| #ifndef _S390_TLBFLUSH_H |
| #define _S390_TLBFLUSH_H |
| |
| #include <linux/mm.h> |
| #include <linux/sched.h> |
| #include <asm/processor.h> |
| #include <asm/pgalloc.h> |
| #include <asm/pgtable.h> |
| |
| /* |
| * Flush all TLB entries on the local CPU. |
| */ |
| static inline void __tlb_flush_local(void) |
| { |
| asm volatile("ptlb" : : : "memory"); |
| } |
| |
| /* |
| * Flush TLB entries for a specific ASCE on all CPUs |
| */ |
| static inline void __tlb_flush_idte(unsigned long asce) |
| { |
| /* Global TLB flush for the mm */ |
| asm volatile( |
| " .insn rrf,0xb98e0000,0,%0,%1,0" |
| : : "a" (2048), "a" (asce) : "cc"); |
| } |
| |
| #ifdef CONFIG_SMP |
| void smp_ptlb_all(void); |
| |
| /* |
| * Flush all TLB entries on all CPUs. |
| */ |
| static inline void __tlb_flush_global(void) |
| { |
| unsigned int dummy = 0; |
| |
| csp(&dummy, 0, 0); |
| } |
| |
| /* |
| * Flush TLB entries for a specific mm on all CPUs (in case gmap is used |
| * this implicates multiple ASCEs!). |
| */ |
| static inline void __tlb_flush_full(struct mm_struct *mm) |
| { |
| preempt_disable(); |
| atomic_inc(&mm->context.flush_count); |
| if (cpumask_equal(mm_cpumask(mm), cpumask_of(smp_processor_id()))) { |
| /* Local TLB flush */ |
| __tlb_flush_local(); |
| } else { |
| /* Global TLB flush */ |
| __tlb_flush_global(); |
| /* Reset TLB flush mask */ |
| cpumask_copy(mm_cpumask(mm), &mm->context.cpu_attach_mask); |
| } |
| atomic_dec(&mm->context.flush_count); |
| preempt_enable(); |
| } |
| |
| static inline void __tlb_flush_mm(struct mm_struct *mm) |
| { |
| unsigned long gmap_asce; |
| |
| /* |
| * 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. |
| */ |
| preempt_disable(); |
| atomic_inc(&mm->context.flush_count); |
| gmap_asce = READ_ONCE(mm->context.gmap_asce); |
| if (MACHINE_HAS_IDTE && gmap_asce != -1UL) { |
| if (gmap_asce) |
| __tlb_flush_idte(gmap_asce); |
| __tlb_flush_idte(mm->context.asce); |
| } else { |
| __tlb_flush_full(mm); |
| } |
| /* Reset TLB flush mask */ |
| cpumask_copy(mm_cpumask(mm), &mm->context.cpu_attach_mask); |
| atomic_dec(&mm->context.flush_count); |
| preempt_enable(); |
| } |
| |
| static inline void __tlb_flush_kernel(void) |
| { |
| if (MACHINE_HAS_IDTE) |
| __tlb_flush_idte(init_mm.context.asce); |
| else |
| __tlb_flush_global(); |
| } |
| #else |
| #define __tlb_flush_global() __tlb_flush_local() |
| #define __tlb_flush_full(mm) __tlb_flush_local() |
| |
| /* |
| * Flush TLB entries for a specific ASCE on all CPUs. |
| */ |
| static inline void __tlb_flush_mm(struct mm_struct *mm) |
| { |
| __tlb_flush_local(); |
| } |
| |
| static inline void __tlb_flush_kernel(void) |
| { |
| __tlb_flush_local(); |
| } |
| #endif |
| |
| static inline void __tlb_flush_mm_lazy(struct mm_struct * mm) |
| { |
| if (mm->context.flush_mm) { |
| __tlb_flush_mm(mm); |
| mm->context.flush_mm = 0; |
| } |
| } |
| |
| /* |
| * 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_lazy(mm); |
| } |
| |
| static inline void flush_tlb_range(struct vm_area_struct *vma, |
| unsigned long start, unsigned long end) |
| { |
| __tlb_flush_mm_lazy(vma->vm_mm); |
| } |
| |
| static inline void flush_tlb_kernel_range(unsigned long start, |
| unsigned long end) |
| { |
| __tlb_flush_kernel(); |
| } |
| |
| #endif /* _S390_TLBFLUSH_H */ |