linux-kernel - [PATCH 0/6] DISCONTIGMEM support for PPC32

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Date:   Tue, 20 Feb 2018 17:14:18 +0100
From:   Jonathan Neuschäfer <j.neuschaefer@....net>
To:     linuxppc-dev@...ts.ozlabs.org
Cc:     linux-kernel@...r.kernel.org,
        Michael Ellerman <mpe@...erman.id.au>, linux-mm@...ck.org,
        Joel Stanley <joel@....id.au>,
        Jonathan Neuschäfer <j.neuschaefer@....net>
Subject: [PATCH 0/6] DISCONTIGMEM support for PPC32

This patchset adds support for DISCONTIGMEM on 32-bit PowerPC. This is
required to properly support the Nintendo Wii's memory layout, in which
there are two blocks of RAM and MMIO in the middle.

Previously, this memory layout was handled by code that joins the two
RAM blocks into one, reserves the MMIO hole, and permits allocations of
reserved memory in ioremap. This hack didn't work with resource-based
allocation (as used for example in the GPIO driver for Wii[1]), however.

After this patchset, users of the Wii can either select CONFIG_FLATMEM
to get the old behaviour, or CONFIG_DISCONTIGMEM to get the new
behaviour.

Some parts of this patchset are probably not ideal (I'm thinking of my
implementation of pfn_to_nid here), and will require some discussion/
changes.

[1]: https://www.spinics.net/lists/devicetree/msg213956.html

Jonathan Neuschäfer (6):
  powerpc/mm/32: Use pfn_valid to check if pointer is in RAM
  powerpc: numa: Fix overshift on PPC32
  powerpc: numa: Use the right #ifdef guards around functions
  powerpc: numa: Restrict fake NUMA enulation to CONFIG_NUMA systems
  powerpc: Implement DISCONTIGMEM and allow selection on PPC32
  powerpc: wii: Don't rely on reserved memory hack if DISCONTIGMEM is
    set

 arch/powerpc/Kconfig                     |  5 ++++-
 arch/powerpc/include/asm/mmzone.h        | 21 +++++++++++++++++++++
 arch/powerpc/mm/numa.c                   | 18 +++++++++++++++---
 arch/powerpc/mm/pgtable_32.c             |  2 +-
 arch/powerpc/platforms/embedded6xx/wii.c | 10 +++++++---
 5 files changed, 48 insertions(+), 8 deletions(-)

-- 
2.16.1