linux/arch/powerpc/kernel/paca.c

283 lines
7.3 KiB
C
Raw Normal View History

/*
* c 2001 PPC 64 Team, IBM Corp
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/smp.h>
#include <linux/export.h>
#include <linux/memblock.h>
#include <linux/sched/task.h>
#include <asm/lppaca.h>
#include <asm/paca.h>
2008-08-30 01:43:47 +00:00
#include <asm/sections.h>
#include <asm/pgtable.h>
#include <asm/kexec.h>
#include "setup.h"
#ifdef CONFIG_PPC_PSERIES
/*
* See asm/lppaca.h for more detail.
*
* lppaca structures must must be 1kB in size, L1 cache line aligned,
* and not cross 4kB boundary. A 1kB size and 1kB alignment will satisfy
* these requirements.
*/
static inline void init_lppaca(struct lppaca *lppaca)
{
BUILD_BUG_ON(sizeof(struct lppaca) != 640);
*lppaca = (struct lppaca) {
.desc = cpu_to_be32(0xd397d781), /* "LpPa" */
.size = cpu_to_be16(0x400),
.fpregs_in_use = 1,
.slb_count = cpu_to_be16(64),
.vmxregs_in_use = 0,
.page_ins = 0, };
};
static struct lppaca * __init new_lppaca(int cpu, unsigned long limit)
{
struct lppaca *lp;
size_t size = 0x400;
BUILD_BUG_ON(size < sizeof(struct lppaca));
if (early_cpu_has_feature(CPU_FTR_HVMODE))
return NULL;
lp = __va(memblock_alloc_base(size, 0x400, limit));
init_lppaca(lp);
return lp;
}
static void __init free_lppaca(struct lppaca *lp)
{
size_t size = 0x400;
if (early_cpu_has_feature(CPU_FTR_HVMODE))
return;
memblock_free(__pa(lp), size);
}
#endif /* CONFIG_PPC_BOOK3S */
#ifdef CONFIG_PPC_BOOK3S_64
/*
* 3 persistent SLBs are allocated here. The buffer will be zero
* initially, hence will all be invaild until we actually write them.
*
* If you make the number of persistent SLB entries dynamic, please also
* update PR KVM to flush and restore them accordingly.
*/
static struct slb_shadow * __init new_slb_shadow(int cpu, unsigned long limit)
{
struct slb_shadow *s;
if (cpu != boot_cpuid) {
/*
* Boot CPU comes here before early_radix_enabled
* is parsed (e.g., for disable_radix). So allocate
* always and this will be fixed up in free_unused_pacas.
*/
if (early_radix_enabled())
return NULL;
}
s = __va(memblock_alloc_base(sizeof(*s), L1_CACHE_BYTES, limit));
memset(s, 0, sizeof(*s));
s->persistent = cpu_to_be32(SLB_NUM_BOLTED);
s->buffer_length = cpu_to_be32(sizeof(*s));
return s;
}
#endif /* CONFIG_PPC_BOOK3S_64 */
/* The Paca is an array with one entry per processor. Each contains an
* lppaca, which contains the information shared between the
* hypervisor and Linux.
* On systems with hardware multi-threading, there are two threads
* per processor. The Paca array must contain an entry for each thread.
* The VPD Areas will give a max logical processors = 2 * max physical
* processors. The processor VPD array needs one entry per physical
* processor (not thread).
*/
struct paca_struct **paca_ptrs __read_mostly;
EXPORT_SYMBOL(paca_ptrs);
void __init initialise_paca(struct paca_struct *new_paca, int cpu)
{
#ifdef CONFIG_PPC_PSERIES
new_paca->lppaca_ptr = NULL;
#endif
#ifdef CONFIG_PPC_BOOK3E
new_paca->kernel_pgd = swapper_pg_dir;
#endif
new_paca->lock_token = 0x8000;
new_paca->paca_index = cpu;
new_paca->kernel_toc = kernel_toc_addr();
new_paca->kernelbase = (unsigned long) _stext;
/* Only set MSR:IR/DR when MMU is initialized */
new_paca->kernel_msr = MSR_KERNEL & ~(MSR_IR | MSR_DR);
new_paca->hw_cpu_id = 0xffff;
new_paca->kexec_state = KEXEC_STATE_NONE;
new_paca->__current = &init_task;
new_paca->data_offset = 0xfeeeeeeeeeeeeeeeULL;
#ifdef CONFIG_PPC_BOOK3S_64
new_paca->slb_shadow_ptr = NULL;
#endif
#ifdef CONFIG_PPC_BOOK3E
/* For now -- if we have threads this will be adjusted later */
new_paca->tcd_ptr = &new_paca->tcd;
#endif
}
/* Put the paca pointer into r13 and SPRG_PACA */
void setup_paca(struct paca_struct *new_paca)
{
/* Setup r13 */
local_paca = new_paca;
#ifdef CONFIG_PPC_BOOK3E
/* On Book3E, initialize the TLB miss exception frames */
mtspr(SPRN_SPRG_TLB_EXFRAME, local_paca->extlb);
#else
/* In HV mode, we setup both HPACA and PACA to avoid problems
* if we do a GET_PACA() before the feature fixups have been
* applied
*/
if (early_cpu_has_feature(CPU_FTR_HVMODE))
mtspr(SPRN_SPRG_HPACA, local_paca);
#endif
mtspr(SPRN_SPRG_PACA, local_paca);
}
static int __initdata paca_nr_cpu_ids;
static int __initdata paca_ptrs_size;
void __init allocate_pacas(void)
{
u64 limit;
unsigned long size = 0;
int cpu;
#ifdef CONFIG_PPC_BOOK3S_64
/*
* We access pacas in real mode, and cannot take SLB faults
* on them when in virtual mode, so allocate them accordingly.
