[PATCH v4 26/38] drm: Extract struct drm_mm_scan from struct drm_mm

Chris Wilson
2016-12-22T08:36:29Z

The scan state occupies a large proportion of the struct drm_mm and is
rarely used and only contains temporary state. That makes it suitable to
moving to its struct and onto the stack of the callers.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
---
drivers/gpu/drm/drm_mm.c | 124 ++++++++++++++++++--------------
drivers/gpu/drm/etnaviv/etnaviv_mmu.c | 7 +-
drivers/gpu/drm/i915/i915_gem_evict.c | 19 +++--
drivers/gpu/drm/selftests/test-drm_mm.c | 45 ++++++------
include/drm/drm_mm.h | 43 +++++++----
5 files changed, 138 insertions(+), 100 deletions(-)

diff --git a/drivers/gpu/drm/drm_mm.c b/drivers/gpu/drm/drm_mm.c
index b80305484124..21bd2e13738b 100644
--- a/drivers/gpu/drm/drm_mm.c
+++ b/drivers/gpu/drm/drm_mm.c
@@ -574,7 +574,7 @@ static struct drm_mm_node *drm_mm_search_free_generic(const struct drm_mm *mm,
u64 adj_end;
u64 best_size;

- DRM_MM_BUG_ON(mm->scanned_blocks);
+ DRM_MM_BUG_ON(mm->scan_active);

best = NULL;
best_size = ~0UL;
@@ -618,7 +618,7 @@ static struct drm_mm_node *drm_mm_search_free_in_range_generic(const struct drm_
u64 adj_end;
u64 best_size;

- DRM_MM_BUG_ON(mm->scanned_blocks);
+ DRM_MM_BUG_ON(mm->scan_active);

best = NULL;
best_size = ~0UL;
@@ -693,7 +693,7 @@ EXPORT_SYMBOL(drm_mm_replace_node);
*
* The DRM range allocator supports this use-case through the scanning
* interfaces. First a scan operation needs to be initialized with
- * drm_mm_init_scan() or drm_mm_init_scan_with_range(). The driver adds
+ * drm_mm_scan_init() or drm_mm_scan_init_with_range(). The driver adds
* objects to the roaster (probably by walking an LRU list, but this can be
* freely implemented) until a suitable hole is found or there's no further
* evictable object.
@@ -710,7 +710,8 @@ EXPORT_SYMBOL(drm_mm_replace_node);
*/

/**
- * drm_mm_init_scan - initialize lru scanning
+ * drm_mm_scan_init - initialize lru scanning
+ * @scan: scan state
* @mm: drm_mm to scan
* @size: size of the allocation
* @alignment: alignment of the allocation
@@ -724,26 +725,33 @@ EXPORT_SYMBOL(drm_mm_replace_node);
* As long as the scan list is non-empty, no other operations than
* adding/removing nodes to/from the scan list are allowed.
*/
-void drm_mm_init_scan(struct drm_mm *mm,
+void drm_mm_scan_init(struct drm_mm_scan *scan,
+ struct drm_mm *mm,
u64 size,
u64 alignment,
unsigned long color)
{
DRM_MM_BUG_ON(!size);
+ DRM_MM_BUG_ON(mm->scan_active);

- mm->scan_color = color;
- mm->scan_alignment = alignment;
- mm->scan_size = size;
- mm->scanned_blocks = 0;
- mm->scan_hit_start = 0;
- mm->scan_hit_end = 0;
- mm->scan_check_range = 0;
- mm->prev_scanned_node = NULL;
+ scan->mm = mm;
+
+ scan->color = color;
+ scan->alignment = alignment;
+ scan->size = size;
+
+ scan->check_range = 0;
+
+ scan->hit_start = U64_MAX;
+ scan->hit_end = 0;
+
+ scan->prev_scanned_node = NULL;
}
-EXPORT_SYMBOL(drm_mm_init_scan);
+EXPORT_SYMBOL(drm_mm_scan_init);

/**
- * drm_mm_init_scan - initialize range-restricted lru scanning
+ * drm_mm_scan_init_with_range - initialize range-restricted lru scanning
+ * @scan: scan state
* @mm: drm_mm to scan
* @size: size of the allocation
* @alignment: alignment of the allocation
@@ -759,7 +767,8 @@ EXPORT_SYMBOL(drm_mm_init_scan);
* As long as the scan list is non-empty, no other operations than
* adding/removing nodes to/from the scan list are allowed.
*/
-void drm_mm_init_scan_with_range(struct drm_mm *mm,
+void drm_mm_scan_init_with_range(struct drm_mm_scan *scan,
+ struct drm_mm *mm,
u64 size,
u64 alignment,
unsigned long color,
@@ -768,19 +777,25 @@ void drm_mm_init_scan_with_range(struct drm_mm *mm,
{
DRM_MM_BUG_ON(start >= end);
DRM_MM_BUG_ON(!size || size > end - start);
+ DRM_MM_BUG_ON(mm->scan_active);
+
+ scan->mm = mm;
+
+ scan->color = color;
+ scan->alignment = alignment;
+ scan->size = size;
+
+ DRM_MM_BUG_ON(end <= start);
+ scan->range_start = start;
+ scan->range_end = end;
+ scan->check_range = 1;

