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Commit | Line | Data |
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9b6b563c PM |
1 | /* |
2 | * Procedures for creating, accessing and interpreting the device tree. | |
3 | * | |
4 | * Paul Mackerras August 1996. | |
5 | * Copyright (C) 1996-2005 Paul Mackerras. | |
6 | * | |
7 | * Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner. | |
8 | * {engebret|bergner}@us.ibm.com | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public License | |
12 | * as published by the Free Software Foundation; either version | |
13 | * 2 of the License, or (at your option) any later version. | |
14 | */ | |
15 | ||
16 | #undef DEBUG | |
17 | ||
18 | #include <stdarg.h> | |
9b6b563c PM |
19 | #include <linux/kernel.h> |
20 | #include <linux/string.h> | |
21 | #include <linux/init.h> | |
22 | #include <linux/threads.h> | |
23 | #include <linux/spinlock.h> | |
24 | #include <linux/types.h> | |
25 | #include <linux/pci.h> | |
26 | #include <linux/stringify.h> | |
27 | #include <linux/delay.h> | |
28 | #include <linux/initrd.h> | |
29 | #include <linux/bitops.h> | |
4b16f8e2 | 30 | #include <linux/export.h> |
dcee3036 | 31 | #include <linux/kexec.h> |
0ebfff14 | 32 | #include <linux/irq.h> |
95f72d1e | 33 | #include <linux/memblock.h> |
1cf3d8b3 | 34 | #include <linux/of.h> |
708b7eef | 35 | #include <linux/of_fdt.h> |
060f78c2 | 36 | #include <linux/libfdt.h> |
9b6b563c PM |
37 | |
38 | #include <asm/prom.h> | |
39 | #include <asm/rtas.h> | |
9b6b563c PM |
40 | #include <asm/page.h> |
41 | #include <asm/processor.h> | |
42 | #include <asm/irq.h> | |
43 | #include <asm/io.h> | |
0cc4746c | 44 | #include <asm/kdump.h> |
9b6b563c | 45 | #include <asm/smp.h> |
9b6b563c | 46 | #include <asm/mmu.h> |
1426d5a3 | 47 | #include <asm/paca.h> |
9b6b563c | 48 | #include <asm/pgtable.h> |
9b6b563c PM |
49 | #include <asm/iommu.h> |
50 | #include <asm/btext.h> | |
51 | #include <asm/sections.h> | |
52 | #include <asm/machdep.h> | |
40ef8cbc | 53 | #include <asm/pci-bridge.h> |
2babf5c2 | 54 | #include <asm/kexec.h> |
14a43e69 | 55 | #include <asm/opal.h> |
eb39c880 | 56 | #include <asm/fadump.h> |
0dc3289c | 57 | #include <asm/debug.h> |
14a43e69 | 58 | |
37dd2bad | 59 | #include <mm/mmu_decl.h> |
9b6b563c PM |
60 | |
61 | #ifdef DEBUG | |
62 | #define DBG(fmt...) printk(KERN_ERR fmt) | |
63 | #else | |
64 | #define DBG(fmt...) | |
65 | #endif | |
66 | ||
9b6b563c | 67 | #ifdef CONFIG_PPC64 |
28897731 | 68 | int __initdata iommu_is_off; |
9b6b563c | 69 | int __initdata iommu_force_on; |
cf00a8d1 | 70 | unsigned long tce_alloc_start, tce_alloc_end; |
cd3db0c4 | 71 | u64 ppc64_rma_size; |
9b6b563c | 72 | #endif |
03bf469a | 73 | static phys_addr_t first_memblock_size; |
7ac87abb | 74 | static int __initdata boot_cpu_count; |
9b6b563c | 75 | |
2babf5c2 ME |
76 | static int __init early_parse_mem(char *p) |
77 | { | |
78 | if (!p) | |
79 | return 1; | |
80 | ||
81 | memory_limit = PAGE_ALIGN(memparse(p, &p)); | |
a84fcd46 | 82 | DBG("memory limit = 0x%llx\n", memory_limit); |
2babf5c2 ME |
83 | |
84 | return 0; | |
85 | } | |
86 | early_param("mem", early_parse_mem); | |
87 | ||
307cfe71 BH |
88 | /* |
89 | * overlaps_initrd - check for overlap with page aligned extension of | |
90 | * initrd. | |
91 | */ | |
92 | static inline int overlaps_initrd(unsigned long start, unsigned long size) | |
93 | { | |
94 | #ifdef CONFIG_BLK_DEV_INITRD | |
95 | if (!initrd_start) | |
96 | return 0; | |
97 | ||
98 | return (start + size) > _ALIGN_DOWN(initrd_start, PAGE_SIZE) && | |
99 | start <= _ALIGN_UP(initrd_end, PAGE_SIZE); | |
100 | #else | |
101 | return 0; | |
102 | #endif | |
103 | } | |
104 | ||
3c607ce2 LV |
105 | /** |
106 | * move_device_tree - move tree to an unused area, if needed. | |
107 | * | |
108 | * The device tree may be allocated beyond our memory limit, or inside the | |
307cfe71 BH |
109 | * crash kernel region for kdump, or within the page aligned range of initrd. |
110 | * If so, move it out of the way. | |
2babf5c2 | 111 | */ |
18f032cb | 112 | static void __init move_device_tree(void) |
2babf5c2 ME |
113 | { |
