Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * c 2001 PPC 64 Team, IBM Corp |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License |
| 6 | * as published by the Free Software Foundation; either version |
| 7 | * 2 of the License, or (at your option) any later version. |
| 8 | */ |
| 9 | |
Milton Miller | 2cd947f | 2011-05-10 19:28:52 +0000 | [diff] [blame] | 10 | #include <linux/smp.h> |
Paul Gortmaker | 4b16f8e | 2011-07-22 18:24:23 -0400 | [diff] [blame] | 11 | #include <linux/export.h> |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 12 | #include <linux/memblock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #include <asm/lppaca.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <asm/paca.h> |
Paul Mackerras | 549e815 | 2008-08-30 11:43:47 +1000 | [diff] [blame] | 16 | #include <asm/sections.h> |
Benjamin Herrenschmidt | dce6670 | 2009-07-23 23:15:42 +0000 | [diff] [blame] | 17 | #include <asm/pgtable.h> |
Michael Neuling | 1fc711f | 2010-05-13 19:40:11 +0000 | [diff] [blame] | 18 | #include <asm/kexec.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | |
| 20 | /* This symbol is provided by the linker - let it fill in the paca |
| 21 | * field correctly */ |
| 22 | extern unsigned long __toc_start; |
| 23 | |
Benjamin Herrenschmidt | 91c60b5 | 2009-06-02 21:17:41 +0000 | [diff] [blame] | 24 | #ifdef CONFIG_PPC_BOOK3S |
| 25 | |
David Gibson | 3356bb9f7 | 2006-01-13 10:26:42 +1100 | [diff] [blame] | 26 | /* |
Stephen Rothwell | 30ff2e8 | 2008-04-10 16:43:47 +1000 | [diff] [blame] | 27 | * The structure which the hypervisor knows about - this structure |
David Gibson | 3356bb9f7 | 2006-01-13 10:26:42 +1100 | [diff] [blame] | 28 | * should not cross a page boundary. The vpa_init/register_vpa call |
| 29 | * is now known to fail if the lppaca structure crosses a page |
Stephen Rothwell | f533927 | 2012-03-15 18:18:00 +0000 | [diff] [blame] | 30 | * boundary. The lppaca is also used on POWER5 pSeries boxes. |
| 31 | * The lppaca is 640 bytes long, and cannot readily |
Stephen Rothwell | 30ff2e8 | 2008-04-10 16:43:47 +1000 | [diff] [blame] | 32 | * change since the hypervisor knows its layout, so a 1kB alignment |
| 33 | * will suffice to ensure that it doesn't cross a page boundary. |
David Gibson | 3356bb9f7 | 2006-01-13 10:26:42 +1100 | [diff] [blame] | 34 | */ |
| 35 | struct lppaca lppaca[] = { |
Paul Mackerras | 93c2270 | 2010-08-12 20:18:48 +0000 | [diff] [blame] | 36 | [0 ... (NR_LPPACAS-1)] = { |
David Gibson | 3356bb9f7 | 2006-01-13 10:26:42 +1100 | [diff] [blame] | 37 | .desc = 0xd397d781, /* "LpPa" */ |
| 38 | .size = sizeof(struct lppaca), |
David Gibson | 3356bb9f7 | 2006-01-13 10:26:42 +1100 | [diff] [blame] | 39 | .fpregs_in_use = 1, |
David Gibson | 3356bb9f7 | 2006-01-13 10:26:42 +1100 | [diff] [blame] | 40 | .slb_count = 64, |
| 41 | .vmxregs_in_use = 0, |
Brian King | 4090019 | 2008-10-22 05:53:45 +0000 | [diff] [blame] | 42 | .page_ins = 0, |
David Gibson | 3356bb9f7 | 2006-01-13 10:26:42 +1100 | [diff] [blame] | 43 | }, |
| 44 | }; |
| 45 | |
Paul Mackerras | 93c2270 | 2010-08-12 20:18:48 +0000 | [diff] [blame] | 46 | static struct lppaca *extra_lppacas; |
| 47 | static long __initdata lppaca_size; |
| 48 | |
| 49 | static void allocate_lppacas(int nr_cpus, unsigned long limit) |
| 50 | { |
| 51 | if (nr_cpus <= NR_LPPACAS) |
| 52 | return; |
| 53 | |
| 54 | lppaca_size = PAGE_ALIGN(sizeof(struct lppaca) * |
