mirror of https://gitee.com/openkylin/linux.git
vfio-ccw: add some logging
Usually, the common I/O layer logs various things into the s390 cio debug feature, which has been very helpful in the past when looking at crash dumps. As vfio-ccw devices unbind from the standard I/O subchannel driver, we lose some information there. Let's introduce some vfio-ccw debug features and log some things there. (Unfortunately we cannot reuse the cio debug feature from a module.) Message-Id: <20190816151505.9853-2-cohuck@redhat.com> Reviewed-by: Eric Farman <farman@linux.ibm.com> Signed-off-by: Cornelia Huck <cohuck@redhat.com>
This commit is contained in:
Cornelia Huck
parent
416f79c23d
commit
60e05d1cf0
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@ -27,6 +27,9 @@ struct workqueue_struct *vfio_ccw_work_q;
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static struct kmem_cache *vfio_ccw_io_region;
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static struct kmem_cache *vfio_ccw_cmd_region;
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debug_info_t *vfio_ccw_debug_msg_id;
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debug_info_t *vfio_ccw_debug_trace_id;
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/*
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* Helpers
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*/
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@ -164,6 +167,9 @@ static int vfio_ccw_sch_probe(struct subchannel *sch)
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if (ret)
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goto out_disable;
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VFIO_CCW_MSG_EVENT(4, "bound to subchannel %x.%x.%04x\n",
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sch->schid.cssid, sch->schid.ssid,
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sch->schid.sch_no);
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return 0;
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out_disable:
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@ -194,6 +200,9 @@ static int vfio_ccw_sch_remove(struct subchannel *sch)
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kfree(private->cp.guest_cp);
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kfree(private);
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VFIO_CCW_MSG_EVENT(4, "unbound from subchannel %x.%x.%04x\n",
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sch->schid.cssid, sch->schid.ssid,
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sch->schid.sch_no);
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return 0;
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}
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@ -263,13 +272,46 @@ static struct css_driver vfio_ccw_sch_driver = {
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.sch_event = vfio_ccw_sch_event,
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};
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static int __init vfio_ccw_debug_init(void)
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{
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vfio_ccw_debug_msg_id = debug_register("vfio_ccw_msg", 16, 1,
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11 * sizeof(long));
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if (!vfio_ccw_debug_msg_id)
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goto out_unregister;
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debug_register_view(vfio_ccw_debug_msg_id, &debug_sprintf_view);
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debug_set_level(vfio_ccw_debug_msg_id, 2);
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vfio_ccw_debug_trace_id = debug_register("vfio_ccw_trace", 16, 1, 16);
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if (!vfio_ccw_debug_trace_id)
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goto out_unregister;
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debug_register_view(vfio_ccw_debug_trace_id, &debug_hex_ascii_view);
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debug_set_level(vfio_ccw_debug_trace_id, 2);
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return 0;
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out_unregister:
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debug_unregister(vfio_ccw_debug_msg_id);
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debug_unregister(vfio_ccw_debug_trace_id);
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return -1;
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}
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static void vfio_ccw_debug_exit(void)
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{
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debug_unregister(vfio_ccw_debug_msg_id);
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debug_unregister(vfio_ccw_debug_trace_id);
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}
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static int __init vfio_ccw_sch_init(void)
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{
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int ret = -ENOMEM;
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int ret;
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ret = vfio_ccw_debug_init();
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if (ret)
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return ret;
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vfio_ccw_work_q = create_singlethread_workqueue("vfio-ccw");
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if (!vfio_ccw_work_q)
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return -ENOMEM;
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if (!vfio_ccw_work_q) {
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ret = -ENOMEM;
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goto out_err;
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}
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vfio_ccw_io_region = kmem_cache_create_usercopy("vfio_ccw_io_region",
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sizeof(struct ccw_io_region), 0,
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@ -298,6 +340,7 @@ static int __init vfio_ccw_sch_init(void)
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kmem_cache_destroy(vfio_ccw_cmd_region);
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kmem_cache_destroy(vfio_ccw_io_region);
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destroy_workqueue(vfio_ccw_work_q);
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vfio_ccw_debug_exit();
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return ret;
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}
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@ -308,6 +351,7 @@ static void __exit vfio_ccw_sch_exit(void)
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kmem_cache_destroy(vfio_ccw_io_region);
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kmem_cache_destroy(vfio_ccw_cmd_region);
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destroy_workqueue(vfio_ccw_work_q);
