From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! --- include/asm-s390/tlbflush.h | 153 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 153 insertions(+) create mode 100644 include/asm-s390/tlbflush.h (limited to 'include/asm-s390/tlbflush.h') diff --git a/include/asm-s390/tlbflush.h b/include/asm-s390/tlbflush.h new file mode 100644 index 000000000000..1bb73b0e61fa --- /dev/null +++ b/include/asm-s390/tlbflush.h @@ -0,0 +1,153 @@ +#ifndef _S390_TLBFLUSH_H +#define _S390_TLBFLUSH_H + +#include +#include +#include + +/* + * 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_pgtables(mm, start, end) flushes a range of page tables + */ + +/* + * S/390 has three ways of flushing TLBs + * 'ptlb' does a flush of the local processor + * 'csp' flushes the TLBs on all PUs of a SMP + * 'ipte' invalidates a pte in a page table and flushes that out of + * the TLBs of all PUs of a SMP + */ + +#define local_flush_tlb() \ +do { __asm__ __volatile__("ptlb": : :"memory"); } while (0) + +#ifndef CONFIG_SMP + +/* + * We always need to flush, since s390 does not flush tlb + * on each context switch + */ + +static inline void flush_tlb(void) +{ + local_flush_tlb(); +} +static inline void flush_tlb_all(void) +{ + local_flush_tlb(); +} +static inline void flush_tlb_mm(struct mm_struct *mm) +{ + local_flush_tlb(); +} +static inline void flush_tlb_page(struct vm_area_struct *vma, + unsigned long addr) +{ + local_flush_tlb(); +} +static inline void flush_tlb_range(struct vm_area_struct *vma, + unsigned long start, unsigned long end) +{ + local_flush_tlb(); +} + +#define flush_tlb_kernel_range(start, end) \ + local_flush_tlb(); + +#else + +#include + +extern void smp_ptlb_all(void); + +static inline void global_flush_tlb(void) +{ +#ifndef __s390x__ + if (!MACHINE_HAS_CSP) { + smp_ptlb_all(); + return; + } +#endif /* __s390x__ */ + { + register unsigned long addr asm("4"); + long dummy; + + dummy = 0; + addr = ((unsigned long) &dummy) + 1; + __asm__ __volatile__ ( + " slr 2,2\n" + " slr 3,3\n" + " csp 2,%0" + : : "a" (addr), "m" (dummy) : "cc", "2", "3" ); + } +} + +/* + * We only have to do global flush of tlb if process run since last + * flush on any other pu than current. + * If we have threads (mm->count > 1) we always do a global flush, + * since the process runs on more than one processor at the same time. + */ + +static inline void __flush_tlb_mm(struct mm_struct * mm) +{ + cpumask_t local_cpumask; + + if (unlikely(cpus_empty(mm->cpu_vm_mask))) + return; + if (MACHINE_HAS_IDTE) { + asm volatile (".insn rrf,0xb98e0000,0,%0,%1,0" + : : "a" (2048), + "a" (__pa(mm->pgd)&PAGE_MASK) : "cc" ); + return; + } + preempt_disable(); + local_cpumask = cpumask_of_cpu(smp_processor_id()); + if (cpus_equal(mm->cpu_vm_mask, local_cpumask)) + local_flush_tlb(); + else + global_flush_tlb(); + preempt_enable(); +} + +static inline void flush_tlb(void) +{ + __flush_tlb_mm(current->mm); +} +static inline void flush_tlb_all(void) +{ + global_flush_tlb(); +} +static inline void flush_tlb_mm(struct mm_struct *mm) +{ + __flush_tlb_mm(mm); +} +static inline void flush_tlb_page(struct vm_area_struct *vma, + unsigned long addr) +{ + __flush_tlb_mm(vma->vm_mm); +} +static inline void flush_tlb_range(struct vm_area_struct *vma, + unsigned long start, unsigned long end) +{ + __flush_tlb_mm(vma->vm_mm); +} + +#define flush_tlb_kernel_range(start, end) global_flush_tlb() + +#endif + +static inline void flush_tlb_pgtables(struct mm_struct *mm, + unsigned long start, unsigned long end) +{ + /* S/390 does not keep any page table caches in TLB */ +} + +#endif /* _S390_TLBFLUSH_H */ -- cgit v1.2.3