Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 1 | /* |
| 2 | * |
| 3 | * Common boot and setup code. |
| 4 | * |
| 5 | * Copyright (C) 2001 PPC64 Team, IBM Corp |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU General Public License |
| 9 | * as published by the Free Software Foundation; either version |
| 10 | * 2 of the License, or (at your option) any later version. |
| 11 | */ |
| 12 | |
Benjamin Herrenschmidt | 7191b61 | 2013-07-25 12:12:32 +1000 | [diff] [blame] | 13 | #define DEBUG |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 14 | |
Paul Gortmaker | 4b16f8e | 2011-07-22 18:24:23 -0400 | [diff] [blame] | 15 | #include <linux/export.h> |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 16 | #include <linux/string.h> |
| 17 | #include <linux/sched.h> |
| 18 | #include <linux/init.h> |
| 19 | #include <linux/kernel.h> |
| 20 | #include <linux/reboot.h> |
| 21 | #include <linux/delay.h> |
| 22 | #include <linux/initrd.h> |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 23 | #include <linux/seq_file.h> |
| 24 | #include <linux/ioport.h> |
| 25 | #include <linux/console.h> |
| 26 | #include <linux/utsname.h> |
| 27 | #include <linux/tty.h> |
| 28 | #include <linux/root_dev.h> |
| 29 | #include <linux/notifier.h> |
| 30 | #include <linux/cpu.h> |
| 31 | #include <linux/unistd.h> |
| 32 | #include <linux/serial.h> |
| 33 | #include <linux/serial_8250.h> |
Anton Blanchard | 7a0268f | 2006-01-11 13:16:44 +1100 | [diff] [blame] | 34 | #include <linux/bootmem.h> |
Benjamin Herrenschmidt | 12d04ee | 2006-11-11 17:25:02 +1100 | [diff] [blame] | 35 | #include <linux/pci.h> |
Benjamin Herrenschmidt | 945feb1 | 2008-04-17 14:35:01 +1000 | [diff] [blame] | 36 | #include <linux/lockdep.h> |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 37 | #include <linux/memblock.h> |
Anton Blanchard | a5d8625 | 2014-06-04 17:50:47 +1000 | [diff] [blame] | 38 | #include <linux/memory.h> |
Anton Blanchard | c54b2bf | 2015-04-09 12:52:56 +1000 | [diff] [blame] | 39 | #include <linux/nmi.h> |
Becky Bruce | a614688 | 2011-10-10 10:50:43 +0000 | [diff] [blame] | 40 | |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 41 | #include <asm/io.h> |
Michael Ellerman | 0cc4746 | 2005-12-04 18:39:37 +1100 | [diff] [blame] | 42 | #include <asm/kdump.h> |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 43 | #include <asm/prom.h> |
| 44 | #include <asm/processor.h> |
| 45 | #include <asm/pgtable.h> |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 46 | #include <asm/smp.h> |
| 47 | #include <asm/elf.h> |
| 48 | #include <asm/machdep.h> |
| 49 | #include <asm/paca.h> |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 50 | #include <asm/time.h> |
| 51 | #include <asm/cputable.h> |
| 52 | #include <asm/sections.h> |
| 53 | #include <asm/btext.h> |
| 54 | #include <asm/nvram.h> |
| 55 | #include <asm/setup.h> |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 56 | #include <asm/rtas.h> |
| 57 | #include <asm/iommu.h> |
| 58 | #include <asm/serial.h> |
| 59 | #include <asm/cache.h> |
| 60 | #include <asm/page.h> |
| 61 | #include <asm/mmu.h> |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 62 | #include <asm/firmware.h> |
Paul Mackerras | f78541d | 2005-10-28 22:53:37 +1000 | [diff] [blame] | 63 | #include <asm/xmon.h> |
David Gibson | dcad47f | 2005-11-07 09:49:43 +1100 | [diff] [blame] | 64 | #include <asm/udbg.h> |
Michael Ellerman | 593e537 | 2005-11-12 00:06:06 +1100 | [diff] [blame] | 65 | #include <asm/kexec.h> |
Kumar Gala | d36b4c4 | 2011-04-06 00:18:48 -0500 | [diff] [blame] | 66 | #include <asm/code-patching.h> |
Michael Ellerman | 5d31a96 | 2016-03-24 22:04:04 +1100 | [diff] [blame] | 67 | #include <asm/livepatch.h> |
Benjamin Herrenschmidt | d3cbff1 | 2016-07-05 15:03:49 +1000 | [diff] [blame] | 68 | #include <asm/opal.h> |
Benjamin Herrenschmidt | b1923ca | 2016-07-05 15:07:51 +1000 | [diff] [blame] | 69 | #include <asm/cputhreads.h> |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 70 | |
| 71 | #ifdef DEBUG |
| 72 | #define DBG(fmt...) udbg_printf(fmt) |
| 73 | #else |
| 74 | #define DBG(fmt...) |
| 75 | #endif |
| 76 | |
Chen Gang | 8246aca | 2013-03-20 14:30:12 +0800 | [diff] [blame] | 77 | int spinning_secondaries; |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 78 | u64 ppc64_pft_size; |
| 79 | |
Olof Johansson | dabcafd | 2005-12-08 19:40:17 -0600 | [diff] [blame] | 80 | /* Pick defaults since we might want to patch instructions |
| 81 | * before we've read this from the device tree. |
| 82 | */ |
| 83 | struct ppc64_caches ppc64_caches = { |
Olof Johansson | 5a2fe38 | 2006-09-06 14:34:41 -0500 | [diff] [blame] | 84 | .dline_size = 0x40, |
| 85 | .log_dline_size = 6, |
| 86 | .iline_size = 0x40, |
| 87 | .log_iline_size = 6 |
Olof Johansson | dabcafd | 2005-12-08 19:40:17 -0600 | [diff] [blame] | 88 | }; |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 89 | EXPORT_SYMBOL_GPL(ppc64_caches); |
| 90 | |
| 91 | /* |
