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From: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
To: Ard Biesheuvel <ardb@kernel.org>
Cc: iommu@lists.linuxfoundation.org, isaacm@codeaurora.org,
	saravanak@google.com, jean-philippe@linaro.org,
	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org,
	bhelgaas@google.com, will@kernel.org, robin.murphy@arm.com
Subject: Re: [PATCH] iommu/arm-smmu: support SMMU module probing from the IORT
Date: Mon, 25 Nov 2019 16:04:52 +0000	[thread overview]
Message-ID: <20191125160445.GA24078@e121166-lin.cambridge.arm.com> (raw)
In-Reply-To: <20191122174125.21030-1-ardb@kernel.org>

On Fri, Nov 22, 2019 at 06:41:25PM +0100, Ard Biesheuvel wrote:
> Add support for SMMU drivers built as modules to the ACPI/IORT device
> probing path, by deferring the probe of the master if the SMMU driver is
> known to exist but has not been loaded yet. Given that the IORT code
> registers a platform device for each SMMU that it discovers, we can
> easily trigger the udev based autoloading of the SMMU drivers by making
> the platform device identifier part of the module alias.
> 
> Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
> ---
>  drivers/acpi/arm64/iort.c   | 4 ++--
>  drivers/iommu/arm-smmu-v3.c | 1 +
>  drivers/iommu/arm-smmu.c    | 1 +
>  3 files changed, 4 insertions(+), 2 deletions(-)

I think it is best if Will picks this up and add it to the
series that modularize the SMMU drivers:

Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>

> diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
> index 5a7551d060f2..a696457a9b11 100644
> --- a/drivers/acpi/arm64/iort.c
> +++ b/drivers/acpi/arm64/iort.c
> @@ -850,9 +850,9 @@ static inline bool iort_iommu_driver_enabled(u8 type)
>  {
>  	switch (type) {
>  	case ACPI_IORT_NODE_SMMU_V3:
> -		return IS_BUILTIN(CONFIG_ARM_SMMU_V3);
> +		return IS_ENABLED(CONFIG_ARM_SMMU_V3);
>  	case ACPI_IORT_NODE_SMMU:
> -		return IS_BUILTIN(CONFIG_ARM_SMMU);
> +		return IS_ENABLED(CONFIG_ARM_SMMU);
>  	default:
>  		pr_warn("IORT node type %u does not describe an SMMU\n", type);
>  		return false;
> diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
> index 7669beafc493..bf6a1e8eb9b0 100644
> --- a/drivers/iommu/arm-smmu-v3.c
> +++ b/drivers/iommu/arm-smmu-v3.c
> @@ -3733,4 +3733,5 @@ module_platform_driver(arm_smmu_driver);
>  
>  MODULE_DESCRIPTION("IOMMU API for ARM architected SMMUv3 implementations");
>  MODULE_AUTHOR("Will Deacon <will@kernel.org>");
> +MODULE_ALIAS("platform:arm-smmu-v3");
>  MODULE_LICENSE("GPL v2");
> diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
> index d55acc48aee3..db5106b0955b 100644
> --- a/drivers/iommu/arm-smmu.c
> +++ b/drivers/iommu/arm-smmu.c
> @@ -2292,4 +2292,5 @@ module_platform_driver(arm_smmu_driver);
>  
>  MODULE_DESCRIPTION("IOMMU API for ARM architected SMMU implementations");
>  MODULE_AUTHOR("Will Deacon <will@kernel.org>");
> +MODULE_ALIAS("platform:arm-smmu");
>  MODULE_LICENSE("GPL v2");
> -- 
> 2.20.1
> 
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iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu

  parent reply	other threads:[~2019-11-25 16:05 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-21 11:49 [PATCH v3 00/14] iommu: Permit modular builds of ARM SMMU[v3] drivers Will Deacon
2019-11-21 11:49 ` [PATCH v3 01/14] drivers/iommu: Export core IOMMU API symbols to permit modular drivers Will Deacon
2019-11-21 11:49 ` [PATCH v3 02/14] iommu/of: Request ACS from the PCI core when configuring IOMMU linkage Will Deacon
2019-11-21 11:49 ` [PATCH v3 03/14] PCI: Export pci_ats_disabled() as a GPL symbol to modules Will Deacon
2019-11-21 11:49 ` [PATCH v3 04/14] drivers/iommu: Take a ref to the IOMMU driver prior to ->add_device() Will Deacon
2019-11-21 11:49 ` [PATCH v3 05/14] iommu/of: Take a ref to the IOMMU driver during ->of_xlate() Will Deacon
2019-11-21 11:49 ` [PATCH v3 06/14] drivers/iommu: Allow IOMMU bus ops to be unregistered Will Deacon
2019-11-21 11:49 ` [PATCH v3 07/14] Revert "iommu/arm-smmu: Make arm-smmu-v3 explicitly non-modular" Will Deacon
2019-11-21 11:49 ` [PATCH v3 08/14] Revert "iommu/arm-smmu: Make arm-smmu " Will Deacon
2019-11-21 11:49 ` [PATCH v3 09/14] iommu/arm-smmu: Prevent forced unbinding of Arm SMMU drivers Will Deacon
2019-11-26  9:13   ` John Garry
2019-11-26 20:27     ` Saravana Kannan via iommu
2019-11-27 11:04       ` John Garry
2019-11-27 11:41         ` John Garry
2019-11-21 11:49 ` [PATCH v3 10/14] iommu/arm-smmu-v3: Unregister IOMMU and bus ops on device removal Will Deacon
2019-11-21 11:49 ` [PATCH v3 11/14] iommu/arm-smmu-v3: Allow building as a module Will Deacon
2019-11-21 11:49 ` [PATCH v3 12/14] iommu/arm-smmu: Unregister IOMMU and bus ops on device removal Will Deacon
2019-11-21 11:49 ` [PATCH v3 13/14] iommu/arm-smmu: Allow building as a module Will Deacon
2019-11-21 11:49 ` [PATCH v3 14/14] iommu/arm-smmu: Update my email address in MODULE_AUTHOR() Will Deacon
2019-11-22 17:41 ` [PATCH] iommu/arm-smmu: support SMMU module probing from the IORT Ard Biesheuvel
2019-11-25 12:16   ` Robin Murphy
2019-11-25 16:04   ` Lorenzo Pieralisi [this message]
2019-11-27 16:20     ` John Garry

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