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|
/* Copyright 2013-2014 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
* limitations under the License.
*/
#define pr_fmt(fmt) "BT: " fmt
#include <skiboot.h>
#include <lpc.h>
#include <lock.h>
#include <device.h>
#include <timebase.h>
#include <ipmi.h>
#include <bt.h>
#include <timer.h>
#include <ipmi.h>
#include <timebase.h>
#include <chip.h>
#include <interrupts.h>
/* BT registers */
#define BT_CTRL 0
#define BT_CTRL_B_BUSY 0x80
#define BT_CTRL_H_BUSY 0x40
#define BT_CTRL_OEM0 0x20
#define BT_CTRL_SMS_ATN 0x10
#define BT_CTRL_B2H_ATN 0x08
#define BT_CTRL_H2B_ATN 0x04
#define BT_CTRL_CLR_RD_PTR 0x02
#define BT_CTRL_CLR_WR_PTR 0x01
#define BT_HOST2BMC 1
#define BT_INTMASK 2
#define BT_INTMASK_B2H_IRQEN 0x01
#define BT_INTMASK_B2H_IRQ 0x02
#define BT_INTMASK_BMC_HWRST 0x80
/* Maximum size of the HW FIFO */
#define BT_FIFO_LEN 64
/* Default poll interval before interrupts are working */
#define BT_DEFAULT_POLL_MS 200
/*
* Minimum size of an IPMI request/response including
* mandatory headers.
*/
#define BT_MIN_REQ_LEN 3
#define BT_MIN_RESP_LEN 4
/* How long (in uS) to poll for new ipmi data. */
#define POLL_TIMEOUT 10000
/* Maximum number of outstanding messages to allow in the queue. */
#define BT_MAX_QUEUE_LEN 10
/* How long (in seconds) before a message is timed out. */
#define BT_MSG_TIMEOUT 3
/* Maximum number of times to attempt sending a message before giving up. */
#define BT_MAX_RETRIES 1
/* Macro to enable printing BT message queue for debug */
#define BT_QUEUE_DEBUG 0
/* BT message logging macros */
#define _BT_Q_LOG(level, msg, fmt, args...) \
do { if (msg) \
prlog(level, "seq 0x%02x netfn 0x%02x cmd 0x%02x: " fmt "\n", \
(msg)->seq, ((msg)->ipmi_msg.netfn >> 2), (msg)->ipmi_msg.cmd, ##args); \
else \
prlog(level, "seq 0x?? netfn 0x?? cmd 0x??: " fmt "\n", ##args); \
} while (0)
#define BT_Q_ERR(msg, fmt, args...) \
_BT_Q_LOG(PR_ERR, msg, fmt, ##args)
#define BT_Q_DBG(msg, fmt, args...) \
_BT_Q_LOG(PR_DEBUG, msg, fmt, ##args)
#define BT_Q_INF(msg, fmt, args...) \
_BT_Q_LOG(PR_INFO, msg, fmt, ##args)
struct bt_msg {
struct list_node link;
unsigned long tb;
uint8_t seq;
uint8_t send_count;
struct ipmi_msg ipmi_msg;
};
struct bt_caps {
uint8_t num_requests;
uint16_t input_buf_len;
uint16_t output_buf_len;
uint8_t msg_timeout;
uint8_t max_retries;
};
struct bt {
uint32_t base_addr;
struct lock lock;
struct list_head msgq;
struct timer poller;
bool irq_ok;
int queue_len;
struct bt_caps caps;
};
static struct bt bt;
static int ipmi_seq;
static inline uint8_t bt_inb(uint32_t reg)
{
return lpc_inb(bt.base_addr + reg);
}
static inline void bt_outb(uint8_t data, uint32_t reg)
{
lpc_outb(data, bt.base_addr + reg);
}
static inline void bt_set_h_busy(bool value)
{
uint8_t rval;
