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3f0c8206 MS |
1 | /* |
2 | * Device tree based initialization code for reserved memory. | |
3 | * | |
ae1add24 | 4 | * Copyright (c) 2013, 2015 The Linux Foundation. All Rights Reserved. |
3f0c8206 MS |
5 | * Copyright (c) 2013,2014 Samsung Electronics Co., Ltd. |
6 | * http://www.samsung.com | |
7 | * Author: Marek Szyprowski <m.szyprowski@samsung.com> | |
8 | * Author: Josh Cartwright <joshc@codeaurora.org> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public License as | |
12 | * published by the Free Software Foundation; either version 2 of the | |
13 | * License or (at your optional) any later version of the license. | |
14 | */ | |
15 | ||
606ad42a RH |
16 | #define pr_fmt(fmt) "OF: reserved mem: " fmt |
17 | ||
3f0c8206 MS |
18 | #include <linux/err.h> |
19 | #include <linux/of.h> | |
20 | #include <linux/of_fdt.h> | |
21 | #include <linux/of_platform.h> | |
22 | #include <linux/mm.h> | |
23 | #include <linux/sizes.h> | |
24 | #include <linux/of_reserved_mem.h> | |
ae1add24 | 25 | #include <linux/sort.h> |
59ce4039 | 26 | #include <linux/slab.h> |
3f0c8206 MS |
27 | |
28 | #define MAX_RESERVED_REGIONS 16 | |
29 | static struct reserved_mem reserved_mem[MAX_RESERVED_REGIONS]; | |
30 | static int reserved_mem_count; | |
31 | ||
32 | #if defined(CONFIG_HAVE_MEMBLOCK) | |
33 | #include <linux/memblock.h> | |
34 | int __init __weak early_init_dt_alloc_reserved_memory_arch(phys_addr_t size, | |
35 | phys_addr_t align, phys_addr_t start, phys_addr_t end, bool nomap, | |
36 | phys_addr_t *res_base) | |
37 | { | |
e53b50c0 | 38 | phys_addr_t base; |
3f0c8206 MS |
39 | /* |
40 | * We use __memblock_alloc_base() because memblock_alloc_base() | |
41 | * panic()s on allocation failure. | |
42 | */ | |
e53b50c0 VM |
43 | end = !end ? MEMBLOCK_ALLOC_ANYWHERE : end; |
44 | base = __memblock_alloc_base(size, align, end); | |
3f0c8206 MS |
45 | if (!base) |
46 | return -ENOMEM; | |
47 | ||
48 | /* | |
49 | * Check if the allocated region fits in to start..end window | |
50 | */ | |
51 | if (base < start) { | |
52 | memblock_free(base, size); | |
53 | return -ENOMEM; | |
54 | } | |
55 | ||
56 | *res_base = base; | |
57 | if (nomap) | |
58 | return memblock_remove(base, size); | |
59 | return 0; | |
60 | } | |
61 | #else | |
62 | int __init __weak early_init_dt_alloc_reserved_memory_arch(phys_addr_t size, | |
63 | phys_addr_t align, phys_addr_t start, phys_addr_t end, bool nomap, | |
64 | phys_addr_t *res_base) | |
65 | { | |
66 | pr_err("Reserved memory not supported, ignoring region 0x%llx%s\n", | |
67 | size, nomap ? " (nomap)" : ""); | |
68 | return -ENOSYS; | |
69 | } | |
70 | #endif | |
71 | ||
72 | /** | |
73 | * res_mem_save_node() - save fdt node for second pass initialization | |
74 | */ | |
75 | void __init fdt_reserved_mem_save_node(unsigned long node, const char *uname, | |
76 | phys_addr_t base, phys_addr_t size) | |
77 | { | |
78 | struct reserved_mem *rmem = &reserved_mem[reserved_mem_count]; | |
79 | ||
80 | if (reserved_mem_count == ARRAY_SIZE(reserved_mem)) { | |
606ad42a | 81 | pr_err("not enough space all defined regions.\n"); |
3f0c8206 MS |
82 | return; |
83 | } | |
84 | ||
85 | rmem->fdt_node = node; | |
86 | rmem->name = uname; | |
87 | rmem->base = base; | |
88 | rmem->size = size; | |
89 | ||
90 | reserved_mem_count++; | |
91 | return; | |
92 | } | |
93 | ||
94 | /** | |
95 | * res_mem_alloc_size() - allocate reserved memory described by 'size', 'align' | |
96 | * and 'alloc-ranges' properties | |
97 | */ | |
98 | static int __init __reserved_mem_alloc_size(unsigned long node, | |
