v4.19.13 snapshot.
diff --git a/arch/sparc/kernel/ds.c b/arch/sparc/kernel/ds.c
new file mode 100644
index 0000000..f87265a
--- /dev/null
+++ b/arch/sparc/kernel/ds.c
@@ -0,0 +1,1274 @@
+/* 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[0];
+};
+
+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 = cpu_up(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 = cpu_down(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[0];
+};
+
+struct ds_var_delete_msg {
+ struct ds_var_hdr hdr;
+ char name[0];
+};
+
+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 %pf\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[0];
+};
+
+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);