Re: [PATCH 06/10] s390/cio: add basic protected virtualization support

Pierre Morel <pmorel@xxxxxxxxxxxxx> · Wed, 8 May 2019 16:23:53 +0200

On 26/04/2019 20:32, Halil Pasic wrote:
As virtio-ccw devices are channel devices, we need to use the dma area
for any communication with the hypervisor.

This patch addresses the most basic stuff (mostly what is required for
virtio-ccw), and does take care of QDIO or any devices.

An interesting side effect is that virtio structures are now going to
get allocated in 31 bit addressable storage.

Signed-off-by: Halil Pasic <pasic@xxxxxxxxxxxxx>
---
  arch/s390/include/asm/ccwdev.h   |  4 +++
  drivers/s390/cio/ccwreq.c        |  8 ++---
  drivers/s390/cio/device.c        | 65 +++++++++++++++++++++++++++++++++-------
  drivers/s390/cio/device_fsm.c    | 40 ++++++++++++-------------
  drivers/s390/cio/device_id.c     | 18 +++++------
  drivers/s390/cio/device_ops.c    | 21 +++++++++++--
  drivers/s390/cio/device_pgid.c   | 20 ++++++-------
  drivers/s390/cio/device_status.c | 24 +++++++--------
  drivers/s390/cio/io_sch.h        | 21 +++++++++----
  drivers/s390/virtio/virtio_ccw.c | 10 -------
  10 files changed, 148 insertions(+), 83 deletions(-)

diff --git a/arch/s390/include/asm/ccwdev.h b/arch/s390/include/asm/ccwdev.h
index a29dd430fb40..865ce1cb86d5 100644
--- a/arch/s390/include/asm/ccwdev.h
+++ b/arch/s390/include/asm/ccwdev.h
@@ -226,6 +226,10 @@ extern int ccw_device_enable_console(struct ccw_device *);
  extern void ccw_device_wait_idle(struct ccw_device *);
  extern int ccw_device_force_console(struct ccw_device *);

+extern void *ccw_device_dma_zalloc(struct ccw_device *cdev, size_t size);
+extern void ccw_device_dma_free(struct ccw_device *cdev,
+				void *cpu_addr, size_t size);
+
  int ccw_device_siosl(struct ccw_device *);

  extern void ccw_device_get_schid(struct ccw_device *, struct subchannel_id *);
diff --git a/drivers/s390/cio/ccwreq.c b/drivers/s390/cio/ccwreq.c
index 603268a33ea1..dafbceb311b3 100644
--- a/drivers/s390/cio/ccwreq.c
+++ b/drivers/s390/cio/ccwreq.c
@@ -63,7 +63,7 @@ static void ccwreq_stop(struct ccw_device *cdev, int rc)
  		return;
  	req->done = 1;
  	ccw_device_set_timeout(cdev, 0);
-	memset(&cdev->private->irb, 0, sizeof(struct irb));
+	memset(&cdev->private->dma_area->irb, 0, sizeof(struct irb));
  	if (rc && rc != -ENODEV && req->drc)
  		rc = req->drc;
  	req->callback(cdev, req->data, rc);
@@ -86,7 +86,7 @@ static void ccwreq_do(struct ccw_device *cdev)
  			continue;
  		}
  		/* Perform start function. */
-		memset(&cdev->private->irb, 0, sizeof(struct irb));
+		memset(&cdev->private->dma_area->irb, 0, sizeof(struct irb));
  		rc = cio_start(sch, cp, (u8) req->mask);
  		if (rc == 0) {
  			/* I/O started successfully. */
@@ -169,7 +169,7 @@ int ccw_request_cancel(struct ccw_device *cdev)
   */
  static enum io_status ccwreq_status(struct ccw_device *cdev, struct irb *lcirb)
  {
-	struct irb *irb = &cdev->private->irb;
+	struct irb *irb = &cdev->private->dma_area->irb;
  	struct cmd_scsw *scsw = &irb->scsw.cmd;
  	enum uc_todo todo;

