Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1275 insertions, 0 deletions

diff --git a/arch/sparc/kernel/ds.c b/arch/sparc/kernel/ds.c
new file mode 100644
index 000000000..522e5b510
--- /dev/null
+++ b/arch/sparc/kernel/ds.c
@@ -0,0 +1,1275 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* ds.c: Domain Services driver for Logical Domains
+ *
+ * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net>
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+#include <linux/sched.h>
+#include <linux/sched/clock.h>
+#include <linux/delay.h>
+#include <linux/mutex.h>
+#include <linux/kthread.h>
+#include <linux/reboot.h>
+#include <linux/cpu.h>
+
+#include <asm/hypervisor.h>
+#include <asm/ldc.h>
+#include <asm/vio.h>
+#include <asm/mdesc.h>
+#include <asm/head.h>
+#include <asm/irq.h>
+
+#include "kernel.h"
+
+#define DRV_MODULE_NAME		"ds"
+#define PFX DRV_MODULE_NAME	": "
+#define DRV_MODULE_VERSION	"1.0"
+#define DRV_MODULE_RELDATE	"Jul 11, 2007"
+
+static char version[] =
+	DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
+MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
+MODULE_DESCRIPTION("Sun LDOM domain services driver");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(DRV_MODULE_VERSION);
+
+struct ds_msg_tag {
+	__u32			type;
+#define DS_INIT_REQ		0x00
+#define DS_INIT_ACK		0x01
+#define DS_INIT_NACK		0x02
+#define DS_REG_REQ		0x03
+#define DS_REG_ACK		0x04
+#define DS_REG_NACK		0x05
+#define DS_UNREG_REQ		0x06
+#define DS_UNREG_ACK		0x07
+#define DS_UNREG_NACK		0x08
+#define DS_DATA			0x09
+#define DS_NACK			0x0a
+
+	__u32			len;
+};
+
+/* Result codes */
+#define DS_OK			0x00
+#define DS_REG_VER_NACK		0x01
+#define DS_REG_DUP		0x02
+#define DS_INV_HDL		0x03
+#define DS_TYPE_UNKNOWN		0x04
+
+struct ds_version {
+	__u16			major;
+	__u16			minor;
+};
+
+struct ds_ver_req {
+	struct ds_msg_tag	tag;
+	struct ds_version	ver;
+};
+
+struct ds_ver_ack {
+	struct ds_msg_tag	tag;
+	__u16			minor;
+};
+
+struct ds_ver_nack {
+	struct ds_msg_tag	tag;
+	__u16			major;
+};
+
+struct ds_reg_req {
+	struct ds_msg_tag	tag;
+	__u64			handle;
+	__u16			major;
+	__u16			minor;
+	char			svc_id[];
+};
+
+struct ds_reg_ack {
+	struct ds_msg_tag	tag;
+	__u64			handle;
+	__u16			minor;
+};
+
+struct ds_reg_nack {
+	struct ds_msg_tag	tag;
+	__u64			handle;
+	__u16			major;
+};
+
+struct ds_unreg_req {
+	struct ds_msg_tag	tag;
+	__u64			handle;
+};
+
+struct ds_unreg_ack {
+	struct ds_msg_tag	tag;
+	__u64			handle;
+};
+
+struct ds_unreg_nack {
+	struct ds_msg_tag	tag;
+	__u64			handle;
+};
+
+struct ds_data {
+	struct ds_msg_tag	tag;
+	__u64			handle;
+};
+
+struct ds_data_nack {
+	struct ds_msg_tag	tag;
+	__u64			handle;
+	__u64			result;
+};
+
+struct ds_info;
+struct ds_cap_state {
+	__u64			handle;
+
+	void			(*data)(struct ds_info *dp,
+					struct ds_cap_state *cp,
+					void *buf, int len);
+
+	const char		*service_id;
+
+	u8			state;
+#define CAP_STATE_UNKNOWN	0x00
+#define CAP_STATE_REG_SENT	0x01
+#define CAP_STATE_REGISTERED	0x02
+};
+
+static void md_update_data(struct ds_info *dp, struct ds_cap_state *cp,
+			   void *buf, int len);
+static void domain_shutdown_data(struct ds_info *dp,
+				 struct ds_cap_state *cp,
+				 void *buf, int len);
+static void domain_panic_data(struct ds_info *dp,
+			      struct ds_cap_state *cp,
+			      void *buf, int len);
+#ifdef CONFIG_HOTPLUG_CPU
+static void dr_cpu_data(struct ds_info *dp,
+			struct ds_cap_state *cp,
+			void *buf, int len);
+#endif
