[PATCH v4 1/2] drm: Improve drm_mm search (and fix topdown allocation) with rbtrees
Alex Deucher
alexdeucher at gmail.com
Thu Feb 2 14:55:59 UTC 2017
On Thu, Feb 2, 2017 at 6:44 AM, Chris Wilson <chris at chris-wilson.co.uk> wrote:
> The drm_mm range manager claimed to support top-down insertion, but it
> was neither searching for the top-most hole that could fit the
> allocation request nor fitting the request to the hole correctly.
>
> In order to search the range efficiently, we create a secondary index
> for the holes using either their size or their address. This index
> allows us to find the smallest hole or the hole at the bottom or top of
> the range efficiently, whilst keeping the hole stack to rapidly service
> evictions.
>
> v2: Search for holes both high and low. Rename flags to mode.
> v3: Discover rb_entry_safe() and use it!
> v4: Kerneldoc for enum drm_mm_insert_mode.
>
I haven't had drm_mm.c paged into my head in a while, but the patch
appears to do the right thing. The series is:
Reviewed-by: Alex Deucher <alexander.deucher at amd.com>
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> Reviewed-by: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
> Cc: Alex Deucher <alexander.deucher at amd.com>
> Cc: "Christian König" <christian.koenig at amd.com>
> Cc: David Airlie <airlied at linux.ie>
> Cc: Russell King <rmk+kernel at armlinux.org.uk>
> Cc: Daniel Vetter <daniel.vetter at intel.com>
> Cc: Jani Nikula <jani.nikula at linux.intel.com>
> Cc: Sean Paul <seanpaul at chromium.org>
> Cc: Lucas Stach <l.stach at pengutronix.de>
> Cc: Christian Gmeiner <christian.gmeiner at gmail.com>
> Cc: Rob Clark <robdclark at gmail.com>
> Cc: Thierry Reding <thierry.reding at gmail.com>
> Cc: Stephen Warren <swarren at wwwdotorg.org>
> Cc: Alexandre Courbot <gnurou at gmail.com>
> Cc: Eric Anholt <eric at anholt.net>
> Cc: Sinclair Yeh <syeh at vmware.com>
> Cc: Thomas Hellstrom <thellstrom at vmware.com>
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c | 16 +-
> drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c | 20 +-
> drivers/gpu/drm/armada/armada_gem.c | 4 +-
> drivers/gpu/drm/drm_mm.c | 488 +++++++++++++++------------
> drivers/gpu/drm/drm_vma_manager.c | 3 +-
> drivers/gpu/drm/etnaviv/etnaviv_mmu.c | 16 +-
> drivers/gpu/drm/i915/i915_gem.c | 10 +-
> drivers/gpu/drm/i915/i915_gem_evict.c | 9 +-
> drivers/gpu/drm/i915/i915_gem_execbuffer.c | 5 +-
> drivers/gpu/drm/i915/i915_gem_gtt.c | 39 +--
> drivers/gpu/drm/i915/i915_gem_stolen.c | 6 +-
> drivers/gpu/drm/msm/msm_gem.c | 3 +-
> drivers/gpu/drm/msm/msm_gem_vma.c | 3 +-
> drivers/gpu/drm/selftests/test-drm_mm.c | 58 ++--
> drivers/gpu/drm/sis/sis_mm.c | 6 +-
> drivers/gpu/drm/tegra/gem.c | 4 +-
> drivers/gpu/drm/ttm/ttm_bo_manager.c | 18 +-
> drivers/gpu/drm/vc4/vc4_crtc.c | 2 +-
> drivers/gpu/drm/vc4/vc4_hvs.c | 3 +-
> drivers/gpu/drm/vc4/vc4_plane.c | 6 +-
> drivers/gpu/drm/via/via_mm.c | 4 +-
> drivers/gpu/drm/vmwgfx/vmwgfx_cmdbuf.c | 10 +-
> include/drm/drm_mm.h | 184 +++++-----
> 23 files changed, 470 insertions(+), 447 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c
> index e4eb6dd3798a..0335c2f331e9 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c
> @@ -97,8 +97,7 @@ int amdgpu_gtt_mgr_alloc(struct ttm_mem_type_manager *man,
> {
> struct amdgpu_gtt_mgr *mgr = man->priv;
> struct drm_mm_node *node = mem->mm_node;
> - enum drm_mm_search_flags sflags = DRM_MM_SEARCH_BEST;
> - enum drm_mm_allocator_flags aflags = DRM_MM_CREATE_DEFAULT;
> + enum drm_mm_insert_mode mode;
> unsigned long fpfn, lpfn;
> int r;
>
> @@ -115,15 +114,14 @@ int amdgpu_gtt_mgr_alloc(struct ttm_mem_type_manager *man,
> else
> lpfn = man->size;
>
> - if (place && place->flags & TTM_PL_FLAG_TOPDOWN) {
> - sflags = DRM_MM_SEARCH_BELOW;
> - aflags = DRM_MM_CREATE_TOP;
> - }
> + mode = DRM_MM_INSERT_BEST;
> + if (place && place->flags & TTM_PL_FLAG_TOPDOWN)
> + mode = DRM_MM_INSERT_HIGH;
>
> spin_lock(&mgr->lock);
> - r = drm_mm_insert_node_in_range_generic(&mgr->mm, node, mem->num_pages,
> - mem->page_alignment, 0,
> - fpfn, lpfn, sflags, aflags);
> + r = drm_mm_insert_node_in_range(&mgr->mm, node,
> + mem->num_pages, mem->page_alignment, 0,
> + fpfn, lpfn, mode);
> spin_unlock(&mgr->lock);
>
> if (!r) {
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
> index ac9007986c11..9e577e3d3147 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
> @@ -97,8 +97,7 @@ static int amdgpu_vram_mgr_new(struct ttm_mem_type_manager *man,
> struct amdgpu_vram_mgr *mgr = man->priv;
> struct drm_mm *mm = &mgr->mm;
> struct drm_mm_node *nodes;
> - enum drm_mm_search_flags sflags = DRM_MM_SEARCH_DEFAULT;
> - enum drm_mm_allocator_flags aflags = DRM_MM_CREATE_DEFAULT;
> + enum drm_mm_insert_mode mode;
> unsigned long lpfn, num_nodes, pages_per_node, pages_left;
> unsigned i;
> int r;
> @@ -121,10 +120,9 @@ static int amdgpu_vram_mgr_new(struct ttm_mem_type_manager *man,
> if (!nodes)
> return -ENOMEM;
>
> - if (place->flags & TTM_PL_FLAG_TOPDOWN) {
> - sflags = DRM_MM_SEARCH_BELOW;
> - aflags = DRM_MM_CREATE_TOP;
> - }
> + mode = DRM_MM_INSERT_BEST;
> + if (place->flags & TTM_PL_FLAG_TOPDOWN)
> + mode = DRM_MM_INSERT_HIGH;
>
> pages_left = mem->num_pages;
>
> @@ -135,13 +133,11 @@ static int amdgpu_vram_mgr_new(struct ttm_mem_type_manager *man,
>
> if (pages == pages_per_node)
> alignment = pages_per_node;
> - else
> - sflags |= DRM_MM_SEARCH_BEST;
>
> - r = drm_mm_insert_node_in_range_generic(mm, &nodes[i], pages,
> - alignment, 0,
> - place->fpfn, lpfn,
> - sflags, aflags);
> + r = drm_mm_insert_node_in_range(mm, &nodes[i],
> + pages, alignment, 0,
> + place->fpfn, lpfn,
> + mode);
> if (unlikely(r))
> goto error;
>
> diff --git a/drivers/gpu/drm/armada/armada_gem.c b/drivers/gpu/drm/armada/armada_gem.c
> index a293c8be232c..560d416deab2 100644
> --- a/drivers/gpu/drm/armada/armada_gem.c
> +++ b/drivers/gpu/drm/armada/armada_gem.c
> @@ -148,8 +148,8 @@ armada_gem_linear_back(struct drm_device *dev, struct armada_gem_object *obj)
> return -ENOSPC;
>
> mutex_lock(&priv->linear_lock);
> - ret = drm_mm_insert_node(&priv->linear, node, size, align,
> - DRM_MM_SEARCH_DEFAULT);
> + ret = drm_mm_insert_node_generic(&priv->linear, node,
> + size, align, 0, 0);
> mutex_unlock(&priv->linear_lock);
> if (ret) {
> kfree(node);
> diff --git a/drivers/gpu/drm/drm_mm.c b/drivers/gpu/drm/drm_mm.c
> index e51876e588d6..8bfb0b327267 100644
> --- a/drivers/gpu/drm/drm_mm.c
> +++ b/drivers/gpu/drm/drm_mm.c
> @@ -97,14 +97,6 @@
> * locking would be fully redundant.
