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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> |
7a4571ae | 32 | #include <linux/debugfs.h> |
0ebfff14 | 33 | #include <linux/irq.h> |
95f72d1e | 34 | #include <linux/memblock.h> |
1cf3d8b3 | 35 | #include <linux/of.h> |
708b7eef | 36 | #include <linux/of_fdt.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 PM |
48 | #include <asm/pgtable.h> |
49 | #include <asm/pci.h> | |
50 | #include <asm/iommu.h> | |
51 | #include <asm/btext.h> | |
52 | #include <asm/sections.h> | |
53 | #include <asm/machdep.h> | |
40ef8cbc | 54 | #include <asm/pci-bridge.h> |
2babf5c2 | 55 | #include <asm/kexec.h> |
14a43e69 | 56 | #include <asm/opal.h> |
eb39c880 | 57 | #include <asm/fadump.h> |
0dc3289c | 58 | #include <asm/debug.h> |
14a43e69 | 59 | |
37dd2bad | 60 | #include <mm/mmu_decl.h> |
9b6b563c PM |
61 | |
62 | #ifdef DEBUG | |
63 | #define DBG(fmt...) printk(KERN_ERR fmt) | |
64 | #else | |
65 | #define DBG(fmt...) | |
66 | #endif | |
67 | ||
9b6b563c | 68 | #ifdef CONFIG_PPC64 |
28897731 | 69 | int __initdata iommu_is_off; |
9b6b563c | 70 | int __initdata iommu_force_on; |
cf00a8d1 | 71 | unsigned long tce_alloc_start, tce_alloc_end; |
cd3db0c4 | 72 | u64 ppc64_rma_size; |
9b6b563c | 73 | #endif |
03bf469a | 74 | static phys_addr_t first_memblock_size; |
7ac87abb | 75 | static int __initdata boot_cpu_count; |
9b6b563c | 76 | |
2babf5c2 ME |
77 | static int __init early_parse_mem(char *p) |
78 | { | |
79 | if (!p) | |
80 | return 1; | |
81 | ||
82 | memory_limit = PAGE_ALIGN(memparse(p, &p)); | |
a84fcd46 | 83 | DBG("memory limit = 0x%llx\n", memory_limit); |
2babf5c2 ME |
84 | |
85 | return 0; | |
86 | } | |
87 | early_param("mem", early_parse_mem); | |
88 | ||
307cfe71 BH |
89 | /* |
90 | * overlaps_initrd - check for overlap with page aligned extension of | |
91 | * initrd. | |
92 | */ | |
93 | static inline int overlaps_initrd(unsigned long start, unsigned long size) | |
94 | { | |
95 | #ifdef CONFIG_BLK_DEV_INITRD | |
96 | if (!initrd_start) | |
97 | return 0; | |
98 | ||
99 | return (start + size) > _ALIGN_DOWN(initrd_start, PAGE_SIZE) && | |
100 | start <= _ALIGN_UP(initrd_end, PAGE_SIZE); | |
101 | #else | |
102 | return 0; | |
103 | #endif | |
104 | } | |
105 | ||
3c607ce2 LV |
106 | /** |
107 | * move_device_tree - move tree to an unused area, if needed. | |
108 | * | |
109 | * The device tree may be allocated beyond our memory limit, or inside the | |
307cfe71 BH |
110 | * crash kernel region for kdump, or within the page aligned range of initrd. |
111 | * If so, move it out of the way. | |
2babf5c2 | 112 | */ |
18f032cb | 113 | static void __init move_device_tree(void) |
2babf5c2 ME |
114 | { |
115 | unsigned long start, size; | |
116 | void *p; | |
117 | ||
118 | DBG("-> move_device_tree\n"); | |
119 | ||
120 | start = __pa(initial_boot_params); | |
087f79c4 | 121 | size = be32_to_cpu(initial_boot_params->totalsize); |
2babf5c2 | 122 | |
6dd22700 | 123 | if ((memory_limit && (start + size) > PHYSICAL_START + memory_limit) || |
307cfe71 BH |
124 | overlaps_crashkernel(start, size) || |
125 | overlaps_initrd(start, size)) { | |
e63075a3 | 126 | p = __va(memblock_alloc(size, PAGE_SIZE)); |
2babf5c2 ME |
127 | memcpy(p, initial_boot_params, size); |
128 | initial_boot_params = (struct boot_param_header *)p; | |
129 | DBG("Moved device tree to 0x%p\n", p); | |
130 | } | |
131 | ||
132 | DBG("<- move_device_tree\n"); | |
133 | } | |
9b6b563c | 134 | |
d205819e PM |
135 | /* |
136 | * ibm,pa-features is a per-cpu property that contains a string of | |
137 | * attribute descriptors, each of which has a 2 byte header plus up | |
138 | * to 254 bytes worth of processor attribute bits. First header | |
139 | * byte specifies the number of bytes following the header. | |
140 | * Second header byte is an "attribute-specifier" type, of which | |
