Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6

Conflicts:

	arch/x86/kernel/io_apic.c

1 files changed, 0 insertions, 2378 deletions

diff --git a/arch/sparc64/kernel/ldc.c b/arch/sparc64/kernel/ldc.c
deleted file mode 100644
index d6898233..0000000
--- a/arch/sparc64/kernel/ldc.c
+++ /dev/null
@@ -1,2378 +0,0 @@
-/* ldc.c: Logical Domain Channel link-layer protocol driver.
- *
- * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net>
- */
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/slab.h>
-#include <linux/spinlock.h>
-#include <linux/delay.h>
-#include <linux/errno.h>
-#include <linux/string.h>
-#include <linux/scatterlist.h>
-#include <linux/interrupt.h>
-#include <linux/list.h>
-#include <linux/init.h>
-
-#include <asm/hypervisor.h>
-#include <asm/iommu.h>
-#include <asm/page.h>
-#include <asm/ldc.h>
-#include <asm/mdesc.h>
-
-#define DRV_MODULE_NAME		"ldc"
-#define PFX DRV_MODULE_NAME	": "
-#define DRV_MODULE_VERSION	"1.1"
-#define DRV_MODULE_RELDATE	"July 22, 2008"
-
-static char version[] __devinitdata =
-	DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
-#define LDC_PACKET_SIZE		64
-
-/* Packet header layout for unreliable and reliable mode frames.
- * When in RAW mode, packets are simply straight 64-byte payloads
- * with no headers.
- */
-struct ldc_packet {
-	u8			type;
-#define LDC_CTRL		0x01
-#define LDC_DATA		0x02
-#define LDC_ERR			0x10
-
-	u8			stype;
-#define LDC_INFO		0x01
-#define LDC_ACK			0x02
-#define LDC_NACK		0x04
-
-	u8			ctrl;
-#define LDC_VERS		0x01 /* Link Version		*/
-#define LDC_RTS			0x02 /* Request To Send		*/
-#define LDC_RTR			0x03 /* Ready To Receive	*/
-#define LDC_RDX			0x04 /* Ready for Data eXchange	*/
-#define LDC_CTRL_MSK		0x0f
-
-	u8			env;
-#define LDC_LEN			0x3f
-#define LDC_FRAG_MASK		0xc0
-#define LDC_START		0x40
-#define LDC_STOP		0x80
-
-	u32			seqid;
-
-	union {
-		u8		u_data[LDC_PACKET_SIZE - 8];
-		struct {
-			u32	pad;
-			u32	ackid;
-			u8	r_data[LDC_PACKET_SIZE - 8 - 8];
-		} r;
-	} u;
-};
-
-struct ldc_version {
-	u16 major;
-	u16 minor;
-};
-
-/* Ordered from largest major to lowest.  */
-static struct ldc_version ver_arr[] = {
-	{ .major = 1, .minor = 0 },
-};
-
-#define LDC_DEFAULT_MTU			(4 * LDC_PACKET_SIZE)
-#define LDC_DEFAULT_NUM_ENTRIES		(PAGE_SIZE / LDC_PACKET_SIZE)
-
-struct ldc_channel;
-
-struct ldc_mode_ops {
-	int (*write)(struct ldc_channel *, const void *, unsigned int);
-	int (*read)(struct ldc_channel *, void *, unsigned int);
-};
-
-static const struct ldc_mode_ops raw_ops;
-static const struct ldc_mode_ops nonraw_ops;
-static const struct ldc_mode_ops stream_ops;
-
-int ldom_domaining_enabled;
-
-struct ldc_iommu {
-	/* Protects arena alloc/free.  */
-	spinlock_t			lock;
-	struct iommu_arena		arena;
-	struct ldc_mtable_entry		*page_table;
-};
-
-struct ldc_channel {
-	/* Protects all operations that depend upon channel state.  */
-	spinlock_t			lock;
-
-	unsigned long			id;
-
-	u8				*mssbuf;
-	u32				mssbuf_len;
-	u32				mssbuf_off;
-
-	struct ldc_packet		*tx_base;
-	unsigned long			tx_head;
-	unsigned long			tx_tail;
-	unsigned long			tx_num_entries;
-	unsigned long			tx_ra;
-
-	unsigned long			tx_acked;
-
-	struct ldc_packet		*rx_base;
-	unsigned long			rx_head;
-	unsigned long			rx_tail;
-	unsigned long			rx_num_entries;
-	unsigned long			rx_ra;
-
-	u32				rcv_nxt;
-	u32				snd_nxt;
-
-	unsigned long			chan_state;
-
-	struct ldc_channel_config	cfg;
-	void				*event_arg;
-
-	const struct ldc_mode_ops	*mops;
-
-	struct ldc_iommu		iommu;
-
-	struct ldc_version		ver;
-
-	u8				hs_state;
-#define LDC_HS_CLOSED			0x00
-#define LDC_HS_OPEN			0x01
-#define LDC_HS_GOTVERS			0x02
-#define LDC_HS_SENTRTR			0x03
-#define LDC_HS_GOTRTR			0x04
-#define LDC_HS_COMPLETE			0x10
-
-	u8				flags;
-#define LDC_FLAG_ALLOCED_QUEUES		0x01
-#define LDC_FLAG_REGISTERED_QUEUES	0x02
-#define LDC_FLAG_REGISTERED_IRQS	0x04
-#define LDC_FLAG_RESET			0x10
-
-	u8				mss;
-	u8				state;
-
-#define LDC_IRQ_NAME_MAX		32
-	char				rx_irq_name[LDC_IRQ_NAME_MAX];
-	char				tx_irq_name[LDC_IRQ_NAME_MAX];
-
-	struct hlist_head		mh_list;
-
-	struct hlist_node		list;
-};
-
-#define ldcdbg(TYPE, f, a...) \
-do {	if (lp->cfg.debug & LDC_DEBUG_##TYPE) \
-		printk(KERN_INFO PFX "ID[%lu] " f, lp->id, ## a); \
-} while (0)
-
-static const char *state_to_str(u8 state)
-{
-	switch (state) {
-	case LDC_STATE_INVALID:
-		return "INVALID";
-	case LDC_STATE_INIT:
-		return "INIT";
-	case LDC_STATE_BOUND:
-		return "BOUND";
-	case LDC_STATE_READY:
-		return "READY";
-	case LDC_STATE_CONNECTED:
-		return "CONNECTED";
-	default:
-		return "<UNKNOWN>";
-	}
-}
-
-static void ldc_set_state(struct ldc_channel *lp, u8 state)
-{
-	ldcdbg(STATE, "STATE (%s) --> (%s)\n",
-	       state_to_str(lp->state),
-	       state_to_str(state));
-
-	lp->state = state;
-}
-
-static unsigned long __advance(unsigned long off, unsigned long num_entries)
-{
-	off += LDC_PACKET_SIZE;
-	if (off == (num_entries * LDC_PACKET_SIZE))
-		off = 0;
-
-	return off;
-}
-
-static unsigned long rx_advance(struct ldc_channel *lp, unsigned long off)
-{
-	return __advance(off, lp->rx_num_entries);
-}
-
-static unsigned long tx_advance(struct ldc_channel *lp, unsigned long off)
-{
-	return __advance(off, lp->tx_num_entries);
-}
-
-static struct ldc_packet *handshake_get_tx_packet(struct ldc_channel *lp,
-						  unsigned long *new_tail)
-{
-	struct ldc_packet *p;
-	unsigned long t;
-
-	t = tx_advance(lp, lp->tx_tail);
-	if (t == lp->tx_head)
-		return NULL;
-
-	*new_tail = t;
-
-	p = lp->tx_base;
-	return p + (lp->tx_tail / LDC_PACKET_SIZE);
-}
-
-/* When we are in reliable or stream mode, have to track the next packet
- * we haven't gotten an ACK for in the TX queue using tx_acked.  We have
- * to be careful not to stomp over the queue past that point.  During
- * the handshake, we don't have TX data packets pending in the queue
- * and that's why handshake_get_tx_packet() need not be mindful of
- * lp->tx_acked.
- */
-static unsigned long head_for_data(struct ldc_channel *lp)
-{
-	if (lp->cfg.mode == LDC_MODE_STREAM)
-		return lp->tx_acked;
-	return lp->tx_head;
-}
-
-static int tx_has_space_for(struct ldc_channel *lp, unsigned int size)
-{
-	unsigned long limit, tail, new_tail, diff;
-	unsigned int mss;
-
-	limit = head_for_data(lp);
-	tail = lp->tx_tail;
-	new_tail = tx_advance(lp, tail);
-	if (new_tail == limit)
-		return 0;
-
-	if (limit > new_tail)
-		diff = limit - new_tail;
-	else
-		diff = (limit +
-			((lp->tx_num_entries * LDC_PACKET_SIZE) - new_tail));
-	diff /= LDC_PACKET_SIZE;
-	mss = lp->mss;
-
-	if (diff * mss < size)
-		return 0;
-
-	return 1;
-}
-
-static struct ldc_packet *data_get_tx_packet(struct ldc_channel *lp,
-					     unsigned long *new_tail)
-{
-	struct ldc_packet *p;
-	unsigned long h, t;
-
-	h = head_for_data(lp);
-	t = tx_advance(lp, lp->tx_tail);
-	if (t == h)
-		return NULL;
-
-	*new_tail = t;
-
-	p = lp->tx_base;
-	return p + (lp->tx_tail / LDC_PACKET_SIZE);
-}
-
-static int set_tx_tail(struct ldc_channel *lp, unsigned long tail)
-{
-	unsigned long orig_tail = lp->tx_tail;
-	int limit = 1000;
-
-	lp->tx_tail = tail;
-	while (limit-- > 0) {
-		unsigned long err;
-
-		err = sun4v_ldc_tx_set_qtail(lp->id, tail);
-		if (!err)
-			return 0;
-
-		if (err != HV_EWOULDBLOCK) {
-			lp->tx_tail = orig_tail;
-			return -EINVAL;
-		}
-		udelay(1);
-	}
-
-	lp->tx_tail = orig_tail;
-	return -EBUSY;
-}
-
-/* This just updates the head value in the hypervisor using
- * a polling loop with a timeout.  The caller takes care of
- * upating software state representing the head change, if any.
