+++ /dev/null
-/* 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/delay.h>
-#include <linux/mutex.h>
-#include <linux/kthread.h>
-#include <linux/reboot.h>
-#include <linux/cpu.h>
-
-#include <asm/ldc.h>
-#include <asm/vio.h>
-#include <asm/mdesc.h>
-#include <asm/head.h>
-#include <asm/irq.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[] __devinitdata =
- 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-%lu: 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-%lu: 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-%lu: 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_mask(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 __cpuinit 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 = cpus_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_fill_in_cpu_data(*mask);
-
- for_each_cpu_mask(cpu, *mask) {
- int err;
-
- printk(KERN_INFO "ds-%lu: 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-%lu: 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 = cpus_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_mask(cpu, *mask) {
- int err;
-
- printk(KERN_INFO "ds-%lu: 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 __cpuinit 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);
-
- cpus_clear(mask);
- for (i = 0; i < tag->num_records; i++) {
- if (cpu_list[i] == CPU_SENTINEL)
- continue;
-
- if (cpu_list[i] < NR_CPUS)
- cpu_set(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-%lu: PRI REQ [%lx:%lx], 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;
-
- 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-%lu: 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);
- }
-}
-
-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)) {
- char full_boot_str[256];
-
- strcpy(full_boot_str, "boot ");
- strcpy(full_boot_str + strlen("boot "), boot_command);
-
- 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-%lu: ds_conn_reset() from %p\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.req.svc_id, 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-%lu: REG ACK for unknown "
- "handle %lx\n", dp->id, ap->handle);
- return 0;
- }
- printk(KERN_INFO "ds-%lu: 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-%lu: REG NACK for "
- "unknown handle %lx\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-%lu: Data for unknown "
- "handle %lu\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-%lu: 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 __devinit 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 = kzalloc(sizeof(ds_states_template),
- GFP_KERNEL);
- if (!dp->ds_states)
- goto out_free_rcv_buf;
-
- memcpy(dp->ds_states, ds_states_template,
- sizeof(ds_states_template));
- 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);
- if (IS_ERR(lp)) {
- err = PTR_ERR(lp);
- goto out_free_ds_states;
- }
- dp->lp = lp;
-
- err = ldc_bind(lp, "DS");
- 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 struct vio_device_id __initdata ds_match[] = {
- {
- .type = "domain-services-port",
- },
- {},
-};
-
-static struct vio_driver ds_driver = {
- .id_table = ds_match,
- .probe = ds_probe,
- .remove = ds_remove,
- .driver = {
- .name = "ds",
- .owner = THIS_MODULE,
- }
-};
-
-static int __init ds_init(void)
-{
- kthread_run(ds_thread, NULL, "kldomd");
-
- return vio_register_driver(&ds_driver);
-}
-
-subsys_initcall(ds_init);
git.samba.org / sfrench / cifs-2.6.git / blobdiff