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![Ingo Molnar](/assets/img/avatar_default.png)
Move the following task->mm helper APIs into a new header file, <linux/sched/mm.h>, to further reduce the size and complexity of <linux/sched.h>. Here are how the APIs are used in various kernel files: # mm_alloc(): arch/arm/mach-rpc/ecard.c fs/exec.c include/linux/sched/mm.h kernel/fork.c # __mmdrop(): arch/arc/include/asm/mmu_context.h include/linux/sched/mm.h kernel/fork.c # mmdrop(): arch/arm/mach-rpc/ecard.c arch/m68k/sun3/mmu_emu.c arch/x86/mm/tlb.c drivers/gpu/drm/amd/amdkfd/kfd_process.c drivers/gpu/drm/i915/i915_gem_userptr.c drivers/infiniband/hw/hfi1/file_ops.c drivers/vfio/vfio_iommu_spapr_tce.c fs/exec.c fs/proc/base.c fs/proc/task_mmu.c fs/proc/task_nommu.c fs/userfaultfd.c include/linux/mmu_notifier.h include/linux/sched/mm.h kernel/fork.c kernel/futex.c kernel/sched/core.c mm/khugepaged.c mm/ksm.c mm/mmu_context.c mm/mmu_notifier.c mm/oom_kill.c virt/kvm/kvm_main.c # mmdrop_async_fn(): include/linux/sched/mm.h # mmdrop_async(): include/linux/sched/mm.h kernel/fork.c # mmget_not_zero(): fs/userfaultfd.c include/linux/sched/mm.h mm/oom_kill.c # mmput(): arch/arc/include/asm/mmu_context.h arch/arc/kernel/troubleshoot.c arch/frv/mm/mmu-context.c arch/powerpc/platforms/cell/spufs/context.c arch/sparc/include/asm/mmu_context_32.h drivers/android/binder.c drivers/gpu/drm/etnaviv/etnaviv_gem.c drivers/gpu/drm/i915/i915_gem_userptr.c drivers/infiniband/core/umem.c drivers/infiniband/core/umem_odp.c drivers/infiniband/core/uverbs_main.c drivers/infiniband/hw/mlx4/main.c drivers/infiniband/hw/mlx5/main.c drivers/infiniband/hw/usnic/usnic_uiom.c drivers/iommu/amd_iommu_v2.c drivers/iommu/intel-svm.c drivers/lguest/lguest_user.c drivers/misc/cxl/fault.c drivers/misc/mic/scif/scif_rma.c drivers/oprofile/buffer_sync.c drivers/vfio/vfio_iommu_type1.c drivers/vhost/vhost.c drivers/xen/gntdev.c fs/exec.c fs/proc/array.c fs/proc/base.c fs/proc/task_mmu.c fs/proc/task_nommu.c fs/userfaultfd.c include/linux/sched/mm.h kernel/cpuset.c kernel/events/core.c kernel/events/uprobes.c kernel/exit.c kernel/fork.c kernel/ptrace.c kernel/sys.c kernel/trace/trace_output.c kernel/tsacct.c mm/memcontrol.c mm/memory.c mm/mempolicy.c mm/migrate.c mm/mmu_notifier.c mm/nommu.c mm/oom_kill.c mm/process_vm_access.c mm/rmap.c mm/swapfile.c mm/util.c virt/kvm/async_pf.c # mmput_async(): include/linux/sched/mm.h kernel/fork.c mm/oom_kill.c # get_task_mm(): arch/arc/kernel/troubleshoot.c arch/powerpc/platforms/cell/spufs/context.c drivers/android/binder.c drivers/gpu/drm/etnaviv/etnaviv_gem.c drivers/infiniband/core/umem.c drivers/infiniband/core/umem_odp.c drivers/infiniband/hw/mlx4/main.c drivers/infiniband/hw/mlx5/main.c drivers/infiniband/hw/usnic/usnic_uiom.c drivers/iommu/amd_iommu_v2.c drivers/iommu/intel-svm.c drivers/lguest/lguest_user.c drivers/misc/cxl/fault.c drivers/misc/mic/scif/scif_rma.c drivers/oprofile/buffer_sync.c drivers/vfio/vfio_iommu_type1.c drivers/vhost/vhost.c drivers/xen/gntdev.c fs/proc/array.c fs/proc/base.c fs/proc/task_mmu.c include/linux/sched/mm.h kernel/cpuset.c kernel/events/core.c kernel/exit.c kernel/fork.c kernel/ptrace.c kernel/sys.c kernel/trace/trace_output.c kernel/tsacct.c mm/memcontrol.c mm/memory.c mm/mempolicy.c mm/migrate.c mm/mmu_notifier.c mm/nommu.c mm/util.c # mm_access(): fs/proc/base.c include/linux/sched/mm.h kernel/fork.c mm/process_vm_access.c # mm_release(): arch/arc/include/asm/mmu_context.h fs/exec.c include/linux/sched/mm.h include/uapi/linux/sched.h kernel/exit.c kernel/fork.c Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
476 lines
9.6 KiB
C
476 lines
9.6 KiB
C
/*
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* arch/sh/kernel/smp.c
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*
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* SMP support for the SuperH processors.