141 | * zero is the only currently-defined value. | |
142 | * Implementation: Pass in the byte and bit offset for the feature | |
143 | * that we are interested in. The function will return -1 if the | |
144 | * pa-features property is missing, or a 1/0 to indicate if the feature | |
145 | * is supported/not supported. Note that the bit numbers are | |
146 | * big-endian to match the definition in PAPR. | |
147 | */ | |
148 | static struct ibm_pa_feature { | |
149 | unsigned long cpu_features; /* CPU_FTR_xxx bit */ | |
44ae3ab3 | 150 | unsigned long mmu_features; /* MMU_FTR_xxx bit */ |
d205819e PM |
151 | unsigned int cpu_user_ftrs; /* PPC_FEATURE_xxx bit */ |
152 | unsigned char pabyte; /* byte number in ibm,pa-features */ | |
153 | unsigned char pabit; /* bit number (big-endian) */ | |
154 | unsigned char invert; /* if 1, pa bit set => clear feature */ | |
155 | } ibm_pa_features[] __initdata = { | |
44ae3ab3 ME |
156 | {0, 0, PPC_FEATURE_HAS_MMU, 0, 0, 0}, |
157 | {0, 0, PPC_FEATURE_HAS_FPU, 0, 1, 0}, | |
158 | {0, MMU_FTR_SLB, 0, 0, 2, 0}, | |
159 | {CPU_FTR_CTRL, 0, 0, 0, 3, 0}, | |
160 | {CPU_FTR_NOEXECUTE, 0, 0, 0, 6, 0}, | |
161 | {CPU_FTR_NODSISRALIGN, 0, 0, 1, 1, 1}, | |
162 | {0, MMU_FTR_CI_LARGE_PAGE, 0, 1, 2, 0}, | |
339d76c5 | 163 | {CPU_FTR_REAL_LE, PPC_FEATURE_TRUE_LE, 5, 0, 0}, |
d205819e PM |
164 | }; |
165 | ||
974a76f5 PM |
166 | static void __init scan_features(unsigned long node, unsigned char *ftrs, |
167 | unsigned long tablelen, | |
168 | struct ibm_pa_feature *fp, | |
169 | unsigned long ft_size) | |
d205819e | 170 | { |
974a76f5 | 171 | unsigned long i, len, bit; |
d205819e PM |
172 | |
173 | /* find descriptor with type == 0 */ | |
174 | for (;;) { | |
175 | if (tablelen < 3) | |
176 | return; | |
974a76f5 | 177 | len = 2 + ftrs[0]; |
d205819e PM |
178 | if (tablelen < len) |
179 | return; /* descriptor 0 not found */ | |
974a76f5 | 180 | if (ftrs[1] == 0) |
d205819e PM |
181 | break; |
182 | tablelen -= len; | |
974a76f5 | 183 | ftrs += len; |
d205819e PM |
184 | } |
185 | ||
186 | /* loop over bits we know about */ | |
974a76f5 PM |
187 | for (i = 0; i < ft_size; ++i, ++fp) { |
188 | if (fp->pabyte >= ftrs[0]) | |
d205819e | 189 | continue; |
974a76f5 | 190 | bit = (ftrs[2 + fp->pabyte] >> (7 - fp->pabit)) & 1; |
d205819e PM |
191 | if (bit ^ fp->invert) { |
192 | cur_cpu_spec->cpu_features |= fp->cpu_features; | |
193 | cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftrs; | |
44ae3ab3 | 194 | cur_cpu_spec->mmu_features |= fp->mmu_features; |
d205819e PM |
195 | } else { |
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 | } |
200 | } | |
201 | } | |
202 | ||
974a76f5 PM |
203 | static void __init check_cpu_pa_features(unsigned long node) |
204 | { | |
205 | unsigned char *pa_ftrs; | |
206 | unsigned long tablelen; | |
207 | ||
208 | pa_ftrs = of_get_flat_dt_prop(node, "ibm,pa-features", &tablelen); | |
209 | if (pa_ftrs == NULL) | |
210 | return; | |
211 | ||
212 | scan_features(node, pa_ftrs, tablelen, | |
213 | ibm_pa_features, ARRAY_SIZE(ibm_pa_features)); | |
214 | } | |
215 | ||
94491685 | 216 | #ifdef CONFIG_PPC_STD_MMU_64 |
584f8b71 MN |
217 | static void __init check_cpu_slb_size(unsigned long node) |
218 | { | |
dc0e643a | 219 | __be32 *slb_size_ptr; |
584f8b71 | 220 | |
b60c31d8 MN |
221 | slb_size_ptr = of_get_flat_dt_prop(node, "slb-size", NULL); |
222 | if (slb_size_ptr != NULL) { | |
dc0e643a | 223 | mmu_slb_size = be32_to_cpup(slb_size_ptr); |
b60c31d8 MN |
224 | return; |
225 | } | |
584f8b71 MN |
226 | slb_size_ptr = of_get_flat_dt_prop(node, "ibm,slb-size", NULL); |
227 | if (slb_size_ptr != NULL) { | |
dc0e643a | 228 | mmu_slb_size = be32_to_cpup(slb_size_ptr); |
584f8b71 MN |
229 | } |
230 | } | |
231 | #else | |
232 | #define check_cpu_slb_size(node) do { } while(0) | |
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; | |
