[SPARC64]: Abstract out mdesc accesses for better MD update handling.

Since we have to be able to handle MD updates, having an in-tree
set of data structures representing the MD objects actually makes
things more painful.

The MD itself is easy to parse, and we can implement the existing
interfaces using direct parsing of the MD binary image.

The MD is now reference counted, so accesses have to now take the
form:

	handle = mdesc_grab();

	... operations on MD ...

	mdesc_release(handle);

The only remaining issue are cases where code holds on to references
to MD property values.  mdesc_get_property() returns a direct pointer
to the property value, most cases just pull in the information they
need and discard the pointer, but there are few that use the pointer
directly over a long lifetime.  Those will be fixed up in a subsequent
changeset.

A preliminary handler for MD update events from domain services is
there, it is rudimentry but it works and handles all of the reference
counting.  It does not check the generation number of the MDs,
and it does not generate a "add/delete" list for notification to
interesting parties about MD changes but that will be forthcoming.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 9 insertions, 26 deletions

diff --git a/arch/sparc64/kernel/viohs.c b/arch/sparc64/kernel/viohs.c
index b0b1b8779342..15613add45d1 100644
--- a/arch/sparc64/kernel/viohs.c
+++ b/arch/sparc64/kernel/viohs.c
@@ -136,7 +136,7 @@ static int process_unknown(struct vio_driver_state *vio, void *arg)
 	       pkt->type, pkt->stype, pkt->stype_env, pkt->sid);
 
 	printk(KERN_ERR "vio: ID[%lu] Resetting connection.\n",
-	       vio->channel_id);
+	       vio->vdev->channel_id);
 
 	ldc_disconnect(vio->lp);
 
@@ -678,21 +678,11 @@ extern int vio_ldc_alloc(struct vio_driver_state *vio,
 {
 	struct ldc_channel_config cfg = *base_cfg;
 	struct ldc_channel *lp;
-	const u64 *id;
 
-	id = md_get_property(vio->endpoint, "id", NULL);
-	if (!id) {
-		printk(KERN_ERR "%s: Channel lacks id property.\n",
-		       vio->name);
-		return -ENODEV;
-	}
-
-	vio->channel_id = *id;
-
-	cfg.rx_irq = vio->rx_irq;
-	cfg.tx_irq = vio->tx_irq;
+	cfg.tx_irq = vio->vdev->tx_irq;
+	cfg.rx_irq = vio->vdev->rx_irq;
 
-	lp = ldc_alloc(vio->channel_id, &cfg, event_arg);
+	lp = ldc_alloc(vio->vdev->channel_id, &cfg, event_arg);
 	if (IS_ERR(lp))
 		return PTR_ERR(lp);
 
@@ -728,7 +718,7 @@ void vio_port_up(struct vio_driver_state *vio)
 		if (err)
 			printk(KERN_WARNING "%s: Port %lu bind failed, "
 			       "err=%d\n",
-			       vio->name, vio->channel_id, err);
+			       vio->name, vio->vdev->channel_id, err);
 	}
 
 	if (!err) {
@@ -736,7 +726,7 @@ void vio_port_up(struct vio_driver_state *vio)
 		if (err)
 			printk(KERN_WARNING "%s: Port %lu connect failed, "
 			       "err=%d\n",
-			       vio->name, vio->channel_id, err);
+			       vio->name, vio->vdev->channel_id, err);
 	}
 	if (err) {
 		unsigned long expires = jiffies + HZ;
@@ -757,9 +747,9 @@ static void vio_port_timer(unsigned long _arg)
 }
 
 int vio_driver_init(struct vio_driver_state *vio, struct vio_dev *vdev,
-		    u8 dev_class, struct mdesc_node *channel_endpoint,
-		    struct vio_version *ver_table, int ver_table_size,
-		    struct vio_driver_ops *ops, char *name)
+		    u8 dev_class, struct vio_version *ver_table,
+		    int ver_table_size, struct vio_driver_ops *ops,
+		    char *name)
 {
 	switch (dev_class) {
 	case VDEV_NETWORK:
@@ -777,9 +767,6 @@ int vio_driver_init(struct vio_driver_state *vio, struct vio_dev *vdev,
 	    !ops->handshake_complete)
 		return -EINVAL;
 
-	if (!channel_endpoint)
-		return -EINVAL;
-
 	if (!ver_table || ver_table_size < 0)
 		return -EINVAL;
 
@@ -793,10 +780,6 @@ int vio_driver_init(struct vio_driver_state *vio, struct vio_dev *vdev,
 	vio->dev_class = dev_class;
 	vio->vdev = vdev;
 
-	vio->endpoint = channel_endpoint;
-	vio->tx_irq = channel_endpoint->irqs[0];
-	vio->rx_irq = channel_endpoint->irqs[1];
-
 	vio->ver_table = ver_table;
 	vio->ver_table_entries = ver_table_size;