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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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070011#include <linux/module.h>
Yinghai Lu95f72d12010-07-12 14:36:09 +100012#include <linux/memblock.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070013
Michael Ellerman1426d5a2010-01-28 13:23:22 +000014#include <asm/firmware.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <asm/lppaca.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#include <asm/paca.h>
Paul Mackerras549e8152008-08-30 11:43:47 +100017#include <asm/sections.h>
Benjamin Herrenschmidtdce66702009-07-23 23:15:42 +000018#include <asm/pgtable.h>
Michael Ellerman1426d5a2010-01-28 13:23:22 +000019#include <asm/iseries/lpar_map.h>
20#include <asm/iseries/hv_types.h>
Michael Neuling1fc711f2010-05-13 19:40:11 +000021#include <asm/kexec.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022
23/* This symbol is provided by the linker - let it fill in the paca
24 * field correctly */
25extern unsigned long __toc_start;
26
Benjamin Herrenschmidt91c60b52009-06-02 21:17:41 +000027#ifdef CONFIG_PPC_BOOK3S
28
David Gibson3356bb92006-01-13 10:26:42 +110029/*
Stephen Rothwell30ff2e82008-04-10 16:43:47 +100030 * The structure which the hypervisor knows about - this structure
David Gibson3356bb92006-01-13 10:26:42 +110031 * should not cross a page boundary. The vpa_init/register_vpa call
32 * is now known to fail if the lppaca structure crosses a page
Stephen Rothwell30ff2e82008-04-10 16:43:47 +100033 * boundary. The lppaca is also used on legacy iSeries and POWER5
34 * pSeries boxes. The lppaca is 640 bytes long, and cannot readily
35 * change since the hypervisor knows its layout, so a 1kB alignment
36 * will suffice to ensure that it doesn't cross a page boundary.
David Gibson3356bb92006-01-13 10:26:42 +110037 */
38struct lppaca lppaca[] = {
Paul Mackerras93c22702010-08-12 20:18:48 +000039 [0 ... (NR_LPPACAS-1)] = {
David Gibson3356bb92006-01-13 10:26:42 +110040 .desc = 0xd397d781, /* "LpPa" */
41 .size = sizeof(struct lppaca),
42 .dyn_proc_status = 2,
43 .decr_val = 0x00ff0000,
44 .fpregs_in_use = 1,
45 .end_of_quantum = 0xfffffffffffffffful,
46 .slb_count = 64,
47 .vmxregs_in_use = 0,
Brian King40900192008-10-22 05:53:45 +000048 .page_ins = 0,
David Gibson3356bb92006-01-13 10:26:42 +110049 },
50};
51
Paul Mackerras93c22702010-08-12 20:18:48 +000052static struct lppaca *extra_lppacas;
53static long __initdata lppaca_size;
54
55static void allocate_lppacas(int nr_cpus, unsigned long limit)
56{
57 if (nr_cpus <= NR_LPPACAS)
58 return;
59
60 lppaca_size = PAGE_ALIGN(sizeof(struct lppaca) *
61 (nr_cpus - NR_LPPACAS));
62 extra_lppacas = __va(memblock_alloc_base(lppaca_size,
63 PAGE_SIZE, limit));
64}
65
66static struct lppaca *new_lppaca(int cpu)
67{
68 struct lppaca *lp;
69
70 if (cpu < NR_LPPACAS)
71 return &lppaca[cpu];
72
73 lp = extra_lppacas + (cpu - NR_LPPACAS);
74 *lp = lppaca[0];
75
76 return lp;
77}
78
79static void free_lppacas(void)
80{
81 long new_size = 0, nr;
82
83 if (!lppaca_size)
84 return;
85 nr = num_possible_cpus() - NR_LPPACAS;
86 if (nr > 0)
87 new_size = PAGE_ALIGN(nr * sizeof(struct lppaca));
88 if (new_size >= lppaca_size)
89 return;
90
91 memblock_free(__pa(extra_lppacas) + new_size, lppaca_size - new_size);
92 lppaca_size = new_size;
93}
94
95#else
96
Kumar Gala3c4b7642010-10-07 17:05:08 -050097static inline void allocate_lppacas(int nr_cpus, unsigned long limit) { }
Paul Mackerras93c22702010-08-12 20:18:48 +000098static inline void free_lppacas(void) { }
99
Benjamin Herrenschmidt91c60b52009-06-02 21:17:41 +0000100#endif /* CONFIG_PPC_BOOK3S */
101
102#ifdef CONFIG_PPC_STD_MMU_64
103
Michael Neuling2f6093c2006-08-07 16:19:19 +1000104/*
105 * 3 persistent SLBs are registered here. The buffer will be zero
106 * initially, hence will all be invaild until we actually write them.
