1 // SPDX-License-Identifier: GPL-2.0
13 #define FAKE_NODE_MIN_HASH_MASK	(~(FAKE_NODE_MIN_SIZE - 1UL))
28 	for (i = 0; i < mi->nr_blks; i++)  in emu_find_memblk_by_nid()
29 		if (mi->blk[i].nid == nid)  in emu_find_memblk_by_nid()
31 	return -ENOENT;  in emu_find_memblk_by_nid()
45  * Sets up nid to range from @start to @end.  The return value is -errno if
52 	struct numa_memblk *eb = &ei->blk[ei->nr_blks];  in emu_setup_memblk()
53 	struct numa_memblk *pb = &pi->blk[phys_blk];  in emu_setup_memblk()
55 	if (ei->nr_blks >= NR_NODE_MEMBLKS) {  in emu_setup_memblk()
57 		return -EINVAL;  in emu_setup_memblk()
60 	ei->nr_blks++;  in emu_setup_memblk()
61 	eb->start = pb->start;  in emu_setup_memblk()
62 	eb->end = pb->start + size;  in emu_setup_memblk()
63 	eb->nid = nid;  in emu_setup_memblk()
66 		emu_nid_to_phys[nid] = pb->nid;  in emu_setup_memblk()
68 	pb->start += size;  in emu_setup_memblk()
69 	if (pb->start >= pb->end) {  in emu_setup_memblk()
70 		WARN_ON_ONCE(pb->start > pb->end);  in emu_setup_memblk()
74 	printk(KERN_INFO "Faking node %d at [mem %#018Lx-%#018Lx] (%LuMB)\n",  in emu_setup_memblk()
75 	       nid, eb->start, eb->end - 1, (eb->end - eb->start) >> 20);  in emu_setup_memblk()
80  * Sets up nr_nodes fake nodes interleaved over physical nodes ranging from addr
96 		return -1;  in split_nodes_interleave()
107 	size = max_addr - addr - mem_hole_size(addr, max_addr);  in split_nodes_interleave()
121 		return -1;  in split_nodes_interleave()
139 			start = pi->blk[phys_blk].start;  in split_nodes_interleave()
140 			limit = pi->blk[phys_blk].end;  in split_nodes_interleave()
148 			 * non-reserved memory is less than the per-node size.  in split_nodes_interleave()
150 			while (end - start - mem_hole_size(start, end) < size) {  in split_nodes_interleave()
160 			 * non-reserved memory in ZONE_DMA32 for the next node,  in split_nodes_interleave()
163 			if (end < dma32_end && dma32_end - end -  in split_nodes_interleave()
168 			 * If there won't be enough non-reserved memory for the  in split_nodes_interleave()
172 			if (limit - end - mem_hole_size(end, limit) < size)  in split_nodes_interleave()
177 					       min(end, limit) - start);  in split_nodes_interleave()
187  * non-reserved memory or `max_addr' is reached.
193 	while (end - start - mem_hole_size(start, end) < size) {  in find_end_of_node()
209 	return PFN_PHYS((max_pfn - base_pfn - hole_pfns) / nr_nodes);  in uniform_size()
213  * Sets up fake nodes of `size' interleaved over physical nodes ranging from
229 		return -1;  in split_nodes_size_interleave_uniform()
233 	 * nr_nodes, in the non-uniform case, ignore the passed in  in split_nodes_size_interleave_uniform()
238 	 * capacity, i.e. ignore holes. In the non-uniform case account  in split_nodes_size_interleave_uniform()
245 		node_set(pblk->nid, physnode_mask);  in split_nodes_size_interleave_uniform()
287 			start = pi->blk[phys_blk].start;  in split_nodes_size_interleave_uniform()
288 			limit = pi->blk[phys_blk].end;  in split_nodes_size_interleave_uniform()
296 			 * non-reserved memory in ZONE_DMA32 for the next node,  in split_nodes_size_interleave_uniform()
299 			if (end < dma32_end && dma32_end - end -  in split_nodes_size_interleave_uniform()
304 			 * If there won't be enough non-reserved memory for the  in split_nodes_size_interleave_uniform()
308 			if ((limit - end - mem_hole_size(end, limit) < size)  in split_nodes_size_interleave_uniform()
314 					       min(end, limit) - start);  in split_nodes_size_interleave_uniform()
347  * numa_emulation - Emulate NUMA nodes
358  * - @numa_meminfo is updated to reflect the emulated nodes.
360  * - __apicid_to_node[] is updated such that APIC IDs are mapped to the
363  * - NUMA distance table is rebuilt to represent distances between emulated
367  * - emu_nid_to_phys[] reflects how emulated nodes are mapped to physical
393 	 * If the numa=fake command-line contains a 'M' or 'G', it represents  in numa_emulation()
403 		ret = -1;  in numa_emulation()
421 				ret = -1;  in numa_emulation()