dma-mapping: move all DMA mapping code to kernel/dma

Currently the code is split over various files with dma- prefixes in the
lib/ and drives/base directories, and the number of files keeps growing.
Move them into a single directory to keep the code together and remove
the file name prefixes.  To match the irq infrastructure this directory
is placed under the kernel/ directory.

Signed-off-by: Christoph Hellwig <hch@lst.de>

4 files changed, 0 insertions, 1060 deletions

diff --git a/drivers/base/Makefile b/drivers/base/Makefile
index b074f242a435..704f44295810 100644
--- a/drivers/base/Makefile
+++ b/drivers/base/Makefile
@@ -8,10 +8,7 @@ obj-y			:= component.o core.o bus.o dd.o syscore.o \
 			   topology.o container.o property.o cacheinfo.o \
 			   devcon.o
 obj-$(CONFIG_DEVTMPFS)	+= devtmpfs.o
-obj-$(CONFIG_DMA_CMA) += dma-contiguous.o
 obj-y			+= power/
-obj-$(CONFIG_HAS_DMA)	+= dma-mapping.o
-obj-$(CONFIG_HAVE_GENERIC_DMA_COHERENT) += dma-coherent.o
 obj-$(CONFIG_ISA_BUS_API)	+= isa.o
 obj-y				+= firmware_loader/
 obj-$(CONFIG_NUMA)	+= node.o
diff --git a/drivers/base/dma-coherent.c b/drivers/base/dma-coherent.c
deleted file mode 100644
index 597d40893862..000000000000
--- a/drivers/base/dma-coherent.c
+++ /dev/null
@@ -1,434 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Coherent per-device memory handling.
- * Borrowed from i386
- */
-#include <linux/io.h>
-#include <linux/slab.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/dma-mapping.h>
-
-struct dma_coherent_mem {
-	void		*virt_base;
-	dma_addr_t	device_base;
-	unsigned long	pfn_base;
-	int		size;
-	int		flags;
-	unsigned long	*bitmap;
-	spinlock_t	spinlock;
-	bool		use_dev_dma_pfn_offset;
-};
-
-static struct dma_coherent_mem *dma_coherent_default_memory __ro_after_init;
-
-static inline struct dma_coherent_mem *dev_get_coherent_memory(struct device *dev)
-{
-	if (dev && dev->dma_mem)
-		return dev->dma_mem;
-	return NULL;
-}
-
-static inline dma_addr_t dma_get_device_base(struct device *dev,
-					     struct dma_coherent_mem * mem)
-{
-	if (mem->use_dev_dma_pfn_offset)
-		return (mem->pfn_base - dev->dma_pfn_offset) << PAGE_SHIFT;
-	else
-		return mem->device_base;
-}
-
-static int dma_init_coherent_memory(
-	phys_addr_t phys_addr, dma_addr_t device_addr, size_t size, int flags,
-	struct dma_coherent_mem **mem)
-{
-	struct dma_coherent_mem *dma_mem = NULL;
-	void __iomem *mem_base = NULL;
-	int pages = size >> PAGE_SHIFT;
-	int bitmap_size = BITS_TO_LONGS(pages) * sizeof(long);
-	int ret;
-
-	if (!size) {
-		ret = -EINVAL;
-		goto out;
-	}
-
-	mem_base = memremap(phys_addr, size, MEMREMAP_WC);
-	if (!mem_base) {
-		ret = -EINVAL;
-		goto out;
-	}
-	dma_mem = kzalloc(sizeof(struct dma_coherent_mem), GFP_KERNEL);
-	if (!dma_mem) {
-		ret = -ENOMEM;
-		goto out;
-	}
-	dma_mem->bitmap = kzalloc(bitmap_size, GFP_KERNEL);
-	if (!dma_mem->bitmap) {
-		ret = -ENOMEM;
-		goto out;
-	}
-
-	dma_mem->virt_base = mem_base;
-	dma_mem->device_base = device_addr;
-	dma_mem->pfn_base = PFN_DOWN(phys_addr);
-	dma_mem->size = pages;
-	dma_mem->flags = flags;
-	spin_lock_init(&dma_mem->spinlock);
-
-	*mem = dma_mem;
-	return 0;
-
-out:
-	kfree(dma_mem);
-	if (mem_base)
-		memunmap(mem_base);
-	return ret;
-}
-
-static void dma_release_coherent_memory(struct dma_coherent_mem *mem)
-{
-	if (!mem)
-		return;
-
-	memunmap(mem->virt_base);
-	kfree(mem->bitmap);
-	kfree(mem);
-}
-
-static int dma_assign_coherent_memory(struct device *dev,
-				      struct dma_coherent_mem *mem)
-{
-	if (!dev)
-		return -ENODEV;
-
-	if (dev->dma_mem)
-		return -EBUSY;
-
-	dev->dma_mem = mem;
-	return 0;
-}
-
-int dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
-				dma_addr_t device_addr, size_t size, int flags)
-{
-	struct dma_coherent_mem *mem;
-	int ret;
-
-	ret = dma_init_coherent_memory(phys_addr, device_addr, size, flags, &mem);
-	if (ret)
-		return ret;
-
-	ret = dma_assign_coherent_memory(dev, mem);
-	if (ret)