260 | char *model = of_get_flat_dt_prop(node, "model", NULL); | |
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 | { |
4df20460 | 298 | char *type = of_get_flat_dt_prop(node, "device_type", NULL); |
dc0e643a IM |
299 | const __be32 *prop; |
300 | const __be32 *intserv; | |
4df20460 AB |
301 | int i, nthreads; |
302 | unsigned long 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); | |
312 | if (intserv) { | |
313 | nthreads = len / sizeof(int); | |
9b6b563c | 314 | } else { |
4df20460 AB |
315 | intserv = of_get_flat_dt_prop(node, "reg", NULL); |
316 | nthreads = 1; | |
317 | } | |
318 | ||
319 | /* | |
320 | * Now see if any of these threads match our boot cpu. | |
321 | * NOTE: This must match the parsing done in smp_setup_cpu_maps. | |
322 | */ | |
323 | for (i = 0; i < nthreads; i++) { | |
324 | /* | |
325 | * version 2 of the kexec param format adds the phys cpuid of | |
326 | * booted proc. | |
327 | */ | |
dc0e643a IM |
328 | if (be32_to_cpu(initial_boot_params->version) >= 2) { |
329 | if (be32_to_cpu(intserv[i]) == | |
330 | be32_to_cpu(initial_boot_params->boot_cpuid_phys)) { | |
9d07bc84 | 331 | found = boot_cpu_count; |
208b3a4c BH |
332 | found_thread = i; |
333 | } | |
4df20460 AB |
334 | } else { |
335 | /* | |
336 | * Check if it's the boot-cpu, set it's hw index now, | |
337 | * unfortunately this format did not support booting | |
338 | * off secondary threads. | |
339 | */ | |
340 | if (of_get_flat_dt_prop(node, | |
9d07bc84 BH |
341 | "linux,boot-cpu", NULL) != NULL) |
342 | found = boot_cpu_count; | |
9b6b563c | 343 | } |
4df20460 AB |
344 | #ifdef CONFIG_SMP |
345 | /* logical cpu id is always 0 on UP kernels */ | |
9d07bc84 | 346 | boot_cpu_count++; |
4df20460 AB |
347 | #endif |
348 | } | |
349 | ||
9d07bc84 BH |
350 | if (found >= 0) { |
351 | DBG("boot cpu: logical %d physical %d\n", found, | |
dc0e643a | 352 | be32_to_cpu(intserv[found_thread])); |
9d07bc84 | 353 | boot_cpuid = found; |
dc0e643a IM |
354 | set_hard_smp_processor_id(found, |
355 | be32_to_cpu(intserv[found_thread])); | |
9b6b563c | 356 | |
974a76f5 PM |
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); | |
dc0e643a IM |
372 | if (prop && (be32_to_cpup(prop) & 0xff000000) == 0x0f000000) |
373 | identify_cpu(0, be32_to_cpup(prop)); | |
14b3d926 VB |
374 | |
375 | identical_pvr_fixup(node); | |
9b6b563c | 376 | } |
9b6b563c | 377 | |
974a76f5 | 378 | check_cpu_feature_properties(node); |
d205819e | 379 | check_cpu_pa_features(node); |
584f8b71 | 380 | check_cpu_slb_size(node); |
d205819e | 381 | |
4a85b31d | 382 | #ifdef CONFIG_PPC64 |
4df20460 | 383 | if (nthreads > 1) |
9b6b563c | 384 | cur_cpu_spec->cpu_features |= CPU_FTR_SMT; |
4df20460 AB |
385 | else |
386 | cur_cpu_spec->cpu_features &= ~CPU_FTR_SMT; | |
9b6b563c PM |
387 | #endif |
388 | ||
389 | return 0; | |
390 | } | |
391 | ||
32c97689 GL |
392 | int __init early_init_dt_scan_chosen_ppc(unsigned long node, const char *uname, |
393 | int depth, void *data) | |
9b6b563c | 394 | { |
dc0e643a | 395 | unsigned long *lprop; /* All these set by kernel, so no need to convert endian */ |
9b6b563c | 396 | |
32c97689 GL |
397 | /* Use common scan routine to determine if this is the chosen node */ |
398 | if (early_init_dt_scan_chosen(node, uname, depth, data) == 0) | |
399 | return 0; | |
400 | ||
9b6b563c PM |
401 | #ifdef CONFIG_PPC64 |
402 | /* check if iommu is forced on or off */ | |
3c726f8d | 403 | if (of_get_flat_dt_prop(node, "linux,iommu-off", NULL) != NULL) |
9b6b563c | 404 | iommu_is_off = 1; |
3c726f8d | 405 | if (of_get_flat_dt_prop(node, "linux,iommu-force-on", NULL) != NULL) |
9b6b563c PM |
406 | iommu_force_on = 1; |
407 | #endif | |
408 | ||
2babf5c2 | 409 | /* mem=x on the command line is the preferred mechanism */ |
86e03221 GL |
410 | lprop = of_get_flat_dt_prop(node, "linux,memory-limit", NULL); |
