Merge branches 'v5.20/vfio/spapr_tce-unused-arg-v1', 'v5.20/vfio/comment-typo-v1' and 'v5.20/vfio/vfio-ccw-rework-v4' into v5.20/vfio/next

Author: awilliam

drivers/s390/cio/vfio_ccw_async.c

@@ -8,7 +8,6 @@
  */
 
 #include <linux/vfio.h>
-#include <linux/mdev.h>
 
 #include "vfio_ccw_private.h"
 

drivers/s390/cio/vfio_ccw_drv.c

@@ -14,7 +14,6 @@
 #include <linux/init.h>
 #include <linux/device.h>
 #include <linux/slab.h>
-#include <linux/uuid.h>
 #include <linux/mdev.h>
 
 #include <asm/isc.h>
@@ -42,13 +41,6 @@ int vfio_ccw_sch_quiesce(struct subchannel *sch)
 	DECLARE_COMPLETION_ONSTACK(completion);
 	int iretry, ret = 0;
 
-	spin_lock_irq(sch->lock);
-	if (!sch->schib.pmcw.ena)
-		goto out_unlock;
-	ret = cio_disable_subchannel(sch);
-	if (ret != -EBUSY)
-		goto out_unlock;
-
 	iretry = 255;
 	do {
 
@@ -75,9 +67,7 @@ int vfio_ccw_sch_quiesce(struct subchannel *sch)
 		spin_lock_irq(sch->lock);
 		ret = cio_disable_subchannel(sch);
 	} while (ret == -EBUSY);
-out_unlock:
-	private->state = VFIO_CCW_STATE_NOT_OPER;
-	spin_unlock_irq(sch->lock);
+
 	return ret;
 }
 
@@ -107,9 +97,10 @@ static void vfio_ccw_sch_io_todo(struct work_struct *work)
 	/*
 	 * Reset to IDLE only if processing of a channel program
 	 * has finished. Do not overwrite a possible processing
-	 * state if the final interrupt was for HSCH or CSCH.
+	 * state if the interrupt was unsolicited, or if the final
+	 * interrupt was for HSCH or CSCH.
 	 */
-	if (private->mdev && cp_is_finished)
+	if (cp_is_finished)
 		private->state = VFIO_CCW_STATE_IDLE;
 
 	if (private->io_trigger)
@@ -147,7 +138,7 @@ static struct vfio_ccw_private *vfio_ccw_alloc_private(struct subchannel *sch)
 
 	private->sch = sch;
 	mutex_init(&private->io_mutex);
-	private->state = VFIO_CCW_STATE_NOT_OPER;
+	private->state = VFIO_CCW_STATE_STANDBY;
 	INIT_LIST_HEAD(&private->crw);
 	INIT_WORK(&private->io_work, vfio_ccw_sch_io_todo);
 	INIT_WORK(&private->crw_work, vfio_ccw_crw_todo);
@@ -231,26 +222,15 @@ static int vfio_ccw_sch_probe(struct subchannel *sch)
 
 	dev_set_drvdata(&sch->dev, private);
 
-	spin_lock_irq(sch->lock);
-	sch->isc = VFIO_CCW_ISC;
-	ret = cio_enable_subchannel(sch, (u32)(unsigned long)sch);
-	spin_unlock_irq(sch->lock);
+	ret = mdev_register_device(&sch->dev, &vfio_ccw_mdev_driver);
 	if (ret)
 		goto out_free;
 
-	private->state = VFIO_CCW_STATE_STANDBY;
-
-	ret = vfio_ccw_mdev_reg(sch);
-	if (ret)
-		goto out_disable;
-
 	VFIO_CCW_MSG_EVENT(4, "bound to subchannel %x.%x.%04x\n",
 			   sch->schid.cssid, sch->schid.ssid,
 			   sch->schid.sch_no);
 	return 0;
 
-out_disable:
-	cio_disable_subchannel(sch);
 out_free:
 	dev_set_drvdata(&sch->dev, NULL);
 	vfio_ccw_free_private(private);
@@ -261,8 +241,8 @@ static void vfio_ccw_sch_remove(struct subchannel *sch)
 {
 	struct vfio_ccw_private *private = dev_get_drvdata(&sch->dev);
 