rval = bt_inb(BT_CTRL);
if (value != !!(rval & BT_CTRL_H_BUSY))
bt_outb(BT_CTRL_H_BUSY, BT_CTRL);
}
static inline void bt_assert_h_busy(void)
{
uint8_t rval;
rval = bt_inb(BT_CTRL);
assert(rval & BT_CTRL_H_BUSY);
}
static void get_bt_caps_complete(struct ipmi_msg *msg)
{
/* Ignore errors, we'll fallback to using the defaults, no big deal */
if (msg->data[0] == 0) {
prlog(PR_DEBUG, "Got illegal BMC BT capability\n");
goto out;
}
if (msg->data[1] != BT_FIFO_LEN) {
prlog(PR_DEBUG, "Got a input buffer len (%u) cap which differs from the default\n",
msg->data[1]);
}
if (msg->data[2] != BT_FIFO_LEN) {
prlog(PR_DEBUG, "Got a output buffer len (%u) cap which differs from the default\n",
msg->data[2]);
}
/*
* IPMI Spec says that the value for buffer sizes are:
* "the largest value allowed in first byte"
* Therefore we want to add one to what we get
*/
bt.caps.num_requests = msg->data[0];
bt.caps.input_buf_len = msg->data[1] + 1;
bt.caps.output_buf_len = msg->data[2] + 1;
bt.caps.msg_timeout = msg->data[3];
bt.caps.max_retries = msg->data[4];
prlog(PR_DEBUG, "BMC BT capabilities received:\n");
prlog(PR_DEBUG, "buffer sizes: %d input %d output\n",
bt.caps.input_buf_len, bt.caps.output_buf_len);
prlog(PR_DEBUG, "number of requests: %d\n", bt.caps.num_requests);
prlog(PR_DEBUG, "msg timeout: %d max retries: %d\n",
bt.caps.msg_timeout, bt.caps.max_retries);
out:
ipmi_free_msg(msg);
}
static void get_bt_caps(void)
{
struct ipmi_msg *bmc_caps;
/*
* Didn't sent a message, now is a good time to ask the BMC for its
* capabilities.
*/
bmc_caps = ipmi_mkmsg(IPMI_DEFAULT_INTERFACE, IPMI_GET_BT_CAPS,
get_bt_caps_complete, NULL, NULL, 0, sizeof(struct bt_caps));
if (!bmc_caps)
prerror("Couldn't create BMC BT capabilities msg\n");
if (bmc_caps && ipmi_queue_msg(bmc_caps))
prerror("Couldn't enqueue request for BMC BT capabilities\n");
/* Ignore errors, we'll fallback to using the defaults, no big deal */
}
static inline bool bt_idle(void)
{
uint8_t bt_ctrl = bt_inb(BT_CTRL);
return !(bt_ctrl & BT_CTRL_B_BUSY) && !(bt_ctrl & BT_CTRL_H2B_ATN);
}
/* Must be called with bt.lock held */
static void bt_msg_del(struct bt_msg *bt_msg)
{
list_del(&bt_msg->link);
bt.queue_len--;
unlock(&bt.lock);
ipmi_cmd_done(bt_msg->ipmi_msg.cmd,
IPMI_NETFN_RETURN_CODE(bt_msg->ipmi_msg.netfn),
IPMI_TIMEOUT_ERR, &bt_msg->ipmi_msg);
lock(&bt.lock);
}
static void bt_init_interface(void)
{
/* Clear interrupt condition & enable irq */
bt_outb(BT_INTMASK_B2H_IRQ | BT_INTMASK_B2H_IRQEN, BT_INTMASK);
/* Take care of a stable H_BUSY if any */
bt_set_h_busy(false);
}
static void bt_reset_interface(void)
{
bt_outb(BT_INTMASK_BMC_HWRST, BT_INTMASK);
bt_init_interface();
}
/*
* Try and send a message from the message queue. Caller must hold
* bt.bt_lock and bt.lock and ensue the message queue is not
* empty.
