Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * PowerPC64 port by Mike Corrigan and Dave Engebretsen | |
3 | * {mikejc|engebret}@us.ibm.com | |
4 | * | |
5 | * Copyright (c) 2000 Mike Corrigan <mikejc@us.ibm.com> | |
6 | * | |
7 | * SMP scalability work: | |
8 | * Copyright (C) 2001 Anton Blanchard <anton@au.ibm.com>, IBM | |
9 | * | |
10 | * Module name: htab.c | |
11 | * | |
12 | * Description: | |
13 | * PowerPC Hashed Page Table functions | |
14 | * | |
15 | * This program is free software; you can redistribute it and/or | |
16 | * modify it under the terms of the GNU General Public License | |
17 | * as published by the Free Software Foundation; either version | |
18 | * 2 of the License, or (at your option) any later version. | |
19 | */ | |
20 | ||
21 | #undef DEBUG | |
3c726f8d | 22 | #undef DEBUG_LOW |
1da177e4 | 23 | |
1da177e4 LT |
24 | #include <linux/spinlock.h> |
25 | #include <linux/errno.h> | |
26 | #include <linux/sched.h> | |
27 | #include <linux/proc_fs.h> | |
28 | #include <linux/stat.h> | |
29 | #include <linux/sysctl.h> | |
66b15db6 | 30 | #include <linux/export.h> |
1da177e4 LT |
31 | #include <linux/ctype.h> |
32 | #include <linux/cache.h> | |
33 | #include <linux/init.h> | |
34 | #include <linux/signal.h> | |
95f72d1e | 35 | #include <linux/memblock.h> |
1da177e4 | 36 | |
1da177e4 LT |
37 | #include <asm/processor.h> |
38 | #include <asm/pgtable.h> | |
39 | #include <asm/mmu.h> | |
40 | #include <asm/mmu_context.h> | |
41 | #include <asm/page.h> | |
42 | #include <asm/types.h> | |
1da177e4 LT |
43 | #include <asm/uaccess.h> |
44 | #include <asm/machdep.h> | |
d9b2b2a2 | 45 | #include <asm/prom.h> |
1da177e4 LT |
46 | #include <asm/tlbflush.h> |
47 | #include <asm/io.h> | |
48 | #include <asm/eeh.h> | |
49 | #include <asm/tlb.h> | |
50 | #include <asm/cacheflush.h> | |
51 | #include <asm/cputable.h> | |
1da177e4 | 52 | #include <asm/sections.h> |
d0f13e3c | 53 | #include <asm/spu.h> |
aa39be09 | 54 | #include <asm/udbg.h> |
b68a70c4 | 55 | #include <asm/code-patching.h> |
3ccc00a7 | 56 | #include <asm/fadump.h> |
f5339277 | 57 | #include <asm/firmware.h> |
bc2a9408 | 58 | #include <asm/tm.h> |
1da177e4 LT |
59 | |
60 | #ifdef DEBUG | |
61 | #define DBG(fmt...) udbg_printf(fmt) | |
62 | #else | |
63 | #define DBG(fmt...) | |
64 | #endif | |
65 | ||
3c726f8d BH |
66 | #ifdef DEBUG_LOW |
67 | #define DBG_LOW(fmt...) udbg_printf(fmt) | |
68 | #else | |
69 | #define DBG_LOW(fmt...) | |
70 | #endif | |
71 | ||
72 | #define KB (1024) | |
73 | #define MB (1024*KB) | |
658013e9 | 74 | #define GB (1024L*MB) |
3c726f8d | 75 | |
1da177e4 LT |
76 | /* |
77 | * Note: pte --> Linux PTE | |
78 | * HPTE --> PowerPC Hashed Page Table Entry | |
79 | * | |
80 | * Execution context: | |
81 | * htab_initialize is called with the MMU off (of course), but | |
82 | * the kernel has been copied down to zero so it can directly | |
83 | * reference global data. At this point it is very difficult | |
84 | * to print debug info. | |
85 | * | |
86 | */ | |
87 | ||
88 | #ifdef CONFIG_U3_DART | |
89 | extern unsigned long dart_tablebase; | |
90 | #endif /* CONFIG_U3_DART */ | |
91 | ||
799d6046 PM |
92 | static unsigned long _SDR1; |
93 | struct mmu_psize_def mmu_psize_defs[MMU_PAGE_COUNT]; | |
94 | ||
8e561e7e | 95 | struct hash_pte *htab_address; |
337a7128 | 96 | unsigned long htab_size_bytes; |
96e28449 | 97 | unsigned long htab_hash_mask; |
4ab79aa8 | 98 | EXPORT_SYMBOL_GPL(htab_hash_mask); |
3c726f8d BH |
99 | int mmu_linear_psize = MMU_PAGE_4K; |
100 | int mmu_virtual_psize = MMU_PAGE_4K; | |
bf72aeba | 101 | int mmu_vmalloc_psize = MMU_PAGE_4K; |
cec08e7a BH |
102 | #ifdef CONFIG_SPARSEMEM_VMEMMAP |
103 | int mmu_vmemmap_psize = MMU_PAGE_4K; | |
104 | #endif | |
bf72aeba | 105 | int mmu_io_psize = MMU_PAGE_4K; |
1189be65 PM |
106 | int mmu_kernel_ssize = MMU_SEGSIZE_256M; |
107 | int mmu_highuser_ssize = MMU_SEGSIZE_256M; | |
584f8b71 | 108 | u16 mmu_slb_size = 64; |
4ab79aa8 | 109 | EXPORT_SYMBOL_GPL(mmu_slb_size); |
bf72aeba PM |
110 | #ifdef CONFIG_PPC_64K_PAGES |
111 | int mmu_ci_restrictions; | |
112 | #endif | |
370a908d BH |
113 | #ifdef CONFIG_DEBUG_PAGEALLOC |
114 | static u8 *linear_map_hash_slots; | |
115 | static unsigned long linear_map_hash_count; | |
ed166692 | 116 | static DEFINE_SPINLOCK(linear_map_hash_lock); |
370a908d | 117 | #endif /* CONFIG_DEBUG_PAGEALLOC */ |
1da177e4 | 118 | |
3c726f8d BH |
119 | /* There are definitions of page sizes arrays to be used when none |
120 | * is provided by the firmware. | |
121 | */ | |
1da177e4 | 122 | |
3c726f8d BH |
123 | /* Pre-POWER4 CPUs (4k pages only) |
124 | */ | |
09de9ff8 | 125 | static struct mmu_psize_def mmu_psize_defaults_old[] = { |
3c726f8d BH |
126 | [MMU_PAGE_4K] = { |
127 | .shift = 12, | |
128 | .sllp = 0, | |
b1022fbd | 129 | .penc = {[MMU_PAGE_4K] = 0, [1 ... MMU_PAGE_COUNT - 1] = -1}, |
3c726f8d BH |
130 | .avpnm = 0, |
131 | .tlbiel = 0, | |
132 | }, | |
133 | }; | |
134 | ||
135 | /* POWER4, GPUL, POWER5 | |
136 | * | |
137 | * Support for 16Mb large pages | |
138 | */ | |
09de9ff8 | 139 | static struct mmu_psize_def mmu_psize_defaults_gp[] = { |
3c726f8d BH |
140 | [MMU_PAGE_4K] = { |
141 | .shift = 12, | |
142 | .sllp = 0, | |
b1022fbd | 143 | .penc = {[MMU_PAGE_4K] = 0, [1 ... MMU_PAGE_COUNT - 1] = -1}, |
3c726f8d BH |
144 | .avpnm = 0, |
145 | .tlbiel = 1, | |
146 | }, | |
147 | [MMU_PAGE_16M] = { | |
148 | .shift = 24, | |
149 | .sllp = SLB_VSID_L, | |
b1022fbd AK |
150 | .penc = {[0 ... MMU_PAGE_16M - 1] = -1, [MMU_PAGE_16M] = 0, |
151 | [MMU_PAGE_16M + 1 ... MMU_PAGE_COUNT - 1] = -1 }, | |
3c726f8d BH |
152 | .avpnm = 0x1UL, |
153 | .tlbiel = 0, | |
154 | }, | |
155 | }; | |
156 | ||
bc033b63 BH |
157 | static unsigned long htab_convert_pte_flags(unsigned long pteflags) |
158 | { | |
159 | unsigned long rflags = pteflags & 0x1fa; | |
160 | ||
161 | /* _PAGE_EXEC -> NOEXEC */ | |
162 | if ((pteflags & _PAGE_EXEC) == 0) | |
163 | rflags |= HPTE_R_N; | |
164 | ||
165 | /* PP bits. PAGE_USER is already PP bit 0x2, so we only | |
166 | * need to add in 0x1 if it's a read-only user page | |
167 | */ | |
168 | if ((pteflags & _PAGE_USER) && !((pteflags & _PAGE_RW) && | |
169 | (pteflags & _PAGE_DIRTY))) | |
170 | rflags |= 1; | |
171 | ||
172 | /* Always add C */ | |
173 | return rflags | HPTE_R_C; | |
174 | } | |
3c726f8d BH |
175 | |
176 | int htab_bolt_mapping(unsigned long vstart, unsigned long vend, | |
bc033b63 | 177 | unsigned long pstart, unsigned long prot, |
1189be65 | 178 | int psize, int ssize) |
1da177e4 | 179 | { |
3c726f8d BH |
180 | unsigned long vaddr, paddr; |
181 | unsigned int step, shift; | |
3c726f8d | 182 | int ret = 0; |
1da177e4 | 183 | |
3c726f8d BH |
184 | shift = mmu_psize_defs[psize].shift; |
185 | step = 1 << shift; | |
1da177e4 | 186 | |
bc033b63 BH |
187 | prot = htab_convert_pte_flags(prot); |
188 | ||
