Commit e4dadfa8 authored by Lorenzo Pieralisi's avatar Lorenzo Pieralisi Committed by Will Deacon
Browse files

iommu/arm-smmu-v3: Add IORT configuration 



In ACPI bases systems, in order to be able to create platform
devices and initialize them for ARM SMMU v3 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 v3 components.

Add static configuration functions to the IORT kernel layer for
the ARM SMMU v3 components, so that the ARM SMMU v3 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: default avatarLorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: default avatarTomasz Nowicki <tn@semihalf.com>
Tested-by: default avatarHanjun Guo <hanjun.guo@linaro.org>
Tested-by: default avatarTomasz Nowicki <tn@semihalf.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Robin Murphy <robin.murphy@arm.com>
Cc: Joerg Roedel <joro@8bytes.org>
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
parent 2985b521

drivers/acpi/arm64/iort.c

+102 −1
Original line number Diff line number Diff line
@@ -459,6 +459,95 @@ struct irq_domain *iort_get_device_domain(struct device *dev, u32 req_id) 
	return irq_find_matching_fwnode(handle, DOMAIN_BUS_PCI_MSI);

}



static void __init acpi_iort_register_irq(int hwirq, const char *name,

					  int trigger,

					  struct resource *res)

{

	int irq = acpi_register_gsi(NULL, hwirq, trigger,

				    ACPI_ACTIVE_HIGH);



	if (irq <= 0) {

		pr_err("could not register gsi hwirq %d name [%s]\n", hwirq,

								      name);

		return;

	}



	res->start = irq;

	res->end = irq;

	res->flags = IORESOURCE_IRQ;

	res->name = name;

}



static int __init arm_smmu_v3_count_resources(struct acpi_iort_node *node)

{

	struct acpi_iort_smmu_v3 *smmu;

	/* Always present mem resource */

	int num_res = 1;



	/* Retrieve SMMUv3 specific data */

	smmu = (struct acpi_iort_smmu_v3 *)node->node_data;



	if (smmu->event_gsiv)

		num_res++;



	if (smmu->pri_gsiv)

		num_res++;



	if (smmu->gerr_gsiv)

		num_res++;



	if (smmu->sync_gsiv)

		num_res++;



	return num_res;

}



static void __init arm_smmu_v3_init_resources(struct resource *res,

					      struct acpi_iort_node *node)

{

	struct acpi_iort_smmu_v3 *smmu;

	int num_res = 0;



	/* Retrieve SMMUv3 specific data */

	smmu = (struct acpi_iort_smmu_v3 *)node->node_data;



	res[num_res].start = smmu->base_address;

	res[num_res].end = smmu->base_address + SZ_128K - 1;

	res[num_res].flags = IORESOURCE_MEM;



	num_res++;



	if (smmu->event_gsiv)

		acpi_iort_register_irq(smmu->event_gsiv, "eventq",

				       ACPI_EDGE_SENSITIVE,

				       &res[num_res++]);



	if (smmu->pri_gsiv)

		acpi_iort_register_irq(smmu->pri_gsiv, "priq",

				       ACPI_EDGE_SENSITIVE,

				       &res[num_res++]);



	if (smmu->gerr_gsiv)

		acpi_iort_register_irq(smmu->gerr_gsiv, "gerror",

				       ACPI_EDGE_SENSITIVE,

				       &res[num_res++]);



	if (smmu->sync_gsiv)

		acpi_iort_register_irq(smmu->sync_gsiv, "cmdq-sync",

				       ACPI_EDGE_SENSITIVE,

				       &res[num_res++]);

}



static bool __init arm_smmu_v3_is_coherent(struct acpi_iort_node *node)

{

	struct acpi_iort_smmu_v3 *smmu;



	/* Retrieve SMMUv3 specific data */

	smmu = (struct acpi_iort_smmu_v3 *)node->node_data;



	return smmu->flags & ACPI_IORT_SMMU_V3_COHACC_OVERRIDE;

