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/* Copyright 2014-2019 IBM Corp.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
* implied.
* See the License for the specific language governing permissions and
* imitations under the License.
*/
#include <skiboot.h>
#include <opal.h>
#include <lock.h>
#include <xscom.h>
#include <chip.h>
#include <opal-msg.h>
#include <fsp.h>
#include <mem_region.h>
#include <prd-fw-msg.h>
#include <hostservices.h>
enum events {
EVENT_ATTN = 1 << 0,
EVENT_OCC_ERROR = 1 << 1,
EVENT_OCC_RESET = 1 << 2,
EVENT_SBE_PASSTHROUGH = 1 << 3,
EVENT_FSP_OCC_RESET = 1 << 4,
EVENT_FSP_OCC_LOAD_START = 1 << 5,
};
static uint8_t events[MAX_CHIPS];
static uint64_t ipoll_status[MAX_CHIPS];
static uint8_t _prd_msg_buf[sizeof(struct opal_prd_msg) +
sizeof(struct prd_fw_msg)];
static struct opal_prd_msg *prd_msg = (struct opal_prd_msg *)&_prd_msg_buf;
static bool prd_msg_inuse, prd_active;
static struct dt_node *prd_node;
static bool prd_enabled = false;
/* Locking:
*
* The events lock serialises access to the events, ipoll_status,
* prd_msg_inuse, and prd_active variables.
*
* The ipoll_lock protects against concurrent updates to the ipoll registers.
*
* The ipoll_lock may be acquired with events_lock held. This order must
* be preserved.
*/
static struct lock events_lock = LOCK_UNLOCKED;
static struct lock ipoll_lock = LOCK_UNLOCKED;
static uint64_t prd_ipoll_mask_reg;
static uint64_t prd_ipoll_status_reg;
static uint64_t prd_ipoll_mask;
/* PRD registers */
#define PRD_P8_IPOLL_REG_MASK 0x01020013
#define PRD_P8_IPOLL_REG_STATUS 0x01020014
#define PRD_P8_IPOLL_XSTOP PPC_BIT(0) /* Xstop for host/core/millicode */
#define PRD_P8_IPOLL_RECOV PPC_BIT(1) /* Recoverable */
#define PRD_P8_IPOLL_SPEC_ATTN PPC_BIT(2) /* Special attention */
#define PRD_P8_IPOLL_HOST_ATTN PPC_BIT(3) /* Host attention */
#define PRD_P8_IPOLL_MASK PPC_BITMASK(0, 3)
#define PRD_P9_IPOLL_REG_MASK 0x000F0033
#define PRD_P9_IPOLL_REG_STATUS 0x000F0034
#define PRD_P9_IPOLL_XSTOP PPC_BIT(0) /* Xstop for host/core/millicode */
#define PRD_P9_IPOLL_RECOV PPC_BIT(1) /* Recoverable */
#define PRD_P9_IPOLL_SPEC_ATTN PPC_BIT(2) /* Special attention */
#define PRD_P9_IPOLL_UNIT_CS PPC_BIT(3) /* Unit Xstop */
#define PRD_P9_IPOLL_HOST_ATTN PPC_BIT(4) /* Host attention */
#define PRD_P9_IPOLL_MASK_INTR PPC_BIT(5) /* Host interrupt */
#define PRD_P9_IPOLL_MASK PPC_BITMASK(0, 5)
static void send_next_pending_event(void);
static void prd_msg_consumed(void *data, int status __unused)
{
struct opal_prd_msg *msg = data;
uint32_t proc;
uint8_t event = 0;
lock(&events_lock);
switch (msg->hdr.type) {
case OPAL_PRD_MSG_TYPE_ATTN:
proc = msg->attn.proc;
/* If other ipoll events have been received in the time
* between prd_msg creation and consumption, we'll need to
* raise a separate ATTN message for those. So, we only
* clear the event if we don't have any further ipoll_status
* bits.