189 | DBG("htab_bolt_mapping(%lx..%lx -> %lx (%lx,%d,%d)\n", | |
190 | vstart, vend, pstart, prot, psize, ssize); | |
191 | ||
3c726f8d BH |
192 | for (vaddr = vstart, paddr = pstart; vaddr < vend; |
193 | vaddr += step, paddr += step) { | |
370a908d | 194 | unsigned long hash, hpteg; |
1189be65 | 195 | unsigned long vsid = get_kernel_vsid(vaddr, ssize); |
5524a27d | 196 | unsigned long vpn = hpt_vpn(vaddr, vsid, ssize); |
9e88ba4e PM |
197 | unsigned long tprot = prot; |
198 | ||
c60ac569 AK |
199 | /* |
200 | * If we hit a bad address return error. | |
201 | */ | |
202 | if (!vsid) | |
203 | return -1; | |
9e88ba4e | 204 | /* Make kernel text executable */ |
549e8152 | 205 | if (overlaps_kernel_text(vaddr, vaddr + step)) |
9e88ba4e | 206 | tprot &= ~HPTE_R_N; |
1da177e4 | 207 | |
5524a27d | 208 | hash = hpt_hash(vpn, shift, ssize); |
1da177e4 LT |
209 | hpteg = ((hash & htab_hash_mask) * HPTES_PER_GROUP); |
210 | ||
c30a4df3 | 211 | BUG_ON(!ppc_md.hpte_insert); |
5524a27d | 212 | ret = ppc_md.hpte_insert(hpteg, vpn, paddr, tprot, |
b1022fbd | 213 | HPTE_V_BOLTED, psize, psize, ssize); |
c30a4df3 | 214 | |
3c726f8d BH |
215 | if (ret < 0) |
216 | break; | |
370a908d BH |
217 | #ifdef CONFIG_DEBUG_PAGEALLOC |
218 | if ((paddr >> PAGE_SHIFT) < linear_map_hash_count) | |
219 | linear_map_hash_slots[paddr >> PAGE_SHIFT] = ret | 0x80; | |
220 | #endif /* CONFIG_DEBUG_PAGEALLOC */ | |
3c726f8d BH |
221 | } |
222 | return ret < 0 ? ret : 0; | |
223 | } | |
1da177e4 | 224 | |
ae86f008 | 225 | #ifdef CONFIG_MEMORY_HOTPLUG |
52db9b44 | 226 | static int htab_remove_mapping(unsigned long vstart, unsigned long vend, |
f8c8803b BP |
227 | int psize, int ssize) |
228 | { | |
229 | unsigned long vaddr; | |
230 | unsigned int step, shift; | |
231 | ||
232 | shift = mmu_psize_defs[psize].shift; | |
233 | step = 1 << shift; | |
234 | ||
235 | if (!ppc_md.hpte_removebolted) { | |
52db9b44 BP |
236 | printk(KERN_WARNING "Platform doesn't implement " |
237 | "hpte_removebolted\n"); | |
238 | return -EINVAL; | |
f8c8803b BP |
239 | } |
240 | ||
241 | for (vaddr = vstart; vaddr < vend; vaddr += step) | |
242 | ppc_md.hpte_removebolted(vaddr, psize, ssize); | |
52db9b44 BP |
243 | |
244 | return 0; | |
f8c8803b | 245 | } |
ae86f008 | 246 | #endif /* CONFIG_MEMORY_HOTPLUG */ |
f8c8803b | 247 | |
1189be65 PM |
248 | static int __init htab_dt_scan_seg_sizes(unsigned long node, |
249 | const char *uname, int depth, | |
250 | void *data) | |
251 | { | |
252 | char *type = of_get_flat_dt_prop(node, "device_type", NULL); | |
253 | u32 *prop; | |
254 | unsigned long size = 0; | |
255 | ||
256 | /* We are scanning "cpu" nodes only */ | |
257 | if (type == NULL || strcmp(type, "cpu") != 0) | |
258 | return 0; | |
259 | ||
260 | prop = (u32 *)of_get_flat_dt_prop(node, "ibm,processor-segment-sizes", | |
261 | &size); | |
262 | if (prop == NULL) | |
263 | return 0; | |
264 | for (; size >= 4; size -= 4, ++prop) { | |
265 | if (prop[0] == 40) { | |
266 | DBG("1T segment support detected\n"); | |
44ae3ab3 | 267 | cur_cpu_spec->mmu_features |= MMU_FTR_1T_SEGMENT; |
f5534004 | 268 | return 1; |
1189be65 | 269 | } |
1189be65 | 270 | } |
44ae3ab3 | 271 | cur_cpu_spec->mmu_features &= ~MMU_FTR_NO_SLBIE_B; |
1189be65 PM |
272 | return 0; |
273 | } | |
274 | ||
275 | static void __init htab_init_seg_sizes(void) | |
276 | { | |
277 | of_scan_flat_dt(htab_dt_scan_seg_sizes, NULL); | |
278 | } | |
279 | ||
b1022fbd AK |
280 | static int __init get_idx_from_shift(unsigned int shift) |
281 | { | |
282 | int idx = -1; | |
283 | ||
284 | switch (shift) { | |
285 | case 0xc: | |
286 | idx = MMU_PAGE_4K; | |
287 | break; | |
288 | case 0x10: | |
289 | idx = MMU_PAGE_64K; | |
290 | break; | |
291 | case 0x14: | |
292 | idx = MMU_PAGE_1M; | |
293 | break; | |
294 | case 0x18: | |
295 | idx = MMU_PAGE_16M; | |
296 | break; | |
297 | case 0x22: | |
298 | idx = MMU_PAGE_16G; | |
299 | break; | |
300 | } | |
301 | return idx; | |
302 | } | |
303 | ||
3c726f8d BH |
304 | static int __init htab_dt_scan_page_sizes(unsigned long node, |
305 | const char *uname, int depth, | |
306 | void *data) | |
307 | { | |
308 | char *type = of_get_flat_dt_prop(node, "device_type", NULL); | |
309 | u32 *prop; | |
310 | unsigned long size = 0; | |
311 | ||
312 | /* We are scanning "cpu" nodes only */ | |
313 | if (type == NULL || strcmp(type, "cpu") != 0) | |
314 | return 0; | |
315 | ||
316 | prop = (u32 *)of_get_flat_dt_prop(node, | |
317 | "ibm,segment-page-sizes", &size); | |
318 | if (prop != NULL) { | |
3dc4feca | 319 | pr_info("Page sizes from device-tree:\n"); |
3c726f8d | 320 | size /= 4; |
44ae3ab3 | 321 | cur_cpu_spec->mmu_features &= ~(MMU_FTR_16M_PAGE); |
3c726f8d | 322 | while(size > 0) { |
b1022fbd | 323 | unsigned int base_shift = prop[0]; |
3c726f8d BH |
324 | unsigned int slbenc = prop[1]; |
325 | unsigned int lpnum = prop[2]; | |
3c726f8d | 326 | struct mmu_psize_def *def; |
b1022fbd | 327 | int idx, base_idx; |
3c726f8d BH |
328 | |
329 | size -= 3; prop += 3; | |
b1022fbd AK |
330 | base_idx = get_idx_from_shift(base_shift); |
331 | if (base_idx < 0) { | |
332 | /* | |
333 | * skip the pte encoding also | |
334 | */ | |
335 | prop += lpnum * 2; size -= lpnum * 2; | |
336 | continue; | |
3c726f8d | 337 | } |
b1022fbd AK |
338 | def = &mmu_psize_defs[base_idx]; |
339 | if (base_idx == MMU_PAGE_16M) | |
44ae3ab3 | 340 | cur_cpu_spec->mmu_features |= MMU_FTR_16M_PAGE; |
b1022fbd AK |
341 | |
342 | def->shift = base_shift; | |
343 | if (base_shift <= 23) | |
3c726f8d BH |
344 | def->avpnm = 0; |
345 | else | |
b1022fbd | 346 | def->avpnm = (1 << (base_shift - 23)) - 1; |
3c726f8d | 347 | def->sllp = slbenc; |
b1022fbd AK |
348 | /* |
349 | * We don't know for sure what's up with tlbiel, so | |
3c726f8d BH |
350 | * for now we only set it for 4K and 64K pages |
351 | */ | |
b1022fbd | 352 | if (base_idx == MMU_PAGE_4K || base_idx == MMU_PAGE_64K) |
3c726f8d BH |
353 | def->tlbiel = 1; |
354 | else | |
355 | def->tlbiel = 0; | |
356 | ||
b1022fbd AK |
357 | while (size > 0 && lpnum) { |
358 | unsigned int shift = prop[0]; | |
359 | int penc = prop[1]; | |
360 | ||
361 | prop += 2; size -= 2; | |
362 | lpnum--; | |
363 | ||
364 | idx = get_idx_from_shift(shift); | |
365 | if (idx < 0) | |
366 | continue; | |
367 | ||
368 | if (penc == -1) | |
369 | pr_err("Invalid penc for base_shift=%d " | |
370 | "shift=%d\n", base_shift, shift); | |
371 | ||
372 | def->penc[idx] = penc; | |
3dc4feca AK |
373 | pr_info("base_shift=%d: shift=%d, sllp=0x%04lx," |
374 | " avpnm=0x%08lx, tlbiel=%d, penc=%d\n", | |
375 | base_shift, shift, def->sllp, | |
376 | def->avpnm, def->tlbiel, def->penc[idx]); | |
b1022fbd | 377 | } |
1da177e4 | 378 | } |
3c726f8d BH |
379 | return 1; |
380 | } | |
381 | return 0; | |
382 | } | |
383 | ||
e16a9c09 | 384 | #ifdef CONFIG_HUGETLB_PAGE |
658013e9 JT |