- */
-static int __set_rx_head(struct ldc_channel *lp, unsigned long head)
-{
-	int limit = 1000;
-
-	while (limit-- > 0) {
-		unsigned long err;
-
-		err = sun4v_ldc_rx_set_qhead(lp->id, head);
-		if (!err)
-			return 0;
-
-		if (err != HV_EWOULDBLOCK)
-			return -EINVAL;
-
-		udelay(1);
-	}
-
-	return -EBUSY;
-}
-
-static int send_tx_packet(struct ldc_channel *lp,
-			  struct ldc_packet *p,
-			  unsigned long new_tail)
-{
-	BUG_ON(p != (lp->tx_base + (lp->tx_tail / LDC_PACKET_SIZE)));
-
-	return set_tx_tail(lp, new_tail);
-}
-
-static struct ldc_packet *handshake_compose_ctrl(struct ldc_channel *lp,
-						 u8 stype, u8 ctrl,
-						 void *data, int dlen,
-						 unsigned long *new_tail)
-{
-	struct ldc_packet *p = handshake_get_tx_packet(lp, new_tail);
-
-	if (p) {
-		memset(p, 0, sizeof(*p));
-		p->type = LDC_CTRL;
-		p->stype = stype;
-		p->ctrl = ctrl;
-		if (data)
-			memcpy(p->u.u_data, data, dlen);
-	}
-	return p;
-}
-
-static int start_handshake(struct ldc_channel *lp)
-{
-	struct ldc_packet *p;
-	struct ldc_version *ver;
-	unsigned long new_tail;
-
-	ver = &ver_arr[0];
-
-	ldcdbg(HS, "SEND VER INFO maj[%u] min[%u]\n",
-	       ver->major, ver->minor);
-
-	p = handshake_compose_ctrl(lp, LDC_INFO, LDC_VERS,
-				   ver, sizeof(*ver), &new_tail);
-	if (p) {
-		int err = send_tx_packet(lp, p, new_tail);
-		if (!err)
-			lp->flags &= ~LDC_FLAG_RESET;
-		return err;
-	}
-	return -EBUSY;
-}
-
-static int send_version_nack(struct ldc_channel *lp,
-			     u16 major, u16 minor)
-{
-	struct ldc_packet *p;
-	struct ldc_version ver;
-	unsigned long new_tail;
-
-	ver.major = major;
-	ver.minor = minor;
-
-	p = handshake_compose_ctrl(lp, LDC_NACK, LDC_VERS,
-				   &ver, sizeof(ver), &new_tail);
-	if (p) {
-		ldcdbg(HS, "SEND VER NACK maj[%u] min[%u]\n",
-		       ver.major, ver.minor);
-
-		return send_tx_packet(lp, p, new_tail);
-	}
-	return -EBUSY;
-}
-
-static int send_version_ack(struct ldc_channel *lp,
-			    struct ldc_version *vp)
-{
-	struct ldc_packet *p;
-	unsigned long new_tail;
-
-	p = handshake_compose_ctrl(lp, LDC_ACK, LDC_VERS,
-				   vp, sizeof(*vp), &new_tail);
-	if (p) {
-		ldcdbg(HS, "SEND VER ACK maj[%u] min[%u]\n",
-		       vp->major, vp->minor);
-
-		return send_tx_packet(lp, p, new_tail);
-	}
-	return -EBUSY;
-}
-
-static int send_rts(struct ldc_channel *lp)
-{
-	struct ldc_packet *p;
-	unsigned long new_tail;
-
-	p = handshake_compose_ctrl(lp, LDC_INFO, LDC_RTS, NULL, 0,
-				   &new_tail);
-	if (p) {
-		p->env = lp->cfg.mode;
-		p->seqid = 0;
-		lp->rcv_nxt = 0;
-
-		ldcdbg(HS, "SEND RTS env[0x%x] seqid[0x%x]\n",
-		       p->env, p->seqid);
-
-		return send_tx_packet(lp, p, new_tail);
-	}
-	return -EBUSY;
-}
-
-static int send_rtr(struct ldc_channel *lp)
-{
-	struct ldc_packet *p;
-	unsigned long new_tail;
-
-	p = handshake_compose_ctrl(lp, LDC_INFO, LDC_RTR, NULL, 0,
-				   &new_tail);
-	if (p) {
-		p->env = lp->cfg.mode;
-		p->seqid = 0;
-
-		ldcdbg(HS, "SEND RTR env[0x%x] seqid[0x%x]\n",
-		       p->env, p->seqid);
-
-		return send_tx_packet(lp, p, new_tail);
-	}
-	return -EBUSY;
-}
-
-static int send_rdx(struct ldc_channel *lp)
-{
-	struct ldc_packet *p;
-	unsigned long new_tail;
-
-	p = handshake_compose_ctrl(lp, LDC_INFO, LDC_RDX, NULL, 0,
-				   &new_tail);
-	if (p) {
-		p->env = 0;
-		p->seqid = ++lp->snd_nxt;
-		p->u.r.ackid = lp->rcv_nxt;
-
-		ldcdbg(HS, "SEND RDX env[0x%x] seqid[0x%x] ackid[0x%x]\n",
-		       p->env, p->seqid, p->u.r.ackid);
-
-		return send_tx_packet(lp, p, new_tail);
-	}
-	return -EBUSY;
-}
-
-static int send_data_nack(struct ldc_channel *lp, struct ldc_packet *data_pkt)
-{
-	struct ldc_packet *p;
-	unsigned long new_tail;
-	int err;
-
-	p = data_get_tx_packet(lp, &new_tail);
-	if (!p)
-		return -EBUSY;
-	memset(p, 0, sizeof(*p));
-	p->type = data_pkt->type;
-	p->stype = LDC_NACK;
-	p->ctrl = data_pkt->ctrl & LDC_CTRL_MSK;
-	p->seqid = lp->snd_nxt + 1;
-	p->u.r.ackid = lp->rcv_nxt;
-
-	ldcdbg(HS, "SEND DATA NACK type[0x%x] ctl[0x%x] seq[0x%x] ack[0x%x]\n",
-	       p->type, p->ctrl, p->seqid, p->u.r.ackid);
-
-	err = send_tx_packet(lp, p, new_tail);
-	if (!err)
-		lp->snd_nxt++;
-
-	return err;
-}
-
-static int ldc_abort(struct ldc_channel *lp)
-{
-	unsigned long hv_err;
-
-	ldcdbg(STATE, "ABORT\n");
-
-	/* We report but do not act upon the hypervisor errors because
-	 * there really isn't much we can do if they fail at this point.
-	 */
-	hv_err = sun4v_ldc_tx_qconf(lp->id, lp->tx_ra, lp->tx_num_entries);
-	if (hv_err)
-		printk(KERN_ERR PFX "ldc_abort: "
-		       "sun4v_ldc_tx_qconf(%lx,%lx,%lx) failed, err=%lu\n",
-		       lp->id, lp->tx_ra, lp->tx_num_entries, hv_err);
-
-	hv_err = sun4v_ldc_tx_get_state(lp->id,
-					&lp->tx_head,
-					&lp->tx_tail,
-					&lp->chan_state);
-	if (hv_err)
-		printk(KERN_ERR PFX "ldc_abort: "
-		       "sun4v_ldc_tx_get_state(%lx,...) failed, err=%lu\n",
-		       lp->id, hv_err);
-
-	hv_err = sun4v_ldc_rx_qconf(lp->id, lp->rx_ra, lp->rx_num_entries);
-	if (hv_err)
-		printk(KERN_ERR PFX "ldc_abort: "
-		       "sun4v_ldc_rx_qconf(%lx,%lx,%lx) failed, err=%lu\n",
-		       lp->id, lp->rx_ra, lp->rx_num_entries, hv_err);
-
-	/* Refetch the RX queue state as well, because we could be invoked
-	 * here in the queue processing context.
