| Message ID | 20201112194011.103774-2-ebiggers@kernel.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | eMMC inline encryption support | expand |
On 12/11/20 9:40 pm, Eric Biggers wrote: > From: Eric Biggers <ebiggers@google.com> > > 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 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. mmc_core destroys this keyslot manager > when freeing the mmc_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> > Signed-off-by: Eric Biggers <ebiggers@google.com> Acked-by: Adrian Hunter <adrian.hunter@intel.com> > --- > drivers/mmc/core/Kconfig | 8 ++++++ > drivers/mmc/core/Makefile | 1 + > drivers/mmc/core/block.c | 3 +++ > drivers/mmc/core/core.c | 3 +++ > drivers/mmc/core/crypto.c | 54 +++++++++++++++++++++++++++++++++++++++ > drivers/mmc/core/crypto.h | 46 +++++++++++++++++++++++++++++++++ > drivers/mmc/core/host.c | 2 ++ > drivers/mmc/core/queue.c | 3 +++ > include/linux/mmc/core.h | 6 +++++ > include/linux/mmc/host.h | 7 +++++ > 10 files changed, 133 insertions(+) > create mode 100644 drivers/mmc/core/crypto.c > create mode 100644 drivers/mmc/core/crypto.h > > diff --git a/drivers/mmc/core/Kconfig b/drivers/mmc/core/Kconfig > index c12fe13e4b147..ae8b69aee6190 100644 > --- a/drivers/mmc/core/Kconfig > +++ b/drivers/mmc/core/Kconfig > @@ -81,3 +81,11 @@ config MMC_TEST > This driver is only of interest to those developing or > testing a host driver. Most people should say N here. > > +config MMC_CRYPTO > + bool "MMC Crypto Engine Support" > + depends on BLK_INLINE_ENCRYPTION > + help > + Enable Crypto Engine Support in MMC. > + Enabling this makes it possible for the kernel to use the crypto > + capabilities of the MMC device (if present) to perform crypto > + operations on data being transferred to/from the device. > diff --git a/drivers/mmc/core/Makefile b/drivers/mmc/core/Makefile > index 95ffe008ebdf8..6a907736cd7a5 100644 > --- a/drivers/mmc/core/Makefile > +++ b/drivers/mmc/core/Makefile > @@ -18,3 +18,4 @@ obj-$(CONFIG_MMC_BLOCK) += mmc_block.o > mmc_block-objs := block.o queue.o > obj-$(CONFIG_MMC_TEST) += mmc_test.o > obj-$(CONFIG_SDIO_UART) += sdio_uart.o > +mmc_core-$(CONFIG_MMC_CRYPTO) += crypto.o > diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c > index 8d3df0be0355c..eaf2f10743260 100644 > --- a/drivers/mmc/core/block.c > +++ b/drivers/mmc/core/block.c > @@ -51,6 +51,7 @@ > #include "block.h" > #include "core.h" > #include "card.h" > +#include "crypto.h" > #include "host.h" > #include "bus.h" > #include "mmc_ops.h" > @@ -1247,6 +1248,8 @@ static void mmc_blk_data_prep(struct mmc_queue *mq, struct mmc_queue_req *mqrq, > > memset(brq, 0, sizeof(struct mmc_blk_request)); > > + mmc_crypto_prepare_req(mqrq); > + > brq->mrq.data = &brq->data; > brq->mrq.tag = req->tag; > > diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c > index d42037f0f10d7..275de270232b3 100644 > --- a/drivers/mmc/core/core.c > +++ b/drivers/mmc/core/core.c > @@ -37,6 +37,7 @@ > > #include "core.h" > #include "card.h" > +#include "crypto.h" > #include "bus.h" > #include "host.h" > #include "sdio_bus.h" > @@ -992,6 +993,8 @@ void mmc_set_initial_state(struct mmc_host *host) > host->ops->hs400_enhanced_strobe(host, &host->ios); > > mmc_set_ios(host); > + > + mmc_crypto_set_initial_state(host); > } > > /** > diff --git a/drivers/mmc/core/crypto.c b/drivers/mmc/core/crypto.c > new file mode 100644 > index 