-	vfio_ccw_sch_quiesce(sch);
-	vfio_ccw_mdev_unreg(sch);
+	vfio_ccw_fsm_event(private, VFIO_CCW_EVENT_CLOSE);
+	mdev_unregister_device(&sch->dev);
 
 	dev_set_drvdata(&sch->dev, NULL);
 
@@ -275,7 +255,10 @@ static void vfio_ccw_sch_remove(struct subchannel *sch)
 
 static void vfio_ccw_sch_shutdown(struct subchannel *sch)
 {
-	vfio_ccw_sch_quiesce(sch);
+	struct vfio_ccw_private *private = dev_get_drvdata(&sch->dev);
+
+	vfio_ccw_fsm_event(private, VFIO_CCW_EVENT_CLOSE);
+	vfio_ccw_fsm_event(private, VFIO_CCW_EVENT_NOT_OPER);
 }
 
 /**
@@ -301,19 +284,11 @@ static int vfio_ccw_sch_event(struct subchannel *sch, int process)
 	if (work_pending(&sch->todo_work))
 		goto out_unlock;
 
-	if (cio_update_schib(sch)) {
-		vfio_ccw_fsm_event(private, VFIO_CCW_EVENT_NOT_OPER);
-		rc = 0;
-		goto out_unlock;
-	}
-
-	private = dev_get_drvdata(&sch->dev);
-	if (private->state == VFIO_CCW_STATE_NOT_OPER) {
-		private->state = private->mdev ? VFIO_CCW_STATE_IDLE :
-				 VFIO_CCW_STATE_STANDBY;
-	}
 	rc = 0;
 
+	if (cio_update_schib(sch))
+		vfio_ccw_fsm_event(private, VFIO_CCW_EVENT_NOT_OPER);
+
 out_unlock:
 	spin_unlock_irqrestore(sch->lock, flags);
 
@@ -358,8 +333,8 @@ static int vfio_ccw_chp_event(struct subchannel *sch,
 		return 0;
 
 	trace_vfio_ccw_chp_event(private->sch->schid, mask, event);
-	VFIO_CCW_MSG_EVENT(2, "%pUl (%x.%x.%04x): mask=0x%x event=%d\n",
-			   mdev_uuid(private->mdev), sch->schid.cssid,
+	VFIO_CCW_MSG_EVENT(2, "sch %x.%x.%04x: mask=0x%x event=%d\n",
+			   sch->schid.cssid,
 			   sch->schid.ssid, sch->schid.sch_no,
 			   mask, event);
 

drivers/s390/cio/vfio_ccw_fsm.c

@@ -10,7 +10,8 @@
  */
 
 #include <linux/vfio.h>
-#include <linux/mdev.h>
+
+#include <asm/isc.h>
 
 #include "ioasm.h"
 #include "vfio_ccw_private.h"
@@ -161,15 +162,22 @@ static void fsm_notoper(struct vfio_ccw_private *private,
 {
 	struct subchannel *sch = private->sch;
 
-	VFIO_CCW_TRACE_EVENT(2, "notoper");
-	VFIO_CCW_TRACE_EVENT(2, dev_name(&sch->dev));
+	VFIO_CCW_MSG_EVENT(2, "sch %x.%x.%04x: notoper event %x state %x\n",
+			   sch->schid.cssid,
+			   sch->schid.ssid,
+			   sch->schid.sch_no,
+			   event,
+			   private->state);
 
 	/*
 	 * TODO:
 	 * Probably we should send the machine check to the guest.
 	 */
 	css_sched_sch_todo(sch, SCH_TODO_UNREG);
 	private->state = VFIO_CCW_STATE_NOT_OPER;
+
+	/* This is usually handled during CLOSE event */
+	cp_free(&private->cp);
 }
 
 /*
@@ -242,7 +250,6 @@ static void fsm_io_request(struct vfio_ccw_private *private,
 	union orb *orb;
 	union scsw *scsw = &private->scsw;
 	struct ccw_io_region *io_region = private->io_region;
-	struct mdev_device *mdev = private->mdev;
 	char *errstr = "request";
 	struct subchannel_id schid = get_schid(private);
 
