/*
* QEMU IPMI KCS emulation
*
* Copyright (c) 2015,2017 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.
*/
#include "qemu/osdep.h"
#include "migration/vmstate.h"
#include "qemu/log.h"
#include "qapi/error.h"
#include "hw/ipmi/ipmi_kcs.h"
#define IPMI_KCS_OBF_BIT 0
#define IPMI_KCS_IBF_BIT 1
#define IPMI_KCS_SMS_ATN_BIT 2
#define IPMI_KCS_CD_BIT 3
#define IPMI_KCS_OBF_MASK (1 << IPMI_KCS_OBF_BIT)
#define IPMI_KCS_GET_OBF(d) (((d) >> IPMI_KCS_OBF_BIT) & 0x1)
#define IPMI_KCS_SET_OBF(d, v) (d) = (((d) & ~IPMI_KCS_OBF_MASK) | \
(((v) & 1) << IPMI_KCS_OBF_BIT))
#define IPMI_KCS_IBF_MASK (1 << IPMI_KCS_IBF_BIT)
#define IPMI_KCS_GET_IBF(d) (((d) >> IPMI_KCS_IBF_BIT) & 0x1)
#define IPMI_KCS_SET_IBF(d, v) (d) = (((d) & ~IPMI_KCS_IBF_MASK) | \
(((v) & 1) << IPMI_KCS_IBF_BIT))
#define IPMI_KCS_SMS_ATN_MASK (1 << IPMI_KCS_SMS_ATN_BIT)
#define IPMI_KCS_GET_SMS_ATN(d) (((d) >> IPMI_KCS_SMS_ATN_BIT) & 0x1)
#define IPMI_KCS_SET_SMS_ATN(d, v) (d) = (((d) & ~IPMI_KCS_SMS_ATN_MASK) | \
(((v) & 1) << IPMI_KCS_SMS_ATN_BIT))
#define IPMI_KCS_CD_MASK (1 << IPMI_KCS_CD_BIT)
#define IPMI_KCS_GET_CD(d) (((d) >> IPMI_KCS_CD_BIT) & 0x1)
#define IPMI_KCS_SET_CD(d, v) (d) = (((d) & ~IPMI_KCS_CD_MASK) | \
(((v) & 1) << IPMI_KCS_CD_BIT))
#define IPMI_KCS_IDLE_STATE 0
#define IPMI_KCS_READ_STATE 1
#define IPMI_KCS_WRITE_STATE 2
#define IPMI_KCS_ERROR_STATE 3
#define IPMI_KCS_GET_STATE(d) (((d) >> 6) & 0x3)
#define IPMI_KCS_SET_STATE(d, v) ((d) = ((d) & ~0xc0) | (((v) & 0x3) << 6))
#define IPMI_KCS_ABORT_STATUS_CMD 0x60
#define IPMI_KCS_WRITE_START_CMD 0x61
#define IPMI_KCS_WRITE_END_CMD 0x62
#define IPMI_KCS_READ_CMD 0x68
#define IPMI_KCS_STATUS_NO_ERR 0x00
#define IPMI_KCS_STATUS_ABORTED_ERR 0x01
#define IPMI_KCS_STATUS_BAD_CC_ERR 0x02
#define IPMI_KCS_STATUS_LENGTH_ERR 0x06
static void ipmi_kcs_raise_irq(IPMIKCS *ik)
{
if (ik->use_irq && ik->irqs_enabled && ik->raise_irq) {
ik->raise_irq(ik);
}
}
static void ipmi_kcs_lower_irq(IPMIKCS *ik)
{
if (ik->lower_irq) {
ik->lower_irq(ik);
}
}
#define SET_OBF() \
do { \
IPMI_KCS_SET_OBF(ik->status_reg, 1); \
if (!ik->obf_irq_set) { \
ik->obf_irq_set = 1; \
if (!ik->atn_irq_set) { \
ipmi_kcs_raise_irq(ik); \
} \
} \
} while (0)
static void ipmi_kcs_signal(IPMIKCS *ik, IPMIInterface *ii)
{
IPMIInterfaceClass *iic = IPMI_INTERFACE_GET_CLASS(ii);
ik->do_wake = 1;
while (ik->do_wake) {
