iommu/vt-d: Fix 64-bit accesses to 32-bit DMAR_GSTS_REG

[pandora-kernel.git] / drivers / iommu / intr_remapping.c

diff --git a/drivers/iommu/intr_remapping.c b/drivers/iommu/intr_remapping.c
index 6777ca0..cc2c7b4 100644 (file)
--- a/drivers/iommu/intr_remapping.c
+++ b/drivers/iommu/intr_remapping.c
@@ -496,7 +496,7 @@ static void iommu_disable_intr_remapping(struct intel_iommu *iommu)
 
        raw_spin_lock_irqsave(&iommu->register_lock, flags);
 
-       sts = dmar_readq(iommu->reg + DMAR_GSTS_REG);
+       sts = readl(iommu->reg + DMAR_GSTS_REG);
        if (!(sts & DMA_GSTS_IRES))
                goto end;
 
@@ -752,6 +752,7 @@ int __init parse_ioapics_under_ir(void)
 {
        struct dmar_drhd_unit *drhd;
        int ir_supported = 0;
+       int ioapic_idx;
 
        for_each_drhd_unit(drhd) {
                struct intel_iommu *iommu = drhd->iommu;
@@ -764,13 +765,20 @@ int __init parse_ioapics_under_ir(void)
                }
        }
 
-       if (ir_supported && ir_ioapic_num != nr_ioapics) {
-               printk(KERN_WARNING
-                      "Not all IO-APIC's listed under remapping hardware\n");
-               return -1;
+       if (!ir_supported)
+               return 0;
+
+       for (ioapic_idx = 0; ioapic_idx < nr_ioapics; ioapic_idx++) {
+               int ioapic_id = mpc_ioapic_id(ioapic_idx);
+               if (!map_ioapic_to_ir(ioapic_id)) {
+                       pr_err(FW_BUG "ioapic %d has no mapping iommu, "
+                              "interrupt remapping will be disabled\n",
+                              ioapic_id);
+                       return -1;
+               }
        }
 
-       return ir_supported;
+       return 1;
 }
 
 int __init ir_dev_scope_init(void)