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 allocate aligned memory to store the data passed
to/from CAAM and flush/invalidate the memory regions.
Blobs can now be encapsulated and decapsulated with the blob cmd as well
as from board code by calling blob_encap and blob_decap directly.
Tested on an i.MX6Q board.
Signed-off-by: Clemens Gruber <clemens.gru...@pqgruber.com>
---
drivers/crypto/fsl/fsl_blob.c | 99 ++++++++++++++++++++++++++++++++++++-------
1 file changed, 83 insertions(+), 16 deletions(-)
diff --git a/drivers/crypto/fsl/fsl_blob.c b/drivers/crypto/fsl/fsl_blob.c
index 38c6f9486b..65ce21f4af 100644
--- a/drivers/crypto/fsl/fsl_blob.c
+++ b/drivers/crypto/fsl/fsl_blob.c
@@ -7,6 +7,7 @@
#include <common.h>
#include <malloc.h>
+#include <memalign.h>
#include <fsl_sec.h>
#include <linux/errno.h>
#include "jobdesc.h"
@@ -15,56 +16,122 @@
int blob_decap(u8 *key_mod, u8 *src, u8 *dst, u32 len)
{
- int ret, i = 0;
+ ALLOC_CACHE_ALIGN_BUFFER(u8, aligned_key_mod, 16);
+ u8 *aligned_src, *aligned_dst;
+ int ret, size, i = 0;
u32 *desc;
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;
}
- inline_cnstr_jobdesc_blob_decap(desc, key_mod, src, dst, len);
+ aligned_src = malloc_cache_aligned(BLOB_SIZE(len));
+ aligned_dst = malloc_cache_aligned(len);
+ if (!aligned_src || !aligned_dst) {
+ debug("Not enough memory for blob allocations\n");
+ return -ENOMEM;
+ }
+
+ memcpy(aligned_key_mod, key_mod, 16);
+ size = ALIGN(16, ARCH_DMA_MINALIGN);
+ flush_dcache_range((unsigned long)aligned_key_mod,
+ (unsigned long)aligned_key_mod + size);
+
+ memcpy(aligned_src, src, BLOB_SIZE(len));
+ size = ALIGN(BLOB_SIZE(len), ARCH_DMA_MINALIGN);
+ flush_dcache_range((unsigned long)aligned_src,
+ (unsigned long)aligned_src + size);
+
+ inline_cnstr_jobdesc_blob_decap(desc, aligned_key_mod, aligned_src,
+ aligned_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)aligned_dst,
+ (unsigned long)aligned_dst + size);
+ memcpy(dst, aligned_dst, len);
+
+ puts("Blob decapsulation successful.\n");
+ }
+ free(aligned_dst);
+ free(aligned_src);
free(desc);
return ret;
}
int blob_encap(u8 *key_mod, u8 *src, u8 *dst, u32 len)
{
- int ret, i = 0;
+ ALLOC_CACHE_ALIGN_BUFFER(u8, aligned_key_mod, 16);
+ u8 *aligned_src, *aligned_dst;
+ int ret, size, i = 0;
u32 *desc;
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;
}
- inline_cnstr_jobdesc_blob_encap(desc, key_mod, src, dst, len);
+ aligned_src = malloc_cache_aligned(len);
+ aligned_dst = malloc_cache_aligned(BLOB_SIZE(len));
+ if (!aligned_src || !aligned_dst) {
+ debug("Not enough memory for blob allocations\n");
+ return -ENOMEM;
+ }
+
+ memcpy(aligned_key_mod, key_mod, 16);
+ size = ALIGN(16, ARCH_DMA_MINALIGN);
+ flush_dcache_range((unsigned long)aligned_key_mod,
+ (unsigned long)aligned_key_mod + size);
+
+ memcpy(aligned_src, src, len);
+ size = ALIGN(len, ARCH_DMA_MINALIGN);
+ flush_dcache_range((unsigned long)aligned_src,
+ (unsigned long)aligned_src + size);
+
+ inline_cnstr_jobdesc_blob_encap(desc, aligned_key_mod, aligned_src,
+ aligned_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)aligned_dst,
+ (unsigned long)aligned_dst + size);
+ memcpy(dst, aligned_dst, BLOB_SIZE(len));
+
+ puts("Blob encapsulation successful.\n");
+ }
+ free(aligned_dst);
+ free(aligned_src);
free(desc);
return ret;
}
--
2.15.1
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