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/*
* 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 */
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