/* $NetBSD: drm_mm.h,v 1.5 2018/08/27 04:58:38 riastradh Exp $ */
/**************************************************************************
*
* Copyright 2006-2008 Tungsten Graphics, Inc., Cedar Park, TX. USA.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sub license, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
* USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*
**************************************************************************/
/*
* Authors:
* Thomas Hellstrom <thomas-at-tungstengraphics-dot-com>
*/
#ifndef _DRM_MM_H_
#define _DRM_MM_H_
/*
* Generic range manager structs
*/
#include <linux/bug.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/spinlock.h>
#ifdef CONFIG_DEBUG_FS
#include <linux/seq_file.h>
#endif
#include <linux/spinlock.h>
enum drm_mm_search_flags {
DRM_MM_SEARCH_DEFAULT = 0,
DRM_MM_SEARCH_BEST = 1 << 0,
DRM_MM_SEARCH_BELOW = 1 << 1,
};
enum drm_mm_allocator_flags {
DRM_MM_CREATE_DEFAULT = 0,
DRM_MM_CREATE_TOP = 1 << 0,
};
#define DRM_MM_BOTTOMUP DRM_MM_SEARCH_DEFAULT, DRM_MM_CREATE_DEFAULT
#define DRM_MM_TOPDOWN DRM_MM_SEARCH_BELOW, DRM_MM_CREATE_TOP
struct drm_mm_node {
struct list_head node_list;
struct list_head hole_stack;
unsigned hole_follows : 1;
unsigned scanned_block : 1;
unsigned scanned_prev_free : 1;
unsigned scanned_next_free : 1;
unsigned scanned_preceeds_hole : 1;
unsigned allocated : 1;
unsigned long color;
u64 start;
u64 size;
struct drm_mm *mm;
};
struct drm_mm {
/* List of all memory nodes that immediately precede a free hole. */
struct list_head hole_stack;
/* head_node.node_list is the list of all memory nodes, ordered
* according to the (increasing) start address of the memory node. */
struct drm_mm_node head_node;
unsigned int scan_check_range : 1;
unsigned scan_alignment;
unsigned long scan_color;
u64 scan_size;
u64 scan_hit_start;
u64 scan_hit_end;
unsigned scanned_blocks;
u64 scan_start;
u64 scan_end;
struct drm_mm_node *prev_scanned_node;
void (*color_adjust)(struct drm_mm_node *node, unsigned long color,
u64 *start, u64 *end);
};
/**
* drm_mm_node_allocated - checks whether a node is allocated
* @node: drm_mm_node to check
*
* Drivers should use this helpers for proper encapusulation of drm_mm
* internals.
*
* Returns:
* True if the @node is allocated.
*/
static inline bool drm_mm_node_allocated(struct drm_mm_node *node)
{
return node->allocated;
}
/**
* drm_mm_initialized - checks whether an allocator is initialized
* @mm: drm_mm to check
*
* Drivers should use this helpers for proper encapusulation of drm_mm
* internals.
*
* Returns:
* True if the @mm is initialized.
*/
static inline bool drm_mm_initialized(struct drm_mm *mm)
{
return mm->hole_stack.next;
}
static inline u64 __drm_mm_hole_node_start(struct drm_mm_node *hole_node)
{
return hole_node->start + hole_node->size;
}
/**
* drm_mm_hole_node_start - computes the start of the hole following @node
* @hole_node: drm_mm_node which implicitly tracks the following hole
*
* This is useful for driver-sepific debug dumpers. Otherwise drivers should not
* inspect holes themselves. Drivers must check first whether a hole indeed
* follows by looking at node->hole_follows.
*
* Returns:
* Start of the subsequent hole.
*/
static inline u64 drm_mm_hole_node_start(struct drm_mm_node *hole_node)
{
BUG_ON(!hole_node->hole_follows);
return __drm_mm_hole_node_start(hole_node);
}
static inline u64 __drm_mm_hole_node_end(struct drm_mm_node *hole_node)
{
return list_entry(hole_node->node_list.next,
struct drm_mm_node, node_list)->start;
}
/**
* drm_mm_hole_node_end - computes the end of the hole following @node
* @hole_node: drm_mm_node which implicitly tracks the following hole
*
* This is useful for driver-sepific debug dumpers. Otherwise drivers should not
* inspect holes themselves. Drivers must check first whether a hole indeed
* follows by looking at node->hole_follows.
*
* Returns:
* End of the subsequent hole.
*/
static inline u64 drm_mm_hole_node_end(struct drm_mm_node *hole_node)
{
return __drm_mm_hole_node_end(hole_node);
}
/**
* drm_mm_for_each_node - iterator to walk over all allocated nodes
* @entry: drm_mm_node structure to assign to in each iteration step
* @mm: drm_mm allocator to walk
*
* This iterator walks over all nodes in the range allocator. It is implemented
* with list_for_each, so not save against removal of elements.
