[mirror_ubuntu-artful-kernel.git] / arch / ia64 / include / asm / tlb.h

#ifndef _ASM_IA64_TLB_H
#define _ASM_IA64_TLB_H
/*
 * Based on <asm-generic/tlb.h>.
 *
 * Copyright (C) 2002-2003 Hewlett-Packard Co
 *	David Mosberger-Tang <davidm@hpl.hp.com>
 */
/*
 * Removing a translation from a page table (including TLB-shootdown) is a four-step
 * procedure:
 *
 *	(1) Flush (virtual) caches --- ensures virtual memory is coherent with kernel memory
 *	    (this is a no-op on ia64).
 *	(2) Clear the relevant portions of the page-table
 *	(3) Flush the TLBs --- ensures that stale content is gone from CPU TLBs
 *	(4) Release the pages that were freed up in step (2).
 *
 * Note that the ordering of these steps is crucial to avoid races on MP machines.
 *
 * The Linux kernel defines several platform-specific hooks for TLB-shootdown.  When
 * unmapping a portion of the virtual address space, these hooks are called according to
 * the following template:
 *
 *	tlb <- tlb_gather_mmu(mm, start, end);		// start unmap for address space MM
 *	{
 *	  for each vma that needs a shootdown do {
 *	    tlb_start_vma(tlb, vma);
 *	      for each page-table-entry PTE that needs to be removed do {
 *		tlb_remove_tlb_entry(tlb, pte, address);
 *		if (pte refers to a normal page) {
 *		  tlb_remove_page(tlb, page);
 *		}
 *	      }
 *	    tlb_end_vma(tlb, vma);
 *	  }
 *	}
 *	tlb_finish_mmu(tlb, start, end);	// finish unmap for address space MM
 */
#include <linux/mm.h>
#include <linux/pagemap.h>
#include <linux/swap.h>

#include <asm/pgalloc.h>
#include <asm/processor.h>
#include <asm/tlbflush.h>
#include <asm/machvec.h>

/*
 * If we can't allocate a page to make a big batch of page pointers
 * to work on, then just handle a few from the on-stack structure.
 */
#define	IA64_GATHER_BUNDLE	8

struct mmu_gather {
	struct mm_struct	*mm;
	unsigned int		nr;
	unsigned int		max;
	unsigned char		fullmm;		/* non-zero means full mm flush */
	unsigned char		need_flush;	/* really unmapped some PTEs? */
	unsigned long		start, end;
	unsigned long		start_addr;
	unsigned long		end_addr;
	struct page		**pages;
	struct page		*local[IA64_GATHER_BUNDLE];
};

struct ia64_tr_entry {
	u64 ifa;
	u64 itir;
	u64 pte;
	u64 rr;
}; /*Record for tr entry!*/

extern int ia64_itr_entry(u64 target_mask, u64 va, u64 pte, u64 log_size);
extern void ia64_ptr_entry(u64 target_mask, int slot);

extern struct ia64_tr_entry *ia64_idtrs[NR_CPUS];

/*
 region register macros
*/
#define RR_TO_VE(val)   (((val) >> 0) & 0x0000000000000001)
#define RR_VE(val)	(((val) & 0x0000000000000001) << 0)
#define RR_VE_MASK	0x0000000000000001L
#define RR_VE_SHIFT	0
#define RR_TO_PS(val)	(((val) >> 2) & 0x000000000000003f)
#define RR_PS(val)	(((val) & 0x000000000000003f) << 2)
#define RR_PS_MASK	0x00000000000000fcL
#define RR_PS_SHIFT	2
#define RR_RID_MASK	0x00000000ffffff00L
#define RR_TO_RID(val) 	((val >> 8) & 0xffffff)

static inline void
ia64_tlb_flush_mmu_tlbonly(struct mmu_gather *tlb, unsigned long start, unsigned long end)
{
	tlb->need_flush = 0;

