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Date: Thu, 14 Feb 2008 12:32:31 -0600
From: Corey Minyard <minyard@....org>
To: Linux Kernel <linux-kernel@...r.kernel.org>
Cc: Andrew Morton <akpm@...l.org>,
OpenIPMI Developers <openipmi-developer@...ts.sourceforge.net>
Subject: [PATCH 4/4] IPMI: Convert locked counters to atomics in the system
interface
From: Corey Minyard <cminyard@...sta.com>
Atomics are faster and neater than locked counters.
Signed-off-by: Corey Minyard <cminyard@...sta.com>
---
Index: linux-2.6.24/drivers/char/ipmi/ipmi_si_intf.c
===================================================================
--- linux-2.6.24.orig/drivers/char/ipmi/ipmi_si_intf.c
+++ linux-2.6.24/drivers/char/ipmi/ipmi_si_intf.c
@@ -120,6 +120,27 @@ static struct device_driver ipmi_driver
.bus = &platform_bus_type
};
+
+/*
+ * Indexes into stats[] in smi_info below.
+ */
+
+#define SI_STAT_short_timeouts 0
+#define SI_STAT_long_timeouts 1
+#define SI_STAT_timeout_restarts 2
+#define SI_STAT_idles 3
+#define SI_STAT_interrupts 4
+#define SI_STAT_attentions 5
+#define SI_STAT_flag_fetches 6
+#define SI_STAT_hosed_count 7
+#define SI_STAT_complete_transactions 8
+#define SI_STAT_events 9
+#define SI_STAT_watchdog_pretimeouts 10
+#define SI_STAT_incoming_messages 11
+
+/* If you add a stat, you must update this value. */
+#define SI_NUM_STATS 12
+
struct smi_info
{
int intf_num;
@@ -216,25 +237,18 @@ struct smi_info
unsigned char slave_addr;
/* Counters and things for the proc filesystem. */
- spinlock_t count_lock;
- unsigned long short_timeouts;
- unsigned long long_timeouts;
- unsigned long timeout_restarts;
- unsigned long idles;
- unsigned long interrupts;
- unsigned long attentions;
- unsigned long flag_fetches;
- unsigned long hosed_count;
- unsigned long complete_transactions;
- unsigned long events;
- unsigned long watchdog_pretimeouts;
- unsigned long incoming_messages;
+ atomic_t stats[SI_NUM_STATS];
struct task_struct *thread;
struct list_head link;
};
+#define smi_inc_stat(smi, stat) \
+ atomic_inc(&(smi)->stats[SI_STAT_ ## stat])
+#define smi_get_stat(smi, stat) \
+ ((unsigned int) atomic_read(&(smi)->stats[SI_STAT_ ## stat]))
+
#define SI_MAX_PARMS 4
static int force_kipmid[SI_MAX_PARMS];
@@ -398,9 +412,7 @@ static void handle_flags(struct smi_info
retry:
if (smi_info->msg_flags & WDT_PRE_TIMEOUT_INT) {
/* Watchdog pre-timeout */
- spin_lock(&smi_info->count_lock);
- smi_info->watchdog_pretimeouts++;
- spin_unlock(&smi_info->count_lock);
+ smi_inc_stat(smi_info, watchdog_pretimeouts);
start_clear_flags(smi_info);
smi_info->msg_flags &= ~WDT_PRE_TIMEOUT_INT;
@@ -545,9 +557,7 @@ static void handle_transaction_done(stru
smi_info->msg_flags &= ~EVENT_MSG_BUFFER_FULL;
handle_flags(smi_info);
} else {
- spin_lock(&smi_info->count_lock);
- smi_info->events++;
- spin_unlock(&smi_info->count_lock);
+ smi_inc_stat(smi_info, events);
/* Do this before we deliver the message
because delivering the message releases the
@@ -581,9 +591,7 @@ static void handle_transaction_done(stru
