diff options
Diffstat (limited to 'drivers/acpi/numa/srat.c')
| -rw-r--r-- | drivers/acpi/numa/srat.c | 700 |
1 files changed, 700 insertions, 0 deletions
diff --git a/drivers/acpi/numa/srat.c b/drivers/acpi/numa/srat.c new file mode 100644 index 000000000000..aa87ee1583a4 --- /dev/null +++ b/drivers/acpi/numa/srat.c @@ -0,0 +1,700 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * acpi_numa.c - ACPI NUMA support + * + * Copyright (C) 2002 Takayoshi Kochi <t-kochi@bq.jp.nec.com> + */ + +#define pr_fmt(fmt) "ACPI: " fmt + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/types.h> +#include <linux/errno.h> +#include <linux/acpi.h> +#include <linux/memblock.h> +#include <linux/memory.h> +#include <linux/numa.h> +#include <linux/nodemask.h> +#include <linux/topology.h> +#include <linux/numa_memblks.h> +#include <linux/string_choices.h> + +static nodemask_t nodes_found_map = NODE_MASK_NONE; + +/* maps to convert between proximity domain and logical node ID */ +static int pxm_to_node_map[MAX_PXM_DOMAINS] + = { [0 ... MAX_PXM_DOMAINS - 1] = NUMA_NO_NODE }; +static int node_to_pxm_map[MAX_NUMNODES] + = { [0 ... MAX_NUMNODES - 1] = PXM_INVAL }; + +unsigned char acpi_srat_revision __initdata; +static int acpi_numa __initdata; + +static int last_real_pxm; + +void __init disable_srat(void) +{ + acpi_numa = -1; +} + +int pxm_to_node(int pxm) +{ + if (pxm < 0 || pxm >= MAX_PXM_DOMAINS || numa_off) + return NUMA_NO_NODE; + return pxm_to_node_map[pxm]; +} +EXPORT_SYMBOL(pxm_to_node); + +int node_to_pxm(int node) +{ + if (node < 0) + return PXM_INVAL; + return node_to_pxm_map[node]; +} +EXPORT_SYMBOL_GPL(node_to_pxm); + +static void __acpi_map_pxm_to_node(int pxm, int node) +{ + if (pxm_to_node_map[pxm] == NUMA_NO_NODE || node < pxm_to_node_map[pxm]) + pxm_to_node_map[pxm] = node; + if (node_to_pxm_map[node] == PXM_INVAL || pxm < node_to_pxm_map[node]) + node_to_pxm_map[node] = pxm; +} + +int acpi_map_pxm_to_node(int pxm) +{ + int node; + + if (pxm < 0 || pxm >= MAX_PXM_DOMAINS || numa_off) + return NUMA_NO_NODE; + + node = pxm_to_node_map[pxm]; + + if (node == NUMA_NO_NODE) { + node = first_unset_node(nodes_found_map); + if (node >= MAX_NUMNODES) + return NUMA_NO_NODE; + __acpi_map_pxm_to_node(pxm, node); + node_set(node, nodes_found_map); + } + + return node; +} +EXPORT_SYMBOL(acpi_map_pxm_to_node); + +#ifdef CONFIG_NUMA_EMU +/* + * Take max_nid - 1 fake-numa nodes into account in both + * pxm_to_node_map()/node_to_pxm_map[] tables. + */ +int __init fix_pxm_node_maps(int max_nid) +{ + static int pxm_to_node_map_copy[MAX_PXM_DOMAINS] __initdata + = { [0 ... MAX_PXM_DOMAINS - 1] = NUMA_NO_NODE }; + static int node_to_pxm_map_copy[MAX_NUMNODES] __initdata + = { [0 ... MAX_NUMNODES - 1] = PXM_INVAL }; + int i, j, index = -1, count = 0; + nodemask_t nodes_to_enable; + + if (numa_off) + return -1; + + /* no or incomplete node/PXM mapping set, nothing to do */ + if (srat_disabled()) + return 0; + + /* find fake nodes PXM mapping */ + for (i = 0; i < MAX_NUMNODES; i++) { + if (node_to_pxm_map[i] != PXM_INVAL) { + for (j = 0; j <= max_nid; j++) { + if ((emu_nid_to_phys[j] == i) && + WARN(node_to_pxm_map_copy[j] != PXM_INVAL, + "Node %d is already binded to PXM %d\n", + j, node_to_pxm_map_copy[j])) + return -1; + if (emu_nid_to_phys[j] == i) { + node_to_pxm_map_copy[j] = + node_to_pxm_map[i]; + if (j > index) + index = j; + count++; + } + } + } + } + if (index == -1) { + pr_debug("No node/PXM mapping has been set\n"); + /* nothing more to be done */ + return 0; + } + if (WARN(index != max_nid, "%d max nid when expected %d\n", + index, max_nid)) + return -1; + + nodes_clear(nodes_to_enable); + + /* map phys nodes not used for fake nodes */ + for (i = 0; i < MAX_NUMNODES; i++) { + if (node_to_pxm_map[i] != PXM_INVAL) { + for (j = 0; j <= max_nid; j++) + if (emu_nid_to_phys[j] == i) + break; + /* fake nodes PXM mapping has been done */ + if (j <= max_nid) + continue; + /* find first hole */ + for (j = 0; + j < MAX_NUMNODES && + node_to_pxm_map_copy[j] != PXM_INVAL; + j++) + ; + if (WARN(j == MAX_NUMNODES, + "Number of nodes exceeds MAX_NUMNODES\n")) + return -1; + node_to_pxm_map_copy[j] = node_to_pxm_map[i]; + node_set(j, nodes_to_enable); + count++; + } + } + + /* creating reverse mapping in pxm_to_node_map[] */ + for (i = 0; i < MAX_NUMNODES; i++) + if (node_to_pxm_map_copy[i] != PXM_INVAL && + pxm_to_node_map_copy[node_to_pxm_map_copy[i]] == NUMA_NO_NODE) + pxm_to_node_map_copy[node_to_pxm_map_copy[i]] = i; + + /* overwrite with new mapping */ + for (i = 0; i < MAX_NUMNODES; i++) { + node_to_pxm_map[i] = node_to_pxm_map_copy[i]; + pxm_to_node_map[i] = pxm_to_node_map_copy[i]; + } + + /* enable other nodes found in PXM for hotplug */ + nodes_or(numa_nodes_parsed, nodes_to_enable, numa_nodes_parsed); + + pr_debug("found %d total number of nodes\n", count); + return 0; +} +#endif + +static void __init +acpi_table_print_srat_entry(struct acpi_subtable_header *header) +{ + switch (header->type) { + case ACPI_SRAT_TYPE_CPU_AFFINITY: + { + struct acpi_srat_cpu_affinity *p = + (struct acpi_srat_cpu_affinity *)header; + pr_debug("SRAT Processor (id[0x%02x] eid[0x%02x]) in proximity domain %d %s\n", + p->apic_id, p->local_sapic_eid, + p->proximity_domain_lo, + str_enabled_disabled(p->flags & ACPI_SRAT_CPU_ENABLED)); + } + break; + + case ACPI_SRAT_TYPE_MEMORY_AFFINITY: + { + struct acpi_srat_mem_affinity *p = + (struct acpi_srat_mem_affinity *)header; + pr_debug("SRAT Memory (0x%llx length 0x%llx) in proximity domain %d %s%s%s\n", + (unsigned long long)p->base_address, + (unsigned long long)p->length, + p->proximity_domain, + str_enabled_disabled(p->flags & ACPI_SRAT_MEM_ENABLED), + (p->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE) ? + " hot-pluggable" : "", + (p->flags & ACPI_SRAT_MEM_NON_VOLATILE) ? + " non-volatile" : ""); + } + break; + + case ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY: + { + struct acpi_srat_x2apic_cpu_affinity *p = + (struct acpi_srat_x2apic_cpu_affinity *)header; + pr_debug("SRAT Processor (x2apicid[0x%08x]) in proximity domain %d %s\n", + p->apic_id, + p->proximity_domain, + str_enabled_disabled(p->flags & ACPI_SRAT_CPU_ENABLED)); + } + break; + + case ACPI_SRAT_TYPE_GICC_AFFINITY: + { + struct acpi_srat_gicc_affinity *p = + (struct acpi_srat_gicc_affinity *)header; + pr_debug("SRAT Processor (acpi id[0x%04x]) in proximity domain %d %s\n", + p->acpi_processor_uid, + p->proximity_domain, + str_enabled_disabled(p->flags & ACPI_SRAT_GICC_ENABLED)); + } + break; + + case ACPI_SRAT_TYPE_GENERIC_AFFINITY: + { + struct acpi_srat_generic_affinity *p = + (struct acpi_srat_generic_affinity *)header; + + if (p->device_handle_type == 1) { + /* + * For pci devices this may be the only place they + * are assigned a proximity domain + */ + pr_debug("SRAT Generic Initiator(Seg:%u BDF:%u) in proximity domain %d %s\n", + *(u16 *)(&p->device_handle[0]), + *(u16 *)(&p->device_handle[2]), + p->proximity_domain, + str_enabled_disabled(p->flags & ACPI_SRAT_GENERIC_AFFINITY_ENABLED)); + } else { + /* + * In this case we can rely on the device having a + * proximity domain reference + */ + pr_debug("SRAT Generic Initiator(HID=%.8s UID=%.4s) in proximity domain %d %s\n", + (char *)(&p->device_handle[0]), + (char *)(&p->device_handle[8]), + p->proximity_domain, + str_enabled_disabled(p->flags & ACPI_SRAT_GENERIC_AFFINITY_ENABLED)); + } + } + break; + + case ACPI_SRAT_TYPE_RINTC_AFFINITY: + { + struct acpi_srat_rintc_affinity *p = + (struct acpi_srat_rintc_affinity *)header; + pr_debug("SRAT Processor (acpi id[0x%04x]) in proximity domain %d %s\n", + p->acpi_processor_uid, + p->proximity_domain, + str_enabled_disabled(p->flags & ACPI_SRAT_RINTC_ENABLED)); + } + break; + + default: + pr_warn("Found unsupported SRAT entry (type = 0x%x)\n", + header->type); + break; + } +} + +/* + * A lot of BIOS fill in 10 (= no distance) everywhere. This messes + * up the NUMA heuristics which wants the local node to have a smaller + * distance than the others. + * Do some quick checks here and only use the SLIT if it passes. + */ +static int __init slit_valid(struct acpi_table_slit *slit) +{ + int i, j; + int d = slit->locality_count; + for (i = 0; i < d; i++) { + for (j = 0; j < d; j++) { + u8 val = slit->entry[d*i + j]; + if (i == j) { + if (val != LOCAL_DISTANCE) + return 0; + } else if (val <= LOCAL_DISTANCE) + return 0; + } + } + return 1; +} + +void __init bad_srat(void) +{ + pr_err("SRAT: SRAT not used.\n"); + disable_srat(); +} + +int __init srat_disabled(void) +{ + return acpi_numa < 0; +} + +__weak int __init numa_fill_memblks(u64 start, u64 end) +{ + return NUMA_NO_MEMBLK; +} + +/* + * Callback for SLIT parsing. pxm_to_node() returns NUMA_NO_NODE for + * I/O localities since SRAT does not list them. I/O localities are + * not supported at this point. + */ +static int __init acpi_parse_slit(struct acpi_table_header *table) +{ + struct acpi_table_slit *slit = (struct acpi_table_slit *)table; + int i, j; + + if (!slit_valid(slit)) { + pr_info("SLIT table looks invalid. Not used.