| 92 | * These are used in binfmt_elf.c to put aux entries on the stack |
| 93 | * for each elf executable being started. |
| 94 | */ |
| 95 | int dcache_bsize; |
| 96 | int icache_bsize; |
| 97 | int ucache_bsize; |
| 98 | |
Scott Wood | 28efc35 | 2013-10-11 19:22:38 -0500 | [diff] [blame] | 99 | #if defined(CONFIG_PPC_BOOK3E) && defined(CONFIG_SMP) |
Benjamin Herrenschmidt | b1923ca | 2016-07-05 15:07:51 +1000 | [diff] [blame] | 100 | void __init setup_tlb_core_data(void) |
Scott Wood | 28efc35 | 2013-10-11 19:22:38 -0500 | [diff] [blame] | 101 | { |
| 102 | int cpu; |
| 103 | |
Scott Wood | 82d86de | 2014-03-07 14:48:35 -0600 | [diff] [blame] | 104 | BUILD_BUG_ON(offsetof(struct tlb_core_data, lock) != 0); |
| 105 | |
Scott Wood | 28efc35 | 2013-10-11 19:22:38 -0500 | [diff] [blame] | 106 | for_each_possible_cpu(cpu) { |
| 107 | int first = cpu_first_thread_sibling(cpu); |
| 108 | |
Scott Wood | d9e1831 | 2015-10-06 22:48:09 -0500 | [diff] [blame] | 109 | /* |
| 110 | * If we boot via kdump on a non-primary thread, |
| 111 | * make sure we point at the thread that actually |
| 112 | * set up this TLB. |
| 113 | */ |
| 114 | if (cpu_first_thread_sibling(boot_cpuid) == first) |
| 115 | first = boot_cpuid; |
| 116 | |
Scott Wood | 28efc35 | 2013-10-11 19:22:38 -0500 | [diff] [blame] | 117 | paca[cpu].tcd_ptr = &paca[first].tcd; |
| 118 | |
| 119 | /* |
| 120 | * If we have threads, we need either tlbsrx. |
| 121 | * or e6500 tablewalk mode, or else TLB handlers |
| 122 | * will be racy and could produce duplicate entries. |
| 123 | */ |
| 124 | if (smt_enabled_at_boot >= 2 && |
| 125 | !mmu_has_feature(MMU_FTR_USE_TLBRSRV) && |
| 126 | book3e_htw_mode != PPC_HTW_E6500) { |
| 127 | /* Should we panic instead? */ |
| 128 | WARN_ONCE("%s: unsupported MMU configuration -- expect problems\n", |
| 129 | __func__); |
| 130 | } |
| 131 | } |
| 132 | } |
Scott Wood | 28efc35 | 2013-10-11 19:22:38 -0500 | [diff] [blame] | 133 | #endif |
| 134 | |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 135 | #ifdef CONFIG_SMP |
| 136 | |
Nathan Fontenot | 954e6da | 2010-08-05 07:42:11 +0000 | [diff] [blame] | 137 | static char *smt_enabled_cmdline; |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 138 | |
| 139 | /* Look for ibm,smt-enabled OF option */ |
Benjamin Herrenschmidt | b1923ca | 2016-07-05 15:07:51 +1000 | [diff] [blame] | 140 | void __init check_smt_enabled(void) |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 141 | { |
| 142 | struct device_node *dn; |
Jeremy Kerr | a7f67bd | 2006-07-12 15:35:54 +1000 | [diff] [blame] | 143 | const char *smt_option; |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 144 | |
Nathan Fontenot | 954e6da | 2010-08-05 07:42:11 +0000 | [diff] [blame] | 145 | /* Default to enabling all threads */ |
| 146 | smt_enabled_at_boot = threads_per_core; |
| 147 | |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 148 | /* Allow the command line to overrule the OF option */ |
Nathan Fontenot | 954e6da | 2010-08-05 07:42:11 +0000 | [diff] [blame] | 149 | if (smt_enabled_cmdline) { |
| 150 | if (!strcmp(smt_enabled_cmdline, "on")) |
| 151 | smt_enabled_at_boot = threads_per_core; |
| 152 | else if (!strcmp(smt_enabled_cmdline, "off")) |
| 153 | smt_enabled_at_boot = 0; |
| 154 | else { |
Daniel Walter | 1618bd5 | 2014-08-08 14:24:01 -0700 | [diff] [blame] | 155 | int smt; |
Nathan Fontenot | 954e6da | 2010-08-05 07:42:11 +0000 | [diff] [blame] | 156 | int rc; |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 157 | |
Daniel Walter | 1618bd5 | 2014-08-08 14:24:01 -0700 | [diff] [blame] | 158 | rc = kstrtoint(smt_enabled_cmdline, 10, &smt); |
Nathan Fontenot | 954e6da | 2010-08-05 07:42:11 +0000 | [diff] [blame] | 159 | if (!rc) |
| 160 | smt_enabled_at_boot = |
Daniel Walter | 1618bd5 | 2014-08-08 14:24:01 -0700 | [diff] [blame] | 161 | min(threads_per_core, smt); |
Nathan Fontenot | 954e6da | 2010-08-05 07:42:11 +0000 | [diff] [blame] | 162 | } |
| 163 | } else { |
| 164 | dn = of_find_node_by_path("/options"); |
| 165 | if (dn) { |
| 166 | smt_option = of_get_property(dn, "ibm,smt-enabled", |
| 167 | NULL); |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 168 | |
Nathan Fontenot | 954e6da | 2010-08-05 07:42:11 +0000 | [diff] [blame] | 169 | if (smt_option) { |
| 170 | if (!strcmp(smt_option, "on")) |
| 171 | smt_enabled_at_boot = threads_per_core; |
| 172 | else if (!strcmp(smt_option, "off")) |
| 173 | smt_enabled_at_boot = 0; |
| 174 | } |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 175 | |
Nathan Fontenot | 954e6da | 2010-08-05 07:42:11 +0000 | [diff] [blame] | 176 | of_node_put(dn); |
| 177 | } |
| 178 | } |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 179 | } |
| 180 | |
| 181 | /* Look for smt-enabled= cmdline option */ |
| 182 | static int __init early_smt_enabled(char *p) |
| 183 | { |
Nathan Fontenot | 954e6da | 2010-08-05 07:42:11 +0000 | [diff] [blame] | 184 | smt_enabled_cmdline = p; |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 185 | return 0; |