*/
ipoll_status[proc] &= ~msg->attn.ipoll_status;
if (!ipoll_status[proc])
event = EVENT_ATTN;
break;
case OPAL_PRD_MSG_TYPE_OCC_ERROR:
proc = msg->occ_error.chip;
event = EVENT_OCC_ERROR;
break;
case OPAL_PRD_MSG_TYPE_OCC_RESET:
proc = msg->occ_reset.chip;
event = EVENT_OCC_RESET;
break;
case OPAL_PRD_MSG_TYPE_FIRMWARE_RESPONSE:
break;
case OPAL_PRD_MSG_TYPE_SBE_PASSTHROUGH:
proc = msg->sbe_passthrough.chip;
event = EVENT_SBE_PASSTHROUGH;
break;
case OPAL_PRD_MSG_TYPE_FSP_OCC_RESET:
proc = msg->occ_reset.chip;
event = EVENT_FSP_OCC_RESET;
break;
case OPAL_PRD_MSG_TYPE_FSP_OCC_LOAD_START:
proc = msg->occ_reset.chip;
event = EVENT_FSP_OCC_LOAD_START;
break;
default:
prlog(PR_ERR, "PRD: invalid msg consumed, type: 0x%x\n",
msg->hdr.type);
}
if (event)
events[proc] &= ~event;
prd_msg_inuse = false;
send_next_pending_event();
unlock(&events_lock);
}
static int populate_ipoll_msg(struct opal_prd_msg *msg, uint32_t proc)
{
uint64_t ipoll_mask;
int rc;
lock(&ipoll_lock);
rc = xscom_read(proc, prd_ipoll_mask_reg, &ipoll_mask);
unlock(&ipoll_lock);
if (rc) {
prlog(PR_ERR, "PRD: Unable to read ipoll status (chip %d)!\n",
proc);
return -1;
}
msg->attn.proc = proc;
msg->attn.ipoll_status = ipoll_status[proc];
msg->attn.ipoll_mask = ipoll_mask;
return 0;
}
static void send_next_pending_event(void)
{
struct proc_chip *chip;
uint32_t proc;
uint8_t event;
assert(!prd_msg_inuse);
if (!prd_active)
return;
event = 0;
for_each_chip(chip) {
proc = chip->id;
if (events[proc]) {
event = events[proc];
break;
}
}
if (!event)
return;
prd_msg_inuse = true;
prd_msg->token = 0;
prd_msg->hdr.size = sizeof(*prd_msg);
if (event & EVENT_ATTN) {
prd_msg->hdr.type = OPAL_PRD_MSG_TYPE_ATTN;
populate_ipoll_msg(prd_msg, proc);
} else if (event & EVENT_OCC_ERROR) {
prd_msg->hdr.type = OPAL_PRD_MSG_TYPE_OCC_ERROR;
prd_msg->occ_error.chip = proc;
} else if (event & EVENT_OCC_RESET) {
prd_msg->hdr.type = OPAL_PRD_MSG_TYPE_OCC_RESET;
prd_msg->occ_reset.chip = proc;
occ_msg_queue_occ_reset();
} else if (event & EVENT_SBE_PASSTHROUGH) {
prd_msg->hdr.type = OPAL_PRD_MSG_TYPE_SBE_PASSTHROUGH;
prd_msg->sbe_passthrough.chip = proc;
} else if (event & EVENT_FSP_OCC_RESET) {
prd_msg->hdr.type = OPAL_PRD_MSG_TYPE_FSP_OCC_RESET;
prd_msg->occ_reset.chip = proc;
} else if (event & EVENT_FSP_OCC_LOAD_START) {
prd_msg->hdr.type = OPAL_PRD_MSG_TYPE_FSP_OCC_LOAD_START;
prd_msg->occ_reset.chip = proc;
}
/*
* We always need to handle PSI interrupts, but if the is PRD is
* disabled then we shouldn't propagate PRD events to the host.
