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Linux/arch/powerpc/kernel/paca.c

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  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 
 10 #include <linux/smp.h>
 11 #include <linux/export.h>
 12 #include <linux/memblock.h>
 13 
 14 #include <asm/lppaca.h>
 15 #include <asm/paca.h>
 16 #include <asm/sections.h>
 17 #include <asm/pgtable.h>
 18 #include <asm/kexec.h>
 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 
 24 #ifdef CONFIG_PPC_BOOK3S
 25 
 26 /*
 27  * The structure which the hypervisor knows about - this structure
 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
 30  * boundary.  The lppaca is also used on POWER5 pSeries boxes.
 31  * The lppaca is 640 bytes long, and cannot readily
 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.
 34  */
 35 struct lppaca lppaca[] = {
 36         [0 ... (NR_LPPACAS-1)] = {
 37                 .desc = cpu_to_be32(0xd397d781),        /* "LpPa" */
 38                 .size = cpu_to_be16(sizeof(struct lppaca)),
 39                 .fpregs_in_use = 1,
 40                 .slb_count = cpu_to_be16(64),
 41                 .vmxregs_in_use = 0,
 42                 .page_ins = 0,
 43         },
 44 };
 45 
 46 static struct lppaca *extra_lppacas;
 47 static long __initdata lppaca_size;
 48 
 49 static void __init 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 * __init 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 __init 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 
 91 static inline void allocate_lppacas(int nr_cpus, unsigned long limit) { }
 92 static inline void free_lppacas(void) { }
 93 
 94 #endif /* CONFIG_PPC_BOOK3S */
 95 
 96 #ifdef CONFIG_PPC_STD_MMU_64
 97 
 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  * If you make the number of persistent SLB entries dynamic, please also
103  * update PR KVM to flush and restore them accordingly.
104  */
105 static struct slb_shadow *slb_shadow;
106 
107 static void __init allocate_slb_shadows(int nr_cpus, int limit)
108 {
109         int size = PAGE_ALIGN(sizeof(struct slb_shadow) * nr_cpus);
110         slb_shadow = __va(memblock_alloc_base(size, PAGE_SIZE, limit));
111         memset(slb_shadow, 0, size);
112 }
113 
114 static struct slb_shadow * __init init_slb_shadow(int cpu)
115 {
116         struct slb_shadow *s = &slb_shadow[cpu];
117 
118         /*
119          * When we come through here to initialise boot_paca, the slb_shadow
120          * buffers are not allocated yet. That's OK, we'll get one later in
121          * boot, but make sure we don't corrupt memory at 0.
122          */
123         if (!slb_shadow)
124                 return NULL;
125 
126         s->persistent = cpu_to_be32(SLB_NUM_BOLTED);
127         s->buffer_length = cpu_to_be32(sizeof(*s));
128 
129         return s;
130 }
131 
132 #else /* CONFIG_PPC_STD_MMU_64 */
133 
134 static void __init allocate_slb_shadows(int nr_cpus, int limit) { }
135 
136 #endif /* CONFIG_PPC_STD_MMU_64 */
137 
138 /* The Paca is an array with one entry per processor.  Each contains an
139  * lppaca, which contains the information shared between the
140  * hypervisor and Linux.
141  * On systems with hardware multi-threading, there are two threads
142  * per processor.  The Paca array must contain an entry for each thread.
143  * The VPD Areas will give a max logical processors = 2 * max physical
144  * processors.  The processor VPD array needs one entry per physical
145  * processor (not thread).
146  */
147 struct paca_struct *paca;
148 EXPORT_SYMBOL(paca);
149 
150 void __init initialise_paca(struct paca_struct *new_paca, int cpu)
151 {
152        /* The TOC register (GPR2) points 32kB into the TOC, so that 64kB
153         * of the TOC can be addressed using a single machine instruction.