| 186 | } |
| 187 | early_param("smt-enabled", early_smt_enabled); |
| 188 | |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 189 | #endif /* CONFIG_SMP */ |
| 190 | |
Michael Ellerman | 25e1381 | 2013-02-12 14:44:50 +0000 | [diff] [blame] | 191 | /** Fix up paca fields required for the boot cpu */ |
Benjamin Herrenschmidt | 009776b | 2016-07-05 15:07:50 +1000 | [diff] [blame] | 192 | static void __init fixup_boot_paca(void) |
Michael Ellerman | 25e1381 | 2013-02-12 14:44:50 +0000 | [diff] [blame] | 193 | { |
| 194 | /* The boot cpu is started */ |
| 195 | get_paca()->cpu_start = 1; |
| 196 | /* Allow percpu accesses to work until we setup percpu data */ |
| 197 | get_paca()->data_offset = 0; |
| 198 | } |
| 199 | |
Benjamin Herrenschmidt | 009776b | 2016-07-05 15:07:50 +1000 | [diff] [blame] | 200 | static void __init configure_exceptions(void) |
Benjamin Herrenschmidt | d3cbff1 | 2016-07-05 15:03:49 +1000 | [diff] [blame] | 201 | { |
| 202 | /* |
| 203 | * Setup the trampolines from the lowmem exception vectors |
| 204 | * to the kdump kernel when not using a relocatable kernel. |
| 205 | */ |
| 206 | setup_kdump_trampoline(); |
| 207 | |
| 208 | /* Under a PAPR hypervisor, we need hypercalls */ |
| 209 | if (firmware_has_feature(FW_FEATURE_SET_MODE)) { |
| 210 | /* Enable AIL if possible */ |
| 211 | pseries_enable_reloc_on_exc(); |
| 212 | |
| 213 | /* |
| 214 | * Tell the hypervisor that we want our exceptions to |
| 215 | * be taken in little endian mode. |
| 216 | * |
| 217 | * We don't call this for big endian as our calling convention |
| 218 | * makes us always enter in BE, and the call may fail under |
| 219 | * some circumstances with kdump. |
| 220 | */ |
| 221 | #ifdef __LITTLE_ENDIAN__ |
| 222 | pseries_little_endian_exceptions(); |
| 223 | #endif |
| 224 | } else { |
| 225 | /* Set endian mode using OPAL */ |
| 226 | if (firmware_has_feature(FW_FEATURE_OPAL)) |
| 227 | opal_configure_cores(); |
| 228 | |
| 229 | /* Enable AIL if supported, and we are in hypervisor mode */ |
Aneesh Kumar K.V | b8f1b4f | 2016-07-23 14:42:35 +0530 | [diff] [blame] | 230 | if (early_cpu_has_feature(CPU_FTR_HVMODE) && |
| 231 | early_cpu_has_feature(CPU_FTR_ARCH_207S)) { |
Benjamin Herrenschmidt | d3cbff1 | 2016-07-05 15:03:49 +1000 | [diff] [blame] | 232 | unsigned long lpcr = mfspr(SPRN_LPCR); |
| 233 | mtspr(SPRN_LPCR, lpcr | LPCR_AIL_3); |
| 234 | } |
| 235 | } |
| 236 | } |
| 237 | |
Benjamin Herrenschmidt | 8f619b54 | 2014-03-28 13:36:30 +1100 | [diff] [blame] | 238 | static void cpu_ready_for_interrupts(void) |
| 239 | { |
| 240 | /* Set IR and DR in PACA MSR */ |
| 241 | get_paca()->kernel_msr = MSR_KERNEL; |
Benjamin Herrenschmidt | 8f619b54 | 2014-03-28 13:36:30 +1100 | [diff] [blame] | 242 | } |
| 243 | |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 244 | /* |
| 245 | * Early initialization entry point. This is called by head.S |
| 246 | * with MMU translation disabled. We rely on the "feature" of |
| 247 | * the CPU that ignores the top 2 bits of the address in real |
| 248 | * mode so we can access kernel globals normally provided we |
| 249 | * only toy with things in the RMO region. From here, we do |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 250 | * some early parsing of the device-tree to setup out MEMBLOCK |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 251 | * data structures, and allocate & initialize the hash table |
| 252 | * and segment tables so we can start running with translation |
| 253 | * enabled. |
| 254 | * |
| 255 | * It is this function which will call the probe() callback of |
| 256 | * the various platform types and copy the matching one to the |
| 257 | * global ppc_md structure. Your platform can eventually do |
| 258 | * some very early initializations from the probe() routine, but |
| 259 | * this is not recommended, be very careful as, for example, the |
| 260 | * device-tree is not accessible via normal means at this point. |
| 261 | */ |
| 262 | |
| 263 | void __init early_setup(unsigned long dt_ptr) |
| 264 | { |
Geoff Levand | 6a7e406 | 2013-02-13 17:03:16 +0000 | [diff] [blame] | 265 | static __initdata struct paca_struct boot_paca; |
| 266 | |
Benjamin Herrenschmidt | 24d9649 | 2008-05-07 10:00:56 +1000 | [diff] [blame] | 267 | /* -------- printk is _NOT_ safe to use here ! ------- */ |
| 268 | |
Benjamin Herrenschmidt | 42c4aaa | 2006-10-24 16:42:40 +1000 | [diff] [blame] | 269 | /* Identify CPU type */ |
Paul Mackerras | 974a76f | 2006-11-10 20:38:53 +1100 | [diff] [blame] | 270 | identify_cpu(0, mfspr(SPRN_PVR)); |
Benjamin Herrenschmidt | 42c4aaa | 2006-10-24 16:42:40 +1000 | [diff] [blame] | 271 | |
Michael Ellerman | 33dbcf7 | 2006-06-28 13:18:53 +1000 | [diff] [blame] | 272 | /* Assume we're on cpu 0 for now. Don't write to the paca yet! */ |
Michael Ellerman | 1426d5a | 2010-01-28 13:23:22 +0000 | [diff] [blame] | 273 | initialise_paca(&boot_paca, 0); |
| 274 | setup_paca(&boot_paca); |