411 | if (lprop) | |
412 | memory_limit = *lprop; | |
9b6b563c PM |
413 | |
414 | #ifdef CONFIG_PPC64 | |
86e03221 GL |
415 | lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-start", NULL); |
416 | if (lprop) | |
417 | tce_alloc_start = *lprop; | |
418 | lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-end", NULL); | |
419 | if (lprop) | |
420 | tce_alloc_end = *lprop; | |
9b6b563c PM |
421 | #endif |
422 | ||
dcee3036 | 423 | #ifdef CONFIG_KEXEC |
63277161 | 424 | lprop = of_get_flat_dt_prop(node, "linux,crashkernel-base", NULL); |
70c6cc37 LV |
425 | if (lprop) |
426 | crashk_res.start = *lprop; | |
dcee3036 | 427 | |
63277161 | 428 | lprop = of_get_flat_dt_prop(node, "linux,crashkernel-size", NULL); |
70c6cc37 LV |
429 | if (lprop) |
430 | crashk_res.end = crashk_res.start + *lprop - 1; | |
dcee3036 | 431 | #endif |
32c97689 GL |
432 | |
433 | /* break now */ | |
434 | return 1; | |
9b6b563c PM |
435 | } |
436 | ||
0204568a PM |
437 | #ifdef CONFIG_PPC_PSERIES |
438 | /* | |
439 | * Interpret the ibm,dynamic-memory property in the | |
440 | * /ibm,dynamic-reconfiguration-memory node. | |
441 | * This contains a list of memory blocks along with NUMA affinity | |
442 | * information. | |
443 | */ | |
444 | static int __init early_init_dt_scan_drconf_memory(unsigned long node) | |
445 | { | |
0f0b56c3 | 446 | __be32 *dm, *ls, *usm; |
abe76885 | 447 | unsigned long l, 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; | |
475 | /* skip this block if the reserved bit is set in flags (0x80) | |
476 | or if the block is not assigned to this partition (0x8) */ | |
477 | if ((flags & 0x80) || !(flags & 0x8)) | |
478 | continue; | |
95f72d1e | 479 | size = memblock_size; |
cf00085d C |
480 | rngs = 1; |
481 | if (is_kexec_kdump) { | |
482 | /* | |
95f72d1e | 483 | * For each memblock in ibm,dynamic-memory, a corresponding |
cf00085d C |
484 | * entry in linux,drconf-usable-memory property contains |
485 | * a counter 'p' followed by 'p' (base, size) duple. | |
486 | * Now read the counter from | |
487 | * linux,drconf-usable-memory property | |
488 | */ | |
489 | rngs = dt_mem_next_cell(dt_root_size_cells, &usm); | |
490 | if (!rngs) /* there are no (base, size) duple */ | |
0204568a | 491 | continue; |
0204568a | 492 | } |
cf00085d C |
493 | do { |
494 | if (is_kexec_kdump) { | |
495 | base = dt_mem_next_cell(dt_root_addr_cells, | |
496 | &usm); | |
497 | size = dt_mem_next_cell(dt_root_size_cells, | |
498 | &usm); | |
499 | } | |
500 | if (iommu_is_off) { | |
501 | if (base >= 0x80000000ul) | |
502 | continue; | |
503 | if ((base + size) > 0x80000000ul) | |
504 | size = 0x80000000ul - base; | |
505 | } | |
95f72d1e | 506 | memblock_add(base, size); |
cf00085d | 507 | } while (--rngs); |
0204568a | 508 | } |
95f72d1e | 509 | memblock_dump_all(); |
0204568a PM |
510 | return 0; |
511 | } | |
512 | #else | |
513 | #define early_init_dt_scan_drconf_memory(node) 0 | |
514 | #endif /* CONFIG_PPC_PSERIES */ | |
9b6b563c | 515 | |
51975db0 GL |
516 | static int __init early_init_dt_scan_memory_ppc(unsigned long node, |
517 | const char *uname, | |
518 | int depth, void *data) | |
9b6b563c | 519 | { |
0204568a PM |
520 | if (depth == 1 && |
521 | strcmp(uname, "ibm,dynamic-reconfiguration-memory") == 0) | |
522 | return early_init_dt_scan_drconf_memory(node); | |
51975db0 GL |
523 | |
524 | return early_init_dt_scan_memory(node, uname, depth, data); | |
525 | } | |
0204568a | 526 | |
b27652dd KH |
527 | /* |
528 | * For a relocatable kernel, we need to get the memstart_addr first, | |
529 | * then use it to calculate the virtual kernel start address. This has | |
530 | * to happen at a very early stage (before machine_init). In this case, | |
531 | * we just want to get the memstart_address and would not like to mess the | |
532 | * memblock at this stage. So introduce a variable to skip the memblock_add() | |