99 | const char *uname, phys_addr_t *res_base, phys_addr_t *res_size) | |
100 | { | |
101 | int t_len = (dt_root_addr_cells + dt_root_size_cells) * sizeof(__be32); | |
102 | phys_addr_t start = 0, end = 0; | |
103 | phys_addr_t base = 0, align = 0, size; | |
9d0c4dfe RH |
104 | int len; |
105 | const __be32 *prop; | |
3f0c8206 MS |
106 | int nomap; |
107 | int ret; | |
108 | ||
109 | prop = of_get_flat_dt_prop(node, "size", &len); | |
110 | if (!prop) | |
111 | return -EINVAL; | |
112 | ||
113 | if (len != dt_root_size_cells * sizeof(__be32)) { | |
606ad42a | 114 | pr_err("invalid size property in '%s' node.\n", uname); |
3f0c8206 MS |
115 | return -EINVAL; |
116 | } | |
117 | size = dt_mem_next_cell(dt_root_size_cells, &prop); | |
118 | ||
119 | nomap = of_get_flat_dt_prop(node, "no-map", NULL) != NULL; | |
120 | ||
121 | prop = of_get_flat_dt_prop(node, "alignment", &len); | |
122 | if (prop) { | |
123 | if (len != dt_root_addr_cells * sizeof(__be32)) { | |
606ad42a | 124 | pr_err("invalid alignment property in '%s' node.\n", |
3f0c8206 MS |
125 | uname); |
126 | return -EINVAL; | |
127 | } | |
128 | align = dt_mem_next_cell(dt_root_addr_cells, &prop); | |
129 | } | |
130 | ||
1cc8e345 | 131 | /* Need adjust the alignment to satisfy the CMA requirement */ |
7d482813 J |
132 | if (IS_ENABLED(CONFIG_CMA) |
133 | && of_flat_dt_is_compatible(node, "shared-dma-pool") | |
134 | && of_get_flat_dt_prop(node, "reusable", NULL) | |
aaaab56d SR |
135 | && !of_get_flat_dt_prop(node, "no-map", NULL)) { |
136 | unsigned long order = | |
137 | max_t(unsigned long, MAX_ORDER - 1, pageblock_order); | |
138 | ||
139 | align = max(align, (phys_addr_t)PAGE_SIZE << order); | |
140 | } | |
1cc8e345 | 141 | |
3f0c8206 MS |
142 | prop = of_get_flat_dt_prop(node, "alloc-ranges", &len); |
143 | if (prop) { | |
144 | ||
145 | if (len % t_len != 0) { | |
606ad42a | 146 | pr_err("invalid alloc-ranges property in '%s', skipping node.\n", |
3f0c8206 MS |
147 | uname); |
148 | return -EINVAL; | |
149 | } | |
150 | ||
151 | base = 0; | |
152 | ||
153 | while (len > 0) { | |
154 | start = dt_mem_next_cell(dt_root_addr_cells, &prop); | |
155 | end = start + dt_mem_next_cell(dt_root_size_cells, | |
156 | &prop); | |
157 | ||
158 | ret = early_init_dt_alloc_reserved_memory_arch(size, | |
159 | align, start, end, nomap, &base); | |
160 | if (ret == 0) { | |
606ad42a | 161 | pr_debug("allocated memory for '%s' node: base %pa, size %ld MiB\n", |
3f0c8206 MS |
162 | uname, &base, |
163 | (unsigned long)size / SZ_1M); | |
164 | break; | |
165 | } | |
166 | len -= t_len; | |
167 | } | |
168 | ||
169 | } else { | |
170 | ret = early_init_dt_alloc_reserved_memory_arch(size, align, | |
171 | 0, 0, nomap, &base); | |
172 | if (ret == 0) | |
606ad42a | 173 | pr_debug("allocated memory for '%s' node: base %pa, size %ld MiB\n", |
3f0c8206 MS |
174 | uname, &base, (unsigned long)size / SZ_1M); |
175 | } | |
176 | ||
177 | if (base == 0) { | |
606ad42a | 178 | pr_info("failed to allocate memory for node '%s'\n", uname); |
3f0c8206 MS |
179 | return -ENOMEM; |
180 | } | |
181 | ||
182 | *res_base = base; | |
183 | *res_size = size; | |
184 | ||
185 | return 0; | |
186 | } | |
187 | ||
f618c470 MS |
188 | static const struct of_device_id __rmem_of_table_sentinel |
189 | __used __section(__reservedmem_of_table_end); | |
190 | ||
191 | /** | |
192 | * res_mem_init_node() - call region specific reserved memory init code | |
193 | */ | |
194 | static int __init __reserved_mem_init_node(struct reserved_mem *rmem) | |
195 | { | |