@@ -187,7 +187,7 @@ static enum io_status ccwreq_status(struct ccw_device *cdev, struct irb *lcirb)
  		CIO_TRACE_EVENT(2, "sensedata");
  		CIO_HEX_EVENT(2, &cdev->private->dev_id,
  			      sizeof(struct ccw_dev_id));
-		CIO_HEX_EVENT(2, &cdev->private->irb.ecw, SENSE_MAX_COUNT);
+		CIO_HEX_EVENT(2, &cdev->private->dma_area->irb.ecw, SENSE_MAX_COUNT);
  		/* Check for command reject. */
  		if (irb->ecw[0] & SNS0_CMD_REJECT)
  			return IO_REJECTED;
diff --git a/drivers/s390/cio/device.c b/drivers/s390/cio/device.c
index 1540229a37bb..a3310ee14a4a 100644
--- a/drivers/s390/cio/device.c
+++ b/drivers/s390/cio/device.c
@@ -24,6 +24,7 @@
  #include <linux/timer.h>
  #include <linux/kernel_stat.h>
  #include <linux/sched/signal.h>
+#include <linux/dma-mapping.h>

  #include <asm/ccwdev.h>
  #include <asm/cio.h>
@@ -687,6 +688,9 @@ ccw_device_release(struct device *dev)
  	struct ccw_device *cdev;

  	cdev = to_ccwdev(dev);
+	cio_gp_dma_free(cdev->private->dma_pool, cdev->private->dma_area,
+			sizeof(*cdev->private->dma_area));
+	cio_gp_dma_destroy(cdev->private->dma_pool, &cdev->dev);
  	/* Release reference of parent subchannel. */
  	put_device(cdev->dev.parent);
  	kfree(cdev->private);
@@ -696,15 +700,31 @@ ccw_device_release(struct device *dev)
  static struct ccw_device * io_subchannel_allocate_dev(struct subchannel *sch)
  {
  	struct ccw_device *cdev;
+	struct gen_pool *dma_pool;

  	cdev  = kzalloc(sizeof(*cdev), GFP_KERNEL);
-	if (cdev) {
-		cdev->private = kzalloc(sizeof(struct ccw_device_private),
-					GFP_KERNEL | GFP_DMA);
-		if (cdev->private)
-			return cdev;
-	}
+	if (!cdev)
+		goto err_cdev;
+	cdev->private = kzalloc(sizeof(struct ccw_device_private),
+				GFP_KERNEL | GFP_DMA);
+	if (!cdev->private)
+		goto err_priv;
+	cdev->dev.dma_mask = &cdev->private->dma_mask;
+	*cdev->dev.dma_mask = *sch->dev.dma_mask;
+	cdev->dev.coherent_dma_mask = sch->dev.coherent_dma_mask;
+	dma_pool = cio_gp_dma_create(&cdev->dev, 1);
+	cdev->private->dma_pool = dma_pool;
+	cdev->private->dma_area = cio_gp_dma_zalloc(dma_pool, &cdev->dev,
+					sizeof(*cdev->private->dma_area));
+	if (!cdev->private->dma_area)
+		goto err_dma_area;
+	return cdev;
+err_dma_area:
+	cio_gp_dma_destroy(dma_pool, &cdev->dev);
+	kfree(cdev->private);
+err_priv:
  	kfree(cdev);
+err_cdev:
  	return ERR_PTR(-ENOMEM);
  }

@@ -884,7 +904,7 @@ io_subchannel_recog_done(struct ccw_device *cdev)
  			wake_up(&ccw_device_init_wq);
  		break;
  	case DEV_STATE_OFFLINE:
-		/*
+		/*
  		 * We can't register the device in interrupt context so
  		 * we schedule a work item.
  		 */
@@ -1062,6 +1082,14 @@ static int io_subchannel_probe(struct subchannel *sch)
  	if (!io_priv)
  		goto out_schedule;