385 | /* Scan for 16G memory blocks that have been set aside for huge pages |
386 | * and reserve those blocks for 16G huge pages. | |
387 | */ | |
388 | static int __init htab_dt_scan_hugepage_blocks(unsigned long node, | |
389 | const char *uname, int depth, | |
390 | void *data) { | |
391 | char *type = of_get_flat_dt_prop(node, "device_type", NULL); | |
392 | unsigned long *addr_prop; | |
393 | u32 *page_count_prop; | |
394 | unsigned int expected_pages; | |
395 | long unsigned int phys_addr; | |
396 | long unsigned int block_size; | |
397 | ||
398 | /* We are scanning "memory" nodes only */ | |
399 | if (type == NULL || strcmp(type, "memory") != 0) | |
400 | return 0; | |
401 | ||
402 | /* This property is the log base 2 of the number of virtual pages that | |
403 | * will represent this memory block. */ | |
404 | page_count_prop = of_get_flat_dt_prop(node, "ibm,expected#pages", NULL); | |
405 | if (page_count_prop == NULL) | |
406 | return 0; | |
407 | expected_pages = (1 << page_count_prop[0]); | |
408 | addr_prop = of_get_flat_dt_prop(node, "reg", NULL); | |
409 | if (addr_prop == NULL) | |
410 | return 0; | |
411 | phys_addr = addr_prop[0]; | |
412 | block_size = addr_prop[1]; | |
413 | if (block_size != (16 * GB)) | |
414 | return 0; | |
415 | printk(KERN_INFO "Huge page(16GB) memory: " | |
416 | "addr = 0x%lX size = 0x%lX pages = %d\n", | |
417 | phys_addr, block_size, expected_pages); | |
95f72d1e YL |
418 | if (phys_addr + (16 * GB) <= memblock_end_of_DRAM()) { |
419 | memblock_reserve(phys_addr, block_size * expected_pages); | |
4792adba JT |
420 | add_gpage(phys_addr, block_size, expected_pages); |
421 | } | |
658013e9 JT |
422 | return 0; |
423 | } | |
e16a9c09 | 424 | #endif /* CONFIG_HUGETLB_PAGE */ |
658013e9 | 425 | |
b1022fbd AK |
426 | static void mmu_psize_set_default_penc(void) |
427 | { | |
428 | int bpsize, apsize; | |
429 | for (bpsize = 0; bpsize < MMU_PAGE_COUNT; bpsize++) | |
430 | for (apsize = 0; apsize < MMU_PAGE_COUNT; apsize++) | |
431 | mmu_psize_defs[bpsize].penc[apsize] = -1; | |
432 | } | |
433 | ||
3c726f8d BH |
434 | static void __init htab_init_page_sizes(void) |
435 | { | |
436 | int rc; | |
437 | ||
b1022fbd AK |
438 | /* se the invalid penc to -1 */ |
439 | mmu_psize_set_default_penc(); | |
440 | ||
3c726f8d BH |
441 | /* Default to 4K pages only */ |
442 | memcpy(mmu_psize_defs, mmu_psize_defaults_old, | |
443 | sizeof(mmu_psize_defaults_old)); | |
444 | ||
445 | /* | |
446 | * Try to find the available page sizes in the device-tree | |
447 | */ | |
448 | rc = of_scan_flat_dt(htab_dt_scan_page_sizes, NULL); | |
449 | if (rc != 0) /* Found */ | |
450 | goto found; | |
451 | ||
452 | /* | |
453 | * Not in the device-tree, let's fallback on known size | |
454 | * list for 16M capable GP & GR | |
455 | */ | |
44ae3ab3 | 456 | if (mmu_has_feature(MMU_FTR_16M_PAGE)) |
3c726f8d BH |
457 | memcpy(mmu_psize_defs, mmu_psize_defaults_gp, |
458 | sizeof(mmu_psize_defaults_gp)); | |
459 | found: | |
370a908d | 460 | #ifndef CONFIG_DEBUG_PAGEALLOC |
3c726f8d BH |
461 | /* |
462 | * Pick a size for the linear mapping. Currently, we only support | |
463 | * 16M, 1M and 4K which is the default | |
464 | */ | |
465 | if (mmu_psize_defs[MMU_PAGE_16M].shift) | |
466 | mmu_linear_psize = MMU_PAGE_16M; | |
467 | else if (mmu_psize_defs[MMU_PAGE_1M].shift) | |
468 | mmu_linear_psize = MMU_PAGE_1M; | |
370a908d | 469 | #endif /* CONFIG_DEBUG_PAGEALLOC */ |
3c726f8d | 470 | |
bf72aeba | 471 | #ifdef CONFIG_PPC_64K_PAGES |
3c726f8d BH |
472 | /* |
473 | * Pick a size for the ordinary pages. Default is 4K, we support | |
bf72aeba PM |
474 | * 64K for user mappings and vmalloc if supported by the processor. |
475 | * We only use 64k for ioremap if the processor | |
476 | * (and firmware) support cache-inhibited large pages. | |
477 | * If not, we use 4k and set mmu_ci_restrictions so that | |
478 | * hash_page knows to switch processes that use cache-inhibited | |
479 | * mappings to 4k pages. | |
3c726f8d | 480 | */ |
bf72aeba | 481 | if (mmu_psize_defs[MMU_PAGE_64K].shift) { |
3c726f8d | 482 | mmu_virtual_psize = MMU_PAGE_64K; |
bf72aeba | 483 | mmu_vmalloc_psize = MMU_PAGE_64K; |
370a908d BH |
484 | if (mmu_linear_psize == MMU_PAGE_4K) |
485 | mmu_linear_psize = MMU_PAGE_64K; | |
44ae3ab3 | 486 | if (mmu_has_feature(MMU_FTR_CI_LARGE_PAGE)) { |
cfe666b1 PM |
487 | /* |
488 | * Don't use 64k pages for ioremap on pSeries, since | |
489 | * that would stop us accessing the HEA ethernet. | |
490 | */ | |
491 | if (!machine_is(pseries)) | |
492 | mmu_io_psize = MMU_PAGE_64K; | |
493 | } else | |
bf72aeba PM |
494 | mmu_ci_restrictions = 1; |
495 | } | |
370a908d | 496 | #endif /* CONFIG_PPC_64K_PAGES */ |
3c726f8d | 497 | |
cec08e7a BH |
498 | #ifdef CONFIG_SPARSEMEM_VMEMMAP |
499 | /* We try to use 16M pages for vmemmap if that is supported | |
500 | * and we have at least 1G of RAM at boot | |
501 | */ | |
502 | if (mmu_psize_defs[MMU_PAGE_16M].shift && | |
95f72d1e | 503 | memblock_phys_mem_size() >= 0x40000000) |
cec08e7a BH |
504 | mmu_vmemmap_psize = MMU_PAGE_16M; |
505 | else if (mmu_psize_defs[MMU_PAGE_64K].shift) | |
506 | mmu_vmemmap_psize = MMU_PAGE_64K; | |
507 | else | |
508 | mmu_vmemmap_psize = MMU_PAGE_4K; | |
509 | #endif /* CONFIG_SPARSEMEM_VMEMMAP */ | |
510 | ||
bf72aeba | 511 | printk(KERN_DEBUG "Page orders: linear mapping = %d, " |
cec08e7a BH |
512 | "virtual = %d, io = %d" |
513 | #ifdef CONFIG_SPARSEMEM_VMEMMAP | |
514 | ", vmemmap = %d" | |
515 | #endif | |
516 | "\n", | |
3c726f8d | 517 | mmu_psize_defs[mmu_linear_psize].shift, |
bf72aeba | 518 | mmu_psize_defs[mmu_virtual_psize].shift, |
cec08e7a BH |
519 | mmu_psize_defs[mmu_io_psize].shift |
520 | #ifdef CONFIG_SPARSEMEM_VMEMMAP | |
521 | ,mmu_psize_defs[mmu_vmemmap_psize].shift | |
522 | #endif | |
523 | ); | |
3c726f8d BH |
524 | |
525 | #ifdef CONFIG_HUGETLB_PAGE | |
658013e9 JT |
526 | /* Reserve 16G huge page memory sections for huge pages */ |
527 | of_scan_flat_dt(htab_dt_scan_hugepage_blocks, NULL); | |
3c726f8d BH |
528 | #endif /* CONFIG_HUGETLB_PAGE */ |
529 | } | |
530 | ||
531 | static int __init htab_dt_scan_pftsize(unsigned long node, | |
532 | const char *uname, int depth, | |
533 | void *data) | |
534 | { | |
535 | char *type = of_get_flat_dt_prop(node, "device_type", NULL); | |
536 | u32 *prop; | |
537 | ||
538 | /* We are scanning "cpu" nodes only */ | |
539 | if (type == NULL || strcmp(type, "cpu") != 0) | |
540 | return 0; | |
541 | ||
542 | prop = (u32 *)of_get_flat_dt_prop(node, "ibm,pft-size", NULL); | |
543 | if (prop != NULL) { | |
544 | /* pft_size[0] is the NUMA CEC cookie */ | |
545 | ppc64_pft_size = prop[1]; | |
546 | return 1; | |
1da177e4 | 547 | } |
3c726f8d | 548 | return 0; |
1da177e4 LT |
549 | } |
550 | ||
3c726f8d | 551 | static unsigned long __init htab_get_table_size(void) |
3eac8c69 | 552 | { |
