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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> |
7f92bc56 | 37 | #include <linux/cpu.h> |
9b6b563c PM |
38 | |
39 | #include <asm/prom.h> | |
40 | #include <asm/rtas.h> | |
9b6b563c PM |
41 | #include <asm/page.h> |
42 | #include <asm/processor.h> | |
43 | #include <asm/irq.h> | |
44 | #include <asm/io.h> | |
0cc4746c | 45 | #include <asm/kdump.h> |
9b6b563c | 46 | #include <asm/smp.h> |
9b6b563c | 47 | #include <asm/mmu.h> |
1426d5a3 | 48 | #include <asm/paca.h> |
9b6b563c | 49 | #include <asm/pgtable.h> |
9b6b563c PM |
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> |
da6a97bf | 59 | #include <asm/epapr_hcalls.h> |
3808a889 | 60 | #include <asm/firmware.h> |
14a43e69 | 61 | |
37dd2bad | 62 | #include <mm/mmu_decl.h> |
9b6b563c PM |
63 | |
64 | #ifdef DEBUG | |
65 | #define DBG(fmt...) printk(KERN_ERR fmt) | |
66 | #else | |
67 | #define DBG(fmt...) | |
68 | #endif | |
69 | ||
9b6b563c | 70 | #ifdef CONFIG_PPC64 |
28897731 | 71 | int __initdata iommu_is_off; |
9b6b563c | 72 | int __initdata iommu_force_on; |
cf00a8d1 | 73 | unsigned long tce_alloc_start, tce_alloc_end; |
cd3db0c4 | 74 | u64 ppc64_rma_size; |
9b6b563c | 75 | #endif |
03bf469a | 76 | static phys_addr_t first_memblock_size; |
7ac87abb | 77 | static int __initdata boot_cpu_count; |
9b6b563c | 78 | |
2babf5c2 ME |
79 | static int __init early_parse_mem(char *p) |
80 | { | |
81 | if (!p) | |
82 | return 1; | |
83 | ||
84 | memory_limit = PAGE_ALIGN(memparse(p, &p)); | |
a84fcd46 | 85 | DBG("memory limit = 0x%llx\n", memory_limit); |
2babf5c2 ME |
86 | |
87 | return 0; | |
88 | } | |
89 | early_param("mem", early_parse_mem); | |
90 | ||
307cfe71 BH |
91 | /* |
92 | * overlaps_initrd - check for overlap with page aligned extension of | |
93 | * initrd. | |
94 | */ | |
95 | static inline int overlaps_initrd(unsigned long start, unsigned long size) | |
96 | { | |
97 | #ifdef CONFIG_BLK_DEV_INITRD | |
98 | if (!initrd_start) | |
99 | return 0; | |
100 | ||
101 | return (start + size) > _ALIGN_DOWN(initrd_start, PAGE_SIZE) && | |
102 | start <= _ALIGN_UP(initrd_end, PAGE_SIZE); | |
103 | #else | |
104 | return 0; | |
105 | #endif | |
106 | } | |
107 | ||
3c607ce2 LV |
108 | /** |
109 | * move_device_tree - move tree to an unused area, if needed. | |
110 | * | |
111 | * The device tree may be allocated beyond our memory limit, or inside the | |
307cfe71 BH |
112 | * crash kernel region for kdump, or within the page aligned range of initrd. |
113 | * If so, move it out of the way. | |
2babf5c2 | 114 | */ |
18f032cb | 115 | static void __init move_device_tree(void) |
2babf5c2 ME |
116 | { |
117 | unsigned long start, size; | |
118 | void *p; | |
119 | ||
120 | DBG("-> move_device_tree\n"); | |
121 | ||
122 | start = __pa(initial_boot_params); | |
060f78c2 | 123 | size = fdt_totalsize(initial_boot_params); |
2babf5c2 | 124 | |
6dd22700 | 125 | if ((memory_limit && (start + size) > PHYSICAL_START + memory_limit) || |
307cfe71 BH |
126 | overlaps_crashkernel(start, size) || |
127 | overlaps_initrd(start, size)) { | |
e63075a3 | 128 | p = __va(memblock_alloc(size, PAGE_SIZE)); |
2babf5c2 | 129 | memcpy(p, initial_boot_params, size); |
060f78c2 | 130 | initial_boot_params = p; |
2babf5c2 ME |
131 | DBG("Moved device tree to 0x%p\n", p); |
132 | } | |
133 | ||
134 | DBG("<- move_device_tree\n"); | |
135 | } | |
9b6b563c | 136 | |
d205819e PM |
137 | /* |
138 | * ibm,pa-features is a per-cpu property that contains a string of | |
139 | * attribute descriptors, each of which has a 2 byte header plus up | |
140 | * to 254 bytes worth of processor attribute bits. First header | |
141 | * byte specifies the number of bytes following the header. | |
142 | * Second header byte is an "attribute-specifier" type, of which | |
143 | * zero is the only currently-defined value. | |
144 | * Implementation: Pass in the byte and bit offset for the feature | |
145 | * that we are interested in. The function will return -1 if the | |
146 | * pa-features property is missing, or a 1/0 to indicate if the feature | |
