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drm/doc: Add function reference documentation for drm_mm.c
While at it do a tiny bit of interface cleanup and convert boolean return values to bool. With this patch all exported functions and inline helpers which are part of the drm_mm public interface are documented. Also drop superflous extern function modifiers since most of drm_mm.h doesn't use them - more consistent that way. Reviewed-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Daniel Vetter
parent
93110be696
commit
e18c04128f
@ -931,6 +931,11 @@ struct drm_gem_object * (*gem_prime_import)(struct drm_device *dev,
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!Pdrivers/gpu/drm/drm_mm.c lru scan roaster
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</sect3>
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</sect2>
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<sect2>
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<title>DRM MM Range Allocator Function References</title>
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!Edrivers/gpu/drm/drm_mm.c
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!Iinclude/drm/drm_mm.h
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</sect2>
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</sect1>
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<!-- Internals: mode setting -->
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@ -144,6 +144,20 @@ static void drm_mm_insert_helper(struct drm_mm_node *hole_node,
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}
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}
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/**
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* drm_mm_reserve_node - insert an pre-initialized node
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* @mm: drm_mm allocator to insert @node into
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* @node: drm_mm_node to insert
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*
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* This functions inserts an already set-up drm_mm_node into the allocator,
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* meaning that start, size and color must be set by the caller. This is useful
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* to initialize the allocator with preallocated objects which must be set-up
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* before the range allocator can be set-up, e.g. when taking over a firmware
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* framebuffer.
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*
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* Returns:
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* 0 on success, -ENOSPC if there's no hole where @node is.
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*/
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int drm_mm_reserve_node(struct drm_mm *mm, struct drm_mm_node *node)
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{
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struct drm_mm_node *hole;
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@ -185,9 +199,18 @@ int drm_mm_reserve_node(struct drm_mm *mm, struct drm_mm_node *node)
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EXPORT_SYMBOL(drm_mm_reserve_node);
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/**
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* Search for free space and insert a preallocated memory node. Returns
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* -ENOSPC if no suitable free area is available. The preallocated memory node
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* must be cleared.
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* drm_mm_insert_node_generic - search for space and insert @node
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* @mm: drm_mm to allocate from
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* @node: preallocate node to insert
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* @size: size of the allocation
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* @alignment: alignment of the allocation
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* @color: opaque tag value to use for this node
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* @flags: flags to fine-tune the allocation
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*
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* The preallocated node must be cleared to 0.
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*
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* Returns:
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* 0 on success, -ENOSPC if there's no suitable hole.
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*/
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int drm_mm_insert_node_generic(struct drm_mm *mm, struct drm_mm_node *node,
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unsigned long size, unsigned alignment,
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@ -259,9 +282,20 @@ static void drm_mm_insert_helper_range(struct drm_mm_node *hole_node,
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}
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/**
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* Search for free space and insert a preallocated memory node. Returns
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* -ENOSPC if no suitable free area is available. This is for range
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* restricted allocations. The preallocated memory node must be cleared.
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* drm_mm_insert_node_in_range_generic - ranged search for space and insert @node
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* @mm: drm_mm to allocate from
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* @node: preallocate node to insert
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* @size: size of the allocation
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* @alignment: alignment of the allocation
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* @color: opaque tag value to use for this node
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* @start: start of the allowed range for this node
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* @end: end of the allowed range for this node
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* @flags: flags to fine-tune the allocation
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*
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* The preallocated node must be cleared to 0.
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*
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* Returns:
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* 0 on success, -ENOSPC if there's no suitable hole.
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*/
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int drm_mm_insert_node_in_range_generic(struct drm_mm *mm, struct drm_mm_node *node,
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unsigned long size, unsigned alignment, unsigned long color,
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@ -284,7 +318,12 @@ int drm_mm_insert_node_in_range_generic(struct drm_mm *mm, struct drm_mm_node *n
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EXPORT_SYMBOL(drm_mm_insert_node_in_range_generic);
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/**
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* Remove a memory node from the allocator.
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* drm_mm_remove_node - Remove a memory node from the allocator.
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* @node: drm_mm_node to remove
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*
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* This just removes a node from its drm_mm allocator. The node does not need to
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* be cleared again before it can be re-inserted into this or any other drm_mm
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* allocator. It is a bug to call this function on a un-allocated node.
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*/
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void drm_mm_remove_node(struct drm_mm_node *node)
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{
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@ -421,7 +460,13 @@ static struct drm_mm_node *drm_mm_search_free_in_range_generic(const struct drm_
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}
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/**
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* Moves an allocation. To be used with embedded struct drm_mm_node.
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* drm_mm_replace_node - move an allocation from @old to @new
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* @old: drm_mm_node to remove from the allocator
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* @new: drm_mm_node which should inherit @old's allocation
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*
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* This is useful for when drivers embed the drm_mm_node structure and hence
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* can't move allocations by reassigning pointers. It's a combination of remove
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* and insert with the guarantee that the allocation start will match.
