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f1ad5338a4
Commit 951d48855d ("of: Make of_dma_get_range() work on bus nodes")
relaxed the handling of "dma-ranges" for any leaf node on the assumption
that it would still represent a usage error for the property to be
present on a non-bus leaf node. However there turns out to be a fiddly
case where a bus also represents a DMA-capable device in its own right,
such as a PCIe root complex with an integrated DMA engine on its
platform side. In such cases, "dma-ranges" translation is entirely valid
for devices discovered behind the bus, but should not be erroneously
applied to the bus controller device itself which operates in its
parent's address space. Fix this by restoring the previous behaviour for
the specific case where a device is configured via its own OF node,
since it is logical to assume that a device should never represent its
own parent bus.
Reported-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/112e8f3d3e7c054ecf5e12b5ac0aa5596ec00681.1664455433.git.robin.murphy@arm.com
Signed-off-by: Rob Herring <robh@kernel.org>
176 lines
5.6 KiB
C
176 lines
5.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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#ifndef _LINUX_OF_PRIVATE_H
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#define _LINUX_OF_PRIVATE_H
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/*
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* Private symbols used by OF support code
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*
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* Paul Mackerras August 1996.
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* Copyright (C) 1996-2005 Paul Mackerras.
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*/
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#define FDT_ALIGN_SIZE 8
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/**
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* struct alias_prop - Alias property in 'aliases' node
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* @link: List node to link the structure in aliases_lookup list
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* @alias: Alias property name
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* @np: Pointer to device_node that the alias stands for
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* @id: Index value from end of alias name
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* @stem: Alias string without the index
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*
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* The structure represents one alias property of 'aliases' node as
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* an entry in aliases_lookup list.
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*/
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struct alias_prop {
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struct list_head link;
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const char *alias;
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struct device_node *np;
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int id;
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char stem[];
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};
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#if defined(CONFIG_SPARC)
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#define OF_ROOT_NODE_ADDR_CELLS_DEFAULT 2
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#else
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#define OF_ROOT_NODE_ADDR_CELLS_DEFAULT 1
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#endif
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#define OF_ROOT_NODE_SIZE_CELLS_DEFAULT 1
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extern struct mutex of_mutex;
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extern struct list_head aliases_lookup;
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extern struct kset *of_kset;
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#if defined(CONFIG_OF_DYNAMIC)
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extern int of_property_notify(int action, struct device_node *np,
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struct property *prop, struct property *old_prop);
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extern void of_node_release(struct kobject *kobj);
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extern int __of_changeset_apply_entries(struct of_changeset *ocs,
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int *ret_revert);
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extern int __of_changeset_apply_notify(struct of_changeset *ocs);
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extern int __of_changeset_revert_entries(struct of_changeset *ocs,
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int *ret_apply);
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extern int __of_changeset_revert_notify(struct of_changeset *ocs);
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#else /* CONFIG_OF_DYNAMIC */
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static inline int of_property_notify(int action, struct device_node *np,
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struct property *prop, struct property *old_prop)
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{
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return 0;
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}
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#endif /* CONFIG_OF_DYNAMIC */
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#if defined(CONFIG_OF_KOBJ)
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int of_node_is_attached(const struct device_node *node);
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int __of_add_property_sysfs(struct device_node *np, struct property *pp);
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void __of_remove_property_sysfs(struct device_node *np, struct property *prop);
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void __of_update_property_sysfs(struct device_node *np, struct property *newprop,
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struct property *oldprop);
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int __of_attach_node_sysfs(struct device_node *np);
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void __of_detach_node_sysfs(struct device_node *np);
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#else
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static inline int __of_add_property_sysfs(struct device_node *np, struct property *pp)
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{
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return 0;
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}
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static inline void __of_remove_property_sysfs(struct device_node *np, struct property *prop) {}
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static inline void __of_update_property_sysfs(struct device_node *np,
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struct property *newprop, struct property *oldprop) {}
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static inline int __of_attach_node_sysfs(struct device_node *np)
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{
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return 0;
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}
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static inline void __of_detach_node_sysfs(struct device_node *np) {}
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#endif
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#if defined(CONFIG_OF_RESOLVE)
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int of_resolve_phandles(struct device_node *tree);
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#endif
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void __of_phandle_cache_inv_entry(phandle handle);
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#if defined(CONFIG_OF_OVERLAY)
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void of_overlay_mutex_lock(void);
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void of_overlay_mutex_unlock(void);
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#else
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static inline void of_overlay_mutex_lock(void) {};
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static inline void of_overlay_mutex_unlock(void) {};
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#endif
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#if defined(CONFIG_OF_UNITTEST) && defined(CONFIG_OF_OVERLAY)
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extern void __init unittest_unflatten_overlay_base(void);
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#else
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static inline void unittest_unflatten_overlay_base(void) {};
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#endif
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extern void *__unflatten_device_tree(const void *blob,
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struct device_node *dad,
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struct device_node **mynodes,
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void *(*dt_alloc)(u64 size, u64 align),
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bool detached);
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/**
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* General utilities for working with live trees.
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*
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* All functions with two leading underscores operate
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* without taking node references, so you either have to
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* own the devtree lock or work on detached trees only.
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*/
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struct property *__of_prop_dup(const struct property *prop, gfp_t allocflags);
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struct device_node *__of_node_dup(const struct device_node *np,
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const char *full_name);
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struct device_node *__of_find_node_by_path(struct device_node *parent,
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const char *path);
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struct device_node *__of_find_node_by_full_path(struct device_node *node,
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const char *path);
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extern const void *__of_get_property(const struct device_node *np,
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const char *name, int *lenp);
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extern int __of_add_property(struct device_node *np, struct property *prop);
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extern int __of_remove_property(struct device_node *np, struct property *prop);
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extern int __of_update_property(struct device_node *np,
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struct property *newprop, struct property **oldprop);
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extern void __of_detach_node(struct device_node *np);
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extern void __of_sysfs_remove_bin_file(struct device_node *np,
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struct property *prop);
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/* illegal phandle value (set when unresolved) */
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#define OF_PHANDLE_ILLEGAL 0xdeadbeef
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/* iterators for transactions, used for overlays */
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/* forward iterator */
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#define for_each_transaction_entry(_oft, _te) \
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list_for_each_entry(_te, &(_oft)->te_list, node)
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/* reverse iterator */
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#define for_each_transaction_entry_reverse(_oft, _te) \
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list_for_each_entry_reverse(_te, &(_oft)->te_list, node)
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extern int of_bus_n_addr_cells(struct device_node *np);
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extern int of_bus_n_size_cells(struct device_node *np);
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struct bus_dma_region;
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#if defined(CONFIG_OF_ADDRESS) && defined(CONFIG_HAS_DMA)
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int of_dma_get_range(struct device_node *np,
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const struct bus_dma_region **map);
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struct device_node *__of_get_dma_parent(const struct device_node *np);
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#else
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static inline int of_dma_get_range(struct device_node *np,
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const struct bus_dma_region **map)
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{
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return -ENODEV;
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}
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static inline struct device_node *__of_get_dma_parent(const struct device_node *np)
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{
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return of_get_parent(np);
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}
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#endif
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void fdt_init_reserved_mem(void);
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void fdt_reserved_mem_save_node(unsigned long node, const char *uname,
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phys_addr_t base, phys_addr_t size);
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#endif /* _LINUX_OF_PRIVATE_H */
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