147 | * is supported/not supported. Note that the bit numbers are | |
148 | * big-endian to match the definition in PAPR. | |
149 | */ | |
150 | static struct ibm_pa_feature { | |
151 | unsigned long cpu_features; /* CPU_FTR_xxx bit */ | |
44ae3ab3 | 152 | unsigned long mmu_features; /* MMU_FTR_xxx bit */ |
d205819e | 153 | unsigned int cpu_user_ftrs; /* PPC_FEATURE_xxx bit */ |
beff8237 | 154 | unsigned int cpu_user_ftrs2; /* PPC_FEATURE2_xxx bit */ |
d205819e PM |
155 | unsigned char pabyte; /* byte number in ibm,pa-features */ |
156 | unsigned char pabit; /* bit number (big-endian) */ | |
157 | unsigned char invert; /* if 1, pa bit set => clear feature */ | |
158 | } ibm_pa_features[] __initdata = { | |
e9eb0278 ME |
159 | { .pabyte = 0, .pabit = 0, .cpu_user_ftrs = PPC_FEATURE_HAS_MMU }, |
160 | { .pabyte = 0, .pabit = 1, .cpu_user_ftrs = PPC_FEATURE_HAS_FPU }, | |
161 | { .pabyte = 0, .pabit = 3, .cpu_features = CPU_FTR_CTRL }, | |
162 | { .pabyte = 0, .pabit = 6, .cpu_features = CPU_FTR_NOEXECUTE }, | |
163 | { .pabyte = 1, .pabit = 2, .mmu_features = MMU_FTR_CI_LARGE_PAGE }, | |
164 | { .pabyte = 40, .pabit = 0, .mmu_features = MMU_FTR_TYPE_RADIX }, | |
165 | { .pabyte = 1, .pabit = 1, .invert = 1, .cpu_features = CPU_FTR_NODSISRALIGN }, | |
166 | { .pabyte = 5, .pabit = 0, .cpu_features = CPU_FTR_REAL_LE, | |
167 | .cpu_user_ftrs = PPC_FEATURE_TRUE_LE }, | |
9e819963 | 168 | /* |
4705e024 AB |
169 | * If the kernel doesn't support TM (ie CONFIG_PPC_TRANSACTIONAL_MEM=n), |
170 | * we don't want to turn on TM here, so we use the *_COMP versions | |
171 | * which are 0 if the kernel doesn't support TM. | |
9e819963 | 172 | */ |
e9eb0278 ME |
173 | { .pabyte = 22, .pabit = 0, .cpu_features = CPU_FTR_TM_COMP, |
174 | .cpu_user_ftrs2 = PPC_FEATURE2_HTM_COMP | PPC_FEATURE2_HTM_NOSC_COMP }, | |
d205819e PM |
175 | }; |
176 | ||
9d0c4dfe | 177 | static void __init scan_features(unsigned long node, const unsigned char *ftrs, |
974a76f5 PM |
178 | unsigned long tablelen, |
179 | struct ibm_pa_feature *fp, | |
180 | unsigned long ft_size) | |
d205819e | 181 | { |
974a76f5 | 182 | unsigned long i, len, bit; |
d205819e PM |
183 | |
184 | /* find descriptor with type == 0 */ | |
185 | for (;;) { | |
186 | if (tablelen < 3) | |
187 | return; | |
974a76f5 | 188 | len = 2 + ftrs[0]; |
d205819e PM |
189 | if (tablelen < len) |
190 | return; /* descriptor 0 not found */ | |
974a76f5 | 191 | if (ftrs[1] == 0) |
d205819e PM |
192 | break; |
193 | tablelen -= len; | |
974a76f5 | 194 | ftrs += len; |
d205819e PM |
195 | } |
196 | ||
197 | /* loop over bits we know about */ | |
974a76f5 PM |
198 | for (i = 0; i < ft_size; ++i, ++fp) { |
199 | if (fp->pabyte >= ftrs[0]) | |
d205819e | 200 | continue; |
974a76f5 | 201 | bit = (ftrs[2 + fp->pabyte] >> (7 - fp->pabit)) & 1; |
d205819e PM |
202 | if (bit ^ fp->invert) { |
203 | cur_cpu_spec->cpu_features |= fp->cpu_features; | |
204 | cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftrs; | |
beff8237 | 205 | cur_cpu_spec->cpu_user_features2 |= fp->cpu_user_ftrs2; |
44ae3ab3 | 206 | cur_cpu_spec->mmu_features |= fp->mmu_features; |
d205819e PM |
207 | } else { |
208 | cur_cpu_spec->cpu_features &= ~fp->cpu_features; | |
209 | cur_cpu_spec->cpu_user_features &= ~fp->cpu_user_ftrs; | |
beff8237 | 210 | cur_cpu_spec->cpu_user_features2 &= ~fp->cpu_user_ftrs2; |
44ae3ab3 | 211 | cur_cpu_spec->mmu_features &= ~fp->mmu_features; |
d205819e PM |
212 | } |
213 | } | |
214 | } | |
215 | ||
974a76f5 PM |
216 | static void __init check_cpu_pa_features(unsigned long node) |
217 | { | |
9d0c4dfe RH |
218 | const unsigned char *pa_ftrs; |
219 | int tablelen; | |
974a76f5 PM |
220 | |
221 | pa_ftrs = of_get_flat_dt_prop(node, "ibm,pa-features", &tablelen); | |
222 | if (pa_ftrs == NULL) | |
223 | return; | |
224 | ||
225 | scan_features(node, pa_ftrs, tablelen, | |
226 | ibm_pa_features, ARRAY_SIZE(ibm_pa_features)); | |
227 | } | |
228 | ||
94491685 | 229 | #ifdef CONFIG_PPC_STD_MMU_64 |
9c61f7a0 | 230 | static void __init init_mmu_slb_size(unsigned long node) |
584f8b71 | 231 | { |
9d0c4dfe | 232 | const __be32 *slb_size_ptr; |
