[deliverable/linux.git] / arch / s390 / mm / pageattr.c

/*
 * Copyright IBM Corp. 2011
 * Author(s): Jan Glauber <jang@linux.vnet.ibm.com>
 */
#include <linux/hugetlb.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <asm/cacheflush.h>
#include <asm/pgtable.h>
#include <asm/page.h>

#if PAGE_DEFAULT_KEY
static inline unsigned long sske_frame(unsigned long addr, unsigned char skey)
{
	asm volatile(".insn rrf,0xb22b0000,%[skey],%[addr],9,0"
		     : [addr] "+a" (addr) : [skey] "d" (skey));
	return addr;
}

void __storage_key_init_range(unsigned long start, unsigned long end)
{
	unsigned long boundary, size;

	while (start < end) {
		if (MACHINE_HAS_EDAT1) {
			/* set storage keys for a 1MB frame */
			size = 1UL << 20;
			boundary = (start + size) & ~(size - 1);
			if (boundary <= end) {
				do {
					start = sske_frame(start, PAGE_DEFAULT_KEY);
				} while (start < boundary);
				continue;
			}
		}
		page_set_storage_key(start, PAGE_DEFAULT_KEY, 0);
		start += PAGE_SIZE;
	}
}
#endif

static pte_t *walk_page_table(unsigned long addr)
{
	pgd_t *pgdp;
	pud_t *pudp;
	pmd_t *pmdp;
	pte_t *ptep;

	pgdp = pgd_offset_k(addr);
	if (pgd_none(*pgdp))
		return NULL;
	pudp = pud_offset(pgdp, addr);
	if (pud_none(*pudp) || pud_large(*pudp))
		return NULL;
	pmdp = pmd_offset(pudp, addr);
	if (pmd_none(*pmdp) || pmd_large(*pmdp))
		return NULL;
	ptep = pte_offset_kernel(pmdp, addr);
	if (pte_none(*ptep))
		return NULL;
	return ptep;
}

static void change_page_attr(unsigned long addr, int numpages,
			     pte_t (*set) (pte_t))
{
	pte_t *ptep, pte;
	int i;

	for (i = 0; i < numpages; i++) {
		ptep = walk_page_table(addr);
		if (WARN_ON_ONCE(!ptep))
			break;
		pte = *ptep;
		pte = set(pte);
		__ptep_ipte(addr, ptep);
		*ptep = pte;
		addr += PAGE_SIZE;
	}
}

int set_memory_ro(unsigned long addr, int numpages)
{
	change_page_attr(addr, numpages, pte_wrprotect);
	return 0;
}

int set_memory_rw(unsigned long addr, int numpages)
{
	change_page_attr(addr, numpages, pte_mkwrite);
	return 0;
}

/* not possible */
int set_memory_nx(unsigned long addr, int numpages)
{
	return 0;
}

int set_memory_x(unsigned long addr, int numpages)
{
	return 0;
}

#ifdef CONFIG_DEBUG_PAGEALLOC
void kernel_map_pages(struct page *page, int numpages, int enable)
{
	unsigned long address;
	pgd_t *pgd;
	pud_t *pud;
	pmd_t *pmd;
	pte_t *pte;
	int i;

	for (i = 0; i < numpages; i++) {
		address = page_to_phys(page + i);
		pgd = pgd_offset_k(address);
		pud = pud_offset(pgd, address);
		pmd = pmd_offset(pud, address);
		pte = pte_offset_kernel(pmd, address);
		if (!enable) {
			__ptep_ipte(address, pte);
			pte_val(*pte) = _PAGE_INVALID;
			continue;
		}
		pte_val(*pte) = __pa(address);
	}
}

#ifdef CONFIG_HIBERNATION
bool kernel_page_present(struct page *page)
{
	unsigned long addr;
	int cc;

	addr = page_to_phys(page);
	asm volatile(
		"	lra	%1,0(%1)\n"
		"	ipm	%0\n"
		"	srl	%0,28"
		: "=d" (cc), "+a" (addr) : : "cc");
	return cc == 0;
}
#endif /* CONFIG_HIBERNATION */