	if (tlb->fullmm) {
		/*
		 * Tearing down the entire address space.  This happens both as a result
		 * of exit() and execve().  The latter case necessitates the call to
		 * flush_tlb_mm() here.
		 */
		flush_tlb_mm(tlb->mm);
	} else if (unlikely (end - start >= 1024*1024*1024*1024UL
			     || REGION_NUMBER(start) != REGION_NUMBER(end - 1)))
	{
		/*
		 * If we flush more than a tera-byte or across regions, we're probably
		 * better off just flushing the entire TLB(s).  This should be very rare
		 * and is not worth optimizing for.
		 */
		flush_tlb_all();
	} else {
		/*
		 * XXX fix me: flush_tlb_range() should take an mm pointer instead of a
		 * vma pointer.
		 */
		struct vm_area_struct vma;

		vma.vm_mm = tlb->mm;
		/* flush the address range from the tlb: */
		flush_tlb_range(&vma, start, end);
		/* now flush the virt. page-table area mapping the address range: */
		flush_tlb_range(&vma, ia64_thash(start), ia64_thash(end));
	}

}

static inline void
ia64_tlb_flush_mmu_free(struct mmu_gather *tlb)
{
	unsigned long i;
	unsigned int nr;

	/* lastly, release the freed pages */
	nr = tlb->nr;

	tlb->nr = 0;
	tlb->start_addr = ~0UL;
	for (i = 0; i < nr; ++i)
		free_page_and_swap_cache(tlb->pages[i]);
}

/*
 * Flush the TLB for address range START to END and, if not in fast mode, release the
 * freed pages that where gathered up to this point.
 */
static inline void
ia64_tlb_flush_mmu (struct mmu_gather *tlb, unsigned long start, unsigned long end)
{
	if (!tlb->need_flush)
		return;
	ia64_tlb_flush_mmu_tlbonly(tlb, start, end);
	ia64_tlb_flush_mmu_free(tlb);
}

static inline void __tlb_alloc_page(struct mmu_gather *tlb)
{
	unsigned long addr = __get_free_pages(GFP_NOWAIT | __GFP_NOWARN, 0);

	if (addr) {
		tlb->pages = (void *)addr;
		tlb->max = PAGE_SIZE / sizeof(void *);
	}
}


static inline void
arch_tlb_gather_mmu(struct mmu_gather *tlb, struct mm_struct *mm,
			unsigned long start, unsigned long end)
{
	tlb->mm = mm;
	tlb->max = ARRAY_SIZE(tlb->local);
	tlb->pages = tlb->local;
	tlb->nr = 0;
	tlb->fullmm = !(start | (end+1));
	tlb->start = start;
	tlb->end = end;
	tlb->start_addr = ~0UL;
}

/*
 * Called at the end of the shootdown operation to free up any resources that were
 * collected.
 */
static inline void
arch_tlb_finish_mmu(struct mmu_gather *tlb,
			unsigned long start, unsigned long end, bool force)
{
	if (force)
		tlb->need_flush = 1;
	/*
	 * Note: tlb->nr may be 0 at this point, so we can't rely on tlb->start_addr and
	 * tlb->end_addr.
	 */
	ia64_tlb_flush_mmu(tlb, start, end);

	/* keep the page table cache within bounds */
	check_pgt_cache();

	if (tlb->pages != tlb->local)
		free_pages((unsigned long)tlb->pages, 0);
}

/*
 * Logically, this routine frees PAGE.  On MP machines, the actual freeing of the page
 * must be delayed until after the TLB has been flushed (see comments at the beginning of
 * this file).
 */
static inline bool __tlb_remove_page(struct mmu_gather *tlb, struct page *page)
{
	tlb->need_flush = 1;

	if (!tlb->nr && tlb->pages == tlb->local)
		__tlb_alloc_page(tlb);

	tlb->pages[tlb->nr++] = page;
	VM_WARN_ON(tlb->nr > tlb->max);
	if (tlb->nr == tlb->max)
		return true;
	return false;
}

static inline void tlb_flush_mmu_tlbonly(struct mmu_gather *tlb)
{
	ia64_tlb_flush_mmu_tlbonly(tlb, tlb->start_addr, tlb->end_addr);
}

static inline void tlb_flush_mmu_free(struct mmu_gather *tlb)
{
	ia64_tlb_flush_mmu_free(tlb);
}

static inline void tlb_flush_mmu(struct mmu_gather *tlb)
{
	ia64_tlb_flush_mmu(tlb, tlb->start_addr, tlb->end_addr);
}

static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page)
{
	if (__tlb_remove_page(tlb, page))
		tlb_flush_mmu(tlb);
}

static inline bool __tlb_remove_page_size(struct mmu_gather *tlb,
					  struct page *page, int page_size)
{
	return __tlb_remove_page(tlb, page);
}

static inline void tlb_remove_page_size(struct mmu_gather *tlb,
					struct page *page, int page_size)
{
	return tlb_remove_page(tlb, page);
}

