1 files changed, 127 insertions, 0 deletions
diff --git a/drivers/gpu/drm/etnaviv/etnaviv_mmu.h b/drivers/gpu/drm/etnaviv/etnaviv_mmu.h
new file mode 100644
index 000000000..c01a147f0
--- /dev/null
+++ b/drivers/gpu/drm/etnaviv/etnaviv_mmu.h
@@ -0,0 +1,127 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2015-2018 Etnaviv Project
+ */
+
+#ifndef __ETNAVIV_MMU_H__
+#define __ETNAVIV_MMU_H__
+
+#define ETNAVIV_PROT_READ	(1 << 0)
+#define ETNAVIV_PROT_WRITE	(1 << 1)
+
+enum etnaviv_iommu_version {
+	ETNAVIV_IOMMU_V1 = 0,
+	ETNAVIV_IOMMU_V2,
+};
+
+struct etnaviv_gpu;
+struct etnaviv_vram_mapping;
+struct etnaviv_iommu_global;
+struct etnaviv_iommu_context;
+
+struct etnaviv_iommu_ops {
+	struct etnaviv_iommu_context *(*init)(struct etnaviv_iommu_global *);
+	void (*free)(struct etnaviv_iommu_context *);
+	int (*map)(struct etnaviv_iommu_context *context, unsigned long iova,
+		   phys_addr_t paddr, size_t size, int prot);
+	size_t (*unmap)(struct etnaviv_iommu_context *context, unsigned long iova,
+			size_t size);
+	size_t (*dump_size)(struct etnaviv_iommu_context *);
+	void (*dump)(struct etnaviv_iommu_context *, void *);
+	void (*restore)(struct etnaviv_gpu *, struct etnaviv_iommu_context *);
+};
+
+extern const struct etnaviv_iommu_ops etnaviv_iommuv1_ops;
+extern const struct etnaviv_iommu_ops etnaviv_iommuv2_ops;
+
+#define ETNAVIV_PTA_SIZE	SZ_4K
+#define ETNAVIV_PTA_ENTRIES	(ETNAVIV_PTA_SIZE / sizeof(u64))
+
+struct etnaviv_iommu_global {
+	struct device *dev;
+	enum etnaviv_iommu_version version;
+	const struct etnaviv_iommu_ops *ops;
+	unsigned int use;
+	struct mutex lock;
+
+	void *bad_page_cpu;
+	dma_addr_t bad_page_dma;
+
+	u32 memory_base;
+
+	/*
+	 * This union holds members needed by either MMUv1 or MMUv2, which
+	 * can not exist at the same time.
+	 */
+	union {
+		struct {
+			struct etnaviv_iommu_context *shared_context;
+		} v1;
+		struct {
+			/* P(age) T(able) A(rray) */
+			u64 *pta_cpu;
+			dma_addr_t pta_dma;
+			struct spinlock pta_lock;
+			DECLARE_BITMAP(pta_alloc, ETNAVIV_PTA_ENTRIES);
+		} v2;
+	};
+};
+
+struct etnaviv_iommu_context {
+	struct kref refcount;
+	struct etnaviv_iommu_global *global;
+
+	/* memory manager for GPU address area */
+	struct mutex lock;
+	struct list_head mappings;
+	struct drm_mm mm;
+	unsigned int flush_seq;
+
+	/* Not part of the context, but needs to have the same lifetime */
+	struct etnaviv_vram_mapping cmdbuf_mapping;
+};
+
+int etnaviv_iommu_global_init(struct etnaviv_gpu *gpu);
+void etnaviv_iommu_global_fini(struct etnaviv_gpu *gpu);
+
+struct etnaviv_gem_object;
+
+int etnaviv_iommu_map_gem(struct etnaviv_iommu_context *context,
+	struct etnaviv_gem_object *etnaviv_obj, u32 memory_base,
+	struct etnaviv_vram_mapping *mapping, u64 va);
+void etnaviv_iommu_unmap_gem(struct etnaviv_iommu_context *context,
+	struct etnaviv_vram_mapping *mapping);
+void etnaviv_iommu_reap_mapping(struct etnaviv_vram_mapping *mapping);
+
+int etnaviv_iommu_get_suballoc_va(struct etnaviv_iommu_context *ctx,
+				  struct etnaviv_vram_mapping *mapping,
+				  u32 memory_base, dma_addr_t paddr,
+				  size_t size);
+void etnaviv_iommu_put_suballoc_va(struct etnaviv_iommu_context *ctx,
+				   struct etnaviv_vram_mapping *mapping);
+
+size_t etnaviv_iommu_dump_size(struct etnaviv_iommu_context *ctx);
+void etnaviv_iommu_dump(struct etnaviv_iommu_context *ctx, void *buf);
+
+struct etnaviv_iommu_context *
+etnaviv_iommu_context_init(struct etnaviv_iommu_global *global,
+			   struct etnaviv_cmdbuf_suballoc *suballoc);
+static inline struct etnaviv_iommu_context *
+etnaviv_iommu_context_get(struct etnaviv_iommu_context *ctx)
+{
+	kref_get(&ctx->refcount);
+	return ctx;
+}
+void etnaviv_iommu_context_put(struct etnaviv_iommu_context *ctx);
+void etnaviv_iommu_restore(struct etnaviv_gpu *gpu,
+			   struct etnaviv_iommu_context *ctx);
+
+struct etnaviv_iommu_context *
+etnaviv_iommuv1_context_alloc(struct etnaviv_iommu_global *global);
+struct etnaviv_iommu_context *
+etnaviv_iommuv2_context_alloc(struct etnaviv_iommu_global *global);
+
+u32 etnaviv_iommuv2_get_mtlb_addr(struct etnaviv_iommu_context *context);
+unsigned short etnaviv_iommuv2_get_pta_id(struct etnaviv_iommu_context *context);
+
+#endif /* __ETNAVIV_MMU_H__ */