[PATCH v3 3/5] powerpc/mm: add radix__create_section_mapping()
Aneesh Kumar K.V
aneesh.kumar at linux.vnet.ibm.com
Mon Dec 19 20:04:13 AEDT 2016
Reza Arbab <arbab at linux.vnet.ibm.com> writes:
> Add the linear page mapping function for radix, used by memory hotplug.
> This is similar to vmemmap_populate().
>
Ok with this patch your first patch becomes useful. Can you merge that
with this and rename mmu_linear_psize to mmu_hotplug_psize or even use
mmu_virtual_psize. The linear naming is confusing.
> Signed-off-by: Reza Arbab <arbab at linux.vnet.ibm.com>
> ---
> arch/powerpc/include/asm/book3s/64/radix.h | 4 ++++
> arch/powerpc/mm/pgtable-book3s64.c | 2 +-
> arch/powerpc/mm/pgtable-radix.c | 19 +++++++++++++++++++
> 3 files changed, 24 insertions(+), 1 deletion(-)
>
> diff --git a/arch/powerpc/include/asm/book3s/64/radix.h b/arch/powerpc/include/asm/book3s/64/radix.h
> index b4d1302..43c2571 100644
> --- a/arch/powerpc/include/asm/book3s/64/radix.h
> +++ b/arch/powerpc/include/asm/book3s/64/radix.h
> @@ -291,5 +291,9 @@ static inline unsigned long radix__get_tree_size(void)
> }
> return rts_field;
> }
> +
> +#ifdef CONFIG_MEMORY_HOTPLUG
> +int radix__create_section_mapping(unsigned long start, unsigned long end);
> +#endif /* CONFIG_MEMORY_HOTPLUG */
> #endif /* __ASSEMBLY__ */
> #endif
> diff --git a/arch/powerpc/mm/pgtable-book3s64.c b/arch/powerpc/mm/pgtable-book3s64.c
> index 653ff6c..2b13f6b 100644
> --- a/arch/powerpc/mm/pgtable-book3s64.c
> +++ b/arch/powerpc/mm/pgtable-book3s64.c
> @@ -131,7 +131,7 @@ void mmu_cleanup_all(void)
> int create_section_mapping(unsigned long start, unsigned long end)
> {
> if (radix_enabled())
> - return -ENODEV;
> + return radix__create_section_mapping(start, end);
>
> return hash__create_section_mapping(start, end);
> }
> diff --git a/arch/powerpc/mm/pgtable-radix.c b/arch/powerpc/mm/pgtable-radix.c
> index 54bd70e..8201d1f 100644
> --- a/arch/powerpc/mm/pgtable-radix.c
> +++ b/arch/powerpc/mm/pgtable-radix.c
> @@ -465,6 +465,25 @@ void radix__setup_initial_memory_limit(phys_addr_t first_memblock_base,
> memblock_set_current_limit(first_memblock_base + first_memblock_size);
> }
>
> +#ifdef CONFIG_MEMORY_HOTPLUG
> +int radix__create_section_mapping(unsigned long start, unsigned long end)
> +{
> + unsigned long page_size = 1 << mmu_psize_defs[mmu_linear_psize].shift;
> +
> + /* Align to the page size of the linear mapping. */
> + start = _ALIGN_DOWN(start, page_size);
> +
> + for (; start < end; start += page_size) {
> + int rc = radix__map_kernel_page(start, __pa(start),
> + PAGE_KERNEL, page_size);
> + if (rc)
> + return rc;
> + }
> +
> + return 0;
> +}
> +#endif /* CONFIG_MEMORY_HOTPLUG */
> +
> #ifdef CONFIG_SPARSEMEM_VMEMMAP
> int __meminit radix__vmemmap_create_mapping(unsigned long start,
> unsigned long page_size,
> --
> 1.8.3.1
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