[PATCH v3 0/8] arm64: Default to 32-bit wide ZONE_DMA

Nicolas Saenz Julienne
2020-10-14T19:12:26Z

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.

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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 (7):
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()
dma-direct: Turn zone_dma_bits default value into a define
arm64: mm: Set ZONE_DMA size based on devicetree's dma-ranges
mm: Update DMA zones description

arch/arm64/include/asm/processor.h | 1 +
arch/arm64/mm/init.c | 20 ++++++------
drivers/acpi/arm64/iort.c | 51 ++++++++++++++++++++++++++++++
drivers/of/address.c | 42 ++++++++++++++++++++++++
drivers/of/unittest.c | 20 ++++++++++++
include/linux/acpi_iort.h | 4 +++
include/linux/dma-direct.h | 3 ++
include/linux/mmzone.h | 5 +--
include/linux/of.h | 7 ++++
kernel/dma/direct.c | 2 +-
10 files changed, 143 insertions(+), 12 deletions(-)

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2.28.0