}



struct iort_iommu_config {

	const char *name;

	int (*iommu_init)(struct acpi_iort_node *node);
@@ -468,11 +557,23 @@ struct iort_iommu_config { 
				     struct acpi_iort_node *node);

};



static const struct iort_iommu_config iort_arm_smmu_v3_cfg __initconst = {

	.name = "arm-smmu-v3",

	.iommu_is_coherent = arm_smmu_v3_is_coherent,

	.iommu_count_resources = arm_smmu_v3_count_resources,

	.iommu_init_resources = arm_smmu_v3_init_resources

};



static __init

const struct iort_iommu_config *iort_get_iommu_cfg(struct acpi_iort_node *node)

{

	switch (node->type) {

	case ACPI_IORT_NODE_SMMU_V3:

		return &iort_arm_smmu_v3_cfg;

	default:

		return NULL;

	}

}



/**

 * iort_add_smmu_platform_device() - Allocate a platform device for SMMU

drivers/iommu/arm-smmu-v3.c

+48 −1
Original line number Diff line number Diff line
@@ -20,6 +20,8 @@ 
 * This driver is powered by bad coffee and bombay mix.

 */



#include <linux/acpi.h>

#include <linux/acpi_iort.h>

#include <linux/delay.h>

#include <linux/dma-iommu.h>

#include <linux/err.h>
@@ -2559,6 +2561,32 @@ static int arm_smmu_device_hw_probe(struct arm_smmu_device *smmu) 
	return 0;

}



#ifdef CONFIG_ACPI

static int arm_smmu_device_acpi_probe(struct platform_device *pdev,

				      struct arm_smmu_device *smmu)

{

	struct acpi_iort_smmu_v3 *iort_smmu;

	struct device *dev = smmu->dev;

	struct acpi_iort_node *node;



	node = *(struct acpi_iort_node **)dev_get_platdata(dev);



	/* Retrieve SMMUv3 specific data */

	iort_smmu = (struct acpi_iort_smmu_v3 *)node->node_data;



	if (iort_smmu->flags & ACPI_IORT_SMMU_V3_COHACC_OVERRIDE)

		smmu->features |= ARM_SMMU_FEAT_COHERENCY;



	return 0;

}

#else

static inline int arm_smmu_device_acpi_probe(struct platform_device *pdev,

					     struct arm_smmu_device *smmu)

{

	return -ENODEV;

}

#endif



static int arm_smmu_device_dt_probe(struct platform_device *pdev,

				    struct arm_smmu_device *smmu)

{
@@ -2624,8 +2652,16 @@ static int arm_smmu_device_probe(struct platform_device *pdev) 
	if (irq > 0)

		smmu->gerr_irq = irq;



	if (dev->of_node) {

		ret = arm_smmu_device_dt_probe(pdev, smmu);

	} else {

		ret = arm_smmu_device_acpi_probe(pdev, smmu);

		if (ret == -ENODEV)

			return ret;

	}



	/* Set bypass mode according to firmware probing result */

	bypass = !!arm_smmu_device_dt_probe(pdev, smmu);

	bypass = !!ret;



	/* Probe the h/w */

	ret = arm_smmu_device_hw_probe(smmu);
@@ -2728,6 +2764,17 @@ static int __init arm_smmu_of_init(struct device_node *np) 
}

IOMMU_OF_DECLARE(arm_smmuv3, "arm,smmu-v3", arm_smmu_of_init);



#ifdef CONFIG_ACPI

static int __init acpi_smmu_v3_init(struct acpi_table_header *table)

{

	if (iort_node_match(ACPI_IORT_NODE_SMMU_V3))

		return arm_smmu_init();



	return 0;

}

IORT_ACPI_DECLARE(arm_smmu_v3, ACPI_SIG_IORT, acpi_smmu_v3_init);

#endif



MODULE_DESCRIPTION("IOMMU API for ARM architected SMMUv3 implementations");

MODULE_AUTHOR("Will Deacon <will.deacon@arm.com>");

MODULE_LICENSE("GPL v2");

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