diff options
Diffstat (limited to 'drivers/crypto/ccp/ccp-dev.c')
| -rw-r--r-- | drivers/crypto/ccp/ccp-dev.c | 113 |
1 files changed, 109 insertions, 4 deletions
diff --git a/drivers/crypto/ccp/ccp-dev.c b/drivers/crypto/ccp/ccp-dev.c index 87b9f2bfa623..cafa633aae10 100644 --- a/drivers/crypto/ccp/ccp-dev.c +++ b/drivers/crypto/ccp/ccp-dev.c @@ -4,6 +4,7 @@ * Copyright (C) 2013,2016 Advanced Micro Devices, Inc. * * Author: Tom Lendacky <thomas.lendacky@amd.com> + * Author: Gary R Hook <gary.hook@amd.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as @@ -39,6 +40,59 @@ struct ccp_tasklet_data { struct ccp_cmd *cmd; }; +/* Human-readable error strings */ +char *ccp_error_codes[] = { + "", + "ERR 01: ILLEGAL_ENGINE", + "ERR 02: ILLEGAL_KEY_ID", + "ERR 03: ILLEGAL_FUNCTION_TYPE", + "ERR 04: ILLEGAL_FUNCTION_MODE", + "ERR 05: ILLEGAL_FUNCTION_ENCRYPT", + "ERR 06: ILLEGAL_FUNCTION_SIZE", + "ERR 07: Zlib_MISSING_INIT_EOM", + "ERR 08: ILLEGAL_FUNCTION_RSVD", + "ERR 09: ILLEGAL_BUFFER_LENGTH", + "ERR 10: VLSB_FAULT", + "ERR 11: ILLEGAL_MEM_ADDR", + "ERR 12: ILLEGAL_MEM_SEL", + "ERR 13: ILLEGAL_CONTEXT_ID", + "ERR 14: ILLEGAL_KEY_ADDR", + "ERR 15: 0xF Reserved", + "ERR 16: Zlib_ILLEGAL_MULTI_QUEUE", + "ERR 17: Zlib_ILLEGAL_JOBID_CHANGE", + "ERR 18: CMD_TIMEOUT", + "ERR 19: IDMA0_AXI_SLVERR", + "ERR 20: IDMA0_AXI_DECERR", + "ERR 21: 0x15 Reserved", + "ERR 22: IDMA1_AXI_SLAVE_FAULT", + "ERR 23: IDMA1_AIXI_DECERR", + "ERR 24: 0x18 Reserved", + "ERR 25: ZLIBVHB_AXI_SLVERR", + "ERR 26: ZLIBVHB_AXI_DECERR", + "ERR 27: 0x1B Reserved", + "ERR 27: ZLIB_UNEXPECTED_EOM", + "ERR 27: ZLIB_EXTRA_DATA", + "ERR 30: ZLIB_BTYPE", + "ERR 31: ZLIB_UNDEFINED_SYMBOL", + "ERR 32: ZLIB_UNDEFINED_DISTANCE_S", + "ERR 33: ZLIB_CODE_LENGTH_SYMBOL", + "ERR 34: ZLIB _VHB_ILLEGAL_FETCH", + "ERR 35: ZLIB_UNCOMPRESSED_LEN", + "ERR 36: ZLIB_LIMIT_REACHED", + "ERR 37: ZLIB_CHECKSUM_MISMATCH0", + "ERR 38: ODMA0_AXI_SLVERR", + "ERR 39: ODMA0_AXI_DECERR", + "ERR 40: 0x28 Reserved", + "ERR 41: ODMA1_AXI_SLVERR", + "ERR 42: ODMA1_AXI_DECERR", + "ERR 43: LSB_PARITY_ERR", +}; + +void ccp_log_error(struct ccp_device *d, int e) +{ + dev_err(d->dev, "CCP error: %s (0x%x)\n", ccp_error_codes[e], e); +} + /* List of CCPs, CCP count, read-write access lock, and access functions * * Lock structure: get ccp_unit_lock for reading whenever we need to @@ -58,7 +112,7 @@ static struct ccp_device *ccp_rr; /* Ever-increasing value to produce unique unit numbers */ static atomic_t ccp_unit_ordinal; -unsigned int ccp_increment_unit_ordinal(void) +static unsigned int ccp_increment_unit_ordinal(void) { return atomic_inc_return(&ccp_unit_ordinal); } @@ -118,6 +172,29 @@ void ccp_del_device(struct ccp_device *ccp) write_unlock_irqrestore(&ccp_unit_lock, flags); } + + +int ccp_register_rng(struct ccp_device *ccp) +{ + int ret = 0; + + dev_dbg(ccp->dev, "Registering RNG...\n"); + /* Register an RNG */ + ccp->hwrng.name = ccp->rngname; + ccp->hwrng.read = ccp_trng_read; + ret = hwrng_register(&ccp->hwrng); + if (ret) + dev_err(ccp->dev, "error registering hwrng (%d)\n", ret); + + return ret; +} + +void ccp_unregister_rng(struct ccp_device *ccp) +{ + if (ccp->hwrng.name) + hwrng_unregister(&ccp->hwrng); +} + static struct ccp_device *ccp_get_device(void) { unsigned long flags; @@ -397,9 +474,9 @@ struct ccp_device *ccp_alloc_struct(struct device *dev) spin_lock_init(&ccp->cmd_lock); mutex_init(&ccp->req_mutex); - mutex_init(&ccp->ksb_mutex); - ccp->ksb_count = KSB_COUNT; - ccp->ksb_start = 0; + mutex_init(&ccp->sb_mutex); + ccp->sb_count = KSB_COUNT; + ccp->sb_start = 0; ccp->ord = ccp_increment_unit_ordinal(); snprintf(ccp->name, MAX_CCP_NAME_LEN, "ccp-%u", ccp->ord); @@ -408,6 +485,34 @@ struct ccp_device *ccp_alloc_struct(struct device *dev) return ccp; } +int ccp_trng_read(struct hwrng *rng, void *data, size_t max, bool wait) +{ + struct ccp_device *ccp = container_of(rng, struct ccp_device, hwrng); + u32 trng_value; + int len = min_t(int, sizeof(trng_value), max); + + /* Locking is provided by the caller so we can update device + * hwrng-related fields safely + */ + trng_value = ioread32(ccp->io_regs + TRNG_OUT_REG); + if (!trng_value) { + /* Zero is returned if not data is available or if a + * bad-entropy error is present. Assume an error if + * we exceed TRNG_RETRIES reads of zero. + */ + if (ccp->hwrng_retries++ > TRNG_RETRIES) + return -EIO; + + return 0; + } + + /* Reset the counter and save the rng value */ + ccp->hwrng_retries = 0; + memcpy(data, &trng_value, len); + + return len; +} + #ifdef CONFIG_PM bool ccp_queues_suspended(struct ccp_device *ccp) { |