ik->do_wake = 0;
iic->handle_if_event(ii);
}
}
static void ipmi_kcs_handle_event(IPMIInterface *ii)
{
IPMIInterfaceClass *iic = IPMI_INTERFACE_GET_CLASS(ii);
IPMIKCS *ik = iic->get_backend_data(ii);
if (ik->cmd_reg == IPMI_KCS_ABORT_STATUS_CMD) {
if (IPMI_KCS_GET_STATE(ik->status_reg) != IPMI_KCS_ERROR_STATE) {
ik->waiting_rsp++; /* Invalidate the message */
ik->outmsg[0] = IPMI_KCS_STATUS_ABORTED_ERR;
ik->outlen = 1;
ik->outpos = 0;
IPMI_KCS_SET_STATE(ik->status_reg, IPMI_KCS_ERROR_STATE);
SET_OBF();
}
goto out;
}
switch (IPMI_KCS_GET_STATE(ik->status_reg)) {
case IPMI_KCS_IDLE_STATE:
if (ik->cmd_reg == IPMI_KCS_WRITE_START_CMD) {
IPMI_KCS_SET_STATE(ik->status_reg, IPMI_KCS_WRITE_STATE);
ik->cmd_reg = -1;
ik->write_end = 0;
ik->inlen = 0;
SET_OBF();
}
break;
case IPMI_KCS_READ_STATE:
handle_read:
if (ik->outpos >= ik->outlen) {
IPMI_KCS_SET_STATE(ik->status_reg, IPMI_KCS_IDLE_STATE);
SET_OBF();
} else if (ik->data_in_reg == IPMI_KCS_READ_CMD) {
ik->data_out_reg = ik->outmsg[ik->outpos];
ik->outpos++;
SET_OBF();
} else {
ik->outmsg[0] = IPMI_KCS_STATUS_BAD_CC_ERR;
ik->outlen = 1;
ik->outpos = 0;
IPMI_KCS_SET_STATE(ik->status_reg, IPMI_KCS_ERROR_STATE);
SET_OBF();
goto out;
}
break;
case IPMI_KCS_WRITE_STATE:
if (ik->data_in_reg != -1) {
/*
* Don't worry about input overrun here, that will be
* handled in the BMC.
*/
if (ik->inlen < sizeof(ik->inmsg)) {
ik->inmsg[ik->inlen] = ik->data_in_reg;
}
ik->inlen++;
}
if (ik->write_end) {
IPMIBmcClass *bk = IPMI_BMC_GET_CLASS(ik->bmc);
ik->outlen = 0;
ik->write_end = 0;
ik->outpos = 0;
bk->handle_command(ik->bmc, ik->inmsg, ik->inlen, sizeof(ik->inmsg),
ik->waiting_rsp);
goto out_noibf;
} else if (ik->cmd_reg == IPMI_KCS_WRITE_END_CMD) {
ik->cmd_reg = -1;
ik->write_end = 1;
}
SET_OBF();
break;
case IPMI_KCS_ERROR_STATE:
if (ik->data_in_reg != -1) {
IPMI_KCS_SET_STATE(ik->status_reg, IPMI_KCS_READ_STATE);
ik->data_in_reg = IPMI_KCS_READ_CMD;
goto handle_read;
}
break;
}
if (ik->cmd_reg != -1) {
/* Got an invalid command */
ik->outmsg[0] = IPMI_KCS_STATUS_BAD_CC_ERR;
ik->outlen = 1;
ik->outpos = 0;
IPMI_KCS_SET_STATE(ik->status_reg, IPMI_KCS_ERROR_STATE);
}
out:
ik->cmd_reg = -1;
ik->data_in_reg = -1;
IPMI_KCS_SET_IBF(ik->status_reg, 0);
out_noibf:
return;
}
static void ipmi_kcs_handle_rsp(IPMIInterface *ii, uint8_t msg_id,
unsigned char *rsp, unsigned int rsp_len)
{
