[PATCH 4/4] ARM/dma-mapping: remove the arm specific phys to dma translation helpers

Christoph Hellwig
2020-09-17T17:45:16Z

Now that the two remaining architectures that hooked into the DMA
translation directly use the range map instead, there is no need to
override phys_to_dma and dma_to_phys. Remove asm/dma-direct.h after
switching the remaining callsites to the phys addr based generic
helpers instead of the PFN or virt addr based arm ones.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
arch/arm/Kconfig | 1 -
arch/arm/common/dmabounce.c | 14 +++++-----
arch/arm/include/asm/dma-direct.h | 45 -------------------------------
arch/arm/mm/dma-mapping.c | 20 +++++++-------
4 files changed, 17 insertions(+), 63 deletions(-)
delete mode 100644 arch/arm/include/asm/dma-direct.h

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index e00d94b1665876..2c4d608fa5fecf 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -14,7 +14,6 @@ config ARM
select ARCH_HAS_MEMBARRIER_SYNC_CORE
select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
select ARCH_HAS_PTE_SPECIAL if ARM_LPAE
- select ARCH_HAS_PHYS_TO_DMA
select ARCH_HAS_SETUP_DMA_OPS
select ARCH_HAS_SET_MEMORY
select ARCH_HAS_STRICT_KERNEL_RWX if MMU && !XIP_KERNEL
diff --git a/arch/arm/common/dmabounce.c b/arch/arm/common/dmabounce.c
index d3e00ea9208834..561d6d06c6b6aa 100644
--- a/arch/arm/common/dmabounce.c
+++ b/arch/arm/common/dmabounce.c
@@ -258,7 +258,7 @@ static inline dma_addr_t map_single(struct device *dev, void *ptr, size_t size,
}

dev_dbg(dev, "%s: unsafe buffer %p (dma=%#x) mapped to %p (dma=%#x)\n",
- __func__, buf->ptr, virt_to_dma(dev, buf->ptr),
+ __func__, buf->ptr, phys_to_dma(dev, virt_to_phys(buf->ptr)),
buf->safe, buf->safe_dma_addr);

if ((dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL) &&
@@ -279,7 +279,7 @@ static inline void unmap_single(struct device *dev, struct safe_buffer *buf,
BUG_ON(buf->direction != dir);

dev_dbg(dev, "%s: unsafe buffer %p (dma=%#x) mapped to %p (dma=%#x)\n",
- __func__, buf->ptr, virt_to_dma(dev, buf->ptr),
+ __func__, buf->ptr, phys_to_dma(dev, virt_to_phys(buf->ptr)),
buf->safe, buf->safe_dma_addr);

DO_STATS(dev->archdata.dmabounce->bounce_count++);
@@ -320,7 +320,7 @@ static dma_addr_t dmabounce_map_page(struct device *dev, struct page *page,
dev_dbg(dev, "%s(page=%p,off=%#lx,size=%zx,dir=%x)\n",
__func__, page, offset, size, dir);

- dma_addr = pfn_to_dma(dev, page_to_pfn(page)) + offset;
+ dma_addr = phys_to_dma(dev, page_to_phys(page)) + offset;

ret = needs_bounce(dev, dma_addr, size);
if (ret < 0)
@@ -380,8 +380,8 @@ static int __dmabounce_sync_for_cpu(struct device *dev, dma_addr_t addr,
BUG_ON(buf->direction != dir);

dev_dbg(dev, "%s: unsafe buffer %p (dma=%#x off=%#lx) mapped to %p (dma=%#x)\n",
- __func__, buf->ptr, virt_to_dma(dev, buf->ptr), off,
- buf->safe, buf->safe_dma_addr);
+ __func__, buf->ptr, phys_to_dma(dev, virt_to_phys(buf->ptr)),
+ off, buf->safe, buf->safe_dma_addr);

DO_STATS(dev->archdata.dmabounce->bounce_count++);

@@ -420,8 +420,8 @@ static int __dmabounce_sync_for_device(struct device *dev, dma_addr_t addr,
BUG_ON(buf->direction != dir);

dev_dbg(dev, "%s: unsafe buffer %p (dma=%#x off=%#lx) mapped to %p (dma=%#x)\n",
- __func__, buf->ptr, virt_to_dma(dev, buf->ptr), off,
- buf->safe, buf->safe_dma_addr);
+ __func__, buf->ptr, phys_to_dma(dev, virt_to_phys(buf->ptr)),
+ off, buf->safe, buf->safe_dma_addr);

DO_STATS(dev->archdata.dmabounce->bounce_count++);