114 | unsigned long start, size; | |
115 | void *p; | |
116 | ||
117 | DBG("-> move_device_tree\n"); | |
118 | ||
119 | start = __pa(initial_boot_params); | |
060f78c2 | 120 | size = fdt_totalsize(initial_boot_params); |
2babf5c2 | 121 | |
6dd22700 | 122 | if ((memory_limit && (start + size) > PHYSICAL_START + memory_limit) || |
307cfe71 BH |
123 | overlaps_crashkernel(start, size) || |
124 | overlaps_initrd(start, size)) { | |
e63075a3 | 125 | p = __va(memblock_alloc(size, PAGE_SIZE)); |
2babf5c2 | 126 | memcpy(p, initial_boot_params, size); |
060f78c2 | 127 | initial_boot_params = p; |
2babf5c2 ME |
128 | DBG("Moved device tree to 0x%p\n", p); |
129 | } | |
130 | ||
131 | DBG("<- move_device_tree\n"); | |
132 | } | |
9b6b563c | 133 | |
d205819e PM |
134 | /* |
135 | * ibm,pa-features is a per-cpu property that contains a string of | |
136 | * attribute descriptors, each of which has a 2 byte header plus up | |
137 | * to 254 bytes worth of processor attribute bits. First header | |
138 | * byte specifies the number of bytes following the header. | |
139 | * Second header byte is an "attribute-specifier" type, of which | |
140 | * zero is the only currently-defined value. | |
141 | * Implementation: Pass in the byte and bit offset for the feature | |
142 | * that we are interested in. The function will return -1 if the | |
143 | * pa-features property is missing, or a 1/0 to indicate if the feature | |
144 | * is supported/not supported. Note that the bit numbers are | |
145 | * big-endian to match the definition in PAPR. | |
146 | */ | |
147 | static struct ibm_pa_feature { | |
148 | unsigned long cpu_features; /* CPU_FTR_xxx bit */ | |
44ae3ab3 | 149 | unsigned long mmu_features; /* MMU_FTR_xxx bit */ |
d205819e PM |
150 | unsigned int cpu_user_ftrs; /* PPC_FEATURE_xxx bit */ |
151 | unsigned char pabyte; /* byte number in ibm,pa-features */ | |
152 | unsigned char pabit; /* bit number (big-endian) */ | |
153 | unsigned char invert; /* if 1, pa bit set => clear feature */ | |
154 | } ibm_pa_features[] __initdata = { | |
44ae3ab3 ME |
155 | {0, 0, PPC_FEATURE_HAS_MMU, 0, 0, 0}, |
156 | {0, 0, PPC_FEATURE_HAS_FPU, 0, 1, 0}, | |
44ae3ab3 ME |
157 | {CPU_FTR_CTRL, 0, 0, 0, 3, 0}, |
158 | {CPU_FTR_NOEXECUTE, 0, 0, 0, 6, 0}, | |
159 | {CPU_FTR_NODSISRALIGN, 0, 0, 1, 1, 1}, | |
160 | {0, MMU_FTR_CI_LARGE_PAGE, 0, 1, 2, 0}, | |
339d76c5 | 161 | {CPU_FTR_REAL_LE, PPC_FEATURE_TRUE_LE, 5, 0, 0}, |
9e819963 AK |
162 | /* |
163 | * If the kernel doesn't support TM (ie. CONFIG_PPC_TRANSACTIONAL_MEM=n), | |
164 | * we don't want to turn on CPU_FTR_TM here, so we use CPU_FTR_TM_COMP | |
165 | * which is 0 if the kernel doesn't support TM. | |
166 | */ | |
167 | {CPU_FTR_TM_COMP, 0, 0, 22, 0, 0}, | |
d205819e PM |
168 | }; |
169 | ||
9d0c4dfe | 170 | static void __init scan_features(unsigned long node, const unsigned char *ftrs, |
974a76f5 PM |
171 | unsigned long tablelen, |
172 | struct ibm_pa_feature *fp, | |
173 | unsigned long ft_size) | |
d205819e | 174 | { |
974a76f5 | 175 | unsigned long i, len, bit; |
d205819e PM |
176 | |
177 | /* find descriptor with type == 0 */ | |
178 | for (;;) { | |
179 | if (tablelen < 3) | |
180 | return; | |
974a76f5 | 181 | len = 2 + ftrs[0]; |
d205819e PM |
182 | if (tablelen < len) |
183 | return; /* descriptor 0 not found */ | |
974a76f5 | 184 | if (ftrs[1] == 0) |
d205819e PM |
185 | break; |
186 | tablelen -= len; | |
974a76f5 | 187 | ftrs += len; |
d205819e PM |
188 | } |
189 | ||
190 | /* loop over bits we know about */ | |
974a76f5 PM |
191 | for (i = 0; i < ft_size; ++i, ++fp) { |
192 | if (fp->pabyte >= ftrs[0]) | |
d205819e | 193 | continue; |
974a76f5 | 194 | bit = (ftrs[2 + fp->pabyte] >> (7 - fp->pabit)) & 1; |
d205819e PM |
195 | if (bit ^ fp->invert) { |
196 | cur_cpu_spec->cpu_features |= fp->cpu_features; | |
197 | cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftrs; | |
44ae3ab3 | 198 | cur_cpu_spec->mmu_features |= fp->mmu_features; |
d205819e PM |
199 | } else { |
200 | cur_cpu_spec->cpu_features &= ~fp->cpu_features; | |
201 | cur_cpu_spec->cpu_user_features &= ~fp->cpu_user_ftrs; | |
44ae3ab3 | 202 | cur_cpu_spec->mmu_features &= ~fp->mmu_features; |
