Re: [PATCH 3/8] mmc: cqhci: add support for inline encryption

Adrian Hunter
2020-12-02T13:15:56Z

On 12/11/20 9:40 pm, Eric Biggers wrote:
> From: Eric Biggers <ebiggers@google.com>
>
> Add support for eMMC inline encryption using the blk-crypto framework
> (Documentation/block/inline-encryption.rst).
>
> eMMC inline encryption support is specified by the upcoming JEDEC eMMC
> v5.2 specification. It is only specified for the CQ interface, not the
> non-CQ interface. Although the eMMC v5.2 specification hasn't been
> officially released yet, the crypto support was already agreed on
> several years ago, and it was already implemented by at least two major
> hardware vendors. Lots of hardware in the field already supports and
> uses it, e.g. Snapdragon 630 to give one example.
>
> eMMC inline encryption support is very similar to the UFS inline
> encryption support which was standardized in the UFS v2.1 specification
> and was already upstreamed. The only major difference is that eMMC
> limits data unit numbers to 32 bits, unlike UFS's 64 bits.
>
> Like we did with UFS, make the crypto support opt-in by individual
> drivers; don't enable it automatically whenever the hardware declares
> crypto support. This is necessary because in every case we've seen,
> some extra vendor-specific logic is needed to use the crypto support.
>
> Co-developed-by: Satya Tangirala <satyat@google.com>
> Signed-off-by: Satya Tangirala <satyat@google.com>
> Signed-off-by: Eric Biggers <ebiggers@google.com>

One minor comment and a question below.

> ---
> drivers/mmc/host/Makefile | 1 +
> drivers/mmc/host/cqhci-core.c | 66 +++++++--
> drivers/mmc/host/cqhci-crypto.c | 233 ++++++++++++++++++++++++++++++++
> drivers/mmc/host/cqhci-crypto.h | 47 +++++++
> drivers/mmc/host/cqhci.h | 81 ++++++++++-
> 5 files changed, 416 insertions(+), 12 deletions(-)
> create mode 100644 drivers/mmc/host/cqhci-crypto.c
> create mode 100644 drivers/mmc/host/cqhci-crypto.h
>
> diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
> index 20c2f9463d0dc..35158508ab63d 100644
> --- a/drivers/mmc/host/Makefile
> +++ b/drivers/mmc/host/Makefile
> @@ -105,6 +105,7 @@ obj-$(CONFIG_MMC_SDHCI_OMAP) += sdhci-omap.o
> obj-$(CONFIG_MMC_SDHCI_SPRD) += sdhci-sprd.o
> obj-$(CONFIG_MMC_CQHCI) += cqhci.o
> cqhci-y += cqhci-core.o
> +cqhci-$(CONFIG_MMC_CRYPTO) += cqhci-crypto.o
> obj-$(CONFIG_MMC_HSQ) += mmc_hsq.o
>
> ifeq ($(CONFIG_CB710_DEBUG),y)
> diff --git a/drivers/mmc/host/cqhci-core.c b/drivers/mmc/host/cqhci-core.c
> index 697fe40756bf2..ac0f886b1e7d2 100644
> --- a/drivers/mmc/host/cqhci-core.c
> +++ b/drivers/mmc/host/cqhci-core.c
> @@ -18,6 +18,7 @@
> #include <linux/mmc/card.h>
>
> #include "cqhci.h"
> +#include "cqhci-crypto.h"
>
> #define DCMD_SLOT 31
> #define NUM_SLOTS 32
> @@ -258,6 +259,9 @@ static void __cqhci_enable(struct cqhci_host *cq_host)
> if (cq_host->caps & CQHCI_TASK_DESC_SZ_128)
> cqcfg |= CQHCI_TASK_DESC_SZ;
>
> + if (mmc->caps2 & MMC_CAP2_CRYPTO)
> + cqcfg |= CQHCI_CRYPTO_GENERAL_ENABLE;
> +
> cqhci_writel(cq_host, cqcfg, CQHCI_CFG);
>
> cqhci_writel(cq_host, lower_32_bits(cq_host->desc_dma_base),
> @@ -408,13 +412,15 @@ static void cqhci_disable(struct mmc_host *mmc)
> }
>
> static void cqhci_prep_task_desc(struct mmc_request *mrq,
> - u64 *data, bool intr)
> + struct cqhci_host *cq_host, int tag)

It would be neater if the changes to cqhci_prep_task_desc() parameters could
be a separate patch.

