linux-kernel - [PATCH 07/23] sparc: remove the mapping_error dma_map

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Date:   Fri, 30 Nov 2018 14:22:15 +0100
From:   Christoph Hellwig <hch@....de>
To:     iommu@...ts.linux-foundation.org
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Jon Mason <jdmason@...zu.us>, Joerg Roedel <joro@...tes.org>,
        David Woodhouse <dwmw2@...radead.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>, x86@...nel.org,
        linux-alpha@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-ia64@...r.kernel.org, linux-parisc@...r.kernel.org,
        xen-devel@...ts.xenproject.org, linux-arch@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 07/23] sparc: remove the mapping_error dma_map_ops method

Sparc already returns (~(dma_addr_t)0x0) on mapping failures, so we can
switch over to returning DMA_MAPPING_ERROR and let the core dma-mapping
code handle the rest.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 arch/sparc/kernel/iommu.c        | 12 +++---------
 arch/sparc/kernel/iommu_common.h |  2 --
 arch/sparc/kernel/pci_sun4v.c    | 14 ++++----------
 3 files changed, 7 insertions(+), 21 deletions(-)

diff --git a/arch/sparc/kernel/iommu.c b/arch/sparc/kernel/iommu.c
index 40d008b0bd3e..0626bae5e3da 100644
--- a/arch/sparc/kernel/iommu.c
+++ b/arch/sparc/kernel/iommu.c
@@ -315,7 +315,7 @@ static dma_addr_t dma_4u_map_page(struct device *dev, struct page *page,
 bad_no_ctx:
 	if (printk_ratelimit())
 		WARN_ON(1);
-	return SPARC_MAPPING_ERROR;
+	return DMA_MAPPING_ERROR;
 }
 
 static void strbuf_flush(struct strbuf *strbuf, struct iommu *iommu,
@@ -548,7 +548,7 @@ static int dma_4u_map_sg(struct device *dev, struct scatterlist *sglist,
 
 	if (outcount < incount) {
 		outs = sg_next(outs);
-		outs->dma_address = SPARC_MAPPING_ERROR;
+		outs->dma_address = DMA_MAPPING_ERROR;
 		outs->dma_length = 0;
 	}
 
@@ -574,7 +574,7 @@ 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 = SPARC_MAPPING_ERROR;
+			s->dma_address = DMA_MAPPING_ERROR;
 			s->dma_length = 0;
 		}
 		if (s == outs)
@@ -742,11 +742,6 @@ 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 int dma_4u_supported(struct device *dev, u64 device_mask)
 {
 	struct iommu *iommu = dev->archdata.iommu;
@@ -772,7 +767,6 @@ static const struct dma_map_ops sun4u_dma_ops = {
 	.sync_single_for_cpu	= dma_4u_sync_single_for_cpu,
 	.sync_sg_for_cpu	= dma_4u_sync_sg_for_cpu,
 	.dma_supported		= dma_4u_supported,
-	.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 e3c02ba32500..d62ed9c5682d 100644
--- a/arch/sparc/kernel/iommu_common.h
+++ b/arch/sparc/kernel/iommu_common.h
@@ -48,6 +48,4 @@ 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 565d9ac883d0..fa0e42b4cbfb 100644
--- a/arch/sparc/kernel/pci_sun4v.c
+++ b/arch/sparc/kernel/pci_sun4v.c
@@ -414,12 +414,12 @@ static dma_addr_t dma_4v_map_page(struct device *dev, struct page *page,
 bad:
 	if (printk_ratelimit())
 		WARN_ON(1);
-	return SPARC_MAPPING_ERROR;
+	return DMA_MAPPING_ERROR;
 
 iommu_map_fail:
 	local_irq_restore(flags);
 	iommu_tbl_range_free(tbl, bus_addr, npages, IOMMU_ERROR_CODE);
-	return SPARC_MAPPING_ERROR;
+	return DMA_MAPPING_ERROR;
 }
 
 static void dma_4v_unmap_page(struct device *dev, dma_addr_t bus_addr,
@@ -592,7 +592,7 @@ static int dma_4v_map_sg(struct device *dev, struct scatterlist *sglist,
 
 	if (outcount < incount) {
 		outs = sg_next(outs);
-		outs->dma_address = SPARC_MAPPING_ERROR;
+		outs->dma_address = DMA_MAPPING_ERROR;
 		outs->dma_length = 0;
 	}
 
@@ -609,7 +609,7 @@ 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 = SPARC_MAPPING_ERROR;
+			s->dma_address = DMA_MAPPING_ERROR;
 			s->dma_length = 0;
 		}
 		if (s == outs)
@@ -688,11 +688,6 @@ static int dma_4v_supported(struct device *dev, u64 device_mask)
 	return pci64_dma_supported(to_pci_dev(dev), device_mask);
 }
 
-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,
@@ -701,7 +696,6 @@ static const struct dma_map_ops sun4v_dma_ops = {
 	.map_sg				= dma_4v_map_sg,
 	.unmap_sg			= dma_4v_unmap_sg,
 	.dma_supported			= dma_4v_supported,
-	.mapping_error			= dma_4v_mapping_error,
 };
 
 static void pci_sun4v_scan_bus(struct pci_pbm_info *pbm, struct device *parent)
-- 
2.19.1