Michael Ellerman | 25e1381 | 2013-02-12 14:44:50 +0000 | [diff] [blame] | 275 | fixup_boot_paca(); |
Michael Ellerman | 33dbcf7 | 2006-06-28 13:18:53 +1000 | [diff] [blame] | 276 | |
Benjamin Herrenschmidt | 24d9649 | 2008-05-07 10:00:56 +1000 | [diff] [blame] | 277 | /* -------- printk is now safe to use ------- */ |
| 278 | |
Benjamin Herrenschmidt | f2fd251 | 2008-05-07 10:25:34 +1000 | [diff] [blame] | 279 | /* Enable early debugging if any specified (see udbg.h) */ |
| 280 | udbg_early_init(); |
| 281 | |
Benjamin Herrenschmidt | e822250 | 2006-03-28 23:15:54 +1100 | [diff] [blame] | 282 | DBG(" -> early_setup(), dt_ptr: 0x%lx\n", dt_ptr); |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 283 | |
| 284 | /* |
Linas Vepstas | 3c607ce | 2007-09-07 03:47:29 +1000 | [diff] [blame] | 285 | * Do early initialization using the flattened device |
| 286 | * tree, such as retrieving the physical memory map or |
| 287 | * calculating/retrieving the hash table size. |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 288 | */ |
| 289 | early_init_devtree(__va(dt_ptr)); |
| 290 | |
Anton Blanchard | 4df2046 | 2006-03-25 17:25:17 +1100 | [diff] [blame] | 291 | /* Now we know the logical id of our boot cpu, setup the paca. */ |
Michael Ellerman | 1426d5a | 2010-01-28 13:23:22 +0000 | [diff] [blame] | 292 | setup_paca(&paca[boot_cpuid]); |
Michael Ellerman | 25e1381 | 2013-02-12 14:44:50 +0000 | [diff] [blame] | 293 | fixup_boot_paca(); |
Anton Blanchard | 4df2046 | 2006-03-25 17:25:17 +1100 | [diff] [blame] | 294 | |
Benjamin Herrenschmidt | 63c254a | 2016-07-05 15:03:46 +1000 | [diff] [blame] | 295 | /* |
Benjamin Herrenschmidt | d3cbff1 | 2016-07-05 15:03:49 +1000 | [diff] [blame] | 296 | * Configure exception handlers. This include setting up trampolines |
| 297 | * if needed, setting exception endian mode, etc... |
Benjamin Herrenschmidt | 63c254a | 2016-07-05 15:03:46 +1000 | [diff] [blame] | 298 | */ |
Benjamin Herrenschmidt | d3cbff1 | 2016-07-05 15:03:49 +1000 | [diff] [blame] | 299 | configure_exceptions(); |
Michael Ellerman | 0cc4746 | 2005-12-04 18:39:37 +1100 | [diff] [blame] | 300 | |
Benjamin Herrenschmidt | c4bd6cb | 2016-07-05 15:03:42 +1000 | [diff] [blame] | 301 | /* Apply all the dynamic patching */ |
| 302 | apply_feature_fixups(); |
| 303 | |
Michael Ellerman | 9e8066f | 2016-07-26 21:55:48 +1000 | [diff] [blame] | 304 | /* Initialize the hash table or TLB handling */ |
| 305 | early_init_mmu(); |
| 306 | |
Benjamin Herrenschmidt | a944a9c | 2014-03-28 13:36:29 +1100 | [diff] [blame] | 307 | /* |
| 308 | * At this point, we can let interrupts switch to virtual mode |
| 309 | * (the MMU has been setup), so adjust the MSR in the PACA to |
Benjamin Herrenschmidt | 8f619b54 | 2014-03-28 13:36:30 +1100 | [diff] [blame] | 310 | * have IR and DR set and enable AIL if it exists |
Benjamin Herrenschmidt | a944a9c | 2014-03-28 13:36:29 +1100 | [diff] [blame] | 311 | */ |
Benjamin Herrenschmidt | 8f619b54 | 2014-03-28 13:36:30 +1100 | [diff] [blame] | 312 | cpu_ready_for_interrupts(); |
Benjamin Herrenschmidt | a944a9c | 2014-03-28 13:36:29 +1100 | [diff] [blame] | 313 | |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 314 | DBG(" <- early_setup()\n"); |
Benjamin Herrenschmidt | 7191b61 | 2013-07-25 12:12:32 +1000 | [diff] [blame] | 315 | |
| 316 | #ifdef CONFIG_PPC_EARLY_DEBUG_BOOTX |
| 317 | /* |
| 318 | * This needs to be done *last* (after the above DBG() even) |
| 319 | * |
| 320 | * Right after we return from this function, we turn on the MMU |
| 321 | * which means the real-mode access trick that btext does will |
| 322 | * no longer work, it needs to switch to using a real MMU |
| 323 | * mapping. This call will ensure that it does |
| 324 | */ |
| 325 | btext_map(); |
| 326 | #endif /* CONFIG_PPC_EARLY_DEBUG_BOOTX */ |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 327 | } |
| 328 | |
Paul Mackerras | 799d604 | 2005-11-10 13:37:51 +1100 | [diff] [blame] | 329 | #ifdef CONFIG_SMP |
| 330 | void early_setup_secondary(void) |
| 331 | { |
Madhavan Srinivasan | 103b782 | 2016-03-04 10:31:48 +0530 | [diff] [blame] | 332 | /* Mark interrupts disabled in PACA */ |
Benjamin Herrenschmidt | 757c74d | 2009-03-19 19:34:16 +0000 | [diff] [blame] | 333 | get_paca()->soft_enabled = 0; |
Paul Mackerras | 799d604 | 2005-11-10 13:37:51 +1100 | [diff] [blame] | 334 | |
Benjamin Herrenschmidt | 757c74d | 2009-03-19 19:34:16 +0000 | [diff] [blame] | 335 | /* Initialize the hash table or TLB handling */ |
| 336 | early_init_mmu_secondary(); |
Benjamin Herrenschmidt | a944a9c | 2014-03-28 13:36:29 +1100 | [diff] [blame] | 337 | |
| 338 | /* |
| 339 | * At this point, we can let interrupts switch to virtual mode |
| 340 | * (the MMU has been setup), so adjust the MSR in the PACA to |
| 341 | * have IR and DR set. |
| 342 | */ |
Benjamin Herrenschmidt | 8f619b54 | 2014-03-28 13:36:30 +1100 | [diff] [blame] | 343 | cpu_ready_for_interrupts(); |
