linux/drivers/iommu/of_iommu.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * OF helpers for IOMMU
 *
 * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
 */

#include <linux/export.h>
#include <linux/iommu.h>
#include <linux/limits.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_iommu.h>
#include <linux/of_pci.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/fsl/mc.h>

#include "iommu-priv.h"

static int of_iommu_xlate(struct device *dev,
			  struct of_phandle_args *iommu_spec)
{ … }

static int of_iommu_configure_dev_id(struct device_node *master_np,
				     struct device *dev,
				     const u32 *id)
{ … }

static int of_iommu_configure_dev(struct device_node *master_np,
				  struct device *dev)
{ … }

struct of_pci_iommu_alias_info { … };

static int of_pci_iommu_init(struct pci_dev *pdev, u16 alias, void *data)
{ … }

static int of_iommu_configure_device(struct device_node *master_np,
				     struct device *dev, const u32 *id)
{ … }

static void of_pci_check_device_ats(struct device *dev, struct device_node *np)
{ … }

/*
 * Returns:
 *  0 on success, an iommu was configured
 *  -ENODEV if the device does not have any IOMMU
 *  -EPROBEDEFER if probing should be tried again
 *  -errno fatal errors
 */
int of_iommu_configure(struct device *dev, struct device_node *master_np,
		       const u32 *id)
{ … }

static enum iommu_resv_type __maybe_unused
iommu_resv_region_get_type(struct device *dev,
			   struct resource *phys,
			   phys_addr_t start, size_t length)
{ … }

/**
 * of_iommu_get_resv_regions - reserved region driver helper for device tree
 * @dev: device for which to get reserved regions
 * @list: reserved region list
 *
 * IOMMU drivers can use this to implement their .get_resv_regions() callback
 * for memory regions attached to a device tree node. See the reserved-memory
 * device tree bindings on how to use these:
 *
 *   Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt
 */
void of_iommu_get_resv_regions(struct device *dev, struct list_head *list)
{ … }
EXPORT_SYMBOL(…);