[BUG] crypto: hisilicon: accessing the data mapped to streaming DMA

Jia-Ju Bai
2020-08-02T14:53:03Z

In qm_qp_ctx_cfg(), "sqc" and "aeqc" are mapped to streaming DMA:
eqc_dma = dma_map_single(..., eqc, ...);
......
aeqc_dma = dma_map_single(..., aeqc, ...);

Then "sqc" and "aeqc" are accessed at many places, such as:
eqc->base_l = cpu_to_le32(lower_32_bits(qm->eqe_dma));
eqc->base_h = cpu_to_le32(upper_32_bits(qm->eqe_dma));
......
aeqc->base_l = cpu_to_le32(lower_32_bits(qm->aeqe_dma));
aeqc->base_h = cpu_to_le32(upper_32_bits(qm->aeqe_dma));

These accesses may cause data inconsistency between CPU cache and hardware.

I am not sure how to properly fix this problem, and thus I only report it.

Best wishes,
Jia-Ju Bai