+static void ds_pri_data(struct ds_info *dp,
+			struct ds_cap_state *cp,
+			void *buf, int len);
+static void ds_var_data(struct ds_info *dp,
+			struct ds_cap_state *cp,
+			void *buf, int len);
+
+static struct ds_cap_state ds_states_template[] = {
+	{
+		.service_id	= "md-update",
+		.data		= md_update_data,
+	},
+	{
+		.service_id	= "domain-shutdown",
+		.data		= domain_shutdown_data,
+	},
+	{
+		.service_id	= "domain-panic",
+		.data		= domain_panic_data,
+	},
+#ifdef CONFIG_HOTPLUG_CPU
+	{
+		.service_id	= "dr-cpu",
+		.data		= dr_cpu_data,
+	},
+#endif
+	{
+		.service_id	= "pri",
+		.data		= ds_pri_data,
+	},
+	{
+		.service_id	= "var-config",
+		.data		= ds_var_data,
+	},
+	{
+		.service_id	= "var-config-backup",
+		.data		= ds_var_data,
+	},
+};
+
+static DEFINE_SPINLOCK(ds_lock);
+
+struct ds_info {
+	struct ldc_channel	*lp;
+	u8			hs_state;
+#define DS_HS_START		0x01
+#define DS_HS_DONE		0x02
+
+	u64			id;
+
+	void			*rcv_buf;
+	int			rcv_buf_len;
+
+	struct ds_cap_state	*ds_states;
+	int			num_ds_states;
+
+	struct ds_info		*next;
+};
+
+static struct ds_info *ds_info_list;
+
+static struct ds_cap_state *find_cap(struct ds_info *dp, u64 handle)
+{
+	unsigned int index = handle >> 32;
+
+	if (index >= dp->num_ds_states)
+		return NULL;
+	return &dp->ds_states[index];
+}
+
+static struct ds_cap_state *find_cap_by_string(struct ds_info *dp,
+					       const char *name)
+{
+	int i;
+
+	for (i = 0; i < dp->num_ds_states; i++) {
+		if (strcmp(dp->ds_states[i].service_id, name))
+			continue;
+
+		return &dp->ds_states[i];
+	}
+	return NULL;
+}
+
+static int __ds_send(struct ldc_channel *lp, void *data, int len)
+{
+	int err, limit = 1000;
+
+	err = -EINVAL;
+	while (limit-- > 0) {
+		err = ldc_write(lp, data, len);
+		if (!err || (err != -EAGAIN))
+			break;
+		udelay(1);
+	}
+
+	return err;
+}
+
+static int ds_send(struct ldc_channel *lp, void *data, int len)
+{
+	unsigned long flags;
+	int err;
+
+	spin_lock_irqsave(&ds_lock, flags);
+	err = __ds_send(lp, data, len);
+	spin_unlock_irqrestore(&ds_lock, flags);
+
+	return err;
+}
+
+struct ds_md_update_req {
+	__u64				req_num;
+};
+
+struct ds_md_update_res {
+	__u64				req_num;
+	__u32				result;
+};
+
+static void md_update_data(struct ds_info *dp,
+			   struct ds_cap_state *cp,
+			   void *buf, int len)
+{
+	struct ldc_channel *lp = dp->lp;
+	struct ds_data *dpkt = buf;
+	struct ds_md_update_req *rp;
+	struct {
+		struct ds_data		data;
+		struct ds_md_update_res	res;
+	} pkt;
+
+	rp = (struct ds_md_update_req *) (dpkt + 1);
+
+	printk(KERN_INFO "ds-%llu: Machine description update.\n", dp->id);
+
+	mdesc_update();
+
+	memset(&pkt, 0, sizeof(pkt));
+	pkt.data.tag.type = DS_DATA;
+	pkt.data.tag.len = sizeof(pkt) - sizeof(struct ds_msg_tag);
+	pkt.data.handle = cp->handle;
+	pkt.res.req_num = rp->req_num;
+	pkt.res.result = DS_OK;
+
+	ds_send(lp, &pkt, sizeof(pkt));
+}
+
+struct ds_shutdown_req {
+	__u64				req_num;
+	__u32				ms_delay;
+};
+
+struct ds_shutdown_res {
+	__u64				req_num;
+	__u32				result;
+	char				reason[1];
+};
+
+static void domain_shutdown_data(struct ds_info *dp,
+				 struct ds_cap_state *cp,
+				 void *buf, int len)
+{
+	struct ldc_channel *lp = dp->lp;
+	struct ds_data *dpkt = buf;
+	struct ds_shutdown_req *rp;
+	struct {
+		struct ds_data		data;
+		struct ds_shutdown_res	res;
+	} pkt;
+
+	rp = (struct ds_shutdown_req *) (dpkt + 1);
+
+	printk(KERN_ALERT "ds-%llu: Shutdown request from "
+	       "LDOM manager received.\n", dp->id);