196 | extern const struct of_device_id __reservedmem_of_table[]; | |
197 | const struct of_device_id *i; | |
198 | ||
199 | for (i = __reservedmem_of_table; i < &__rmem_of_table_sentinel; i++) { | |
200 | reservedmem_of_init_fn initfn = i->data; | |
201 | const char *compat = i->compatible; | |
202 | ||
203 | if (!of_flat_dt_is_compatible(rmem->fdt_node, compat)) | |
204 | continue; | |
205 | ||
9dd31075 | 206 | if (initfn(rmem) == 0) { |
606ad42a | 207 | pr_info("initialized node %s, compatible id %s\n", |
f618c470 MS |
208 | rmem->name, compat); |
209 | return 0; | |
210 | } | |
211 | } | |
212 | return -ENOENT; | |
213 | } | |
214 | ||
ae1add24 MH |
215 | static int __init __rmem_cmp(const void *a, const void *b) |
216 | { | |
217 | const struct reserved_mem *ra = a, *rb = b; | |
218 | ||
9eb8cd2b ME |
219 | if (ra->base < rb->base) |
220 | return -1; | |
221 | ||
222 | if (ra->base > rb->base) | |
223 | return 1; | |
224 | ||
225 | return 0; | |
ae1add24 MH |
226 | } |
227 | ||
228 | static void __init __rmem_check_for_overlap(void) | |
229 | { | |
230 | int i; | |
231 | ||
232 | if (reserved_mem_count < 2) | |
233 | return; | |
234 | ||
235 | sort(reserved_mem, reserved_mem_count, sizeof(reserved_mem[0]), | |
236 | __rmem_cmp, NULL); | |
237 | for (i = 0; i < reserved_mem_count - 1; i++) { | |
238 | struct reserved_mem *this, *next; | |
239 | ||
240 | this = &reserved_mem[i]; | |
241 | next = &reserved_mem[i + 1]; | |
242 | if (!(this->base && next->base)) | |
243 | continue; | |
244 | if (this->base + this->size > next->base) { | |
245 | phys_addr_t this_end, next_end; | |
246 | ||
247 | this_end = this->base + this->size; | |
248 | next_end = next->base + next->size; | |
606ad42a | 249 | pr_err("OVERLAP DETECTED!\n%s (%pa--%pa) overlaps with %s (%pa--%pa)\n", |
85a1c77f ME |
250 | this->name, &this->base, &this_end, |
251 | next->name, &next->base, &next_end); | |
ae1add24 MH |
252 | } |
253 | } | |
254 | } | |
255 | ||
3f0c8206 MS |
256 | /** |
257 | * fdt_init_reserved_mem - allocate and init all saved reserved memory regions | |
258 | */ | |
259 | void __init fdt_init_reserved_mem(void) | |
260 | { | |
261 | int i; | |
ae1add24 MH |
262 | |
263 | /* check for overlapping reserved regions */ | |
264 | __rmem_check_for_overlap(); | |
265 | ||
3f0c8206 MS |
266 | for (i = 0; i < reserved_mem_count; i++) { |
267 | struct reserved_mem *rmem = &reserved_mem[i]; | |
268 | unsigned long node = rmem->fdt_node; | |
9dcfee01 MS |
269 | int len; |
270 | const __be32 *prop; | |
3f0c8206 MS |
271 | int err = 0; |
272 | ||
9dcfee01 MS |
273 | prop = of_get_flat_dt_prop(node, "phandle", &len); |
274 | if (!prop) | |
275 | prop = of_get_flat_dt_prop(node, "linux,phandle", &len); | |
276 | if (prop) | |
277 | rmem->phandle = of_read_number(prop, len/4); | |
278 | ||
3f0c8206 MS |
279 | if (rmem->size == 0) |
280 | err = __reserved_mem_alloc_size(node, rmem->name, | |
281 | &rmem->base, &rmem->size); | |
f618c470 MS |
282 | if (err == 0) |
283 | __reserved_mem_init_node(rmem); | |
3f0c8206 MS |
284 | } |
285 | } | |
9dcfee01 MS |
286 | |
287 | static inline struct reserved_mem *__find_rmem(struct device_node *node) | |
288 | { | |
289 | unsigned int i; | |
290 | ||
291 | if (!node->phandle) | |
292 | return NULL; | |
293 | ||
294 | for (i = 0; i < reserved_mem_count; i++) | |
295 | if (reserved_mem[i].phandle == node->phandle) | |
296 | return &reserved_mem[i]; | |
297 | return NULL; | |
298 | } | |
299 | ||
59ce4039 MS |
300 | struct rmem_assigned_device { |
301 | struct device *dev; | |
302 | struct reserved_mem *rmem; | |
303 | struct list_head list; | |
