[POWERPC] Make the hvc_console output buffer size settable

So the iSeries console will be faster since it can send up to 200 bytes at
a time to the Hypervisor.  This only affects the tty part of the console,
the console writes are still in 16 byte lots.

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>

drivers/char/hvc_console.c

@@ -80,7 +80,8 @@ struct hvc_struct {
 	struct tty_struct *tty;
 	unsigned int count;
 	int do_wakeup;
-	char outbuf[N_OUTBUF] __ALIGNED__;
+	char *outbuf;
+	int outbuf_size;
 	int n_outbuf;
 	uint32_t vtermno;
 	struct hv_ops *ops;
@@ -505,7 +506,7 @@ static int hvc_write(struct tty_struct *tty, const unsigned char *buf, int count
 	if (hp->n_outbuf > 0)
 		hvc_push(hp);
 
-	while (count > 0 && (rsize = N_OUTBUF - hp->n_outbuf) > 0) {
+	while (count > 0 && (rsize = hp->outbuf_size - hp->n_outbuf) > 0) {
 		if (rsize > count)
 			rsize = count;
 		memcpy(hp->outbuf + hp->n_outbuf, buf, rsize);
@@ -538,7 +539,7 @@ static int hvc_write_room(struct tty_struct *tty)
 	if (!hp)
 		return -1;
 
-	return N_OUTBUF - hp->n_outbuf;
+	return hp->outbuf_size - hp->n_outbuf;
 }
 
 static int hvc_chars_in_buffer(struct tty_struct *tty)
@@ -728,12 +729,13 @@ static struct kobj_type hvc_kobj_type = {
 };
 
 struct hvc_struct __devinit *hvc_alloc(uint32_t vtermno, int irq,
-					struct hv_ops *ops)
+					struct hv_ops *ops, int outbuf_size)
 {
 	struct hvc_struct *hp;
 	int i;
 
-	hp = kmalloc(sizeof(*hp), GFP_KERNEL);
+	hp = kmalloc(ALIGN(sizeof(*hp), sizeof(long)) + outbuf_size,
+			GFP_KERNEL);
 	if (!hp)
 		return ERR_PTR(-ENOMEM);
 
@@ -742,6 +744,8 @@ struct hvc_struct __devinit *hvc_alloc(uint32_t vtermno, int irq,
 	hp->vtermno = vtermno;
 	hp->irq = irq;
 	hp->ops = ops;
+	hp->outbuf_size = outbuf_size;
+	hp->outbuf = &((char *)hp)[ALIGN(sizeof(*hp), sizeof(long))];
 
 	kobject_init(&hp->kobj);
 	hp->kobj.ktype = &hvc_kobj_type;

drivers/char/hvc_console.h

@@ -56,7 +56,7 @@ extern int hvc_instantiate(uint32_t vtermno, int index, struct hv_ops *ops);
 
 /* register a vterm for hvc tty operation (module_init or hotplug add) */
 extern struct hvc_struct * __devinit hvc_alloc(uint32_t vtermno, int irq,
-						 struct hv_ops *ops);
+				struct hv_ops *ops, int outbuf_size);
 /* remove a vterm from hvc tty operation (modele_exit or hotplug remove) */
 extern int __devexit hvc_remove(struct hvc_struct *hp);
 

drivers/char/hvc_iseries.c

@@ -221,7 +221,8 @@ static int __devinit hvc_vio_probe(struct vio_dev *vdev,
 
 	pi = &port_info[vdev->unit_address];
 
-	hp = hvc_alloc(vdev->unit_address, vdev->irq, &hvc_get_put_ops);
+	hp = hvc_alloc(vdev->unit_address, vdev->irq, &hvc_get_put_ops,
+			VIOCHAR_MAX_DATA);
 	if (IS_ERR(hp))
 		return PTR_ERR(hp);
 	pi->hp = hp;

drivers/char/hvc_rtas.c

@@ -94,7 +94,7 @@ static int hvc_rtas_init(void)
 
 	/* Allocate an hvc_struct for the console device we instantiated
 	 * earlier.  Save off hp so that we can return it on exit */
-	hp = hvc_alloc(hvc_rtas_cookie, NO_IRQ, &hvc_rtas_get_put_ops);
+	hp = hvc_alloc(hvc_rtas_cookie, NO_IRQ, &hvc_rtas_get_put_ops, 16);
 	if (IS_ERR(hp))
 		return PTR_ERR(hp);
 

drivers/char/hvc_vio.c

@@ -90,7 +90,8 @@ static int __devinit hvc_vio_probe(struct vio_dev *vdev,
 	if (!vdev || !id)
 		return -EPERM;
 
-	hp = hvc_alloc(vdev->unit_address, vdev->irq, &hvc_get_put_ops);
+	hp = hvc_alloc(vdev->unit_address, vdev->irq, &hvc_get_put_ops,
+			MAX_VIO_PUT_CHARS);
 	if (IS_ERR(hp))
 		return PTR_ERR(hp);
 	dev_set_drvdata(&vdev->dev, hp);