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*/
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void drm_mm_replace_node(struct drm_mm_node *old, struct drm_mm_node *new)
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{
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@ -467,12 +512,18 @@ EXPORT_SYMBOL(drm_mm_replace_node);
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*/
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/**
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* Initializa lru scanning.
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* drm_mm_init_scan - initialize lru scanning
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* @mm: drm_mm to scan
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* @size: size of the allocation
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* @alignment: alignment of the allocation
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* @color: opaque tag value to use for the allocation
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*
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* This simply sets up the scanning routines with the parameters for the desired
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* hole.
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* hole. Note that there's no need to specify allocation flags, since they only
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* change the place a node is allocated from within a suitable hole.
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*
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* Warning: As long as the scan list is non-empty, no other operations than
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* Warning:
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* As long as the scan list is non-empty, no other operations than
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* adding/removing nodes to/from the scan list are allowed.
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*/
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void drm_mm_init_scan(struct drm_mm *mm,
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@ -492,12 +543,20 @@ void drm_mm_init_scan(struct drm_mm *mm,
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EXPORT_SYMBOL(drm_mm_init_scan);
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/**
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* Initializa lru scanning.
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* drm_mm_init_scan - initialize range-restricted lru scanning
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* @mm: drm_mm to scan
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* @size: size of the allocation
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* @alignment: alignment of the allocation
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* @color: opaque tag value to use for the allocation
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* @start: start of the allowed range for the allocation
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* @end: end of the allowed range for the allocation
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*
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* This simply sets up the scanning routines with the parameters for the desired
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* hole. This version is for range-restricted scans.
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* hole. Note that there's no need to specify allocation flags, since they only
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* change the place a node is allocated from within a suitable hole.
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*
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* Warning: As long as the scan list is non-empty, no other operations than
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* Warning:
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* As long as the scan list is non-empty, no other operations than
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* adding/removing nodes to/from the scan list are allowed.
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*/
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void drm_mm_init_scan_with_range(struct drm_mm *mm,
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@ -521,12 +580,16 @@ void drm_mm_init_scan_with_range(struct drm_mm *mm,
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EXPORT_SYMBOL(drm_mm_init_scan_with_range);
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/**
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* drm_mm_scan_add_block - add a node to the scan list
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* @node: drm_mm_node to add
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*
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* Add a node to the scan list that might be freed to make space for the desired
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* hole.
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*
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* Returns non-zero, if a hole has been found, zero otherwise.
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* Returns:
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* True if a hole has been found, false otherwise.
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*/
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int drm_mm_scan_add_block(struct drm_mm_node *node)
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bool drm_mm_scan_add_block(struct drm_mm_node *node)
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{
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struct drm_mm *mm = node->mm;
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struct drm_mm_node *prev_node;
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@ -566,15 +629,16 @@ int drm_mm_scan_add_block(struct drm_mm_node *node)
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mm->scan_size, mm->scan_alignment)) {
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mm->scan_hit_start = hole_start;
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mm->scan_hit_end = hole_end;
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return 1;
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return true;
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}
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return 0;
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return false;
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}
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EXPORT_SYMBOL(drm_mm_scan_add_block);
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/**
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* Remove a node from the scan list.
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* drm_mm_scan_remove_block - remove a node from the scan list
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* @node: drm_mm_node to remove
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*
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* Nodes _must_ be removed in the exact same order from the scan list as they
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* have been added, otherwise the internal state of the memory manager will be
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@ -584,10 +648,11 @@ EXPORT_SYMBOL(drm_mm_scan_add_block);
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* immediately following drm_mm_search_free with !DRM_MM_SEARCH_BEST will then
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* return the just freed block (because its at the top of the free_stack list).
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*
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* Returns one if this block should be evicted, zero otherwise. Will always
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* return zero when no hole has been found.
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* Returns:
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* True if this block should be evicted, false otherwise. Will always
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* return false when no hole has been found.
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*/
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int drm_mm_scan_remove_block(struct drm_mm_node *node)
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bool drm_mm_scan_remove_block(struct drm_mm_node *node)
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{
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struct drm_mm *mm = node->mm;
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struct drm_mm_node *prev_node;
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@ -608,7 +673,15 @@ int drm_mm_scan_remove_block(struct drm_mm_node *node)
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}
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EXPORT_SYMBOL(drm_mm_scan_remove_block);
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int drm_mm_clean(struct drm_mm * mm)
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/**
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* drm_mm_clean - checks whether an allocator is clean
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* @mm: drm_mm allocator to check
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*
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* Returns:
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* True if the allocator is completely free, false if there's still a node
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* allocated in it.
