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1da177e4 LT |
1 | /* |
2 | * pSeries_lpar.c | |
3 | * Copyright (C) 2001 Todd Inglett, IBM Corporation | |
4 | * | |
5 | * pSeries LPAR support. | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
20 | */ | |
21 | ||
f7ebf352 ME |
22 | /* Enables debugging of low-level hash table routines - careful! */ |
23 | #undef DEBUG | |
1da177e4 | 24 | |
1da177e4 LT |
25 | #include <linux/kernel.h> |
26 | #include <linux/dma-mapping.h> | |
463ce0e1 | 27 | #include <linux/console.h> |
66b15db6 | 28 | #include <linux/export.h> |
58995a9a | 29 | #include <linux/jump_label.h> |
dbcf929c DG |
30 | #include <linux/delay.h> |
31 | #include <linux/stop_machine.h> | |
1da177e4 LT |
32 | #include <asm/processor.h> |
33 | #include <asm/mmu.h> | |
34 | #include <asm/page.h> | |
35 | #include <asm/pgtable.h> | |
36 | #include <asm/machdep.h> | |
1da177e4 | 37 | #include <asm/mmu_context.h> |
1da177e4 LT |
38 | #include <asm/iommu.h> |
39 | #include <asm/tlbflush.h> | |
40 | #include <asm/tlb.h> | |
41 | #include <asm/prom.h> | |
1da177e4 | 42 | #include <asm/cputable.h> |
dcad47fc | 43 | #include <asm/udbg.h> |
2249ca9d | 44 | #include <asm/smp.h> |
c8cd093a | 45 | #include <asm/trace.h> |
f5339277 | 46 | #include <asm/firmware.h> |
212bebb4 | 47 | #include <asm/plpar_wrappers.h> |
c1caae3d | 48 | #include <asm/kexec.h> |
408cddd9 | 49 | #include <asm/fadump.h> |
42f5b4ca | 50 | #include <asm/asm-prototypes.h> |
a1218720 | 51 | |
21cf9133 | 52 | #include "pseries.h" |
1da177e4 | 53 | |
1a527286 AK |
54 | /* Flag bits for H_BULK_REMOVE */ |
55 | #define HBR_REQUEST 0x4000000000000000UL | |
56 | #define HBR_RESPONSE 0x8000000000000000UL | |
57 | #define HBR_END 0xc000000000000000UL | |
58 | #define HBR_AVPN 0x0200000000000000UL | |
59 | #define HBR_ANDCOND 0x0100000000000000UL | |
60 | ||
1da177e4 | 61 | |
b9377ffc | 62 | /* in hvCall.S */ |
1da177e4 | 63 | EXPORT_SYMBOL(plpar_hcall); |
b9377ffc | 64 | EXPORT_SYMBOL(plpar_hcall9); |
1da177e4 | 65 | EXPORT_SYMBOL(plpar_hcall_norets); |
b9377ffc | 66 | |
1da177e4 LT |
67 | void vpa_init(int cpu) |
68 | { | |
69 | int hwcpu = get_hard_smp_processor_id(cpu); | |
2f6093c8 | 70 | unsigned long addr; |
1da177e4 | 71 | long ret; |
cf9efce0 PM |
72 | struct paca_struct *pp; |
73 | struct dtl_entry *dtl; | |
233ccd0d | 74 | |
b89bdfb8 ME |
75 | /* |
76 | * The spec says it "may be problematic" if CPU x registers the VPA of | |
77 | * CPU y. We should never do that, but wail if we ever do. | |
78 | */ | |
79 | WARN_ON(cpu != smp_processor_id()); | |
80 | ||
233ccd0d | 81 | if (cpu_has_feature(CPU_FTR_ALTIVEC)) |
8154c5d2 | 82 | lppaca_of(cpu).vmxregs_in_use = 1; |
233ccd0d | 83 | |
6e0b8bc9 ME |
84 | if (cpu_has_feature(CPU_FTR_ARCH_207S)) |
85 | lppaca_of(cpu).ebb_regs_in_use = 1; | |
86 | ||
8154c5d2 | 87 | addr = __pa(&lppaca_of(cpu)); |
2f6093c8 | 88 | ret = register_vpa(hwcpu, addr); |
1da177e4 | 89 | |
2f6093c8 | 90 | if (ret) { |
711ef84e AB |
91 | pr_err("WARNING: VPA registration for cpu %d (hw %d) of area " |
92 | "%lx failed with %ld\n", cpu, hwcpu, addr, ret); | |
2f6093c8 MN |
93 | return; |
94 | } | |
d8c476ee AK |
95 | |
96 | #ifdef CONFIG_PPC_STD_MMU_64 | |
2f6093c8 MN |
97 | /* |
98 | * PAPR says this feature is SLB-Buffer but firmware never | |
99 | * reports that. All SPLPAR support SLB shadow buffer. | |
100 | */ | |
d8c476ee AK |
101 | if (!radix_enabled() && firmware_has_feature(FW_FEATURE_SPLPAR)) { |
102 | addr = __pa(paca[cpu].slb_shadow_ptr); | |
2f6093c8 MN |
103 | ret = register_slb_shadow(hwcpu, addr); |
104 | if (ret) | |
711ef84e AB |
105 | pr_err("WARNING: SLB shadow buffer registration for " |
106 | "cpu %d (hw %d) of area %lx failed with %ld\n", | |
107 | cpu, hwcpu, addr, ret); | |
2f6093c8 | 108 | } |
d8c476ee | 109 | #endif /* CONFIG_PPC_STD_MMU_64 */ |
cf9efce0 PM |
110 | |
111 | /* | |
112 | * Register dispatch trace log, if one has been allocated. | |
113 | */ | |
114 | pp = &paca[cpu]; | |
115 | dtl = pp->dispatch_log; | |
116 | if (dtl) { | |
117 | pp->dtl_ridx = 0; | |
118 | pp->dtl_curr = dtl; | |
119 | lppaca_of(cpu).dtl_idx = 0; | |
120 | ||
121 | /* hypervisor reads buffer length from this field */ | |
7ffcf8ec | 122 | dtl->enqueue_to_dispatch_time = cpu_to_be32(DISPATCH_LOG_BYTES); |
cf9efce0 PM |
123 | ret = register_dtl(hwcpu, __pa(dtl)); |
124 | if (ret) | |
711ef84e AB |
125 | pr_err("WARNING: DTL registration of cpu %d (hw %d) " |
126 | "failed with %ld\n", smp_processor_id(), | |
127 | hwcpu, ret); | |
cf9efce0 PM |
128 | lppaca_of(cpu).dtl_enable_mask = 2; |
