lkml.org 
[lkml]   [2018]   [Feb]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: [PATCH 1/2] ACPI: processor_perflib: Do not send _PPC change notification if not ready
Date
On Monday, January 29, 2018 3:26:46 AM CET Yu Chen wrote:
> The following warning was triggered after resumed from S3 -
> if all the nonboot CPUs were put offline before suspend:
>
> [ 1840.329515] unchecked MSR access error: RDMSR from 0x771 at rIP: 0xffffffff86061e3a (native_read_msr+0xa/0x30)
> [ 1840.329516] Call Trace:
> [ 1840.329521] __rdmsr_on_cpu+0x33/0x50
> [ 1840.329525] generic_exec_single+0x81/0xb0
> [ 1840.329527] smp_call_function_single+0xd2/0x100
> [ 1840.329530] ? acpi_ds_result_pop+0xdd/0xf2
> [ 1840.329532] ? acpi_ds_create_operand+0x215/0x23c
> [ 1840.329534] rdmsrl_on_cpu+0x57/0x80
> [ 1840.329536] ? cpumask_next+0x1b/0x20
> [ 1840.329538] ? rdmsrl_on_cpu+0x57/0x80
> [ 1840.329541] intel_pstate_update_perf_limits+0xf3/0x220
> [ 1840.329544] ? notifier_call_chain+0x4a/0x70
> [ 1840.329546] intel_pstate_set_policy+0x4e/0x150
> [ 1840.329548] cpufreq_set_policy+0xcd/0x2f0
> [ 1840.329550] cpufreq_update_policy+0xb2/0x130
> [ 1840.329552] ? cpufreq_update_policy+0x130/0x130
> [ 1840.329556] acpi_processor_ppc_has_changed+0x65/0x80
> [ 1840.329558] acpi_processor_notify+0x80/0x100
> [ 1840.329561] acpi_ev_notify_dispatch+0x44/0x5c
> [ 1840.329563] acpi_os_execute_deferred+0x14/0x20
> [ 1840.329565] process_one_work+0x193/0x3c0
> [ 1840.329567] worker_thread+0x35/0x3b0
> [ 1840.329569] kthread+0x125/0x140
> [ 1840.329571] ? process_one_work+0x3c0/0x3c0
> [ 1840.329572] ? kthread_park+0x60/0x60
> [ 1840.329575] ? do_syscall_64+0x67/0x180
> [ 1840.329577] ret_from_fork+0x25/0x30
> [ 1840.329585] unchecked MSR access error: WRMSR to 0x774 (tried to write 0x0000000000000000) at rIP: 0xffffffff86061f78 (native_write_msr+0x8/0x30)
> [ 1840.329586] Call Trace:
> [ 1840.329587] __wrmsr_on_cpu+0x37/0x40
> [ 1840.329589] generic_exec_single+0x81/0xb0
> [ 1840.329592] smp_call_function_single+0xd2/0x100
> [ 1840.329594] ? acpi_ds_create_operand+0x215/0x23c
> [ 1840.329595] ? cpumask_next+0x1b/0x20
> [ 1840.329597] wrmsrl_on_cpu+0x57/0x70
> [ 1840.329598] ? rdmsrl_on_cpu+0x57/0x80
> [ 1840.329599] ? wrmsrl_on_cpu+0x57/0x70
> [ 1840.329602] intel_pstate_hwp_set+0xd3/0x150
> [ 1840.329604] intel_pstate_set_policy+0x119/0x150
> [ 1840.329606] cpufreq_set_policy+0xcd/0x2f0
> [ 1840.329607] cpufreq_update_policy+0xb2/0x130
> [ 1840.329610] ? cpufreq_update_policy+0x130/0x130
> [ 1840.329613] acpi_processor_ppc_has_changed+0x65/0x80
> [ 1840.329615] acpi_processor_notify+0x80/0x100
> [ 1840.329617] acpi_ev_notify_dispatch+0x44/0x5c
> [ 1840.329619] acpi_os_execute_deferred+0x14/0x20
> [ 1840.329620] process_one_work+0x193/0x3c0
> [ 1840.329622] worker_thread+0x35/0x3b0
> [ 1840.329624] kthread+0x125/0x140
> [ 1840.329625] ? process_one_work+0x3c0/0x3c0
> [ 1840.329626] ? kthread_park+0x60/0x60
> [ 1840.329628] ? do_syscall_64+0x67/0x180
> [ 1840.329631] ret_from_fork+0x25/0x30
>
> This is because if there's only one online CPU, the MSR_PM_ENABLE
> (package wide)can not be enabled after resumed, due to
> intel_pstate_hwp_enable() will only be invoked on AP's online
> process after resumed - if there's no AP online, the HWP remains
> disabled after resumed (BIOS has disabled it in S3). Then if
> there comes a _PPC change notification which touches HWP register
> during this stage, the warning is triggered.
>
> Since we don't call acpi_processor_register_performance() when
> HWP is enabled, the pr->performance will be NULL. When this is
> NULL we don't need to do _PPC change notification.
>
> Reported-by: Doug Smythies <dsmythies@telus.net>
> Suggested-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
> Signed-off-by: Yu Chen <yu.c.chen@intel.com>
> ---
> drivers/acpi/processor_perflib.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/acpi/processor_perflib.c b/drivers/acpi/processor_perflib.c
> index 18b72eec3507..c7cf48ad5cb9 100644
> --- a/drivers/acpi/processor_perflib.c
> +++ b/drivers/acpi/processor_perflib.c
> @@ -159,7 +159,7 @@ void acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag)
> {
> int ret;
>
> - if (ignore_ppc) {
> + if (ignore_ppc || !pr->performance) {
> /*
> * Only when it is notification event, the _OST object
> * will be evaluated. Otherwise it is skipped.
>

Applied, thanks!


\
 
 \ /
  Last update: 2018-02-08 11:01    [W:0.034 / U:21.236 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site