2 * Copyright IBM Corp. 2011
3 * Author(s): Jan Glauber <jang@linux.vnet.ibm.com>
5 #include <linux/hugetlb.h>
7 #include <asm/cacheflush.h>
8 #include <asm/facility.h>
9 #include <asm/pgtable.h>
11 #include <asm/set_memory.h>
13 static inline unsigned long sske_frame(unsigned long addr, unsigned char skey)
15 asm volatile(".insn rrf,0xb22b0000,%[skey],%[addr],9,0"
16 : [addr] "+a" (addr) : [skey] "d" (skey));
20 void __storage_key_init_range(unsigned long start, unsigned long end)
22 unsigned long boundary, size;
24 if (!PAGE_DEFAULT_KEY)
27 if (MACHINE_HAS_EDAT1) {
28 /* set storage keys for a 1MB frame */
30 boundary = (start + size) & ~(size - 1);
31 if (boundary <= end) {
33 start = sske_frame(start, PAGE_DEFAULT_KEY);
34 } while (start < boundary);
38 page_set_storage_key(start, PAGE_DEFAULT_KEY, 0);
44 atomic_long_t direct_pages_count[PG_DIRECT_MAP_MAX];
46 void arch_report_meminfo(struct seq_file *m)
48 seq_printf(m, "DirectMap4k: %8lu kB\n",
49 atomic_long_read(&direct_pages_count[PG_DIRECT_MAP_4K]) << 2);
50 seq_printf(m, "DirectMap1M: %8lu kB\n",
51 atomic_long_read(&direct_pages_count[PG_DIRECT_MAP_1M]) << 10);
52 seq_printf(m, "DirectMap2G: %8lu kB\n",
53 atomic_long_read(&direct_pages_count[PG_DIRECT_MAP_2G]) << 21);
55 #endif /* CONFIG_PROC_FS */
57 static void pgt_set(unsigned long *old, unsigned long new, unsigned long addr,
60 unsigned long table, mask;
63 if (MACHINE_HAS_EDAT2) {
65 case CRDTE_DTT_REGION3:
66 mask = ~(PTRS_PER_PUD * sizeof(pud_t) - 1);
68 case CRDTE_DTT_SEGMENT:
69 mask = ~(PTRS_PER_PMD * sizeof(pmd_t) - 1);
72 mask = ~(PTRS_PER_PTE * sizeof(pte_t) - 1);
75 table = (unsigned long)old & mask;
76 crdte(*old, new, table, dtt, addr, S390_lowcore.kernel_asce);
77 } else if (MACHINE_HAS_IDTE) {
80 csp((unsigned int *)old + 1, *old, new);
84 static int walk_pte_level(pmd_t *pmdp, unsigned long addr, unsigned long end,
89 ptep = pte_offset(pmdp, addr);
94 if (flags & SET_MEMORY_RO)
95 new = pte_wrprotect(new);
96 else if (flags & SET_MEMORY_RW)
97 new = pte_mkwrite(pte_mkdirty(new));
98 if (flags & SET_MEMORY_NX)
99 pte_val(new) |= _PAGE_NOEXEC;
100 else if (flags & SET_MEMORY_X)
101 pte_val(new) &= ~_PAGE_NOEXEC;
102 pgt_set((unsigned long *)ptep, pte_val(new), addr, CRDTE_DTT_PAGE);
106 } while (addr < end);
110 static int split_pmd_page(pmd_t *pmdp, unsigned long addr)
112 unsigned long pte_addr, prot;
113 pte_t *pt_dir, *ptep;
117 pt_dir = vmem_pte_alloc();
120 pte_addr = pmd_pfn(*pmdp) << PAGE_SHIFT;
121 ro = !!(pmd_val(*pmdp) & _SEGMENT_ENTRY_PROTECT);
122 nx = !!(pmd_val(*pmdp) & _SEGMENT_ENTRY_NOEXEC);
123 prot = pgprot_val(ro ? PAGE_KERNEL_RO : PAGE_KERNEL);
125 prot &= ~_PAGE_NOEXEC;
127 for (i = 0; i < PTRS_PER_PTE; i++) {
128 pte_val(*ptep) = pte_addr | prot;
129 pte_addr += PAGE_SIZE;
132 pmd_val(new) = __pa(pt_dir) | _SEGMENT_ENTRY;
133 pgt_set((unsigned long *)pmdp, pmd_val(new), addr, CRDTE_DTT_SEGMENT);
134 update_page_count(PG_DIRECT_MAP_4K, PTRS_PER_PTE);
135 update_page_count(PG_DIRECT_MAP_1M, -1);
139 static void modify_pmd_page(pmd_t *pmdp, unsigned long addr,
144 if (flags & SET_MEMORY_RO)
145 new = pmd_wrprotect(new);
146 else if (flags & SET_MEMORY_RW)
147 new = pmd_mkwrite(pmd_mkdirty(new));
148 if (flags & SET_MEMORY_NX)
149 pmd_val(new) |= _SEGMENT_ENTRY_NOEXEC;
150 else if (flags & SET_MEMORY_X)
151 pmd_val(new) &= ~_SEGMENT_ENTRY_NOEXEC;
152 pgt_set((unsigned long *)pmdp, pmd_val(new), addr, CRDTE_DTT_SEGMENT);
155 static int walk_pmd_level(pud_t *pudp, unsigned long addr, unsigned long end,
