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- /* ds.c: Domain Services driver for Logical Domains
- *
- * Copyright (C) 2007 David S. Miller <davem@davemloft.net>
- */
- #include <linux/kernel.h>
- #include <linux/module.h>
- #include <linux/types.h>
- #include <linux/module.h>
- #include <linux/string.h>
- #include <linux/slab.h>
- #include <linux/sched.h>
- #include <linux/delay.h>
- #include <linux/mutex.h>
- #include <asm/ldc.h>
- #include <asm/vio.h>
- #include <asm/power.h>
- #include <asm/mdesc.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_cap_state {
- __u64 handle;
- void (*data)(struct ldc_channel *lp,
- struct ds_cap_state *dp,
- 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 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;
- }
- struct ds_md_update_req {
- __u64 req_num;
- };
- struct ds_md_update_res {
- __u64 req_num;
- __u32 result;
- };
- static void md_update_data(struct ldc_channel *lp,
- struct ds_cap_state *dp,
- void *buf, int len)
- {
- 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 PFX "Machine description update.\n");
- 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 = dp->handle;
- pkt.res.req_num = rp->req_num;
- pkt.res.result = DS_OK;
- ds_send(lp, &pkt, sizeof(pkt));
- mdesc_update();
- }
- 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 ldc_channel *lp,
- struct ds_cap_state *dp,
- void *buf, int len)
- {
- 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 PFX "Shutdown request from "
- "LDOM manager received.\n");
- 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 = dp->handle;
- pkt.res.req_num = rp->req_num;
- pkt.res.result = DS_OK;
- pkt.res.reason[0] = 0;
- ds_send(lp, &pkt, sizeof(pkt));
- wake_up_powerd();
- }
- 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 ldc_channel *lp,
- struct ds_cap_state *dp,
- void *buf, int len)
- {
- 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 PFX "Panic request from "
- "LDOM manager received.\n");
- 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 = dp->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.");
- }
- struct ds_cpu_tag {
- __u64 req_num;
- __u32 type;
- #define DS_CPU_CONFIGURE 0x43
- #define DS_CPU_UNCONFIGURE 0x55
- #define DS_CPU_FORCE_UNCONFIGURE 0x46
- #define DS_CPU_STATUS 0x53
- /* Responses */
- #define DS_CPU_OK 0x6f
- #define DS_CPU_ERROR 0x65
- __u32 num_records;
- };
- struct ds_cpu_record {
- __u32 cpu_id;
- };
- static void dr_cpu_data(struct ldc_channel *lp,
- struct ds_cap_state *dp,
- void *buf, int len)
- {
- struct ds_data *dpkt = buf;
- struct ds_cpu_tag *rp;
- rp = (struct ds_cpu_tag *) (dpkt + 1);
- printk(KERN_ERR PFX "CPU REQ [%lx:%x], len=%d\n",
- rp->req_num, rp->type, len);
- }
- 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 ldc_channel *lp,
- struct ds_cap_state *dp,
- void *buf, int len)
- {
- struct ds_data *dpkt = buf;
- struct ds_pri_msg *rp;
- rp = (struct ds_pri_msg *) (dpkt + 1);
- printk(KERN_INFO PFX "PRI REQ [%lx:%lx], len=%d\n",
- 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 ldc_channel *lp,
- struct ds_cap_state *dp,
- 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;
- }
- struct ds_cap_state ds_states[] = {
- {
- .service_id = "md-update",
- .data = md_update_data,
- },
- {
- .service_id = "domain-shutdown",
- .data = domain_shutdown_data,
- },
- {
- .service_id = "domain-panic",
- .data = domain_panic_data,
- },
- {
- .service_id = "dr-cpu",
- .data = dr_cpu_data,
- },
- {
- .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
- void *rcv_buf;
- int rcv_buf_len;
- };