+	io_priv->dma_area = dma_alloc_coherent(&sch->dev,
+				sizeof(*io_priv->dma_area),
+				&io_priv->dma_area_dma, GFP_KERNEL);
+	if (!io_priv->dma_area) {
+		kfree(io_priv);
+		goto out_schedule;
+	}
+
  	set_io_private(sch, io_priv);
  	css_schedule_eval(sch->schid);
  	return 0;
@@ -1088,6 +1116,8 @@ static int io_subchannel_remove(struct subchannel *sch)
  	set_io_private(sch, NULL);
  	spin_unlock_irq(sch->lock);
  out_free:
+	dma_free_coherent(&sch->dev, sizeof(*io_priv->dma_area),
+			  io_priv->dma_area, io_priv->dma_area_dma);
  	kfree(io_priv);
  	sysfs_remove_group(&sch->dev.kobj, &io_subchannel_attr_group);
  	return 0;
@@ -1593,20 +1623,31 @@ struct ccw_device * __init ccw_device_create_console(struct ccw_driver *drv)
  		return ERR_CAST(sch);

  	io_priv = kzalloc(sizeof(*io_priv), GFP_KERNEL | GFP_DMA);
-	if (!io_priv) {
-		put_device(&sch->dev);
-		return ERR_PTR(-ENOMEM);
-	}
+	if (!io_priv)
+		goto err_priv;
+	io_priv->dma_area = dma_alloc_coherent(&sch->dev,
+				sizeof(*io_priv->dma_area),
+				&io_priv->dma_area_dma, GFP_KERNEL);
+	if (!io_priv->dma_area)
+		goto err_dma_area;
  	set_io_private(sch, io_priv);
  	cdev = io_subchannel_create_ccwdev(sch);
  	if (IS_ERR(cdev)) {
  		put_device(&sch->dev);
+		dma_free_coherent(&sch->dev, sizeof(*io_priv->dma_area),
+				  io_priv->dma_area, io_priv->dma_area_dma);
  		kfree(io_priv);
  		return cdev;
  	}
  	cdev->drv = drv;
  	ccw_device_set_int_class(cdev);
  	return cdev;
+
+err_dma_area:
+		kfree(io_priv);
+err_priv:
+	put_device(&sch->dev);
+	return ERR_PTR(-ENOMEM);
  }

  void __init ccw_device_destroy_console(struct ccw_device *cdev)
@@ -1617,6 +1658,8 @@ void __init ccw_device_destroy_console(struct ccw_device *cdev)
  	set_io_private(sch, NULL);
  	put_device(&sch->dev);
  	put_device(&cdev->dev);
+	dma_free_coherent(&sch->dev, sizeof(*io_priv->dma_area),
+			  io_priv->dma_area, io_priv->dma_area_dma);
  	kfree(io_priv);
  }

diff --git a/drivers/s390/cio/device_fsm.c b/drivers/s390/cio/device_fsm.c
index 9169af7dbb43..fea23b44795b 100644
--- a/drivers/s390/cio/device_fsm.c
+++ b/drivers/s390/cio/device_fsm.c
@@ -67,8 +67,8 @@ static void ccw_timeout_log(struct ccw_device *cdev)
  			       sizeof(struct tcw), 0);
  	} else {
  		printk(KERN_WARNING "cio: orb indicates command mode\n");
-		if ((void *)(addr_t)orb->cmd.cpa == &private->sense_ccw ||
-		    (void *)(addr_t)orb->cmd.cpa == cdev->private->iccws)
+		if ((void *)(addr_t)orb->cmd.cpa == &private->dma_area->sense_ccw ||
+		    (void *)(addr_t)orb->cmd.cpa == cdev->private->dma_area->iccws)
  			printk(KERN_WARNING "cio: last channel program "
  			       "(intern):\n");
  		else
@@ -143,18 +143,18 @@ ccw_device_cancel_halt_clear(struct ccw_device *cdev)
  void ccw_device_update_sense_data(struct ccw_device *cdev)
  {
  	memset(&cdev->id, 0, sizeof(cdev->id));
-	cdev->id.cu_type   = cdev->private->senseid.cu_type;
-	cdev->id.cu_model  = cdev->private->senseid.cu_model;
-	cdev->id.dev_type  = cdev->private->senseid.dev_type;
-	cdev->id.dev_model = cdev->private->senseid.dev_model;
+	cdev->id.cu_type   = cdev->private->dma_area->senseid.cu_type;
+	cdev->id.cu_model  = cdev->private->dma_area->senseid.cu_model;
+	cdev->id.dev_type  = cdev->private->dma_area->senseid.dev_type;
+	cdev->id.dev_model = cdev->private->dma_area->senseid.dev_model;
  }

  int ccw_device_test_sense_data(struct ccw_device *cdev)
  {
-	return cdev->id.cu_type == cdev->private->senseid.cu_type &&
-		cdev->id.cu_model == cdev->private->senseid.cu_model &&
-		cdev->id.dev_type == cdev->private->senseid.dev_type &&
-		cdev->id.dev_model == cdev->private->senseid.dev_model;
+	return cdev->id.cu_type == cdev->private->dma_area->senseid.cu_type &&
+		cdev->id.cu_model == cdev->private->dma_area->senseid.cu_model &&
+		cdev->id.dev_type == cdev->private->dma_area->senseid.dev_type &&
+		cdev->id.dev_model == cdev->private->dma_area->senseid.dev_model;
  }

