mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-31 16:38:12 +00:00
27c196c7b7
Support for requesting muxed memory region is implemented but not currently callable as a macro. Add the request muxed memory region macro. MMIO memory accesses can be synchronized using request_mem_region() which is already available. This call will return failure if the resource is busy. The 'muxed' version of this macro will handle a busy resource by using a wait queue to retry until the resource is available. Signed-off-by: Terry Bowman <terry.bowman@amd.com> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Wolfram Sang <wsa@kernel.org>
343 lines
12 KiB
C
343 lines
12 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* ioport.h Definitions of routines for detecting, reserving and
|
|
* allocating system resources.
|
|
*
|
|
* Authors: Linus Torvalds
|
|
*/
|
|
|
|
#ifndef _LINUX_IOPORT_H
|
|
#define _LINUX_IOPORT_H
|
|
|
|
#ifndef __ASSEMBLY__
|
|
#include <linux/bits.h>
|
|
#include <linux/compiler.h>
|
|
#include <linux/minmax.h>
|
|
#include <linux/types.h>
|
|
/*
|
|
* Resources are tree-like, allowing
|
|
* nesting etc..
|
|
*/
|
|
struct resource {
|
|
resource_size_t start;
|
|
resource_size_t end;
|
|
const char *name;
|
|
unsigned long flags;
|
|
unsigned long desc;
|
|
struct resource *parent, *sibling, *child;
|
|
};
|
|
|
|
/*
|
|
* IO resources have these defined flags.
|
|
*
|
|
* PCI devices expose these flags to userspace in the "resource" sysfs file,
|
|
* so don't move them.
|
|
*/
|
|
#define IORESOURCE_BITS 0x000000ff /* Bus-specific bits */
|
|
|
|
#define IORESOURCE_TYPE_BITS 0x00001f00 /* Resource type */
|
|
#define IORESOURCE_IO 0x00000100 /* PCI/ISA I/O ports */
|
|
#define IORESOURCE_MEM 0x00000200
|
|
#define IORESOURCE_REG 0x00000300 /* Register offsets */
|
|
#define IORESOURCE_IRQ 0x00000400
|
|
#define IORESOURCE_DMA 0x00000800
|
|
#define IORESOURCE_BUS 0x00001000
|
|
|
|
#define IORESOURCE_PREFETCH 0x00002000 /* No side effects */
|
|
#define IORESOURCE_READONLY 0x00004000
|
|
#define IORESOURCE_CACHEABLE 0x00008000
|
|
#define IORESOURCE_RANGELENGTH 0x00010000
|
|
#define IORESOURCE_SHADOWABLE 0x00020000
|
|
|
|
#define IORESOURCE_SIZEALIGN 0x00040000 /* size indicates alignment */
|
|
#define IORESOURCE_STARTALIGN 0x00080000 /* start field is alignment */
|
|
|
|
#define IORESOURCE_MEM_64 0x00100000
|
|
#define IORESOURCE_WINDOW 0x00200000 /* forwarded by bridge */
|
|
#define IORESOURCE_MUXED 0x00400000 /* Resource is software muxed */
|
|
|
|
#define IORESOURCE_EXT_TYPE_BITS 0x01000000 /* Resource extended types */
|
|
#define IORESOURCE_SYSRAM 0x01000000 /* System RAM (modifier) */
|
|
|
|
/* IORESOURCE_SYSRAM specific bits. */
|
|
#define IORESOURCE_SYSRAM_DRIVER_MANAGED 0x02000000 /* Always detected via a driver. */
|
|
#define IORESOURCE_SYSRAM_MERGEABLE 0x04000000 /* Resource can be merged. */
|
|
|
|
#define IORESOURCE_EXCLUSIVE 0x08000000 /* Userland may not map this resource */
|
|
|
|
#define IORESOURCE_DISABLED 0x10000000
|
|
#define IORESOURCE_UNSET 0x20000000 /* No address assigned yet */
|
|
