233 lines
6.7 KiB
C
Executable File
233 lines
6.7 KiB
C
Executable File
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved.
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*/
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#include <ufs/ufshcd.h>
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#include <ufs/ufshcd-crypto.h>
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#include "ufs-qcom.h"
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#include <soc/qcom/ice.h>
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/* Blk-crypto modes supported by UFS crypto */
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static const struct ufs_crypto_alg_entry {
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enum ufs_crypto_alg ufs_alg;
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enum ufs_crypto_key_size ufs_key_size;
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} ufs_crypto_algs[BLK_ENCRYPTION_MODE_MAX] = {
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[BLK_ENCRYPTION_MODE_AES_256_XTS] = {
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.ufs_alg = UFS_CRYPTO_ALG_AES_XTS,
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.ufs_key_size = UFS_CRYPTO_KEY_SIZE_256,
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},
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};
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static int ufshcd_qti_crypto_keyslot_program(struct blk_crypto_profile *profile,
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const struct blk_crypto_key *key,
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unsigned int slot)
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{
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struct ufs_hba *hba =
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container_of(profile, struct ufs_hba, crypto_profile);
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struct ufs_qcom_host *host = ufshcd_get_variant(hba);
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const union ufs_crypto_cap_entry *ccap_array = hba->crypto_cap_array;
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const struct ufs_crypto_alg_entry *alg =
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&ufs_crypto_algs[key->crypto_cfg.crypto_mode];
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u8 data_unit_mask = key->crypto_cfg.data_unit_size / 512;
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int i;
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int cap_idx = -1;
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union ufs_crypto_cfg_entry cfg = {};
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int err;
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u8 ice_key_size;
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BUILD_BUG_ON(UFS_CRYPTO_KEY_SIZE_INVALID != 0);
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for (i = 0; i < hba->crypto_capabilities.num_crypto_cap; i++) {
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if (ccap_array[i].algorithm_id == alg->ufs_alg &&
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ccap_array[i].key_size == alg->ufs_key_size &&
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(ccap_array[i].sdus_mask & data_unit_mask)) {
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cap_idx = i;
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break;
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}
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}
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if (WARN_ON(cap_idx < 0))
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return -EOPNOTSUPP;
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cfg.data_unit_size = data_unit_mask;
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cfg.crypto_cap_idx = cap_idx;
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cfg.config_enable = UFS_CRYPTO_CONFIGURATION_ENABLE;
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if (key->crypto_cfg.key_type != BLK_CRYPTO_KEY_TYPE_HW_WRAPPED) {
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if (ccap_array[cap_idx].algorithm_id == UFS_CRYPTO_ALG_AES_XTS) {
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/* In XTS mode, the blk_crypto_key's size is already doubled */
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memcpy(cfg.crypto_key, key->raw, key->size / 2);
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memcpy(cfg.crypto_key + UFS_CRYPTO_KEY_MAX_SIZE / 2,
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key->raw + key->size / 2, key->size / 2);
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} else {
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memcpy(cfg.crypto_key, key->raw, key->size);
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}
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}
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if (key->crypto_cfg.key_type == BLK_CRYPTO_KEY_TYPE_HW_WRAPPED)
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ice_key_size = QCOM_ICE_CRYPTO_KEY_SIZE_WRAPPED;
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else
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ice_key_size = QCOM_ICE_CRYPTO_KEY_SIZE_256;
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if (host->reset_in_progress) {
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pr_err("UFS host reset in progress, state = 0x%x\n",
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hba->ufshcd_state);
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return -EINVAL;
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}
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ufshcd_hold(hba);
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err = qcom_ice_program_key_hwkm(host->ice,
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QCOM_ICE_CRYPTO_ALG_AES_XTS,
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ice_key_size, key,
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cfg.data_unit_size, slot);
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if (err)
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pr_err("%s: error programming key, err = %d, slot = %d\n",
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__func__, err, slot);
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ufshcd_release(hba);
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memzero_explicit(&cfg, sizeof(cfg));
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return err;
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}
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static int ufshcd_qti_crypto_keyslot_evict(struct blk_crypto_profile *profile,
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const struct blk_crypto_key *key,
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unsigned int slot)
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{
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struct ufs_hba *hba =
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container_of(profile, struct ufs_hba, crypto_profile);
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struct ufs_qcom_host *host = ufshcd_get_variant(hba);
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int err = 0;
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if (host->reset_in_progress) {
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pr_err("UFS host reset in progress, state = 0x%x\n",
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hba->ufshcd_state);
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return -EINVAL;
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}
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ufshcd_hold(hba);
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err = qcom_ice_evict_key(host->ice, slot);
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if (err)
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pr_err("%s: error evicting key, err = %d, slot = %d\n",
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__func__, err, slot);
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ufshcd_release(hba);
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return err;
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}
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static int ufshcd_qti_crypto_derive_sw_secret(struct blk_crypto_profile *profile,
