dma-mapping: explicitly wire up ->mmap and ->get_sgtable

While the default ->mmap and ->get_sgtable implementations work for the
majority of our dma_map_ops impementations they are inherently safe
for others that don't use the page allocator or CMA and/or use their
own way of remapping not covered by the common code.  So remove the
defaults if these methods are not wired up, but instead wire up the
default implementations for all safe instances.

Fixes: e1c7e324539a ("dma-mapping: always provide the dma_map_ops based implementation")
Signed-off-by: Christoph Hellwig <hch@lst.de>

15 files changed, 42 insertions, 8 deletions

diff --git a/arch/alpha/kernel/pci_iommu.c b/arch/alpha/kernel/pci_iommu.c
index 242108439f42..7f1925a32c99 100644
--- a/arch/alpha/kernel/pci_iommu.c
+++ b/arch/alpha/kernel/pci_iommu.c
@@ -955,5 +955,7 @@ const struct dma_map_ops alpha_pci_ops = {
         .map_sg                 = alpha_pci_map_sg,
         .unmap_sg               = alpha_pci_unmap_sg,
         .dma_supported          = alpha_pci_supported,
+        .mmap                   = dma_common_mmap,
+        .get_sgtable            = dma_common_get_sgtable,
 };
 EXPORT_SYMBOL(alpha_pci_ops);
diff --git a/arch/ia64/hp/common/sba_iommu.c b/arch/ia64/hp/common/sba_iommu.c
index 3d24cc43385b..4c0ea6c2833d 100644
--- a/arch/ia64/hp/common/sba_iommu.c
+++ b/arch/ia64/hp/common/sba_iommu.c
@@ -2183,6 +2183,8 @@ const struct dma_map_ops sba_dma_ops = {
         .map_sg                 = sba_map_sg_attrs,
         .unmap_sg               = sba_unmap_sg_attrs,
         .dma_supported          = sba_dma_supported,
+        .mmap                   = dma_common_mmap,
+        .get_sgtable            = dma_common_get_sgtable,
 };
 
 void sba_dma_init(void)
diff --git a/arch/ia64/sn/pci/pci_dma.c b/arch/ia64/sn/pci/pci_dma.c
index b7d42e4edc1f..12ffb9c0d738 100644
--- a/arch/ia64/sn/pci/pci_dma.c
+++ b/arch/ia64/sn/pci/pci_dma.c
@@ -438,6 +438,8 @@ static struct dma_map_ops sn_dma_ops = {
         .unmap_sg               = sn_dma_unmap_sg,
         .dma_supported          = sn_dma_supported,
         .get_required_mask      = sn_dma_get_required_mask,
+        .mmap                   = dma_common_mmap,
+        .get_sgtable            = dma_common_get_sgtable,
 };
 
 void sn_dma_init(void)
diff --git a/arch/mips/jazz/jazzdma.c b/arch/mips/jazz/jazzdma.c
index 1804dc9d8136..a01e14955187 100644
--- a/arch/mips/jazz/jazzdma.c
+++ b/arch/mips/jazz/jazzdma.c
@@ -682,5 +682,7 @@ const struct dma_map_ops jazz_dma_ops = {
         .sync_sg_for_device     = jazz_dma_sync_sg_for_device,
         .dma_supported          = dma_direct_supported,
         .cache_sync             = arch_dma_cache_sync,
+        .mmap                   = dma_common_mmap,
+        .get_sgtable            = dma_common_get_sgtable,
 };
 EXPORT_SYMBOL(jazz_dma_ops);
diff --git a/arch/powerpc/kernel/dma-iommu.c b/arch/powerpc/kernel/dma-iommu.c
index a0879674a9c8..2f5a53874f6d 100644
--- a/arch/powerpc/kernel/dma-iommu.c
+++ b/arch/powerpc/kernel/dma-iommu.c
@@ -208,4 +208,6 @@ const struct dma_map_ops dma_iommu_ops = {
         .sync_single_for_device = dma_iommu_sync_for_device,
         .sync_sg_for_cpu        = dma_iommu_sync_sg_for_cpu,
         .sync_sg_for_device     = dma_iommu_sync_sg_for_device,
+        .mmap                   = dma_common_mmap,
+        .get_sgtable            = dma_common_get_sgtable,
 };
diff --git a/arch/powerpc/platforms/ps3/system-bus.c b/arch/powerpc/platforms/ps3/system-bus.c
index 98410119c47b..70fcc9736a8c 100644
--- a/arch/powerpc/platforms/ps3/system-bus.c
+++ b/arch/powerpc/platforms/ps3/system-bus.c
@@ -700,6 +700,8 @@ static const struct dma_map_ops ps3_sb_dma_ops = {
         .get_required_mask = ps3_dma_get_required_mask,
         .map_page = ps3_sb_map_page,
         .unmap_page = ps3_unmap_page,
+        .mmap = dma_common_mmap,
+        .get_sgtable = dma_common_get_sgtable,
 };
 
