41a9ada3e6
When movable nodes are enabled, any node containing only hotpluggable memory is made movable at boot time. On x86, hotpluggable memory is discovered by parsing the ACPI SRAT, making corresponding calls to memblock_mark_hotplug(). If we introduce a dt property to describe memory as hotpluggable, configs supporting early fdt may then also do this marking and use movable nodes. Link: http://lkml.kernel.org/r/1479160961-25840-5-git-send-email-arbab@linux.vnet.ibm.com Signed-off-by: Reza Arbab <arbab@linux.vnet.ibm.com> Tested-by: Balbir Singh <bsingharora@gmail.com> Acked-by: Balbir Singh <bsingharora@gmail.com> Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Alistair Popple <apopple@au1.ibm.com> Cc: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Bharata B Rao <bharata@linux.vnet.ibm.com> Cc: Frank Rowand <frowand.list@gmail.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Nathan Fontenot <nfont@linux.vnet.ibm.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Rob Herring <robh+dt@kernel.org> Cc: Stewart Smith <stewart@linux.vnet.ibm.com> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
110 lines
4.1 KiB
C
110 lines
4.1 KiB
C
/*
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* Definitions for working with the Flattened Device Tree data format
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*
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* Copyright 2009 Benjamin Herrenschmidt, IBM Corp
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* benh@kernel.crashing.org
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*/
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#ifndef _LINUX_OF_FDT_H
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#define _LINUX_OF_FDT_H
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/errno.h>
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/* Definitions used by the flattened device tree */
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#define OF_DT_HEADER 0xd00dfeed /* marker */
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#ifndef __ASSEMBLY__
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#if defined(CONFIG_OF_FLATTREE)
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struct device_node;
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/* For scanning an arbitrary device-tree at any time */
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extern char *of_fdt_get_string(const void *blob, u32 offset);
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extern void *of_fdt_get_property(const void *blob,
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unsigned long node,
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const char *name,
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int *size);
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extern int of_fdt_is_compatible(const void *blob,
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unsigned long node,
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const char *compat);
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extern bool of_fdt_is_big_endian(const void *blob,
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unsigned long node);
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extern int of_fdt_match(const void *blob, unsigned long node,
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const char *const *compat);
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extern void *of_fdt_unflatten_tree(const unsigned long *blob,
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struct device_node *dad,
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struct device_node **mynodes);
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/* TBD: Temporary export of fdt globals - remove when code fully merged */
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extern int __initdata dt_root_addr_cells;
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extern int __initdata dt_root_size_cells;
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extern void *initial_boot_params;
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extern char __dtb_start[];
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extern char __dtb_end[];
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/* For scanning the flat device-tree at boot time */
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extern int of_scan_flat_dt(int (*it)(unsigned long node, const char *uname,
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int depth, void *data),
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void *data);
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extern int of_get_flat_dt_subnode_by_name(unsigned long node,
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const char *uname);
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extern const void *of_get_flat_dt_prop(unsigned long node, const char *name,
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int *size);
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extern int of_flat_dt_is_compatible(unsigned long node, const char *name);
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extern int of_flat_dt_match(unsigned long node, const char *const *matches);
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extern unsigned long of_get_flat_dt_root(void);
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extern int of_get_flat_dt_size(void);
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extern int early_init_dt_scan_chosen(unsigned long node, const char *uname,
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int depth, void *data);
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extern int early_init_dt_scan_memory(unsigned long node, const char *uname,
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int depth, void *data);
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extern int early_init_dt_scan_chosen_stdout(void);
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extern void early_init_fdt_scan_reserved_mem(void);
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extern void early_init_fdt_reserve_self(void);
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extern void early_init_dt_add_memory_arch(u64 base, u64 size);
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extern int early_init_dt_mark_hotplug_memory_arch(u64 base, u64 size);
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extern int early_init_dt_reserve_memory_arch(phys_addr_t base, phys_addr_t size,
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bool no_map);
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extern void * early_init_dt_alloc_memory_arch(u64 size, u64 align);
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extern u64 dt_mem_next_cell(int s, const __be32 **cellp);
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/* Early flat tree scan hooks */
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extern int early_init_dt_scan_root(unsigned long node, const char *uname,
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int depth, void *data);
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extern bool early_init_dt_scan(void *params);
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extern bool early_init_dt_verify(void *params);
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extern void early_init_dt_scan_nodes(void);
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extern const char *of_flat_dt_get_machine_name(void);
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extern const void *of_flat_dt_match_machine(const void *default_match,
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const void * (*get_next_compat)(const char * const**));
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/* Other Prototypes */
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extern void unflatten_device_tree(void);
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extern void unflatten_and_copy_device_tree(void);
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extern void early_init_devtree(void *);
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extern void early_get_first_memblock_info(void *, phys_addr_t *);
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extern u64 of_flat_dt_translate_address(unsigned long node);
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extern void of_fdt_limit_memory(int limit);
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#else /* CONFIG_OF_FLATTREE */
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static inline int early_init_dt_scan_chosen_stdout(void) { return -ENODEV; }
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static inline void early_init_fdt_scan_reserved_mem(void) {}
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static inline void early_init_fdt_reserve_self(void) {}
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static inline const char *of_flat_dt_get_machine_name(void) { return NULL; }
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static inline void unflatten_device_tree(void) {}
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static inline void unflatten_and_copy_device_tree(void) {}
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#endif /* CONFIG_OF_FLATTREE */
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#endif /* __ASSEMBLY__ */
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#endif /* _LINUX_OF_FDT_H */
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