584f8b71 | 233 | |
9c61f7a0 AK |
234 | slb_size_ptr = of_get_flat_dt_prop(node, "slb-size", NULL) ? : |
235 | of_get_flat_dt_prop(node, "ibm,slb-size", NULL); | |
236 | ||
237 | if (slb_size_ptr) | |
dc0e643a | 238 | mmu_slb_size = be32_to_cpup(slb_size_ptr); |
584f8b71 MN |
239 | } |
240 | #else | |
9c61f7a0 | 241 | #define init_mmu_slb_size(node) do { } while(0) |
584f8b71 MN |
242 | #endif |
243 | ||
974a76f5 PM |
244 | static struct feature_property { |
245 | const char *name; | |
246 | u32 min_value; | |
247 | unsigned long cpu_feature; | |
248 | unsigned long cpu_user_ftr; | |
249 | } feature_properties[] __initdata = { | |
250 | #ifdef CONFIG_ALTIVEC | |
251 | {"altivec", 0, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC}, | |
252 | {"ibm,vmx", 1, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC}, | |
253 | #endif /* CONFIG_ALTIVEC */ | |
b962ce9d MN |
254 | #ifdef CONFIG_VSX |
255 | /* Yes, this _really_ is ibm,vmx == 2 to enable VSX */ | |
256 | {"ibm,vmx", 2, CPU_FTR_VSX, PPC_FEATURE_HAS_VSX}, | |
257 | #endif /* CONFIG_VSX */ | |
974a76f5 PM |
258 | #ifdef CONFIG_PPC64 |
259 | {"ibm,dfp", 1, 0, PPC_FEATURE_HAS_DFP}, | |
260 | {"ibm,purr", 1, CPU_FTR_PURR, 0}, | |
261 | {"ibm,spurr", 1, CPU_FTR_SPURR, 0}, | |
262 | #endif /* CONFIG_PPC64 */ | |
263 | }; | |
264 | ||
14b3d926 VB |
265 | #if defined(CONFIG_44x) && defined(CONFIG_PPC_FPU) |
266 | static inline void identical_pvr_fixup(unsigned long node) | |
267 | { | |
268 | unsigned int pvr; | |
9d0c4dfe | 269 | const char *model = of_get_flat_dt_prop(node, "model", NULL); |
14b3d926 VB |
270 | |
271 | /* | |
272 | * Since 440GR(x)/440EP(x) processors have the same pvr, | |
273 | * we check the node path and set bit 28 in the cur_cpu_spec | |
274 | * pvr for EP(x) processor version. This bit is always 0 in | |
275 | * the "real" pvr. Then we call identify_cpu again with | |
276 | * the new logical pvr to enable FPU support. | |
277 | */ | |
278 | if (model && strstr(model, "440EP")) { | |
279 | pvr = cur_cpu_spec->pvr_value | 0x8; | |
280 | identify_cpu(0, pvr); | |
281 | DBG("Using logical pvr %x for %s\n", pvr, model); | |
282 | } | |
283 | } | |
284 | #else | |
285 | #define identical_pvr_fixup(node) do { } while(0) | |
286 | #endif | |
287 | ||
974a76f5 PM |
288 | static void __init check_cpu_feature_properties(unsigned long node) |
289 | { | |
290 | unsigned long i; | |
291 | struct feature_property *fp = feature_properties; | |
dc0e643a | 292 | const __be32 *prop; |
974a76f5 PM |
293 | |
294 | for (i = 0; i < ARRAY_SIZE(feature_properties); ++i, ++fp) { | |
295 | prop = of_get_flat_dt_prop(node, fp->name, NULL); | |
dc0e643a | 296 | if (prop && be32_to_cpup(prop) >= fp->min_value) { |
974a76f5 PM |
297 | cur_cpu_spec->cpu_features |= fp->cpu_feature; |
298 | cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftr; | |
299 | } | |
300 | } | |
301 | } | |
302 | ||
9b6b563c | 303 | static int __init early_init_dt_scan_cpus(unsigned long node, |
4df20460 AB |
304 | const char *uname, int depth, |
305 | void *data) | |
9b6b563c | 306 | { |
9d0c4dfe | 307 | const char *type = of_get_flat_dt_prop(node, "device_type", NULL); |
dc0e643a IM |
308 | const __be32 *prop; |
309 | const __be32 *intserv; | |
4df20460 | 310 | int i, nthreads; |
9d0c4dfe | 311 | int len; |
9d07bc84 | 312 | int found = -1; |
208b3a4c | 313 | int found_thread = 0; |
9b6b563c PM |
314 | |
315 | /* We are scanning "cpu" nodes only */ | |
316 | if (type == NULL || strcmp(type, "cpu") != 0) | |
317 | return 0; | |
318 | ||
4df20460 AB |
319 | /* Get physical cpuid */ |
320 | intserv = of_get_flat_dt_prop(node, "ibm,ppc-interrupt-server#s", &len); | |
e16c8765 AF |
321 | if (!intserv) |
322 | intserv = of_get_flat_dt_prop(node, "reg", &len); | |
323 | ||
324 | nthreads = len / sizeof(int); | |
4df20460 AB |
325 | |
326 | /* | |
327 | * Now see if any of these threads match our boot cpu. | |
328 | * NOTE: This must match the parsing done in smp_setup_cpu_maps. | |
329 | */ | |
330 | for (i = 0; i < nthreads; i++) { | |
331 | /* | |
332 | * version 2 of the kexec param format adds the phys cpuid of | |