> {
> + __le64 *task_desc = (__le64 __force *)get_desc(cq_host, tag);
> u32 req_flags = mrq->data->flags;
> + u64 desc0;
>
> - *data = CQHCI_VALID(1) |
> + desc0 = CQHCI_VALID(1) |
> CQHCI_END(1) |
> - CQHCI_INT(intr) |
> + CQHCI_INT(1) |
> CQHCI_ACT(0x5) |
> CQHCI_FORCED_PROG(!!(req_flags & MMC_DATA_FORCED_PRG)) |
> CQHCI_DATA_TAG(!!(req_flags & MMC_DATA_DAT_TAG)) |
> @@ -425,8 +431,19 @@ static void cqhci_prep_task_desc(struct mmc_request *mrq,
> CQHCI_BLK_COUNT(mrq->data->blocks) |
> CQHCI_BLK_ADDR((u64)mrq->data->blk_addr);
>
> - pr_debug("%s: cqhci: tag %d task descriptor 0x%016llx\n",
> - mmc_hostname(mrq->host), mrq->tag, (unsigned long long)*data);
> + task_desc[0] = cpu_to_le64(desc0);
> +
> + if (cq_host->caps & CQHCI_TASK_DESC_SZ_128) {
> + u64 desc1 = cqhci_crypto_prep_task_desc(mrq);
> +
> + task_desc[1] = cpu_to_le64(desc1);
> +
> + pr_debug("%s: cqhci: tag %d task descriptor 0x%016llx%016llx\n",
> + mmc_hostname(mrq->host), mrq->tag, desc1, desc0);
> + } else {
> + pr_debug("%s: cqhci: tag %d task descriptor 0x%016llx\n",
> + mmc_hostname(mrq->host), mrq->tag, desc0);
> + }
> }
>
> static int cqhci_dma_map(struct mmc_host *host, struct mmc_request *mrq)
> @@ -567,8 +584,6 @@ static inline int cqhci_tag(struct mmc_request *mrq)
> static int cqhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
> {
> int err = 0;
> - u64 data = 0;
> - u64 *task_desc = NULL;
> int tag = cqhci_tag(mrq);
> struct cqhci_host *cq_host = mmc->cqe_private;
> unsigned long flags;
> @@ -598,9 +613,8 @@ static int cqhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
> }
>
> if (mrq->data) {
> - task_desc = (__le64 __force *)get_desc(cq_host, tag);
> - cqhci_prep_task_desc(mrq, &data, 1);
> - *task_desc = cpu_to_le64(data);
> + cqhci_prep_task_desc(mrq, cq_host, tag);
> +
> err = cqhci_prep_tran_desc(mrq, cq_host, tag);
> if (err) {
> pr_err("%s: cqhci: failed to setup tx desc: %d\n",
> @@ -671,6 +685,7 @@ static void cqhci_error_irq(struct mmc_host *mmc, u32 status, int cmd_error,
> struct cqhci_host *cq_host = mmc->cqe_private;
> struct cqhci_slot *slot;
> u32 terri;
> + u32 tdpe;
> int tag;
>
> spin_lock(&cq_host->lock);
> @@ -709,6 +724,27 @@ static void cqhci_error_irq(struct mmc_host *mmc, u32 status, int cmd_error,
> }
> }
>
> + /*
> + * Handle "Invalid Crypto Configuration Error". This should never
> + * happen, since the block layer ensures that all crypto-enabled I/O
> + * requests have a valid keyslot before they reach the driver.
