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Message-Id: <20190213070133.11259-29-hch@lst.de>
Date: Wed, 13 Feb 2019 08:01:29 +0100
From: Christoph Hellwig <hch@....de>
To: Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Paul Mackerras <paulus@...ba.org>,
Michael Ellerman <mpe@...erman.id.au>,
Olof Johansson <olof@...om.net>
Cc: linuxppc-dev@...ts.ozlabs.org, iommu@...ts.linux-foundation.org,
linux-kernel@...r.kernel.org,
Christian Zigotzky <chzigotzky@...osoft.de>
Subject: [PATCH 28/32] powerpc/dma: use the dma_direct mapping routines
Switch the streaming DMA mapping and ownership transfer methods to the
functionally identical dma_direct_ versions. Factor the cache
maintainance helpers into the form expected by the common code for that.
Signed-off-by: Christoph Hellwig <hch@....de>
Tested-by: Christian Zigotzky <chzigotzky@...osoft.de>
---
arch/powerpc/include/asm/dma-mapping.h | 30 ---------
arch/powerpc/kernel/dma-iommu.c | 4 +-
arch/powerpc/kernel/dma.c | 87 +++-----------------------
arch/powerpc/mm/dma-noncoherent.c | 29 ++++++---
arch/powerpc/platforms/Kconfig.cputype | 2 +
5 files changed, 32 insertions(+), 120 deletions(-)
diff --git a/arch/powerpc/include/asm/dma-mapping.h b/arch/powerpc/include/asm/dma-mapping.h
index cdf70aaeafeb..4de9d4ee23c1 100644
--- a/arch/powerpc/include/asm/dma-mapping.h
+++ b/arch/powerpc/include/asm/dma-mapping.h
@@ -25,36 +25,6 @@ extern void *__dma_nommu_alloc_coherent(struct device *dev, size_t size,
extern void __dma_nommu_free_coherent(struct device *dev, size_t size,
void *vaddr, dma_addr_t dma_handle,
unsigned long attrs);
-int dma_nommu_map_sg(struct device *dev, struct scatterlist *sgl,
- int nents, enum dma_data_direction direction,
- unsigned long attrs);
-dma_addr_t dma_nommu_map_page(struct device *dev, struct page *page,
- unsigned long offset, size_t size,
- enum dma_data_direction dir, unsigned long attrs);
-
-#ifdef CONFIG_NOT_COHERENT_CACHE
-/*
- * DMA-consistent mapping functions for PowerPCs that don't support
- * cache snooping. These allocate/free a region of uncached mapped
- * memory space for use with DMA devices. Alternatively, you could
- * allocate the space "normally" and use the cache management functions
- * to ensure it is consistent.
- */
-struct device;
-extern void __dma_sync(void *vaddr, size_t size, int direction);
-extern void __dma_sync_page(struct page *page, unsigned long offset,
- size_t size, int direction);
-extern unsigned long __dma_get_coherent_pfn(unsigned long cpu_addr);
-
-#else /* ! CONFIG_NOT_COHERENT_CACHE */
-/*
- * Cache coherent cores.
- */
-
-#define __dma_sync(addr, size, rw) ((void)0)
-#define __dma_sync_page(pg, off, sz, rw) ((void)0)
-
-#endif /* ! CONFIG_NOT_COHERENT_CACHE */
static inline unsigned long device_to_mask(struct device *dev)
{
diff --git a/arch/powerpc/kernel/dma-iommu.c b/arch/powerpc/kernel/dma-iommu.c
index c75ba4e3a50c..09231ef06d01 100644
--- a/arch/powerpc/kernel/dma-iommu.c
+++ b/arch/powerpc/kernel/dma-iommu.c
@@ -68,7 +68,7 @@ static dma_addr_t dma_iommu_map_page(struct device *dev, struct page *page,
unsigned long attrs)
{
if (dma_iommu_map_bypass(dev, attrs))
- return dma_nommu_map_page(dev, page, offset, size, direction,
+ return dma_direct_map_page(dev, page, offset, size, direction,
attrs);
return iommu_map_page(dev, get_iommu_table_base(dev), page, offset,
size, device_to_mask(dev), direction, attrs);
@@ -90,7 +90,7 @@ static int dma_iommu_map_sg(struct device *dev, struct scatterlist *sglist,
unsigned long attrs)
{
if (dma_iommu_map_bypass(dev, attrs))
- return dma_nommu_map_sg(dev, sglist, nelems, direction, attrs);
+ return dma_direct_map_sg(dev, sglist, nelems, direction, attrs);
return ppc_iommu_map_sg(dev, get_iommu_table_base(dev), sglist, nelems,
device_to_mask(dev), direction, attrs);
}
diff --git a/arch/powerpc/kernel/dma.c b/arch/powerpc/kernel/dma.c
index f983f8d435a6..b9f7283e7224 100644
--- a/arch/powerpc/kernel/dma.c
+++ b/arch/powerpc/kernel/dma.c
@@ -27,77 +27,6 @@
* default the offset is PCI_DRAM_OFFSET.