> */
>
> -static struct drm_mm_node *drm_mm_search_free_in_range_generic(const struct drm_mm *mm,
> - u64 size,
> - u64 alignment,
> - unsigned long color,
> - u64 start,
> - u64 end,
> - enum drm_mm_search_flags flags);
> -
> #ifdef CONFIG_DRM_DEBUG_MM
> #include <linux/stackdepot.h>
>
> @@ -226,69 +218,151 @@ static void drm_mm_interval_tree_add_node(struct drm_mm_node *hole_node,
> &drm_mm_interval_tree_augment);
> }
>
> -static void drm_mm_insert_helper(struct drm_mm_node *hole_node,
> - struct drm_mm_node *node,
> - u64 size, u64 alignment,
> - unsigned long color,
> - u64 range_start, u64 range_end,
> - enum drm_mm_allocator_flags flags)
> +#define RB_INSERT(root, member, expr) do { \
> + struct rb_node **link = &root.rb_node, *rb = NULL; \
> + u64 x = expr(node); \
> + while (*link) { \
> + rb = *link; \
> + if (x < expr(rb_entry(rb, struct drm_mm_node, member))) \
> + link = &rb->rb_left; \
> + else \
> + link = &rb->rb_right; \
> + } \
> + rb_link_node(&node->member, rb, link); \
> + rb_insert_color(&node->member, &root); \
> +} while (0)
> +
> +#define HOLE_SIZE(NODE) ((NODE)->hole_size)
> +#define HOLE_ADDR(NODE) (__drm_mm_hole_node_start(NODE))
> +
> +static void add_hole(struct drm_mm_node *node)
> {
> - struct drm_mm *mm = hole_node->mm;
> - u64 hole_start = drm_mm_hole_node_start(hole_node);
> - u64 hole_end = drm_mm_hole_node_end(hole_node);
> - u64 adj_start = hole_start;
> - u64 adj_end = hole_end;
> + struct drm_mm *mm = node->mm;
>
> - DRM_MM_BUG_ON(!drm_mm_hole_follows(hole_node) || node->allocated);
> + node->hole_size =
> + __drm_mm_hole_node_end(node) - __drm_mm_hole_node_start(node);
> + DRM_MM_BUG_ON(!drm_mm_hole_follows(node));
>
> - if (mm->color_adjust)
> - mm->color_adjust(hole_node, color, &adj_start, &adj_end);
> + RB_INSERT(mm->holes_size, rb_hole_size, HOLE_SIZE);
> + RB_INSERT(mm->holes_addr, rb_hole_addr, HOLE_ADDR);
>
> - adj_start = max(adj_start, range_start);
> - adj_end = min(adj_end, range_end);
> + list_add(&node->hole_stack, &mm->hole_stack);
> +}
>
> - if (flags & DRM_MM_CREATE_TOP)
> - adj_start = adj_end - size;
> +static void rm_hole(struct drm_mm_node *node)
> +{
> + DRM_MM_BUG_ON(!drm_mm_hole_follows(node));
>
> - if (alignment) {
> - u64 rem;
> + list_del(&node->hole_stack);
> + rb_erase(&node->rb_hole_size, &node->mm->holes_size);
> + rb_erase(&node->rb_hole_addr, &node->mm->holes_addr);
> + node->hole_size = 0;
>
> - div64_u64_rem(adj_start, alignment, &rem);
> - if (rem) {
> - if (flags & DRM_MM_CREATE_TOP)
> - adj_start -= rem;
> - else
> - adj_start += alignment - rem;
> + DRM_MM_BUG_ON(drm_mm_hole_follows(node));
> +}
> +
> +static inline struct drm_mm_node *rb_hole_size_to_node(struct rb_node *rb)
> +{
> + return rb_entry_safe(rb, struct drm_mm_node, rb_hole_size);
> +}
> +
> +static inline struct drm_mm_node *rb_hole_addr_to_node(struct rb_node *rb)
> +{
> + return rb_entry_safe(rb, struct drm_mm_node, rb_hole_addr);
> +}
> +
> +static inline u64 rb_hole_size(struct rb_node *rb)
> +{
> + return rb_entry(rb, struct drm_mm_node, rb_hole_size)->hole_size;
> +}
> +
> +static struct drm_mm_node *best_hole(struct drm_mm *mm, u64 size)
> +{
> + struct rb_node *best = NULL;
> + struct rb_node **link = &mm->holes_size.rb_node;
> +
> + while (*link) {
> + struct rb_node *rb = *link;
> +
> + if (size <= rb_hole_size(rb)) {
> + link = &rb->rb_left;
> + best = rb;
> + } else {
> + link = &rb->rb_right;
> }
> }
>
> - if (adj_start == hole_start) {
> - hole_node->hole_follows = 0;
> - list_del(&hole_node->hole_stack);
> + return rb_hole_size_to_node(best);
> +}
> +
> +static struct drm_mm_node *find_hole(struct drm_mm *mm, u64 addr)
> +{
> + struct drm_mm_node *node = NULL;
> + struct rb_node **link = &mm->holes_addr.rb_node;
> +
> + while (*link) {
> + u64 hole_start;
> +
> + node = rb_hole_addr_to_node(*link);
> + hole_start = __drm_mm_hole_node_start(node);
> +
> + if (addr < hole_start)
> + link = &node->rb_hole_addr.rb_left;
> + else if (addr > hole_start + node->hole_size)
> + link = &node->rb_hole_addr.rb_right;
> + else
> + break;
> }
>
> - node->start = adj_start;
> - node->size = size;
> - node->mm = mm;
> - node->color = color;
> - node->allocated = 1;
> + return node;
> +}
>
> - list_add(&node->node_list, &hole_node->node_list);
> +static struct drm_mm_node *
> +first_hole(struct drm_mm *mm,
> + u64 start, u64 end, u64 size,
> + enum drm_mm_insert_mode mode)
> +{
> + if (RB_EMPTY_ROOT(&mm->holes_size))
> + return NULL;
>
> - drm_mm_interval_tree_add_node(hole_node, node);
> + switch (mode) {
> + default:
> + case DRM_MM_INSERT_BEST:
> + return best_hole(mm, size);
>
> - DRM_MM_BUG_ON(node->start < range_start);
> - DRM_MM_BUG_ON(node->start < adj_start);
> - DRM_MM_BUG_ON(node->start + node->size > adj_end);
> - DRM_MM_BUG_ON(node->start + node->size > range_end);
> + case DRM_MM_INSERT_LOW:
> + return find_hole(mm, start);
>
> - 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;
> + case DRM_MM_INSERT_HIGH:
> + return find_hole(mm, end);
> +
> + case DRM_MM_INSERT_EVICT:
> + return list_first_entry_or_null(&mm->hole_stack,
> + struct drm_mm_node,
> + hole_stack);
> }
> +}
>
> - save_stack(node);
> +static struct drm_mm_node *
> +next_hole(struct drm_mm *mm,
> + struct drm_mm_node *node,
> + enum drm_mm_insert_mode mode)
> +{
> + switch (mode) {
> + default:
> + case DRM_MM_INSERT_BEST:
> + return rb_hole_size_to_node(rb_next(&node->rb_hole_size));
> +
> + case DRM_MM_INSERT_LOW:
> + return rb_hole_addr_to_node(rb_next(&node->rb_hole_addr));
> +
> + case DRM_MM_INSERT_HIGH:
> + return rb_hole_addr_to_node(rb_prev(&node->rb_hole_addr));
> +
> + case DRM_MM_INSERT_EVICT:
> + node = list_next_entry(node, hole_stack);
> + return &node->hole_stack == &mm->hole_stack ? NULL : node;
> + }
> }
>
> /**
> @@ -317,21 +391,12 @@ int drm_mm_reserve_node(struct drm_mm *mm, struct drm_mm_node *node)
> return -ENOSPC;
>
> /* Find the relevant hole to add our node to */
> - hole = drm_mm_interval_tree_iter_first(&mm->interval_tree,
> - node->start, ~(u64)0);
> - if (hole) {
> - if (hole->start < end)
> - return -ENOSPC;
> - } else {
> - hole = list_entry(drm_mm_nodes(mm), typeof(*hole), node_list);
> - }
> -
> - hole = list_last_entry(&hole->node_list, typeof(*hole), node_list);
> - if (!drm_mm_hole_follows(hole))
> + hole = find_hole(mm, node->start);
> + if (!hole)
> return -ENOSPC;
>
> adj_start = hole_start = __drm_mm_hole_node_start(hole);
> - adj_end = hole_end = __drm_mm_hole_node_end(hole);
> + adj_end = hole_end = hole_start + hole->hole_size;
>
> if (mm->color_adjust)
> mm->color_adjust(hole, node->color, &adj_start, &adj_end);
> @@ -340,70 +405,130 @@ int drm_mm_reserve_node(struct drm_mm *mm, struct drm_mm_node *node)
> return -ENOSPC;
>
> node->mm = mm;
> - node->allocated = 1;
>
> list_add(&node->node_list, &hole->node_list);
> -
> drm_mm_interval_tree_add_node(hole, node);
> + node->allocated = true;
> + node->hole_size = 0;
>
> - if (node->start == hole_start) {
> - hole->hole_follows = 0;
> - list_del(&hole->hole_stack);
> - }
> -
> - node->hole_follows = 0;
> - if (end != hole_end) {
> - list_add(&node->hole_stack, &mm->hole_stack);
> - node->hole_follows = 1;
> - }
> + rm_hole(hole);
> + if (node->start > hole_start)
> + add_hole(hole);
> + if (end < hole_end)
> + add_hole(node);
>
> save_stack(node);
> -
> return 0;
> }
> EXPORT_SYMBOL(drm_mm_reserve_node);
>
> /**
> - * drm_mm_insert_node_in_range_generic - ranged search for space and insert @node
> + * 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
> * @color: opaque tag value to use for this node
> - * @start: start of the allowed range for this node
> - * @end: end of the allowed range for this node
> - * @sflags: flags to fine-tune the allocation search
> - * @aflags: flags to fine-tune the allocation behavior
> + * @range_start: start of the allowed range for this node
> + * @range_end: end of the allowed range for this node
> + * @mode: fine-tune the allocation search and placement
> *
> * The preallocated @node must be cleared to 0.
