instmem/gk20a: use DMA attributes

instmem for GK20A is allocated using dma_alloc_coherent(), which
provides us with a coherent CPU mapping that we never use because
instmem objects are accessed through PRAMIN. Switch to
dma_alloc_attrs() which gives us the option to dismiss that CPU mapping
and free up some CPU virtual space.

Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

1 files changed, 31 insertions, 0 deletions

diff --git a/lib/include/nvif/os.h b/lib/include/nvif/os.h
index f6391a58f..b4d307e3a 100644
--- a/lib/include/nvif/os.h
+++ b/lib/include/nvif/os.h
@@ -683,6 +683,37 @@ dma_free_coherent(struct device *dev, size_t sz, void *vaddr, dma_addr_t bus)
 {
 }
 
+enum dma_attr {
+	DMA_ATTR_WRITE_BARRIER,
+	DMA_ATTR_WEAK_ORDERING,
+	DMA_ATTR_WRITE_COMBINE,
+	DMA_ATTR_NON_CONSISTENT,
+	DMA_ATTR_NO_KERNEL_MAPPING,
+	DMA_ATTR_SKIP_CPU_SYNC,
+	DMA_ATTR_FORCE_CONTIGUOUS,
+	DMA_ATTR_MAX,
+};
+
+struct dma_attrs {
+};
+
+static inline void init_dma_attrs(struct dma_attrs *attrs) {}
+static inline void dma_set_attr(enum dma_attr attr, struct dma_attrs *attrs) {}
+
+static inline void *
+dma_alloc_attrs(struct device *dev, size_t sz, dma_addr_t *hdl, gfp_t gfp,
+		struct dma_attrs *attrs)
+{
+	return NULL;
+}
+
+static inline void
+dma_free_attrs(struct device *dev, size_t sz, void *vaddr, dma_addr_t bus,
+	       struct dma_attrs *attrs)
+{
+}
+
+
 /******************************************************************************
  * PCI
  *****************************************************************************/