IPMIInterfaceClass *iic = IPMI_INTERFACE_GET_CLASS(ii);
IPMIKCS *ik = iic->get_backend_data(ii);
if (ik->waiting_rsp == msg_id) {
ik->waiting_rsp++;
if (rsp_len > sizeof(ik->outmsg)) {
ik->outmsg[0] = rsp[0];
ik->outmsg[1] = rsp[1];
ik->outmsg[2] = IPMI_CC_CANNOT_RETURN_REQ_NUM_BYTES;
ik->outlen = 3;
} else {
memcpy(ik->outmsg, rsp, rsp_len);
ik->outlen = rsp_len;
}
IPMI_KCS_SET_STATE(ik->status_reg, IPMI_KCS_READ_STATE);
ik->data_in_reg = IPMI_KCS_READ_CMD;
ipmi_kcs_signal(ik, ii);
}
}
static uint64_t ipmi_kcs_ioport_read(void *opaque, hwaddr addr, unsigned size)
{
IPMIInterface *ii = opaque;
IPMIInterfaceClass *iic = IPMI_INTERFACE_GET_CLASS(ii);
IPMIKCS *ik = iic->get_backend_data(ii);
uint32_t ret;
switch (addr & 1) {
case 0:
ret = ik->data_out_reg;
IPMI_KCS_SET_OBF(ik->status_reg, 0);
if (ik->obf_irq_set) {
ik->obf_irq_set = 0;
if (!ik->atn_irq_set) {
ipmi_kcs_lower_irq(ik);
}
}
break;
case 1:
ret = ik->status_reg;
if (ik->atn_irq_set) {
ik->atn_irq_set = 0;
if (!ik->obf_irq_set) {
ipmi_kcs_lower_irq(ik);
}
}
break;
}
return ret;
}
static void ipmi_kcs_ioport_write(void *opaque, hwaddr addr, uint64_t val,
unsigned size)
{
IPMIInterface *ii = opaque;
IPMIInterfaceClass *iic = IPMI_INTERFACE_GET_CLASS(ii);
IPMIKCS *ik = iic->get_backend_data(ii);
if (IPMI_KCS_GET_IBF(ik->status_reg)) {
return;
}
switch (addr & 1) {
case 0:
ik->data_in_reg = val;
break;
case 1:
ik->cmd_reg = val;
break;
}
IPMI_KCS_SET_IBF(ik->status_reg, 1);
ipmi_kcs_signal(ik, ii);
}
const MemoryRegionOps ipmi_kcs_io_ops = {
.read = ipmi_kcs_ioport_read,
.write = ipmi_kcs_ioport_write,
.impl = {
.min_access_size = 1,
.max_access_size = 1,
},
.endianness = DEVICE_LITTLE_ENDIAN,
};
static void ipmi_kcs_set_atn(IPMIInterface *ii, int val, int irq)
{
IPMIInterfaceClass *iic = IPMI_INTERFACE_GET_CLASS(ii);
IPMIKCS *ik = iic->get_backend_data(ii);
IPMI_KCS_SET_SMS_ATN(ik->status_reg, val);
if (val) {
if (irq && !ik->atn_irq_set) {
ik->atn_irq_set = 1;
if (!ik->obf_irq_set) {
ipmi_kcs_raise_irq(ik);
}
}
} else {
if (ik->atn_irq_set) {
ik->atn_irq_set = 0;
if (!ik->obf_irq_set) {
ipmi_kcs_lower_irq(ik);
}
}
}
}
static void ipmi_kcs_set_irq_enable(IPMIInterface *ii, int val)
{
IPMIInterfaceClass *iic = IPMI_INTERFACE_GET_CLASS(ii);
IPMIKCS *ik = iic->get_backend_data(ii);
ik->irqs_enabled = val;
}
static void ipmi_kcs_init(IPMIInterface *ii, Error **errp)