/*
 * Remove TLB entry for PTE mapped at virtual address ADDRESS.  This is called for any
 * PTE, not just those pointing to (normal) physical memory.
 */
static inline void
__tlb_remove_tlb_entry (struct mmu_gather *tlb, pte_t *ptep, unsigned long address)
{
	if (tlb->start_addr == ~0UL)
		tlb->start_addr = address;
	tlb->end_addr = address + PAGE_SIZE;
}

#define tlb_migrate_finish(mm)	platform_tlb_migrate_finish(mm)

#define tlb_start_vma(tlb, vma)			do { } while (0)
#define tlb_end_vma(tlb, vma)			do { } while (0)

#define tlb_remove_tlb_entry(tlb, ptep, addr)		\
do {							\
	tlb->need_flush = 1;				\
	__tlb_remove_tlb_entry(tlb, ptep, addr);	\
} while (0)

#define tlb_remove_huge_tlb_entry(h, tlb, ptep, address)	\
	tlb_remove_tlb_entry(tlb, ptep, address)

#define tlb_remove_check_page_size_change tlb_remove_check_page_size_change
static inline void tlb_remove_check_page_size_change(struct mmu_gather *tlb,
						     unsigned int page_size)
{
}

#define pte_free_tlb(tlb, ptep, address)		\
do {							\
	tlb->need_flush = 1;				\
	__pte_free_tlb(tlb, ptep, address);		\
} while (0)

#define pmd_free_tlb(tlb, ptep, address)		\
do {							\
	tlb->need_flush = 1;				\
	__pmd_free_tlb(tlb, ptep, address);		\
} while (0)

#define pud_free_tlb(tlb, pudp, address)		\
do {							\
	tlb->need_flush = 1;				\
	__pud_free_tlb(tlb, pudp, address);		\
} while (0)