| 55 | (nr_cpus - NR_LPPACAS)); |
| 56 | extra_lppacas = __va(memblock_alloc_base(lppaca_size, |
| 57 | PAGE_SIZE, limit)); |
| 58 | } |
| 59 | |
| 60 | static struct lppaca *new_lppaca(int cpu) |
| 61 | { |
| 62 | struct lppaca *lp; |
| 63 | |
| 64 | if (cpu < NR_LPPACAS) |
| 65 | return &lppaca[cpu]; |
| 66 | |
| 67 | lp = extra_lppacas + (cpu - NR_LPPACAS); |
| 68 | *lp = lppaca[0]; |
| 69 | |
| 70 | return lp; |
| 71 | } |
| 72 | |
| 73 | static void free_lppacas(void) |
| 74 | { |
| 75 | long new_size = 0, nr; |
| 76 | |
| 77 | if (!lppaca_size) |
| 78 | return; |
| 79 | nr = num_possible_cpus() - NR_LPPACAS; |
| 80 | if (nr > 0) |
| 81 | new_size = PAGE_ALIGN(nr * sizeof(struct lppaca)); |
| 82 | if (new_size >= lppaca_size) |
| 83 | return; |
| 84 | |
| 85 | memblock_free(__pa(extra_lppacas) + new_size, lppaca_size - new_size); |
| 86 | lppaca_size = new_size; |
| 87 | } |
| 88 | |
| 89 | #else |
| 90 | |
Kumar Gala | 3c4b764 | 2010-10-07 17:05:08 -0500 | [diff] [blame] | 91 | static inline void allocate_lppacas(int nr_cpus, unsigned long limit) { } |
Paul Mackerras | 93c2270 | 2010-08-12 20:18:48 +0000 | [diff] [blame] | 92 | static inline void free_lppacas(void) { } |
| 93 | |
Benjamin Herrenschmidt | 91c60b5 | 2009-06-02 21:17:41 +0000 | [diff] [blame] | 94 | #endif /* CONFIG_PPC_BOOK3S */ |
| 95 | |
| 96 | #ifdef CONFIG_PPC_STD_MMU_64 |
| 97 | |
Michael Neuling | 2f6093c | 2006-08-07 16:19:19 +1000 | [diff] [blame] | 98 | /* |
| 99 | * 3 persistent SLBs are registered here. The buffer will be zero |
| 100 | * initially, hence will all be invaild until we actually write them. |
| 101 | */ |
| 102 | struct slb_shadow slb_shadow[] __cacheline_aligned = { |
| 103 | [0 ... (NR_CPUS-1)] = { |
| 104 | .persistent = SLB_NUM_BOLTED, |
| 105 | .buffer_length = sizeof(struct slb_shadow), |
| 106 | }, |
| 107 | }; |
| 108 | |
Benjamin Herrenschmidt | 91c60b5 | 2009-06-02 21:17:41 +0000 | [diff] [blame] | 109 | #endif /* CONFIG_PPC_STD_MMU_64 */ |
| 110 | |
David Gibson | 8882a4d | 2005-11-09 13:38:01 +1100 | [diff] [blame] | 111 | /* The Paca is an array with one entry per processor. Each contains an |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | * lppaca, which contains the information shared between the |
David Gibson | 1888e7b | 2005-11-24 16:34:45 +1100 | [diff] [blame] | 113 | * hypervisor and Linux. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | * On systems with hardware multi-threading, there are two threads |
| 115 | * per processor. The Paca array must contain an entry for each thread. |
| 116 | * The VPD Areas will give a max logical processors = 2 * max physical |
| 117 | * processors. The processor VPD array needs one entry per physical |
| 118 | * processor (not thread). |
| 119 | */ |
Michael Ellerman | 1426d5a | 2010-01-28 13:23:22 +0000 | [diff] [blame] | 120 | struct paca_struct *paca; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | EXPORT_SYMBOL(paca); |
Tony Breeds | 90035fe | 2008-04-24 13:43:49 +1000 | [diff] [blame] | 122 | |
Michael Ellerman | 1426d5a | 2010-01-28 13:23:22 +0000 | [diff] [blame] | 123 | struct paca_struct boot_paca; |
Tony Breeds | 90035fe | 2008-04-24 13:43:49 +1000 | [diff] [blame] | 124 | |
Michael Ellerman | 1426d5a | 2010-01-28 13:23:22 +0000 | [diff] [blame] | 125 | void __init initialise_paca(struct paca_struct *new_paca, int cpu) |
| 126 | { |
| 127 | /* The TOC register (GPR2) points 32kB into the TOC, so that 64kB |
