Contributors: 16
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Benjamin Herrenschmidt |
120 |
34.99% |
8 |
22.86% |
| Christophe Leroy |
81 |
23.62% |
5 |
14.29% |
| Nicholas Piggin |
32 |
9.33% |
4 |
11.43% |
| Anton Blanchard |
30 |
8.75% |
2 |
5.71% |
| Paul Mackerras |
16 |
4.66% |
3 |
8.57% |
| Andrew Morton |
15 |
4.37% |
3 |
8.57% |
| Laurent Dufour |
12 |
3.50% |
1 |
2.86% |
| David Gibson |
9 |
2.62% |
1 |
2.86% |
| Kumar Gala |
7 |
2.04% |
1 |
2.86% |
| Rusty Russell |
6 |
1.75% |
1 |
2.86% |
| Mathieu Desnoyers |
4 |
1.17% |
1 |
2.86% |
| Aneesh Kumar K.V |
3 |
0.87% |
1 |
2.86% |
| Olof Johansson |
3 |
0.87% |
1 |
2.86% |
| Thomas Gleixner |
2 |
0.58% |
1 |
2.86% |
| Linus Torvalds (pre-git) |
2 |
0.58% |
1 |
2.86% |
| Alexey Kardashevskiy |
1 |
0.29% |
1 |
2.86% |
| Total |
343 |
|
35 |
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Common implementation of switch_mm_irqs_off
*
* Copyright IBM Corp. 2017
*/
#include <linux/mm.h>
#include <linux/cpu.h>
#include <linux/sched/mm.h>
#include <asm/mmu_context.h>
#include <asm/pgalloc.h>
#if defined(CONFIG_PPC32)
static inline void switch_mm_pgdir(struct task_struct *tsk,
struct mm_struct *mm)
{
/* 32-bit keeps track of the current PGDIR in the thread struct */
tsk->thread.pgdir = mm->pgd;
#ifdef CONFIG_PPC_BOOK3S_32
tsk->thread.sr0 = mm->context.sr0;
#endif
#if defined(CONFIG_BOOKE_OR_40x) && defined(CONFIG_PPC_KUAP)
tsk->thread.pid = mm->context.id;
#endif
}
#elif defined(CONFIG_PPC_BOOK3E_64)
static inline void switch_mm_pgdir(struct task_struct *tsk,
struct mm_struct *mm)
{
/* 64-bit Book3E keeps track of current PGD in the PACA */
get_paca()->pgd = mm->pgd;
#ifdef CONFIG_PPC_KUAP
tsk->thread.pid = mm->context.id;
#endif
}
#else
static inline void switch_mm_pgdir(struct task_struct *tsk,
struct mm_struct *mm) { }
#endif
void switch_mm_irqs_off(struct mm_struct *prev, struct mm_struct *next,
struct task_struct *tsk)
{
int cpu = smp_processor_id();
bool new_on_cpu = false;
/* Mark this context has been used on the new CPU */
if (!cpumask_test_cpu(cpu, mm_cpumask(next))) {
VM_WARN_ON_ONCE(next == &init_mm);
cpumask_set_cpu(cpu, mm_cpumask(next));
inc_mm_active_cpus(next);
/*
* This full barrier orders the store to the cpumask above vs
* a subsequent load which allows this CPU/MMU to begin loading
* translations for 'next' from page table PTEs into the TLB.
*
* When using the radix MMU, that operation is the load of the
* MMU context id, which is then moved to SPRN_PID.
*
* For the hash MMU it is either the first load from slb_cache
* in switch_slb() to preload the SLBs, or the load of
* get_user_context which loads the context for the VSID hash
* to insert a new SLB, in the SLB fault handler.
*
* On the other side, the barrier is in mm/tlb-radix.c for
* radix which orders earlier stores to clear the PTEs before
* the load of mm_cpumask to check which CPU TLBs should be
* flushed. For hash, pte_xchg to clear the PTE includes the
* barrier.
*
* This full barrier is also needed by membarrier when
* switching between processes after store to rq->curr, before
* user-space memory accesses.
*/
smp_mb();
new_on_cpu = true;
}
/* Some subarchs need to track the PGD elsewhere */
switch_mm_pgdir(tsk, next);
/* Nothing else to do if we aren't actually switching */
if (prev == next)
return;
/*
* We must stop all altivec streams before changing the HW
* context
*/
if (cpu_has_feature(CPU_FTR_ALTIVEC))
asm volatile (PPC_DSSALL);
if (!new_on_cpu)
membarrier_arch_switch_mm(prev, next, tsk);
/*
* The actual HW switching method differs between the various
* sub architectures. Out of line for now
*/
switch_mmu_context(prev, next, tsk);
VM_WARN_ON_ONCE(!cpumask_test_cpu(cpu, mm_cpumask(prev)));
}
#ifndef CONFIG_PPC_BOOK3S_64
void arch_exit_mmap(struct mm_struct *mm)
{
void *frag = pte_frag_get(&mm->context);
if (frag)
pte_frag_destroy(frag);
}
#endif