[Xen-devel] [PATCH 20/44] sparc: implement ->mapping_error

[Christoph Hellwig <hch@xxxxxx>]

DMA_ERROR_CODE is going to go away, so don't rely on it.

Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Acked-by: David S. Miller <davem@xxxxxxxxxxxxx>
---
 arch/sparc/include/asm/dma-mapping.h |  2 --
 arch/sparc/kernel/iommu.c            | 12 +++++++++---
 arch/sparc/kernel/iommu_common.h     |  2 ++
 arch/sparc/kernel/pci_sun4v.c        | 14 ++++++++++----
 4 files changed, 21 insertions(+), 9 deletions(-)

diff --git a/arch/sparc/include/asm/dma-mapping.h 
b/arch/sparc/include/asm/dma-mapping.h
index 69cc627779f2..b8e8dfcd065d 100644
--- a/arch/sparc/include/asm/dma-mapping.h
+++ b/arch/sparc/include/asm/dma-mapping.h
@@ -5,8 +5,6 @@
 #include <linux/mm.h>
 #include <linux/dma-debug.h>
 
-#define DMA_ERROR_CODE (~(dma_addr_t)0x0)
-
 #define HAVE_ARCH_DMA_SUPPORTED 1
 int dma_supported(struct device *dev, u64 mask);
 
diff --git a/arch/sparc/kernel/iommu.c b/arch/sparc/kernel/iommu.c
index c63ba99ca551..dafa316d978d 100644
--- a/arch/sparc/kernel/iommu.c
+++ b/arch/sparc/kernel/iommu.c
@@ -314,7 +314,7 @@ static dma_addr_t dma_4u_map_page(struct device *dev, 
struct page *page,
 bad_no_ctx:
        if (printk_ratelimit())
                WARN_ON(1);
-       return DMA_ERROR_CODE;
+       return SPARC_MAPPING_ERROR;
 }
 
 static void strbuf_flush(struct strbuf *strbuf, struct iommu *iommu,
@@ -547,7 +547,7 @@ static int dma_4u_map_sg(struct device *dev, struct 
scatterlist *sglist,
 
        if (outcount < incount) {
                outs = sg_next(outs);
-               outs->dma_address = DMA_ERROR_CODE;
+               outs->dma_address = SPARC_MAPPING_ERROR;
                outs->dma_length = 0;
        }
 
@@ -573,7 +573,7 @@ static int dma_4u_map_sg(struct device *dev, struct 
scatterlist *sglist,
                        iommu_tbl_range_free(&iommu->tbl, vaddr, npages,
                                             IOMMU_ERROR_CODE);
 
-                       s->dma_address = DMA_ERROR_CODE;
+                       s->dma_address = SPARC_MAPPING_ERROR;
                        s->dma_length = 0;
                }
                if (s == outs)
@@ -741,6 +741,11 @@ static void dma_4u_sync_sg_for_cpu(struct device *dev,
        spin_unlock_irqrestore(&iommu->lock, flags);
 }
 
+static int dma_4u_mapping_error(struct device *dev, dma_addr_t dma_addr)
+{
+       return dma_addr == SPARC_MAPPING_ERROR;
+}
+
 static const struct dma_map_ops sun4u_dma_ops = {
        .alloc                  = dma_4u_alloc_coherent,
        .free                   = dma_4u_free_coherent,
@@ -750,6 +755,7 @@ static const struct dma_map_ops sun4u_dma_ops = {
        .unmap_sg               = dma_4u_unmap_sg,
        .sync_single_for_cpu    = dma_4u_sync_single_for_cpu,
        .sync_sg_for_cpu        = dma_4u_sync_sg_for_cpu,
+       .mapping_error          = dma_4u_mapping_error,
 };
 
 const struct dma_map_ops *dma_ops = &sun4u_dma_ops;
diff --git a/arch/sparc/kernel/iommu_common.h b/arch/sparc/kernel/iommu_common.h
index 828493329f68..5ea5c192b1d9 100644
--- a/arch/sparc/kernel/iommu_common.h
+++ b/arch/sparc/kernel/iommu_common.h
@@ -47,4 +47,6 @@ static inline int is_span_boundary(unsigned long entry,
        return iommu_is_span_boundary(entry, nr, shift, boundary_size);
 }
 
+#define SPARC_MAPPING_ERROR    (~(dma_addr_t)0x0)
+
 #endif /* _IOMMU_COMMON_H */
diff --git a/arch/sparc/kernel/pci_sun4v.c b/arch/sparc/kernel/pci_sun4v.c
index 68bec7c97cb8..8e2a56f4c03a 100644
--- a/arch/sparc/kernel/pci_sun4v.c
+++ b/arch/sparc/kernel/pci_sun4v.c
@@ -412,12 +412,12 @@ static dma_addr_t dma_4v_map_page(struct device *dev, 
struct page *page,
 bad:
        if (printk_ratelimit())
                WARN_ON(1);
-       return DMA_ERROR_CODE;
+       return SPARC_MAPPING_ERROR;
 
 iommu_map_fail:
        local_irq_restore(flags);
        iommu_tbl_range_free(tbl, bus_addr, npages, IOMMU_ERROR_CODE);
-       return DMA_ERROR_CODE;
+       return SPARC_MAPPING_ERROR;
 }
 
 static void dma_4v_unmap_page(struct device *dev, dma_addr_t bus_addr,
@@ -590,7 +590,7 @@ static int dma_4v_map_sg(struct device *dev, struct 
scatterlist *sglist,
 
        if (outcount < incount) {
                outs = sg_next(outs);
-               outs->dma_address = DMA_ERROR_CODE;
+               outs->dma_address = SPARC_MAPPING_ERROR;
                outs->dma_length = 0;
        }
 
@@ -607,7 +607,7 @@ static int dma_4v_map_sg(struct device *dev, struct 
scatterlist *sglist,
                        iommu_tbl_range_free(tbl, vaddr, npages,
                                             IOMMU_ERROR_CODE);
                        /* XXX demap? XXX */
-                       s->dma_address = DMA_ERROR_CODE;
+                       s->dma_address = SPARC_MAPPING_ERROR;
                        s->dma_length = 0;
                }
                if (s == outs)
@@ -669,6 +669,11 @@ static void dma_4v_unmap_sg(struct device *dev, struct 
scatterlist *sglist,
        local_irq_restore(flags);
 }
 
+static int dma_4v_mapping_error(struct device *dev, dma_addr_t dma_addr)
+{
+       return dma_addr == SPARC_MAPPING_ERROR;
+}
+
 static const struct dma_map_ops sun4v_dma_ops = {
        .alloc                          = dma_4v_alloc_coherent,
        .free                           = dma_4v_free_coherent,
@@ -676,6 +681,7 @@ static const struct dma_map_ops sun4v_dma_ops = {
        .unmap_page                     = dma_4v_unmap_page,
        .map_sg                         = dma_4v_map_sg,
        .unmap_sg                       = dma_4v_unmap_sg,
+       .mapping_error                  = dma_4v_mapping_error,
 };
 
 static void pci_sun4v_scan_bus(struct pci_pbm_info *pbm, struct device *parent)
-- 
2.11.0


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