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From: Rob Herring <robh+dt@kernel.org>
To: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Cc: "open list:GENERIC INCLUDE/ASM HEADER FILES"
	<linux-arch@vger.kernel.org>,
	devicetree@vger.kernel.org,
	"moderated list:BROADCOM BCM2835 ARM ARCHITECTURE"
	<linux-rpi-kernel@lists.infradead.org>,
	Florian Fainelli <f.fainelli@gmail.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Frank Rowand <frowand.list@gmail.com>,
	Eric Anholt <eric@anholt.net>,
	Marc Zyngier <marc.zyngier@arm.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	linux-mm@kvack.org,
	Linux IOMMU <iommu@lists.linux-foundation.org>,
	Matthias Brugger <mbrugger@suse.com>,
	Stefan Wahren <wahrenst@gmx.net>,
	linux-riscv@lists.infradead.org,
	Robin Murphy <robin.murphy@arm.com>,
	Christoph Hellwig <hch@lst.de>,
	"moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE"
	<linux-arm-kernel@lists.infradead.org>,
	phill@raspberryi.org
Subject: Re: [PATCH v2 04/11] of/fdt: add early_init_dt_get_dma_zone_size()
Date: Tue, 20 Aug 2019 12:14:16 -0500
Message-ID: <CAL_Jsq+Nr88Nvd_ZA8eJGm4xLwssv7CnDJLsnZyFqiM=EQWYxg@mail.gmail.com> (raw)
In-Reply-To: <20190820145821.27214-5-nsaenzjulienne@suse.de>

On Tue, Aug 20, 2019 at 9:58 AM Nicolas Saenz Julienne
<nsaenzjulienne@suse.de> wrote:
>
> Some devices might have weird DMA addressing limitations that only apply
> to a subset of the available peripherals. For example the Raspberry Pi 4
> has two interconnects, one able to address the whole lower 4G memory
> area and another one limited to the lower 1G.
>
> Being an uncommon situation we simply hardcode the device wide DMA
> addressable memory size conditionally to the machine compatible name and
> set 'dma_zone_size' accordingly.
>
> Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
>
> ---
>
> Changes in v2:
> - New approach to getting dma_zone_size, instead of parsing the dts we
>   hardcode it conditionally to the machine compatible name.
>
>  drivers/of/fdt.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
>
> diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
> index 06ffbd39d9af..f756e8c05a77 100644
> --- a/drivers/of/fdt.c
> +++ b/drivers/of/fdt.c
> @@ -27,6 +27,7 @@
>
>  #include <asm/setup.h>  /* for COMMAND_LINE_SIZE */
>  #include <asm/page.h>
> +#include <asm/dma.h>   /* for dma_zone_size */
>
>  #include "of_private.h"
>
> @@ -1195,6 +1196,12 @@ void __init early_init_dt_scan_nodes(void)
>         of_scan_flat_dt(early_init_dt_scan_memory, NULL);
>  }
>
> +void __init early_init_dt_get_dma_zone_size(void)

static

With that,

Reviewed-by: Rob Herring <robh@kernel.org>

> +{
> +       if (of_fdt_machine_is_compatible("brcm,bcm2711"))
> +               dma_zone_size = 0x3c000000;
> +}
> +
>  bool __init early_init_dt_scan(void *params)
>  {
>         bool status;
> @@ -1204,6 +1211,7 @@ bool __init early_init_dt_scan(void *params)
>                 return false;
>
>         early_init_dt_scan_nodes();
> +       early_init_dt_get_dma_zone_size();
>         return true;
>  }
>
> --
> 2.22.0
>
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Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-20 14:58 [PATCH v2 00/11] Raspberry Pi 4 DMA addressing support Nicolas Saenz Julienne
2019-08-20 14:58 ` [PATCH v2 01/11] asm-generic: add dma_zone_size Nicolas Saenz Julienne
2019-08-26  7:09   ` Christoph Hellwig
2019-08-26 13:46     ` Nicolas Saenz Julienne
2019-08-28  9:44       ` Nicolas Saenz Julienne
2019-08-30 14:45       ` Catalin Marinas
2019-08-30 17:24         ` Nicolas Saenz Julienne
2019-09-02 13:01           ` Christoph Hellwig
2019-08-20 14:58 ` [PATCH v2 02/11] arm: use generic dma_zone_size Nicolas Saenz Julienne
2019-08-20 14:58 ` [PATCH v2 03/11] of/fdt: add of_fdt_machine_is_compatible function Nicolas Saenz Julienne
2019-08-20 17:16   ` Rob Herring
2019-08-20 17:27     ` Nicolas Saenz Julienne
2019-08-20 14:58 ` [PATCH v2 04/11] of/fdt: add early_init_dt_get_dma_zone_size() Nicolas Saenz Julienne
2019-08-20 17:14   ` Rob Herring [this message]
2019-08-20 14:58 ` [PATCH v2 05/11] arm64: mm: use arm64_dma_phys_limit instead of calling max_zone_dma_phys() Nicolas Saenz Julienne
2019-08-20 14:58 ` [PATCH v2 06/11] arm64: rename variables used to calculate ZONE_DMA32's size Nicolas Saenz Julienne
2019-08-20 14:58 ` [PATCH v2 07/11] arm64: re-introduce max_zone_dma_phys() Nicolas Saenz Julienne
2019-08-20 14:58 ` [PATCH v2 08/11] arm64: use both ZONE_DMA and ZONE_DMA32 Nicolas Saenz Julienne
2019-08-20 14:58 ` [PATCH v2 09/11] dma-direct: turn ARCH_ZONE_DMA_BITS into a variable Nicolas Saenz Julienne
2019-08-26  7:05   ` Christoph Hellwig
2019-08-26 11:33   ` Michael Ellerman
2019-08-20 14:58 ` [PATCH v2 10/11] arm64: edit zone_dma_bits to fine tune dma-direct min mask Nicolas Saenz Julienne
2019-08-26  7:06   ` Christoph Hellwig
2019-08-26 11:08     ` Nicolas Saenz Julienne
2019-08-27  7:03       ` Petr Tesarik
2019-08-20 14:58 ` [PATCH v2 11/11] mm: refresh ZONE_DMA and ZONE_DMA32 comments in 'enum zone_type' Nicolas Saenz Julienne
2019-08-26  7:07   ` Christoph Hellwig

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