> *
> * Returns:
> * 0 on success, -ENOSPC if there's no suitable hole.
> */
> -int drm_mm_insert_node_in_range_generic(struct drm_mm *mm, struct drm_mm_node *node,
> - u64 size, u64 alignment,
> - unsigned long color,
> - u64 start, u64 end,
> - enum drm_mm_search_flags sflags,
> - enum drm_mm_allocator_flags aflags)
> +int drm_mm_insert_node_in_range(struct drm_mm * const mm,
> + struct drm_mm_node * const node,
> + u64 size, u64 alignment,
> + unsigned long color,
> + u64 range_start, u64 range_end,
> + enum drm_mm_insert_mode mode)
> {
> - struct drm_mm_node *hole_node;
> + struct drm_mm_node *hole;
> + u64 remainder_mask;
>
> - if (WARN_ON(size == 0))
> - return -EINVAL;
> + DRM_MM_BUG_ON(range_start >= range_end);
>
> - hole_node = drm_mm_search_free_in_range_generic(mm,
> - size, alignment, color,
> - start, end, sflags);
> - if (!hole_node)
> + if (unlikely(size == 0 || range_end - range_start < size))
> return -ENOSPC;
>
> - drm_mm_insert_helper(hole_node, node,
> - size, alignment, color,
> - start, end, aflags);
> - return 0;
> + if (alignment <= 1)
> + alignment = 0;
> +
> + remainder_mask = is_power_of_2(alignment) ? alignment - 1 : 0;
> + for (hole = first_hole(mm, range_start, range_end, size, mode); hole;
> + hole = next_hole(mm, hole, mode)) {
> + u64 hole_start = __drm_mm_hole_node_start(hole);
> + u64 hole_end = hole_start + hole->hole_size;
> + u64 adj_start, adj_end;
> + u64 col_start, col_end;
> +
> + if (mode == DRM_MM_INSERT_LOW && hole_start >= range_end)
> + break;
> +
> + if (mode == DRM_MM_INSERT_HIGH && hole_end <= range_start)
> + break;
> +
> + col_start = hole_start;
> + col_end = hole_end;
> + if (mm->color_adjust)
> + mm->color_adjust(hole, color, &col_start, &col_end);
> +
> + adj_start = max(col_start, range_start);
> + adj_end = min(col_end, range_end);
> +
> + if (adj_end <= adj_start || adj_end - adj_start < size)
> + continue;
> +
> + if (mode == DRM_MM_INSERT_HIGH)
> + adj_start = adj_end - size;
> +
> + if (alignment) {
> + u64 rem;
> +
> + if (likely(remainder_mask))
> + rem = adj_start & remainder_mask;
> + else
> + div64_u64_rem(adj_start, alignment, &rem);
> + if (rem) {
> + adj_start -= rem;
> + if (mode != DRM_MM_INSERT_HIGH)
> + adj_start += alignment;
> +
> + if (adj_start < max(col_start, range_start) ||
> + min(col_end, range_end) - adj_start < size)
> + continue;
> +
> + if (adj_end <= adj_start ||
> + adj_end - adj_start < size)
> + continue;
> + }
> + }
> +
> + node->mm = mm;
> + node->size = size;
> + node->start = adj_start;
> + node->color = color;
> + node->hole_size = 0;
> +
> + list_add(&node->node_list, &hole->node_list);
> + drm_mm_interval_tree_add_node(hole, node);
> + node->allocated = true;
> +
> + rm_hole(hole);
> + if (adj_start > hole_start)
> + add_hole(hole);
> + if (adj_start + size < hole_end)
> + add_hole(node);
> +
> + save_stack(node);
> + return 0;
> + }
> +
> + return -ENOSPC;
> }
> -EXPORT_SYMBOL(drm_mm_insert_node_in_range_generic);
> +EXPORT_SYMBOL(drm_mm_insert_node_in_range);
>
> /**
> * drm_mm_remove_node - Remove a memory node from the allocator.
> @@ -421,92 +546,20 @@ void drm_mm_remove_node(struct drm_mm_node *node)
> DRM_MM_BUG_ON(!node->allocated);
> DRM_MM_BUG_ON(node->scanned_block);
>
> - prev_node =
> - list_entry(node->node_list.prev, struct drm_mm_node, node_list);
> -
> - if (drm_mm_hole_follows(node)) {
> - DRM_MM_BUG_ON(__drm_mm_hole_node_start(node) ==
> - __drm_mm_hole_node_end(node));
> - list_del(&node->hole_stack);
> - } else {
> - DRM_MM_BUG_ON(__drm_mm_hole_node_start(node) !=
> - __drm_mm_hole_node_end(node));
> - }
> + prev_node = list_prev_entry(node, node_list);
>
> - if (!drm_mm_hole_follows(prev_node)) {
> - prev_node->hole_follows = 1;
> - list_add(&prev_node->hole_stack, &mm->hole_stack);
> - } else
> - list_move(&prev_node->hole_stack, &mm->hole_stack);
> + if (drm_mm_hole_follows(node))
> + rm_hole(node);
>
> drm_mm_interval_tree_remove(node, &mm->interval_tree);
> list_del(&node->node_list);
> - node->allocated = 0;
> -}
> -EXPORT_SYMBOL(drm_mm_remove_node);
> -
> -static int check_free_hole(u64 start, u64 end, u64 size, u64 alignment)
> -{
> - if (end - start < size)
> - return 0;
> -
> - if (alignment) {
> - u64 rem;
> -
> - div64_u64_rem(start, alignment, &rem);
> - if (rem)
> - start += alignment - rem;
> - }
> + node->allocated = false;
>
> - return end >= start + size;
> -}
> -
> -static struct drm_mm_node *drm_mm_search_free_in_range_generic(const struct drm_mm *mm,
> - u64 size,
> - u64 alignment,
> - unsigned long color,
> - u64 start,
> - u64 end,
> - enum drm_mm_search_flags flags)
> -{
> - struct drm_mm_node *entry;
> - struct drm_mm_node *best;
> - u64 adj_start;
> - u64 adj_end;
> - u64 best_size;
> -
> - DRM_MM_BUG_ON(mm->scan_active);
> -
> - best = NULL;
> - best_size = ~0UL;
> -
> - __drm_mm_for_each_hole(entry, mm, adj_start, adj_end,
> - flags & DRM_MM_SEARCH_BELOW) {
> - u64 hole_size = adj_end - adj_start;
> -
> - if (mm->color_adjust) {
> - mm->color_adjust(entry, color, &adj_start, &adj_end);
> - if (adj_end <= adj_start)
> - continue;
> - }
> -
> - adj_start = max(adj_start, start);
> - adj_end = min(adj_end, end);
> -
> - if (!check_free_hole(adj_start, adj_end, size, alignment))
> - continue;
> -
> - if (!(flags & DRM_MM_SEARCH_BEST))
> - return entry;
> -
> - if (hole_size < best_size) {
> - best = entry;
> - best_size = hole_size;
> - }
> - }
> -
> - return best;
> + if (drm_mm_hole_follows(prev_node))
> + rm_hole(prev_node);
> + add_hole(prev_node);
> }
> +EXPORT_SYMBOL(drm_mm_remove_node);
>
> /**
> * drm_mm_replace_node - move an allocation from @old to @new
> @@ -521,18 +574,23 @@ void drm_mm_replace_node(struct drm_mm_node *old, struct drm_mm_node *new)
> {
> DRM_MM_BUG_ON(!old->allocated);
>
> + *new = *old;
> +
> list_replace(&old->node_list, &new->node_list);
> - list_replace(&old->hole_stack, &new->hole_stack);
> rb_replace_node(&old->rb, &new->rb, &old->mm->interval_tree);
> - new->hole_follows = old->hole_follows;
> - new->mm = old->mm;
> - new->start = old->start;
> - new->size = old->size;
> - new->color = old->color;
> - new->__subtree_last = old->__subtree_last;
> -
> - old->allocated = 0;
> - new->allocated = 1;
> +
> + if (drm_mm_hole_follows(old)) {
> + list_replace(&old->hole_stack, &new->hole_stack);
> + rb_replace_node(&old->rb_hole_size,
> + &new->rb_hole_size,
> + &old->mm->holes_size);
> + rb_replace_node(&old->rb_hole_addr,
> + &new->rb_hole_addr,
> + &old->mm->holes_addr);
> + }
> +
> + old->allocated = false;
> + new->allocated = true;
> }
> EXPORT_SYMBOL(drm_mm_replace_node);
>
> @@ -577,7 +635,7 @@ EXPORT_SYMBOL(drm_mm_replace_node);
> * @color: opaque tag value to use for the allocation
> * @start: start of the allowed range for the allocation
> * @end: end of the allowed range for the allocation
> - * @flags: flags to specify how the allocation will be performed afterwards
> + * @mode: fine-tune the allocation search and placement
> *
> * This simply sets up the scanning routines with the parameters for the desired
> * hole.