Paul Mackerras | 799d604 | 2005-11-10 13:37:51 +1100 | [diff] [blame] | 344 | } |
| 345 | |
| 346 | #endif /* CONFIG_SMP */ |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 347 | |
Michael Ellerman | b8f5102 | 2005-11-04 12:09:42 +1100 | [diff] [blame] | 348 | #if defined(CONFIG_SMP) || defined(CONFIG_KEXEC) |
Scott Wood | 567cf94 | 2015-10-06 22:48:19 -0500 | [diff] [blame] | 349 | static bool use_spinloop(void) |
| 350 | { |
| 351 | if (!IS_ENABLED(CONFIG_PPC_BOOK3E)) |
| 352 | return true; |
| 353 | |
| 354 | /* |
| 355 | * When book3e boots from kexec, the ePAPR spin table does |
| 356 | * not get used. |
| 357 | */ |
| 358 | return of_property_read_bool(of_chosen, "linux,booted-from-kexec"); |
| 359 | } |
| 360 | |
Michael Ellerman | b8f5102 | 2005-11-04 12:09:42 +1100 | [diff] [blame] | 361 | void smp_release_cpus(void) |
| 362 | { |
Michael Ellerman | 758438a | 2005-12-05 15:49:00 -0600 | [diff] [blame] | 363 | unsigned long *ptr; |
Benjamin Herrenschmidt | 9d07bc8 | 2011-03-16 14:54:35 +1100 | [diff] [blame] | 364 | int i; |
Michael Ellerman | b8f5102 | 2005-11-04 12:09:42 +1100 | [diff] [blame] | 365 | |
Scott Wood | 567cf94 | 2015-10-06 22:48:19 -0500 | [diff] [blame] | 366 | if (!use_spinloop()) |
| 367 | return; |
| 368 | |
Michael Ellerman | b8f5102 | 2005-11-04 12:09:42 +1100 | [diff] [blame] | 369 | DBG(" -> smp_release_cpus()\n"); |
| 370 | |
| 371 | /* All secondary cpus are spinning on a common spinloop, release them |
| 372 | * all now so they can start to spin on their individual paca |
| 373 | * spinloops. For non SMP kernels, the secondary cpus never get out |
| 374 | * of the common spinloop. |
Paul Mackerras | 1f6a93e | 2008-08-30 11:40:24 +1000 | [diff] [blame] | 375 | */ |
Michael Ellerman | b8f5102 | 2005-11-04 12:09:42 +1100 | [diff] [blame] | 376 | |
Michael Ellerman | 758438a | 2005-12-05 15:49:00 -0600 | [diff] [blame] | 377 | ptr = (unsigned long *)((unsigned long)&__secondary_hold_spinloop |
| 378 | - PHYSICAL_START); |
Anton Blanchard | 2751b62 | 2014-03-11 11:54:06 +1100 | [diff] [blame] | 379 | *ptr = ppc_function_entry(generic_secondary_smp_init); |
Benjamin Herrenschmidt | 9d07bc8 | 2011-03-16 14:54:35 +1100 | [diff] [blame] | 380 | |
| 381 | /* And wait a bit for them to catch up */ |
| 382 | for (i = 0; i < 100000; i++) { |
| 383 | mb(); |
| 384 | HMT_low(); |
Matt Evans | 7ac87ab | 2011-05-25 18:09:12 +0000 | [diff] [blame] | 385 | if (spinning_secondaries == 0) |
Benjamin Herrenschmidt | 9d07bc8 | 2011-03-16 14:54:35 +1100 | [diff] [blame] | 386 | break; |
| 387 | udelay(1); |
| 388 | } |
Matt Evans | 7ac87ab | 2011-05-25 18:09:12 +0000 | [diff] [blame] | 389 | DBG("spinning_secondaries = %d\n", spinning_secondaries); |
Michael Ellerman | b8f5102 | 2005-11-04 12:09:42 +1100 | [diff] [blame] | 390 | |
| 391 | DBG(" <- smp_release_cpus()\n"); |
| 392 | } |
| 393 | #endif /* CONFIG_SMP || CONFIG_KEXEC */ |
| 394 | |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 395 | /* |
Paul Mackerras | 799d604 | 2005-11-10 13:37:51 +1100 | [diff] [blame] | 396 | * Initialize some remaining members of the ppc64_caches and systemcfg |
| 397 | * structures |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 398 | * (at least until we get rid of them completely). This is mostly some |
| 399 | * cache informations about the CPU that will be used by cache flush |
| 400 | * routines and/or provided to userland |
| 401 | */ |
Benjamin Herrenschmidt | b1923ca | 2016-07-05 15:07:51 +1000 | [diff] [blame] | 402 | void __init initialize_cache_info(void) |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 403 | { |
| 404 | struct device_node *np; |
| 405 | unsigned long num_cpus = 0; |
| 406 | |
| 407 | DBG(" -> initialize_cache_info()\n"); |
| 408 | |
Anton Blanchard | 94db7c5 | 2011-08-10 20:44:22 +0000 | [diff] [blame] | 409 | for_each_node_by_type(np, "cpu") { |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 410 | num_cpus += 1; |
| 411 | |
Anton Blanchard | dfbe93a | 2011-08-10 20:44:23 +0000 | [diff] [blame] | 412 | /* |
| 413 | * We're assuming *all* of the CPUs have the same |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 414 | * d-cache and i-cache sizes... -Peter |
| 415 | */ |
Anton Blanchard | dfbe93a | 2011-08-10 20:44:23 +0000 | [diff] [blame] | 416 | if (num_cpus == 1) { |
Anton Blanchard | 7946d5a | 2013-08-07 02:01:30 +1000 | [diff] [blame] | 417 | const __be32 *sizep, *lsizep; |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 418 | u32 size, lsize; |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 419 | |
| 420 | size = 0; |
| 421 | lsize = cur_cpu_spec->dcache_bsize; |
Stephen Rothwell | e2eb639 | 2007-04-03 22:26:41 +1000 | [diff] [blame] | 422 | sizep = of_get_property(np, "d-cache-size", NULL); |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 423 | if (sizep != NULL) |
Anton Blanchard | 7946d5a | 2013-08-07 02:01:30 +1000 | [diff] [blame] | 424 | size = be32_to_cpu(*sizep); |
