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183 lines
3.9 KiB
183 lines
3.9 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* AMD NUMA support. |
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* Discover the memory map and associated nodes. |
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* |
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* This version reads it directly from the AMD northbridge. |
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* |
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* Copyright 2002,2003 Andi Kleen, SuSE Labs. |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/init.h> |
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#include <linux/string.h> |
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#include <linux/nodemask.h> |
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#include <linux/memblock.h> |
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#include <asm/io.h> |
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#include <linux/pci_ids.h> |
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#include <linux/acpi.h> |
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#include <asm/types.h> |
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#include <asm/mmzone.h> |
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#include <asm/proto.h> |
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#include <asm/e820/api.h> |
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#include <asm/pci-direct.h> |
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#include <asm/numa.h> |
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#include <asm/mpspec.h> |
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#include <asm/apic.h> |
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#include <asm/amd_nb.h> |
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static unsigned char __initdata nodeids[8]; |
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static __init int find_northbridge(void) |
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{ |
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int num; |
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for (num = 0; num < 32; num++) { |
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u32 header; |
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header = read_pci_config(0, num, 0, 0x00); |
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if (header != (PCI_VENDOR_ID_AMD | (0x1100<<16)) && |
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header != (PCI_VENDOR_ID_AMD | (0x1200<<16)) && |
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header != (PCI_VENDOR_ID_AMD | (0x1300<<16))) |
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continue; |
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header = read_pci_config(0, num, 1, 0x00); |
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if (header != (PCI_VENDOR_ID_AMD | (0x1101<<16)) && |
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header != (PCI_VENDOR_ID_AMD | (0x1201<<16)) && |
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header != (PCI_VENDOR_ID_AMD | (0x1301<<16))) |
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continue; |
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return num; |
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} |
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return -ENOENT; |
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} |
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int __init amd_numa_init(void) |
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{ |
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u64 start = PFN_PHYS(0); |
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u64 end = PFN_PHYS(max_pfn); |
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unsigned numnodes; |
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u64 prevbase; |
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int i, j, nb; |
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u32 nodeid, reg; |
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unsigned int bits, cores, apicid_base; |
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if (!early_pci_allowed()) |
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return -EINVAL; |
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nb = find_northbridge(); |
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if (nb < 0) |
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return nb; |
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pr_info("Scanning NUMA topology in Northbridge %d\n", nb); |
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reg = read_pci_config(0, nb, 0, 0x60); |
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numnodes = ((reg >> 4) & 0xF) + 1; |
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if (numnodes <= 1) |
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return -ENOENT; |
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pr_info("Number of physical nodes %d\n", numnodes); |
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prevbase = 0; |
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for (i = 0; i < 8; i++) { |
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u64 base, limit; |
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base = read_pci_config(0, nb, 1, 0x40 + i*8); |
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limit = read_pci_config(0, nb, 1, 0x44 + i*8); |
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nodeids[i] = nodeid = limit & 7; |
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if ((base & 3) == 0) { |
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if (i < numnodes) |
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pr_info("Skipping disabled node %d\n", i); |
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continue; |
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} |
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if (nodeid >= numnodes) { |
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pr_info("Ignoring excess node %d (%Lx:%Lx)\n", nodeid, |
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base, limit); |
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continue; |
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} |
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if (!limit) { |
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pr_info("Skipping node entry %d (base %Lx)\n", |
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i, base); |
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continue; |
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} |
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if ((base >> 8) & 3 || (limit >> 8) & 3) { |
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pr_err("Node %d using interleaving mode %Lx/%Lx\n", |
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nodeid, (base >> 8) & 3, (limit >> 8) & 3); |
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return -EINVAL; |
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} |
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if (node_isset(nodeid, numa_nodes_parsed)) { |
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pr_info("Node %d already present, skipping\n", |
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nodeid); |
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continue; |
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} |
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limit >>= 16; |
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limit++; |
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limit <<= 24; |
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if (limit > end) |
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limit = end; |
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if (limit <= base) |
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continue; |
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base >>= 16; |
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base <<= 24; |
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if (base < start) |
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base = start; |
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if (limit > end) |
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limit = end; |
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if (limit == base) { |
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pr_err("Empty node %d\n", nodeid); |
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continue; |
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} |
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if (limit < base) { |
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pr_err("Node %d bogus settings %Lx-%Lx.\n", |
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nodeid, base, limit); |
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continue; |
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} |
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/* Could sort here, but pun for now. Should not happen anyroads. */ |
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if (prevbase > base) { |
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pr_err("Node map not sorted %Lx,%Lx\n", |
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prevbase, base); |
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return -EINVAL; |
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} |
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pr_info("Node %d MemBase %016Lx Limit %016Lx\n", |
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nodeid, base, limit); |
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prevbase = base; |
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numa_add_memblk(nodeid, base, limit); |
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node_set(nodeid, numa_nodes_parsed); |
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} |
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if (!nodes_weight(numa_nodes_parsed)) |
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return -ENOENT; |
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/* |
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* We seem to have valid NUMA configuration. Map apicids to nodes |
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* using the coreid bits from early_identify_cpu. |
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*/ |
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bits = boot_cpu_data.x86_coreid_bits; |
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cores = 1 << bits; |
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apicid_base = 0; |
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/* |
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* get boot-time SMP configuration: |
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*/ |
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early_get_smp_config(); |
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if (boot_cpu_physical_apicid > 0) { |
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pr_info("BSP APIC ID: %02x\n", boot_cpu_physical_apicid); |
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apicid_base = boot_cpu_physical_apicid; |
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} |
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for_each_node_mask(i, numa_nodes_parsed) |
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for (j = apicid_base; j < cores + apicid_base; j++) |
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set_apicid_to_node((i << bits) + j, i); |
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return 0; |
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}
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