Marek Szyprowski | c64be2b | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Contiguous Memory Allocator for DMA mapping framework |
| 3 | * Copyright (c) 2010-2011 by Samsung Electronics. |
| 4 | * Written by: |
| 5 | * Marek Szyprowski <m.szyprowski@samsung.com> |
| 6 | * Michal Nazarewicz <mina86@mina86.com> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU General Public License as |
| 10 | * published by the Free Software Foundation; either version 2 of the |
| 11 | * License or (at your optional) any later version of the license. |
| 12 | */ |
| 13 | |
| 14 | #define pr_fmt(fmt) "cma: " fmt |
| 15 | |
| 16 | #ifdef CONFIG_CMA_DEBUG |
| 17 | #ifndef DEBUG |
| 18 | # define DEBUG |
| 19 | #endif |
| 20 | #endif |
| 21 | |
| 22 | #include <asm/page.h> |
| 23 | #include <asm/dma-contiguous.h> |
| 24 | |
| 25 | #include <linux/memblock.h> |
| 26 | #include <linux/err.h> |
Laurent Pinchart | 446c82f | 2012-10-18 09:29:44 +0200 | [diff] [blame] | 27 | #include <linux/sizes.h> |
Marek Szyprowski | c64be2b | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 28 | #include <linux/dma-contiguous.h> |
Joonsoo Kim | a254129 | 2014-08-06 16:05:25 -0700 | [diff] [blame] | 29 | #include <linux/cma.h> |
Marek Szyprowski | c64be2b | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 30 | |
| 31 | #ifdef CONFIG_CMA_SIZE_MBYTES |
| 32 | #define CMA_SIZE_MBYTES CONFIG_CMA_SIZE_MBYTES |
| 33 | #else |
| 34 | #define CMA_SIZE_MBYTES 0 |
| 35 | #endif |
| 36 | |
Joonsoo Kim | a254129 | 2014-08-06 16:05:25 -0700 | [diff] [blame] | 37 | struct cma *dma_contiguous_default_area; |
| 38 | |
Marek Szyprowski | c64be2b | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 39 | /* |
| 40 | * Default global CMA area size can be defined in kernel's .config. |
Michael Opdenacker | 7367880 | 2013-09-18 06:04:48 +0200 | [diff] [blame] | 41 | * This is useful mainly for distro maintainers to create a kernel |
Marek Szyprowski | c64be2b | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 42 | * that works correctly for most supported systems. |
| 43 | * The size can be set in bytes or as a percentage of the total memory |
| 44 | * in the system. |
| 45 | * |
| 46 | * Users, who want to set the size of global CMA area for their system |
| 47 | * should use cma= kernel parameter. |
| 48 | */ |
Tan Xiaojun | a785ce9 | 2015-09-24 11:27:47 +0800 | [diff] [blame] | 49 | static const phys_addr_t size_bytes = (phys_addr_t)CMA_SIZE_MBYTES * SZ_1M; |
Vitaly Andrianov | 4009793 | 2012-12-05 09:29:25 -0500 | [diff] [blame] | 50 | static phys_addr_t size_cmdline = -1; |
Akinobu Mita | 5ea3b1b | 2014-06-04 16:06:54 -0700 | [diff] [blame] | 51 | static phys_addr_t base_cmdline; |
| 52 | static phys_addr_t limit_cmdline; |
Marek Szyprowski | c64be2b | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 53 | |
| 54 | static int __init early_cma(char *p) |
| 55 | { |
| 56 | pr_debug("%s(%s)\n", __func__, p); |
| 57 | size_cmdline = memparse(p, &p); |
Akinobu Mita | 5ea3b1b | 2014-06-04 16:06:54 -0700 | [diff] [blame] | 58 | if (*p != '@') |
| 59 | return 0; |
| 60 | base_cmdline = memparse(p + 1, &p); |
| 61 | if (*p != '-') { |
| 62 | limit_cmdline = base_cmdline + size_cmdline; |
| 63 | return 0; |
| 64 | } |
| 65 | limit_cmdline = memparse(p + 1, &p); |
| 66 | |
Marek Szyprowski | c64be2b | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 67 | return 0; |
| 68 | } |
| 69 | early_param("cma", early_cma); |
| 70 | |
| 71 | #ifdef CONFIG_CMA_SIZE_PERCENTAGE |
| 72 | |
Vitaly Andrianov | 4009793 | 2012-12-05 09:29:25 -0500 | [diff] [blame] | 73 | static phys_addr_t __init __maybe_unused cma_early_percent_memory(void) |
