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: Eric Auger <eric.auger@redhat.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Reviewed-by: Tomasz Nowicki <tomasz.nowicki@caviumnetworks.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

1 files changed, 28 insertions, 0 deletions

diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index 4d6ec444a9d6..6c4111cb19ff 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -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 */
 };