-		dma_release_coherent_memory(mem);
-	return ret;
-}
-EXPORT_SYMBOL(dma_declare_coherent_memory);
-
-void dma_release_declared_memory(struct device *dev)
-{
-	struct dma_coherent_mem *mem = dev->dma_mem;
-
-	if (!mem)
-		return;
-	dma_release_coherent_memory(mem);
-	dev->dma_mem = NULL;
-}
-EXPORT_SYMBOL(dma_release_declared_memory);
-
-void *dma_mark_declared_memory_occupied(struct device *dev,
-					dma_addr_t device_addr, size_t size)
-{
-	struct dma_coherent_mem *mem = dev->dma_mem;
-	unsigned long flags;
-	int pos, err;
-
-	size += device_addr & ~PAGE_MASK;
-
-	if (!mem)
-		return ERR_PTR(-EINVAL);
-
-	spin_lock_irqsave(&mem->spinlock, flags);
-	pos = PFN_DOWN(device_addr - dma_get_device_base(dev, mem));
-	err = bitmap_allocate_region(mem->bitmap, pos, get_order(size));
-	spin_unlock_irqrestore(&mem->spinlock, flags);
-
-	if (err != 0)
-		return ERR_PTR(err);
-	return mem->virt_base + (pos << PAGE_SHIFT);
-}
-EXPORT_SYMBOL(dma_mark_declared_memory_occupied);
-
-static void *__dma_alloc_from_coherent(struct dma_coherent_mem *mem,
-		ssize_t size, dma_addr_t *dma_handle)
-{
-	int order = get_order(size);
-	unsigned long flags;
-	int pageno;
-	void *ret;
-
-	spin_lock_irqsave(&mem->spinlock, flags);
-
-	if (unlikely(size > (mem->size << PAGE_SHIFT)))
-		goto err;
-
-	pageno = bitmap_find_free_region(mem->bitmap, mem->size, order);
-	if (unlikely(pageno < 0))
-		goto err;
-
-	/*
-	 * Memory was found in the coherent area.
-	 */
-	*dma_handle = mem->device_base + (pageno << PAGE_SHIFT);
-	ret = mem->virt_base + (pageno << PAGE_SHIFT);
-	spin_unlock_irqrestore(&mem->spinlock, flags);
-	memset(ret, 0, size);
-	return ret;
-err:
-	spin_unlock_irqrestore(&mem->spinlock, flags);
-	return NULL;
-}
-
-/**
- * dma_alloc_from_dev_coherent() - allocate memory from device coherent pool
- * @dev:	device from which we allocate memory
- * @size:	size of requested memory area
- * @dma_handle:	This will be filled with the correct dma handle
- * @ret:	This pointer will be filled with the virtual address
- *		to allocated area.
- *
- * This function should be only called from per-arch dma_alloc_coherent()
- * to support allocation from per-device coherent memory pools.
- *
- * Returns 0 if dma_alloc_coherent should continue with allocating from
- * generic memory areas, or !0 if dma_alloc_coherent should return @ret.
- */
-int dma_alloc_from_dev_coherent(struct device *dev, ssize_t size,
-		dma_addr_t *dma_handle, void **ret)
-{
-	struct dma_coherent_mem *mem = dev_get_coherent_memory(dev);
-
-	if (!mem)
-		return 0;
-
-	*ret = __dma_alloc_from_coherent(mem, size, dma_handle);
-	if (*ret)
-		return 1;
-
-	/*
-	 * In the case where the allocation can not be satisfied from the
-	 * per-device area, try to fall back to generic memory if the
-	 * constraints allow it.
-	 */
-	return mem->flags & DMA_MEMORY_EXCLUSIVE;
-}
-EXPORT_SYMBOL(dma_alloc_from_dev_coherent);
-
-void *dma_alloc_from_global_coherent(ssize_t size, dma_addr_t *dma_handle)
-{
-	if (!dma_coherent_default_memory)
-		return NULL;
-
-	return __dma_alloc_from_coherent(dma_coherent_default_memory, size,
-			dma_handle);
-}
-
-static int __dma_release_from_coherent(struct dma_coherent_mem *mem,
-				       int order, void *vaddr)
-{
-	if (mem && vaddr >= mem->virt_base && vaddr <
-		   (mem->virt_base + (mem->size << PAGE_SHIFT))) {
-		int page = (vaddr - mem->virt_base) >> PAGE_SHIFT;
-		unsigned long flags;
-
-		spin_lock_irqsave(&mem->spinlock, flags);
-		bitmap_release_region(mem->bitmap, page, order);
-		spin_unlock_irqrestore(&mem->spinlock, flags);
-		return 1;
-	}
-	return 0;
-}
-
-/**
- * dma_release_from_dev_coherent() - free memory to device coherent memory pool
- * @dev:	device from which the memory was allocated
- * @order:	the order of pages allocated
- * @vaddr:	virtual address of allocated pages
- *
- * This checks whether the memory was allocated from the per-device
- * coherent memory pool and if so, releases that memory.