*/
-int dma_nommu_map_sg(struct device *dev, struct scatterlist *sgl,
- int nents, enum dma_data_direction direction,
- unsigned long attrs)
-{
- struct scatterlist *sg;
- int i;
-
- for_each_sg(sgl, sg, nents, i) {
- sg->dma_address = phys_to_dma(dev, sg_phys(sg));
- sg->dma_length = sg->length;
-
- if (attrs & DMA_ATTR_SKIP_CPU_SYNC)
- continue;
-
- __dma_sync_page(sg_page(sg), sg->offset, sg->length, direction);
- }
-
- return nents;
-}
-
-static void dma_nommu_unmap_sg(struct device *dev, struct scatterlist *sgl,
- int nents, enum dma_data_direction direction,
- unsigned long attrs)
-{
- struct scatterlist *sg;
- int i;
-
- for_each_sg(sgl, sg, nents, i)
- __dma_sync_page(sg_page(sg), sg->offset, sg->length, direction);
-}
-
-dma_addr_t dma_nommu_map_page(struct device *dev, struct page *page,
- unsigned long offset, size_t size,
- enum dma_data_direction dir, unsigned long attrs)
-{
- if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
- __dma_sync_page(page, offset, size, dir);
-
- return phys_to_dma(dev, page_to_phys(page)) + offset;
-}
-
-static inline void dma_nommu_unmap_page(struct device *dev,
- dma_addr_t dma_address,
- size_t size,
- enum dma_data_direction direction,
- unsigned long attrs)
-{
- if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
- __dma_sync(bus_to_virt(dma_address), size, direction);
-}
-
-#ifdef CONFIG_NOT_COHERENT_CACHE
-static inline void dma_nommu_sync_sg(struct device *dev,
- struct scatterlist *sgl, int nents,
- enum dma_data_direction direction)
-{
- struct scatterlist *sg;
- int i;
-
- for_each_sg(sgl, sg, nents, i)
- __dma_sync_page(sg_page(sg), sg->offset, sg->length, direction);
-}
-
-static inline void dma_nommu_sync_single(struct device *dev,
- dma_addr_t dma_handle, size_t size,
- enum dma_data_direction direction)
-{
- __dma_sync(bus_to_virt(dma_handle), size, direction);
-}
-#endif
-
const struct dma_map_ops dma_nommu_ops = {
#ifdef CONFIG_NOT_COHERENT_CACHE
.alloc = __dma_nommu_alloc_coherent,
@@ -106,17 +35,17 @@ const struct dma_map_ops dma_nommu_ops = {
.alloc = dma_direct_alloc,
.free = dma_direct_free,
#endif
- .map_sg = dma_nommu_map_sg,
- .unmap_sg = dma_nommu_unmap_sg,
+ .map_sg = dma_direct_map_sg,
.dma_supported = dma_direct_supported,
- .map_page = dma_nommu_map_page,
- .unmap_page = dma_nommu_unmap_page,
+ .map_page = dma_direct_map_page,
.get_required_mask = dma_direct_get_required_mask,
#ifdef CONFIG_NOT_COHERENT_CACHE
- .sync_single_for_cpu = dma_nommu_sync_single,
- .sync_single_for_device = dma_nommu_sync_single,
- .sync_sg_for_cpu = dma_nommu_sync_sg,
- .sync_sg_for_device = dma_nommu_sync_sg,
+ .unmap_sg = dma_direct_unmap_sg,
+ .unmap_page = dma_direct_unmap_page,
+ .sync_single_for_cpu = dma_direct_sync_single_for_cpu,