-	 */
-	hv_err = sun4v_ldc_rx_get_state(lp->id,
-					&lp->rx_head,
-					&lp->rx_tail,
-					&lp->chan_state);
-	if (hv_err)
-		printk(KERN_ERR PFX "ldc_abort: "
-		       "sun4v_ldc_rx_get_state(%lx,...) failed, err=%lu\n",
-		       lp->id, hv_err);
-
-	return -ECONNRESET;
-}
-
-static struct ldc_version *find_by_major(u16 major)
-{
-	struct ldc_version *ret = NULL;
-	int i;
-
-	for (i = 0; i < ARRAY_SIZE(ver_arr); i++) {
-		struct ldc_version *v = &ver_arr[i];
-		if (v->major <= major) {
-			ret = v;
-			break;
-		}
-	}
-	return ret;
-}
-
-static int process_ver_info(struct ldc_channel *lp, struct ldc_version *vp)
-{
-	struct ldc_version *vap;
-	int err;
-
-	ldcdbg(HS, "GOT VERSION INFO major[%x] minor[%x]\n",
-	       vp->major, vp->minor);
-
-	if (lp->hs_state == LDC_HS_GOTVERS) {
-		lp->hs_state = LDC_HS_OPEN;
-		memset(&lp->ver, 0, sizeof(lp->ver));
-	}
-
-	vap = find_by_major(vp->major);
-	if (!vap) {
-		err = send_version_nack(lp, 0, 0);
-	} else if (vap->major != vp->major) {
-		err = send_version_nack(lp, vap->major, vap->minor);
-	} else {
-		struct ldc_version ver = *vp;
-		if (ver.minor > vap->minor)
-			ver.minor = vap->minor;
-		err = send_version_ack(lp, &ver);
-		if (!err) {
-			lp->ver = ver;
-			lp->hs_state = LDC_HS_GOTVERS;
-		}
-	}
-	if (err)
-		return ldc_abort(lp);
-
-	return 0;
-}
-
-static int process_ver_ack(struct ldc_channel *lp, struct ldc_version *vp)
-{
-	ldcdbg(HS, "GOT VERSION ACK major[%x] minor[%x]\n",
-	       vp->major, vp->minor);
-
-	if (lp->hs_state == LDC_HS_GOTVERS) {
-		if (lp->ver.major != vp->major ||
-		    lp->ver.minor != vp->minor)
-			return ldc_abort(lp);
-	} else {
-		lp->ver = *vp;
-		lp->hs_state = LDC_HS_GOTVERS;
-	}
-	if (send_rts(lp))
-		return ldc_abort(lp);
-	return 0;
-}
-
-static int process_ver_nack(struct ldc_channel *lp, struct ldc_version *vp)
-{
-	struct ldc_version *vap;
-
-	if ((vp->major == 0 && vp->minor == 0) ||
-	    !(vap = find_by_major(vp->major))) {
-		return ldc_abort(lp);
-	} else {
-		struct ldc_packet *p;
-		unsigned long new_tail;
-
-		p = handshake_compose_ctrl(lp, LDC_INFO, LDC_VERS,
-					   vap, sizeof(*vap),
-					   &new_tail);
-		if (p)
-			return send_tx_packet(lp, p, new_tail);
-		else
-			return ldc_abort(lp);
-	}
-}
-
-static int process_version(struct ldc_channel *lp,
-			   struct ldc_packet *p)
-{
-	struct ldc_version *vp;
-
-	vp = (struct ldc_version *) p->u.u_data;
-
-	switch (p->stype) {
-	case LDC_INFO:
-		return process_ver_info(lp, vp);
-
-	case LDC_ACK:
-		return process_ver_ack(lp, vp);
-
-	case LDC_NACK:
-		return process_ver_nack(lp, vp);
-
-	default:
-		return ldc_abort(lp);
-	}
-}
-
-static int process_rts(struct ldc_channel *lp,
-		       struct ldc_packet *p)
-{
-	ldcdbg(HS, "GOT RTS stype[%x] seqid[%x] env[%x]\n",
-	       p->stype, p->seqid, p->env);
-
-	if (p->stype     != LDC_INFO	   ||
-	    lp->hs_state != LDC_HS_GOTVERS ||
-	    p->env       != lp->cfg.mode)
-		return ldc_abort(lp);
-
-	lp->snd_nxt = p->seqid;
-	lp->rcv_nxt = p->seqid;
-	lp->hs_state = LDC_HS_SENTRTR;
-	if (send_rtr(lp))
-		return ldc_abort(lp);
-
-	return 0;
-}
-
-static int process_rtr(struct ldc_channel *lp,
-		       struct ldc_packet *p)
-{
-	ldcdbg(HS, "GOT RTR stype[%x] seqid[%x] env[%x]\n",
-	       p->stype, p->seqid, p->env);
-
-	if (p->stype     != LDC_INFO ||
-	    p->env       != lp->cfg.mode)
-		return ldc_abort(lp);
-
-	lp->snd_nxt = p->seqid;
-	lp->hs_state = LDC_HS_COMPLETE;
-	ldc_set_state(lp, LDC_STATE_CONNECTED);
-	send_rdx(lp);
-
-	return LDC_EVENT_UP;
-}
-
-static int rx_seq_ok(struct ldc_channel *lp, u32 seqid)
-{
-	return lp->rcv_nxt + 1 == seqid;
-}
-
-static int process_rdx(struct ldc_channel *lp,
-		       struct ldc_packet *p)
-{
-	ldcdbg(HS, "GOT RDX stype[%x] seqid[%x] env[%x] ackid[%x]\n",
-	       p->stype, p->seqid, p->env, p->u.r.ackid);
-
-	if (p->stype != LDC_INFO ||
-	    !(rx_seq_ok(lp, p->seqid)))
-		return ldc_abort(lp);
-
-	lp->rcv_nxt = p->seqid;
-
-	lp->hs_state = LDC_HS_COMPLETE;
-	ldc_set_state(lp, LDC_STATE_CONNECTED);
-
-	return LDC_EVENT_UP;
-}
-
-static int process_control_frame(struct ldc_channel *lp,
-				 struct ldc_packet *p)
-{
-	switch (p->ctrl) {
-	case LDC_VERS:
-		return process_version(lp, p);
-
-	case LDC_RTS:
-		return process_rts(lp, p);
-
-	case LDC_RTR:
-		return process_rtr(lp, p);
-
-	case LDC_RDX:
-		return process_rdx(lp, p);
-
-	default:
-		return ldc_abort(lp);
-	}
-}
-
-static int process_error_frame(struct ldc_channel *lp,
-			       struct ldc_packet *p)
-{
-	return ldc_abort(lp);
-}
-
-static int process_data_ack(struct ldc_channel *lp,
-			    struct ldc_packet *ack)
-{
-	unsigned long head = lp->tx_acked;
-	u32 ackid = ack->u.r.ackid;
-
-	while (1) {
-		struct ldc_packet *p = lp->tx_base + (head / LDC_PACKET_SIZE);
-
-		head = tx_advance(lp, head);
-
-		if (p->seqid == ackid) {
-			lp->tx_acked = head;
-			return 0;
-		}
-		if (head == lp->tx_tail)
-			return ldc_abort(lp);
-	}
-
-	return 0;
-}
-
-static void send_events(struct ldc_channel *lp, unsigned int event_mask)
-{
-	if (event_mask & LDC_EVENT_RESET)
-		lp->cfg.event(lp->event_arg, LDC_EVENT_RESET);
-	if (event_mask & LDC_EVENT_UP)
-		lp->cfg.event(lp->event_arg, LDC_EVENT_UP);
-	if (event_mask & LDC_EVENT_DATA_READY)
-		lp->cfg.event(lp->event_arg, LDC_EVENT_DATA_READY);
-}
-
-static irqreturn_t ldc_rx(int irq, void *dev_id)
-{
-	struct ldc_channel *lp = dev_id;
-	unsigned long orig_state, hv_err, flags;
-	unsigned int event_mask;
-
-	spin_lock_irqsave(&lp->lock, flags);
-
-	orig_state = lp->chan_state;
-	hv_err = sun4v_ldc_rx_get_state(lp->id,
-					&lp->rx_head,
-					&lp->rx_tail,
-					&lp->chan_state);
-
-	ldcdbg(RX, "RX state[0x%02lx:0x%02lx] head[0x%04lx] tail[0x%04lx]\n",
-	       orig_state, lp->chan_state, lp->rx_head, lp->rx_tail);
-
-	event_mask = 0;
-
-	if (lp->cfg.mode == LDC_MODE_RAW &&
-	    lp->chan_state == LDC_CHANNEL_UP) {
-		lp->hs_state = LDC_HS_COMPLETE;
-		ldc_set_state(lp, LDC_STATE_CONNECTED);
-
-		event_mask |= LDC_EVENT_UP;
-
-		orig_state = lp->chan_state;
-	}
-
-	/* If we are in reset state, flush the RX queue and ignore
-	 * everything.
-	 */
-	if (lp->flags & LDC_FLAG_RESET) {
-		(void) __set_rx_head(lp, lp->rx_tail);
-		goto out;
-	}
-
-	/* Once we finish the handshake, we let the ldc_read()
-	 * paths do all of the control frame and state management.
-	 * Just trigger the callback.