  /*
@@ -342,7 +342,7 @@ ccw_device_done(struct ccw_device *cdev, int state)
  		cio_disable_subchannel(sch);

  	/* Reset device status. */
-	memset(&cdev->private->irb, 0, sizeof(struct irb));
+	memset(&cdev->private->dma_area->irb, 0, sizeof(struct irb));

  	cdev->private->state = state;

@@ -509,13 +509,13 @@ void ccw_device_verify_done(struct ccw_device *cdev, int err)
  		ccw_device_done(cdev, DEV_STATE_ONLINE);
  		/* Deliver fake irb to device driver, if needed. */
  		if (cdev->private->flags.fake_irb) {
-			create_fake_irb(&cdev->private->irb,
+			create_fake_irb(&cdev->private->dma_area->irb,
  					cdev->private->flags.fake_irb);
  			cdev->private->flags.fake_irb = 0;
  			if (cdev->handler)
  				cdev->handler(cdev, cdev->private->intparm,
-					      &cdev->private->irb);
-			memset(&cdev->private->irb, 0, sizeof(struct irb));
+					      &cdev->private->dma_area->irb);
+			memset(&cdev->private->dma_area->irb, 0, sizeof(struct irb));
  		}
  		ccw_device_report_path_events(cdev);
  		ccw_device_handle_broken_paths(cdev);
@@ -672,7 +672,7 @@ ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event)

  	if (scsw_actl(&sch->schib.scsw) != 0 ||
  	    (scsw_stctl(&sch->schib.scsw) & SCSW_STCTL_STATUS_PEND) ||
-	    (scsw_stctl(&cdev->private->irb.scsw) & SCSW_STCTL_STATUS_PEND)) {
+	    (scsw_stctl(&cdev->private->dma_area->irb.scsw) & SCSW_STCTL_STATUS_PEND)) {
  		/*
  		 * No final status yet or final status not yet delivered
  		 * to the device driver. Can't do path verification now,
@@ -719,7 +719,7 @@ static int ccw_device_call_handler(struct ccw_device *cdev)
  	 *  - fast notification was requested (primary status)
  	 *  - unsolicited interrupts
  	 */
-	stctl = scsw_stctl(&cdev->private->irb.scsw);
+	stctl = scsw_stctl(&cdev->private->dma_area->irb.scsw);
  	ending_status = (stctl & SCSW_STCTL_SEC_STATUS) ||
  		(stctl == (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)) ||
  		(stctl == SCSW_STCTL_STATUS_PEND);
@@ -735,9 +735,9 @@ static int ccw_device_call_handler(struct ccw_device *cdev)

  	if (cdev->handler)
  		cdev->handler(cdev, cdev->private->intparm,
-			      &cdev->private->irb);
+			      &cdev->private->dma_area->irb);

-	memset(&cdev->private->irb, 0, sizeof(struct irb));
+	memset(&cdev->private->dma_area->irb, 0, sizeof(struct irb));
  	return 1;
  }