- *
- * Returns 1 if we correctly released the memory, or 0 if the caller should
- * proceed with releasing memory from generic pools.
- */
-int dma_release_from_dev_coherent(struct device *dev, int order, void *vaddr)
-{
-	struct dma_coherent_mem *mem = dev_get_coherent_memory(dev);
-
-	return __dma_release_from_coherent(mem, order, vaddr);
-}
-EXPORT_SYMBOL(dma_release_from_dev_coherent);
-
-int dma_release_from_global_coherent(int order, void *vaddr)
-{
-	if (!dma_coherent_default_memory)
-		return 0;
-
-	return __dma_release_from_coherent(dma_coherent_default_memory, order,
-			vaddr);
-}
-
-static int __dma_mmap_from_coherent(struct dma_coherent_mem *mem,
-		struct vm_area_struct *vma, void *vaddr, size_t size, int *ret)
-{
-	if (mem && vaddr >= mem->virt_base && vaddr + size <=
-		   (mem->virt_base + (mem->size << PAGE_SHIFT))) {
-		unsigned long off = vma->vm_pgoff;
-		int start = (vaddr - mem->virt_base) >> PAGE_SHIFT;
-		int user_count = vma_pages(vma);
-		int count = PAGE_ALIGN(size) >> PAGE_SHIFT;
-
-		*ret = -ENXIO;
-		if (off < count && user_count <= count - off) {
-			unsigned long pfn = mem->pfn_base + start + off;
-			*ret = remap_pfn_range(vma, vma->vm_start, pfn,
-					       user_count << PAGE_SHIFT,
-					       vma->vm_page_prot);
-		}
-		return 1;
-	}
-	return 0;
-}
-
-/**
- * dma_mmap_from_dev_coherent() - mmap memory from the device coherent pool
- * @dev:	device from which the memory was allocated
- * @vma:	vm_area for the userspace memory
- * @vaddr:	cpu address returned by dma_alloc_from_dev_coherent
- * @size:	size of the memory buffer allocated
- * @ret:	result from remap_pfn_range()
- *
- * This checks whether the memory was allocated from the per-device
- * coherent memory pool and if so, maps that memory to the provided vma.
- *
- * Returns 1 if @vaddr belongs to the device coherent pool and the caller
- * should return @ret, or 0 if they should proceed with mapping memory from
- * generic areas.
- */
-int dma_mmap_from_dev_coherent(struct device *dev, struct vm_area_struct *vma,
-			   void *vaddr, size_t size, int *ret)
-{
-	struct dma_coherent_mem *mem = dev_get_coherent_memory(dev);
-
-	return __dma_mmap_from_coherent(mem, vma, vaddr, size, ret);
-}
-EXPORT_SYMBOL(dma_mmap_from_dev_coherent);
-
-int dma_mmap_from_global_coherent(struct vm_area_struct *vma, void *vaddr,
-				   size_t size, int *ret)
-{
-	if (!dma_coherent_default_memory)
-		return 0;
-
-	return __dma_mmap_from_coherent(dma_coherent_default_memory, vma,
-					vaddr, size, ret);
-}
-
-/*
- * Support for reserved memory regions defined in device tree
- */
-#ifdef CONFIG_OF_RESERVED_MEM
-#include <linux/of.h>
-#include <linux/of_fdt.h>
-#include <linux/of_reserved_mem.h>
-
-static struct reserved_mem *dma_reserved_default_memory __initdata;
-
-static int rmem_dma_device_init(struct reserved_mem *rmem, struct device *dev)
-{
-	struct dma_coherent_mem *mem = rmem->priv;
-	int ret;
-
-	if (!mem) {
-		ret = dma_init_coherent_memory(rmem->base, rmem->base,
-					       rmem->size,
-					       DMA_MEMORY_EXCLUSIVE, &mem);
-		if (ret) {
-			pr_err("Reserved memory: failed to init DMA memory pool at %pa, size %ld MiB\n",
-				&rmem->base, (unsigned long)rmem->size / SZ_1M);
-			return ret;
-		}
-	}
-	mem->use_dev_dma_pfn_offset = true;
-	rmem->priv = mem;
-	dma_assign_coherent_memory(dev, mem);
-	return 0;
-}
-
-static void rmem_dma_device_release(struct reserved_mem *rmem,
-				    struct device *dev)
-{
-	if (dev)
-		dev->dma_mem = NULL;
-}
-
-static const struct reserved_mem_ops rmem_dma_ops = {
-	.device_init	= rmem_dma_device_init,
-	.device_release	= rmem_dma_device_release,
