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[v2,09/11] tpm: Simplify tcg2_log_init()

Message ID 20241224160118.675977-10-raymond.mao@linaro.org
State New
Headers show
Series [v2,01/11] efi_loader: Don't warn if the TCG2 FinalEvents table is not installed | expand

Commit Message

Raymond Mao Dec. 24, 2024, 4:01 p.m. UTC 
From: Ilias Apalodimas <ilias.apalodimas@linaro.org>

A previous patch is storing the active PCR banks on the TPM private
data. Instead of parsing them on the fly use the stored values.
This allows us to simplify our checks during the log creation and
parsing.

Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Signed-off-by: Raymond Mao <raymond.mao@linaro.org>
---
Changes in v2
- None.

 lib/tpm_tcg2.c | 42 +++++++-----------------------------------
 1 file changed, 7 insertions(+), 35 deletions(-)
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Patch

diff --git a/lib/tpm_tcg2.c b/lib/tpm_tcg2.c
index 9e63204f24..6c72688b80 100644
--- a/lib/tpm_tcg2.c
+++ b/lib/tpm_tcg2.c
@@ -207,37 +207,17 @@  static int tcg2_log_append_check(struct tcg2_event_log *elog, u32 pcr_index,
 
 static int tcg2_log_init(struct udevice *dev, struct tcg2_event_log *elog)
 {
+	struct tpm_chip_priv *priv = dev_get_uclass_priv(dev);
 	struct tcg_efi_spec_id_event *ev;
 	struct tcg_pcr_event *log;
 	u32 event_size;
 	u32 count = 0;
 	u32 log_size;
-	u32 active;
 	size_t i;
 	u16 len;
-	int rc;
-
-	rc = tcg2_get_active_pcr_banks(dev, &active);
-	if (rc)
-		return rc;
 
+	count = priv->active_bank_count;
 	event_size = offsetof(struct tcg_efi_spec_id_event, digest_sizes);
-	for (i = 0; i < ARRAY_SIZE(hash_algo_list); ++i) {
-		if (!(active & hash_algo_list[i].hash_mask))
-			continue;
-
-		switch (hash_algo_list[i].hash_alg) {
-		case TPM2_ALG_SHA1:
-		case TPM2_ALG_SHA256:
-		case TPM2_ALG_SHA384:
-		case TPM2_ALG_SHA512:
-			count++;
-			break;
-		default:
-			continue;
-		}
-	}
-
 	event_size += 1 +
 		(sizeof(struct tcg_efi_spec_id_event_algorithm_size) * count);
 	log_size = offsetof(struct tcg_pcr_event, event) + event_size;
@@ -264,19 +244,11 @@  static int tcg2_log_init(struct udevice *dev, struct tcg2_event_log *elog)
 	ev->uintn_size = sizeof(size_t) / sizeof(u32);
 	put_unaligned_le32(count, &ev->number_of_algorithms);
 
-	count = 0;
-	for (i = 0; i < ARRAY_SIZE(hash_algo_list); ++i) {
-		if (!(active & hash_algo_list[i].hash_mask))
-			continue;
-
-		len = hash_algo_list[i].hash_len;
-		if (!len)
-			continue;
-
-		put_unaligned_le16(hash_algo_list[i].hash_alg,
-				   &ev->digest_sizes[count].algorithm_id);
-		put_unaligned_le16(len, &ev->digest_sizes[count].digest_size);
-		count++;
+	for (i = 0; i < count; ++i) {
+		len = tpm2_algorithm_to_len(priv->active_banks[i]);
+		put_unaligned_le16(priv->active_banks[i],
+				   &ev->digest_sizes[i].algorithm_id);
+		put_unaligned_le16(len, &ev->digest_sizes[i].digest_size);
 	}
 
 	*((u8 *)ev + (event_size - 1)) = 0;