 static const struct dma_map_ops ps3_ioc0_dma_ops = {
@@ -711,6 +713,8 @@ static const struct dma_map_ops ps3_ioc0_dma_ops = {
         .get_required_mask = ps3_dma_get_required_mask,
         .map_page = ps3_ioc0_map_page,
         .unmap_page = ps3_unmap_page,
+        .mmap = dma_common_mmap,
+        .get_sgtable = dma_common_get_sgtable,
 };
 
 /**
diff --git a/arch/powerpc/platforms/pseries/vio.c b/arch/powerpc/platforms/pseries/vio.c
index 6601b9d404dc..3473eef7628c 100644
--- a/arch/powerpc/platforms/pseries/vio.c
+++ b/arch/powerpc/platforms/pseries/vio.c
@@ -605,6 +605,8 @@ static const struct dma_map_ops vio_dma_mapping_ops = {
         .unmap_page        = vio_dma_iommu_unmap_page,
         .dma_supported     = dma_iommu_dma_supported,
         .get_required_mask = dma_iommu_get_required_mask,
+        .mmap              = dma_common_mmap,
+        .get_sgtable       = dma_common_get_sgtable,
 };
 
 /**
diff --git a/arch/s390/pci/pci_dma.c b/arch/s390/pci/pci_dma.c
index 9e52d1527f71..03d8c1c9f82f 100644
--- a/arch/s390/pci/pci_dma.c
+++ b/arch/s390/pci/pci_dma.c
@@ -668,6 +668,8 @@ const struct dma_map_ops s390_pci_dma_ops = {
         .unmap_sg       = s390_dma_unmap_sg,
         .map_page       = s390_dma_map_pages,
         .unmap_page     = s390_dma_unmap_pages,
+        .mmap           = dma_common_mmap,
+        .get_sgtable    = dma_common_get_sgtable,
         /* dma_supported is unconditionally true without a callback */
 };
 EXPORT_SYMBOL_GPL(s390_pci_dma_ops);
diff --git a/arch/x86/kernel/amd_gart_64.c b/arch/x86/kernel/amd_gart_64.c
index a585ea6f686a..f72c487d68a8 100644
--- a/arch/x86/kernel/amd_gart_64.c
+++ b/arch/x86/kernel/amd_gart_64.c
@@ -677,6 +677,8 @@ static const struct dma_map_ops gart_dma_ops = {
         .unmap_page                     = gart_unmap_page,
         .alloc                          = gart_alloc_coherent,
         .free                           = gart_free_coherent,
+        .mmap                           = dma_common_mmap,
+        .get_sgtable                    = dma_common_get_sgtable,
         .dma_supported                  = dma_direct_supported,
 };
 
diff --git a/arch/x86/kernel/pci-calgary_64.c b/arch/x86/kernel/pci-calgary_64.c
index 9d4343aa481b..23fdec030c37 100644
--- a/arch/x86/kernel/pci-calgary_64.c
+++ b/arch/x86/kernel/pci-calgary_64.c
@@ -468,6 +468,8 @@ static const struct dma_map_ops calgary_dma_ops = {
         .map_page = calgary_map_page,
         .unmap_page = calgary_unmap_page,
         .dma_supported = dma_direct_supported,
+        .mmap = dma_common_mmap,
+        .get_sgtable = dma_common_get_sgtable,
 };
 