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*
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* Copyright (C) 2002 - 2010 Paul Mundt
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* Copyright (C) 2006 - 2007 Akio Idehara
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*
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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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#include <linux/err.h>
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#include <linux/cache.h>
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#include <linux/cpumask.h>
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/spinlock.h>
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#include <linux/mm.h>
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#include <linux/module.h>
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#include <linux/cpu.h>
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#include <linux/interrupt.h>
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#include <linux/sched/mm.h>
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#include <linux/sched/hotplug.h>
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#include <linux/atomic.h>
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#include <linux/clockchips.h>
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#include <asm/processor.h>
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#include <asm/mmu_context.h>
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#include <asm/smp.h>
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#include <asm/cacheflush.h>
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#include <asm/sections.h>
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#include <asm/setup.h>
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int __cpu_number_map[NR_CPUS]; /* Map physical to logical */
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int __cpu_logical_map[NR_CPUS]; /* Map logical to physical */
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struct plat_smp_ops *mp_ops = NULL;
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/* State of each CPU */
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DEFINE_PER_CPU(int, cpu_state) = { 0 };
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void register_smp_ops(struct plat_smp_ops *ops)
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{
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if (mp_ops)
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printk(KERN_WARNING "Overriding previously set SMP ops\n");
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mp_ops = ops;
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}
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static inline void smp_store_cpu_info(unsigned int cpu)
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{
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struct sh_cpuinfo *c = cpu_data + cpu;
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memcpy(c, &boot_cpu_data, sizeof(struct sh_cpuinfo));
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c->loops_per_jiffy = loops_per_jiffy;
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}
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void __init smp_prepare_cpus(unsigned int max_cpus)
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{
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unsigned int cpu = smp_processor_id();
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init_new_context(current, &init_mm);
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current_thread_info()->cpu = cpu;
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mp_ops->prepare_cpus(max_cpus);
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#ifndef CONFIG_HOTPLUG_CPU
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init_cpu_present(cpu_possible_mask);
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#endif
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}
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void __init smp_prepare_boot_cpu(void)
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{
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unsigned int cpu = smp_processor_id();
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__cpu_number_map[0] = cpu;
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__cpu_logical_map[0] = cpu;
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set_cpu_online(cpu, true);
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set_cpu_possible(cpu, true);
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per_cpu(cpu_state, cpu) = CPU_ONLINE;
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}
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#ifdef CONFIG_HOTPLUG_CPU
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void native_cpu_die(unsigned int cpu)
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{
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unsigned int i;
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for (i = 0; i < 10; i++) {
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smp_rmb();
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if (per_cpu(cpu_state, cpu) == CPU_DEAD) {
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if (system_state == SYSTEM_RUNNING)
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pr_info("CPU %u is now offline\n", cpu);
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return;
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}
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msleep(100);
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}
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pr_err("CPU %u didn't die...\n", cpu);
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}
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int native_cpu_disable(unsigned int cpu)
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{
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return cpu == 0 ? -EPERM : 0;
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}
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void play_dead_common(void)
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{
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idle_task_exit();
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irq_ctx_exit(raw_smp_processor_id());
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mb();
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__this_cpu_write(cpu_state, CPU_DEAD);
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local_irq_disable();
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}
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void native_play_dead(void)
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{
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play_dead_common();
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}
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int __cpu_disable(void)
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{
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unsigned int cpu = smp_processor_id();
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int ret;
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ret = mp_ops->cpu_disable(cpu);
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if (ret)
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return ret;
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/*
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* Take this CPU offline. Once we clear this, we can't return,
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* and we must not schedule until we're ready to give up the cpu.
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*/
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set_cpu_online(cpu, false);
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/*
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* OK - migrate IRQs away from this CPU
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*/
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migrate_irqs();
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/*
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* Flush user cache and TLB mappings, and then remove this CPU
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* from the vm mask set of all processes.