> @@ -593,7 +651,7 @@ void drm_mm_scan_init_with_range(struct drm_mm_scan *scan,
> unsigned long color,
> u64 start,
> u64 end,
> - unsigned int flags)
> + enum drm_mm_insert_mode mode)
> {
> DRM_MM_BUG_ON(start >= end);
> DRM_MM_BUG_ON(!size || size > end - start);
> @@ -608,7 +666,7 @@ void drm_mm_scan_init_with_range(struct drm_mm_scan *scan,
> scan->alignment = alignment;
> scan->remainder_mask = is_power_of_2(alignment) ? alignment - 1 : 0;
> scan->size = size;
> - scan->flags = flags;
> + scan->mode = mode;
>
> DRM_MM_BUG_ON(end <= start);
> scan->range_start = start;
> @@ -667,7 +725,7 @@ bool drm_mm_scan_add_block(struct drm_mm_scan *scan,
> if (adj_end <= adj_start || adj_end - adj_start < scan->size)
> return false;
>
> - if (scan->flags == DRM_MM_CREATE_TOP)
> + if (scan->mode == DRM_MM_INSERT_HIGH)
> adj_start = adj_end - scan->size;
>
> if (scan->alignment) {
> @@ -679,7 +737,7 @@ bool drm_mm_scan_add_block(struct drm_mm_scan *scan,
> div64_u64_rem(adj_start, scan->alignment, &rem);
> if (rem) {
> adj_start -= rem;
> - if (scan->flags != DRM_MM_CREATE_TOP)
> + if (scan->mode != DRM_MM_INSERT_HIGH)
> adj_start += scan->alignment;
> if (adj_start < max(col_start, scan->range_start) ||
> min(col_end, scan->range_end) - adj_start < scan->size)
> @@ -775,7 +833,7 @@ struct drm_mm_node *drm_mm_scan_color_evict(struct drm_mm_scan *scan)
>
> hole = list_first_entry(&mm->hole_stack, typeof(*hole), hole_stack);
> hole_start = __drm_mm_hole_node_start(hole);
> - hole_end = __drm_mm_hole_node_end(hole);
> + hole_end = hole_start + hole->hole_size;
>
> DRM_MM_BUG_ON(hole_start > scan->hit_start);
> DRM_MM_BUG_ON(hole_end < scan->hit_end);
> @@ -802,21 +860,22 @@ void drm_mm_init(struct drm_mm *mm, u64 start, u64 size)
> {
> DRM_MM_BUG_ON(start + size <= start);
>
> + mm->color_adjust = NULL;
> +
> INIT_LIST_HEAD(&mm->hole_stack);
> - mm->scan_active = 0;
> + mm->interval_tree = RB_ROOT;
> + mm->holes_size = RB_ROOT;
> + mm->holes_addr = RB_ROOT;
>
> /* Clever trick to avoid a special case in the free hole tracking. */
> INIT_LIST_HEAD(&mm->head_node.node_list);
> - mm->head_node.allocated = 0;
> - mm->head_node.hole_follows = 1;
> + mm->head_node.allocated = false;
> 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->head_node.size = -size;
> + add_hole(&mm->head_node);
>
> - mm->interval_tree = RB_ROOT;
> -
> - mm->color_adjust = NULL;
> + mm->scan_active = 0;
> }
> EXPORT_SYMBOL(drm_mm_init);
>
> @@ -837,20 +896,17 @@ EXPORT_SYMBOL(drm_mm_takedown);
>
> static u64 drm_mm_dump_hole(struct drm_printer *p, const struct drm_mm_node *entry)
> {
> - u64 hole_start, hole_end, hole_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;
> - drm_printf(p, "%#018llx-%#018llx: %llu: free\n", hole_start,
> - hole_end, hole_size);
> - return hole_size;
> + u64 start, size;
> +
> + size = entry->hole_size;
> + if (size) {
> + start = drm_mm_hole_node_start(entry);
> + drm_printf(p, "%#018llx-%#018llx: %llu: free\n",
> + start, start + size, size);
> }
>
> - return 0;
> + return size;
> }
> -
> /**
> * drm_mm_print - print allocator state
> * @mm: drm_mm allocator to print
> diff --git a/drivers/gpu/drm/drm_vma_manager.c b/drivers/gpu/drm/drm_vma_manager.c
> index 20cc33d1bfc1..d9100b565198 100644
> --- a/drivers/gpu/drm/drm_vma_manager.c
> +++ b/drivers/gpu/drm/drm_vma_manager.c
> @@ -212,8 +212,7 @@ int drm_vma_offset_add(struct drm_vma_offset_manager *mgr,
> goto out_unlock;
> }
>
> - ret = drm_mm_insert_node(&mgr->vm_addr_space_mm, &node->vm_node,
> - pages, 0, DRM_MM_SEARCH_DEFAULT);
> + ret = drm_mm_insert_node(&mgr->vm_addr_space_mm, &node->vm_node, pages);
> if (ret)
> goto out_unlock;
>
> diff --git a/drivers/gpu/drm/etnaviv/etnaviv_mmu.c b/drivers/gpu/drm/etnaviv/etnaviv_mmu.c
> index f503af462dad..004456534e48 100644
> --- a/drivers/gpu/drm/etnaviv/etnaviv_mmu.c
> +++ b/drivers/gpu/drm/etnaviv/etnaviv_mmu.c
> @@ -107,6 +107,7 @@ static int etnaviv_iommu_find_iova(struct etnaviv_iommu *mmu,
> struct drm_mm_node *node, size_t size)
> {
> struct etnaviv_vram_mapping *free = NULL;
> + enum drm_mm_insert_mode mode = DRM_MM_INSERT_LOW;
> int ret;
>
> lockdep_assert_held(&mmu->lock);
> @@ -117,15 +118,10 @@ static int etnaviv_iommu_find_iova(struct etnaviv_iommu *mmu,
> struct list_head list;
> bool found;
>
> - /*
> - * XXX: The DRM_MM_SEARCH_BELOW is really a hack to trick
> - * drm_mm into giving out a low IOVA after address space
> - * rollover. This needs a proper fix.
