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Commit 9d58bec0 authored by Pali Rohár's avatar Pali Rohár Committed by Guenter Roeck
Browse files

hwmon: (dell-smm) In debug mode log duration of SMM calls 



This allow us to debug how long take each SMM call and how long is system
frozen in SMM handler.

Signed-off-by: default avatarPali Rohár <pali.rohar@gmail.com>
Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
parent 747bc8b0

drivers/hwmon/dell-smm-hwmon.c

+17 −0
Original line number Diff line number Diff line
@@ -140,6 +140,14 @@ static int i8k_smm(struct smm_regs *regs) 
	int eax = regs->eax;

	cpumask_var_t old_mask;



#ifdef DEBUG

	int ebx = regs->ebx;

	unsigned long duration;

	ktime_t calltime, delta, rettime;



	calltime = ktime_get();

#endif



	/* SMM requires CPU 0 */

	if (!alloc_cpumask_var(&old_mask, GFP_KERNEL))

		return -ENOMEM;
@@ -211,6 +219,15 @@ static int i8k_smm(struct smm_regs *regs) 
out:

	set_cpus_allowed_ptr(current, old_mask);

	free_cpumask_var(old_mask);



#ifdef DEBUG

	rettime = ktime_get();

	delta = ktime_sub(rettime, calltime);

	duration = ktime_to_ns(delta) >> 10;

	pr_debug("smm(0x%.4x 0x%.4x) = 0x%.4x  (took %7lu usecs)\n", eax, ebx,

		(rc ? 0xffff : regs->eax & 0xffff), duration);

#endif



	return rc;

}