@@ -256,17 +263,17 @@ static void fsm_io_request(struct vfio_ccw_private *private,
 		if (orb->tm.b) {
 			io_region->ret_code = -EOPNOTSUPP;
 			VFIO_CCW_MSG_EVENT(2,
-					   "%pUl (%x.%x.%04x): transport mode\n",
-					   mdev_uuid(mdev), schid.cssid,
+					   "sch %x.%x.%04x: transport mode\n",
+					   schid.cssid,
 					   schid.ssid, schid.sch_no);
 			errstr = "transport mode";
 			goto err_out;
 		}
 		io_region->ret_code = cp_init(&private->cp, orb);
 		if (io_region->ret_code) {
 			VFIO_CCW_MSG_EVENT(2,
-					   "%pUl (%x.%x.%04x): cp_init=%d\n",
-					   mdev_uuid(mdev), schid.cssid,
+					   "sch %x.%x.%04x: cp_init=%d\n",
+					   schid.cssid,
 					   schid.ssid, schid.sch_no,
 					   io_region->ret_code);
 			errstr = "cp init";
@@ -276,8 +283,8 @@ static void fsm_io_request(struct vfio_ccw_private *private,
 		io_region->ret_code = cp_prefetch(&private->cp);
 		if (io_region->ret_code) {
 			VFIO_CCW_MSG_EVENT(2,
-					   "%pUl (%x.%x.%04x): cp_prefetch=%d\n",
-					   mdev_uuid(mdev), schid.cssid,
+					   "sch %x.%x.%04x: cp_prefetch=%d\n",
+					   schid.cssid,
 					   schid.ssid, schid.sch_no,
 					   io_region->ret_code);
 			errstr = "cp prefetch";
@@ -289,8 +296,8 @@ static void fsm_io_request(struct vfio_ccw_private *private,
 		io_region->ret_code = fsm_io_helper(private);
 		if (io_region->ret_code) {
 			VFIO_CCW_MSG_EVENT(2,
-					   "%pUl (%x.%x.%04x): fsm_io_helper=%d\n",
-					   mdev_uuid(mdev), schid.cssid,
+					   "sch %x.%x.%04x: fsm_io_helper=%d\n",
+					   schid.cssid,
 					   schid.ssid, schid.sch_no,
 					   io_region->ret_code);
 			errstr = "cp fsm_io_helper";
@@ -300,16 +307,16 @@ static void fsm_io_request(struct vfio_ccw_private *private,
 		return;
 	} else if (scsw->cmd.fctl & SCSW_FCTL_HALT_FUNC) {
 		VFIO_CCW_MSG_EVENT(2,
-				   "%pUl (%x.%x.%04x): halt on io_region\n",
-				   mdev_uuid(mdev), schid.cssid,
+				   "sch %x.%x.%04x: halt on io_region\n",
+				   schid.cssid,
 				   schid.ssid, schid.sch_no);
 		/* halt is handled via the async cmd region */
 		io_region->ret_code = -EOPNOTSUPP;
 		goto err_out;
 	} else if (scsw->cmd.fctl & SCSW_FCTL_CLEAR_FUNC) {
 		VFIO_CCW_MSG_EVENT(2,
-				   "%pUl (%x.%x.%04x): clear on io_region\n",
-				   mdev_uuid(mdev), schid.cssid,
+				   "sch %x.%x.%04x: clear on io_region\n",
+				   schid.cssid,
 				   schid.ssid, schid.sch_no);
 		/* clear is handled via the async cmd region */
 		io_region->ret_code = -EOPNOTSUPP;
@@ -366,6 +373,54 @@ static void fsm_irq(struct vfio_ccw_private *private,
 		complete(private->completion);
 }
 
