#define FEATURE_PC (1ULL<<9)
#define FEATURE_GAM_VAPIC (1ULL<<21)
#define FEATURE_EPHSUP (1ULL<<50)
+#define FEATURE_SNP (1ULL<<63)
#define FEATURE_PASID_SHIFT 32
#define FEATURE_PASID_MASK (0x1fULL << FEATURE_PASID_SHIFT)
&entry, sizeof(entry));
}
+static void iommu_set_cwwb_range(struct amd_iommu *iommu)
+{
+ u64 start = iommu_virt_to_phys((void *)iommu->cmd_sem);
+ u64 entry = start & PM_ADDR_MASK;
+
+ if (!iommu_feature(iommu, FEATURE_SNP))
+ return;
+
+ /* Note:
+ * Re-purpose Exclusion base/limit registers for Completion wait
+ * write-back base/limit.
+ */
+ memcpy_toio(iommu->mmio_base + MMIO_EXCL_BASE_OFFSET,
+ &entry, sizeof(entry));
+
+ /* Note:
+ * Default to 4 Kbytes, which can be specified by setting base
+ * address equal to the limit address.
+ */
+ memcpy_toio(iommu->mmio_base + MMIO_EXCL_LIMIT_OFFSET,
+ &entry, sizeof(entry));
+}
+
/* Programs the physical address of the device table into the IOMMU hardware */
static void iommu_set_device_table(struct amd_iommu *iommu)
{
ret = iommu_init_pci(iommu);
if (ret)
break;
+
+ /* Need to setup range after PCI init */
+ iommu_set_cwwb_range(iommu);
}
/*