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
44 		return -ENOMEM;  in early_init_dt_alloc_reserved_memory_arch()
58  * fdt_reserved_mem_save_node() - save fdt node for second pass initialization
70 	rmem->fdt_node = node;  in fdt_reserved_mem_save_node()
71 	rmem->name = uname;  in fdt_reserved_mem_save_node()
72 	rmem->base = base;  in fdt_reserved_mem_save_node()
73 	rmem->size = size;  in fdt_reserved_mem_save_node()
80  * __reserved_mem_alloc_size() - allocate reserved memory described by
81  *	'size', 'alignment'  and 'alloc-ranges' properties.
96 		return -EINVAL;  in __reserved_mem_alloc_size()
100 		return -EINVAL;  in __reserved_mem_alloc_size()
109 			return -EINVAL;  in __reserved_mem_alloc_size()
114 	nomap = of_get_flat_dt_prop(node, "no-map", NULL) != NULL;  in __reserved_mem_alloc_size()
118 	    && of_flat_dt_is_compatible(node, "shared-dma-pool")  in __reserved_mem_alloc_size()
123 	prop = of_get_flat_dt_prop(node, "alloc-ranges", &len);  in __reserved_mem_alloc_size()
127 			pr_err("invalid alloc-ranges property in '%s', skipping node.\n",  in __reserved_mem_alloc_size()
129 			return -EINVAL;  in __reserved_mem_alloc_size()
142 				pr_debug("allocated memory for '%s' node: base %pa, size %lu MiB\n",  in __reserved_mem_alloc_size()
147 			len -= t_len;  in __reserved_mem_alloc_size()
154 			pr_debug("allocated memory for '%s' node: base %pa, size %lu MiB\n",  in __reserved_mem_alloc_size()
159 		pr_err("failed to allocate memory for node '%s': size %lu MiB\n",  in __reserved_mem_alloc_size()
161 		return -ENOMEM;  in __reserved_mem_alloc_size()
174  * __reserved_mem_init_node() - call region specific reserved memory init code
180 	int ret = -ENOENT;  in __reserved_mem_init_node()
183 		reservedmem_of_init_fn initfn = i->data;  in __reserved_mem_init_node()
184 		const char *compat = i->compatible;  in __reserved_mem_init_node()
186 		if (!of_flat_dt_is_compatible(rmem->fdt_node, compat))  in __reserved_mem_init_node()
192 				rmem->name, compat);  in __reserved_mem_init_node()
203 	if (ra->base < rb->base)  in __rmem_cmp()
204 		return -1;  in __rmem_cmp()
206 	if (ra->base > rb->base)  in __rmem_cmp()
214 	if (ra->size < rb->size)  in __rmem_cmp()
215 		return -1;  in __rmem_cmp()
216 	if (ra->size > rb->size)  in __rmem_cmp()
231 	for (i = 0; i < reserved_mem_count - 1; i++) {  in __rmem_check_for_overlap()
237 		if (this->base + this->size > next->base) {  in __rmem_check_for_overlap()
240 			this_end = this->base + this->size;  in __rmem_check_for_overlap()
241 			next_end = next->base + next->size;  in __rmem_check_for_overlap()
242 			pr_err("OVERLAP DETECTED!\n%s (%pa--%pa) overlaps with %s (%pa--%pa)\n",  in __rmem_check_for_overlap()
243 			       this->name, &this->base, &this_end,  in __rmem_check_for_overlap()
244 			       next->name, &next->base, &next_end);  in __rmem_check_for_overlap()
250  * fdt_init_reserved_mem() - allocate and init all saved reserved memory regions
256 	/* check for overlapping reserved regions */  in fdt_init_reserved_mem()
261 		unsigned long node = rmem->fdt_node;  in fdt_init_reserved_mem()
267 		nomap = of_get_flat_dt_prop(node, "no-map", NULL) != NULL;  in fdt_init_reserved_mem()
272 			rmem->phandle = of_read_number(prop, len/4);  in fdt_init_reserved_mem()
274 		if (rmem->size == 0)  in fdt_init_reserved_mem()
275 			err = __reserved_mem_alloc_size(node, rmem->name,  in fdt_init_reserved_mem()
276 						 &rmem->base, &rmem->size);  in fdt_init_reserved_mem()
279 			if (err != 0 && err != -ENOENT) {  in fdt_init_reserved_mem()
281 					rmem->name);  in fdt_init_reserved_mem()
283 					memblock_clear_nomap(rmem->base, rmem->size);  in fdt_init_reserved_mem()
285 					memblock_phys_free(rmem->base,  in fdt_init_reserved_mem()
286 							   rmem->size);  in fdt_init_reserved_mem()
296 	if (!node->phandle)  in __find_rmem()
300 		if (reserved_mem[i].phandle == node->phandle)  in __find_rmem()
315  * of_reserved_mem_device_init_by_idx() - assign reserved memory region to
318  * @np:		Pointer to the device_node with 'reserved-memory' property
321  * This function assigns respective DMA-mapping operations based on reserved
322  * memory region specified by 'memory-region' property in @np node to the @dev
323  * device. When driver needs to use more than one reserved memory region, it
338 		return -EINVAL;  in of_reserved_mem_device_init_by_idx()
340 	target = of_parse_phandle(np, "memory-region", idx);  in of_reserved_mem_device_init_by_idx()
342 		return -ENODEV;  in of_reserved_mem_device_init_by_idx()
352 	if (!rmem || !rmem->ops || !rmem->ops->device_init)  in of_reserved_mem_device_init_by_idx()
353 		return -EINVAL;  in of_reserved_mem_device_init_by_idx()
357 		return -ENOMEM;  in of_reserved_mem_device_init_by_idx()
359 	ret = rmem->ops->device_init(rmem, dev);  in of_reserved_mem_device_init_by_idx()
361 		rd->dev = dev;  in of_reserved_mem_device_init_by_idx()
362 		rd->rmem = rmem;  in of_reserved_mem_device_init_by_idx()
365 		list_add(&rd->list, &of_rmem_assigned_device_list);  in of_reserved_mem_device_init_by_idx()
368 		dev_info(dev, "assigned reserved memory node %s\n", rmem->name);  in of_reserved_mem_device_init_by_idx()
378  * of_reserved_mem_device_init_by_name() - assign named reserved memory region
381  * @np: pointer to the device node with 'memory-region' property
382  * @name: name of the selected memory region
384  * Returns: 0 on success or a negative error-code on failure.
390 	int idx = of_property_match_string(np, "memory-region-names", name);  in of_reserved_mem_device_init_by_name()
397  * of_reserved_mem_device_release() - release reserved memory device structures
400  * This function releases structures allocated for memory region handling for
410 		if (rd->dev == dev)  in of_reserved_mem_device_release()
411 			list_move_tail(&rd->list, &release_list);  in of_reserved_mem_device_release()
416 		if (rd->rmem && rd->rmem->ops && rd->rmem->ops->device_release)  in of_reserved_mem_device_release()
417 			rd->rmem->ops->device_release(rd->rmem, dev);  in of_reserved_mem_device_release()
425  * of_reserved_mem_lookup() - acquire reserved_mem from a device node
426  * @np:		node pointer of the desired reserved-memory region
438 	if (!np->full_name)  in of_reserved_mem_lookup()
441 	name = kbasename(np->full_name);  in of_reserved_mem_lookup()