smi_info->msg_flags &= ~RECEIVE_MSG_AVAIL;
handle_flags(smi_info);
} else {
- spin_lock(&smi_info->count_lock);
- smi_info->incoming_messages++;
- spin_unlock(&smi_info->count_lock);
+ smi_inc_stat(smi_info, incoming_messages);
/* Do this before we deliver the message
because delivering the message releases the
@@ -700,18 +708,14 @@ static enum si_sm_result smi_event_handl
if (si_sm_result == SI_SM_TRANSACTION_COMPLETE)
{
- spin_lock(&smi_info->count_lock);
- smi_info->complete_transactions++;
- spin_unlock(&smi_info->count_lock);
+ smi_inc_stat(smi_info, complete_transactions);
handle_transaction_done(smi_info);
si_sm_result = smi_info->handlers->event(smi_info->si_sm, 0);
}
else if (si_sm_result == SI_SM_HOSED)
{
- spin_lock(&smi_info->count_lock);
- smi_info->hosed_count++;
- spin_unlock(&smi_info->count_lock);
+ smi_inc_stat(smi_info, hosed_count);
/* Do the before return_hosed_msg, because that
releases the lock. */
@@ -733,9 +737,7 @@ static enum si_sm_result smi_event_handl
{
unsigned char msg[2];
- spin_lock(&smi_info->count_lock);
- smi_info->attentions++;
- spin_unlock(&smi_info->count_lock);
+ smi_inc_stat(smi_info, attentions);
/* Got a attn, send down a get message flags to see
what's causing it. It would be better to handle
@@ -753,9 +755,7 @@ static enum si_sm_result smi_event_handl
/* If we are currently idle, try to start the next message. */
if (si_sm_result == SI_SM_IDLE) {
- spin_lock(&smi_info->count_lock);
- smi_info->idles++;
- spin_unlock(&smi_info->count_lock);
+ smi_inc_stat(smi_info, idles);
si_sm_result = start_next_msg(smi_info);
if (si_sm_result != SI_SM_IDLE)
@@ -946,23 +946,17 @@ static void smi_timeout(unsigned long da
if ((smi_info->irq) && (!smi_info->interrupt_disabled)) {
/* Running with interrupts, only do long timeouts. */
smi_info->si_timer.expires = jiffies + SI_TIMEOUT_JIFFIES;
- spin_lock_irqsave(&smi_info->count_lock, flags);
- smi_info->long_timeouts++;
- spin_unlock_irqrestore(&smi_info->count_lock, flags);
+ smi_inc_stat(smi_info, long_timeouts);
goto do_add_timer;
}
/* If the state machine asks for a short delay, then shorten
the timer timeout. */
if (smi_result == SI_SM_CALL_WITH_DELAY) {
- spin_lock_irqsave(&smi_info->count_lock, flags);
- smi_info->short_timeouts++;
- spin_unlock_irqrestore(&smi_info->count_lock, flags);
+ smi_inc_stat(smi_info, short_timeouts);
smi_info->si_timer.expires = jiffies + 1;
} else {
- spin_lock_irqsave(&smi_info->count_lock, flags);
- smi_info->long_timeouts++;
- spin_unlock_irqrestore(&smi_info->count_lock, flags);
+ smi_inc_stat(smi_info, long_timeouts);
smi_info->si_timer.expires = jiffies + SI_TIMEOUT_JIFFIES;
}
@@ -980,9 +974,7 @@ static irqreturn_t si_irq_handler(int ir
spin_lock_irqsave(&(smi_info->si_lock), flags);
- spin_lock(&smi_info->count_lock);
- smi_info->interrupts++;
- spin_unlock(&smi_info->count_lock);
+ smi_inc_stat(smi_info, interrupts);
#ifdef DEBUG_TIMING
do_gettimeofday(&t);
@@ -1766,9 +1758,7 @@ static u32 ipmi_acpi_gpe(void *context)
spin_lock_irqsave(&(smi_info->si_lock), flags);
