Release 4.14 arch/powerpc/kernel/paca.c
/*
* 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>
#include <asm/sections.h>
#include <asm/pgtable.h>
#include <asm/kexec.h>
#ifdef CONFIG_PPC_BOOK3S
/*
* The structure which the hypervisor knows about - this structure
* should not cross a page boundary. The vpa_init/register_vpa call
* is now known to fail if the lppaca structure crosses a page
* boundary. The lppaca is also used on POWER5 pSeries boxes.
* The lppaca is 640 bytes long, and cannot readily
* change since the hypervisor knows its layout, so a 1kB alignment
* will suffice to ensure that it doesn't cross a page boundary.
*/
struct lppaca lppaca[] = {
[0 ... (NR_LPPACAS-1)] = {
.desc = cpu_to_be32(0xd397d781), /* "LpPa" */
.size = cpu_to_be16(sizeof(struct lppaca)),
.fpregs_in_use = 1,
.slb_count = cpu_to_be16(64),
.vmxregs_in_use = 0,
.page_ins = 0,
},
};
static struct lppaca *extra_lppacas;
static long __initdata lppaca_size;
static void __init allocate_lppacas(int nr_cpus, unsigned long limit)
{
if (nr_cpus <= NR_LPPACAS)
return;
lppaca_size = PAGE_ALIGN(sizeof(struct lppaca) *
(nr_cpus - NR_LPPACAS));
extra_lppacas = __va(memblock_alloc_base(lppaca_size,
PAGE_SIZE, limit));
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Paul Mackerras | 51 | 98.08% | 1 | 50.00% |
| Vladimir Murzin | 1 | 1.92% | 1 | 50.00% |
| Total | 52 | 100.00% | 2 | 100.00% |
static struct lppaca * __init new_lppaca(int cpu)
{
struct lppaca *lp;
if (cpu < NR_LPPACAS)
return &lppaca[cpu];
lp = extra_lppacas + (cpu - NR_LPPACAS);
*lp = lppaca[0];
return lp;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Paul Mackerras | 50 | 98.04% | 1 | 50.00% |
| Vladimir Murzin | 1 | 1.96% | 1 | 50.00% |
| Total | 51 | 100.00% | 2 | 100.00% |
static void __init free_lppacas(void)
{
long new_size = 0, nr;
if (!lppaca_size)
return;
nr = num_possible_cpus() - NR_LPPACAS;
if (nr > 0)
new_size = PAGE_ALIGN(nr * sizeof(struct lppaca));
if (new_size >= lppaca_size)
return;
memblock_free(__pa(extra_lppacas) + new_size, lppaca_size - new_size);
lppaca_size = new_size;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Paul Mackerras | 72 | 98.63% | 1 | 50.00% |
| Vladimir Murzin | 1 | 1.37% | 1 | 50.00% |
| Total | 73 | 100.00% | 2 | 100.00% |
#else
static inline void allocate_lppacas(int nr_cpus, unsigned long limit) { }
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Paul Mackerras | 11 | 84.62% | 1 | 50.00% |
| Kumar Gala | 2 | 15.38% | 1 | 50.00% |
| Total | 13 | 100.00% | 2 | 100.00% |
static inline void free_lppacas(void) { }
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| Person | Tokens | Prop | Commits | CommitProp |
| Paul Mackerras | 8 | 100.00% | 1 | 100.00% |
| Total | 8 | 100.00% | 1 | 100.00% |
#endif /* CONFIG_PPC_BOOK3S */
#ifdef CONFIG_PPC_STD_MMU_64
/*
* 3 persistent SLBs are registered 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 * __initdata slb_shadow;
static void __init allocate_slb_shadows(int nr_cpus, int limit)
{
int size = PAGE_ALIGN(sizeof(struct slb_shadow) * nr_cpus);
if (early_radix_enabled())
return;
slb_shadow = __va(memblock_alloc_base(size, PAGE_SIZE, limit));
memset(slb_shadow, 0, size);
}
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| Person | Tokens | Prop | Commits | CommitProp |
| Jeremy Kerr | 49 | 87.50% | 1 | 33.33% |
| Nicholas Piggin | 6 | 10.71% | 1 | 33.33% |
| Michael Neuling | 1 | 1.79% | 1 | 33.33% |
| Total | 56 | 100.00% | 3 | 100.00% |
static struct slb_shadow * __init init_slb_shadow(int cpu)
{
struct slb_shadow *s;
if (early_radix_enabled())
return NULL;
s = &slb_shadow[cpu];
/*
* When we come through here to initialise boot_paca, the slb_shadow
* buffers are not allocated yet. That's OK, we'll get one later in
* boot, but make sure we don't corrupt memory at 0.