129 | } | |
1da177e4 LT |
130 | } |
131 | ||
d8c476ee AK |
132 | #ifdef CONFIG_PPC_STD_MMU_64 |
133 | ||
035223fb | 134 | static long pSeries_lpar_hpte_insert(unsigned long hpte_group, |
5524a27d AK |
135 | unsigned long vpn, unsigned long pa, |
136 | unsigned long rflags, unsigned long vflags, | |
b1022fbd | 137 | int psize, int apsize, int ssize) |
1da177e4 | 138 | { |
1da177e4 LT |
139 | unsigned long lpar_rc; |
140 | unsigned long flags; | |
141 | unsigned long slot; | |
96e28449 | 142 | unsigned long hpte_v, hpte_r; |
1da177e4 | 143 | |
3c726f8d | 144 | if (!(vflags & HPTE_V_BOLTED)) |
5524a27d AK |
145 | pr_devel("hpte_insert(group=%lx, vpn=%016lx, " |
146 | "pa=%016lx, rflags=%lx, vflags=%lx, psize=%d)\n", | |
147 | hpte_group, vpn, pa, rflags, vflags, psize); | |
3c726f8d | 148 | |
b1022fbd | 149 | hpte_v = hpte_encode_v(vpn, psize, apsize, ssize) | vflags | HPTE_V_VALID; |
6b243fcf | 150 | hpte_r = hpte_encode_r(pa, psize, apsize) | rflags; |
3c726f8d BH |
151 | |
152 | if (!(vflags & HPTE_V_BOLTED)) | |
551a232c | 153 | pr_devel(" hpte_v=%016lx, hpte_r=%016lx\n", hpte_v, hpte_r); |
3c726f8d | 154 | |
1da177e4 LT |
155 | /* Now fill in the actual HPTE */ |
156 | /* Set CEC cookie to 0 */ | |
157 | /* Zero page = 0 */ | |
158 | /* I-cache Invalidate = 0 */ | |
159 | /* I-cache synchronize = 0 */ | |
160 | /* Exact = 0 */ | |
161 | flags = 0; | |
162 | ||
9ee820fa BK |
163 | if (firmware_has_feature(FW_FEATURE_XCMO) && !(hpte_r & HPTE_R_N)) |
164 | flags |= H_COALESCE_CAND; | |
1da177e4 | 165 | |
b9377ffc | 166 | lpar_rc = plpar_pte_enter(flags, hpte_group, hpte_v, hpte_r, &slot); |
706c8c93 | 167 | if (unlikely(lpar_rc == H_PTEG_FULL)) { |
3c726f8d | 168 | if (!(vflags & HPTE_V_BOLTED)) |
551a232c | 169 | pr_devel(" full\n"); |
1da177e4 | 170 | return -1; |
3c726f8d | 171 | } |
1da177e4 LT |
172 | |
173 | /* | |
174 | * Since we try and ioremap PHBs we don't own, the pte insert | |
175 | * will fail. However we must catch the failure in hash_page | |
176 | * or we will loop forever, so return -2 in this case. | |
177 | */ | |
706c8c93 | 178 | if (unlikely(lpar_rc != H_SUCCESS)) { |
3c726f8d | 179 | if (!(vflags & HPTE_V_BOLTED)) |
4b8f63d9 | 180 | pr_devel(" lpar err %ld\n", lpar_rc); |
1da177e4 | 181 | return -2; |
3c726f8d BH |
182 | } |
183 | if (!(vflags & HPTE_V_BOLTED)) | |
551a232c | 184 | pr_devel(" -> slot: %lu\n", slot & 7); |
1da177e4 LT |
185 | |
186 | /* Because of iSeries, we have to pass down the secondary | |
187 | * bucket bit here as well | |
188 | */ | |
96e28449 | 189 | return (slot & 7) | (!!(vflags & HPTE_V_SECONDARY) << 3); |
1da177e4 LT |
190 | } |
191 | ||
192 | static DEFINE_SPINLOCK(pSeries_lpar_tlbie_lock); | |
193 | ||
194 | static long pSeries_lpar_hpte_remove(unsigned long hpte_group) | |
195 | { | |
196 | unsigned long slot_offset; | |
197 | unsigned long lpar_rc; | |
198 | int i; | |
199 | unsigned long dummy1, dummy2; | |
200 | ||
201 | /* pick a random slot to start at */ | |
202 | slot_offset = mftb() & 0x7; | |
203 | ||
204 | for (i = 0; i < HPTES_PER_GROUP; i++) { | |
205 | ||
206 | /* don't remove a bolted entry */ | |
207 | lpar_rc = plpar_pte_remove(H_ANDCOND, hpte_group + slot_offset, | |
208 | (0x1UL << 4), &dummy1, &dummy2); | |
706c8c93 | 209 | if (lpar_rc == H_SUCCESS) |
1da177e4 | 210 | return i; |
9fb26401 MW |
211 | |
212 | /* | |
213 | * The test for adjunct partition is performed before the | |
214 | * ANDCOND test. H_RESOURCE may be returned, so we need to | |
215 | * check for that as well. | |
216 | */ | |
217 | BUG_ON(lpar_rc != H_NOT_FOUND && lpar_rc != H_RESOURCE); | |
1da177e4 LT |
218 | |
219 | slot_offset++; | |
220 | slot_offset &= 0x7; | |
221 | } | |
222 | ||
223 | return -1; | |
224 | } | |
225 | ||
5246adec | 226 | static void manual_hpte_clear_all(void) |
1da177e4 LT |
227 | { |
228 | unsigned long size_bytes = 1UL << ppc64_pft_size; | |
229 | unsigned long hpte_count = size_bytes >> 4; | |
d504bed6 MN |
230 | struct { |
231 | unsigned long pteh; | |
232 | unsigned long ptel; | |
233 | } ptes[4]; | |
b7abc5c5 | 234 | long lpar_rc; |
bed9a315 | 235 | unsigned long i, j; |
d504bed6 MN |
236 | |
237 | /* Read in batches of 4, | |
238 | * invalidate only valid entries not in the VRMA | |
239 | * hpte_count will be a multiple of 4 | |
240 | */ | |
241 | for (i = 0; i < hpte_count; i += 4) { | |
242 | lpar_rc = plpar_pte_read_4_raw(0, i, (void *)ptes); | |
243 | if (lpar_rc != H_SUCCESS) | |
244 | continue; | |
245 | for (j = 0; j < 4; j++){ | |
246 | if ((ptes[j].pteh & HPTE_V_VRMA_MASK) == | |
