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>

1 files changed, 0 insertions, 278 deletions

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