0000000000000..4f47eb4740db0 > --- /dev/null > +++ b/drivers/mmc/core/crypto.c > @@ -0,0 +1,54 @@ > +// 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_free_host(struct mmc_host *host) > +{ > + if (host->caps2 & MMC_CAP2_CRYPTO) > + blk_ksm_destroy(&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); > diff --git a/drivers/mmc/core/crypto.h b/drivers/mmc/core/crypto.h > new file mode 100644 > index 0000000000000..4780639b832f4 > --- /dev/null > +++ b/drivers/mmc/core/crypto.h > @@ -0,0 +1,46 @@ > +/* SPDX-License-Identifier: GPL-2.0-only */ > +/* > + * MMC crypto engine (inline encryption) support > + * > + * Copyright 2020 Google LLC > + */ > + > +#ifndef _MMC_CORE_CRYPTO_H > +#define _MMC_CORE_CRYPTO_H > + > +struct mmc_host; > +struct mmc_queue_req; > +struct request_queue; > + > +#ifdef CONFIG_MMC_CRYPTO > + > +void mmc_crypto_set_initial_state(struct mmc_host *host); > + > +void mmc_crypto_free_host(struct mmc_host *host); > + > +void mmc_crypto_setup_queue(struct request_queue *q, struct mmc_host *host); > + > +void mmc_crypto_prepare_req(struct mmc_queue_req *mqrq); > + > +#else /* CONFIG_MMC_CRYPTO */ > + > +static inline void mmc_crypto_set_initial_state(struct mmc_host *host) > +{ > +} > + > +static inline void mmc_crypto_free_host(struct mmc_host *host) > +{ > +} > + > +static inline void mmc_crypto_setup_queue(struct request_queue *q, > + struct mmc_host *host) > +{ > +} > + > +static inline void mmc_crypto_prepare_req(struct mmc_queue_req *mqrq) > +{ > +} > + > +#endif /* !CONFIG_MMC_CRYPTO */ > + > +#endif /* _MMC_CORE_CRYPTO_H */ > diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c > index 96b2ca1f1b06d..d962b9ca0e37a 100644 > --- a/drivers/mmc/core/host.c > +++ b/drivers/mmc/core/host.c > @@ -25,6 +25,7 @@ > #include <linux/mmc/slot-gpio.h> > > #include "core.h" > +#include "crypto.h" > #include "host.h" > #include "slot-gpio.h" > #include "pwrseq.h" > @@ -532,6 +533,7 @@ EXPORT_SYMBOL(mmc_remove_host); > */ > void mmc_free_host(struct mmc_host *host) > { > + mmc_crypto_free_host(host); > mmc_pwrseq_free(host); > put_device(&host->class_dev); > } > diff --git a/drivers/mmc/core/queue.c b/drivers/mmc/core/queue.c > index de7cb0369c308..d96db852bb91a 100644 > --- a/drivers/mmc/core/queue.c > +++ b/drivers/mmc/core/queue.c > @@ -19,6 +19,7 @@ > #include "block.h" > #include "core.h" > #include "card.h" > +#include "crypto.h" > #include "host.h" > > #define MMC_DMA_MAP_MERGE_SEGMENTS 512 > @@ -405,6 +406,8 @@ static void mmc_setup_queue(struct mmc_queue *mq, struct mmc_card *card) > mutex_init(&mq->complete_lock); > > init_waitqueue_head(&mq->wait); > + > + mmc_crypto_setup_queue(mq->queue, host); > } > > static inline bool mmc_merge_capable(struct mmc_host *host) > diff --git a/include/linux/mmc/core.h b/include/linux/mmc/core.h > index 29aa507116261..ab19245e99451 100644 > --- a/include/linux/mmc/core.h > +++ b/include/linux/mmc/core.h > @@ -162,6 +162,12 @@ struct mmc_request { > bool cap_cmd_during_tfr; > > int tag; > + > +#ifdef CONFIG_MMC_CRYPTO > + bool crypto_enabled; > + int crypto_key_slot; > + u32 data_unit_num; > +#endif > }; > > struct mmc_card; > diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h > index c079b932330f2..550460bf1b37c 100644 > --- a/include/linux/mmc/host.h > +++ b/include/linux/mmc/host.h > @@ -15,6 +15,7 @@ > #include <linux/mmc/card.h> > #include <linux/mmc/pm.h> > #include <linux/dma-direction.h> > +#include <linux/keyslot-manager.h> > > struct mmc_ios { > unsigned int clock; /* clock rate */ > @@ -377,6 +378,7 @@ struct mmc_host { > #define MMC_CAP2_CQE_DCMD (1 << 24) /* CQE can issue a direct command */ > #define MMC_CAP2_AVOID_3_3V (1 << 25) /* Host must negotiate down from 3.3V */ > #define MMC_CAP2_MERGE_CAPABLE (1 << 26) /* Host can merge a segment over the segment size */ > +#define MMC_CAP2_CRYPTO (1 << 27) /* Host supports inline encryption */ > > int fixed_drv_type; /* fixed driver type for non-removable media */ > > @@ -471,6 +473,11 @@ struct mmc_host { > bool cqe_enabled; > bool cqe_on; > > + /* Inline encryption support */ > +#ifdef CONFIG_MMC_CRYPTO > + struct blk_keyslot_manager ksm; > +#endif > + > /* Host Software Queue support */ > bool hsq_enabled; > >
diff --git a/drivers/mmc/core/Kconfig b/drivers/mmc/core/Kconfig index c12fe13e4b147..ae8b69aee6190 100644 --- a/drivers/mmc/core/Kconfig +++ b/drivers/mmc/core/Kconfig @@ -81,3 +81,11 @@ config MMC_TEST This driver is only of interest to those developing or testing a host driver. Most people should say N here. +config MMC_CRYPTO + bool "MMC Crypto Engine Support" + depends on BLK_INLINE_ENCRYPTION + help + Enable Crypto Engine Support in MMC. + Enabling this makes it possible for the kernel to use the crypto + capabilities of the MMC device (if present) to perform crypto + operations on data being transferred to/from the device. diff --git a/drivers/mmc/core/Makefile b/drivers/mmc/core/Makefile index 95ffe008ebdf8..6a907736cd7a5 100644 --- a/drivers/mmc/core/Makefile +++ b/drivers/mmc/core/Makefile @@ -18,3 +18,4 @@ obj-$(CONFIG_MMC_BLOCK) += mmc_block.o mmc_block-objs := block.o queue.o obj-$(CONFIG_MMC_TEST) += mmc_test.o obj-$(CONFIG_SDIO_UART) += sdio_uart.o +mmc_core-$(CONFIG_MMC_CRYPTO) += crypto.o diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c index 8d3df0be0355c..eaf2f10743260 100644 --- a/drivers/mmc/core/block.c +++ b/drivers/mmc/core/block.c @@ -51,6 +51,7 @@ #include "block.h" #include "core.h" #include "card.h" +#include "crypto.h" #include "host.h" #include "bus.h" #include "mmc_ops.h" @@ -1247,6 +1248,8 @@ static void mmc_blk_data_prep(struct mmc_queue *mq, struct mmc_queue_req *mqrq, memset(brq, 0, sizeof(struct mmc_blk_request)); + mmc_crypto_prepare_req(mqrq); + brq->mrq.data = &brq->data; brq->mrq.tag = req->tag; diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c index d42037f0f10d7..275de270232b3 100644 --- a/drivers/mmc/core/core.c +++ b/drivers/mmc/core/core.c @@ -37,6 +37,7 @@ #include "core.h" #include "card.h" +#include "crypto.h" #include "bus.h" #include "host.h" #include "sdio_bus.h" @@ -992,6 +993,8 @@ void mmc_set_initial_state(struct mmc_host *host) host->ops->hs400_enhanced_strobe(host, &host->ios); mmc_set_ios(host); + + mmc_crypto_set_initial_state(host); } /** diff --git a/drivers/mmc/core/crypto.c b/drivers/mmc/core/crypto.c new file mode 100644 index 0000000000000..4f47eb4740db0 --- /dev/null +++ b/drivers/mmc/core/crypto.c @@ -0,0 +1,54 @@ +// 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_free_host(struct mmc_host *host) +{ + if (host->caps2 & MMC_CAP2_CRYPTO) + blk_ksm_destroy(&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); diff --git a/drivers/mmc/core/crypto.h b/drivers/mmc/core/crypto.h new file mode 100644 index 0000000000000..4780639b832f4 --- /dev/null +++ b/drivers/mmc/core/crypto.h @@ -0,0 +1,46 