247 | HPTE_V_VRMA_MASK) | |
248 | continue; | |
249 | if (ptes[j].pteh & HPTE_V_VALID) | |
250 | plpar_pte_remove_raw(0, i + j, 0, | |
251 | &(ptes[j].pteh), &(ptes[j].ptel)); | |
b7abc5c5 SS |
252 | } |
253 | } | |
5246adec AB |
254 | } |
255 | ||
256 | static int hcall_hpte_clear_all(void) | |
257 | { | |
258 | int rc; | |
259 | ||
260 | do { | |
261 | rc = plpar_hcall_norets(H_CLEAR_HPT); | |
262 | } while (rc == H_CONTINUE); | |
263 | ||
264 | return rc; | |
265 | } | |
266 | ||
267 | static void pseries_hpte_clear_all(void) | |
268 | { | |
269 | int rc; | |
270 | ||
271 | rc = hcall_hpte_clear_all(); | |
272 | if (rc != H_SUCCESS) | |
273 | manual_hpte_clear_all(); | |
e844b1ee AB |
274 | |
275 | #ifdef __LITTLE_ENDIAN__ | |
408cddd9 HB |
276 | /* |
277 | * Reset exceptions to big endian. | |
278 | * | |
279 | * FIXME this is a hack for kexec, we need to reset the exception | |
280 | * endian before starting the new kernel and this is a convenient place | |
281 | * to do it. | |
282 | * | |
283 | * This is also called on boot when a fadump happens. In that case we | |
284 | * must not change the exception endian mode. | |
285 | */ | |
d3cbff1b BH |
286 | if (firmware_has_feature(FW_FEATURE_SET_MODE) && !is_fadump_active()) |
287 | pseries_big_endian_exceptions(); | |
e844b1ee | 288 | #endif |
1da177e4 LT |
289 | } |
290 | ||
291 | /* | |
292 | * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and | |
293 | * the low 3 bits of flags happen to line up. So no transform is needed. | |
294 | * We can probably optimize here and assume the high bits of newpp are | |
295 | * already zero. For now I am paranoid. | |
296 | */ | |
3c726f8d BH |
297 | static long pSeries_lpar_hpte_updatepp(unsigned long slot, |
298 | unsigned long newpp, | |
5524a27d | 299 | unsigned long vpn, |
db3d8534 | 300 | int psize, int apsize, |
aefa5688 | 301 | int ssize, unsigned long inv_flags) |
1da177e4 LT |
302 | { |
303 | unsigned long lpar_rc; | |
304 | unsigned long flags = (newpp & 7) | H_AVPN; | |
3c726f8d | 305 | unsigned long want_v; |
1da177e4 | 306 | |
5524a27d | 307 | want_v = hpte_encode_avpn(vpn, psize, ssize); |
1da177e4 | 308 | |
551a232c | 309 | pr_devel(" update: avpnv=%016lx, hash=%016lx, f=%lx, psize: %d ...", |
f7ebf352 | 310 | want_v, slot, flags, psize); |
1da177e4 | 311 | |
1189be65 | 312 | lpar_rc = plpar_pte_protect(flags, slot, want_v); |
3c726f8d | 313 | |
706c8c93 | 314 | if (lpar_rc == H_NOT_FOUND) { |
551a232c | 315 | pr_devel("not found !\n"); |
1da177e4 | 316 | return -1; |
3c726f8d BH |
317 | } |
318 | ||
551a232c | 319 | pr_devel("ok\n"); |
1da177e4 | 320 | |
706c8c93 | 321 | BUG_ON(lpar_rc != H_SUCCESS); |
1da177e4 LT |
322 | |
323 | return 0; | |
324 | } | |
325 | ||
4ad90c86 | 326 | static long __pSeries_lpar_hpte_find(unsigned long want_v, unsigned long hpte_group) |
1da177e4 | 327 | { |
4ad90c86 AK |
328 | long lpar_rc; |
329 | unsigned long i, j; | |
330 | struct { | |
331 | unsigned long pteh; | |
332 | unsigned long ptel; | |
333 | } ptes[4]; | |
1da177e4 | 334 | |
4ad90c86 | 335 | for (i = 0; i < HPTES_PER_GROUP; i += 4, hpte_group += 4) { |
1da177e4 | 336 | |
4ad90c86 AK |
337 | lpar_rc = plpar_pte_read_4(0, hpte_group, (void *)ptes); |
338 | if (lpar_rc != H_SUCCESS) | |
339 | continue; | |
1da177e4 | 340 | |
4ad90c86 AK |
341 | for (j = 0; j < 4; j++) { |
342 | if (HPTE_V_COMPARE(ptes[j].pteh, want_v) && | |
343 | (ptes[j].pteh & HPTE_V_VALID)) | |
344 | return i + j; | |
345 | } | |
346 | } | |
1da177e4 | 347 | |
4ad90c86 | 348 | return -1; |
1da177e4 LT |
349 | } |
350 | ||
5524a27d | 351 | static long pSeries_lpar_hpte_find(unsigned long vpn, int psize, int ssize) |
1da177e4 | 352 | { |
1da177e4 | 353 | long slot; |
4ad90c86 AK |
354 | unsigned long hash; |
355 | unsigned long want_v; | |
356 | unsigned long hpte_group; | |
1da177e4 | 357 | |
5524a27d AK |
358 | hash = hpt_hash(vpn, mmu_psize_defs[psize].shift, ssize); |
359 | want_v = hpte_encode_avpn(vpn, psize, ssize); | |
1189be65 PM |
360 | |
361 | /* Bolted entries are always in the primary group */ | |
4ad90c86 AK |
362 | hpte_group = (hash & htab_hash_mask) * HPTES_PER_GROUP; |
363 | slot = __pSeries_lpar_hpte_find(want_v, hpte_group); | |
364 | if (slot < 0) | |
365 | return -1; | |
366 | return hpte_group + slot; | |
367 | } | |
1da177e4 LT |
368 | |
369 | static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp, | |
3c726f8d | 370 | unsigned long ea, |
1189be65 | 371 | int psize, int ssize) |
1da177e4 | 372 | { |
5524a27d AK |
373 | unsigned long vpn; |
374 | unsigned long lpar_rc, slot, vsid, flags; | |
