1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * c 2001 PPC 64 Team, IBM Corp
7 #include <linux/export.h>
8 #include <linux/memblock.h>
9 #include <linux/sched/task.h>
10 #include <linux/numa.h>
11 #include <linux/pgtable.h>
13 #include <asm/lppaca.h>
15 #include <asm/sections.h>
16 #include <asm/kexec.h>
18 #include <asm/ultravisor.h>
27 static void *__init alloc_paca_data(unsigned long size, unsigned long align,
28 unsigned long limit, int cpu)
34 * boot_cpuid paca is allocated very early before cpu_to_node is up.
35 * Set bottom-up mode, because the boot CPU should be on node-0,
36 * which will put its paca in the right place.
38 if (cpu == boot_cpuid) {
40 memblock_set_bottom_up(true);
42 nid = early_cpu_to_node(cpu);
45 ptr = memblock_alloc_try_nid(size, align, MEMBLOCK_LOW_LIMIT,
48 panic("cannot allocate paca data");
50 if (cpu == boot_cpuid)
51 memblock_set_bottom_up(false);
56 #ifdef CONFIG_PPC_PSERIES
58 #define LPPACA_SIZE 0x400
60 static void *__init alloc_shared_lppaca(unsigned long size, unsigned long align,
61 unsigned long limit, int cpu)
63 size_t shared_lppaca_total_size = PAGE_ALIGN(nr_cpu_ids * LPPACA_SIZE);
64 static unsigned long shared_lppaca_size;
65 static void *shared_lppaca;
69 memblock_set_bottom_up(true);
72 memblock_alloc_try_nid(shared_lppaca_total_size,
73 PAGE_SIZE, MEMBLOCK_LOW_LIMIT,
76 panic("cannot allocate shared data");
78 memblock_set_bottom_up(false);
79 uv_share_page(PHYS_PFN(__pa(shared_lppaca)),
80 shared_lppaca_total_size >> PAGE_SHIFT);
83 ptr = shared_lppaca + shared_lppaca_size;
84 shared_lppaca_size += size;
87 * This is very early in boot, so no harm done if the kernel crashes at
90 BUG_ON(shared_lppaca_size >= shared_lppaca_total_size);
96 * See asm/lppaca.h for more detail.
98 * lppaca structures must must be 1kB in size, L1 cache line aligned,
99 * and not cross 4kB boundary. A 1kB size and 1kB alignment will satisfy
100 * these requirements.
102 static inline void init_lppaca(struct lppaca *lppaca)
104 BUILD_BUG_ON(sizeof(struct lppaca) != 640);
106 *lppaca = (struct lppaca) {
107 .desc = cpu_to_be32(0xd397d781), /* "LpPa" */
108 .size = cpu_to_be16(LPPACA_SIZE),
110 .slb_count = cpu_to_be16(64),
115 static struct lppaca * __init new_lppaca(int cpu, unsigned long limit)
119 BUILD_BUG_ON(sizeof(struct lppaca) > LPPACA_SIZE);
121 if (early_cpu_has_feature(CPU_FTR_HVMODE))
124 if (is_secure_guest())
125 lp = alloc_shared_lppaca(LPPACA_SIZE, 0x400, limit, cpu);
127 lp = alloc_paca_data(LPPACA_SIZE, 0x400, limit, cpu);
133 #endif /* CONFIG_PPC_PSERIES */
135 #ifdef CONFIG_PPC_BOOK3S_64
138 * 3 persistent SLBs are allocated here. The buffer will be zero
139 * initially, hence will all be invaild until we actually write them.
141 * If you make the number of persistent SLB entries dynamic, please also
142 * update PR KVM to flush and restore them accordingly.
144 static struct slb_shadow * __init new_slb_shadow(int cpu, unsigned long limit)
146 struct slb_shadow *s;
148 if (cpu != boot_cpuid) {
150 * Boot CPU comes here before early_radix_enabled
151 * is parsed (e.g., for disable_radix). So allocate
152 * always and this will be fixed up in free_unused_pacas.
