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qemu/hw/ppc/pnv_sbe.c
Nicholas Piggin 0bf4d77e59 ppc/pnv: Add initial P9/10 SBE model 
The SBE (Self Boot Engine) are on-chip microcontrollers that perform
early boot steps, as well as provide some runtime facilities (e.g.,
timer, secure register access, MPIPL). The latter facilities are
accessed mostly via a message system called SBEFIFO.

This driver provides initial emulation for the SBE runtime registers
and a very basic SBEFIFO implementation that provides the timer
command. This covers the basic SBE behaviour expected by skiboot when
booting.

Reviewed-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Message-Id: <20220811093726.1442343-1-npiggin@gmail.com>
[danielhb: fixed SBE_HOST_RESPONSE_MASK long line]
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
2022-08-31 14:08:05 -03:00

415 lines
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/*
* QEMU PowerPC PowerNV Emulation of some SBE behaviour
*
* Copyright (c) 2022, IBM Corporation.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2, as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "target/ppc/cpu.h"
#include "qapi/error.h"
#include "qemu/log.h"
#include "qemu/module.h"
#include "hw/irq.h"
#include "hw/qdev-properties.h"
#include "hw/ppc/pnv.h"
#include "hw/ppc/pnv_xscom.h"
#include "hw/ppc/pnv_sbe.h"
#include "trace.h"
/*
* Most register and command definitions come from skiboot.
*
* xscom addresses are adjusted to be relative to xscom subregion bases
*/
/*
* SBE MBOX register address
* Reg 0 - 3 : Host to send command packets to SBE
* Reg 4 - 7 : SBE to send response packets to Host
*/
#define PSU_HOST_SBE_MBOX_REG0 0x00000000
#define PSU_HOST_SBE_MBOX_REG1 0x00000001
#define PSU_HOST_SBE_MBOX_REG2 0x00000002
#define PSU_HOST_SBE_MBOX_REG3 0x00000003
#define PSU_HOST_SBE_MBOX_REG4 0x00000004
#define PSU_HOST_SBE_MBOX_REG5 0x00000005
#define PSU_HOST_SBE_MBOX_REG6 0x00000006
#define PSU_HOST_SBE_MBOX_REG7 0x00000007
#define PSU_SBE_DOORBELL_REG_RW 0x00000010
#define PSU_SBE_DOORBELL_REG_AND 0x00000011
#define PSU_SBE_DOORBELL_REG_OR 0x00000012
#define PSU_HOST_DOORBELL_REG_RW 0x00000013
#define PSU_HOST_DOORBELL_REG_AND 0x00000014
#define PSU_HOST_DOORBELL_REG_OR 0x00000015
/*
* Doorbell register to trigger SBE interrupt. Set by OPAL to inform
* the SBE about a waiting message in the Host/SBE mailbox registers
*/
#define HOST_SBE_MSG_WAITING PPC_BIT(0)
/*
* Doorbell register for host bridge interrupt. Set by the SBE to inform
* host about a response message in the Host/SBE mailbox registers
*/
#define SBE_HOST_RESPONSE_WAITING PPC_BIT(0)
#define SBE_HOST_MSG_READ PPC_BIT(1)
#define SBE_HOST_STOP15_EXIT PPC_BIT(2)
#define SBE_HOST_RESET PPC_BIT(3)
#define SBE_HOST_PASSTHROUGH PPC_BIT(4)
#define SBE_HOST_TIMER_EXPIRY PPC_BIT(14)