333 | * booted proc. | |
334 | */ | |
060f78c2 | 335 | if (fdt_version(initial_boot_params) >= 2) { |
dc0e643a | 336 | if (be32_to_cpu(intserv[i]) == |
060f78c2 | 337 | fdt_boot_cpuid_phys(initial_boot_params)) { |
9d07bc84 | 338 | found = boot_cpu_count; |
208b3a4c BH |
339 | found_thread = i; |
340 | } | |
4df20460 AB |
341 | } else { |
342 | /* | |
343 | * Check if it's the boot-cpu, set it's hw index now, | |
344 | * unfortunately this format did not support booting | |
345 | * off secondary threads. | |
346 | */ | |
347 | if (of_get_flat_dt_prop(node, | |
9d07bc84 BH |
348 | "linux,boot-cpu", NULL) != NULL) |
349 | found = boot_cpu_count; | |
9b6b563c | 350 | } |
4df20460 AB |
351 | #ifdef CONFIG_SMP |
352 | /* logical cpu id is always 0 on UP kernels */ | |
9d07bc84 | 353 | boot_cpu_count++; |
4df20460 AB |
354 | #endif |
355 | } | |
356 | ||
7222f779 BH |
357 | /* Not the boot CPU */ |
358 | if (found < 0) | |
359 | return 0; | |
9b6b563c | 360 | |
7222f779 BH |
361 | DBG("boot cpu: logical %d physical %d\n", found, |
362 | be32_to_cpu(intserv[found_thread])); | |
363 | boot_cpuid = found; | |
364 | set_hard_smp_processor_id(found, be32_to_cpu(intserv[found_thread])); | |
14b3d926 | 365 | |
7222f779 BH |
366 | /* |
367 | * PAPR defines "logical" PVR values for cpus that | |
368 | * meet various levels of the architecture: | |
369 | * 0x0f000001 Architecture version 2.04 | |
370 | * 0x0f000002 Architecture version 2.05 | |
371 | * If the cpu-version property in the cpu node contains | |
372 | * such a value, we call identify_cpu again with the | |
373 | * logical PVR value in order to use the cpu feature | |
374 | * bits appropriate for the architecture level. | |
375 | * | |
376 | * A POWER6 partition in "POWER6 architected" mode | |
377 | * uses the 0x0f000002 PVR value; in POWER5+ mode | |
378 | * it uses 0x0f000001. | |
379 | */ | |
380 | prop = of_get_flat_dt_prop(node, "cpu-version", NULL); | |
381 | if (prop && (be32_to_cpup(prop) & 0xff000000) == 0x0f000000) | |
382 | identify_cpu(0, be32_to_cpup(prop)); | |
383 | ||
384 | identical_pvr_fixup(node); | |
9b6b563c | 385 | |
974a76f5 | 386 | check_cpu_feature_properties(node); |
d205819e | 387 | check_cpu_pa_features(node); |
9c61f7a0 | 388 | init_mmu_slb_size(node); |
d205819e | 389 | |
4a85b31d | 390 | #ifdef CONFIG_PPC64 |
4df20460 | 391 | if (nthreads > 1) |
9b6b563c | 392 | cur_cpu_spec->cpu_features |= CPU_FTR_SMT; |
4df20460 AB |
393 | else |
394 | cur_cpu_spec->cpu_features &= ~CPU_FTR_SMT; | |
9b6b563c | 395 | #endif |
9b6b563c PM |
396 | return 0; |
397 | } | |
398 | ||
e51df2c1 AB |
399 | static int __init early_init_dt_scan_chosen_ppc(unsigned long node, |
400 | const char *uname, | |
401 | int depth, void *data) | |
9b6b563c | 402 | { |
9d0c4dfe | 403 | const unsigned long *lprop; /* All these set by kernel, so no need to convert endian */ |
9b6b563c | 404 | |
32c97689 GL |
405 | /* Use common scan routine to determine if this is the chosen node */ |
406 | if (early_init_dt_scan_chosen(node, uname, depth, data) == 0) | |
407 | return 0; | |
408 | ||
9b6b563c PM |
409 | #ifdef CONFIG_PPC64 |
410 | /* check if iommu is forced on or off */ | |
3c726f8d | 411 | if (of_get_flat_dt_prop(node, "linux,iommu-off", NULL) != NULL) |
9b6b563c | 412 | iommu_is_off = 1; |
3c726f8d | 413 | if (of_get_flat_dt_prop(node, "linux,iommu-force-on", NULL) != NULL) |
9b6b563c PM |
414 | iommu_force_on = 1; |
415 | #endif | |
416 | ||
2babf5c2 | 417 | /* mem=x on the command line is the preferred mechanism */ |
86e03221 GL |
418 | lprop = of_get_flat_dt_prop(node, "linux,memory-limit", NULL); |
419 | if (lprop) | |
420 | memory_limit = *lprop; | |
9b6b563c PM |
421 | |
422 | #ifdef CONFIG_PPC64 | |
86e03221 GL |
423 | lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-start", NULL); |
424 | if (lprop) | |
425 | tce_alloc_start = *lprop; | |
426 | lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-end", NULL); | |
427 | if (lprop) | |
428 | tce_alloc_end = *lprop; | |
9b6b563c PM |
429 | #endif |
430 | ||
da665885 | 431 | #ifdef CONFIG_KEXEC_CORE |