Anton Blanchard | dfbe93a | 2011-08-10 20:44:23 +0000 | [diff] [blame] | 425 | lsizep = of_get_property(np, "d-cache-block-size", |
| 426 | NULL); |
Benjamin Herrenschmidt | 20474ab | 2007-10-28 08:49:28 +1100 | [diff] [blame] | 427 | /* fallback if block size missing */ |
| 428 | if (lsizep == NULL) |
Anton Blanchard | dfbe93a | 2011-08-10 20:44:23 +0000 | [diff] [blame] | 429 | lsizep = of_get_property(np, |
| 430 | "d-cache-line-size", |
| 431 | NULL); |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 432 | if (lsizep != NULL) |
Anton Blanchard | 7946d5a | 2013-08-07 02:01:30 +1000 | [diff] [blame] | 433 | lsize = be32_to_cpu(*lsizep); |
Anton Blanchard | b0d436c | 2013-08-07 02:01:24 +1000 | [diff] [blame] | 434 | if (sizep == NULL || lsizep == NULL) |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 435 | DBG("Argh, can't find dcache properties ! " |
| 436 | "sizep: %p, lsizep: %p\n", sizep, lsizep); |
| 437 | |
Benjamin Herrenschmidt | a7f290d | 2005-11-11 21:15:21 +1100 | [diff] [blame] | 438 | ppc64_caches.dsize = size; |
| 439 | ppc64_caches.dline_size = lsize; |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 440 | ppc64_caches.log_dline_size = __ilog2(lsize); |
| 441 | ppc64_caches.dlines_per_page = PAGE_SIZE / lsize; |
| 442 | |
| 443 | size = 0; |
| 444 | lsize = cur_cpu_spec->icache_bsize; |
Stephen Rothwell | e2eb639 | 2007-04-03 22:26:41 +1000 | [diff] [blame] | 445 | sizep = of_get_property(np, "i-cache-size", NULL); |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 446 | if (sizep != NULL) |
Anton Blanchard | 7946d5a | 2013-08-07 02:01:30 +1000 | [diff] [blame] | 447 | size = be32_to_cpu(*sizep); |
Anton Blanchard | dfbe93a | 2011-08-10 20:44:23 +0000 | [diff] [blame] | 448 | lsizep = of_get_property(np, "i-cache-block-size", |
| 449 | NULL); |
Benjamin Herrenschmidt | 20474ab | 2007-10-28 08:49:28 +1100 | [diff] [blame] | 450 | if (lsizep == NULL) |
Anton Blanchard | dfbe93a | 2011-08-10 20:44:23 +0000 | [diff] [blame] | 451 | lsizep = of_get_property(np, |
| 452 | "i-cache-line-size", |
| 453 | NULL); |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 454 | if (lsizep != NULL) |
Anton Blanchard | 7946d5a | 2013-08-07 02:01:30 +1000 | [diff] [blame] | 455 | lsize = be32_to_cpu(*lsizep); |
Anton Blanchard | b0d436c | 2013-08-07 02:01:24 +1000 | [diff] [blame] | 456 | if (sizep == NULL || lsizep == NULL) |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 457 | DBG("Argh, can't find icache properties ! " |
| 458 | "sizep: %p, lsizep: %p\n", sizep, lsizep); |
| 459 | |
Benjamin Herrenschmidt | a7f290d | 2005-11-11 21:15:21 +1100 | [diff] [blame] | 460 | ppc64_caches.isize = size; |
| 461 | ppc64_caches.iline_size = lsize; |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 462 | ppc64_caches.log_iline_size = __ilog2(lsize); |
| 463 | ppc64_caches.ilines_per_page = PAGE_SIZE / lsize; |
| 464 | } |
| 465 | } |
| 466 | |
Benjamin Herrenschmidt | 9df549a | 2016-07-05 15:04:08 +1000 | [diff] [blame] | 467 | /* For use by binfmt_elf */ |
| 468 | dcache_bsize = ppc64_caches.dline_size; |
| 469 | icache_bsize = ppc64_caches.iline_size; |
| 470 | |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 471 | DBG(" <- initialize_cache_info()\n"); |
| 472 | } |
| 473 | |
Benjamin Herrenschmidt | 40bd587 | 2011-05-03 14:07:01 +0000 | [diff] [blame] | 474 | /* This returns the limit below which memory accesses to the linear |
| 475 | * mapping are guarnateed not to cause a TLB or SLB miss. This is |
| 476 | * used to allocate interrupt or emergency stacks for which our |
| 477 | * exception entry path doesn't deal with being interrupted. |
| 478 | */ |
Benjamin Herrenschmidt | 009776b | 2016-07-05 15:07:50 +1000 | [diff] [blame] | 479 | static __init u64 safe_stack_limit(void) |
Anton Blanchard | 095c796 | 2010-05-10 18:59:18 +0000 | [diff] [blame] | 480 | { |
Benjamin Herrenschmidt | 40bd587 | 2011-05-03 14:07:01 +0000 | [diff] [blame] | 481 | #ifdef CONFIG_PPC_BOOK3E |
| 482 | /* Freescale BookE bolts the entire linear mapping */ |
| 483 | if (mmu_has_feature(MMU_FTR_TYPE_FSL_E)) |
| 484 | return linear_map_top; |
| 485 | /* Other BookE, we assume the first GB is bolted */ |
| 486 | return 1ul << 30; |
| 487 | #else |
| 488 | /* BookS, the first segment is bolted */ |
| 489 | if (mmu_has_feature(MMU_FTR_1T_SEGMENT)) |
Anton Blanchard | 095c796 | 2010-05-10 18:59:18 +0000 | [diff] [blame] | 490 | return 1UL << SID_SHIFT_1T; |
Anton Blanchard | 095c796 | 2010-05-10 18:59:18 +0000 | [diff] [blame] | 491 | return 1UL << SID_SHIFT; |
Benjamin Herrenschmidt | 40bd587 | 2011-05-03 14:07:01 +0000 | [diff] [blame] | 492 | #endif |
Anton Blanchard | 095c796 | 2010-05-10 18:59:18 +0000 | [diff] [blame] | 493 | } |
| 494 | |
Benjamin Herrenschmidt | b1923ca | 2016-07-05 15:07:51 +1000 | [diff] [blame] | 495 | void __init irqstack_early_init(void) |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 496 | { |
Benjamin Herrenschmidt | 40bd587 | 2011-05-03 14:07:01 +0000 | [diff] [blame] | 497 | u64 limit = safe_stack_limit(); |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 498 | unsigned int i; |
