2 * c 2001 PPC 64 Team, IBM Corp
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.
10 #include <linux/smp.h>
11 #include <linux/export.h>
12 #include <linux/memblock.h>
13 #include <linux/sched/task.h>
14 #include <linux/numa.h>
16 #include <asm/lppaca.h>
18 #include <asm/sections.h>
19 #include <asm/pgtable.h>
20 #include <asm/kexec.h>
28 static void *__init
alloc_paca_data(unsigned long size
, unsigned long align
,
29 unsigned long limit
, int cpu
)
35 * boot_cpuid paca is allocated very early before cpu_to_node is up.
36 * Set bottom-up mode, because the boot CPU should be on node-0,
37 * which will put its paca in the right place.
39 if (cpu
== boot_cpuid
) {
41 memblock_set_bottom_up(true);
43 nid
= early_cpu_to_node(cpu
);
46 ptr
= memblock_alloc_try_nid(size
, align
, MEMBLOCK_LOW_LIMIT
,
49 panic("cannot allocate paca data");
51 if (cpu
== boot_cpuid
)
52 memblock_set_bottom_up(false);
57 #ifdef CONFIG_PPC_PSERIES
60 * See asm/lppaca.h for more detail.
62 * lppaca structures must must be 1kB in size, L1 cache line aligned,
63 * and not cross 4kB boundary. A 1kB size and 1kB alignment will satisfy
66 static inline void init_lppaca(struct lppaca
*lppaca
)
68 BUILD_BUG_ON(sizeof(struct lppaca
) != 640);
70 *lppaca
= (struct lppaca
) {
71 .desc
= cpu_to_be32(0xd397d781), /* "LpPa" */
72 .size
= cpu_to_be16(0x400),
74 .slb_count
= cpu_to_be16(64),
79 static struct lppaca
* __init
new_lppaca(int cpu
, unsigned long limit
)
84 BUILD_BUG_ON(size
< sizeof(struct lppaca
));
86 if (early_cpu_has_feature(CPU_FTR_HVMODE
))
89 lp
= alloc_paca_data(size
, 0x400, limit
, cpu
);
94 #endif /* CONFIG_PPC_BOOK3S */
96 #ifdef CONFIG_PPC_BOOK3S_64
99 * 3 persistent SLBs are allocated here. The buffer will be zero
100 * initially, hence will all be invaild until we actually write them.
102 * If you make the number of persistent SLB entries dynamic, please also
103 * update PR KVM to flush and restore them accordingly.
105 static struct slb_shadow
* __init
new_slb_shadow(int cpu
, unsigned long limit
)
107 struct slb_shadow
*s
;
109 if (cpu
!= boot_cpuid
) {
111 * Boot CPU comes here before early_radix_enabled
112 * is parsed (e.g., for disable_radix). So allocate
113 * always and this will be fixed up in free_unused_pacas.
115 if (early_radix_enabled())
119 s
= alloc_paca_data(sizeof(*s
), L1_CACHE_BYTES
, limit
, cpu
);
121 s
->persistent
= cpu_to_be32(SLB_NUM_BOLTED
);
122 s
->buffer_length
= cpu_to_be32(sizeof(*s
));
127 #endif /* CONFIG_PPC_BOOK3S_64 */
129 /* The Paca is an array with one entry per processor. Each contains an
130 * lppaca, which contains the information shared between the
131 * hypervisor and Linux.
132 * On systems with hardware multi-threading, there are two threads
133 * per processor. The Paca array must contain an entry for each thread.
134 * The VPD Areas will give a max logical processors = 2 * max physical
135 * processors. The processor VPD array needs one entry per physical
136 * processor (not thread).
