Subject: [PATCH 4/6] arm: add arch_sync_dma_for_*()

From: Rob Clark <[email-masked]>
Date: Wed, 14 Aug 2019 14:59:59 -0700

From: Rob Clark <[email-masked]>

Signed-off-by: Rob Clark <[email-masked]>
---
 arch/arm/Kconfig                |  2 ++
 arch/arm/mm/dma-mapping-nommu.c | 14 ++++++++++++++
 arch/arm/mm/dma-mapping.c       | 28 ++++++++++++++++++++++++++++
 3 files changed, 44 insertions(+)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 33b00579beff..a48a7263a2c1 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -18,6 +18,8 @@ config ARM
 	select ARCH_HAS_SET_MEMORY
 	select ARCH_HAS_STRICT_KERNEL_RWX if MMU && !XIP_KERNEL
 	select ARCH_HAS_STRICT_MODULE_RWX if MMU
+	select ARCH_HAS_SYNC_DMA_FOR_DEVICE
+	select ARCH_HAS_SYNC_DMA_FOR_CPU
 	select ARCH_HAS_TEARDOWN_DMA_OPS if MMU
 	select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
 	select ARCH_HAVE_CUSTOM_GPIO_H
diff --git a/arch/arm/mm/dma-mapping-nommu.c b/arch/arm/mm/dma-mapping-nommu.c
index 52b82559d99b..4a3df952151f 100644
--- a/arch/arm/mm/dma-mapping-nommu.c
+++ b/arch/arm/mm/dma-mapping-nommu.c
@@ -84,6 +84,13 @@ static void __dma_page_cpu_to_dev(phys_addr_t paddr, size_t size,
 		outer_clean_range(paddr, paddr + size);
 }
 
+void arch_sync_dma_for_device(struct device *dev, phys_addr_t paddr,
+		size_t size, enum dma_data_direction dir)
+{
+	__dma_page_cpu_to_dev(paddr, size, dir);
+}
+EXPORT_SYMBOL_GPL(arch_sync_dma_for_device);
+
 static void __dma_page_dev_to_cpu(phys_addr_t paddr, size_t size,
 				  enum dma_data_direction dir)
 {
@@ -93,6 +100,13 @@ static void __dma_page_dev_to_cpu(phys_addr_t paddr, size_t size,
 	}
 }
 
+void arch_sync_dma_for_cpu(struct device *dev, phys_addr_t paddr,
+		size_t size, enum dma_data_direction dir)
+{
+	__dma_page_dev_to_cpu(paddr, size, dir);
+}
+EXPORT_SYMBOL_GPL(arch_sync_dma_for_cpu);
+
 static dma_addr_t arm_nommu_dma_map_page(struct device *dev, struct page *page,
 					 unsigned long offset, size_t size,
 					 enum dma_data_direction dir,
diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index 6774b03aa405..8ead93196194 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -979,6 +979,13 @@ static void __dma_page_cpu_to_dev(struct page *page, unsigned long off,
 	/* FIXME: non-speculating: flush on bidirectional mappings? */
 }
 
+void arch_sync_dma_for_device(struct device *dev, phys_addr_t paddr,
+		size_t size, enum dma_data_direction dir)
+{
+	__dma_page_cpu_to_dev(phys_to_page(paddr), paddr % PAGE_SIZE, size, dir);
+}
+EXPORT_SYMBOL_GPL(arch_sync_dma_for_device);
+
 static void __dma_page_dev_to_cpu(struct page *page, unsigned long off,
 	size_t size, enum dma_data_direction dir)
 {
@@ -1013,6 +1020,27 @@ static void __dma_page_dev_to_cpu(struct page *page, unsigned long off,
 	}
 }
 
+void arch_sync_dma_for_cpu(struct device *dev, phys_addr_t paddr,
+		size_t size, enum dma_data_direction dir)
+{
+	__dma_page_dev_to_cpu(phys_to_page(paddr), paddr % PAGE_SIZE, size, dir);
+}
+EXPORT_SYMBOL_GPL(arch_sync_dma_for_cpu);
+
+/*
+ * arch_dma_{alloc,free} fail-stubs needed to avoid link-errors in dma/direct.c
+ * (which is not actually used on arch/arm)
+ */
+void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
+		gfp_t flags, unsigned long attrs)
+{
+	return NULL;
+}
+void arch_dma_free(struct device *dev, size_t size, void *vaddr,
+		dma_addr_t dma_handle, unsigned long attrs)
+{
+}
+
 /**
  * arm_dma_map_sg - map a set of SG buffers for streaming mode DMA
  * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
-- 
2.21.0

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