From: Dan Williams <dan.j.williams@intel.com>
To: Mike Rapoport <rppt@linux.ibm.com>
Cc: Justin He <Justin.He@arm.com>, Michal Hocko <mhocko@kernel.org>,
David Hildenbrand <david@redhat.com>,
Catalin Marinas <Catalin.Marinas@arm.com>,
Will Deacon <will@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Baoquan He <bhe@redhat.com>, Chuhong Yuan <hslester96@gmail.com>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"linux-nvdimm@lists.01.org" <linux-nvdimm@lists.01.org>,
Kaly Xin <Kaly.Xin@arm.com>
Subject: Re: [PATCH v2 1/3] arm64/numa: export memory_add_physaddr_to_nid as EXPORT_SYMBOL_GPL
Date: Tue, 7 Jul 2020 23:53:39 -0700 [thread overview]
Message-ID: <CAPcyv4iiHz7rofPKpKhiYMyPpf1ySQBW2HMwHcCtjb2wLiK7ZQ@mail.gmail.com> (raw)
In-Reply-To: <20200708062217.GE386073@linux.ibm.com>
On Tue, Jul 7, 2020 at 11:22 PM Mike Rapoport <rppt@linux.ibm.com> wrote:
[..]
> > > Thanks for your suggestion,
> > > Could I wrap the codes and let memory_add_physaddr_to_nid simply invoke
> > > phys_to_target_node()?
> >
> > I think it needs to be the reverse. phys_to_target_node() should call
> > memory_add_physaddr_to_nid() by default, but fall back to searching
> > reserved memory address ranges in memblock. See phys_to_target_node()
> > in arch/x86/mm/numa.c. That one uses numa_meminfo instead of memblock,
> > but the principle is the same i.e. that a target node may not be
> > represented in memblock.memory, but memblock.reserved. I'm working on
> > a patch to provide a function similar to get_pfn_range_for_nid() that
> > operates on reserved memory.
>
> Do we really need yet another memblock iterator?
> I think only x86 has memory that is not in memblock.memory but only in
> memblock.reserved.
Well, that's what led me here. EFI has introduced a memory attribute
called "EFI Special Purpose Memory". I mapped it to a new Linux
concept called Soft Reserved memory (commit b617c5266eed "efi: Common
enable/disable infrastructure for EFI soft reservation"). The driver I
want to claim that memory, device-dax, wants to be able to look up
numa information for an address range that is marked reserved in
memblock. The device-dax facility has the ability to either let
userspace map a device, or assign the memory backing that device to
the page allocator. In both scenarios the driver needs numa info to
either populate the 'numa_node' property of the device in sysfs, or to
pass an node-id to add_memory_resource() when it is hot-plugged.
I was thwarted by the lack of phys_to_target_node() on arm64, and
rather than add another stub like memory_add_physaddr_to_nid() I
wanted to see if it could be solved properly / generically with
memblock data.
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next prev parent reply other threads:[~2020-07-08 6:53 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-07 5:59 [PATCH v2 0/3] Fix and enable pmem as RAM device on arm64 Jia He
2020-07-07 5:59 ` [PATCH v2 1/3] arm64/numa: export memory_add_physaddr_to_nid as EXPORT_SYMBOL_GPL Jia He
2020-07-07 11:35 ` David Hildenbrand
2020-07-07 11:54 ` Michal Hocko
2020-07-07 12:13 ` Mike Rapoport
2020-07-07 12:26 ` David Hildenbrand
2020-07-07 18:00 ` Mike Rapoport
2020-07-07 22:05 ` Dan Williams
2020-07-08 5:27 ` Mike Rapoport
2020-07-08 7:21 ` David Hildenbrand
2020-07-08 7:38 ` Mike Rapoport
2020-07-08 7:40 ` David Hildenbrand
2020-07-08 7:50 ` Dan Williams
2020-07-08 8:26 ` David Hildenbrand
2020-07-08 8:39 ` Mike Rapoport
2020-07-08 8:45 ` David Hildenbrand
2020-07-08 9:15 ` Mike Rapoport
2020-07-08 9:25 ` David Hildenbrand
2020-07-08 9:45 ` Mike Rapoport
2020-07-08 10:04 ` David Hildenbrand
2020-07-08 15:50 ` Dan Williams
2020-07-08 16:10 ` David Hildenbrand
2020-07-08 16:47 ` Mike Rapoport
2020-07-08 2:20 ` Justin He
2020-07-08 3:56 ` Dan Williams
2020-07-08 4:08 ` Justin He
2020-07-08 4:27 ` Dan Williams
2020-07-08 6:22 ` Mike Rapoport
2020-07-08 6:53 ` Dan Williams [this message]
2020-07-08 6:59 ` David Hildenbrand
2020-07-08 7:04 ` Dan Williams
2020-07-08 7:16 ` David Hildenbrand
2020-07-08 7:43 ` Mike Rapoport
2020-07-08 5:32 ` Mike Rapoport
2020-07-08 5:48 ` Dan Williams
2020-07-08 6:19 ` Mike Rapoport
2020-07-08 6:44 ` Dan Williams
2020-07-08 6:56 ` Justin He
2020-07-08 7:00 ` David Hildenbrand
2020-07-07 5:59 ` [RFC PATCH v2 2/3] device-dax: use fallback nid when numa_node is invalid Jia He
2020-07-07 6:08 ` Justin He
2020-07-07 11:34 ` David Hildenbrand
2020-07-08 1:41 ` Justin He
2020-07-07 5:59 ` [PATCH v2 3/3] mm/memory_hotplug: fix unpaired mem_hotplug_begin/done Jia He
2020-07-07 10:06 ` Michal Hocko
2020-07-07 11:31 ` David Hildenbrand
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