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crypto/fsl: fix BLOB encapsulation and decapsulation

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The blob_encap and blob_decap functions were not flushing the dcache
before passing data to CAAM/DMA and not invalidating the dcache when
getting data back.
Therefore, blob encapsulation and decapsulation failed with errors like
the following due to data cache incoherency:
"40000006: DECO: desc idx 0: Invalid KEY command"

To ensure coherency, we require the key_mod, src and dst buffers to be
aligned to the cache line size and flush/invalidate the memory regions.
The same requirements apply to the job descriptor.

Tested on an i.MX6Q board.

Reviewed-by: Sumit Garg <sumit.garg@nxp.com>
Signed-off-by: Clemens Gruber <clemens.gruber@pqgruber.com>
This commit is contained in:
Clemens Gruber 2018-01-07 20:26:29 +01:00 committed by Tom Rini
parent ca833ca957
commit 598e9dccc7
2 changed files with 91 additions and 16 deletions
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103
drivers/crypto/fsl/fsl_blob.c
View file

@ -7,63 +7,138 @@
#include <common.h>
#include <malloc.h>
#include <memalign.h>
#include <fsl_sec.h>
#include <linux/errno.h>
#include "jobdesc.h"
#include "desc.h"
#include "jr.h"
/**
* blob_decap() - Decapsulate the data from a blob
* @key_mod: - Key modifier address
* @src: - Source address (blob)
* @dst: - Destination address (data)
* @len: - Size of decapsulated data
*
* Note: Start and end of the key_mod, src and dst buffers have to be aligned to
* the cache line size (ARCH_DMA_MINALIGN) for the CAAM operation to succeed.
*
* Returns zero on success, negative on error.
*/
int blob_decap(u8 *key_mod, u8 *src, u8 *dst, u32 len)
{
int ret, i = 0;
int ret, size, i = 0;
u32 *desc;
if (!IS_ALIGNED((uintptr_t)key_mod, ARCH_DMA_MINALIGN) ||
!IS_ALIGNED((uintptr_t)src, ARCH_DMA_MINALIGN) ||
!IS_ALIGNED((uintptr_t)dst, ARCH_DMA_MINALIGN)) {
puts("Error: blob_decap: Address arguments are not aligned!\n");
return -EINVAL;
}
printf("\nDecapsulating blob to get data\n");
desc = malloc(sizeof(int) * MAX_CAAM_DESCSIZE);
desc = malloc_cache_aligned(sizeof(int) * MAX_CAAM_DESCSIZE);
if (!desc) {
debug("Not enough memory for descriptor allocation\n");
return -1;
return -ENOMEM;
}
size = ALIGN(16, ARCH_DMA_MINALIGN);
flush_dcache_range((unsigned long)key_mod,
(unsigned long)key_mod + size);
size = ALIGN(BLOB_SIZE(len), ARCH_DMA_MINALIGN);
flush_dcache_range((unsigned long)src,
(unsigned long)src + size);
inline_cnstr_jobdesc_blob_decap(desc, key_mod, src, dst, len);
debug("Descriptor dump:\n");
for (i = 0; i < 14; i++)
debug("Word[%d]: %08x\n", i, *(desc + i));
size = ALIGN(sizeof(int) * MAX_CAAM_DESCSIZE, ARCH_DMA_MINALIGN);
flush_dcache_range((unsigned long)desc,
(unsigned long)desc + size);
ret = run_descriptor_jr(desc);
if (ret)
printf("Error in Decapsulation %d\n", ret);
else
printf("Decapsulation Success\n");
if (ret) {
printf("Error in blob decapsulation: %d\n", ret);
} else {
size = ALIGN(len, ARCH_DMA_MINALIGN);
invalidate_dcache_range((unsigned long)dst,
(unsigned long)dst + size);
puts("Blob decapsulation successful.\n");
}
free(desc);
return ret;
}
/**
* blob_encap() - Encapsulate the data as a blob
* @key_mod: - Key modifier address
* @src: - Source address (data)
* @dst: - Destination address (blob)
* @len: - Size of data to be encapsulated
*
* Note: Start and end of the key_mod, src and dst buffers have to be aligned to
* the cache line size (ARCH_DMA_MINALIGN) for the CAAM operation to succeed.
*
* Returns zero on success, negative on error.
*/
int blob_encap(u8 *key_mod, u8 *src, u8 *dst, u32 len)
{
int ret, i = 0;
int ret, size, i = 0;
u32 *desc;
if (!IS_ALIGNED((uintptr_t)key_mod, ARCH_DMA_MINALIGN) ||
!IS_ALIGNED((uintptr_t)src, ARCH_DMA_MINALIGN) ||
!IS_ALIGNED((uintptr_t)dst, ARCH_DMA_MINALIGN)) {
puts("Error: blob_encap: Address arguments are not aligned!\n");
return -EINVAL;
}
printf("\nEncapsulating data to form blob\n");
desc = malloc(sizeof(int) * MAX_CAAM_DESCSIZE);
desc = malloc_cache_aligned(sizeof(int) * MAX_CAAM_DESCSIZE);
if (!desc) {
debug("Not enough memory for descriptor allocation\n");
return -1;
return -ENOMEM;
}
size = ALIGN(16, ARCH_DMA_MINALIGN);
flush_dcache_range((unsigned long)key_mod,
(unsigned long)key_mod + size);
size = ALIGN(len, ARCH_DMA_MINALIGN);
flush_dcache_range((unsigned long)src,
(unsigned long)src + size);
inline_cnstr_jobdesc_blob_encap(desc, key_mod, src, dst, len);
debug("Descriptor dump:\n");
for (i = 0; i < 14; i++)
debug("Word[%d]: %08x\n", i, *(desc + i));
size = ALIGN(sizeof(int) * MAX_CAAM_DESCSIZE, ARCH_DMA_MINALIGN);
flush_dcache_range((unsigned long)desc,
(unsigned long)desc + size);
ret = run_descriptor_jr(desc);
if (ret)
printf("Error in Encapsulation %d\n", ret);
else
printf("Encapsulation Success\n");
if (ret) {
printf("Error in blob encapsulation: %d\n", ret);
} else {
size = ALIGN(BLOB_SIZE(len), ARCH_DMA_MINALIGN);
invalidate_dcache_range((unsigned long)dst,
(unsigned long)dst + size);
puts("Blob encapsulation successful.\n");
}
free(desc);
return ret;

4
include/fsl_sec.h
View file

@ -215,6 +215,8 @@ struct sg_entry {
#define SG_ENTRY_OFFSET_SHIFT 0
};
#define BLOB_SIZE(x) ((x) + 32 + 16) /* Blob buffer size */
#if defined(CONFIG_MX6) || defined(CONFIG_MX7)
/* Job Ring Base Address */
#define JR_BASE_ADDR(x) (CONFIG_SYS_FSL_SEC_ADDR + 0x1000 * (x + 1))
@ -274,8 +276,6 @@ struct sg_entry {
#define PERM 0x0000B008 /* Clear on release, lock SMAP
* lock SMAG group 1 Blob */
#define BLOB_SIZE(x) (x + 32 + 16) /* Blob buffer size */
/* HAB WRAPPED KEY header */
#define WRP_HDR_SIZE 0x08
#define HDR_TAG 0x81