Marek Szyprowski | c64be2b | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 74 | { |
| 75 | struct memblock_region *reg; |
| 76 | unsigned long total_pages = 0; |
| 77 | |
| 78 | /* |
| 79 | * We cannot use memblock_phys_mem_size() here, because |
| 80 | * memblock_analyze() has not been called yet. |
| 81 | */ |
| 82 | for_each_memblock(memory, reg) |
| 83 | total_pages += memblock_region_memory_end_pfn(reg) - |
| 84 | memblock_region_memory_base_pfn(reg); |
| 85 | |
| 86 | return (total_pages * CONFIG_CMA_SIZE_PERCENTAGE / 100) << PAGE_SHIFT; |
| 87 | } |
| 88 | |
| 89 | #else |
| 90 | |
Vitaly Andrianov | 4009793 | 2012-12-05 09:29:25 -0500 | [diff] [blame] | 91 | static inline __maybe_unused phys_addr_t cma_early_percent_memory(void) |
Marek Szyprowski | c64be2b | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 92 | { |
| 93 | return 0; |
| 94 | } |
| 95 | |
| 96 | #endif |
| 97 | |
| 98 | /** |
Marek Szyprowski | a254738 | 2013-07-29 14:31:45 +0200 | [diff] [blame] | 99 | * dma_contiguous_reserve() - reserve area(s) for contiguous memory handling |
Marek Szyprowski | c64be2b | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 100 | * @limit: End address of the reserved memory (optional, 0 for any). |
| 101 | * |
| 102 | * This function reserves memory from early allocator. It should be |
| 103 | * called by arch specific code once the early allocator (memblock or bootmem) |
| 104 | * has been activated and all other subsystems have already allocated/reserved |
| 105 | * memory. |
| 106 | */ |
| 107 | void __init dma_contiguous_reserve(phys_addr_t limit) |
| 108 | { |
Vitaly Andrianov | 4009793 | 2012-12-05 09:29:25 -0500 | [diff] [blame] | 109 | phys_addr_t selected_size = 0; |
Akinobu Mita | 5ea3b1b | 2014-06-04 16:06:54 -0700 | [diff] [blame] | 110 | phys_addr_t selected_base = 0; |
| 111 | phys_addr_t selected_limit = limit; |
| 112 | bool fixed = false; |
Marek Szyprowski | c64be2b | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 113 | |
| 114 | pr_debug("%s(limit %08lx)\n", __func__, (unsigned long)limit); |
| 115 | |
| 116 | if (size_cmdline != -1) { |
| 117 | selected_size = size_cmdline; |
Akinobu Mita | 5ea3b1b | 2014-06-04 16:06:54 -0700 | [diff] [blame] | 118 | selected_base = base_cmdline; |
| 119 | selected_limit = min_not_zero(limit_cmdline, limit); |
| 120 | if (base_cmdline + size_cmdline == limit_cmdline) |
| 121 | fixed = true; |
Marek Szyprowski | c64be2b | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 122 | } else { |
| 123 | #ifdef CONFIG_CMA_SIZE_SEL_MBYTES |
| 124 | selected_size = size_bytes; |
| 125 | #elif defined(CONFIG_CMA_SIZE_SEL_PERCENTAGE) |
| 126 | selected_size = cma_early_percent_memory(); |
| 127 | #elif defined(CONFIG_CMA_SIZE_SEL_MIN) |
| 128 | selected_size = min(size_bytes, cma_early_percent_memory()); |
| 129 | #elif defined(CONFIG_CMA_SIZE_SEL_MAX) |
| 130 | selected_size = max(size_bytes, cma_early_percent_memory()); |
| 131 | #endif |
| 132 | } |
| 133 | |
Marek Szyprowski | a254738 | 2013-07-29 14:31:45 +0200 | [diff] [blame] | 134 | if (selected_size && !dma_contiguous_default_area) { |
Marek Szyprowski | c64be2b | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 135 | pr_debug("%s: reserving %ld MiB for global area\n", __func__, |
Vitaly Andrianov | 4009793 | 2012-12-05 09:29:25 -0500 | [diff] [blame] | 136 | (unsigned long)selected_size / SZ_1M); |
Marek Szyprowski | c64be2b | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 137 | |
Akinobu Mita | 5ea3b1b | 2014-06-04 16:06:54 -0700 | [diff] [blame] | 138 | dma_contiguous_reserve_area(selected_size, selected_base, |
| 139 | selected_limit, |
| 140 | &dma_contiguous_default_area, |
