forked from luck/tmp_suning_uos_patched
b3e13fbeb9
There is a special domain services capability for setting variables in the OBP options node. Guests don't have permanent store for the OBP variables like a normal system, so they are instead maintained in the LDOM control node or in the SC. Signed-off-by: David S. Miller <davem@davemloft.net>
808 lines
15 KiB
C
808 lines
15 KiB
C
/* ds.c: Domain Services driver for Logical Domains
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*
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* Copyright (C) 2007 David S. Miller <davem@davemloft.net>
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/slab.h>
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#include <linux/sched.h>
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#include <linux/delay.h>
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#include <linux/mutex.h>
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#include <asm/ldc.h>
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#include <asm/vio.h>
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#include <asm/power.h>
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#include <asm/mdesc.h>
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#define DRV_MODULE_NAME "ds"
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#define PFX DRV_MODULE_NAME ": "
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#define DRV_MODULE_VERSION "1.0"
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#define DRV_MODULE_RELDATE "Jul 11, 2007"
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static char version[] __devinitdata =
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DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
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MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
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MODULE_DESCRIPTION("Sun LDOM domain services driver");
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MODULE_LICENSE("GPL");
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MODULE_VERSION(DRV_MODULE_VERSION);
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struct ds_msg_tag {
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__u32 type;
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#define DS_INIT_REQ 0x00
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#define DS_INIT_ACK 0x01
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#define DS_INIT_NACK 0x02
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#define DS_REG_REQ 0x03
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#define DS_REG_ACK 0x04
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#define DS_REG_NACK 0x05
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#define DS_UNREG_REQ 0x06
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#define DS_UNREG_ACK 0x07
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#define DS_UNREG_NACK 0x08
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#define DS_DATA 0x09
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#define DS_NACK 0x0a
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__u32 len;
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};
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/* Result codes */
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#define DS_OK 0x00
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#define DS_REG_VER_NACK 0x01
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#define DS_REG_DUP 0x02
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#define DS_INV_HDL 0x03
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#define DS_TYPE_UNKNOWN 0x04
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struct ds_version {
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__u16 major;
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__u16 minor;
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};
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struct ds_ver_req {
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struct ds_msg_tag tag;
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struct ds_version ver;
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};
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struct ds_ver_ack {
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struct ds_msg_tag tag;
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__u16 minor;
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};
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struct ds_ver_nack {
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struct ds_msg_tag tag;
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__u16 major;
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};
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struct ds_reg_req {
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struct ds_msg_tag tag;
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__u64 handle;
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__u16 major;
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__u16 minor;
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char svc_id[0];
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};
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struct ds_reg_ack {
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struct ds_msg_tag tag;
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__u64 handle;
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__u16 minor;
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};
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struct ds_reg_nack {
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struct ds_msg_tag tag;
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__u64 handle;
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__u16 major;
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};
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struct ds_unreg_req {
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struct ds_msg_tag tag;
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__u64 handle;
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};
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struct ds_unreg_ack {
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struct ds_msg_tag tag;
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__u64 handle;
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};
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struct ds_unreg_nack {
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struct ds_msg_tag tag;
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__u64 handle;
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};
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struct ds_data {
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struct ds_msg_tag tag;
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__u64 handle;
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};
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struct ds_data_nack {
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struct ds_msg_tag tag;
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__u64 handle;
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__u64 result;
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};
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struct ds_cap_state {
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__u64 handle;
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void (*data)(struct ldc_channel *lp,
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struct ds_cap_state *dp,
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void *buf, int len);
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const char *service_id;
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u8 state;
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#define CAP_STATE_UNKNOWN 0x00
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#define CAP_STATE_REG_SENT 0x01
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#define CAP_STATE_REGISTERED 0x02
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};
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static int ds_send(struct ldc_channel *lp, void *data, int len)
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{
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int err, limit = 1000;
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err = -EINVAL;
