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Hierarchical memory region API
The memory API separates the attributes of a memory region (its size, how reads or writes are handled, dirty logging, and coalescing) from where it is mapped and whether it is enabled. This allows a device to configure a memory region once, then hand it off to its parent bus to map it according to the bus configuration. Hierarchical registration also allows a device to compose a region out of a number of sub-regions with different properties; for example some may be RAM while others may be MMIO. Reviewed-by: Anthony Liguori <aliguori@us.ibm.com> Signed-off-by: Avi Kivity <avi@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
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Avi Kivity
Anthony Liguori
parent
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commit
093bc2cd88
3 changed files with 1039 additions and 0 deletions
385
memory.h
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385
memory.h
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/*
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* Physical memory management API
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*
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* Copyright 2011 Red Hat, Inc. and/or its affiliates
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*
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* Authors:
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* Avi Kivity <avi@redhat.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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*/
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#ifndef MEMORY_H
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#define MEMORY_H
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#ifndef CONFIG_USER_ONLY
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#include <stdint.h>
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#include <stdbool.h>
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#include "qemu-common.h"
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#include "cpu-common.h"
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#include "targphys.h"
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#include "qemu-queue.h"
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typedef struct MemoryRegionOps MemoryRegionOps;
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typedef struct MemoryRegion MemoryRegion;
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/* Must match *_DIRTY_FLAGS in cpu-all.h. To be replaced with dynamic
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* registration.
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*/
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#define DIRTY_MEMORY_VGA 0
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#define DIRTY_MEMORY_CODE 1
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#define DIRTY_MEMORY_MIGRATION 3
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/*
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* Memory region callbacks
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*/
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struct MemoryRegionOps {
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/* Read from the memory region. @addr is relative to @mr; @size is
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* in bytes. */
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uint64_t (*read)(void *opaque,
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target_phys_addr_t addr,
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unsigned size);
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/* Write to the memory region. @addr is relative to @mr; @size is
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* in bytes. */
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void (*write)(void *opaque,
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target_phys_addr_t addr,
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uint64_t data,
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unsigned size);
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enum device_endian endianness;
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/* Guest-visible constraints: */
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struct {
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/* If nonzero, specify bounds on access sizes beyond which a machine
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* check is thrown.
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*/
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unsigned min_access_size;
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unsigned max_access_size;
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/* If true, unaligned accesses are supported. Otherwise unaligned
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* accesses throw machine checks.
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*/
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bool unaligned;
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} valid;
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/* Internal implementation constraints: */
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struct {
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/* If nonzero, specifies the minimum size implemented. Smaller sizes
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* will be rounded upwards and a partial result will be returned.
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*/
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unsigned min_access_size;
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/* If nonzero, specifies the maximum size implemented. Larger sizes
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* will be done as a series of accesses with smaller sizes.
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*/
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unsigned max_access_size;
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/* If true, unaligned accesses are supported. Otherwise all accesses
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* are converted to (possibly multiple) naturally aligned accesses.
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*/
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bool unaligned;
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} impl;
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};
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typedef struct CoalescedMemoryRange CoalescedMemoryRange;
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struct MemoryRegion {
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/* All fields are private - violators will be prosecuted */
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const MemoryRegionOps *ops;
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void *opaque;
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MemoryRegion *parent;
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uint64_t size;
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target_phys_addr_t addr;
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target_phys_addr_t offset;
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ram_addr_t ram_addr;
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bool has_ram_addr;
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MemoryRegion *alias;
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target_phys_addr_t alias_offset;
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unsigned priority;
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bool may_overlap;
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QTAILQ_HEAD(subregions, MemoryRegion) subregions;
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QTAILQ_ENTRY(MemoryRegion) subregions_link;
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QTAILQ_HEAD(coalesced_ranges, CoalescedMemoryRange) coalesced;
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const char *name;
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};
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/**
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* memory_region_init: Initialize a memory region
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*
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* The region typically acts as a container for other memory regions. Us
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* memory_region_add_subregion() to add subregions.
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*
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* @mr: the #MemoryRegion to be initialized
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* @name: used for debugging; not visible to the user or ABI
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* @size: size of the region; any subregions beyond this size will be clipped
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*/
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void memory_region_init(MemoryRegion *mr,
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const char *name,
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uint64_t size);
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/**
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* memory_region_init_io: Initialize an I/O memory region.
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*
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* Accesses into the region will be cause the callbacks in @ops to be called.
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* if @size is nonzero, subregions will be clipped to @size.
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*
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* @mr: the #MemoryRegion to be initialized.
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* @ops: a structure containing read and write callbacks to be used when
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* I/O is performed on the region.
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* @opaque: passed to to the read and write callbacks of the @ops structure.
