mirror of
https://github.com/freebsd/freebsd-src
synced 2024-10-15 21:05:08 +00:00
Hide acpi_timer_test behind a tunable
When hw.acpi.timer_test_enabled is set to 0, this makes acpi_timer_test return 1 without actually testing the ACPI timer; this results in the ACPI-fast timecounter always being used rather than potentially using ACPI-safe. The ACPI timer testing was introduced in 2002 as a workaround for errata in Pentium II and Pentium III chipsets, and is unlikely to be needed in 2021. While I'm here, add TSENTER/TSEXIT to make it easier to see the time spent on the test (if it is enabled). Reviewed by: allanjude, imp MFC After: 1 week
This commit is contained in:
parent
19261079b7
commit
3c253d03d9
|
@ -79,6 +79,8 @@ static int acpi_timer_sysctl_freq(SYSCTL_HANDLER_ARGS);
|
|||
static void acpi_timer_boot_test(void);
|
||||
|
||||
static int acpi_timer_test(void);
|
||||
static int acpi_timer_test_enabled = 1;
|
||||
TUNABLE_INT("hw.acpi.timer_test_enabled", &acpi_timer_test_enabled);
|
||||
|
||||
static device_method_t acpi_timer_methods[] = {
|
||||
DEVMETHOD(device_identify, acpi_timer_identify),
|
||||
|
@ -404,6 +406,12 @@ acpi_timer_test()
|
|||
int delta, max, max2, min, n;
|
||||
register_t s;
|
||||
|
||||
/* Skip the test based on the hw.acpi.timer_test_enabled tunable. */
|
||||
if (!acpi_timer_test_enabled)
|
||||
return (1);
|
||||
|
||||
TSENTER();
|
||||
|
||||
min = INT32_MAX;
|
||||
max = max2 = 0;
|
||||
|
||||
|
@ -434,6 +442,8 @@ acpi_timer_test()
|
|||
if (bootverbose)
|
||||
printf(" %d/%d", n, delta);
|
||||
|
||||
TSEXIT();
|
||||
|
||||
return (n);
|
||||
}
|
||||
#undef N
|
||||
|
|
Loading…
Reference in a new issue