| 141 | fixed); |
Marek Szyprowski | c64be2b | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 142 | } |
Akinobu Mita | 5ea3b1b | 2014-06-04 16:06:54 -0700 | [diff] [blame] | 143 | } |
Marek Szyprowski | c64be2b | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 144 | |
Joonsoo Kim | 3162bbd | 2014-08-06 16:05:19 -0700 | [diff] [blame] | 145 | /** |
| 146 | * dma_contiguous_reserve_area() - reserve custom contiguous area |
| 147 | * @size: Size of the reserved area (in bytes), |
| 148 | * @base: Base address of the reserved area optional, use 0 for any |
| 149 | * @limit: End address of the reserved memory (optional, 0 for any). |
| 150 | * @res_cma: Pointer to store the created cma region. |
| 151 | * @fixed: hint about where to place the reserved area |
| 152 | * |
| 153 | * This function reserves memory from early allocator. It should be |
| 154 | * called by arch specific code once the early allocator (memblock or bootmem) |
| 155 | * has been activated and all other subsystems have already allocated/reserved |
| 156 | * memory. This function allows to create custom reserved areas for specific |
| 157 | * devices. |
| 158 | * |
| 159 | * If @fixed is true, reserve contiguous area at exactly @base. If false, |
| 160 | * reserve in range from @base to @limit. |
| 161 | */ |
| 162 | int __init dma_contiguous_reserve_area(phys_addr_t size, phys_addr_t base, |
| 163 | phys_addr_t limit, struct cma **res_cma, |
| 164 | bool fixed) |
| 165 | { |
| 166 | int ret; |
| 167 | |
Joonsoo Kim | c1f733a | 2014-08-06 16:05:32 -0700 | [diff] [blame] | 168 | ret = cma_declare_contiguous(base, size, limit, 0, 0, fixed, res_cma); |
Joonsoo Kim | 3162bbd | 2014-08-06 16:05:19 -0700 | [diff] [blame] | 169 | if (ret) |
| 170 | return ret; |
| 171 | |
| 172 | /* Architecture specific contiguous memory fixup. */ |
Joonsoo Kim | a254129 | 2014-08-06 16:05:25 -0700 | [diff] [blame] | 173 | dma_contiguous_early_fixup(cma_get_base(*res_cma), |
| 174 | cma_get_size(*res_cma)); |
Joonsoo Kim | 3162bbd | 2014-08-06 16:05:19 -0700 | [diff] [blame] | 175 | |
| 176 | return 0; |
| 177 | } |
| 178 | |
Marek Szyprowski | c64be2b | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 179 | /** |
Joonsoo Kim | 3162bbd | 2014-08-06 16:05:19 -0700 | [diff] [blame] | 180 | * dma_alloc_from_contiguous() - allocate pages from contiguous area |
| 181 | * @dev: Pointer to device for which the allocation is performed. |
| 182 | * @count: Requested number of pages. |
| 183 | * @align: Requested alignment of pages (in PAGE_SIZE order). |
Marek Szyprowski | c64be2b | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 184 | * |
Joonsoo Kim | 3162bbd | 2014-08-06 16:05:19 -0700 | [diff] [blame] | 185 | * This function allocates memory buffer for specified device. It uses |
| 186 | * device specific contiguous memory area if available or the default |
| 187 | * global one. Requires architecture specific dev_get_cma_area() helper |
| 188 | * function. |
Marek Szyprowski | c64be2b | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 189 | */ |
Rohit Vaswani | 67a2e213 | 2015-10-22 13:32:11 -0700 | [diff] [blame] | 190 | struct page *dma_alloc_from_contiguous(struct device *dev, size_t count, |
Joonsoo Kim | 3162bbd | 2014-08-06 16:05:19 -0700 | [diff] [blame] | 191 | unsigned int align) |
Marek Szyprowski | c64be2b | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 192 | { |
Joonsoo Kim | 3162bbd | 2014-08-06 16:05:19 -0700 | [diff] [blame] | 193 | if (align > CONFIG_CMA_ALIGNMENT) |
| 194 | align = CONFIG_CMA_ALIGNMENT; |
| 195 | |
Joonsoo Kim | a254129 | 2014-08-06 16:05:25 -0700 | [diff] [blame] | 196 | return cma_alloc(dev_get_cma_area(dev), count, align); |
