[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>

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

	while (start < end) {
		if (MACHINE_HAS_EDAT2) {
			/* set storage keys for a 2GB frame */
			function = 0x22000 | PAGE_DEFAULT_KEY;
			size = 1UL << 31;
			boundary = (start + size) & ~(size - 1);
			if (boundary <= end) {
				do {
					start = pfmf(function, start);
				} while (start < boundary);
				continue;
			}
		}
		if (MACHINE_HAS_EDAT1) {
			/* set storage keys for a 1MB frame */
			function = 0x21000 | PAGE_DEFAULT_KEY;
			size = 1UL << 20;
			boundary = (start + size) & ~(size - 1);
			if (boundary <= end) {
				do {
					start = pfmf(function, start);
				} while (start < boundary);
				continue;
			}
		}
		page_set_storage_key(start, PAGE_DEFAULT_KEY, 0);
		start += PAGE_SIZE;
	}
}

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_TYPE_EMPTY;
			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>
	11
	12	void storage_key_init_range(unsigned long start, unsigned long end)
	13	{
	14	unsigned long boundary, function, size;
	15
	16	while (start < end) {
	17	if (MACHINE_HAS_EDAT2) {
	18	/* set storage keys for a 2GB frame */
	19	function = 0x22000 \| PAGE_DEFAULT_KEY;
	20	size = 1UL << 31;
	21	boundary = (start + size) & ~(size - 1);
	22	if (boundary <= end) {
	23	do {
	24	start = pfmf(function, start);
	25	} while (start < boundary);
	26	continue;
	27	}
	28	}
	29	if (MACHINE_HAS_EDAT1) {
	30	/* set storage keys for a 1MB frame */
	31	function = 0x21000 \| PAGE_DEFAULT_KEY;
	32	size = 1UL << 20;
	33	boundary = (start + size) & ~(size - 1);
	34	if (boundary <= end) {
	35	do {
	36	start = pfmf(function, start);
	37	} while (start < boundary);
	38	continue;
	39	}
	40	}
	41	page_set_storage_key(start, PAGE_DEFAULT_KEY, 0);
	42	start += PAGE_SIZE;
	43	}
	44	}
305b1523	45
5b1ba9e3 HC	46	static pte_t *walk_page_table(unsigned long addr)
	47	{
	48	pgd_t *pgdp;
	49	pud_t *pudp;
	50	pmd_t *pmdp;
	51	pte_t *ptep;
	52
	53	pgdp = pgd_offset_k(addr);
	54	if (pgd_none(*pgdp))
	55	return NULL;
	56	pudp = pud_offset(pgdp, addr);
18da2369	57	if (pud_none(pudp) \|\| pud_large(pudp))
5b1ba9e3 HC	58	return NULL;
	59	pmdp = pmd_offset(pudp, addr);
	60	if (pmd_none(pmdp) \|\| pmd_large(pmdp))
	61	return NULL;
	62	ptep = pte_offset_kernel(pmdp, addr);
	63	if (pte_none(*ptep))
	64	return NULL;
	65	return ptep;
	66	}
	67
305b1523 JG	68	static void change_page_attr(unsigned long addr, int numpages,
	69	pte_t (*set) (pte_t))
	70	{
	71	pte_t *ptep, pte;
305b1523 JG	72	int i;
	73
	74	for (i = 0; i < numpages; i++) {
5b1ba9e3 HC	75	ptep = walk_page_table(addr);
	76	if (WARN_ON_ONCE(!ptep))
	77	break;
305b1523 JG	78	pte = *ptep;
305b1523 JG	79	pte = set(pte);
b2fa47e6	80	__ptep_ipte(addr, ptep);
305b1523	81	*ptep = pte;
e4c031b4	82	addr += PAGE_SIZE;
305b1523 JG	83	}
	84	}
	85
	86	int set_memory_ro(unsigned long addr, int numpages)
	87	{
	88	change_page_attr(addr, numpages, pte_wrprotect);
	89	return 0;
	90	}
305b1523 JG	91
	92	int set_memory_rw(unsigned long addr, int numpages)
	93	{
	94	change_page_attr(addr, numpages, pte_mkwrite);
	95	return 0;
	96	}
305b1523 JG	97
	98	/* not possible */
	99	int set_memory_nx(unsigned long addr, int numpages)
	100	{
	101	return 0;
	102	}
448694a1 JG	103
	104	int set_memory_x(unsigned long addr, int numpages)
	105	{
	106	return 0;
	107	}
0a4ccc99 HC	108
	109	#ifdef CONFIG_DEBUG_PAGEALLOC
	110	void kernel_map_pages(struct page *page, int numpages, int enable)
	111	{
	112	unsigned long address;
	113	pgd_t *pgd;
	114	pud_t *pud;
	115	pmd_t *pmd;
	116	pte_t *pte;
	117	int i;
	118
	119	for (i = 0; i < numpages; i++) {
	120	address = page_to_phys(page + i);
	121	pgd = pgd_offset_k(address);
	122	pud = pud_offset(pgd, address);
	123	pmd = pmd_offset(pud, address);
	124	pte = pte_offset_kernel(pmd, address);
	125	if (!enable) {
	126	__ptep_ipte(address, pte);
	127	pte_val(*pte) = _PAGE_TYPE_EMPTY;
	128	continue;
	129	}
abf09bed	130	pte_val(*pte) = __pa(address);
0a4ccc99 HC	131	}
	132	}
	133
	134	#ifdef CONFIG_HIBERNATION
	135	bool kernel_page_present(struct page *page)
	136	{
	137	unsigned long addr;
	138	int cc;
	139
	140	addr = page_to_phys(page);
	141	asm volatile(
	142	" lra %1,0(%1)\n"
	143	" ipm %0\n"
	144	" srl %0,28"
	145	: "=d" (cc), "+a" (addr) : : "cc");
	146	return cc == 0;
	147	}
	148	#endif /* CONFIG_HIBERNATION */
	149
	150	#endif /* CONFIG_DEBUG_PAGEALLOC */