13870b65 | 553 | unsigned long mem_size, rnd_mem_size, pteg_count, psize; |
3eac8c69 | 554 | |
3c726f8d | 555 | /* If hash size isn't already provided by the platform, we try to |
943ffb58 | 556 | * retrieve it from the device-tree. If it's not there neither, we |
3c726f8d | 557 | * calculate it now based on the total RAM size |
3eac8c69 | 558 | */ |
3c726f8d BH |
559 | if (ppc64_pft_size == 0) |
560 | of_scan_flat_dt(htab_dt_scan_pftsize, NULL); | |
3eac8c69 PM |
561 | if (ppc64_pft_size) |
562 | return 1UL << ppc64_pft_size; | |
563 | ||
564 | /* round mem_size up to next power of 2 */ | |
95f72d1e | 565 | mem_size = memblock_phys_mem_size(); |
799d6046 PM |
566 | rnd_mem_size = 1UL << __ilog2(mem_size); |
567 | if (rnd_mem_size < mem_size) | |
3eac8c69 PM |
568 | rnd_mem_size <<= 1; |
569 | ||
570 | /* # pages / 2 */ | |
13870b65 AB |
571 | psize = mmu_psize_defs[mmu_virtual_psize].shift; |
572 | pteg_count = max(rnd_mem_size >> (psize + 1), 1UL << 11); | |
3eac8c69 PM |
573 | |
574 | return pteg_count << 7; | |
575 | } | |
576 | ||
54b79248 | 577 | #ifdef CONFIG_MEMORY_HOTPLUG |
a1194097 | 578 | int create_section_mapping(unsigned long start, unsigned long end) |
54b79248 | 579 | { |
a1194097 | 580 | return htab_bolt_mapping(start, end, __pa(start), |
f5ea64dc | 581 | pgprot_val(PAGE_KERNEL), mmu_linear_psize, |
a1194097 | 582 | mmu_kernel_ssize); |
54b79248 | 583 | } |
f8c8803b | 584 | |
52db9b44 | 585 | int remove_section_mapping(unsigned long start, unsigned long end) |
f8c8803b | 586 | { |
52db9b44 BP |
587 | return htab_remove_mapping(start, end, mmu_linear_psize, |
588 | mmu_kernel_ssize); | |
f8c8803b | 589 | } |
54b79248 MK |
590 | #endif /* CONFIG_MEMORY_HOTPLUG */ |
591 | ||
b68a70c4 | 592 | #define FUNCTION_TEXT(A) ((*(unsigned long *)(A))) |
7d0daae4 ME |
593 | |
594 | static void __init htab_finish_init(void) | |
595 | { | |
596 | extern unsigned int *htab_call_hpte_insert1; | |
597 | extern unsigned int *htab_call_hpte_insert2; | |
598 | extern unsigned int *htab_call_hpte_remove; | |
599 | extern unsigned int *htab_call_hpte_updatepp; | |
600 | ||
16c2d476 | 601 | #ifdef CONFIG_PPC_HAS_HASH_64K |
7d0daae4 ME |
602 | extern unsigned int *ht64_call_hpte_insert1; |
603 | extern unsigned int *ht64_call_hpte_insert2; | |
604 | extern unsigned int *ht64_call_hpte_remove; | |
605 | extern unsigned int *ht64_call_hpte_updatepp; | |
606 | ||
b68a70c4 AB |
607 | patch_branch(ht64_call_hpte_insert1, |
608 | FUNCTION_TEXT(ppc_md.hpte_insert), | |
609 | BRANCH_SET_LINK); | |
610 | patch_branch(ht64_call_hpte_insert2, | |
611 | FUNCTION_TEXT(ppc_md.hpte_insert), | |
612 | BRANCH_SET_LINK); | |
613 | patch_branch(ht64_call_hpte_remove, | |
614 | FUNCTION_TEXT(ppc_md.hpte_remove), | |
615 | BRANCH_SET_LINK); | |
616 | patch_branch(ht64_call_hpte_updatepp, | |
617 | FUNCTION_TEXT(ppc_md.hpte_updatepp), | |
618 | BRANCH_SET_LINK); | |
619 | ||
5b825831 | 620 | #endif /* CONFIG_PPC_HAS_HASH_64K */ |
7d0daae4 | 621 | |
b68a70c4 AB |
622 | patch_branch(htab_call_hpte_insert1, |
623 | FUNCTION_TEXT(ppc_md.hpte_insert), | |
624 | BRANCH_SET_LINK); | |
625 | patch_branch(htab_call_hpte_insert2, | |
626 | FUNCTION_TEXT(ppc_md.hpte_insert), | |
627 | BRANCH_SET_LINK); | |
628 | patch_branch(htab_call_hpte_remove, | |
629 | FUNCTION_TEXT(ppc_md.hpte_remove), | |
630 | BRANCH_SET_LINK); | |
631 | patch_branch(htab_call_hpte_updatepp, | |
632 | FUNCTION_TEXT(ppc_md.hpte_updatepp), | |
633 | BRANCH_SET_LINK); | |
7d0daae4 ME |
634 | } |
635 | ||
757c74d2 | 636 | static void __init htab_initialize(void) |
1da177e4 | 637 | { |
337a7128 | 638 | unsigned long table; |
1da177e4 | 639 | unsigned long pteg_count; |
9e88ba4e | 640 | unsigned long prot; |
41d824bf | 641 | unsigned long base = 0, size = 0, limit; |
28be7072 | 642 | struct memblock_region *reg; |
3c726f8d | 643 | |
1da177e4 LT |
644 | DBG(" -> htab_initialize()\n"); |
645 | ||
1189be65 PM |
646 | /* Initialize segment sizes */ |
647 | htab_init_seg_sizes(); | |
648 | ||
3c726f8d BH |
649 | /* Initialize page sizes */ |
650 | htab_init_page_sizes(); | |
651 | ||
44ae3ab3 | 652 | if (mmu_has_feature(MMU_FTR_1T_SEGMENT)) { |
1189be65 PM |
653 | mmu_kernel_ssize = MMU_SEGSIZE_1T; |
654 | mmu_highuser_ssize = MMU_SEGSIZE_1T; | |
655 | printk(KERN_INFO "Using 1TB segments\n"); | |
656 | } | |
657 | ||
1da177e4 LT |
658 | /* |
659 | * Calculate the required size of the htab. We want the number of | |
660 | * PTEGs to equal one half the number of real pages. | |
661 | */ | |
3c726f8d | 662 | htab_size_bytes = htab_get_table_size(); |
1da177e4 LT |
663 | pteg_count = htab_size_bytes >> 7; |
664 | ||
1da177e4 LT |
665 | htab_hash_mask = pteg_count - 1; |
666 | ||
57cfb814 | 667 | if (firmware_has_feature(FW_FEATURE_LPAR)) { |
1da177e4 LT |
668 | /* Using a hypervisor which owns the htab */ |
669 | htab_address = NULL; | |
670 | _SDR1 = 0; | |
3ccc00a7 MS |
671 | #ifdef CONFIG_FA_DUMP |
672 | /* | |
673 | * If firmware assisted dump is active firmware preserves | |
674 | * the contents of htab along with entire partition memory. | |
675 | * Clear the htab if firmware assisted dump is active so | |
676 | * that we dont end up using old mappings. | |
677 | */ | |
678 | if (is_fadump_active() && ppc_md.hpte_clear_all) | |
679 | ppc_md.hpte_clear_all(); | |
680 | #endif | |
1da177e4 LT |
681 | } else { |
682 | /* Find storage for the HPT. Must be contiguous in | |
41d824bf | 683 | * the absolute address space. On cell we want it to be |
31bf1119 | 684 | * in the first 2 Gig so we can use it for IOMMU hacks. |
1da177e4 | 685 | */ |
41d824bf | 686 | if (machine_is(cell)) |
31bf1119 | 687 | limit = 0x80000000; |
41d824bf | 688 | else |
27f574c2 | 689 | limit = MEMBLOCK_ALLOC_ANYWHERE; |
41d824bf | 690 | |
95f72d1e | 691 | table = memblock_alloc_base(htab_size_bytes, htab_size_bytes, limit); |
1da177e4 LT |
692 | |
693 | DBG("Hash table allocated at %lx, size: %lx\n", table, | |
694 | htab_size_bytes); | |
695 | ||
70267a7f | 696 | htab_address = __va(table); |
1da177e4 LT |
697 | |
698 | /* htab absolute addr + encoded htabsize */ | |
699 | _SDR1 = table + __ilog2(pteg_count) - 11; | |
700 | ||
701 | /* Initialize the HPT with no entries */ | |
702 | memset((void *)table, 0, htab_size_bytes); | |
799d6046 PM |
703 | |
704 | /* Set SDR1 */ | |
705 | mtspr(SPRN_SDR1, _SDR1); | |
1da177e4 LT |
706 | } |
707 | ||
f5ea64dc | 708 | prot = pgprot_val(PAGE_KERNEL); |
1da177e4 | 709 | |
370a908d | 710 | #ifdef CONFIG_DEBUG_PAGEALLOC |
95f72d1e YL |
711 | linear_map_hash_count = memblock_end_of_DRAM() >> PAGE_SHIFT; |
712 | linear_map_hash_slots = __va(memblock_alloc_base(linear_map_hash_count, | |
cd3db0c4 | 713 | 1, ppc64_rma_size)); |
370a908d BH |
714 | memset(linear_map_hash_slots, 0, linear_map_hash_count); |
715 | #endif /* CONFIG_DEBUG_PAGEALLOC */ | |
716 | ||
1da177e4 LT |
717 | /* On U3 based machines, we need to reserve the DART area and |
