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This is a new release of the IPMI driver that fixes some
performance problems. Some vendors implement firmware
updates over IPMI, and this speeds up that process quite
a bit.
Linus, please apply.
Alan, I will send you the 2.4 patch, so you don't have to fetch
it from SF.
This release:
* Improves the "send - wait for response - send -wait for
response - etc" performance when using high-res timers.
Before, an ~10ms delay would be added to each message,
because it didn't restart the timer if nothing was happing
when a new message was started.
* Adds some checking for leaked messages.
The patch is a 2.5 version against what is current in Bitkeeper (well,
what is current in bk-CVS, thanks for the tool, Larry). The 2.5.66
and 2.4.20 versions are at:
http://sourceforge.net/projects/openipmi/
-Corey
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name="linux-2.5.67-pre-ipmi-diff"
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filename="linux-2.5.67-pre-ipmi-diff"
Only in linux-2.5/drivers/char/ipmi: CVS
diff -ur linux-2.5/drivers/char/ipmi/ipmi_kcs_intf.c /home/minyard/2.5.66/linux-main/drivers/char/ipmi/ipmi_kcs_intf.c
--- linux-2.5/drivers/char/ipmi/ipmi_kcs_intf.c Thu Mar 27 23:14:18 2003
+++ /home/minyard/2.5.66/linux-main/drivers/char/ipmi/ipmi_kcs_intf.c Thu Apr 3 08:46:26 2003
@@ -61,6 +61,14 @@
/* Measure times between events in the driver. */
#undef DEBUG_TIMING
+/* Timing parameters. Call every 10 ms when not doing anything,
+ otherwise call every KCS_SHORT_TIMEOUT_USEC microseconds. */
+#define KCS_TIMEOUT_TIME_USEC 10000
+#define KCS_USEC_PER_JIFFY (1000000/HZ)
+#define KCS_TIMEOUT_JIFFIES (KCS_TIMEOUT_TIME_USEC/KCS_USEC_PER_JIFFY)
+#define KCS_SHORT_TIMEOUT_USEC 250 /* .25ms when the SM request a
+ short timeout */
+
#ifdef CONFIG_IPMI_KCS
/* This forces a dependency to the config file for this option. */
#endif
@@ -132,6 +140,8 @@
int interrupt_disabled;
};
+static void kcs_restart_short_timer(struct kcs_info *kcs_info);
+
static void deliver_recv_msg(struct kcs_info *kcs_info, struct ipmi_smi_msg *msg)
{
/* Deliver the message to the upper layer with the lock
@@ -309,6 +319,9 @@
#endif
switch (kcs_info->kcs_state) {
case KCS_NORMAL:
+ if (!kcs_info->curr_msg)
+ break;
+
kcs_info->curr_msg->rsp_size
= kcs_get_result(kcs_info->kcs_sm,
kcs_info->curr_msg->rsp,
@@ -563,8 +576,9 @@
spin_lock_irqsave(&(kcs_info->kcs_lock), flags);
result = kcs_event_handler(kcs_info, 0);
while (result != KCS_SM_IDLE) {
- udelay(500);
- result = kcs_event_handler(kcs_info, 500);
+ udelay(KCS_SHORT_TIMEOUT_USEC);
+ result = kcs_event_handler(kcs_info,
+ KCS_SHORT_TIMEOUT_USEC);
}
spin_unlock_irqrestore(&(kcs_info->kcs_lock), flags);
return;
@@ -582,6 +596,7 @@
&& (kcs_info->curr_msg == NULL))
{
start_next_msg(kcs_info);
+ kcs_restart_short_timer(kcs_info);
}
spin_unlock_irqrestore(&(kcs_info->kcs_lock), flags);
}
@@ -598,8 +613,9 @@
if (i_run_to_completion) {
result = kcs_event_handler(kcs_info, 0);
while (result != KCS_SM_IDLE) {
- udelay(500);
- result = kcs_event_handler(kcs_info, 500);
+ udelay(KCS_SHORT_TIMEOUT_USEC);
+ result = kcs_event_handler(kcs_info,
+ KCS_SHORT_TIMEOUT_USEC);
}
}
@@ -613,14 +629,42 @@
atomic_set(&kcs_info->req_events, 1);
}
-/* Call every 10 ms. */
-#define KCS_TIMEOUT_TIME_USEC 10000
-#define KCS_USEC_PER_JIFFY (1000000/HZ)
-#define KCS_TIMEOUT_JIFFIES (KCS_TIMEOUT_TIME_USEC/KCS_USEC_PER_JIFFY)
-#define KCS_SHORT_TIMEOUT_USEC 500 /* .5ms when the SM request a
- short timeout */