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*/
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flush_cache_all();
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#ifdef CONFIG_MMU
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local_flush_tlb_all();
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#endif
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clear_tasks_mm_cpumask(cpu);
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return 0;
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}
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#else /* ... !CONFIG_HOTPLUG_CPU */
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int native_cpu_disable(unsigned int cpu)
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{
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return -ENOSYS;
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}
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void native_cpu_die(unsigned int cpu)
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{
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/* We said "no" in __cpu_disable */
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BUG();
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}
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void native_play_dead(void)
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{
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BUG();
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}
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#endif
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asmlinkage void start_secondary(void)
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{
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unsigned int cpu = smp_processor_id();
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struct mm_struct *mm = &init_mm;
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enable_mmu();
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mmgrab(mm);
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mmget(mm);
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current->active_mm = mm;
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#ifdef CONFIG_MMU
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enter_lazy_tlb(mm, current);
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local_flush_tlb_all();
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#endif
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per_cpu_trap_init();
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preempt_disable();
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notify_cpu_starting(cpu);
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local_irq_enable();
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calibrate_delay();
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smp_store_cpu_info(cpu);
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set_cpu_online(cpu, true);
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per_cpu(cpu_state, cpu) = CPU_ONLINE;
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cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
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}
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extern struct {
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unsigned long sp;
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unsigned long bss_start;
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unsigned long bss_end;
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void *start_kernel_fn;
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void *cpu_init_fn;
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void *thread_info;
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} stack_start;
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int __cpu_up(unsigned int cpu, struct task_struct *tsk)
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{
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unsigned long timeout;
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per_cpu(cpu_state, cpu) = CPU_UP_PREPARE;
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/* Fill in data in head.S for secondary cpus */
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stack_start.sp = tsk->thread.sp;
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stack_start.thread_info = tsk->stack;
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stack_start.bss_start = 0; /* don't clear bss for secondary cpus */
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stack_start.start_kernel_fn = start_secondary;
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flush_icache_range((unsigned long)&stack_start,
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(unsigned long)&stack_start + sizeof(stack_start));
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wmb();
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mp_ops->start_cpu(cpu, (unsigned long)_stext);
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timeout = jiffies + HZ;
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while (time_before(jiffies, timeout)) {
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if (cpu_online(cpu))
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break;
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udelay(10);
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barrier();
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}
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if (cpu_online(cpu))
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return 0;
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return -ENOENT;
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}
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void __init smp_cpus_done(unsigned int max_cpus)
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{
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unsigned long bogosum = 0;
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int cpu;
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for_each_online_cpu(cpu)
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bogosum += cpu_data[cpu].loops_per_jiffy;
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printk(KERN_INFO "SMP: Total of %d processors activated "
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"(%lu.%02lu BogoMIPS).\n", num_online_cpus(),
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bogosum / (500000/HZ),
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(bogosum / (5000/HZ)) % 100);
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}
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void smp_send_reschedule(int cpu)
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{
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mp_ops->send_ipi(cpu, SMP_MSG_RESCHEDULE);
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}
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void smp_send_stop(void)
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{
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smp_call_function(stop_this_cpu, 0, 0);
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}
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void arch_send_call_function_ipi_mask(const struct cpumask *mask)
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{
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int cpu;
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for_each_cpu(cpu, mask)
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mp_ops->send_ipi(cpu, SMP_MSG_FUNCTION);
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}
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void arch_send_call_function_single_ipi(int cpu)
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{
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mp_ops->send_ipi(cpu, SMP_MSG_FUNCTION_SINGLE);
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}
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#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
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void tick_broadcast(const struct cpumask *mask)
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{
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int cpu;
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for_each_cpu(cpu, mask)
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mp_ops->send_ipi(cpu, SMP_MSG_TIMER);
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}
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static void ipi_timer(void)
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{
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irq_enter();
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tick_receive_broadcast();
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irq_exit();
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}
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#endif
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void smp_message_recv(unsigned int msg)
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{
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switch (msg) {
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case SMP_MSG_FUNCTION:
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generic_smp_call_function_interrupt();
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break;
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case SMP_MSG_RESCHEDULE:
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scheduler_ipi();
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break;
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case SMP_MSG_FUNCTION_SINGLE:
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generic_smp_call_function_single_interrupt();
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break;
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#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
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case SMP_MSG_TIMER:
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ipi_timer();
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break;
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#endif
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default:
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printk(KERN_WARNING "SMP %d: %s(): unknown IPI %d\n",
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smp_processor_id(), __func__, msg);
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break;
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}
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}
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/* Not really SMP stuff ... */
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int setup_profiling_timer(unsigned int multiplier)
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{
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return 0;
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}
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#ifdef CONFIG_MMU
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static void flush_tlb_all_ipi(void *info)
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{
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local_flush_tlb_all();
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}
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void flush_tlb_all(void)
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{
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on_each_cpu(flush_tlb_all_ipi, 0, 1);
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}
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static void flush_tlb_mm_ipi(void *mm)
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{
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local_flush_tlb_mm((struct mm_struct *)mm);
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}
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/*
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* The following tlb flush calls are invoked when old translations are
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* being torn down, or pte attributes are changing. For single threaded
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* address spaces, a new context is obtained on the current cpu, and tlb
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* context on other cpus are invalidated to force a new context allocation
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* at switch_mm time, should the mm ever be used on other cpus. For
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* multithreaded address spaces, intercpu interrupts have to be sent.
