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>
12 static inline unsigned long sske_frame(unsigned long addr, unsigned char skey)
14 asm volatile(".insn rrf,0xb22b0000,%[skey],%[addr],9,0"
15 : [addr] "+a" (addr) : [skey] "d" (skey));
19 void __storage_key_init_range(unsigned long start, unsigned long end)
21 unsigned long boundary, size;
23 if (!PAGE_DEFAULT_KEY)
26 if (MACHINE_HAS_EDAT1) {
27 /* set storage keys for a 1MB frame */
29 boundary = (start + size) & ~(size - 1);
30 if (boundary <= end) {
32 start = sske_frame(start, PAGE_DEFAULT_KEY);
33 } while (start < boundary);
37 page_set_storage_key(start, PAGE_DEFAULT_KEY, 0);
43 atomic_long_t direct_pages_count[PG_DIRECT_MAP_MAX];
45 void arch_report_meminfo(struct seq_file *m)
47 seq_printf(m, "DirectMap4k: %8lu kB\n",
48 atomic_long_read(&direct_pages_count[PG_DIRECT_MAP_4K]) << 2);
49 seq_printf(m, "DirectMap1M: %8lu kB\n",
50 atomic_long_read(&direct_pages_count[PG_DIRECT_MAP_1M]) << 10);
51 seq_printf(m, "DirectMap2G: %8lu kB\n",
52 atomic_long_read(&direct_pages_count[PG_DIRECT_MAP_2G]) << 21);
54 #endif /* CONFIG_PROC_FS */
56 static void pgt_set(unsigned long *old, unsigned long new, unsigned long addr,
59 unsigned long table, mask;
62 if (MACHINE_HAS_EDAT2) {
64 case CRDTE_DTT_REGION3:
65 mask = ~(PTRS_PER_PUD * sizeof(pud_t) - 1);
67 case CRDTE_DTT_SEGMENT:
68 mask = ~(PTRS_PER_PMD * sizeof(pmd_t) - 1);
71 mask = ~(PTRS_PER_PTE * sizeof(pte_t) - 1);
74 table = (unsigned long)old & mask;
75 crdte(*old, new, table, dtt, addr, S390_lowcore.kernel_asce);
76 } else if (MACHINE_HAS_IDTE) {
79 csp((unsigned int *)old + 1, *old, new);
83 static int walk_pte_level(pmd_t *pmdp, unsigned long addr, unsigned long end,
88 ptep = pte_offset(pmdp, addr);
93 if (flags & SET_MEMORY_RO)
94 new = pte_wrprotect(new);
95 else if (flags & SET_MEMORY_RW)
96 new = pte_mkwrite(pte_mkdirty(new));
97 if ((flags & SET_MEMORY_NX) && MACHINE_HAS_NX)
98 pte_val(new) |= _PAGE_NOEXEC;
99 else if (flags & SET_MEMORY_X)
100 pte_val(new) &= ~_PAGE_NOEXEC;
101 pgt_set((unsigned long *)ptep, pte_val(new), addr, CRDTE_DTT_PAGE);
105 } while (addr < end);
109 static int split_pmd_page(pmd_t *pmdp, unsigned long addr)
111 unsigned long pte_addr, prot;
112 pte_t *pt_dir, *ptep;
116 pt_dir = vmem_pte_alloc();
119 pte_addr = pmd_pfn(*pmdp) << PAGE_SHIFT;
120 ro = !!(pmd_val(*pmdp) & _SEGMENT_ENTRY_PROTECT);
121 nx = !!(pmd_val(*pmdp) & _SEGMENT_ENTRY_NOEXEC);
122 prot = pgprot_val(ro ? PAGE_KERNEL_RO : PAGE_KERNEL);
124 prot &= ~_PAGE_NOEXEC;
126 for (i = 0; i < PTRS_PER_PTE; i++) {
127 pte_val(*ptep) = pte_addr | prot;
128 pte_addr += PAGE_SIZE;
131 pmd_val(new) = __pa(pt_dir) | _SEGMENT_ENTRY;
132 pgt_set((unsigned long *)pmdp, pmd_val(new), addr, CRDTE_DTT_SEGMENT);
133 update_page_count(PG_DIRECT_MAP_4K, PTRS_PER_PTE);
134 update_page_count(PG_DIRECT_MAP_1M, -1);
138 static void modify_pmd_page(pmd_t *pmdp, unsigned long addr,
143 if (flags & SET_MEMORY_RO)
144 new = pmd_wrprotect(new);
145 else if (flags & SET_MEMORY_RW)
146 new = pmd_mkwrite(pmd_mkdirty(new));
147 if ((flags & SET_MEMORY_NX) && MACHINE_HAS_NX)
148 pmd_val(new) |= _SEGMENT_ENTRY_NOEXEC;
149 else if (flags & SET_MEMORY_X)
150 pmd_val(new) &= ~_SEGMENT_ENTRY_NOEXEC;
151 pgt_set((unsigned long *)pmdp, pmd_val(new), addr, CRDTE_DTT_SEGMENT);
154 static int walk_pmd_level(pud_t *pudp, unsigned long addr, unsigned long end,
161 pmdp = pmd_offset(pudp, addr);
165 next = pmd_addr_end(addr, end);
