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Message-Id: <20170616181059.19206-21-hch@lst.de>
Date: Fri, 16 Jun 2017 20:10:35 +0200
From: Christoph Hellwig <hch@....de>
To: x86@...nel.org, linux-arm-kernel@...ts.infradead.org,
xen-devel@...ts.xenproject.org, linux-c6x-dev@...ux-c6x.org,
linux-hexagon@...r.kernel.org, linux-ia64@...r.kernel.org,
linux-mips@...ux-mips.org, openrisc@...ts.librecores.org,
linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
linux-sh@...r.kernel.org, sparclinux@...r.kernel.org,
linux-xtensa@...ux-xtensa.org, dmaengine@...r.kernel.org,
linux-tegra@...r.kernel.org, dri-devel@...ts.freedesktop.org,
linux-samsung-soc@...r.kernel.org,
iommu@...ts.linux-foundation.org, netdev@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Subject: [PATCH 20/44] sparc: implement ->mapping_error
DMA_ERROR_CODE is going to go away, so don't rely on it.
Signed-off-by: Christoph Hellwig <hch@....de>
Acked-by: David S. Miller <davem@...emloft.net>
---
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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