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * MMC crypto engine (inline encryption) support + * + * Copyright 2020 Google LLC + */ + +#ifndef _MMC_CORE_CRYPTO_H +#define _MMC_CORE_CRYPTO_H + +struct mmc_host; +struct mmc_queue_req; +struct request_queue; + +#ifdef CONFIG_MMC_CRYPTO + +void mmc_crypto_set_initial_state(struct mmc_host *host); + +void mmc_crypto_free_host(struct mmc_host *host); + +void mmc_crypto_setup_queue(struct request_queue *q, struct mmc_host *host); + +void mmc_crypto_prepare_req(struct mmc_queue_req *mqrq); + +#else /* CONFIG_MMC_CRYPTO */ + +static inline void mmc_crypto_set_initial_state(struct mmc_host *host) +{ +} + +static inline void mmc_crypto_free_host(struct mmc_host *host) +{ +} + +static inline void mmc_crypto_setup_queue(struct request_queue *q, + struct mmc_host *host) +{ +} + +static inline void mmc_crypto_prepare_req(struct mmc_queue_req *mqrq) +{ +} + +#endif /* !CONFIG_MMC_CRYPTO */ + +#endif /* _MMC_CORE_CRYPTO_H */ diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c index 96b2ca1f1b06d..d962b9ca0e37a 100644 --- a/drivers/mmc/core/host.c +++ b/drivers/mmc/core/host.c @@ -25,6 +25,7 @@ #include <linux/mmc/slot-gpio.h> #include "core.h" +#include "crypto.h" #include "host.h" #include "slot-gpio.h" #include "pwrseq.h" @@ -532,6 +533,7 @@ EXPORT_SYMBOL(mmc_remove_host); */ void mmc_free_host(struct mmc_host *host) { + mmc_crypto_free_host(host); mmc_pwrseq_free(host); put_device(&host->class_dev); } diff --git a/drivers/mmc/core/queue.c b/drivers/mmc/core/queue.c index de7cb0369c308..d96db852bb91a 100644 --- a/drivers/mmc/core/queue.c +++ b/drivers/mmc/core/queue.c @@ -19,6 +19,7 @@ #include "block.h" #include "core.h" #include "card.h" +#include "crypto.h" #include "host.h" #define MMC_DMA_MAP_MERGE_SEGMENTS 512 @@ -405,6 +406,8 @@ static void mmc_setup_queue(struct mmc_queue *mq, struct mmc_card *card) mutex_init(&mq->complete_lock); init_waitqueue_head(&mq->wait); + + mmc_crypto_setup_queue(mq->queue, host); } static inline bool mmc_merge_capable(struct mmc_host *host) diff --git a/include/linux/mmc/core.h b/include/linux/mmc/core.h index 29aa507116261..ab19245e99451 100644 --- a/include/linux/mmc/core.h +++ b/include/linux/mmc/core.h @@ -162,6 +162,12 @@ struct mmc_request { bool cap_cmd_during_tfr; int tag; + +#ifdef CONFIG_MMC_CRYPTO + bool crypto_enabled; + int crypto_key_slot; + u32 data_unit_num; +#endif }; struct mmc_card; diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h index c079b932330f2..550460bf1b37c 100644 --- a/include/linux/mmc/host.h +++ b/include/linux/mmc/host.h @@ -15,6 +15,7 @@ #include <linux/mmc/card.h> #include <linux/mmc/pm.h> #include <linux/dma-direction.h> +#include <linux/keyslot-manager.h> struct mmc_ios { unsigned int clock; /* clock rate */ @@ -377,6 +378,7 @@ struct mmc_host { #define MMC_CAP2_CQE_DCMD (1 << 24) /* CQE can issue a direct command */ #define MMC_CAP2_AVOID_3_3V (1 << 25) /* Host must negotiate down from 3.3V */ #define MMC_CAP2_MERGE_CAPABLE (1 << 26) /* Host can merge a segment over the segment size */ +#define MMC_CAP2_CRYPTO (1 << 27) /* Host supports inline encryption */ int fixed_drv_type; /* fixed driver type for non-removable media */ @@ -471,6 +473,11 @@ struct mmc_host { bool cqe_enabled; bool cqe_on; + /* Inline encryption support */ +#ifdef CONFIG_MMC_CRYPTO + struct blk_keyslot_manager ksm; +#endif + /* Host Software Queue support */ bool hsq_enabled;