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vfio_ccw_debug_exit();
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}
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module_init(vfio_ccw_sch_init);
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module_exit(vfio_ccw_sch_exit);
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@ -37,9 +37,14 @@ static int fsm_io_helper(struct vfio_ccw_private *private)
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goto out;
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}
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VFIO_CCW_TRACE_EVENT(5, "stIO");
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VFIO_CCW_TRACE_EVENT(5, dev_name(&sch->dev));
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/* Issue "Start Subchannel" */
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ccode = ssch(sch->schid, orb);
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VFIO_CCW_HEX_EVENT(5, &ccode, sizeof(ccode));
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switch (ccode) {
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case 0:
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/*
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@ -86,9 +91,14 @@ static int fsm_do_halt(struct vfio_ccw_private *private)
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spin_lock_irqsave(sch->lock, flags);
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VFIO_CCW_TRACE_EVENT(2, "haltIO");
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VFIO_CCW_TRACE_EVENT(2, dev_name(&sch->dev));
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/* Issue "Halt Subchannel" */
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ccode = hsch(sch->schid);
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VFIO_CCW_HEX_EVENT(2, &ccode, sizeof(ccode));
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switch (ccode) {
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case 0:
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/*
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@ -122,9 +132,14 @@ static int fsm_do_clear(struct vfio_ccw_private *private)
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spin_lock_irqsave(sch->lock, flags);
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VFIO_CCW_TRACE_EVENT(2, "clearIO");
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VFIO_CCW_TRACE_EVENT(2, dev_name(&sch->dev));
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/* Issue "Clear Subchannel" */
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ccode = csch(sch->schid);
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VFIO_CCW_HEX_EVENT(2, &ccode, sizeof(ccode));
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switch (ccode) {
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case 0:
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/*
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@ -149,6 +164,9 @@ static void fsm_notoper(struct vfio_ccw_private *private,
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{
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struct subchannel *sch = private->sch;
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VFIO_CCW_TRACE_EVENT(2, "notoper");
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VFIO_CCW_TRACE_EVENT(2, dev_name(&sch->dev));
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/*
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* TODO:
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* Probably we should send the machine check to the guest.
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@ -229,6 +247,7 @@ static void fsm_io_request(struct vfio_ccw_private *private,
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struct ccw_io_region *io_region = private->io_region;
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struct mdev_device *mdev = private->mdev;
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char *errstr = "request";
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struct subchannel_id schid = get_schid(private);
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private->state = VFIO_CCW_STATE_CP_PROCESSING;
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memcpy(scsw, io_region->scsw_area, sizeof(*scsw));
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@ -239,18 +258,32 @@ static void fsm_io_request(struct vfio_ccw_private *private,
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/* Don't try to build a cp if transport mode is specified. */
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if (orb->tm.b) {
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io_region->ret_code = -EOPNOTSUPP;
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VFIO_CCW_MSG_EVENT(2,
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"%pUl (%x.%x.%04x): transport mode\n",
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mdev_uuid(mdev), schid.cssid,
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schid.ssid, schid.sch_no);
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errstr = "transport mode";
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goto err_out;
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}
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io_region->ret_code = cp_init(&private->cp, mdev_dev(mdev),
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orb);
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if (io_region->ret_code) {
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VFIO_CCW_MSG_EVENT(2,
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"%pUl (%x.%x.%04x): cp_init=%d\n",
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mdev_uuid(mdev), schid.cssid,
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schid.ssid, schid.sch_no,
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io_region->ret_code);
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errstr = "cp init";
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goto err_out;
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}
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io_region->ret_code = cp_prefetch(&private->cp);
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if (io_region->ret_code) {
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VFIO_CCW_MSG_EVENT(2,
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"%pUl (%x.%x.%04x): cp_prefetch=%d\n",
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mdev_uuid(mdev), schid.cssid,
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schid.ssid, schid.sch_no,
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io_region->ret_code);
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errstr = "cp prefetch";
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cp_free(&private->cp);
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goto err_out;
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@ -259,23 +292,36 @@ static void fsm_io_request(struct vfio_ccw_private *private,
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/* Start channel program and wait for I/O interrupt. */
