linux/drivers/gpu/drm/drm_mm.c
Dave Airlie 735dc0d1e2 Merge branch 'drm-kms-locking' of git://people.freedesktop.org/~danvet/drm-intel into drm-next
The aim of this locking rework is that ioctls which a compositor should be
might call for every frame (set_cursor, page_flip, addfb, rmfb and
getfb/create_handle) should not be able to block on kms background
activities like output detection. And since each EDID read takes about
25ms (in the best case), that always means we'll drop at least one frame.

The solution is to add per-crtc locking for these ioctls, and restrict
background activities to only use the global lock. Change-the-world type
of events (modeset, dpms, ...) need to grab all locks.

Two tricky parts arose in the conversion:
- A lot of current code assumes that a kms fb object can't disappear while
  holding the global lock, since the current code serializes fb
  destruction with it. Hence proper lifetime management using the already
  created refcounting for fbs need to be instantiated for all ioctls and
  interfaces/users.

- The rmfb ioctl removes the to-be-deleted fb from all active users. But
  unconditionally taking the global kms lock to do so introduces an
  unacceptable potential stall point. And obviously changing the userspace
  abi isn't on the table, either. Hence this conversion opportunistically
  checks whether the rmfb ioctl holds the very last reference, which
  guarantees that the fb isn't in active use on any crtc or plane (thanks
  to the conversion to the new lifetime rules using proper refcounting).
  Only if this is not the case will the code go through the slowpath and
  grab all modeset locks. Sane compositors will never hit this path and so
  avoid the stall, but userspace relying on these semantics will also not
  break.

All these cases are exercised by the newly added subtests for the i-g-t
kms_flip, tested on a machine where a full detect cycle takes around 100
ms.  It works, and no frames are dropped any more with these patches
applied.  kms_flip also contains a special case to exercise the
above-describe rmfb slowpath.

* 'drm-kms-locking' of git://people.freedesktop.org/~danvet/drm-intel: (335 commits)
  drm/fb_helper: check whether fbcon is bound
  drm/doc: updates for new framebuffer lifetime rules
  drm: don't hold crtc mutexes for connector ->detect callbacks
  drm: only grab the crtc lock for pageflips
  drm: optimize drm_framebuffer_remove
  drm/vmwgfx: add proper framebuffer refcounting
  drm/i915: dump refcount into framebuffer debugfs file
  drm: refcounting for crtc framebuffers
  drm: refcounting for sprite framebuffers
  drm: fb refcounting for dirtyfb_ioctl
  drm: don't take modeset locks in getfb ioctl
  drm: push modeset_lock_all into ->fb_create driver callbacks
  drm: nest modeset locks within fpriv->fbs_lock
  drm: reference framebuffers which are on the idr
  drm: revamp framebuffer cleanup interfaces
  drm: create drm_framebuffer_lookup
  drm: revamp locking around fb creation/destruction
  drm: only take the crtc lock for ->cursor_move
  drm: only take the crtc lock for ->cursor_set
  drm: add per-crtc locks
  ...
2013-01-21 07:44:58 +10:00

793 lines
21 KiB
C

/**************************************************************************
*
* Copyright 2006 Tungsten Graphics, Inc., Bismarck, ND., 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.
*
*
**************************************************************************/
/*
* Generic simple memory manager implementation. Intended to be used as a base
* class implementation for more advanced memory managers.
*
* Note that the algorithm used is quite simple and there might be substantial
* performance gains if a smarter free list is implemented. Currently it is just an
* unordered stack of free regions. This could easily be improved if an RB-tree
* is used instead. At least if we expect heavy fragmentation.
*
* Aligned allocations can also see improvement.
*
* Authors:
* Thomas Hellström <thomas-at-tungstengraphics-dot-com>
*/
#include <drm/drmP.h>
#include <drm/drm_mm.h>
#include <linux/slab.h>
#include <linux/seq_file.h>
#include <linux/export.h>
#define MM_UNUSED_TARGET 4
static struct drm_mm_node *drm_mm_kmalloc(struct drm_mm *mm, int atomic)
{
struct drm_mm_node *child;
if (atomic)
child = kzalloc(sizeof(*child), GFP_ATOMIC);
else
child = kzalloc(sizeof(*child), GFP_KERNEL);
if (unlikely(child == NULL)) {
spin_lock(&mm->unused_lock);
if (list_empty(&mm->unused_nodes))
child = NULL;
else {
child =
list_entry(mm->unused_nodes.next,
struct drm_mm_node, node_list);
list_del(&child->node_list);
--mm->num_unused;
}
spin_unlock(&mm->unused_lock);
}
return child;
}
/* drm_mm_pre_get() - pre allocate drm_mm_node structure
* drm_mm: memory manager struct we are pre-allocating for
*
* Returns 0 on success or -ENOMEM if allocation fails.