static int initialized = 0;
+/* Must be called with interrupts off and with the kcs_lock held. */
+static void kcs_restart_short_timer(struct kcs_info *kcs_info)
+{
+ if (del_timer(&(kcs_info->kcs_timer))) {
+#ifdef CONFIG_HIGH_RES_TIMERS
+ unsigned long jiffies_now;
+
+ /* If we don't delete the timer, then it will go off
+ immediately, anyway. So we only process if we
+ actually delete the timer. */
+
+ /* We already have irqsave on, so no need for it
+ here. */
+ read_lock(&xtime_lock);
+ jiffies_now = jiffies;
+ kcs_info->kcs_timer.expires = jiffies_now;
+
+ kcs_info->kcs_timer.sub_expires
+ = quick_update_jiffies_sub(jiffies_now);
+ read_unlock(&xtime_lock);
+
+ kcs_info->kcs_timer.sub_expires
+ += usec_to_arch_cycles(KCS_SHORT_TIMEOUT_USEC);
+ while (kcs_info->kcs_timer.sub_expires >= cycles_per_jiffies) {
+ kcs_info->kcs_timer.expires++;
+ kcs_info->kcs_timer.sub_expires -= cycles_per_jiffies;
+ }
+#else
+ kcs_info->kcs_timer.expires = jiffies + 1;
+#endif
+ add_timer(&(kcs_info->kcs_timer));
+ }
+}
+
static void kcs_timeout(unsigned long data)
{
struct kcs_info *kcs_info = (struct kcs_info *) data;
@@ -643,12 +687,11 @@
printk("**Timer: %d.%9.9d\n", t.tv_sec, t.tv_usec);
#endif
jiffies_now = jiffies;
+
time_diff = ((jiffies_now - kcs_info->last_timeout_jiffies)
* KCS_USEC_PER_JIFFY);
kcs_result = kcs_event_handler(kcs_info, time_diff);
- spin_unlock_irqrestore(&(kcs_info->kcs_lock), flags);
-
kcs_info->last_timeout_jiffies = jiffies_now;
if ((kcs_info->irq) && (! kcs_info->interrupt_disabled)) {
@@ -669,6 +712,7 @@
}
} else {
kcs_info->kcs_timer.expires = jiffies + KCS_TIMEOUT_JIFFIES;
+ kcs_info->kcs_timer.sub_expires = 0;
}
#else
/* If requested, take the shortest delay possible */
@@ -681,6 +725,7 @@
do_add_timer:
add_timer(&(kcs_info->kcs_timer));
+ spin_unlock_irqrestore(&(kcs_info->kcs_lock), flags);
}
static void kcs_irq_handler(int irq, void *data, struct pt_regs *regs)
diff -ur linux-2.5/drivers/char/ipmi/ipmi_msghandler.c /home/minyard/2.5.66/linux-main/drivers/char/ipmi/ipmi_msghandler.c
--- linux-2.5/drivers/char/ipmi/ipmi_msghandler.c Fri Feb 21 15:44:13 2003
+++ /home/minyard/2.5.66/linux-main/drivers/char/ipmi/ipmi_msghandler.c Thu Apr 3 07:58:06 2003
@@ -1765,9 +1765,13 @@
}
+static atomic_t smi_msg_inuse_count = ATOMIC_INIT(0);
+static atomic_t recv_msg_inuse_count = ATOMIC_INIT(0);
+
/* FIXME - convert these to slabs. */
static void free_smi_msg(struct ipmi_smi_msg *msg)
{
+ atomic_dec(&smi_msg_inuse_count);
kfree(msg);
}
@@ -1775,13 +1779,16 @@
{
struct ipmi_smi_msg *rv;
rv = kmalloc(sizeof(struct ipmi_smi_msg), GFP_ATOMIC);
- if (rv)
+ if (rv) {
rv->done = free_smi_msg;
+ atomic_inc(&smi_msg_inuse_count);
+ }
return rv;
}
static void free_recv_msg(struct ipmi_recv_msg *msg)
{
+ atomic_dec(&recv_msg_inuse_count);
kfree(msg);
}
@@ -1790,8 +1797,10 @@
struct ipmi_recv_msg *rv;
rv = kmalloc(sizeof(struct ipmi_recv_msg), GFP_ATOMIC);
- if (rv)
+ if (rv) {
rv->done = free_recv_msg;
+ atomic_inc(&recv_msg_inuse_count);
+ }
return rv;
}
@@ -1924,6 +1933,8 @@
static __exit void cleanup_ipmi(void)
{
+ int count;
+
if (!initialized)
return;
@@ -1940,6 +1951,16 @@
}
initialized = 0;
+
+ /* Check for buffer leaks. */
+ count = atomic_read(&smi_msg_inuse_count);
+ if (count != 0)
+ printk("ipmi_msghandler: SMI message count %d at exit\n",
+ count);
+ count = atomic_read(&recv_msg_inuse_count);
+ if (count != 0)
+ printk("ipmi_msghandler: recv message count %d at exit\n",
+ count);
}
module_exit(cleanup_ipmi);
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