#endif /* _ASM_IA64_TLB_H */
Commit	Line	Data
1da177e4 LT	1	#ifndef _ASM_IA64_TLB_H
	2	#define _ASM_IA64_TLB_H
	3	/*
	4	* Based on <asm-generic/tlb.h>.
	5	*
	6	* Copyright (C) 2002-2003 Hewlett-Packard Co
	7	* David Mosberger-Tang <davidm@hpl.hp.com>
	8	*/
	9	/*
	10	* Removing a translation from a page table (including TLB-shootdown) is a four-step
	11	* procedure:
	12	*
	13	* (1) Flush (virtual) caches --- ensures virtual memory is coherent with kernel memory
	14	* (this is a no-op on ia64).
	15	* (2) Clear the relevant portions of the page-table
	16	* (3) Flush the TLBs --- ensures that stale content is gone from CPU TLBs
	17	* (4) Release the pages that were freed up in step (2).
	18	*
	19	* Note that the ordering of these steps is crucial to avoid races on MP machines.
	20	*
	21	* The Linux kernel defines several platform-specific hooks for TLB-shootdown. When
	22	* unmapping a portion of the virtual address space, these hooks are called according to
	23	* the following template:
	24	*
2b047252	25	* tlb <- tlb_gather_mmu(mm, start, end); // start unmap for address space MM
1da177e4 LT	26	* {
	27	* for each vma that needs a shootdown do {
	28	* tlb_start_vma(tlb, vma);
	29	* for each page-table-entry PTE that needs to be removed do {
	30	* tlb_remove_tlb_entry(tlb, pte, address);
	31	* if (pte refers to a normal page) {
	32	* tlb_remove_page(tlb, page);
	33	* }
	34	* }
	35	* tlb_end_vma(tlb, vma);
	36	* }
	37	* }
	38	* tlb_finish_mmu(tlb, start, end); // finish unmap for address space MM
	39	*/
1da177e4 LT	40	#include <linux/mm.h>
	41	#include <linux/pagemap.h>
	42	#include <linux/swap.h>
	43
	44	#include <asm/pgalloc.h>
	45	#include <asm/processor.h>
	46	#include <asm/tlbflush.h>
	47	#include <asm/machvec.h>
	48
7a95a2c8 PZ	49	/*
	50	* If we can't allocate a page to make a big batch of page pointers
	51	* to work on, then just handle a few from the on-stack structure.
	52	*/
	53	#define IA64_GATHER_BUNDLE 8
	54
1da177e4 LT	55	struct mmu_gather {
1da177e4 LT	56	struct mm_struct *mm;
29eb7782	57	unsigned int nr;
7a95a2c8	58	unsigned int max;
1da177e4 LT	59	unsigned char fullmm; /* non-zero means full mm flush */
1da177e4 LT	60	unsigned char need_flush; /* really unmapped some PTEs? */
2b047252	61	unsigned long start, end;
1da177e4 LT	62	unsigned long start_addr;
1da177e4 LT	63	unsigned long end_addr;
7a95a2c8 PZ	64	struct page **pages;
7a95a2c8 PZ	65	struct page *local[IA64_GATHER_BUNDLE];
1da177e4 LT	66	};
1da177e4 LT	67
96651896 XZ	68	struct ia64_tr_entry {
	69	u64 ifa;
	70	u64 itir;
	71	u64 pte;
	72	u64 rr;
	73	}; /Record for tr entry!/
	74
	75	extern int ia64_itr_entry(u64 target_mask, u64 va, u64 pte, u64 log_size);
	76	extern void ia64_ptr_entry(u64 target_mask, int slot);
	77
6c57a332	78	extern struct ia64_tr_entry *ia64_idtrs[NR_CPUS];
96651896 XZ	79
	80	/*
	81	region register macros
	82	*/
	83	#define RR_TO_VE(val) (((val) >> 0) & 0x0000000000000001)
	84	#define RR_VE(val) (((val) & 0x0000000000000001) << 0)
	85	#define RR_VE_MASK 0x0000000000000001L
	86	#define RR_VE_SHIFT 0
	87	#define RR_TO_PS(val) (((val) >> 2) & 0x000000000000003f)
	88	#define RR_PS(val) (((val) & 0x000000000000003f) << 2)
	89	#define RR_PS_MASK 0x00000000000000fcL
	90	#define RR_PS_SHIFT 2
	91	#define RR_RID_MASK 0x00000000ffffff00L
	92	#define RR_TO_RID(val) ((val >> 8) & 0xffffff)
	93
1da177e4	94	static inline void
1cf35d47	95	ia64_tlb_flush_mmu_tlbonly(struct mmu_gather *tlb, unsigned long start, unsigned long end)