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io_region->ret_code = fsm_io_helper(private);
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if (io_region->ret_code) {
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VFIO_CCW_MSG_EVENT(2,
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"%pUl (%x.%x.%04x): fsm_io_helper=%d\n",
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mdev_uuid(mdev), schid.cssid,
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schid.ssid, schid.sch_no,
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io_region->ret_code);
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errstr = "cp fsm_io_helper";
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cp_free(&private->cp);
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goto err_out;
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}
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return;
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} else if (scsw->cmd.fctl & SCSW_FCTL_HALT_FUNC) {
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VFIO_CCW_MSG_EVENT(2,
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"%pUl (%x.%x.%04x): halt on io_region\n",
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mdev_uuid(mdev), schid.cssid,
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schid.ssid, schid.sch_no);
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/* halt is handled via the async cmd region */
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io_region->ret_code = -EOPNOTSUPP;
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goto err_out;
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} else if (scsw->cmd.fctl & SCSW_FCTL_CLEAR_FUNC) {
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VFIO_CCW_MSG_EVENT(2,
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"%pUl (%x.%x.%04x): clear on io_region\n",
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mdev_uuid(mdev), schid.cssid,
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schid.ssid, schid.sch_no);
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/* clear is handled via the async cmd region */
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io_region->ret_code = -EOPNOTSUPP;
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goto err_out;
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}
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err_out:
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trace_vfio_ccw_io_fctl(scsw->cmd.fctl, get_schid(private),
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trace_vfio_ccw_io_fctl(scsw->cmd.fctl, schid,
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io_region->ret_code, errstr);
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}
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@ -308,6 +354,9 @@ static void fsm_irq(struct vfio_ccw_private *private,
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{
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struct irb *irb = this_cpu_ptr(&cio_irb);
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VFIO_CCW_TRACE_EVENT(6, "IRQ");
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VFIO_CCW_TRACE_EVENT(6, dev_name(&private->sch->dev));
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memcpy(&private->irb, irb, sizeof(*irb));
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queue_work(vfio_ccw_work_q, &private->io_work);
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@ -124,6 +124,11 @@ static int vfio_ccw_mdev_create(struct kobject *kobj, struct mdev_device *mdev)
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private->mdev = mdev;
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private->state = VFIO_CCW_STATE_IDLE;
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VFIO_CCW_MSG_EVENT(2, "mdev %pUl, sch %x.%x.%04x: create\n",
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mdev_uuid(mdev), private->sch->schid.cssid,
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private->sch->schid.ssid,
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private->sch->schid.sch_no);
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return 0;
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}
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@ -132,6 +137,11 @@ static int vfio_ccw_mdev_remove(struct mdev_device *mdev)
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struct vfio_ccw_private *private =
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dev_get_drvdata(mdev_parent_dev(mdev));
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VFIO_CCW_MSG_EVENT(2, "mdev %pUl, sch %x.%x.%04x: remove\n",
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mdev_uuid(mdev), private->sch->schid.cssid,
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private->sch->schid.ssid,
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private->sch->schid.sch_no);
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if ((private->state != VFIO_CCW_STATE_NOT_OPER) &&
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(private->state != VFIO_CCW_STATE_STANDBY)) {
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if (!vfio_ccw_sch_quiesce(private->sch))
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@ -17,6 +17,7 @@
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#include <linux/eventfd.h>
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#include <linux/workqueue.h>
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#include <linux/vfio_ccw.h>
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#include <asm/debug.h>
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#include "css.h"
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#include "vfio_ccw_cp.h"
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@ -139,4 +140,20 @@ static inline void vfio_ccw_fsm_event(struct vfio_ccw_private *private,
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extern struct workqueue_struct *vfio_ccw_work_q;
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/* s390 debug feature, similar to base cio */
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extern debug_info_t *vfio_ccw_debug_msg_id;
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extern debug_info_t *vfio_ccw_debug_trace_id;
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#define VFIO_CCW_TRACE_EVENT(imp, txt) \
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debug_text_event(vfio_ccw_debug_trace_id, imp, txt)
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#define VFIO_CCW_MSG_EVENT(imp, args...) \
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debug_sprintf_event(vfio_ccw_debug_msg_id, imp, ##args)
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static inline void VFIO_CCW_HEX_EVENT(int level, void *data, int length)
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{
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debug_event(vfio_ccw_debug_trace_id, level, data, length);
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}
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#endif
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