1 // SPDX-License-Identifier: GPL-2.0+
3  * Device tree based initialization code for reserved memory.
5  * Copyright (c) 2013, 2015 The Linux Foundation. All Rights Reserved.
12 #define pr_fmt(fmt)	"OF: reserved mem: " fmt
43 		return -ENOMEM;  in early_init_dt_alloc_reserved_memory_arch()
57  * fdt_reserved_mem_save_node() - save fdt node for second pass initialization
69 	rmem->fdt_node = node;  in fdt_reserved_mem_save_node()
70 	rmem->name = uname;  in fdt_reserved_mem_save_node()
71 	rmem->base = base;  in fdt_reserved_mem_save_node()
72 	rmem->size = size;  in fdt_reserved_mem_save_node()
79  * __reserved_mem_alloc_size() - allocate reserved memory described by
80  *	'size', 'alignment'  and 'alloc-ranges' properties.
95 		return -EINVAL;  in __reserved_mem_alloc_size()
99 		return -EINVAL;  in __reserved_mem_alloc_size()
108 			return -EINVAL;  in __reserved_mem_alloc_size()
113 	nomap = of_get_flat_dt_prop(node, "no-map", NULL) != NULL;  in __reserved_mem_alloc_size()
117 	    && of_flat_dt_is_compatible(node, "shared-dma-pool")  in __reserved_mem_alloc_size()
121 			max_t(unsigned long, MAX_ORDER - 1, pageblock_order);  in __reserved_mem_alloc_size()
126 	prop = of_get_flat_dt_prop(node, "alloc-ranges", &len);  in __reserved_mem_alloc_size()
130 			pr_err("invalid alloc-ranges property in '%s', skipping node.\n",  in __reserved_mem_alloc_size()
132 			return -EINVAL;  in __reserved_mem_alloc_size()
145 				pr_debug("allocated memory for '%s' node: base %pa, size %lu MiB\n",  in __reserved_mem_alloc_size()
150 			len -= t_len;  in __reserved_mem_alloc_size()
157 			pr_debug("allocated memory for '%s' node: base %pa, size %lu MiB\n",  in __reserved_mem_alloc_size()
162 		pr_info("failed to allocate memory for node '%s'\n", uname);  in __reserved_mem_alloc_size()
163 		return -ENOMEM;  in __reserved_mem_alloc_size()
176  * __reserved_mem_init_node() - call region specific reserved memory init code
182 	int ret = -ENOENT;  in __reserved_mem_init_node()
185 		reservedmem_of_init_fn initfn = i->data;  in __reserved_mem_init_node()
186 		const char *compat = i->compatible;  in __reserved_mem_init_node()
188 		if (!of_flat_dt_is_compatible(rmem->fdt_node, compat))  in __reserved_mem_init_node()
194 				rmem->name, compat);  in __reserved_mem_init_node()
205 	if (ra->base < rb->base)  in __rmem_cmp()
206 		return -1;  in __rmem_cmp()
208 	if (ra->base > rb->base)  in __rmem_cmp()
216 	if (ra->size < rb->size)  in __rmem_cmp()
217 		return -1;  in __rmem_cmp()
218 	if (ra->size > rb->size)  in __rmem_cmp()
233 	for (i = 0; i < reserved_mem_count - 1; i++) {  in __rmem_check_for_overlap()
239 		if (this->base + this->size > next->base) {  in __rmem_check_for_overlap()
242 			this_end = this->base + this->size;  in __rmem_check_for_overlap()
243 			next_end = next->base + next->size;  in __rmem_check_for_overlap()
244 			pr_err("OVERLAP DETECTED!\n%s (%pa--%pa) overlaps with %s (%pa--%pa)\n",  in __rmem_check_for_overlap()
245 			       this->name, &this->base, &this_end,  in __rmem_check_for_overlap()
246 			       next->name, &next->base, &next_end);  in __rmem_check_for_overlap()
252  * fdt_init_reserved_mem() - allocate and init all saved reserved memory regions
258 	/* check for overlapping reserved regions */  in fdt_init_reserved_mem()