-};
-
-static int __init rmem_dma_setup(struct reserved_mem *rmem)
-{
-	unsigned long node = rmem->fdt_node;
-
-	if (of_get_flat_dt_prop(node, "reusable", NULL))
-		return -EINVAL;
-
-#ifdef CONFIG_ARM
-	if (!of_get_flat_dt_prop(node, "no-map", NULL)) {
-		pr_err("Reserved memory: regions without no-map are not yet supported\n");
-		return -EINVAL;
-	}
-
-	if (of_get_flat_dt_prop(node, "linux,dma-default", NULL)) {
-		WARN(dma_reserved_default_memory,
-		     "Reserved memory: region for default DMA coherent area is redefined\n");
-		dma_reserved_default_memory = rmem;
-	}
-#endif
-
-	rmem->ops = &rmem_dma_ops;
-	pr_info("Reserved memory: created DMA memory pool at %pa, size %ld MiB\n",
-		&rmem->base, (unsigned long)rmem->size / SZ_1M);
-	return 0;
-}
-
-static int __init dma_init_reserved_memory(void)
-{
-	const struct reserved_mem_ops *ops;
-	int ret;
-
-	if (!dma_reserved_default_memory)
-		return -ENOMEM;
-
-	ops = dma_reserved_default_memory->ops;
-
-	/*
-	 * We rely on rmem_dma_device_init() does not propagate error of
-	 * dma_assign_coherent_memory() for "NULL" device.
-	 */
-	ret = ops->device_init(dma_reserved_default_memory, NULL);
-
-	if (!ret) {
-		dma_coherent_default_memory = dma_reserved_default_memory->priv;
-		pr_info("DMA: default coherent area is set\n");
-	}
-
-	return ret;
-}
-
-core_initcall(dma_init_reserved_memory);
-
-RESERVEDMEM_OF_DECLARE(dma, "shared-dma-pool", rmem_dma_setup);
-#endif
diff --git a/drivers/base/dma-contiguous.c b/drivers/base/dma-contiguous.c
deleted file mode 100644
index d987dcd1bd56..000000000000
--- a/drivers/base/dma-contiguous.c
+++ /dev/null
@@ -1,278 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0+
-/*
- * Contiguous Memory Allocator for DMA mapping framework
- * Copyright (c) 2010-2011 by Samsung Electronics.
- * Written by:
- *	Marek Szyprowski <m.szyprowski@samsung.com>
- *	Michal Nazarewicz <mina86@mina86.com>
- */
-
-#define pr_fmt(fmt) "cma: " fmt
-
-#ifdef CONFIG_CMA_DEBUG
-#ifndef DEBUG
-#  define DEBUG
-#endif
-#endif
-
-#include <asm/page.h>
-#include <asm/dma-contiguous.h>
-
-#include <linux/memblock.h>
-#include <linux/err.h>
-#include <linux/sizes.h>
-#include <linux/dma-contiguous.h>
-#include <linux/cma.h>
-
-#ifdef CONFIG_CMA_SIZE_MBYTES
-#define CMA_SIZE_MBYTES CONFIG_CMA_SIZE_MBYTES
-#else
-#define CMA_SIZE_MBYTES 0
-#endif
-
-struct cma *dma_contiguous_default_area;
-
-/*
- * Default global CMA area size can be defined in kernel's .config.
- * This is useful mainly for distro maintainers to create a kernel
- * that works correctly for most supported systems.
- * The size can be set in bytes or as a percentage of the total memory
- * in the system.
- *
- * Users, who want to set the size of global CMA area for their system
- * should use cma= kernel parameter.
- */
-static const phys_addr_t size_bytes = (phys_addr_t)CMA_SIZE_MBYTES * SZ_1M;
-static phys_addr_t size_cmdline = -1;
-static phys_addr_t base_cmdline;
-static phys_addr_t limit_cmdline;
-
-static int __init early_cma(char *p)
-{
-	pr_debug("%s(%s)\n", __func__, p);
-	size_cmdline = memparse(p, &p);
-	if (*p != '@')
-		return 0;
-	base_cmdline = memparse(p + 1, &p);
-	if (*p != '-') {
-		limit_cmdline = base_cmdline + size_cmdline;
-		return 0;
-	}
-	limit_cmdline = memparse(p + 1, &p);
-
-	return 0;
-}
-early_param("cma", early_cma);
-
-#ifdef CONFIG_CMA_SIZE_PERCENTAGE
-
-static phys_addr_t __init __maybe_unused cma_early_percent_memory(void)
-{
-	struct memblock_region *reg;
-	unsigned long total_pages = 0;
-
-	/*
-	 * We cannot use memblock_phys_mem_size() here, because
-	 * memblock_analyze() has not been called yet.