+ .sync_single_for_device = dma_direct_sync_single_for_device,
+ .sync_sg_for_cpu = dma_direct_sync_sg_for_cpu,
+ .sync_sg_for_device = dma_direct_sync_sg_for_device,
#endif
};
EXPORT_SYMBOL(dma_nommu_ops);
diff --git a/arch/powerpc/mm/dma-noncoherent.c b/arch/powerpc/mm/dma-noncoherent.c
index ee95da19c82d..c3d15d718a58 100644
--- a/arch/powerpc/mm/dma-noncoherent.c
+++ b/arch/powerpc/mm/dma-noncoherent.c
@@ -314,7 +314,7 @@ void __dma_nommu_free_coherent(struct device *dev, size_t size, void *vaddr,
/*
* make an area consistent.
*/
-void __dma_sync(void *vaddr, size_t size, int direction)
+static void __dma_sync(void *vaddr, size_t size, int direction)
{
unsigned long start = (unsigned long)vaddr;
unsigned long end = start + size;
@@ -340,7 +340,6 @@ void __dma_sync(void *vaddr, size_t size, int direction)
break;
}
}
-EXPORT_SYMBOL(__dma_sync);
#ifdef CONFIG_HIGHMEM
/*
@@ -387,21 +386,33 @@ static inline void __dma_sync_page_highmem(struct page *page,
* __dma_sync_page makes memory consistent. identical to __dma_sync, but
* takes a struct page instead of a virtual address
*/
-void __dma_sync_page(struct page *page, unsigned long offset,
- size_t size, int direction)
+static void __dma_sync_page(phys_addr_t paddr, size_t size, int dir)
{
+ struct page *page = pfn_to_page(paddr >> PAGE_SHIFT);
+ unsigned offset = paddr & ~PAGE_MASK;
+
#ifdef CONFIG_HIGHMEM
- __dma_sync_page_highmem(page, offset, size, direction);
+ __dma_sync_page_highmem(page, offset, size, dir);
#else
unsigned long start = (unsigned long)page_address(page) + offset;
- __dma_sync((void *)start, size, direction);
+ __dma_sync((void *)start, size, dir);
#endif
}
-EXPORT_SYMBOL(__dma_sync_page);
+
+void arch_sync_dma_for_device(struct device *dev, phys_addr_t paddr,
+ size_t size, enum dma_data_direction dir)
+{
+ __dma_sync_page(paddr, size, dir);
+}
+
+void arch_sync_dma_for_cpu(struct device *dev, phys_addr_t paddr,
+ size_t size, enum dma_data_direction dir)
+{
+ __dma_sync_page(paddr, size, dir);
+}
/*
- * Return the PFN for a given cpu virtual address returned by
- * __dma_nommu_alloc_coherent.
+ * Return the PFN for a given cpu virtual address returned by arch_dma_alloc.
*/
long arch_dma_coherent_to_pfn(struct device *dev, void *vaddr,
dma_addr_t dma_addr)
diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype
index dea50355f6e8..842b2c7e156a 100644
--- a/arch/powerpc/platforms/Kconfig.cputype
+++ b/arch/powerpc/platforms/Kconfig.cputype
@@ -409,6 +409,8 @@ config NOT_COHERENT_CACHE
depends on 4xx || PPC_8xx || E200 || PPC_MPC512x || \
GAMECUBE_COMMON || AMIGAONE
select ARCH_HAS_DMA_COHERENT_TO_PFN
+ select ARCH_HAS_SYNC_DMA_FOR_DEVICE
+ select ARCH_HAS_SYNC_DMA_FOR_CPU
default n if PPC_47x
default y
--
2.20.1
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