*/
if (!slb_shadow)
return NULL;
s->persistent = cpu_to_be32(SLB_NUM_BOLTED);
s->buffer_length = cpu_to_be32(sizeof(*s));
return s;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Jeremy Kerr | 29 | 43.28% | 1 | 20.00% |
| Nicholas Piggin | 12 | 17.91% | 1 | 20.00% |
| Michael Neuling | 11 | 16.42% | 1 | 20.00% |
| Gavin Shan | 9 | 13.43% | 1 | 20.00% |
| Anton Blanchard | 6 | 8.96% | 1 | 20.00% |
| Total | 67 | 100.00% | 5 | 100.00% |
#else /* CONFIG_PPC_STD_MMU_64 */
static void __init allocate_slb_shadows(int nr_cpus, int limit) { }
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Jeremy Kerr | 12 | 100.00% | 1 | 100.00% |
| Total | 12 | 100.00% | 1 | 100.00% |
#endif /* CONFIG_PPC_STD_MMU_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;
EXPORT_SYMBOL(paca);
void __init initialise_paca(struct paca_struct *new_paca, int cpu)
{
#ifdef CONFIG_PPC_BOOK3S
new_paca->lppaca_ptr = new_lppaca(cpu);
#else
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_STD_MMU_64
new_paca->slb_shadow_ptr = init_slb_shadow(cpu);
#endif /* CONFIG_PPC_STD_MMU_64 */
#ifdef CONFIG_PPC_BOOK3E
/* For now -- if we have threads this will be adjusted later */
new_paca->tcd_ptr = &new_paca->tcd;
#endif
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Tony Breeds | 44 | 32.84% | 1 | 7.69% |
| Benjamin Herrenschmidt | 31 | 23.13% | 3 | 23.08% |
| Paul Mackerras | 19 | 14.18% | 3 | 23.08% |
| Michael Ellerman | 16 | 11.94% | 3 | 23.08% |
| Scott Wood | 15 | 11.19% | 1 | 7.69% |
| Michael Neuling | 6 | 4.48% | 1 | 7.69% |
| Jeremy Kerr | 3 | 2.24% | 1 | 7.69% |
| Total | 134 | 100.00% | 13 | 100.00% |
/* 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);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Matt Evans | 28 | 51.85% | 1 | 25.00% |
| Benjamin Herrenschmidt | 24 | 44.44% | 1 | 25.00% |
| Paul Mackerras | 1 | 1.85% | 1 | 25.00% |
| Aneesh Kumar K.V | 1 | 1.85% | 1 | 25.00% |
| Total | 54 | 100.00% | 4 | 100.00% |
static int __initdata paca_size;
void __init allocate_pacas(void)
{
u64 limit;
int cpu;
limit = ppc64_rma_size;
#ifdef CONFIG_PPC_BOOK3S_64
/*
* We can't take SLB misses on the paca, and we want to access them
* in real mode, so allocate them within the RMA and also within
* the first segment.