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* @name: used for debugging; not visible to the user or ABI
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* @size: size of the region.
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*/
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void memory_region_init_io(MemoryRegion *mr,
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const MemoryRegionOps *ops,
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void *opaque,
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const char *name,
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uint64_t size);
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/**
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* memory_region_init_ram: Initialize RAM memory region. Accesses into the
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* region will be modify memory directly.
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*
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* @mr: the #MemoryRegion to be initialized.
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* @dev: a device associated with the region; may be %NULL.
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* @name: the name of the region; the pair (@dev, @name) must be globally
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* unique. The name is part of the save/restore ABI and so cannot be
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* changed.
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* @size: size of the region.
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*/
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void memory_region_init_ram(MemoryRegion *mr,
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DeviceState *dev, /* FIXME: layering violation */
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const char *name,
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uint64_t size);
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/**
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* memory_region_init_ram: Initialize RAM memory region from a user-provided.
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* pointer. Accesses into the region will be modify
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* memory directly.
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*
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* @mr: the #MemoryRegion to be initialized.
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* @dev: a device associated with the region; may be %NULL.
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* @name: the name of the region; the pair (@dev, @name) must be globally
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* unique. The name is part of the save/restore ABI and so cannot be
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* changed.
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* @size: size of the region.
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* @ptr: memory to be mapped; must contain at least @size bytes.
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*/
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void memory_region_init_ram_ptr(MemoryRegion *mr,
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DeviceState *dev, /* FIXME: layering violation */
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const char *name,
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uint64_t size,
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void *ptr);
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/**
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* memory_region_init_alias: Initialize a memory region that aliases all or a
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* part of another memory region.
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*
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* @mr: the #MemoryRegion to be initialized.
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* @name: used for debugging; not visible to the user or ABI
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* @orig: the region to be referenced; @mr will be equivalent to
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* @orig between @offset and @offset + @size - 1.
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* @offset: start of the section in @orig to be referenced.
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* @size: size of the region.
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*/
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void memory_region_init_alias(MemoryRegion *mr,
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const char *name,
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MemoryRegion *orig,
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target_phys_addr_t offset,
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uint64_t size);
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/**
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* memory_region_destroy: Destroy a memory region and relaim all resources.
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*
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* @mr: the region to be destroyed. May not currently be a subregion
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* (see memory_region_add_subregion()) or referenced in an alias
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* (see memory_region_init_alias()).
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*/
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void memory_region_destroy(MemoryRegion *mr);
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/**
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* memory_region_size: get a memory region's size.
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*
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* @mr: the memory region being queried.
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*/
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uint64_t memory_region_size(MemoryRegion *mr);
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/**
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* memory_region_get_ram_ptr: Get a pointer into a RAM memory region.
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*
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* Returns a host pointer to a RAM memory region (created with
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* memory_region_init_ram() or memory_region_init_ram_ptr()). Use with
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* care.
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*
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* @mr: the memory region being queried.
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*/
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void *memory_region_get_ram_ptr(MemoryRegion *mr);
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/**
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* memory_region_set_offset: Sets an offset to be added to MemoryRegionOps
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* callbacks.
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*
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* This function is deprecated and should not be used in new code.
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*/
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void memory_region_set_offset(MemoryRegion *mr, target_phys_addr_t offset);
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/**
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* memory_region_set_log: Turn dirty logging on or off for a region.
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*
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* Turns dirty logging on or off for a specified client (display, migration).
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* Only meaningful for RAM regions.
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*
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* @mr: the memory region being updated.
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* @log: whether dirty logging is to be enabled or disabled.
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* @client: the user of the logging information; %DIRTY_MEMORY_MIGRATION or
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* %DIRTY_MEMORY_VGA.
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*/
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void memory_region_set_log(MemoryRegion *mr, bool log, unsigned client);
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/**
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* memory_region_get_dirty: Check whether a page is dirty for a specified
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* client.
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*
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* Checks whether a page has been written to since the last
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* call to memory_region_reset_dirty() with the same @client. Dirty logging
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* must be enabled.
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*
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* @mr: the memory region being queried.
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* @addr: the address (relative to the start of the region) being queried.
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* @client: the user of the logging information; %DIRTY_MEMORY_MIGRATION or
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* %DIRTY_MEMORY_VGA.
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*/
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bool memory_region_get_dirty(MemoryRegion *mr, target_phys_addr_t addr,
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unsigned client);
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/**
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* memory_region_set_dirty: Mark a page as dirty in a memory region.
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*
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* Marks a page as dirty, after it has been dirtied outside guest code.
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*
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* @mr: the memory region being queried.
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* @addr: the address (relative to the start of the region) being dirtied.