| 128 | * of the TOC can be addressed using a single machine instruction. |
| 129 | */ |
Tony Breeds | 90035fe | 2008-04-24 13:43:49 +1000 | [diff] [blame] | 130 | unsigned long kernel_toc = (unsigned long)(&__toc_start) + 0x8000UL; |
| 131 | |
Benjamin Herrenschmidt | 91c60b5 | 2009-06-02 21:17:41 +0000 | [diff] [blame] | 132 | #ifdef CONFIG_PPC_BOOK3S |
Paul Mackerras | 93c2270 | 2010-08-12 20:18:48 +0000 | [diff] [blame] | 133 | new_paca->lppaca_ptr = new_lppaca(cpu); |
Benjamin Herrenschmidt | dce6670 | 2009-07-23 23:15:42 +0000 | [diff] [blame] | 134 | #else |
Michael Ellerman | 1426d5a | 2010-01-28 13:23:22 +0000 | [diff] [blame] | 135 | new_paca->kernel_pgd = swapper_pg_dir; |
Benjamin Herrenschmidt | 91c60b5 | 2009-06-02 21:17:41 +0000 | [diff] [blame] | 136 | #endif |
Michael Ellerman | 1426d5a | 2010-01-28 13:23:22 +0000 | [diff] [blame] | 137 | new_paca->lock_token = 0x8000; |
| 138 | new_paca->paca_index = cpu; |
| 139 | new_paca->kernel_toc = kernel_toc; |
| 140 | new_paca->kernelbase = (unsigned long) _stext; |
| 141 | new_paca->kernel_msr = MSR_KERNEL; |
| 142 | new_paca->hw_cpu_id = 0xffff; |
Michael Neuling | 1fc711f | 2010-05-13 19:40:11 +0000 | [diff] [blame] | 143 | new_paca->kexec_state = KEXEC_STATE_NONE; |
Michael Ellerman | 1426d5a | 2010-01-28 13:23:22 +0000 | [diff] [blame] | 144 | new_paca->__current = &init_task; |
Michael Ellerman | 407821a | 2012-09-07 15:31:44 +0000 | [diff] [blame] | 145 | new_paca->data_offset = 0xfeeeeeeeeeeeeeeeULL; |
Benjamin Herrenschmidt | 91c60b5 | 2009-06-02 21:17:41 +0000 | [diff] [blame] | 146 | #ifdef CONFIG_PPC_STD_MMU_64 |
Michael Ellerman | 1426d5a | 2010-01-28 13:23:22 +0000 | [diff] [blame] | 147 | new_paca->slb_shadow_ptr = &slb_shadow[cpu]; |
Benjamin Herrenschmidt | 91c60b5 | 2009-06-02 21:17:41 +0000 | [diff] [blame] | 148 | #endif /* CONFIG_PPC_STD_MMU_64 */ |
Michael Ellerman | 1426d5a | 2010-01-28 13:23:22 +0000 | [diff] [blame] | 149 | } |
Tony Breeds | 90035fe | 2008-04-24 13:43:49 +1000 | [diff] [blame] | 150 | |
Matt Evans | fc53b42 | 2010-07-07 21:55:37 +0000 | [diff] [blame] | 151 | /* Put the paca pointer into r13 and SPRG_PACA */ |
| 152 | void setup_paca(struct paca_struct *new_paca) |
| 153 | { |
Benjamin Herrenschmidt | 2dd60d7 | 2011-01-20 17:50:21 +1100 | [diff] [blame] | 154 | /* Setup r13 */ |
Matt Evans | fc53b42 | 2010-07-07 21:55:37 +0000 | [diff] [blame] | 155 | local_paca = new_paca; |
Benjamin Herrenschmidt | 2dd60d7 | 2011-01-20 17:50:21 +1100 | [diff] [blame] | 156 | |
Matt Evans | fc53b42 | 2010-07-07 21:55:37 +0000 | [diff] [blame] | 157 | #ifdef CONFIG_PPC_BOOK3E |
Benjamin Herrenschmidt | 2dd60d7 | 2011-01-20 17:50:21 +1100 | [diff] [blame] | 158 | /* On Book3E, initialize the TLB miss exception frames */ |
Matt Evans | fc53b42 | 2010-07-07 21:55:37 +0000 | [diff] [blame] | 159 | mtspr(SPRN_SPRG_TLB_EXFRAME, local_paca->extlb); |
Benjamin Herrenschmidt | 2dd60d7 | 2011-01-20 17:50:21 +1100 | [diff] [blame] | 160 | #else |
| 161 | /* In HV mode, we setup both HPACA and PACA to avoid problems |
| 162 | * if we do a GET_PACA() before the feature fixups have been |
| 163 | * applied |
| 164 | */ |
Paul Mackerras | 969391c | 2011-06-29 00:26:11 +0000 | [diff] [blame] | 165 | if (cpu_has_feature(CPU_FTR_HVMODE)) |
Benjamin Herrenschmidt | 2dd60d7 | 2011-01-20 17:50:21 +1100 | [diff] [blame] | 166 | mtspr(SPRN_SPRG_HPACA, local_paca); |