d205819e PM |
203 | } |
204 | } | |
205 | } | |
206 | ||
974a76f5 PM |
207 | static void __init check_cpu_pa_features(unsigned long node) |
208 | { | |
9d0c4dfe RH |
209 | const unsigned char *pa_ftrs; |
210 | int tablelen; | |
974a76f5 PM |
211 | |
212 | pa_ftrs = of_get_flat_dt_prop(node, "ibm,pa-features", &tablelen); | |
213 | if (pa_ftrs == NULL) | |
214 | return; | |
215 | ||
216 | scan_features(node, pa_ftrs, tablelen, | |
217 | ibm_pa_features, ARRAY_SIZE(ibm_pa_features)); | |
218 | } | |
219 | ||
94491685 | 220 | #ifdef CONFIG_PPC_STD_MMU_64 |
9c61f7a0 | 221 | static void __init init_mmu_slb_size(unsigned long node) |
584f8b71 | 222 | { |
9d0c4dfe | 223 | const __be32 *slb_size_ptr; |
584f8b71 | 224 | |
9c61f7a0 AK |
225 | slb_size_ptr = of_get_flat_dt_prop(node, "slb-size", NULL) ? : |
226 | of_get_flat_dt_prop(node, "ibm,slb-size", NULL); | |
227 | ||
228 | if (slb_size_ptr) | |
dc0e643a | 229 | mmu_slb_size = be32_to_cpup(slb_size_ptr); |
584f8b71 MN |
230 | } |
231 | #else | |
9c61f7a0 | 232 | #define init_mmu_slb_size(node) do { } while(0) |
584f8b71 MN |
233 | #endif |
234 | ||
974a76f5 PM |
235 | static struct feature_property { |
236 | const char *name; | |
237 | u32 min_value; | |
238 | unsigned long cpu_feature; | |
239 | unsigned long cpu_user_ftr; | |
240 | } feature_properties[] __initdata = { | |
241 | #ifdef CONFIG_ALTIVEC | |
242 | {"altivec", 0, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC}, | |
243 | {"ibm,vmx", 1, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC}, | |
244 | #endif /* CONFIG_ALTIVEC */ | |
b962ce9d MN |
245 | #ifdef CONFIG_VSX |
246 | /* Yes, this _really_ is ibm,vmx == 2 to enable VSX */ | |
247 | {"ibm,vmx", 2, CPU_FTR_VSX, PPC_FEATURE_HAS_VSX}, | |
248 | #endif /* CONFIG_VSX */ | |
974a76f5 PM |
249 | #ifdef CONFIG_PPC64 |
250 | {"ibm,dfp", 1, 0, PPC_FEATURE_HAS_DFP}, | |
251 | {"ibm,purr", 1, CPU_FTR_PURR, 0}, | |
252 | {"ibm,spurr", 1, CPU_FTR_SPURR, 0}, | |
253 | #endif /* CONFIG_PPC64 */ | |
254 | }; | |
255 | ||
14b3d926 VB |
256 | #if defined(CONFIG_44x) && defined(CONFIG_PPC_FPU) |
257 | static inline void identical_pvr_fixup(unsigned long node) | |
258 | { | |
259 | unsigned int pvr; | |
9d0c4dfe | 260 | const char *model = of_get_flat_dt_prop(node, "model", NULL); |
14b3d926 VB |
261 | |
262 | /* | |
263 | * Since 440GR(x)/440EP(x) processors have the same pvr, | |
264 | * we check the node path and set bit 28 in the cur_cpu_spec | |
265 | * pvr for EP(x) processor version. This bit is always 0 in | |
266 | * the "real" pvr. Then we call identify_cpu again with | |
267 | * the new logical pvr to enable FPU support. | |
268 | */ | |
269 | if (model && strstr(model, "440EP")) { | |
270 | pvr = cur_cpu_spec->pvr_value | 0x8; | |
271 | identify_cpu(0, pvr); | |
272 | DBG("Using logical pvr %x for %s\n", pvr, model); | |
273 | } | |
274 | } | |
275 | #else | |
276 | #define identical_pvr_fixup(node) do { } while(0) | |
277 | #endif | |
278 | ||
974a76f5 PM |
279 | static void __init check_cpu_feature_properties(unsigned long node) |
280 | { | |
281 | unsigned long i; | |
282 | struct feature_property *fp = feature_properties; | |
dc0e643a | 283 | const __be32 *prop; |
974a76f5 PM |
284 | |
285 | for (i = 0; i < ARRAY_SIZE(feature_properties); ++i, ++fp) { | |
286 | prop = of_get_flat_dt_prop(node, fp->name, NULL); | |
dc0e643a | 287 | if (prop && be32_to_cpup(prop) >= fp->min_value) { |
974a76f5 PM |
288 | cur_cpu_spec->cpu_features |= fp->cpu_feature; |
289 | cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftr; | |
290 | } | |
291 | } | |
292 | } | |
293 | ||
9b6b563c | 294 | static int __init early_init_dt_scan_cpus(unsigned long node, |
4df20460 AB |
295 | const char *uname, int depth, |
296 | void *data) | |
9b6b563c | 297 | { |
9d0c4dfe | 298 | const char *type = of_get_flat_dt_prop(node, "device_type", NULL); |
dc0e643a IM |
299 | const __be32 *prop; |
300 | const __be32 *intserv; | |
4df20460 | 301 | int i, nthreads; |
9d0c4dfe | 302 | int len; |
9d07bc84 | 303 | int found = -1; |
208b3a4c | 304 | int found_thread = 0; |
9b6b563c PM |
305 | |
306 | /* We are scanning "cpu" nodes only */ | |