-	 */
-	if (lp->hs_state == LDC_HS_COMPLETE) {
-handshake_complete:
-		if (lp->chan_state != orig_state) {
-			unsigned int event = LDC_EVENT_RESET;
-
-			if (lp->chan_state == LDC_CHANNEL_UP)
-				event = LDC_EVENT_UP;
-
-			event_mask |= event;
-		}
-		if (lp->rx_head != lp->rx_tail)
-			event_mask |= LDC_EVENT_DATA_READY;
-
-		goto out;
-	}
-
-	if (lp->chan_state != orig_state)
-		goto out;
-
-	while (lp->rx_head != lp->rx_tail) {
-		struct ldc_packet *p;
-		unsigned long new;
-		int err;
-
-		p = lp->rx_base + (lp->rx_head / LDC_PACKET_SIZE);
-
-		switch (p->type) {
-		case LDC_CTRL:
-			err = process_control_frame(lp, p);
-			if (err > 0)
-				event_mask |= err;
-			break;
-
-		case LDC_DATA:
-			event_mask |= LDC_EVENT_DATA_READY;
-			err = 0;
-			break;
-
-		case LDC_ERR:
-			err = process_error_frame(lp, p);
-			break;
-
-		default:
-			err = ldc_abort(lp);
-			break;
-		}
-
-		if (err < 0)
-			break;
-
-		new = lp->rx_head;
-		new += LDC_PACKET_SIZE;
-		if (new == (lp->rx_num_entries * LDC_PACKET_SIZE))
-			new = 0;
-		lp->rx_head = new;
-
-		err = __set_rx_head(lp, new);
-		if (err < 0) {
-			(void) ldc_abort(lp);
-			break;
-		}
-		if (lp->hs_state == LDC_HS_COMPLETE)
-			goto handshake_complete;
-	}
-
-out:
-	spin_unlock_irqrestore(&lp->lock, flags);
-
-	send_events(lp, event_mask);
-
-	return IRQ_HANDLED;
-}
-
-static irqreturn_t ldc_tx(int irq, void *dev_id)
-{
-	struct ldc_channel *lp = dev_id;
-	unsigned long flags, hv_err, orig_state;
-	unsigned int event_mask = 0;
-
-	spin_lock_irqsave(&lp->lock, flags);
-
-	orig_state = lp->chan_state;
-	hv_err = sun4v_ldc_tx_get_state(lp->id,
-					&lp->tx_head,
-					&lp->tx_tail,
-					&lp->chan_state);
-
-	ldcdbg(TX, " TX state[0x%02lx:0x%02lx] head[0x%04lx] tail[0x%04lx]\n",
-	       orig_state, lp->chan_state, lp->tx_head, lp->tx_tail);
-
-	if (lp->cfg.mode == LDC_MODE_RAW &&
-	    lp->chan_state == LDC_CHANNEL_UP) {
-		lp->hs_state = LDC_HS_COMPLETE;
-		ldc_set_state(lp, LDC_STATE_CONNECTED);
-
-		event_mask |= LDC_EVENT_UP;
-	}
-
-	spin_unlock_irqrestore(&lp->lock, flags);
-
-	send_events(lp, event_mask);
-
-	return IRQ_HANDLED;
-}
-
-/* XXX ldc_alloc() and ldc_free() needs to run under a mutex so
- * XXX that addition and removal from the ldc_channel_list has
- * XXX atomicity, otherwise the __ldc_channel_exists() check is
- * XXX totally pointless as another thread can slip into ldc_alloc()
- * XXX and add a channel with the same ID.  There also needs to be
- * XXX a spinlock for ldc_channel_list.
- */
-static HLIST_HEAD(ldc_channel_list);
-
-static int __ldc_channel_exists(unsigned long id)
-{
-	struct ldc_channel *lp;
-	struct hlist_node *n;
-
-	hlist_for_each_entry(lp, n, &ldc_channel_list, list) {
-		if (lp->id == id)
-			return 1;
-	}
-	return 0;
-}
-
-static int alloc_queue(const char *name, unsigned long num_entries,
-		       struct ldc_packet **base, unsigned long *ra)
-{
-	unsigned long size, order;
-	void *q;
-
-	size = num_entries * LDC_PACKET_SIZE;
-	order = get_order(size);
-
-	q = (void *) __get_free_pages(GFP_KERNEL, order);
-	if (!q) {
-		printk(KERN_ERR PFX "Alloc of %s queue failed with "
-		       "size=%lu order=%lu\n", name, size, order);
-		return -ENOMEM;
-	}
-
-	memset(q, 0, PAGE_SIZE << order);
-
-	*base = q;
-	*ra = __pa(q);
-
-	return 0;
-}
-
-static void free_queue(unsigned long num_entries, struct ldc_packet *q)
-{
-	unsigned long size, order;
-
-	if (!q)
-		return;
-
-	size = num_entries * LDC_PACKET_SIZE;
-	order = get_order(size);
-
-	free_pages((unsigned long)q, order);
-}
-
-/* XXX Make this configurable... XXX */
-#define LDC_IOTABLE_SIZE	(8 * 1024)
-
-static int ldc_iommu_init(struct ldc_channel *lp)
-{
-	unsigned long sz, num_tsb_entries, tsbsize, order;
-	struct ldc_iommu *iommu = &lp->iommu;
-	struct ldc_mtable_entry *table;
-	unsigned long hv_err;
-	int err;
-
-	num_tsb_entries = LDC_IOTABLE_SIZE;
-	tsbsize = num_tsb_entries * sizeof(struct ldc_mtable_entry);
-
-	spin_lock_init(&iommu->lock);
-
-	sz = num_tsb_entries / 8;
-	sz = (sz + 7UL) & ~7UL;
-	iommu->arena.map = kzalloc(sz, GFP_KERNEL);
-	if (!iommu->arena.map) {
-		printk(KERN_ERR PFX "Alloc of arena map failed, sz=%lu\n", sz);
-		return -ENOMEM;
-	}
-
-	iommu->arena.limit = num_tsb_entries;
-
-	order = get_order(tsbsize);
-
-	table = (struct ldc_mtable_entry *)
-		__get_free_pages(GFP_KERNEL, order);
-	err = -ENOMEM;
-	if (!table) {
-		printk(KERN_ERR PFX "Alloc of MTE table failed, "
-		       "size=%lu order=%lu\n", tsbsize, order);
-		goto out_free_map;
-	}
-
-	memset(table, 0, PAGE_SIZE << order);
-
-	iommu->page_table = table;
-
-	hv_err = sun4v_ldc_set_map_table(lp->id, __pa(table),
-					 num_tsb_entries);
-	err = -EINVAL;
-	if (hv_err)
-		goto out_free_table;
-
-	return 0;
-
-out_free_table:
-	free_pages((unsigned long) table, order);
-	iommu->page_table = NULL;
-
-out_free_map:
-	kfree(iommu->arena.map);
-	iommu->arena.map = NULL;
-
-	return err;
-}
-
-static void ldc_iommu_release(struct ldc_channel *lp)
-{
-	struct ldc_iommu *iommu = &lp->iommu;
-	unsigned long num_tsb_entries, tsbsize, order;
-
-	(void) sun4v_ldc_set_map_table(lp->id, 0, 0);
-
-	num_tsb_entries = iommu->arena.limit;
-	tsbsize = num_tsb_entries * sizeof(struct ldc_mtable_entry);
-	order = get_order(tsbsize);
-
-	free_pages((unsigned long) iommu->page_table, order);
-	iommu->page_table = NULL;
-
-	kfree(iommu->arena.map);
-	iommu->arena.map = NULL;
-}
-
-struct ldc_channel *ldc_alloc(unsigned long id,
-			      const struct ldc_channel_config *cfgp,
-			      void *event_arg)
-{
-	struct ldc_channel *lp;
-	const struct ldc_mode_ops *mops;
-	unsigned long dummy1, dummy2, hv_err;
-	u8 mss, *mssbuf;
-	int err;
-
-	err = -ENODEV;
-	if (!ldom_domaining_enabled)
-		goto out_err;
-
-	err = -EINVAL;
-	if (!cfgp)
-		goto out_err;
-
-	switch (cfgp->mode) {
-	case LDC_MODE_RAW:
-		mops = &raw_ops;
-		mss = LDC_PACKET_SIZE;
-		break;
-
-	case LDC_MODE_UNRELIABLE:
-		mops = &nonraw_ops;
-		mss = LDC_PACKET_SIZE - 8;
-		break;
-
-	case LDC_MODE_STREAM:
-		mops = &stream_ops;
-		mss = LDC_PACKET_SIZE - 8 - 8;
-		break;
-
-	default:
-		goto out_err;
-	}
-
-	if (!cfgp->event || !event_arg || !cfgp->rx_irq || !cfgp->tx_irq)
-		goto out_err;
-
-	hv_err = sun4v_ldc_tx_qinfo(id, &dummy1, &dummy2);
-	err = -ENODEV;
-	if (hv_err == HV_ECHANNEL)
-		goto out_err;
-
-	err = -EEXIST;
-	if (__ldc_channel_exists(id))
-		goto out_err;
-
-	mssbuf = NULL;
-
-	lp = kzalloc(sizeof(*lp), GFP_KERNEL);
-	err = -ENOMEM;
-	if (!lp)
-		goto out_err;
-
-	spin_lock_init(&lp->lock);
-
-	lp->id = id;
-
-	err = ldc_iommu_init(lp);
-	if (err)
-		goto out_free_ldc;
-
-	lp->mops = mops;
-	lp->mss = mss;
-
-	lp->cfg = *cfgp;
-	if (!lp->cfg.mtu)
-		lp->cfg.mtu = LDC_DEFAULT_MTU;
-
-	if (lp->cfg.mode == LDC_MODE_STREAM) {
-		mssbuf = kzalloc(lp->cfg.mtu, GFP_KERNEL);
-		if (!mssbuf) {
-			err = -ENOMEM;
-			goto out_free_iommu;
-		}
-		lp->mssbuf = mssbuf;
-	}
-
-	lp->event_arg = event_arg;
-
-	/* XXX allow setting via ldc_channel_config to override defaults
-	 * XXX or use some formula based upon mtu
-	 */
-	lp->tx_num_entries = LDC_DEFAULT_NUM_ENTRIES;
-	lp->rx_num_entries = LDC_DEFAULT_NUM_ENTRIES;
-
-	err = alloc_queue("TX", lp->tx_num_entries,
-			  &lp->tx_base, &lp->tx_ra);
-	if (err)
-		goto out_free_mssbuf;
-
-	err = alloc_queue("RX", lp->rx_num_entries,
-			  &lp->rx_base, &lp->rx_ra);
-	if (err)
-		goto out_free_txq;
-
-	lp->flags |= LDC_FLAG_ALLOCED_QUEUES;
-
-	lp->hs_state = LDC_HS_CLOSED;
-	ldc_set_state(lp, LDC_STATE_INIT);
-
-	INIT_HLIST_NODE(&lp->list);
-	hlist_add_head(&lp->list, &ldc_channel_list);
-
-	INIT_HLIST_HEAD(&lp->mh_list);
-
-	return lp;
-
-out_free_txq:
-	free_queue(lp->tx_num_entries, lp->tx_base);
-
-out_free_mssbuf:
-	if (mssbuf)
-		kfree(mssbuf);
-
-out_free_iommu:
-	ldc_iommu_release(lp);
-
-out_free_ldc:
-	kfree(lp);
-
-out_err:
-	return ERR_PTR(err);
-}
-EXPORT_SYMBOL(ldc_alloc);
-
-void ldc_free(struct ldc_channel *lp)
-{
-	if (lp->flags & LDC_FLAG_REGISTERED_IRQS) {
-		free_irq(lp->cfg.rx_irq, lp);
-		free_irq(lp->cfg.tx_irq, lp);
-	}
-
-	if (lp->flags & LDC_FLAG_REGISTERED_QUEUES) {
-		sun4v_ldc_tx_qconf(lp->id, 0, 0);
-		sun4v_ldc_rx_qconf(lp->id, 0, 0);
-		lp->flags &= ~LDC_FLAG_REGISTERED_QUEUES;
-	}
-	if (lp->flags & LDC_FLAG_ALLOCED_QUEUES) {
-		free_queue(lp->tx_num_entries, lp->tx_base);
-		free_queue(lp->rx_num_entries, lp->rx_base);
-		lp->flags &= ~LDC_FLAG_ALLOCED_QUEUES;
-	}
-
-	hlist_del(&lp->list);
-
-	if (lp->mssbuf)
-		kfree(lp->mssbuf);
-
-	ldc_iommu_release(lp);
-
-	kfree(lp);
-}
-EXPORT_SYMBOL(ldc_free);
-
-/* Bind the channel.  This registers the LDC queues with
- * the hypervisor and puts the channel into a pseudo-listening
- * state.  This does not initiate a handshake, ldc_connect() does
- * that.
