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Linux/arch/s390/mm/pageattr.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * Copyright IBM Corp. 2011
  4  * Author(s): Jan Glauber <jang@linux.vnet.ibm.com>
  5  */
  6 #include <linux/hugetlb.h>
  7 #include <linux/mm.h>
  8 #include <asm/cacheflush.h>
  9 #include <asm/facility.h>
 10 #include <asm/pgtable.h>
 11 #include <asm/pgalloc.h>
 12 #include <asm/page.h>
 13 #include <asm/set_memory.h>
 14 
 15 static inline unsigned long sske_frame(unsigned long addr, unsigned char skey)
 16 {
 17         asm volatile(".insn rrf,0xb22b0000,%[skey],%[addr],1,0"
 18                      : [addr] "+a" (addr) : [skey] "d" (skey));
 19         return addr;
 20 }
 21 
 22 void __storage_key_init_range(unsigned long start, unsigned long end)
 23 {
 24         unsigned long boundary, size;
 25 
 26         while (start < end) {
 27                 if (MACHINE_HAS_EDAT1) {
 28                         /* set storage keys for a 1MB frame */
 29                         size = 1UL << 20;
 30                         boundary = (start + size) & ~(size - 1);
 31                         if (boundary <= end) {
 32                                 do {
 33                                         start = sske_frame(start, PAGE_DEFAULT_KEY);
 34                                 } while (start < boundary);
 35                                 continue;
 36                         }
 37                 }
 38                 page_set_storage_key(start, PAGE_DEFAULT_KEY, 1);
 39                 start += PAGE_SIZE;
 40         }
 41 }
 42 
 43 #ifdef CONFIG_PROC_FS
 44 atomic_long_t direct_pages_count[PG_DIRECT_MAP_MAX];
 45 
 46 void arch_report_meminfo(struct seq_file *m)
 47 {
 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);
 54 }
 55 #endif /* CONFIG_PROC_FS */
 56 
 57 static void pgt_set(unsigned long *old, unsigned long new, unsigned long addr,
 58                     unsigned long dtt)
 59 {
 60         unsigned long table, mask;
 61 
 62         mask = 0;
 63         if (MACHINE_HAS_EDAT2) {
 64                 switch (dtt) {
 65                 case CRDTE_DTT_REGION3:
 66                         mask = ~(PTRS_PER_PUD * sizeof(pud_t) - 1);
 67                         break;
 68                 case CRDTE_DTT_SEGMENT:
 69                         mask = ~(PTRS_PER_PMD * sizeof(pmd_t) - 1);
 70                         break;
 71                 case CRDTE_DTT_PAGE:
 72                         mask = ~(PTRS_PER_PTE * sizeof(pte_t) - 1);
 73                         break;
 74                 }
 75                 table = (unsigned long)old & mask;
 76                 crdte(*old, new, table, dtt, addr, S390_lowcore.kernel_asce);
 77         } else if (MACHINE_HAS_IDTE) {
 78                 cspg(old, *old, new);
 79         } else {
 80                 csp((unsigned int *)old + 1, *old, new);
 81         }
 82 }
 83 
 84 static int walk_pte_level(pmd_t *pmdp, unsigned long addr, unsigned long end,
 85                           unsigned long flags)
 86 {
 87         pte_t *ptep, new;
 88 
 89         ptep = pte_offset(pmdp, addr);
 90         do {
 91                 new = *ptep;
 92                 if (pte_none(new))
 93                         return -EINVAL;
 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);
103                 ptep++;
104                 addr += PAGE_SIZE;
105                 cond_resched();
106         } while (addr < end);
107         return 0;
108 }
109 
110 static int split_pmd_page(pmd_t *pmdp, unsigned long addr)
111 {
112         unsigned long pte_addr, prot;
113         pte_t *pt_dir, *ptep;
114         pmd_t new;
115         int i, ro, nx;
116 
117         pt_dir = vmem_pte_alloc();
118         if (!pt_dir)
119                 return -ENOMEM;
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);
124         if (!nx)
125                 prot &= ~_PAGE_NOEXEC;
126         ptep = pt_dir;
127         for (i = 0; i < PTRS_PER_PTE; i++) {
128                 pte_val(*ptep) = pte_addr | prot;
129                 pte_addr += PAGE_SIZE;
130                 ptep++;
131         }
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);
136         return 0;
137 }
138 
139 static void modify_pmd_page(pmd_t *pmdp, unsigned long addr,
140                             unsigned long flags)
141 {
142         pmd_t new = *pmdp;
143 
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);
153 }
154 
155 static int walk_pmd_level(pud_t *pudp, unsigned long addr, unsigned long end,
156                           unsigned long flags)
157 {
158         unsigned long next;
159         pmd_t *pmdp;
160         int rc = 0;
161 
162         pmdp = pmd_offset(pudp, addr);
163         do {
164                 if (pmd_none(*pmdp))
165                         return -EINVAL;
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);
170                                 if (rc)
171                                         return rc;
172                                 continue;
173                         }
174                         modify_pmd_page(pmdp, addr, flags);
175                 } else {
176                         rc = walk_pte_level(pmdp, addr, next, flags);
177                         if (rc)
178                                 return rc;
179                 }
180                 pmdp++;
181                 addr = next;
182                 cond_resched();
183         } while (addr < end);
184         return rc;
185 }
186 
187 static int split_pud_page(pud_t *pudp, unsigned long addr)
188 {
189         unsigned long pmd_addr, prot;
190         pmd_t *pm_dir, *pmdp;
191         pud_t new;
192         int i, ro, nx;
193 
194         pm_dir = vmem_crst_alloc(_SEGMENT_ENTRY_EMPTY);
195         if (!pm_dir)
196                 return -ENOMEM;
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);
