Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / iommu / io-pgtable.h

diff --git a/kernel/drivers/iommu/io-pgtable.h b/kernel/drivers/iommu/io-pgtable.h
new file mode 100644 (file)
index 0000000..10e32f6
--- /dev/null
+++ b/kernel/drivers/iommu/io-pgtable.h
@@ -0,0 +1,143 @@
+#ifndef __IO_PGTABLE_H
+#define __IO_PGTABLE_H
+
+/*
+ * Public API for use by IOMMU drivers
+ */
+enum io_pgtable_fmt {
+       ARM_32_LPAE_S1,
+       ARM_32_LPAE_S2,
+       ARM_64_LPAE_S1,
+       ARM_64_LPAE_S2,
+       IO_PGTABLE_NUM_FMTS,
+};
+
+/**
+ * struct iommu_gather_ops - IOMMU callbacks for TLB and page table management.
+ *
+ * @tlb_flush_all: Synchronously invalidate the entire TLB context.
+ * @tlb_add_flush: Queue up a TLB invalidation for a virtual address range.
+ * @tlb_sync:      Ensure any queue TLB invalidation has taken effect.
+ * @flush_pgtable: Ensure page table updates are visible to the IOMMU.
+ *
+ * Note that these can all be called in atomic context and must therefore
+ * not block.
+ */
+struct iommu_gather_ops {
+       void (*tlb_flush_all)(void *cookie);
+       void (*tlb_add_flush)(unsigned long iova, size_t size, bool leaf,
+                             void *cookie);
+       void (*tlb_sync)(void *cookie);
+       void (*flush_pgtable)(void *ptr, size_t size, void *cookie);
+};
+
+/**
+ * struct io_pgtable_cfg - Configuration data for a set of page tables.
+ *
+ * @quirks:        A bitmap of hardware quirks that require some special
+ *                 action by the low-level page table allocator.
+ * @pgsize_bitmap: A bitmap of page sizes supported by this set of page
+ *                 tables.
+ * @ias:           Input address (iova) size, in bits.
+ * @oas:           Output address (paddr) size, in bits.
+ * @tlb:           TLB management callbacks for this set of tables.
+ */
+struct io_pgtable_cfg {
+       #define IO_PGTABLE_QUIRK_ARM_NS (1 << 0)        /* Set NS bit in PTEs */
+       int                             quirks;
+       unsigned long                   pgsize_bitmap;
+       unsigned int                    ias;
+       unsigned int                    oas;
+       const struct iommu_gather_ops   *tlb;
+
+       /* Low-level data specific to the table format */
+       union {
+               struct {
+                       u64     ttbr[2];
+                       u64     tcr;
+                       u64     mair[2];
+               } arm_lpae_s1_cfg;
+
+               struct {
+                       u64     vttbr;
+                       u64     vtcr;
+               } arm_lpae_s2_cfg;
+       };
+};
+
+/**
+ * struct io_pgtable_ops - Page table manipulation API for IOMMU drivers.
+ *
+ * @map:          Map a physically contiguous memory region.
+ * @unmap:        Unmap a physically contiguous memory region.
+ * @iova_to_phys: Translate iova to physical address.
+ *
+ * These functions map directly onto the iommu_ops member functions with
+ * the same names.
+ */
+struct io_pgtable_ops {
+       int (*map)(struct io_pgtable_ops *ops, unsigned long iova,
+                  phys_addr_t paddr, size_t size, int prot);
+       int (*unmap)(struct io_pgtable_ops *ops, unsigned long iova,
+                    size_t size);
+       phys_addr_t (*iova_to_phys)(struct io_pgtable_ops *ops,
+                                   unsigned long iova);
+};
+
+/**
+ * alloc_io_pgtable_ops() - Allocate a page table allocator for use by an IOMMU.
+ *
+ * @fmt:    The page table format.
+ * @cfg:    The page table configuration. This will be modified to represent
+ *          the configuration actually provided by the allocator (e.g. the
+ *          pgsize_bitmap may be restricted).
+ * @cookie: An opaque token provided by the IOMMU driver and passed back to
+ *          the callback routines in cfg->tlb.
+ */
+struct io_pgtable_ops *alloc_io_pgtable_ops(enum io_pgtable_fmt fmt,
+                                           struct io_pgtable_cfg *cfg,
+                                           void *cookie);
+
+/**
+ * free_io_pgtable_ops() - Free an io_pgtable_ops structure. The caller
+ *                         *must* ensure that the page table is no longer
+ *                         live, but the TLB can be dirty.
+ *
+ * @ops: The ops returned from alloc_io_pgtable_ops.
+ */
+void free_io_pgtable_ops(struct io_pgtable_ops *ops);
+
+
+/*
+ * Internal structures for page table allocator implementations.
+ */
+
+/**
+ * struct io_pgtable - Internal structure describing a set of page tables.
+ *
+ * @fmt:    The page table format.
+ * @cookie: An opaque token provided by the IOMMU driver and passed back to
+ *          any callback routines.
+ * @cfg:    A copy of the page table configuration.
+ * @ops:    The page table operations in use for this set of page tables.
+ */
+struct io_pgtable {
+       enum io_pgtable_fmt     fmt;
+       void                    *cookie;
+       struct io_pgtable_cfg   cfg;
+       struct io_pgtable_ops   ops;
+};
+
+/**
+ * struct io_pgtable_init_fns - Alloc/free a set of page tables for a
+ *                              particular format.
+ *
+ * @alloc: Allocate a set of page tables described by cfg.
+ * @free:  Free the page tables associated with iop.
+ */
+struct io_pgtable_init_fns {
+       struct io_pgtable *(*alloc)(struct io_pgtable_cfg *cfg, void *cookie);
+       void (*free)(struct io_pgtable *iop);
+};
+
+#endif /* __IO_PGTABLE_H */