+
+	memset(&pkt, 0, sizeof(pkt));
+	pkt.data.tag.type = DS_DATA;
+	pkt.data.tag.len = sizeof(pkt) - sizeof(struct ds_msg_tag);
+	pkt.data.handle = cp->handle;
+	pkt.res.req_num = rp->req_num;
+	pkt.res.result = DS_OK;
+	pkt.res.reason[0] = 0;
+
+	ds_send(lp, &pkt, sizeof(pkt));
+
+	orderly_poweroff(true);
+}
+
+struct ds_panic_req {
+	__u64				req_num;
+};
+
+struct ds_panic_res {
+	__u64				req_num;
+	__u32				result;
+	char				reason[1];
+};
+
+static void domain_panic_data(struct ds_info *dp,
+			      struct ds_cap_state *cp,
+			      void *buf, int len)
+{
+	struct ldc_channel *lp = dp->lp;
+	struct ds_data *dpkt = buf;
+	struct ds_panic_req *rp;
+	struct {
+		struct ds_data		data;
+		struct ds_panic_res	res;
+	} pkt;
+
+	rp = (struct ds_panic_req *) (dpkt + 1);
+
+	printk(KERN_ALERT "ds-%llu: Panic request from "
+	       "LDOM manager received.\n", dp->id);
+
+	memset(&pkt, 0, sizeof(pkt));
+	pkt.data.tag.type = DS_DATA;
+	pkt.data.tag.len = sizeof(pkt) - sizeof(struct ds_msg_tag);
+	pkt.data.handle = cp->handle;
+	pkt.res.req_num = rp->req_num;
+	pkt.res.result = DS_OK;
+	pkt.res.reason[0] = 0;
+
+	ds_send(lp, &pkt, sizeof(pkt));
+
+	panic("PANIC requested by LDOM manager.");
+}
+
+#ifdef CONFIG_HOTPLUG_CPU
+struct dr_cpu_tag {
+	__u64				req_num;
+	__u32				type;
+#define DR_CPU_CONFIGURE		0x43
+#define DR_CPU_UNCONFIGURE		0x55
+#define DR_CPU_FORCE_UNCONFIGURE	0x46
+#define DR_CPU_STATUS			0x53
+
+/* Responses */
+#define DR_CPU_OK			0x6f
+#define DR_CPU_ERROR			0x65
+
+	__u32				num_records;
+};
+
+struct dr_cpu_resp_entry {
+	__u32				cpu;
+	__u32				result;
+#define DR_CPU_RES_OK			0x00
+#define DR_CPU_RES_FAILURE		0x01
+#define DR_CPU_RES_BLOCKED		0x02
+#define DR_CPU_RES_CPU_NOT_RESPONDING	0x03
+#define DR_CPU_RES_NOT_IN_MD		0x04
+
+	__u32				stat;
+#define DR_CPU_STAT_NOT_PRESENT		0x00
+#define DR_CPU_STAT_UNCONFIGURED	0x01
+#define DR_CPU_STAT_CONFIGURED		0x02
+
+	__u32				str_off;
+};
+
+static void __dr_cpu_send_error(struct ds_info *dp,
+				struct ds_cap_state *cp,
+				struct ds_data *data)
+{
+	struct dr_cpu_tag *tag = (struct dr_cpu_tag *) (data + 1);
+	struct {
+		struct ds_data		data;
+		struct dr_cpu_tag	tag;
+	} pkt;
+	int msg_len;
+
+	memset(&pkt, 0, sizeof(pkt));
+	pkt.data.tag.type = DS_DATA;
+	pkt.data.handle = cp->handle;
+	pkt.tag.req_num = tag->req_num;
+	pkt.tag.type = DR_CPU_ERROR;
+	pkt.tag.num_records = 0;
+
+	msg_len = (sizeof(struct ds_data) +
+		   sizeof(struct dr_cpu_tag));
+
+	pkt.data.tag.len = msg_len - sizeof(struct ds_msg_tag);
+
+	__ds_send(dp->lp, &pkt, msg_len);
+}
+
+static void dr_cpu_send_error(struct ds_info *dp,
+			      struct ds_cap_state *cp,
+			      struct ds_data *data)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&ds_lock, flags);
+	__dr_cpu_send_error(dp, cp, data);
+	spin_unlock_irqrestore(&ds_lock, flags);
+}
+
+#define CPU_SENTINEL	0xffffffff
+
+static void purge_dups(u32 *list, u32 num_ents)
+{
+	unsigned int i;
+
+	for (i = 0; i < num_ents; i++) {
+		u32 cpu = list[i];
+		unsigned int j;
+
+		if (cpu == CPU_SENTINEL)
+			continue;
+
+		for (j = i + 1; j < num_ents; j++) {
+			if (list[j] == cpu)
+				list[j] = CPU_SENTINEL;
+		}
+	}
+}
+
+static int dr_cpu_size_response(int ncpus)
+{
+	return (sizeof(struct ds_data) +
+		sizeof(struct dr_cpu_tag) +
+		(sizeof(struct dr_cpu_resp_entry) * ncpus));
+}
+
+static void dr_cpu_init_response(struct ds_data *resp, u64 req_num,
+				 u64 handle, int resp_len, int ncpus,
