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qemu/hw/ipmi/isa_ipmi_kcs.c
Corey Minyard 15139b8ef0 ipmi: rework the fwinfo to be fetched from the interface 
Instead of scanning IPMI devices from a fwinfo list, allow
the fwinfo to be fetched from the IPMI interface class.
Then the code looking for IPMI fwinfo can scan devices on a
bus and look for ones that implement the IPMI class.

This will let the ACPI scope be defined by the calling
code so the IPMI code doesn't have to know the scope.

Signed-off-by: Corey Minyard <cminyard@mvista.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2016-06-07 15:36:54 +03:00

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/*
* QEMU ISA IPMI KCS emulation
*
* 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.
*/
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "hw/hw.h"
#include "hw/ipmi/ipmi.h"
#include "hw/isa/isa.h"
#include "hw/i386/pc.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
typedef struct IPMIKCS {
IPMIBmc *bmc;
bool do_wake;
qemu_irq irq;
uint32_t io_base;
unsigned long io_length;
MemoryRegion io;
bool obf_irq_set;
bool atn_irq_set;
bool use_irq;
bool irqs_enabled;
uint8_t outmsg[MAX_IPMI_MSG_SIZE];
uint32_t outpos;
uint32_t outlen;
uint8_t inmsg[MAX_IPMI_MSG_SIZE];
uint32_t inlen;
bool write_end;
uint8_t status_reg;
uint8_t data_out_reg;
int16_t data_in_reg; /* -1 means not written */
int16_t cmd_reg;
/*
* This is a response number that we send with the command to make
* sure that the response matches the command.
*/
uint8_t waiting_rsp;
} IPMIKCS;
#define SET_OBF() \
do { \
IPMI_KCS_SET_OBF(ik->status_reg, 1); \
if (ik->use_irq && ik->irqs_enabled && !ik->obf_irq_set) { \
ik->obf_irq_set = 1; \
if (!ik->atn_irq_set) { \
qemu_irq_raise(ik->irq); \
} \
} \
} 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) {
qemu_irq_lower(ik->irq);
}
}
break;
case 1:
ret = ik->status_reg;
if (ik->atn_irq_set) {
ik->atn_irq_set = 0;
if (!ik->obf_irq_set) {
qemu_irq_lower(ik->irq);
}
}
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->use_irq && ik->irqs_enabled) {
ik->atn_irq_set = 1;
if (!ik->obf_irq_set) {
qemu_irq_raise(ik->irq);
}
}
} else {
if (ik->atn_irq_set) {
ik->atn_irq_set = 0;
if (!ik->obf_irq_set) {
qemu_irq_lower(ik->irq);
}
}
}
}
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);
}
#define TYPE_ISA_IPMI_KCS "isa-ipmi-kcs"
#define ISA_IPMI_KCS(obj) OBJECT_CHECK(ISAIPMIKCSDevice, (obj), \
TYPE_ISA_IPMI_KCS)
typedef struct ISAIPMIKCSDevice {
ISADevice dev;
int32_t isairq;
IPMIKCS kcs;
uint32_t uuid;
} ISAIPMIKCSDevice;
static void ipmi_kcs_get_fwinfo(IPMIInterface *ii, IPMIFwInfo *info)
{
ISAIPMIKCSDevice *iik = ISA_IPMI_KCS(ii);
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 = iik->kcs.io_base;
info->i2c_slave_address = iik->kcs.bmc->slave_addr;
info->register_length = iik->kcs.io_length;
info->register_spacing = 1;
info->memspace = IPMI_MEMSPACE_IO;
info->irq_type = IPMI_LEVEL_IRQ;