> - */
> ret = drm_mm_insert_node_in_range(&mmu->mm, node,
> - size, 0, mmu->last_iova, ~0UL,
> - mmu->last_iova ? DRM_MM_SEARCH_DEFAULT : DRM_MM_SEARCH_BELOW);
> -
> + size, 0, 0,
> + mmu->last_iova, U64_MAX,
> + mode);
> if (ret != -ENOSPC)
> break;
>
> @@ -140,7 +136,7 @@ static int etnaviv_iommu_find_iova(struct etnaviv_iommu *mmu,
> }
>
> /* Try to retire some entries */
> - drm_mm_scan_init(&scan, &mmu->mm, size, 0, 0, 0);
> + drm_mm_scan_init(&scan, &mmu->mm, size, 0, 0, mode);
>
> found = 0;
> INIT_LIST_HEAD(&list);
> @@ -192,6 +188,8 @@ static int etnaviv_iommu_find_iova(struct etnaviv_iommu *mmu,
> list_del_init(&m->scan_node);
> }
>
> + mode = DRM_MM_INSERT_EVICT;
> +
> /*
> * We removed enough mappings so that the new allocation will
> * succeed. Ensure that the MMU will be flushed before the
> diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
> index 838f9f978786..6c7a83bbd068 100644
> --- a/drivers/gpu/drm/i915/i915_gem.c
> +++ b/drivers/gpu/drm/i915/i915_gem.c
> @@ -69,12 +69,10 @@ insert_mappable_node(struct i915_ggtt *ggtt,
> struct drm_mm_node *node, u32 size)
> {
> memset(node, 0, sizeof(*node));
> - return drm_mm_insert_node_in_range_generic(&ggtt->base.mm, node,
> - size, 0,
> - I915_COLOR_UNEVICTABLE,
> - 0, ggtt->mappable_end,
> - DRM_MM_SEARCH_DEFAULT,
> - DRM_MM_CREATE_DEFAULT);
> + return drm_mm_insert_node_in_range(&ggtt->base.mm, node,
> + size, 0, I915_COLOR_UNEVICTABLE,
> + 0, ggtt->mappable_end,
> + DRM_MM_INSERT_LOW);
> }
>
> static void
> diff --git a/drivers/gpu/drm/i915/i915_gem_evict.c b/drivers/gpu/drm/i915/i915_gem_evict.c
> index a43e44e18042..c181b1bb3d2c 100644
> --- a/drivers/gpu/drm/i915/i915_gem_evict.c
> +++ b/drivers/gpu/drm/i915/i915_gem_evict.c
> @@ -109,6 +109,7 @@ i915_gem_evict_something(struct i915_address_space *vm,
> }, **phase;
> struct i915_vma *vma, *next;
> struct drm_mm_node *node;
> + enum drm_mm_insert_mode mode;
> int ret;
>
> lockdep_assert_held(&vm->i915->drm.struct_mutex);
> @@ -127,10 +128,14 @@ i915_gem_evict_something(struct i915_address_space *vm,
> * On each list, the oldest objects lie at the HEAD with the freshest
> * object on the TAIL.
> */
> + mode = DRM_MM_INSERT_BEST;
> + if (flags & PIN_HIGH)
> + mode = DRM_MM_INSERT_HIGH;
> + if (flags & PIN_MAPPABLE)
> + mode = DRM_MM_INSERT_LOW;
> drm_mm_scan_init_with_range(&scan, &vm->mm,
> min_size, alignment, cache_level,
> - start, end,
> - flags & PIN_HIGH ? DRM_MM_CREATE_TOP : 0);
> + start, end, mode);
>
> /* Retire before we search the active list. Although we have
> * reasonable accuracy in our retirement lists, we may have
> diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
> index 91c2393199a3..a40ade6d1c16 100644
> --- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
> +++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
> @@ -437,12 +437,11 @@ static void *reloc_iomap(struct drm_i915_gem_object *obj,
> PIN_MAPPABLE | PIN_NONBLOCK);
> if (IS_ERR(vma)) {
> memset(&cache->node, 0, sizeof(cache->node));
> - ret = drm_mm_insert_node_in_range_generic
> + ret = drm_mm_insert_node_in_range
> (&ggtt->base.mm, &cache->node,
> PAGE_SIZE, 0, I915_COLOR_UNEVICTABLE,
> 0, ggtt->mappable_end,
> - DRM_MM_SEARCH_DEFAULT,
> - DRM_MM_CREATE_DEFAULT);
> + DRM_MM_INSERT_LOW);
> if (ret) /* no inactive aperture space, use cpu reloc */
> return NULL;
> } else {
> diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
> index 048040efc3f0..b7bcb1e62ce4 100644
> --- a/drivers/gpu/drm/i915/i915_gem_gtt.c
> +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
> @@ -2748,12 +2748,10 @@ int i915_gem_init_ggtt(struct drm_i915_private *dev_priv)
> return ret;
>
> /* Reserve a mappable slot for our lockless error capture */
> - ret = drm_mm_insert_node_in_range_generic(&ggtt->base.mm,
> - &ggtt->error_capture,
> - PAGE_SIZE, 0,
> - I915_COLOR_UNEVICTABLE,
> - 0, ggtt->mappable_end,
> - 0, 0);
> + ret = drm_mm_insert_node_in_range(&ggtt->base.mm, &ggtt->error_capture,
> + PAGE_SIZE, 0, I915_COLOR_UNEVICTABLE,
> + 0, ggtt->mappable_end,
> + DRM_MM_INSERT_LOW);
> if (ret)
> return ret;
>
> @@ -3663,7 +3661,7 @@ int i915_gem_gtt_insert(struct i915_address_space *vm,
> u64 size, u64 alignment, unsigned long color,
> u64 start, u64 end, unsigned int flags)
> {
> - u32 search_flag, alloc_flag;
> + enum drm_mm_insert_mode mode;
> u64 offset;
> int err;
>
> @@ -3684,13 +3682,11 @@ int i915_gem_gtt_insert(struct i915_address_space *vm,
> if (unlikely(round_up(start, alignment) > round_down(end - size, alignment)))
> return -ENOSPC;
>
> - if (flags & PIN_HIGH) {
> - search_flag = DRM_MM_SEARCH_BELOW;
> - alloc_flag = DRM_MM_CREATE_TOP;
> - } else {
> - search_flag = DRM_MM_SEARCH_DEFAULT;
> - alloc_flag = DRM_MM_CREATE_DEFAULT;
> - }
> + mode = DRM_MM_INSERT_BEST;
> + if (flags & PIN_HIGH)
> + mode = DRM_MM_INSERT_HIGH;
> + if (flags & PIN_MAPPABLE)
> + mode = DRM_MM_INSERT_LOW;
>
> /* We only allocate in PAGE_SIZE/GTT_PAGE_SIZE (4096) chunks,
> * so we know that we always have a minimum alignment of 4096.
> @@ -3702,10 +3698,9 @@ int i915_gem_gtt_insert(struct i915_address_space *vm,
> if (alignment <= I915_GTT_MIN_ALIGNMENT)
> alignment = 0;
>
> - err = drm_mm_insert_node_in_range_generic(&vm->mm, node,
> - size, alignment, color,
> - start, end,
> - search_flag, alloc_flag);
> + err = drm_mm_insert_node_in_range(&vm->mm, node,
> + size, alignment, color,
> + start, end, mode);
> if (err != -ENOSPC)
> return err;
>
> @@ -3743,9 +3738,7 @@ int i915_gem_gtt_insert(struct i915_address_space *vm,
> if (err)
> return err;
>
> - search_flag = DRM_MM_SEARCH_DEFAULT;
> - return drm_mm_insert_node_in_range_generic(&vm->mm, node,
> - size, alignment, color,
> - start, end,
> - search_flag, alloc_flag);
> + return drm_mm_insert_node_in_range(&vm->mm, node,
> + size, alignment, color,
> + start, end, DRM_MM_INSERT_EVICT);
> }
> diff --git a/drivers/gpu/drm/i915/i915_gem_stolen.c b/drivers/gpu/drm/i915/i915_gem_stolen.c
> index cba12ee90cbf..82ca8f49fec1 100644
> --- a/drivers/gpu/drm/i915/i915_gem_stolen.c
> +++ b/drivers/gpu/drm/i915/i915_gem_stolen.c
> @@ -55,9 +55,9 @@ int i915_gem_stolen_insert_node_in_range(struct drm_i915_private *dev_priv,
> return -ENODEV;
>
> mutex_lock(&dev_priv->mm.stolen_lock);
> - ret = drm_mm_insert_node_in_range(&dev_priv->mm.stolen, node, size,
> - alignment, start, end,
> - DRM_MM_SEARCH_DEFAULT);
> + ret = drm_mm_insert_node_in_range(&dev_priv->mm.stolen, node,
> + size, alignment, 0,
> + start, end, DRM_MM_INSERT_BEST);
