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05/09/2024 07:14:13 AM
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Kbuild
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tlbflush.h
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Editing: tlbflush.h
Close
/* * Copyright 2010 Tilera Corporation. All Rights Reserved. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation, version 2. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or * NON INFRINGEMENT. See the GNU General Public License for * more details. */ #ifndef _ASM_TILE_TLBFLUSH_H #define _ASM_TILE_TLBFLUSH_H #include <linux/mm.h> #include <linux/sched.h> #include <linux/smp.h> #include <asm/cacheflush.h> #include <asm/page.h> #include <hv/hypervisor.h> /* * Rather than associating each mm with its own ASID, we just use * ASIDs to allow us to lazily flush the TLB when we switch mms. * This way we only have to do an actual TLB flush on mm switch * every time we wrap ASIDs, not every single time we switch. * * FIXME: We might improve performance by keeping ASIDs around * properly, though since the hypervisor direct-maps VAs to TSB * entries, we're likely to have lost at least the executable page * mappings by the time we switch back to the original mm. */ DECLARE_PER_CPU(int, current_asid); /* The hypervisor tells us what ASIDs are available to us. */ extern int min_asid, max_asid; /* Pass as vma pointer for non-executable mapping, if no vma available. */ #define FLUSH_NONEXEC ((struct vm_area_struct *)-1UL) /* Flush a single user page on this cpu. */ static inline void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long addr, unsigned long page_size) { int rc = hv_flush_page(addr, page_size); if (rc < 0) panic("hv_flush_page(%#lx,%#lx) failed: %d", addr, page_size, rc); if (!vma || (vma != FLUSH_NONEXEC && (vma->vm_flags & VM_EXEC))) __flush_icache(); } /* Flush range of user pages on this cpu. */ static inline void local_flush_tlb_pages(struct vm_area_struct *vma, unsigned long addr, unsigned long page_size, unsigned long len) { int rc = hv_flush_pages(addr, page_size, len); if (rc < 0) panic("hv_flush_pages(%#lx,%#lx,%#lx) failed: %d", addr, page_size, len, rc); if (!vma || (vma != FLUSH_NONEXEC && (vma->vm_flags & VM_EXEC))) __flush_icache(); } /* Flush all user pages on this cpu. */ static inline void local_flush_tlb(void) { int rc = hv_flush_all(1); /* preserve global mappings */ if (rc < 0) panic("hv_flush_all(1) failed: %d", rc); __flush_icache(); } /* * Global pages have to be flushed a bit differently. Not a real * performance problem because this does not happen often. */ static inline void local_flush_tlb_all(void) { int i; for (i = 0; ; ++i) { HV_VirtAddrRange r = hv_inquire_virtual(i); if (r.size == 0) break; local_flush_tlb_pages(NULL, r.start, PAGE_SIZE, r.size); local_flush_tlb_pages(NULL, r.start, HPAGE_SIZE, r.size); } } /* * 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_others(cpumask, mm, va) flushes TLBs on other cpus * * Here (as in vm_area_struct), "end" means the first byte after * our end address. */ extern void flush_tlb_all(void); extern void flush_tlb_kernel_range(unsigned long start, unsigned long end); extern void flush_tlb_current_task(void); extern void flush_tlb_mm(struct mm_struct *); extern void flush_tlb_page(struct vm_area_struct *, unsigned long); extern void flush_tlb_page_mm(struct vm_area_struct *, struct mm_struct *, unsigned long); extern void flush_tlb_range(struct vm_area_struct *, unsigned long start, unsigned long end); #define flush_tlb() flush_tlb_current_task() #endif /* _ASM_TILE_TLBFLUSH_H */