info->interrupt_number = iik->isairq;
info->uuid = iik->uuid;
}
static 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;
iic->get_fwinfo = ipmi_kcs_get_fwinfo;
}
static void ipmi_isa_realize(DeviceState *dev, Error **errp)
{
ISADevice *isadev = ISA_DEVICE(dev);
ISAIPMIKCSDevice *iik = ISA_IPMI_KCS(dev);
IPMIInterface *ii = IPMI_INTERFACE(dev);
IPMIInterfaceClass *iic = IPMI_INTERFACE_GET_CLASS(ii);
if (!iik->kcs.bmc) {
error_setg(errp, "IPMI device requires a bmc attribute to be set");
return;
}
iik->uuid = ipmi_next_uuid();
iik->kcs.bmc->intf = ii;
iic->init(ii, errp);
if (*errp)
return;
if (iik->isairq > 0) {
isa_init_irq(isadev, &iik->kcs.irq, iik->isairq);
iik->kcs.use_irq = 1;
}
qdev_set_legacy_instance_id(dev, iik->kcs.io_base, iik->kcs.io_length);
isa_register_ioport(isadev, &iik->kcs.io, iik->kcs.io_base);
}
const VMStateDescription vmstate_ISAIPMIKCSDevice = {
.name = TYPE_IPMI_INTERFACE,
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_BOOL(kcs.obf_irq_set, ISAIPMIKCSDevice),
VMSTATE_BOOL(kcs.atn_irq_set, ISAIPMIKCSDevice),
VMSTATE_BOOL(kcs.use_irq, ISAIPMIKCSDevice),
VMSTATE_BOOL(kcs.irqs_enabled, ISAIPMIKCSDevice),
VMSTATE_UINT32(kcs.outpos, ISAIPMIKCSDevice),
VMSTATE_VBUFFER_UINT32(kcs.outmsg, ISAIPMIKCSDevice, 1, NULL, 0,
kcs.outlen),
VMSTATE_VBUFFER_UINT32(kcs.inmsg, ISAIPMIKCSDevice, 1, NULL, 0,
kcs.inlen),
VMSTATE_BOOL(kcs.write_end, ISAIPMIKCSDevice),
VMSTATE_UINT8(kcs.status_reg, ISAIPMIKCSDevice),
VMSTATE_UINT8(kcs.data_out_reg, ISAIPMIKCSDevice),
VMSTATE_INT16(kcs.data_in_reg, ISAIPMIKCSDevice),
VMSTATE_INT16(kcs.cmd_reg, ISAIPMIKCSDevice),
VMSTATE_UINT8(kcs.waiting_rsp, ISAIPMIKCSDevice),
VMSTATE_END_OF_LIST()
}
};
static void isa_ipmi_kcs_init(Object *obj)
{
ISAIPMIKCSDevice *iik = ISA_IPMI_KCS(obj);
ipmi_bmc_find_and_link(obj, (Object **) &iik->kcs.bmc);
vmstate_register(NULL, 0, &vmstate_ISAIPMIKCSDevice, iik);
}
static void *isa_ipmi_kcs_get_backend_data(IPMIInterface *ii)
{
ISAIPMIKCSDevice *iik = ISA_IPMI_KCS(ii);
return &iik->kcs;
}
static Property ipmi_isa_properties[] = {
DEFINE_PROP_UINT32("ioport", ISAIPMIKCSDevice, kcs.io_base, 0xca2),
DEFINE_PROP_INT32("irq", ISAIPMIKCSDevice, isairq, 5),
DEFINE_PROP_END_OF_LIST(),
};
static void isa_ipmi_kcs_class_init(ObjectClass *oc, void *data)
{
DeviceClass *dc = DEVICE_CLASS(oc);
IPMIInterfaceClass *iic = IPMI_INTERFACE_CLASS(oc);
dc->realize = ipmi_isa_realize;
dc->props = ipmi_isa_properties;
iic->get_backend_data = isa_ipmi_kcs_get_backend_data;
ipmi_kcs_class_init(iic);
}
static const TypeInfo isa_ipmi_kcs_info = {
.name = TYPE_ISA_IPMI_KCS,
.parent = TYPE_ISA_DEVICE,
.instance_size = sizeof(ISAIPMIKCSDevice),
.instance_init = isa_ipmi_kcs_init,
.class_init = isa_ipmi_kcs_class_init,
.interfaces = (InterfaceInfo[]) {
{ TYPE_IPMI_INTERFACE },
{ }
}
};
static void ipmi_register_types(void)
{
type_register_static(&isa_ipmi_kcs_info);
}
type_init(ipmi_register_types)
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