1da177e4 | 375 | |
1189be65 | 376 | vsid = get_kernel_vsid(ea, ssize); |
5524a27d | 377 | vpn = hpt_vpn(ea, vsid, ssize); |
1da177e4 | 378 | |
5524a27d | 379 | slot = pSeries_lpar_hpte_find(vpn, psize, ssize); |
1da177e4 LT |
380 | BUG_ON(slot == -1); |
381 | ||
382 | flags = newpp & 7; | |
383 | lpar_rc = plpar_pte_protect(flags, slot, 0); | |
384 | ||
706c8c93 | 385 | BUG_ON(lpar_rc != H_SUCCESS); |
1da177e4 LT |
386 | } |
387 | ||
5524a27d | 388 | static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long vpn, |
db3d8534 AK |
389 | int psize, int apsize, |
390 | int ssize, int local) | |
1da177e4 | 391 | { |
3c726f8d | 392 | unsigned long want_v; |
1da177e4 LT |
393 | unsigned long lpar_rc; |
394 | unsigned long dummy1, dummy2; | |
395 | ||
5524a27d AK |
396 | pr_devel(" inval : slot=%lx, vpn=%016lx, psize: %d, local: %d\n", |
397 | slot, vpn, psize, local); | |
1da177e4 | 398 | |
5524a27d | 399 | want_v = hpte_encode_avpn(vpn, psize, ssize); |
1189be65 | 400 | lpar_rc = plpar_pte_remove(H_AVPN, slot, want_v, &dummy1, &dummy2); |
706c8c93 | 401 | if (lpar_rc == H_NOT_FOUND) |
1da177e4 LT |
402 | return; |
403 | ||
706c8c93 | 404 | BUG_ON(lpar_rc != H_SUCCESS); |
1da177e4 LT |
405 | } |
406 | ||
e34aa03c | 407 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
1a527286 AK |
408 | /* |
409 | * Limit iterations holding pSeries_lpar_tlbie_lock to 3. We also need | |
410 | * to make sure that we avoid bouncing the hypervisor tlbie lock. | |
411 | */ | |
412 | #define PPC64_HUGE_HPTE_BATCH 12 | |
413 | ||
414 | static void __pSeries_lpar_hugepage_invalidate(unsigned long *slot, | |
415 | unsigned long *vpn, int count, | |
416 | int psize, int ssize) | |
417 | { | |
05af40e8 | 418 | unsigned long param[PLPAR_HCALL9_BUFSIZE]; |
1a527286 AK |
419 | int i = 0, pix = 0, rc; |
420 | unsigned long flags = 0; | |
421 | int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE); | |
422 | ||
423 | if (lock_tlbie) | |
424 | spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags); | |
425 | ||
426 | for (i = 0; i < count; i++) { | |
427 | ||
428 | if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) { | |
429 | pSeries_lpar_hpte_invalidate(slot[i], vpn[i], psize, 0, | |
430 | ssize, 0); | |
431 | } else { | |
432 | param[pix] = HBR_REQUEST | HBR_AVPN | slot[i]; | |
433 | param[pix+1] = hpte_encode_avpn(vpn[i], psize, ssize); | |
434 | pix += 2; | |
435 | if (pix == 8) { | |
436 | rc = plpar_hcall9(H_BULK_REMOVE, param, | |
437 | param[0], param[1], param[2], | |
438 | param[3], param[4], param[5], | |
439 | param[6], param[7]); | |
440 | BUG_ON(rc != H_SUCCESS); | |
441 | pix = 0; | |
442 | } | |
443 | } | |
444 | } | |
445 | if (pix) { | |
446 | param[pix] = HBR_END; | |
447 | rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1], | |
448 | param[2], param[3], param[4], param[5], | |
449 | param[6], param[7]); | |
450 | BUG_ON(rc != H_SUCCESS); | |
451 | } | |
452 | ||
453 | if (lock_tlbie) | |
454 | spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags); | |
455 | } | |
456 | ||
fa1f8ae8 AK |
457 | static void pSeries_lpar_hugepage_invalidate(unsigned long vsid, |
458 | unsigned long addr, | |
459 | unsigned char *hpte_slot_array, | |
d557b098 | 460 | int psize, int ssize, int local) |
1a527286 | 461 | { |
fa1f8ae8 | 462 | int i, index = 0; |
1a527286 AK |
463 | unsigned long s_addr = addr; |
464 | unsigned int max_hpte_count, valid; | |
465 | unsigned long vpn_array[PPC64_HUGE_HPTE_BATCH]; | |
466 | unsigned long slot_array[PPC64_HUGE_HPTE_BATCH]; | |
fa1f8ae8 | 467 | unsigned long shift, hidx, vpn = 0, hash, slot; |
1a527286 AK |
468 | |
469 | shift = mmu_psize_defs[psize].shift; | |
470 | max_hpte_count = 1U << (PMD_SHIFT - shift); | |
471 | ||
472 | for (i = 0; i < max_hpte_count; i++) { | |
473 | valid = hpte_valid(hpte_slot_array, i); | |
474 | if (!valid) | |
475 | continue; | |
476 | hidx = hpte_hash_index(hpte_slot_array, i); | |
477 | ||
478 | /* get the vpn */ | |
479 | addr = s_addr + (i * (1ul << shift)); | |
1a527286 AK |
480 | vpn = hpt_vpn(addr, vsid, ssize); |
481 | hash = hpt_hash(vpn, shift, ssize); | |
482 | if (hidx & _PTEIDX_SECONDARY) | |
483 | hash = ~hash; | |
484 | ||
485 | slot = (hash & htab_hash_mask) * HPTES_PER_GROUP; | |
486 | slot += hidx & _PTEIDX_GROUP_IX; | |
487 | ||
488 | slot_array[index] = slot; | |
489 | vpn_array[index] = vpn; | |
490 | if (index == PPC64_HUGE_HPTE_BATCH - 1) { | |
491 | /* | |
492 | * Now do a bluk invalidate | |
493 | */ | |
494 | __pSeries_lpar_hugepage_invalidate(slot_array, | |