#define SBE_HOST_RESPONSE_MASK (PPC_BITMASK(0, 4) | \
SBE_HOST_TIMER_EXPIRY)
/* SBE Control Register */
#define SBE_CONTROL_REG_RW 0x00000000
/* SBE interrupt s0/s1 bits */
#define SBE_CONTROL_REG_S0 PPC_BIT(14)
#define SBE_CONTROL_REG_S1 PPC_BIT(15)
struct sbe_msg {
uint64_t reg[4];
};
static uint64_t pnv_sbe_power9_xscom_ctrl_read(void *opaque, hwaddr addr,
unsigned size)
{
uint32_t offset = addr >> 3;
uint64_t val = 0;
switch (offset) {
default:
qemu_log_mask(LOG_UNIMP, "SBE Unimplemented register: Ox%"
HWADDR_PRIx "\n", addr >> 3);
}
trace_pnv_sbe_xscom_ctrl_read(addr, val);
return val;
}
static void pnv_sbe_power9_xscom_ctrl_write(void *opaque, hwaddr addr,
uint64_t val, unsigned size)
{
uint32_t offset = addr >> 3;
trace_pnv_sbe_xscom_ctrl_write(addr, val);
switch (offset) {
default:
qemu_log_mask(LOG_UNIMP, "SBE Unimplemented register: Ox%"
HWADDR_PRIx "\n", addr >> 3);
}
}
static const MemoryRegionOps pnv_sbe_power9_xscom_ctrl_ops = {
.read = pnv_sbe_power9_xscom_ctrl_read,
.write = pnv_sbe_power9_xscom_ctrl_write,
.valid.min_access_size = 8,
.valid.max_access_size = 8,
.impl.min_access_size = 8,
.impl.max_access_size = 8,
.endianness = DEVICE_BIG_ENDIAN,
};
static void pnv_sbe_set_host_doorbell(PnvSBE *sbe, uint64_t val)
{
val &= SBE_HOST_RESPONSE_MASK; /* Is this right? What does HW do? */
sbe->host_doorbell = val;
trace_pnv_sbe_reg_set_host_doorbell(val);
qemu_set_irq(sbe->psi_irq, !!val);
}
/* SBE Target Type */
#define SBE_TARGET_TYPE_PROC 0x00
#define SBE_TARGET_TYPE_EX 0x01
#define SBE_TARGET_TYPE_PERV 0x02
#define SBE_TARGET_TYPE_MCS 0x03
#define SBE_TARGET_TYPE_EQ 0x04
#define SBE_TARGET_TYPE_CORE 0x05
/* SBE MBOX command class */
#define SBE_MCLASS_FIRST 0xD1
#define SBE_MCLASS_CORE_STATE 0xD1
#define SBE_MCLASS_SCOM 0xD2
#define SBE_MCLASS_RING 0xD3
#define SBE_MCLASS_TIMER 0xD4
#define SBE_MCLASS_MPIPL 0xD5
#define SBE_MCLASS_SECURITY 0xD6
#define SBE_MCLASS_GENERIC 0xD7
#define SBE_MCLASS_LAST 0xD7
/*
* Commands are provided in xxyy form where:
* - xx : command class
* - yy : command
*
* Both request and response message uses same seq ID,
* command class and command.
*/
#define SBE_CMD_CTRL_DEADMAN_LOOP 0xD101
#define SBE_CMD_MULTI_SCOM 0xD201
#define SBE_CMD_PUT_RING_FORM_IMAGE 0xD301
#define SBE_CMD_CONTROL_TIMER 0xD401
#define SBE_CMD_GET_ARCHITECTED_REG 0xD501
#define SBE_CMD_CLR_ARCHITECTED_REG 0xD502
#define SBE_CMD_SET_UNSEC_MEM_WINDOW 0xD601
#define SBE_CMD_GET_SBE_FFDC 0xD701
#define SBE_CMD_GET_CAPABILITY 0xD702
#define SBE_CMD_READ_SBE_SEEPROM 0xD703
#define SBE_CMD_SET_FFDC_ADDR 0xD704
#define SBE_CMD_QUIESCE_SBE 0xD705
#define SBE_CMD_SET_FABRIC_ID_MAP 0xD706
#define SBE_CMD_STASH_MPIPL_CONFIG 0xD707
/* SBE MBOX control flags */
/* Generic flags */
#define SBE_CMD_CTRL_RESP_REQ 0x0100
#define SBE_CMD_CTRL_ACK_REQ 0x0200
/* Deadman loop */
