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Date: Mon, 10 Apr 2017 16:50:59 +0530 From: Sricharan R <sricharan@...eaurora.org> To: robin.murphy@....com, will.deacon@....com, joro@...tes.org, lorenzo.pieralisi@....com, iommu@...ts.linux-foundation.org, linux-arm-kernel@...ts.infradead.org, linux-arm-msm@...r.kernel.org, m.szyprowski@...sung.com, bhelgaas@...gle.com, linux-pci@...r.kernel.org, linux-acpi@...r.kernel.org, tn@...ihalf.com, hanjun.guo@...aro.org, okaya@...eaurora.org, robh+dt@...nel.org, frowand.list@...il.com, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, sudeep.holla@....com, rjw@...ysocki.net, lenb@...nel.org, catalin.marinas@....com, arnd@...db.de, linux-arch@...r.kernel.org, gregkh@...uxfoundation.org Cc: sricharan@...eaurora.org Subject: [PATCH V11 04/11] ACPI/IORT: Add function to check SMMUs drivers presence From: Lorenzo Pieralisi <lorenzo.pieralisi@....com> The IOMMU probe deferral implementation requires a mechanism to detect if drivers for SMMU components are built-in in the kernel to detect whether IOMMU configuration for a given device should be deferred (ie SMMU drivers present but still not probed) or not (drivers not present). Add a simple function to IORT to detect if SMMU drivers for SMMU components managed by IORT are built-in in the kernel. Tested-by: Hanjun Guo <hanjun.guo@...aro.org> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@....com> Reviewed-by: Robin Murphy <robin.murphy@....com> Cc: Sricharan R <sricharan@...eaurora.org> --- drivers/acpi/arm64/iort.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c index 4a5bb96..3dd9ec3 100644 --- a/drivers/acpi/arm64/iort.c +++ b/drivers/acpi/arm64/iort.c @@ -523,6 +523,19 @@ static int arm_smmu_iort_xlate(struct device *dev, u32 streamid, return ret; } +static inline bool iort_iommu_driver_enabled(u8 type) +{ + switch (type) { + case ACPI_IORT_NODE_SMMU_V3: + return IS_BUILTIN(CONFIG_ARM_SMMU_V3); + case ACPI_IORT_NODE_SMMU: + return IS_BUILTIN(CONFIG_ARM_SMMU); + default: + pr_warn("IORT node type %u does not describe an SMMU\n", type); + return false; + } +} + static const struct iommu_ops *iort_iommu_xlate(struct device *dev, struct acpi_iort_node *node, u32 streamid) -- QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation
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