*/
int drm_mm_pre_get(struct drm_mm *mm)
{
struct drm_mm_node *node;
spin_lock(&mm->unused_lock);
while (mm->num_unused < MM_UNUSED_TARGET) {
spin_unlock(&mm->unused_lock);
node = kzalloc(sizeof(*node), GFP_KERNEL);
spin_lock(&mm->unused_lock);
if (unlikely(node == NULL)) {
int ret = (mm->num_unused < 2) ? -ENOMEM : 0;
spin_unlock(&mm->unused_lock);
return ret;
}
++mm->num_unused;
list_add_tail(&node->node_list, &mm->unused_nodes);
}
spin_unlock(&mm->unused_lock);
return 0;
}
EXPORT_SYMBOL(drm_mm_pre_get);
static void drm_mm_insert_helper(struct drm_mm_node *hole_node,
struct drm_mm_node *node,
unsigned long size, unsigned alignment,
unsigned long color)
{
struct drm_mm *mm = hole_node->mm;
unsigned long hole_start = drm_mm_hole_node_start(hole_node);
unsigned long hole_end = drm_mm_hole_node_end(hole_node);
unsigned long adj_start = hole_start;
unsigned long adj_end = hole_end;
BUG_ON(node->allocated);
if (mm->color_adjust)
mm->color_adjust(hole_node, color, &adj_start, &adj_end);
if (alignment) {
unsigned tmp = adj_start % alignment;
if (tmp)
adj_start += alignment - tmp;
}
if (adj_start == hole_start) {
hole_node->hole_follows = 0;
list_del(&hole_node->hole_stack);
}
node->start = adj_start;
node->size = size;
node->mm = mm;
node->color = color;
node->allocated = 1;
INIT_LIST_HEAD(&node->hole_stack);
list_add(&node->node_list, &hole_node->node_list);
BUG_ON(node->start + node->size > adj_end);
node->hole_follows = 0;
if (__drm_mm_hole_node_start(node) < hole_end) {
list_add(&node->hole_stack, &mm->hole_stack);
node->hole_follows = 1;
}
}
struct drm_mm_node *drm_mm_create_block(struct drm_mm *mm,
unsigned long start,
unsigned long size,
bool atomic)
{
struct drm_mm_node *hole, *node;
unsigned long end = start + size;
unsigned long hole_start;
unsigned long hole_end;
drm_mm_for_each_hole(hole, mm, hole_start, hole_end) {
if (hole_start > start || hole_end < end)
continue;
node = drm_mm_kmalloc(mm, atomic);
if (unlikely(node == NULL))
return NULL;
node->start = start;
node->size = size;
node->mm = mm;
node->allocated = 1;
INIT_LIST_HEAD(&node->hole_stack);
list_add(&node->node_list, &hole->node_list);
if (start == hole_start) {
hole->hole_follows = 0;
list_del_init(&hole->hole_stack);
}
node->hole_follows = 0;
if (end != hole_end) {
list_add(&node->hole_stack, &mm->hole_stack);
node->hole_follows = 1;
}
return node;
}
WARN(1, "no hole found for block 0x%lx + 0x%lx\n", start, size);
return NULL;
}
EXPORT_SYMBOL(drm_mm_create_block);
struct drm_mm_node *drm_mm_get_block_generic(struct drm_mm_node *hole_node,
unsigned long size,
unsigned alignment,
unsigned long color,
int atomic)
{
struct drm_mm_node *node;
node = drm_mm_kmalloc(hole_node->mm, atomic);
if (unlikely(node == NULL))
return NULL;
drm_mm_insert_helper(hole_node, node, size, alignment, color);
return node;
}
EXPORT_SYMBOL(drm_mm_get_block_generic);
/**
* Search for free space and insert a preallocated memory node. Returns
* -ENOSPC if no suitable free area is available. The preallocated memory node
* must be cleared.
