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qemu-patch-raspberry4/hw/ipmi/ipmi_bmc_extern.c
Corey Minyard 53d34b8c1b ipmi: disable IRQ and ATN on an external disconnect 
Otherwise there's no way to clear them without an external command,
and it could lock the OS in the VM if they were stuck.

Signed-off-by: Corey Minyard <cminyard@mvista.com>
2018-01-30 15:52:53 -06:00

546 lines
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/*
* IPMI BMC external connection
*
* Copyright (c) 2015 Corey Minyard, MontaVista Software, LLC
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
/*
* This is designed to connect with OpenIPMI's lanserv serial interface
* using the "VM" connection type. See that for details.
*/
#include "qemu/osdep.h"
#include "qemu/error-report.h"
#include "qapi/error.h"
#include "qemu/timer.h"
#include "chardev/char-fe.h"
#include "sysemu/sysemu.h"
#include "hw/ipmi/ipmi.h"
#define VM_MSG_CHAR 0xA0 /* Marks end of message */
#define VM_CMD_CHAR 0xA1 /* Marks end of a command */
#define VM_ESCAPE_CHAR 0xAA /* Set bit 4 from the next byte to 0 */
#define VM_PROTOCOL_VERSION 1
#define VM_CMD_VERSION 0xff /* A version number byte follows */
#define VM_CMD_NOATTN 0x00
#define VM_CMD_ATTN 0x01
#define VM_CMD_ATTN_IRQ 0x02
#define VM_CMD_POWEROFF 0x03
#define VM_CMD_RESET 0x04
#define VM_CMD_ENABLE_IRQ 0x05 /* Enable/disable the messaging irq */
#define VM_CMD_DISABLE_IRQ 0x06
#define VM_CMD_SEND_NMI 0x07
#define VM_CMD_CAPABILITIES 0x08
#define VM_CAPABILITIES_POWER 0x01
#define VM_CAPABILITIES_RESET 0x02
#define VM_CAPABILITIES_IRQ 0x04
#define VM_CAPABILITIES_NMI 0x08
#define VM_CAPABILITIES_ATTN 0x10
#define VM_CAPABILITIES_GRACEFUL_SHUTDOWN 0x20
#define VM_CMD_GRACEFUL_SHUTDOWN 0x09
#define TYPE_IPMI_BMC_EXTERN "ipmi-bmc-extern"
#define IPMI_BMC_EXTERN(obj) OBJECT_CHECK(IPMIBmcExtern, (obj), \
TYPE_IPMI_BMC_EXTERN)
typedef struct IPMIBmcExtern {
IPMIBmc parent;
CharBackend chr;
bool connected;
unsigned char inbuf[MAX_IPMI_MSG_SIZE + 2];
unsigned int inpos;
bool in_escape;
bool in_too_many;
bool waiting_rsp;
bool sending_cmd;
unsigned char outbuf[(MAX_IPMI_MSG_SIZE + 2) * 2 + 1];
unsigned int outpos;
unsigned int outlen;
struct QEMUTimer *extern_timer;
/* A reset event is pending to be sent upstream. */
bool send_reset;
} IPMIBmcExtern;
static int can_receive(void *opaque);
static void receive(void *opaque, const uint8_t *buf, int size);
static void chr_event(void *opaque, int event);
static unsigned char
ipmb_checksum(const unsigned char *data, int size, unsigned char start)
{
unsigned char csum = start;
for (; size > 0; size--, data++) {
csum += *data;
}
return csum;
}
static void continue_send(IPMIBmcExtern *ibe)
{
int ret;
if (ibe->outlen == 0) {
goto check_reset;
}
send:
ret = qemu_chr_fe_write(&ibe->chr, ibe->outbuf + ibe->outpos,
ibe->outlen - ibe->outpos);
if (ret > 0) {
ibe->outpos += ret;
}
if (ibe->outpos < ibe->outlen) {
/* Not fully transmitted, try again in a 10ms */
timer_mod_ns(ibe->extern_timer,
qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + 10000000);
} else {
/* Sent */
ibe->outlen = 0;