#define CTRL_DEADMAN_LOOP_START 0x0001
#define CTRL_DEADMAN_LOOP_STOP 0x0002
/* Control timer */
#define CONTROL_TIMER_START 0x0001
#define CONTROL_TIMER_STOP 0x0002
/* Stash MPIPL config */
#define SBE_STASH_KEY_SKIBOOT_BASE 0x03
static void sbe_timer(void *opaque)
{
PnvSBE *sbe = opaque;
trace_pnv_sbe_cmd_timer_expired();
pnv_sbe_set_host_doorbell(sbe, sbe->host_doorbell | SBE_HOST_TIMER_EXPIRY);
}
static void do_sbe_msg(PnvSBE *sbe)
{
struct sbe_msg msg;
uint16_t cmd, ctrl_flags, seq_id;
int i;
memset(&msg, 0, sizeof(msg));
for (i = 0; i < 4; i++) {
msg.reg[i] = sbe->mbox[i];
}
cmd = msg.reg[0];
seq_id = msg.reg[0] >> 16;
ctrl_flags = msg.reg[0] >> 32;
trace_pnv_sbe_msg_recv(cmd, seq_id, ctrl_flags);
if (ctrl_flags & SBE_CMD_CTRL_ACK_REQ) {
pnv_sbe_set_host_doorbell(sbe, sbe->host_doorbell | SBE_HOST_MSG_READ);
}
switch (cmd) {
case SBE_CMD_CONTROL_TIMER:
if (ctrl_flags & CONTROL_TIMER_START) {
uint64_t us = msg.reg[1];
trace_pnv_sbe_cmd_timer_start(us);
timer_mod(sbe->timer, qemu_clock_get_us(QEMU_CLOCK_VIRTUAL) + us);
}
if (ctrl_flags & CONTROL_TIMER_STOP) {
trace_pnv_sbe_cmd_timer_stop();
timer_del(sbe->timer);
}
break;
default:
qemu_log_mask(LOG_UNIMP, "SBE Unimplemented command: 0x%x\n", cmd);
}
}
static void pnv_sbe_set_sbe_doorbell(PnvSBE *sbe, uint64_t val)
{
val &= HOST_SBE_MSG_WAITING;
sbe->sbe_doorbell = val;
if (val & HOST_SBE_MSG_WAITING) {
sbe->sbe_doorbell &= ~HOST_SBE_MSG_WAITING;
do_sbe_msg(sbe);
}
}
static uint64_t pnv_sbe_power9_xscom_mbox_read(void *opaque, hwaddr addr,
unsigned size)
{
PnvSBE *sbe = PNV_SBE(opaque);
uint32_t offset = addr >> 3;
uint64_t val = 0;
if (offset <= PSU_HOST_SBE_MBOX_REG7) {
uint32_t idx = offset - PSU_HOST_SBE_MBOX_REG0;
val = sbe->mbox[idx];
} else {
switch (offset) {
case PSU_SBE_DOORBELL_REG_RW:
val = sbe->sbe_doorbell;
break;
case PSU_HOST_DOORBELL_REG_RW:
val = sbe->host_doorbell;
break;
default:
qemu_log_mask(LOG_UNIMP, "SBE Unimplemented register: Ox%"
HWADDR_PRIx "\n", addr >> 3);
}
}
trace_pnv_sbe_xscom_mbox_read(addr, val);
return val;
}
static void pnv_sbe_power9_xscom_mbox_write(void *opaque, hwaddr addr,
uint64_t val, unsigned size)
{
PnvSBE *sbe = PNV_SBE(opaque);
uint32_t offset = addr >> 3;
trace_pnv_sbe_xscom_mbox_write(addr, val);
if (offset <= PSU_HOST_SBE_MBOX_REG7) {
uint32_t idx = offset - PSU_HOST_SBE_MBOX_REG0;
sbe->mbox[idx] = val;
} else {
switch (offset) {
case PSU_SBE_DOORBELL_REG_RW:
pnv_sbe_set_sbe_doorbell(sbe, val);
break;
case PSU_SBE_DOORBELL_REG_AND:
pnv_sbe_set_sbe_doorbell(sbe, sbe->sbe_doorbell & val);
break;
case PSU_SBE_DOORBELL_REG_OR:
pnv_sbe_set_sbe_doorbell(sbe, sbe->sbe_doorbell | val);
break;
case PSU_HOST_DOORBELL_REG_RW:
pnv_sbe_set_host_doorbell(sbe, val);
break;
case PSU_HOST_DOORBELL_REG_AND:
pnv_sbe_set_host_doorbell(sbe, sbe->host_doorbell & val);
break;