*/
int drm_mm_insert_node_generic(struct drm_mm *mm, struct drm_mm_node *node,
unsigned long size, unsigned alignment,
unsigned long color)
{
struct drm_mm_node *hole_node;
hole_node = drm_mm_search_free_generic(mm, size, alignment,
color, 0);
if (!hole_node)
return -ENOSPC;
drm_mm_insert_helper(hole_node, node, size, alignment, color);
return 0;
}
EXPORT_SYMBOL(drm_mm_insert_node_generic);
int drm_mm_insert_node(struct drm_mm *mm, struct drm_mm_node *node,
unsigned long size, unsigned alignment)
{
return drm_mm_insert_node_generic(mm, node, size, alignment, 0);
}
EXPORT_SYMBOL(drm_mm_insert_node);
static void drm_mm_insert_helper_range(struct drm_mm_node *hole_node,
struct drm_mm_node *node,
unsigned long size, unsigned alignment,
unsigned long color,
unsigned long start, unsigned long end)
{
struct drm_mm *mm = hole_node->mm;
unsigned long hole_start = drm_mm_hole_node_start(hole_node);
unsigned long hole_end = drm_mm_hole_node_end(hole_node);
unsigned long adj_start = hole_start;
unsigned long adj_end = hole_end;
BUG_ON(!hole_node->hole_follows || node->allocated);
if (adj_start < start)
adj_start = start;
if (adj_end > end)
adj_end = end;
if (mm->color_adjust)
mm->color_adjust(hole_node, color, &adj_start, &adj_end);
if (alignment) {
unsigned tmp = adj_start % alignment;
if (tmp)
adj_start += alignment - tmp;
}
if (adj_start == hole_start) {
hole_node->hole_follows = 0;
list_del(&hole_node->hole_stack);
}
node->start = adj_start;
node->size = size;
node->mm = mm;
node->color = color;
node->allocated = 1;
INIT_LIST_HEAD(&node->hole_stack);
list_add(&node->node_list, &hole_node->node_list);
BUG_ON(node->start + node->size > adj_end);
BUG_ON(node->start + node->size > end);
node->hole_follows = 0;
if (__drm_mm_hole_node_start(node) < hole_end) {
list_add(&node->hole_stack, &mm->hole_stack);
node->hole_follows = 1;
}
}
struct drm_mm_node *drm_mm_get_block_range_generic(struct drm_mm_node *hole_node,
unsigned long size,
unsigned alignment,
unsigned long color,
unsigned long start,
unsigned long end,
int atomic)
{
struct drm_mm_node *node;
node = drm_mm_kmalloc(hole_node->mm, atomic);
if (unlikely(node == NULL))
return NULL;
drm_mm_insert_helper_range(hole_node, node, size, alignment, color,
start, end);
return node;
}
EXPORT_SYMBOL(drm_mm_get_block_range_generic);
/**
* Search for free space and insert a preallocated memory node. Returns
* -ENOSPC if no suitable free area is available. This is for range
* restricted allocations. The preallocated memory node must be cleared.
*/
int drm_mm_insert_node_in_range_generic(struct drm_mm *mm, struct drm_mm_node *node,
unsigned long size, unsigned alignment, unsigned long color,
unsigned long start, unsigned long end)
{
struct drm_mm_node *hole_node;
hole_node = drm_mm_search_free_in_range_generic(mm,
size, alignment, color,
start, end, 0);
if (!hole_node)
return -ENOSPC;
drm_mm_insert_helper_range(hole_node, node,
size, alignment, color,
start, end);
return 0;
}
EXPORT_SYMBOL(drm_mm_insert_node_in_range_generic);
int drm_mm_insert_node_in_range(struct drm_mm *mm, struct drm_mm_node *node,
unsigned long size, unsigned alignment,
unsigned long start, unsigned long end)
{
return drm_mm_insert_node_in_range_generic(mm, node, size, alignment, 0, start, end);
}
EXPORT_SYMBOL(drm_mm_insert_node_in_range);
/**
* Remove a memory node from the allocator.
