arch/mips/loongson64/numa.c

Source file repositories/reference/linux-study-clean/arch/mips/loongson64/numa.c

File Facts

System
Linux kernel
Corpus path
arch/mips/loongson64/numa.c
Extension
.c
Size
4552 bytes
Lines
176
Domain
Architecture Layer
Bucket
arch/mips
Inferred role
Architecture Layer: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

for_each_online_node(col) {
			__node_distances[row][col] =
				compute_node_distance(row, col);
		}
	}
}

static void __init node_mem_init(unsigned int node)
{
	unsigned long node_addrspace_offset;
	unsigned long start_pfn, end_pfn;

	node_addrspace_offset = nid_to_addrbase(node);
	pr_info("Node%d's addrspace_offset is 0x%lx\n",
			node, node_addrspace_offset);

	get_pfn_range_for_nid(node, &start_pfn, &end_pfn);
	pr_info("Node%d: start_pfn=0x%lx, end_pfn=0x%lx\n",
		node, start_pfn, end_pfn);

	alloc_node_data(node);

	NODE_DATA(node)->node_start_pfn = start_pfn;
	NODE_DATA(node)->node_spanned_pages = end_pfn - start_pfn;

	if (node == 0) {
		/* kernel start address */
		unsigned long kernel_start_pfn = PFN_DOWN(__pa_symbol(&_text));

		/* kernel end address */
		unsigned long kernel_end_pfn = PFN_UP(__pa_symbol(&_end));

		/* used by finalize_initrd() */
		max_low_pfn = end_pfn;

		/* Reserve the kernel text/data/bss */
		memblock_reserve(kernel_start_pfn << PAGE_SHIFT,
				 ((kernel_end_pfn - kernel_start_pfn) << PAGE_SHIFT));

		/* Reserve 0xfe000000~0xffffffff for RS780E integrated GPU */
		if (node_end_pfn(0) >= (0xffffffff >> PAGE_SHIFT))
			memblock_reserve((node_addrspace_offset | 0xfe000000),
					 32 << 20);

		/* Reserve pfn range 0~node[0]->node_start_pfn */
		memblock_reserve(0, PAGE_SIZE * start_pfn);
		/* set nid for reserved memory on node 0 */
		memblock_set_node(0, 1ULL << 44, &memblock.reserved, 0);
	}
}

static __init void prom_meminit(void)
{
	unsigned int node, cpu, active_cpu = 0;

	cpu_node_probe();
	init_topology_matrix();

	for (node = 0; node < loongson_sysconf.nr_nodes; node++) {
		if (node_online(node)) {
			szmem(node);
			node_mem_init(node);
			cpumask_clear(&__node_cpumask[node]);
		}
	}
	max_low_pfn = PHYS_PFN(memblock_end_of_DRAM());

	for (cpu = 0; cpu < loongson_sysconf.nr_cpus; cpu++) {
		node = cpu / loongson_sysconf.cores_per_node;
		if (node >= num_online_nodes())
			node = 0;

		if (loongson_sysconf.reserved_cpus_mask & (1<<cpu))
			continue;

		cpumask_set_cpu(active_cpu, &__node_cpumask[node]);
		pr_info("NUMA: set cpumask cpu %d on node %d\n", active_cpu, node);

		active_cpu++;
	}
}

void __init arch_zone_limits_init(unsigned long *max_zone_pfns)
{
	max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
	max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
}

/* All PCI device belongs to logical Node-0 */
int pcibus_to_node(struct pci_bus *bus)

Annotation

Implementation Notes