Marek Szyprowski | c64be2b | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 197 | } |
Joonsoo Kim | 3162bbd | 2014-08-06 16:05:19 -0700 | [diff] [blame] | 198 | |
| 199 | /** |
| 200 | * dma_release_from_contiguous() - release allocated pages |
| 201 | * @dev: Pointer to device for which the pages were allocated. |
| 202 | * @pages: Allocated pages. |
| 203 | * @count: Number of allocated pages. |
| 204 | * |
| 205 | * This function releases memory allocated by dma_alloc_from_contiguous(). |
| 206 | * It returns false when provided pages do not belong to contiguous area and |
| 207 | * true otherwise. |
| 208 | */ |
| 209 | bool dma_release_from_contiguous(struct device *dev, struct page *pages, |
| 210 | int count) |
| 211 | { |
Joonsoo Kim | a254129 | 2014-08-06 16:05:25 -0700 | [diff] [blame] | 212 | return cma_release(dev_get_cma_area(dev), pages, count); |
Joonsoo Kim | 3162bbd | 2014-08-06 16:05:19 -0700 | [diff] [blame] | 213 | } |
Marek Szyprowski | de9e14e | 2014-10-13 15:51:09 -0700 | [diff] [blame] | 214 | |
| 215 | /* |
| 216 | * Support for reserved memory regions defined in device tree |
| 217 | */ |
| 218 | #ifdef CONFIG_OF_RESERVED_MEM |
| 219 | #include <linux/of.h> |
| 220 | #include <linux/of_fdt.h> |
| 221 | #include <linux/of_reserved_mem.h> |
| 222 | |
| 223 | #undef pr_fmt |
| 224 | #define pr_fmt(fmt) fmt |
| 225 | |
Marek Szyprowski | 47f29df | 2014-10-29 14:50:29 -0700 | [diff] [blame] | 226 | static int rmem_cma_device_init(struct reserved_mem *rmem, struct device *dev) |
Marek Szyprowski | de9e14e | 2014-10-13 15:51:09 -0700 | [diff] [blame] | 227 | { |
| 228 | dev_set_cma_area(dev, rmem->priv); |
Marek Szyprowski | 47f29df | 2014-10-29 14:50:29 -0700 | [diff] [blame] | 229 | return 0; |
Marek Szyprowski | de9e14e | 2014-10-13 15:51:09 -0700 | [diff] [blame] | 230 | } |
| 231 | |
| 232 | static void rmem_cma_device_release(struct reserved_mem *rmem, |
| 233 | struct device *dev) |
| 234 | { |
| 235 | dev_set_cma_area(dev, NULL); |
| 236 | } |
| 237 | |
| 238 | static const struct reserved_mem_ops rmem_cma_ops = { |
| 239 | .device_init = rmem_cma_device_init, |
| 240 | .device_release = rmem_cma_device_release, |
| 241 | }; |
| 242 | |
| 243 | static int __init rmem_cma_setup(struct reserved_mem *rmem) |
| 244 | { |
| 245 | phys_addr_t align = PAGE_SIZE << max(MAX_ORDER - 1, pageblock_order); |
| 246 | phys_addr_t mask = align - 1; |
| 247 | unsigned long node = rmem->fdt_node; |
| 248 | struct cma *cma; |
| 249 | int err; |
| 250 | |
| 251 | if (!of_get_flat_dt_prop(node, "reusable", NULL) || |
| 252 | of_get_flat_dt_prop(node, "no-map", NULL)) |
| 253 | return -EINVAL; |
| 254 | |
| 255 | if ((rmem->base & mask) || (rmem->size & mask)) { |
| 256 | pr_err("Reserved memory: incorrect alignment of CMA region\n"); |
| 257 | return -EINVAL; |
| 258 | } |
| 259 | |
| 260 | err = cma_init_reserved_mem(rmem->base, rmem->size, 0, &cma); |
| 261 | if (err) { |
| 262 | pr_err("Reserved memory: unable to setup CMA region\n"); |
| 263 | return err; |
| 264 | } |
| 265 | /* Architecture specific contiguous memory fixup. */ |
| 266 | dma_contiguous_early_fixup(rmem->base, rmem->size); |
| 267 | |
| 268 | if (of_get_flat_dt_prop(node, "linux,cma-default", NULL)) |
| 269 | dma_contiguous_set_default(cma); |
| 270 | |
| 271 | rmem->ops = &rmem_cma_ops; |
| 272 | rmem->priv = cma; |
| 273 | |
| 274 | pr_info("Reserved memory: created CMA memory pool at %pa, size %ld MiB\n", |
| 275 | &rmem->base, (unsigned long)rmem->size / SZ_1M); |
| 276 | |
| 277 | return 0; |
| 278 | } |
| 279 | RESERVEDMEM_OF_DECLARE(cma, "shared-dma-pool", rmem_cma_setup); |
| 280 | #endif |