[mirror_ubuntu-artful-kernel.git] / include / asm-s390 / tlbflush.h

#ifndef _S390_TLBFLUSH_H
#define _S390_TLBFLUSH_H

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

/*
 * 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_pgtables(mm, start, end) flushes a range of page tables
 */

/*
 * S/390 has three ways of flushing TLBs
 * 'ptlb' does a flush of the local processor
 * 'csp' flushes the TLBs on all PUs of a SMP
 * 'ipte' invalidates a pte in a page table and flushes that out of
 * the TLBs of all PUs of a SMP
 */

#define local_flush_tlb() \
do {  __asm__ __volatile__("ptlb": : :"memory"); } while (0)

#ifndef CONFIG_SMP

/*
 * We always need to flush, since s390 does not flush tlb
 * on each context switch
 */

static inline void flush_tlb(void)
{
	local_flush_tlb();
}
static inline void flush_tlb_all(void)
{
	local_flush_tlb();
}
static inline void flush_tlb_mm(struct mm_struct *mm) 
{
	local_flush_tlb();
}
static inline void flush_tlb_page(struct vm_area_struct *vma,
				  unsigned long addr)
{
	local_flush_tlb();
}
static inline void flush_tlb_range(struct vm_area_struct *vma,
				   unsigned long start, unsigned long end)
{
	local_flush_tlb();
}

#define flush_tlb_kernel_range(start, end) \
	local_flush_tlb();

#else

#include <asm/smp.h>

extern void smp_ptlb_all(void);

static inline void global_flush_tlb(void)
{
#ifndef __s390x__
	if (!MACHINE_HAS_CSP) {
		smp_ptlb_all();
		return;
	}
#endif /* __s390x__ */
	{
		register unsigned long addr asm("4");
		long dummy;

		dummy = 0;
		addr = ((unsigned long) &dummy) + 1;
		__asm__ __volatile__ (
			"    slr  2,2\n"
			"    slr  3,3\n"
			"    csp  2,%0"
			: : "a" (addr), "m" (dummy) : "cc", "2", "3" );
	}
}

/*
 * We only have to do global flush of tlb if process run since last
 * flush on any other pu than current. 
 * If we have threads (mm->count > 1) we always do a global flush, 
 * since the process runs on more than one processor at the same time.
 */

static inline void __flush_tlb_mm(struct mm_struct * mm)
{
	cpumask_t local_cpumask;

	if (unlikely(cpus_empty(mm->cpu_vm_mask)))
		return;
	if (MACHINE_HAS_IDTE) {
		asm volatile (".insn rrf,0xb98e0000,0,%0,%1,0"
			      : : "a" (2048),
			      "a" (__pa(mm->pgd)&PAGE_MASK) : "cc" );
		return;
	}
	preempt_disable();
	local_cpumask = cpumask_of_cpu(smp_processor_id());
	if (cpus_equal(mm->cpu_vm_mask, local_cpumask))
		local_flush_tlb();
	else
		global_flush_tlb();
	preempt_enable();
}

static inline void flush_tlb(void)
{
	__flush_tlb_mm(current->mm);
}
static inline void flush_tlb_all(void)
{
	global_flush_tlb();
}
static inline void flush_tlb_mm(struct mm_struct *mm) 
{
	__flush_tlb_mm(mm); 
}
static inline void flush_tlb_page(struct vm_area_struct *vma,
				  unsigned long addr)
{
	__flush_tlb_mm(vma->vm_mm);
}
static inline void flush_tlb_range(struct vm_area_struct *vma,
				   unsigned long start, unsigned long end)
{
	__flush_tlb_mm(vma->vm_mm); 
}

#define flush_tlb_kernel_range(start, end) global_flush_tlb()

#endif

static inline void flush_tlb_pgtables(struct mm_struct *mm,
                                      unsigned long start, unsigned long end)
{
        /* S/390 does not keep any page table caches in TLB */
}