> + */
> + if (status & CQHCI_IS_ICCE) {
> + tdpe = cqhci_readl(cq_host, CQHCI_TDPE);
> + WARN_ONCE(1,
> + "%s: cqhci: invalid crypto configuration error. IRQ status: 0x%08x TDPE: 0x%08x\n",
> + mmc_hostname(mmc), status, tdpe);
> + while (tdpe != 0) {
> + tag = __ffs(tdpe);
> + tdpe &= ~(1 << tag);
> + slot = &cq_host->slot[tag];
> + if (!slot->mrq)
> + continue;
> + slot->flags = cqhci_error_flags(data_error, cmd_error);
> + cqhci_recovery_needed(mmc, slot->mrq, true);
> + }
> + }
> +

What about GCE?

> if (!cq_host->recovery_halt) {
> /*
> * The only way to guarantee forward progress is to mark at
> @@ -774,7 +810,8 @@ irqreturn_t cqhci_irq(struct mmc_host *mmc, u32 intmask, int cmd_error,
>
> pr_debug("%s: cqhci: IRQ status: 0x%08x\n", mmc_hostname(mmc), status);
>
> - if ((status & CQHCI_IS_RED) || cmd_error || data_error)
> + if ((status & (CQHCI_IS_RED | CQHCI_IS_GCE | CQHCI_IS_ICCE)) ||
> + cmd_error || data_error)
> cqhci_error_irq(mmc, status, cmd_error, data_error);
>
> if (status & CQHCI_IS_TCC) {
> @@ -1141,6 +1178,13 @@ int cqhci_init(struct cqhci_host *cq_host, struct mmc_host *mmc,
> goto out_err;
> }
>
> + err = cqhci_crypto_init(cq_host);
> + if (err) {
> + pr_err("%s: CQHCI crypto initialization failed\n",
> + mmc_hostname(mmc));
> + goto out_err;
> + }
> +
> spin_lock_init(&cq_host->lock);
>
> init_completion(&cq_host->halt_comp);
> diff --git a/drivers/mmc/host/cqhci-crypto.c b/drivers/mmc/host/cqhci-crypto.c
> new file mode 100644
> index 0000000000000..b14a5a15f5b52
> --- /dev/null
> +++ b/drivers/mmc/host/cqhci-crypto.c
> @@ -0,0 +1,233 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * CQHCI crypto engine (inline encryption) support
> + *
> + * Copyright 2020 Google LLC
> + */
> +
> +#include <linux/blk-crypto.h>
> +#include <linux/keyslot-manager.h>
> +#include <linux/mmc/host.h>
> +
> +#include "cqhci-crypto.h"
> +
> +/* Map from blk-crypto modes to CQHCI crypto algorithm IDs and key sizes */
> +static const struct cqhci_crypto_alg_entry {
> + enum cqhci_crypto_alg alg;
> + enum cqhci_crypto_key_size key_size;
> +} cqhci_crypto_algs[BLK_ENCRYPTION_MODE_MAX] = {
> + [BLK_ENCRYPTION_MODE_AES_256_XTS] = {
> + .alg = CQHCI_CRYPTO_ALG_AES_XTS,
> + .key_size = CQHCI_CRYPTO_KEY_SIZE_256,
> + },
> +};
> +
> +static inline struct cqhci_host *
> +cqhci_host_from_ksm(struct blk_keyslot_manager *ksm)
> +{
> + struct mmc_host *mmc = container_of(ksm, struct mmc_host, ksm);
> +
> + return mmc->cqe_private;
> +}
> +
> +static void cqhci_crypto_program_key(struct cqhci_host *cq_host,
> + const union cqhci_crypto_cfg_entry *cfg,
> + int slot)
> +{
> + u32 slot_offset = cq_host->crypto_cfg_register + slot * sizeof(*cfg);
> + int i;
> +
> + /* Clear CFGE */
> + cqhci_writel(cq_host, 0, slot_offset + 16 * sizeof(cfg->reg_val[0]));
> +
> + /* Write the key */
> + for (i = 0; i < 16; i++) {
> + cqhci_writel(cq_host, le32_to_cpu(cfg->reg_val[i]),
> + slot_offset + i * sizeof(cfg->reg_val[0]));
> + }
> + /* Write dword 17 */
> + cqhci_writel(cq_host, le32_to_cpu(cfg->reg_val[17]),
> + slot_offset + 17 * sizeof(cfg->reg_val[0]));
> + /* Write dword 16, which includes the new value of CFGE */