@@ -759,7 +759,7 @@ ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event)
  			/* Unit check but no sense data. Need basic sense. */
  			if (ccw_device_do_sense(cdev, irb) != 0)
  				goto call_handler_unsol;
-			memcpy(&cdev->private->irb, irb, sizeof(struct irb));
+			memcpy(&cdev->private->dma_area->irb, irb, sizeof(struct irb));
  			cdev->private->state = DEV_STATE_W4SENSE;
  			cdev->private->intparm = 0;
  			return;
@@ -842,7 +842,7 @@ ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event)
  	if (scsw_fctl(&irb->scsw) &
  	    (SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) {
  		cdev->private->flags.dosense = 0;
-		memset(&cdev->private->irb, 0, sizeof(struct irb));
+		memset(&cdev->private->dma_area->irb, 0, sizeof(struct irb));
  		ccw_device_accumulate_irb(cdev, irb);
  		goto call_handler;
  	}
diff --git a/drivers/s390/cio/device_id.c b/drivers/s390/cio/device_id.c
index f6df83a9dfbb..ea8a0fc6c0b6 100644
--- a/drivers/s390/cio/device_id.c
+++ b/drivers/s390/cio/device_id.c
@@ -99,7 +99,7 @@ static int diag210_to_senseid(struct senseid *senseid, struct diag210 *diag)
  static int diag210_get_dev_info(struct ccw_device *cdev)
  {
  	struct ccw_dev_id *dev_id = &cdev->private->dev_id;
-	struct senseid *senseid = &cdev->private->senseid;
+	struct senseid *senseid = &cdev->private->dma_area->senseid;
  	struct diag210 diag_data;
  	int rc;

@@ -134,8 +134,8 @@ static int diag210_get_dev_info(struct ccw_device *cdev)
  static void snsid_init(struct ccw_device *cdev)
  {
  	cdev->private->flags.esid = 0;
-	memset(&cdev->private->senseid, 0, sizeof(cdev->private->senseid));
-	cdev->private->senseid.cu_type = 0xffff;
+	memset(&cdev->private->dma_area->senseid, 0, sizeof(cdev->private->dma_area->senseid));
+	cdev->private->dma_area->senseid.cu_type = 0xffff;
  }

  /*
@@ -143,16 +143,16 @@ static void snsid_init(struct ccw_device *cdev)
   */
  static int snsid_check(struct ccw_device *cdev, void *data)
  {
-	struct cmd_scsw *scsw = &cdev->private->irb.scsw.cmd;
+	struct cmd_scsw *scsw = &cdev->private->dma_area->irb.scsw.cmd;
  	int len = sizeof(struct senseid) - scsw->count;

  	/* Check for incomplete SENSE ID data. */
  	if (len < SENSE_ID_MIN_LEN)
  		goto out_restart;
-	if (cdev->private->senseid.cu_type == 0xffff)
+	if (cdev->private->dma_area->senseid.cu_type == 0xffff)
  		goto out_restart;
  	/* Check for incompatible SENSE ID data. */
-	if (cdev->private->senseid.reserved != 0xff)
+	if (cdev->private->dma_area->senseid.reserved != 0xff)
  		return -EOPNOTSUPP;
  	/* Check for extended-identification information. */
  	if (len > SENSE_ID_BASIC_LEN)
@@ -170,7 +170,7 @@ static int snsid_check(struct ccw_device *cdev, void *data)
  static void snsid_callback(struct ccw_device *cdev, void *data, int rc)
  {
  	struct ccw_dev_id *id = &cdev->private->dev_id;
-	struct senseid *senseid = &cdev->private->senseid;
+	struct senseid *senseid = &cdev->private->dma_area->senseid;
  	int vm = 0;

  	if (rc && MACHINE_IS_VM) {
@@ -200,7 +200,7 @@ void ccw_device_sense_id_start(struct ccw_device *cdev)
  {
  	struct subchannel *sch = to_subchannel(cdev->dev.parent);
  	struct ccw_request *req = &cdev->private->req;
-	struct ccw1 *cp = cdev->private->iccws;
+	struct ccw1 *cp = cdev->private->dma_area->iccws;