533 | * for this reason. | |
534 | */ | |
535 | #ifdef CONFIG_RELOCATABLE | |
536 | static int add_mem_to_memblock = 1; | |
537 | #else | |
538 | #define add_mem_to_memblock 1 | |
539 | #endif | |
540 | ||
51975db0 GL |
541 | void __init early_init_dt_add_memory_arch(u64 base, u64 size) |
542 | { | |
cd3db0c4 | 543 | #ifdef CONFIG_PPC64 |
51975db0 GL |
544 | if (iommu_is_off) { |
545 | if (base >= 0x80000000ul) | |
546 | return; | |
547 | if ((base + size) > 0x80000000ul) | |
548 | size = 0x80000000ul - base; | |
549 | } | |
9b6b563c | 550 | #endif |
03bf469a BH |
551 | /* Keep track of the beginning of memory -and- the size of |
552 | * the very first block in the device-tree as it represents | |
553 | * the RMA on ppc64 server | |
554 | */ | |
555 | if (base < memstart_addr) { | |
556 | memstart_addr = base; | |
557 | first_memblock_size = size; | |
558 | } | |
cd3db0c4 BH |
559 | |
560 | /* Add the chunk to the MEMBLOCK list */ | |
b27652dd KH |
561 | if (add_mem_to_memblock) |
562 | memblock_add(base, size); | |
9b6b563c PM |
563 | } |
564 | ||
c039e3a8 | 565 | static void __init early_reserve_mem_dt(void) |
0962e800 JK |
566 | { |
567 | unsigned long i, len, dt_root; | |
568 | const __be32 *prop; | |
569 | ||
570 | dt_root = of_get_flat_dt_root(); | |
571 | ||
572 | prop = of_get_flat_dt_prop(dt_root, "reserved-ranges", &len); | |
573 | ||
574 | if (!prop) | |
c039e3a8 BH |
575 | return; |
576 | ||
577 | DBG("Found new-style reserved-ranges\n"); | |
0962e800 JK |
578 | |
579 | /* Each reserved range is an (address,size) pair, 2 cells each, | |
580 | * totalling 4 cells per range. */ | |
581 | for (i = 0; i < len / (sizeof(*prop) * 4); i++) { | |
582 | u64 base, size; | |
583 | ||
584 | base = of_read_number(prop + (i * 4) + 0, 2); | |
585 | size = of_read_number(prop + (i * 4) + 2, 2); | |
586 | ||
c039e3a8 BH |
587 | if (size) { |
588 | DBG("reserving: %llx -> %llx\n", base, size); | |
0962e800 | 589 | memblock_reserve(base, size); |
c039e3a8 | 590 | } |
0962e800 | 591 | } |
708b7eef MS |
592 | |
593 | early_init_fdt_scan_reserved_mem(); | |
0962e800 JK |
594 | } |
595 | ||
9b6b563c PM |
596 | static void __init early_reserve_mem(void) |
597 | { | |
cbbcf340 | 598 | u64 base, size; |
dc0e643a | 599 | __be64 *reserve_map; |
8a300887 JL |
600 | unsigned long self_base; |
601 | unsigned long self_size; | |
9b6b563c | 602 | |
dc0e643a IM |
603 | reserve_map = (__be64 *)(((unsigned long)initial_boot_params) + |
604 | be32_to_cpu(initial_boot_params->off_mem_rsvmap)); | |
4d1f3f25 JX |
605 | |
606 | /* before we do anything, lets reserve the dt blob */ | |
8a300887 | 607 | self_base = __pa((unsigned long)initial_boot_params); |
dc0e643a | 608 | self_size = be32_to_cpu(initial_boot_params->totalsize); |
95f72d1e | 609 | memblock_reserve(self_base, self_size); |
4d1f3f25 | 610 | |
c039e3a8 BH |
611 | /* Look for the new "reserved-regions" property in the DT */ |
612 | early_reserve_mem_dt(); | |
0962e800 | 613 | |
30437b3e | 614 | #ifdef CONFIG_BLK_DEV_INITRD |
c039e3a8 BH |
615 | /* Then reserve the initrd, if any */ |
616 | if (initrd_start && (initrd_end > initrd_start)) { | |
307cfe71 BH |
617 | memblock_reserve(_ALIGN_DOWN(__pa(initrd_start), PAGE_SIZE), |
618 | _ALIGN_UP(initrd_end, PAGE_SIZE) - | |
619 | _ALIGN_DOWN(initrd_start, PAGE_SIZE)); | |
c039e3a8 | 620 | } |
30437b3e DG |
621 | #endif /* CONFIG_BLK_DEV_INITRD */ |
622 | ||
cbbcf340 KG |
623 | #ifdef CONFIG_PPC32 |
624 | /* | |
625 | * Handle the case where we might be booting from an old kexec | |
626 | * image that setup the mem_rsvmap as pairs of 32-bit values | |
627 | */ | |
dc0e643a | 628 | if (be64_to_cpup(reserve_map) > 0xffffffffull) { |
cbbcf340 | 629 | u32 base_32, size_32; |
dc0e643a | 630 | __be32 *reserve_map_32 = (__be32 *)reserve_map; |
cbbcf340 | 631 | |
c039e3a8 BH |