307 | if (type == NULL || strcmp(type, "cpu") != 0) | |
308 | return 0; | |
309 | ||
4df20460 AB |
310 | /* Get physical cpuid */ |
311 | intserv = of_get_flat_dt_prop(node, "ibm,ppc-interrupt-server#s", &len); | |
e16c8765 AF |
312 | if (!intserv) |
313 | intserv = of_get_flat_dt_prop(node, "reg", &len); | |
314 | ||
315 | nthreads = len / sizeof(int); | |
4df20460 AB |
316 | |
317 | /* | |
318 | * Now see if any of these threads match our boot cpu. | |
319 | * NOTE: This must match the parsing done in smp_setup_cpu_maps. | |
320 | */ | |
321 | for (i = 0; i < nthreads; i++) { | |
322 | /* | |
323 | * version 2 of the kexec param format adds the phys cpuid of | |
324 | * booted proc. | |
325 | */ | |
060f78c2 | 326 | if (fdt_version(initial_boot_params) >= 2) { |
dc0e643a | 327 | if (be32_to_cpu(intserv[i]) == |
060f78c2 | 328 | fdt_boot_cpuid_phys(initial_boot_params)) { |
9d07bc84 | 329 | found = boot_cpu_count; |
208b3a4c BH |
330 | found_thread = i; |
331 | } | |
4df20460 AB |
332 | } else { |
333 | /* | |
334 | * Check if it's the boot-cpu, set it's hw index now, | |
335 | * unfortunately this format did not support booting | |
336 | * off secondary threads. | |
337 | */ | |
338 | if (of_get_flat_dt_prop(node, | |
9d07bc84 BH |
339 | "linux,boot-cpu", NULL) != NULL) |
340 | found = boot_cpu_count; | |
9b6b563c | 341 | } |
4df20460 AB |
342 | #ifdef CONFIG_SMP |
343 | /* logical cpu id is always 0 on UP kernels */ | |
9d07bc84 | 344 | boot_cpu_count++; |
4df20460 AB |
345 | #endif |
346 | } | |
347 | ||
7222f779 BH |
348 | /* Not the boot CPU */ |
349 | if (found < 0) | |
350 | return 0; | |
9b6b563c | 351 | |
7222f779 BH |
352 | DBG("boot cpu: logical %d physical %d\n", found, |
353 | be32_to_cpu(intserv[found_thread])); | |
354 | boot_cpuid = found; | |
355 | set_hard_smp_processor_id(found, be32_to_cpu(intserv[found_thread])); | |
14b3d926 | 356 | |
7222f779 BH |
357 | /* |
358 | * PAPR defines "logical" PVR values for cpus that | |
359 | * meet various levels of the architecture: | |
360 | * 0x0f000001 Architecture version 2.04 | |
361 | * 0x0f000002 Architecture version 2.05 | |
362 | * If the cpu-version property in the cpu node contains | |
363 | * such a value, we call identify_cpu again with the | |
364 | * logical PVR value in order to use the cpu feature | |
365 | * bits appropriate for the architecture level. | |
366 | * | |
367 | * A POWER6 partition in "POWER6 architected" mode | |
368 | * uses the 0x0f000002 PVR value; in POWER5+ mode | |
369 | * it uses 0x0f000001. | |
370 | */ | |
371 | prop = of_get_flat_dt_prop(node, "cpu-version", NULL); | |
372 | if (prop && (be32_to_cpup(prop) & 0xff000000) == 0x0f000000) | |
373 | identify_cpu(0, be32_to_cpup(prop)); | |
374 | ||
375 | identical_pvr_fixup(node); | |
9b6b563c | 376 | |
974a76f5 | 377 | check_cpu_feature_properties(node); |
d205819e | 378 | check_cpu_pa_features(node); |
9c61f7a0 | 379 | init_mmu_slb_size(node); |
d205819e | 380 | |
4a85b31d | 381 | #ifdef CONFIG_PPC64 |
4df20460 | 382 | if (nthreads > 1) |
9b6b563c | 383 | cur_cpu_spec->cpu_features |= CPU_FTR_SMT; |
4df20460 AB |
384 | else |
385 | cur_cpu_spec->cpu_features &= ~CPU_FTR_SMT; | |
9b6b563c | 386 | #endif |
9b6b563c PM |
387 | return 0; |
388 | } | |
389 | ||
e51df2c1 AB |
390 | static int __init early_init_dt_scan_chosen_ppc(unsigned long node, |
391 | const char *uname, | |
392 | int depth, void *data) | |
9b6b563c | 393 | { |
9d0c4dfe | 394 | const unsigned long *lprop; /* All these set by kernel, so no need to convert endian */ |
9b6b563c | 395 | |
32c97689 GL |
396 | /* Use common scan routine to determine if this is the chosen node */ |
397 | if (early_init_dt_scan_chosen(node, uname, depth, data) == 0) | |
398 | return 0; | |
399 | ||
9b6b563c PM |
400 | #ifdef CONFIG_PPC64 |
401 | /* check if iommu is forced on or off */ | |
3c726f8d | 402 | if (of_get_flat_dt_prop(node, "linux,iommu-off", NULL) != NULL) |
9b6b563c | 403 | iommu_is_off = 1; |
3c726f8d | 404 | if (of_get_flat_dt_prop(node, "linux,iommu-force-on", NULL) != NULL) |
9b6b563c PM |
405 | iommu_force_on = 1; |
406 | #endif | |
407 | ||