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*/
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bool drm_mm_clean(struct drm_mm * mm)
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{
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struct list_head *head = &mm->head_node.node_list;
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@ -616,6 +689,14 @@ int drm_mm_clean(struct drm_mm * mm)
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}
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EXPORT_SYMBOL(drm_mm_clean);
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/**
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* drm_mm_init - initialize a drm-mm allocator
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* @mm: the drm_mm structure to initialize
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* @start: start of the range managed by @mm
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* @size: end of the range managed by @mm
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*
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* Note that @mm must be cleared to 0 before calling this function.
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*/
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void drm_mm_init(struct drm_mm * mm, unsigned long start, unsigned long size)
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{
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INIT_LIST_HEAD(&mm->hole_stack);
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@ -637,6 +718,13 @@ void drm_mm_init(struct drm_mm * mm, unsigned long start, unsigned long size)
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}
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EXPORT_SYMBOL(drm_mm_init);
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/**
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* drm_mm_takedown - clean up a drm_mm allocator
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* @mm: drm_mm allocator to clean up
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*
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* Note that it is a bug to call this function on an allocator which is not
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* clean.
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*/
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void drm_mm_takedown(struct drm_mm * mm)
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{
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WARN(!list_empty(&mm->head_node.node_list),
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@ -662,6 +750,11 @@ static unsigned long drm_mm_debug_hole(struct drm_mm_node *entry,
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return 0;
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}
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/**
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* drm_mm_debug_table - dump allocator state to dmesg
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* @mm: drm_mm allocator to dump
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* @prefix: prefix to use for dumping to dmesg
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*/
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void drm_mm_debug_table(struct drm_mm *mm, const char *prefix)
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{
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struct drm_mm_node *entry;
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@ -700,6 +793,11 @@ static unsigned long drm_mm_dump_hole(struct seq_file *m, struct drm_mm_node *en
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return 0;
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}
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/**
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* drm_mm_dump_table - dump allocator state to a seq_file
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* @m: seq_file to dump to
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* @mm: drm_mm allocator to dump
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*/
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int drm_mm_dump_table(struct seq_file *m, struct drm_mm *mm)
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{
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struct drm_mm_node *entry;
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@ -85,11 +85,31 @@ struct drm_mm {
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unsigned long *start, unsigned long *end);
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};
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/**
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* drm_mm_node_allocated - checks whether a node is allocated
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* @node: drm_mm_node to check
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*
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* Drivers should use this helpers for proper encapusulation of drm_mm
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* internals.
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*
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* Returns:
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* True if the @node is allocated.
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*/
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static inline bool drm_mm_node_allocated(struct drm_mm_node *node)
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{
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return node->allocated;
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}
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/**
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* drm_mm_initialized - checks whether an allocator is initialized
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* @mm: drm_mm to check
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*
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* Drivers should use this helpers for proper encapusulation of drm_mm
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* internals.
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*
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* Returns:
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* True if the @mm is initialized.
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*/
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static inline bool drm_mm_initialized(struct drm_mm *mm)
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{
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return mm->hole_stack.next;
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@ -100,6 +120,17 @@ static inline unsigned long __drm_mm_hole_node_start(struct drm_mm_node *hole_no
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return hole_node->start + hole_node->size;
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}
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/**
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* drm_mm_hole_node_start - computes the start of the hole following @node
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* @hole_node: drm_mm_node which implicitly tracks the following hole
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*
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* This is useful for driver-sepific debug dumpers. Otherwise drivers should not
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* inspect holes themselves. Drivers must check first whether a hole indeed
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* follows by looking at node->hole_follows.
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*
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* Returns:
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* Start of the subsequent hole.
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*/
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static inline unsigned long drm_mm_hole_node_start(struct drm_mm_node *hole_node)
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{
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BUG_ON(!hole_node->hole_follows);
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@ -112,18 +143,49 @@ static inline unsigned long __drm_mm_hole_node_end(struct drm_mm_node *hole_node
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struct drm_mm_node, node_list)->start;
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}
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/**
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* drm_mm_hole_node_end - computes the end of the hole following @node
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* @hole_node: drm_mm_node which implicitly tracks the following hole
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*
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* This is useful for driver-sepific debug dumpers. Otherwise drivers should not
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* inspect holes themselves. Drivers must check first whether a hole indeed
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* follows by looking at node->hole_follows.
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*
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* Returns:
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* End of the subsequent hole.
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*/
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static inline unsigned long drm_mm_hole_node_end(struct drm_mm_node *hole_node)
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{
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return __drm_mm_hole_node_end(hole_node);
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}
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/**
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* drm_mm_for_each_node - iterator to walk over all allocated nodes
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* @entry: drm_mm_node structure to assign to in each iteration step
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* @mm: drm_mm allocator to walk
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*
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* This iterator walks over all nodes in the range allocator. It is implemented
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* with list_for_each, so not save against removal of elements.