+				 cpumask_t *mask, u32 default_stat)
+{
+	struct dr_cpu_resp_entry *ent;
+	struct dr_cpu_tag *tag;
+	int i, cpu;
+
+	tag = (struct dr_cpu_tag *) (resp + 1);
+	ent = (struct dr_cpu_resp_entry *) (tag + 1);
+
+	resp->tag.type = DS_DATA;
+	resp->tag.len = resp_len - sizeof(struct ds_msg_tag);
+	resp->handle = handle;
+	tag->req_num = req_num;
+	tag->type = DR_CPU_OK;
+	tag->num_records = ncpus;
+
+	i = 0;
+	for_each_cpu(cpu, mask) {
+		ent[i].cpu = cpu;
+		ent[i].result = DR_CPU_RES_OK;
+		ent[i].stat = default_stat;
+		i++;
+	}
+	BUG_ON(i != ncpus);
+}
+
+static void dr_cpu_mark(struct ds_data *resp, int cpu, int ncpus,
+			u32 res, u32 stat)
+{
+	struct dr_cpu_resp_entry *ent;
+	struct dr_cpu_tag *tag;
+	int i;
+
+	tag = (struct dr_cpu_tag *) (resp + 1);
+	ent = (struct dr_cpu_resp_entry *) (tag + 1);
+
+	for (i = 0; i < ncpus; i++) {
+		if (ent[i].cpu != cpu)
+			continue;
+		ent[i].result = res;
+		ent[i].stat = stat;
+		break;
+	}
+}
+
+static int dr_cpu_configure(struct ds_info *dp, struct ds_cap_state *cp,
+			    u64 req_num, cpumask_t *mask)
+{
+	struct ds_data *resp;
+	int resp_len, ncpus, cpu;
+	unsigned long flags;
+
+	ncpus = cpumask_weight(mask);
+	resp_len = dr_cpu_size_response(ncpus);
+	resp = kzalloc(resp_len, GFP_KERNEL);
+	if (!resp)
+		return -ENOMEM;
+
+	dr_cpu_init_response(resp, req_num, cp->handle,
+			     resp_len, ncpus, mask,
+			     DR_CPU_STAT_CONFIGURED);
+
+	mdesc_populate_present_mask(mask);
+	mdesc_fill_in_cpu_data(mask);
+
+	for_each_cpu(cpu, mask) {
+		int err;
+
+		printk(KERN_INFO "ds-%llu: Starting cpu %d...\n",
+		       dp->id, cpu);
+		err = add_cpu(cpu);
+		if (err) {
+			__u32 res = DR_CPU_RES_FAILURE;
+			__u32 stat = DR_CPU_STAT_UNCONFIGURED;
+
+			if (!cpu_present(cpu)) {
+				/* CPU not present in MD */
+				res = DR_CPU_RES_NOT_IN_MD;
+				stat = DR_CPU_STAT_NOT_PRESENT;
+			} else if (err == -ENODEV) {
+				/* CPU did not call in successfully */
+				res = DR_CPU_RES_CPU_NOT_RESPONDING;
+			}
+
+			printk(KERN_INFO "ds-%llu: CPU startup failed err=%d\n",
+			       dp->id, err);
+			dr_cpu_mark(resp, cpu, ncpus, res, stat);
+		}
+	}
+
+	spin_lock_irqsave(&ds_lock, flags);
+	__ds_send(dp->lp, resp, resp_len);
+	spin_unlock_irqrestore(&ds_lock, flags);
+
+	kfree(resp);
+
+	/* Redistribute IRQs, taking into account the new cpus.  */
+	fixup_irqs();
+
+	return 0;
+}
+
+static int dr_cpu_unconfigure(struct ds_info *dp,
+			      struct ds_cap_state *cp,
+			      u64 req_num,
+			      cpumask_t *mask)
+{
+	struct ds_data *resp;
+	int resp_len, ncpus, cpu;
+	unsigned long flags;
+
+	ncpus = cpumask_weight(mask);
+	resp_len = dr_cpu_size_response(ncpus);
+	resp = kzalloc(resp_len, GFP_KERNEL);
+	if (!resp)
+		return -ENOMEM;
+
+	dr_cpu_init_response(resp, req_num, cp->handle,
+			     resp_len, ncpus, mask,
+			     DR_CPU_STAT_UNCONFIGURED);
+
+	for_each_cpu(cpu, mask) {
+		int err;
+
+		printk(KERN_INFO "ds-%llu: Shutting down cpu %d...\n",
+		       dp->id, cpu);
+		err = remove_cpu(cpu);
+		if (err)
+			dr_cpu_mark(resp, cpu, ncpus,
+				    DR_CPU_RES_FAILURE,
+				    DR_CPU_STAT_CONFIGURED);
+	}
+
+	spin_lock_irqsave(&ds_lock, flags);
+	__ds_send(dp->lp, resp, resp_len);
+	spin_unlock_irqrestore(&ds_lock, flags);
+
+	kfree(resp);
+
+	return 0;
+}
+
+static void dr_cpu_data(struct ds_info *dp, struct ds_cap_state *cp, void *buf,
+			int len)
+{
+	struct ds_data *data = buf;
+	struct dr_cpu_tag *tag = (struct dr_cpu_tag *) (data + 1);
+	u32 *cpu_list = (u32 *) (tag + 1);