> + cqhci_writel(cq_host, le32_to_cpu(cfg->reg_val[16]),
> + slot_offset + 16 * sizeof(cfg->reg_val[0]));
> +}
> +
> +static int cqhci_crypto_keyslot_program(struct blk_keyslot_manager *ksm,
> + const struct blk_crypto_key *key,
> + unsigned int slot)
> +
> +{
> + struct cqhci_host *cq_host = cqhci_host_from_ksm(ksm);
> + const union cqhci_crypto_cap_entry *ccap_array =
> + cq_host->crypto_cap_array;
> + const struct cqhci_crypto_alg_entry *alg =
> + &cqhci_crypto_algs[key->crypto_cfg.crypto_mode];
> + u8 data_unit_mask = key->crypto_cfg.data_unit_size / 512;
> + int i;
> + int cap_idx = -1;
> + union cqhci_crypto_cfg_entry cfg = {};
> +
> + BUILD_BUG_ON(CQHCI_CRYPTO_KEY_SIZE_INVALID != 0);
> + for (i = 0; i < cq_host->crypto_capabilities.num_crypto_cap; i++) {
> + if (ccap_array[i].algorithm_id == alg->alg &&
> + ccap_array[i].key_size == alg->key_size &&
> + (ccap_array[i].sdus_mask & data_unit_mask)) {
> + cap_idx = i;
> + break;
> + }
> + }
> + if (WARN_ON(cap_idx < 0))
> + return -EOPNOTSUPP;
> +
> + cfg.data_unit_size = data_unit_mask;
> + cfg.crypto_cap_idx = cap_idx;
> + cfg.config_enable = CQHCI_CRYPTO_CONFIGURATION_ENABLE;
> +
> + if (ccap_array[cap_idx].algorithm_id == CQHCI_CRYPTO_ALG_AES_XTS) {
> + /* In XTS mode, the blk_crypto_key's size is already doubled */
> + memcpy(cfg.crypto_key, key->raw, key->size/2);
> + memcpy(cfg.crypto_key + CQHCI_CRYPTO_KEY_MAX_SIZE/2,
> + key->raw + key->size/2, key->size/2);
> + } else {
> + memcpy(cfg.crypto_key, key->raw, key->size);
> + }
> +
> + cqhci_crypto_program_key(cq_host, &cfg, slot);
> +
> + memzero_explicit(&cfg, sizeof(cfg));
> + return 0;
> +}
> +
> +static void cqhci_crypto_clear_keyslot(struct cqhci_host *cq_host, int slot)
> +{
> + /*
> + * Clear the crypto cfg on the device. Clearing CFGE
> + * might not be sufficient, so just clear the entire cfg.
> + */
> + union cqhci_crypto_cfg_entry cfg = {};
> +
> + cqhci_crypto_program_key(cq_host, &cfg, slot);
> +}
> +
> +static int cqhci_crypto_keyslot_evict(struct blk_keyslot_manager *ksm,
> + const struct blk_crypto_key *key,
> + unsigned int slot)
> +{
> + struct cqhci_host *cq_host = cqhci_host_from_ksm(ksm);
> +
> + cqhci_crypto_clear_keyslot(cq_host, slot);
> + return 0;
> +}
> +
> +static const struct blk_ksm_ll_ops cqhci_ksm_ops = {
> + .keyslot_program = cqhci_crypto_keyslot_program,
> + .keyslot_evict = cqhci_crypto_keyslot_evict,
> +};
> +
> +static enum blk_crypto_mode_num
> +cqhci_find_blk_crypto_mode(union cqhci_crypto_cap_entry cap)
> +{
> + int i;
> +
> + for (i = 0; i < ARRAY_SIZE(cqhci_crypto_algs); i++) {
> + BUILD_BUG_ON(CQHCI_CRYPTO_KEY_SIZE_INVALID != 0);
> + if (cqhci_crypto_algs[i].alg == cap.algorithm_id &&
> + cqhci_crypto_algs[i].key_size == cap.key_size)
> + return i;
> + }
> + return BLK_ENCRYPTION_MODE_INVALID;
> +}
> +
> +/**
> + * cqhci_crypto_init - initialize CQHCI crypto support
> + * @cq_host: a cqhci host
> + *
> + * If the driver previously set MMC_CAP2_CRYPTO and the CQE declares
> + * CQHCI_CAP_CS, initialize the crypto support. This involves reading the
> + * crypto capability registers, initializing the keyslot manager, clearing all
> + * keyslots, and enabling 128-bit task descriptors.