718 | * _NOT_ map it to avoid cache paradoxes as it's remapped non | |
719 | * cacheable later on | |
720 | */ | |
1da177e4 LT |
721 | |
722 | /* create bolted the linear mapping in the hash table */ | |
28be7072 BH |
723 | for_each_memblock(memory, reg) { |
724 | base = (unsigned long)__va(reg->base); | |
725 | size = reg->size; | |
1da177e4 | 726 | |
5c339919 | 727 | DBG("creating mapping for region: %lx..%lx (prot: %lx)\n", |
9e88ba4e | 728 | base, size, prot); |
1da177e4 LT |
729 | |
730 | #ifdef CONFIG_U3_DART | |
731 | /* Do not map the DART space. Fortunately, it will be aligned | |
95f72d1e | 732 | * in such a way that it will not cross two memblock regions and |
3c726f8d BH |
733 | * will fit within a single 16Mb page. |
734 | * The DART space is assumed to be a full 16Mb region even if | |
735 | * we only use 2Mb of that space. We will use more of it later | |
736 | * for AGP GART. We have to use a full 16Mb large page. | |
1da177e4 LT |
737 | */ |
738 | DBG("DART base: %lx\n", dart_tablebase); | |
739 | ||
740 | if (dart_tablebase != 0 && dart_tablebase >= base | |
741 | && dart_tablebase < (base + size)) { | |
caf80e57 | 742 | unsigned long dart_table_end = dart_tablebase + 16 * MB; |
1da177e4 | 743 | if (base != dart_tablebase) |
3c726f8d | 744 | BUG_ON(htab_bolt_mapping(base, dart_tablebase, |
9e88ba4e | 745 | __pa(base), prot, |
1189be65 PM |
746 | mmu_linear_psize, |
747 | mmu_kernel_ssize)); | |
caf80e57 | 748 | if ((base + size) > dart_table_end) |
3c726f8d | 749 | BUG_ON(htab_bolt_mapping(dart_tablebase+16*MB, |
caf80e57 ME |
750 | base + size, |
751 | __pa(dart_table_end), | |
9e88ba4e | 752 | prot, |
1189be65 PM |
753 | mmu_linear_psize, |
754 | mmu_kernel_ssize)); | |
1da177e4 LT |
755 | continue; |
756 | } | |
757 | #endif /* CONFIG_U3_DART */ | |
caf80e57 | 758 | BUG_ON(htab_bolt_mapping(base, base + size, __pa(base), |
9e88ba4e | 759 | prot, mmu_linear_psize, mmu_kernel_ssize)); |
e63075a3 BH |
760 | } |
761 | memblock_set_current_limit(MEMBLOCK_ALLOC_ANYWHERE); | |
1da177e4 LT |
762 | |
763 | /* | |
764 | * If we have a memory_limit and we've allocated TCEs then we need to | |
765 | * explicitly map the TCE area at the top of RAM. We also cope with the | |
766 | * case that the TCEs start below memory_limit. | |
767 | * tce_alloc_start/end are 16MB aligned so the mapping should work | |
768 | * for either 4K or 16MB pages. | |
769 | */ | |
770 | if (tce_alloc_start) { | |
b5666f70 ME |
771 | tce_alloc_start = (unsigned long)__va(tce_alloc_start); |
772 | tce_alloc_end = (unsigned long)__va(tce_alloc_end); | |
1da177e4 LT |
773 | |
774 | if (base + size >= tce_alloc_start) | |
775 | tce_alloc_start = base + size + 1; | |
776 | ||
caf80e57 | 777 | BUG_ON(htab_bolt_mapping(tce_alloc_start, tce_alloc_end, |
bc033b63 | 778 | __pa(tce_alloc_start), prot, |
1189be65 | 779 | mmu_linear_psize, mmu_kernel_ssize)); |
1da177e4 LT |
780 | } |
781 | ||
7d0daae4 ME |
782 | htab_finish_init(); |
783 | ||
1da177e4 LT |
784 | DBG(" <- htab_initialize()\n"); |
785 | } | |
786 | #undef KB | |
787 | #undef MB | |
1da177e4 | 788 | |
757c74d2 | 789 | void __init early_init_mmu(void) |
799d6046 | 790 | { |
757c74d2 BH |
791 | /* Setup initial STAB address in the PACA */ |
792 | get_paca()->stab_real = __pa((u64)&initial_stab); | |
793 | get_paca()->stab_addr = (u64)&initial_stab; | |
794 | ||
795 | /* Initialize the MMU Hash table and create the linear mapping | |
796 | * of memory. Has to be done before stab/slb initialization as | |
797 | * this is currently where the page size encoding is obtained | |
798 | */ | |
799 | htab_initialize(); | |
800 | ||
f5339277 | 801 | /* Initialize stab / SLB management */ |
44ae3ab3 | 802 | if (mmu_has_feature(MMU_FTR_SLB)) |
757c74d2 | 803 | slb_initialize(); |
13938117 BH |
804 | else |
805 | stab_initialize(get_paca()->stab_real); | |
757c74d2 BH |
806 | } |
807 | ||
808 | #ifdef CONFIG_SMP | |
24f1ce80 | 809 | void __cpuinit early_init_mmu_secondary(void) |
757c74d2 BH |
810 | { |
811 | /* Initialize hash table for that CPU */ | |
57cfb814 | 812 | if (!firmware_has_feature(FW_FEATURE_LPAR)) |
799d6046 | 813 | mtspr(SPRN_SDR1, _SDR1); |
757c74d2 BH |
814 | |
815 | /* Initialize STAB/SLB. We use a virtual address as it works | |
f5339277 | 816 | * in real mode on pSeries. |
757c74d2 | 817 | */ |
44ae3ab3 | 818 | if (mmu_has_feature(MMU_FTR_SLB)) |
757c74d2 BH |
819 | slb_initialize(); |
820 | else | |
821 | stab_initialize(get_paca()->stab_addr); | |
799d6046 | 822 | } |
757c74d2 | 823 | #endif /* CONFIG_SMP */ |
799d6046 | 824 | |
1da177e4 LT |
825 | /* |
826 | * Called by asm hashtable.S for doing lazy icache flush | |
827 | */ | |
828 | unsigned int hash_page_do_lazy_icache(unsigned int pp, pte_t pte, int trap) | |
829 | { | |
830 | struct page *page; | |
831 | ||
76c8e25b BH |
832 | if (!pfn_valid(pte_pfn(pte))) |
833 | return pp; | |
834 | ||
1da177e4 LT |
835 | page = pte_page(pte); |
836 | ||
837 | /* page is dirty */ | |
838 | if (!test_bit(PG_arch_1, &page->flags) && !PageReserved(page)) { | |
839 | if (trap == 0x400) { | |
0895ecda | 840 | flush_dcache_icache_page(page); |
1da177e4 LT |
841 | set_bit(PG_arch_1, &page->flags); |
842 | } else | |
3c726f8d | 843 | pp |= HPTE_R_N; |
1da177e4 LT |
844 | } |
845 | return pp; | |
846 | } | |
847 | ||
3a8247cc PM |
848 | #ifdef CONFIG_PPC_MM_SLICES |
849 | unsigned int get_paca_psize(unsigned long addr) | |
850 | { | |
7aa0727f AK |
851 | u64 lpsizes; |
852 | unsigned char *hpsizes; | |
853 | unsigned long index, mask_index; | |
3a8247cc PM |
854 | |
855 | if (addr < SLICE_LOW_TOP) { | |
7aa0727f | 856 | lpsizes = get_paca()->context.low_slices_psize; |
3a8247cc | 857 | index = GET_LOW_SLICE_INDEX(addr); |
7aa0727f | 858 | return (lpsizes >> (index * 4)) & 0xF; |
3a8247cc | 859 | } |
7aa0727f AK |
860 | hpsizes = get_paca()->context.high_slices_psize; |
861 | index = GET_HIGH_SLICE_INDEX(addr); | |
862 | mask_index = index & 0x1; | |
863 | return (hpsizes[index >> 1] >> (mask_index * 4)) & 0xF; | |
3a8247cc PM |
864 | } |
865 | ||
866 | #else | |
867 | unsigned int get_paca_psize(unsigned long addr) | |
868 | { | |
869 | return get_paca()->context.user_psize; | |
870 | } | |
871 | #endif | |
872 | ||
721151d0 PM |
873 | /* |
874 | * Demote a segment to using 4k pages. | |
875 | * For now this makes the whole process use 4k pages. | |
876 | */ | |
721151d0 | 877 | #ifdef CONFIG_PPC_64K_PAGES |
fa28237c | 878 | void demote_segment_4k(struct mm_struct *mm, unsigned long addr) |
16f1c746 | 879 | { |
3a8247cc | 880 | if (get_slice_psize(mm, addr) == MMU_PAGE_4K) |
721151d0 | 881 | return; |
3a8247cc | 882 | slice_set_range_psize(mm, addr, 1, MMU_PAGE_4K); |
1e57ba8d | 883 | #ifdef CONFIG_SPU_BASE |
721151d0 PM |
884 | spu_flush_all_slbs(mm); |
885 | #endif | |
3a8247cc | 886 | if (get_paca_psize(addr) != MMU_PAGE_4K) { |
fa28237c PM |