166 if (pmd_large(*pmdp)) {
167 if (addr & ~PMD_MASK || addr + PMD_SIZE > next) {
168 rc = split_pmd_page(pmdp, addr);
173 modify_pmd_page(pmdp, addr, flags);
175 rc = walk_pte_level(pmdp, addr, next, flags);
182 } while (addr < end);
186 static int split_pud_page(pud_t *pudp, unsigned long addr)
188 unsigned long pmd_addr, prot;
189 pmd_t *pm_dir, *pmdp;
193 pm_dir = vmem_pmd_alloc();
196 pmd_addr = pud_pfn(*pudp) << PAGE_SHIFT;
197 ro = !!(pud_val(*pudp) & _REGION_ENTRY_PROTECT);
198 nx = !!(pud_val(*pudp) & _REGION_ENTRY_NOEXEC);
199 prot = pgprot_val(ro ? SEGMENT_KERNEL_RO : SEGMENT_KERNEL);
201 prot &= ~_SEGMENT_ENTRY_NOEXEC;
203 for (i = 0; i < PTRS_PER_PMD; i++) {
204 pmd_val(*pmdp) = pmd_addr | prot;
205 pmd_addr += PMD_SIZE;
208 pud_val(new) = __pa(pm_dir) | _REGION3_ENTRY;
209 pgt_set((unsigned long *)pudp, pud_val(new), addr, CRDTE_DTT_REGION3);
210 update_page_count(PG_DIRECT_MAP_1M, PTRS_PER_PMD);
211 update_page_count(PG_DIRECT_MAP_2G, -1);
215 static void modify_pud_page(pud_t *pudp, unsigned long addr,
220 if (flags & SET_MEMORY_RO)
221 new = pud_wrprotect(new);
222 else if (flags & SET_MEMORY_RW)
223 new = pud_mkwrite(pud_mkdirty(new));
224 if ((flags & SET_MEMORY_NX) && MACHINE_HAS_NX)
225 pud_val(new) |= _REGION_ENTRY_NOEXEC;
226 else if (flags & SET_MEMORY_X)
227 pud_val(new) &= ~_REGION_ENTRY_NOEXEC;
228 pgt_set((unsigned long *)pudp, pud_val(new), addr, CRDTE_DTT_REGION3);
231 static int walk_pud_level(pgd_t *pgd, unsigned long addr, unsigned long end,
238 pudp = pud_offset(pgd, addr);
242 next = pud_addr_end(addr, end);
243 if (pud_large(*pudp)) {
244 if (addr & ~PUD_MASK || addr + PUD_SIZE > next) {
245 rc = split_pud_page(pudp, addr);
250 modify_pud_page(pudp, addr, flags);
252 rc = walk_pmd_level(pudp, addr, next, flags);
257 } while (addr < end && !rc);
261 static DEFINE_MUTEX(cpa_mutex);
263 static int change_page_attr(unsigned long addr, unsigned long end,
272 if (end >= MODULES_END)
274 mutex_lock(&cpa_mutex);
275 pgdp = pgd_offset_k(addr);
279 next = pgd_addr_end(addr, end);
280 rc = walk_pud_level(pgdp, addr, next, flags);
284 } while (pgdp++, addr = next, addr < end && !rc);
285 mutex_unlock(&cpa_mutex);
289 int __set_memory(unsigned long addr, int numpages, unsigned long flags)
292 return change_page_attr(addr, addr + numpages * PAGE_SIZE, flags);
295 #ifdef CONFIG_DEBUG_PAGEALLOC
297 static void ipte_range(pte_t *pte, unsigned long address, int nr)
301 if (test_facility(13)) {
302 __ptep_ipte_range(address, nr - 1, pte, IPTE_GLOBAL);
305 for (i = 0; i < nr; i++) {
306 __ptep_ipte(address, pte, IPTE_GLOBAL);
307 address += PAGE_SIZE;
312 void __kernel_map_pages(struct page *page, int numpages, int enable)
314 unsigned long address;
321 for (i = 0; i < numpages;) {
322 address = page_to_phys(page + i);
323 pgd = pgd_offset_k(address);
324 pud = pud_offset(pgd, address);
325 pmd = pmd_offset(pud, address);
326 pte = pte_offset_kernel(pmd, address);
327 nr = (unsigned long)pte >> ilog2(sizeof(long));
328 nr = PTRS_PER_PTE - (nr & (PTRS_PER_PTE - 1));
329 nr = min(numpages - i, nr);
331 for (j = 0; j < nr; j++) {
332 pte_val(*pte) &= ~_PAGE_INVALID;
333 address += PAGE_SIZE;
337 ipte_range(pte, address, nr);
343 #ifdef CONFIG_HIBERNATION
344 bool kernel_page_present(struct page *page)
349 addr = page_to_phys(page);
354 : "=d" (cc), "+a" (addr) : : "cc");
357 #endif /* CONFIG_HIBERNATION */
359 #endif /* CONFIG_DEBUG_PAGEALLOC */