{
IPMIInterfaceClass *iic = IPMI_INTERFACE_GET_CLASS(ii);
IPMIKCS *ik = iic->get_backend_data(ii);
ik->io_length = 2;
memory_region_init_io(&ik->io, NULL, &ipmi_kcs_io_ops, ii, "ipmi-kcs", 2);
}
int ipmi_kcs_vmstate_post_load(void *opaque, int version)
{
IPMIKCS *ik = opaque;
/* Make sure all the values are sane. */
if (ik->outpos >= MAX_IPMI_MSG_SIZE || ik->outlen >= MAX_IPMI_MSG_SIZE ||
ik->outpos >= ik->outlen) {
qemu_log_mask(LOG_GUEST_ERROR,
"ipmi:kcs: vmstate transfer received bad out values: %d %d\n",
ik->outpos, ik->outlen);
ik->outpos = 0;
ik->outlen = 0;
}
if (ik->inlen >= MAX_IPMI_MSG_SIZE) {
qemu_log_mask(LOG_GUEST_ERROR,
"ipmi:kcs: vmstate transfer received bad in value: %d\n",
ik->inlen);
ik->inlen = 0;
}
return 0;
}
static bool vmstate_kcs_before_version2(void *opaque, int version)
{
return version <= 1;
}
const VMStateDescription vmstate_IPMIKCS = {
.name = TYPE_IPMI_INTERFACE_PREFIX "kcs",
.version_id = 2,
.minimum_version_id = 1,
.post_load = ipmi_kcs_vmstate_post_load,
.fields = (VMStateField[]) {
VMSTATE_BOOL(obf_irq_set, IPMIKCS),
VMSTATE_BOOL(atn_irq_set, IPMIKCS),
VMSTATE_UNUSED_TEST(vmstate_kcs_before_version2, 1), /* Was use_irq */
VMSTATE_BOOL(irqs_enabled, IPMIKCS),
VMSTATE_UINT32(outpos, IPMIKCS),
VMSTATE_UINT32_V(outlen, IPMIKCS, 2),
VMSTATE_UINT8_ARRAY(outmsg, IPMIKCS, MAX_IPMI_MSG_SIZE),
VMSTATE_UINT32_V(inlen, IPMIKCS, 2),
VMSTATE_UINT8_ARRAY(inmsg, IPMIKCS, MAX_IPMI_MSG_SIZE),
VMSTATE_BOOL(write_end, IPMIKCS),
VMSTATE_UINT8(status_reg, IPMIKCS),
VMSTATE_UINT8(data_out_reg, IPMIKCS),
VMSTATE_INT16(data_in_reg, IPMIKCS),
VMSTATE_INT16(cmd_reg, IPMIKCS),
VMSTATE_UINT8(waiting_rsp, IPMIKCS),
VMSTATE_END_OF_LIST()
}
};
void ipmi_kcs_get_fwinfo(IPMIKCS *ik, IPMIFwInfo *info)
{
info->interface_name = "kcs";
info->interface_type = IPMI_SMBIOS_KCS;
info->ipmi_spec_major_revision = 2;
info->ipmi_spec_minor_revision = 0;
info->base_address = ik->io_base;
info->i2c_slave_address = ik->bmc->slave_addr;
info->register_length = ik->io_length;
info->register_spacing = 1;
info->memspace = IPMI_MEMSPACE_IO;
info->irq_type = IPMI_LEVEL_IRQ;
}
void ipmi_kcs_class_init(IPMIInterfaceClass *iic)
{
iic->init = ipmi_kcs_init;
iic->set_atn = ipmi_kcs_set_atn;
iic->handle_rsp = ipmi_kcs_handle_rsp;
iic->handle_if_event = ipmi_kcs_handle_event;
iic->set_irq_enable = ipmi_kcs_set_irq_enable;
}
