diff options
author | Eric Biggers <ebiggers@google.com> | 2021-01-26 03:14:48 +0300 |
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committer | Ulf Hansson <ulf.hansson@linaro.org> | 2021-02-01 14:02:33 +0300 |
commit | 93f1c150cb0d043e1e8985db7824b4e2e1ac653f (patch) | |
tree | 5c999fb86e72da2a2a12b871c122588ff5907598 /drivers/mmc/core/crypto.c | |
parent | d76d9d7d1009968dd3a0fc30e5f5ee9fbffc1350 (diff) | |
download | linux-93f1c150cb0d043e1e8985db7824b4e2e1ac653f.tar.xz |
mmc: core: Add basic support for inline encryption
In preparation for adding CQHCI crypto engine (inline encryption)
support, add the code required to make mmc_core and mmc_block aware of
inline encryption. Specifically:
- Add a capability flag MMC_CAP2_CRYPTO to struct mmc_host. Drivers
will set this if the host and driver support inline encryption.
- Embed a blk_keyslot_manager in struct mmc_host. Drivers will
initialize this (as a device-managed resource) if the host and driver
support inline encryption. mmc_block registers this keyslot manager
with the request_queue of any MMC card attached to the host.
- Make mmc_block copy the crypto keyslot and crypto data unit number
from struct request to struct mmc_request, so that drivers will have
access to them.
- If the MMC host is reset, reprogram all the keyslots to ensure that
the software state stays in sync with the hardware state.
Co-developed-by: Satya Tangirala <satyat@google.com>
Signed-off-by: Satya Tangirala <satyat@google.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Satya Tangirala <satyat@google.com>
Reviewed-and-tested-by: Peng Zhou <peng.zhou@mediatek.com>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Link: https://lore.kernel.org/r/20210126001456.382989-2-ebiggers@kernel.org
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc/core/crypto.c')
-rw-r--r-- | drivers/mmc/core/crypto.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/drivers/mmc/core/crypto.c b/drivers/mmc/core/crypto.c new file mode 100644 index 000000000000..419a368f8402 --- /dev/null +++ b/drivers/mmc/core/crypto.c @@ -0,0 +1,48 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * MMC crypto engine (inline encryption) support + * + * Copyright 2020 Google LLC + */ + +#include <linux/blk-crypto.h> +#include <linux/mmc/host.h> + +#include "core.h" +#include "crypto.h" +#include "queue.h" + +void mmc_crypto_set_initial_state(struct mmc_host *host) +{ + /* Reset might clear all keys, so reprogram all the keys. */ + if (host->caps2 & MMC_CAP2_CRYPTO) + blk_ksm_reprogram_all_keys(&host->ksm); +} + +void mmc_crypto_setup_queue(struct request_queue *q, struct mmc_host *host) +{ + if (host->caps2 & MMC_CAP2_CRYPTO) + blk_ksm_register(&host->ksm, q); +} +EXPORT_SYMBOL_GPL(mmc_crypto_setup_queue); + +void mmc_crypto_prepare_req(struct mmc_queue_req *mqrq) +{ + struct request *req = mmc_queue_req_to_req(mqrq); + struct mmc_request *mrq = &mqrq->brq.mrq; + + if (!req->crypt_keyslot) + return; + + mrq->crypto_enabled = true; + mrq->crypto_key_slot = blk_ksm_get_slot_idx(req->crypt_keyslot); + + /* + * For now we assume that all MMC drivers set max_dun_bytes_supported=4, + * which is the limit for CQHCI crypto. So all DUNs should be 32-bit. + */ + WARN_ON_ONCE(req->crypt_ctx->bc_dun[0] > U32_MAX); + + mrq->data_unit_num = req->crypt_ctx->bc_dun[0]; +} +EXPORT_SYMBOL_GPL(mmc_crypto_prepare_req); |