- */
-int ldc_bind(struct ldc_channel *lp, const char *name)
-{
-	unsigned long hv_err, flags;
-	int err = -EINVAL;
-
-	if (!name ||
-	    (lp->state != LDC_STATE_INIT))
-		return -EINVAL;
-
-	snprintf(lp->rx_irq_name, LDC_IRQ_NAME_MAX, "%s RX", name);
-	snprintf(lp->tx_irq_name, LDC_IRQ_NAME_MAX, "%s TX", name);
-
-	err = request_irq(lp->cfg.rx_irq, ldc_rx,
-			  IRQF_SAMPLE_RANDOM | IRQF_SHARED,
-			  lp->rx_irq_name, lp);
-	if (err)
-		return err;
-
-	err = request_irq(lp->cfg.tx_irq, ldc_tx,
-			  IRQF_SAMPLE_RANDOM | IRQF_SHARED,
-			  lp->tx_irq_name, lp);
-	if (err) {
-		free_irq(lp->cfg.rx_irq, lp);
-		return err;
-	}
-
-
-	spin_lock_irqsave(&lp->lock, flags);
-
-	enable_irq(lp->cfg.rx_irq);
-	enable_irq(lp->cfg.tx_irq);
-
-	lp->flags |= LDC_FLAG_REGISTERED_IRQS;
-
-	err = -ENODEV;
-	hv_err = sun4v_ldc_tx_qconf(lp->id, 0, 0);
-	if (hv_err)
-		goto out_free_irqs;
-
-	hv_err = sun4v_ldc_tx_qconf(lp->id, lp->tx_ra, lp->tx_num_entries);
-	if (hv_err)
-		goto out_free_irqs;
-
-	hv_err = sun4v_ldc_rx_qconf(lp->id, 0, 0);
-	if (hv_err)
-		goto out_unmap_tx;
-
-	hv_err = sun4v_ldc_rx_qconf(lp->id, lp->rx_ra, lp->rx_num_entries);
-	if (hv_err)
-		goto out_unmap_tx;
-
-	lp->flags |= LDC_FLAG_REGISTERED_QUEUES;
-
-	hv_err = sun4v_ldc_tx_get_state(lp->id,
-					&lp->tx_head,
-					&lp->tx_tail,
-					&lp->chan_state);
-	err = -EBUSY;
-	if (hv_err)
-		goto out_unmap_rx;
-
-	lp->tx_acked = lp->tx_head;
-
-	lp->hs_state = LDC_HS_OPEN;
-	ldc_set_state(lp, LDC_STATE_BOUND);
-
-	spin_unlock_irqrestore(&lp->lock, flags);
-
-	return 0;
-
-out_unmap_rx:
-	lp->flags &= ~LDC_FLAG_REGISTERED_QUEUES;
-	sun4v_ldc_rx_qconf(lp->id, 0, 0);
-
-out_unmap_tx:
-	sun4v_ldc_tx_qconf(lp->id, 0, 0);
-
-out_free_irqs:
-	lp->flags &= ~LDC_FLAG_REGISTERED_IRQS;
-	free_irq(lp->cfg.tx_irq, lp);
-	free_irq(lp->cfg.rx_irq, lp);
-
-	spin_unlock_irqrestore(&lp->lock, flags);
-
-	return err;
-}
-EXPORT_SYMBOL(ldc_bind);
-
-int ldc_connect(struct ldc_channel *lp)
-{
-	unsigned long flags;
-	int err;
-
-	if (lp->cfg.mode == LDC_MODE_RAW)
-		return -EINVAL;
-
-	spin_lock_irqsave(&lp->lock, flags);
-
-	if (!(lp->flags & LDC_FLAG_ALLOCED_QUEUES) ||
-	    !(lp->flags & LDC_FLAG_REGISTERED_QUEUES) ||
-	    lp->hs_state != LDC_HS_OPEN)
-		err = -EINVAL;
-	else
-		err = start_handshake(lp);
-
-	spin_unlock_irqrestore(&lp->lock, flags);
-
-	return err;
-}
-EXPORT_SYMBOL(ldc_connect);
-
-int ldc_disconnect(struct ldc_channel *lp)
-{
-	unsigned long hv_err, flags;
-	int err;
-
-	if (lp->cfg.mode == LDC_MODE_RAW)
-		return -EINVAL;
-
-	if (!(lp->flags & LDC_FLAG_ALLOCED_QUEUES) ||
-	    !(lp->flags & LDC_FLAG_REGISTERED_QUEUES))
-		return -EINVAL;
-
-	spin_lock_irqsave(&lp->lock, flags);
-
-	err = -ENODEV;
-	hv_err = sun4v_ldc_tx_qconf(lp->id, 0, 0);
-	if (hv_err)
-		goto out_err;
-
-	hv_err = sun4v_ldc_tx_qconf(lp->id, lp->tx_ra, lp->tx_num_entries);
-	if (hv_err)
-		goto out_err;
-
-	hv_err = sun4v_ldc_rx_qconf(lp->id, 0, 0);
-	if (hv_err)
-		goto out_err;
-
-	hv_err = sun4v_ldc_rx_qconf(lp->id, lp->rx_ra, lp->rx_num_entries);
-	if (hv_err)
-		goto out_err;
-
-	ldc_set_state(lp, LDC_STATE_BOUND);
-	lp->hs_state = LDC_HS_OPEN;
-	lp->flags |= LDC_FLAG_RESET;
-
-	spin_unlock_irqrestore(&lp->lock, flags);
-
-	return 0;
-
-out_err:
-	sun4v_ldc_tx_qconf(lp->id, 0, 0);
-	sun4v_ldc_rx_qconf(lp->id, 0, 0);
-	free_irq(lp->cfg.tx_irq, lp);
-	free_irq(lp->cfg.rx_irq, lp);
-	lp->flags &= ~(LDC_FLAG_REGISTERED_IRQS |
-		       LDC_FLAG_REGISTERED_QUEUES);
-	ldc_set_state(lp, LDC_STATE_INIT);
-
-	spin_unlock_irqrestore(&lp->lock, flags);
-
-	return err;
-}
-EXPORT_SYMBOL(ldc_disconnect);
-
-int ldc_state(struct ldc_channel *lp)
-{
-	return lp->state;
-}
-EXPORT_SYMBOL(ldc_state);
-
-static int write_raw(struct ldc_channel *lp, const void *buf, unsigned int size)
-{
-	struct ldc_packet *p;
-	unsigned long new_tail;
-	int err;
-
-	if (size > LDC_PACKET_SIZE)
-		return -EMSGSIZE;
-
-	p = data_get_tx_packet(lp, &new_tail);
-	if (!p)
-		return -EAGAIN;
-
-	memcpy(p, buf, size);
-
-	err = send_tx_packet(lp, p, new_tail);
-	if (!err)
-		err = size;
-
-	return err;
-}
-
-static int read_raw(struct ldc_channel *lp, void *buf, unsigned int size)
-{
-	struct ldc_packet *p;
-	unsigned long hv_err, new;
-	int err;
-
-	if (size < LDC_PACKET_SIZE)
-		return -EINVAL;
-
-	hv_err = sun4v_ldc_rx_get_state(lp->id,
-					&lp->rx_head,
-					&lp->rx_tail,
-					&lp->chan_state);
-	if (hv_err)
-		return ldc_abort(lp);
-
-	if (lp->chan_state == LDC_CHANNEL_DOWN ||
-	    lp->chan_state == LDC_CHANNEL_RESETTING)
-		return -ECONNRESET;
-
-	if (lp->rx_head == lp->rx_tail)
-		return 0;
-
-	p = lp->rx_base + (lp->rx_head / LDC_PACKET_SIZE);
-	memcpy(buf, p, LDC_PACKET_SIZE);
-
-	new = rx_advance(lp, lp->rx_head);
-	lp->rx_head = new;
-
-	err = __set_rx_head(lp, new);
-	if (err < 0)
-		err = -ECONNRESET;
-	else
-		err = LDC_PACKET_SIZE;
-
-	return err;
-}
-
-static const struct ldc_mode_ops raw_ops = {
-	.write		=	write_raw,
-	.read		=	read_raw,
-};
-
-static int write_nonraw(struct ldc_channel *lp, const void *buf,
-			unsigned int size)
-{
-	unsigned long hv_err, tail;
-	unsigned int copied;
-	u32 seq;
-	int err;
-
-	hv_err = sun4v_ldc_tx_get_state(lp->id, &lp->tx_head, &lp->tx_tail,
-					&lp->chan_state);
-	if (unlikely(hv_err))
-		return -EBUSY;
-
-	if (unlikely(lp->chan_state != LDC_CHANNEL_UP))
-		return ldc_abort(lp);
-
-	if (!tx_has_space_for(lp, size))
-		return -EAGAIN;
-
-	seq = lp->snd_nxt;
-	copied = 0;
-	tail = lp->tx_tail;
-	while (copied < size) {
-		struct ldc_packet *p = lp->tx_base + (tail / LDC_PACKET_SIZE);
-		u8 *data = ((lp->cfg.mode == LDC_MODE_UNRELIABLE) ?