107 */
108struct slb_shadow slb_shadow[] __cacheline_aligned = {
109 [0 ... (NR_CPUS-1)] = {
110 .persistent = SLB_NUM_BOLTED,
111 .buffer_length = sizeof(struct slb_shadow),
112 },
113};
114
Benjamin Herrenschmidt91c60b52009-06-02 21:17:41 +0000115#endif /* CONFIG_PPC_STD_MMU_64 */
116
David Gibson8882a4d2005-11-09 13:38:01 +1100117/* The Paca is an array with one entry per processor. Each contains an
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 * lppaca, which contains the information shared between the
David Gibson1888e7b2005-11-24 16:34:45 +1100119 * hypervisor and Linux.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120 * On systems with hardware multi-threading, there are two threads
121 * per processor. The Paca array must contain an entry for each thread.
122 * The VPD Areas will give a max logical processors = 2 * max physical
123 * processors. The processor VPD array needs one entry per physical
124 * processor (not thread).
125 */
Michael Ellerman1426d5a2010-01-28 13:23:22 +0000126struct paca_struct *paca;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127EXPORT_SYMBOL(paca);
Tony Breeds90035fe2008-04-24 13:43:49 +1000128
Michael Ellerman1426d5a2010-01-28 13:23:22 +0000129struct paca_struct boot_paca;
Tony Breeds90035fe2008-04-24 13:43:49 +1000130
Michael Ellerman1426d5a2010-01-28 13:23:22 +0000131void __init initialise_paca(struct paca_struct *new_paca, int cpu)
132{
133 /* The TOC register (GPR2) points 32kB into the TOC, so that 64kB
134 * of the TOC can be addressed using a single machine instruction.
135 */
Tony Breeds90035fe2008-04-24 13:43:49 +1000136 unsigned long kernel_toc = (unsigned long)(&__toc_start) + 0x8000UL;
137
Benjamin Herrenschmidt91c60b52009-06-02 21:17:41 +0000138#ifdef CONFIG_PPC_BOOK3S
Paul Mackerras93c22702010-08-12 20:18:48 +0000139 new_paca->lppaca_ptr = new_lppaca(cpu);
Benjamin Herrenschmidtdce66702009-07-23 23:15:42 +0000140#else
Michael Ellerman1426d5a2010-01-28 13:23:22 +0000141 new_paca->kernel_pgd = swapper_pg_dir;
Benjamin Herrenschmidt91c60b52009-06-02 21:17:41 +0000142#endif
Michael Ellerman1426d5a2010-01-28 13:23:22 +0000143 new_paca->lock_token = 0x8000;
144 new_paca->paca_index = cpu;
145 new_paca->kernel_toc = kernel_toc;
146 new_paca->kernelbase = (unsigned long) _stext;
147 new_paca->kernel_msr = MSR_KERNEL;
148 new_paca->hw_cpu_id = 0xffff;
Michael Neuling1fc711f2010-05-13 19:40:11 +0000149 new_paca->kexec_state = KEXEC_STATE_NONE;
Michael Ellerman1426d5a2010-01-28 13:23:22 +0000150 new_paca->__current = &init_task;
Benjamin Herrenschmidt91c60b52009-06-02 21:17:41 +0000151#ifdef CONFIG_PPC_STD_MMU_64
Michael Ellerman1426d5a2010-01-28 13:23:22 +0000152 new_paca->slb_shadow_ptr = &slb_shadow[cpu];
Benjamin Herrenschmidt91c60b52009-06-02 21:17:41 +0000153#endif /* CONFIG_PPC_STD_MMU_64 */
Michael Ellerman1426d5a2010-01-28 13:23:22 +0000154}
Tony Breeds90035fe2008-04-24 13:43:49 +1000155
Matt Evansfc53b422010-07-07 21:55:37 +0000156/* Put the paca pointer into r13 and SPRG_PACA */
157void setup_paca(struct paca_struct *new_paca)
158{
Benjamin Herrenschmidt2dd60d72011-01-20 17:50:21 +1100159 /* Setup r13 */
Matt Evansfc53b422010-07-07 21:55:37 +0000160 local_paca = new_paca;
Benjamin Herrenschmidt2dd60d72011-01-20 17:50:21 +1100161