-	 */
-	for_each_memblock(memory, reg)
-		total_pages += memblock_region_memory_end_pfn(reg) -
-			       memblock_region_memory_base_pfn(reg);
-
-	return (total_pages * CONFIG_CMA_SIZE_PERCENTAGE / 100) << PAGE_SHIFT;
-}
-
-#else
-
-static inline __maybe_unused phys_addr_t cma_early_percent_memory(void)
-{
-	return 0;
-}
-
-#endif
-
-/**
- * dma_contiguous_reserve() - reserve area(s) for contiguous memory handling
- * @limit: End address of the reserved memory (optional, 0 for any).
- *
- * This function reserves memory from early allocator. It should be
- * called by arch specific code once the early allocator (memblock or bootmem)
- * has been activated and all other subsystems have already allocated/reserved
- * memory.
- */
-void __init dma_contiguous_reserve(phys_addr_t limit)
-{
-	phys_addr_t selected_size = 0;
-	phys_addr_t selected_base = 0;
-	phys_addr_t selected_limit = limit;
-	bool fixed = false;
-
-	pr_debug("%s(limit %08lx)\n", __func__, (unsigned long)limit);
-
-	if (size_cmdline != -1) {
-		selected_size = size_cmdline;
-		selected_base = base_cmdline;
-		selected_limit = min_not_zero(limit_cmdline, limit);
-		if (base_cmdline + size_cmdline == limit_cmdline)
-			fixed = true;
-	} else {
-#ifdef CONFIG_CMA_SIZE_SEL_MBYTES
-		selected_size = size_bytes;
-#elif defined(CONFIG_CMA_SIZE_SEL_PERCENTAGE)
-		selected_size = cma_early_percent_memory();
-#elif defined(CONFIG_CMA_SIZE_SEL_MIN)
-		selected_size = min(size_bytes, cma_early_percent_memory());
-#elif defined(CONFIG_CMA_SIZE_SEL_MAX)
-		selected_size = max(size_bytes, cma_early_percent_memory());
-#endif
-	}
-
-	if (selected_size && !dma_contiguous_default_area) {
-		pr_debug("%s: reserving %ld MiB for global area\n", __func__,
-			 (unsigned long)selected_size / SZ_1M);
-
-		dma_contiguous_reserve_area(selected_size, selected_base,
-					    selected_limit,
-					    &dma_contiguous_default_area,
-					    fixed);
-	}
-}
-
-/**
- * dma_contiguous_reserve_area() - reserve custom contiguous area
- * @size: Size of the reserved area (in bytes),
- * @base: Base address of the reserved area optional, use 0 for any
- * @limit: End address of the reserved memory (optional, 0 for any).
- * @res_cma: Pointer to store the created cma region.
- * @fixed: hint about where to place the reserved area
- *
- * This function reserves memory from early allocator. It should be
- * called by arch specific code once the early allocator (memblock or bootmem)
- * has been activated and all other subsystems have already allocated/reserved
- * memory. This function allows to create custom reserved areas for specific
- * devices.
- *
- * If @fixed is true, reserve contiguous area at exactly @base.  If false,
- * reserve in range from @base to @limit.
- */
-int __init dma_contiguous_reserve_area(phys_addr_t size, phys_addr_t base,
-				       phys_addr_t limit, struct cma **res_cma,
-				       bool fixed)
-{
-	int ret;
-
-	ret = cma_declare_contiguous(base, size, limit, 0, 0, fixed,
-					"reserved", res_cma);
-	if (ret)
-		return ret;
-
-	/* Architecture specific contiguous memory fixup. */
-	dma_contiguous_early_fixup(cma_get_base(*res_cma),
-				cma_get_size(*res_cma));
-
-	return 0;
-}
-
-/**
- * dma_alloc_from_contiguous() - allocate pages from contiguous area
- * @dev:   Pointer to device for which the allocation is performed.
- * @count: Requested number of pages.
- * @align: Requested alignment of pages (in PAGE_SIZE order).
- * @gfp_mask: GFP flags to use for this allocation.
- *
- * This function allocates memory buffer for specified device. It uses
- * device specific contiguous memory area if available or the default
- * global one. Requires architecture specific dev_get_cma_area() helper
- * function.