diff --git a/arch/arm/include/asm/dma-direct.h b/arch/arm/include/asm/dma-direct.h
deleted file mode 100644
index 84cb4e30658891..00000000000000
--- a/arch/arm/include/asm/dma-direct.h
+++ /dev/null
@@ -1,45 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef ASM_ARM_DMA_DIRECT_H
-#define ASM_ARM_DMA_DIRECT_H 1
-
-#include <asm/memory.h>
-
-/*
- * dma_to_pfn/pfn_to_dma/virt_to_dma are architecture private
- * functions used internally by the DMA-mapping API to provide DMA
- * addresses. They must not be used by drivers.
- */
-static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn)
-{
- if (dev->dma_range_map)
- pfn = PFN_DOWN(translate_phys_to_dma(dev, PFN_PHYS(pfn)));
- return (dma_addr_t)__pfn_to_phys(pfn);
-}
-
-static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr)
-{
- unsigned long pfn = __phys_to_pfn(addr);
-
- if (dev->dma_range_map)
- pfn = PFN_DOWN(translate_dma_to_phys(dev, PFN_PHYS(pfn)));
- return pfn;
-}
-
-static inline dma_addr_t virt_to_dma(struct device *dev, void *addr)
-{
- return (dma_addr_t)__virt_to_bus((unsigned long)(addr));
-}
-
-static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
-{
- unsigned int offset = paddr & ~PAGE_MASK;
- return pfn_to_dma(dev, __phys_to_pfn(paddr)) + offset;
-}
-
-static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr)
-{
- unsigned int offset = dev_addr & ~PAGE_MASK;
- return __pfn_to_phys(dma_to_pfn(dev, dev_addr)) + offset;
-}
-
-#endif /* ASM_ARM_DMA_DIRECT_H */
diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index 8a8949174b1c06..9d800d0a53af7a 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -131,14 +131,14 @@ static dma_addr_t arm_dma_map_page(struct device *dev, struct page *page,
{
if ((attrs & DMA_ATTR_SKIP_CPU_SYNC) == 0)
__dma_page_cpu_to_dev(page, offset, size, dir);
- return pfn_to_dma(dev, page_to_pfn(page)) + offset;
+ return phys_to_dma(dev, page_to_phys(page)) + offset;
}

static dma_addr_t arm_coherent_dma_map_page(struct device *dev, struct page *page,
unsigned long offset, size_t size, enum dma_data_direction dir,
unsigned long attrs)
{
- return pfn_to_dma(dev, page_to_pfn(page)) + offset;
+ return phys_to_dma(dev, page_to_phys(page)) + offset;
}

/**
@@ -159,7 +159,7 @@ static void arm_dma_unmap_page(struct device *dev, dma_addr_t handle,
size_t size, enum dma_data_direction dir, unsigned long attrs)
{
if ((attrs & DMA_ATTR_SKIP_CPU_SYNC) == 0)
- __dma_page_dev_to_cpu(pfn_to_page(dma_to_pfn(dev, handle)),
+ __dma_page_dev_to_cpu(phys_to_page(dma_to_phys(dev, handle)),
handle & ~PAGE_MASK, size, dir);
}

@@ -167,7 +167,7 @@ static void arm_dma_sync_single_for_cpu(struct device *dev,
dma_addr_t handle, size_t size, enum dma_data_direction dir)
{
unsigned int offset = handle & (PAGE_SIZE - 1);
- struct page *page = pfn_to_page(dma_to_pfn(dev, handle-offset));
+ struct page *page = phys_to_page(dma_to_phys(dev, handle-offset));
__dma_page_dev_to_cpu(page, offset, size, dir);
}

@@ -175,7 +175,7 @@ static void arm_dma_sync_single_for_device(struct device *dev,
dma_addr_t handle, size_t size, enum dma_data_direction dir)
{
unsigned int offset = handle & (PAGE_SIZE - 1);
- struct page *page = pfn_to_page(dma_to_pfn(dev, handle-offset));
+ struct page *page = phys_to_page(dma_to_phys(dev, handle-offset));
__dma_page_cpu_to_dev(page, offset, size, dir);
}

@@ -193,7 +193,7 @@ static int arm_dma_supported(struct device *dev, u64 mask)
* Translate the device's DMA mask to a PFN limit. This
* PFN number includes the page which we can DMA to.
*/
- return dma_to_pfn(dev, mask) >= max_dma_pfn;
+ return PHYS_PFN(dma_to_phys(dev, mask)) >= max_dma_pfn;
}

const struct dma_map_ops arm_dma_ops = {
@@ -722,7 +722,7 @@ static void *__dma_alloc(struct device *dev, size_t size, dma_addr_t *handle,
if (page) {
unsigned long flags;

- *handle = pfn_to_dma(dev, page_to_pfn(page));
+ *handle = phys_to_dma(dev, page_to_phys(page));
buf->virt = args.want_vaddr ? addr : page;

spin_lock_irqsave(&arm_dma_bufs_lock, flags);
@@ -762,7 +762,7 @@ static int __arm_dma_mmap(struct device *dev, struct vm_area_struct *vma,
int ret = -ENXIO;
unsigned long nr_vma_pages = vma_pages(vma);
unsigned long nr_pages = PAGE_ALIGN(size) >> PAGE_SHIFT;
- unsigned long pfn = dma_to_pfn(dev, dma_addr);
+ unsigned long pfn = PHYS_PFN(dma_to_phys(dev, dma_addr));
unsigned long off = vma->vm_pgoff;

if (dma_mmap_from_dev_coherent(dev, vma, cpu_addr, size, &ret))
@@ -803,7 +803,7 @@ static void __arm_dma_free(struct device *dev, size_t size, void *cpu_addr,
dma_addr_t handle, unsigned long attrs,
bool is_coherent)
{
- struct page *page = pfn_to_page(dma_to_pfn(dev, handle));
+ struct page *page = phys_to_page(dma_to_phys(dev, handle));
struct arm_dma_buffer *buf;
struct arm_dma_free_args args = {
.dev = dev,
@@ -837,7 +837,7 @@ int arm_dma_get_sgtable(struct device *dev, struct sg_table *sgt,
void *cpu_addr, dma_addr_t handle, size_t size,
unsigned long attrs)
{
- unsigned long pfn = dma_to_pfn(dev, handle);
+ unsigned long pfn = PHYS_PFN(dma_to_phys(dev, handle));
struct page *page;
int ret;

--
2.28.0