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86c639ce08
Make 'struct mmc_request' contain a pointer to the request's 'struct bio_crypt_ctx' directly, instead of extracting a 32-bit DUN from it which is a cqhci-crypto specific detail. This keeps the cqhci crypto specific details in the cqhci module, and it makes mmc_core and mmc_block ready for MMC crypto hardware that accepts the DUN and/or key in a way that is more flexible than that which will be specified by the eMMC v5.2 standard. Exynos SoCs are an example of such hardware, as their inline encryption hardware takes keys directly (it has no concept of keyslots) and supports 128-bit DUNs. Note that the 32-bit DUN length specified by the standard is very restrictive, so it is likely that more hardware will support longer DUNs despite it not following the standard. Thus, limiting the scope of the 32-bit DUN assumption to the place that actually needs it is warranted. Signed-off-by: Eric Biggers <ebiggers@google.com> Link: https://lore.kernel.org/r/20210721154738.3966463-1-ebiggers@kernel.org Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
50 lines
1 KiB
C
50 lines
1 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* CQHCI crypto engine (inline encryption) support
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*
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* Copyright 2020 Google LLC
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*/
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#ifndef LINUX_MMC_CQHCI_CRYPTO_H
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#define LINUX_MMC_CQHCI_CRYPTO_H
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#include <linux/mmc/host.h>
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#include "cqhci.h"
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#ifdef CONFIG_MMC_CRYPTO
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int cqhci_crypto_init(struct cqhci_host *host);
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/*
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* Returns the crypto bits that should be set in bits 64-127 of the
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* task descriptor.
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*/
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static inline u64 cqhci_crypto_prep_task_desc(struct mmc_request *mrq)
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{
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if (!mrq->crypto_ctx)
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return 0;
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/* We set max_dun_bytes_supported=4, so all DUNs should be 32-bit. */
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WARN_ON_ONCE(mrq->crypto_ctx->bc_dun[0] > U32_MAX);
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return CQHCI_CRYPTO_ENABLE_BIT |
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CQHCI_CRYPTO_KEYSLOT(mrq->crypto_key_slot) |
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mrq->crypto_ctx->bc_dun[0];
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}
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#else /* CONFIG_MMC_CRYPTO */
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static inline int cqhci_crypto_init(struct cqhci_host *host)
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{
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return 0;
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}
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static inline u64 cqhci_crypto_prep_task_desc(struct mmc_request *mrq)
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{
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return 0;
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}
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#endif /* !CONFIG_MMC_CRYPTO */
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#endif /* LINUX_MMC_CQHCI_CRYPTO_H */
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