*/
static void bt_send_msg(struct bt_msg *bt_msg)
{
int i;
struct ipmi_msg *ipmi_msg;
ipmi_msg = &bt_msg->ipmi_msg;
/* Send the message */
bt_outb(BT_CTRL_CLR_WR_PTR, BT_CTRL);
/* Byte 1 - Length */
bt_outb(ipmi_msg->req_size + BT_MIN_REQ_LEN, BT_HOST2BMC);
/* Byte 2 - NetFn/LUN */
bt_outb(ipmi_msg->netfn, BT_HOST2BMC);
/* Byte 3 - Seq */
bt_outb(bt_msg->seq, BT_HOST2BMC);
/* Byte 4 - Cmd */
bt_outb(ipmi_msg->cmd, BT_HOST2BMC);
/* Byte 5:N - Data */
for (i = 0; i < ipmi_msg->req_size; i++)
bt_outb(ipmi_msg->data[i], BT_HOST2BMC);
BT_Q_DBG(bt_msg, "Message sent to host");
bt_msg->send_count++;
bt_outb(BT_CTRL_H2B_ATN, BT_CTRL);
return;
}
static void bt_clear_fifo(void)
{
int i;
for (i = 0; i < bt.caps.input_buf_len; i++)
bt_outb(0xff, BT_HOST2BMC);
}
static void bt_flush_msg(void)
{
bt_assert_h_busy();
bt_outb(BT_CTRL_B2H_ATN | BT_CTRL_CLR_RD_PTR | BT_CTRL_CLR_WR_PTR, BT_CTRL);
bt_clear_fifo();
/* Can't hurt to clear the write pointer again, just to be sure */
bt_outb(BT_CTRL_CLR_WR_PTR, BT_CTRL);
bt_set_h_busy(false);
}
static void bt_get_resp(void)
{
int i;
struct bt_msg *tmp_bt_msg, *bt_msg = NULL;
struct ipmi_msg *ipmi_msg;
uint8_t resp_len, netfn, seq, cmd;
uint8_t cc = IPMI_CC_NO_ERROR;
/* Indicate to the BMC that we are busy */
bt_set_h_busy(true);
/* Clear B2H_ATN and read pointer */
bt_outb(BT_CTRL_B2H_ATN, BT_CTRL);
bt_outb(BT_CTRL_CLR_RD_PTR, BT_CTRL);
/* Read the response */
/* Byte 1 - Length (includes header size) */
resp_len = bt_inb(BT_HOST2BMC) - BT_MIN_RESP_LEN;
/* Byte 2 - NetFn/LUN */
netfn = bt_inb(BT_HOST2BMC);
/* Byte 3 - Seq */
seq = bt_inb(BT_HOST2BMC);
/* Byte 4 - Cmd */
cmd = bt_inb(BT_HOST2BMC);
/* Byte 5 - Completion Code */
cc = bt_inb(BT_HOST2BMC);
/* Find the corresponding message */
list_for_each(&bt.msgq, tmp_bt_msg, link) {
if (tmp_bt_msg->seq == seq) {
bt_msg = tmp_bt_msg;
break;
}
}
if (!bt_msg) {
/* A response to a message we no longer care about. */
prlog(PR_INFO, "Nobody cared about a response to an BT/IPMI message"
"(seq 0x%02x netfn 0x%02x cmd 0x%02x)\n", seq, (netfn >> 2), cmd);
bt_flush_msg();
return;
}
ipmi_msg = &bt_msg->ipmi_msg;
/*
* Make sure we have enough room to store the response. As all values
* are unsigned we will also trigger this error if
* bt_inb(BT_HOST2BMC) < BT_MIN_RESP_LEN (which should never occur).
*/
if (resp_len > ipmi_msg->resp_size) {
BT_Q_ERR(bt_msg, "Invalid resp_len %d", resp_len);
resp_len = ipmi_msg->resp_size;
cc = IPMI_ERR_MSG_TRUNCATED;
}
ipmi_msg->resp_size = resp_len;
/* Byte 6:N - Data */
for (i = 0; i < resp_len; i++)
ipmi_msg->data[i] = bt_inb(BT_HOST2BMC);
bt_set_h_busy(false);
BT_Q_DBG(bt_msg, "IPMI MSG done");
list_del(&bt_msg->link);
bt.queue_len--;
unlock(&bt.lock);
/* Call IPMI layer to finish processing the message. */
ipmi_cmd_done(cmd, netfn, cc, ipmi_msg);
lock(&bt.lock);
return;
}
static void bt_expire_old_msg(uint64_t tb)
{
struct bt_msg *bt_msg;
bt_msg = list_top(&bt.msgq, struct bt_msg, link);
if (bt_msg && bt_msg->tb > 0 && !chip_quirk(QUIRK_SIMICS) &&
(tb_compare(tb, bt_msg->tb +
secs_to_tb(bt.caps.msg_timeout)) == TB_AAFTERB)) {
if (bt_msg->send_count <= bt.caps.max_retries) {
/* A message timeout is usually due to the BMC
* clearing the H2B_ATN flag without actually
* doing anything. The data will still be in the
* FIFO so just reset the flag.*/
BT_Q_ERR(bt_msg, "Retry sending message");
bt_msg->send_count++;
bt_msg->tb = tb;
bt_outb(BT_CTRL_H2B_ATN, BT_CTRL);
} else {
BT_Q_ERR(bt_msg, "Timeout sending message");
bt_msg_del(bt_msg);
/*
* Timing out a message is inherently racy as the BMC
* may start writing just as we decide to kill the
* message. Hopefully resetting the interface is
* sufficient to guard against such things.