632 | DBG("Found old 32-bit reserve map\n"); |
633 | ||
cbbcf340 | 634 | while (1) { |
dc0e643a IM |
635 | base_32 = be32_to_cpup(reserve_map_32++); |
636 | size_32 = be32_to_cpup(reserve_map_32++); | |
cbbcf340 KG |
637 | if (size_32 == 0) |
638 | break; | |
8a300887 JL |
639 | /* skip if the reservation is for the blob */ |
640 | if (base_32 == self_base && size_32 == self_size) | |
641 | continue; | |
329dda08 | 642 | DBG("reserving: %x -> %x\n", base_32, size_32); |
95f72d1e | 643 | memblock_reserve(base_32, size_32); |
cbbcf340 KG |
644 | } |
645 | return; | |
646 | } | |
647 | #endif | |
c039e3a8 BH |
648 | DBG("Processing reserve map\n"); |
649 | ||
650 | /* Handle the reserve map in the fdt blob if it exists */ | |
9b6b563c | 651 | while (1) { |
dc0e643a IM |
652 | base = be64_to_cpup(reserve_map++); |
653 | size = be64_to_cpup(reserve_map++); | |
9b6b563c PM |
654 | if (size == 0) |
655 | break; | |
cbbcf340 | 656 | DBG("reserving: %llx -> %llx\n", base, size); |
95f72d1e | 657 | memblock_reserve(base, size); |
9b6b563c | 658 | } |
9b6b563c PM |
659 | } |
660 | ||
661 | void __init early_init_devtree(void *params) | |
662 | { | |
49a84965 | 663 | phys_addr_t limit; |
6ca4f749 | 664 | |
44348105 | 665 | DBG(" -> early_init_devtree(%p)\n", params); |
9b6b563c PM |
666 | |
667 | /* Setup flat device-tree pointer */ | |
668 | initial_boot_params = params; | |
669 | ||
458148c0 ME |
670 | #ifdef CONFIG_PPC_RTAS |
671 | /* Some machines might need RTAS info for debugging, grab it now. */ | |
672 | of_scan_flat_dt(early_init_dt_scan_rtas, NULL); | |
673 | #endif | |
674 | ||
14a43e69 BH |
675 | #ifdef CONFIG_PPC_POWERNV |
676 | /* Some machines might need OPAL info for debugging, grab it now. */ | |
677 | of_scan_flat_dt(early_init_dt_scan_opal, NULL); | |
678 | #endif | |
679 | ||
eb39c880 MS |
680 | #ifdef CONFIG_FA_DUMP |
681 | /* scan tree to see if dump is active during last boot */ | |
682 | of_scan_flat_dt(early_init_dt_scan_fw_dump, NULL); | |
683 | #endif | |
684 | ||
817c21ad BH |
685 | /* Pre-initialize the cmd_line with the content of boot_commmand_line, |
686 | * which will be empty except when the content of the variable has | |
687 | * been overriden by a bootloading mechanism. This happens typically | |
688 | * with HAL takeover | |
689 | */ | |
690 | strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE); | |
691 | ||
9b6b563c PM |
692 | /* Retrieve various informations from the /chosen node of the |
693 | * device-tree, including the platform type, initrd location and | |
694 | * size, TCE reserve, and more ... | |
695 | */ | |
85f60ae4 | 696 | of_scan_flat_dt(early_init_dt_scan_chosen_ppc, cmd_line); |
9b6b563c | 697 | |
95f72d1e | 698 | /* Scan memory nodes and rebuild MEMBLOCKs */ |
3c726f8d | 699 | of_scan_flat_dt(early_init_dt_scan_root, NULL); |
51975db0 | 700 | of_scan_flat_dt(early_init_dt_scan_memory_ppc, NULL); |
846f77b0 ME |
701 | |
702 | /* Save command line for /proc/cmdline and then parse parameters */ | |
b8757b21 | 703 | strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE); |
846f77b0 ME |
704 | parse_early_param(); |
705 | ||
ba14f649 KG |
706 | /* make sure we've parsed cmdline for mem= before this */ |
707 | if (memory_limit) | |
a84fcd46 | 708 | first_memblock_size = min_t(u64, first_memblock_size, memory_limit); |
ba14f649 | 709 | setup_initial_memory_limit(memstart_addr, first_memblock_size); |
95f72d1e YL |
710 | /* Reserve MEMBLOCK regions used by kernel, initrd, dt, etc... */ |
711 | memblock_reserve(PHYSICAL_START, __pa(klimit) - PHYSICAL_START); | |
549e8152 PM |
712 | /* If relocatable, reserve first 32k for interrupt vectors etc. */ |
713 | if (PHYSICAL_START > MEMORY_START) | |
95f72d1e | 714 | memblock_reserve(MEMORY_START, 0x8000); |
47310413 | 715 | reserve_kdump_trampoline(); |
eb39c880 MS |
716 | #ifdef CONFIG_FA_DUMP |
717 | /* | |