> mutex_unlock(&dev_priv->mm.stolen_lock);
>
> return ret;
> diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c
> index 8098677a3916..c3b43f4d4f1f 100644
> --- a/drivers/gpu/drm/msm/msm_gem.c
> +++ b/drivers/gpu/drm/msm/msm_gem.c
> @@ -54,8 +54,7 @@ static struct page **get_pages_vram(struct drm_gem_object *obj,
> if (!p)
> return ERR_PTR(-ENOMEM);
>
> - ret = drm_mm_insert_node(&priv->vram.mm, msm_obj->vram_node,
> - npages, 0, DRM_MM_SEARCH_DEFAULT);
> + ret = drm_mm_insert_node(&priv->vram.mm, msm_obj->vram_node, npages);
> if (ret) {
> drm_free_large(p);
> return ERR_PTR(ret);
> diff --git a/drivers/gpu/drm/msm/msm_gem_vma.c b/drivers/gpu/drm/msm/msm_gem_vma.c
> index a311d26ccb21..b654eca7636a 100644
> --- a/drivers/gpu/drm/msm/msm_gem_vma.c
> +++ b/drivers/gpu/drm/msm/msm_gem_vma.c
> @@ -45,8 +45,7 @@ msm_gem_map_vma(struct msm_gem_address_space *aspace,
> if (WARN_ON(drm_mm_node_allocated(&vma->node)))
> return 0;
>
> - ret = drm_mm_insert_node(&aspace->mm, &vma->node, npages,
> - 0, DRM_MM_SEARCH_DEFAULT);
> + ret = drm_mm_insert_node(&aspace->mm, &vma->node, npages);
> if (ret)
> return ret;
>
> diff --git a/drivers/gpu/drm/selftests/test-drm_mm.c b/drivers/gpu/drm/selftests/test-drm_mm.c
> index 6df53e6c1308..bb5b7480e0b4 100644
> --- a/drivers/gpu/drm/selftests/test-drm_mm.c
> +++ b/drivers/gpu/drm/selftests/test-drm_mm.c
> @@ -22,23 +22,24 @@ static unsigned int max_iterations = 8192;
> static unsigned int max_prime = 128;
>
> enum {
> - DEFAULT,
> - TOPDOWN,
> BEST,
> + BOTTOMUP,
> + TOPDOWN,
> + EVICT,
> };
>
> static const struct insert_mode {
> const char *name;
> - unsigned int search_flags;
> - unsigned int create_flags;
> + enum drm_mm_insert_mode mode;
> } insert_modes[] = {
> - [DEFAULT] = { "default", DRM_MM_SEARCH_DEFAULT, DRM_MM_CREATE_DEFAULT },
> - [TOPDOWN] = { "top-down", DRM_MM_SEARCH_BELOW, DRM_MM_CREATE_TOP },
> - [BEST] = { "best", DRM_MM_SEARCH_BEST, DRM_MM_CREATE_DEFAULT },
> + [BEST] = { "best", DRM_MM_INSERT_BEST },
> + [BOTTOMUP] = { "bottom-up", DRM_MM_INSERT_LOW },
> + [TOPDOWN] = { "top-down", DRM_MM_INSERT_HIGH },
> + [EVICT] = { "evict", DRM_MM_INSERT_EVICT },
> {}
> }, evict_modes[] = {
> - { "default", DRM_MM_SEARCH_DEFAULT, DRM_MM_CREATE_DEFAULT },
> - { "top-down", DRM_MM_SEARCH_BELOW, DRM_MM_CREATE_TOP },
> + { "bottom-up", DRM_MM_INSERT_LOW },
> + { "top-down", DRM_MM_INSERT_HIGH },
> {}
> };
>
> @@ -526,8 +527,7 @@ static bool expect_insert(struct drm_mm *mm, struct drm_mm_node *node,
>
> err = drm_mm_insert_node_generic(mm, node,
> size, alignment, color,
> - mode->search_flags,
> - mode->create_flags);
> + mode->mode);
> if (err) {
> pr_err("insert (size=%llu, alignment=%llu, color=%lu, mode=%s) failed with err=%d\n",
> size, alignment, color, mode->name, err);
> @@ -547,7 +547,7 @@ static bool expect_insert_fail(struct drm_mm *mm, u64 size)
> struct drm_mm_node tmp = {};
> int err;
>
> - err = drm_mm_insert_node(mm, &tmp, size, 0, DRM_MM_SEARCH_DEFAULT);
> + err = drm_mm_insert_node(mm, &tmp, size);
> if (likely(err == -ENOSPC))
> return true;
>
> @@ -753,11 +753,10 @@ static bool expect_insert_in_range(struct drm_mm *mm, struct drm_mm_node *node,
> {
> int err;
>
> - err = drm_mm_insert_node_in_range_generic(mm, node,
> - size, alignment, color,
> - range_start, range_end,
> - mode->search_flags,
> - mode->create_flags);
> + err = drm_mm_insert_node_in_range(mm, node,
> + size, alignment, color,
> + range_start, range_end,
> + mode->mode);
> if (err) {
> pr_err("insert (size=%llu, alignment=%llu, color=%lu, mode=%s) nto range [%llx, %llx] failed with err=%d\n",
> size, alignment, color, mode->name,
> @@ -781,11 +780,10 @@ static bool expect_insert_in_range_fail(struct drm_mm *mm,
> struct drm_mm_node tmp = {};
> int err;
>
> - err = drm_mm_insert_node_in_range_generic(mm, &tmp,
> - size, 0, 0,
> - range_start, range_end,
> - DRM_MM_SEARCH_DEFAULT,
> - DRM_MM_CREATE_DEFAULT);
> + err = drm_mm_insert_node_in_range(mm, &tmp,
> + size, 0, 0,
> + range_start, range_end,
> + 0);
> if (likely(err == -ENOSPC))
> return true;
>
> @@ -1324,7 +1322,7 @@ static int evict_something(struct drm_mm *mm,
> drm_mm_scan_init_with_range(&scan, mm,
> size, alignment, 0,
> range_start, range_end,
> - mode->create_flags);
> + mode->mode);
> if (!evict_nodes(&scan,
> nodes, order, count, false,
> &evict_list))
> @@ -1332,8 +1330,7 @@ static int evict_something(struct drm_mm *mm,
>
> memset(&tmp, 0, sizeof(tmp));
> err = drm_mm_insert_node_generic(mm, &tmp, size, alignment, 0,
> - mode->search_flags,
> - mode->create_flags);
> + DRM_MM_INSERT_EVICT);
> if (err) {
> pr_err("Failed to insert into eviction hole: size=%d, align=%d\n",
> size, alignment);
> @@ -1408,8 +1405,7 @@ static int igt_evict(void *ignored)
> ret = -EINVAL;
> drm_mm_init(&mm, 0, size);
> for (n = 0; n < size; n++) {
> - err = drm_mm_insert_node(&mm, &nodes[n].node, 1, 0,
> - DRM_MM_SEARCH_DEFAULT);
> + err = drm_mm_insert_node(&mm, &nodes[n].node, 1);
> if (err) {
> pr_err("insert failed, step %d\n", n);
> ret = err;
> @@ -1517,8 +1513,7 @@ static int igt_evict_range(void *ignored)
> ret = -EINVAL;
> drm_mm_init(&mm, 0, size);
> for (n = 0; n < size; n++) {
> - err = drm_mm_insert_node(&mm, &nodes[n].node, 1, 0,
> - DRM_MM_SEARCH_DEFAULT);
> + err = drm_mm_insert_node(&mm, &nodes[n].node, 1);
> if (err) {
> pr_err("insert failed, step %d\n", n);
> ret = err;
> @@ -1904,7 +1899,7 @@ static int evict_color(struct drm_mm *mm,
> drm_mm_scan_init_with_range(&scan, mm,
> size, alignment, color,
> range_start, range_end,
> - mode->create_flags);
> + mode->mode);
> if (!evict_nodes(&scan,
> nodes, order, count, true,
> &evict_list))
> @@ -1912,8 +1907,7 @@ static int evict_color(struct drm_mm *mm,
>
> memset(&tmp, 0, sizeof(tmp));
> err = drm_mm_insert_node_generic(mm, &tmp, size, alignment, color,
> - mode->search_flags,
> - mode->create_flags);
> + DRM_MM_INSERT_EVICT);
> if (err) {
> pr_err("Failed to insert into eviction hole: size=%d, align=%d, color=%lu, err=%d\n",
> size, alignment, color, err);
> diff --git a/drivers/gpu/drm/sis/sis_mm.c b/drivers/gpu/drm/sis/sis_mm.c
> index 03defda77766..1622db24cd39 100644
> --- a/drivers/gpu/drm/sis/sis_mm.c
> +++ b/drivers/gpu/drm/sis/sis_mm.c
> @@ -109,8 +109,7 @@ static int sis_drm_alloc(struct drm_device *dev, struct drm_file *file,
> if (pool == AGP_TYPE) {
> retval = drm_mm_insert_node(&dev_priv->agp_mm,
> &item->mm_node,
> - mem->size, 0,
> - DRM_MM_SEARCH_DEFAULT);
> + mem->size);