*/
if (prd_enabled)
_opal_queue_msg(OPAL_MSG_PRD, prd_msg, prd_msg_consumed,
prd_msg->hdr.size, prd_msg);
}
static void __prd_event(uint32_t proc, uint8_t event)
{
events[proc] |= event;
if (!prd_msg_inuse)
send_next_pending_event();
}
static void prd_event(uint32_t proc, uint8_t event)
{
lock(&events_lock);
__prd_event(proc, event);
unlock(&events_lock);
}
static int __ipoll_update_mask(uint32_t proc, bool set, uint64_t bits)
{
uint64_t mask;
int rc;
rc = xscom_read(proc, prd_ipoll_mask_reg, &mask);
if (rc)
return rc;
if (set)
mask |= bits;
else
mask &= ~bits;
return xscom_write(proc, prd_ipoll_mask_reg, mask);
}
static int ipoll_record_and_mask_pending(uint32_t proc)
{
uint64_t status;
int rc;
lock(&ipoll_lock);
rc = xscom_read(proc, prd_ipoll_status_reg, &status);
status &= prd_ipoll_mask;
if (!rc)
__ipoll_update_mask(proc, true, status);
unlock(&ipoll_lock);
if (!rc)
ipoll_status[proc] |= status;
return rc;
}
/* Entry point for interrupts */
void prd_psi_interrupt(uint32_t proc)
{
int rc;
lock(&events_lock);
rc = ipoll_record_and_mask_pending(proc);
if (rc)
prlog(PR_ERR, "PRD: Failed to update IPOLL mask\n");
__prd_event(proc, EVENT_ATTN);
unlock(&events_lock);
}
void prd_tmgt_interrupt(uint32_t proc)
{
prd_event(proc, EVENT_OCC_ERROR);
}
void prd_occ_reset(uint32_t proc)
{
prd_event(proc, EVENT_OCC_RESET);
}
void prd_fsp_occ_reset(uint32_t proc)
{
prd_event(proc, EVENT_FSP_OCC_RESET);
}
void prd_sbe_passthrough(uint32_t proc)
{
prd_event(proc, EVENT_SBE_PASSTHROUGH);
}
void prd_fsp_occ_load_start(uint32_t proc)
{
prd_event(proc, EVENT_FSP_OCC_LOAD_START);
}
/* incoming message handlers */
static int prd_msg_handle_attn_ack(struct opal_prd_msg *msg)
{
int rc;
lock(&ipoll_lock);
rc = __ipoll_update_mask(msg->attn_ack.proc, false,
msg->attn_ack.ipoll_ack & prd_ipoll_mask);
unlock(&ipoll_lock);
if (rc)
prlog(PR_ERR, "PRD: Unable to unmask ipoll!\n");
return rc;
}
static int prd_msg_handle_init(struct opal_prd_msg *msg)
{
struct proc_chip *chip;
lock(&ipoll_lock);
for_each_chip(chip) {
__ipoll_update_mask(chip->id, false,
msg->init.ipoll & prd_ipoll_mask);
}
unlock(&ipoll_lock);
/* we're transitioning from inactive to active; send any pending tmgt
* interrupts */
lock(&events_lock);
prd_active = true;
if (!prd_msg_inuse)
send_next_pending_event();
unlock(&events_lock);
return OPAL_SUCCESS;
}
static int prd_msg_handle_fini(void)
{
struct proc_chip *chip;
lock(&events_lock);
prd_active = false;
unlock(&events_lock);
lock(&ipoll_lock);
for_each_chip(chip) {
__ipoll_update_mask(chip->id, true, prd_ipoll_mask);
}
unlock(&ipoll_lock);
return OPAL_SUCCESS;
}
static int prd_msg_handle_firmware_req(struct opal_prd_msg *msg)
{
unsigned long fw_req_len, fw_resp_len;
struct prd_fw_msg *fw_req, *fw_resp;
int rc;
fw_req_len = be64_to_cpu(msg->fw_req.req_len);
fw_resp_len = be64_to_cpu(msg->fw_req.resp_len);
fw_req = (struct prd_fw_msg *)msg->fw_req.data;
/* do we have a full firmware message? */
if (fw_req_len < sizeof(struct prd_fw_msg))
return -EINVAL;
/* does the total (outer) PRD message len provide enough data for the
* claimed (inner) FW message?
*/
if (msg->hdr.size < fw_req_len +
offsetof(struct opal_prd_msg, fw_req.data))
return -EINVAL;
/* is there enough response buffer for a base response? Type-specific
* responses may be larger, but anything less than BASE_SIZE is
* invalid. */
if (fw_resp_len < PRD_FW_MSG_BASE_SIZE)
return -EINVAL;
/* prepare a response message. */
lock(&events_lock);
prd_msg_inuse = true;
prd_msg->token = 0;
prd_msg->hdr.type = OPAL_PRD_MSG_TYPE_FIRMWARE_RESPONSE;
fw_resp = (void *)prd_msg->fw_resp.data;