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* Another case where intercpu interrupts are required is when the target
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* mm might be active on another cpu (eg debuggers doing the flushes on
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* behalf of debugees, kswapd stealing pages from another process etc).
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* Kanoj 07/00.
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*/
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void flush_tlb_mm(struct mm_struct *mm)
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{
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preempt_disable();
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if ((atomic_read(&mm->mm_users) != 1) || (current->mm != mm)) {
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smp_call_function(flush_tlb_mm_ipi, (void *)mm, 1);
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} else {
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int i;
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for_each_online_cpu(i)
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if (smp_processor_id() != i)
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cpu_context(i, mm) = 0;
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}
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local_flush_tlb_mm(mm);
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preempt_enable();
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}
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struct flush_tlb_data {
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struct vm_area_struct *vma;
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unsigned long addr1;
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unsigned long addr2;
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};
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static void flush_tlb_range_ipi(void *info)
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{
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struct flush_tlb_data *fd = (struct flush_tlb_data *)info;
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local_flush_tlb_range(fd->vma, fd->addr1, fd->addr2);
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}
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void flush_tlb_range(struct vm_area_struct *vma,
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unsigned long start, unsigned long end)
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{
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struct mm_struct *mm = vma->vm_mm;
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preempt_disable();
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if ((atomic_read(&mm->mm_users) != 1) || (current->mm != mm)) {
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struct flush_tlb_data fd;
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fd.vma = vma;
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fd.addr1 = start;
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fd.addr2 = end;
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smp_call_function(flush_tlb_range_ipi, (void *)&fd, 1);
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} else {
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int i;
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for_each_online_cpu(i)
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if (smp_processor_id() != i)
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cpu_context(i, mm) = 0;
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}
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local_flush_tlb_range(vma, start, end);
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preempt_enable();
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}
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static void flush_tlb_kernel_range_ipi(void *info)
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{
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struct flush_tlb_data *fd = (struct flush_tlb_data *)info;
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local_flush_tlb_kernel_range(fd->addr1, fd->addr2);
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}
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void flush_tlb_kernel_range(unsigned long start, unsigned long end)
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{
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struct flush_tlb_data fd;
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fd.addr1 = start;
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fd.addr2 = end;
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on_each_cpu(flush_tlb_kernel_range_ipi, (void *)&fd, 1);
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}
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static void flush_tlb_page_ipi(void *info)
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{
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struct flush_tlb_data *fd = (struct flush_tlb_data *)info;
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local_flush_tlb_page(fd->vma, fd->addr1);
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}
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void flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
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{
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preempt_disable();
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if ((atomic_read(&vma->vm_mm->mm_users) != 1) ||
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(current->mm != vma->vm_mm)) {
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struct flush_tlb_data fd;
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fd.vma = vma;
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fd.addr1 = page;
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smp_call_function(flush_tlb_page_ipi, (void *)&fd, 1);
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} else {
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int i;
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for_each_online_cpu(i)
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if (smp_processor_id() != i)
|
|
cpu_context(i, vma->vm_mm) = 0;
|
|
}
|
|
local_flush_tlb_page(vma, page);
|
|
preempt_enable();
|
|
}
|
|
|
|
static void flush_tlb_one_ipi(void *info)
|
|
{
|
|
struct flush_tlb_data *fd = (struct flush_tlb_data *)info;
|
|
local_flush_tlb_one(fd->addr1, fd->addr2);
|
|
}
|
|
|
|
void flush_tlb_one(unsigned long asid, unsigned long vaddr)
|
|
{
|
|
struct flush_tlb_data fd;
|
|
|
|
fd.addr1 = asid;
|
|
fd.addr2 = vaddr;
|
|
|
|
smp_call_function(flush_tlb_one_ipi, (void *)&fd, 1);
|
|
local_flush_tlb_one(asid, vaddr);
|
|
}
|
|
|
|
#endif
|