![Thomas Gleixner](/assets/img/avatar_default.png)
The CPU hotplug callback fiddles with the cpus_allowed pointer to pin the calling thread on the plugged CPU. That's already guaranteed by the hotplug core code. Remove it. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: Tony Luck <tony.luck@intel.com> Cc: linux-ia64@vger.kernel.org Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Sebastian Siewior <bigeasy@linutronix.de> Cc: Lai Jiangshan <jiangshanlai@gmail.com> Cc: Viresh Kumar <viresh.kumar@linaro.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Tejun Heo <tj@kernel.org> Cc: "David S. Miller" <davem@davemloft.net> Cc: Len Brown <lenb@kernel.org> Link: http://lkml.kernel.org/r/20170412201042.174518069@linutronix.de Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
425 lines
10 KiB
C
425 lines
10 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* This file contains NUMA specific variables and functions which can
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* be split away from DISCONTIGMEM and are used on NUMA machines with
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* contiguous memory.
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* 2002/08/07 Erich Focht <efocht@ess.nec.de>
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* Populate cpu entries in sysfs for non-numa systems as well
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* Intel Corporation - Ashok Raj
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* 02/27/2006 Zhang, Yanmin
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* Populate cpu cache entries in sysfs for cpu cache info
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*/
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#include <linux/cpu.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/node.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/bootmem.h>
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#include <linux/nodemask.h>
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#include <linux/notifier.h>
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#include <linux/export.h>
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#include <asm/mmzone.h>
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#include <asm/numa.h>
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#include <asm/cpu.h>
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static struct ia64_cpu *sysfs_cpus;
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void arch_fix_phys_package_id(int num, u32 slot)
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{
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#ifdef CONFIG_SMP
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if (cpu_data(num)->socket_id == -1)
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cpu_data(num)->socket_id = slot;
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#endif
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}
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EXPORT_SYMBOL_GPL(arch_fix_phys_package_id);
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#ifdef CONFIG_HOTPLUG_CPU
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int __ref arch_register_cpu(int num)
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{
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#ifdef CONFIG_ACPI
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/*
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* If CPEI can be re-targeted or if this is not
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* CPEI target, then it is hotpluggable
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*/
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if (can_cpei_retarget() || !is_cpu_cpei_target(num))
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sysfs_cpus[num].cpu.hotpluggable = 1;
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map_cpu_to_node(num, node_cpuid[num].nid);
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#endif
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return register_cpu(&sysfs_cpus[num].cpu, num);
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}
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EXPORT_SYMBOL(arch_register_cpu);
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void __ref arch_unregister_cpu(int num)
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{
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unregister_cpu(&sysfs_cpus[num].cpu);
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#ifdef CONFIG_ACPI
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unmap_cpu_from_node(num, cpu_to_node(num));
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#endif
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}
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EXPORT_SYMBOL(arch_unregister_cpu);
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#else
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static int __init arch_register_cpu(int num)
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{
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return register_cpu(&sysfs_cpus[num].cpu, num);
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}
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#endif /*CONFIG_HOTPLUG_CPU*/
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static int __init topology_init(void)
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{
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int i, err = 0;
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#ifdef CONFIG_NUMA
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/*
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* MCD - Do we want to register all ONLINE nodes, or all POSSIBLE nodes?
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*/
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for_each_online_node(i) {
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if ((err = register_one_node(i)))
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goto out;
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}
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#endif
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sysfs_cpus = kzalloc(sizeof(struct ia64_cpu) * NR_CPUS, GFP_KERNEL);
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if (!sysfs_cpus)
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panic("kzalloc in topology_init failed - NR_CPUS too big?");
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for_each_present_cpu(i) {
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if((err = arch_register_cpu(i)))
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goto out;
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}
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out:
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return err;
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}
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subsys_initcall(topology_init);
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/*
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* Export cpu cache information through sysfs
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*/
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/*
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* A bunch of string array to get pretty printing
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*/
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static const char *cache_types[] = {
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"", /* not used */
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"Instruction",
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"Data",
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"Unified" /* unified */
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};
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static const char *cache_mattrib[]={
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"WriteThrough",
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"WriteBack",
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"", /* reserved */
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"" /* reserved */
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};
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struct cache_info {
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pal_cache_config_info_t cci;
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cpumask_t shared_cpu_map;
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int level;
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int type;
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struct kobject kobj;
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};
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struct cpu_cache_info {
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struct cache_info *cache_leaves;
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int num_cache_leaves;
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struct kobject kobj;
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};
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static struct cpu_cache_info all_cpu_cache_info[NR_CPUS];
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#define LEAF_KOBJECT_PTR(x,y) (&all_cpu_cache_info[x].cache_leaves[y])
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#ifdef CONFIG_SMP
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static void cache_shared_cpu_map_setup(unsigned int cpu,
