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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 Miller2cd947f2011-05-10 19:28:52 +000010#include <linux/smp.h>
Paul Gortmaker4b16f8e2011-07-22 18:24:23 -040011#include <linux/export.h>
Yinghai Lu95f72d12010-07-12 14:36:09 +100012#include <linux/memblock.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070013
Linus Torvalds1da177e2005-04-16 15:20:36 -070014#include <asm/lppaca.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <asm/paca.h>
Paul Mackerras549e8152008-08-30 11:43:47 +100016#include <asm/sections.h>
Benjamin Herrenschmidtdce66702009-07-23 23:15:42 +000017#include <asm/pgtable.h>
Michael Neuling1fc711f2010-05-13 19:40:11 +000018#include <asm/kexec.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019
20/* This symbol is provided by the linker - let it fill in the paca
21 * field correctly */
22extern unsigned long __toc_start;
23
Benjamin Herrenschmidt91c60b52009-06-02 21:17:41 +000024#ifdef CONFIG_PPC_BOOK3S
25
David Gibson3356bb9f72006-01-13 10:26:42 +110026/*
Stephen Rothwell30ff2e82008-04-10 16:43:47 +100027 * The structure which the hypervisor knows about - this structure
David Gibson3356bb9f72006-01-13 10:26:42 +110028 * 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 Rothwellf5339272012-03-15 18:18:00 +000030 * boundary. The lppaca is also used on POWER5 pSeries boxes.
31 * The lppaca is 640 bytes long, and cannot readily
Stephen Rothwell30ff2e82008-04-10 16:43:47 +100032 * 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 Gibson3356bb9f72006-01-13 10:26:42 +110034 */
35struct lppaca lppaca[] = {
Paul Mackerras93c22702010-08-12 20:18:48 +000036 [0 ... (NR_LPPACAS-1)] = {
David Gibson3356bb9f72006-01-13 10:26:42 +110037 .desc = 0xd397d781, /* "LpPa" */
38 .size = sizeof(struct lppaca),
David Gibson3356bb9f72006-01-13 10:26:42 +110039 .fpregs_in_use = 1,
David Gibson3356bb9f72006-01-13 10:26:42 +110040 .slb_count = 64,
41 .vmxregs_in_use = 0,
Brian King40900192008-10-22 05:53:45 +000042 .page_ins = 0,
David Gibson3356bb9f72006-01-13 10:26:42 +110043 },
44};
45
Paul Mackerras93c22702010-08-12 20:18:48 +000046static struct lppaca *extra_lppacas;
47static long __initdata lppaca_size;
48
49static 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
60static 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
73static 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 Gala3c4b7642010-10-07 17:05:08 -050091static inline void allocate_lppacas(int nr_cpus, unsigned long limit) { }
Paul Mackerras93c22702010-08-12 20:18:48 +000092static inline void free_lppacas(void) { }
93
Benjamin Herrenschmidt91c60b52009-06-02 21:17:41 +000094#endif /* CONFIG_PPC_BOOK3S */
95
96#ifdef CONFIG_PPC_STD_MMU_64
97
Michael Neuling2f6093c2006-08-07 16:19:19 +100098/*
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 */
102struct 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 Herrenschmidt91c60b52009-06-02 21:17:41 +0000109#endif /* CONFIG_PPC_STD_MMU_64 */
110
David Gibson8882a4d2005-11-09 13:38:01 +1100111/* The Paca is an array with one entry per processor. Each contains an
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 * lppaca, which contains the information shared between the
David Gibson1888e7b2005-11-24 16:34:45 +1100113 * hypervisor and Linux.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 * 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 Ellerman1426d5a2010-01-28 13:23:22 +0000120struct paca_struct *paca;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121EXPORT_SYMBOL(paca);
Tony Breeds90035fe2008-04-24 13:43:49 +1000122
Michael Ellerman1426d5a2010-01-28 13:23:22 +0000123struct paca_struct boot_paca;
Tony Breeds90035fe2008-04-24 13:43:49 +1000124
Michael Ellerman1426d5a2010-01-28 13:23:22 +0000125void __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 Breeds90035fe2008-04-24 13:43:49 +1000130 unsigned long kernel_toc = (unsigned long)(&__toc_start) + 0x8000UL;
131
Benjamin Herrenschmidt91c60b52009-06-02 21:17:41 +0000132#ifdef CONFIG_PPC_BOOK3S
Paul Mackerras93c22702010-08-12 20:18:48 +0000133 new_paca->lppaca_ptr = new_lppaca(cpu);
Benjamin Herrenschmidtdce66702009-07-23 23:15:42 +0000134#else