> + *
> + * Return: 0 if crypto was initialized or isn't supported; whether
> + * MMC_CAP2_CRYPTO remains set indicates which one of those cases it is.
> + * Also can return a negative errno value on unexpected error.
> + */
> +int cqhci_crypto_init(struct cqhci_host *cq_host)
> +{
> + struct mmc_host *mmc = cq_host->mmc;
> + struct device *dev = mmc_dev(mmc);
> + struct blk_keyslot_manager *ksm = &mmc->ksm;
> + unsigned int num_keyslots;
> + unsigned int cap_idx;
> + enum blk_crypto_mode_num blk_mode_num;
> + unsigned int slot;
> + int err = 0;
> +
> + if (!(mmc->caps2 & MMC_CAP2_CRYPTO) ||
> + !(cqhci_readl(cq_host, CQHCI_CAP) & CQHCI_CAP_CS))
> + goto out;
> +
> + cq_host->crypto_capabilities.reg_val =
> + cpu_to_le32(cqhci_readl(cq_host, CQHCI_CCAP));
> +
> + cq_host->crypto_cfg_register =
> + (u32)cq_host->crypto_capabilities.config_array_ptr * 0x100;
> +
> + cq_host->crypto_cap_array =
> + devm_kcalloc(dev, cq_host->crypto_capabilities.num_crypto_cap,
> + sizeof(cq_host->crypto_cap_array[0]), GFP_KERNEL);
> + if (!cq_host->crypto_cap_array) {
> + err = -ENOMEM;
> + goto out;
> + }
> +
> + /*
> + * CCAP.CFGC is off by one, so the actual number of crypto
> + * configurations (a.k.a. keyslots) is CCAP.CFGC + 1.
> + */
> + num_keyslots = cq_host->crypto_capabilities.config_count + 1;
> +
> + err = blk_ksm_init(ksm, num_keyslots);
> + if (err)
> + goto out_free_caps;
> +
> + ksm->ksm_ll_ops = cqhci_ksm_ops;
> + ksm->dev = dev;
> +
> + /* Unfortunately, CQHCI crypto only supports 32 DUN bits. */
> + ksm->max_dun_bytes_supported = 4;
> +
> + /*
> + * Cache all the crypto capabilities and advertise the supported crypto
> + * modes and data unit sizes to the block layer.
> + */
> + for (cap_idx = 0; cap_idx < cq_host->crypto_capabilities.num_crypto_cap;
> + cap_idx++) {
> + cq_host->crypto_cap_array[cap_idx].reg_val =
> + cpu_to_le32(cqhci_readl(cq_host,
> + CQHCI_CRYPTOCAP +
> + cap_idx * sizeof(__le32)));
> + blk_mode_num = cqhci_find_blk_crypto_mode(
> + cq_host->crypto_cap_array[cap_idx]);
> + if (blk_mode_num == BLK_ENCRYPTION_MODE_INVALID)
> + continue;
> + ksm->crypto_modes_supported[blk_mode_num] |=
> + cq_host->crypto_cap_array[cap_idx].sdus_mask * 512;
> + }
> +
> + /* Clear all the keyslots so that we start in a known state. */
> + for (slot = 0; slot < num_keyslots; slot++)
> + cqhci_crypto_clear_keyslot(cq_host, slot);
> +
> + /* CQHCI crypto requires the use of 128-bit task descriptors. */
> + cq_host->caps |= CQHCI_TASK_DESC_SZ_128;
> +
> + return 0;
> +
> +out_free_caps:
> + devm_kfree(dev, cq_host->crypto_cap_array);
> + cq_host->crypto_cap_array = NULL;
> +out:
> + mmc->caps2 &= ~MMC_CAP2_CRYPTO;
> + return err;
> +}
> diff --git a/drivers/mmc/host/cqhci-crypto.h b/drivers/mmc/host/cqhci-crypto.h
> new file mode 100644
> index 0000000000000..60b58ee0e6256
> --- /dev/null
> +++ b/drivers/mmc/host/cqhci-crypto.h
> @@ -0,0 +1,47 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +/*
> + * CQHCI crypto engine (inline encryption) support
> + *
> + * Copyright 2020 Google LLC
> + */
> +
> +#ifndef LINUX_MMC_CQHCI_CRYPTO_H
> +#define LINUX_MMC_CQHCI_CRYPTO_H
> +
> +#include <linux/mmc/host.h>
> +
> +#include "cqhci.h"
> +
> +#ifdef CONFIG_MMC_CRYPTO
> +
> +int cqhci_crypto_init(struct cqhci_host *host);
> +
> +/*
> + * Returns the crypto bits that should be set in bits 64-127 of the
> + * task descriptor.