718 | * If we fail to reserve memory for firmware-assisted dump then | |
719 | * fallback to kexec based kdump. | |
720 | */ | |
721 | if (fadump_reserve_mem() == 0) | |
722 | #endif | |
723 | reserve_crashkernel(); | |
9b6b563c PM |
724 | early_reserve_mem(); |
725 | ||
6fbef13c TH |
726 | /* |
727 | * Ensure that total memory size is page-aligned, because otherwise | |
728 | * mark_bootmem() gets upset. | |
729 | */ | |
6fbef13c | 730 | limit = ALIGN(memory_limit ?: memblock_phys_mem_size(), PAGE_SIZE); |
95f72d1e | 731 | memblock_enforce_memory_limit(limit); |
6ca4f749 | 732 | |
1aadc056 | 733 | memblock_allow_resize(); |
95f72d1e | 734 | memblock_dump_all(); |
2babf5c2 | 735 | |
95f72d1e | 736 | DBG("Phys. mem: %llx\n", memblock_phys_mem_size()); |
2babf5c2 ME |
737 | |
738 | /* We may need to relocate the flat tree, do it now. | |
739 | * FIXME .. and the initrd too? */ | |
740 | move_device_tree(); | |
741 | ||
1426d5a3 ME |
742 | allocate_pacas(); |
743 | ||
9b6b563c PM |
744 | DBG("Scanning CPUs ...\n"); |
745 | ||
25985edc | 746 | /* Retrieve CPU related informations from the flat tree |
3c726f8d | 747 | * (altivec support, boot CPU ID, ...) |
9b6b563c | 748 | */ |
3c726f8d | 749 | of_scan_flat_dt(early_init_dt_scan_cpus, NULL); |
9b6b563c | 750 | |
7ac87abb ME |
751 | #if defined(CONFIG_SMP) && defined(CONFIG_PPC64) |
752 | /* We'll later wait for secondaries to check in; there are | |
753 | * NCPUS-1 non-boot CPUs :-) | |
754 | */ | |
755 | spinning_secondaries = boot_cpu_count - 1; | |
756 | #endif | |
757 | ||
55672ecf MS |
758 | #ifdef CONFIG_PPC_POWERNV |
759 | /* Scan and build the list of machine check recoverable ranges */ | |
760 | of_scan_flat_dt(early_init_dt_scan_recoverable_ranges, NULL); | |
761 | #endif | |
762 | ||
9b6b563c PM |
763 | DBG(" <- early_init_devtree()\n"); |
764 | } | |
765 | ||
b27652dd KH |
766 | #ifdef CONFIG_RELOCATABLE |
767 | /* | |
768 | * This function run before early_init_devtree, so we have to init | |
769 | * initial_boot_params. | |
770 | */ | |
771 | void __init early_get_first_memblock_info(void *params, phys_addr_t *size) | |
772 | { | |
773 | /* Setup flat device-tree pointer */ | |
774 | initial_boot_params = params; | |
775 | ||
776 | /* | |
777 | * Scan the memory nodes and set add_mem_to_memblock to 0 to avoid | |
778 | * mess the memblock. | |
779 | */ | |
780 | add_mem_to_memblock = 0; | |
781 | of_scan_flat_dt(early_init_dt_scan_root, NULL); | |
782 | of_scan_flat_dt(early_init_dt_scan_memory_ppc, NULL); | |
783 | add_mem_to_memblock = 1; | |
784 | ||
785 | if (size) | |
786 | *size = first_memblock_size; | |
787 | } | |
788 | #endif | |
789 | ||
9b6b563c PM |
790 | /******* |
791 | * | |
792 | * New implementation of the OF "find" APIs, return a refcounted | |
793 | * object, call of_node_put() when done. The device tree and list | |
794 | * are protected by a rw_lock. | |
795 | * | |
796 | * Note that property management will need some locking as well, | |
797 | * this isn't dealt with yet. | |
798 | * | |
799 | *******/ | |
800 | ||
b37193b7 BH |
801 | /** |
802 | * of_get_ibm_chip_id - Returns the IBM "chip-id" of a device | |
803 | * @np: device node of the device | |
804 | * | |
805 | * This looks for a property "ibm,chip-id" in the node or any | |
806 | * of its parents and returns its content, or -1 if it cannot | |
807 | * be found. | |
808 | */ | |
809 | int of_get_ibm_chip_id(struct device_node *np) | |
810 | { | |
811 | of_node_get(np); | |
812 | while(np) { | |
813 | struct device_node *old = np; | |
814 | const __be32 *prop; | |
815 | ||
816 | prop = of_get_property(np, "ibm,chip-id", NULL); | |
817 | if (prop) { | |
818 | of_node_put(np); | |
819 | return be32_to_cpup(prop); | |
820 | } | |
821 | np = of_get_parent(np); | |
822 | of_node_put(old); | |
823 | } | |
824 | return -1; | |
825 | } | |
826 | ||
3eb906c6 ME |