887 | get_paca()->context = mm->context; |
888 | slb_flush_and_rebolt(); | |
889 | } | |
721151d0 | 890 | } |
16f1c746 | 891 | #endif /* CONFIG_PPC_64K_PAGES */ |
721151d0 | 892 | |
fa28237c PM |
893 | #ifdef CONFIG_PPC_SUBPAGE_PROT |
894 | /* | |
895 | * This looks up a 2-bit protection code for a 4k subpage of a 64k page. | |
896 | * Userspace sets the subpage permissions using the subpage_prot system call. | |
897 | * | |
898 | * Result is 0: full permissions, _PAGE_RW: read-only, | |
899 | * _PAGE_USER or _PAGE_USER|_PAGE_RW: no access. | |
900 | */ | |
d28513bc | 901 | static int subpage_protection(struct mm_struct *mm, unsigned long ea) |
fa28237c | 902 | { |
d28513bc | 903 | struct subpage_prot_table *spt = &mm->context.spt; |
fa28237c PM |
904 | u32 spp = 0; |
905 | u32 **sbpm, *sbpp; | |
906 | ||
907 | if (ea >= spt->maxaddr) | |
908 | return 0; | |
909 | if (ea < 0x100000000) { | |
910 | /* addresses below 4GB use spt->low_prot */ | |
911 | sbpm = spt->low_prot; | |
912 | } else { | |
913 | sbpm = spt->protptrs[ea >> SBP_L3_SHIFT]; | |
914 | if (!sbpm) | |
915 | return 0; | |
916 | } | |
917 | sbpp = sbpm[(ea >> SBP_L2_SHIFT) & (SBP_L2_COUNT - 1)]; | |
918 | if (!sbpp) | |
919 | return 0; | |
920 | spp = sbpp[(ea >> PAGE_SHIFT) & (SBP_L1_COUNT - 1)]; | |
921 | ||
922 | /* extract 2-bit bitfield for this 4k subpage */ | |
923 | spp >>= 30 - 2 * ((ea >> 12) & 0xf); | |
924 | ||
925 | /* turn 0,1,2,3 into combination of _PAGE_USER and _PAGE_RW */ | |
926 | spp = ((spp & 2) ? _PAGE_USER : 0) | ((spp & 1) ? _PAGE_RW : 0); | |
927 | return spp; | |
928 | } | |
929 | ||
930 | #else /* CONFIG_PPC_SUBPAGE_PROT */ | |
d28513bc | 931 | static inline int subpage_protection(struct mm_struct *mm, unsigned long ea) |
fa28237c PM |
932 | { |
933 | return 0; | |
934 | } | |
935 | #endif | |
936 | ||
4b8692c0 BH |
937 | void hash_failure_debug(unsigned long ea, unsigned long access, |
938 | unsigned long vsid, unsigned long trap, | |
d8139ebf | 939 | int ssize, int psize, int lpsize, unsigned long pte) |
4b8692c0 BH |
940 | { |
941 | if (!printk_ratelimit()) | |
942 | return; | |
943 | pr_info("mm: Hashing failure ! EA=0x%lx access=0x%lx current=%s\n", | |
944 | ea, access, current->comm); | |
d8139ebf AK |
945 | pr_info(" trap=0x%lx vsid=0x%lx ssize=%d base psize=%d psize %d pte=0x%lx\n", |
946 | trap, vsid, ssize, psize, lpsize, pte); | |
4b8692c0 BH |
947 | } |
948 | ||
1da177e4 LT |
949 | /* Result code is: |
950 | * 0 - handled | |
951 | * 1 - normal page fault | |
952 | * -1 - critical hash insertion error | |
fa28237c | 953 | * -2 - access not permitted by subpage protection mechanism |
1da177e4 LT |
954 | */ |
955 | int hash_page(unsigned long ea, unsigned long access, unsigned long trap) | |
956 | { | |
a1128f8f | 957 | pgd_t *pgdir; |
1da177e4 LT |
958 | unsigned long vsid; |
959 | struct mm_struct *mm; | |
960 | pte_t *ptep; | |
a4fe3ce7 | 961 | unsigned hugeshift; |
56aa4129 | 962 | const struct cpumask *tmp; |
3c726f8d | 963 | int rc, user_region = 0, local = 0; |
1189be65 | 964 | int psize, ssize; |
1da177e4 | 965 | |
3c726f8d BH |
966 | DBG_LOW("hash_page(ea=%016lx, access=%lx, trap=%lx\n", |
967 | ea, access, trap); | |
1f8d419e | 968 | |
3c726f8d | 969 | /* Get region & vsid */ |
1da177e4 LT |
970 | switch (REGION_ID(ea)) { |
971 | case USER_REGION_ID: | |
972 | user_region = 1; | |
973 | mm = current->mm; | |
3c726f8d BH |
974 | if (! mm) { |
975 | DBG_LOW(" user region with no mm !\n"); | |
1da177e4 | 976 | return 1; |
3c726f8d | 977 | } |
16c2d476 | 978 | psize = get_slice_psize(mm, ea); |
1189be65 PM |
979 | ssize = user_segment_size(ea); |
980 | vsid = get_vsid(mm->context.id, ea, ssize); | |
1da177e4 | 981 | break; |
1da177e4 | 982 | case VMALLOC_REGION_ID: |
1da177e4 | 983 | mm = &init_mm; |
1189be65 | 984 | vsid = get_kernel_vsid(ea, mmu_kernel_ssize); |
bf72aeba PM |
985 | if (ea < VMALLOC_END) |
986 | psize = mmu_vmalloc_psize; | |
987 | else | |
988 | psize = mmu_io_psize; | |
1189be65 | 989 | ssize = mmu_kernel_ssize; |
1da177e4 | 990 | break; |
1da177e4 LT |
991 | default: |
992 | /* Not a valid range | |
993 | * Send the problem up to do_page_fault | |
994 | */ | |
995 | return 1; | |
1da177e4 | 996 | } |
3c726f8d | 997 | DBG_LOW(" mm=%p, mm->pgdir=%p, vsid=%016lx\n", mm, mm->pgd, vsid); |
1da177e4 | 998 | |
c60ac569 AK |
999 | /* Bad address. */ |
1000 | if (!vsid) { | |
1001 | DBG_LOW("Bad address!\n"); | |
1002 | return 1; | |
1003 | } | |
3c726f8d | 1004 | /* Get pgdir */ |
1da177e4 | 1005 | pgdir = mm->pgd; |
1da177e4 LT |
1006 | if (pgdir == NULL) |
1007 | return 1; | |
1008 | ||
3c726f8d | 1009 | /* Check CPU locality */ |
56aa4129 RR |
1010 | tmp = cpumask_of(smp_processor_id()); |
1011 | if (user_region && cpumask_equal(mm_cpumask(mm), tmp)) | |
1da177e4 LT |
1012 | local = 1; |
1013 | ||
16c2d476 | 1014 | #ifndef CONFIG_PPC_64K_PAGES |
a4fe3ce7 DG |
1015 | /* If we use 4K pages and our psize is not 4K, then we might |
1016 | * be hitting a special driver mapping, and need to align the | |
1017 | * address before we fetch the PTE. | |
1018 | * | |
1019 | * It could also be a hugepage mapping, in which case this is | |
1020 | * not necessary, but it's not harmful, either. | |
16c2d476 BH |
1021 | */ |
1022 | if (psize != MMU_PAGE_4K) | |
1023 | ea &= ~((1ul << mmu_psize_defs[psize].shift) - 1); | |
1024 | #endif /* CONFIG_PPC_64K_PAGES */ | |
1025 | ||
3c726f8d | 1026 | /* Get PTE and page size from page tables */ |
a4fe3ce7 | 1027 | ptep = find_linux_pte_or_hugepte(pgdir, ea, &hugeshift); |
3c726f8d BH |
1028 | if (ptep == NULL || !pte_present(*ptep)) { |
1029 | DBG_LOW(" no PTE !\n"); | |
1030 | return 1; | |
1031 | } | |
1032 | ||
ca91e6c0 BH |
1033 | /* Add _PAGE_PRESENT to the required access perm */ |
1034 | access |= _PAGE_PRESENT; | |
1035 | ||
1036 | /* Pre-check access permissions (will be re-checked atomically | |
1037 | * in __hash_page_XX but this pre-check is a fast path | |
1038 | */ | |
1039 | if (access & ~pte_val(*ptep)) { | |
1040 | DBG_LOW(" no access !\n"); | |
1041 | return 1; | |
1042 | } | |
1043 | ||
a4fe3ce7 DG |
1044 | #ifdef CONFIG_HUGETLB_PAGE |
1045 | if (hugeshift) | |
1046 | return __hash_page_huge(ea, access, vsid, ptep, trap, local, | |
1047 | ssize, hugeshift, psize); | |
1048 | #endif /* CONFIG_HUGETLB_PAGE */ | |
1049 | ||
3c726f8d BH |
1050 | #ifndef CONFIG_PPC_64K_PAGES |
1051 | DBG_LOW(" i-pte: %016lx\n", pte_val(*ptep)); | |
1052 | #else | |
1053 | DBG_LOW(" i-pte: %016lx %016lx\n", pte_val(*ptep), | |
1054 | pte_val(*(ptep + PTRS_PER_PTE))); | |
1055 | #endif | |
3c726f8d | 1056 | /* Do actual hashing */ |
16c2d476 | 1057 | #ifdef CONFIG_PPC_64K_PAGES |
721151d0 | 1058 | /* If _PAGE_4K_PFN is set, make sure this is a 4k segment */ |
3a8247cc | 1059 | if ((pte_val(*ptep) & _PAGE_4K_PFN) && psize == MMU_PAGE_64K) { |
721151d0 PM |
1060 | demote_segment_4k(mm, ea); |