+	u64 req_num = tag->req_num;
+	cpumask_t mask;
+	unsigned int i;
+	int err;
+
+	switch (tag->type) {
+	case DR_CPU_CONFIGURE:
+	case DR_CPU_UNCONFIGURE:
+	case DR_CPU_FORCE_UNCONFIGURE:
+		break;
+
+	default:
+		dr_cpu_send_error(dp, cp, data);
+		return;
+	}
+
+	purge_dups(cpu_list, tag->num_records);
+
+	cpumask_clear(&mask);
+	for (i = 0; i < tag->num_records; i++) {
+		if (cpu_list[i] == CPU_SENTINEL)
+			continue;
+
+		if (cpu_list[i] < nr_cpu_ids)
+			cpumask_set_cpu(cpu_list[i], &mask);
+	}
+
+	if (tag->type == DR_CPU_CONFIGURE)
+		err = dr_cpu_configure(dp, cp, req_num, &mask);
+	else
+		err = dr_cpu_unconfigure(dp, cp, req_num, &mask);
+
+	if (err)
+		dr_cpu_send_error(dp, cp, data);
+}
+#endif /* CONFIG_HOTPLUG_CPU */
+
+struct ds_pri_msg {
+	__u64				req_num;
+	__u64				type;
+#define DS_PRI_REQUEST			0x00
+#define DS_PRI_DATA			0x01
+#define DS_PRI_UPDATE			0x02
+};
+
+static void ds_pri_data(struct ds_info *dp,
+			struct ds_cap_state *cp,
+			void *buf, int len)
+{
+	struct ds_data *dpkt = buf;
+	struct ds_pri_msg *rp;
+
+	rp = (struct ds_pri_msg *) (dpkt + 1);
+
+	printk(KERN_INFO "ds-%llu: PRI REQ [%llx:%llx], len=%d\n",
+	       dp->id, rp->req_num, rp->type, len);
+}
+
+struct ds_var_hdr {
+	__u32				type;
+#define DS_VAR_SET_REQ			0x00
+#define DS_VAR_DELETE_REQ		0x01
+#define DS_VAR_SET_RESP			0x02
+#define DS_VAR_DELETE_RESP		0x03
+};
+
+struct ds_var_set_msg {
+	struct ds_var_hdr		hdr;
+	char				name_and_value[];
+};
+
+struct ds_var_delete_msg {
+	struct ds_var_hdr		hdr;
+	char				name[];
+};
+
+struct ds_var_resp {
+	struct ds_var_hdr		hdr;
+	__u32				result;
+#define DS_VAR_SUCCESS			0x00
+#define DS_VAR_NO_SPACE			0x01
+#define DS_VAR_INVALID_VAR		0x02
+#define DS_VAR_INVALID_VAL		0x03
+#define DS_VAR_NOT_PRESENT		0x04
+};
+
+static DEFINE_MUTEX(ds_var_mutex);
+static int ds_var_doorbell;
+static int ds_var_response;
+
+static void ds_var_data(struct ds_info *dp,
+			struct ds_cap_state *cp,
+			void *buf, int len)
+{
+	struct ds_data *dpkt = buf;
+	struct ds_var_resp *rp;
+
+	rp = (struct ds_var_resp *) (dpkt + 1);
+
+	if (rp->hdr.type != DS_VAR_SET_RESP &&
+	    rp->hdr.type != DS_VAR_DELETE_RESP)
+		return;
+
+	ds_var_response = rp->result;
+	wmb();
+	ds_var_doorbell = 1;
+}
+
+void ldom_set_var(const char *var, const char *value)
+{
+	struct ds_cap_state *cp;
+	struct ds_info *dp;
+	unsigned long flags;
+
+	spin_lock_irqsave(&ds_lock, flags);
+	cp = NULL;
+	for (dp = ds_info_list; dp; dp = dp->next) {
+		struct ds_cap_state *tmp;
+
+		tmp = find_cap_by_string(dp, "var-config");
+		if (tmp && tmp->state == CAP_STATE_REGISTERED) {
+			cp = tmp;
+			break;
+		}
+	}
+	if (!cp) {
+		for (dp = ds_info_list; dp; dp = dp->next) {
+			struct ds_cap_state *tmp;
+
+			tmp = find_cap_by_string(dp, "var-config-backup");
+			if (tmp && tmp->state == CAP_STATE_REGISTERED) {
+				cp = tmp;
+				break;
+			}
+		}
+	}
+	spin_unlock_irqrestore(&ds_lock, flags);
+
+	if (cp) {
+		union {
+			struct {
+				struct ds_data		data;
+				struct ds_var_set_msg	msg;
+			} header;
+			char			all[512];
+		} pkt;
+		char  *base, *p;
+		int msg_len, loops;
+
+		if (strlen(var) + strlen(value) + 2 >
+		    sizeof(pkt) - sizeof(pkt.header)) {
+			printk(KERN_ERR PFX
+				"contents length: %zu, which more than max: %lu,"
+				"so could not set (%s) variable to (%s).\n",
+				strlen(var) + strlen(value) + 2,
+				sizeof(pkt) - sizeof(pkt.header), var, value);
+			return;
+		}
+
+		memset(&pkt, 0, sizeof(pkt));