-			    p->u.u_data :
-			    p->u.r.r_data);
-		int data_len;
-
-		p->type = LDC_DATA;
-		p->stype = LDC_INFO;
-		p->ctrl = 0;
-
-		data_len = size - copied;
-		if (data_len > lp->mss)
-			data_len = lp->mss;
-
-		BUG_ON(data_len > LDC_LEN);
-
-		p->env = (data_len |
-			  (copied == 0 ? LDC_START : 0) |
-			  (data_len == size - copied ? LDC_STOP : 0));
-
-		p->seqid = ++seq;
-
-		ldcdbg(DATA, "SENT DATA [%02x:%02x:%02x:%02x:%08x]\n",
-		       p->type,
-		       p->stype,
-		       p->ctrl,
-		       p->env,
-		       p->seqid);
-
-		memcpy(data, buf, data_len);
-		buf += data_len;
-		copied += data_len;
-
-		tail = tx_advance(lp, tail);
-	}
-
-	err = set_tx_tail(lp, tail);
-	if (!err) {
-		lp->snd_nxt = seq;
-		err = size;
-	}
-
-	return err;
-}
-
-static int rx_bad_seq(struct ldc_channel *lp, struct ldc_packet *p,
-		      struct ldc_packet *first_frag)
-{
-	int err;
-
-	if (first_frag)
-		lp->rcv_nxt = first_frag->seqid - 1;
-
-	err = send_data_nack(lp, p);
-	if (err)
-		return err;
-
-	err = __set_rx_head(lp, lp->rx_tail);
-	if (err < 0)
-		return ldc_abort(lp);
-
-	return 0;
-}
-
-static int data_ack_nack(struct ldc_channel *lp, struct ldc_packet *p)
-{
-	if (p->stype & LDC_ACK) {
-		int err = process_data_ack(lp, p);
-		if (err)
-			return err;
-	}
-	if (p->stype & LDC_NACK)
-		return ldc_abort(lp);
-
-	return 0;
-}
-
-static int rx_data_wait(struct ldc_channel *lp, unsigned long cur_head)
-{
-	unsigned long dummy;
-	int limit = 1000;
-
-	ldcdbg(DATA, "DATA WAIT cur_head[%lx] rx_head[%lx] rx_tail[%lx]\n",
-	       cur_head, lp->rx_head, lp->rx_tail);
-	while (limit-- > 0) {
-		unsigned long hv_err;
-
-		hv_err = sun4v_ldc_rx_get_state(lp->id,
-						&dummy,
-						&lp->rx_tail,
-						&lp->chan_state);
-		if (hv_err)
-			return ldc_abort(lp);
-
-		if (lp->chan_state == LDC_CHANNEL_DOWN ||
-		    lp->chan_state == LDC_CHANNEL_RESETTING)
-			return -ECONNRESET;
-
-		if (cur_head != lp->rx_tail) {
-			ldcdbg(DATA, "DATA WAIT DONE "
-			       "head[%lx] tail[%lx] chan_state[%lx]\n",
-			       dummy, lp->rx_tail, lp->chan_state);
-			return 0;
-		}
-
-		udelay(1);
-	}
-	return -EAGAIN;
-}
-
-static int rx_set_head(struct ldc_channel *lp, unsigned long head)
-{
-	int err = __set_rx_head(lp, head);
-
-	if (err < 0)
-		return ldc_abort(lp);
-
-	lp->rx_head = head;
-	return 0;
-}
-
-static void send_data_ack(struct ldc_channel *lp)
-{
-	unsigned long new_tail;
-	struct ldc_packet *p;
-
-	p = data_get_tx_packet(lp, &new_tail);
-	if (likely(p)) {
-		int err;
-
-		memset(p, 0, sizeof(*p));
-		p->type = LDC_DATA;
-		p->stype = LDC_ACK;
-		p->ctrl = 0;
-		p->seqid = lp->snd_nxt + 1;
-		p->u.r.ackid = lp->rcv_nxt;
-
-		err = send_tx_packet(lp, p, new_tail);
-		if (!err)
-			lp->snd_nxt++;
-	}
-}
-
-static int read_nonraw(struct ldc_channel *lp, void *buf, unsigned int size)
-{
-	struct ldc_packet *first_frag;
-	unsigned long hv_err, new;
-	int err, copied;
-
-	hv_err = sun4v_ldc_rx_get_state(lp->id,
-					&lp->rx_head,
-					&lp->rx_tail,
-					&lp->chan_state);
-	if (hv_err)
-		return ldc_abort(lp);
-
-	if (lp->chan_state == LDC_CHANNEL_DOWN ||
-	    lp->chan_state == LDC_CHANNEL_RESETTING)
-		return -ECONNRESET;
-
-	if (lp->rx_head == lp->rx_tail)
-		return 0;
-
-	first_frag = NULL;
-	copied = err = 0;
-	new = lp->rx_head;
-	while (1) {
-		struct ldc_packet *p;
-		int pkt_len;
-
-		BUG_ON(new == lp->rx_tail);
-		p = lp->rx_base + (new / LDC_PACKET_SIZE);
-
-		ldcdbg(RX, "RX read pkt[%02x:%02x:%02x:%02x:%08x:%08x] "
-		       "rcv_nxt[%08x]\n",
-		       p->type,
-		       p->stype,
-		       p->ctrl,
-		       p->env,
-		       p->seqid,
-		       p->u.r.ackid,
-		       lp->rcv_nxt);
-
-		if (unlikely(!rx_seq_ok(lp, p->seqid))) {
-			err = rx_bad_seq(lp, p, first_frag);
-			copied = 0;
-			break;
-		}
-
-		if (p->type & LDC_CTRL) {
-			err = process_control_frame(lp, p);
-			if (err < 0)
-				break;
-			err = 0;
-		}
-
-		lp->rcv_nxt = p->seqid;
-
-		if (!(p->type & LDC_DATA)) {
-			new = rx_advance(lp, new);
-			goto no_data;
-		}
-		if (p->stype & (LDC_ACK | LDC_NACK)) {
-			err = data_ack_nack(lp, p);
-			if (err)
-				break;
-		}
-		if (!(p->stype & LDC_INFO)) {
-			new = rx_advance(lp, new);
-			err = rx_set_head(lp, new);
-			if (err)
-				break;
-			goto no_data;
-		}
-
-		pkt_len = p->env & LDC_LEN;
-
-		/* Every initial packet starts with the START bit set.
-		 *
-		 * Singleton packets will have both START+STOP set.
-		 *
-		 * Fragments will have START set in the first frame, STOP
-		 * set in the last frame, and neither bit set in middle
-		 * frames of the packet.
-		 *
-		 * Therefore if we are at the beginning of a packet and
-		 * we don't see START, or we are in the middle of a fragmented
-		 * packet and do see START, we are unsynchronized and should
-		 * flush the RX queue.
-		 */
-		if ((first_frag == NULL && !(p->env & LDC_START)) ||
-		    (first_frag != NULL &&  (p->env & LDC_START))) {
-			if (!first_frag)
-				new = rx_advance(lp, new);
-
-			err = rx_set_head(lp, new);
-			if (err)
-				break;
-
-			if (!first_frag)
-				goto no_data;
-		}
-		if (!first_frag)
-			first_frag = p;
-
-		if (pkt_len > size - copied) {
-			/* User didn't give us a big enough buffer,
-			 * what to do?  This is a pretty serious error.
-			 *
-			 * Since we haven't updated the RX ring head to
-			 * consume any of the packets, signal the error
-			 * to the user and just leave the RX ring alone.
-			 *
-			 * This seems the best behavior because this allows
-			 * a user of the LDC layer to start with a small
-			 * RX buffer for ldc_read() calls and use -EMSGSIZE
-			 * as a cue to enlarge it's read buffer.