  	CIO_TRACE_EVENT(4, "snsid");
  	CIO_HEX_EVENT(4, &cdev->private->dev_id, sizeof(cdev->private->dev_id));
@@ -208,7 +208,7 @@ void ccw_device_sense_id_start(struct ccw_device *cdev)
  	snsid_init(cdev);
  	/* Channel program setup. */
  	cp->cmd_code	= CCW_CMD_SENSE_ID;
-	cp->cda		= (u32) (addr_t) &cdev->private->senseid;
+	cp->cda		= (u32) (addr_t) &cdev->private->dma_area->senseid;
  	cp->count	= sizeof(struct senseid);
  	cp->flags	= CCW_FLAG_SLI;
  	/* Request setup. */
diff --git a/drivers/s390/cio/device_ops.c b/drivers/s390/cio/device_ops.c
index 4435ae0b3027..be4acfa9265a 100644
--- a/drivers/s390/cio/device_ops.c
+++ b/drivers/s390/cio/device_ops.c
@@ -429,8 +429,8 @@ struct ciw *ccw_device_get_ciw(struct ccw_device *cdev, __u32 ct)
  	if (cdev->private->flags.esid == 0)
  		return NULL;
  	for (ciw_cnt = 0; ciw_cnt < MAX_CIWS; ciw_cnt++)
-		if (cdev->private->senseid.ciw[ciw_cnt].ct == ct)
-			return cdev->private->senseid.ciw + ciw_cnt;
+		if (cdev->private->dma_area->senseid.ciw[ciw_cnt].ct == ct)
+			return cdev->private->dma_area->senseid.ciw + ciw_cnt;
  	return NULL;
  }

@@ -699,6 +699,23 @@ void ccw_device_get_schid(struct ccw_device *cdev, struct subchannel_id *schid)
  }
  EXPORT_SYMBOL_GPL(ccw_device_get_schid);

+/**
+ * Allocate zeroed dma coherent 31 bit addressable memory using
+ * the subchannels dma pool. Maximal size of allocation supported
+ * is PAGE_SIZE.
+ */
+void *ccw_device_dma_zalloc(struct ccw_device *cdev, size_t size)
+{
+	return cio_gp_dma_zalloc(cdev->private->dma_pool, &cdev->dev, size);
+}
+EXPORT_SYMBOL(ccw_device_dma_zalloc);
+
+void ccw_device_dma_free(struct ccw_device *cdev, void *cpu_addr, size_t size)
+{
+	cio_gp_dma_free(cdev->private->dma_pool, cpu_addr, size);
+}
+EXPORT_SYMBOL(ccw_device_dma_free);
+
  EXPORT_SYMBOL(ccw_device_set_options_mask);
  EXPORT_SYMBOL(ccw_device_set_options);
  EXPORT_SYMBOL(ccw_device_clear_options);
diff --git a/drivers/s390/cio/device_pgid.c b/drivers/s390/cio/device_pgid.c
index d30a3babf176..e97baa89cbf8 100644
--- a/drivers/s390/cio/device_pgid.c
+++ b/drivers/s390/cio/device_pgid.c
@@ -57,7 +57,7 @@ static void verify_done(struct ccw_device *cdev, int rc)
  static void nop_build_cp(struct ccw_device *cdev)
  {
  	struct ccw_request *req = &cdev->private->req;
-	struct ccw1 *cp = cdev->private->iccws;
+	struct ccw1 *cp = cdev->private->dma_area->iccws;

  	cp->cmd_code	= CCW_CMD_NOOP;
  	cp->cda		= 0;
@@ -134,9 +134,9 @@ static void nop_callback(struct ccw_device *cdev, void *data, int rc)
  static void spid_build_cp(struct ccw_device *cdev, u8 fn)
  {
  	struct ccw_request *req = &cdev->private->req;
-	struct ccw1 *cp = cdev->private->iccws;
+	struct ccw1 *cp = cdev->private->dma_area->iccws;
  	int i = pathmask_to_pos(req->lpm);
-	struct pgid *pgid = &cdev->private->pgid[i];
+	struct pgid *pgid = &cdev->private->dma_area->pgid[i];

  	pgid->inf.fc	= fn;
  	cp->cmd_code	= CCW_CMD_SET_PGID;
@@ -300,7 +300,7 @@ static int pgid_cmp(struct pgid *p1, struct pgid *p2)
  static void pgid_analyze(struct ccw_device *cdev, struct pgid **p,
  			 int *mismatch, u8 *reserved, u8 *reset)
  {
-	struct pgid *pgid = &cdev->private->pgid[0];
+	struct pgid *pgid = &cdev->private->dma_area->pgid[0];
  	struct pgid *first = NULL;
  	int lpm;
  	int i;
@@ -342,7 +342,7 @@ static u8 pgid_to_donepm(struct ccw_device *cdev)
  		lpm = 0x80 >> i;
  		if ((cdev->private->pgid_valid_mask & lpm) == 0)
  			continue;
-		pgid = &cdev->private->pgid[i];
+		pgid = &cdev->private->dma_area->pgid[i];
  		if (sch->opm & lpm) {
  			if (pgid->inf.ps.state1 != SNID_STATE1_GROUPED)
  				continue;
@@ -368,7 +368,7 @@ static void pgid_fill(struct ccw_device *cdev, struct pgid *pgid)
  	int i;

  	for (i = 0; i < 8; i++)
-		memcpy(&cdev->private->pgid[i], pgid, sizeof(struct pgid));
+		memcpy(&cdev->private->dma_area->pgid[i], pgid, sizeof(struct pgid));
  }