+		pkt.header.data.tag.type = DS_DATA;
+		pkt.header.data.handle = cp->handle;
+		pkt.header.msg.hdr.type = DS_VAR_SET_REQ;
+		base = p = &pkt.header.msg.name_and_value[0];
+		strcpy(p, var);
+		p += strlen(var) + 1;
+		strcpy(p, value);
+		p += strlen(value) + 1;
+
+		msg_len = (sizeof(struct ds_data) +
+			   sizeof(struct ds_var_set_msg) +
+			   (p - base));
+		msg_len = (msg_len + 3) & ~3;
+		pkt.header.data.tag.len = msg_len - sizeof(struct ds_msg_tag);
+
+		mutex_lock(&ds_var_mutex);
+
+		spin_lock_irqsave(&ds_lock, flags);
+		ds_var_doorbell = 0;
+		ds_var_response = -1;
+
+		__ds_send(dp->lp, &pkt, msg_len);
+		spin_unlock_irqrestore(&ds_lock, flags);
+
+		loops = 1000;
+		while (ds_var_doorbell == 0) {
+			if (loops-- < 0)
+				break;
+			barrier();
+			udelay(100);
+		}
+
+		mutex_unlock(&ds_var_mutex);
+
+		if (ds_var_doorbell == 0 ||
+		    ds_var_response != DS_VAR_SUCCESS)
+			printk(KERN_ERR "ds-%llu: var-config [%s:%s] "
+			       "failed, response(%d).\n",
+			       dp->id, var, value,
+			       ds_var_response);
+	} else {
+		printk(KERN_ERR PFX "var-config not registered so "
+		       "could not set (%s) variable to (%s).\n",
+		       var, value);
+	}
+}
+
+static char full_boot_str[256] __attribute__((aligned(32)));
+static int reboot_data_supported;
+
+void ldom_reboot(const char *boot_command)
+{
+	/* Don't bother with any of this if the boot_command
+	 * is empty.
+	 */
+	if (boot_command && strlen(boot_command)) {
+		unsigned long len;
+
+		snprintf(full_boot_str, sizeof(full_boot_str), "boot %s",
+			 boot_command);
+		len = strlen(full_boot_str);
+
+		if (reboot_data_supported) {
+			unsigned long ra = kimage_addr_to_ra(full_boot_str);
+			unsigned long hv_ret;
+
+			hv_ret = sun4v_reboot_data_set(ra, len);
+			if (hv_ret != HV_EOK)
+				pr_err("SUN4V: Unable to set reboot data "
+				       "hv_ret=%lu\n", hv_ret);
+		} else {
+			ldom_set_var("reboot-command", full_boot_str);
+		}
+	}
+	sun4v_mach_sir();
+}
+
+void ldom_power_off(void)
+{
+	sun4v_mach_exit(0);
+}
+
+static void ds_conn_reset(struct ds_info *dp)
+{
+	printk(KERN_ERR "ds-%llu: ds_conn_reset() from %ps\n",
+	       dp->id, __builtin_return_address(0));
+}
+
+static int register_services(struct ds_info *dp)
+{
+	struct ldc_channel *lp = dp->lp;
+	int i;
+
+	for (i = 0; i < dp->num_ds_states; i++) {
+		struct {
+			struct ds_reg_req req;
+			u8 id_buf[256];
+		} pbuf;
+		struct ds_cap_state *cp = &dp->ds_states[i];
+		int err, msg_len;
+		u64 new_count;
+
+		if (cp->state == CAP_STATE_REGISTERED)
+			continue;
+
+		new_count = sched_clock() & 0xffffffff;
+		cp->handle = ((u64) i << 32) | new_count;
+
+		msg_len = (sizeof(struct ds_reg_req) +
+			   strlen(cp->service_id));
+
+		memset(&pbuf, 0, sizeof(pbuf));
+		pbuf.req.tag.type = DS_REG_REQ;
+		pbuf.req.tag.len = (msg_len - sizeof(struct ds_msg_tag));
+		pbuf.req.handle = cp->handle;
+		pbuf.req.major = 1;
+		pbuf.req.minor = 0;
+		strcpy(pbuf.id_buf, cp->service_id);
+
+		err = __ds_send(lp, &pbuf, msg_len);
+		if (err > 0)
+			cp->state = CAP_STATE_REG_SENT;
+	}
+	return 0;
+}
+
+static int ds_handshake(struct ds_info *dp, struct ds_msg_tag *pkt)
+{
+
+	if (dp->hs_state == DS_HS_START) {
+		if (pkt->type != DS_INIT_ACK)
+			goto conn_reset;
+
+		dp->hs_state = DS_HS_DONE;
+
+		return register_services(dp);
+	}
+
+	if (dp->hs_state != DS_HS_DONE)
+		goto conn_reset;
+
+	if (pkt->type == DS_REG_ACK) {
+		struct ds_reg_ack *ap = (struct ds_reg_ack *) pkt;