*/
void drm_mm_remove_node(struct drm_mm_node *node)
{
struct drm_mm *mm = node->mm;
struct drm_mm_node *prev_node;
BUG_ON(node->scanned_block || node->scanned_prev_free
|| node->scanned_next_free);
prev_node =
list_entry(node->node_list.prev, struct drm_mm_node, node_list);
if (node->hole_follows) {
BUG_ON(__drm_mm_hole_node_start(node) ==
__drm_mm_hole_node_end(node));
list_del(&node->hole_stack);
} else
BUG_ON(__drm_mm_hole_node_start(node) !=
__drm_mm_hole_node_end(node));
if (!prev_node->hole_follows) {
prev_node->hole_follows = 1;
list_add(&prev_node->hole_stack, &mm->hole_stack);
} else
list_move(&prev_node->hole_stack, &mm->hole_stack);
list_del(&node->node_list);
node->allocated = 0;
}
EXPORT_SYMBOL(drm_mm_remove_node);
/*
* Remove a memory node from the allocator and free the allocated struct
* drm_mm_node. Only to be used on a struct drm_mm_node obtained by one of the
* drm_mm_get_block functions.
*/
void drm_mm_put_block(struct drm_mm_node *node)
{
struct drm_mm *mm = node->mm;
drm_mm_remove_node(node);
spin_lock(&mm->unused_lock);
if (mm->num_unused < MM_UNUSED_TARGET) {
list_add(&node->node_list, &mm->unused_nodes);
++mm->num_unused;
} else
kfree(node);
spin_unlock(&mm->unused_lock);
}
EXPORT_SYMBOL(drm_mm_put_block);
static int check_free_hole(unsigned long start, unsigned long end,
unsigned long size, unsigned alignment)
{
if (end - start < size)
return 0;
if (alignment) {
unsigned tmp = start % alignment;
if (tmp)
start += alignment - tmp;
}
return end >= start + size;
}
struct drm_mm_node *drm_mm_search_free_generic(const struct drm_mm *mm,
unsigned long size,
unsigned alignment,
unsigned long color,
bool best_match)
{
struct drm_mm_node *entry;
struct drm_mm_node *best;
unsigned long adj_start;
unsigned long adj_end;
unsigned long best_size;
BUG_ON(mm->scanned_blocks);
best = NULL;
best_size = ~0UL;
drm_mm_for_each_hole(entry, mm, adj_start, adj_end) {
if (mm->color_adjust) {
mm->color_adjust(entry, color, &adj_start, &adj_end);
if (adj_end <= adj_start)
continue;
}
if (!check_free_hole(adj_start, adj_end, size, alignment))
continue;
if (!best_match)
return entry;
if (entry->size < best_size) {
best = entry;
best_size = entry->size;
}
}
return best;
}
EXPORT_SYMBOL(drm_mm_search_free_generic);
struct drm_mm_node *drm_mm_search_free_in_range_generic(const struct drm_mm *mm,
unsigned long size,
unsigned alignment,
unsigned long color,
unsigned long start,
unsigned long end,
bool best_match)
{
struct drm_mm_node *entry;
struct drm_mm_node *best;
unsigned long adj_start;
unsigned long adj_end;
unsigned long best_size;
BUG_ON(mm->scanned_blocks);
best = NULL;
best_size = ~0UL;
drm_mm_for_each_hole(entry, mm, adj_start, adj_end) {
if (adj_start < start)
adj_start = start;
if (adj_end > end)
adj_end = end;
if (mm->color_adjust) {
mm->color_adjust(entry, color, &adj_start, &adj_end);
if (adj_end <= adj_start)
continue;
}
if (!check_free_hole(adj_start, adj_end, size, alignment))
continue;
if (!best_match)
return entry;
if (entry->size < best_size) {
best = entry;
best_size = entry->size;
}
}
return best;
}
EXPORT_SYMBOL(drm_mm_search_free_in_range_generic);
/**
* Moves an allocation. To be used with embedded struct drm_mm_node.
*/
void drm_mm_replace_node(struct drm_mm_node *old, struct drm_mm_node *new)
{
list_replace(&old->node_list, &new->node_list);
list_replace(&old->hole_stack, &new->hole_stack);
new->hole_follows = old->hole_follows;
new->mm = old->mm;
new->start = old->start;
new->size = old->size;
new->color = old->color;
old->allocated = 0;
new->allocated = 1;
}
EXPORT_SYMBOL(drm_mm_replace_node);
/**
* Initializa lru scanning.
*
* This simply sets up the scanning routines with the parameters for the desired
* hole.
*
* Warning: As long as the scan list is non-empty, no other operations than
* adding/removing nodes to/from the scan list are allowed.