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*/
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#define drm_mm_for_each_node(entry, mm) list_for_each_entry(entry, \
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&(mm)->head_node.node_list, \
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node_list)
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/* Note that we need to unroll list_for_each_entry in order to inline
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* setting hole_start and hole_end on each iteration and keep the
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* macro sane.
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/**
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* drm_mm_for_each_hole - iterator to walk over all holes
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* @entry: drm_mm_node used internally to track progress
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* @mm: drm_mm allocator to walk
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* @hole_start: ulong variable to assign the hole start to on each iteration
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* @hole_end: ulong variable to assign the hole end to on each iteration
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*
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* This iterator walks over all holes in the range allocator. It is implemented
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* with list_for_each, so not save against removal of elements. @entry is used
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* internally and will not reflect a real drm_mm_node for the very first hole.
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* Hence users of this iterator may not access it.
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*
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* Implementation Note:
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* We need to inline list_for_each_entry in order to be able to set hole_start
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* and hole_end on each iteration while keeping the macro sane.
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*/
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#define drm_mm_for_each_hole(entry, mm, hole_start, hole_end) \
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for (entry = list_entry((mm)->hole_stack.next, struct drm_mm_node, hole_stack); \
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@ -136,14 +198,30 @@ static inline unsigned long drm_mm_hole_node_end(struct drm_mm_node *hole_node)
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/*
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* Basic range manager support (drm_mm.c)
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*/
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extern int drm_mm_reserve_node(struct drm_mm *mm, struct drm_mm_node *node);
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int drm_mm_reserve_node(struct drm_mm *mm, struct drm_mm_node *node);
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extern int drm_mm_insert_node_generic(struct drm_mm *mm,
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struct drm_mm_node *node,
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unsigned long size,
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unsigned alignment,
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unsigned long color,
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enum drm_mm_search_flags flags);
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int drm_mm_insert_node_generic(struct drm_mm *mm,
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struct drm_mm_node *node,
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unsigned long size,
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unsigned alignment,
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unsigned long color,
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enum drm_mm_search_flags flags);
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/**
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* drm_mm_insert_node - search for space and insert @node
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* @mm: drm_mm to allocate from
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* @node: preallocate node to insert
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* @size: size of the allocation
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* @alignment: alignment of the allocation
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* @flags: flags to fine-tune the allocation
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*
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* This is a simplified version of drm_mm_insert_node_generic() with @color set
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* to 0.
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*
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* The preallocated node must be cleared to 0.
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*
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* Returns:
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* 0 on success, -ENOSPC if there's no suitable hole.
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*/
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static inline int drm_mm_insert_node(struct drm_mm *mm,
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struct drm_mm_node *node,
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unsigned long size,
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@ -153,14 +231,32 @@ static inline int drm_mm_insert_node(struct drm_mm *mm,
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return drm_mm_insert_node_generic(mm, node, size, alignment, 0, flags);
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}
|
||||
|
||||
extern 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,
|
||||
enum drm_mm_search_flags flags);
|
||||
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,
|
||||
enum drm_mm_search_flags flags);
|
||||
/**
|
||||
* 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,
|
||||
unsigned long size,
|
||||
@ -173,13 +269,13 @@ static inline int drm_mm_insert_node_in_range(struct drm_mm *mm,
|
||||
0, start, end, flags);
|
||||
}
|
||||
|
||||
extern void drm_mm_remove_node(struct drm_mm_node *node);
|
||||
extern void drm_mm_replace_node(struct drm_mm_node *old, struct drm_mm_node *new);
|
||||
extern void drm_mm_init(struct drm_mm *mm,
|
||||
unsigned long start,
|
||||
unsigned long size);
|
||||
extern void drm_mm_takedown(struct drm_mm *mm);
|
||||
extern int drm_mm_clean(struct drm_mm *mm);
|
||||
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,
|
||||
unsigned long start,
|
||||
unsigned long 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,
|
||||
unsigned long size,
|
||||
@ -191,10 +287,10 @@ void drm_mm_init_scan_with_range(struct drm_mm *mm,
|
||||
unsigned long color,
|
||||
unsigned long start,
|
||||
unsigned long end);
|
||||
int drm_mm_scan_add_block(struct drm_mm_node *node);
|
||||
int drm_mm_scan_remove_block(struct drm_mm_node *node);
|
||||
bool drm_mm_scan_add_block(struct drm_mm_node *node);
|
||||
bool drm_mm_scan_remove_block(struct drm_mm_node *node);
|
||||
|
||||
extern void drm_mm_debug_table(struct drm_mm *mm, const char *prefix);
|
||||
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
|
||||
|
||||
Loading…
Reference in New Issue
Block a user