[SPARC64]: Respect gfp_t argument to dma_alloc_coherent().

Using asm-generic/dma-mapping.h does not work because pushing
the call down to pci_alloc_coherent() causes the gfp_t argument
of dma_alloc_coherent() to be ignored.

Fix this by implementing things directly, and adding a gfp_t
argument we can use in the internal call down to the PCI DMA
implementation of pci_alloc_coherent().

This fixes massive memory corruption when using the sound driver
layer, which passes things like __GFP_COMP down into these
routines and (correctly) expects that to work.

Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 142 insertions, 3 deletions

diff --git a/include/asm-sparc64/dma-mapping.h b/include/asm-sparc64/dma-mapping.h
index c7d5804ba76d..a8d39f23d43b 100644
--- a/include/asm-sparc64/dma-mapping.h
+++ b/include/asm-sparc64/dma-mapping.h
@@ -4,7 +4,146 @@
 #include <linux/config.h>
 
 #ifdef CONFIG_PCI
-#include <asm-generic/dma-mapping.h>
+
+/* we implement the API below in terms of the existing PCI one,
+ * so include it */
+#include <linux/pci.h>
+/* need struct page definitions */
+#include <linux/mm.h>
+
+static inline int
+dma_supported(struct device *dev, u64 mask)
+{
+        BUG_ON(dev->bus != &pci_bus_type);
+
+        return pci_dma_supported(to_pci_dev(dev), mask);
+}
+
+static inline int
+dma_set_mask(struct device *dev, u64 dma_mask)
+{
+        BUG_ON(dev->bus != &pci_bus_type);
+
+        return pci_set_dma_mask(to_pci_dev(dev), dma_mask);
+}
+
+static inline void *
+dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
+                   gfp_t flag)
+{
+        BUG_ON(dev->bus != &pci_bus_type);
+
+        return pci_iommu_ops->alloc_consistent(to_pci_dev(dev), size, dma_handle, flag);
+}
+
+static inline void
+dma_free_coherent(struct device *dev, size_t size, void *cpu_addr,
+                    dma_addr_t dma_handle)
+{
+        BUG_ON(dev->bus != &pci_bus_type);
+
+        pci_free_consistent(to_pci_dev(dev), size, cpu_addr, dma_handle);
+}
+
+static inline dma_addr_t
+dma_map_single(struct device *dev, void *cpu_addr, size_t size,
+               enum dma_data_direction direction)
+{
+        BUG_ON(dev->bus != &pci_bus_type);
+
+        return pci_map_single(to_pci_dev(dev), cpu_addr, size, (int)direction);
+}
+
+static inline void
+dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
+                 enum dma_data_direction direction)
+{
+        BUG_ON(dev->bus != &pci_bus_type);
+
+        pci_unmap_single(to_pci_dev(dev), dma_addr, size, (int)direction);
+}
+
+static inline dma_addr_t
+dma_map_page(struct device *dev, struct page *page,
+             unsigned long offset, size_t size,
+             enum dma_data_direction direction)
+{
+        BUG_ON(dev->bus != &pci_bus_type);
+
+        return pci_map_page(to_pci_dev(dev), page, offset, size, (int)direction);
+}
+
+static inline void
+dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
+               enum dma_data_direction direction)
+{
+        BUG_ON(dev->bus != &pci_bus_type);
+
+        pci_unmap_page(to_pci_dev(dev), dma_address, size, (int)direction);
+}
+
+static inline int
+dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
+           enum dma_data_direction direction)
+{
+        BUG_ON(dev->bus != &pci_bus_type);
+
+        return pci_map_sg(to_pci_dev(dev), sg, nents, (int)direction);
+}
+
+static inline void
+dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
+             enum dma_data_direction direction)
+{
+        BUG_ON(dev->bus != &pci_bus_type);
+
+        pci_unmap_sg(to_pci_dev(dev), sg, nhwentries, (int)direction);
+}
+
+static inline void
+dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size,
+                        enum dma_data_direction direction)
+{
+        BUG_ON(dev->bus != &pci_bus_type);
+
+        pci_dma_sync_single_for_cpu(to_pci_dev(dev), dma_handle,
+                                    size, (int)direction);
+}
+
+static inline void
+dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, size_t size,
+                           enum dma_data_direction direction)
+{
+        BUG_ON(dev->bus != &pci_bus_type);
+
+        pci_dma_sync_single_for_device(to_pci_dev(dev), dma_handle,
+                                       size, (int)direction);
+}
+
+static inline void
+dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
+                    enum dma_data_direction direction)
+{
+        BUG_ON(dev->bus != &pci_bus_type);
+
+        pci_dma_sync_sg_for_cpu(to_pci_dev(dev), sg, nelems, (int)direction);
+}
+
+static inline void
+dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
+                       enum dma_data_direction direction)
+{
+        BUG_ON(dev->bus != &pci_bus_type);
+
+        pci_dma_sync_sg_for_device(to_pci_dev(dev), sg, nelems, (int)direction);
+}
+
+static inline int
+dma_mapping_error(dma_addr_t dma_addr)
+{
+        return pci_dma_mapping_error(dma_addr);
+}
+
 #else
 
 struct device;
diff --git a/include/asm-sparc64/pci.h b/include/asm-sparc64/pci.h
index 7c5a589ea437..e1ea67bc32f2 100644
--- a/include/asm-sparc64/pci.h
+++ b/include/asm-sparc64/pci.h
@@ -42,7 +42,7 @@ static inline void pcibios_penalize_isa_irq(int irq, int active)
 struct pci_dev;
 
 struct pci_iommu_ops {
-        void *(*alloc_consistent)(struct pci_dev *, size_t, dma_addr_t *);
+        void *(*alloc_consistent)(struct pci_dev *, size_t, dma_addr_t *, gfp_t);
         void (*free_consistent)(struct pci_dev *, size_t, void *, dma_addr_t);
         dma_addr_t (*map_single)(struct pci_dev *, void *, size_t, int);
         void (*unmap_single)(struct pci_dev *, dma_addr_t, size_t, int);
@@ -59,7 +59,7 @@ extern struct pci_iommu_ops *pci_iommu_ops;
  */
 static inline void *pci_alloc_consistent(struct pci_dev *hwdev, size_t size, dma_addr_t *dma_handle)
 {
-        return pci_iommu_ops->alloc_consistent(hwdev, size, dma_handle);
+        return pci_iommu_ops->alloc_consistent(hwdev, size, dma_handle, GFP_ATOMIC);
 }
 
 /* Free and unmap a consistent DMA buffer.