(buf, "%d\n", INT_MAX); +} + +static MDEV_TYPE_ATTR_RO(available_instances); + +static ssize_t device_api_show(struct kobject *kobj, struct device *dev, + char *buf) +{ + return sprintf(buf, "%s\n", VIRTIO_MDEV_DEVICE_API_STRING); +} + +static MDEV_TYPE_ATTR_RO(device_api); + +static struct attribute *mdev_types_attrs[] = { + &mdev_type_attr_name.attr, + &mdev_type_attr_device_api.attr, + &mdev_type_attr_available_instances.attr, + NULL, +}; + +static struct attribute_group mdev_type_group = { + .name = "virtio", + .attrs = mdev_types_attrs, +}; + +/* TBD: "vhost" type */ + +static struct attribute_group *mdev_type_groups[] = { + &mdev_type_group, + NULL, +}; + +static int mvnet_set_vq_address(struct mdev_device *mdev, u16 idx, + u64 desc_area, u64 driver_area, u64 device_area) +{ + struct mvnet_state *mvnet = mdev_get_drvdata(mdev); + struct mvnet_virtqueue *vq = &mvnet->vqs[idx]; + + vq->desc_addr = desc_area; + vq->driver_addr = driver_area; + vq->device_addr = device_area; + + return 0; +} + +static void mvnet_set_vq_num(struct mdev_device *mdev, u16 idx, u32 num) +{ + struct mvnet_state *mvnet = mdev_get_drvdata(mdev); + struct mvnet_virtqueue *vq = &mvnet->vqs[idx]; + + vq->num = num; +} + +static void mvnet_kick_vq(struct mdev_device *mdev, u16 idx) +{ + struct mvnet_state *mvnet = mdev_get_drvdata(mdev); + struct mvnet_virtqueue *vq = &mvnet->vqs[idx]; + + if (vq->ready) + schedule_work(&mvnet->work); +} + +static void mvnet_set_vq_cb(struct mdev_device *mdev, u16 idx, + struct virtio_mdev_callback *cb) +{ + struct mvnet_state *mvnet = mdev_get_drvdata(mdev); + struct mvnet_virtqueue *vq = &mvnet->vqs[idx]; + + vq->cb = cb->callback; + vq->private = cb->private; +} + +static void mvnet_set_vq_ready(struct mdev_device *mdev, u16 idx, bool ready) +{ + struct mvnet_state *mvnet = mdev_get_drvdata(mdev); + struct mvnet_virtqueue *vq = &mvnet->vqs[idx]; + + spin_lock(&mvnet->lock); + vq->ready = ready; + if (vq->ready) + mvnet_queue_ready(mvnet, idx); + spin_unlock(&mvnet->lock); +} + +static bool mvnet_get_vq_ready(struct mdev_device *mdev, u16 idx) +{ + struct mvnet_state *mvnet = mdev_get_drvdata(mdev); + struct mvnet_virtqueue *vq = &mvnet->vqs[idx]; + + return vq->ready; +} + +static int mvnet_set_vq_state(struct mdev_device *mdev, u16 idx, u64 state) +{ + struct mvnet_state *mvnet = mdev_get_drvdata(mdev); + struct mvnet_virtqueue *vq = &mvnet->vqs[idx]; + struct vringh *vrh = &vq->vring; + + spin_lock(&mvnet->lock); + vrh->last_avail_idx = state; + spin_unlock(&mvnet->lock); + + return 0; +} + +static u64 mvnet_get_vq_state(struct mdev_device *mdev, u16 idx) +{ + struct mvnet_state *mvnet = mdev_get_drvdata(mdev); + struct mvnet_virtqueue *vq = &mvnet->vqs[idx]; + struct vringh *vrh = &vq->vring; + + return vrh->last_avail_idx; +} + +static u16 mvnet_get_vq_align(struct mdev_device *mdev) +{ + return MVNET_QUEUE_ALIGN; +} + +static u64 mvnet_get_features(struct mdev_device *mdev) +{ + return mvnet_features; +} + +static int mvnet_set_features(struct mdev_device *mdev, u64 features) +{ + struct mvnet_state *mvnet = mdev_get_drvdata(mdev); + + /* DMA mapping must be done by driver */ + if (!(features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))) + return -EINVAL; + + mvnet->features = features & mvnet_features; + + return 0; +} + +static void mvnet_set_config_cb(struct mdev_device *mdev, + struct virtio_mdev_callback *cb) +{ + /* We don't support config interrupt */ +} + +static u16 mvnet_get_vq_num_max(struct mdev_device *mdev) +{ + return MVNET_QUEUE_MAX; +} + +static u32 mvnet_get_device_id(struct mdev_device *mdev) +{ + return MVNET_DEVICE_ID; +} + +static u32 mvnet_get_vendor_id(struct mdev_device *mdev) +{ + return MVNET_VENDOR_ID; +} + +static u8 