[Intel-gfx] [PATCH v2] Core-for-CI:ICL_only Disable ACPI idle driver

Peres, Martin martin.peres at intel.com
Wed Apr 10 08:50:39 UTC 2019


On 09/04/2019 18:49, Wysocki, Rafael J wrote:
> On 4/9/2019 8:29 AM, Anshuman Gupta wrote:
>> There were few system hung observed while running i915_pm_rpm igt test.
>> FDO https://bugs.freedesktop.org/show_bug.cgi?id=108840
>> Root cause is believed to due to page fault in ACPI idle driver.
>> (FDO comment 18).
>> It has been suggested by Daniel Vetter to disable ACPI idle
>> driver for Core-for-CI, only for ICL.
>>
>> This hacky patch is only for ICL processor and for Core-for-CI branch.
>>
>> v2: Fixed compilation errors raised by lkp.
>>      commit message improvement.
>>
>> Cc: martin.peres at intel.com
>> Cc: daniel.vetter at intel.com
>>
>> Signed-off-by: Anshuman Gupta <anshuman.gupta at intel.com>
> 
> This is fine only as long as it doesn't anywhere close to the mainline.
> 
> If ACPI idle crashes on new Intel HW, it needs to be fixed to work with 
> it instead of refusing to work on it.\

Yes, this is the point of topic/core-for-ci:
https://cgit.freedesktop.org/drm/drm-intel/log/?h=topic/core-for-CI

I'll need to unblock the execution of the shards by filing a bug for the
issue caught by BAT, and when we get a green FULL results, we'll be good
to merge.

Martin

> 
>> ---
>>   drivers/acpi/processor_driver.c | 18 +++++++++++++++++-
>>   1 file changed, 17 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c
>> index 9d6aff2..ee842a2f 100644
>> --- a/drivers/acpi/processor_driver.c
>> +++ b/drivers/acpi/processor_driver.c
>> @@ -35,6 +35,12 @@
>>   
>>   #include <acpi/processor.h>
>>   
>> +/* Only for Core-for-CI so don't want ia64 to fail compilation.*/
>> +#ifdef CONFIG_X86
>> +#include <asm/cpu_device_id.h>
>> +#include <asm/intel-family.h>
>> +#endif
>> +
>>   #include "internal.h"
>>   
>>   #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
>> @@ -58,6 +64,13 @@ static const struct acpi_device_id processor_device_ids[] = {
>>   };
>>   MODULE_DEVICE_TABLE(acpi, processor_device_ids);
>>   
>> +#define ICPU(model)	{ X86_VENDOR_INTEL, 6, model, X86_FEATURE_ANY, }
>> +static const struct x86_cpu_id intel_cpu_ids[] = {
>> +	ICPU(INTEL_FAM6_ICELAKE_MOBILE),	/* ICL */
>> +	{}
>> +};
>> +MODULE_DEVICE_TABLE(x86cpu, intel_cpu_ids);
>> +
>>   static struct device_driver acpi_processor_driver = {
>>   	.name = "processor",
>>   	.bus = &cpu_subsys,
>> @@ -226,6 +239,7 @@ static inline void acpi_pss_perf_exit(struct acpi_processor *pr,
>>   static int __acpi_processor_start(struct acpi_device *device)
>>   {
>>   	struct acpi_processor *pr = acpi_driver_data(device);
>> +	const struct x86_cpu_id *id;
>>   	acpi_status status;
>>   	int result = 0;
>>   
>> @@ -239,7 +253,9 @@ static int __acpi_processor_start(struct acpi_device *device)
>>   	if (result && !IS_ENABLED(CONFIG_ACPI_CPU_FREQ_PSS))
>>   		dev_dbg(&device->dev, "CPPC data invalid or not present\n");
>>   
>> -	if (!cpuidle_get_driver() || cpuidle_get_driver() == &acpi_idle_driver)
>> +	id = x86_match_cpu(intel_cpu_ids);
>> +	if (!id && (!cpuidle_get_driver() || cpuidle_get_driver() ==
>> +		&acpi_idle_driver))
>>   		acpi_processor_power_init(pr);
>>   
>>   	result = acpi_pss_perf_init(pr, device);
> 
> 
> 

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