*/
limit = min(0x10000000ULL, limit);
#endif
paca_size = PAGE_ALIGN(sizeof(struct paca_struct) * nr_cpu_ids);
paca = __va(memblock_alloc_base(paca_size, PAGE_SIZE, limit));
memset(paca, 0, paca_size);
printk(KERN_DEBUG "Allocated %u bytes for %u pacas at %p\n",
paca_size, nr_cpu_ids, paca);
allocate_lppacas(nr_cpu_ids, limit);
allocate_slb_shadows(nr_cpu_ids, limit);
/* Can't use for_each_*_cpu, as they aren't functional yet */
for (cpu = 0; cpu < nr_cpu_ids; cpu++)
initialise_paca(&paca[cpu], cpu);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Michael Ellerman | 87 | 72.50% | 1 | 12.50% |
| Scott Wood | 13 | 10.83% | 1 | 12.50% |
| Jeremy Kerr | 7 | 5.83% | 1 | 12.50% |
| Paul Mackerras | 6 | 5.00% | 1 | 12.50% |
| Milton D. Miller II | 4 | 3.33% | 1 | 12.50% |
| Yinghai Lu | 1 | 0.83% | 1 | 12.50% |
| Alexey Dobriyan | 1 | 0.83% | 1 | 12.50% |
| Stephen Rothwell | 1 | 0.83% | 1 | 12.50% |
| Total | 120 | 100.00% | 8 | 100.00% |
void __init free_unused_pacas(void)
{
int new_size;
new_size = PAGE_ALIGN(sizeof(struct paca_struct) * nr_cpu_ids);
if (new_size >= paca_size)
return;
memblock_free(__pa(paca) + new_size, paca_size - new_size);
printk(KERN_DEBUG "Freed %u bytes for unused pacas\n",
paca_size - new_size);
paca_size = new_size;
free_lppacas();
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Michael Ellerman | 56 | 90.32% | 1 | 20.00% |
| Paul Mackerras | 3 | 4.84% | 1 | 20.00% |
| Tony Breeds | 1 | 1.61% | 1 | 20.00% |
| Ryan Grimm | 1 | 1.61% | 1 | 20.00% |
| Yinghai Lu | 1 | 1.61% | 1 | 20.00% |
| Total | 62 | 100.00% | 5 | 100.00% |
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.addr_limit);
get_paca()->addr_limit = mm->context.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
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Aneesh Kumar K.V | 112 | 100.00% | 3 | 100.00% |
| Total | 112 | 100.00% | 3 | 100.00% |
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Paul Mackerras | 238 | 24.82% | 4 | 9.09% |
| Michael Ellerman | 169 | 17.62% | 3 | 6.82% |
| Aneesh Kumar K.V | 113 | 11.78% | 4 | 9.09% |
| Jeremy Kerr | 106 | 11.05% | 2 | 4.55% |
| Benjamin Herrenschmidt | 70 | 7.30% | 4 | 9.09% |
| David Gibson | 49 | 5.11% | 2 | 4.55% |
| Tony Breeds | 45 | 4.69% | 1 | 2.27% |
| Matt Evans | 29 | 3.02% | 1 | 2.27% |
| Scott Wood | 28 | 2.92% | 2 | 4.55% |
| Anton Blanchard | 27 | 2.82% | 3 | 6.82% |
| Michael Neuling | 22 | 2.29% | 2 | 4.55% |
| Nicholas Piggin | 19 | 1.98% | 1 | 2.27% |
| Stephen Rothwell | 10 | 1.04% | 4 | 9.09% |
| Gavin Shan | 9 | 0.94% | 1 | 2.27% |
| Milton D. Miller II | 5 | 0.52% | 1 | 2.27% |
| Brian King | 5 | 0.52% | 1 | 2.27% |
| Ingo Molnar | 3 | 0.31% | 1 | 2.27% |
| Yinghai Lu | 3 | 0.31% | 1 | 2.27% |
| Vladimir Murzin | 3 | 0.31% | 1 | 2.27% |
| Kumar Gala | 2 | 0.21% | 1 | 2.27% |
| Alexander Graf | 1 | 0.10% | 1 | 2.27% |
| Ryan Grimm | 1 | 0.10% | 1 | 2.27% |
| Alexey Dobriyan | 1 | 0.10% | 1 | 2.27% |
| Paul Gortmaker | 1 | 0.10% | 1 | 2.27% |
| Total | 959 | 100.00% | 44 | 100.00% |
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