- static struct ds_info *ds_info;
- static struct ds_cap_state *find_cap(u64 handle)
- {
- unsigned int index = handle >> 32;
- if (index >= ARRAY_SIZE(ds_states))
- return NULL;
- return &ds_states[index];
- }
- static struct ds_cap_state *find_cap_by_string(const char *name)
- {
- int i;
- for (i = 0; i < ARRAY_SIZE(ds_states); i++) {
- if (strcmp(ds_states[i].service_id, name))
- continue;
- return &ds_states[i];
- }
- return NULL;
- }
- void ldom_set_var(const char *var, const char *value)
- {
- struct ds_info *dp = ds_info;
- struct ds_cap_state *cp;
- cp = find_cap_by_string("var-config");
- if (cp->state != CAP_STATE_REGISTERED)
- cp = find_cap_by_string("var-config-backup");
- if (cp->state == CAP_STATE_REGISTERED) {
- union {
- struct {
- struct ds_data data;
- struct ds_var_set_msg msg;
- } header;
- char all[512];
- } pkt;
- unsigned long flags;
- 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 PFX "var-config [%s:%s] "
- "failed, response(%d).\n",
- 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();
- }
- static void ds_conn_reset(struct ds_info *dp)
- {
- printk(KERN_ERR PFX "ds_conn_reset() from %p\n",
- __builtin_return_address(0));
- }
- static int register_services(struct ds_info *dp)
- {
- struct ldc_channel *lp = dp->lp;
- int i;
- for (i = 0; i < ARRAY_SIZE(ds_states); i++) {
- struct {
- struct ds_reg_req req;
- u8 id_buf[256];
- } pbuf;
- struct ds_cap_state *cp = &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(ap->handle);
- if (!cp) {
- printk(KERN_ERR PFX "REG ACK for unknown handle %lx\n",
- ap->handle);
- return 0;
- }
- printk(KERN_INFO PFX "Registered %s service.\n",
- 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(np->handle);
- if (!cp) {
- printk(KERN_ERR PFX "REG NACK for "
- "unknown handle %lx\n",
- np->handle);
- return 0;
- }
- printk(KERN_ERR PFX "Could not register %s service\n",
- cp->service_id);
- cp->state = CAP_STATE_UNKNOWN;
- }
- return 0;
- conn_reset:
- ds_conn_reset(dp);
- return -ECONNRESET;
- }
- 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_cap_state *cp = find_cap(dpkt->handle);
- if (!cp) {
- struct ds_data_nack nack = {
- .tag = {
- .type = DS_NACK,
- .len = (sizeof(struct ds_data_nack) -
- sizeof(struct ds_msg_tag)),
- },
- .handle = dpkt->handle,
- .result = DS_INV_HDL,
- };
- printk(KERN_ERR PFX "Data for unknown handle %lu\n",
- dpkt->handle);
- ds_send(dp->lp, &nack, sizeof(nack));
- } else {
- cp->data(dp->lp, cp, dpkt, len);
- }
- 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_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_DATA_READY) {
- printk(KERN_WARNING PFX "Unexpected LDC event %d\n", 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 ldc_channel *lp;
- struct ds_info *dp;
- int err;
- if (ds_version_printed++ == 0)
- printk(KERN_INFO "%s", version);
- dp = kzalloc(sizeof(*dp), GFP_KERNEL);
- err = -ENOMEM;
- if (!dp)
- goto out_err;
- dp->rcv_buf = kzalloc(4096, GFP_KERNEL);
- if (!dp->rcv_buf)
- goto out_free_dp;
- dp->rcv_buf_len = 4096;
- 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_rcv_buf;
- }
- dp->lp = lp;
- err = ldc_bind(lp, "DS");
- if (err)
- goto out_free_ldc;
- ds_info = dp;
- start_powerd();
- return err;
- out_free_ldc:
- ldc_free(dp->lp);
- 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 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)
- {
- int i;
- for (i = 0; i < ARRAY_SIZE(ds_states); i++)
- ds_states[i].handle = ((u64)i << 32);
- return vio_register_driver(&ds_driver);
- }
- subsys_initcall(ds_init);
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