[PATCH 9/9] tools/arch/x86: intel_sdsi: Add support for reading meter certificates

David E. Box
2022-11-01T19:11:18Z

Add option to read and decode On Demand meter certificates.

Link: https://github.com/intel/intel-sdsi/blob/master/meter-certificate.rst

Signed-off-by: David E. Box <david.e.box@linux.intel.com>
---
tools/arch/x86/intel_sdsi/intel_sdsi.c | 110 ++++++++++++++++++++++++-
1 file changed, 107 insertions(+), 3 deletions(-)

diff --git a/tools/arch/x86/intel_sdsi/intel_sdsi.c b/tools/arch/x86/intel_sdsi/intel_sdsi.c
index 0680eda78b1a..ebf076ee6ef8 100644
--- a/tools/arch/x86/intel_sdsi/intel_sdsi.c
+++ b/tools/arch/x86/intel_sdsi/intel_sdsi.c
@@ -39,8 +39,10 @@
#define GUID_V2 0xF210D9EF
#define REGISTERS_MIN_SIZE 72
#define STATE_CERT_MAX_SIZE 4096
+#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)
@@ -150,6 +152,21 @@ struct bundle_encoding {
uint32_t encoding_rsvd[7];
};

+struct meter_certificate {
+ uint32_t block_signature;
+ uint32_t counter_unit;
+ uint64_t ppin;
+ uint32_t bundle_length;
+ uint32_t reserved;
+ uint32_t mmrc_encoding;
+ uint32_t mmrc_counter;
+};
+
+struct bundle_encoding_counter {
+ uint32_t encoding;
+ uint32_t counter;
+};
+
struct sdsi_dev {
struct sdsi_regs regs;
struct state_certificate sc;
@@ -160,6 +177,7 @@ struct sdsi_dev {

enum command {
CMD_SOCKET_INFO,
+ CMD_METER_CERT,
CMD_STATE_CERT,
CMD_PROV_AKC,
CMD_PROV_CAP,
@@ -306,6 +324,86 @@ static void get_feature(uint32_t encoding, char *feature)
feature[0] = name[3];
}

+static int sdsi_meter_cert_show(struct sdsi_dev *s)
+{
+ char buf[METER_CERT_MAX_SIZE] = {0};
+ struct bundle_encoding_counter *bec;
+ struct meter_certificate *mc;
+ uint32_t count = 0;
+ FILE *cert_ptr;
+ int ret, size;
+
+ ret = sdsi_update_registers(s);
+ if (ret)
+ return ret;
+
+ if (!s->regs.en_features.sdsi) {
+ fprintf(stderr, "SDSi feature is present but not enabled.\n");
+ fprintf(stderr, " Unable to read meter certificate\n");
+ return -1;
+ }
+
+ if (!s->regs.en_features.metering) {
+ fprintf(stderr, "Metering not supporting on this socket.\n");
+ return -1;
+ }
+
+ ret = chdir(s->dev_path);
+ if (ret == -1) {
+ perror("chdir");
+ return ret;
+ }
+
+ cert_ptr = fopen("meter_certificate", "r");
+ if (!cert_ptr) {
+ perror("Could not open 'meter_certificate' file");
+ return -1;
+ }
+
+ size = fread(buf, 1, sizeof(buf), cert_ptr);
+ if (!size) {
+ fprintf(stderr, "Could not read 'meter_certificate' file\n");
+ fclose(cert_ptr);
+ return -1;
+ }
+ fclose(cert_ptr);
+
+ mc = (struct meter_certificate *)buf;
+
+ 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);
+ 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 the %d bundles: %d\n",
+ METER_MAX_NUM_BUNDLES, mc->bundle_length / 8);
+ return -1;
+ }
+
+ 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];
+
+ feature[4] = '\0';
+ get_feature(bec[count].encoding, feature);
+ printf(" %s: %d\n", feature, bec[count].counter);
+ }
+
+ return 0;
+}
+
static int sdsi_state_cert_show(struct sdsi_dev *s)
{
char buf[STATE_CERT_MAX_SIZE] = {0};
@@ -625,7 +723,7 @@ static void sdsi_free_dev(struct sdsi_dev *s)

static void usage(char *prog)
{
- printf("Usage: %s [-l] [-d DEVNO [-i] [-s] [-a FILE] [-c FILE]]\n", prog);
+ printf("Usage: %s [-l] [-d DEVNO [-i] [-s] [-m] [-a FILE] [-c FILE]]\n", prog);
}

static void show_help(void)
@@ -635,6 +733,7 @@ static void show_help(void)
printf(" %-18s\t%s\n", "-d, --devno DEVNO", "On Demand device number");
printf(" %-18s\t%s\n", "-i, --info", "show socket information");
printf(" %-18s\t%s\n", "-s, --state", "show state certificate");
+ printf(" %-18s\t%s\n", "-m, --meter", "show meter certificate");
printf(" %-18s\t%s\n", "-a, --akc FILE", "provision socket with AKC FILE");
printf(" %-18s\t%s\n", "-c, --cap FILE>", "provision socket with CAP FILE");
}
@@ -656,6 +755,7 @@ int main(int argc, char *argv[])
{"help", no_argument, 0, 'h'},
{"info", no_argument, 0, 'i'},
{"list", no_argument, 0, 'l'},
+ {"meter", no_argument, 0, 'm'},
{"state", no_argument, 0, 's'},
{0, 0, 0, 0 }
};
@@ -663,7 +763,7 @@ int main(int argc, char *argv[])

progname = argv[0];

- while ((opt = getopt_long_only(argc, argv, "+a:c:d:hils", long_options,
+ while ((opt = getopt_long_only(argc, argv, "+a:c:d:hilms", long_options,
&option_index)) != -1) {
switch (opt) {
case 'd':
@@ -676,8 +776,9 @@ int main(int argc, char *argv[])
case 'i':
command = CMD_SOCKET_INFO;
break;
+ case 'm':
case 's':
- command = CMD_STATE_CERT;
+ command = (opt == 'm') ? CMD_METER_CERT : CMD_STATE_CERT;
break;
case 'a':
case 'c':
@@ -713,6 +814,9 @@ int main(int argc, char *argv[])
case CMD_SOCKET_INFO:
ret = sdsi_read_reg(s);
break;
+ case CMD_METER_CERT:
+ ret = sdsi_meter_cert_show(s);
+ break;
case CMD_STATE_CERT:
ret = sdsi_state_cert_show(s);
break;
--
2.25.1