> offset = item->mm_node.start;
> } else {
> #if defined(CONFIG_FB_SIS) || defined(CONFIG_FB_SIS_MODULE)
> @@ -122,8 +121,7 @@ static int sis_drm_alloc(struct drm_device *dev, struct drm_file *file,
> #else
> retval = drm_mm_insert_node(&dev_priv->vram_mm,
> &item->mm_node,
> - mem->size, 0,
> - DRM_MM_SEARCH_DEFAULT);
> + mem->size);
> offset = item->mm_node.start;
> #endif
> }
> diff --git a/drivers/gpu/drm/tegra/gem.c b/drivers/gpu/drm/tegra/gem.c
> index 7d853e6b5ff0..b523a5d4a38c 100644
> --- a/drivers/gpu/drm/tegra/gem.c
> +++ b/drivers/gpu/drm/tegra/gem.c
> @@ -128,8 +128,8 @@ static int tegra_bo_iommu_map(struct tegra_drm *tegra, struct tegra_bo *bo)
> if (!bo->mm)
> return -ENOMEM;
>
> - err = drm_mm_insert_node_generic(&tegra->mm, bo->mm, bo->gem.size,
> - PAGE_SIZE, 0, 0, 0);
> + err = drm_mm_insert_node_generic(&tegra->mm,
> + bo->mm, bo->gem.size, PAGE_SIZE, 0, 0);
> if (err < 0) {
> dev_err(tegra->drm->dev, "out of I/O virtual memory: %zd\n",
> err);
> diff --git a/drivers/gpu/drm/ttm/ttm_bo_manager.c b/drivers/gpu/drm/ttm/ttm_bo_manager.c
> index 988c48d1cf3e..90a6c0b03afc 100644
> --- a/drivers/gpu/drm/ttm/ttm_bo_manager.c
> +++ b/drivers/gpu/drm/ttm/ttm_bo_manager.c
> @@ -54,9 +54,8 @@ static int ttm_bo_man_get_node(struct ttm_mem_type_manager *man,
> {
> struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
> struct drm_mm *mm = &rman->mm;
> - struct drm_mm_node *node = NULL;
> - enum drm_mm_search_flags sflags = DRM_MM_SEARCH_BEST;
> - enum drm_mm_allocator_flags aflags = DRM_MM_CREATE_DEFAULT;
> + struct drm_mm_node *node;
> + enum drm_mm_insert_mode mode;
> unsigned long lpfn;
> int ret;
>
> @@ -68,16 +67,15 @@ static int ttm_bo_man_get_node(struct ttm_mem_type_manager *man,
> if (!node)
> return -ENOMEM;
>
> - if (place->flags & TTM_PL_FLAG_TOPDOWN) {
> - sflags = DRM_MM_SEARCH_BELOW;
> - aflags = DRM_MM_CREATE_TOP;
> - }
> + mode = DRM_MM_INSERT_BEST;
> + if (place->flags & TTM_PL_FLAG_TOPDOWN)
> + mode = DRM_MM_INSERT_HIGH;
>
> spin_lock(&rman->lock);
> - ret = drm_mm_insert_node_in_range_generic(mm, node, mem->num_pages,
> + ret = drm_mm_insert_node_in_range(mm, node,
> + mem->num_pages,
> mem->page_alignment, 0,
> - place->fpfn, lpfn,
> - sflags, aflags);
> + place->fpfn, lpfn, mode);
> spin_unlock(&rman->lock);
>
> if (unlikely(ret)) {
> diff --git a/drivers/gpu/drm/vc4/vc4_crtc.c b/drivers/gpu/drm/vc4/vc4_crtc.c
> index 93aece203c54..0c06844af445 100644
> --- a/drivers/gpu/drm/vc4/vc4_crtc.c
> +++ b/drivers/gpu/drm/vc4/vc4_crtc.c
> @@ -593,7 +593,7 @@ static int vc4_crtc_atomic_check(struct drm_crtc *crtc,
>
> spin_lock_irqsave(&vc4->hvs->mm_lock, flags);
> ret = drm_mm_insert_node(&vc4->hvs->dlist_mm, &vc4_state->mm,
> - dlist_count, 1, 0);
> + dlist_count);
> spin_unlock_irqrestore(&vc4->hvs->mm_lock, flags);
> if (ret)
> return ret;
> diff --git a/drivers/gpu/drm/vc4/vc4_hvs.c b/drivers/gpu/drm/vc4/vc4_hvs.c
> index fc68b1b4da52..f7f7677f6d8d 100644
> --- a/drivers/gpu/drm/vc4/vc4_hvs.c
> +++ b/drivers/gpu/drm/vc4/vc4_hvs.c
> @@ -141,8 +141,7 @@ static int vc4_hvs_upload_linear_kernel(struct vc4_hvs *hvs,
> int ret, i;
> u32 __iomem *dst_kernel;
>
> - ret = drm_mm_insert_node(&hvs->dlist_mm, space, VC4_KERNEL_DWORDS, 1,
> - 0);
> + ret = drm_mm_insert_node(&hvs->dlist_mm, space, VC4_KERNEL_DWORDS);
> if (ret) {
> DRM_ERROR("Failed to allocate space for filter kernel: %d\n",
> ret);
> diff --git a/drivers/gpu/drm/vc4/vc4_plane.c b/drivers/gpu/drm/vc4/vc4_plane.c
> index 110d1518f5d5..c1f06897136b 100644
> --- a/drivers/gpu/drm/vc4/vc4_plane.c
> +++ b/drivers/gpu/drm/vc4/vc4_plane.c
> @@ -514,9 +514,9 @@ static int vc4_plane_mode_set(struct drm_plane *plane,
> if (lbm_size) {
> if (!vc4_state->lbm.allocated) {
> spin_lock_irqsave(&vc4->hvs->mm_lock, irqflags);
> - ret = drm_mm_insert_node(&vc4->hvs->lbm_mm,
> - &vc4_state->lbm,
> - lbm_size, 32, 0);
> + ret = drm_mm_insert_node_generic(&vc4->hvs->lbm_mm,
> + &vc4_state->lbm,
> + lbm_size, 32, 0, 0);
> spin_unlock_irqrestore(&vc4->hvs->mm_lock, irqflags);
> } else {
> WARN_ON_ONCE(lbm_size != vc4_state->lbm.size);
> diff --git a/drivers/gpu/drm/via/via_mm.c b/drivers/gpu/drm/via/via_mm.c
> index a04ef1c992d9..4217d66a5cc6 100644
> --- a/drivers/gpu/drm/via/via_mm.c
> +++ b/drivers/gpu/drm/via/via_mm.c
> @@ -140,11 +140,11 @@ int via_mem_alloc(struct drm_device *dev, void *data,
> if (mem->type == VIA_MEM_AGP)
> retval = drm_mm_insert_node(&dev_priv->agp_mm,
> &item->mm_node,
> - tmpSize, 0, DRM_MM_SEARCH_DEFAULT);
> + tmpSize);
> else
> retval = drm_mm_insert_node(&dev_priv->vram_mm,
> &item->mm_node,
> - tmpSize, 0, DRM_MM_SEARCH_DEFAULT);
> + tmpSize);
> if (retval)
> goto fail_alloc;
>
> diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_cmdbuf.c b/drivers/gpu/drm/vmwgfx/vmwgfx_cmdbuf.c
> index aa04fb0159a7..77cb7c627e09 100644
> --- a/drivers/gpu/drm/vmwgfx/vmwgfx_cmdbuf.c
> +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_cmdbuf.c
> @@ -673,16 +673,10 @@ static bool vmw_cmdbuf_try_alloc(struct vmw_cmdbuf_man *man,
>
> memset(info->node, 0, sizeof(*info->node));
> spin_lock_bh(&man->lock);
> - ret = drm_mm_insert_node_generic(&man->mm, info->node, info->page_size,
> - 0, 0,
> - DRM_MM_SEARCH_DEFAULT,
> - DRM_MM_CREATE_DEFAULT);
> + ret = drm_mm_insert_node(&man->mm, info->node, info->page_size);
> if (ret) {
> vmw_cmdbuf_man_process(man);
> - ret = drm_mm_insert_node_generic(&man->mm, info->node,
> - info->page_size, 0, 0,
> - DRM_MM_SEARCH_DEFAULT,
> - DRM_MM_CREATE_DEFAULT);
> + ret = drm_mm_insert_node(&man->mm, info->node, info->page_size);
> }
>
> spin_unlock_bh(&man->lock);
> diff --git a/include/drm/drm_mm.h b/include/drm/drm_mm.h
> index 3bddca8fd2b5..d81b0ba9921f 100644
> --- a/include/drm/drm_mm.h
> +++ b/include/drm/drm_mm.h
> @@ -53,19 +53,62 @@
> #define DRM_MM_BUG_ON(expr) BUILD_BUG_ON_INVALID(expr)
> #endif
>
> -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_insert_mode - control search and allocation behaviour
> + *
> + * The &struct drm_mm range manager supports finding a suitable modes using
> + * a number of search trees. These trees are oranised by size, by address and
> + * in most recent eviction order. This allows the user to find either the
> + * smallest hole to reuse, the lowest or highest address to reuse, or simply
> + * reuse the most recent eviction that fits. When allocating the &drm_mm_node
> + * from within the hole, the &drm_mm_insert_mode also dictate whether to
> + * allocate the lowest matching address or the highest.
