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Commit 50019f09 authored by Eric Auger's avatar Eric Auger Committed by Will Deacon
Browse files

iommu/arm-smmu-v3: Implement reserved region get/put callbacks 



The get() populates the list with the MSI IOVA reserved window.

At the moment an arbitray MSI IOVA window is set at 0x8000000
of size 1MB. This will allow to report those info in iommu-group
sysfs.

Signed-off-by: default avatarEric Auger <eric.auger@redhat.com>
Acked-by: default avatarWill Deacon <will.deacon@arm.com>
Reviewed-by: default avatarTomasz Nowicki <tomasz.nowicki@caviumnetworks.com>
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
parent f3ebee80

drivers/iommu/arm-smmu-v3.c

+28 −0
Original line number Diff line number Diff line
@@ -412,6 +412,9 @@ 
/* High-level queue structures */

#define ARM_SMMU_POLL_TIMEOUT_US	100



#define MSI_IOVA_BASE			0x8000000

#define MSI_IOVA_LENGTH			0x100000



static bool disable_bypass;

module_param_named(disable_bypass, disable_bypass, bool, S_IRUGO);

MODULE_PARM_DESC(disable_bypass,
@@ -1883,6 +1886,29 @@ static int arm_smmu_of_xlate(struct device *dev, struct of_phandle_args *args) 
	return iommu_fwspec_add_ids(dev, args->args, 1);

}



static void arm_smmu_get_resv_regions(struct device *dev,

				      struct list_head *head)

{

	struct iommu_resv_region *region;

	int prot = IOMMU_WRITE | IOMMU_NOEXEC | IOMMU_MMIO;



	region = iommu_alloc_resv_region(MSI_IOVA_BASE, MSI_IOVA_LENGTH,

					 prot, IOMMU_RESV_MSI);

	if (!region)

		return;



	list_add_tail(&region->list, head);

}



static void arm_smmu_put_resv_regions(struct device *dev,

				      struct list_head *head)

{

	struct iommu_resv_region *entry, *next;



	list_for_each_entry_safe(entry, next, head, list)

		kfree(entry);

}



static struct iommu_ops arm_smmu_ops = {

	.capable		= arm_smmu_capable,

	.domain_alloc		= arm_smmu_domain_alloc,
@@ -1898,6 +1924,8 @@ static struct iommu_ops arm_smmu_ops = { 
	.domain_get_attr	= arm_smmu_domain_get_attr,

	.domain_set_attr	= arm_smmu_domain_set_attr,

	.of_xlate		= arm_smmu_of_xlate,

	.get_resv_regions	= arm_smmu_get_resv_regions,

	.put_resv_regions	= arm_smmu_put_resv_regions,

	.pgsize_bitmap		= -1UL, /* Restricted during device attach */

};