1da177e4	96	{
1da177e4 LT	97	tlb->need_flush = 0;
	98
	99	if (tlb->fullmm) {
	100	/*
	101	* Tearing down the entire address space. This happens both as a result
	102	* of exit() and execve(). The latter case necessitates the call to
	103	* flush_tlb_mm() here.
	104	*/
	105	flush_tlb_mm(tlb->mm);
	106	} else if (unlikely (end - start >= 102410241024*1024UL
	107	\|\| REGION_NUMBER(start) != REGION_NUMBER(end - 1)))
	108	{
	109	/*
	110	* If we flush more than a tera-byte or across regions, we're probably
	111	* better off just flushing the entire TLB(s). This should be very rare
	112	* and is not worth optimizing for.
	113	*/
	114	flush_tlb_all();
	115	} else {
	116	/*
	117	* XXX fix me: flush_tlb_range() should take an mm pointer instead of a
	118	* vma pointer.
	119	*/
	120	struct vm_area_struct vma;
	121
	122	vma.vm_mm = tlb->mm;
	123	/* flush the address range from the tlb: */
	124	flush_tlb_range(&vma, start, end);
	125	/* now flush the virt. page-table area mapping the address range: */
	126	flush_tlb_range(&vma, ia64_thash(start), ia64_thash(end));
	127	}
	128
1cf35d47 LT	129	}
	130
	131	static inline void
	132	ia64_tlb_flush_mmu_free(struct mmu_gather *tlb)
	133	{
	134	unsigned long i;
	135	unsigned int nr;
	136
1da177e4 LT	137	/* lastly, release the freed pages */
1da177e4 LT	138	nr = tlb->nr;
29eb7782 PZ	139
	140	tlb->nr = 0;
	141	tlb->start_addr = ~0UL;
	142	for (i = 0; i < nr; ++i)
	143	free_page_and_swap_cache(tlb->pages[i]);
1da177e4 LT	144	}
1da177e4 LT	145
1cf35d47 LT	146	/*
	147	* Flush the TLB for address range START to END and, if not in fast mode, release the
	148	* freed pages that where gathered up to this point.
	149	*/
	150	static inline void
	151	ia64_tlb_flush_mmu (struct mmu_gather *tlb, unsigned long start, unsigned long end)
	152	{
	153	if (!tlb->need_flush)
	154	return;
	155	ia64_tlb_flush_mmu_tlbonly(tlb, start, end);
	156	ia64_tlb_flush_mmu_free(tlb);
	157	}
	158
7a95a2c8	159	static inline void __tlb_alloc_page(struct mmu_gather *tlb)
1da177e4	160	{
7a95a2c8	161	unsigned long addr = __get_free_pages(GFP_NOWAIT \| __GFP_NOWARN, 0);
1da177e4	162
7a95a2c8 PZ	163	if (addr) {
	164	tlb->pages = (void *)addr;
	165	tlb->max = PAGE_SIZE / sizeof(void *);
	166	}
	167	}
	168
	169
	170	static inline void
56236a59 MK	171	arch_tlb_gather_mmu(struct mmu_gather tlb, struct mm_struct mm,
56236a59 MK	172	unsigned long start, unsigned long end)
7a95a2c8	173	{
1da177e4	174	tlb->mm = mm;
7a95a2c8 PZ	175	tlb->max = ARRAY_SIZE(tlb->local);
7a95a2c8 PZ	176	tlb->pages = tlb->local;
29eb7782	177	tlb->nr = 0;
2b047252 LT	178	tlb->fullmm = !(start \| (end+1));
	179	tlb->start = start;
	180	tlb->end = end;
1da177e4	181	tlb->start_addr = ~0UL;
1da177e4 LT	182	}
	183
	184	/*
	185	* Called at the end of the shootdown operation to free up any resources that were
15a23ffa	186	* collected.
1da177e4 LT	187	*/
1da177e4 LT	188	static inline void
56236a59	189	arch_tlb_finish_mmu(struct mmu_gather *tlb,
99baac21	190	unsigned long start, unsigned long end, bool force)
1da177e4	191	{
99baac21 MK	192	if (force)
99baac21 MK	193	tlb->need_flush = 1;
1da177e4 LT	194	/*
	195	* Note: tlb->nr may be 0 at this point, so we can't rely on tlb->start_addr and
	196	* tlb->end_addr.
	197	*/
	198	ia64_tlb_flush_mmu(tlb, start, end);
	199
	200	/* keep the page table cache within bounds */
	201	check_pgt_cache();
15a23ffa	202
7a95a2c8 PZ	203	if (tlb->pages != tlb->local)
7a95a2c8 PZ	204	free_pages((unsigned long)tlb->pages, 0);
1da177e4 LT	205	}