263 		unsigned long node = rmem->fdt_node;  in fdt_init_reserved_mem()
269 		nomap = of_get_flat_dt_prop(node, "no-map", NULL) != NULL;  in fdt_init_reserved_mem()
274 			rmem->phandle = of_read_number(prop, len/4);  in fdt_init_reserved_mem()
276 		if (rmem->size == 0)  in fdt_init_reserved_mem()
277 			err = __reserved_mem_alloc_size(node, rmem->name,  in fdt_init_reserved_mem()
278 						 &rmem->base, &rmem->size);  in fdt_init_reserved_mem()
281 			if (err != 0 && err != -ENOENT) {  in fdt_init_reserved_mem()
283 					rmem->name);  in fdt_init_reserved_mem()
285 					memblock_clear_nomap(rmem->base, rmem->size);  in fdt_init_reserved_mem()
287 					memblock_free(rmem->base, rmem->size);  in fdt_init_reserved_mem()
297 	if (!node->phandle)  in __find_rmem()
301 		if (reserved_mem[i].phandle == node->phandle)  in __find_rmem()
316  * of_reserved_mem_device_init_by_idx() - assign reserved memory region to
319  * @np:		Pointer to the device_node with 'reserved-memory' property
322  * This function assigns respective DMA-mapping operations based on reserved
323  * memory region specified by 'memory-region' property in @np node to the @dev
324  * device. When driver needs to use more than one reserved memory region, it
339 		return -EINVAL;  in of_reserved_mem_device_init_by_idx()
341 	target = of_parse_phandle(np, "memory-region", idx);  in of_reserved_mem_device_init_by_idx()
343 		return -ENODEV;  in of_reserved_mem_device_init_by_idx()
353 	if (!rmem || !rmem->ops || !rmem->ops->device_init)  in of_reserved_mem_device_init_by_idx()
354 		return -EINVAL;  in of_reserved_mem_device_init_by_idx()
358 		return -ENOMEM;  in of_reserved_mem_device_init_by_idx()
360 	ret = rmem->ops->device_init(rmem, dev);  in of_reserved_mem_device_init_by_idx()
362 		rd->dev = dev;  in of_reserved_mem_device_init_by_idx()
363 		rd->rmem = rmem;  in of_reserved_mem_device_init_by_idx()
366 		list_add(&rd->list, &of_rmem_assigned_device_list);  in of_reserved_mem_device_init_by_idx()
369 		dev_info(dev, "assigned reserved memory node %s\n", rmem->name);  in of_reserved_mem_device_init_by_idx()
379  * of_reserved_mem_device_init_by_name() - assign named reserved memory region
382  * @np: pointer to the device node with 'memory-region' property
383  * @name: name of the selected memory region
385  * Returns: 0 on success or a negative error-code on failure.
391 	int idx = of_property_match_string(np, "memory-region-names", name);  in of_reserved_mem_device_init_by_name()
398  * of_reserved_mem_device_release() - release reserved memory device structures
401  * This function releases structures allocated for memory region handling for
411 		if (rd->dev == dev)  in of_reserved_mem_device_release()
412 			list_move_tail(&rd->list, &release_list);  in of_reserved_mem_device_release()
417 		if (rd->rmem && rd->rmem->ops && rd->rmem->ops->device_release)  in of_reserved_mem_device_release()
418 			rd->rmem->ops->device_release(rd->rmem, dev);  in of_reserved_mem_device_release()
426  * of_reserved_mem_lookup() - acquire reserved_mem from a device node
427  * @np:		node pointer of the desired reserved-memory region
439 	if (!np->full_name)  in of_reserved_mem_lookup()
442 	name = kbasename(np->full_name);  in of_reserved_mem_lookup()