Implement the add_reserved_regions callback by registering the [FEE0_0000h - FEF0_000h] 1MB range as a reserved region (MSI address space).
Signed-off-by: Eric Auger <eric.au...@redhat.com> --- drivers/iommu/intel-iommu.c | 48 +++++++++++++++++++++++++++++++++------------ 1 file changed, 35 insertions(+), 13 deletions(-) diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index a4407ea..fb64418 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -5173,6 +5173,27 @@ static void intel_iommu_remove_device(struct device *dev) iommu_device_unlink(iommu->iommu_dev, dev); } +static int intel_add_reserved_regions(struct iommu_domain *domain, + struct device *device) +{ + struct iommu_reserved_region *region; + const dma_addr_t msi_base = 0xfee00000; + const size_t msi_length = 0x00100000; + + iommu_reserved_region_for_each(region, domain) { + if (region->start == msi_base && region->length == msi_length) + continue; + } + region = kzalloc(sizeof(*region), GFP_KERNEL); + if (!region) + return -ENOMEM; + + region->start = msi_base; + region->length = msi_length; + list_add_tail(®ion->list, &domain->reserved_regions); + return 0; +} + #ifdef CONFIG_INTEL_IOMMU_SVM int intel_iommu_enable_pasid(struct intel_iommu *iommu, struct intel_svm_dev *sdev) { @@ -5282,19 +5303,20 @@ struct intel_iommu *intel_svm_device_to_iommu(struct device *dev) #endif /* CONFIG_INTEL_IOMMU_SVM */ static const struct iommu_ops intel_iommu_ops = { - .capable = intel_iommu_capable, - .domain_alloc = intel_iommu_domain_alloc, - .domain_free = intel_iommu_domain_free, - .attach_dev = intel_iommu_attach_device, - .detach_dev = intel_iommu_detach_device, - .map = intel_iommu_map, - .unmap = intel_iommu_unmap, - .map_sg = default_iommu_map_sg, - .iova_to_phys = intel_iommu_iova_to_phys, - .add_device = intel_iommu_add_device, - .remove_device = intel_iommu_remove_device, - .device_group = pci_device_group, - .pgsize_bitmap = INTEL_IOMMU_PGSIZES, + .capable = intel_iommu_capable, + .domain_alloc = intel_iommu_domain_alloc, + .domain_free = intel_iommu_domain_free, + .attach_dev = intel_iommu_attach_device, + .detach_dev = intel_iommu_detach_device, + .map = intel_iommu_map, + .unmap = intel_iommu_unmap, + .map_sg = default_iommu_map_sg, + .iova_to_phys = intel_iommu_iova_to_phys, + .add_device = intel_iommu_add_device, + .remove_device = intel_iommu_remove_device, + .add_reserved_regions = intel_iommu_add_reserved_regions, + .device_group = pci_device_group, + .pgsize_bitmap = INTEL_IOMMU_PGSIZES, }; static void quirk_iommu_g4x_gfx(struct pci_dev *dev) -- 1.9.1