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powerpc/64s: Allocate slb_shadow structures individually

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slb_shadow structures are avoided for radix environment.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Nicholas Piggin 2018-02-14 01:08:14 +10:00 committed by Michael Ellerman
parent 499dcd4137
commit 384e806784
1 changed files with 30 additions and 35 deletions
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65
arch/powerpc/kernel/paca.c
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@ -72,41 +72,28 @@ static void __init free_lppaca(struct lppaca *lp)
#ifdef CONFIG_PPC_BOOK3S_64
/*
* 3 persistent SLBs are registered here. The buffer will be zero
* 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 * __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);
}
static struct slb_shadow * __init init_slb_shadow(int cpu)
static struct slb_shadow * __init new_slb_shadow(int cpu, unsigned long limit)
{
struct slb_shadow *s;
if (early_radix_enabled())
return NULL;
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 = &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 = __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));
@ -114,10 +101,6 @@ static struct slb_shadow * __init init_slb_shadow(int cpu)
return s;
}
#else /* !CONFIG_PPC_BOOK3S_64 */
static void __init allocate_slb_shadows(int nr_cpus, int limit) { }
#endif /* CONFIG_PPC_BOOK3S_64 */
/* The Paca is an array with one entry per processor. Each contains an
@ -151,7 +134,7 @@ void __init initialise_paca(struct paca_struct *new_paca, int cpu)
new_paca->__current = &init_task;
new_paca->data_offset = 0xfeeeeeeeeeeeeeeeULL;
#ifdef CONFIG_PPC_BOOK3S_64
new_paca->slb_shadow_ptr = init_slb_shadow(cpu);
new_paca->slb_shadow_ptr = NULL;
#endif
#ifdef CONFIG_PPC_BOOK3E
@ -222,13 +205,16 @@ void __init allocate_pacas(void)
printk(KERN_DEBUG "Allocated %lu bytes for %u pacas\n",
size, nr_cpu_ids);
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_ptrs[cpu], cpu);
struct paca_struct *paca = paca_ptrs[cpu];
initialise_paca(paca, cpu);
#ifdef CONFIG_PPC_PSERIES
paca_ptrs[cpu]->lppaca_ptr = new_lppaca(cpu, limit);
paca->lppaca_ptr = new_lppaca(cpu, limit);
#endif
#ifdef CONFIG_PPC_BOOK3S_64
paca->slb_shadow_ptr = new_slb_shadow(cpu, limit);
#endif
}
}
@ -263,6 +249,15 @@ void __init free_unused_pacas(void)
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)