> + */
> +static inline u64 cqhci_crypto_prep_task_desc(struct mmc_request *mrq)
> +{
> + if (!mrq->crypto_enabled)
> + return 0;
> +
> + return CQHCI_CRYPTO_ENABLE_BIT |
> + CQHCI_CRYPTO_KEYSLOT(mrq->crypto_key_slot) |
> + mrq->data_unit_num;
> +}
> +
> +#else /* CONFIG_MMC_CRYPTO */
> +
> +static inline int cqhci_crypto_init(struct cqhci_host *host)
> +{
> + return 0;
> +}
> +
> +static inline u64 cqhci_crypto_prep_task_desc(struct mmc_request *mrq)
> +{
> + return 0;
> +}
> +
> +#endif /* !CONFIG_MMC_CRYPTO */
> +
> +#endif /* LINUX_MMC_CQHCI_CRYPTO_H */
> diff --git a/drivers/mmc/host/cqhci.h b/drivers/mmc/host/cqhci.h
> index 89bf6adbce8ca..5c18734624fea 100644
> --- a/drivers/mmc/host/cqhci.h
> +++ b/drivers/mmc/host/cqhci.h
> @@ -22,10 +22,13 @@
>
> /* capabilities */
> #define CQHCI_CAP 0x04
> +#define CQHCI_CAP_CS 0x10000000 /* Crypto Support */
> +
> /* configuration */
> #define CQHCI_CFG 0x08
> #define CQHCI_DCMD 0x00001000
> #define CQHCI_TASK_DESC_SZ 0x00000100
> +#define CQHCI_CRYPTO_GENERAL_ENABLE 0x00000002
> #define CQHCI_ENABLE 0x00000001
>
> /* control */
> @@ -39,8 +42,11 @@
> #define CQHCI_IS_TCC BIT(1)
> #define CQHCI_IS_RED BIT(2)
> #define CQHCI_IS_TCL BIT(3)
> +#define CQHCI_IS_GCE BIT(4) /* General Crypto Error */
> +#define CQHCI_IS_ICCE BIT(5) /* Invalid Crypto Config Error */
>
> -#define CQHCI_IS_MASK (CQHCI_IS_TCC | CQHCI_IS_RED)
> +#define CQHCI_IS_MASK (CQHCI_IS_TCC | CQHCI_IS_RED | \
> + CQHCI_IS_GCE | CQHCI_IS_ICCE)
>
> /* interrupt status enable */
> #define CQHCI_ISTE 0x14
> @@ -78,6 +84,9 @@
> /* task clear */
> #define CQHCI_TCLR 0x38
>
> +/* task descriptor processing error */
> +#define CQHCI_TDPE 0x3c
> +
> /* send status config 1 */
> #define CQHCI_SSC1 0x40
> #define CQHCI_SSC1_CBC_MASK GENMASK(19, 16)
> @@ -107,6 +116,10 @@
> /* command response argument */
> #define CQHCI_CRA 0x5C
>
> +/* crypto capabilities */
> +#define CQHCI_CCAP 0x100
> +#define CQHCI_CRYPTOCAP 0x104
> +
> #define CQHCI_INT_ALL 0xF
> #define CQHCI_IC_DEFAULT_ICCTH 31
> #define CQHCI_IC_DEFAULT_ICTOVAL 1
> @@ -133,11 +146,71 @@
> #define CQHCI_CMD_TIMING(x) (((x) & 1) << 22)