*/
limit = min(ppc64_bolted_size(), ppc64_rma_size);
#else
limit = ppc64_rma_size;
#endif
paca_nr_cpu_ids = nr_cpu_ids;
paca_ptrs_size = sizeof(struct paca_struct *) * nr_cpu_ids;
paca_ptrs = __va(memblock_alloc_base(paca_ptrs_size, 0, limit));
memset(paca_ptrs, 0, paca_ptrs_size);
size += paca_ptrs_size;
for (cpu = 0; cpu < nr_cpu_ids; cpu++) {
unsigned long pa;
pa = memblock_alloc_base(sizeof(struct paca_struct),
L1_CACHE_BYTES, limit);
paca_ptrs[cpu] = __va(pa);
memset(paca_ptrs[cpu], 0, sizeof(struct paca_struct));
size += sizeof(struct paca_struct);
}
printk(KERN_DEBUG "Allocated %lu bytes for %u pacas\n",
size, nr_cpu_ids);
/* Can't use for_each_*_cpu, as they aren't functional yet */
for (cpu = 0; cpu < nr_cpu_ids; cpu++) {
struct paca_struct *paca = paca_ptrs[cpu];
initialise_paca(paca, cpu);
#ifdef CONFIG_PPC_PSERIES
paca->lppaca_ptr = new_lppaca(cpu, limit);
#endif
#ifdef CONFIG_PPC_BOOK3S_64
paca->slb_shadow_ptr = new_slb_shadow(cpu, limit);
#endif
}
}
void __init free_unused_pacas(void)
{
unsigned long size = 0;
int new_ptrs_size;
int cpu;
for (cpu = 0; cpu < paca_nr_cpu_ids; cpu++) {
if (!cpu_possible(cpu)) {
unsigned long pa = __pa(paca_ptrs[cpu]);
#ifdef CONFIG_PPC_PSERIES
free_lppaca(paca_ptrs[cpu]->lppaca_ptr);
#endif
memblock_free(pa, sizeof(struct paca_struct));
paca_ptrs[cpu] = NULL;
size += sizeof(struct paca_struct);
}
}
new_ptrs_size = sizeof(struct paca_struct *) * nr_cpu_ids;
if (new_ptrs_size < paca_ptrs_size) {
memblock_free(__pa(paca_ptrs) + new_ptrs_size,
paca_ptrs_size - new_ptrs_size);
size += paca_ptrs_size - new_ptrs_size;
}
if (size)
printk(KERN_DEBUG "Freed %lu bytes for unused pacas\n", size);
paca_nr_cpu_ids = nr_cpu_ids;
paca_ptrs_size = new_ptrs_size;
#ifdef CONFIG_PPC_BOOK3S_64
if (early_radix_enabled()) {
/* Ugly fixup, see new_slb_shadow() */
memblock_free(__pa(paca_ptrs[boot_cpuid]->slb_shadow_ptr),
sizeof(struct slb_shadow));
paca_ptrs[boot_cpuid]->slb_shadow_ptr = NULL;
}
#endif
}
void copy_mm_to_paca(struct mm_struct *mm)
{
#ifdef CONFIG_PPC_BOOK3S
mm_context_t *context = &mm->context;
get_paca()->mm_ctx_id = context->id;
#ifdef CONFIG_PPC_MM_SLICES
VM_BUG_ON(!mm->context.slb_addr_limit);
get_paca()->mm_ctx_slb_addr_limit = mm->context.slb_addr_limit;
get_paca()->mm_ctx_low_slices_psize = context->low_slices_psize;
memcpy(&get_paca()->mm_ctx_high_slices_psize,
&context->high_slices_psize, TASK_SLICE_ARRAY_SZ(mm));
#else /* CONFIG_PPC_MM_SLICES */
get_paca()->mm_ctx_user_psize = context->user_psize;
get_paca()->mm_ctx_sllp = context->sllp;
#endif
#else /* !CONFIG_PPC_BOOK3S */
return;
#endif
}