linux-kernel - Re: [RFC PATCH v2 10/15] drivers: iommu: arm-smmu-v3: enable ACPI driver initialization

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Date:	Tue, 14 Jun 2016 19:12:14 +0100
From:	Will Deacon <will.deacon@....com>
To:	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Cc:	iommu@...ts.linux-foundation.org,
	Robin Murphy <robin.murphy@....com>,
	Joerg Roedel <joro@...tes.org>,
	Marc Zyngier <marc.zyngier@....com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Tomasz Nowicki <tn@...ihalf.com>,
	Hanjun Guo <hanjun.guo@...aro.org>,
	Jon Masters <jcm@...hat.com>,
	Sinan Kaya <okaya@...eaurora.org>, linux-acpi@...r.kernel.org,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [RFC PATCH v2 10/15] drivers: iommu: arm-smmu-v3: enable ACPI
 driver initialization

On Tue, Jun 07, 2016 at 02:31:05PM +0100, Lorenzo Pieralisi wrote:
> On systems booting with ACPI that enable the ARM SMMU components
> in the kernel config options, the ARM SMMU v3 init function
> (ie arm_smmu_init(), that registers the driver and sets-up bus
> iommu operations) does not run only because the device tree interface
> (of_find_matching_node()) fails to find the respective device tree
> nodes for ARM SMMU devices.
> 
> This works as long as there are no ARM SMMU devices to be probed
> with ACPI. If ARM SMMU v3 components are part of the IORT tables,
> for them to be instantiated and probed the function registering
> the ARM SMMU v3 driver must be able to register the driver and
> initialize the bus IOMMU operations accordingly.
> 
> This patch changes the logic in arm-smmu-v3 init call to allow
> for it to be probed in ACPI systems.
> 
> 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/iommu/arm-smmu-v3.c | 13 +++++++++----
>  1 file changed, 9 insertions(+), 4 deletions(-)

Acked-by: Will Deacon <will.deacon@....com>

Will