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powerpc/mm: Abstraction for switch_mmu_context()

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How we switch MMU context differs between hash and radix. For hash we
need to switch the SLB details and for radix we need to switch the PID
SPR.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Aneesh Kumar K.V
2016-04-29 23:26:01 +10:00
committed by Michael Ellerman
parent d9225ad923
commit d2adba3fd1
5 changed files with 19 additions and 17 deletions
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25
arch/powerpc/include/asm/mmu_context.h
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@@ -33,16 +33,23 @@ extern long mm_iommu_ua_to_hpa(struct mm_iommu_table_group_mem_t *mem,
extern long mm_iommu_mapped_inc(struct mm_iommu_table_group_mem_t *mem);
extern void mm_iommu_mapped_dec(struct mm_iommu_table_group_mem_t *mem);
#endif
extern void switch_mmu_context(struct mm_struct *prev, struct mm_struct *next);
extern void switch_slb(struct task_struct *tsk, struct mm_struct *mm);
extern void set_context(unsigned long id, pgd_t *pgd);
#ifdef CONFIG_PPC_BOOK3S_64
static inline void switch_mmu_context(struct mm_struct *prev,
struct mm_struct *next,
struct task_struct *tsk)
{
return switch_slb(tsk, next);
}
extern int __init_new_context(void);
extern void __destroy_context(int context_id);
static inline void mmu_context_init(void) { }
#else
extern void switch_mmu_context(struct mm_struct *prev, struct mm_struct *next,
struct task_struct *tsk);
extern unsigned long __init_new_context(void);
extern void __destroy_context(unsigned long context_id);
extern void mmu_context_init(void);
@@ -88,17 +95,11 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
if (cpu_has_feature(CPU_FTR_ALTIVEC))
asm volatile ("dssall");
#endif /* CONFIG_ALTIVEC */
/* The actual HW switching method differs between the various
* sub architectures.
/*
* The actual HW switching method differs between the various
* sub architectures. Out of line for now
*/
#ifdef CONFIG_PPC_STD_MMU_64
switch_slb(tsk, next);
#else
/* Out of line for now */
switch_mmu_context(prev, next);
#endif
switch_mmu_context(prev, next, tsk);
}
#define deactivate_mm(tsk,mm) do { } while (0)