Matt Evans | fc53b42 | 2010-07-07 21:55:37 +0000 | [diff] [blame] | 167 | #endif |
Benjamin Herrenschmidt | 2dd60d7 | 2011-01-20 17:50:21 +1100 | [diff] [blame] | 168 | mtspr(SPRN_SPRG_PACA, local_paca); |
| 169 | |
Matt Evans | fc53b42 | 2010-07-07 21:55:37 +0000 | [diff] [blame] | 170 | } |
| 171 | |
Michael Ellerman | 1426d5a | 2010-01-28 13:23:22 +0000 | [diff] [blame] | 172 | static int __initdata paca_size; |
| 173 | |
| 174 | void __init allocate_pacas(void) |
| 175 | { |
Milton Miller | 2cd947f | 2011-05-10 19:28:52 +0000 | [diff] [blame] | 176 | int cpu, limit; |
Michael Ellerman | 1426d5a | 2010-01-28 13:23:22 +0000 | [diff] [blame] | 177 | |
| 178 | /* |
| 179 | * We can't take SLB misses on the paca, and we want to access them |
| 180 | * in real mode, so allocate them within the RMA and also within |
Stephen Rothwell | f533927 | 2012-03-15 18:18:00 +0000 | [diff] [blame] | 181 | * the first segment. |
Michael Ellerman | 1426d5a | 2010-01-28 13:23:22 +0000 | [diff] [blame] | 182 | */ |
Benjamin Herrenschmidt | cd3db0c | 2010-07-06 15:39:02 -0700 | [diff] [blame] | 183 | limit = min(0x10000000ULL, ppc64_rma_size); |
Michael Ellerman | 1426d5a | 2010-01-28 13:23:22 +0000 | [diff] [blame] | 184 | |
Milton Miller | 2cd947f | 2011-05-10 19:28:52 +0000 | [diff] [blame] | 185 | paca_size = PAGE_ALIGN(sizeof(struct paca_struct) * nr_cpu_ids); |
Michael Ellerman | 1426d5a | 2010-01-28 13:23:22 +0000 | [diff] [blame] | 186 | |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 187 | paca = __va(memblock_alloc_base(paca_size, PAGE_SIZE, limit)); |
Michael Ellerman | 1426d5a | 2010-01-28 13:23:22 +0000 | [diff] [blame] | 188 | memset(paca, 0, paca_size); |
| 189 | |
| 190 | printk(KERN_DEBUG "Allocated %u bytes for %d pacas at %p\n", |
Milton Miller | 2cd947f | 2011-05-10 19:28:52 +0000 | [diff] [blame] | 191 | paca_size, nr_cpu_ids, paca); |
Michael Ellerman | 1426d5a | 2010-01-28 13:23:22 +0000 | [diff] [blame] | 192 | |
Milton Miller | 2cd947f | 2011-05-10 19:28:52 +0000 | [diff] [blame] | 193 | allocate_lppacas(nr_cpu_ids, limit); |
Paul Mackerras | 93c2270 | 2010-08-12 20:18:48 +0000 | [diff] [blame] | 194 | |
Michael Ellerman | 1426d5a | 2010-01-28 13:23:22 +0000 | [diff] [blame] | 195 | /* Can't use for_each_*_cpu, as they aren't functional yet */ |
Milton Miller | 2cd947f | 2011-05-10 19:28:52 +0000 | [diff] [blame] | 196 | for (cpu = 0; cpu < nr_cpu_ids; cpu++) |
Michael Ellerman | 1426d5a | 2010-01-28 13:23:22 +0000 | [diff] [blame] | 197 | initialise_paca(&paca[cpu], cpu); |
| 198 | } |
| 199 | |
| 200 | void __init free_unused_pacas(void) |
| 201 | { |
| 202 | int new_size; |
| 203 | |
Ryan Grimm | c1854e0 | 2011-03-31 19:33:02 +0000 | [diff] [blame] | 204 | new_size = PAGE_ALIGN(sizeof(struct paca_struct) * nr_cpu_ids); |
Michael Ellerman | 1426d5a | 2010-01-28 13:23:22 +0000 | [diff] [blame] | 205 | |
| 206 | if (new_size >= paca_size) |
| 207 | return; |
| 208 | |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 209 | memblock_free(__pa(paca) + new_size, paca_size - new_size); |
Michael Ellerman | 1426d5a | 2010-01-28 13:23:22 +0000 | [diff] [blame] | 210 | |
| 211 | printk(KERN_DEBUG "Freed %u bytes for unused pacas\n", |
| 212 | paca_size - new_size); |
| 213 | |
| 214 | paca_size = new_size; |
Paul Mackerras | 93c2270 | 2010-08-12 20:18:48 +0000 | [diff] [blame] | 215 | |
| 216 | free_lppacas(); |
Tony Breeds | 90035fe | 2008-04-24 13:43:49 +1000 | [diff] [blame] | 217 | } |