495 | vpn_array, | |
496 | PPC64_HUGE_HPTE_BATCH, | |
497 | psize, ssize); | |
498 | index = 0; | |
499 | } else | |
500 | index++; | |
501 | } | |
502 | if (index) | |
503 | __pSeries_lpar_hugepage_invalidate(slot_array, vpn_array, | |
504 | index, psize, ssize); | |
505 | } | |
e34aa03c AK |
506 | #else |
507 | static void pSeries_lpar_hugepage_invalidate(unsigned long vsid, | |
508 | unsigned long addr, | |
509 | unsigned char *hpte_slot_array, | |
510 | int psize, int ssize, int local) | |
511 | { | |
512 | WARN(1, "%s called without THP support\n", __func__); | |
513 | } | |
514 | #endif | |
1a527286 | 515 | |
27828f98 DG |
516 | static int pSeries_lpar_hpte_removebolted(unsigned long ea, |
517 | int psize, int ssize) | |
f8c8803b | 518 | { |
5524a27d AK |
519 | unsigned long vpn; |
520 | unsigned long slot, vsid; | |
f8c8803b BP |
521 | |
522 | vsid = get_kernel_vsid(ea, ssize); | |
5524a27d | 523 | vpn = hpt_vpn(ea, vsid, ssize); |
f8c8803b | 524 | |
5524a27d | 525 | slot = pSeries_lpar_hpte_find(vpn, psize, ssize); |
27828f98 DG |
526 | if (slot == -1) |
527 | return -ENOENT; | |
528 | ||
db3d8534 AK |
529 | /* |
530 | * lpar doesn't use the passed actual page size | |
531 | */ | |
532 | pSeries_lpar_hpte_invalidate(slot, vpn, psize, 0, ssize, 0); | |
27828f98 | 533 | return 0; |
f8c8803b BP |
534 | } |
535 | ||
1da177e4 LT |
536 | /* |
537 | * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie | |
538 | * lock. | |
539 | */ | |
035223fb | 540 | static void pSeries_lpar_flush_hash_range(unsigned long number, int local) |
1da177e4 | 541 | { |
5524a27d | 542 | unsigned long vpn; |
f03e64f2 | 543 | unsigned long i, pix, rc; |
12e86f92 | 544 | unsigned long flags = 0; |
69111bac | 545 | struct ppc64_tlb_batch *batch = this_cpu_ptr(&ppc64_tlb_batch); |
44ae3ab3 | 546 | int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE); |
05af40e8 | 547 | unsigned long param[PLPAR_HCALL9_BUFSIZE]; |
f03e64f2 PM |
548 | unsigned long hash, index, shift, hidx, slot; |
549 | real_pte_t pte; | |
1189be65 | 550 | int psize, ssize; |
1da177e4 LT |
551 | |
552 | if (lock_tlbie) | |
553 | spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags); | |
554 | ||
f03e64f2 | 555 | psize = batch->psize; |
1189be65 | 556 | ssize = batch->ssize; |
f03e64f2 PM |
557 | pix = 0; |
558 | for (i = 0; i < number; i++) { | |
5524a27d | 559 | vpn = batch->vpn[i]; |
f03e64f2 | 560 | pte = batch->pte[i]; |
5524a27d AK |
561 | pte_iterate_hashed_subpages(pte, psize, vpn, index, shift) { |
562 | hash = hpt_hash(vpn, shift, ssize); | |
f03e64f2 PM |
563 | hidx = __rpte_to_hidx(pte, index); |
564 | if (hidx & _PTEIDX_SECONDARY) | |
565 | hash = ~hash; | |
566 | slot = (hash & htab_hash_mask) * HPTES_PER_GROUP; | |
567 | slot += hidx & _PTEIDX_GROUP_IX; | |
12e86f92 | 568 | if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) { |
db3d8534 AK |
569 | /* |
570 | * lpar doesn't use the passed actual page size | |
571 | */ | |
5524a27d | 572 | pSeries_lpar_hpte_invalidate(slot, vpn, psize, |
db3d8534 | 573 | 0, ssize, local); |
12e86f92 PM |
574 | } else { |
575 | param[pix] = HBR_REQUEST | HBR_AVPN | slot; | |
5524a27d | 576 | param[pix+1] = hpte_encode_avpn(vpn, psize, |
1189be65 | 577 | ssize); |
12e86f92 PM |
578 | pix += 2; |
579 | if (pix == 8) { | |
580 | rc = plpar_hcall9(H_BULK_REMOVE, param, | |
f03e64f2 PM |
581 | param[0], param[1], param[2], |
582 | param[3], param[4], param[5], | |
583 | param[6], param[7]); | |
12e86f92 PM |
584 | BUG_ON(rc != H_SUCCESS); |
585 | pix = 0; | |
586 | } | |
f03e64f2 PM |
587 | } |
588 | } pte_iterate_hashed_end(); | |
589 | } | |
590 | if (pix) { | |
591 | param[pix] = HBR_END; | |
592 | rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1], | |
593 | param[2], param[3], param[4], param[5], | |
594 | param[6], param[7]); | |
595 | BUG_ON(rc != H_SUCCESS); | |
596 | } | |
1da177e4 LT |
597 | |
598 | if (lock_tlbie) | |
599 | spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags); | |
600 | } | |
601 | ||
4e89a2d8 WS |
602 | static int __init disable_bulk_remove(char *str) |
603 | { | |
604 | if (strcmp(str, "off") == 0 && | |
605 | firmware_has_feature(FW_FEATURE_BULK_REMOVE)) { | |
606 | printk(KERN_INFO "Disabling BULK_REMOVE firmware feature"); | |
607 | powerpc_firmware_features &= ~FW_FEATURE_BULK_REMOVE; | |
608 | } | |
609 | return 1; | |
610 | } | |
611 | ||
612 | __setup("bulk_remove=", disable_bulk_remove); | |
613 | ||
dbcf929c DG |
614 | #define HPT_RESIZE_TIMEOUT 10000 /* ms */ |
615 | ||
616 | struct hpt_resize_state { | |
617 | unsigned long shift; | |