| 499 | |
| 500 | /* |
Anton Blanchard | 8f4da26 | 2010-12-08 00:55:03 +0000 | [diff] [blame] | 501 | * Interrupt stacks must be in the first segment since we |
| 502 | * cannot afford to take SLB misses on them. |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 503 | */ |
KAMEZAWA Hiroyuki | 0e55195 | 2006-03-28 14:50:51 -0800 | [diff] [blame] | 504 | for_each_possible_cpu(i) { |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 505 | softirq_ctx[i] = (struct thread_info *) |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 506 | __va(memblock_alloc_base(THREAD_SIZE, |
Anton Blanchard | 095c796 | 2010-05-10 18:59:18 +0000 | [diff] [blame] | 507 | THREAD_SIZE, limit)); |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 508 | hardirq_ctx[i] = (struct thread_info *) |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 509 | __va(memblock_alloc_base(THREAD_SIZE, |
Anton Blanchard | 095c796 | 2010-05-10 18:59:18 +0000 | [diff] [blame] | 510 | THREAD_SIZE, limit)); |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 511 | } |
| 512 | } |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 513 | |
Benjamin Herrenschmidt | 2d27cfd | 2009-07-23 23:15:59 +0000 | [diff] [blame] | 514 | #ifdef CONFIG_PPC_BOOK3E |
Benjamin Herrenschmidt | b1923ca | 2016-07-05 15:07:51 +1000 | [diff] [blame] | 515 | void __init exc_lvl_early_init(void) |
Benjamin Herrenschmidt | 2d27cfd | 2009-07-23 23:15:59 +0000 | [diff] [blame] | 516 | { |
| 517 | unsigned int i; |
Tiejun Chen | 160c732 | 2013-10-23 17:31:21 +0800 | [diff] [blame] | 518 | unsigned long sp; |
Benjamin Herrenschmidt | 2d27cfd | 2009-07-23 23:15:59 +0000 | [diff] [blame] | 519 | |
| 520 | for_each_possible_cpu(i) { |
Tiejun Chen | 160c732 | 2013-10-23 17:31:21 +0800 | [diff] [blame] | 521 | sp = memblock_alloc(THREAD_SIZE, THREAD_SIZE); |
| 522 | critirq_ctx[i] = (struct thread_info *)__va(sp); |
| 523 | paca[i].crit_kstack = __va(sp + THREAD_SIZE); |
| 524 | |
| 525 | sp = memblock_alloc(THREAD_SIZE, THREAD_SIZE); |
| 526 | dbgirq_ctx[i] = (struct thread_info *)__va(sp); |
| 527 | paca[i].dbg_kstack = __va(sp + THREAD_SIZE); |
| 528 | |
| 529 | sp = memblock_alloc(THREAD_SIZE, THREAD_SIZE); |
| 530 | mcheckirq_ctx[i] = (struct thread_info *)__va(sp); |
| 531 | paca[i].mc_kstack = __va(sp + THREAD_SIZE); |
Benjamin Herrenschmidt | 2d27cfd | 2009-07-23 23:15:59 +0000 | [diff] [blame] | 532 | } |
Kumar Gala | d36b4c4 | 2011-04-06 00:18:48 -0500 | [diff] [blame] | 533 | |
| 534 | if (cpu_has_feature(CPU_FTR_DEBUG_LVL_EXC)) |
Kevin Hao | 565c2f2 | 2013-05-12 07:26:23 +0800 | [diff] [blame] | 535 | patch_exception(0x040, exc_debug_debug_book3e); |
Benjamin Herrenschmidt | 2d27cfd | 2009-07-23 23:15:59 +0000 | [diff] [blame] | 536 | } |
Benjamin Herrenschmidt | 2d27cfd | 2009-07-23 23:15:59 +0000 | [diff] [blame] | 537 | #endif |
| 538 | |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 539 | /* |
| 540 | * Stack space used when we detect a bad kernel stack pointer, and |
Mahesh Salgaonkar | 729b0f7 | 2013-10-30 20:04:00 +0530 | [diff] [blame] | 541 | * early in SMP boots before relocation is enabled. Exclusive emergency |
| 542 | * stack for machine checks. |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 543 | */ |
Benjamin Herrenschmidt | b1923ca | 2016-07-05 15:07:51 +1000 | [diff] [blame] | 544 | void __init emergency_stack_init(void) |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 545 | { |
Anton Blanchard | 095c796 | 2010-05-10 18:59:18 +0000 | [diff] [blame] | 546 | u64 limit; |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 547 | unsigned int i; |
| 548 | |
| 549 | /* |
| 550 | * Emergency stacks must be under 256MB, we cannot afford to take |
| 551 | * SLB misses on them. The ABI also requires them to be 128-byte |
| 552 | * aligned. |
| 553 | * |
| 554 | * Since we use these as temporary stacks during secondary CPU |
| 555 | * bringup, we need to get at them in real mode. This means they |
| 556 | * must also be within the RMO region. |
| 557 | */ |
Benjamin Herrenschmidt | 40bd587 | 2011-05-03 14:07:01 +0000 | [diff] [blame] | 558 | limit = min(safe_stack_limit(), ppc64_rma_size); |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 559 | |
Michael Ellerman | 3243d87 | 2008-04-30 13:21:45 +1000 | [diff] [blame] | 560 | for_each_possible_cpu(i) { |
Michael Ellerman | 5d31a96 | 2016-03-24 22:04:04 +1100 | [diff] [blame] | 561 | struct thread_info *ti; |
| 562 | ti = __va(memblock_alloc_base(THREAD_SIZE, THREAD_SIZE, limit)); |
| 563 | klp_init_thread_info(ti); |
| 564 | paca[i].emergency_sp = (void *)ti + THREAD_SIZE; |
Mahesh Salgaonkar | 729b0f7 | 2013-10-30 20:04:00 +0530 | [diff] [blame] | 565 | |
| 566 | #ifdef CONFIG_PPC_BOOK3S_64 |
| 567 | /* emergency stack for machine check exception handling. */ |
Michael Ellerman | 5d31a96 | 2016-03-24 22:04:04 +1100 | [diff] [blame] | 568 | ti = __va(memblock_alloc_base(THREAD_SIZE, THREAD_SIZE, limit)); |
