diff options
| author | Graf Yang <graf.yang@analog.com> | 2008-11-18 17:48:22 +0800 |
|---|---|---|
| committer | Bryan Wu <cooloney@kernel.org> | 2008-11-18 17:48:22 +0800 |
| commit | b8a989893cbdeb6c97a7b5af5f38fb0e480235f9 (patch) | |
| tree | 658cf6df93dac687f0d6b94111d0f53b3dd0177c /arch/blackfin/include/asm/mmu_context.h | |
| parent | 6b3087c64a92a36ae20d33479b4df6d7afc910d4 (diff) | |
Blackfin arch: SMP supporting patchset: Blackfin CPLB related code
Blackfin dual core BF561 processor can support SMP like features.
https://docs.blackfin.uclinux.org/doku.php?id=linux-kernel:smp-like
In this patch, we provide SMP extend to Blackfin CPLB related code
Signed-off-by: Graf Yang <graf.yang@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
Diffstat (limited to 'arch/blackfin/include/asm/mmu_context.h')
| -rw-r--r-- | arch/blackfin/include/asm/mmu_context.h | 27 |
1 files changed, 19 insertions, 8 deletions
diff --git a/arch/blackfin/include/asm/mmu_context.h b/arch/blackfin/include/asm/mmu_context.h index 35593dda2a4..944e29faae4 100644 --- a/arch/blackfin/include/asm/mmu_context.h +++ b/arch/blackfin/include/asm/mmu_context.h @@ -37,6 +37,10 @@ #include <asm/pgalloc.h> #include <asm/cplbinit.h> +/* Note: L1 stacks are CPU-private things, so we bluntly disable this + feature in SMP mode, and use the per-CPU scratch SRAM bank only to + store the PDA instead. */ + extern void *current_l1_stack_save; extern int nr_l1stack_tasks; extern void *l1_stack_base; @@ -88,12 +92,15 @@ activate_l1stack(struct mm_struct *mm, unsigned long sp_base) static inline void switch_mm(struct mm_struct *prev_mm, struct mm_struct *next_mm, struct task_struct *tsk) { +#ifdef CONFIG_MPU + unsigned int cpu = smp_processor_id(); +#endif if (prev_mm == next_mm) return; #ifdef CONFIG_MPU - if (prev_mm->context.page_rwx_mask == current_rwx_mask) { - flush_switched_cplbs(); - set_mask_dcplbs(next_mm->context.page_rwx_mask); + if (prev_mm->context.page_rwx_mask == current_rwx_mask[cpu]) { + flush_switched_cplbs(cpu); + set_mask_dcplbs(next_mm->context.page_rwx_mask, cpu); } #endif @@ -138,9 +145,10 @@ static inline void protect_page(struct mm_struct *mm, unsigned long addr, static inline void update_protections(struct mm_struct *mm) { - if (mm->context.page_rwx_mask == current_rwx_mask) { - flush_switched_cplbs(); - set_mask_dcplbs(mm->context.page_rwx_mask); + unsigned int cpu = smp_processor_id(); + if (mm->context.page_rwx_mask == current_rwx_mask[cpu]) { + flush_switched_cplbs(cpu); + set_mask_dcplbs(mm->context.page_rwx_mask, cpu); } } #endif @@ -165,6 +173,9 @@ init_new_context(struct task_struct *tsk, struct mm_struct *mm) static inline void destroy_context(struct mm_struct *mm) { struct sram_list_struct *tmp; +#ifdef CONFIG_MPU + unsigned int cpu = smp_processor_id(); +#endif #ifdef CONFIG_APP_STACK_L1 if (current_l1_stack_save == mm->context.l1_stack_save) @@ -179,8 +190,8 @@ static inline void destroy_context(struct mm_struct *mm) kfree(tmp); } #ifdef CONFIG_MPU - if (current_rwx_mask == mm->context.page_rwx_mask) - current_rwx_mask = NULL; + if (current_rwx_mask[cpu] == mm->context.page_rwx_mask) + current_rwx_mask[cpu] = NULL; free_pages((unsigned long)mm->context.page_rwx_mask, page_mask_order); #endif } |