1061 | psize = MMU_PAGE_4K; | |
1062 | } | |
1063 | ||
16f1c746 BH |
1064 | /* If this PTE is non-cacheable and we have restrictions on |
1065 | * using non cacheable large pages, then we switch to 4k | |
1066 | */ | |
1067 | if (mmu_ci_restrictions && psize == MMU_PAGE_64K && | |
1068 | (pte_val(*ptep) & _PAGE_NO_CACHE)) { | |
1069 | if (user_region) { | |
1070 | demote_segment_4k(mm, ea); | |
1071 | psize = MMU_PAGE_4K; | |
1072 | } else if (ea < VMALLOC_END) { | |
1073 | /* | |
1074 | * some driver did a non-cacheable mapping | |
1075 | * in vmalloc space, so switch vmalloc | |
1076 | * to 4k pages | |
1077 | */ | |
1078 | printk(KERN_ALERT "Reducing vmalloc segment " | |
1079 | "to 4kB pages because of " | |
1080 | "non-cacheable mapping\n"); | |
1081 | psize = mmu_vmalloc_psize = MMU_PAGE_4K; | |
1e57ba8d | 1082 | #ifdef CONFIG_SPU_BASE |
94b2a439 BH |
1083 | spu_flush_all_slbs(mm); |
1084 | #endif | |
bf72aeba | 1085 | } |
16f1c746 BH |
1086 | } |
1087 | if (user_region) { | |
3a8247cc | 1088 | if (psize != get_paca_psize(ea)) { |
f6ab0b92 | 1089 | get_paca()->context = mm->context; |
bf72aeba PM |
1090 | slb_flush_and_rebolt(); |
1091 | } | |
16f1c746 BH |
1092 | } else if (get_paca()->vmalloc_sllp != |
1093 | mmu_psize_defs[mmu_vmalloc_psize].sllp) { | |
1094 | get_paca()->vmalloc_sllp = | |
1095 | mmu_psize_defs[mmu_vmalloc_psize].sllp; | |
67439b76 | 1096 | slb_vmalloc_update(); |
bf72aeba | 1097 | } |
16c2d476 | 1098 | #endif /* CONFIG_PPC_64K_PAGES */ |
16f1c746 | 1099 | |
16c2d476 | 1100 | #ifdef CONFIG_PPC_HAS_HASH_64K |
bf72aeba | 1101 | if (psize == MMU_PAGE_64K) |
1189be65 | 1102 | rc = __hash_page_64K(ea, access, vsid, ptep, trap, local, ssize); |
3c726f8d | 1103 | else |
16c2d476 | 1104 | #endif /* CONFIG_PPC_HAS_HASH_64K */ |
fa28237c | 1105 | { |
a1128f8f | 1106 | int spp = subpage_protection(mm, ea); |
fa28237c PM |
1107 | if (access & spp) |
1108 | rc = -2; | |
1109 | else | |
1110 | rc = __hash_page_4K(ea, access, vsid, ptep, trap, | |
1111 | local, ssize, spp); | |
1112 | } | |
3c726f8d | 1113 | |
4b8692c0 BH |
1114 | /* Dump some info in case of hash insertion failure, they should |
1115 | * never happen so it is really useful to know if/when they do | |
1116 | */ | |
1117 | if (rc == -1) | |
1118 | hash_failure_debug(ea, access, vsid, trap, ssize, psize, | |
d8139ebf | 1119 | psize, pte_val(*ptep)); |
3c726f8d BH |
1120 | #ifndef CONFIG_PPC_64K_PAGES |
1121 | DBG_LOW(" o-pte: %016lx\n", pte_val(*ptep)); | |
1122 | #else | |
1123 | DBG_LOW(" o-pte: %016lx %016lx\n", pte_val(*ptep), | |
1124 | pte_val(*(ptep + PTRS_PER_PTE))); | |
1125 | #endif | |
1126 | DBG_LOW(" -> rc=%d\n", rc); | |
1127 | return rc; | |
1da177e4 | 1128 | } |
67207b96 | 1129 | EXPORT_SYMBOL_GPL(hash_page); |
1da177e4 | 1130 | |
3c726f8d BH |
1131 | void hash_preload(struct mm_struct *mm, unsigned long ea, |
1132 | unsigned long access, unsigned long trap) | |
1da177e4 | 1133 | { |
3c726f8d | 1134 | unsigned long vsid; |
0b97fee0 | 1135 | pgd_t *pgdir; |
3c726f8d | 1136 | pte_t *ptep; |
3c726f8d | 1137 | unsigned long flags; |
4b8692c0 | 1138 | int rc, ssize, local = 0; |
3c726f8d | 1139 | |
d0f13e3c BH |
1140 | BUG_ON(REGION_ID(ea) != USER_REGION_ID); |
1141 | ||
1142 | #ifdef CONFIG_PPC_MM_SLICES | |
1143 | /* We only prefault standard pages for now */ | |
2b02d139 | 1144 | if (unlikely(get_slice_psize(mm, ea) != mm->context.user_psize)) |
3c726f8d | 1145 | return; |
d0f13e3c | 1146 | #endif |
3c726f8d BH |
1147 | |
1148 | DBG_LOW("hash_preload(mm=%p, mm->pgdir=%p, ea=%016lx, access=%lx," | |
1149 | " trap=%lx\n", mm, mm->pgd, ea, access, trap); | |
1da177e4 | 1150 | |
16f1c746 | 1151 | /* Get Linux PTE if available */ |
3c726f8d BH |
1152 | pgdir = mm->pgd; |
1153 | if (pgdir == NULL) | |
1154 | return; | |
1155 | ptep = find_linux_pte(pgdir, ea); | |
1156 | if (!ptep) | |
1157 | return; | |
16f1c746 BH |
1158 | |
1159 | #ifdef CONFIG_PPC_64K_PAGES | |
1160 | /* If either _PAGE_4K_PFN or _PAGE_NO_CACHE is set (and we are on | |
1161 | * a 64K kernel), then we don't preload, hash_page() will take | |
1162 | * care of it once we actually try to access the page. | |
1163 | * That way we don't have to duplicate all of the logic for segment | |
1164 | * page size demotion here | |
1165 | */ | |
1166 | if (pte_val(*ptep) & (_PAGE_4K_PFN | _PAGE_NO_CACHE)) | |
1167 | return; | |
1168 | #endif /* CONFIG_PPC_64K_PAGES */ | |
1169 | ||
1170 | /* Get VSID */ | |
1189be65 PM |
1171 | ssize = user_segment_size(ea); |
1172 | vsid = get_vsid(mm->context.id, ea, ssize); | |
c60ac569 AK |
1173 | if (!vsid) |
1174 | return; | |
3c726f8d | 1175 | |
16c2d476 | 1176 | /* Hash doesn't like irqs */ |
3c726f8d | 1177 | local_irq_save(flags); |
16c2d476 BH |
1178 | |
1179 | /* Is that local to this CPU ? */ | |
56aa4129 | 1180 | if (cpumask_equal(mm_cpumask(mm), cpumask_of(smp_processor_id()))) |
3c726f8d | 1181 | local = 1; |
16c2d476 BH |
1182 | |
1183 | /* Hash it in */ | |
1184 | #ifdef CONFIG_PPC_HAS_HASH_64K | |
bf72aeba | 1185 | if (mm->context.user_psize == MMU_PAGE_64K) |
4b8692c0 | 1186 | rc = __hash_page_64K(ea, access, vsid, ptep, trap, local, ssize); |
1da177e4 | 1187 | else |
5b825831 | 1188 | #endif /* CONFIG_PPC_HAS_HASH_64K */ |
4b8692c0 | 1189 | rc = __hash_page_4K(ea, access, vsid, ptep, trap, local, ssize, |
1c2c25c7 | 1190 | subpage_protection(mm, ea)); |
4b8692c0 BH |
1191 | |
1192 | /* Dump some info in case of hash insertion failure, they should | |
1193 | * never happen so it is really useful to know if/when they do | |
1194 | */ | |
1195 | if (rc == -1) | |
1196 | hash_failure_debug(ea, access, vsid, trap, ssize, | |
d8139ebf AK |
1197 | mm->context.user_psize, |
1198 | mm->context.user_psize, | |
1199 | pte_val(*ptep)); | |
16c2d476 | 1200 | |
3c726f8d BH |
1201 | local_irq_restore(flags); |
1202 | } | |
1203 | ||
f6ab0b92 BH |
1204 | /* WARNING: This is called from hash_low_64.S, if you change this prototype, |
1205 | * do not forget to update the assembly call site ! | |
1206 | */ | |
5524a27d | 1207 | void flush_hash_page(unsigned long vpn, real_pte_t pte, int psize, int ssize, |
1189be65 | 1208 | int local) |
3c726f8d BH |
1209 | { |
1210 | unsigned long hash, index, shift, hidx, slot; | |
1211 | ||
5524a27d AK |
1212 | DBG_LOW("flush_hash_page(vpn=%016lx)\n", vpn); |
1213 | pte_iterate_hashed_subpages(pte, psize, vpn, index, shift) { | |
1214 | hash = hpt_hash(vpn, shift, ssize); | |
3c726f8d BH |
1215 | hidx = __rpte_to_hidx(pte, index); |
1216 | if (hidx & _PTEIDX_SECONDARY) | |
1217 | hash = ~hash; | |
1218 | slot = (hash & htab_hash_mask) * HPTES_PER_GROUP; | |
1219 | slot += hidx & _PTEIDX_GROUP_IX; | |
5c339919 | 1220 | DBG_LOW(" sub %ld: hash=%lx, hidx=%lx\n", index, slot, hidx); |
5524a27d | 1221 | ppc_md.hpte_invalidate(slot, vpn, psize, ssize, local); |
3c726f8d | 1222 | } pte_iterate_hashed_end(); |
bc2a9408 MN |
