Re: [PATCH v3 9/9] platform/x86/intel/ifs: ARRAY BIST for Sierra Forest

[Ilpo Järvinen]

On Fri, 29 Sep 2023, Jithu Joseph wrote:

> Array BIST MSR addresses, bit definition and semantics are different for
> Sierra Forest. Branch into a separate Array BIST flow on Sierra Forest
> when user invokes Array Test.
> 
> Signed-off-by: Jithu Joseph <jithu.joseph@xxxxxxxxx>
> Reviewed-by: Tony Luck <tony.luck@xxxxxxxxx>
> Tested-by: Pengfei Xu <pengfei.xu@xxxxxxxxx>
> ---
>  drivers/platform/x86/intel/ifs/ifs.h     |  4 +++
>  drivers/platform/x86/intel/ifs/core.c    | 15 +++++-----
>  drivers/platform/x86/intel/ifs/runtest.c | 37 +++++++++++++++++++++++-
>  3 files changed, 48 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/platform/x86/intel/ifs/ifs.h b/drivers/platform/x86/intel/ifs/ifs.h
> index f0dd849b3400..b183aba3ffdf 100644
> --- a/drivers/platform/x86/intel/ifs/ifs.h
> +++ b/drivers/platform/x86/intel/ifs/ifs.h
> @@ -137,6 +137,8 @@
>  #define MSR_CHUNKS_AUTHENTICATION_STATUS	0x000002c5
>  #define MSR_ACTIVATE_SCAN			0x000002c6
>  #define MSR_SCAN_STATUS				0x000002c7
> +#define MSR_ARRAY_TRIGGER			0x000002d6
> +#define MSR_ARRAY_STATUS			0x000002d7
>  #define MSR_SAF_CTRL				0x000004f0
>  
>  #define SCAN_NOT_TESTED				0
> @@ -272,6 +274,7 @@ struct ifs_test_caps {
>   * @cur_batch: number indicating the currently loaded test file
>   * @generation: IFS test generation enumerated by hardware
>   * @chunk_size: size of a test chunk
> + * @array_gen: test generation of array test
>   */
>  struct ifs_data {
>  	int	loaded_version;
> @@ -283,6 +286,7 @@ struct ifs_data {
>  	u32	cur_batch;
>  	u32	generation;
>  	u32	chunk_size;
> +	u32	array_gen;
>  };
>  
>  struct ifs_work {
> diff --git a/drivers/platform/x86/intel/ifs/core.c b/drivers/platform/x86/intel/ifs/core.c
> index 0c8927916373..934eaf348f9d 100644
> --- a/drivers/platform/x86/intel/ifs/core.c
> +++ b/drivers/platform/x86/intel/ifs/core.c
> @@ -11,16 +11,16 @@
>  
>  #include "ifs.h"
>  
> -#define X86_MATCH(model)				\
> +#define X86_MATCH(model, array_gen)				\
>  	X86_MATCH_VENDOR_FAM_MODEL_FEATURE(INTEL, 6,	\
> -		INTEL_FAM6_##model, X86_FEATURE_CORE_CAPABILITIES, NULL)
> +		INTEL_FAM6_##model, X86_FEATURE_CORE_CAPABILITIES, array_gen)
>  
>  static const struct x86_cpu_id ifs_cpu_ids[] __initconst = {
> -	X86_MATCH(SAPPHIRERAPIDS_X),
> -	X86_MATCH(EMERALDRAPIDS_X),
> -	X86_MATCH(GRANITERAPIDS_X),
> -	X86_MATCH(GRANITERAPIDS_D),
> -	X86_MATCH(ATOM_CRESTMONT_X),
> +	X86_MATCH(SAPPHIRERAPIDS_X, 0),
> +	X86_MATCH(EMERALDRAPIDS_X, 0),
> +	X86_MATCH(GRANITERAPIDS_X, 0),
> +	X86_MATCH(GRANITERAPIDS_D, 0),
> +	X86_MATCH(ATOM_CRESTMONT_X, 1),

Just a suggestion that would IMO make these easier to understand, you 
could name these array generations with defines so that one does not need 
to look what's defined in X86_MATCH() to understand the purpose of the 
second parameter. But it's up to you.

-- 
 i.

>  	{}
>  };
>  MODULE_DEVICE_TABLE(x86cpu, ifs_cpu_ids);
> @@ -100,6 +100,7 @@ static int __init ifs_init(void)
>  			continue;
>  		ifs_devices[i].rw_data.generation = FIELD_GET(MSR_INTEGRITY_CAPS_SAF_GEN_MASK,
>  							      msrval);
> +		ifs_devices[i].rw_data.array_gen = (u32)m->driver_data;
>  		ret = misc_register(&ifs_devices[i].misc);
>  		if (ret)
>  			goto err_exit;
> diff --git a/drivers/platform/x86/intel/ifs/runtest.c b/drivers/platform/x86/intel/ifs/runtest.c
> index 4fe544d79946..a54cd97920c4 100644
> --- a/drivers/platform/x86/intel/ifs/runtest.c
> +++ b/drivers/platform/x86/intel/ifs/runtest.c
> @@ -329,6 +329,38 @@ static void ifs_array_test_core(int cpu, struct device *dev)
>  		ifsd->status = SCAN_TEST_PASS;
>  }
>  
> +#define ARRAY_GEN1_TEST_ALL_ARRAYS	0x0ULL
> +#define ARRAY_GEN1_STATUS_FAIL		0x1ULL
> +
> +static int do_array_test_gen1(void *status)
> +{
> +	int cpu = smp_processor_id();
> +	int first;
> +
> +	first = cpumask_first(cpu_smt_mask(cpu));
> +
> +	if (cpu == first) {
> +		wrmsrl(MSR_ARRAY_TRIGGER, ARRAY_GEN1_TEST_ALL_ARRAYS);
> +		rdmsrl(MSR_ARRAY_STATUS, *((u64 *)status));
> +	}
> +
> +	return 0;
> +}
> +
> +static void ifs_array_test_gen1(int cpu, struct device *dev)
> +{
> +	struct ifs_data *ifsd = ifs_get_data(dev);
> +	u64 status = 0;
> +
> +	stop_core_cpuslocked(cpu, do_array_test_gen1, &status);
> +	ifsd->scan_details = status;
> +
> +	if (status & ARRAY_GEN1_STATUS_FAIL)
> +		ifsd->status = SCAN_TEST_FAIL;
> +	else
> +		ifsd->status = SCAN_TEST_PASS;
> +}
> +
>  /*
>   * Initiate per core test. It wakes up work queue threads on the target cpu and
>   * its sibling cpu. Once all sibling threads wake up, the scan test gets executed and
> @@ -356,7 +388,10 @@ int do_core_test(int cpu, struct device *dev)
>  		ifs_test_core(cpu, dev);
>  		break;
>  	case IFS_TYPE_ARRAY_BIST:
> -		ifs_array_test_core(cpu, dev);
> +		if (ifsd->array_gen == 0)
> +			ifs_array_test_core(cpu, dev);
> +		else
> +			ifs_array_test_gen1(cpu, dev);
>  		break;
>  	default:
>  		return -EINVAL;
>