- */
-struct page *dma_alloc_from_contiguous(struct device *dev, size_t count,
-				       unsigned int align, gfp_t gfp_mask)
-{
-	if (align > CONFIG_CMA_ALIGNMENT)
-		align = CONFIG_CMA_ALIGNMENT;
-
-	return cma_alloc(dev_get_cma_area(dev), count, align, gfp_mask);
-}
-
-/**
- * dma_release_from_contiguous() - release allocated pages
- * @dev:   Pointer to device for which the pages were allocated.
- * @pages: Allocated pages.
- * @count: Number of allocated pages.
- *
- * This function releases memory allocated by dma_alloc_from_contiguous().
- * It returns false when provided pages do not belong to contiguous area and
- * true otherwise.
- */
-bool dma_release_from_contiguous(struct device *dev, struct page *pages,
-				 int count)
-{
-	return cma_release(dev_get_cma_area(dev), pages, count);
-}
-
-/*
- * Support for reserved memory regions defined in device tree
- */
-#ifdef CONFIG_OF_RESERVED_MEM
-#include <linux/of.h>
-#include <linux/of_fdt.h>
-#include <linux/of_reserved_mem.h>
-
-#undef pr_fmt
-#define pr_fmt(fmt) fmt
-
-static int rmem_cma_device_init(struct reserved_mem *rmem, struct device *dev)
-{
-	dev_set_cma_area(dev, rmem->priv);
-	return 0;
-}
-
-static void rmem_cma_device_release(struct reserved_mem *rmem,
-				    struct device *dev)
-{
-	dev_set_cma_area(dev, NULL);
-}
-
-static const struct reserved_mem_ops rmem_cma_ops = {
-	.device_init	= rmem_cma_device_init,
-	.device_release = rmem_cma_device_release,
-};
-
-static int __init rmem_cma_setup(struct reserved_mem *rmem)
-{
-	phys_addr_t align = PAGE_SIZE << max(MAX_ORDER - 1, pageblock_order);
-	phys_addr_t mask = align - 1;
-	unsigned long node = rmem->fdt_node;
-	struct cma *cma;
-	int err;
-
-	if (!of_get_flat_dt_prop(node, "reusable", NULL) ||
-	    of_get_flat_dt_prop(node, "no-map", NULL))
-		return -EINVAL;
-
-	if ((rmem->base & mask) || (rmem->size & mask)) {
-		pr_err("Reserved memory: incorrect alignment of CMA region\n");
-		return -EINVAL;
-	}
-
-	err = cma_init_reserved_mem(rmem->base, rmem->size, 0, rmem->name, &cma);
-	if (err) {
-		pr_err("Reserved memory: unable to setup CMA region\n");
-		return err;
-	}
-	/* Architecture specific contiguous memory fixup. */
-	dma_contiguous_early_fixup(rmem->base, rmem->size);
-
-	if (of_get_flat_dt_prop(node, "linux,cma-default", NULL))
-		dma_contiguous_set_default(cma);
-
-	rmem->ops = &rmem_cma_ops;
-	rmem->priv = cma;
-
-	pr_info("Reserved memory: created CMA memory pool at %pa, size %ld MiB\n",
-		&rmem->base, (unsigned long)rmem->size / SZ_1M);
-
-	return 0;
-}
-RESERVEDMEM_OF_DECLARE(cma, "shared-dma-pool", rmem_cma_setup);
-#endif
diff --git a/drivers/base/dma-mapping.c b/drivers/base/dma-mapping.c
deleted file mode 100644
index f831a582209c..000000000000
--- a/drivers/base/dma-mapping.c
+++ /dev/null
@@ -1,345 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * drivers/base/dma-mapping.c - arch-independent dma-mapping routines
- *
- * Copyright (c) 2006  SUSE Linux Products GmbH
- * Copyright (c) 2006  Tejun Heo <teheo@suse.de>
- */
-
-#include <linux/acpi.h>
-#include <linux/dma-mapping.h>
-#include <linux/export.h>
-#include <linux/gfp.h>
-#include <linux/of_device.h>
-#include <linux/slab.h>
-#include <linux/vmalloc.h>
-
-/*
- * Managed DMA API
- */
-struct dma_devres {
-	size_t		size;
-	void		*vaddr;
-	dma_addr_t	dma_handle;
-	unsigned long	attrs;
-};
-
-static void dmam_release(struct device *dev, void *res)
-{
-	struct dma_devres *this = res;
-
-	dma_free_attrs(dev, this->size, this->vaddr, this->dma_handle,
-			this->attrs);
-}
-
-static int dmam_match(struct device *dev, void *res, void *match_data)
-{
-	struct dma_devres *this = res, *match = match_data;
-
-	if (this->vaddr == match->vaddr) {
-		WARN_ON(this->size != match->size ||
-			this->dma_handle != match->dma_handle);
-		return 1;
-	}
-	return 0;
-}
-
-/**
- * dmam_alloc_coherent - Managed dma_alloc_coherent()
- * @dev: Device to allocate coherent memory for
- * @size: Size of allocation
- * @dma_handle: Out argument for allocated DMA handle
- * @gfp: Allocation flags
- *
- * Managed dma_alloc_coherent().  Memory allocated using this function
- * will be automatically released on driver detach.