1da177e4 LT	206
1da177e4 LT	207	/*
	208	* Logically, this routine frees PAGE. On MP machines, the actual freeing of the page
	209	* must be delayed until after the TLB has been flushed (see comments at the beginning of
	210	* this file).
	211	*/
e9d55e15	212	static inline bool __tlb_remove_page(struct mmu_gather tlb, struct page page)
1da177e4 LT	213	{
	214	tlb->need_flush = 1;
	215
7a95a2c8 PZ	216	if (!tlb->nr && tlb->pages == tlb->local)
	217	__tlb_alloc_page(tlb);
	218
1da177e4	219	tlb->pages[tlb->nr++] = page;
692a68c1 AK	220	VM_WARN_ON(tlb->nr > tlb->max);
	221	if (tlb->nr == tlb->max)
	222	return true;
e9d55e15	223	return false;
7a95a2c8 PZ	224	}
7a95a2c8 PZ	225
1cf35d47 LT	226	static inline void tlb_flush_mmu_tlbonly(struct mmu_gather *tlb)
	227	{
	228	ia64_tlb_flush_mmu_tlbonly(tlb, tlb->start_addr, tlb->end_addr);
	229	}
	230
	231	static inline void tlb_flush_mmu_free(struct mmu_gather *tlb)
	232	{
	233	ia64_tlb_flush_mmu_free(tlb);
	234	}
	235
7a95a2c8 PZ	236	static inline void tlb_flush_mmu(struct mmu_gather *tlb)
	237	{
	238	ia64_tlb_flush_mmu(tlb, tlb->start_addr, tlb->end_addr);
	239	}
	240
	241	static inline void tlb_remove_page(struct mmu_gather tlb, struct page page)
	242	{
692a68c1	243	if (__tlb_remove_page(tlb, page))
7a95a2c8	244	tlb_flush_mmu(tlb);
e9d55e15 AK	245	}
e9d55e15 AK	246
e77b0852 AK	247	static inline bool __tlb_remove_page_size(struct mmu_gather *tlb,
	248	struct page *page, int page_size)
	249	{
	250	return __tlb_remove_page(tlb, page);
	251	}
	252
e77b0852 AK	253	static inline void tlb_remove_page_size(struct mmu_gather *tlb,
	254	struct page *page, int page_size)
	255	{
	256	return tlb_remove_page(tlb, page);
	257	}
	258
1da177e4 LT	259	/*
	260	* Remove TLB entry for PTE mapped at virtual address ADDRESS. This is called for any
	261	* PTE, not just those pointing to (normal) physical memory.
	262	*/
	263	static inline void
	264	__tlb_remove_tlb_entry (struct mmu_gather tlb, pte_t ptep, unsigned long address)
	265	{
	266	if (tlb->start_addr == ~0UL)
	267	tlb->start_addr = address;
	268	tlb->end_addr = address + PAGE_SIZE;
	269	}
	270
	271	#define tlb_migrate_finish(mm) platform_tlb_migrate_finish(mm)
	272
	273	#define tlb_start_vma(tlb, vma) do { } while (0)
	274	#define tlb_end_vma(tlb, vma) do { } while (0)
	275
	276	#define tlb_remove_tlb_entry(tlb, ptep, addr) \
	277	do { \
	278	tlb->need_flush = 1; \
	279	__tlb_remove_tlb_entry(tlb, ptep, addr); \
	280	} while (0)
	281
b528e4b6 AK	282	#define tlb_remove_huge_tlb_entry(h, tlb, ptep, address) \
	283	tlb_remove_tlb_entry(tlb, ptep, address)
	284
07e32661 AK	285	#define tlb_remove_check_page_size_change tlb_remove_check_page_size_change
	286	static inline void tlb_remove_check_page_size_change(struct mmu_gather *tlb,
	287	unsigned int page_size)
	288	{
	289	}
	290
9e1b32ca	291	#define pte_free_tlb(tlb, ptep, address) \
1da177e4 LT	292	do { \
1da177e4 LT	293	tlb->need_flush = 1; \
9e1b32ca	294	__pte_free_tlb(tlb, ptep, address); \
1da177e4 LT	295	} while (0)
1da177e4 LT	296
9e1b32ca	297	#define pmd_free_tlb(tlb, ptep, address) \
1da177e4 LT	298	do { \
1da177e4 LT	299	tlb->need_flush = 1; \
9e1b32ca	300	__pmd_free_tlb(tlb, ptep, address); \
1da177e4 LT	301	} while (0)
1da177e4 LT	302
9e1b32ca	303	#define pud_free_tlb(tlb, pudp, address) \
1da177e4 LT	304	do { \
1da177e4 LT	305	tlb->need_flush = 1; \
9e1b32ca	306	__pud_free_tlb(tlb, pudp, address); \
1da177e4 LT	307	} while (0)
	308
	309	#endif /* _ASM_IA64_TLB_H */