201         if (!nx)
202                 prot &= ~_SEGMENT_ENTRY_NOEXEC;
203         pmdp = pm_dir;
204         for (i = 0; i < PTRS_PER_PMD; i++) {
205                 pmd_val(*pmdp) = pmd_addr | prot;
206                 pmd_addr += PMD_SIZE;
207                 pmdp++;
208         }
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);
213         return 0;
214 }
215 
216 static void modify_pud_page(pud_t *pudp, unsigned long addr,
217                             unsigned long flags)
218 {
219         pud_t new = *pudp;
220 
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);
230 }
231 
232 static int walk_pud_level(p4d_t *p4d, unsigned long addr, unsigned long end,
233                           unsigned long flags)
234 {
235         unsigned long next;
236         pud_t *pudp;
237         int rc = 0;
238 
239         pudp = pud_offset(p4d, addr);
240         do {
241                 if (pud_none(*pudp))
242                         return -EINVAL;
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);
247                                 if (rc)
248                                         break;
249                                 continue;
250                         }
251                         modify_pud_page(pudp, addr, flags);
252                 } else {
253                         rc = walk_pmd_level(pudp, addr, next, flags);
254                 }
255                 pudp++;
256                 addr = next;
257                 cond_resched();
258         } while (addr < end && !rc);
259         return rc;
260 }
261 
262 static int walk_p4d_level(pgd_t *pgd, unsigned long addr, unsigned long end,
263                           unsigned long flags)
264 {
265         unsigned long next;
266         p4d_t *p4dp;
267         int rc = 0;
268 
269         p4dp = p4d_offset(pgd, addr);
270         do {
271                 if (p4d_none(*p4dp))
272                         return -EINVAL;
273                 next = p4d_addr_end(addr, end);
274                 rc = walk_pud_level(p4dp, addr, next, flags);
275                 p4dp++;
276                 addr = next;
277                 cond_resched();
278         } while (addr < end && !rc);
279         return rc;
280 }
281 
282 static DEFINE_MUTEX(cpa_mutex);
283 
284 static int change_page_attr(unsigned long addr, unsigned long end,
285                             unsigned long flags)
286 {
287         unsigned long next;
288         int rc = -EINVAL;
289         pgd_t *pgdp;
290 
291         if (addr == end)
292                 return 0;
293         if (end >= MODULES_END)
294                 return -EINVAL;
295         mutex_lock(&cpa_mutex);
296         pgdp = pgd_offset_k(addr);
297         do {
298                 if (pgd_none(*pgdp))
299                         break;
300                 next = pgd_addr_end(addr, end);
301                 rc = walk_p4d_level(pgdp, addr, next, flags);
302                 if (rc)
303                         break;
304                 cond_resched();
305         } while (pgdp++, addr = next, addr < end && !rc);
306         mutex_unlock(&cpa_mutex);
307         return rc;
308 }
309 
310 int __set_memory(unsigned long addr, int numpages, unsigned long flags)
311 {
312         if (!MACHINE_HAS_NX)
313                 flags &= ~(SET_MEMORY_NX | SET_MEMORY_X);
314         if (!flags)
315                 return 0;
316         addr &= PAGE_MASK;
317         return change_page_attr(addr, addr + numpages * PAGE_SIZE, flags);
318 }
319 
320 #ifdef CONFIG_DEBUG_PAGEALLOC
321 
322 static void ipte_range(pte_t *pte, unsigned long address, int nr)
323 {
324         int i;
325 
326         if (test_facility(13)) {
327                 __ptep_ipte_range(address, nr - 1, pte, IPTE_GLOBAL);
328                 return;
329         }
330         for (i = 0; i < nr; i++) {
331                 __ptep_ipte(address, pte, 0, 0, IPTE_GLOBAL);
332                 address += PAGE_SIZE;
333                 pte++;
334         }
335 }
336 
337 void __kernel_map_pages(struct page *page, int numpages, int enable)
338 {
339         unsigned long address;
340         int nr, i, j;
341         pgd_t *pgd;
342         p4d_t *p4d;
343         pud_t *pud;
344         pmd_t *pmd;
345         pte_t *pte;
346 
347         for (i = 0; i < numpages;) {
348                 address = page_to_phys(page + i);
349                 pgd = pgd_offset_k(address);
350                 p4d = p4d_offset(pgd, address);
351                 pud = pud_offset(p4d, address);
352                 pmd = pmd_offset(pud, address);
353                 pte = pte_offset_kernel(pmd, address);
354                 nr = (unsigned long)pte >> ilog2(sizeof(long));
355                 nr = PTRS_PER_PTE - (nr & (PTRS_PER_PTE - 1));
356                 nr = min(numpages - i, nr);
357                 if (enable) {
358                         for (j = 0; j < nr; j++) {
359                                 pte_val(*pte) &= ~_PAGE_INVALID;
360                                 address += PAGE_SIZE;
361                                 pte++;
362                         }
363                 } else {
364                         ipte_range(pte, address, nr);
365                 }
366                 i += nr;
367         }
368 }
369 
370 #ifdef CONFIG_HIBERNATION
371 bool kernel_page_present(struct page *page)
372 {
373         unsigned long addr;
374         int cc;
375 
376         addr = page_to_phys(page);
377         asm volatile(
378                 "       lra     %1,0(%1)\n"
379                 "       ipm     %0\n"
380                 "       srl     %0,28"
381                 : "=d" (cc), "+a" (addr) : : "cc");
382         return cc == 0;
383 }
384 #endif /* CONFIG_HIBERNATION */
385 
386 #endif /* CONFIG_DEBUG_PAGEALLOC */
387 

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