From: Catalin Marinas <catalin.marinas@arm.com>
To: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Cc: robh+dt@kernel.org, hch@lst.de, ardb@kernel.org,
linux-kernel@vger.kernel.org,
Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
Hanjun Guo <guohanjun@huawei.com>,
Sudeep Holla <sudeep.holla@arm.com>,
robin.murphy@arm.com, linux-arm-kernel@lists.infradead.org,
linux-rpi-kernel@lists.infradead.org, jeremy.linton@arm.com,
iommu@lists.linux-foundation.org, devicetree@vger.kernel.org,
will@kernel.org, Anshuman Khandual <anshuman.khandual@arm.com>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
Len Brown <lenb@kernel.org>,
linux-acpi@vger.kernel.org
Subject: Re: [PATCH v5 6/7] arm64: mm: Set ZONE_DMA size based on early IORT scan
Date: Fri, 30 Oct 2020 18:00:55 +0000 [thread overview]
Message-ID: <20201030180055.GD23196@gaia> (raw)
In-Reply-To: <20201029172550.3523-7-nsaenzjulienne@suse.de>
On Thu, Oct 29, 2020 at 06:25:49PM +0100, Nicolas Saenz Julienne wrote:
> diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
> index 9929ff50c0c0..05fe4a076bab 100644
> --- a/drivers/acpi/arm64/iort.c
> +++ b/drivers/acpi/arm64/iort.c
> @@ -1718,3 +1718,55 @@ void __init acpi_iort_init(void)
>
> iort_init_platform_devices();
> }
> +
> +#ifdef CONFIG_ZONE_DMA
> +/*
> + * Check the IORT whether any devices exist whose DMA mask is < 32 bits.
> + * If so, return the smallest value encountered, or 32 otherwise.
> + */
> +unsigned int __init acpi_iort_get_zone_dma_size(void)
> +{
> + struct acpi_table_iort *iort;
> + struct acpi_iort_node *node, *end;
> + acpi_status status;
> + u8 limit = 32;
Nitpick: can we not return PHYS_ADDR_MAX here, for consistency with
of_dma_get_max_cpu_address()? There wouldn't be any functional change.
--
Catalin
next prev parent reply other threads:[~2020-10-30 18:01 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-29 17:25 [PATCH v5 0/7] arm64: Default to 32-bit wide ZONE_DMA Nicolas Saenz Julienne
2020-10-29 17:25 ` [PATCH v5 6/7] arm64: mm: Set ZONE_DMA size based on early IORT scan Nicolas Saenz Julienne
2020-10-30 18:00 ` Catalin Marinas [this message]
2020-10-30 18:11 ` [PATCH v5 0/7] arm64: Default to 32-bit wide ZONE_DMA Catalin Marinas
2020-11-03 17:00 ` Nicolas Saenz Julienne
2020-11-03 18:51 ` Catalin Marinas
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