Re: [PATCH 7/8] tools: Fix errors in meter_certificate display

[Ilpo Järvinen]

On Wed, 31 Jan 2024, David E. Box wrote:

> The maximum number of bundles in the meter certificate was hardcoded to
> 8 which caused extra bundles not to display. Instead, since the bundles
> appear at the end of the file, set it to the remaining size from where
> the bundles start.
> 
> Add missing 'version' field to struct meter_certificate.
> 
> Fix errors in the calculation of the start position of the counters and
> in the display loop.

Why are all these bundled into a single commit? They sound like 
independent changes.

-- 
 i.

> Fixes: aad129780bae ("platform/x86/intel/sdsi: Add support for reading the current meter state")
> Signed-off-by: David E. Box <david.e.box@xxxxxxxxxxxxxxx>
> ---
>  tools/arch/x86/intel_sdsi/intel_sdsi.c | 51 +++++++++++++++-----------
>  1 file changed, 30 insertions(+), 21 deletions(-)
> 
> diff --git a/tools/arch/x86/intel_sdsi/intel_sdsi.c b/tools/arch/x86/intel_sdsi/intel_sdsi.c
> index 2cd92761f171..a8fb6d17405f 100644
> --- a/tools/arch/x86/intel_sdsi/intel_sdsi.c
> +++ b/tools/arch/x86/intel_sdsi/intel_sdsi.c
> @@ -43,7 +43,6 @@
>  #define METER_CERT_MAX_SIZE	4096
>  #define STATE_MAX_NUM_LICENSES	16
>  #define STATE_MAX_NUM_IN_BUNDLE	(uint32_t)8
> -#define METER_MAX_NUM_BUNDLES	8
>  
>  #define __round_mask(x, y) ((__typeof__(x))((y) - 1))
>  #define round_up(x, y) ((((x) - 1) | __round_mask(x, y)) + 1)
> @@ -154,11 +153,12 @@ struct bundle_encoding {
>  };
>  
>  struct meter_certificate {
> -	uint32_t block_signature;
> +	uint32_t signature;
> +	uint32_t version;
> +	uint64_t ppin;
>  	uint32_t counter_unit;
> -	uint64_t ppin;
>  	uint32_t bundle_length;
> -	uint32_t reserved;
> +	uint64_t reserved;
>  	uint32_t mmrc_encoding;
>  	uint32_t mmrc_counter;
>  };
> @@ -167,6 +167,9 @@ struct bundle_encoding_counter {
>  	uint32_t encoding;
>  	uint32_t counter;
>  };
> +#define METER_MAX_NUM_BUNDLES							\
> +		(METER_CERT_MAX_SIZE - sizeof(struct meter_certificate) /	\
> +		 sizeof(struct bundle_encoding_counter))
>  
>  struct sdsi_dev {
>  	struct sdsi_regs regs;
> @@ -334,6 +337,7 @@ static int sdsi_meter_cert_show(struct sdsi_dev *s)
>  	uint32_t count = 0;
>  	FILE *cert_ptr;
>  	int ret, size;
> +	char name[4];
>  
>  	ret = sdsi_update_registers(s);
>  	if (ret)
> @@ -375,32 +379,39 @@ static int sdsi_meter_cert_show(struct sdsi_dev *s)
>  	printf("\n");
>  	printf("Meter certificate for device %s\n", s->dev_name);
>  	printf("\n");
> -	printf("Block Signature:       0x%x\n", mc->block_signature);
> -	printf("Count Unit:            %dms\n", mc->counter_unit);
> -	printf("PPIN:                  0x%lx\n", mc->ppin);
> -	printf("Feature Bundle Length: %d\n", mc->bundle_length);
> -	printf("MMRC encoding:         %d\n", mc->mmrc_encoding);
> -	printf("MMRC counter:          %d\n", mc->mmrc_counter);
> +
> +	get_feature(mc->signature, name);
> +	printf("Signature:                    %.4s\n", name);
> +
> +	printf("Version:                      %d\n", mc->version);
> +	printf("Count Unit:                   %dms\n", mc->counter_unit);
> +	printf("PPIN:                         0x%lx\n", mc->ppin);
> +	printf("Feature Bundle Length:        %d\n", mc->bundle_length);
> +
> +	get_feature(mc->mmrc_encoding, name);
> +	printf("MMRC encoding:                %.4s\n", name);
> +
> +	printf("MMRC counter:                 %d\n", mc->mmrc_counter);
>  	if (mc->bundle_length % 8) {
>  		fprintf(stderr, "Invalid bundle length\n");
>  		return -1;
>  	}
>  
>  	if (mc->bundle_length > METER_MAX_NUM_BUNDLES * 8)  {
> -		fprintf(stderr, "More than %d bundles: %d\n",
> +		fprintf(stderr, "More than %ld bundles: actual %d\n",
>  			METER_MAX_NUM_BUNDLES, mc->bundle_length / 8);
>  		return -1;
>  	}
>  
> -	bec = (void *)(mc) + sizeof(mc);
> +	bec = (void *)(mc) + sizeof(*mc);
>  
> -	printf("Number of Feature Counters:          %d\n", mc->bundle_length / 8);
> -	while (count++ < mc->bundle_length / 8) {
> -		char feature[5];
> +	printf("Number of Feature Counters:   %d\n", mc->bundle_length / 8);
> +	while (count < mc->bundle_length / 8) {
> +		char feature[4];
>  
> -		feature[4] = '\0';
>  		get_feature(bec[count].encoding, feature);
> -		printf("    %s:          %d\n", feature, bec[count].counter);
> +		printf("    %.4s:          %d\n", feature, bec[count].counter);
> +		++count;
>  	}
>  
>  	return 0;
> @@ -480,7 +491,7 @@ static int sdsi_state_cert_show(struct sdsi_dev *s)
>  			sizeof(*lki) +			// size of the license key info
>  			offset;				// offset to this blob content
>  		struct bundle_encoding *bundle = (void *)(lbc) + sizeof(*lbc);
> -		char feature[5];
> +		char feature[4];
>  		uint32_t i;
>  
>  		printf("     Blob %d:\n", count - 1);
> @@ -493,11 +504,9 @@ static int sdsi_state_cert_show(struct sdsi_dev *s)
>  		printf("        Blob revision ID:           %u\n", lbc->rev_id);
>  		printf("        Number of Features:         %u\n", lbc->num_bundles);
>  
> -		feature[4] = '\0';
> -
>  		for (i = 0; i < min(lbc->num_bundles, STATE_MAX_NUM_IN_BUNDLE); i++) {
>  			get_feature(bundle[i].encoding, feature);
> -			printf("                 Feature %d:         %s\n", i, feature);
> +			printf("                 Feature %d:         %.4s\n", i, feature);
>  		}
>  
>  		if (lbc->num_bundles > STATE_MAX_NUM_IN_BUNDLE)
>