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while (limit-- > 0) {
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err = ldc_write(lp, data, len);
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if (!err || (err != -EAGAIN))
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break;
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udelay(1);
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}
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return err;
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}
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struct ds_md_update_req {
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__u64 req_num;
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};
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struct ds_md_update_res {
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__u64 req_num;
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__u32 result;
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};
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static void md_update_data(struct ldc_channel *lp,
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struct ds_cap_state *dp,
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void *buf, int len)
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{
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struct ds_data *dpkt = buf;
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struct ds_md_update_req *rp;
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struct {
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struct ds_data data;
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struct ds_md_update_res res;
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} pkt;
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rp = (struct ds_md_update_req *) (dpkt + 1);
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printk(KERN_INFO PFX "Machine description update.\n");
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memset(&pkt, 0, sizeof(pkt));
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pkt.data.tag.type = DS_DATA;
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pkt.data.tag.len = sizeof(pkt) - sizeof(struct ds_msg_tag);
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pkt.data.handle = dp->handle;
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pkt.res.req_num = rp->req_num;
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pkt.res.result = DS_OK;
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ds_send(lp, &pkt, sizeof(pkt));
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mdesc_update();
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}
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struct ds_shutdown_req {
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__u64 req_num;
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__u32 ms_delay;
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};
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struct ds_shutdown_res {
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__u64 req_num;
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__u32 result;
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char reason[1];
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};
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static void domain_shutdown_data(struct ldc_channel *lp,
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struct ds_cap_state *dp,
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void *buf, int len)
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{
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struct ds_data *dpkt = buf;
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struct ds_shutdown_req *rp;
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struct {
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struct ds_data data;
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struct ds_shutdown_res res;
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} pkt;
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rp = (struct ds_shutdown_req *) (dpkt + 1);
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printk(KERN_ALERT PFX "Shutdown request from "
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"LDOM manager received.\n");
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memset(&pkt, 0, sizeof(pkt));
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pkt.data.tag.type = DS_DATA;
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pkt.data.tag.len = sizeof(pkt) - sizeof(struct ds_msg_tag);
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pkt.data.handle = dp->handle;
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pkt.res.req_num = rp->req_num;
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pkt.res.result = DS_OK;
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pkt.res.reason[0] = 0;
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ds_send(lp, &pkt, sizeof(pkt));
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wake_up_powerd();
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}
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struct ds_panic_req {
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__u64 req_num;
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};
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struct ds_panic_res {
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__u64 req_num;
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__u32 result;
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char reason[1];
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};
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static void domain_panic_data(struct ldc_channel *lp,
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struct ds_cap_state *dp,
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void *buf, int len)
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{
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struct ds_data *dpkt = buf;
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struct ds_panic_req *rp;
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struct {
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struct ds_data data;
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struct ds_panic_res res;
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} pkt;
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rp = (struct ds_panic_req *) (dpkt + 1);
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printk(KERN_ALERT PFX "Panic request from "
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"LDOM manager received.\n");
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memset(&pkt, 0, sizeof(pkt));
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pkt.data.tag.type = DS_DATA;
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pkt.data.tag.len = sizeof(pkt) - sizeof(struct ds_msg_tag);
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pkt.data.handle = dp->handle;
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pkt.res.req_num = rp->req_num;
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pkt.res.result = DS_OK;
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pkt.res.reason[0] = 0;
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ds_send(lp, &pkt, sizeof(pkt));
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panic("PANIC requested by LDOM manager.");
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}
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struct ds_cpu_tag {
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__u64 req_num;
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__u32 type;
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#define DS_CPU_CONFIGURE 0x43
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#define DS_CPU_UNCONFIGURE 0x55
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#define DS_CPU_FORCE_UNCONFIGURE 0x46
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#define DS_CPU_STATUS 0x53
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/* Responses */
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#define DS_CPU_OK 0x6f
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#define DS_CPU_ERROR 0x65
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__u32 num_records;
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};
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struct ds_cpu_record {
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__u32 cpu_id;
