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mbedtls aes dma: Fix bug where DMA would complete when the first output descriptor was done, not the last

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This commit is contained in:
Angus Gratton 2021-02-04 16:18:13 +11:00
parent 718f296587
commit e6b8bc6ecb
1 changed files with 9 additions and 4 deletions
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13
components/mbedtls/port/aes/dma/esp_aes.c
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@ -291,7 +291,8 @@ static int esp_aes_process_dma(esp_aes_context *ctx, const unsigned char *input,
{
lldesc_t stream_in_desc, stream_out_desc;
lldesc_t *in_desc_head = NULL, *out_desc_head = NULL;
lldesc_t *block_desc = NULL, *block_in_desc, *block_out_desc;
lldesc_t *out_desc_tail = NULL; /* pointer to the final output descriptor */
lldesc_t *block_desc = NULL, *block_in_desc = NULL, *block_out_desc = NULL;
size_t lldesc_num;
uint8_t stream_in[16] = {};
unsigned stream_bytes = len % AES_BLOCK_BYTES; // bytes which aren't in a full block
@ -357,8 +358,10 @@ static int esp_aes_process_dma(esp_aes_context *ctx, const unsigned char *input,
block_in_desc = block_desc;
block_out_desc = block_desc + lldesc_num;
lldesc_setup_link(block_desc, input, block_bytes, 0);
lldesc_setup_link(block_desc + lldesc_num, output, block_bytes, 0);
lldesc_setup_link(block_in_desc, input, block_bytes, 0);
lldesc_setup_link(block_out_desc, output, block_bytes, 0);
out_desc_tail = &block_out_desc[lldesc_num - 1];
}
/* Any leftover bytes which are appended as an additional DMA list */
@ -373,6 +376,8 @@ static int esp_aes_process_dma(esp_aes_context *ctx, const unsigned char *input,
block_in_desc[lldesc_num - 1].empty = (uint32_t)&stream_in_desc;
block_out_desc[lldesc_num - 1].empty = (uint32_t)&stream_out_desc;
}
out_desc_tail = &stream_out_desc;
}
// block buffers are sent to DMA first, unless there aren't any
@ -401,7 +406,7 @@ static int esp_aes_process_dma(esp_aes_context *ctx, const unsigned char *input,
}
aes_hal_transform_dma_start(blocks);
esp_aes_dma_wait_complete(use_intr, out_desc_head);
esp_aes_dma_wait_complete(use_intr, out_desc_tail);
#if (CONFIG_SPIRAM_USE_CAPS_ALLOC || CONFIG_SPIRAM_USE_MALLOC)
if (block_bytes > 0) {