162 pmdp = pmd_offset(pudp, addr);
166 next = pmd_addr_end(addr, end);
167 if (pmd_large(*pmdp)) {
168 if (addr & ~PMD_MASK || addr + PMD_SIZE > next) {
169 rc = split_pmd_page(pmdp, addr);
174 modify_pmd_page(pmdp, addr, flags);
176 rc = walk_pte_level(pmdp, addr, next, flags);
183 } while (addr < end);
187 static int split_pud_page(pud_t *pudp, unsigned long addr)
189 unsigned long pmd_addr, prot;
190 pmd_t *pm_dir, *pmdp;
194 pm_dir = vmem_pmd_alloc();
197 pmd_addr = pud_pfn(*pudp) << PAGE_SHIFT;
198 ro = !!(pud_val(*pudp) & _REGION_ENTRY_PROTECT);
199 nx = !!(pud_val(*pudp) & _REGION_ENTRY_NOEXEC);
200 prot = pgprot_val(ro ? SEGMENT_KERNEL_RO : SEGMENT_KERNEL);
202 prot &= ~_SEGMENT_ENTRY_NOEXEC;
204 for (i = 0; i < PTRS_PER_PMD; i++) {
205 pmd_val(*pmdp) = pmd_addr | prot;
206 pmd_addr += PMD_SIZE;
209 pud_val(new) = __pa(pm_dir) | _REGION3_ENTRY;
210 pgt_set((unsigned long *)pudp, pud_val(new), addr, CRDTE_DTT_REGION3);
211 update_page_count(PG_DIRECT_MAP_1M, PTRS_PER_PMD);
212 update_page_count(PG_DIRECT_MAP_2G, -1);
216 static void modify_pud_page(pud_t *pudp, unsigned long addr,
221 if (flags & SET_MEMORY_RO)
222 new = pud_wrprotect(new);
223 else if (flags & SET_MEMORY_RW)
224 new = pud_mkwrite(pud_mkdirty(new));
225 if (flags & SET_MEMORY_NX)
226 pud_val(new) |= _REGION_ENTRY_NOEXEC;
227 else if (flags & SET_MEMORY_X)
228 pud_val(new) &= ~_REGION_ENTRY_NOEXEC;
229 pgt_set((unsigned long *)pudp, pud_val(new), addr, CRDTE_DTT_REGION3);
232 static int walk_pud_level(pgd_t *pgd, unsigned long addr, unsigned long end,
239 pudp = pud_offset(pgd, addr);
243 next = pud_addr_end(addr, end);
244 if (pud_large(*pudp)) {
245 if (addr & ~PUD_MASK || addr + PUD_SIZE > next) {
246 rc = split_pud_page(pudp, addr);
251 modify_pud_page(pudp, addr, flags);
253 rc = walk_pmd_level(pudp, addr, next, flags);
258 } while (addr < end && !rc);
262 static DEFINE_MUTEX(cpa_mutex);
264 static int change_page_attr(unsigned long addr, unsigned long end,
273 if (end >= MODULES_END)
275 mutex_lock(&cpa_mutex);
276 pgdp = pgd_offset_k(addr);
280 next = pgd_addr_end(addr, end);
281 rc = walk_pud_level(pgdp, addr, next, flags);
285 } while (pgdp++, addr = next, addr < end && !rc);
286 mutex_unlock(&cpa_mutex);
290 int __set_memory(unsigned long addr, int numpages, unsigned long flags)
293 flags &= ~(SET_MEMORY_NX | SET_MEMORY_X);
297 return change_page_attr(addr, addr + numpages * PAGE_SIZE, flags);
300 #ifdef CONFIG_DEBUG_PAGEALLOC
302 static void ipte_range(pte_t *pte, unsigned long address, int nr)
306 if (test_facility(13)) {
307 __ptep_ipte_range(address, nr - 1, pte, IPTE_GLOBAL);
310 for (i = 0; i < nr; i++) {
311 __ptep_ipte(address, pte, IPTE_GLOBAL);
312 address += PAGE_SIZE;
317 void __kernel_map_pages(struct page *page, int numpages, int enable)
319 unsigned long address;
326 for (i = 0; i < numpages;) {
327 address = page_to_phys(page + i);
328 pgd = pgd_offset_k(address);
329 pud = pud_offset(pgd, address);
330 pmd = pmd_offset(pud, address);
331 pte = pte_offset_kernel(pmd, address);
332 nr = (unsigned long)pte >> ilog2(sizeof(long));
333 nr = PTRS_PER_PTE - (nr & (PTRS_PER_PTE - 1));
334 nr = min(numpages - i, nr);
336 for (j = 0; j < nr; j++) {
337 pte_val(*pte) &= ~_PAGE_INVALID;
338 address += PAGE_SIZE;
342 ipte_range(pte, address, nr);
348 #ifdef CONFIG_HIBERNATION
349 bool kernel_page_present(struct page *page)
354 addr = page_to_phys(page);
359 : "=d" (cc), "+a" (addr) : : "cc");
362 #endif /* CONFIG_HIBERNATION */
364 #endif /* CONFIG_DEBUG_PAGEALLOC */