827 | /** |
828 | * cpu_to_chip_id - Return the cpus chip-id | |
829 | * @cpu: The logical cpu number. | |
830 | * | |
831 | * Return the value of the ibm,chip-id property corresponding to the given | |
832 | * logical cpu number. If the chip-id can not be found, returns -1. | |
833 | */ | |
834 | int cpu_to_chip_id(int cpu) | |
835 | { | |
836 | struct device_node *np; | |
837 | ||
838 | np = of_get_cpu_node(cpu, NULL); | |
839 | if (!np) | |
840 | return -1; | |
841 | ||
842 | of_node_put(np); | |
843 | return of_get_ibm_chip_id(np); | |
844 | } | |
845 | EXPORT_SYMBOL(cpu_to_chip_id); | |
846 | ||
9b6b563c PM |
847 | #ifdef CONFIG_PPC_PSERIES |
848 | /* | |
849 | * Fix up the uninitialized fields in a new device node: | |
0ebfff14 | 850 | * name, type and pci-specific fields |
9b6b563c PM |
851 | */ |
852 | ||
cc5d0189 | 853 | static int of_finish_dynamic_node(struct device_node *node) |
9b6b563c PM |
854 | { |
855 | struct device_node *parent = of_get_parent(node); | |
856 | int err = 0; | |
a7f67bdf | 857 | const phandle *ibm_phandle; |
9b6b563c | 858 | |
0e56efc7 SR |
859 | node->name = of_get_property(node, "name", NULL); |
860 | node->type = of_get_property(node, "device_type", NULL); | |
9b6b563c | 861 | |
847f5976 BH |
862 | if (!node->name) |
863 | node->name = "<NULL>"; | |
864 | if (!node->type) | |
865 | node->type = "<NULL>"; | |
866 | ||
9b6b563c PM |
867 | if (!parent) { |
868 | err = -ENODEV; | |
869 | goto out; | |
870 | } | |
871 | ||
872 | /* We don't support that function on PowerMac, at least | |
873 | * not yet | |
874 | */ | |
e8222502 | 875 | if (machine_is(powermac)) |
9b6b563c PM |
876 | return -ENODEV; |
877 | ||
6016a363 | 878 | /* fix up new node's phandle field */ |
0e56efc7 | 879 | if ((ibm_phandle = of_get_property(node, "ibm,phandle", NULL))) |
6016a363 | 880 | node->phandle = *ibm_phandle; |
9b6b563c PM |
881 | |
882 | out: | |
883 | of_node_put(parent); | |
884 | return err; | |
885 | } | |
886 | ||
887 | static int prom_reconfig_notifier(struct notifier_block *nb, | |
888 | unsigned long action, void *node) | |
889 | { | |
890 | int err; | |
891 | ||
892 | switch (action) { | |
1cf3d8b3 | 893 | case OF_RECONFIG_ATTACH_NODE: |
cc5d0189 | 894 | err = of_finish_dynamic_node(node); |
de2780a3 | 895 | if (err < 0) |
9b6b563c | 896 | printk(KERN_ERR "finish_node returned %d\n", err); |
9b6b563c PM |
897 | break; |
898 | default: | |
de2780a3 | 899 | err = 0; |
9b6b563c PM |
900 | break; |
901 | } | |
de2780a3 | 902 | return notifier_from_errno(err); |
9b6b563c PM |
903 | } |
904 | ||
905 | static struct notifier_block prom_reconfig_nb = { | |
906 | .notifier_call = prom_reconfig_notifier, | |
907 | .priority = 10, /* This one needs to run first */ | |
908 | }; | |
909 | ||
910 | static int __init prom_reconfig_setup(void) | |
911 | { | |
1cf3d8b3 | 912 | return of_reconfig_notifier_register(&prom_reconfig_nb); |
9b6b563c PM |
913 | } |
914 | __initcall(prom_reconfig_setup); | |
915 | #endif | |
916 | ||
819d5965 SH |
917 | bool arch_match_cpu_phys_id(int cpu, u64 phys_id) |
918 | { | |
919 | return (int)phys_id == get_hard_smp_processor_id(cpu); | |
920 | } | |
921 | ||
94a3807c | 922 | #if defined(CONFIG_DEBUG_FS) && defined(DEBUG) |
7a4571ae ME |
923 | static struct debugfs_blob_wrapper flat_dt_blob; |
924 | ||
925 | static int __init export_flat_device_tree(void) | |
926 | { | |
927 | struct dentry *d; | |
928 | ||
7a4571ae | 929 | flat_dt_blob.data = initial_boot_params; |
dc0e643a | 930 | flat_dt_blob.size = be32_to_cpu(initial_boot_params->totalsize); |
7a4571ae ME |
931 | |
932 | d = debugfs_create_blob("flat-device-tree", S_IFREG | S_IRUSR, | |
94a3807c | 933 | powerpc_debugfs_root, &flat_dt_blob); |
7a4571ae ME |
934 | if (!d) |
935 | return 1; | |
936 | ||
937 | return 0; | |
938 | } | |
939 | __initcall(export_flat_device_tree); | |
940 | #endif |