- spin_lock(&smi_info->count_lock);
- smi_info->interrupts++;
- spin_unlock(&smi_info->count_lock);
+ smi_inc_stat(smi_info, interrupts);
#ifdef DEBUG_TIMING
do_gettimeofday(&t);
@@ -2406,30 +2396,30 @@ static int stat_file_read_proc(char *pag
out += sprintf(out, "interrupts_enabled: %d\n",
smi->irq && !smi->interrupt_disabled);
- out += sprintf(out, "short_timeouts: %ld\n",
- smi->short_timeouts);
- out += sprintf(out, "long_timeouts: %ld\n",
- smi->long_timeouts);
- out += sprintf(out, "timeout_restarts: %ld\n",
- smi->timeout_restarts);
- out += sprintf(out, "idles: %ld\n",
- smi->idles);
- out += sprintf(out, "interrupts: %ld\n",
- smi->interrupts);
- out += sprintf(out, "attentions: %ld\n",
- smi->attentions);
- out += sprintf(out, "flag_fetches: %ld\n",
- smi->flag_fetches);
- out += sprintf(out, "hosed_count: %ld\n",
- smi->hosed_count);
- out += sprintf(out, "complete_transactions: %ld\n",
- smi->complete_transactions);
- out += sprintf(out, "events: %ld\n",
- smi->events);
- out += sprintf(out, "watchdog_pretimeouts: %ld\n",
- smi->watchdog_pretimeouts);
- out += sprintf(out, "incoming_messages: %ld\n",
- smi->incoming_messages);
+ out += sprintf(out, "short_timeouts: %u\n",
+ smi_get_stat(smi, short_timeouts));
+ out += sprintf(out, "long_timeouts: %u\n",
+ smi_get_stat(smi, long_timeouts));
+ out += sprintf(out, "timeout_restarts: %u\n",
+ smi_get_stat(smi, timeout_restarts));
+ out += sprintf(out, "idles: %u\n",
+ smi_get_stat(smi, idles));
+ out += sprintf(out, "interrupts: %u\n",
+ smi_get_stat(smi, interrupts));
+ out += sprintf(out, "attentions: %u\n",
+ smi_get_stat(smi, attentions));
+ out += sprintf(out, "flag_fetches: %u\n",
+ smi_get_stat(smi, flag_fetches));
+ out += sprintf(out, "hosed_count: %u\n",
+ smi_get_stat(smi, hosed_count));
+ out += sprintf(out, "complete_transactions: %u\n",
+ smi_get_stat(smi, complete_transactions));
+ out += sprintf(out, "events: %u\n",
+ smi_get_stat(smi, events));
+ out += sprintf(out, "watchdog_pretimeouts: %u\n",
+ smi_get_stat(smi, watchdog_pretimeouts));
+ out += sprintf(out, "incoming_messages: %u\n",
+ smi_get_stat(smi, incoming_messages));
return out - page;
}
@@ -2677,6 +2667,7 @@ static int is_new_interface(struct smi_i
static int try_smi_init(struct smi_info *new_smi)
{
int rv;
+ int i;
if (new_smi->addr_source) {
printk(KERN_INFO "ipmi_si: Trying %s-specified %s state"
@@ -2739,7 +2730,6 @@ static int try_smi_init(struct smi_info
spin_lock_init(&(new_smi->si_lock));
spin_lock_init(&(new_smi->msg_lock));
- spin_lock_init(&(new_smi->count_lock));
/* Do low-level detection first. */
if (new_smi->handlers->detect(new_smi->si_sm)) {
@@ -2768,6 +2758,8 @@ static int try_smi_init(struct smi_info
new_smi->curr_msg = NULL;
atomic_set(&new_smi->req_events, 0);
new_smi->run_to_completion = 0;
+ for (i = 0; i < SI_NUM_STATS; i++)
+ atomic_set(&new_smi->stats[i], 0);
new_smi->interrupt_disabled = 0;
atomic_set(&new_smi->stop_operation, 0);
--
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