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*/
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void memory_region_set_dirty(MemoryRegion *mr, target_phys_addr_t addr);
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/**
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* memory_region_sync_dirty_bitmap: Synchronize a region's dirty bitmap with
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* any external TLBs (e.g. kvm)
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*
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* Flushes dirty information from accelerators such as kvm and vhost-net
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* and makes it available to users of the memory API.
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*
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* @mr: the region being flushed.
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*/
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void memory_region_sync_dirty_bitmap(MemoryRegion *mr);
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/**
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* memory_region_reset_dirty: Mark a range of pages as clean, for a specified
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* client.
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*
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* Marks a range of pages as no longer dirty.
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*
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* @mr: the region being updated.
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* @addr: the start of the subrange being cleaned.
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* @size: the size of the subrange being cleaned.
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* @client: the user of the logging information; %DIRTY_MEMORY_MIGRATION or
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* %DIRTY_MEMORY_VGA.
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*/
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void memory_region_reset_dirty(MemoryRegion *mr, target_phys_addr_t addr,
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target_phys_addr_t size, unsigned client);
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/**
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* memory_region_set_readonly: Turn a memory region read-only (or read-write)
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*
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* Allows a memory region to be marked as read-only (turning it into a ROM).
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* only useful on RAM regions.
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*
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* @mr: the region being updated.
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* @readonly: whether rhe region is to be ROM or RAM.
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*/
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void memory_region_set_readonly(MemoryRegion *mr, bool readonly);
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/**
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* memory_region_set_coalescing: Enable memory coalescing for the region.
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*
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* Enabled writes to a region to be queued for later processing. MMIO ->write
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* callbacks may be delayed until a non-coalesced MMIO is issued.
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* Only useful for IO regions. Roughly similar to write-combining hardware.
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*
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* @mr: the memory region to be write coalesced
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*/
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void memory_region_set_coalescing(MemoryRegion *mr);
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/**
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* memory_region_add_coalescing: Enable memory coalescing for a sub-range of
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* a region.
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*
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* Like memory_region_set_coalescing(), but works on a sub-range of a region.
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* Multiple calls can be issued coalesced disjoint ranges.
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*
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* @mr: the memory region to be updated.
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* @offset: the start of the range within the region to be coalesced.
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* @size: the size of the subrange to be coalesced.
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*/
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void memory_region_add_coalescing(MemoryRegion *mr,
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target_phys_addr_t offset,
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uint64_t size);
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/**
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* memory_region_clear_coalescing: Disable MMIO coalescing for the region.
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*
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* Disables any coalescing caused by memory_region_set_coalescing() or
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* memory_region_add_coalescing(). Roughly equivalent to uncacheble memory
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* hardware.
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*
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* @mr: the memory region to be updated.
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*/
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void memory_region_clear_coalescing(MemoryRegion *mr);
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/**
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* memory_region_add_subregion: Add a sub-region to a container.
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*
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* Adds a sub-region at @offset. The sub-region may not overlap with other
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* subregions (except for those explicitly marked as overlapping). A region
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* may only be added once as a subregion (unless removed with
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* memory_region_del_subregion()); use memory_region_init_alias() if you
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* want a region to be a subregion in multiple locations.
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*
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* @mr: the region to contain the new subregion; must be a container
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* initialized with memory_region_init().
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* @offset: the offset relative to @mr where @subregion is added.
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* @subregion: the subregion to be added.
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*/
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void memory_region_add_subregion(MemoryRegion *mr,
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target_phys_addr_t offset,
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MemoryRegion *subregion);
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/**
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* memory_region_add_subregion: Add a sub-region to a container, with overlap.
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*
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* Adds a sub-region at @offset. The sub-region may overlap with other
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* subregions. Conflicts are resolved by having a higher @priority hide a
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* lower @priority. Subregions without priority are taken as @priority 0.
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* A region may only be added once as a subregion (unless removed with
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* memory_region_del_subregion()); use memory_region_init_alias() if you
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* want a region to be a subregion in multiple locations.
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*
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* @mr: the region to contain the new subregion; must be a container
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* initialized with memory_region_init().
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* @offset: the offset relative to @mr where @subregion is added.
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* @subregion: the subregion to be added.
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* @priority: used for resolving overlaps; highest priority wins.
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*/
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void memory_region_add_subregion_overlap(MemoryRegion *mr,
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target_phys_addr_t offset,
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MemoryRegion *subregion,
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unsigned priority);
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/**
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* memory_region_del_subregion: Remove a subregion.
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*
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* Removes a subregion from its container.
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*
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* @mr: the container to be updated.
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* @subregion: the region being removed; must be a current subregion of @mr.
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*/
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void memory_region_del_subregion(MemoryRegion *mr,
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MemoryRegion *subregion);
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#endif
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#endif
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