Commit e450992d authored by David S. Miller's avatar David S. Miller
Browse files

[SPARC64]: Initial domain-services driver.


Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 13077d80
......@@ -26,7 +26,7 @@ obj-$(CONFIG_MODULES) += module.o
obj-$(CONFIG_US3_FREQ) += us3_cpufreq.o
obj-$(CONFIG_US2E_FREQ) += us2e_cpufreq.o
obj-$(CONFIG_KPROBES) += kprobes.o
obj-$(CONFIG_SUN_LDOMS) += ldc.o vio.o viohs.o
obj-$(CONFIG_SUN_LDOMS) += ldc.o vio.o viohs.o ds.o
obj-$(CONFIG_AUDIT) += audit.o
obj-$(CONFIG_AUDIT)$(CONFIG_SPARC32_COMPAT) += compat_audit.o
obj-y += $(obj-yy)
......
/* 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 <asm/ldc.h>
#include <asm/vio.h>
#include <asm/power.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_ERR PFX "MD update REQ [%lx] len=%d\n",
rp->req_num, len);
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));
}
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_ERR PFX "Panic REQ [%lx], len=%d\n",
rp->req_num, len);
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_ERR PFX "PRI REQ [%lx:%lx], len=%d\n",
rp->req_num, rp->type, len);
}
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,
},
};
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 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 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 mdesc_node *endp;
struct ldc_channel_config ds_cfg = {
.event = ds_event,
.mtu = 4096,
.mode = LDC_MODE_STREAM,
};
struct ldc_channel *lp;
struct ds_info *dp;
const u64 *chan_id;
int err;
if (ds_version_printed++ == 0)
printk(KERN_INFO "%s", version);
endp = vio_find_endpoint(vdev);
if (!endp)
return -ENODEV;
chan_id = md_get_property(endp, "id", NULL);
if (!chan_id)
return -ENODEV;
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 = endp->irqs[0];
ds_cfg.rx_irq = endp->irqs[1];
lp = ldc_alloc(*chan_id, &ds_cfg, dp);
if (IS_ERR(lp)) {
err = PTR_ERR(lp);
goto out_free_rcv_buf;
}
dp->lp = lp;
err = ldc_bind(lp);
if (err)
goto out_free_ldc;
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;