From mboxrd@z Thu Jan 1 00:00:00 1970 From: Cornelia Huck Subject: [PULL 3/5] virtio/s390: support READ_STATUS command for virtio-ccw Date: Mon, 16 Jan 2017 15:04:31 +0100 Message-ID: <20170116140433.21301-4-cornelia.huck@de.ibm.com> References: <20170116140433.21301-1-cornelia.huck@de.ibm.com> Cc: borntraeger@de.ibm.com, jasowang@redhat.com, virtualization@lists.linux-foundation.org, linux-s390@vger.kernel.org, kvm@vger.kernel.org, Pierre Morel , Cornelia Huck To: mst@redhat.com Return-path: Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:41176 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751379AbdAPOEt (ORCPT ); Mon, 16 Jan 2017 09:04:49 -0500 Received: from pps.filterd (m0098421.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.20/8.16.0.20) with SMTP id v0GE3sv3126572 for ; Mon, 16 Jan 2017 09:04:48 -0500 Received: from e06smtp06.uk.ibm.com (e06smtp06.uk.ibm.com [195.75.94.102]) by mx0a-001b2d01.pphosted.com with ESMTP id 280xctbfc2-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Mon, 16 Jan 2017 09:04:48 -0500 Received: from localhost by e06smtp06.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Mon, 16 Jan 2017 14:04:46 -0000 In-Reply-To: <20170116140433.21301-1-cornelia.huck@de.ibm.com> Sender: kvm-owner@vger.kernel.org List-ID: From: Pierre Morel As virtio-1 introduced the possibility of the device manipulating the status byte, revision 2 of the virtio-ccw transport introduced a means of getting the status byte from the device via READ_STATUS. Let's wire it up for revisions >= 2 and fall back to returning the stored status byte if not supported. Signed-off-by: Pierre Morel Signed-off-by: Cornelia Huck --- drivers/s390/virtio/virtio_ccw.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/drivers/s390/virtio/virtio_ccw.c b/drivers/s390/virtio/virtio_ccw.c index 639ed4e6afd1..01e3dcfd7c64 100644 --- a/drivers/s390/virtio/virtio_ccw.c +++ b/drivers/s390/virtio/virtio_ccw.c @@ -145,6 +145,7 @@ static struct airq_info *airq_areas[MAX_AIRQ_AREAS]; #define CCW_CMD_WRITE_CONF 0x21 #define CCW_CMD_WRITE_STATUS 0x31 #define CCW_CMD_READ_VQ_CONF 0x32 +#define CCW_CMD_READ_STATUS 0x72 #define CCW_CMD_SET_IND_ADAPTER 0x73 #define CCW_CMD_SET_VIRTIO_REV 0x83 @@ -160,6 +161,7 @@ static struct airq_info *airq_areas[MAX_AIRQ_AREAS]; #define VIRTIO_CCW_DOING_SET_CONF_IND 0x04000000 #define VIRTIO_CCW_DOING_SET_IND_ADAPTER 0x08000000 #define VIRTIO_CCW_DOING_SET_VIRTIO_REV 0x10000000 +#define VIRTIO_CCW_DOING_READ_STATUS 0x20000000 #define VIRTIO_CCW_INTPARM_MASK 0xffff0000 static struct virtio_ccw_device *to_vc_device(struct virtio_device *vdev) @@ -892,6 +894,28 @@ static void virtio_ccw_set_config(struct virtio_device *vdev, static u8 virtio_ccw_get_status(struct virtio_device *vdev) { struct virtio_ccw_device *vcdev = to_vc_device(vdev); + u8 old_status = *vcdev->status; + struct ccw1 *ccw; + + if (vcdev->revision < 1) + return *vcdev->status; + + ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); + if (!ccw) + return old_status; + + ccw->cmd_code = CCW_CMD_READ_STATUS; + ccw->flags = 0; + ccw->count = sizeof(*vcdev->status); + ccw->cda = (__u32)(unsigned long)vcdev->status; + ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_STATUS); +/* + * If the channel program failed (should only happen if the device + * was hotunplugged, and then we clean up via the machine check + * handler anyway), vcdev->status was not overwritten and we just + * return the old status, which is fine. +*/ + kfree(ccw); return *vcdev->status; } @@ -987,6 +1011,7 @@ static void virtio_ccw_check_activity(struct virtio_ccw_device *vcdev, case VIRTIO_CCW_DOING_READ_CONFIG: case VIRTIO_CCW_DOING_WRITE_CONFIG: case VIRTIO_CCW_DOING_WRITE_STATUS: + case VIRTIO_CCW_DOING_READ_STATUS: case VIRTIO_CCW_DOING_SET_VQ: case VIRTIO_CCW_DOING_SET_IND: case VIRTIO_CCW_DOING_SET_CONF_IND: -- 2.11.0