-			 */
-			err = -EMSGSIZE;
-			break;
-		}
-
-		/* Ok, we are gonna eat this one.  */
-		new = rx_advance(lp, new);
-
-		memcpy(buf,
-		       (lp->cfg.mode == LDC_MODE_UNRELIABLE ?
-			p->u.u_data : p->u.r.r_data), pkt_len);
-		buf += pkt_len;
-		copied += pkt_len;
-
-		if (p->env & LDC_STOP)
-			break;
-
-no_data:
-		if (new == lp->rx_tail) {
-			err = rx_data_wait(lp, new);
-			if (err)
-				break;
-		}
-	}
-
-	if (!err)
-		err = rx_set_head(lp, new);
-
-	if (err && first_frag)
-		lp->rcv_nxt = first_frag->seqid - 1;
-
-	if (!err) {
-		err = copied;
-		if (err > 0 && lp->cfg.mode != LDC_MODE_UNRELIABLE)
-			send_data_ack(lp);
-	}
-
-	return err;
-}
-
-static const struct ldc_mode_ops nonraw_ops = {
-	.write		=	write_nonraw,
-	.read		=	read_nonraw,
-};
-
-static int write_stream(struct ldc_channel *lp, const void *buf,
-			unsigned int size)
-{
-	if (size > lp->cfg.mtu)
-		size = lp->cfg.mtu;
-	return write_nonraw(lp, buf, size);
-}
-
-static int read_stream(struct ldc_channel *lp, void *buf, unsigned int size)
-{
-	if (!lp->mssbuf_len) {
-		int err = read_nonraw(lp, lp->mssbuf, lp->cfg.mtu);
-		if (err < 0)
-			return err;
-
-		lp->mssbuf_len = err;
-		lp->mssbuf_off = 0;
-	}
-
-	if (size > lp->mssbuf_len)
-		size = lp->mssbuf_len;
-	memcpy(buf, lp->mssbuf + lp->mssbuf_off, size);
-
-	lp->mssbuf_off += size;
-	lp->mssbuf_len -= size;
-
-	return size;
-}
-
-static const struct ldc_mode_ops stream_ops = {
-	.write		=	write_stream,
-	.read		=	read_stream,
-};
-
-int ldc_write(struct ldc_channel *lp, const void *buf, unsigned int size)
-{
-	unsigned long flags;
-	int err;
-
-	if (!buf)
-		return -EINVAL;
-
-	if (!size)
-		return 0;
-
-	spin_lock_irqsave(&lp->lock, flags);
-
-	if (lp->hs_state != LDC_HS_COMPLETE)
-		err = -ENOTCONN;
-	else
-		err = lp->mops->write(lp, buf, size);
-
-	spin_unlock_irqrestore(&lp->lock, flags);
-
-	return err;
-}
-EXPORT_SYMBOL(ldc_write);
-
-int ldc_read(struct ldc_channel *lp, void *buf, unsigned int size)
-{
-	unsigned long flags;
-	int err;
-
-	if (!buf)
-		return -EINVAL;
-
-	if (!size)
-		return 0;
-
-	spin_lock_irqsave(&lp->lock, flags);
-
-	if (lp->hs_state != LDC_HS_COMPLETE)
-		err = -ENOTCONN;
-	else
-		err = lp->mops->read(lp, buf, size);
-
-	spin_unlock_irqrestore(&lp->lock, flags);
-
-	return err;
-}
-EXPORT_SYMBOL(ldc_read);
-
-static long arena_alloc(struct ldc_iommu *iommu, unsigned long npages)
-{
-	struct iommu_arena *arena = &iommu->arena;
-	unsigned long n, i, start, end, limit;
-	int pass;
-
-	limit = arena->limit;
-	start = arena->hint;
-	pass = 0;
-
-again:
-	n = find_next_zero_bit(arena->map, limit, start);
-	end = n + npages;
-	if (unlikely(end >= limit)) {
-		if (likely(pass < 1)) {
-			limit = start;
-			start = 0;
-			pass++;
-			goto again;
-		} else {
-			/* Scanned the whole thing, give up. */
-			return -1;
-		}
-	}
-
-	for (i = n; i < end; i++) {
-		if (test_bit(i, arena->map)) {
-			start = i + 1;
-			goto again;
-		}
-	}
-
-	for (i = n; i < end; i++)
-		__set_bit(i, arena->map);
-
-	arena->hint = end;
-
-	return n;
-}
-
-#define COOKIE_PGSZ_CODE	0xf000000000000000ULL
-#define COOKIE_PGSZ_CODE_SHIFT	60ULL
-
-static u64 pagesize_code(void)
-{
-	switch (PAGE_SIZE) {
-	default:
-	case (8ULL * 1024ULL):
-		return 0;
-	case (64ULL * 1024ULL):
-		return 1;
-	case (512ULL * 1024ULL):
-		return 2;
-	case (4ULL * 1024ULL * 1024ULL):
-		return 3;
-	case (32ULL * 1024ULL * 1024ULL):
-		return 4;
-	case (256ULL * 1024ULL * 1024ULL):
-		return 5;
-	}
-}
-
-static u64 make_cookie(u64 index, u64 pgsz_code, u64 page_offset)
-{
-	return ((pgsz_code << COOKIE_PGSZ_CODE_SHIFT) |
-		(index << PAGE_SHIFT) |
-		page_offset);
-}
-
-static u64 cookie_to_index(u64 cookie, unsigned long *shift)
-{
-	u64 szcode = cookie >> COOKIE_PGSZ_CODE_SHIFT;
-
-	cookie &= ~COOKIE_PGSZ_CODE;
-
-	*shift = szcode * 3;
-
-	return (cookie >> (13ULL + (szcode * 3ULL)));
-}
-
-static struct ldc_mtable_entry *alloc_npages(struct ldc_iommu *iommu,
-					     unsigned long npages)
-{
-	long entry;
-
-	entry = arena_alloc(iommu, npages);
-	if (unlikely(entry < 0))
-		return NULL;
-
-	return iommu->page_table + entry;
-}
-
-static u64 perm_to_mte(unsigned int map_perm)
-{
-	u64 mte_base;
-
-	mte_base = pagesize_code();
-
-	if (map_perm & LDC_MAP_SHADOW) {
-		if (map_perm & LDC_MAP_R)
-			mte_base |= LDC_MTE_COPY_R;
-		if (map_perm & LDC_MAP_W)
-			mte_base |= LDC_MTE_COPY_W;
-	}
-	if (map_perm & LDC_MAP_DIRECT) {
-		if (map_perm & LDC_MAP_R)
-			mte_base |= LDC_MTE_READ;
-		if (map_perm & LDC_MAP_W)
-			mte_base |= LDC_MTE_WRITE;
-		if (map_perm & LDC_MAP_X)
-			mte_base |= LDC_MTE_EXEC;
-	}
-	if (map_perm & LDC_MAP_IO) {
-		if (map_perm & LDC_MAP_R)
-			mte_base |= LDC_MTE_IOMMU_R;
-		if (map_perm & LDC_MAP_W)
-			mte_base |= LDC_MTE_IOMMU_W;
-	}
-
-	return mte_base;
-}
-
-static int pages_in_region(unsigned long base, long len)
-{
-	int count = 0;
-
-	do {
-		unsigned long new = (base + PAGE_SIZE) & PAGE_MASK;
-
-		len -= (new - base);
-		base = new;
-		count++;
-	} while (len > 0);
-
-	return count;
-}
-
-struct cookie_state {
-	struct ldc_mtable_entry		*page_table;
-	struct ldc_trans_cookie		*cookies;
-	u64				mte_base;
-	u64				prev_cookie;
-	u32				pte_idx;
-	u32				nc;
-};
-
-static void fill_cookies(struct cookie_state *sp, unsigned long pa,
-			 unsigned long off, unsigned long len)
-{
-	do {
-		unsigned long tlen, new = pa + PAGE_SIZE;
-		u64 this_cookie;
-
-		sp->page_table[sp->pte_idx].mte = sp->mte_base | pa;
-
-		tlen = PAGE_SIZE;
-		if (off)
-			tlen = PAGE_SIZE - off;
-		if (tlen > len)
-			tlen = len;
-
-		this_cookie = make_cookie(sp->pte_idx,
-					  pagesize_code(), off);
-
-		off = 0;
-
-		if (this_cookie == sp->prev_cookie) {
-			sp->cookies[sp->nc - 1].cookie_size += tlen;
-		} else {
-			sp->cookies[sp->nc].cookie_addr = this_cookie;
-			sp->cookies[sp->nc].cookie_size = tlen;
-			sp->nc++;
-		}
-		sp->prev_cookie = this_cookie + tlen;
-
-		sp->pte_idx++;
-
-		len -= tlen;
-		pa = new;
-	} while (len > 0);
-}
-
-static int sg_count_one(struct scatterlist *sg)
-{
-	unsigned long base = page_to_pfn(sg_page(sg)) << PAGE_SHIFT;
-	long len = sg->length;
-
-	if ((sg->offset | len) & (8UL - 1))
-		return -EFAULT;
-
-	return pages_in_region(base + sg->offset, len);
-}
-
-static int sg_count_pages(struct scatterlist *sg, int num_sg)
-{
-	int count;
-	int i;
-
-	count = 0;
-	for (i = 0; i < num_sg; i++) {
-		int err = sg_count_one(sg + i);
-		if (err < 0)
-			return err;
-		count += err;
-	}
-
-	return count;
-}
-
-int ldc_map_sg(struct ldc_channel *lp,
-	       struct scatterlist *sg, int num_sg,
-	       struct ldc_trans_cookie *cookies, int ncookies,
-	       unsigned int map_perm)
-{
-	unsigned long i, npages, flags;
