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crypto: tegra: Reserve keyslots to allocate dynamically

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The HW supports only storing 15 keys at a time. This limits the number
of tfms that can work without failutes. Reserve keyslots to solve this
and use the reserved ones during the encryption/decryption operation.
This allow users to have the capability of hardware protected keys
and faster operations if there are limited number of tfms while not
halting the operation if there are more tfms.

Bug 4883011

Signed-off-by: Akhil R <akhilrajeev@nvidia.com>
Change-Id: I7de17eb1acf3b5a9f55a42e9df2aa8b64e20cb6d
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3347661
GVS: buildbot_gerritrpt <buildbot_gerritrpt@nvidia.com>
Reviewed-by: Laxman Dewangan <ldewangan@nvidia.com>
This commit is contained in:
Akhil R
2025-01-15 13:09:53 +05:30
committed by Jon Hunter
parent e09a390449
commit fc72250a45
5 changed files with 242 additions and 62 deletions
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17
drivers/crypto/tegra/tegra-se-key.c
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@@ -314,3 +314,20 @@ int tegra_key_submit(struct tegra_se *se, const u8 *key, u32 keylen, u32 alg, u3
return 0;
}
void tegra_key_invalidate_reserved(struct tegra_se *se, u32 keyid, u32 alg)
{
u8 zkey[AES_MAX_KEY_SIZE] = {0};
if (!keyid)
return;
/* Overwrite the key with 0s */
tegra_key_insert(se, zkey, AES_MAX_KEY_SIZE, keyid, alg);
}
inline int tegra_key_submit_reserved(struct tegra_se *se, const u8 *key,
u32 keylen, u32 alg, u32 *keyid)
{
return tegra_key_insert(se, key, keylen, *keyid, alg);
}