138 struct paca_struct
**paca_ptrs __read_mostly
;
139 EXPORT_SYMBOL(paca_ptrs
);
141 void __init
initialise_paca(struct paca_struct
*new_paca
, int cpu
)
143 #ifdef CONFIG_PPC_PSERIES
144 new_paca
->lppaca_ptr
= NULL
;
146 #ifdef CONFIG_PPC_BOOK3E
147 new_paca
->kernel_pgd
= swapper_pg_dir
;
149 new_paca
->lock_token
= 0x8000;
150 new_paca
->paca_index
= cpu
;
151 new_paca
->kernel_toc
= kernel_toc_addr();
152 new_paca
->kernelbase
= (unsigned long) _stext
;
153 /* Only set MSR:IR/DR when MMU is initialized */
154 new_paca
->kernel_msr
= MSR_KERNEL
& ~(MSR_IR
| MSR_DR
);
155 new_paca
->hw_cpu_id
= 0xffff;
156 new_paca
->kexec_state
= KEXEC_STATE_NONE
;
157 new_paca
->__current
= &init_task
;
158 new_paca
->data_offset
= 0xfeeeeeeeeeeeeeeeULL
;
159 #ifdef CONFIG_PPC_BOOK3S_64
160 new_paca
->slb_shadow_ptr
= NULL
;
163 #ifdef CONFIG_PPC_BOOK3E
164 /* For now -- if we have threads this will be adjusted later */
165 new_paca
->tcd_ptr
= &new_paca
->tcd
;
169 /* Put the paca pointer into r13 and SPRG_PACA */
170 void setup_paca(struct paca_struct
*new_paca
)
173 local_paca
= new_paca
;
175 #ifdef CONFIG_PPC_BOOK3E
176 /* On Book3E, initialize the TLB miss exception frames */
177 mtspr(SPRN_SPRG_TLB_EXFRAME
, local_paca
->extlb
);
179 /* In HV mode, we setup both HPACA and PACA to avoid problems
180 * if we do a GET_PACA() before the feature fixups have been
183 if (early_cpu_has_feature(CPU_FTR_HVMODE
))
184 mtspr(SPRN_SPRG_HPACA
, local_paca
);
186 mtspr(SPRN_SPRG_PACA
, local_paca
);
190 static int __initdata paca_nr_cpu_ids
;
191 static int __initdata paca_ptrs_size
;
192 static int __initdata paca_struct_size
;
194 void __init
allocate_paca_ptrs(void)
196 paca_nr_cpu_ids
= nr_cpu_ids
;
198 paca_ptrs_size
= sizeof(struct paca_struct
*) * nr_cpu_ids
;
199 paca_ptrs
= __va(memblock_phys_alloc(paca_ptrs_size
, SMP_CACHE_BYTES
));
200 memset(paca_ptrs
, 0x88, paca_ptrs_size
);
203 void __init
allocate_paca(int cpu
)
206 struct paca_struct
*paca
;
208 BUG_ON(cpu
>= paca_nr_cpu_ids
);
210 #ifdef CONFIG_PPC_BOOK3S_64
212 * We access pacas in real mode, and cannot take SLB faults
213 * on them when in virtual mode, so allocate them accordingly.
215 limit
= min(ppc64_bolted_size(), ppc64_rma_size
);
217 limit
= ppc64_rma_size
;
220 paca
= alloc_paca_data(sizeof(struct paca_struct
), L1_CACHE_BYTES
,
222 paca_ptrs
[cpu
] = paca
;
224 initialise_paca(paca
, cpu
);
225 #ifdef CONFIG_PPC_PSERIES
226 paca
->lppaca_ptr
= new_lppaca(cpu
, limit
);
228 #ifdef CONFIG_PPC_BOOK3S_64
229 paca
->slb_shadow_ptr
= new_slb_shadow(cpu
, limit
);
231 paca_struct_size
+= sizeof(struct paca_struct
);
234 void __init
free_unused_pacas(void)
238 new_ptrs_size
= sizeof(struct paca_struct
*) * nr_cpu_ids
;
239 if (new_ptrs_size
< paca_ptrs_size
)
240 memblock_free(__pa(paca_ptrs
) + new_ptrs_size
,
241 paca_ptrs_size
- new_ptrs_size
);
243 paca_nr_cpu_ids
= nr_cpu_ids
;
244 paca_ptrs_size
= new_ptrs_size
;
246 #ifdef CONFIG_PPC_BOOK3S_64
247 if (early_radix_enabled()) {
248 /* Ugly fixup, see new_slb_shadow() */
249 memblock_free(__pa(paca_ptrs
[boot_cpuid
]->slb_shadow_ptr
),
250 sizeof(struct slb_shadow
));
251 paca_ptrs
[boot_cpuid
]->slb_shadow_ptr
= NULL
;
255 printk(KERN_DEBUG
"Allocated %u bytes for %u pacas\n",
256 paca_ptrs_size
+ paca_struct_size
, nr_cpu_ids
);
259 void copy_mm_to_paca(struct mm_struct
*mm
)
261 #ifdef CONFIG_PPC_BOOK3S
262 mm_context_t
*context
= &mm
->context
;
264 get_paca()->mm_ctx_id
= context
->id
;
265 #ifdef CONFIG_PPC_MM_SLICES
266 VM_BUG_ON(!mm
->context
.slb_addr_limit
);
267 get_paca()->mm_ctx_slb_addr_limit
= mm
->context
.slb_addr_limit
;
268 memcpy(&get_paca()->mm_ctx_low_slices_psize
,
269 &context
->low_slices_psize
, sizeof(context
->low_slices_psize
));
270 memcpy(&get_paca()->mm_ctx_high_slices_psize
,
271 &context
->high_slices_psize
, TASK_SLICE_ARRAY_SZ(mm
));
272 #else /* CONFIG_PPC_MM_SLICES */
273 get_paca()->mm_ctx_user_psize
= context
->user_psize
;
274 get_paca()->mm_ctx_sllp
= context
->sllp
;
276 #else /* !CONFIG_PPC_BOOK3S */