switch (be64_to_cpu(fw_req->type)) {
case PRD_FW_MSG_TYPE_REQ_NOP:
fw_resp->type = cpu_to_be64(PRD_FW_MSG_TYPE_RESP_NOP);
prd_msg->fw_resp.len = cpu_to_be64(PRD_FW_MSG_BASE_SIZE);
prd_msg->hdr.size = cpu_to_be16(sizeof(*prd_msg));
rc = 0;
break;
case PRD_FW_MSG_TYPE_ERROR_LOG:
rc = hservice_send_error_log(fw_req->errorlog.plid,
fw_req->errorlog.size,
fw_req->errorlog.data);
/* Return generic response to HBRT */
fw_resp->type = cpu_to_be64(PRD_FW_MSG_TYPE_RESP_GENERIC);
fw_resp->generic_resp.status = cpu_to_be64(rc);
prd_msg->fw_resp.len = cpu_to_be64(PRD_FW_MSG_BASE_SIZE +
sizeof(fw_resp->generic_resp));
prd_msg->hdr.size = cpu_to_be16(sizeof(*prd_msg));
rc = 0;
break;
default:
prlog(PR_DEBUG, "PRD: Unsupported fw_request type : 0x%llx\n",
be64_to_cpu(fw_req->type));
rc = -ENOSYS;
}
if (!rc)
rc = _opal_queue_msg(OPAL_MSG_PRD, prd_msg, prd_msg_consumed,
prd_msg->hdr.size, prd_msg);
else
prd_msg_inuse = false;
unlock(&events_lock);
return rc;
}
/* Entry from the host above */
static int64_t opal_prd_msg(struct opal_prd_msg *msg)
{
int rc;
/* fini is a little special: the kernel (which may not have the entire
* opal_prd_msg definition) can send a FINI message, so we don't check
* the full size */
if (msg->hdr.size >= sizeof(struct opal_prd_msg_header) &&
msg->hdr.type == OPAL_PRD_MSG_TYPE_FINI)
return prd_msg_handle_fini();
if (msg->hdr.size < sizeof(*msg))
return OPAL_PARAMETER;
switch (msg->hdr.type) {
case OPAL_PRD_MSG_TYPE_INIT:
rc = prd_msg_handle_init(msg);
break;
case OPAL_PRD_MSG_TYPE_ATTN_ACK:
rc = prd_msg_handle_attn_ack(msg);
break;
case OPAL_PRD_MSG_TYPE_OCC_RESET_NOTIFY:
rc = occ_msg_queue_occ_reset();
break;
case OPAL_PRD_MSG_TYPE_FIRMWARE_REQUEST:
rc = prd_msg_handle_firmware_req(msg);
break;
case OPAL_PRD_MSG_TYPE_FSP_OCC_RESET_STATUS:
rc = fsp_occ_reset_status(msg->fsp_occ_reset_status.chip,
msg->fsp_occ_reset_status.status);
break;
case OPAL_PRD_MSG_TYPE_CORE_SPECIAL_WAKEUP:
rc = hservice_wakeup(msg->spl_wakeup.core,
msg->spl_wakeup.mode);
break;
case OPAL_PRD_MSG_TYPE_FSP_OCC_LOAD_START_STATUS:
rc = fsp_occ_load_start_status(msg->fsp_occ_reset_status.chip,
msg->fsp_occ_reset_status.status);
break;
default:
prlog(PR_DEBUG, "PRD: Unsupported prd message type : 0x%x\n",
msg->hdr.type);
rc = OPAL_UNSUPPORTED;
}
return rc;
}
/*
* Initialise the Opal backend for the PRD daemon. This must be called from
* platform probe or init function.
*/
void prd_init(void)
{
struct proc_chip *chip;
switch (proc_gen) {
case proc_gen_p8:
prd_ipoll_mask_reg = PRD_P8_IPOLL_REG_MASK;
prd_ipoll_status_reg = PRD_P8_IPOLL_REG_STATUS;
prd_ipoll_mask = PRD_P8_IPOLL_MASK;
break;
case proc_gen_p9:
prd_ipoll_mask_reg = PRD_P9_IPOLL_REG_MASK;
prd_ipoll_status_reg = PRD_P9_IPOLL_REG_STATUS;
prd_ipoll_mask = PRD_P9_IPOLL_MASK;
break;
default:
assert(0);
}
/* mask everything */
lock(&ipoll_lock);
for_each_chip(chip) {
__ipoll_update_mask(chip->id, true, prd_ipoll_mask);
}
unlock(&ipoll_lock);
prd_enabled = true;
opal_register(OPAL_PRD_MSG, opal_prd_msg, 1);
prd_node = dt_new(opal_node, "diagnostics");
dt_add_property_strings(prd_node, "compatible", "ibm,opal-prd");
}
void prd_register_reserved_memory(void)
{
struct mem_region *region;
if (!prd_node)
return;
lock(&mem_region_lock);
for (region = mem_region_next(NULL); region;
region = mem_region_next(region)) {
if (region->type != REGION_FW_RESERVED)
continue;
if (!region->node)
continue;
if (!dt_find_property(region->node, "ibm,prd-label")) {
dt_add_property_string(region->node, "ibm,prd-label",
region->name);
}
}
unlock(&mem_region_lock);
}
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