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macintosh/via-pmu: Disambiguate interrupt statistics 

Some of the event counters are overloaded which makes it very
difficult to interpret their values.

Counter 0 is supposed to report CB1 interrupts but it can also count
PMU_INT_WAITING_CHARGER events.

Counter 1 is supposed to report GPIO interrupts but it can also count
other events (depending upon the value of the PMU_INT_ADB bit).

Disambiguate these statistics with dedicated counters for GPIO and
CB1 interrupts.

Comments in the MkLinux source code say that the type 0 and type 1
interrupts are model-specific. Label them as "unknown".

This change to the contents of /proc/pmu/interrupts is by necessity
visible in userland. However, packages which interact with the PMU
(that is, pbbuttonsd, pmac-utils and pmud) don't open this file.
AFAIK, user software has no need to poll these counters.

Tested-by: Stan Johnson <userm57@yahoo.com>
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Finn Thain 2018-07-02 04:21:19 -04:00 committed by Michael Ellerman
parent b5c7cccaac
commit 6edc22fc9c
1 changed files with 12 additions and 8 deletions
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20
drivers/macintosh/via-pmu.c
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@ -172,7 +172,9 @@ static int drop_interrupts;
static int option_lid_wakeup = 1;
#endif /* CONFIG_SUSPEND && CONFIG_PPC32 */
static unsigned long async_req_locks;
static unsigned int pmu_irq_stats[11];
#define NUM_IRQ_STATS 13
static unsigned int pmu_irq_stats[NUM_IRQ_STATS];
static struct proc_dir_entry *proc_pmu_root;
static struct proc_dir_entry *proc_pmu_info;
@ -873,9 +875,9 @@ static int pmu_info_proc_show(struct seq_file *m, void *v)
static int pmu_irqstats_proc_show(struct seq_file *m, void *v)
{
int i;
static const char *irq_names[] = {
"Total CB1 triggered events",
"Total GPIO1 triggered events",
static const char *irq_names[NUM_IRQ_STATS] = {
"Unknown interrupt (type 0)",
"Unknown interrupt (type 1)",
"PC-Card eject button",
"Sound/Brightness button",
"ADB message",
@ -884,10 +886,12 @@ static int pmu_irqstats_proc_show(struct seq_file *m, void *v)
"Tick timer",
"Ghost interrupt (zero len)",
"Empty interrupt (empty mask)",
"Max irqs in a row"
"Max irqs in a row",
"Total CB1 triggered events",
"Total GPIO1 triggered events",
};
for (i=0; i<11; i++) {
for (i = 0; i < NUM_IRQ_STATS; i++) {
seq_printf(m, " %2u: %10u (%s)\n",
i, pmu_irq_stats[i], irq_names[i]);
}
@ -1622,7 +1626,7 @@ via_pmu_interrupt(int irq, void *arg)
}
if (intr & CB1_INT) {
adb_int_pending = 1;
pmu_irq_stats[0]++;
pmu_irq_stats[11]++;
}
if (intr & SR_INT) {
req = pmu_sr_intr();
@ -1709,7 +1713,7 @@ gpio1_interrupt(int irq, void *arg)
disable_irq_nosync(gpio_irq);
gpio_irq_enabled = 0;
}
pmu_irq_stats[1]++;
pmu_irq_stats[12]++;
adb_int_pending = 1;
spin_unlock_irqrestore(&pmu_lock, flags);
via_pmu_interrupt(0, NULL);