[v7,0/7] arm64: Default to 32-bit wide ZONE_DMA

Using two distinct DMA zones turned out to be problematic. Here's an
attempt go back to a saner default.

I tested this on both a RPi4 and QEMU.

---

Changes since v6:
 - Update patch #1 so we reserve crashkernel before request_standard_resources()
 - Tested on top of Catalin's mem_init() patches.

Changes since v5:
 - Unify ACPI/DT functions

Changes since v4:
 - Fix of_dma_get_max_cpu_address() so it returns the last addressable
   addres, not the limit

Changes since v3:
 - Drop patch adding define in dma-mapping
 - Address small review changes
 - Update Ard's patch
 - Add new patch removing examples from mmzone.h

Changes since v2:
 - Introduce Ard's patch
 - Improve OF dma-ranges parsing function
 - Add unit test for OF function
 - Address small changes
 - Move crashkernel reservation later in boot process

Changes since v1:
 - Parse dma-ranges instead of using machine compatible string

Ard Biesheuvel (1):
  arm64: mm: Set ZONE_DMA size based on early IORT scan

Nicolas Saenz Julienne (6):
  arm64: mm: Move reserve_crashkernel() into mem_init()
  arm64: mm: Move zone_dma_bits initialization into zone_sizes_init()
  of/address: Introduce of_dma_get_max_cpu_address()
  of: unittest: Add test for of_dma_get_max_cpu_address()
  arm64: mm: Set ZONE_DMA size based on devicetree's dma-ranges
  mm: Remove examples from enum zone_type comment

 arch/arm64/mm/init.c      | 22 +++++++++-------
 drivers/acpi/arm64/iort.c | 55 +++++++++++++++++++++++++++++++++++++++
 drivers/of/address.c      | 42 ++++++++++++++++++++++++++++++
 drivers/of/unittest.c     | 18 +++++++++++++
 include/linux/acpi_iort.h |  4 +++
 include/linux/mmzone.h    | 20 --------------
 include/linux/of.h        |  7 +++++
 7 files changed, 139 insertions(+), 29 deletions(-)

On Thu, 19 Nov 2020 18:53:52 +0100, Nicolas Saenz Julienne wrote:
> Using two distinct DMA zones turned out to be problematic. Here's an
> attempt go back to a saner default.
> 
> I tested this on both a RPi4 and QEMU.

Applied to arm64 (for-next/zone-dma-default-32-bit), thanks!

[1/7] arm64: mm: Move reserve_crashkernel() into mem_init()
      https://git.kernel.org/arm64/c/0a30c53573b0
[2/7] arm64: mm: Move zone_dma_bits initialization into zone_sizes_init()
      https://git.kernel.org/arm64/c/9804f8c69b04
[3/7] of/address: Introduce of_dma_get_max_cpu_address()
      https://git.kernel.org/arm64/c/964db79d6c18
[4/7] of: unittest: Add test for of_dma_get_max_cpu_address()
      https://git.kernel.org/arm64/c/07d13a1d6120
[5/7] arm64: mm: Set ZONE_DMA size based on devicetree's dma-ranges
      https://git.kernel.org/arm64/c/8424ecdde7df
[6/7] arm64: mm: Set ZONE_DMA size based on early IORT scan
      https://git.kernel.org/arm64/c/2b8652936f0c
[7/7] mm: Remove examples from enum zone_type comment
      https://git.kernel.org/arm64/c/04435217f968