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struct cache_info * this_leaf)
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{
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pal_cache_shared_info_t csi;
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int num_shared, i = 0;
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unsigned int j;
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if (cpu_data(cpu)->threads_per_core <= 1 &&
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cpu_data(cpu)->cores_per_socket <= 1) {
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cpumask_set_cpu(cpu, &this_leaf->shared_cpu_map);
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return;
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}
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if (ia64_pal_cache_shared_info(this_leaf->level,
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this_leaf->type,
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0,
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&csi) != PAL_STATUS_SUCCESS)
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return;
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num_shared = (int) csi.num_shared;
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do {
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for_each_possible_cpu(j)
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if (cpu_data(cpu)->socket_id == cpu_data(j)->socket_id
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&& cpu_data(j)->core_id == csi.log1_cid
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&& cpu_data(j)->thread_id == csi.log1_tid)
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cpumask_set_cpu(j, &this_leaf->shared_cpu_map);
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i++;
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} while (i < num_shared &&
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ia64_pal_cache_shared_info(this_leaf->level,
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this_leaf->type,
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i,
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&csi) == PAL_STATUS_SUCCESS);
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}
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#else
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static void cache_shared_cpu_map_setup(unsigned int cpu,
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struct cache_info * this_leaf)
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{
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cpumask_set_cpu(cpu, &this_leaf->shared_cpu_map);
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return;
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}
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#endif
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static ssize_t show_coherency_line_size(struct cache_info *this_leaf,
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char *buf)
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{
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return sprintf(buf, "%u\n", 1 << this_leaf->cci.pcci_line_size);
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}
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static ssize_t show_ways_of_associativity(struct cache_info *this_leaf,
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char *buf)
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{
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return sprintf(buf, "%u\n", this_leaf->cci.pcci_assoc);
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}
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static ssize_t show_attributes(struct cache_info *this_leaf, char *buf)
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{
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return sprintf(buf,
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"%s\n",
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cache_mattrib[this_leaf->cci.pcci_cache_attr]);
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}
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static ssize_t show_size(struct cache_info *this_leaf, char *buf)
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{
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return sprintf(buf, "%uK\n", this_leaf->cci.pcci_cache_size / 1024);
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}
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static ssize_t show_number_of_sets(struct cache_info *this_leaf, char *buf)
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{
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unsigned number_of_sets = this_leaf->cci.pcci_cache_size;
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number_of_sets /= this_leaf->cci.pcci_assoc;
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number_of_sets /= 1 << this_leaf->cci.pcci_line_size;
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return sprintf(buf, "%u\n", number_of_sets);
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}
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static ssize_t show_shared_cpu_map(struct cache_info *this_leaf, char *buf)
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{
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cpumask_t shared_cpu_map;
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cpumask_and(&shared_cpu_map,
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&this_leaf->shared_cpu_map, cpu_online_mask);
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return scnprintf(buf, PAGE_SIZE, "%*pb\n",
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cpumask_pr_args(&shared_cpu_map));
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}
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static ssize_t show_type(struct cache_info *this_leaf, char *buf)
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{
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int type = this_leaf->type + this_leaf->cci.pcci_unified;
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return sprintf(buf, "%s\n", cache_types[type]);
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}
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static ssize_t show_level(struct cache_info *this_leaf, char *buf)
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{
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return sprintf(buf, "%u\n", this_leaf->level);
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}
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struct cache_attr {
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struct attribute attr;
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ssize_t (*show)(struct cache_info *, char *);
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ssize_t (*store)(struct cache_info *, const char *, size_t count);
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};
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#ifdef define_one_ro
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#undef define_one_ro
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#endif
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#define define_one_ro(_name) \
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static struct cache_attr _name = \
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__ATTR(_name, 0444, show_##_name, NULL)
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define_one_ro(level);
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define_one_ro(type);
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define_one_ro(coherency_line_size);
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define_one_ro(ways_of_associativity);
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define_one_ro(size);
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define_one_ro(number_of_sets);
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define_one_ro(shared_cpu_map);
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define_one_ro(attributes);
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static struct attribute * cache_default_attrs[] = {
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&type.attr,
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&level.attr,
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&coherency_line_size.attr,
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&ways_of_associativity.attr,
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&attributes.attr,
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&size.attr,
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&number_of_sets.attr,
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&shared_cpu_map.attr,
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NULL
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};
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#define to_object(k) container_of(k, struct cache_info, kobj)
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#define to_attr(a) container_of(a, struct cache_attr, attr)
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static ssize_t ia64_cache_show(struct kobject * kobj, struct attribute * attr, char * buf)
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{
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struct cache_attr *fattr = to_attr(attr);
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struct cache_info *this_leaf = to_object(kobj);