2babf5c2 | 408 | /* mem=x on the command line is the preferred mechanism */ |
86e03221 GL |
409 | lprop = of_get_flat_dt_prop(node, "linux,memory-limit", NULL); |
410 | if (lprop) | |
411 | memory_limit = *lprop; | |
9b6b563c PM |
412 | |
413 | #ifdef CONFIG_PPC64 | |
86e03221 GL |
414 | lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-start", NULL); |
415 | if (lprop) | |
416 | tce_alloc_start = *lprop; | |
417 | lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-end", NULL); | |
418 | if (lprop) | |
419 | tce_alloc_end = *lprop; | |
9b6b563c PM |
420 | #endif |
421 | ||
dcee3036 | 422 | #ifdef CONFIG_KEXEC |
63277161 | 423 | lprop = of_get_flat_dt_prop(node, "linux,crashkernel-base", NULL); |
70c6cc37 LV |
424 | if (lprop) |
425 | crashk_res.start = *lprop; | |
dcee3036 | 426 | |
63277161 | 427 | lprop = of_get_flat_dt_prop(node, "linux,crashkernel-size", NULL); |
70c6cc37 LV |
428 | if (lprop) |
429 | crashk_res.end = crashk_res.start + *lprop - 1; | |
dcee3036 | 430 | #endif |
32c97689 GL |
431 | |
432 | /* break now */ | |
433 | return 1; | |
9b6b563c PM |
434 | } |
435 | ||
0204568a PM |
436 | #ifdef CONFIG_PPC_PSERIES |
437 | /* | |
438 | * Interpret the ibm,dynamic-memory property in the | |
439 | * /ibm,dynamic-reconfiguration-memory node. | |
440 | * This contains a list of memory blocks along with NUMA affinity | |
441 | * information. | |
442 | */ | |
443 | static int __init early_init_dt_scan_drconf_memory(unsigned long node) | |
444 | { | |
9d0c4dfe RH |
445 | const __be32 *dm, *ls, *usm; |
446 | int l; | |
447 | unsigned long n, flags; | |
95f72d1e | 448 | u64 base, size, memblock_size; |
cf00085d | 449 | unsigned int is_kexec_kdump = 0, rngs; |
0204568a | 450 | |
3fdfd990 | 451 | ls = of_get_flat_dt_prop(node, "ibm,lmb-size", &l); |
0f0b56c3 | 452 | if (ls == NULL || l < dt_root_size_cells * sizeof(__be32)) |
0204568a | 453 | return 0; |
95f72d1e | 454 | memblock_size = dt_mem_next_cell(dt_root_size_cells, &ls); |
0204568a | 455 | |
63277161 | 456 | dm = of_get_flat_dt_prop(node, "ibm,dynamic-memory", &l); |
0f0b56c3 | 457 | if (dm == NULL || l < sizeof(__be32)) |
0204568a PM |
458 | return 0; |
459 | ||
e91ae5bd | 460 | n = of_read_number(dm++, 1); /* number of entries */ |
0f0b56c3 | 461 | if (l < (n * (dt_root_addr_cells + 4) + 1) * sizeof(__be32)) |
0204568a PM |
462 | return 0; |
463 | ||
cf00085d | 464 | /* check if this is a kexec/kdump kernel. */ |
63277161 | 465 | usm = of_get_flat_dt_prop(node, "linux,drconf-usable-memory", |
cf00085d C |
466 | &l); |
467 | if (usm != NULL) | |
468 | is_kexec_kdump = 1; | |
469 | ||
0204568a PM |
470 | for (; n != 0; --n) { |
471 | base = dt_mem_next_cell(dt_root_addr_cells, &dm); | |
e91ae5bd | 472 | flags = of_read_number(&dm[3], 1); |
0204568a PM |
473 | /* skip DRC index, pad, assoc. list index, flags */ |
474 | dm += 4; | |
9afac933 AK |
475 | /* skip this block if the reserved bit is set in flags |
476 | or if the block is not assigned to this partition */ | |
477 | if ((flags & DRCONF_MEM_RESERVED) || | |
478 | !(flags & DRCONF_MEM_ASSIGNED)) | |
0204568a | 479 | continue; |
95f72d1e | 480 | size = memblock_size; |
cf00085d C |
481 | rngs = 1; |
482 | if (is_kexec_kdump) { | |
483 | /* | |
95f72d1e | 484 | * For each memblock in ibm,dynamic-memory, a corresponding |
cf00085d C |
485 | * entry in linux,drconf-usable-memory property contains |
486 | * a counter 'p' followed by 'p' (base, size) duple. | |
487 | * Now read the counter from | |
488 | * linux,drconf-usable-memory property | |
489 | */ | |
490 | rngs = dt_mem_next_cell(dt_root_size_cells, &usm); | |
491 | if (!rngs) /* there are no (base, size) duple */ | |
0204568a | 492 | continue; |
0204568a | 493 | } |
cf00085d C |
494 | do { |
495 | if (is_kexec_kdump) { | |
496 | base = dt_mem_next_cell(dt_root_addr_cells, | |
497 | &usm); | |
498 | size = dt_mem_next_cell(dt_root_size_cells, | |
499 | &usm); | |
500 | } | |
501 | if (iommu_is_off) { | |
502 | if (base >= 0x80000000ul) | |
503 | continue; | |
504 | if ((base + size) > 0x80000000ul) | |
505 | size = 0x80000000ul - base; | |
506 | } | |
95f72d1e | 507 | memblock_add(base, size); |
