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authorAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>2016-04-29 23:26:01 +1000
committerMichael Ellerman <mpe@ellerman.id.au>2016-05-01 18:33:04 +1000
commitd2adba3fd137b46903dad813e2a4777b96c85e0f (patch)
tree42f883e56fd897d308ec1e3620e5d4692425da8e /arch
parentd9225ad923514252ec8d10dac67e5a7a2f0aa345 (diff)
powerpc/mm: Abstraction for switch_mmu_context()
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>
Diffstat (limited to 'arch')
-rw-r--r--arch/powerpc/include/asm/mmu_context.h25
-rw-r--r--arch/powerpc/kernel/swsusp.c2
-rw-r--r--arch/powerpc/mm/mmu_context_nohash.c3
3 files changed, 16 insertions, 14 deletions
diff --git a/arch/powerpc/include/asm/mmu_context.h b/arch/powerpc/include/asm/mmu_context.h
index 4eaab40e3ade..4e2a29443384 100644
--- a/arch/powerpc/include/asm/mmu_context.h
+++ b/arch/powerpc/include/asm/mmu_context.h
@@ -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)
diff --git a/arch/powerpc/kernel/swsusp.c b/arch/powerpc/kernel/swsusp.c
index 6669b1752512..6ae9bd5086a4 100644
--- a/arch/powerpc/kernel/swsusp.c
+++ b/arch/powerpc/kernel/swsusp.c
@@ -31,6 +31,6 @@ void save_processor_state(void)
void restore_processor_state(void)
{
#ifdef CONFIG_PPC32
- switch_mmu_context(current->active_mm, current->active_mm);
+ switch_mmu_context(current->active_mm, current->active_mm, NULL);
#endif
}
diff --git a/arch/powerpc/mm/mmu_context_nohash.c b/arch/powerpc/mm/mmu_context_nohash.c
index 986afbc22c76..a36c43a27893 100644
--- a/arch/powerpc/mm/mmu_context_nohash.c
+++ b/arch/powerpc/mm/mmu_context_nohash.c
@@ -226,7 +226,8 @@ static void context_check_map(void)
static void context_check_map(void) { }
#endif
-void switch_mmu_context(struct mm_struct *prev, struct mm_struct *next)
+void switch_mmu_context(struct mm_struct *prev, struct mm_struct *next,
+ struct task_struct *tsk)
{
unsigned int i, id, cpu = smp_processor_id();
unsigned long *map;