154 if (early_radix_enabled())
158 s = alloc_paca_data(sizeof(*s), L1_CACHE_BYTES, limit, cpu);
160 s->persistent = cpu_to_be32(SLB_NUM_BOLTED);
161 s->buffer_length = cpu_to_be32(sizeof(*s));
166 #endif /* CONFIG_PPC_BOOK3S_64 */
168 #ifdef CONFIG_PPC_PSERIES
170 * new_rtas_args() - Allocates rtas args
172 * @limit: Memory limit for this allocation
174 * Allocates a struct rtas_args and return it's pointer,
175 * if not in Hypervisor mode
177 * Return: Pointer to allocated rtas_args
178 * NULL if CPU in Hypervisor Mode
180 static struct rtas_args * __init new_rtas_args(int cpu, unsigned long limit)
182 limit = min_t(unsigned long, limit, RTAS_INSTANTIATE_MAX);
184 if (early_cpu_has_feature(CPU_FTR_HVMODE))
187 return alloc_paca_data(sizeof(struct rtas_args), L1_CACHE_BYTES,
190 #endif /* CONFIG_PPC_PSERIES */
192 /* The Paca is an array with one entry per processor. Each contains an
193 * lppaca, which contains the information shared between the
194 * hypervisor and Linux.
195 * On systems with hardware multi-threading, there are two threads
196 * per processor. The Paca array must contain an entry for each thread.
197 * The VPD Areas will give a max logical processors = 2 * max physical
198 * processors. The processor VPD array needs one entry per physical
199 * processor (not thread).
201 struct paca_struct **paca_ptrs __read_mostly;
202 EXPORT_SYMBOL(paca_ptrs);
204 void __init __nostackprotector initialise_paca(struct paca_struct *new_paca, int cpu)
206 #ifdef CONFIG_PPC_PSERIES
207 new_paca->lppaca_ptr = NULL;
209 #ifdef CONFIG_PPC_BOOK3E
210 new_paca->kernel_pgd = swapper_pg_dir;
212 new_paca->lock_token = 0x8000;
213 new_paca->paca_index = cpu;
214 new_paca->kernel_toc = kernel_toc_addr();
215 new_paca->kernelbase = (unsigned long) _stext;
216 /* Only set MSR:IR/DR when MMU is initialized */
217 new_paca->kernel_msr = MSR_KERNEL & ~(MSR_IR | MSR_DR);
218 new_paca->hw_cpu_id = 0xffff;
219 new_paca->kexec_state = KEXEC_STATE_NONE;
220 new_paca->__current = &init_task;
221 new_paca->data_offset = 0xfeeeeeeeeeeeeeeeULL;
222 #ifdef CONFIG_PPC_BOOK3S_64
223 new_paca->slb_shadow_ptr = NULL;
226 #ifdef CONFIG_PPC_BOOK3E
227 /* For now -- if we have threads this will be adjusted later */
228 new_paca->tcd_ptr = &new_paca->tcd;
231 #ifdef CONFIG_PPC_PSERIES
232 new_paca->rtas_args_reentrant = NULL;
236 /* Put the paca pointer into r13 and SPRG_PACA */
237 void __nostackprotector setup_paca(struct paca_struct *new_paca)
240 local_paca = new_paca;
242 #ifdef CONFIG_PPC_BOOK3E
243 /* On Book3E, initialize the TLB miss exception frames */
244 mtspr(SPRN_SPRG_TLB_EXFRAME, local_paca->extlb);
247 * In HV mode, we setup both HPACA and PACA to avoid problems
248 * if we do a GET_PACA() before the feature fixups have been
251 * Normally you should test against CPU_FTR_HVMODE, but CPU features
252 * are not yet set up when we first reach here.