+		struct ds_cap_state *cp = find_cap(dp, ap->handle);
+
+		if (!cp) {
+			printk(KERN_ERR "ds-%llu: REG ACK for unknown "
+			       "handle %llx\n", dp->id, ap->handle);
+			return 0;
+		}
+		printk(KERN_INFO "ds-%llu: Registered %s service.\n",
+		       dp->id, cp->service_id);
+		cp->state = CAP_STATE_REGISTERED;
+	} else if (pkt->type == DS_REG_NACK) {
+		struct ds_reg_nack *np = (struct ds_reg_nack *) pkt;
+		struct ds_cap_state *cp = find_cap(dp, np->handle);
+
+		if (!cp) {
+			printk(KERN_ERR "ds-%llu: REG NACK for "
+			       "unknown handle %llx\n",
+			       dp->id, np->handle);
+			return 0;
+		}
+		cp->state = CAP_STATE_UNKNOWN;
+	}
+
+	return 0;
+
+conn_reset:
+	ds_conn_reset(dp);
+	return -ECONNRESET;
+}
+
+static void __send_ds_nack(struct ds_info *dp, u64 handle)
+{
+	struct ds_data_nack nack = {
+		.tag = {
+			.type = DS_NACK,
+			.len = (sizeof(struct ds_data_nack) -
+				sizeof(struct ds_msg_tag)),
+		},
+		.handle = handle,
+		.result = DS_INV_HDL,
+	};
+
+	__ds_send(dp->lp, &nack, sizeof(nack));
+}
+
+static LIST_HEAD(ds_work_list);
+static DECLARE_WAIT_QUEUE_HEAD(ds_wait);
+
+struct ds_queue_entry {
+	struct list_head		list;
+	struct ds_info			*dp;
+	int				req_len;
+	int				__pad;
+	u64				req[];
+};
+
+static void process_ds_work(void)
+{
+	struct ds_queue_entry *qp, *tmp;
+	unsigned long flags;
+	LIST_HEAD(todo);
+
+	spin_lock_irqsave(&ds_lock, flags);
+	list_splice_init(&ds_work_list, &todo);
+	spin_unlock_irqrestore(&ds_lock, flags);
+
+	list_for_each_entry_safe(qp, tmp, &todo, list) {
+		struct ds_data *dpkt = (struct ds_data *) qp->req;
+		struct ds_info *dp = qp->dp;
+		struct ds_cap_state *cp = find_cap(dp, dpkt->handle);
+		int req_len = qp->req_len;
+
+		if (!cp) {
+			printk(KERN_ERR "ds-%llu: Data for unknown "
+			       "handle %llu\n",
+			       dp->id, dpkt->handle);
+
+			spin_lock_irqsave(&ds_lock, flags);
+			__send_ds_nack(dp, dpkt->handle);
+			spin_unlock_irqrestore(&ds_lock, flags);
+		} else {
+			cp->data(dp, cp, dpkt, req_len);
+		}
+
+		list_del(&qp->list);
+		kfree(qp);
+	}
+}
+
+static int ds_thread(void *__unused)
+{
+	DEFINE_WAIT(wait);
+
+	while (1) {
+		prepare_to_wait(&ds_wait, &wait, TASK_INTERRUPTIBLE);
+		if (list_empty(&ds_work_list))
+			schedule();
+		finish_wait(&ds_wait, &wait);
+
+		if (kthread_should_stop())
+			break;
+
+		process_ds_work();
+	}
+
+	return 0;
+}
+
+static int ds_data(struct ds_info *dp, struct ds_msg_tag *pkt, int len)
+{
+	struct ds_data *dpkt = (struct ds_data *) pkt;
+	struct ds_queue_entry *qp;
+
+	qp = kmalloc(sizeof(struct ds_queue_entry) + len, GFP_ATOMIC);
+	if (!qp) {
+		__send_ds_nack(dp, dpkt->handle);
+	} else {
+		qp->dp = dp;
+		memcpy(&qp->req, pkt, len);
+		list_add_tail(&qp->list, &ds_work_list);
+		wake_up(&ds_wait);
+	}
+	return 0;
+}
+
+static void ds_up(struct ds_info *dp)
+{
+	struct ldc_channel *lp = dp->lp;
+	struct ds_ver_req req;
+	int err;
+
+	req.tag.type = DS_INIT_REQ;
+	req.tag.len = sizeof(req) - sizeof(struct ds_msg_tag);
+	req.ver.major = 1;
+	req.ver.minor = 0;
+
+	err = __ds_send(lp, &req, sizeof(req));
+	if (err > 0)
+		dp->hs_state = DS_HS_START;
+}
+
+static void ds_reset(struct ds_info *dp)
+{
+	int i;
+
+	dp->hs_state = 0;
+
+	for (i = 0; i < dp->num_ds_states; i++) {
+		struct ds_cap_state *cp = &dp->ds_states[i];
+
+		cp->state = CAP_STATE_UNKNOWN;
+	}
+}
+
+static void ds_event(void *arg, int event)
+{
+	struct ds_info *dp = arg;
+	struct ldc_channel *lp = dp->lp;
+	unsigned long flags;