63277161 | 432 | lprop = of_get_flat_dt_prop(node, "linux,crashkernel-base", NULL); |
70c6cc37 LV |
433 | if (lprop) |
434 | crashk_res.start = *lprop; | |
dcee3036 | 435 | |
63277161 | 436 | lprop = of_get_flat_dt_prop(node, "linux,crashkernel-size", NULL); |
70c6cc37 LV |
437 | if (lprop) |
438 | crashk_res.end = crashk_res.start + *lprop - 1; | |
dcee3036 | 439 | #endif |
32c97689 GL |
440 | |
441 | /* break now */ | |
442 | return 1; | |
9b6b563c PM |
443 | } |
444 | ||
0204568a PM |
445 | #ifdef CONFIG_PPC_PSERIES |
446 | /* | |
447 | * Interpret the ibm,dynamic-memory property in the | |
448 | * /ibm,dynamic-reconfiguration-memory node. | |
449 | * This contains a list of memory blocks along with NUMA affinity | |
450 | * information. | |
451 | */ | |
452 | static int __init early_init_dt_scan_drconf_memory(unsigned long node) | |
453 | { | |
9d0c4dfe RH |
454 | const __be32 *dm, *ls, *usm; |
455 | int l; | |
456 | unsigned long n, flags; | |
95f72d1e | 457 | u64 base, size, memblock_size; |
cf00085d | 458 | unsigned int is_kexec_kdump = 0, rngs; |
0204568a | 459 | |
3fdfd990 | 460 | ls = of_get_flat_dt_prop(node, "ibm,lmb-size", &l); |
0f0b56c3 | 461 | if (ls == NULL || l < dt_root_size_cells * sizeof(__be32)) |
0204568a | 462 | return 0; |
95f72d1e | 463 | memblock_size = dt_mem_next_cell(dt_root_size_cells, &ls); |
0204568a | 464 | |
63277161 | 465 | dm = of_get_flat_dt_prop(node, "ibm,dynamic-memory", &l); |
0f0b56c3 | 466 | if (dm == NULL || l < sizeof(__be32)) |
0204568a PM |
467 | return 0; |
468 | ||
e91ae5bd | 469 | n = of_read_number(dm++, 1); /* number of entries */ |
0f0b56c3 | 470 | if (l < (n * (dt_root_addr_cells + 4) + 1) * sizeof(__be32)) |
0204568a PM |
471 | return 0; |
472 | ||
cf00085d | 473 | /* check if this is a kexec/kdump kernel. */ |
63277161 | 474 | usm = of_get_flat_dt_prop(node, "linux,drconf-usable-memory", |
cf00085d C |
475 | &l); |
476 | if (usm != NULL) | |
477 | is_kexec_kdump = 1; | |
478 | ||
0204568a PM |
479 | for (; n != 0; --n) { |
480 | base = dt_mem_next_cell(dt_root_addr_cells, &dm); | |
e91ae5bd | 481 | flags = of_read_number(&dm[3], 1); |
0204568a PM |
482 | /* skip DRC index, pad, assoc. list index, flags */ |
483 | dm += 4; | |
9afac933 AK |
484 | /* skip this block if the reserved bit is set in flags |
485 | or if the block is not assigned to this partition */ | |
486 | if ((flags & DRCONF_MEM_RESERVED) || | |
487 | !(flags & DRCONF_MEM_ASSIGNED)) | |
0204568a | 488 | continue; |
95f72d1e | 489 | size = memblock_size; |
cf00085d C |
490 | rngs = 1; |
491 | if (is_kexec_kdump) { | |
492 | /* | |
95f72d1e | 493 | * For each memblock in ibm,dynamic-memory, a corresponding |
cf00085d C |
494 | * entry in linux,drconf-usable-memory property contains |
495 | * a counter 'p' followed by 'p' (base, size) duple. | |
496 | * Now read the counter from | |
497 | * linux,drconf-usable-memory property | |
498 | */ | |
499 | rngs = dt_mem_next_cell(dt_root_size_cells, &usm); | |
500 | if (!rngs) /* there are no (base, size) duple */ | |
0204568a | 501 | continue; |
0204568a | 502 | } |
cf00085d C |
503 | do { |
504 | if (is_kexec_kdump) { | |
505 | base = dt_mem_next_cell(dt_root_addr_cells, | |
506 | &usm); | |
507 | size = dt_mem_next_cell(dt_root_size_cells, | |
508 | &usm); | |
509 | } | |
510 | if (iommu_is_off) { | |
511 | if (base >= 0x80000000ul) | |
512 | continue; | |
513 | if ((base + size) > 0x80000000ul) | |
514 | size = 0x80000000ul - base; | |
515 | } | |
95f72d1e | 516 | memblock_add(base, size); |
cf00085d | 517 | } while (--rngs); |
0204568a | 518 | } |
95f72d1e | 519 | memblock_dump_all(); |
0204568a PM |
520 | return 0; |
521 | } | |
522 | #else | |
523 | #define early_init_dt_scan_drconf_memory(node) 0 | |
524 | #endif /* CONFIG_PPC_PSERIES */ | |
9b6b563c | 525 | |
51975db0 GL |
526 | static int __init early_init_dt_scan_memory_ppc(unsigned long node, |
527 | const char *uname, | |
528 | int depth, void *data) | |
9b6b563c | 529 | { |
0204568a PM |
530 | if (depth == 1 && |
531 | strcmp(uname, "ibm,dynamic-reconfiguration-memory") == 0) | |
532 | return early_init_dt_scan_drconf_memory(node); | |