*/
#define drm_mm_for_each_node(entry, mm) list_for_each_entry(entry, \
&(mm)->head_node.node_list, \
node_list)
/**
* drm_mm_for_each_hole - iterator to walk over all holes
* @entry: drm_mm_node used internally to track progress
* @mm: drm_mm allocator to walk
* @hole_start: ulong variable to assign the hole start to on each iteration
* @hole_end: ulong variable to assign the hole end to on each iteration
*
* This iterator walks over all holes in the range allocator. It is implemented
* with list_for_each, so not save against removal of elements. @entry is used
* internally and will not reflect a real drm_mm_node for the very first hole.
* Hence users of this iterator may not access it.
*
* Implementation Note:
* We need to inline list_for_each_entry in order to be able to set hole_start
* and hole_end on each iteration while keeping the macro sane.
*
* The __drm_mm_for_each_hole version is similar, but with added support for
* going backwards.
*/
#define drm_mm_for_each_hole(entry, mm, hole_start, hole_end) \
for (entry = list_entry((mm)->hole_stack.next, struct drm_mm_node, hole_stack); \
&entry->hole_stack != &(mm)->hole_stack ? \
hole_start = drm_mm_hole_node_start(entry), \
hole_end = drm_mm_hole_node_end(entry), \
1 : 0; \
entry = list_entry(entry->hole_stack.next, struct drm_mm_node, hole_stack))
#define __drm_mm_for_each_hole(entry, mm, hole_start, hole_end, backwards) \
for (entry = list_entry((backwards) ? (mm)->hole_stack.prev : (mm)->hole_stack.next, struct drm_mm_node, hole_stack); \
&entry->hole_stack != &(mm)->hole_stack ? \
hole_start = drm_mm_hole_node_start(entry), \
hole_end = drm_mm_hole_node_end(entry), \
1 : 0; \
entry = list_entry((backwards) ? entry->hole_stack.prev : entry->hole_stack.next, struct drm_mm_node, hole_stack))
/*
* Basic range manager support (drm_mm.c)
*/
int drm_mm_reserve_node(struct drm_mm *mm, struct drm_mm_node *node);
int drm_mm_insert_node_generic(struct drm_mm *mm,
struct drm_mm_node *node,
u64 size,
unsigned alignment,
unsigned long color,
enum drm_mm_search_flags sflags,
enum drm_mm_allocator_flags aflags);
/**
* drm_mm_insert_node - search for space and insert @node
* @mm: drm_mm to allocate from
* @node: preallocate node to insert
* @size: size of the allocation
* @alignment: alignment of the allocation
* @flags: flags to fine-tune the allocation
*
* This is a simplified version of drm_mm_insert_node_generic() with @color set
* to 0.
*
* The preallocated node must be cleared to 0.
*
* Returns:
* 0 on success, -ENOSPC if there's no suitable hole.
*/
static inline int drm_mm_insert_node(struct drm_mm *mm,
struct drm_mm_node *node,
u64 size,
unsigned alignment,
enum drm_mm_search_flags flags)
{
return drm_mm_insert_node_generic(mm, node, size, alignment, 0, flags,
DRM_MM_CREATE_DEFAULT);
}
int drm_mm_insert_node_in_range_generic(struct drm_mm *mm,
struct drm_mm_node *node,
u64 size,
unsigned alignment,
unsigned long color,
u64 start,
u64 end,
enum drm_mm_search_flags sflags,
enum drm_mm_allocator_flags aflags);
/**
* drm_mm_insert_node_in_range - ranged search for space and insert @node
* @mm: drm_mm to allocate from
* @node: preallocate node to insert
* @size: size of the allocation
* @alignment: alignment of the allocation
* @start: start of the allowed range for this node
* @end: end of the allowed range for this node
* @flags: flags to fine-tune the allocation
*
* This is a simplified version of drm_mm_insert_node_in_range_generic() with
* @color set to 0.
*
* The preallocated node must be cleared to 0.
*
* Returns:
* 0 on success, -ENOSPC if there's no suitable hole.
*/
static inline int drm_mm_insert_node_in_range(struct drm_mm *mm,
struct drm_mm_node *node,
u64 size,
unsigned alignment,
u64 start,
u64 end,
enum drm_mm_search_flags flags)
{
return drm_mm_insert_node_in_range_generic(mm, node, size, alignment,
0, start, end, flags,
DRM_MM_CREATE_DEFAULT);
}
void drm_mm_remove_node(struct drm_mm_node *node);
void drm_mm_replace_node(struct drm_mm_node *old, struct drm_mm_node *new);
void drm_mm_init(struct drm_mm *mm,
u64 start,
u64 size);
void drm_mm_takedown(struct drm_mm *mm);
bool drm_mm_clean(struct drm_mm *mm);
void drm_mm_init_scan(struct drm_mm *mm,
u64 size,
unsigned alignment,
unsigned long color);
void drm_mm_init_scan_with_range(struct drm_mm *mm,
u64 size,
unsigned alignment,
unsigned long color,
u64 start,
u64 end);
bool drm_mm_scan_add_block(struct drm_mm_node *node);
bool drm_mm_scan_remove_block(struct drm_mm_node *node);
void drm_mm_debug_table(struct drm_mm *mm, const char *prefix);
#ifdef CONFIG_DEBUG_FS
int drm_mm_dump_table(struct seq_file *m, struct drm_mm *mm);
#endif
#endif