#endif /* CONFIG_DEBUG_PAGEALLOC */
Commit	Line	Data
305b1523 JG	1	/*
	2	* Copyright IBM Corp. 2011
	3	* Author(s): Jan Glauber <jang@linux.vnet.ibm.com>
	4	*/
6b70a920	5	#include <linux/hugetlb.h>
305b1523 JG	6	#include <linux/module.h>
305b1523 JG	7	#include <linux/mm.h>
638ad34a	8	#include <asm/cacheflush.h>
305b1523	9	#include <asm/pgtable.h>
6b70a920 HC	10	#include <asm/page.h>
6b70a920 HC	11
127c1fef	12	#if PAGE_DEFAULT_KEY
f7f8d7e5 HC	13	static inline unsigned long sske_frame(unsigned long addr, unsigned char skey)
	14	{
	15	asm volatile(".insn rrf,0xb22b0000,%[skey],%[addr],9,0"
	16	: [addr] "+a" (addr) : [skey] "d" (skey));
	17	return addr;
	18	}
	19
127c1fef	20	void __storage_key_init_range(unsigned long start, unsigned long end)
6b70a920	21	{
f7f8d7e5	22	unsigned long boundary, size;
6b70a920 HC	23
6b70a920 HC	24	while (start < end) {
6b70a920 HC	25	if (MACHINE_HAS_EDAT1) {
6b70a920 HC	26	/* set storage keys for a 1MB frame */
6b70a920 HC	27	size = 1UL << 20;
	28	boundary = (start + size) & ~(size - 1);
	29	if (boundary <= end) {
	30	do {
f7f8d7e5	31	start = sske_frame(start, PAGE_DEFAULT_KEY);
6b70a920 HC	32	} while (start < boundary);
	33	continue;
	34	}
	35	}
	36	page_set_storage_key(start, PAGE_DEFAULT_KEY, 0);
	37	start += PAGE_SIZE;
	38	}
	39	}
127c1fef	40	#endif
305b1523	41
5b1ba9e3 HC	42	static pte_t *walk_page_table(unsigned long addr)
	43	{
	44	pgd_t *pgdp;
	45	pud_t *pudp;
	46	pmd_t *pmdp;
	47	pte_t *ptep;
	48
	49	pgdp = pgd_offset_k(addr);
	50	if (pgd_none(*pgdp))
	51	return NULL;
	52	pudp = pud_offset(pgdp, addr);
18da2369	53	if (pud_none(pudp) \|\| pud_large(pudp))
5b1ba9e3 HC	54	return NULL;
	55	pmdp = pmd_offset(pudp, addr);
	56	if (pmd_none(pmdp) \|\| pmd_large(pmdp))
	57	return NULL;
	58	ptep = pte_offset_kernel(pmdp, addr);
	59	if (pte_none(*ptep))
	60	return NULL;
	61	return ptep;
	62	}
	63
305b1523 JG	64	static void change_page_attr(unsigned long addr, int numpages,
	65	pte_t (*set) (pte_t))
	66	{
	67	pte_t *ptep, pte;
305b1523 JG	68	int i;
	69
	70	for (i = 0; i < numpages; i++) {
5b1ba9e3 HC	71	ptep = walk_page_table(addr);
	72	if (WARN_ON_ONCE(!ptep))
	73	break;
305b1523 JG	74	pte = *ptep;
305b1523 JG	75	pte = set(pte);
b2fa47e6	76	__ptep_ipte(addr, ptep);
305b1523	77	*ptep = pte;
e4c031b4	78	addr += PAGE_SIZE;
305b1523 JG	79	}
	80	}
	81
	82	int set_memory_ro(unsigned long addr, int numpages)
	83	{
	84	change_page_attr(addr, numpages, pte_wrprotect);
	85	return 0;
	86	}
305b1523 JG	87
	88	int set_memory_rw(unsigned long addr, int numpages)
	89	{
	90	change_page_attr(addr, numpages, pte_mkwrite);
	91	return 0;
	92	}
305b1523 JG	93
	94	/* not possible */
	95	int set_memory_nx(unsigned long addr, int numpages)
	96	{
	97	return 0;
	98	}
448694a1 JG	99
	100	int set_memory_x(unsigned long addr, int numpages)
	101	{
	102	return 0;
	103	}
0a4ccc99 HC	104
	105	#ifdef CONFIG_DEBUG_PAGEALLOC
	106	void kernel_map_pages(struct page *page, int numpages, int enable)
	107	{
	108	unsigned long address;
	109	pgd_t *pgd;
	110	pud_t *pud;
	111	pmd_t *pmd;
	112	pte_t *pte;
	113	int i;
	114
	115	for (i = 0; i < numpages; i++) {
	116	address = page_to_phys(page + i);
	117	pgd = pgd_offset_k(address);
	118	pud = pud_offset(pgd, address);
	119	pmd = pmd_offset(pud, address);
	120	pte = pte_offset_kernel(pmd, address);
	121	if (!enable) {
	122	__ptep_ipte(address, pte);
e5098611	123	pte_val(*pte) = _PAGE_INVALID;
0a4ccc99 HC	124	continue;
0a4ccc99 HC	125	}
abf09bed	126	pte_val(*pte) = __pa(address);
0a4ccc99 HC	127	}
	128	}
	129
	130	#ifdef CONFIG_HIBERNATION
	131	bool kernel_page_present(struct page *page)
	132	{
	133	unsigned long addr;
	134	int cc;
	135
	136	addr = page_to_phys(page);
	137	asm volatile(
	138	" lra %1,0(%1)\n"
	139	" ipm %0\n"
	140	" srl %0,28"
	141	: "=d" (cc), "+a" (addr) : : "cc");
	142	return cc == 0;
	143	}
	144	#endif /* CONFIG_HIBERNATION */
	145
	146	#endif /* CONFIG_DEBUG_PAGEALLOC */