mvnet_get_status(struct mdev_device *mdev) +{ + struct mvnet_state *mvnet = mdev_get_drvdata(mdev); + + return mvnet->status; +} + +static void mvnet_set_status(struct mdev_device *mdev, u8 status) +{ + struct mvnet_state *mvnet = mdev_get_drvdata(mdev); + + mvnet->status = status; + + if (status == 0) { + spin_lock(&mvnet->lock); + mvnet_reset(mvnet); + spin_unlock(&mvnet->lock); + } +} + +static void mvnet_get_config(struct mdev_device *mdev, unsigned int offset, + void *buf, unsigned int len) +{ + struct mvnet_state *mvnet = mdev_get_drvdata(mdev); + + if (offset + len < sizeof(struct virtio_net_config)) + memcpy(buf, &mvnet->config + offset, len); +} + +static void mvnet_set_config(struct mdev_device *mdev, unsigned int offset, + const void *buf, unsigned int len) +{ + /* No writable config supportted by mvnet */ +} + +static u64 mvnet_get_mdev_features(struct mdev_device *mdev) +{ + return VIRTIO_MDEV_F_VERSION_1; +} + +static u32 mvnet_get_generation(struct mdev_device *mdev) +{ + struct mvnet_state *mvnet = mdev_get_drvdata(mdev); + + return mvnet->generation; +} + +static const struct virtio_mdev_device_ops virtio_mdev_ops = { + .set_vq_address = mvnet_set_vq_address, + .set_vq_num = mvnet_set_vq_num, + .kick_vq = mvnet_kick_vq, + .set_vq_cb = mvnet_set_vq_cb, + .set_vq_ready = mvnet_set_vq_ready, + .get_vq_ready = mvnet_get_vq_ready, + .set_vq_state = mvnet_set_vq_state, + .get_vq_state = mvnet_get_vq_state, + .get_vq_align = mvnet_get_vq_align, + .get_features = mvnet_get_features, + .set_features = mvnet_set_features, + .set_config_cb = mvnet_set_config_cb, + .get_vq_num_max = mvnet_get_vq_num_max, + .get_device_id = mvnet_get_device_id, + .get_vendor_id = mvnet_get_vendor_id, + .get_status = mvnet_get_status, + .set_status = mvnet_set_status, + .get_config = mvnet_get_config, + .set_config = mvnet_set_config, + .get_mdev_features = mvnet_get_mdev_features, + .get_generation = mvnet_get_generation, +}; + +static const struct mdev_parent_ops mdev_fops = { + .owner = THIS_MODULE, + .dev_attr_groups = mvnet_dev_groups, + .mdev_attr_groups = mdev_dev_groups, + .supported_type_groups = mdev_type_groups, + .create = mvnet_create, + .remove = mvnet_remove, +}; + +static void mvnet_device_release(struct device *dev) +{ + dev_dbg(dev, "mvnet: released\n"); +} + +static int __init mvnet_dev_init(void) +{ + int ret = 0; + + pr_info("mvnet_dev: %s\n", __func__); + + memset(&mvnet_dev, 0, sizeof(mvnet_dev)); + + idr_init(&mvnet_dev.vd_idr); + + mvnet_dev.vd_class = class_create(THIS_MODULE, MVNET_CLASS_NAME); + + if (IS_ERR(mvnet_dev.vd_class)) { + pr_err("Error: failed to register mvnet_dev class\n"); + ret = PTR_ERR(mvnet_dev.vd_class); + goto failed1; + } + + mvnet_dev.dev.class = mvnet_dev.vd_class; + mvnet_dev.dev.release = mvnet_device_release; + dev_set_name(&mvnet_dev.dev, "%s", MVNET_NAME); + + ret = device_register(&mvnet_dev.dev); + if (ret) + goto failed2; + + ret = mdev_register_device(&mvnet_dev.dev, &mdev_fops); + if (ret) + goto failed3; + + mutex_init(&mdev_list_lock); + INIT_LIST_HEAD(&mdev_devices_list); + + goto all_done; + +failed3: + + device_unregister(&mvnet_dev.dev); +failed2: + class_destroy(mvnet_dev.vd_class); + +failed1: +all_done: + return ret; +} + +static void __exit mvnet_dev_exit(void) +{ + mvnet_dev.dev.bus = NULL; + mdev_unregister_device(&mvnet_dev.dev); + + device_unregister(&mvnet_dev.dev); + idr_destroy(&mvnet_dev.vd_idr); + class_destroy(mvnet_dev.vd_class); + mvnet_dev.vd_class = NULL; + pr_info("mvnet_dev: Unloaded!\n"); +} + +module_init(mvnet_dev_init) +module_exit(mvnet_dev_exit) + +MODULE_LICENSE("GPL v2"); +MODULE_INFO(supported, "Simulate loopback ethernet device over mdev"); +MODULE_VERSION(VERSION_STRING); +MODULE_AUTHOR(DRIVER_AUTHOR);