[PATCH v5 08/17] iommu/vt-d: Implement reserved region get/put callbacks

[Eric Auger]

This patch registers the [FEE0_0000h - FEF0_000h] 1MB MSI range
as a reserved region. This will allow to report that range
in the iommu-group sysfs.

Signed-off-by: Eric Auger <eric.au...@redhat.com>

---

RFCv2 -> RFCv3:
- use get/put_resv_region callbacks.

RFC v1 -> RFC v2:
- fix intel_iommu_add_reserved_regions name
- use IOAPIC_RANGE_START and IOAPIC_RANGE_END defines
- return if the MSI region is already registered;
---
 drivers/iommu/intel-iommu.c | 50 +++++++++++++++++++++++++++++++++------------
 1 file changed, 37 insertions(+), 13 deletions(-)

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index c66c273..4080207 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -5184,6 +5184,28 @@ static void intel_iommu_remove_device(struct device *dev)
        iommu_device_unlink(iommu->iommu_dev, dev);
 }
 
+static void intel_iommu_get_resv_regions(struct device *device,
+                                        struct list_head *head)
+{
+       struct iommu_resv_region *reg;
+
+       reg = iommu_alloc_resv_region(IOAPIC_RANGE_START,
+                                     IOAPIC_RANGE_END - IOAPIC_RANGE_START + 1,
+                                     0, IOMMU_RESV_NOMAP);
+       if (!reg)
+               return;
+       list_add_tail(&reg->list, head);
+}
+
+static void intel_iommu_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);
+}
+
 #ifdef CONFIG_INTEL_IOMMU_SVM
 int intel_iommu_enable_pasid(struct intel_iommu *iommu, struct intel_svm_dev 
*sdev)
 {
@@ -5293,19 +5315,21 @@ 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,
+       .get_resv_regions       = intel_iommu_get_resv_regions,
+       .put_resv_regions       = intel_iommu_put_resv_regions,
+       .device_group           = pci_device_group,
+       .pgsize_bitmap          = INTEL_IOMMU_PGSIZES,
 };
 
 static void quirk_iommu_g4x_gfx(struct pci_dev *dev)
-- 
1.9.1