Michael Ellerman1426d5a2010-01-28 13:23:22 +0000135 new_paca->kernel_pgd = swapper_pg_dir;
Benjamin Herrenschmidt91c60b52009-06-02 21:17:41 +0000136#endif
Michael Ellerman1426d5a2010-01-28 13:23:22 +0000137 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 Neuling1fc711f2010-05-13 19:40:11 +0000143 new_paca->kexec_state = KEXEC_STATE_NONE;
Michael Ellerman1426d5a2010-01-28 13:23:22 +0000144 new_paca->__current = &init_task;
Michael Ellerman407821a2012-09-07 15:31:44 +0000145 new_paca->data_offset = 0xfeeeeeeeeeeeeeeeULL;
Benjamin Herrenschmidt91c60b52009-06-02 21:17:41 +0000146#ifdef CONFIG_PPC_STD_MMU_64
Michael Ellerman1426d5a2010-01-28 13:23:22 +0000147 new_paca->slb_shadow_ptr = &slb_shadow[cpu];
Benjamin Herrenschmidt91c60b52009-06-02 21:17:41 +0000148#endif /* CONFIG_PPC_STD_MMU_64 */
Michael Ellerman1426d5a2010-01-28 13:23:22 +0000149}
Tony Breeds90035fe2008-04-24 13:43:49 +1000150
Matt Evansfc53b422010-07-07 21:55:37 +0000151/* Put the paca pointer into r13 and SPRG_PACA */
152void setup_paca(struct paca_struct *new_paca)
153{
Benjamin Herrenschmidt2dd60d72011-01-20 17:50:21 +1100154 /* Setup r13 */
Matt Evansfc53b422010-07-07 21:55:37 +0000155 local_paca = new_paca;
Benjamin Herrenschmidt2dd60d72011-01-20 17:50:21 +1100156
Matt Evansfc53b422010-07-07 21:55:37 +0000157#ifdef CONFIG_PPC_BOOK3E
Benjamin Herrenschmidt2dd60d72011-01-20 17:50:21 +1100158 /* On Book3E, initialize the TLB miss exception frames */
Matt Evansfc53b422010-07-07 21:55:37 +0000159 mtspr(SPRN_SPRG_TLB_EXFRAME, local_paca->extlb);
Benjamin Herrenschmidt2dd60d72011-01-20 17:50:21 +1100160#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 Mackerras969391c2011-06-29 00:26:11 +0000165 if (cpu_has_feature(CPU_FTR_HVMODE))
Benjamin Herrenschmidt2dd60d72011-01-20 17:50:21 +1100166 mtspr(SPRN_SPRG_HPACA, local_paca);
Matt Evansfc53b422010-07-07 21:55:37 +0000167#endif
Benjamin Herrenschmidt2dd60d72011-01-20 17:50:21 +1100168 mtspr(SPRN_SPRG_PACA, local_paca);
169
Matt Evansfc53b422010-07-07 21:55:37 +0000170}
171
Michael Ellerman1426d5a2010-01-28 13:23:22 +0000172static int __initdata paca_size;
173
174void __init allocate_pacas(void)
175{
Milton Miller2cd947f2011-05-10 19:28:52 +0000176 int cpu, limit;
Michael Ellerman1426d5a2010-01-28 13:23:22 +0000177
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 Rothwellf5339272012-03-15 18:18:00 +0000181 * the first segment.
Michael Ellerman1426d5a2010-01-28 13:23:22 +0000182 */
Benjamin Herrenschmidtcd3db0c2010-07-06 15:39:02 -0700183 limit = min(0x10000000ULL, ppc64_rma_size);
Michael Ellerman1426d5a2010-01-28 13:23:22 +0000184
Milton Miller2cd947f2011-05-10 19:28:52 +0000185 paca_size = PAGE_ALIGN(sizeof(struct paca_struct) * nr_cpu_ids);
Michael Ellerman1426d5a2010-01-28 13:23:22 +0000186
Yinghai Lu95f72d12010-07-12 14:36:09 +1000187 paca = __va(memblock_alloc_base(paca_size, PAGE_SIZE, limit));
Michael Ellerman1426d5a2010-01-28 13:23:22 +0000188 memset(paca, 0, paca_size);
189
190 printk(KERN_DEBUG "Allocated %u bytes for %d pacas at %p\n",
Milton Miller2cd947f2011-05-10 19:28:52 +0000191 paca_size, nr_cpu_ids, paca);
Michael Ellerman1426d5a2010-01-28 13:23:22 +0000192
Milton Miller2cd947f2011-05-10 19:28:52 +0000193 allocate_lppacas(nr_cpu_ids, limit);
Paul Mackerras93c22702010-08-12 20:18:48 +0000194
Michael Ellerman1426d5a2010-01-28 13:23:22 +0000195 /* Can't use for_each_*_cpu, as they aren't functional yet */
Milton Miller2cd947f2011-05-10 19:28:52 +0000196 for (cpu = 0; cpu < nr_cpu_ids; cpu++)
Michael Ellerman1426d5a2010-01-28 13:23:22 +0000197 initialise_paca(&paca[cpu], cpu);
198}
199
200void __init free_unused_pacas(void)
201{
202 int new_size;
203
Ryan Grimmc1854e02011-03-31 19:33:02 +0000204 new_size = PAGE_ALIGN(sizeof(struct paca_struct) * nr_cpu_ids);
Michael Ellerman1426d5a2010-01-28 13:23:22 +0000205
206 if (new_size >= paca_size)
207 return;
208
Yinghai Lu95f72d12010-07-12 14:36:09 +1000209 memblock_free(__pa(paca) + new_size, paca_size - new_size);
Michael Ellerman1426d5a2010-01-28 13:23:22 +0000210
211 printk(KERN_DEBUG "Freed %u bytes for unused pacas\n",
212 paca_size - new_size);
213
214 paca_size = new_size;
Paul Mackerras93c22702010-08-12 20:18:48 +0000215
216 free_lppacas();
Tony Breeds90035fe2008-04-24 13:43:49 +1000217}