diff options
Diffstat (limited to 'arch/powerpc/mm/numa.c')
| -rw-r--r-- | arch/powerpc/mm/numa.c | 41 |
1 files changed, 24 insertions, 17 deletions
diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c index f976676004ad..917904d2fe97 100644 --- a/arch/powerpc/mm/numa.c +++ b/arch/powerpc/mm/numa.c @@ -1,12 +1,8 @@ +// SPDX-License-Identifier: GPL-2.0-or-later /* * pSeries NUMA support * * Copyright (C) 2002 Anton Blanchard <anton@au.ibm.com>, IBM - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version - * 2 of the License, or (at your option) any later version. */ #define pr_fmt(fmt) "numa: " fmt @@ -32,7 +28,6 @@ #include <asm/sparsemem.h> #include <asm/prom.h> #include <asm/smp.h> -#include <asm/cputhreads.h> #include <asm/topology.h> #include <asm/firmware.h> #include <asm/paca.h> @@ -908,16 +903,22 @@ static int __init early_numa(char *p) } early_param("numa", early_numa); -static bool topology_updates_enabled = true; +/* + * The platform can inform us through one of several mechanisms + * (post-migration device tree updates, PRRN or VPHN) that the NUMA + * assignment of a resource has changed. This controls whether we act + * on that. Disabled by default. + */ +static bool topology_updates_enabled; static int __init early_topology_updates(char *p) { if (!p) return 0; - if (!strcmp(p, "off")) { - pr_info("Disabling topology updates\n"); - topology_updates_enabled = false; + if (!strcmp(p, "on")) { + pr_warn("Caution: enabling topology updates\n"); + topology_updates_enabled = true; } return 0; @@ -1063,7 +1064,7 @@ u64 memory_hotplug_max(void) /* Virtual Processor Home Node (VPHN) support */ #ifdef CONFIG_PPC_SPLPAR -#include "vphn.h" +#include "book3s64/vphn.h" struct topology_update_data { struct topology_update_data *next; @@ -1498,6 +1499,9 @@ int start_topology_update(void) { int rc = 0; + if (!topology_updates_enabled) + return 0; + if (firmware_has_feature(FW_FEATURE_PRRN)) { if (!prrn_enabled) { prrn_enabled = 1; @@ -1531,6 +1535,9 @@ int stop_topology_update(void) { int rc = 0; + if (!topology_updates_enabled) + return 0; + if (prrn_enabled) { prrn_enabled = 0; #ifdef CONFIG_SMP @@ -1588,11 +1595,13 @@ static ssize_t topology_write(struct file *file, const char __user *buf, kbuf[read_len] = '\0'; - if (!strncmp(kbuf, "on", 2)) + if (!strncmp(kbuf, "on", 2)) { + topology_updates_enabled = true; start_topology_update(); - else if (!strncmp(kbuf, "off", 3)) + } else if (!strncmp(kbuf, "off", 3)) { stop_topology_update(); - else + topology_updates_enabled = false; + } else return -EINVAL; return count; @@ -1607,9 +1616,7 @@ static const struct file_operations topology_ops = { static int topology_update_init(void) { - /* Do not poll for changes if disabled at boot */ - if (topology_updates_enabled) - start_topology_update(); + start_topology_update(); if (vphn_enabled) topology_schedule_update(); |