Add samsung specific changes

include/linux/io-pgtable-fast.h

@@ -0,0 +1,127 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2018-2021, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#ifndef __LINUX_IO_PGTABLE_FAST_H
+#define __LINUX_IO_PGTABLE_FAST_H
+
+#include <linux/notifier.h>
+#include <linux/io-pgtable.h>
+/*
+ * This ought to be private to io-pgtable-fast, but dma-mapping-fast
+ * currently requires it for a debug usecase.
+ */
+typedef u64 av8l_fast_iopte;
+
+struct io_pgtable_ops;
+struct scatterlist;
+
+struct av8l_fast_io_pgtable {
+	struct io_pgtable	  iop;
+	av8l_fast_iopte		 *pgd;
+	av8l_fast_iopte		 *puds[4];
+	av8l_fast_iopte		 *pmds;
+	struct page		**pages; /* page table memory */
+	int			  nr_pages;
+	dma_addr_t		  base;
+	dma_addr_t		  end;
+};
+
+/* Struct accessors */
+#define iof_pgtable_to_data(x)						\
+	container_of((x), struct av8l_fast_io_pgtable, iop)
+
+#define iof_pgtable_ops_to_pgtable(x)					\
+	container_of((x), struct io_pgtable, ops)
+
+#define iof_pgtable_ops_to_data(x)					\
+	iof_pgtable_to_data(iof_pgtable_ops_to_pgtable(x))
+
+
+#ifdef CONFIG_IOMMU_IO_PGTABLE_FAST
+
+int av8l_fast_map_public(struct io_pgtable_ops *ops, unsigned long iova,
+			 phys_addr_t paddr, size_t size, int prot);
+
+void av8l_fast_unmap_public(struct io_pgtable_ops *ops, unsigned long iova,
+				size_t size);
+
+int av8l_fast_map_sg_public(struct io_pgtable_ops *ops,
+			unsigned long iova, struct scatterlist *sgl,
+			unsigned int nents, int prot, size_t *size);
+
+bool av8l_fast_iova_coherent_public(struct io_pgtable_ops *ops,
+					unsigned long iova);
+
+phys_addr_t av8l_fast_iova_to_phys_public(struct io_pgtable_ops *ops,
+					  unsigned long iova);
+#else
+static inline int
+av8l_fast_map_public(struct io_pgtable_ops *ops, unsigned long iova,
+		     phys_addr_t paddr, size_t size, int prot)
+{
+	return -EINVAL;
+}
+static inline void av8l_fast_unmap_public(struct io_pgtable_ops *ops,
+					  unsigned long iova, size_t size)
+{
+}
+
+static inline int av8l_fast_map_sg_public(struct io_pgtable_ops *ops,
+				unsigned long iova, struct scatterlist *sgl,
+				unsigned int nents, int prot, size_t *size)
+{
+	return 0;
+}
+
+static inline bool av8l_fast_iova_coherent_public(struct io_pgtable_ops *ops,
+						  unsigned long iova)
+{
+	return false;
+}
+static inline phys_addr_t
+av8l_fast_iova_to_phys_public(struct io_pgtable_ops *ops,
+				  unsigned long iova)
+{
+	return 0;
+}
+#endif /* CONFIG_IOMMU_IO_PGTABLE_FAST */
+
+
+/* events for notifiers passed to av8l_register_notify */
+#define MAPPED_OVER_STALE_TLB 1
+
+
+#ifdef CONFIG_IOMMU_IO_PGTABLE_FAST_PROVE_TLB
+/*
+ * Doesn't matter what we use as long as bit 0 is unset.  The reason why we
+ * need a different value at all is that there are certain hardware
+ * platforms with erratum that require that a PTE actually be zero'd out
+ * and not just have its valid bit unset.
+ */
+#define AV8L_FAST_PTE_UNMAPPED_NEED_TLBI 0xa
+
+void av8l_fast_clear_stale_ptes(struct io_pgtable_ops *ops, u64 base, u64 end,
+				bool skip_sync);
+void av8l_register_notify(struct notifier_block *nb);
+
+#else  /* !CONFIG_IOMMU_IO_PGTABLE_FAST_PROVE_TLB */
+
+#define AV8L_FAST_PTE_UNMAPPED_NEED_TLBI 0
+
+static inline void av8l_fast_clear_stale_ptes(struct io_pgtable_ops *ops,
+					      u64 base,
+					      u64 end,
+					      bool skip_sync)
+{
+}
+
+static inline void av8l_register_notify(struct notifier_block *nb)
+{
+}
+
+#endif	/* CONFIG_IOMMU_IO_PGTABLE_FAST_PROVE_TLB */
+
+#endif /* __LINUX_IO_PGTABLE_FAST_H */