+static void fsm_open(struct vfio_ccw_private *private,
+		     enum vfio_ccw_event event)
+{
+	struct subchannel *sch = private->sch;
+	int ret;
+
+	spin_lock_irq(sch->lock);
+	sch->isc = VFIO_CCW_ISC;
+	ret = cio_enable_subchannel(sch, (u32)(unsigned long)sch);
+	if (ret)
+		goto err_unlock;
+
+	private->state = VFIO_CCW_STATE_IDLE;
+	spin_unlock_irq(sch->lock);
+	return;
+
+err_unlock:
+	spin_unlock_irq(sch->lock);
+	vfio_ccw_fsm_event(private, VFIO_CCW_EVENT_NOT_OPER);
+}
+
+static void fsm_close(struct vfio_ccw_private *private,
+		      enum vfio_ccw_event event)
+{
+	struct subchannel *sch = private->sch;
+	int ret;
+
+	spin_lock_irq(sch->lock);
+
+	if (!sch->schib.pmcw.ena)
+		goto err_unlock;
+
+	ret = cio_disable_subchannel(sch);
+	if (ret == -EBUSY)
+		vfio_ccw_sch_quiesce(sch);
+	if (ret)
+		goto err_unlock;
+
+	private->state = VFIO_CCW_STATE_STANDBY;
+	spin_unlock_irq(sch->lock);
+	cp_free(&private->cp);
+	return;
+
+err_unlock:
+	spin_unlock_irq(sch->lock);
+	vfio_ccw_fsm_event(private, VFIO_CCW_EVENT_NOT_OPER);
+}
+
 /*
  * Device statemachine
  */
@@ -375,29 +430,39 @@ fsm_func_t *vfio_ccw_jumptable[NR_VFIO_CCW_STATES][NR_VFIO_CCW_EVENTS] = {
 		[VFIO_CCW_EVENT_IO_REQ]		= fsm_io_error,
 		[VFIO_CCW_EVENT_ASYNC_REQ]	= fsm_async_error,
 		[VFIO_CCW_EVENT_INTERRUPT]	= fsm_disabled_irq,
+		[VFIO_CCW_EVENT_OPEN]		= fsm_nop,
+		[VFIO_CCW_EVENT_CLOSE]		= fsm_nop,
 	},
 	[VFIO_CCW_STATE_STANDBY] = {
 		[VFIO_CCW_EVENT_NOT_OPER]	= fsm_notoper,
 		[VFIO_CCW_EVENT_IO_REQ]		= fsm_io_error,
 		[VFIO_CCW_EVENT_ASYNC_REQ]	= fsm_async_error,
-		[VFIO_CCW_EVENT_INTERRUPT]	= fsm_irq,
+		[VFIO_CCW_EVENT_INTERRUPT]	= fsm_disabled_irq,
+		[VFIO_CCW_EVENT_OPEN]		= fsm_open,
+		[VFIO_CCW_EVENT_CLOSE]		= fsm_notoper,
 	},
 	[VFIO_CCW_STATE_IDLE] = {
 		[VFIO_CCW_EVENT_NOT_OPER]	= fsm_notoper,
 		[VFIO_CCW_EVENT_IO_REQ]		= fsm_io_request,
 		[VFIO_CCW_EVENT_ASYNC_REQ]	= fsm_async_request,
 		[VFIO_CCW_EVENT_INTERRUPT]	= fsm_irq,
+		[VFIO_CCW_EVENT_OPEN]		= fsm_notoper,
+		[VFIO_CCW_EVENT_CLOSE]		= fsm_close,
 	},
 	[VFIO_CCW_STATE_CP_PROCESSING] = {
 		[VFIO_CCW_EVENT_NOT_OPER]	= fsm_notoper,
 		[VFIO_CCW_EVENT_IO_REQ]		= fsm_io_retry,
 		[VFIO_CCW_EVENT_ASYNC_REQ]	= fsm_async_retry,
 		[VFIO_CCW_EVENT_INTERRUPT]	= fsm_irq,
+		[VFIO_CCW_EVENT_OPEN]		= fsm_notoper,
+		[VFIO_CCW_EVENT_CLOSE]		= fsm_close,
 	},
 	[VFIO_CCW_STATE_CP_PENDING] = {
 		[VFIO_CCW_EVENT_NOT_OPER]	= fsm_notoper,
 		[VFIO_CCW_EVENT_IO_REQ]		= fsm_io_busy,
 		[VFIO_CCW_EVENT_ASYNC_REQ]	= fsm_async_request,
 		[VFIO_CCW_EVENT_INTERRUPT]	= fsm_irq,
+		[VFIO_CCW_EVENT_OPEN]		= fsm_notoper,
+		[VFIO_CCW_EVENT_CLOSE]		= fsm_close,
 	},
 };