obj-$(CONFIG_ARM_SMMU) += arm-smmu.o
obj-$(CONFIG_ARM_SMMU_V3) += arm-smmu-v3.o
obj-$(CONFIG_DMAR_TABLE) += dmar.o
-obj-$(CONFIG_INTEL_IOMMU) += intel-iommu.o
+obj-$(CONFIG_INTEL_IOMMU) += intel-iommu.o intel-pasid.o
obj-$(CONFIG_INTEL_IOMMU_SVM) += intel-svm.o
obj-$(CONFIG_IPMMU_VMSA) += ipmmu-vmsa.o
obj-$(CONFIG_IRQ_REMAP) += intel_irq_remapping.o irq_remapping.o
#include <asm/iommu.h>
#include "irq_remapping.h"
+#include "intel-pasid.h"
#define ROOT_SIZE VTD_PAGE_SIZE
#define CONTEXT_SIZE VTD_PAGE_SIZE
}
for_each_active_iommu(iommu, drhd) {
+ /*
+ * Find the max pasid size of all IOMMU's in the system.
+ * We need to ensure the system pasid table is no bigger
+ * than the smallest supported.
+ */
+ if (pasid_enabled(iommu)) {
+ u32 temp = 2 << ecap_pss(iommu->ecap);
+
+ intel_pasid_max_id = min_t(u32, temp,
+ intel_pasid_max_id);
+ }
+
g_iommus[iommu->seq_id] = iommu;
intel_iommu_init_qi(iommu);
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/**
+ * intel-pasid.c - PASID idr, table and entry manipulation
+ *
+ * Copyright (C) 2018 Intel Corporation
+ *
+ * Author: Lu Baolu <baolu.lu@linux.intel.com>
+ */
+
+#define pr_fmt(fmt) "DMAR: " fmt
+
+#include <linux/dmar.h>
+#include <linux/intel-iommu.h>
+#include <linux/iommu.h>
+#include <linux/memory.h>
+#include <linux/spinlock.h>
+
+#include "intel-pasid.h"
+
+/*
+ * Intel IOMMU system wide PASID name space:
+ */
+static DEFINE_SPINLOCK(pasid_lock);
+u32 intel_pasid_max_id = PASID_MAX;
+static DEFINE_IDR(pasid_idr);
+
+int intel_pasid_alloc_id(void *ptr, int start, int end, gfp_t gfp)
+{
+ int ret, min, max;
+
+ min = max_t(int, start, PASID_MIN);
+ max = min_t(int, end, intel_pasid_max_id);
+
+ WARN_ON(in_interrupt());
+ idr_preload(gfp);
+ spin_lock(&pasid_lock);
+ ret = idr_alloc(&pasid_idr, ptr, min, max, GFP_ATOMIC);
+ spin_unlock(&pasid_lock);
+ idr_preload_end();
+
+ return ret;
+}
+
+void intel_pasid_free_id(int pasid)
+{
+ spin_lock(&pasid_lock);
+ idr_remove(&pasid_idr, pasid);
+ spin_unlock(&pasid_lock);
+}
+
+void *intel_pasid_lookup_id(int pasid)
+{
+ void *p;
+
+ spin_lock(&pasid_lock);
+ p = idr_find(&pasid_idr, pasid);
+ spin_unlock(&pasid_lock);
+
+ return p;
+}
--- /dev/null
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * intel-pasid.h - PASID idr, table and entry header
+ *
+ * Copyright (C) 2018 Intel Corporation
+ *
+ * Author: Lu Baolu <baolu.lu@linux.intel.com>
+ */
+
+#ifndef __INTEL_PASID_H
+#define __INTEL_PASID_H
+
+#define PASID_MIN 0x1
+#define PASID_MAX 0x100000
+
+extern u32 intel_pasid_max_id;
+int intel_pasid_alloc_id(void *ptr, int start, int end, gfp_t gfp);
+void intel_pasid_free_id(int pasid);
+void *intel_pasid_lookup_id(int pasid);
+
+#endif /* __INTEL_PASID_H */