ibe->outpos = 0;
if (!ibe->sending_cmd) {
ibe->waiting_rsp = true;
} else {
ibe->sending_cmd = false;
}
check_reset:
if (ibe->connected && ibe->send_reset) {
/* Send the reset */
ibe->outbuf[0] = VM_CMD_RESET;
ibe->outbuf[1] = VM_CMD_CHAR;
ibe->outlen = 2;
ibe->outpos = 0;
ibe->send_reset = false;
ibe->sending_cmd = true;
goto send;
}
if (ibe->waiting_rsp) {
/* Make sure we get a response within 4 seconds. */
timer_mod_ns(ibe->extern_timer,
qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + 4000000000ULL);
}
}
return;
}
static void extern_timeout(void *opaque)
{
IPMIBmcExtern *ibe = opaque;
IPMIInterface *s = ibe->parent.intf;
if (ibe->connected) {
if (ibe->waiting_rsp && (ibe->outlen == 0)) {
IPMIInterfaceClass *k = IPMI_INTERFACE_GET_CLASS(s);
/* The message response timed out, return an error. */
ibe->waiting_rsp = false;
ibe->inbuf[1] = ibe->outbuf[1] | 0x04;
ibe->inbuf[2] = ibe->outbuf[2];
ibe->inbuf[3] = IPMI_CC_TIMEOUT;
k->handle_rsp(s, ibe->outbuf[0], ibe->inbuf + 1, 3);
} else {
continue_send(ibe);
}
}
}
static void addchar(IPMIBmcExtern *ibe, unsigned char ch)
{
switch (ch) {
case VM_MSG_CHAR:
case VM_CMD_CHAR:
case VM_ESCAPE_CHAR:
ibe->outbuf[ibe->outlen] = VM_ESCAPE_CHAR;
ibe->outlen++;
ch |= 0x10;
/* No break */
default:
ibe->outbuf[ibe->outlen] = ch;
ibe->outlen++;
}
}
static void ipmi_bmc_extern_handle_command(IPMIBmc *b,
uint8_t *cmd, unsigned int cmd_len,
unsigned int max_cmd_len,
uint8_t msg_id)
{
IPMIBmcExtern *ibe = IPMI_BMC_EXTERN(b);
IPMIInterface *s = ibe->parent.intf;
uint8_t err = 0, csum;
unsigned int i;
if (ibe->outlen) {
/* We already have a command queued. Shouldn't ever happen. */
error_report("IPMI KCS: Got command when not finished with the"
" previous command");
abort();
}
/* If it's too short or it was truncated, return an error. */
if (cmd_len < 2) {
err = IPMI_CC_REQUEST_DATA_LENGTH_INVALID;
} else if ((cmd_len > max_cmd_len) || (cmd_len > MAX_IPMI_MSG_SIZE)) {
err = IPMI_CC_REQUEST_DATA_TRUNCATED;
} else if (!ibe->connected) {
err = IPMI_CC_BMC_INIT_IN_PROGRESS;
}
if (err) {
IPMIInterfaceClass *k = IPMI_INTERFACE_GET_CLASS(s);
unsigned char rsp[3];
rsp[0] = cmd[0] | 0x04;
rsp[1] = cmd[1];
rsp[2] = err;
ibe->waiting_rsp = false;
k->handle_rsp(s, msg_id, rsp, 3);
goto out;
}
addchar(ibe, msg_id);
for (i = 0; i < cmd_len; i++) {
addchar(ibe, cmd[i]);
}
csum = ipmb_checksum(&msg_id, 1, 0);
addchar(ibe, -ipmb_checksum(cmd, cmd_len, csum));
ibe->outbuf[ibe->outlen] = VM_MSG_CHAR;
ibe->outlen++;
/* Start the transmit */
continue_send(ibe);
out:
return;
}
static void handle_hw_op(IPMIBmcExtern *ibe, unsigned char hw_op)
{
IPMIInterface *s = ibe->parent.intf;
IPMIInterfaceClass *k = IPMI_INTERFACE_GET_CLASS(s);
switch (hw_op) {
case VM_CMD_VERSION:
/* We only support one version at this time. */
break;
case VM_CMD_NOATTN:
k->set_atn(s, 0, 0);
break;
case VM_CMD_ATTN:
k->set_atn(s, 1, 0);
break;
case VM_CMD_ATTN_IRQ:
k->set_atn(s, 1, 1);
break;
case VM_CMD_POWEROFF:
k->do_hw_op(s, IPMI_POWEROFF_CHASSIS, 0);
break;
case VM_CMD_RESET:
k->do_hw_op(s, IPMI_RESET_CHASSIS, 0);
break;
case VM_CMD_ENABLE_IRQ:
k->set_irq_enable(s, 1);
break;
case VM_CMD_DISABLE_IRQ:
k->set_irq_enable(s, 0);
break;
case VM_CMD_SEND_NMI:
k->do_hw_op(s, IPMI_SEND_NMI, 0);
break;
case VM_CMD_GRACEFUL_SHUTDOWN:
k->do_hw_op(s, IPMI_SHUTDOWN_VIA_ACPI_OVERTEMP, 0);
break;
}
}
static void handle_msg(IPMIBmcExtern *ibe)
{
IPMIInterfaceClass *k = IPMI_INTERFACE_GET_CLASS(ibe->parent.intf);
if (ibe->in_escape) {
ipmi_debug("msg escape not ended\n");
return;
}
if (ibe->inpos < 5) {
ipmi_debug("msg too short\n");
return;
}
if (ibe->in_too_many) {
ibe->inbuf[3] = IPMI_CC_REQUEST_DATA_TRUNCATED;
ibe->inpos = 4;
} else if (ipmb_checksum(ibe->inbuf, ibe->inpos, 0) != 0) {
ipmi_debug("msg checksum failure\n");
return;
} else {
ibe->inpos--; /* Remove checkum */
}
timer_del(ibe->extern_timer);
ibe->waiting_rsp = false;
k->handle_rsp(ibe->parent.intf, ibe->inbuf[0], ibe->inbuf + 1, ibe->inpos - 1);
}
static int can_receive(void *opaque)
{
return 1;
}
static void receive(void *opaque, const uint8_t *buf, int size)
{
IPMIBmcExtern *ibe = opaque;
int i;
unsigned char hw_op;
for (i = 0; i < size; i++) {
unsigned char ch = buf[i];
switch (ch) {
case VM_MSG_CHAR:
handle_msg(ibe);
ibe->in_too_many = false;
ibe->inpos = 0;
break;
case VM_CMD_CHAR:
if (ibe->in_too_many) {
ipmi_debug("cmd in too many\n");
ibe->in_too_many = false;
ibe->inpos = 0;
break;
}
if (ibe->in_escape) {
ipmi_debug("cmd in escape\n");
ibe->in_too_many = false;
ibe->inpos = 0;
ibe->in_escape = false;
break;
}
ibe->in_too_many = false;
if (ibe->inpos < 1) {
break;
}
hw_op = ibe->inbuf[0];
ibe->inpos = 0;
goto out_hw_op;
break;
case VM_ESCAPE_CHAR:
ibe->in_escape = true;
break;
default:
if (ibe->in_escape) {
ch &= ~0x10;
ibe->in_escape = false;
}
if (ibe->in_too_many) {
break;
}
if (ibe->inpos >= sizeof(ibe->inbuf)) {
ibe->in_too_many = true;
break;
}
ibe->inbuf[ibe->inpos] = ch;
ibe->inpos++;
break;
}
}
return;
out_hw_op:
handle_hw_op(ibe, hw_op);
}
static void chr_event(void *opaque, int event)
{
IPMIBmcExtern *ibe = opaque;
IPMIInterface *s = ibe->parent.intf;
IPMIInterfaceClass *k = IPMI_INTERFACE_GET_CLASS(s);
unsigned char v;
switch (event) {
case CHR_EVENT_OPENED:
ibe->connected = true;
ibe->outpos = 0;
ibe->outlen = 0;
addchar(ibe, VM_CMD_VERSION);
addchar(ibe, VM_PROTOCOL_VERSION);
ibe->outbuf[ibe->outlen] = VM_CMD_CHAR;
ibe->outlen++;
addchar(ibe, VM_CMD_CAPABILITIES);
v = VM_CAPABILITIES_IRQ | VM_CAPABILITIES_ATTN;
if (k->do_hw_op(ibe->parent.intf, IPMI_POWEROFF_CHASSIS, 1) == 0) {
v |= VM_CAPABILITIES_POWER;
}
if (k->do_hw_op(ibe->parent.intf, IPMI_SHUTDOWN_VIA_ACPI_OVERTEMP, 1)
== 0) {
v |= VM_CAPABILITIES_GRACEFUL_SHUTDOWN;
}
if (k->do_hw_op(ibe->parent.intf, IPMI_RESET_CHASSIS, 1) == 0) {
v |= VM_CAPABILITIES_RESET;
}
if (k->do_hw_op(ibe->parent.intf, IPMI_SEND_NMI, 1) == 0) {
v |= VM_CAPABILITIES_NMI;
}
addchar(ibe, v);
ibe->outbuf[ibe->outlen] = VM_CMD_CHAR;
ibe->outlen++;
ibe->sending_cmd = false;
continue_send(ibe);
break;
case CHR_EVENT_CLOSED:
if (!ibe->connected) {
return;
}
ibe->connected = false;
/*
* Don't hang the OS trying to handle the ATN bit, other end will
* resend on a reconnect.