51975db0 GL |
533 | |
534 | return early_init_dt_scan_memory(node, uname, depth, data); | |
535 | } | |
0204568a | 536 | |
b27652dd KH |
537 | /* |
538 | * For a relocatable kernel, we need to get the memstart_addr first, | |
539 | * then use it to calculate the virtual kernel start address. This has | |
540 | * to happen at a very early stage (before machine_init). In this case, | |
541 | * we just want to get the memstart_address and would not like to mess the | |
542 | * memblock at this stage. So introduce a variable to skip the memblock_add() | |
543 | * for this reason. | |
544 | */ | |
545 | #ifdef CONFIG_RELOCATABLE | |
546 | static int add_mem_to_memblock = 1; | |
547 | #else | |
548 | #define add_mem_to_memblock 1 | |
549 | #endif | |
550 | ||
51975db0 GL |
551 | void __init early_init_dt_add_memory_arch(u64 base, u64 size) |
552 | { | |
cd3db0c4 | 553 | #ifdef CONFIG_PPC64 |
51975db0 GL |
554 | if (iommu_is_off) { |
555 | if (base >= 0x80000000ul) | |
556 | return; | |
557 | if ((base + size) > 0x80000000ul) | |
558 | size = 0x80000000ul - base; | |
559 | } | |
9b6b563c | 560 | #endif |
03bf469a BH |
561 | /* Keep track of the beginning of memory -and- the size of |
562 | * the very first block in the device-tree as it represents | |
563 | * the RMA on ppc64 server | |
564 | */ | |
565 | if (base < memstart_addr) { | |
566 | memstart_addr = base; | |
567 | first_memblock_size = size; | |
568 | } | |
cd3db0c4 BH |
569 | |
570 | /* Add the chunk to the MEMBLOCK list */ | |
b27652dd KH |
571 | if (add_mem_to_memblock) |
572 | memblock_add(base, size); | |
9b6b563c PM |
573 | } |
574 | ||
c039e3a8 | 575 | static void __init early_reserve_mem_dt(void) |
0962e800 | 576 | { |
9d0c4dfe RH |
577 | unsigned long i, dt_root; |
578 | int len; | |
0962e800 JK |
579 | const __be32 *prop; |
580 | ||
24bbd929 | 581 | early_init_fdt_reserve_self(); |
edba274c RH |
582 | early_init_fdt_scan_reserved_mem(); |
583 | ||
0962e800 JK |
584 | dt_root = of_get_flat_dt_root(); |
585 | ||
586 | prop = of_get_flat_dt_prop(dt_root, "reserved-ranges", &len); | |
587 | ||
588 | if (!prop) | |
c039e3a8 BH |
589 | return; |
590 | ||
591 | DBG("Found new-style reserved-ranges\n"); | |
0962e800 JK |
592 | |
593 | /* Each reserved range is an (address,size) pair, 2 cells each, | |
594 | * totalling 4 cells per range. */ | |
595 | for (i = 0; i < len / (sizeof(*prop) * 4); i++) { | |
596 | u64 base, size; | |
597 | ||
598 | base = of_read_number(prop + (i * 4) + 0, 2); | |
599 | size = of_read_number(prop + (i * 4) + 2, 2); | |
600 | ||
c039e3a8 BH |
601 | if (size) { |
602 | DBG("reserving: %llx -> %llx\n", base, size); | |
0962e800 | 603 | memblock_reserve(base, size); |
c039e3a8 | 604 | } |
0962e800 | 605 | } |
0962e800 JK |
606 | } |
607 | ||
9b6b563c PM |
608 | static void __init early_reserve_mem(void) |
609 | { | |
dc0e643a | 610 | __be64 *reserve_map; |
9b6b563c | 611 | |
dc0e643a | 612 | reserve_map = (__be64 *)(((unsigned long)initial_boot_params) + |
060f78c2 | 613 | fdt_off_mem_rsvmap(initial_boot_params)); |
4d1f3f25 | 614 | |
c039e3a8 BH |
615 | /* Look for the new "reserved-regions" property in the DT */ |
616 | early_reserve_mem_dt(); | |
0962e800 | 617 | |
30437b3e | 618 | #ifdef CONFIG_BLK_DEV_INITRD |
c039e3a8 BH |
619 | /* Then reserve the initrd, if any */ |
620 | if (initrd_start && (initrd_end > initrd_start)) { | |
307cfe71 BH |
621 | memblock_reserve(_ALIGN_DOWN(__pa(initrd_start), PAGE_SIZE), |
622 | _ALIGN_UP(initrd_end, PAGE_SIZE) - | |
623 | _ALIGN_DOWN(initrd_start, PAGE_SIZE)); | |
c039e3a8 | 624 | } |
30437b3e DG |
625 | #endif /* CONFIG_BLK_DEV_INITRD */ |
626 | ||
cbbcf340 KG |
627 | #ifdef CONFIG_PPC32 |
628 | /* | |
629 | * Handle the case where we might be booting from an old kexec | |
630 | * image that setup the mem_rsvmap as pairs of 32-bit values | |
631 | */ | |
dc0e643a | 632 | if (be64_to_cpup(reserve_map) > 0xffffffffull) { |
cbbcf340 | 633 | u32 base_32, size_32; |
dc0e643a | 634 | __be32 *reserve_map_32 = (__be32 *)reserve_map; |
cbbcf340 | 635 | |
c039e3a8 BH |
636 | DBG("Found old 32-bit reserve map\n"); |
