linux-kernel - Re: [PATCH v4 0/7] arm64: Default to 32-bit wide ZONE

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Date:   Fri, 23 Oct 2020 14:05:45 -0500
From:   Jeremy Linton <jeremy.linton@....com>
To:     Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        robh+dt@...nel.org, catalin.marinas@....com, hch@....de,
        ardb@...nel.org, linux-kernel@...r.kernel.org
Cc:     robin.murphy@....com, linux-arm-kernel@...ts.infradead.org,
        linux-rpi-kernel@...ts.infradead.org,
        iommu@...ts.linux-foundation.org, devicetree@...r.kernel.org,
        will@...nel.org, lorenzo.pieralisi@....com, guohanjun@...wei.com,
        linux-acpi@...r.kernel.org, linux-mm@...ck.org,
        linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v4 0/7] arm64: Default to 32-bit wide ZONE_DMA

Hi,

On 10/21/20 7:34 AM, 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.

I've tested this in ACPI mode on the rpi4 (4+8G with/without the 3G 
limiter) as well, with Ard's IORT patch. Nothing seems to have regressed.

Thanks,

Tested-by: Jeremy Linton <jeremy.linton@....com>




> 
> ---
> 
> 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      | 16 ++++++------
>   drivers/acpi/arm64/iort.c | 52 +++++++++++++++++++++++++++++++++++++++
>   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, 130 insertions(+), 29 deletions(-)
>