[mirror_ubuntu-bionic-kernel.git] / include / asm-parisc / tlbflush.h

#ifndef _PARISC_TLBFLUSH_H
#define _PARISC_TLBFLUSH_H

/* TLB flushing routines.... */

#include <linux/config.h>
#include <linux/mm.h>
#include <asm/mmu_context.h>


/* This is for the serialisation of PxTLB broadcasts.  At least on the
 * N class systems, only one PxTLB inter processor broadcast can be
 * active at any one time on the Merced bus.  This tlb purge
 * synchronisation is fairly lightweight and harmless so we activate
 * it on all SMP systems not just the N class. */
#ifdef CONFIG_SMP
extern spinlock_t pa_tlb_lock;

#define purge_tlb_start(x) spin_lock(&pa_tlb_lock)
#define purge_tlb_end(x) spin_unlock(&pa_tlb_lock)

#else

#define purge_tlb_start(x) do { } while(0)
#define purge_tlb_end(x) do { } while (0)

#endif


extern void flush_tlb_all(void);

/*
 * flush_tlb_mm()
 *
 * XXX This code is NOT valid for HP-UX compatibility processes,
 * (although it will probably work 99% of the time). HP-UX
 * processes are free to play with the space id's and save them
 * over long periods of time, etc. so we have to preserve the
 * space and just flush the entire tlb. We need to check the
 * personality in order to do that, but the personality is not
 * currently being set correctly.
 *
 * Of course, Linux processes could do the same thing, but
 * we don't support that (and the compilers, dynamic linker,
 * etc. do not do that).
 */

static inline void flush_tlb_mm(struct mm_struct *mm)
{
	BUG_ON(mm == &init_mm); /* Should never happen */

#ifdef CONFIG_SMP
	flush_tlb_all();
#else
	if (mm) {
		if (mm->context != 0)
			free_sid(mm->context);
		mm->context = alloc_sid();
		if (mm == current->active_mm)
			load_context(mm->context);
	}
#endif
}

extern __inline__ void flush_tlb_pgtables(struct mm_struct *mm, unsigned long start, unsigned long end)
{
}
 
static inline void flush_tlb_page(struct vm_area_struct *vma,
	unsigned long addr)
{
	/* For one page, it's not worth testing the split_tlb variable */

	mb();
	mtsp(vma->vm_mm->context,1);
	purge_tlb_start();
	pdtlb(addr);
	pitlb(addr);
	purge_tlb_end();
}

static inline void flush_tlb_range(struct vm_area_struct *vma,
	unsigned long start, unsigned long end)
{
	unsigned long npages;

	npages = ((end - (start & PAGE_MASK)) + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
	if (npages >= 512)  /* 2MB of space: arbitrary, should be tuned */
		flush_tlb_all();
	else {
		preempt_disable();
		mtsp(vma->vm_mm->context,1);
		purge_tlb_start();
		if (split_tlb) {
			while (npages--) {
				pdtlb(start);
				pitlb(start);
				start += PAGE_SIZE;
			}
		} else {
			while (npages--) {
				pdtlb(start);
				start += PAGE_SIZE;
			}
		preempt_enable();
		}
		purge_tlb_end();
	}
}

#define flush_tlb_kernel_range(start, end) flush_tlb_all()

#endif
Commit	Line	Data
1da177e4 LT	1	#ifndef _PARISC_TLBFLUSH_H
	2	#define _PARISC_TLBFLUSH_H
	3
	4	/* TLB flushing routines.... */
	5
	6	#include <linux/config.h>
	7	#include <linux/mm.h>
	8	#include <asm/mmu_context.h>
	9
04d472dc GG	10
	11	/* This is for the serialisation of PxTLB broadcasts. At least on the
	12	* N class systems, only one PxTLB inter processor broadcast can be
	13	* active at any one time on the Merced bus. This tlb purge
	14	* synchronisation is fairly lightweight and harmless so we activate
	15	* it on all SMP systems not just the N class. */
	16	#ifdef CONFIG_SMP
	17	extern spinlock_t pa_tlb_lock;
	18
	19	#define purge_tlb_start(x) spin_lock(&pa_tlb_lock)
	20	#define purge_tlb_end(x) spin_unlock(&pa_tlb_lock)
	21
	22	#else
	23
	24	#define purge_tlb_start(x) do { } while(0)
	25	#define purge_tlb_end(x) do { } while (0)
	26
	27	#endif
	28
	29
1da177e4 LT	30	extern void flush_tlb_all(void);
	31
	32	/*
	33	* flush_tlb_mm()
	34	*
	35	* XXX This code is NOT valid for HP-UX compatibility processes,
	36	* (although it will probably work 99% of the time). HP-UX
	37	* processes are free to play with the space id's and save them
	38	* over long periods of time, etc. so we have to preserve the
	39	* space and just flush the entire tlb. We need to check the
	40	* personality in order to do that, but the personality is not
	41	* currently being set correctly.
	42	*
	43	* Of course, Linux processes could do the same thing, but
	44	* we don't support that (and the compilers, dynamic linker,
	45	* etc. do not do that).
	46	*/
	47
	48	static inline void flush_tlb_mm(struct mm_struct *mm)
	49	{
	50	BUG_ON(mm == &init_mm); /* Should never happen */
	51
	52	#ifdef CONFIG_SMP
	53	flush_tlb_all();
	54	#else
	55	if (mm) {
	56	if (mm->context != 0)
	57	free_sid(mm->context);
	58	mm->context = alloc_sid();
	59	if (mm == current->active_mm)
	60	load_context(mm->context);
	61	}
	62	#endif
	63	}
	64
	65	extern __inline__ void flush_tlb_pgtables(struct mm_struct *mm, unsigned long start, unsigned long end)
	66	{
	67	}
	68
	69	static inline void flush_tlb_page(struct vm_area_struct *vma,
	70	unsigned long addr)
	71	{
	72	/* For one page, it's not worth testing the split_tlb variable */
	73
	74	mb();
	75	mtsp(vma->vm_mm->context,1);
	76	purge_tlb_start();
	77	pdtlb(addr);
	78	pitlb(addr);
	79	purge_tlb_end();
	80	}
	81
	82	static inline void flush_tlb_range(struct vm_area_struct *vma,
	83	unsigned long start, unsigned long end)
	84	{
	85	unsigned long npages;
	86
1da177e4	87	npages = ((end - (start & PAGE_MASK)) + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
896a3756	88	if (npages >= 512) /* 2MB of space: arbitrary, should be tuned */
1da177e4 LT	89	flush_tlb_all();
1da177e4 LT	90	else {
663b97f7	91	preempt_disable();
1da177e4	92	mtsp(vma->vm_mm->context,1);
896a3756	93	purge_tlb_start();
1da177e4	94	if (split_tlb) {
1da177e4 LT	95	while (npages--) {
	96	pdtlb(start);
	97	pitlb(start);
	98	start += PAGE_SIZE;
	99	}
1da177e4	100	} else {
1da177e4 LT	101	while (npages--) {
	102	pdtlb(start);
	103	start += PAGE_SIZE;
	104	}
663b97f7	105	preempt_enable();
1da177e4	106	}
896a3756	107	purge_tlb_end();
1da177e4 LT	108	}
	109	}
	110
	111	#define flush_tlb_kernel_range(start, end) flush_tlb_all()
	112
	113	#endif