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};
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static void dr_cpu_data(struct ldc_channel *lp,
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struct ds_cap_state *dp,
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void *buf, int len)
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{
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struct ds_data *dpkt = buf;
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struct ds_cpu_tag *rp;
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rp = (struct ds_cpu_tag *) (dpkt + 1);
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printk(KERN_ERR PFX "CPU REQ [%lx:%x], len=%d\n",
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rp->req_num, rp->type, len);
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}
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struct ds_pri_msg {
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__u64 req_num;
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__u64 type;
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#define DS_PRI_REQUEST 0x00
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#define DS_PRI_DATA 0x01
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#define DS_PRI_UPDATE 0x02
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};
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static void ds_pri_data(struct ldc_channel *lp,
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struct ds_cap_state *dp,
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void *buf, int len)
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{
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struct ds_data *dpkt = buf;
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struct ds_pri_msg *rp;
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rp = (struct ds_pri_msg *) (dpkt + 1);
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printk(KERN_INFO PFX "PRI REQ [%lx:%lx], len=%d\n",
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rp->req_num, rp->type, len);
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}
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struct ds_var_hdr {
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__u32 type;
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#define DS_VAR_SET_REQ 0x00
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#define DS_VAR_DELETE_REQ 0x01
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#define DS_VAR_SET_RESP 0x02
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#define DS_VAR_DELETE_RESP 0x03
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};
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struct ds_var_set_msg {
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struct ds_var_hdr hdr;
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char name_and_value[0];
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};
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struct ds_var_delete_msg {
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struct ds_var_hdr hdr;
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char name[0];
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};
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struct ds_var_resp {
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struct ds_var_hdr hdr;
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__u32 result;
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#define DS_VAR_SUCCESS 0x00
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#define DS_VAR_NO_SPACE 0x01
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#define DS_VAR_INVALID_VAR 0x02
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#define DS_VAR_INVALID_VAL 0x03
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#define DS_VAR_NOT_PRESENT 0x04
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};
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static DEFINE_MUTEX(ds_var_mutex);
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static int ds_var_doorbell;
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static int ds_var_response;
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static void ds_var_data(struct ldc_channel *lp,
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struct ds_cap_state *dp,
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void *buf, int len)
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{
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struct ds_data *dpkt = buf;
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struct ds_var_resp *rp;
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rp = (struct ds_var_resp *) (dpkt + 1);
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if (rp->hdr.type != DS_VAR_SET_RESP &&
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rp->hdr.type != DS_VAR_DELETE_RESP)
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return;
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ds_var_response = rp->result;
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wmb();
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ds_var_doorbell = 1;
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}
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struct ds_cap_state ds_states[] = {
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{
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.service_id = "md-update",
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.data = md_update_data,
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},
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{
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.service_id = "domain-shutdown",
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.data = domain_shutdown_data,
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},
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{
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.service_id = "domain-panic",
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.data = domain_panic_data,
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},
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{
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.service_id = "dr-cpu",
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.data = dr_cpu_data,
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},
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{
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.service_id = "pri",
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.data = ds_pri_data,
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},
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{
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.service_id = "var-config",
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.data = ds_var_data,
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},
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{
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.service_id = "var-config-backup",
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.data = ds_var_data,
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},
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};
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static DEFINE_SPINLOCK(ds_lock);
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struct ds_info {
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struct ldc_channel *lp;
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u8 hs_state;
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#define DS_HS_START 0x01
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#define DS_HS_DONE 0x02
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void *rcv_buf;
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int rcv_buf_len;
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};
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static struct ds_info *ds_info;
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static struct ds_cap_state *find_cap(u64 handle)
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{
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unsigned int index = handle >> 32;
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if (index >= ARRAY_SIZE(ds_states))
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return NULL;
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return &ds_states[index];
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}