+	int err;
+
+	spin_lock_irqsave(&ds_lock, flags);
+
+	if (event == LDC_EVENT_UP) {
+		ds_up(dp);
+		spin_unlock_irqrestore(&ds_lock, flags);
+		return;
+	}
+
+	if (event == LDC_EVENT_RESET) {
+		ds_reset(dp);
+		spin_unlock_irqrestore(&ds_lock, flags);
+		return;
+	}
+
+	if (event != LDC_EVENT_DATA_READY) {
+		printk(KERN_WARNING "ds-%llu: Unexpected LDC event %d\n",
+		       dp->id, event);
+		spin_unlock_irqrestore(&ds_lock, flags);
+		return;
+	}
+
+	err = 0;
+	while (1) {
+		struct ds_msg_tag *tag;
+
+		err = ldc_read(lp, dp->rcv_buf, sizeof(*tag));
+
+		if (unlikely(err < 0)) {
+			if (err == -ECONNRESET)
+				ds_conn_reset(dp);
+			break;
+		}
+		if (err == 0)
+			break;
+
+		tag = dp->rcv_buf;
+		err = ldc_read(lp, tag + 1, tag->len);
+
+		if (unlikely(err < 0)) {
+			if (err == -ECONNRESET)
+				ds_conn_reset(dp);
+			break;
+		}
+		if (err < tag->len)
+			break;
+
+		if (tag->type < DS_DATA)
+			err = ds_handshake(dp, dp->rcv_buf);
+		else
+			err = ds_data(dp, dp->rcv_buf,
+				      sizeof(*tag) + err);
+		if (err == -ECONNRESET)
+			break;
+	}
+
+	spin_unlock_irqrestore(&ds_lock, flags);
+}
+
+static int ds_probe(struct vio_dev *vdev, const struct vio_device_id *id)
+{
+	static int ds_version_printed;
+	struct ldc_channel_config ds_cfg = {
+		.event		= ds_event,
+		.mtu		= 4096,
+		.mode		= LDC_MODE_STREAM,
+	};
+	struct mdesc_handle *hp;
+	struct ldc_channel *lp;
+	struct ds_info *dp;
+	const u64 *val;
+	int err, i;
+
+	if (ds_version_printed++ == 0)
+		printk(KERN_INFO "%s", version);
+
+	dp = kzalloc(sizeof(*dp), GFP_KERNEL);
+	err = -ENOMEM;
+	if (!dp)
+		goto out_err;
+
+	hp = mdesc_grab();
+	val = mdesc_get_property(hp, vdev->mp, "id", NULL);
+	if (val)
+		dp->id = *val;
+	mdesc_release(hp);
+
+	dp->rcv_buf = kzalloc(4096, GFP_KERNEL);
+	if (!dp->rcv_buf)
+		goto out_free_dp;
+
+	dp->rcv_buf_len = 4096;
+
+	dp->ds_states = kmemdup(ds_states_template,
+				sizeof(ds_states_template), GFP_KERNEL);
+	if (!dp->ds_states)
+		goto out_free_rcv_buf;
+
+	dp->num_ds_states = ARRAY_SIZE(ds_states_template);
+
+	for (i = 0; i < dp->num_ds_states; i++)
+		dp->ds_states[i].handle = ((u64)i << 32);
+
+	ds_cfg.tx_irq = vdev->tx_irq;
+	ds_cfg.rx_irq = vdev->rx_irq;
+
+	lp = ldc_alloc(vdev->channel_id, &ds_cfg, dp, "DS");
+	if (IS_ERR(lp)) {
+		err = PTR_ERR(lp);
+		goto out_free_ds_states;
+	}
+	dp->lp = lp;
+
+	err = ldc_bind(lp);
+	if (err)
+		goto out_free_ldc;
+
+	spin_lock_irq(&ds_lock);
+	dp->next = ds_info_list;
+	ds_info_list = dp;
+	spin_unlock_irq(&ds_lock);
+
+	return err;
+
+out_free_ldc:
+	ldc_free(dp->lp);
+
+out_free_ds_states:
+	kfree(dp->ds_states);
+
+out_free_rcv_buf:
+	kfree(dp->rcv_buf);
+
+out_free_dp:
+	kfree(dp);
+
+out_err:
+	return err;
+}
+
+static int ds_remove(struct vio_dev *vdev)
+{
+	return 0;
+}
+
+static const struct vio_device_id ds_match[] = {
+	{
+		.type = "domain-services-port",
+	},
+	{},
+};
+
+static struct vio_driver ds_driver = {
+	.id_table	= ds_match,
+	.probe		= ds_probe,
+	.remove		= ds_remove,
+	.name		= "ds",
+};
+
+static int __init ds_init(void)
+{
+	unsigned long hv_ret, major, minor;
+
+	if (tlb_type == hypervisor) {
+		hv_ret = sun4v_get_version(HV_GRP_REBOOT_DATA, &major, &minor);
+		if (hv_ret == HV_EOK) {
+			pr_info("SUN4V: Reboot data supported (maj=%lu,min=%lu).\n",
+				major, minor);
+			reboot_data_supported = 1;
+		}
+	}
+	kthread_run(ds_thread, NULL, "kldomd");
+
+	return vio_register_driver(&ds_driver);
+}
+
+fs_initcall(ds_init);