254 if (mfmsr() & MSR_HV)
255 mtspr(SPRN_SPRG_HPACA, local_paca);
257 mtspr(SPRN_SPRG_PACA, local_paca);
261 static int __initdata paca_nr_cpu_ids;
262 static int __initdata paca_ptrs_size;
263 static int __initdata paca_struct_size;
265 void __init allocate_paca_ptrs(void)
267 paca_nr_cpu_ids = nr_cpu_ids;
269 paca_ptrs_size = sizeof(struct paca_struct *) * nr_cpu_ids;
270 paca_ptrs = memblock_alloc_raw(paca_ptrs_size, SMP_CACHE_BYTES);
272 panic("Failed to allocate %d bytes for paca pointers\n",
275 memset(paca_ptrs, 0x88, paca_ptrs_size);
278 void __init allocate_paca(int cpu)
281 struct paca_struct *paca;
283 BUG_ON(cpu >= paca_nr_cpu_ids);
285 #ifdef CONFIG_PPC_BOOK3S_64
287 * We access pacas in real mode, and cannot take SLB faults
288 * on them when in virtual mode, so allocate them accordingly.
290 limit = min(ppc64_bolted_size(), ppc64_rma_size);
292 limit = ppc64_rma_size;
295 paca = alloc_paca_data(sizeof(struct paca_struct), L1_CACHE_BYTES,
297 paca_ptrs[cpu] = paca;
299 initialise_paca(paca, cpu);
300 #ifdef CONFIG_PPC_PSERIES
301 paca->lppaca_ptr = new_lppaca(cpu, limit);
303 #ifdef CONFIG_PPC_BOOK3S_64
304 paca->slb_shadow_ptr = new_slb_shadow(cpu, limit);
306 #ifdef CONFIG_PPC_PSERIES
307 paca->rtas_args_reentrant = new_rtas_args(cpu, limit);
309 paca_struct_size += sizeof(struct paca_struct);
312 void __init free_unused_pacas(void)
316 new_ptrs_size = sizeof(struct paca_struct *) * nr_cpu_ids;
317 if (new_ptrs_size < paca_ptrs_size)
318 memblock_free(__pa(paca_ptrs) + new_ptrs_size,
319 paca_ptrs_size - new_ptrs_size);
321 paca_nr_cpu_ids = nr_cpu_ids;
322 paca_ptrs_size = new_ptrs_size;
324 #ifdef CONFIG_PPC_BOOK3S_64
325 if (early_radix_enabled()) {
326 /* Ugly fixup, see new_slb_shadow() */
327 memblock_free(__pa(paca_ptrs[boot_cpuid]->slb_shadow_ptr),
328 sizeof(struct slb_shadow));
329 paca_ptrs[boot_cpuid]->slb_shadow_ptr = NULL;
333 printk(KERN_DEBUG "Allocated %u bytes for %u pacas\n",
334 paca_ptrs_size + paca_struct_size, nr_cpu_ids);
337 void copy_mm_to_paca(struct mm_struct *mm)
339 #ifdef CONFIG_PPC_BOOK3S
340 mm_context_t *context = &mm->context;
342 get_paca()->mm_ctx_id = context->id;
343 #ifdef CONFIG_PPC_MM_SLICES
344 VM_BUG_ON(!mm_ctx_slb_addr_limit(context));
345 get_paca()->mm_ctx_slb_addr_limit = mm_ctx_slb_addr_limit(context);
346 memcpy(&get_paca()->mm_ctx_low_slices_psize, mm_ctx_low_slices(context),
348 memcpy(&get_paca()->mm_ctx_high_slices_psize, mm_ctx_high_slices(context),
349 TASK_SLICE_ARRAY_SZ(context));
350 #else /* CONFIG_PPC_MM_SLICES */
351 get_paca()->mm_ctx_user_psize = context->user_psize;
352 get_paca()->mm_ctx_sllp = context->sllp;
354 #else /* !CONFIG_PPC_BOOK3S */