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ssize_t ret;
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ret = fattr->show ? fattr->show(this_leaf, buf) : 0;
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return ret;
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}
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static const struct sysfs_ops cache_sysfs_ops = {
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.show = ia64_cache_show
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};
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static struct kobj_type cache_ktype = {
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.sysfs_ops = &cache_sysfs_ops,
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.default_attrs = cache_default_attrs,
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};
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static struct kobj_type cache_ktype_percpu_entry = {
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.sysfs_ops = &cache_sysfs_ops,
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};
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static void cpu_cache_sysfs_exit(unsigned int cpu)
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{
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kfree(all_cpu_cache_info[cpu].cache_leaves);
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all_cpu_cache_info[cpu].cache_leaves = NULL;
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all_cpu_cache_info[cpu].num_cache_leaves = 0;
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memset(&all_cpu_cache_info[cpu].kobj, 0, sizeof(struct kobject));
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return;
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}
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static int cpu_cache_sysfs_init(unsigned int cpu)
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{
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unsigned long i, levels, unique_caches;
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pal_cache_config_info_t cci;
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int j;
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long status;
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struct cache_info *this_cache;
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int num_cache_leaves = 0;
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if ((status = ia64_pal_cache_summary(&levels, &unique_caches)) != 0) {
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printk(KERN_ERR "ia64_pal_cache_summary=%ld\n", status);
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return -1;
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}
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this_cache=kzalloc(sizeof(struct cache_info)*unique_caches,
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GFP_KERNEL);
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if (this_cache == NULL)
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return -ENOMEM;
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for (i=0; i < levels; i++) {
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for (j=2; j >0 ; j--) {
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if ((status=ia64_pal_cache_config_info(i,j, &cci)) !=
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PAL_STATUS_SUCCESS)
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continue;
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this_cache[num_cache_leaves].cci = cci;
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this_cache[num_cache_leaves].level = i + 1;
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this_cache[num_cache_leaves].type = j;
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cache_shared_cpu_map_setup(cpu,
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&this_cache[num_cache_leaves]);
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num_cache_leaves ++;
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}
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}
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all_cpu_cache_info[cpu].cache_leaves = this_cache;
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all_cpu_cache_info[cpu].num_cache_leaves = num_cache_leaves;
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memset(&all_cpu_cache_info[cpu].kobj, 0, sizeof(struct kobject));
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return 0;
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}
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/* Add cache interface for CPU device */
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static int cache_add_dev(unsigned int cpu)
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{
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struct device *sys_dev = get_cpu_device(cpu);
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unsigned long i, j;
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struct cache_info *this_object;
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int retval = 0;
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if (all_cpu_cache_info[cpu].kobj.parent)
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return 0;
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retval = cpu_cache_sysfs_init(cpu);
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if (unlikely(retval < 0))
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return retval;
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retval = kobject_init_and_add(&all_cpu_cache_info[cpu].kobj,
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&cache_ktype_percpu_entry, &sys_dev->kobj,
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"%s", "cache");
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if (unlikely(retval < 0)) {
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cpu_cache_sysfs_exit(cpu);
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return retval;
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}
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for (i = 0; i < all_cpu_cache_info[cpu].num_cache_leaves; i++) {
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this_object = LEAF_KOBJECT_PTR(cpu,i);
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retval = kobject_init_and_add(&(this_object->kobj),
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&cache_ktype,
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&all_cpu_cache_info[cpu].kobj,
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"index%1lu", i);
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if (unlikely(retval)) {
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for (j = 0; j < i; j++) {
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kobject_put(&(LEAF_KOBJECT_PTR(cpu,j)->kobj));
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}
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kobject_put(&all_cpu_cache_info[cpu].kobj);
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cpu_cache_sysfs_exit(cpu);
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return retval;
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}
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kobject_uevent(&(this_object->kobj), KOBJ_ADD);
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}
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kobject_uevent(&all_cpu_cache_info[cpu].kobj, KOBJ_ADD);
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return retval;
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}
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/* Remove cache interface for CPU device */
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static int cache_remove_dev(unsigned int cpu)
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{
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unsigned long i;
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for (i = 0; i < all_cpu_cache_info[cpu].num_cache_leaves; i++)
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kobject_put(&(LEAF_KOBJECT_PTR(cpu,i)->kobj));
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if (all_cpu_cache_info[cpu].kobj.parent) {
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kobject_put(&all_cpu_cache_info[cpu].kobj);
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memset(&all_cpu_cache_info[cpu].kobj,
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0,
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sizeof(struct kobject));
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}
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cpu_cache_sysfs_exit(cpu);
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return 0;
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}
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static int __init cache_sysfs_init(void)
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{
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int ret;
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ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "ia64/topology:online",
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cache_add_dev, cache_remove_dev);
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WARN_ON(ret < 0);
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return 0;
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}
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device_initcall(cache_sysfs_init);
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