diff options
Diffstat (limited to 'arch/sparc64/kernel/ds.c')
| -rw-r--r-- | arch/sparc64/kernel/ds.c | 1244 |
1 files changed, 0 insertions, 1244 deletions
diff --git a/arch/sparc64/kernel/ds.c b/arch/sparc64/kernel/ds.c deleted file mode 100644 index f52e0534d91..00000000000 --- a/arch/sparc64/kernel/ds.c +++ /dev/null @@ -1,1244 +0,0 @@ -/* 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); |