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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 struct slb_shadow slb_shadow[] __cacheline_aligned = {
103         [0 ... (NR_CPUS-1)] = {
104                 .persistent = cpu_to_be32(SLB_NUM_BOLTED),
105                 .buffer_length = cpu_to_be32(sizeof(struct slb_shadow)),
106         },
107 };
108 
109 #endif /* CONFIG_PPC_STD_MMU_64 */
110 
111 /* The Paca is an array with one entry per processor.  Each contains an
112  * lppaca, which contains the information shared between the
113  * hypervisor and Linux.
114  * 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  */
120 struct paca_struct *paca;
121 EXPORT_SYMBOL(paca);
122 
123 void __init initialise_paca(struct paca_struct *new_paca, int cpu)
124 {
125        /* The TOC register (GPR2) points 32kB into the TOC, so that 64kB
126         * of the TOC can be addressed using a single machine instruction.
127         */
128         unsigned long kernel_toc = (unsigned long)(&__toc_start) + 0x8000UL;
129 
130 #ifdef CONFIG_PPC_BOOK3S
131         new_paca->lppaca_ptr = new_lppaca(cpu);
132 #else
133         new_paca->kernel_pgd = swapper_pg_dir;
134 #endif
135         new_paca->lock_token = 0x8000;
136         new_paca->paca_index = cpu;
137         new_paca->kernel_toc = kernel_toc;
138         new_paca->kernelbase = (unsigned long) _stext;
139         new_paca->kernel_msr = MSR_KERNEL;
140         new_paca->hw_cpu_id = 0xffff;
141         new_paca->kexec_state = KEXEC_STATE_NONE;
142         new_paca->__current = &init_task;
143         new_paca->data_offset = 0xfeeeeeeeeeeeeeeeULL;
144 #ifdef CONFIG_PPC_STD_MMU_64
145         new_paca->slb_shadow_ptr = &slb_shadow[cpu];
146 #endif /* CONFIG_PPC_STD_MMU_64 */
147 }
148 
149 /* Put the paca pointer into r13 and SPRG_PACA */
150 void setup_paca(struct paca_struct *new_paca)
151 {
152         /* Setup r13 */
153         local_paca = new_paca;
154 
155 #ifdef CONFIG_PPC_BOOK3E
156         /* On Book3E, initialize the TLB miss exception frames */
157         mtspr(SPRN_SPRG_TLB_EXFRAME, local_paca->extlb);
158 #else
159         /* In HV mode, we setup both HPACA and PACA to avoid problems
160          * if we do a GET_PACA() before the feature fixups have been
161          * applied
162          */
163         if (cpu_has_feature(CPU_FTR_HVMODE))
164                 mtspr(SPRN_SPRG_HPACA, local_paca);
165 #endif
166         mtspr(SPRN_SPRG_PACA, local_paca);
167 
168 }
169 
170 static int __initdata paca_size;
171 
172 void __init allocate_pacas(void)
173 {
174         int cpu, limit;
175 
176         /*
177          * We can't take SLB misses on the paca, and we want to access them
178          * in real mode, so allocate them within the RMA and also within
179          * the first segment.
180          */
181         limit = min(0x10000000ULL, ppc64_rma_size);
182 
183         paca_size = PAGE_ALIGN(sizeof(struct paca_struct) * nr_cpu_ids);
184 
185         paca = __va(memblock_alloc_base(paca_size, PAGE_SIZE, limit));
186         memset(paca, 0, paca_size);
187 
188         printk(KERN_DEBUG "Allocated %u bytes for %d pacas at %p\n",
189                 paca_size, nr_cpu_ids, paca);
190 
191         allocate_lppacas(nr_cpu_ids, limit);
192 
193         /* Can't use for_each_*_cpu, as they aren't functional yet */
194         for (cpu = 0; cpu < nr_cpu_ids; cpu++)
195                 initialise_paca(&paca[cpu], cpu);
196 }
197 
198 void __init free_unused_pacas(void)
199 {
200         int new_size;
201 
202         new_size = PAGE_ALIGN(sizeof(struct paca_struct) * nr_cpu_ids);
203 
204         if (new_size >= paca_size)
205                 return;
206 
207         memblock_free(__pa(paca) + new_size, paca_size - new_size);
208 
209         printk(KERN_DEBUG "Freed %u bytes for unused pacas\n",
210                 paca_size - new_size);
211 
212         paca_size = new_size;
213 
214         free_lppacas();
215 }
216 

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