\n"); + return -EINVAL; + } + + for (i = 0; i < slit->locality_count; i++) { + const int from_node = pxm_to_node(i); + + if (from_node == NUMA_NO_NODE) + continue; + + for (j = 0; j < slit->locality_count; j++) { + const int to_node = pxm_to_node(j); + + if (to_node == NUMA_NO_NODE) + continue; + + numa_set_distance(from_node, to_node, + slit->entry[slit->locality_count * i + j]); + } + } + + return 0; +} + +static int parsed_numa_memblks __initdata; + +static int __init +acpi_parse_memory_affinity(union acpi_subtable_headers *header, + const unsigned long table_end) +{ + struct acpi_srat_mem_affinity *ma; + u64 start, end; + u32 hotpluggable; + int node, pxm; + + ma = (struct acpi_srat_mem_affinity *)header; + + acpi_table_print_srat_entry(&header->common); + + if (srat_disabled()) + return 0; + if (ma->header.length < sizeof(struct acpi_srat_mem_affinity)) { + pr_err("SRAT: Unexpected header length: %d\n", + ma->header.length); + goto out_err_bad_srat; + } + if ((ma->flags & ACPI_SRAT_MEM_ENABLED) == 0) + return 0; + hotpluggable = IS_ENABLED(CONFIG_MEMORY_HOTPLUG) && + (ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE); + + start = ma->base_address; + end = start + ma->length; + pxm = ma->proximity_domain; + if (acpi_srat_revision <= 1) + pxm &= 0xff; + + node = acpi_map_pxm_to_node(pxm); + if (node == NUMA_NO_NODE) { + pr_err("SRAT: Too many proximity domains.\n"); + goto out_err_bad_srat; + } + + if (numa_add_memblk(node, start, end) < 0) { + pr_err("SRAT: Failed to add memblk to node %u [mem %#010Lx-%#010Lx]\n", + node, (unsigned long long) start, + (unsigned long long) end - 1); + goto out_err_bad_srat; + } + + node_set(node, numa_nodes_parsed); + + pr_info("SRAT: Node %u PXM %u [mem %#010Lx-%#010Lx]%s%s\n", + node, pxm, + (unsigned long long) start, (unsigned long long) end - 1, + hotpluggable ? " hotplug" : "", + ma->flags & ACPI_SRAT_MEM_NON_VOLATILE ? " non-volatile" : ""); + + /* Mark hotplug range in memblock. */ + if (hotpluggable && memblock_mark_hotplug(start, ma->length)) + pr_warn("SRAT: Failed to mark hotplug range [mem %#010Lx-%#010Lx] in memblock\n", + (unsigned long long)start, (unsigned long long)end - 1); + + max_possible_pfn = max(max_possible_pfn, PFN_UP(end - 1)); + + parsed_numa_memblks++; + + return 0; + +out_err_bad_srat: + /* Just disable SRAT, but do not fail and ignore errors. */ + bad_srat(); + + return 0; +} + +static int __init acpi_parse_cfmws(union acpi_subtable_headers *header, + void *arg, const unsigned long table_end) +{ + struct acpi_cedt_cfmws *cfmws; + int *fake_pxm = arg; + u64 start, end, align; + int node; + int err; + + cfmws = (struct acpi_cedt_cfmws *)header; + start = cfmws->base_hpa; + end = cfmws->base_hpa + cfmws->window_size; + + /* Align memblock size to CFMW regions if possible */ + align = 1UL << __ffs(start | end); + if (align >= SZ_256M) { + err = memory_block_advise_max_size(align); + if (err) + pr_warn("CFMWS: memblock size advise failed (%d)\n", err); + } else + pr_err("CFMWS: [BIOS BUG] base/size alignment violates spec\n"); + + /* + * The SRAT may have already described NUMA details for all, + * or a portion of, this CFMWS HPA range. Extend the memblks + * found for any portion of the window to cover the entire + * window. + */ + if (!numa_fill_memblks(start, end)) + return 0; + + /* No SRAT description. Create a new node. */ + node = acpi_map_pxm_to_node(*fake_pxm); + + if (node == NUMA_NO_NODE) { + pr_err("ACPI NUMA: Too many proximity domains while processing CFMWS.