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static struct ds_cap_state *find_cap_by_string(const char *name)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(ds_states); i++) {
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if (strcmp(ds_states[i].service_id, name))
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continue;
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return &ds_states[i];
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}
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return NULL;
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}
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void ldom_set_var(const char *var, const char *value)
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{
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struct ds_info *dp = ds_info;
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struct ds_cap_state *cp;
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cp = find_cap_by_string("var-config");
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if (cp->state != CAP_STATE_REGISTERED)
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cp = find_cap_by_string("var-config-backup");
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if (cp->state == CAP_STATE_REGISTERED) {
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union {
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struct {
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struct ds_data data;
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struct ds_var_set_msg msg;
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} header;
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char all[512];
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} pkt;
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unsigned long flags;
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char *base, *p;
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int msg_len, loops;
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memset(&pkt, 0, sizeof(pkt));
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pkt.header.data.tag.type = DS_DATA;
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pkt.header.data.handle = cp->handle;
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pkt.header.msg.hdr.type = DS_VAR_SET_REQ;
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base = p = &pkt.header.msg.name_and_value[0];
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strcpy(p, var);
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p += strlen(var) + 1;
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strcpy(p, value);
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p += strlen(value) + 1;
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msg_len = (sizeof(struct ds_data) +
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sizeof(struct ds_var_set_msg) +
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(p - base));
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msg_len = (msg_len + 3) & ~3;
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pkt.header.data.tag.len = msg_len - sizeof(struct ds_msg_tag);
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mutex_lock(&ds_var_mutex);
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spin_lock_irqsave(&ds_lock, flags);
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ds_var_doorbell = 0;
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ds_var_response = -1;
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ds_send(dp->lp, &pkt, msg_len);
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spin_unlock_irqrestore(&ds_lock, flags);
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loops = 1000;
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while (ds_var_doorbell == 0) {
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if (loops-- < 0)
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break;
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barrier();
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udelay(100);
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}
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mutex_unlock(&ds_var_mutex);
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if (ds_var_doorbell == 0 ||
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ds_var_response != DS_VAR_SUCCESS)
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printk(KERN_ERR PFX "var-config [%s:%s] "
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"failed, response(%d).\n",
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var, value,
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ds_var_response);
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} else {
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printk(KERN_ERR PFX "var-config not registered so "
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"could not set (%s) variable to (%s).\n",
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var, value);
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}
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}
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void ldom_reboot(const char *boot_command)
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{
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/* Don't bother with any of this if the boot_command
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* is empty.
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*/
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if (boot_command && strlen(boot_command)) {
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char full_boot_str[256];
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strcpy(full_boot_str, "boot ");
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strcpy(full_boot_str + strlen("boot "), boot_command);
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ldom_set_var("reboot-command", full_boot_str);
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}
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sun4v_mach_sir();
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}
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static void ds_conn_reset(struct ds_info *dp)
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{
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printk(KERN_ERR PFX "ds_conn_reset() from %p\n",
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__builtin_return_address(0));
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}
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static int register_services(struct ds_info *dp)
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{
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struct ldc_channel *lp = dp->lp;
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int i;
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for (i = 0; i < ARRAY_SIZE(ds_states); i++) {
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struct {
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struct ds_reg_req req;
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u8 id_buf[256];
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} pbuf;
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struct ds_cap_state *cp = &ds_states[i];
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int err, msg_len;
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u64 new_count;
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if (cp->state == CAP_STATE_REGISTERED)
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continue;
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new_count = sched_clock() & 0xffffffff;
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cp->handle = ((u64) i << 32) | new_count;
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msg_len = (sizeof(struct ds_reg_req) +
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strlen(cp->service_id));
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memset(&pbuf, 0, sizeof(pbuf));
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pbuf.req.tag.type = DS_REG_REQ;
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pbuf.req.tag.len = (msg_len - sizeof(struct ds_msg_tag));
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pbuf.req.handle = cp->handle;
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pbuf.req.major = 1;
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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);
|