[PATCH 04/22] alpha: use dma_direct_ops for jensen

Christoph Hellwig
2018-04-20T08:04:09Z

The generic dma_direct implementation does the same thing as the alpha
pci-noop implementation, just with more bells and whistles. And unlike
the current code it at least has a theoretical chance to actually compile.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
arch/alpha/Kconfig | 1 +
arch/alpha/include/asm/dma-mapping.h | 4 ++++
arch/alpha/kernel/pci-noop.c | 33 ----------------------------
3 files changed, 5 insertions(+), 33 deletions(-)

diff --git a/arch/alpha/Kconfig b/arch/alpha/Kconfig
index aa7df1a36fd0..94af0c7f494a 100644
--- a/arch/alpha/Kconfig
+++ b/arch/alpha/Kconfig
@@ -204,6 +204,7 @@ config ALPHA_EIGER
config ALPHA_JENSEN
bool "Jensen"
depends on BROKEN
+ select DMA_DIRECT_OPS
help
DEC PC 150 AXP (aka Jensen): This is a very old Digital system - one
of the first-generation Alpha systems. A number of these systems
diff --git a/arch/alpha/include/asm/dma-mapping.h b/arch/alpha/include/asm/dma-mapping.h
index b78f61f20796..76ce923ecca1 100644
--- a/arch/alpha/include/asm/dma-mapping.h
+++ b/arch/alpha/include/asm/dma-mapping.h
@@ -6,7 +6,11 @@ extern const struct dma_map_ops *dma_ops;

static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
{
+#ifdef CONFIG_ALPHA_JENSEN
+ return &dma_direct_ops;
+#else
return dma_ops;
+#endif
}

#endif /* _ALPHA_DMA_MAPPING_H */
diff --git a/arch/alpha/kernel/pci-noop.c b/arch/alpha/kernel/pci-noop.c
index b6ebb65127a8..c7c5879869d3 100644
--- a/arch/alpha/kernel/pci-noop.c
+++ b/arch/alpha/kernel/pci-noop.c
@@ -102,36 +102,3 @@ SYSCALL_DEFINE5(pciconfig_write, unsigned long, bus, unsigned long, dfn,
else
return -ENODEV;
}
-
-static void *alpha_noop_alloc_coherent(struct device *dev, size_t size,
- dma_addr_t *dma_handle, gfp_t gfp,
- unsigned long attrs)
-{
- void *ret;
-
- if (!dev || *dev->dma_mask >= 0xffffffffUL)
- gfp &= ~GFP_DMA;
- ret = (void *)__get_free_pages(gfp, get_order(size));
- if (ret) {
- memset(ret, 0, size);
- *dma_handle = virt_to_phys(ret);
- }
- return ret;
-}
-
-static int alpha_noop_supported(struct device *dev, u64 mask)
-{
- return mask < 0x00ffffffUL ? 0 : 1;
-}
-
-const struct dma_map_ops alpha_noop_ops = {
- .alloc = alpha_noop_alloc_coherent,
- .free = dma_noop_free_coherent,
- .map_page = dma_noop_map_page,
- .map_sg = dma_noop_map_sg,
- .mapping_error = dma_noop_mapping_error,
- .dma_supported = alpha_noop_supported,
-};
-
-const struct dma_map_ops *dma_ops = &alpha_noop_ops;
-EXPORT_SYMBOL(dma_ops);
--
2.17.0