1223 | |
1224 | #ifdef CONFIG_PPC_TRANSACTIONAL_MEM | |
1225 | /* Transactions are not aborted by tlbiel, only tlbie. | |
1226 | * Without, syncing a page back to a block device w/ PIO could pick up | |
1227 | * transactional data (bad!) so we force an abort here. Before the | |
1228 | * sync the page will be made read-only, which will flush_hash_page. | |
1229 | * BIG ISSUE here: if the kernel uses a page from userspace without | |
1230 | * unmapping it first, it may see the speculated version. | |
1231 | */ | |
1232 | if (local && cpu_has_feature(CPU_FTR_TM) && | |
1233 | MSR_TM_ACTIVE(current->thread.regs->msr)) { | |
1234 | tm_enable(); | |
1235 | tm_abort(TM_CAUSE_TLBI); | |
1236 | } | |
1237 | #endif | |
1da177e4 LT |
1238 | } |
1239 | ||
61b1a942 | 1240 | void flush_hash_range(unsigned long number, int local) |
1da177e4 | 1241 | { |
3c726f8d | 1242 | if (ppc_md.flush_hash_range) |
61b1a942 | 1243 | ppc_md.flush_hash_range(number, local); |
3c726f8d | 1244 | else { |
1da177e4 | 1245 | int i; |
61b1a942 BH |
1246 | struct ppc64_tlb_batch *batch = |
1247 | &__get_cpu_var(ppc64_tlb_batch); | |
1da177e4 LT |
1248 | |
1249 | for (i = 0; i < number; i++) | |
5524a27d | 1250 | flush_hash_page(batch->vpn[i], batch->pte[i], |
1189be65 | 1251 | batch->psize, batch->ssize, local); |
1da177e4 LT |
1252 | } |
1253 | } | |
1254 | ||
1da177e4 LT |
1255 | /* |
1256 | * low_hash_fault is called when we the low level hash code failed | |
1257 | * to instert a PTE due to an hypervisor error | |
1258 | */ | |
fa28237c | 1259 | void low_hash_fault(struct pt_regs *regs, unsigned long address, int rc) |
1da177e4 LT |
1260 | { |
1261 | if (user_mode(regs)) { | |
fa28237c PM |
1262 | #ifdef CONFIG_PPC_SUBPAGE_PROT |
1263 | if (rc == -2) | |
1264 | _exception(SIGSEGV, regs, SEGV_ACCERR, address); | |
1265 | else | |
1266 | #endif | |
1267 | _exception(SIGBUS, regs, BUS_ADRERR, address); | |
1268 | } else | |
1269 | bad_page_fault(regs, address, SIGBUS); | |
1da177e4 | 1270 | } |
370a908d | 1271 | |
b170bd3d LZ |
1272 | long hpte_insert_repeating(unsigned long hash, unsigned long vpn, |
1273 | unsigned long pa, unsigned long rflags, | |
1274 | unsigned long vflags, int psize, int ssize) | |
1275 | { | |
1276 | unsigned long hpte_group; | |
1277 | long slot; | |
1278 | ||
1279 | repeat: | |
1280 | hpte_group = ((hash & htab_hash_mask) * | |
1281 | HPTES_PER_GROUP) & ~0x7UL; | |
1282 | ||
1283 | /* Insert into the hash table, primary slot */ | |
1284 | slot = ppc_md.hpte_insert(hpte_group, vpn, pa, rflags, vflags, | |
b1022fbd | 1285 | psize, psize, ssize); |
b170bd3d LZ |
1286 | |
1287 | /* Primary is full, try the secondary */ | |
1288 | if (unlikely(slot == -1)) { | |
1289 | hpte_group = ((~hash & htab_hash_mask) * | |
1290 | HPTES_PER_GROUP) & ~0x7UL; | |
1291 | slot = ppc_md.hpte_insert(hpte_group, vpn, pa, rflags, | |
1292 | vflags | HPTE_V_SECONDARY, | |
b1022fbd | 1293 | psize, psize, ssize); |
b170bd3d LZ |
1294 | if (slot == -1) { |
1295 | if (mftb() & 0x1) | |
1296 | hpte_group = ((hash & htab_hash_mask) * | |
1297 | HPTES_PER_GROUP)&~0x7UL; | |
1298 | ||
1299 | ppc_md.hpte_remove(hpte_group); | |
1300 | goto repeat; | |
1301 | } | |
1302 | } | |
1303 | ||
1304 | return slot; | |
1305 | } | |
1306 | ||
370a908d BH |
1307 | #ifdef CONFIG_DEBUG_PAGEALLOC |
1308 | static void kernel_map_linear_page(unsigned long vaddr, unsigned long lmi) | |
1309 | { | |
016af59f | 1310 | unsigned long hash; |
1189be65 | 1311 | unsigned long vsid = get_kernel_vsid(vaddr, mmu_kernel_ssize); |
5524a27d | 1312 | unsigned long vpn = hpt_vpn(vaddr, vsid, mmu_kernel_ssize); |
bc033b63 | 1313 | unsigned long mode = htab_convert_pte_flags(PAGE_KERNEL); |
016af59f | 1314 | long ret; |
370a908d | 1315 | |
5524a27d | 1316 | hash = hpt_hash(vpn, PAGE_SHIFT, mmu_kernel_ssize); |
370a908d | 1317 | |
c60ac569 AK |
1318 | /* Don't create HPTE entries for bad address */ |
1319 | if (!vsid) | |
1320 | return; | |
016af59f LZ |
1321 | |
1322 | ret = hpte_insert_repeating(hash, vpn, __pa(vaddr), mode, | |
1323 | HPTE_V_BOLTED, | |
1324 | mmu_linear_psize, mmu_kernel_ssize); | |
1325 | ||
370a908d BH |
1326 | BUG_ON (ret < 0); |
1327 | spin_lock(&linear_map_hash_lock); | |
1328 | BUG_ON(linear_map_hash_slots[lmi] & 0x80); | |
1329 | linear_map_hash_slots[lmi] = ret | 0x80; | |
1330 | spin_unlock(&linear_map_hash_lock); | |
1331 | } | |
1332 | ||
1333 | static void kernel_unmap_linear_page(unsigned long vaddr, unsigned long lmi) | |
1334 | { | |
1189be65 PM |
1335 | unsigned long hash, hidx, slot; |
1336 | unsigned long vsid = get_kernel_vsid(vaddr, mmu_kernel_ssize); | |
5524a27d | 1337 | unsigned long vpn = hpt_vpn(vaddr, vsid, mmu_kernel_ssize); |
370a908d | 1338 | |
5524a27d | 1339 | hash = hpt_hash(vpn, PAGE_SHIFT, mmu_kernel_ssize); |
370a908d BH |
1340 | spin_lock(&linear_map_hash_lock); |
1341 | BUG_ON(!(linear_map_hash_slots[lmi] & 0x80)); | |
1342 | hidx = linear_map_hash_slots[lmi] & 0x7f; | |
1343 | linear_map_hash_slots[lmi] = 0; | |
1344 | spin_unlock(&linear_map_hash_lock); | |
1345 | if (hidx & _PTEIDX_SECONDARY) | |
1346 | hash = ~hash; | |
1347 | slot = (hash & htab_hash_mask) * HPTES_PER_GROUP; | |
1348 | slot += hidx & _PTEIDX_GROUP_IX; | |
5524a27d | 1349 | ppc_md.hpte_invalidate(slot, vpn, mmu_linear_psize, mmu_kernel_ssize, 0); |
370a908d BH |
1350 | } |
1351 | ||
1352 | void kernel_map_pages(struct page *page, int numpages, int enable) | |
1353 | { | |
1354 | unsigned long flags, vaddr, lmi; | |
1355 | int i; | |
1356 | ||
1357 | local_irq_save(flags); | |
1358 | for (i = 0; i < numpages; i++, page++) { | |
1359 | vaddr = (unsigned long)page_address(page); | |
1360 | lmi = __pa(vaddr) >> PAGE_SHIFT; | |
1361 | if (lmi >= linear_map_hash_count) | |
1362 | continue; | |
1363 | if (enable) | |
1364 | kernel_map_linear_page(vaddr, lmi); | |
1365 | else | |
1366 | kernel_unmap_linear_page(vaddr, lmi); | |
1367 | } | |
1368 | local_irq_restore(flags); | |
1369 | } | |
1370 | #endif /* CONFIG_DEBUG_PAGEALLOC */ | |
cd3db0c4 BH |
1371 | |
1372 | void setup_initial_memory_limit(phys_addr_t first_memblock_base, | |
1373 | phys_addr_t first_memblock_size) | |
1374 | { | |
1375 | /* We don't currently support the first MEMBLOCK not mapping 0 | |
1376 | * physical on those processors | |
1377 | */ | |
1378 | BUG_ON(first_memblock_base != 0); | |
1379 | ||
1380 | /* On LPAR systems, the first entry is our RMA region, | |
1381 | * non-LPAR 64-bit hash MMU systems don't have a limitation | |
1382 | * on real mode access, but using the first entry works well | |
1383 | * enough. We also clamp it to 1G to avoid some funky things | |
1384 | * such as RTAS bugs etc... | |
1385 | */ | |
1386 | ppc64_rma_size = min_t(u64, first_memblock_size, 0x40000000); | |
1387 | ||
1388 | /* Finally limit subsequent allocations */ | |
1389 | memblock_set_current_limit(ppc64_rma_size); | |
1390 | } |