#define IORESOURCE_AUTO 0x40000000
|
|
#define IORESOURCE_BUSY 0x80000000 /* Driver has marked this resource busy */
|
|
|
|
/* I/O resource extended types */
|
|
#define IORESOURCE_SYSTEM_RAM (IORESOURCE_MEM|IORESOURCE_SYSRAM)
|
|
|
|
/* PnP IRQ specific bits (IORESOURCE_BITS) */
|
|
#define IORESOURCE_IRQ_HIGHEDGE (1<<0)
|
|
#define IORESOURCE_IRQ_LOWEDGE (1<<1)
|
|
#define IORESOURCE_IRQ_HIGHLEVEL (1<<2)
|
|
#define IORESOURCE_IRQ_LOWLEVEL (1<<3)
|
|
#define IORESOURCE_IRQ_SHAREABLE (1<<4)
|
|
#define IORESOURCE_IRQ_OPTIONAL (1<<5)
|
|
|
|
/* PnP DMA specific bits (IORESOURCE_BITS) */
|
|
#define IORESOURCE_DMA_TYPE_MASK (3<<0)
|
|
#define IORESOURCE_DMA_8BIT (0<<0)
|
|
#define IORESOURCE_DMA_8AND16BIT (1<<0)
|
|
#define IORESOURCE_DMA_16BIT (2<<0)
|
|
|
|
#define IORESOURCE_DMA_MASTER (1<<2)
|
|
#define IORESOURCE_DMA_BYTE (1<<3)
|
|
#define IORESOURCE_DMA_WORD (1<<4)
|
|
|
|
#define IORESOURCE_DMA_SPEED_MASK (3<<6)
|
|
#define IORESOURCE_DMA_COMPATIBLE (0<<6)
|
|
#define IORESOURCE_DMA_TYPEA (1<<6)
|
|
#define IORESOURCE_DMA_TYPEB (2<<6)
|
|
#define IORESOURCE_DMA_TYPEF (3<<6)
|
|
|
|
/* PnP memory I/O specific bits (IORESOURCE_BITS) */
|
|
#define IORESOURCE_MEM_WRITEABLE (1<<0) /* dup: IORESOURCE_READONLY */
|
|
#define IORESOURCE_MEM_CACHEABLE (1<<1) /* dup: IORESOURCE_CACHEABLE */
|
|
#define IORESOURCE_MEM_RANGELENGTH (1<<2) /* dup: IORESOURCE_RANGELENGTH */
|
|
#define IORESOURCE_MEM_TYPE_MASK (3<<3)
|
|
#define IORESOURCE_MEM_8BIT (0<<3)
|
|
#define IORESOURCE_MEM_16BIT (1<<3)
|
|
#define IORESOURCE_MEM_8AND16BIT (2<<3)
|
|
#define IORESOURCE_MEM_32BIT (3<<3)
|
|
#define IORESOURCE_MEM_SHADOWABLE (1<<5) /* dup: IORESOURCE_SHADOWABLE */
|
|
#define IORESOURCE_MEM_EXPANSIONROM (1<<6)
|
|
#define IORESOURCE_MEM_NONPOSTED (1<<7)
|
|
|
|
/* PnP I/O specific bits (IORESOURCE_BITS) */
|
|
#define IORESOURCE_IO_16BIT_ADDR (1<<0)
|
|
#define IORESOURCE_IO_FIXED (1<<1)
|
|
#define IORESOURCE_IO_SPARSE (1<<2)
|
|
|
|
/* PCI ROM control bits (IORESOURCE_BITS) */
|
|
#define IORESOURCE_ROM_ENABLE (1<<0) /* ROM is enabled, same as PCI_ROM_ADDRESS_ENABLE */
|
|
#define IORESOURCE_ROM_SHADOW (1<<1) /* Use RAM image, not ROM BAR */
|
|
|
|
/* PCI control bits. Shares IORESOURCE_BITS with above PCI ROM. */
|
|
#define IORESOURCE_PCI_FIXED (1<<4) /* Do not move resource */
|
|
#define IORESOURCE_PCI_EA_BEI (1<<5) /* BAR Equivalent Indicator */
|
|
|
|
/*
|
|
* I/O Resource Descriptors
|
|
*
|
|
* Descriptors are used by walk_iomem_res_desc() and region_intersects()
|
|
* for searching a specific resource range in the iomem table. Assign
|
|
* a new descriptor when a resource range supports the search interfaces.
|
|
* Otherwise, resource.desc must be set to IORES_DESC_NONE (0).
|
|
*/
|
|
enum {
|
|
IORES_DESC_NONE = 0,
|
|
IORES_DESC_CRASH_KERNEL = 1,
|
|
IORES_DESC_ACPI_TABLES = 2,
|
|
IORES_DESC_ACPI_NV_STORAGE = 3,
|
|
IORES_DESC_PERSISTENT_MEMORY = 4,
|
|
IORES_DESC_PERSISTENT_MEMORY_LEGACY = 5,
|
|
IORES_DESC_DEVICE_PRIVATE_MEMORY = 6,
|
|
IORES_DESC_RESERVED = 7,
|
|
IORES_DESC_SOFT_RESERVED = 8,
|
|
};
|
|
|
|
/*
|
|
* Flags controlling ioremap() behavior.