*/
void drm_mm_init_scan(struct drm_mm *mm,
unsigned long size,
unsigned alignment,
unsigned long color)
{
mm->scan_color = color;
mm->scan_alignment = alignment;
mm->scan_size = size;
mm->scanned_blocks = 0;
mm->scan_hit_start = 0;
mm->scan_hit_end = 0;
mm->scan_check_range = 0;
mm->prev_scanned_node = NULL;
}
EXPORT_SYMBOL(drm_mm_init_scan);
/**
* Initializa lru scanning.
*
* This simply sets up the scanning routines with the parameters for the desired
* hole. This version is for range-restricted scans.
*
* Warning: As long as the scan list is non-empty, no other operations than
* adding/removing nodes to/from the scan list are allowed.
*/
void drm_mm_init_scan_with_range(struct drm_mm *mm,
unsigned long size,
unsigned alignment,
unsigned long color,
unsigned long start,
unsigned long end)
{
mm->scan_color = color;
mm->scan_alignment = alignment;
mm->scan_size = size;
mm->scanned_blocks = 0;
mm->scan_hit_start = 0;
mm->scan_hit_end = 0;
mm->scan_start = start;
mm->scan_end = end;
mm->scan_check_range = 1;
mm->prev_scanned_node = NULL;
}
EXPORT_SYMBOL(drm_mm_init_scan_with_range);
/**
* Add a node to the scan list that might be freed to make space for the desired
* hole.
*
* Returns non-zero, if a hole has been found, zero otherwise.
*/
int drm_mm_scan_add_block(struct drm_mm_node *node)
{
struct drm_mm *mm = node->mm;
struct drm_mm_node *prev_node;
unsigned long hole_start, hole_end;
unsigned long adj_start, adj_end;
mm->scanned_blocks++;
BUG_ON(node->scanned_block);
node->scanned_block = 1;
prev_node = list_entry(node->node_list.prev, struct drm_mm_node,
node_list);
node->scanned_preceeds_hole = prev_node->hole_follows;
prev_node->hole_follows = 1;
list_del(&node->node_list);
node->node_list.prev = &prev_node->node_list;
node->node_list.next = &mm->prev_scanned_node->node_list;
mm->prev_scanned_node = node;
adj_start = hole_start = drm_mm_hole_node_start(prev_node);
adj_end = hole_end = drm_mm_hole_node_end(prev_node);
if (mm->scan_check_range) {
if (adj_start < mm->scan_start)
adj_start = mm->scan_start;
if (adj_end > mm->scan_end)
adj_end = mm->scan_end;
}
if (mm->color_adjust)
mm->color_adjust(prev_node, mm->scan_color,
&adj_start, &adj_end);
if (check_free_hole(adj_start, adj_end,
mm->scan_size, mm->scan_alignment)) {
mm->scan_hit_start = hole_start;
mm->scan_hit_end = hole_end;
return 1;
}
return 0;
}
EXPORT_SYMBOL(drm_mm_scan_add_block);
/**
* Remove a node from the scan list.
*
* Nodes _must_ be removed in the exact same order from the scan list as they
* have been added, otherwise the internal state of the memory manager will be
* corrupted.
*
* When the scan list is empty, the selected memory nodes can be freed. An
* immediately following drm_mm_search_free with best_match = 0 will then return
* the just freed block (because its at the top of the free_stack list).
*
* Returns one if this block should be evicted, zero otherwise. Will always
* return zero when no hole has been found.