case PSU_HOST_DOORBELL_REG_OR:
pnv_sbe_set_host_doorbell(sbe, sbe->host_doorbell | val);
break;
default:
qemu_log_mask(LOG_UNIMP, "SBE Unimplemented register: Ox%"
HWADDR_PRIx "\n", addr >> 3);
}
}
}
static const MemoryRegionOps pnv_sbe_power9_xscom_mbox_ops = {
.read = pnv_sbe_power9_xscom_mbox_read,
.write = pnv_sbe_power9_xscom_mbox_write,
.valid.min_access_size = 8,
.valid.max_access_size = 8,
.impl.min_access_size = 8,
.impl.max_access_size = 8,
.endianness = DEVICE_BIG_ENDIAN,
};
static void pnv_sbe_power9_class_init(ObjectClass *klass, void *data)
{
PnvSBEClass *psc = PNV_SBE_CLASS(klass);
DeviceClass *dc = DEVICE_CLASS(klass);
dc->desc = "PowerNV SBE Controller (POWER9)";
psc->xscom_ctrl_size = PNV9_XSCOM_SBE_CTRL_SIZE;
psc->xscom_ctrl_ops = &pnv_sbe_power9_xscom_ctrl_ops;
psc->xscom_mbox_size = PNV9_XSCOM_SBE_MBOX_SIZE;
psc->xscom_mbox_ops = &pnv_sbe_power9_xscom_mbox_ops;
}
static const TypeInfo pnv_sbe_power9_type_info = {
.name = TYPE_PNV9_SBE,
.parent = TYPE_PNV_SBE,
.instance_size = sizeof(PnvSBE),
.class_init = pnv_sbe_power9_class_init,
};
static void pnv_sbe_power10_class_init(ObjectClass *klass, void *data)
{
PnvSBEClass *psc = PNV_SBE_CLASS(klass);
DeviceClass *dc = DEVICE_CLASS(klass);
dc->desc = "PowerNV SBE Controller (POWER10)";
psc->xscom_ctrl_size = PNV10_XSCOM_SBE_CTRL_SIZE;
psc->xscom_ctrl_ops = &pnv_sbe_power9_xscom_ctrl_ops;
psc->xscom_mbox_size = PNV10_XSCOM_SBE_MBOX_SIZE;
psc->xscom_mbox_ops = &pnv_sbe_power9_xscom_mbox_ops;
}
static const TypeInfo pnv_sbe_power10_type_info = {
.name = TYPE_PNV10_SBE,
.parent = TYPE_PNV9_SBE,
.class_init = pnv_sbe_power10_class_init,
};
static void pnv_sbe_realize(DeviceState *dev, Error **errp)
{
PnvSBE *sbe = PNV_SBE(dev);
PnvSBEClass *psc = PNV_SBE_GET_CLASS(sbe);
/* XScom regions for SBE registers */
pnv_xscom_region_init(&sbe->xscom_ctrl_regs, OBJECT(dev),
psc->xscom_ctrl_ops, sbe, "xscom-sbe-ctrl",
psc->xscom_ctrl_size);
pnv_xscom_region_init(&sbe->xscom_mbox_regs, OBJECT(dev),
psc->xscom_mbox_ops, sbe, "xscom-sbe-mbox",
psc->xscom_mbox_size);
qdev_init_gpio_out(DEVICE(dev), &sbe->psi_irq, 1);
sbe->timer = timer_new_us(QEMU_CLOCK_VIRTUAL, sbe_timer, sbe);
}
static void pnv_sbe_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->realize = pnv_sbe_realize;
dc->desc = "PowerNV SBE Controller";
dc->user_creatable = false;
}
static const TypeInfo pnv_sbe_type_info = {
.name = TYPE_PNV_SBE,
.parent = TYPE_DEVICE,
.instance_size = sizeof(PnvSBE),
.class_init = pnv_sbe_class_init,
.class_size = sizeof(PnvSBEClass),
.abstract = true,
};
static void pnv_sbe_register_types(void)
{
type_register_static(&pnv_sbe_type_info);
type_register_static(&pnv_sbe_power9_type_info);
type_register_static(&pnv_sbe_power10_type_info);
}
type_init(pnv_sbe_register_types);
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