diff options
Diffstat (limited to 'arch/arc/mm/dma.c')
| -rw-r--r-- | arch/arc/mm/dma.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/arc/mm/dma.c b/arch/arc/mm/dma.c index 2cfe81dca92a..74a637a1cfc4 100644 --- a/arch/arc/mm/dma.c +++ b/arch/arc/mm/dma.c @@ -66,6 +66,18 @@ void *dma_alloc_coherent(struct device *dev, size_t size, /* This is bus address, platform dependent */ *dma_handle = (dma_addr_t)paddr; + /* + * Evict any existing L1 and/or L2 lines for the backing page + * in case it was used earlier as a normal "cached" page. + * Yeah this bit us - STAR 9000898266 + * + * Although core does call flush_cache_vmap(), it gets kvaddr hence + * can't be used to efficiently flush L1 and/or L2 which need paddr + * Currently flush_cache_vmap nukes the L1 cache completely which + * will be optimized as a separate commit + */ + dma_cache_wback_inv((unsigned long)paddr, size); + return kvaddr; } EXPORT_SYMBOL(dma_alloc_coherent); |