|
|
*/
|
|
enum {
|
|
IORES_MAP_SYSTEM_RAM = BIT(0),
|
|
IORES_MAP_ENCRYPTED = BIT(1),
|
|
};
|
|
|
|
/* helpers to define resources */
|
|
#define DEFINE_RES_NAMED(_start, _size, _name, _flags) \
|
|
{ \
|
|
.start = (_start), \
|
|
.end = (_start) + (_size) - 1, \
|
|
.name = (_name), \
|
|
.flags = (_flags), \
|
|
.desc = IORES_DESC_NONE, \
|
|
}
|
|
|
|
#define DEFINE_RES_IO_NAMED(_start, _size, _name) \
|
|
DEFINE_RES_NAMED((_start), (_size), (_name), IORESOURCE_IO)
|
|
#define DEFINE_RES_IO(_start, _size) \
|
|
DEFINE_RES_IO_NAMED((_start), (_size), NULL)
|
|
|
|
#define DEFINE_RES_MEM_NAMED(_start, _size, _name) \
|
|
DEFINE_RES_NAMED((_start), (_size), (_name), IORESOURCE_MEM)
|
|
#define DEFINE_RES_MEM(_start, _size) \
|
|
DEFINE_RES_MEM_NAMED((_start), (_size), NULL)
|
|
|
|
#define DEFINE_RES_IRQ_NAMED(_irq, _name) \
|
|
DEFINE_RES_NAMED((_irq), 1, (_name), IORESOURCE_IRQ)
|
|
#define DEFINE_RES_IRQ(_irq) \
|
|
DEFINE_RES_IRQ_NAMED((_irq), NULL)
|
|
|
|
#define DEFINE_RES_DMA_NAMED(_dma, _name) \
|
|
DEFINE_RES_NAMED((_dma), 1, (_name), IORESOURCE_DMA)
|
|
#define DEFINE_RES_DMA(_dma) \
|
|
DEFINE_RES_DMA_NAMED((_dma), NULL)
|
|
|
|
/* PC/ISA/whatever - the normal PC address spaces: IO and memory */
|
|
extern struct resource ioport_resource;
|
|
extern struct resource iomem_resource;
|
|
|
|
extern struct resource *request_resource_conflict(struct resource *root, struct resource *new);
|
|
extern int request_resource(struct resource *root, struct resource *new);
|
|
extern int release_resource(struct resource *new);
|
|
void release_child_resources(struct resource *new);
|
|
extern void reserve_region_with_split(struct resource *root,
|
|
resource_size_t start, resource_size_t end,
|
|
const char *name);
|
|
extern struct resource *insert_resource_conflict(struct resource *parent, struct resource *new);
|
|
extern int insert_resource(struct resource *parent, struct resource *new);
|
|
extern void insert_resource_expand_to_fit(struct resource *root, struct resource *new);
|
|
extern int remove_resource(struct resource *old);
|
|
extern void arch_remove_reservations(struct resource *avail);
|
|
extern int allocate_resource(struct resource *root, struct resource *new,
|
|
resource_size_t size, resource_size_t min,
|
|
resource_size_t max, resource_size_t align,
|
|
resource_size_t (*alignf)(void *,
|
|
const struct resource *,
|
|
resource_size_t,
|
|
resource_size_t),
|
|
void *alignf_data);
|
|
struct resource *lookup_resource(struct resource *root, resource_size_t start);
|
|
int adjust_resource(struct resource *res, resource_size_t start,
|
|
resource_size_t size);
|
|
resource_size_t resource_alignment(struct resource *res);
|
|
static inline resource_size_t resource_size(const struct resource *res)
|
|
{
|
|
return res->end - res->start + 1;
|
|
}
|
|
static inline unsigned long resource_type(const struct resource *res)
|
|
{
|
|
return res->flags & IORESOURCE_TYPE_BITS;
|
|
}
|
|
static inline unsigned long resource_ext_type(const struct resource *res)
|
|
{
|
|
return res->flags & IORESOURCE_EXT_TYPE_BITS;
|
|
}
|
|
/* True iff r1 completely contains r2 */
|
|
static inline bool resource_contains(struct resource *r1, struct resource *r2)
|
|
{
|
|
if (resource_type(r1) != resource_type(r2))
|
|
return false;
|
|
if (r1->flags & IORESOURCE_UNSET || r2->flags & IORESOURCE_UNSET)
|
|
return false;
|
|
return r1->start <= r2->start && r1->end >= r2->end;
|
|
}
|
|
|
|
/* True if any part of r1 overlaps r2 */
|
|
static inline bool resource_overlaps(struct resource *r1, struct resource *r2)
|
|
{
|
|
return r1->start <= r2->end && r1->end >= r2->start;
|
|
}
|
|
|
|
static inline bool
|
|
resource_intersection(struct resource *r1, struct resource *r2, struct resource *r)
|
|
{
|
|
if (!resource_overlaps(r1, r2))
|
|
return false;
|
|
r->start = max(r1->start, r2->start);
|
|
r->end = min(r1->end, r2->end);
|
|
return true;
|
|
}
|
|
|
|
static inline bool
|
|
resource_union(struct resource *r1, struct resource *r2, struct resource *r)