> + */
> +enum drm_mm_insert_mode {
> + /**
> + * @DRM_MM_INSERT_BEST:
> + *
> + * Search for the smallest hole (within the search range) that fits
> + * the desired node.
> + *
> + * Allocates the node from the bottom of the found hole.
> + */
> + DRM_MM_INSERT_BEST = 0,
>
> -enum drm_mm_allocator_flags {
> - DRM_MM_CREATE_DEFAULT = 0,
> - DRM_MM_CREATE_TOP = 1 << 0,
> -};
> + /**
> + * @DRM_MM_INSERT_LOW:
> + *
> + * Search for the lowest hole (address closest to 0, within the search
> + * range) that fits the desired node.
> + *
> + * Allocates the node from the bottom of the found hole.
> + */
> + DRM_MM_INSERT_LOW,
>
> -#define DRM_MM_BOTTOMUP DRM_MM_SEARCH_DEFAULT, DRM_MM_CREATE_DEFAULT
> -#define DRM_MM_TOPDOWN DRM_MM_SEARCH_BELOW, DRM_MM_CREATE_TOP
> + /**
> + * @DRM_MM_INSERT_HIGH:
> + *
> + * Search for the highest hole (address closest to U64_MAX, within the
> + * search range) that fits the desired node.
> + *
> + * Allocates the node from the *top* of the found hole. The specified
> + * alignment for the node is applied to the base of the node
> + * (&drm_mm_node.start).
> + */
> + DRM_MM_INSERT_HIGH,
> +
> + /**
> + * @DRM_MM_INSERT_EVICT:
> + *
> + * Search for the most recently evicted hole (within the search range)
> + * that fits the desired node. This is appropriate for use immediately
> + * after performing an eviction scan (see drm_mm_scan_init()) and
> + * removing the selected nodes to form a hole.
> + *
> + * Allocates the node from the bottom of the found hole.
> + */
> + DRM_MM_INSERT_EVICT,
> +};
>
> /**
> * struct drm_mm_node - allocated block in the DRM allocator
> @@ -84,14 +127,16 @@ struct drm_mm_node {
> /** @size: Size of the allocated block. */
> u64 size;
> /* private: */
> + struct drm_mm *mm;
> struct list_head node_list;
> struct list_head hole_stack;
> struct rb_node rb;
> - unsigned hole_follows : 1;
> - unsigned allocated : 1;
> - bool scanned_block : 1;
> + struct rb_node rb_hole_size;
> + struct rb_node rb_hole_addr;
> u64 __subtree_last;
> - struct drm_mm *mm;
> + u64 hole_size;
> + bool allocated : 1;
> + bool scanned_block : 1;
> #ifdef CONFIG_DRM_DEBUG_MM
> depot_stack_handle_t stack;
> #endif
> @@ -127,6 +172,8 @@ struct drm_mm {
> struct drm_mm_node head_node;
> /* Keep an interval_tree for fast lookup of drm_mm_nodes by address. */
> struct rb_root interval_tree;
> + struct rb_root holes_size;
> + struct rb_root holes_addr;
>
> unsigned long scan_active;
> };
> @@ -155,7 +202,7 @@ struct drm_mm_scan {
> u64 hit_end;
>
> unsigned long color;
> - unsigned int flags;
> + enum drm_mm_insert_mode mode;
> };
>
> /**
> @@ -208,7 +255,7 @@ static inline bool drm_mm_initialized(const struct drm_mm *mm)
> */
> static inline bool drm_mm_hole_follows(const struct drm_mm_node *node)
> {
> - return node->hole_follows;
> + return node->hole_size;
> }
>
> static inline u64 __drm_mm_hole_node_start(const struct drm_mm_node *hole_node)
> @@ -291,17 +338,9 @@ static inline u64 drm_mm_hole_node_end(const struct drm_mm_node *hole_node)
> #define drm_mm_for_each_node_safe(entry, next, mm) \
> list_for_each_entry_safe(entry, next, drm_mm_nodes(mm), node_list)
>
> -#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))
> -
> /**
> * drm_mm_for_each_hole - iterator to walk over all holes
> - * @entry: &drm_mm_node used internally to track progress
> + * @pos: &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
> @@ -314,57 +353,28 @@ static inline u64 drm_mm_hole_node_end(const struct drm_mm_node *hole_node)
> * 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) \
> - __drm_mm_for_each_hole(entry, mm, hole_start, hole_end, 0)
> +#define drm_mm_for_each_hole(pos, mm, hole_start, hole_end) \
> + for (pos = list_first_entry(&(mm)->hole_stack, \
> + typeof(*pos), hole_stack); \
> + &pos->hole_stack != &(mm)->hole_stack ? \
> + hole_start = drm_mm_hole_node_start(pos), \
> + hole_end = hole_start + pos->hole_size, \
> + 1 : 0; \
> + pos = list_next_entry(pos, 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_in_range_generic(struct drm_mm *mm,
> - struct drm_mm_node *node,
> - u64 size,
> - u64 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,
> - u64 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);
> -}
> +int drm_mm_insert_node_in_range(struct drm_mm *mm,
> + struct drm_mm_node *node,
> + u64 size,
> + u64 alignment,
> + unsigned long color,
> + u64 start,
> + u64 end,
> + enum drm_mm_insert_mode mode);
>
> /**
> * drm_mm_insert_node_generic - search for space and insert @node
> @@ -373,8 +383,7 @@ static inline int drm_mm_insert_node_in_range(struct drm_mm *mm,
> * @size: size of the allocation
> * @alignment: alignment of the allocation
> * @color: opaque tag value to use for this node
> - * @sflags: flags to fine-tune the allocation search
> - * @aflags: flags to fine-tune the allocation behavior
> + * @mode: fine-tune the allocation search and placement
> *
> * This is a simplified version of drm_mm_insert_node_in_range_generic() with no
> * range restrictions applied.
> @@ -388,13 +397,11 @@ static inline int
> drm_mm_insert_node_generic(struct drm_mm *mm, struct drm_mm_node *node,
> u64 size, u64 alignment,
> unsigned long color,
> - enum drm_mm_search_flags sflags,
> - enum drm_mm_allocator_flags aflags)
> + enum drm_mm_insert_mode mode)
> {
> - return drm_mm_insert_node_in_range_generic(mm, node,
> - size, alignment, 0,
> - 0, U64_MAX,
> - sflags, aflags);
> + return drm_mm_insert_node_in_range(mm, node,
> + size, alignment, color,
> + 0, U64_MAX, mode);
> }
>
> /**
> @@ -402,8 +409,6 @@ drm_mm_insert_node_generic(struct drm_mm *mm, struct drm_mm_node *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.
> @@ -415,13 +420,9 @@ drm_mm_insert_node_generic(struct drm_mm *mm, struct drm_mm_node *node,
> */
> static inline int drm_mm_insert_node(struct drm_mm *mm,
> struct drm_mm_node *node,
> - u64 size,
> - u64 alignment,
> - enum drm_mm_search_flags flags)
> + u64 size)
> {
> - return drm_mm_insert_node_generic(mm, node,
> - size, alignment, 0,
> - flags, DRM_MM_CREATE_DEFAULT);
> + return drm_mm_insert_node_generic(mm, node, size, 0, 0, 0);
> }
>
> void drm_mm_remove_node(struct drm_mm_node *node);
> @@ -468,7 +469,7 @@ void drm_mm_scan_init_with_range(struct drm_mm_scan *scan,
> struct drm_mm *mm,
> u64 size, u64 alignment, unsigned long color,
> u64 start, u64 end,
> - unsigned int flags);
> + enum drm_mm_insert_mode mode);
>
> /**
> * drm_mm_scan_init - initialize lru scanning
> @@ -477,7 +478,7 @@ void drm_mm_scan_init_with_range(struct drm_mm_scan *scan,
> * @size: size of the allocation
> * @alignment: alignment of the allocation
> * @color: opaque tag value to use for the allocation
> - * @flags: flags to specify how the allocation will be performed afterwards
> + * @mode: fine-tune the allocation search and placement
> *
> * This is a simplified version of drm_mm_scan_init_with_range() with no range
> * restrictions applied.
> @@ -494,12 +495,11 @@ static inline void drm_mm_scan_init(struct drm_mm_scan *scan,
> u64 size,
> u64 alignment,
> unsigned long color,
> - unsigned int flags)
> + enum drm_mm_insert_mode mode)
> {
> drm_mm_scan_init_with_range(scan, mm,
> size, alignment, color,
> - 0, U64_MAX,
> - flags);
> + 0, U64_MAX, mode);
> }
>
> bool drm_mm_scan_add_block(struct drm_mm_scan *scan,
> --
> 2.11.0
>
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