> #define CQHCI_RESP_TYPE(x) (((x) & 0x3) << 23)
>
> +/* crypto task descriptor fields (for bits 64-127 of task descriptor) */
> +#define CQHCI_CRYPTO_ENABLE_BIT (1ULL << 47)
> +#define CQHCI_CRYPTO_KEYSLOT(x) ((u64)(x) << 32)
> +
> /* transfer descriptor fields */
> #define CQHCI_DAT_LENGTH(x) (((x) & 0xFFFF) << 16)
> #define CQHCI_DAT_ADDR_LO(x) (((x) & 0xFFFFFFFF) << 32)
> #define CQHCI_DAT_ADDR_HI(x) (((x) & 0xFFFFFFFF) << 0)
>
> +/* CCAP - Crypto Capability 100h */
> +union cqhci_crypto_capabilities {
> + __le32 reg_val;
> + struct {
> + u8 num_crypto_cap;
> + u8 config_count;
> + u8 reserved;
> + u8 config_array_ptr;
> + };
> +};
> +
> +enum cqhci_crypto_key_size {
> + CQHCI_CRYPTO_KEY_SIZE_INVALID = 0,
> + CQHCI_CRYPTO_KEY_SIZE_128 = 1,
> + CQHCI_CRYPTO_KEY_SIZE_192 = 2,
> + CQHCI_CRYPTO_KEY_SIZE_256 = 3,
> + CQHCI_CRYPTO_KEY_SIZE_512 = 4,
> +};
> +
> +enum cqhci_crypto_alg {
> + CQHCI_CRYPTO_ALG_AES_XTS = 0,
> + CQHCI_CRYPTO_ALG_BITLOCKER_AES_CBC = 1,
> + CQHCI_CRYPTO_ALG_AES_ECB = 2,
> + CQHCI_CRYPTO_ALG_ESSIV_AES_CBC = 3,
> +};
> +
> +/* x-CRYPTOCAP - Crypto Capability X */
> +union cqhci_crypto_cap_entry {
> + __le32 reg_val;
> + struct {
> + u8 algorithm_id;
> + u8 sdus_mask; /* Supported data unit size mask */
> + u8 key_size;
> + u8 reserved;
> + };
> +};
> +
> +#define CQHCI_CRYPTO_CONFIGURATION_ENABLE (1 << 7)
> +#define CQHCI_CRYPTO_KEY_MAX_SIZE 64
> +/* x-CRYPTOCFG - Crypto Configuration X */
> +union cqhci_crypto_cfg_entry {
> + __le32 reg_val[32];
> + struct {
> + u8 crypto_key[CQHCI_CRYPTO_KEY_MAX_SIZE];
> + /* 4KB/512 = 8 */
> + u8 data_unit_size;
> + u8 crypto_cap_idx;
> + u8 reserved_1;
> + u8 config_enable;
> + u8 reserved_multi_host;
> + u8 reserved_2;
> + u8 vsb[2];
> + u8 reserved_3[56];
> + };
> +};
> +
> struct cqhci_host_ops;
> struct mmc_host;
> struct mmc_request;
> @@ -196,6 +269,12 @@ struct cqhci_host {
> struct completion halt_comp;
> wait_queue_head_t wait_queue;
> struct cqhci_slot *slot;
> +
> +#ifdef CONFIG_MMC_CRYPTO
> + union cqhci_crypto_capabilities crypto_capabilities;
> + union cqhci_crypto_cap_entry *crypto_cap_array;
> + u32 crypto_cfg_register;
> +#endif
> };
>
> struct cqhci_host_ops {
>