  /*
@@ -435,12 +435,12 @@ static void snid_done(struct ccw_device *cdev, int rc)
  static void snid_build_cp(struct ccw_device *cdev)
  {
  	struct ccw_request *req = &cdev->private->req;
-	struct ccw1 *cp = cdev->private->iccws;
+	struct ccw1 *cp = cdev->private->dma_area->iccws;
  	int i = pathmask_to_pos(req->lpm);

  	/* Channel program setup. */
  	cp->cmd_code	= CCW_CMD_SENSE_PGID;
-	cp->cda		= (u32) (addr_t) &cdev->private->pgid[i];
+	cp->cda		= (u32) (addr_t) &cdev->private->dma_area->pgid[i];
  	cp->count	= sizeof(struct pgid);
  	cp->flags	= CCW_FLAG_SLI;
  	req->cp		= cp;
@@ -516,7 +516,7 @@ static void verify_start(struct ccw_device *cdev)
  	sch->lpm = sch->schib.pmcw.pam;

  	/* Initialize PGID data. */
-	memset(cdev->private->pgid, 0, sizeof(cdev->private->pgid));
+	memset(cdev->private->dma_area->pgid, 0, sizeof(cdev->private->dma_area->pgid));
  	cdev->private->pgid_valid_mask = 0;
  	cdev->private->pgid_todo_mask = sch->schib.pmcw.pam;
  	cdev->private->path_notoper_mask = 0;
@@ -626,7 +626,7 @@ struct stlck_data {
  static void stlck_build_cp(struct ccw_device *cdev, void *buf1, void *buf2)
  {
  	struct ccw_request *req = &cdev->private->req;
-	struct ccw1 *cp = cdev->private->iccws;
+	struct ccw1 *cp = cdev->private->dma_area->iccws;

  	cp[0].cmd_code = CCW_CMD_STLCK;
  	cp[0].cda = (u32) (addr_t) buf1;
diff --git a/drivers/s390/cio/device_status.c b/drivers/s390/cio/device_status.c
index 7d5c7892b2c4..a9aabde604f4 100644
--- a/drivers/s390/cio/device_status.c
+++ b/drivers/s390/cio/device_status.c
@@ -79,15 +79,15 @@ ccw_device_accumulate_ecw(struct ccw_device *cdev, struct irb *irb)
  	 * are condition that have to be met for the extended control
  	 * bit to have meaning. Sick.
  	 */
-	cdev->private->irb.scsw.cmd.ectl = 0;
+	cdev->private->dma_area->irb.scsw.cmd.ectl = 0;
  	if ((irb->scsw.cmd.stctl & SCSW_STCTL_ALERT_STATUS) &&
  	    !(irb->scsw.cmd.stctl & SCSW_STCTL_INTER_STATUS))
-		cdev->private->irb.scsw.cmd.ectl = irb->scsw.cmd.ectl;
+		cdev->private->dma_area->irb.scsw.cmd.ectl = irb->scsw.cmd.ectl;
  	/* Check if extended control word is valid. */
-	if (!cdev->private->irb.scsw.cmd.ectl)
+	if (!cdev->private->dma_area->irb.scsw.cmd.ectl)
  		return;
  	/* Copy concurrent sense / model dependent information. */
-	memcpy (&cdev->private->irb.ecw, irb->ecw, sizeof (irb->ecw));
+	memcpy (&cdev->private->dma_area->irb.ecw, irb->ecw, sizeof (irb->ecw));


NIT, may be you should take  the opportunity to remove the blanc before 
the parenthesis.

NIT again, Some lines over 80 character too.

just a first check, I will go deeper later.

Regards,
Pierre

--
Pierre Morel
Linux/KVM/QEMU in Böblingen - Germany







