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Date:   Fri, 14 Feb 2020 08:56:22 +0530
From:   "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>
To:     Dan Williams <dan.j.williams@...el.com>,
        Jeff Moyer <jmoyer@...hat.com>
Cc:     linux-nvdimm <linux-nvdimm@...ts.01.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Vishal L Verma <vishal.l.verma@...el.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH v2 1/4] mm/memremap_pages: Introduce
 memremap_compat_align()

Dan Williams <dan.j.williams@...el.com> writes:

> On Thu, Feb 13, 2020 at 8:58 AM Jeff Moyer <jmoyer@...hat.com> wrote:
>>
>> Dan Williams <dan.j.williams@...el.com> writes:
>>
>> > The "sub-section memory hotplug" facility allows memremap_pages() users
>> > like libnvdimm to compensate for hardware platforms like x86 that have a
>> > section size larger than their hardware memory mapping granularity.  The
>> > compensation that sub-section support affords is being tolerant of
>> > physical memory resources shifting by units smaller (64MiB on x86) than
>> > the memory-hotplug section size (128 MiB). Where the platform
>> > physical-memory mapping granularity is limited by the number and
>> > capability of address-decode-registers in the memory controller.
>> >
>> > While the sub-section support allows memremap_pages() to operate on
>> > sub-section (2MiB) granularity, the Power architecture may still
>> > require 16MiB alignment on "!radix_enabled()" platforms.
>> >
>> > In order for libnvdimm to be able to detect and manage this per-arch
>> > limitation, introduce memremap_compat_align() as a common minimum
>> > alignment across all driver-facing memory-mapping interfaces, and let
>> > Power override it to 16MiB in the "!radix_enabled()" case.
>> >
>> > The assumption / requirement for 16MiB to be a viable
>> > memremap_compat_align() value is that Power does not have platforms
>> > where its equivalent of address-decode-registers never hardware remaps a
>> > persistent memory resource on smaller than 16MiB boundaries. Note that I
>> > tried my best to not add a new Kconfig symbol, but header include
>> > entanglements defeated the #ifndef memremap_compat_align design pattern
>> > and the need to export it defeats the __weak design pattern for arch
>> > overrides.
>> >
>> > Based on an initial patch by Aneesh.
>>
>> I have just a couple of questions.
>>
>> First, can you please add a comment above the generic implementation of
>> memremap_compat_align describing its purpose, and why a platform might
>> want to override it?
>
> Sure, how about:
>
> /*
>  * The memremap() and memremap_pages() interfaces are alternately used
>  * to map persistent memory namespaces. These interfaces place different
>  * constraints on the alignment and size of the mapping (namespace).
>  * memremap() can map individual PAGE_SIZE pages. memremap_pages() can
>  * only map subsections (2MB), and at least one architecture (PowerPC)
>  * the minimum mapping granularity of memremap_pages() is 16MB.
>  *
>  * The role of memremap_compat_align() is to communicate the minimum
>  * arch supported alignment of a namespace such that it can freely
>  * switch modes without violating the arch constraint. Namely, do not
>  * allow a namespace to be PAGE_SIZE aligned since that namespace may be
>  * reconfigured into a mode that requires SUBSECTION_SIZE alignment.
>  */
>
>> Second, I will take it at face value that the power architecture
>> requires a 16MB alignment, but it's not clear to me why mmu_linear_psize
>> was chosen to represent that.  What's the relationship, there, and can
>> we please have a comment explaining it?
>
> Aneesh, can you help here?

With hash translation, we map the direct-map range with just one page
size. Based on different restrictions as described in htab_init_page_sizes
we can end up choosing 16M, 64K or even 4K. We use the variable
mmu_linear_psize to indicate which page size we used for direct-map
range. 

ie we should do. 

 +unsigned long arch_namespace_align_size(void)
 +{
 +	unsigned long sub_section_size = (1UL << SUBSECTION_SHIFT);
 +
 +	if (radix_enabled())
 +		return sub_section_size;
 +	return max(sub_section_size, (1UL << mmu_psize_defs[mmu_linear_psize].shift));
 +
 +}
 +EXPORT_SYMBOL_GPL(arch_namespace_align_size);

as done here

https://lore.kernel.org/linux-nvdimm/20200120140749.69549-4-aneesh.kumar@linux.ibm.com/

Dan can you update the powerpc definition?

-aneesh

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