\n"); + return -EINVAL; + } + + if (numa_add_reserved_memblk(node, start, end) < 0) { + /* CXL driver must handle the NUMA_NO_NODE case */ + pr_warn("ACPI NUMA: Failed to add memblk for CFMWS node %d [mem %#llx-%#llx]\n", + node, start, end); + } + node_set(node, numa_nodes_parsed); + + /* Set the next available fake_pxm value */ + (*fake_pxm)++; + return 0; +} + +void __init __weak +acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa) +{ + pr_warn("Found unsupported x2apic [0x%08x] SRAT entry\n", pa->apic_id); +} + +static int __init +acpi_parse_x2apic_affinity(union acpi_subtable_headers *header, + const unsigned long end) +{ + struct acpi_srat_x2apic_cpu_affinity *processor_affinity; + + processor_affinity = (struct acpi_srat_x2apic_cpu_affinity *)header; + + acpi_table_print_srat_entry(&header->common); + + /* let architecture-dependent part to do it */ + acpi_numa_x2apic_affinity_init(processor_affinity); + + return 0; +} + +static int __init +acpi_parse_processor_affinity(union acpi_subtable_headers *header, + const unsigned long end) +{ + struct acpi_srat_cpu_affinity *processor_affinity; + + processor_affinity = (struct acpi_srat_cpu_affinity *)header; + + acpi_table_print_srat_entry(&header->common); + + /* let architecture-dependent part to do it */ + acpi_numa_processor_affinity_init(processor_affinity); + + return 0; +} + +static int __init +acpi_parse_gicc_affinity(union acpi_subtable_headers *header, + const unsigned long end) +{ + struct acpi_srat_gicc_affinity *processor_affinity; + + processor_affinity = (struct acpi_srat_gicc_affinity *)header; + + acpi_table_print_srat_entry(&header->common); + + /* let architecture-dependent part to do it */ + acpi_numa_gicc_affinity_init(processor_affinity); + + return 0; +} + +#if defined(CONFIG_X86) || defined(CONFIG_ARM64) +static int __init +acpi_parse_gi_affinity(union acpi_subtable_headers *header, + const unsigned long end) +{ + struct acpi_srat_generic_affinity *gi_affinity; + int node; + + gi_affinity = (struct acpi_srat_generic_affinity *)header; + if (!gi_affinity) + return -EINVAL; + acpi_table_print_srat_entry(&header->common); + + if (!(gi_affinity->flags & ACPI_SRAT_GENERIC_AFFINITY_ENABLED)) + return -EINVAL; + + node = acpi_map_pxm_to_node(gi_affinity->proximity_domain); + if (node == NUMA_NO_NODE) { + pr_err("SRAT: Too many proximity domains.\n"); + return -EINVAL; + } + node_set(node, numa_nodes_parsed); + node_set_state(node, N_GENERIC_INITIATOR); + + return 0; +} +#else +static int __init +acpi_parse_gi_affinity(union acpi_subtable_headers *header, + const unsigned long end) +{ + return 0; +} +#endif /* defined(CONFIG_X86) || defined (CONFIG_ARM64) */ + +static int __init +acpi_parse_rintc_affinity(union acpi_subtable_headers *header, + const unsigned long end) +{ + struct acpi_srat_rintc_affinity *rintc_affinity; + + rintc_affinity = (struct acpi_srat_rintc_affinity *)header; + acpi_table_print_srat_entry(&header->common); + + /* let architecture-dependent part to do it */ + acpi_numa_rintc_affinity_init(rintc_affinity); + + return 0; +} + +static int __init acpi_parse_srat(struct acpi_table_header *table) +{ + struct acpi_table_srat *srat = (struct