*/
bt_reset_interface();
}
}
}
static void print_debug_queue_info(void)
{
#if BT_QUEUE_DEBUG
struct bt_msg *msg;
static bool printed;
if (!list_empty(&bt.msgq)) {
printed = false;
prlog(PR_DEBUG, "-------- BT Msg Queue --------\n");
list_for_each(&bt.msgq, msg, link) {
BT_Q_DBG(msg, "[ sent %d ]", msg->send_count);
}
prlog(PR_DEBUG, "-----------------------------\n");
} else if (!printed) {
printed = true;
prlog(PR_DEBUG, "----- BT Msg Queue Empty -----\n");
}
#endif
}
static void bt_send_and_unlock(void)
{
if (lpc_ok() && !list_empty(&bt.msgq)) {
struct bt_msg *bt_msg;
bt_msg = list_top(&bt.msgq, struct bt_msg, link);
assert(bt_msg);
/*
* Start the message timeout once it gets to the top
* of the queue. This will ensure we timeout messages
* in the case of a broken bt interface as occurs when
* the BMC is not responding to any IPMI messages.
*/
if (bt_msg->tb == 0)
bt_msg->tb = mftb();
/*
* Only send it if we haven't already.
* Timeouts and retries happen in bt_expire_old_msg()
* called from bt_poll()
*/
if (bt_idle() && bt_msg->send_count == 0)
bt_send_msg(bt_msg);
}
unlock(&bt.lock);
}
static void bt_poll(struct timer *t __unused, void *data __unused,
uint64_t now)
{
uint8_t bt_ctrl;
/* Don't do anything if the LPC bus is offline */
if (!lpc_ok())
return;
/*
* If we can't get the lock assume someone else will notice
* the new message and process it.
*/
lock(&bt.lock);
print_debug_queue_info();
bt_ctrl = bt_inb(BT_CTRL);
/* Is there a response waiting for us? */
if (bt_ctrl & BT_CTRL_B2H_ATN)
bt_get_resp();
bt_expire_old_msg(now);
/* Check for sms_atn */
if (bt_inb(BT_CTRL) & BT_CTRL_SMS_ATN) {
bt_outb(BT_CTRL_SMS_ATN, BT_CTRL);
unlock(&bt.lock);
ipmi_sms_attention();
lock(&bt.lock);
}
/*
* Send messages if we can. If the BMC was really quick we
* could loop back to the start and check for a response
* instead of unlocking, but testing shows the BMC isn't that
* fast so we will wait for the IRQ or a call to the pollers instead.
*/
bt_send_and_unlock();
schedule_timer(&bt.poller,
bt.irq_ok ? TIMER_POLL : msecs_to_tb(BT_DEFAULT_POLL_MS));
}
static void bt_add_msg(struct bt_msg *bt_msg)
{
bt_msg->tb = 0;
bt_msg->seq = ipmi_seq++;
bt_msg->send_count = 0;
bt.queue_len++;
if (bt.queue_len > BT_MAX_QUEUE_LEN) {
/* Maximum queue length exceeded, remove oldest messages. */
BT_Q_ERR(bt_msg, "Maximum queue length exceeded");
bt_msg = list_tail(&bt.msgq, struct bt_msg, link);
assert(bt_msg);
BT_Q_ERR(bt_msg, "Removed from queue");
bt_msg_del(bt_msg);
}
}
static int bt_add_ipmi_msg_head(struct ipmi_msg *ipmi_msg)
{
struct bt_msg *bt_msg = container_of(ipmi_msg, struct bt_msg, ipmi_msg);
lock(&bt.lock);
bt_add_msg(bt_msg);
list_add(&bt.msgq, &bt_msg->link);
bt_send_and_unlock();
return 0;
}
static int bt_add_ipmi_msg(struct ipmi_msg *ipmi_msg)
{
struct bt_msg *bt_msg = container_of(ipmi_msg, struct bt_msg, ipmi_msg);
lock(&bt.lock);
bt_add_msg(bt_msg);
list_add_tail(&bt.msgq, &bt_msg->link);
bt_send_and_unlock();
return 0;
}
static void bt_irq(uint32_t chip_id __unused, uint32_t irq_mask __unused)
{
uint8_t ireg;
ireg = bt_inb(BT_INTMASK);
bt.irq_ok = true;
if (ireg & BT_INTMASK_B2H_IRQ) {
bt_outb(BT_INTMASK_B2H_IRQ | BT_INTMASK_B2H_IRQEN, BT_INTMASK);
bt_poll(NULL, NULL, mftb());
}
}
/*
* Allocate an ipmi message and bt container and return the ipmi
* message struct. Allocates enough space for the request and response
* data.
