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Commit 6edc22fc authored by Finn Thain's avatar Finn Thain Committed by Michael Ellerman
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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: default avatarStan Johnson <userm57@yahoo.com>
Signed-off-by: default avatarFinn Thain <fthain@telegraphics.com.au>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent b5c7ccca

drivers/macintosh/via-pmu.c

+12 −8
Original line number Diff line number Diff line
@@ -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);