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author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2008-08-01 22:42:05 +0400 |
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committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2008-08-01 22:42:05 +0400 |
commit | c6557e7f2b6ae76a44653d38f835174074c42e05 (patch) | |
tree | da619a76b309cb1cd259d082af768a83cfcd6d52 /arch/s390/include/asm/tlbflush.h | |
parent | ab4227cb2d936886069ef1056c02500d05beb15d (diff) | |
download | linux-c6557e7f2b6ae76a44653d38f835174074c42e05.tar.xz |
[S390] move include/asm-s390 to arch/s390/include/asm
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/include/asm/tlbflush.h')
-rw-r--r-- | arch/s390/include/asm/tlbflush.h | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/arch/s390/include/asm/tlbflush.h b/arch/s390/include/asm/tlbflush.h new file mode 100644 index 000000000000..d60394b9745e --- /dev/null +++ b/arch/s390/include/asm/tlbflush.h @@ -0,0 +1,140 @@ +#ifndef _S390_TLBFLUSH_H +#define _S390_TLBFLUSH_H + +#include <linux/mm.h> +#include <linux/sched.h> +#include <asm/processor.h> +#include <asm/pgalloc.h> + +/* + * Flush all tlb entries on the local cpu. + */ +static inline void __tlb_flush_local(void) +{ + asm volatile("ptlb" : : : "memory"); +} + +#ifdef CONFIG_SMP +/* + * Flush all tlb entries on all cpus. + */ +void smp_ptlb_all(void); + +static inline void __tlb_flush_global(void) +{ + register unsigned long reg2 asm("2"); + register unsigned long reg3 asm("3"); + register unsigned long reg4 asm("4"); + long dummy; + +#ifndef __s390x__ + if (!MACHINE_HAS_CSP) { + smp_ptlb_all(); + return; + } +#endif /* __s390x__ */ + + dummy = 0; + reg2 = reg3 = 0; + reg4 = ((unsigned long) &dummy) + 1; + asm volatile( + " csp %0,%2" + : : "d" (reg2), "d" (reg3), "d" (reg4), "m" (dummy) : "cc" ); +} + +static inline void __tlb_flush_full(struct mm_struct *mm) +{ + cpumask_t local_cpumask; + + preempt_disable(); + /* + * If the process only ran on the local cpu, do a local flush. + */ + local_cpumask = cpumask_of_cpu(smp_processor_id()); + if (cpus_equal(mm->cpu_vm_mask, local_cpumask)) + __tlb_flush_local(); + else + __tlb_flush_global(); + preempt_enable(); +} +#else +#define __tlb_flush_full(mm) __tlb_flush_local() +#endif + +/* + * Flush all tlb entries of a page table on all cpus. + */ +static inline void __tlb_flush_idte(unsigned long asce) +{ + asm volatile( + " .insn rrf,0xb98e0000,0,%0,%1,0" + : : "a" (2048), "a" (asce) : "cc" ); +} + +static inline void __tlb_flush_mm(struct mm_struct * mm) +{ + if (unlikely(cpus_empty(mm->cpu_vm_mask))) + return; + /* + * If the machine has IDTE we prefer to do a per mm flush + * on all cpus instead of doing a local flush if the mm + * only ran on the local cpu. + */ + if (MACHINE_HAS_IDTE) { + if (mm->context.noexec) + __tlb_flush_idte((unsigned long) + get_shadow_table(mm->pgd) | + mm->context.asce_bits); + __tlb_flush_idte((unsigned long) mm->pgd | + mm->context.asce_bits); + return; + } + __tlb_flush_full(mm); +} + +static inline void __tlb_flush_mm_cond(struct mm_struct * mm) +{ + if (atomic_read(&mm->mm_users) <= 1 && mm == current->active_mm) + __tlb_flush_mm(mm); +} + +/* + * TLB flushing: + * flush_tlb() - flushes the current mm struct TLBs + * flush_tlb_all() - flushes all processes TLBs + * flush_tlb_mm(mm) - flushes the specified mm context TLB's + * flush_tlb_page(vma, vmaddr) - flushes one page + * flush_tlb_range(vma, start, end) - flushes a range of pages + * flush_tlb_kernel_range(start, end) - flushes a range of kernel pages + */ + +/* + * flush_tlb_mm goes together with ptep_set_wrprotect for the + * copy_page_range operation and flush_tlb_range is related to + * ptep_get_and_clear for change_protection. ptep_set_wrprotect and + * ptep_get_and_clear do not flush the TLBs directly if the mm has + * only one user. At the end of the update the flush_tlb_mm and + * flush_tlb_range functions need to do the flush. + */ +#define flush_tlb() do { } while (0) +#define flush_tlb_all() do { } while (0) +#define flush_tlb_page(vma, addr) do { } while (0) + +static inline void flush_tlb_mm(struct mm_struct *mm) +{ + __tlb_flush_mm_cond(mm); +} + +static inline void flush_tlb_range(struct vm_area_struct *vma, + unsigned long start, unsigned long end) +{ + __tlb_flush_mm_cond(vma->vm_mm); +} + +static inline void flush_tlb_kernel_range(unsigned long start, + unsigned long end) +{ + __tlb_flush_mm(&init_mm); +} + +#endif /* _S390_TLBFLUSH_H */ |