*/
static struct ipmi_msg *bt_alloc_ipmi_msg(size_t request_size, size_t response_size)
{
struct bt_msg *bt_msg;
bt_msg = zalloc(sizeof(struct bt_msg) + MAX(request_size, response_size));
if (!bt_msg)
return NULL;
bt_msg->ipmi_msg.req_size = request_size;
bt_msg->ipmi_msg.resp_size = response_size;
bt_msg->ipmi_msg.data = (uint8_t *) (bt_msg + 1);
return &bt_msg->ipmi_msg;
}
/*
* Free a previously allocated ipmi message.
*/
static void bt_free_ipmi_msg(struct ipmi_msg *ipmi_msg)
{
struct bt_msg *bt_msg = container_of(ipmi_msg, struct bt_msg, ipmi_msg);
free(bt_msg);
}
/*
* Remove a message from the queue. The memory allocated for the ipmi message
* will need to be freed by the caller with bt_free_ipmi_msg() as it will no
* longer be in the queue of messages.
*/
static int bt_del_ipmi_msg(struct ipmi_msg *ipmi_msg)
{
struct bt_msg *bt_msg = container_of(ipmi_msg, struct bt_msg, ipmi_msg);
lock(&bt.lock);
list_del_from(&bt.msgq, &bt_msg->link);
bt.queue_len--;
bt_send_and_unlock();
return 0;
}
static struct ipmi_backend bt_backend = {
.alloc_msg = bt_alloc_ipmi_msg,
.free_msg = bt_free_ipmi_msg,
.queue_msg = bt_add_ipmi_msg,
.queue_msg_head = bt_add_ipmi_msg_head,
.dequeue_msg = bt_del_ipmi_msg,
};
static struct lpc_client bt_lpc_client = {
.interrupt = bt_irq,
};
void bt_init(void)
{
struct dt_node *n;
const struct dt_property *prop;
uint32_t irq;
/* Set sane capability defaults */
bt.caps.num_requests = 1;
bt.caps.input_buf_len = BT_FIFO_LEN;
bt.caps.output_buf_len = BT_FIFO_LEN;
bt.caps.msg_timeout = BT_MSG_TIMEOUT;
bt.caps.max_retries = BT_MAX_RETRIES;
/* We support only one */
n = dt_find_compatible_node(dt_root, NULL, "ipmi-bt");
if (!n) {
prerror("No BT device\n");
return;
}
/* Get IO base */
prop = dt_find_property(n, "reg");
if (!prop) {
prerror("Can't find reg property\n");
return;
}
if (dt_property_get_cell(prop, 0) != OPAL_LPC_IO) {
prerror("Only supports IO addresses\n");
return;
}
bt.base_addr = dt_property_get_cell(prop, 1);
init_timer(&bt.poller, bt_poll, NULL);
bt_init_interface();
init_lock(&bt.lock);
/*
* The iBT interface comes up in the busy state until the daemon has
* initialised it.
*/
list_head_init(&bt.msgq);
bt.queue_len = 0;
prlog(PR_NOTICE, "Interface initialized, IO 0x%04x\n", bt.base_addr);
ipmi_register_backend(&bt_backend);
/*
* We initially schedule the poller as a relatively fast timer, at
* least until we have at least one interrupt occurring at which
* point we turn it into a background poller
*/
schedule_timer(&bt.poller, msecs_to_tb(BT_DEFAULT_POLL_MS));
irq = dt_prop_get_u32(n, "interrupts");
bt_lpc_client.interrupts = LPC_IRQ(irq);
lpc_register_client(dt_get_chip_id(n), &bt_lpc_client,
IRQ_ATTR_TARGET_OPAL);
/* Enqueue an IPMI message to ask the BMC about its BT capabilities */
get_bt_caps();
prlog(PR_DEBUG, "Using LPC IRQ %d\n", irq);
}
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