[PATCH] 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.

This is a disk eater when sound is used, so it's pretty critical.

Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/arch/sparc64/kernel/pci_iommu.c b/arch/sparc64/kernel/pci_iommu.c
index a11910be1013d82a7737a148d5698d6e476318f7..f63f0653dd0e84b8be2dec9d7f31205d74c9a9e9 100644 (file)
--- a/arch/sparc64/kernel/pci_iommu.c
+++ b/arch/sparc64/kernel/pci_iommu.c
@@ -219,7 +219,7 @@ static inline void iommu_free_ctx(struct pci_iommu *iommu, int ctx)
  * DMA for PCI device PDEV.  Return non-NULL cpu-side address if
  * successful and set *DMA_ADDRP to the PCI side dma address.
  */
-void *pci_alloc_consistent(struct pci_dev *pdev, size_t size, dma_addr_t *dma_addrp)
+void *__pci_alloc_consistent(struct pci_dev *pdev, size_t size, dma_addr_t *dma_addrp, gfp_t gfp)
 {
        struct pcidev_cookie *pcp;
        struct pci_iommu *iommu;
@@ -233,7 +233,7 @@ void *pci_alloc_consistent(struct pci_dev *pdev, size_t size, dma_addr_t *dma_ad
        if (order >= 10)
                return NULL;
 
-       first_page = __get_free_pages(GFP_ATOMIC, order);
+       first_page = __get_free_pages(gfp, order);
        if (first_page == 0UL)
                return NULL;
        memset((char *)first_page, 0, PAGE_SIZE << order);

diff --git a/arch/sparc64/kernel/sparc64_ksyms.c b/arch/sparc64/kernel/sparc64_ksyms.c
index 3c06bfb92a8c81b40236eb8fb678474875d1e012..a6fe4f34aa6b517ee6cd2c93969a2a5d8d55ce4d 100644 (file)
--- a/arch/sparc64/kernel/sparc64_ksyms.c
+++ b/arch/sparc64/kernel/sparc64_ksyms.c
@@ -221,7 +221,7 @@ EXPORT_SYMBOL(insl);
 EXPORT_SYMBOL(ebus_chain);
 EXPORT_SYMBOL(isa_chain);
 EXPORT_SYMBOL(pci_memspace_mask);
-EXPORT_SYMBOL(pci_alloc_consistent);
+EXPORT_SYMBOL(__pci_alloc_consistent);
 EXPORT_SYMBOL(pci_free_consistent);
 EXPORT_SYMBOL(pci_map_single);
 EXPORT_SYMBOL(pci_unmap_single);

diff --git a/include/asm-sparc64/dma-mapping.h b/include/asm-sparc64/dma-mapping.h
index c7d5804ba76df1a1e458746cea57a828cbe93ac2..a587fd7268f775dfd48c77c4e3164fbd2a02e845 100644 (file)
--- 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_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 89bd71b1c0d80c869791bec7f267cff7109f4114..5b12c2ad1d436c1e150d5208007ece6dcf6b7c40 100644 (file)
--- a/include/asm-sparc64/pci.h
+++ b/include/asm-sparc64/pci.h
@@ -44,7 +44,9 @@ struct pci_dev;
 /* Allocate and map kernel buffer using consistent mode DMA for a device.
  * hwdev should be valid struct pci_dev pointer for PCI devices.
  */
-extern void *pci_alloc_consistent(struct pci_dev *hwdev, size_t size, dma_addr_t *dma_handle);
+extern void *__pci_alloc_consistent(struct pci_dev *hwdev, size_t size, dma_addr_t *dma_handle, gfp_t gfp);
+#define pci_alloc_consistent(DEV,SZ,HANDLE) \
+       __pci_alloc_consistent(DEV,SZ,HANDLE,GFP_ATOMIC)
 
 /* Free and unmap a consistent DMA buffer.
  * cpu_addr is what was returned from pci_alloc_consistent,