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const u8 wkey[], size_t wkey_size,
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u8 sw_secret[BLK_CRYPTO_SW_SECRET_SIZE])
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{
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struct ufs_hba *hba =
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container_of(profile, struct ufs_hba, crypto_profile);
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struct ufs_qcom_host *host = ufshcd_get_variant(hba);
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int err;
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err = qcom_ice_derive_sw_secret(host->ice, wkey, wkey_size, sw_secret);
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if (err)
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pr_err("%s: error deriving software secret, err = %d\n",
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__func__, err);
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return err;
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}
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static const struct blk_crypto_ll_ops ufshcd_qti_crypto_ops = {
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.keyslot_program = ufshcd_qti_crypto_keyslot_program,
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.keyslot_evict = ufshcd_qti_crypto_keyslot_evict,
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.derive_sw_secret = ufshcd_qti_crypto_derive_sw_secret,
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};
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static enum blk_crypto_mode_num
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ufshcd_find_blk_crypto_mode(union ufs_crypto_cap_entry cap)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(ufs_crypto_algs); i++) {
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BUILD_BUG_ON(UFS_CRYPTO_KEY_SIZE_INVALID != 0);
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if (ufs_crypto_algs[i].ufs_alg == cap.algorithm_id &&
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ufs_crypto_algs[i].ufs_key_size == cap.key_size) {
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return i;
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}
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}
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return BLK_ENCRYPTION_MODE_INVALID;
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}
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/**
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* ufshcd_hba_init_crypto_capabilities - Read crypto capabilities, init crypto
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* fields in hba
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* @hba: Per adapter instance
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*
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* Return: 0 if crypto was initialized or is not supported, else a -errno value.
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*/
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int ufshcd_qti_hba_init_crypto_capabilities(struct ufs_hba *hba)
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{
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int cap_idx;
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int err = 0;
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enum blk_crypto_mode_num blk_mode_num;
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/*
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* Don't use crypto if either the hardware doesn't advertise the
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* standard crypto capability bit *or* if the vendor specific driver
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* hasn't advertised that crypto is supported.
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*/
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if (!(ufshcd_readl(hba, REG_CONTROLLER_CAPABILITIES) &
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MASK_CRYPTO_SUPPORT))
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goto out;
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if (!(hba->caps & UFSHCD_CAP_CRYPTO))
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goto out;
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hba->crypto_capabilities.reg_val =
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cpu_to_le32(ufshcd_readl(hba, REG_UFS_CCAP));
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hba->crypto_cfg_register =
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(u32)hba->crypto_capabilities.config_array_ptr * 0x100;
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hba->crypto_cap_array =
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devm_kcalloc(hba->dev, hba->crypto_capabilities.num_crypto_cap,
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sizeof(hba->crypto_cap_array[0]), GFP_KERNEL);
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if (!hba->crypto_cap_array) {
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err = -ENOMEM;
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goto out;
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}
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/* The actual number of configurations supported is (CFGC+1) */
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err = devm_blk_crypto_profile_init(hba->dev, &hba->crypto_profile,
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hba->crypto_capabilities.config_count + 1);
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if (err)
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goto out;
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hba->crypto_profile.ll_ops = ufshcd_qti_crypto_ops;
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/* UFS only supports 8 bytes for any DUN */
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hba->crypto_profile.max_dun_bytes_supported = 8;
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hba->crypto_profile.key_types_supported = BLK_CRYPTO_KEY_TYPE_HW_WRAPPED;
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hba->crypto_profile.dev = hba->dev;
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/*
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* Cache all the UFS crypto capabilities and advertise the supported
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* crypto modes and data unit sizes to the block layer.
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*/
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for (cap_idx = 0; cap_idx < hba->crypto_capabilities.num_crypto_cap;
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cap_idx++) {
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hba->crypto_cap_array[cap_idx].reg_val =
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cpu_to_le32(ufshcd_readl(hba,
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REG_UFS_CRYPTOCAP +
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cap_idx * sizeof(__le32)));
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blk_mode_num =
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ufshcd_find_blk_crypto_mode(hba->crypto_cap_array[cap_idx]);
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if (blk_mode_num != BLK_ENCRYPTION_MODE_INVALID)
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hba->crypto_profile.modes_supported[blk_mode_num] |=
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hba->crypto_cap_array[cap_idx].sdus_mask * 512;
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}
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return 0;
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out:
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/* Indicate that init failed by clearing UFSHCD_CAP_CRYPTO */
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hba->caps &= ~UFSHCD_CAP_CRYPTO;
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return err;
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}
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EXPORT_SYMBOL_GPL(ufshcd_qti_hba_init_crypto_capabilities);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("UFS Crypto ops QTI implementation");
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