154         */
155         unsigned long kernel_toc = (unsigned long)(&__toc_start) + 0x8000UL;
156 
157 #ifdef CONFIG_PPC_BOOK3S
158         new_paca->lppaca_ptr = new_lppaca(cpu);
159 #else
160         new_paca->kernel_pgd = swapper_pg_dir;
161 #endif
162         new_paca->lock_token = 0x8000;
163         new_paca->paca_index = cpu;
164         new_paca->kernel_toc = kernel_toc;
165         new_paca->kernelbase = (unsigned long) _stext;
166         /* Only set MSR:IR/DR when MMU is initialized */
167         new_paca->kernel_msr = MSR_KERNEL & ~(MSR_IR | MSR_DR);
168         new_paca->hw_cpu_id = 0xffff;
169         new_paca->kexec_state = KEXEC_STATE_NONE;
170         new_paca->__current = &init_task;
171         new_paca->data_offset = 0xfeeeeeeeeeeeeeeeULL;
172 #ifdef CONFIG_PPC_STD_MMU_64
173         new_paca->slb_shadow_ptr = init_slb_shadow(cpu);
174 #endif /* CONFIG_PPC_STD_MMU_64 */
175 
176 #ifdef CONFIG_PPC_BOOK3E
177         /* For now -- if we have threads this will be adjusted later */
178         new_paca->tcd_ptr = &new_paca->tcd;
179 #endif
180 }
181 
182 /* Put the paca pointer into r13 and SPRG_PACA */
183 void setup_paca(struct paca_struct *new_paca)
184 {
185         /* Setup r13 */
186         local_paca = new_paca;
187 
188 #ifdef CONFIG_PPC_BOOK3E
189         /* On Book3E, initialize the TLB miss exception frames */
190         mtspr(SPRN_SPRG_TLB_EXFRAME, local_paca->extlb);
191 #else
192         /* In HV mode, we setup both HPACA and PACA to avoid problems
193          * if we do a GET_PACA() before the feature fixups have been
194          * applied
195          */
196         if (cpu_has_feature(CPU_FTR_HVMODE))
197                 mtspr(SPRN_SPRG_HPACA, local_paca);
198 #endif
199         mtspr(SPRN_SPRG_PACA, local_paca);
200 
201 }
202 
203 static int __initdata paca_size;
204 
205 void __init allocate_pacas(void)
206 {
207         u64 limit;
208         int cpu;
209 
210         limit = ppc64_rma_size;
211 
212 #ifdef CONFIG_PPC_BOOK3S_64
213         /*
214          * We can't take SLB misses on the paca, and we want to access them
215          * in real mode, so allocate them within the RMA and also within
216          * the first segment.
217          */
218         limit = min(0x10000000ULL, limit);
219 #endif
220 
221         paca_size = PAGE_ALIGN(sizeof(struct paca_struct) * nr_cpu_ids);
222 
223         paca = __va(memblock_alloc_base(paca_size, PAGE_SIZE, limit));
224         memset(paca, 0, paca_size);
225 
226         printk(KERN_DEBUG "Allocated %u bytes for %d pacas at %p\n",
227                 paca_size, nr_cpu_ids, paca);
228 
229         allocate_lppacas(nr_cpu_ids, limit);
230 
231         allocate_slb_shadows(nr_cpu_ids, limit);
232 
233         /* Can't use for_each_*_cpu, as they aren't functional yet */
234         for (cpu = 0; cpu < nr_cpu_ids; cpu++)
235                 initialise_paca(&paca[cpu], cpu);
236 }
237 
238 void __init free_unused_pacas(void)
239 {
240         int new_size;
241 
242         new_size = PAGE_ALIGN(sizeof(struct paca_struct) * nr_cpu_ids);
243 
244         if (new_size >= paca_size)
245                 return;
246 
247         memblock_free(__pa(paca) + new_size, paca_size - new_size);
248 
249         printk(KERN_DEBUG "Freed %u bytes for unused pacas\n",
250                 paca_size - new_size);
251 
252         paca_size = new_size;
253 
254         free_lppacas();
255 }
256 

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