|
|
{
|
|
if (!resource_overlaps(r1, r2))
|
|
return false;
|
|
r->start = min(r1->start, r2->start);
|
|
r->end = max(r1->end, r2->end);
|
|
return true;
|
|
}
|
|
|
|
/* Convenience shorthand with allocation */
|
|
#define request_region(start,n,name) __request_region(&ioport_resource, (start), (n), (name), 0)
|
|
#define request_muxed_region(start,n,name) __request_region(&ioport_resource, (start), (n), (name), IORESOURCE_MUXED)
|
|
#define __request_mem_region(start,n,name, excl) __request_region(&iomem_resource, (start), (n), (name), excl)
|
|
#define request_mem_region(start,n,name) __request_region(&iomem_resource, (start), (n), (name), 0)
|
|
#define request_mem_region_muxed(start, n, name) \
|
|
__request_region(&iomem_resource, (start), (n), (name), IORESOURCE_MUXED)
|
|
#define request_mem_region_exclusive(start,n,name) \
|
|
__request_region(&iomem_resource, (start), (n), (name), IORESOURCE_EXCLUSIVE)
|
|
#define rename_region(region, newname) do { (region)->name = (newname); } while (0)
|
|
|
|
extern struct resource * __request_region(struct resource *,
|
|
resource_size_t start,
|
|
resource_size_t n,
|
|
const char *name, int flags);
|
|
|
|
/* Compatibility cruft */
|
|
#define release_region(start,n) __release_region(&ioport_resource, (start), (n))
|
|
#define release_mem_region(start,n) __release_region(&iomem_resource, (start), (n))
|
|
|
|
extern void __release_region(struct resource *, resource_size_t,
|
|
resource_size_t);
|
|
#ifdef CONFIG_MEMORY_HOTREMOVE
|
|
extern void release_mem_region_adjustable(resource_size_t, resource_size_t);
|
|
#endif
|
|
#ifdef CONFIG_MEMORY_HOTPLUG
|
|
extern void merge_system_ram_resource(struct resource *res);
|
|
#endif
|
|
|
|
/* Wrappers for managed devices */
|
|
struct device;
|
|
|
|
extern int devm_request_resource(struct device *dev, struct resource *root,
|
|
struct resource *new);
|
|
extern void devm_release_resource(struct device *dev, struct resource *new);
|
|
|
|
#define devm_request_region(dev,start,n,name) \
|
|
__devm_request_region(dev, &ioport_resource, (start), (n), (name))
|
|
#define devm_request_mem_region(dev,start,n,name) \
|
|
__devm_request_region(dev, &iomem_resource, (start), (n), (name))
|
|
|
|
extern struct resource * __devm_request_region(struct device *dev,
|
|
struct resource *parent, resource_size_t start,
|
|
resource_size_t n, const char *name);
|
|
|
|
#define devm_release_region(dev, start, n) \
|
|
__devm_release_region(dev, &ioport_resource, (start), (n))
|
|
#define devm_release_mem_region(dev, start, n) \
|
|
__devm_release_region(dev, &iomem_resource, (start), (n))
|
|
|
|
extern void __devm_release_region(struct device *dev, struct resource *parent,
|
|
resource_size_t start, resource_size_t n);
|
|
extern int iomem_map_sanity_check(resource_size_t addr, unsigned long size);
|
|
extern bool iomem_is_exclusive(u64 addr);
|
|
|
|
extern int
|
|
walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages,
|
|
void *arg, int (*func)(unsigned long, unsigned long, void *));
|
|
extern int
|
|
walk_mem_res(u64 start, u64 end, void *arg,
|
|
int (*func)(struct resource *, void *));
|
|
extern int
|
|
walk_system_ram_res(u64 start, u64 end, void *arg,
|
|
int (*func)(struct resource *, void *));
|
|
extern int
|
|
walk_iomem_res_desc(unsigned long desc, unsigned long flags, u64 start, u64 end,
|
|
void *arg, int (*func)(struct resource *, void *));
|
|
|
|
struct resource *devm_request_free_mem_region(struct device *dev,
|
|
struct resource *base, unsigned long size);
|
|
struct resource *request_free_mem_region(struct resource *base,
|
|
unsigned long size, const char *name);
|
|
|
|
static inline void irqresource_disabled(struct resource *res, u32 irq)
|
|
{
|
|
res->start = irq;
|
|
res->end = irq;
|
|
res->flags |= IORESOURCE_IRQ | IORESOURCE_DISABLED | IORESOURCE_UNSET;
|
|
}
|
|
|
|
extern struct address_space *iomem_get_mapping(void);
|
|
|
|
#endif /* __ASSEMBLY__ */
|
|
#endif /* _LINUX_IOPORT_H */
|