acpi_table_srat *)table; + + acpi_srat_revision = srat->header.revision; + + /* Real work done in acpi_table_parse_srat below. */ + + return 0; +} + +static int __init +acpi_table_parse_srat(enum acpi_srat_type id, + acpi_tbl_entry_handler handler, unsigned int max_entries) +{ + return acpi_table_parse_entries(ACPI_SIG_SRAT, + sizeof(struct acpi_table_srat), id, + handler, max_entries); +} + +int __init acpi_numa_init(void) +{ + int i, fake_pxm, cnt = 0; + + if (acpi_disabled) + return -EINVAL; + + /* + * Should not limit number with cpu num that is from NR_CPUS or nr_cpus= + * SRAT cpu entries could have different order with that in MADT. + * So go over all cpu entries in SRAT to get apicid to node mapping. + */ + + /* SRAT: System Resource Affinity Table */ + if (!acpi_table_parse(ACPI_SIG_SRAT, acpi_parse_srat)) { + struct acpi_subtable_proc srat_proc[5]; + + memset(srat_proc, 0, sizeof(srat_proc)); + srat_proc[0].id = ACPI_SRAT_TYPE_CPU_AFFINITY; + srat_proc[0].handler = acpi_parse_processor_affinity; + srat_proc[1].id = ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY; + srat_proc[1].handler = acpi_parse_x2apic_affinity; + srat_proc[2].id = ACPI_SRAT_TYPE_GICC_AFFINITY; + srat_proc[2].handler = acpi_parse_gicc_affinity; + srat_proc[3].id = ACPI_SRAT_TYPE_GENERIC_AFFINITY; + srat_proc[3].handler = acpi_parse_gi_affinity; + srat_proc[4].id = ACPI_SRAT_TYPE_RINTC_AFFINITY; + srat_proc[4].handler = acpi_parse_rintc_affinity; + + acpi_table_parse_entries_array(ACPI_SIG_SRAT, + sizeof(struct acpi_table_srat), + srat_proc, ARRAY_SIZE(srat_proc), 0); + + cnt = acpi_table_parse_srat(ACPI_SRAT_TYPE_MEMORY_AFFINITY, + acpi_parse_memory_affinity, 0); + } + + /* SLIT: System Locality Information Table */ + acpi_table_parse(ACPI_SIG_SLIT, acpi_parse_slit); + + /* + * CXL Fixed Memory Window Structures (CFMWS) must be parsed + * after the SRAT. Create NUMA Nodes for CXL memory ranges that + * are defined in the CFMWS and not already defined in the SRAT. + * Initialize a fake_pxm as the first available PXM to emulate. + */ + + /* fake_pxm is the next unused PXM value after SRAT parsing */ + for (i = 0, fake_pxm = -1; i < MAX_NUMNODES; i++) { + if (node_to_pxm_map[i] > fake_pxm) + fake_pxm = node_to_pxm_map[i]; + } + last_real_pxm = fake_pxm; + fake_pxm++; + acpi_table_parse_cedt(ACPI_CEDT_TYPE_CFMWS, acpi_parse_cfmws, + &fake_pxm); + + if (cnt < 0) + return cnt; + else if (!parsed_numa_memblks) + return -ENOENT; + return 0; +} + +bool acpi_node_backed_by_real_pxm(int nid) +{ + int pxm = node_to_pxm(nid); + + return pxm <= last_real_pxm; +} +EXPORT_SYMBOL_GPL(acpi_node_backed_by_real_pxm); + +static int acpi_get_pxm(acpi_handle h) +{ + unsigned long long pxm; + acpi_status status; + acpi_handle handle; + acpi_handle phandle = h; + + do { + handle = phandle; + status = acpi_evaluate_integer(handle, "_PXM", NULL, &pxm); + if (ACPI_SUCCESS(status)) + return pxm; + status = acpi_get_parent(handle, &phandle); + } while (ACPI_SUCCESS(status)); + return -1; +} + +int acpi_get_node(acpi_handle handle) +{ + int pxm; + + pxm = acpi_get_pxm(handle); + + return pxm_to_node(pxm); +} +EXPORT_SYMBOL(acpi_get_node); |