linux-kernel - Re: [PATCH v6 13/16] drivers: iommu: arm-smmu: add IORT configuration

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Message-ID: <f8ec1ef0-9fbd-7dd6-822a-ca91aafe986a@semihalf.com>
Date:   Wed, 9 Nov 2016 14:24:49 +0100
From:   Tomasz Nowicki <tn@...ihalf.com>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        iommu@...ts.linux-foundation.org,
        Eric Auger <eric.auger@...hat.com>
Cc:     Will Deacon <will.deacon@....com>,
        Robin Murphy <robin.murphy@....com>,
        Joerg Roedel <joro@...tes.org>,
        Marc Zyngier <marc.zyngier@....com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Hanjun Guo <hanjun.guo@...aro.org>,
        Jon Masters <jcm@...hat.com>,
        Sinan Kaya <okaya@...eaurora.org>,
        Nate Watterson <nwatters@...eaurora.org>,
        Prem Mallappa <prem.mallappa@...adcom.com>,
        Dennis Chen <dennis.chen@....com>, linux-acpi@...r.kernel.org,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v6 13/16] drivers: iommu: arm-smmu: add IORT configuration

Hi Lorenzo,

On 18.10.2016 18:04, Lorenzo Pieralisi wrote:
> In ACPI bases systems, in order to be able to create platform
> devices and initialize them for ARM SMMU components, the IORT
> kernel implementation requires a set of static functions to be
> used by the IORT kernel layer to configure platform devices for
> ARM SMMU components.
>
> Add static configuration functions to the IORT kernel layer for
> the ARM SMMU components, so that the ARM SMMU driver can
> initialize its respective platform device by relying on the IORT
> kernel infrastructure and by adding a corresponding ACPI device
> early probe section entry.
>
> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
> Cc: Will Deacon <will.deacon@....com>
> Cc: Robin Murphy <robin.murphy@....com>
> Cc: Joerg Roedel <joro@...tes.org>
> ---
>  drivers/acpi/arm64/iort.c | 81 +++++++++++++++++++++++++++++++++++++++++++++
>  drivers/iommu/arm-smmu.c  | 84 ++++++++++++++++++++++++++++++++++++++++++++++-
>  include/linux/acpi_iort.h |  3 ++
>  3 files changed, 167 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
> index ea90bc8..04cc5f7 100644
> --- a/drivers/acpi/arm64/iort.c
> +++ b/drivers/acpi/arm64/iort.c
> @@ -548,6 +548,78 @@ static bool __init arm_smmu_v3_is_coherent(struct acpi_iort_node *node)
>  	return smmu->flags & ACPI_IORT_SMMU_V3_COHACC_OVERRIDE;
>  }
>
[...]
> +
> +static int arm_smmu_device_acpi_probe(struct platform_device *pdev,
> +				      struct arm_smmu_device *smmu)
> +{
> +	struct device *dev = smmu->dev;
> +	struct acpi_iort_node *node =
> +		*(struct acpi_iort_node **)dev_get_platdata(dev);
> +	struct acpi_iort_smmu *iort_smmu;
> +	u64 *glb_irq;
> +	int ret;
> +
> +	/* Retrieve SMMU1/2 specific data */
> +	iort_smmu = (struct acpi_iort_smmu *)node->node_data;
> +
> +	ret = acpi_smmu_get_data(iort_smmu->model, &smmu->version,
> +						   &smmu->model);
> +	if (ret < 0)
> +		return ret;
> +
> +	glb_irq = ACPI_ADD_PTR(u64, iort_smmu,
> +			iort_smmu->global_interrupt_offset);

One bug that I found:

-	glb_irq = ACPI_ADD_PTR(u64, iort_smmu,
-			iort_smmu->global_interrupt_offset);
+	glb_irq = ACPI_ADD_PTR(u64, node,
+			iort_smmu->global_interrupt_offset);

With this fix, I run VM with several PCI devices (NIC, SATA) in 
passthrough mode successfully on ACPI host using ThunderX 1-socket board.

Also, for my tests I used Eric's patches:
https://github.com/eauger/linux/commits/v4.9-rc3-reserved-rfc-v2

Including bug fix above:
Tested-by: Tomasz Nowicki <tn@...ihalf.com> for all series.

> +
> +	if (!IORT_IRQ_MASK(glb_irq[1]))	/* 0 means not implemented */
> +		smmu->num_global_irqs = 1;
> +	else
> +		smmu->num_global_irqs = 2;
> +
> +	if (iort_smmu->flags & ACPI_IORT_SMMU_COHERENT_WALK)
> +		smmu->features |= ARM_SMMU_FEAT_COHERENT_WALK;
> +
> +	return 0;
> +}
> +#else
> +static inline int arm_smmu_device_acpi_probe(struct platform_device *pdev,
> +					     struct arm_smmu_device *smmu)
> +{
> +	return -ENODEV;
> +}
> +#endif
> +

Thanks,
Tomasz