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MIPS: mm: Place per_cpu on different nodes, if NUMA is enabled

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Implement placing of per_cpu into memory, which is local to the CPU.

Signed-off-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
Signed-off-by: Paul Burton <paulburton@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: James Hogan <jhogan@kernel.org>
Cc: linux-mips@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
This commit is contained in:
Thomas Bogendoerfer 2020-01-09 13:23:31 +01:00 committed by Paul Burton
parent a14879e149
commit f3c560a61b
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GPG key ID: 3EA79FACB57500DD
2 changed files with 53 additions and 0 deletions
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8
arch/mips/Kconfig
View file

@ -2696,6 +2696,14 @@ config NUMA
config SYS_SUPPORTS_NUMA
bool
config HAVE_SETUP_PER_CPU_AREA
def_bool y
depends on NUMA
config NEED_PER_CPU_EMBED_FIRST_CHUNK
def_bool y
depends on NUMA
config RELOCATABLE
bool "Relocatable kernel"
depends on SYS_SUPPORTS_RELOCATABLE && (CPU_MIPS32_R2 || CPU_MIPS64_R2 || CPU_MIPS32_R6 || CPU_MIPS64_R6 || CAVIUM_OCTEON_SOC)

45
arch/mips/mm/init.c
View file

@ -508,6 +508,51 @@ void __ref free_initmem(void)
free_initmem_default(POISON_FREE_INITMEM);
}
#ifdef CONFIG_HAVE_SETUP_PER_CPU_AREA
unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
EXPORT_SYMBOL(__per_cpu_offset);
static int __init pcpu_cpu_distance(unsigned int from, unsigned int to)
{
return node_distance(cpu_to_node(from), cpu_to_node(to));
}
static void * __init pcpu_fc_alloc(unsigned int cpu, size_t size,
size_t align)
{
return memblock_alloc_try_nid(size, align, __pa(MAX_DMA_ADDRESS),
MEMBLOCK_ALLOC_ACCESSIBLE,
cpu_to_node(cpu));
}
static void __init pcpu_fc_free(void *ptr, size_t size)
{
memblock_free_early(__pa(ptr), size);
}
void __init setup_per_cpu_areas(void)
{
unsigned long delta;
unsigned int cpu;
int rc;
/*
* Always reserve area for module percpu variables. That's
* what the legacy allocator did.
*/
rc = pcpu_embed_first_chunk(PERCPU_MODULE_RESERVE,
PERCPU_DYNAMIC_RESERVE, PAGE_SIZE,
pcpu_cpu_distance,
pcpu_fc_alloc, pcpu_fc_free);
if (rc < 0)
panic("Failed to initialize percpu areas.");
delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start;
for_each_possible_cpu(cpu)
__per_cpu_offset[cpu] = delta + pcpu_unit_offsets[cpu];
}
#endif
#ifndef CONFIG_MIPS_PGD_C0_CONTEXT
unsigned long pgd_current[NR_CPUS];
#endif