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// SPDX-License-Identifier: GPL-2.0+
/*
* ipmi_poweroff.c
*
* MontaVista IPMI Poweroff extension to sys_reboot
*
* Author: MontaVista Software, Inc.
* Steven Dake <sdake@mvista.com>
* Corey Minyard <cminyard@mvista.com>
* source@mvista.com
*
* Copyright 2002,2004 MontaVista Software Inc.
*/
#define pr_fmt(fmt) "IPMI poweroff: " fmt
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/proc_fs.h>
#include <linux/string.h>
#include <linux/completion.h>
#include <linux/pm.h>
#include <linux/kdev_t.h>
#include <linux/ipmi.h>
#include <linux/ipmi_smi.h>
static void ipmi_po_smi_gone(int if_num);
static void ipmi_po_new_smi(int if_num, struct device *device);
/* Definitions for controlling power off (if the system supports it). It
* conveniently matches the IPMI chassis control values. */
#define IPMI_CHASSIS_POWER_DOWN 0 /* power down, the default. */
#define IPMI_CHASSIS_POWER_CYCLE 0x02 /* power cycle */
/* the IPMI data command */
static int poweroff_powercycle;
/* Which interface to use, -1 means the first we see. */
static int ifnum_to_use = -1;
/* Our local state. */
static int ready;
static struct ipmi_user *ipmi_user;
static int ipmi_ifnum;
static void (*specific_poweroff_func)(struct ipmi_user *user);
/* Holds the old poweroff function so we can restore it on removal. */
static void (*old_poweroff_func)(void);
static int set_param_ifnum(const char *val, const struct kernel_param *kp)
{
int rv = param_set_int(val, kp);
if (rv)
return rv;
if ((ifnum_to_use < 0) || (ifnum_to_use == ipmi_ifnum))
return 0;
ipmi_po_smi_gone(ipmi_ifnum);
ipmi_po_new_smi(ifnum_to_use, NULL);
return 0;
}
module_param_call(ifnum_to_use, set_param_ifnum, param_get_int,
&ifnum_to_use, 0644);
MODULE_PARM_DESC(ifnum_to_use, "The interface number to use for the watchdog "
"timer. Setting to -1 defaults to the first registered "
"interface");
/* parameter definition to allow user to flag power cycle */
module_param(poweroff_powercycle, int, 0644);
MODULE_PARM_DESC(poweroff_powercycle,
" Set to non-zero to enable power cycle instead of power"
" down. Power cycle is contingent on hardware support,"
" otherwise it defaults back to power down.");
/* Stuff from the get device id command. */
static unsigned int mfg_id;
static unsigned int prod_id;
static unsigned char capabilities;
static unsigned char ipmi_version;
/*
* We use our own messages for this operation, we don't let the system
* allocate them, since we may be in a panic situation. The whole
* thing is single-threaded, anyway, so multiple messages are not
* required.
*/
static atomic_t dummy_count = ATOMIC_INIT(0);
static void dummy_smi_free(struct ipmi_smi_msg *msg)
{
atomic_dec(&dummy_count);
}
static void dummy_recv_free(struct ipmi_recv_msg *msg)
{
atomic_dec(&dummy_count);
}
static struct ipmi_smi_msg halt_smi_msg = {
.done = dummy_smi_free
};
static struct ipmi_recv_msg halt_recv_msg = {
.done = dummy_recv_free
};
/*
* Code to send a message and wait for the response.
*/
static void receive_handler(struct ipmi_recv_msg *recv_msg, void *handler_data)
{
struct completion *comp = recv_msg->user_msg_data;
if (comp)
complete(comp);
}
static const struct ipmi_user_hndl ipmi_poweroff_handler = {
.ipmi_recv_hndl = receive_handler
};
static int ipmi_request_wait_for_response(struct ipmi_user *user,
struct ipmi_addr *addr,
struct kernel_ipmi_msg *send_msg)
{
int rv;
struct completion comp;
init_completion(&comp);
rv = ipmi_request_supply_msgs(user, addr, 0, send_msg, &comp,
&halt_smi_msg, &halt_recv_msg, 0);
if (rv)
return rv;
wait_for_completion(&comp);
return halt_recv_msg.msg.data[0];
}
/* Wait for message to complete, spinning. */
static int ipmi_request_in_rc_mode(struct ipmi_user *user,
struct ipmi_addr *addr,
struct kernel_ipmi_msg *send_msg)
{
int rv;
atomic_set(&dummy_count, 2);
rv = ipmi_request_supply_msgs(user, addr, 0, send_msg, NULL,
&halt_smi_msg, &halt_recv_msg, 0);
if (rv) {
atomic_set(&dummy_count, 0);
return rv;
}
/*
* Spin until our message is done.
*/
while (atomic_read(&dummy_count) > 0) {
ipmi_poll_interface(user);
cpu_relax();
}
return halt_recv_msg.msg.data[0];
}
/*
* ATCA Support
*/
#define IPMI_NETFN_ATCA 0x2c
#define IPMI_ATCA_SET_POWER_CMD 0x11
#define IPMI_ATCA_GET_ADDR_INFO_CMD 0x01
#define IPMI_PICMG_ID 0
#define IPMI_NETFN_OEM 0x2e
#define IPMI_ATCA_PPS_GRACEFUL_RESTART 0x11
#define IPMI_ATCA_PPS_IANA "\x00\x40\x0A"
#define IPMI_MOTOROLA_MANUFACTURER_ID 0x0000A1
#define IPMI_MOTOROLA_PPS_IPMC_PRODUCT_ID 0x0051
static void (*atca_oem_poweroff_hook)(struct ipmi_user *user);
static void pps_poweroff_atca(struct ipmi_user *user)
{
struct ipmi_system_interface_addr smi_addr;
struct kernel_ipmi_msg send_msg;
int rv;
/*
* Configure IPMI address for local access
*/
smi_addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
smi_addr.channel = IPMI_BMC_CHANNEL;
smi_addr.lun = 0;
pr_info("PPS powerdown hook used\n");
send_msg.netfn = IPMI_NETFN_OEM;
send_msg.cmd = IPMI_ATCA_PPS_GRACEFUL_RESTART;
send_msg.data = IPMI_ATCA_PPS_IANA;
send_msg.data_len = 3;
rv = ipmi_request_in_rc_mode(user,
(struct ipmi_addr *) &smi_addr,
&send_msg);
if (rv && rv != IPMI_UNKNOWN_ERR_COMPLETION_CODE)
pr_err("Unable to send ATCA, IPMI error 0x%x\n", rv);
return;
}
static int ipmi_atca_detect(struct ipmi_user *user)
{
struct ipmi_system_interface_addr smi_addr;
struct kernel_ipmi_msg send_msg;
int rv;
unsigned char data[1];
/*
* Configure IPMI address for local access
*/
smi_addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
smi_addr.channel = IPMI_BMC_CHANNEL;
smi_addr.lun = 0;
/*
* Use get address info to check and see if we are ATCA
*/
send_msg.netfn = IPMI_NETFN_ATCA;
send_msg.cmd = IPMI_ATCA_GET_ADDR_INFO_CMD;
data[0] = IPMI_PICMG_ID;
send_msg.data = data;
send_msg.data_len = sizeof(data);
rv = ipmi_request_wait_for_response(user,
(struct ipmi_addr *) &smi_addr,
&send_msg);
pr_info("ATCA Detect mfg 0x%X prod 0x%X\n"
|