| 569 | klp_init_thread_info(ti); |
| 570 | paca[i].mc_emergency_sp = (void *)ti + THREAD_SIZE; |
Mahesh Salgaonkar | 729b0f7 | 2013-10-30 20:04:00 +0530 | [diff] [blame] | 571 | #endif |
Michael Ellerman | 3243d87 | 2008-04-30 13:21:45 +1000 | [diff] [blame] | 572 | } |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 573 | } |
| 574 | |
Anton Blanchard | 7a0268f | 2006-01-11 13:16:44 +1100 | [diff] [blame] | 575 | #ifdef CONFIG_SMP |
Tejun Heo | c2a7e81 | 2009-08-14 15:00:53 +0900 | [diff] [blame] | 576 | #define PCPU_DYN_SIZE () |
| 577 | |
| 578 | static void * __init pcpu_fc_alloc(unsigned int cpu, size_t size, size_t align) |
| 579 | { |
| 580 | return __alloc_bootmem_node(NODE_DATA(cpu_to_node(cpu)), size, align, |
| 581 | __pa(MAX_DMA_ADDRESS)); |
| 582 | } |
| 583 | |
| 584 | static void __init pcpu_fc_free(void *ptr, size_t size) |
| 585 | { |
| 586 | free_bootmem(__pa(ptr), size); |
| 587 | } |
| 588 | |
| 589 | static int pcpu_cpu_distance(unsigned int from, unsigned int to) |
| 590 | { |
| 591 | if (cpu_to_node(from) == cpu_to_node(to)) |
| 592 | return LOCAL_DISTANCE; |
| 593 | else |
| 594 | return REMOTE_DISTANCE; |
| 595 | } |
| 596 | |
Anton Blanchard | ae01f84 | 2010-05-31 18:45:11 +0000 | [diff] [blame] | 597 | unsigned long __per_cpu_offset[NR_CPUS] __read_mostly; |
| 598 | EXPORT_SYMBOL(__per_cpu_offset); |
| 599 | |
Anton Blanchard | 7a0268f | 2006-01-11 13:16:44 +1100 | [diff] [blame] | 600 | void __init setup_per_cpu_areas(void) |
| 601 | { |
Tejun Heo | c2a7e81 | 2009-08-14 15:00:53 +0900 | [diff] [blame] | 602 | const size_t dyn_size = PERCPU_MODULE_RESERVE + PERCPU_DYNAMIC_RESERVE; |
| 603 | size_t atom_size; |
| 604 | unsigned long delta; |
| 605 | unsigned int cpu; |
| 606 | int rc; |
Anton Blanchard | 7a0268f | 2006-01-11 13:16:44 +1100 | [diff] [blame] | 607 | |
Tejun Heo | c2a7e81 | 2009-08-14 15:00:53 +0900 | [diff] [blame] | 608 | /* |
| 609 | * Linear mapping is one of 4K, 1M and 16M. For 4K, no need |
| 610 | * to group units. For larger mappings, use 1M atom which |
| 611 | * should be large enough to contain a number of units. |
| 612 | */ |
| 613 | if (mmu_linear_psize == MMU_PAGE_4K) |
| 614 | atom_size = PAGE_SIZE; |
| 615 | else |
| 616 | atom_size = 1 << 20; |
Anton Blanchard | 7a0268f | 2006-01-11 13:16:44 +1100 | [diff] [blame] | 617 | |
Tejun Heo | c2a7e81 | 2009-08-14 15:00:53 +0900 | [diff] [blame] | 618 | rc = pcpu_embed_first_chunk(0, dyn_size, atom_size, pcpu_cpu_distance, |
| 619 | pcpu_fc_alloc, pcpu_fc_free); |
| 620 | if (rc < 0) |
| 621 | panic("cannot initialize percpu area (err=%d)", rc); |
Anton Blanchard | 7a0268f | 2006-01-11 13:16:44 +1100 | [diff] [blame] | 622 | |
Tejun Heo | c2a7e81 | 2009-08-14 15:00:53 +0900 | [diff] [blame] | 623 | delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start; |
Anton Blanchard | ae01f84 | 2010-05-31 18:45:11 +0000 | [diff] [blame] | 624 | for_each_possible_cpu(cpu) { |
| 625 | __per_cpu_offset[cpu] = delta + pcpu_unit_offsets[cpu]; |
| 626 | paca[cpu].data_offset = __per_cpu_offset[cpu]; |
| 627 | } |
Anton Blanchard | 7a0268f | 2006-01-11 13:16:44 +1100 | [diff] [blame] | 628 | } |
| 629 | #endif |
Benjamin Herrenschmidt | 4cb3cee | 2006-11-11 17:25:10 +1100 | [diff] [blame] | 630 | |
Anton Blanchard | a5d8625 | 2014-06-04 17:50:47 +1000 | [diff] [blame] | 631 | #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE |
| 632 | unsigned long memory_block_size_bytes(void) |
| 633 | { |
| 634 | if (ppc_md.memory_block_size) |
| 635 | return ppc_md.memory_block_size(); |
| 636 | |
| 637 | return MIN_MEMORY_BLOCK_SIZE; |
| 638 | } |
| 639 | #endif |
Benjamin Herrenschmidt | 4cb3cee | 2006-11-11 17:25:10 +1100 | [diff] [blame] | 640 | |
Benjamin Herrenschmidt | ecd73cc | 2013-07-15 13:03:08 +1000 | [diff] [blame] | 641 | #if defined(CONFIG_PPC_INDIRECT_PIO) || defined(CONFIG_PPC_INDIRECT_MMIO) |
Benjamin Herrenschmidt | 4cb3cee | 2006-11-11 17:25:10 +1100 | [diff] [blame] | 642 | struct ppc_pci_io ppc_pci_io; |
| 643 | EXPORT_SYMBOL(ppc_pci_io); |
Benjamin Herrenschmidt | ecd73cc | 2013-07-15 13:03:08 +1000 | [diff] [blame] | 644 | #endif |
Anton Blanchard | c54b2bf | 2015-04-09 12:52:56 +1000 | [diff] [blame] | 645 | |
| 646 | #ifdef CONFIG_HARDLOCKUP_DETECTOR |
| 647 | u64 hw_nmi_get_sample_period(int watchdog_thresh) |
| 648 | { |
| 649 | return ppc_proc_freq * watchdog_thresh; |
| 650 | } |
| 651 | |
| 652 | /* |
| 653 | * The hardlockup detector breaks PMU event based branches and is likely |
| 654 | * to get false positives in KVM guests, so disable it by default. |
| 655 | */ |
| 656 | static int __init disable_hardlockup_detector(void) |
| 657 | { |
Linus Torvalds | d19d5ef | 2015-04-16 13:53:32 -0500 | [diff] [blame] | 658 | hardlockup_detector_disable(); |
Anton Blanchard | c54b2bf | 2015-04-09 12:52:56 +1000 | [diff] [blame] | 659 | |
| 660 | return 0; |
| 661 | } |
| 662 | early_initcall(disable_hardlockup_detector); |
| 663 | #endif |