On 09/04/16 16:13, Aneesh Kumar K.V wrote:
> Signed-off-by: Aneesh Kumar K.V <aneesh.ku...@linux.vnet.ibm.com>
> ---
> arch/powerpc/include/asm/book3s/64/pgtable.h | 12 ++++++++++++
> arch/powerpc/include/asm/book3s/64/radix.h | 6 ++++++
> arch/powerpc/mm/pgtable-radix.c | 20 ++++++++++++++++++++
> 3 files changed, 38 insertions(+)
>
> diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h
> b/arch/powerpc/include/asm/book3s/64/pgtable.h
> index 623911ed64e9..c16037116625 100644
> --- a/arch/powerpc/include/asm/book3s/64/pgtable.h
> +++ b/arch/powerpc/include/asm/book3s/64/pgtable.h
> @@ -725,6 +725,13 @@ void pgtable_cache_init(void);
> static inline int map_kernel_page(unsigned long ea, unsigned long pa,
> unsigned long flags)
> {
> + if (radix_enabled()) {
> +#if defined(CONFIG_PPC_RADIX_MMU) && defined(DEBUG_VM)
Do you need the defined(CONFIG_PPC_RADIX_MMU) is radix_enabled() not sufficient?
> + unsigned long page_size = 1 <<
> mmu_psize_defs[mmu_io_psize].shift;
> + WARN((page_size != PAGE_SIZE), "I/O page size != PAGE_SIZE");
> +#endif
> + return map_radix_kernel_page(ea, pa, __pgprot(flags),
> PAGE_SIZE);
> + }
> return hlmap_kernel_page(ea, pa, flags);
> }
>
> @@ -732,6 +739,8 @@ static inline int __meminit
> vmemmap_create_mapping(unsigned long start,
> unsigned long page_size,
> unsigned long phys)
> {
> + if (radix_enabled())
> + return rvmemmap_create_mapping(start, page_size, phys);
> return hlvmemmap_create_mapping(start, page_size, phys);
> }
>
> @@ -739,6 +748,9 @@ static inline int __meminit
> vmemmap_create_mapping(unsigned long start,
> static inline void vmemmap_remove_mapping(unsigned long start,
> unsigned long page_size)
> {
> +
> + if (radix_enabled())
> + return rvmemmap_remove_mapping(start, page_size);
> return hlvmemmap_remove_mapping(start, page_size);
> }
> #endif
> diff --git a/arch/powerpc/include/asm/book3s/64/radix.h
> b/arch/powerpc/include/asm/book3s/64/radix.h
> index 806dc2195f85..040c4a56d07b 100644
> --- a/arch/powerpc/include/asm/book3s/64/radix.h
> +++ b/arch/powerpc/include/asm/book3s/64/radix.h
> @@ -133,6 +133,12 @@ static inline int rpmd_trans_huge(pmd_t pmd)
>
> #endif
>
> +extern int __meminit rvmemmap_create_mapping(unsigned long start,
> + unsigned long page_size,
> + unsigned long phys);
> +extern void rvmemmap_remove_mapping(unsigned long start,
> + unsigned long page_size);
> +
> extern int map_radix_kernel_page(unsigned long ea, unsigned long pa,
> pgprot_t flags, unsigned int psz);
> #endif /* __ASSEMBLY__ */
> diff --git a/arch/powerpc/mm/pgtable-radix.c b/arch/powerpc/mm/pgtable-radix.c
> index 5737769469b3..a5d0ae5630b3 100644
> --- a/arch/powerpc/mm/pgtable-radix.c
> +++ b/arch/powerpc/mm/pgtable-radix.c
> @@ -342,3 +342,23 @@ void rsetup_initial_memory_limit(phys_addr_t
> first_memblock_base,
> /* Finally limit subsequent allocations */
> memblock_set_current_limit(first_memblock_base + first_memblock_size);
> }
> +
> +#ifdef CONFIG_SPARSEMEM_VMEMMAP
> +int __meminit rvmemmap_create_mapping(unsigned long start,
> + unsigned long page_size,
> + unsigned long phys)
> +{
> + /* Create a PTE encoding */
> + unsigned long flags = _PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_KERNEL_RW;
> +
> + BUG_ON(map_radix_kernel_page(start, phys, __pgprot(flags), page_size));
> + return 0;
> +}
> +
> +#ifdef CONFIG_MEMORY_HOTPLUG
> +void rvmemmap_remove_mapping(unsigned long start, unsigned long page_size)
> +{
> + /* FIXME!! intel does more. We should free page tables mapping vmemmap
> ? */
You mean x86/x86_64? Are we going to not remove this entry from the kernel page
table?
Will we leave this around?
> +}
> +#endif
> +#endif
>
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