On Wed, 14 Jun 2017 16:11:44 -0400
Jérôme Glisse <jglisse@xxxxxxxxxx> wrote:
> This just simplify kconfig and allow HMM and DEVICE_PUBLIC to be
> selected for ppc64 once ZONE_DEVICE is allowed on ppc64 (different
> patchset).
>
> Signed-off-by: Jérôme Glisse <jglisse@xxxxxxxxxx>
> Signed-off-by: John Hubbard <jhubbard@xxxxxxxxxx>
> Cc: Balbir Singh <balbirs@xxxxxxxxxxx>
> Cc: Aneesh Kumar <aneesh.kumar@xxxxxxxxxxxxxxxxxx>
> Cc: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
> Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
> ---
> include/linux/hmm.h | 4 ++--
> mm/Kconfig | 27 ++++++---------------------
> mm/hmm.c | 4 ++--
> 3 files changed, 10 insertions(+), 25 deletions(-)
>
> diff --git a/include/linux/hmm.h b/include/linux/hmm.h
> index f6713b2..720d18c 100644
> --- a/include/linux/hmm.h
> +++ b/include/linux/hmm.h
> @@ -327,7 +327,7 @@ int hmm_vma_fault(struct vm_area_struct *vma,
> #endif /* IS_ENABLED(CONFIG_HMM_MIRROR) */
>
>
> -#if IS_ENABLED(CONFIG_HMM_DEVMEM)
> +#if IS_ENABLED(CONFIG_DEVICE_PRIVATE) || IS_ENABLED(CONFIG_DEVICE_PUBLIC)
> struct hmm_devmem;
>
> struct page *hmm_vma_alloc_locked_page(struct vm_area_struct *vma,
> @@ -456,7 +456,7 @@ struct hmm_device {
> */
> struct hmm_device *hmm_device_new(void *drvdata);
> void hmm_device_put(struct hmm_device *hmm_device);
> -#endif /* IS_ENABLED(CONFIG_HMM_DEVMEM) */
> +#endif /* CONFIG_DEVICE_PRIVATE || CONFIG_DEVICE_PUBLIC */
>
>
> /* Below are for HMM internal use only! Not to be used by device driver! */
> diff --git a/mm/Kconfig b/mm/Kconfig
> index ad082b9..7de939a 100644
> --- a/mm/Kconfig
> +++ b/mm/Kconfig
> @@ -265,7 +265,7 @@ config ARCH_ENABLE_HUGEPAGE_MIGRATION
> config ARCH_HAS_HMM
> bool
> default y
> - depends on X86_64
> + depends on X86_64 || PPC64
Ideally we want to make this (PPC64 && PPC_BOOK3S)
> depends on ZONE_DEVICE
> depends on MMU && 64BIT
> depends on MEMORY_HOTPLUG
> @@ -277,7 +277,7 @@ config HMM
>
> config HMM_MIRROR
> bool "HMM mirror CPU page table into a device page table"
> - depends on ARCH_HAS_HMM
> + depends on ARCH_HAS_HMM && X86_64
We would need HMM_MIRROR for the generation of hardware that does
not have CDM
> select MMU_NOTIFIER
> select HMM
> help
> @@ -287,15 +287,6 @@ config HMM_MIRROR
> page tables (at PAGE_SIZE granularity), and must be able to recover from
> the resulting potential page faults.
>
> -config HMM_DEVMEM
> - bool "HMM device memory helpers (to leverage ZONE_DEVICE)"
> - depends on ARCH_HAS_HMM
> - select HMM
> - help
> - HMM devmem is a set of helper routines to leverage the ZONE_DEVICE
> - feature. This is just to avoid having device drivers to replicating a lot
> - of boiler plate code. See Documentation/vm/hmm.txt.
> -
> config PHYS_ADDR_T_64BIT
> def_bool 64BIT || ARCH_PHYS_ADDR_T_64BIT
>
> @@ -720,11 +711,8 @@ config ZONE_DEVICE
>
> config DEVICE_PRIVATE
> bool "Unaddressable device memory (GPU memory, ...)"
> - depends on X86_64
> - depends on ZONE_DEVICE
> - depends on MEMORY_HOTPLUG
> - depends on MEMORY_HOTREMOVE
> - depends on SPARSEMEM_VMEMMAP
> + depends on ARCH_HAS_HMM && X86_64
Same as above
> + select HMM
>
> help
> Allows creation of struct pages to represent unaddressable device
> @@ -733,11 +721,8 @@ config DEVICE_PRIVATE
>
> config DEVICE_PUBLIC
> bool "Unaddressable device memory (GPU memory, ...)"
The unaddressable is a typo from above.
> - depends on X86_64
> - depends on ZONE_DEVICE
> - depends on MEMORY_HOTPLUG
> - depends on MEMORY_HOTREMOVE
> - depends on SPARSEMEM_VMEMMAP
> + depends on ARCH_HAS_HMM
> + select HMM
>
Balbir Singh.
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