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mmc: cqhci: add cqhci_host_ops::program_key

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On Snapdragon SoCs, the Linux kernel isn't permitted to directly access
the standard CQHCI crypto configuration registers.  Instead, programming
and evicting keys must be done through vendor-specific SMC calls.

To support this hardware, add a ->program_key() method to
'struct cqhci_host_ops'.  This allows overriding the standard CQHCI
crypto key programming / eviction procedure.

This is inspired by the corresponding UFS crypto support, which uses
these same SMC calls.  See commit 1bc726e26e ("scsi: ufs: Add
program_key() variant op").

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/20210126001456.382989-6-ebiggers@kernel.org
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Eric Biggers 2021-01-25 16:14:52 -08:00 committed by Ulf Hansson
parent 1e80709bdb
commit 0a0c866f37
2 changed files with 17 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
drivers/mmc/host/cqhci-crypto.c
View File

@ -30,13 +30,16 @@ cqhci_host_from_ksm(struct blk_keyslot_manager *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)
static int 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;
if (cq_host->ops->program_key)
return cq_host->ops->program_key(cq_host, cfg, slot);
/* Clear CFGE */
cqhci_writel(cq_host, 0, slot_offset + 16 * sizeof(cfg->reg_val[0]));
@ -51,6 +54,7 @@ static void cqhci_crypto_program_key(struct cqhci_host *cq_host,
/* 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]));
return 0;
}
static int cqhci_crypto_keyslot_program(struct blk_keyslot_manager *ksm,
@ -67,6 +71,7 @@ static int cqhci_crypto_keyslot_program(struct blk_keyslot_manager *ksm,
int i;
int cap_idx = -1;
union cqhci_crypto_cfg_entry cfg = {};
int err;
BUILD_BUG_ON(CQHCI_CRYPTO_KEY_SIZE_INVALID != 0);
for (i = 0; i < cq_host->crypto_capabilities.num_crypto_cap; i++) {
@ -93,13 +98,13 @@ static int cqhci_crypto_keyslot_program(struct blk_keyslot_manager *ksm,
memcpy(cfg.crypto_key, key->raw, key->size);
}
cqhci_crypto_program_key(cq_host, &cfg, slot);
err = cqhci_crypto_program_key(cq_host, &cfg, slot);
memzero_explicit(&cfg, sizeof(cfg));
return 0;
return err;
}
static void cqhci_crypto_clear_keyslot(struct cqhci_host *cq_host, int slot)
static int cqhci_crypto_clear_keyslot(struct cqhci_host *cq_host, int slot)
{
/*
* Clear the crypto cfg on the device. Clearing CFGE
@ -107,7 +112,7 @@ static void cqhci_crypto_clear_keyslot(struct cqhci_host *cq_host, int slot)
*/
union cqhci_crypto_cfg_entry cfg = {};
cqhci_crypto_program_key(cq_host, &cfg, slot);
return cqhci_crypto_program_key(cq_host, &cfg, slot);
}
static int cqhci_crypto_keyslot_evict(struct blk_keyslot_manager *ksm,
@ -116,8 +121,7 @@ static int cqhci_crypto_keyslot_evict(struct blk_keyslot_manager *ksm,
{
struct cqhci_host *cq_host = cqhci_host_from_ksm(ksm);
cqhci_crypto_clear_keyslot(cq_host, slot);
return 0;
return cqhci_crypto_clear_keyslot(cq_host, slot);
}
/*

4
drivers/mmc/host/cqhci.h
View File

@ -286,6 +286,10 @@ struct cqhci_host_ops {
u64 *data);
void (*pre_enable)(struct mmc_host *mmc);
void (*post_disable)(struct mmc_host *mmc);
#ifdef CONFIG_MMC_CRYPTO
int (*program_key)(struct cqhci_host *cq_host,
const union cqhci_crypto_cfg_entry *cfg, int slot);
#endif
};
static inline void cqhci_writel(struct cqhci_host *host, u32 val, int reg)