618 | int commit_rc; | |
619 | }; | |
620 | ||
621 | static int pseries_lpar_resize_hpt_commit(void *data) | |
622 | { | |
623 | struct hpt_resize_state *state = data; | |
624 | ||
625 | state->commit_rc = plpar_resize_hpt_commit(0, state->shift); | |
626 | if (state->commit_rc != H_SUCCESS) | |
627 | return -EIO; | |
628 | ||
629 | /* Hypervisor has transitioned the HTAB, update our globals */ | |
630 | ppc64_pft_size = state->shift; | |
631 | htab_size_bytes = 1UL << ppc64_pft_size; | |
632 | htab_hash_mask = (htab_size_bytes >> 7) - 1; | |
633 | ||
634 | return 0; | |
635 | } | |
636 | ||
637 | /* Must be called in user context */ | |
638 | static int pseries_lpar_resize_hpt(unsigned long shift) | |
639 | { | |
640 | struct hpt_resize_state state = { | |
641 | .shift = shift, | |
642 | .commit_rc = H_FUNCTION, | |
643 | }; | |
644 | unsigned int delay, total_delay = 0; | |
645 | int rc; | |
646 | ktime_t t0, t1, t2; | |
647 | ||
648 | might_sleep(); | |
649 | ||
650 | if (!firmware_has_feature(FW_FEATURE_HPT_RESIZE)) | |
651 | return -ENODEV; | |
652 | ||
653 | printk(KERN_INFO "lpar: Attempting to resize HPT to shift %lu\n", | |
654 | shift); | |
655 | ||
656 | t0 = ktime_get(); | |
657 | ||
658 | rc = plpar_resize_hpt_prepare(0, shift); | |
659 | while (H_IS_LONG_BUSY(rc)) { | |
660 | delay = get_longbusy_msecs(rc); | |
661 | total_delay += delay; | |
662 | if (total_delay > HPT_RESIZE_TIMEOUT) { | |
663 | /* prepare with shift==0 cancels an in-progress resize */ | |
664 | rc = plpar_resize_hpt_prepare(0, 0); | |
665 | if (rc != H_SUCCESS) | |
666 | printk(KERN_WARNING | |
667 | "lpar: Unexpected error %d cancelling timed out HPT resize\n", | |
668 | rc); | |
669 | return -ETIMEDOUT; | |
670 | } | |
671 | msleep(delay); | |
672 | rc = plpar_resize_hpt_prepare(0, shift); | |
673 | }; | |
674 | ||
675 | switch (rc) { | |
676 | case H_SUCCESS: | |
677 | /* Continue on */ | |
678 | break; | |
679 | ||
680 | case H_PARAMETER: | |
681 | return -EINVAL; | |
682 | case H_RESOURCE: | |
683 | return -EPERM; | |
684 | default: | |
685 | printk(KERN_WARNING | |
686 | "lpar: Unexpected error %d from H_RESIZE_HPT_PREPARE\n", | |
687 | rc); | |
688 | return -EIO; | |
689 | } | |
690 | ||
691 | t1 = ktime_get(); | |
692 | ||
693 | rc = stop_machine(pseries_lpar_resize_hpt_commit, &state, NULL); | |
694 | ||
695 | t2 = ktime_get(); | |
696 | ||
697 | if (rc != 0) { | |
698 | switch (state.commit_rc) { | |
699 | case H_PTEG_FULL: | |
700 | printk(KERN_WARNING | |
701 | "lpar: Hash collision while resizing HPT\n"); | |
702 | return -ENOSPC; | |
703 | ||
704 | default: | |
705 | printk(KERN_WARNING | |
706 | "lpar: Unexpected error %d from H_RESIZE_HPT_COMMIT\n", | |
707 | state.commit_rc); | |
708 | return -EIO; | |
709 | }; | |
710 | } | |
711 | ||
712 | printk(KERN_INFO | |
713 | "lpar: HPT resize to shift %lu complete (%lld ms / %lld ms)\n", | |
714 | shift, (long long) ktime_ms_delta(t1, t0), | |
715 | (long long) ktime_ms_delta(t2, t1)); | |
716 | ||
717 | return 0; | |
718 | } | |
719 | ||
cc3d2940 PM |
720 | /* Actually only used for radix, so far */ |
721 | static int pseries_lpar_register_process_table(unsigned long base, | |
722 | unsigned long page_size, unsigned long table_size) | |
723 | { | |
724 | long rc; | |
725 | unsigned long flags = PROC_TABLE_NEW; | |
726 | ||
727 | if (radix_enabled()) | |
728 | flags |= PROC_TABLE_RADIX | PROC_TABLE_GTSE; | |
729 | for (;;) { | |
730 | rc = plpar_hcall_norets(H_REGISTER_PROC_TBL, flags, base, | |
731 | page_size, table_size); | |
732 | if (!H_IS_LONG_BUSY(rc)) | |
733 | break; | |
734 | mdelay(get_longbusy_msecs(rc)); | |
735 | } | |
736 | if (rc != H_SUCCESS) { | |
737 | pr_err("Failed to register process table (rc=%ld)\n", rc); | |
738 | BUG(); | |
739 | } | |
740 | return rc; | |
741 | } | |
742 | ||
6364e84e | 743 | void __init hpte_init_pseries(void) |
1da177e4 | 744 | { |
7025776e BH |
745 | mmu_hash_ops.hpte_invalidate = pSeries_lpar_hpte_invalidate; |
746 | mmu_hash_ops.hpte_updatepp = pSeries_lpar_hpte_updatepp; | |
747 | mmu_hash_ops.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp; | |
748 | mmu_hash_ops.hpte_insert = pSeries_lpar_hpte_insert; | |
749 | mmu_hash_ops.hpte_remove = pSeries_lpar_hpte_remove; | |
750 | mmu_hash_ops.hpte_removebolted = pSeries_lpar_hpte_removebolted; | |
751 | mmu_hash_ops.flush_hash_range = pSeries_lpar_flush_hash_range; | |
5246adec | 752 | mmu_hash_ops.hpte_clear_all = pseries_hpte_clear_all; |
7025776e | 753 | mmu_hash_ops.hugepage_invalidate = pSeries_lpar_hugepage_invalidate; |