#endif /* _S390_TLBFLUSH_H */
Commit	Line	Data
1da177e4 LT	1	#ifndef _S390_TLBFLUSH_H
	2	#define _S390_TLBFLUSH_H
	3
	4	#include <linux/config.h>
	5	#include <linux/mm.h>
	6	#include <asm/processor.h>
	7
	8	/*
	9	* TLB flushing:
	10	*
	11	* - flush_tlb() flushes the current mm struct TLBs
	12	* - flush_tlb_all() flushes all processes TLBs
	13	* - flush_tlb_mm(mm) flushes the specified mm context TLB's
	14	* - flush_tlb_page(vma, vmaddr) flushes one page
	15	* - flush_tlb_range(vma, start, end) flushes a range of pages
	16	* - flush_tlb_kernel_range(start, end) flushes a range of kernel pages
	17	* - flush_tlb_pgtables(mm, start, end) flushes a range of page tables
	18	*/
	19
	20	/*
	21	* S/390 has three ways of flushing TLBs
	22	* 'ptlb' does a flush of the local processor
	23	* 'csp' flushes the TLBs on all PUs of a SMP
	24	* 'ipte' invalidates a pte in a page table and flushes that out of
	25	* the TLBs of all PUs of a SMP
	26	*/
	27
	28	#define local_flush_tlb() \
	29	do { __asm__ __volatile__("ptlb": : :"memory"); } while (0)
	30
	31	#ifndef CONFIG_SMP
	32
	33	/*
	34	* We always need to flush, since s390 does not flush tlb
	35	* on each context switch
	36	*/
	37
	38	static inline void flush_tlb(void)
	39	{
	40	local_flush_tlb();
	41	}
	42	static inline void flush_tlb_all(void)
	43	{
	44	local_flush_tlb();
	45	}
	46	static inline void flush_tlb_mm(struct mm_struct *mm)
	47	{
	48	local_flush_tlb();
	49	}
	50	static inline void flush_tlb_page(struct vm_area_struct *vma,
	51	unsigned long addr)
	52	{
	53	local_flush_tlb();
	54	}
	55	static inline void flush_tlb_range(struct vm_area_struct *vma,
	56	unsigned long start, unsigned long end)
	57	{
	58	local_flush_tlb();
	59	}
	60
	61	#define flush_tlb_kernel_range(start, end) \
	62	local_flush_tlb();
	63
	64	#else
65
66	#include <asm/smp.h>
67
68	extern void smp_ptlb_all(void);
69
70	static inline void global_flush_tlb(void)
71	{
72	#ifndef __s390x__
73	if (!MACHINE_HAS_CSP) {
74	smp_ptlb_all();
75	return;
76	}
77	#endif /* __s390x__ */
78	{
79	register unsigned long addr asm("4");
80	long dummy;
81
82	dummy = 0;
83	addr = ((unsigned long) &dummy) + 1;
84	__asm__ __volatile__ (
85	" slr 2,2\n"
86	" slr 3,3\n"
87	" csp 2,%0"
88	: : "a" (addr), "m" (dummy) : "cc", "2", "3" );
89	}
90	}
91
92	/*
93	* We only have to do global flush of tlb if process run since last
94	* flush on any other pu than current.
95	* If we have threads (mm->count > 1) we always do a global flush,
96	* since the process runs on more than one processor at the same time.
97	*/
98
99	static inline void __flush_tlb_mm(struct mm_struct * mm)
100	{
101	cpumask_t local_cpumask;
102
103	if (unlikely(cpus_empty(mm->cpu_vm_mask)))
104	return;
105	if (MACHINE_HAS_IDTE) {
106	asm volatile (".insn rrf,0xb98e0000,0,%0,%1,0"
107	: : "a" (2048),
108	"a" (__pa(mm->pgd)&PAGE_MASK) : "cc" );
109	return;
110	}
111	preempt_disable();
112	local_cpumask = cpumask_of_cpu(smp_processor_id());
113	if (cpus_equal(mm->cpu_vm_mask, local_cpumask))
114	local_flush_tlb();
115	else
116	global_flush_tlb();
117	preempt_enable();
118	}
119
120	static inline void flush_tlb(void)
121	{
122	__flush_tlb_mm(current->mm);
123	}
124	static inline void flush_tlb_all(void)
125	{
126	global_flush_tlb();
127	}
128	static inline void flush_tlb_mm(struct mm_struct *mm)
129	{
130	__flush_tlb_mm(mm);
131	}
132	static inline void flush_tlb_page(struct vm_area_struct *vma,
133	unsigned long addr)
134	{
135	__flush_tlb_mm(vma->vm_mm);
136	}
137	static inline void flush_tlb_range(struct vm_area_struct *vma,
138	unsigned long start, unsigned long end)
139	{
140	__flush_tlb_mm(vma->vm_mm);
141	}
142
143	#define flush_tlb_kernel_range(start, end) global_flush_tlb()
144
145	#endif
146
147	static inline void flush_tlb_pgtables(struct mm_struct *mm,
148	unsigned long start, unsigned long end)
149	{
150	/* S/390 does not keep any page table caches in TLB */
151	}
152
153	#endif /* _S390_TLBFLUSH_H */