cf00085d | 508 | } while (--rngs); |
0204568a | 509 | } |
95f72d1e | 510 | memblock_dump_all(); |
0204568a PM |
511 | return 0; |
512 | } | |
513 | #else | |
514 | #define early_init_dt_scan_drconf_memory(node) 0 | |
515 | #endif /* CONFIG_PPC_PSERIES */ | |
9b6b563c | 516 | |
51975db0 GL |
517 | static int __init early_init_dt_scan_memory_ppc(unsigned long node, |
518 | const char *uname, | |
519 | int depth, void *data) | |
9b6b563c | 520 | { |
0204568a PM |
521 | if (depth == 1 && |
522 | strcmp(uname, "ibm,dynamic-reconfiguration-memory") == 0) | |
523 | return early_init_dt_scan_drconf_memory(node); | |
51975db0 GL |
524 | |
525 | return early_init_dt_scan_memory(node, uname, depth, data); | |
526 | } | |
0204568a | 527 | |
b27652dd KH |
528 | /* |
529 | * For a relocatable kernel, we need to get the memstart_addr first, | |
530 | * then use it to calculate the virtual kernel start address. This has | |
531 | * to happen at a very early stage (before machine_init). In this case, | |
532 | * we just want to get the memstart_address and would not like to mess the | |
533 | * memblock at this stage. So introduce a variable to skip the memblock_add() | |
534 | * for this reason. | |
535 | */ | |
536 | #ifdef CONFIG_RELOCATABLE | |
537 | static int add_mem_to_memblock = 1; | |
538 | #else | |
539 | #define add_mem_to_memblock 1 | |
540 | #endif | |
541 | ||
51975db0 GL |
542 | void __init early_init_dt_add_memory_arch(u64 base, u64 size) |
543 | { | |
cd3db0c4 | 544 | #ifdef CONFIG_PPC64 |
51975db0 GL |
545 | if (iommu_is_off) { |
546 | if (base >= 0x80000000ul) | |
547 | return; | |
548 | if ((base + size) > 0x80000000ul) | |
549 | size = 0x80000000ul - base; | |
550 | } | |
9b6b563c | 551 | #endif |
03bf469a BH |
552 | /* Keep track of the beginning of memory -and- the size of |
553 | * the very first block in the device-tree as it represents | |
554 | * the RMA on ppc64 server | |
555 | */ | |
556 | if (base < memstart_addr) { | |
557 | memstart_addr = base; | |
558 | first_memblock_size = size; | |
559 | } | |
cd3db0c4 BH |
560 | |
561 | /* Add the chunk to the MEMBLOCK list */ | |
b27652dd KH |
562 | if (add_mem_to_memblock) |
563 | memblock_add(base, size); | |
9b6b563c PM |
564 | } |
565 | ||
c039e3a8 | 566 | static void __init early_reserve_mem_dt(void) |
0962e800 | 567 | { |
9d0c4dfe RH |
568 | unsigned long i, dt_root; |
569 | int len; | |
0962e800 JK |
570 | const __be32 *prop; |
571 | ||
24bbd929 | 572 | early_init_fdt_reserve_self(); |
edba274c RH |
573 | early_init_fdt_scan_reserved_mem(); |
574 | ||
0962e800 JK |
575 | dt_root = of_get_flat_dt_root(); |
576 | ||
577 | prop = of_get_flat_dt_prop(dt_root, "reserved-ranges", &len); | |
578 | ||
579 | if (!prop) | |
c039e3a8 BH |
580 | return; |
581 | ||
582 | DBG("Found new-style reserved-ranges\n"); | |
0962e800 JK |
583 | |
584 | /* Each reserved range is an (address,size) pair, 2 cells each, | |
585 | * totalling 4 cells per range. */ | |
586 | for (i = 0; i < len / (sizeof(*prop) * 4); i++) { | |
587 | u64 base, size; | |
588 | ||
589 | base = of_read_number(prop + (i * 4) + 0, 2); | |
590 | size = of_read_number(prop + (i * 4) + 2, 2); | |
591 | ||
c039e3a8 BH |
592 | if (size) { |
593 | DBG("reserving: %llx -> %llx\n", base, size); | |
0962e800 | 594 | memblock_reserve(base, size); |
c039e3a8 | 595 | } |
0962e800 | 596 | } |
0962e800 JK |
597 | } |
598 | ||
9b6b563c PM |
599 | static void __init early_reserve_mem(void) |
600 | { | |
dc0e643a | 601 | __be64 *reserve_map; |
9b6b563c | 602 | |
dc0e643a | 603 | reserve_map = (__be64 *)(((unsigned long)initial_boot_params) + |
060f78c2 | 604 | fdt_off_mem_rsvmap(initial_boot_params)); |
4d1f3f25 | 605 | |
c039e3a8 BH |
606 | /* Look for the new "reserved-regions" property in the DT */ |
607 | early_reserve_mem_dt(); | |
0962e800 | 608 | |
30437b3e | 609 | #ifdef CONFIG_BLK_DEV_INITRD |
c039e3a8 BH |
610 | /* Then reserve the initrd, if any */ |
611 | if (initrd_start && (initrd_end > initrd_start)) { | |
307cfe71 BH |
612 | memblock_reserve(_ALIGN_DOWN(__pa(initrd_start), PAGE_SIZE), |
613 | _ALIGN_UP(initrd_end, PAGE_SIZE) - | |
614 | _ALIGN_DOWN(initrd_start, PAGE_SIZE)); | |