8971e1c7 ME |
754 | |
755 | if (firmware_has_feature(FW_FEATURE_HPT_RESIZE)) | |
756 | mmu_hash_ops.resize_hpt = pseries_lpar_resize_hpt; | |
1da177e4 | 757 | } |
14f966e7 | 758 | |
cc3d2940 PM |
759 | void radix_init_pseries(void) |
760 | { | |
761 | pr_info("Using radix MMU under hypervisor\n"); | |
762 | register_process_table = pseries_lpar_register_process_table; | |
763 | } | |
764 | ||
14f966e7 RJ |
765 | #ifdef CONFIG_PPC_SMLPAR |
766 | #define CMO_FREE_HINT_DEFAULT 1 | |
767 | static int cmo_free_hint_flag = CMO_FREE_HINT_DEFAULT; | |
768 | ||
769 | static int __init cmo_free_hint(char *str) | |
770 | { | |
771 | char *parm; | |
772 | parm = strstrip(str); | |
773 | ||
774 | if (strcasecmp(parm, "no") == 0 || strcasecmp(parm, "off") == 0) { | |
775 | printk(KERN_INFO "cmo_free_hint: CMO free page hinting is not active.\n"); | |
776 | cmo_free_hint_flag = 0; | |
777 | return 1; | |
778 | } | |
779 | ||
780 | cmo_free_hint_flag = 1; | |
781 | printk(KERN_INFO "cmo_free_hint: CMO free page hinting is active.\n"); | |
782 | ||
783 | if (strcasecmp(parm, "yes") == 0 || strcasecmp(parm, "on") == 0) | |
784 | return 1; | |
785 | ||
786 | return 0; | |
787 | } | |
788 | ||
789 | __setup("cmo_free_hint=", cmo_free_hint); | |
790 | ||
791 | static void pSeries_set_page_state(struct page *page, int order, | |
792 | unsigned long state) | |
793 | { | |
794 | int i, j; | |
795 | unsigned long cmo_page_sz, addr; | |
796 | ||
797 | cmo_page_sz = cmo_get_page_size(); | |
798 | addr = __pa((unsigned long)page_address(page)); | |
799 | ||
800 | for (i = 0; i < (1 << order); i++, addr += PAGE_SIZE) { | |
801 | for (j = 0; j < PAGE_SIZE; j += cmo_page_sz) | |
802 | plpar_hcall_norets(H_PAGE_INIT, state, addr + j, 0); | |
803 | } | |
804 | } | |
805 | ||
806 | void arch_free_page(struct page *page, int order) | |
807 | { | |
d8c476ee AK |
808 | if (radix_enabled()) |
809 | return; | |
14f966e7 RJ |
810 | if (!cmo_free_hint_flag || !firmware_has_feature(FW_FEATURE_CMO)) |
811 | return; | |
812 | ||
813 | pSeries_set_page_state(page, order, H_PAGE_SET_UNUSED); | |
814 | } | |
815 | EXPORT_SYMBOL(arch_free_page); | |
816 | ||
d8c476ee AK |
817 | #endif /* CONFIG_PPC_SMLPAR */ |
818 | #endif /* CONFIG_PPC_STD_MMU_64 */ | |
c8cd093a AB |
819 | |
820 | #ifdef CONFIG_TRACEPOINTS | |
d4fe0965 | 821 | #ifdef HAVE_JUMP_LABEL |
cc1adb5f AB |
822 | struct static_key hcall_tracepoint_key = STATIC_KEY_INIT; |
823 | ||
8cf868af | 824 | int hcall_tracepoint_regfunc(void) |
cc1adb5f AB |
825 | { |
826 | static_key_slow_inc(&hcall_tracepoint_key); | |
8cf868af | 827 | return 0; |
cc1adb5f AB |
828 | } |
829 | ||
830 | void hcall_tracepoint_unregfunc(void) | |
831 | { | |
832 | static_key_slow_dec(&hcall_tracepoint_key); | |
833 | } | |
834 | #else | |
c8cd093a AB |
835 | /* |
836 | * We optimise our hcall path by placing hcall_tracepoint_refcount | |
837 | * directly in the TOC so we can check if the hcall tracepoints are | |
838 | * enabled via a single load. | |
839 | */ | |
840 | ||
841 | /* NB: reg/unreg are called while guarded with the tracepoints_mutex */ | |
842 | extern long hcall_tracepoint_refcount; | |
843 | ||
8cf868af | 844 | int hcall_tracepoint_regfunc(void) |
c8cd093a AB |
845 | { |
846 | hcall_tracepoint_refcount++; | |
8cf868af | 847 | return 0; |
c8cd093a AB |
848 | } |
849 | ||
850 | void hcall_tracepoint_unregfunc(void) | |
851 | { | |
852 | hcall_tracepoint_refcount--; | |
853 | } | |
cc1adb5f AB |
854 | #endif |
855 | ||
856 | /* | |
857 | * Since the tracing code might execute hcalls we need to guard against | |
858 | * recursion. One example of this are spinlocks calling H_YIELD on | |
859 | * shared processor partitions. | |
860 | */ | |
861 | static DEFINE_PER_CPU(unsigned int, hcall_trace_depth); | |
862 | ||
c8cd093a | 863 | |
6f26353c | 864 | void __trace_hcall_entry(unsigned long opcode, unsigned long *args) |
c8cd093a | 865 | { |
57cdfdf8 AB |
866 | unsigned long flags; |
867 | unsigned int *depth; | |
868 | ||
a5ccfee0 AB |
869 | /* |
870 | * We cannot call tracepoints inside RCU idle regions which | |
871 | * means we must not trace H_CEDE. | |
872 | */ | |
873 | if (opcode == H_CEDE) | |
874 | return; | |
875 | ||
57cdfdf8 AB |
876 | local_irq_save(flags); |
877 | ||
69111bac | 878 | depth = this_cpu_ptr(&hcall_trace_depth); |
57cdfdf8 AB |
879 | |
880 | if (*depth) | |
881 | goto out; | |
882 | ||
883 | (*depth)++; | |
e4f387d8 | 884 | preempt_disable(); |
6f26353c | 885 | trace_hcall_entry(opcode, args); |
57cdfdf8 AB |
886 | (*depth)--; |
887 | ||
888 | out: | |