- *
- * RETURNS:
- * Pointer to allocated memory on success, NULL on failure.
- */
-void *dmam_alloc_coherent(struct device *dev, size_t size,
-			   dma_addr_t *dma_handle, gfp_t gfp)
-{
-	struct dma_devres *dr;
-	void *vaddr;
-
-	dr = devres_alloc(dmam_release, sizeof(*dr), gfp);
-	if (!dr)
-		return NULL;
-
-	vaddr = dma_alloc_coherent(dev, size, dma_handle, gfp);
-	if (!vaddr) {
-		devres_free(dr);
-		return NULL;
-	}
-
-	dr->vaddr = vaddr;
-	dr->dma_handle = *dma_handle;
-	dr->size = size;
-
-	devres_add(dev, dr);
-
-	return vaddr;
-}
-EXPORT_SYMBOL(dmam_alloc_coherent);
-
-/**
- * dmam_free_coherent - Managed dma_free_coherent()
- * @dev: Device to free coherent memory for
- * @size: Size of allocation
- * @vaddr: Virtual address of the memory to free
- * @dma_handle: DMA handle of the memory to free
- *
- * Managed dma_free_coherent().
- */
-void dmam_free_coherent(struct device *dev, size_t size, void *vaddr,
-			dma_addr_t dma_handle)
-{
-	struct dma_devres match_data = { size, vaddr, dma_handle };
-
-	dma_free_coherent(dev, size, vaddr, dma_handle);
-	WARN_ON(devres_destroy(dev, dmam_release, dmam_match, &match_data));
-}
-EXPORT_SYMBOL(dmam_free_coherent);
-
-/**
- * dmam_alloc_attrs - Managed dma_alloc_attrs()
- * @dev: Device to allocate non_coherent memory for
- * @size: Size of allocation
- * @dma_handle: Out argument for allocated DMA handle
- * @gfp: Allocation flags
- * @attrs: Flags in the DMA_ATTR_* namespace.
- *
- * Managed dma_alloc_attrs().  Memory allocated using this function will be
- * automatically released on driver detach.
- *
- * RETURNS:
- * Pointer to allocated memory on success, NULL on failure.
- */
-void *dmam_alloc_attrs(struct device *dev, size_t size, dma_addr_t *dma_handle,
-		gfp_t gfp, unsigned long attrs)
-{
-	struct dma_devres *dr;
-	void *vaddr;
-
-	dr = devres_alloc(dmam_release, sizeof(*dr), gfp);
-	if (!dr)
-		return NULL;
-
-	vaddr = dma_alloc_attrs(dev, size, dma_handle, gfp, attrs);
-	if (!vaddr) {
-		devres_free(dr);
-		return NULL;
-	}
-
-	dr->vaddr = vaddr;
-	dr->dma_handle = *dma_handle;
-	dr->size = size;
-	dr->attrs = attrs;
-
-	devres_add(dev, dr);
-
-	return vaddr;
-}
-EXPORT_SYMBOL(dmam_alloc_attrs);
-
-#ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT
-
-static void dmam_coherent_decl_release(struct device *dev, void *res)
-{
-	dma_release_declared_memory(dev);
-}
-
-/**
- * dmam_declare_coherent_memory - Managed dma_declare_coherent_memory()
- * @dev: Device to declare coherent memory for
- * @phys_addr: Physical address of coherent memory to be declared
- * @device_addr: Device address of coherent memory to be declared
- * @size: Size of coherent memory to be declared
- * @flags: Flags
- *
- * Managed dma_declare_coherent_memory().
- *
- * RETURNS:
- * 0 on success, -errno on failure.
- */
-int dmam_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
-				 dma_addr_t device_addr, size_t size, int flags)
-{
-	void *res;
-	int rc;
-
-	res = devres_alloc(dmam_coherent_decl_release, 0, GFP_KERNEL);
-	if (!res)
-		return -ENOMEM;
-
-	rc = dma_declare_coherent_memory(dev, phys_addr, device_addr, size,
-					 flags);
-	if (!rc)
-		devres_add(dev, res);
-	else
-		devres_free(res);
-
-	return rc;
-}
-EXPORT_SYMBOL(dmam_declare_coherent_memory);
-
-/**
- * dmam_release_declared_memory - Managed dma_release_declared_memory().
- * @dev: Device to release declared coherent memory for
- *
- * Managed dmam_release_declared_memory().