c039e3a8 | 615 | } |
30437b3e DG |
616 | #endif /* CONFIG_BLK_DEV_INITRD */ |
617 | ||
cbbcf340 KG |
618 | #ifdef CONFIG_PPC32 |
619 | /* | |
620 | * Handle the case where we might be booting from an old kexec | |
621 | * image that setup the mem_rsvmap as pairs of 32-bit values | |
622 | */ | |
dc0e643a | 623 | if (be64_to_cpup(reserve_map) > 0xffffffffull) { |
cbbcf340 | 624 | u32 base_32, size_32; |
dc0e643a | 625 | __be32 *reserve_map_32 = (__be32 *)reserve_map; |
cbbcf340 | 626 | |
c039e3a8 BH |
627 | DBG("Found old 32-bit reserve map\n"); |
628 | ||
cbbcf340 | 629 | while (1) { |
dc0e643a IM |
630 | base_32 = be32_to_cpup(reserve_map_32++); |
631 | size_32 = be32_to_cpup(reserve_map_32++); | |
cbbcf340 KG |
632 | if (size_32 == 0) |
633 | break; | |
329dda08 | 634 | DBG("reserving: %x -> %x\n", base_32, size_32); |
95f72d1e | 635 | memblock_reserve(base_32, size_32); |
cbbcf340 KG |
636 | } |
637 | return; | |
638 | } | |
639 | #endif | |
9b6b563c PM |
640 | } |
641 | ||
642 | void __init early_init_devtree(void *params) | |
643 | { | |
49a84965 | 644 | phys_addr_t limit; |
6ca4f749 | 645 | |
44348105 | 646 | DBG(" -> early_init_devtree(%p)\n", params); |
9b6b563c | 647 | |
ad72a279 ME |
648 | /* Too early to BUG_ON(), do it by hand */ |
649 | if (!early_init_dt_verify(params)) | |
650 | panic("BUG: Failed verifying flat device tree, bad version?"); | |
651 | ||
458148c0 ME |
652 | #ifdef CONFIG_PPC_RTAS |
653 | /* Some machines might need RTAS info for debugging, grab it now. */ | |
654 | of_scan_flat_dt(early_init_dt_scan_rtas, NULL); | |
655 | #endif | |
656 | ||
14a43e69 BH |
657 | #ifdef CONFIG_PPC_POWERNV |
658 | /* Some machines might need OPAL info for debugging, grab it now. */ | |
659 | of_scan_flat_dt(early_init_dt_scan_opal, NULL); | |
660 | #endif | |
661 | ||
eb39c880 MS |
662 | #ifdef CONFIG_FA_DUMP |
663 | /* scan tree to see if dump is active during last boot */ | |
664 | of_scan_flat_dt(early_init_dt_scan_fw_dump, NULL); | |
665 | #endif | |
666 | ||
9b6b563c PM |
667 | /* Retrieve various informations from the /chosen node of the |
668 | * device-tree, including the platform type, initrd location and | |
669 | * size, TCE reserve, and more ... | |
670 | */ | |
3e47d147 | 671 | of_scan_flat_dt(early_init_dt_scan_chosen_ppc, boot_command_line); |
9b6b563c | 672 | |
95f72d1e | 673 | /* Scan memory nodes and rebuild MEMBLOCKs */ |
3c726f8d | 674 | of_scan_flat_dt(early_init_dt_scan_root, NULL); |
51975db0 | 675 | of_scan_flat_dt(early_init_dt_scan_memory_ppc, NULL); |
846f77b0 | 676 | |
846f77b0 ME |
677 | parse_early_param(); |
678 | ||
ba14f649 KG |
679 | /* make sure we've parsed cmdline for mem= before this */ |
680 | if (memory_limit) | |
a84fcd46 | 681 | first_memblock_size = min_t(u64, first_memblock_size, memory_limit); |
ba14f649 | 682 | setup_initial_memory_limit(memstart_addr, first_memblock_size); |
95f72d1e YL |
683 | /* Reserve MEMBLOCK regions used by kernel, initrd, dt, etc... */ |
684 | memblock_reserve(PHYSICAL_START, __pa(klimit) - PHYSICAL_START); | |
549e8152 PM |
685 | /* If relocatable, reserve first 32k for interrupt vectors etc. */ |
686 | if (PHYSICAL_START > MEMORY_START) | |
95f72d1e | 687 | memblock_reserve(MEMORY_START, 0x8000); |
47310413 | 688 | reserve_kdump_trampoline(); |
eb39c880 MS |
689 | #ifdef CONFIG_FA_DUMP |
690 | /* | |
691 | * If we fail to reserve memory for firmware-assisted dump then | |
692 | * fallback to kexec based kdump. | |
693 | */ | |
694 | if (fadump_reserve_mem() == 0) | |
695 | #endif | |
696 | reserve_crashkernel(); | |
9b6b563c PM |
697 | early_reserve_mem(); |
698 | ||
14ed7409 | 699 | /* Ensure that total memory size is page-aligned. */ |
6fbef13c | 700 | limit = ALIGN(memory_limit ?: memblock_phys_mem_size(), PAGE_SIZE); |
95f72d1e | 701 | memblock_enforce_memory_limit(limit); |
6ca4f749 | 702 | |
1aadc056 | 703 | memblock_allow_resize(); |
95f72d1e | 704 | memblock_dump_all(); |
2babf5c2 | 705 | |
95f72d1e | 706 | DBG("Phys. mem: %llx\n", memblock_phys_mem_size()); |
2babf5c2 ME |
707 | |
708 | /* We may need to relocate the flat tree, do it now. | |