*/
k->set_atn(s, 0, 0);
if (ibe->waiting_rsp) {
ibe->waiting_rsp = false;
ibe->inbuf[1] = ibe->outbuf[1] | 0x04;
ibe->inbuf[2] = ibe->outbuf[2];
ibe->inbuf[3] = IPMI_CC_BMC_INIT_IN_PROGRESS;
k->handle_rsp(s, ibe->outbuf[0], ibe->inbuf + 1, 3);
}
break;
}
}
static void ipmi_bmc_extern_handle_reset(IPMIBmc *b)
{
IPMIBmcExtern *ibe = IPMI_BMC_EXTERN(b);
ibe->send_reset = true;
continue_send(ibe);
}
static void ipmi_bmc_extern_realize(DeviceState *dev, Error **errp)
{
IPMIBmcExtern *ibe = IPMI_BMC_EXTERN(dev);
if (!qemu_chr_fe_backend_connected(&ibe->chr)) {
error_setg(errp, "IPMI external bmc requires chardev attribute");
return;
}
qemu_chr_fe_set_handlers(&ibe->chr, can_receive, receive,
chr_event, NULL, ibe, NULL, true);
}
static int ipmi_bmc_extern_post_migrate(void *opaque, int version_id)
{
IPMIBmcExtern *ibe = opaque;
/*
* We don't directly restore waiting_rsp, Instead, we return an
* error on the interface if a response was being waited for.
*/
if (ibe->waiting_rsp) {
IPMIInterface *ii = ibe->parent.intf;
IPMIInterfaceClass *iic = IPMI_INTERFACE_GET_CLASS(ii);
ibe->waiting_rsp = false;
ibe->inbuf[1] = ibe->outbuf[1] | 0x04;
ibe->inbuf[2] = ibe->outbuf[2];
ibe->inbuf[3] = IPMI_CC_BMC_INIT_IN_PROGRESS;
iic->handle_rsp(ii, ibe->outbuf[0], ibe->inbuf + 1, 3);
}
return 0;
}
static const VMStateDescription vmstate_ipmi_bmc_extern = {
.name = TYPE_IPMI_BMC_EXTERN,
.version_id = 1,
.minimum_version_id = 1,
.post_load = ipmi_bmc_extern_post_migrate,
.fields = (VMStateField[]) {
VMSTATE_BOOL(send_reset, IPMIBmcExtern),
VMSTATE_BOOL(waiting_rsp, IPMIBmcExtern),
VMSTATE_END_OF_LIST()
}
};
static void ipmi_bmc_extern_init(Object *obj)
{
IPMIBmcExtern *ibe = IPMI_BMC_EXTERN(obj);
ibe->extern_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, extern_timeout, ibe);
vmstate_register(NULL, 0, &vmstate_ipmi_bmc_extern, ibe);
}
static void ipmi_bmc_extern_finalize(Object *obj)
{
IPMIBmcExtern *ibe = IPMI_BMC_EXTERN(obj);
timer_del(ibe->extern_timer);
timer_free(ibe->extern_timer);
}
static Property ipmi_bmc_extern_properties[] = {
DEFINE_PROP_CHR("chardev", IPMIBmcExtern, chr),
DEFINE_PROP_END_OF_LIST(),
};
static void ipmi_bmc_extern_class_init(ObjectClass *oc, void *data)
{
DeviceClass *dc = DEVICE_CLASS(oc);
IPMIBmcClass *bk = IPMI_BMC_CLASS(oc);
bk->handle_command = ipmi_bmc_extern_handle_command;
bk->handle_reset = ipmi_bmc_extern_handle_reset;
dc->hotpluggable = false;
dc->realize = ipmi_bmc_extern_realize;
dc->props = ipmi_bmc_extern_properties;
}
static const TypeInfo ipmi_bmc_extern_type = {
.name = TYPE_IPMI_BMC_EXTERN,
.parent = TYPE_IPMI_BMC,
.instance_size = sizeof(IPMIBmcExtern),
.instance_init = ipmi_bmc_extern_init,
.instance_finalize = ipmi_bmc_extern_finalize,
.class_init = ipmi_bmc_extern_class_init,
};
static void ipmi_bmc_extern_register_types(void)
{
type_register_static(&ipmi_bmc_extern_type);
}
type_init(ipmi_bmc_extern_register_types)
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