- */
-void dmam_release_declared_memory(struct device *dev)
-{
-	WARN_ON(devres_destroy(dev, dmam_coherent_decl_release, NULL, NULL));
-}
-EXPORT_SYMBOL(dmam_release_declared_memory);
-
-#endif
-
-/*
- * Create scatter-list for the already allocated DMA buffer.
- */
-int dma_common_get_sgtable(struct device *dev, struct sg_table *sgt,
-		 void *cpu_addr, dma_addr_t handle, size_t size)
-{
-	struct page *page = virt_to_page(cpu_addr);
-	int ret;
-
-	ret = sg_alloc_table(sgt, 1, GFP_KERNEL);
-	if (unlikely(ret))
-		return ret;
-
-	sg_set_page(sgt->sgl, page, PAGE_ALIGN(size), 0);
-	return 0;
-}
-EXPORT_SYMBOL(dma_common_get_sgtable);
-
-/*
- * Create userspace mapping for the DMA-coherent memory.
- */
-int dma_common_mmap(struct device *dev, struct vm_area_struct *vma,
-		    void *cpu_addr, dma_addr_t dma_addr, size_t size)
-{
-	int ret = -ENXIO;
-#ifndef CONFIG_ARCH_NO_COHERENT_DMA_MMAP
-	unsigned long user_count = vma_pages(vma);
-	unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT;
-	unsigned long off = vma->vm_pgoff;
-
-	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
-
-	if (dma_mmap_from_dev_coherent(dev, vma, cpu_addr, size, &ret))
-		return ret;
-
-	if (off < count && user_count <= (count - off))
-		ret = remap_pfn_range(vma, vma->vm_start,
-				      page_to_pfn(virt_to_page(cpu_addr)) + off,
-				      user_count << PAGE_SHIFT,
-				      vma->vm_page_prot);
-#endif	/* !CONFIG_ARCH_NO_COHERENT_DMA_MMAP */
-
-	return ret;
-}
-EXPORT_SYMBOL(dma_common_mmap);
-
-#ifdef CONFIG_MMU
-static struct vm_struct *__dma_common_pages_remap(struct page **pages,
-			size_t size, unsigned long vm_flags, pgprot_t prot,
-			const void *caller)
-{
-	struct vm_struct *area;
-
-	area = get_vm_area_caller(size, vm_flags, caller);
-	if (!area)
-		return NULL;
-
-	if (map_vm_area(area, prot, pages)) {
-		vunmap(area->addr);
-		return NULL;
-	}
-
-	return area;
-}
-
-/*
- * remaps an array of PAGE_SIZE pages into another vm_area
- * Cannot be used in non-sleeping contexts
- */
-void *dma_common_pages_remap(struct page **pages, size_t size,
-			unsigned long vm_flags, pgprot_t prot,
-			const void *caller)
-{
-	struct vm_struct *area;
-
-	area = __dma_common_pages_remap(pages, size, vm_flags, prot, caller);
-	if (!area)
-		return NULL;
-
-	area->pages = pages;
-
-	return area->addr;
-}
-
-/*
- * remaps an allocated contiguous region into another vm_area.
- * Cannot be used in non-sleeping contexts
- */
-
-void *dma_common_contiguous_remap(struct page *page, size_t size,
-			unsigned long vm_flags,
-			pgprot_t prot, const void *caller)
-{
-	int i;
-	struct page **pages;
-	struct vm_struct *area;
-
-	pages = kmalloc(sizeof(struct page *) << get_order(size), GFP_KERNEL);
-	if (!pages)
-		return NULL;
-
-	for (i = 0; i < (size >> PAGE_SHIFT); i++)
-		pages[i] = nth_page(page, i);
-
-	area = __dma_common_pages_remap(pages, size, vm_flags, prot, caller);
-
-	kfree(pages);
-
-	if (!area)
-		return NULL;
-	return area->addr;
-}
-
-/*
- * unmaps a range previously mapped by dma_common_*_remap
- */
-void dma_common_free_remap(void *cpu_addr, size_t size, unsigned long vm_flags)
-{
-	struct vm_struct *area = find_vm_area(cpu_addr);
-
-	if (!area || (area->flags & vm_flags) != vm_flags) {
-		WARN(1, "trying to free invalid coherent area: %p\n", cpu_addr);
-		return;
-	}
-
-	unmap_kernel_range((unsigned long)cpu_addr, PAGE_ALIGN(size));
-	vunmap(cpu_addr);
-}
-#endif
-
-/*
- * enables DMA API use for a device
- */
-int dma_configure(struct device *dev)
-{
-	if (dev->bus->dma_configure)
-		return dev->bus->dma_configure(dev);
-	return 0;
-}
-
-void dma_deconfigure(struct device *dev)
-{
-	of_dma_deconfigure(dev);
-	acpi_dma_deconfigure(dev);
-}