889 | local_irq_restore(flags); | |
c8cd093a AB |
890 | } |
891 | ||
6f26353c AB |
892 | void __trace_hcall_exit(long opcode, unsigned long retval, |
893 | unsigned long *retbuf) | |
c8cd093a | 894 | { |
57cdfdf8 AB |
895 | unsigned long flags; |
896 | unsigned int *depth; | |
897 | ||
a5ccfee0 AB |
898 | if (opcode == H_CEDE) |
899 | return; | |
900 | ||
57cdfdf8 AB |
901 | local_irq_save(flags); |
902 | ||
69111bac | 903 | depth = this_cpu_ptr(&hcall_trace_depth); |
57cdfdf8 AB |
904 | |
905 | if (*depth) | |
906 | goto out; | |
907 | ||
908 | (*depth)++; | |
6f26353c | 909 | trace_hcall_exit(opcode, retval, retbuf); |
e4f387d8 | 910 | preempt_enable(); |
57cdfdf8 AB |
911 | (*depth)--; |
912 | ||
913 | out: | |
914 | local_irq_restore(flags); | |
c8cd093a AB |
915 | } |
916 | #endif | |
9ee820fa BK |
917 | |
918 | /** | |
919 | * h_get_mpp | |
920 | * H_GET_MPP hcall returns info in 7 parms | |
921 | */ | |
922 | int h_get_mpp(struct hvcall_mpp_data *mpp_data) | |
923 | { | |
924 | int rc; | |
925 | unsigned long retbuf[PLPAR_HCALL9_BUFSIZE]; | |
926 | ||
927 | rc = plpar_hcall9(H_GET_MPP, retbuf); | |
928 | ||
929 | mpp_data->entitled_mem = retbuf[0]; | |
930 | mpp_data->mapped_mem = retbuf[1]; | |
931 | ||
932 | mpp_data->group_num = (retbuf[2] >> 2 * 8) & 0xffff; | |
933 | mpp_data->pool_num = retbuf[2] & 0xffff; | |
934 | ||
935 | mpp_data->mem_weight = (retbuf[3] >> 7 * 8) & 0xff; | |
936 | mpp_data->unallocated_mem_weight = (retbuf[3] >> 6 * 8) & 0xff; | |
b0d436c7 | 937 | mpp_data->unallocated_entitlement = retbuf[3] & 0xffffffffffffUL; |
9ee820fa BK |
938 | |
939 | mpp_data->pool_size = retbuf[4]; | |
940 | mpp_data->loan_request = retbuf[5]; | |
941 | mpp_data->backing_mem = retbuf[6]; | |
942 | ||
943 | return rc; | |
944 | } | |
945 | EXPORT_SYMBOL(h_get_mpp); | |
946 | ||
947 | int h_get_mpp_x(struct hvcall_mpp_x_data *mpp_x_data) | |
948 | { | |
949 | int rc; | |
950 | unsigned long retbuf[PLPAR_HCALL9_BUFSIZE] = { 0 }; | |
951 | ||
952 | rc = plpar_hcall9(H_GET_MPP_X, retbuf); | |
953 | ||
954 | mpp_x_data->coalesced_bytes = retbuf[0]; | |
955 | mpp_x_data->pool_coalesced_bytes = retbuf[1]; | |
956 | mpp_x_data->pool_purr_cycles = retbuf[2]; | |
957 | mpp_x_data->pool_spurr_cycles = retbuf[3]; | |
958 | ||
959 | return rc; | |
960 | } | |
82228e36 AK |
961 | |
962 | static unsigned long vsid_unscramble(unsigned long vsid, int ssize) | |
963 | { | |
964 | unsigned long protovsid; | |
965 | unsigned long va_bits = VA_BITS; | |
966 | unsigned long modinv, vsid_modulus; | |
967 | unsigned long max_mod_inv, tmp_modinv; | |
968 | ||
969 | if (!mmu_has_feature(MMU_FTR_68_BIT_VA)) | |
970 | va_bits = 65; | |
971 | ||
972 | if (ssize == MMU_SEGSIZE_256M) { | |
973 | modinv = VSID_MULINV_256M; | |
974 | vsid_modulus = ((1UL << (va_bits - SID_SHIFT)) - 1); | |
975 | } else { | |
976 | modinv = VSID_MULINV_1T; | |
977 | vsid_modulus = ((1UL << (va_bits - SID_SHIFT_1T)) - 1); | |
978 | } | |
979 | ||
980 | /* | |
981 | * vsid outside our range. | |
982 | */ | |
983 | if (vsid >= vsid_modulus) | |
984 | return 0; | |
985 | ||
986 | /* | |
987 | * If modinv is the modular multiplicate inverse of (x % vsid_modulus) | |
988 | * and vsid = (protovsid * x) % vsid_modulus, then we say: | |
989 | * protovsid = (vsid * modinv) % vsid_modulus | |
990 | */ | |
991 | ||
992 | /* Check if (vsid * modinv) overflow (63 bits) */ | |
993 | max_mod_inv = 0x7fffffffffffffffull / vsid; | |
994 | if (modinv < max_mod_inv) | |
995 | return (vsid * modinv) % vsid_modulus; | |
996 | ||
997 | tmp_modinv = modinv/max_mod_inv; | |
998 | modinv %= max_mod_inv; | |
999 | ||
1000 | protovsid = (((vsid * max_mod_inv) % vsid_modulus) * tmp_modinv) % vsid_modulus; | |
1001 | protovsid = (protovsid + vsid * modinv) % vsid_modulus; | |
1002 | ||
1003 | return protovsid; | |
1004 | } | |
1005 | ||
1006 | static int __init reserve_vrma_context_id(void) | |
1007 | { | |
1008 | unsigned long protovsid; | |
1009 | ||
1010 | /* | |
1011 | * Reserve context ids which map to reserved virtual addresses. For now | |
1012 | * we only reserve the context id which maps to the VRMA VSID. We ignore | |
1013 | * the addresses in "ibm,adjunct-virtual-addresses" because we don't | |
1014 | * enable adjunct support via the "ibm,client-architecture-support" | |
1015 | * interface. | |
1016 | */ | |
1017 | protovsid = vsid_unscramble(VRMA_VSID, MMU_SEGSIZE_1T); | |
1018 | hash__reserve_context_id(protovsid >> ESID_BITS_1T); | |
1019 | return 0; | |
1020 | } | |
1021 | machine_device_initcall(pseries, reserve_vrma_context_id); |