709 | * FIXME .. and the initrd too? */ | |
710 | move_device_tree(); | |
711 | ||
1426d5a3 ME |
712 | allocate_pacas(); |
713 | ||
9b6b563c PM |
714 | DBG("Scanning CPUs ...\n"); |
715 | ||
25985edc | 716 | /* Retrieve CPU related informations from the flat tree |
3c726f8d | 717 | * (altivec support, boot CPU ID, ...) |
9b6b563c | 718 | */ |
3c726f8d | 719 | of_scan_flat_dt(early_init_dt_scan_cpus, NULL); |
36ae37e3 | 720 | if (boot_cpuid < 0) { |
d939be3a | 721 | printk("Failed to identify boot CPU !\n"); |
36ae37e3 BH |
722 | BUG(); |
723 | } | |
9b6b563c | 724 | |
7ac87abb ME |
725 | #if defined(CONFIG_SMP) && defined(CONFIG_PPC64) |
726 | /* We'll later wait for secondaries to check in; there are | |
727 | * NCPUS-1 non-boot CPUs :-) | |
728 | */ | |
729 | spinning_secondaries = boot_cpu_count - 1; | |
730 | #endif | |
731 | ||
55672ecf MS |
732 | #ifdef CONFIG_PPC_POWERNV |
733 | /* Scan and build the list of machine check recoverable ranges */ | |
734 | of_scan_flat_dt(early_init_dt_scan_recoverable_ranges, NULL); | |
735 | #endif | |
736 | ||
9b6b563c PM |
737 | DBG(" <- early_init_devtree()\n"); |
738 | } | |
739 | ||
b27652dd KH |
740 | #ifdef CONFIG_RELOCATABLE |
741 | /* | |
742 | * This function run before early_init_devtree, so we have to init | |
743 | * initial_boot_params. | |
744 | */ | |
745 | void __init early_get_first_memblock_info(void *params, phys_addr_t *size) | |
746 | { | |
747 | /* Setup flat device-tree pointer */ | |
748 | initial_boot_params = params; | |
749 | ||
750 | /* | |
751 | * Scan the memory nodes and set add_mem_to_memblock to 0 to avoid | |
752 | * mess the memblock. | |
753 | */ | |
754 | add_mem_to_memblock = 0; | |
755 | of_scan_flat_dt(early_init_dt_scan_root, NULL); | |
756 | of_scan_flat_dt(early_init_dt_scan_memory_ppc, NULL); | |
757 | add_mem_to_memblock = 1; | |
758 | ||
759 | if (size) | |
760 | *size = first_memblock_size; | |
761 | } | |
762 | #endif | |
763 | ||
9b6b563c PM |
764 | /******* |
765 | * | |
766 | * New implementation of the OF "find" APIs, return a refcounted | |
767 | * object, call of_node_put() when done. The device tree and list | |
768 | * are protected by a rw_lock. | |
769 | * | |
770 | * Note that property management will need some locking as well, | |
771 | * this isn't dealt with yet. | |
772 | * | |
773 | *******/ | |
774 | ||
b37193b7 BH |
775 | /** |
776 | * of_get_ibm_chip_id - Returns the IBM "chip-id" of a device | |
777 | * @np: device node of the device | |
778 | * | |
779 | * This looks for a property "ibm,chip-id" in the node or any | |
780 | * of its parents and returns its content, or -1 if it cannot | |
781 | * be found. | |
782 | */ | |
783 | int of_get_ibm_chip_id(struct device_node *np) | |
784 | { | |
785 | of_node_get(np); | |
1856f50c | 786 | while (np) { |
1856f50c | 787 | u32 chip_id; |
b37193b7 | 788 | |
1856f50c CJ |
789 | /* |
790 | * Skiboot may produce memory nodes that contain more than one | |
791 | * cell in chip-id, we only read the first one here. | |
792 | */ | |
793 | if (!of_property_read_u32(np, "ibm,chip-id", &chip_id)) { | |
b37193b7 | 794 | of_node_put(np); |
1856f50c | 795 | return chip_id; |
b37193b7 | 796 | } |
16c1d606 ME |
797 | |
798 | np = of_get_next_parent(np); | |
b37193b7 BH |
799 | } |
800 | return -1; | |
801 | } | |
b130e7c0 | 802 | EXPORT_SYMBOL(of_get_ibm_chip_id); |
b37193b7 | 803 | |
3eb906c6 ME |
804 | /** |
805 | * cpu_to_chip_id - Return the cpus chip-id | |
806 | * @cpu: The logical cpu number. | |
807 | * | |
808 | * Return the value of the ibm,chip-id property corresponding to the given | |
809 | * logical cpu number. If the chip-id can not be found, returns -1. | |
810 | */ | |
811 | int cpu_to_chip_id(int cpu) | |
812 | { | |
813 | struct device_node *np; | |
814 | ||
815 | np = of_get_cpu_node(cpu, NULL); | |
816 | if (!np) | |
817 | return -1; | |
818 | ||
819 | of_node_put(np); | |
820 | return of_get_ibm_chip_id(np); | |
821 | } | |
822 | EXPORT_SYMBOL(cpu_to_chip_id); | |
823 | ||
819d5965 SH |
824 | bool arch_match_cpu_phys_id(int cpu, u64 phys_id) |
825 | { | |
826 | return (int)phys_id == get_hard_smp_processor_id(cpu); | |
827 | } |