iommu/arm-smmu: Implement reserved region get/put callbacks (f3ebee80) · Commits · 戴 / test

drivers/iommu/arm-smmu.c

+28 −0

Original line number	Diff line number	Diff line
		@@ -281,6 +281,9 @@ enum arm_smmu_s2cr_privcfg {

		#define FSYNR0_WNR (1 << 4)

		#define MSI_IOVA_BASE 0x8000000
		#define MSI_IOVA_LENGTH 0x100000

		static int force_stage;
		module_param(force_stage, int, S_IRUGO);
		MODULE_PARM_DESC(force_stage,
		@@ -1549,6 +1552,29 @@ static int arm_smmu_of_xlate(struct device dev, struct of_phandle_args args)
		return iommu_fwspec_add_ids(dev, &fwid, 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,
		@@ -1564,6 +1590,8 @@ 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 */
		};