Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / include / linux / iova.h

diff --git a/kernel/include/linux/iova.h b/kernel/include/linux/iova.h
new file mode 100644 (file)
index 0000000..3920a19
--- /dev/null
+++ b/kernel/include/linux/iova.h
@@ -0,0 +1,91 @@
+/*
+ * Copyright (c) 2006, Intel Corporation.
+ *
+ * This file is released under the GPLv2.
+ *
+ * Copyright (C) 2006-2008 Intel Corporation
+ * Author: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
+ *
+ */
+
+#ifndef _IOVA_H_
+#define _IOVA_H_
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/rbtree.h>
+#include <linux/dma-mapping.h>
+
+/* iova structure */
+struct iova {
+       struct rb_node  node;
+       unsigned long   pfn_hi; /* IOMMU dish out addr hi */
+       unsigned long   pfn_lo; /* IOMMU dish out addr lo */
+};
+
+/* holds all the iova translations for a domain */
+struct iova_domain {
+       spinlock_t      iova_rbtree_lock; /* Lock to protect update of rbtree */
+       struct rb_root  rbroot;         /* iova domain rbtree root */
+       struct rb_node  *cached32_node; /* Save last alloced node */
+       unsigned long   granule;        /* pfn granularity for this domain */
+       unsigned long   start_pfn;      /* Lower limit for this domain */
+       unsigned long   dma_32bit_pfn;
+};
+
+static inline unsigned long iova_size(struct iova *iova)
+{
+       return iova->pfn_hi - iova->pfn_lo + 1;
+}
+
+static inline unsigned long iova_shift(struct iova_domain *iovad)
+{
+       return __ffs(iovad->granule);
+}
+
+static inline unsigned long iova_mask(struct iova_domain *iovad)
+{
+       return iovad->granule - 1;
+}
+
+static inline size_t iova_offset(struct iova_domain *iovad, dma_addr_t iova)
+{
+       return iova & iova_mask(iovad);
+}
+
+static inline size_t iova_align(struct iova_domain *iovad, size_t size)
+{
+       return ALIGN(size, iovad->granule);
+}
+
+static inline dma_addr_t iova_dma_addr(struct iova_domain *iovad, struct iova *iova)
+{
+       return (dma_addr_t)iova->pfn_lo << iova_shift(iovad);
+}
+
+static inline unsigned long iova_pfn(struct iova_domain *iovad, dma_addr_t iova)
+{
+       return iova >> iova_shift(iovad);
+}
+
+int iommu_iova_cache_init(void);
+void iommu_iova_cache_destroy(void);
+
+struct iova *alloc_iova_mem(void);
+void free_iova_mem(struct iova *iova);
+void free_iova(struct iova_domain *iovad, unsigned long pfn);
+void __free_iova(struct iova_domain *iovad, struct iova *iova);
+struct iova *alloc_iova(struct iova_domain *iovad, unsigned long size,
+       unsigned long limit_pfn,
+       bool size_aligned);
+struct iova *reserve_iova(struct iova_domain *iovad, unsigned long pfn_lo,
+       unsigned long pfn_hi);
+void copy_reserved_iova(struct iova_domain *from, struct iova_domain *to);
+void init_iova_domain(struct iova_domain *iovad, unsigned long granule,
+       unsigned long start_pfn, unsigned long pfn_32bit);
+struct iova *find_iova(struct iova_domain *iovad, unsigned long pfn);
+void put_iova_domain(struct iova_domain *iovad);
+struct iova *split_and_remove_iova(struct iova_domain *iovad,
+       struct iova *iova, unsigned long pfn_lo, unsigned long pfn_hi);
+
+#endif