-	struct ldc_mtable_entry *base;
-	struct cookie_state state;
-	struct ldc_iommu *iommu;
-	int err;
-
-	if (map_perm & ~LDC_MAP_ALL)
-		return -EINVAL;
-
-	err = sg_count_pages(sg, num_sg);
-	if (err < 0)
-		return err;
-
-	npages = err;
-	if (err > ncookies)
-		return -EMSGSIZE;
-
-	iommu = &lp->iommu;
-
-	spin_lock_irqsave(&iommu->lock, flags);
-	base = alloc_npages(iommu, npages);
-	spin_unlock_irqrestore(&iommu->lock, flags);
-
-	if (!base)
-		return -ENOMEM;
-
-	state.page_table = iommu->page_table;
-	state.cookies = cookies;
-	state.mte_base = perm_to_mte(map_perm);
-	state.prev_cookie = ~(u64)0;
-	state.pte_idx = (base - iommu->page_table);
-	state.nc = 0;
-
-	for (i = 0; i < num_sg; i++)
-		fill_cookies(&state, page_to_pfn(sg_page(&sg[i])) << PAGE_SHIFT,
-			     sg[i].offset, sg[i].length);
-
-	return state.nc;
-}
-EXPORT_SYMBOL(ldc_map_sg);
-
-int ldc_map_single(struct ldc_channel *lp,
-		   void *buf, unsigned int len,
-		   struct ldc_trans_cookie *cookies, int ncookies,
-		   unsigned int map_perm)
-{
-	unsigned long npages, pa, flags;
-	struct ldc_mtable_entry *base;
-	struct cookie_state state;
-	struct ldc_iommu *iommu;
-
-	if ((map_perm & ~LDC_MAP_ALL) || (ncookies < 1))
-		return -EINVAL;
-
-	pa = __pa(buf);
-	if ((pa | len) & (8UL - 1))
-		return -EFAULT;
-
-	npages = pages_in_region(pa, len);
-
-	iommu = &lp->iommu;
-
-	spin_lock_irqsave(&iommu->lock, flags);
-	base = alloc_npages(iommu, npages);
-	spin_unlock_irqrestore(&iommu->lock, flags);
-
-	if (!base)
-		return -ENOMEM;
-
-	state.page_table = iommu->page_table;
-	state.cookies = cookies;
-	state.mte_base = perm_to_mte(map_perm);
-	state.prev_cookie = ~(u64)0;
-	state.pte_idx = (base - iommu->page_table);
-	state.nc = 0;
-	fill_cookies(&state, (pa & PAGE_MASK), (pa & ~PAGE_MASK), len);
-	BUG_ON(state.nc != 1);
-
-	return state.nc;
-}
-EXPORT_SYMBOL(ldc_map_single);
-
-static void free_npages(unsigned long id, struct ldc_iommu *iommu,
-			u64 cookie, u64 size)
-{
-	struct iommu_arena *arena = &iommu->arena;
-	unsigned long i, shift, index, npages;
-	struct ldc_mtable_entry *base;
-
-	npages = PAGE_ALIGN(((cookie & ~PAGE_MASK) + size)) >> PAGE_SHIFT;
-	index = cookie_to_index(cookie, &shift);
-	base = iommu->page_table + index;
-
-	BUG_ON(index > arena->limit ||
-	       (index + npages) > arena->limit);
-
-	for (i = 0; i < npages; i++) {
-		if (base->cookie)
-			sun4v_ldc_revoke(id, cookie + (i << shift),
-					 base->cookie);
-		base->mte = 0;
-		__clear_bit(index + i, arena->map);
-	}
-}
-
-void ldc_unmap(struct ldc_channel *lp, struct ldc_trans_cookie *cookies,
-	       int ncookies)
-{
-	struct ldc_iommu *iommu = &lp->iommu;
-	unsigned long flags;
-	int i;
-
-	spin_lock_irqsave(&iommu->lock, flags);
-	for (i = 0; i < ncookies; i++) {
-		u64 addr = cookies[i].cookie_addr;
-		u64 size = cookies[i].cookie_size;
-
-		free_npages(lp->id, iommu, addr, size);
-	}
-	spin_unlock_irqrestore(&iommu->lock, flags);
-}
-EXPORT_SYMBOL(ldc_unmap);
-
-int ldc_copy(struct ldc_channel *lp, int copy_dir,
-	     void *buf, unsigned int len, unsigned long offset,
-	     struct ldc_trans_cookie *cookies, int ncookies)
-{
-	unsigned int orig_len;
-	unsigned long ra;
-	int i;
-
-	if (copy_dir != LDC_COPY_IN && copy_dir != LDC_COPY_OUT) {
-		printk(KERN_ERR PFX "ldc_copy: ID[%lu] Bad copy_dir[%d]\n",
-		       lp->id, copy_dir);
-		return -EINVAL;
-	}
-
-	ra = __pa(buf);
-	if ((ra | len | offset) & (8UL - 1)) {
-		printk(KERN_ERR PFX "ldc_copy: ID[%lu] Unaligned buffer "
-		       "ra[%lx] len[%x] offset[%lx]\n",
-		       lp->id, ra, len, offset);
-		return -EFAULT;
-	}
-
-	if (lp->hs_state != LDC_HS_COMPLETE ||
-	    (lp->flags & LDC_FLAG_RESET)) {
-		printk(KERN_ERR PFX "ldc_copy: ID[%lu] Link down hs_state[%x] "
-		       "flags[%x]\n", lp->id, lp->hs_state, lp->flags);
-		return -ECONNRESET;
-	}
-
-	orig_len = len;
-	for (i = 0; i < ncookies; i++) {
-		unsigned long cookie_raddr = cookies[i].cookie_addr;
-		unsigned long this_len = cookies[i].cookie_size;
-		unsigned long actual_len;
-
-		if (unlikely(offset)) {
-			unsigned long this_off = offset;
-
-			if (this_off > this_len)
-				this_off = this_len;
-
-			offset -= this_off;
-			this_len -= this_off;
-			if (!this_len)
-				continue;
-			cookie_raddr += this_off;
-		}
-
-		if (this_len > len)
-			this_len = len;
-
-		while (1) {
-			unsigned long hv_err;
-
-			hv_err = sun4v_ldc_copy(lp->id, copy_dir,
-						cookie_raddr, ra,
-						this_len, &actual_len);
-			if (unlikely(hv_err)) {
-				printk(KERN_ERR PFX "ldc_copy: ID[%lu] "
-				       "HV error %lu\n",
-				       lp->id, hv_err);
-				if (lp->hs_state != LDC_HS_COMPLETE ||
-				    (lp->flags & LDC_FLAG_RESET))
-					return -ECONNRESET;
-				else
-					return -EFAULT;
-			}
-
-			cookie_raddr += actual_len;
-			ra += actual_len;
-			len -= actual_len;
-			if (actual_len == this_len)
-				break;
-
-			this_len -= actual_len;
-		}
-
-		if (!len)
-			break;
-	}
-
-	/* It is caller policy what to do about short copies.
-	 * For example, a networking driver can declare the
-	 * packet a runt and drop it.
-	 */
-
-	return orig_len - len;
-}
-EXPORT_SYMBOL(ldc_copy);
-
-void *ldc_alloc_exp_dring(struct ldc_channel *lp, unsigned int len,
-			  struct ldc_trans_cookie *cookies, int *ncookies,
-			  unsigned int map_perm)
-{
-	void *buf;
-	int err;
-
-	if (len & (8UL - 1))
-		return ERR_PTR(-EINVAL);
-
-	buf = kzalloc(len, GFP_KERNEL);
-	if (!buf)
-		return ERR_PTR(-ENOMEM);
-
-	err = ldc_map_single(lp, buf, len, cookies, *ncookies, map_perm);
-	if (err < 0) {
-		kfree(buf);
-		return ERR_PTR(err);
-	}
-	*ncookies = err;
-
-	return buf;
-}
-EXPORT_SYMBOL(ldc_alloc_exp_dring);
-
-void ldc_free_exp_dring(struct ldc_channel *lp, void *buf, unsigned int len,
-			struct ldc_trans_cookie *cookies, int ncookies)
-{
-	ldc_unmap(lp, cookies, ncookies);
-	kfree(buf);
-}
-EXPORT_SYMBOL(ldc_free_exp_dring);
-
-static int __init ldc_init(void)
-{
-	unsigned long major, minor;
-	struct mdesc_handle *hp;
-	const u64 *v;
-	int err;
-	u64 mp;
-
-	hp = mdesc_grab();
-	if (!hp)
-		return -ENODEV;
-
-	mp = mdesc_node_by_name(hp, MDESC_NODE_NULL, "platform");
-	err = -ENODEV;
-	if (mp == MDESC_NODE_NULL)
-		goto out;
-
-	v = mdesc_get_property(hp, mp, "domaining-enabled", NULL);
-	if (!v)
-		goto out;
-
-	major = 1;
-	minor = 0;
-	if (sun4v_hvapi_register(HV_GRP_LDOM, major, &minor)) {
-		printk(KERN_INFO PFX "Could not register LDOM hvapi.\n");
-		goto out;
-	}
-
-	printk(KERN_INFO "%s", version);
-
-	if (!*v) {
-		printk(KERN_INFO PFX "Domaining disabled.\n");
-		goto out;
-	}
-	ldom_domaining_enabled = 1;
-	err = 0;
-
-out:
-	mdesc_release(hp);
-	return err;
-}
-
-core_initcall(ldc_init);