Matt Evansfc53b422010-07-07 21:55:37 +0000162#ifdef CONFIG_PPC_BOOK3E
Benjamin Herrenschmidt2dd60d72011-01-20 17:50:21 +1100163 /* On Book3E, initialize the TLB miss exception frames */
Matt Evansfc53b422010-07-07 21:55:37 +0000164 mtspr(SPRN_SPRG_TLB_EXFRAME, local_paca->extlb);
Benjamin Herrenschmidt2dd60d72011-01-20 17:50:21 +1100165#else
166 /* In HV mode, we setup both HPACA and PACA to avoid problems
167 * if we do a GET_PACA() before the feature fixups have been
168 * applied
169 */
Paul Mackerras969391c2011-06-29 00:26:11 +0000170 if (cpu_has_feature(CPU_FTR_HVMODE))
Benjamin Herrenschmidt2dd60d72011-01-20 17:50:21 +1100171 mtspr(SPRN_SPRG_HPACA, local_paca);
Matt Evansfc53b422010-07-07 21:55:37 +0000172#endif
Benjamin Herrenschmidt2dd60d72011-01-20 17:50:21 +1100173 mtspr(SPRN_SPRG_PACA, local_paca);
174
Matt Evansfc53b422010-07-07 21:55:37 +0000175}
176
Michael Ellerman1426d5a2010-01-28 13:23:22 +0000177static int __initdata paca_size;
178
179void __init allocate_pacas(void)
180{
Milton Miller2cd947f2011-05-10 19:28:52 +0000181 int cpu, limit;
Michael Ellerman1426d5a2010-01-28 13:23:22 +0000182
183 /*
184 * We can't take SLB misses on the paca, and we want to access them
185 * in real mode, so allocate them within the RMA and also within
186 * the first segment. On iSeries they must be within the area mapped
187 * by the HV, which is HvPagesToMap * HVPAGESIZE bytes.
188 */
Benjamin Herrenschmidtcd3db0c2010-07-06 15:39:02 -0700189 limit = min(0x10000000ULL, ppc64_rma_size);
Michael Ellerman1426d5a2010-01-28 13:23:22 +0000190 if (firmware_has_feature(FW_FEATURE_ISERIES))
191 limit = min(limit, HvPagesToMap * HVPAGESIZE);
192
Milton Miller2cd947f2011-05-10 19:28:52 +0000193 paca_size = PAGE_ALIGN(sizeof(struct paca_struct) * nr_cpu_ids);
Michael Ellerman1426d5a2010-01-28 13:23:22 +0000194
Yinghai Lu95f72d12010-07-12 14:36:09 +1000195 paca = __va(memblock_alloc_base(paca_size, PAGE_SIZE, limit));
Michael Ellerman1426d5a2010-01-28 13:23:22 +0000196 memset(paca, 0, paca_size);
197
198 printk(KERN_DEBUG "Allocated %u bytes for %d pacas at %p\n",
Milton Miller2cd947f2011-05-10 19:28:52 +0000199 paca_size, nr_cpu_ids, paca);
Michael Ellerman1426d5a2010-01-28 13:23:22 +0000200
Milton Miller2cd947f2011-05-10 19:28:52 +0000201 allocate_lppacas(nr_cpu_ids, limit);
Paul Mackerras93c22702010-08-12 20:18:48 +0000202
Michael Ellerman1426d5a2010-01-28 13:23:22 +0000203 /* Can't use for_each_*_cpu, as they aren't functional yet */
Milton Miller2cd947f2011-05-10 19:28:52 +0000204 for (cpu = 0; cpu < nr_cpu_ids; cpu++)
Michael Ellerman1426d5a2010-01-28 13:23:22 +0000205 initialise_paca(&paca[cpu], cpu);
206}
207
208void __init free_unused_pacas(void)
209{
210 int new_size;
211
Ryan Grimmc1854e02011-03-31 19:33:02 +0000212 new_size = PAGE_ALIGN(sizeof(struct paca_struct) * nr_cpu_ids);
Michael Ellerman1426d5a2010-01-28 13:23:22 +0000213
214 if (new_size >= paca_size)
215 return;
216
Yinghai Lu95f72d12010-07-12 14:36:09 +1000217 memblock_free(__pa(paca) + new_size, paca_size - new_size);
Michael Ellerman1426d5a2010-01-28 13:23:22 +0000218
219 printk(KERN_DEBUG "Freed %u bytes for unused pacas\n",
220 paca_size - new_size);
221
222 paca_size = new_size;
Paul Mackerras93c22702010-08-12 20:18:48 +0000223
224 free_lppacas();
Tony Breeds90035fe2008-04-24 13:43:49 +1000225}