304 | }; | |
305 | ||
306 | static LIST_HEAD(of_rmem_assigned_device_list); | |
307 | static DEFINE_MUTEX(of_rmem_assigned_device_mutex); | |
308 | ||
9dcfee01 | 309 | /** |
59ce4039 MS |
310 | * of_reserved_mem_device_init_by_idx() - assign reserved memory region to |
311 | * given device | |
312 | * @dev: Pointer to the device to configure | |
313 | * @np: Pointer to the device_node with 'reserved-memory' property | |
314 | * @idx: Index of selected region | |
9dcfee01 | 315 | * |
59ce4039 MS |
316 | * This function assigns respective DMA-mapping operations based on reserved |
317 | * memory region specified by 'memory-region' property in @np node to the @dev | |
318 | * device. When driver needs to use more than one reserved memory region, it | |
319 | * should allocate child devices and initialize regions by name for each of | |
320 | * child device. | |
321 | * | |
322 | * Returns error code or zero on success. | |
9dcfee01 | 323 | */ |
59ce4039 MS |
324 | int of_reserved_mem_device_init_by_idx(struct device *dev, |
325 | struct device_node *np, int idx) | |
9dcfee01 | 326 | { |
59ce4039 MS |
327 | struct rmem_assigned_device *rd; |
328 | struct device_node *target; | |
9dcfee01 | 329 | struct reserved_mem *rmem; |
47f29df7 | 330 | int ret; |
9dcfee01 | 331 | |
59ce4039 MS |
332 | if (!np || !dev) |
333 | return -EINVAL; | |
334 | ||
335 | target = of_parse_phandle(np, "memory-region", idx); | |
336 | if (!target) | |
9f5a802b | 337 | return -ENODEV; |
9dcfee01 | 338 | |
59ce4039 MS |
339 | rmem = __find_rmem(target); |
340 | of_node_put(target); | |
9dcfee01 MS |
341 | |
342 | if (!rmem || !rmem->ops || !rmem->ops->device_init) | |
47f29df7 MS |
343 | return -EINVAL; |
344 | ||
59ce4039 MS |
345 | rd = kmalloc(sizeof(struct rmem_assigned_device), GFP_KERNEL); |
346 | if (!rd) | |
347 | return -ENOMEM; | |
348 | ||
47f29df7 | 349 | ret = rmem->ops->device_init(rmem, dev); |
59ce4039 MS |
350 | if (ret == 0) { |
351 | rd->dev = dev; | |
352 | rd->rmem = rmem; | |
353 | ||
354 | mutex_lock(&of_rmem_assigned_device_mutex); | |
355 | list_add(&rd->list, &of_rmem_assigned_device_list); | |
356 | mutex_unlock(&of_rmem_assigned_device_mutex); | |
357 | ||
47f29df7 | 358 | dev_info(dev, "assigned reserved memory node %s\n", rmem->name); |
59ce4039 MS |
359 | } else { |
360 | kfree(rd); | |
361 | } | |
9dcfee01 | 362 | |
47f29df7 | 363 | return ret; |
9dcfee01 | 364 | } |
59ce4039 | 365 | EXPORT_SYMBOL_GPL(of_reserved_mem_device_init_by_idx); |
9dcfee01 MS |
366 | |
367 | /** | |
368 | * of_reserved_mem_device_release() - release reserved memory device structures | |
59ce4039 | 369 | * @dev: Pointer to the device to deconfigure |
9dcfee01 MS |
370 | * |
371 | * This function releases structures allocated for memory region handling for | |
372 | * the given device. | |
373 | */ | |
374 | void of_reserved_mem_device_release(struct device *dev) | |
375 | { | |
59ce4039 MS |
376 | struct rmem_assigned_device *rd; |
377 | struct reserved_mem *rmem = NULL; | |
378 | ||
379 | mutex_lock(&of_rmem_assigned_device_mutex); | |
380 | list_for_each_entry(rd, &of_rmem_assigned_device_list, list) { | |
381 | if (rd->dev == dev) { | |
382 | rmem = rd->rmem; | |
383 | list_del(&rd->list); | |
384 | kfree(rd); | |
385 | break; | |
386 | } | |
387 | } | |
388 | mutex_unlock(&of_rmem_assigned_device_mutex); | |
9dcfee01 MS |
389 | |
390 | if (!rmem || !rmem->ops || !rmem->ops->device_release) | |
391 | return; | |
392 | ||
393 | rmem->ops->device_release(rmem, dev); | |
394 | } | |
615fde79 | 395 | EXPORT_SYMBOL_GPL(of_reserved_mem_device_release); |