637 | ||
cbbcf340 | 638 | while (1) { |
dc0e643a IM |
639 | base_32 = be32_to_cpup(reserve_map_32++); |
640 | size_32 = be32_to_cpup(reserve_map_32++); | |
cbbcf340 KG |
641 | if (size_32 == 0) |
642 | break; | |
329dda08 | 643 | DBG("reserving: %x -> %x\n", base_32, size_32); |
95f72d1e | 644 | memblock_reserve(base_32, size_32); |
cbbcf340 KG |
645 | } |
646 | return; | |
647 | } | |
648 | #endif | |
9b6b563c PM |
649 | } |
650 | ||
651 | void __init early_init_devtree(void *params) | |
652 | { | |
49a84965 | 653 | phys_addr_t limit; |
6ca4f749 | 654 | |
44348105 | 655 | DBG(" -> early_init_devtree(%p)\n", params); |
9b6b563c | 656 | |
ad72a279 ME |
657 | /* Too early to BUG_ON(), do it by hand */ |
658 | if (!early_init_dt_verify(params)) | |
659 | panic("BUG: Failed verifying flat device tree, bad version?"); | |
660 | ||
458148c0 ME |
661 | #ifdef CONFIG_PPC_RTAS |
662 | /* Some machines might need RTAS info for debugging, grab it now. */ | |
663 | of_scan_flat_dt(early_init_dt_scan_rtas, NULL); | |
664 | #endif | |
665 | ||
14a43e69 BH |
666 | #ifdef CONFIG_PPC_POWERNV |
667 | /* Some machines might need OPAL info for debugging, grab it now. */ | |
668 | of_scan_flat_dt(early_init_dt_scan_opal, NULL); | |
669 | #endif | |
670 | ||
eb39c880 MS |
671 | #ifdef CONFIG_FA_DUMP |
672 | /* scan tree to see if dump is active during last boot */ | |
673 | of_scan_flat_dt(early_init_dt_scan_fw_dump, NULL); | |
674 | #endif | |
675 | ||
9b6b563c PM |
676 | /* Retrieve various informations from the /chosen node of the |
677 | * device-tree, including the platform type, initrd location and | |
678 | * size, TCE reserve, and more ... | |
679 | */ | |
3e47d147 | 680 | of_scan_flat_dt(early_init_dt_scan_chosen_ppc, boot_command_line); |
9b6b563c | 681 | |
95f72d1e | 682 | /* Scan memory nodes and rebuild MEMBLOCKs */ |
3c726f8d | 683 | of_scan_flat_dt(early_init_dt_scan_root, NULL); |
51975db0 | 684 | of_scan_flat_dt(early_init_dt_scan_memory_ppc, NULL); |
846f77b0 | 685 | |
846f77b0 ME |
686 | parse_early_param(); |
687 | ||
ba14f649 KG |
688 | /* make sure we've parsed cmdline for mem= before this */ |
689 | if (memory_limit) | |
a84fcd46 | 690 | first_memblock_size = min_t(u64, first_memblock_size, memory_limit); |
ba14f649 | 691 | setup_initial_memory_limit(memstart_addr, first_memblock_size); |
95f72d1e YL |
692 | /* Reserve MEMBLOCK regions used by kernel, initrd, dt, etc... */ |
693 | memblock_reserve(PHYSICAL_START, __pa(klimit) - PHYSICAL_START); | |
549e8152 PM |
694 | /* If relocatable, reserve first 32k for interrupt vectors etc. */ |
695 | if (PHYSICAL_START > MEMORY_START) | |
95f72d1e | 696 | memblock_reserve(MEMORY_START, 0x8000); |
47310413 | 697 | reserve_kdump_trampoline(); |
eb39c880 MS |
698 | #ifdef CONFIG_FA_DUMP |
699 | /* | |
700 | * If we fail to reserve memory for firmware-assisted dump then | |
701 | * fallback to kexec based kdump. | |
702 | */ | |
703 | if (fadump_reserve_mem() == 0) | |
704 | #endif | |
705 | reserve_crashkernel(); | |
9b6b563c PM |
706 | early_reserve_mem(); |
707 | ||
14ed7409 | 708 | /* Ensure that total memory size is page-aligned. */ |
6fbef13c | 709 | limit = ALIGN(memory_limit ?: memblock_phys_mem_size(), PAGE_SIZE); |
95f72d1e | 710 | memblock_enforce_memory_limit(limit); |
6ca4f749 | 711 | |
1aadc056 | 712 | memblock_allow_resize(); |
95f72d1e | 713 | memblock_dump_all(); |
2babf5c2 | 714 | |
95f72d1e | 715 | DBG("Phys. mem: %llx\n", memblock_phys_mem_size()); |
2babf5c2 ME |
716 | |
717 | /* We may need to relocate the flat tree, do it now. | |
718 | * FIXME .. and the initrd too? */ | |
719 | move_device_tree(); | |
720 | ||
1426d5a3 ME |
721 | allocate_pacas(); |
722 | ||
9b6b563c PM |
723 | DBG("Scanning CPUs ...\n"); |
724 | ||
25985edc | 725 | /* Retrieve CPU related informations from the flat tree |
3c726f8d | 726 | * (altivec support, boot CPU ID, ...) |
9b6b563c | 727 | */ |
3c726f8d | 728 | of_scan_flat_dt(early_init_dt_scan_cpus, NULL); |
36ae37e3 | 729 | if (boot_cpuid < 0) { |
d939be3a | 730 | printk("Failed to identify boot CPU !\n"); |
36ae37e3 BH |
731 | BUG(); |
