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WSL2-Linux-Kernel
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WSL2-Linux-Kernel/arch/sparc/kernel/ds.c

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