| Message ID | 20161025153709.4815.82720.stgit@ahduyck-blue-test.jf.intel.com |
|---|---|
| State | New |
| Headers | show |
On 10/25/2016 02:38 PM, Alexander Duyck wrote: > This change allows us to pass DMA_ATTR_SKIP_CPU_SYNC which allows us to > avoid invoking cache line invalidation if the driver will just handle it > later via a sync_for_cpu or sync_for_device call. > > Cc: Vineet Gupta <vgupta@synopsys.com> > Cc: linux-snps-arc@lists.infradead.org > Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com> > --- > arch/arc/mm/dma.c | 5 ++++- Acked-by: Vineet Gupta <vgupta@synopsys.com> > 1 file changed, 4 insertions(+), 1 deletion(-) > > diff --git a/arch/arc/mm/dma.c b/arch/arc/mm/dma.c > index 20afc65..6303c34 100644 > --- a/arch/arc/mm/dma.c > +++ b/arch/arc/mm/dma.c > @@ -133,7 +133,10 @@ static dma_addr_t arc_dma_map_page(struct device *dev, struct page *page, > unsigned long attrs) > { > phys_addr_t paddr = page_to_phys(page) + offset; > - _dma_cache_sync(paddr, size, dir); > + > + if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC)) > + _dma_cache_sync(paddr, size, dir); > + > return plat_phys_to_dma(dev, paddr); > } > > >
diff --git a/arch/arc/mm/dma.c b/arch/arc/mm/dma.c index 20afc65..6303c34 100644 --- a/arch/arc/mm/dma.c +++ b/arch/arc/mm/dma.c @@ -133,7 +133,10 @@ static dma_addr_t arc_dma_map_page(struct device *dev, struct page *page, unsigned long attrs) { phys_addr_t paddr = page_to_phys(page) + offset; - _dma_cache_sync(paddr, size, dir); + + if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC)) + _dma_cache_sync(paddr, size, dir); + return plat_phys_to_dma(dev, paddr); }
This change allows us to pass DMA_ATTR_SKIP_CPU_SYNC which allows us to avoid invoking cache line invalidation if the driver will just handle it later via a sync_for_cpu or sync_for_device call. Cc: Vineet Gupta <vgupta@synopsys.com> Cc: linux-snps-arc@lists.infradead.org Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com> --- arch/arc/mm/dma.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)