include/linux/io-pgtable-fast.h

/* Copyright (c) 2017, The Linux Foundation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#ifndef __LINUX_IO_PGTABLE_FAST_H
#define __LINUX_IO_PGTABLE_FAST_H

#include <linux/notifier.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;

#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);

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 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 start, 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 start,
					      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 */