 static inline void __iomem * busno_to_bbar(unsigned char num)
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index b607a92791d3..2e74ad659985 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -2722,6 +2722,8 @@ static const struct dma_map_ops amd_iommu_dma_ops = {
         .map_sg         = map_sg,
         .unmap_sg       = unmap_sg,
         .dma_supported  = amd_iommu_dma_supported,
+        .mmap           = dma_common_mmap,
+        .get_sgtable    = dma_common_get_sgtable,
 };
 
 static int init_reserved_iova_ranges(void)
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 12d094d08c0a..dca1b06ce4ec 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -3738,6 +3738,8 @@ static const struct dma_map_ops intel_dma_ops = {
         .map_resource = intel_map_resource,
         .unmap_resource = intel_unmap_resource,
         .dma_supported = dma_direct_supported,
+        .mmap = dma_common_mmap,
+        .get_sgtable = dma_common_get_sgtable,
 };
 
 static inline int iommu_domain_cache_init(void)
diff --git a/drivers/parisc/ccio-dma.c b/drivers/parisc/ccio-dma.c
index 217f15aafa4a..1d7125d29bee 100644
--- a/drivers/parisc/ccio-dma.c
+++ b/drivers/parisc/ccio-dma.c
@@ -1024,6 +1024,8 @@ static const struct dma_map_ops ccio_ops = {
         .unmap_page =           ccio_unmap_page,
         .map_sg =               ccio_map_sg,
         .unmap_sg =             ccio_unmap_sg,
+        .mmap =                 dma_common_mmap,
+        .get_sgtable =          dma_common_get_sgtable,
 };
 
 #ifdef CONFIG_PROC_FS
diff --git a/drivers/parisc/sba_iommu.c b/drivers/parisc/sba_iommu.c
index 296668caf7e5..fa4df65b7e28 100644
--- a/drivers/parisc/sba_iommu.c
+++ b/drivers/parisc/sba_iommu.c
@@ -1084,6 +1084,8 @@ static const struct dma_map_ops sba_ops = {
         .unmap_page =           sba_unmap_page,
         .map_sg =               sba_map_sg,
         .unmap_sg =             sba_unmap_sg,
+        .mmap =                 dma_common_mmap,
+        .get_sgtable =          dma_common_get_sgtable,
 };
 
 
diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c
index a136932b8e6d..c8b4e46407ba 100644
--- a/kernel/dma/mapping.c
+++ b/kernel/dma/mapping.c
@@ -153,11 +153,12 @@ int dma_get_sgtable_attrs(struct device *dev, struct sg_table *sgt,
 {
         const struct dma_map_ops *ops = get_dma_ops(dev);
 
-        if (!dma_is_direct(ops) && ops->get_sgtable)
-                return ops->get_sgtable(dev, sgt, cpu_addr, dma_addr, size,
-                                        attrs);
-        return dma_common_get_sgtable(dev, sgt, cpu_addr, dma_addr, size,
-                        attrs);
+        if (dma_is_direct(ops))
+                return dma_common_get_sgtable(dev, sgt, cpu_addr, dma_addr,
+                                size, attrs);
+        if (!ops->get_sgtable)
+                return -ENXIO;
+        return ops->get_sgtable(dev, sgt, cpu_addr, dma_addr, size, attrs);
 }
 EXPORT_SYMBOL(dma_get_sgtable_attrs);
 
@@ -240,9 +241,12 @@ int dma_mmap_attrs(struct device *dev, struct vm_area_struct *vma,
 {
         const struct dma_map_ops *ops = get_dma_ops(dev);
 
-        if (!dma_is_direct(ops) && ops->mmap)
-                return ops->mmap(dev, vma, cpu_addr, dma_addr, size, attrs);
-        return dma_common_mmap(dev, vma, cpu_addr, dma_addr, size, attrs);
+        if (dma_is_direct(ops))
+                return dma_common_mmap(dev, vma, cpu_addr, dma_addr, size,
+                                attrs);
+        if (!ops->mmap)
+                return -ENXIO;
+        return ops->mmap(dev, vma, cpu_addr, dma_addr, size, attrs);
 }
 EXPORT_SYMBOL(dma_mmap_attrs);