732 | } | |
9b6b563c | 733 | |
7ac87abb ME |
734 | #if defined(CONFIG_SMP) && defined(CONFIG_PPC64) |
735 | /* We'll later wait for secondaries to check in; there are | |
736 | * NCPUS-1 non-boot CPUs :-) | |
737 | */ | |
738 | spinning_secondaries = boot_cpu_count - 1; | |
739 | #endif | |
740 | ||
1a01dc87 ME |
741 | mmu_early_init_devtree(); |
742 | ||
55672ecf MS |
743 | #ifdef CONFIG_PPC_POWERNV |
744 | /* Scan and build the list of machine check recoverable ranges */ | |
745 | of_scan_flat_dt(early_init_dt_scan_recoverable_ranges, NULL); | |
746 | #endif | |
da6a97bf | 747 | epapr_paravirt_early_init(); |
55672ecf | 748 | |
3808a889 BH |
749 | /* Now try to figure out if we are running on LPAR and so on */ |
750 | pseries_probe_fw_features(); | |
751 | ||
166dd7d3 BH |
752 | #ifdef CONFIG_PPC_PS3 |
753 | /* Identify PS3 firmware */ | |
754 | if (of_flat_dt_is_compatible(of_get_flat_dt_root(), "sony,ps3")) | |
755 | powerpc_firmware_features |= FW_FEATURE_PS3_POSSIBLE; | |
756 | #endif | |
757 | ||
9b6b563c PM |
758 | DBG(" <- early_init_devtree()\n"); |
759 | } | |
760 | ||
b27652dd KH |
761 | #ifdef CONFIG_RELOCATABLE |
762 | /* | |
763 | * This function run before early_init_devtree, so we have to init | |
764 | * initial_boot_params. | |
765 | */ | |
766 | void __init early_get_first_memblock_info(void *params, phys_addr_t *size) | |
767 | { | |
768 | /* Setup flat device-tree pointer */ | |
769 | initial_boot_params = params; | |
770 | ||
771 | /* | |
772 | * Scan the memory nodes and set add_mem_to_memblock to 0 to avoid | |
773 | * mess the memblock. | |
774 | */ | |
775 | add_mem_to_memblock = 0; | |
776 | of_scan_flat_dt(early_init_dt_scan_root, NULL); | |
777 | of_scan_flat_dt(early_init_dt_scan_memory_ppc, NULL); | |
778 | add_mem_to_memblock = 1; | |
779 | ||
780 | if (size) | |
781 | *size = first_memblock_size; | |
782 | } | |
783 | #endif | |
784 | ||
9b6b563c PM |
785 | /******* |
786 | * | |
787 | * New implementation of the OF "find" APIs, return a refcounted | |
788 | * object, call of_node_put() when done. The device tree and list | |
789 | * are protected by a rw_lock. | |
790 | * | |
791 | * Note that property management will need some locking as well, | |
792 | * this isn't dealt with yet. | |
793 | * | |
794 | *******/ | |
795 | ||
b37193b7 BH |
796 | /** |
797 | * of_get_ibm_chip_id - Returns the IBM "chip-id" of a device | |
798 | * @np: device node of the device | |
799 | * | |
800 | * This looks for a property "ibm,chip-id" in the node or any | |
801 | * of its parents and returns its content, or -1 if it cannot | |
802 | * be found. | |
803 | */ | |
804 | int of_get_ibm_chip_id(struct device_node *np) | |
805 | { | |
806 | of_node_get(np); | |
1856f50c | 807 | while (np) { |
1856f50c | 808 | u32 chip_id; |
b37193b7 | 809 | |
1856f50c CJ |
810 | /* |
811 | * Skiboot may produce memory nodes that contain more than one | |
812 | * cell in chip-id, we only read the first one here. | |
813 | */ | |
814 | if (!of_property_read_u32(np, "ibm,chip-id", &chip_id)) { | |
b37193b7 | 815 | of_node_put(np); |
1856f50c | 816 | return chip_id; |
b37193b7 | 817 | } |
16c1d606 ME |
818 | |
819 | np = of_get_next_parent(np); | |
b37193b7 BH |
820 | } |
821 | return -1; | |
822 | } | |
b130e7c0 | 823 | EXPORT_SYMBOL(of_get_ibm_chip_id); |
b37193b7 | 824 | |
3eb906c6 ME |
825 | /** |
826 | * cpu_to_chip_id - Return the cpus chip-id | |
827 | * @cpu: The logical cpu number. | |
828 | * | |
829 | * Return the value of the ibm,chip-id property corresponding to the given | |
830 | * logical cpu number. If the chip-id can not be found, returns -1. | |
831 | */ | |
832 | int cpu_to_chip_id(int cpu) | |
833 | { | |
834 | struct device_node *np; | |
835 | ||
836 | np = of_get_cpu_node(cpu, NULL); | |
837 | if (!np) | |
838 | return -1; | |
839 | ||
840 | of_node_put(np); | |
841 | return of_get_ibm_chip_id(np); | |
842 | } | |
843 | EXPORT_SYMBOL(cpu_to_chip_id); | |
844 | ||
819d5965 SH |
845 | bool arch_match_cpu_phys_id(int cpu, u64 phys_id) |
846 | { | |
847 | return (int)phys_id == get_hard_smp_processor_id(cpu); | |
848 | } |