*/
int drm_mm_scan_remove_block(struct drm_mm_node *node)
{
struct drm_mm *mm = node->mm;
struct drm_mm_node *prev_node;
mm->scanned_blocks--;
BUG_ON(!node->scanned_block);
node->scanned_block = 0;
prev_node = list_entry(node->node_list.prev, struct drm_mm_node,
node_list);
prev_node->hole_follows = node->scanned_preceeds_hole;
list_add(&node->node_list, &prev_node->node_list);
return (drm_mm_hole_node_end(node) > mm->scan_hit_start &&
node->start < mm->scan_hit_end);
}
EXPORT_SYMBOL(drm_mm_scan_remove_block);
int drm_mm_clean(struct drm_mm * mm)
{
struct list_head *head = &mm->head_node.node_list;
return (head->next->next == head);
}
EXPORT_SYMBOL(drm_mm_clean);
int drm_mm_init(struct drm_mm * mm, unsigned long start, unsigned long size)
{
INIT_LIST_HEAD(&mm->hole_stack);
INIT_LIST_HEAD(&mm->unused_nodes);
mm->num_unused = 0;
mm->scanned_blocks = 0;
spin_lock_init(&mm->unused_lock);
/* Clever trick to avoid a special case in the free hole tracking. */
INIT_LIST_HEAD(&mm->head_node.node_list);
INIT_LIST_HEAD(&mm->head_node.hole_stack);
mm->head_node.hole_follows = 1;
mm->head_node.scanned_block = 0;
mm->head_node.scanned_prev_free = 0;
mm->head_node.scanned_next_free = 0;
mm->head_node.mm = mm;
mm->head_node.start = start + size;
mm->head_node.size = start - mm->head_node.start;
list_add_tail(&mm->head_node.hole_stack, &mm->hole_stack);
mm->color_adjust = NULL;
return 0;
}
EXPORT_SYMBOL(drm_mm_init);
void drm_mm_takedown(struct drm_mm * mm)
{
struct drm_mm_node *entry, *next;
if (!list_empty(&mm->head_node.node_list)) {
DRM_ERROR("Memory manager not clean. Delaying takedown\n");
return;
}
spin_lock(&mm->unused_lock);
list_for_each_entry_safe(entry, next, &mm->unused_nodes, node_list) {
list_del(&entry->node_list);
kfree(entry);
--mm->num_unused;
}
spin_unlock(&mm->unused_lock);
BUG_ON(mm->num_unused != 0);
}
EXPORT_SYMBOL(drm_mm_takedown);
void drm_mm_debug_table(struct drm_mm *mm, const char *prefix)
{
struct drm_mm_node *entry;
unsigned long total_used = 0, total_free = 0, total = 0;
unsigned long hole_start, hole_end, hole_size;
hole_start = drm_mm_hole_node_start(&mm->head_node);
hole_end = drm_mm_hole_node_end(&mm->head_node);
hole_size = hole_end - hole_start;
if (hole_size)
printk(KERN_DEBUG "%s 0x%08lx-0x%08lx: %8lu: free\n",
prefix, hole_start, hole_end,
hole_size);
total_free += hole_size;
drm_mm_for_each_node(entry, mm) {
printk(KERN_DEBUG "%s 0x%08lx-0x%08lx: %8lu: used\n",
prefix, entry->start, entry->start + entry->size,
entry->size);
total_used += entry->size;
if (entry->hole_follows) {
hole_start = drm_mm_hole_node_start(entry);
hole_end = drm_mm_hole_node_end(entry);
hole_size = hole_end - hole_start;
printk(KERN_DEBUG "%s 0x%08lx-0x%08lx: %8lu: free\n",
prefix, hole_start, hole_end,
hole_size);
total_free += hole_size;
}
}
total = total_free + total_used;
printk(KERN_DEBUG "%s total: %lu, used %lu free %lu\n", prefix, total,
total_used, total_free);
}
EXPORT_SYMBOL(drm_mm_debug_table);
#if defined(CONFIG_DEBUG_FS)
int drm_mm_dump_table(struct seq_file *m, struct drm_mm *mm)
{
struct drm_mm_node *entry;
unsigned long total_used = 0, total_free = 0, total = 0;
unsigned long hole_start, hole_end, hole_size;
hole_start = drm_mm_hole_node_start(&mm->head_node);
hole_end = drm_mm_hole_node_end(&mm->head_node);
hole_size = hole_end - hole_start;
if (hole_size)
seq_printf(m, "0x%08lx-0x%08lx: 0x%08lx: free\n",
hole_start, hole_end, hole_size);
total_free += hole_size;
drm_mm_for_each_node(entry, mm) {
seq_printf(m, "0x%08lx-0x%08lx: 0x%08lx: used\n",
entry->start, entry->start + entry->size,
entry->size);
total_used += entry->size;
if (entry->hole_follows) {
hole_start = drm_mm_hole_node_start(entry);
hole_end = drm_mm_hole_node_end(entry);
hole_size = hole_end - hole_start;
seq_printf(m, "0x%08lx-0x%08lx: 0x%08lx: free\n",
hole_start, hole_end, hole_size);
total_free += hole_size;
}
}
total = total_free + total_used;
seq_printf(m, "total: %lu, used %lu free %lu\n", total, total_used, total_free);
return 0;
}
EXPORT_SYMBOL(drm_mm_dump_table);
#endif