- mm->scan_color = color;
- mm->scan_alignment = alignment;
- mm->scan_size = size;
- mm->scanned_blocks = 0;
- mm->scan_hit_start = 0;
- mm->scan_hit_end = 0;
- mm->scan_start = start;
- mm->scan_end = end;
- mm->scan_check_range = 1;
- mm->prev_scanned_node = NULL;
+ scan->hit_start = U64_MAX;
+ scan->hit_end = 0;
+
+ scan->prev_scanned_node = NULL;
}
-EXPORT_SYMBOL(drm_mm_init_scan_with_range);
+EXPORT_SYMBOL(drm_mm_scan_init_with_range);

/**
* drm_mm_scan_add_block - add a node to the scan list
@@ -792,46 +807,46 @@ EXPORT_SYMBOL(drm_mm_init_scan_with_range);
* Returns:
* True if a hole has been found, false otherwise.
*/
-bool drm_mm_scan_add_block(struct drm_mm_node *node)
+bool drm_mm_scan_add_block(struct drm_mm_scan *scan,
+ struct drm_mm_node *node)
{
- struct drm_mm *mm = node->mm;
+ struct drm_mm *mm = scan->mm;
struct drm_mm_node *prev_node;
u64 hole_start, hole_end;
u64 adj_start, adj_end;

- mm->scanned_blocks++;
-
+ DRM_MM_BUG_ON(node->mm != mm);
+ DRM_MM_BUG_ON(!node->allocated);
DRM_MM_BUG_ON(node->scanned_block);
node->scanned_block = 1;
+ mm->scan_active++;

- prev_node = list_entry(node->node_list.prev, struct drm_mm_node,
- node_list);
+ prev_node = list_prev_entry(node, node_list);

node->scanned_preceeds_hole = prev_node->hole_follows;
prev_node->hole_follows = 1;
list_del(&node->node_list);
node->node_list.prev = &prev_node->node_list;
- node->node_list.next = &mm->prev_scanned_node->node_list;
- mm->prev_scanned_node = node;
+ node->node_list.next = &scan->prev_scanned_node->node_list;
+ scan->prev_scanned_node = node;

adj_start = hole_start = drm_mm_hole_node_start(prev_node);
adj_end = hole_end = drm_mm_hole_node_end(prev_node);

- if (mm->scan_check_range) {
- if (adj_start < mm->scan_start)
- adj_start = mm->scan_start;
- if (adj_end > mm->scan_end)
- adj_end = mm->scan_end;
+ if (scan->check_range) {
+ if (adj_start < scan->range_start)
+ adj_start = scan->range_start;
+ if (adj_end > scan->range_end)
+ adj_end = scan->range_end;
}

if (mm->color_adjust)
- mm->color_adjust(prev_node, mm->scan_color,
- &adj_start, &adj_end);
+ mm->color_adjust(prev_node, scan->color, &adj_start, &adj_end);

if (check_free_hole(adj_start, adj_end,
- mm->scan_size, mm->scan_alignment)) {
- mm->scan_hit_start = hole_start;
- mm->scan_hit_end = hole_end;
+ scan->size, scan->alignment)) {
+ scan->hit_start = hole_start;
+ scan->hit_end = hole_end;
return true;
}

@@ -856,24 +871,25 @@ EXPORT_SYMBOL(drm_mm_scan_add_block);
* True if this block should be evicted, false otherwise. Will always
* return false when no hole has been found.
*/
-bool drm_mm_scan_remove_block(struct drm_mm_node *node)
+bool drm_mm_scan_remove_block(struct drm_mm_scan *scan,
+ struct drm_mm_node *node)
{
- struct drm_mm *mm = node->mm;
struct drm_mm_node *prev_node;

- mm->scanned_blocks--;
-
+ DRM_MM_BUG_ON(node->mm != scan->mm);
DRM_MM_BUG_ON(!node->scanned_block);
node->scanned_block = 0;

- prev_node = list_entry(node->node_list.prev, struct drm_mm_node,
- node_list);
+ DRM_MM_BUG_ON(!node->mm->scan_active);
+ node->mm->scan_active--;
+
+ prev_node = list_prev_entry(node, node_list);

prev_node->hole_follows = node->scanned_preceeds_hole;
list_add(&node->node_list, &prev_node->node_list);

- return (drm_mm_hole_node_end(node) > mm->scan_hit_start &&
- node->start < mm->scan_hit_end);
+ return (drm_mm_hole_node_end(node) > scan->hit_start &&
+ node->start < scan->hit_end);
}
EXPORT_SYMBOL(drm_mm_scan_remove_block);

@@ -890,7 +906,7 @@ void drm_mm_init(struct drm_mm *mm, u64 start, u64 size)
DRM_MM_BUG_ON(start + size <= start);

INIT_LIST_HEAD(&mm->hole_stack);
- mm->scanned_blocks = 0;
+ mm->scan_active = 0;

/* Clever trick to avoid a special case in the free hole tracking. */
INIT_LIST_HEAD(&mm->head_node.node_list);
diff --git a/drivers/gpu/drm/etnaviv/etnaviv_mmu.c b/drivers/gpu/drm/etnaviv/etnaviv_mmu.c
index 169ac96e8f08..fe1e886dcabb 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_mmu.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_mmu.c
@@ -113,6 +113,7 @@ static int etnaviv_iommu_find_iova(struct etnaviv_iommu *mmu,

while (1) {
struct etnaviv_vram_mapping *m, *n;
+ struct drm_mm_scan scan;
struct list_head list;
bool found;

@@ -134,7 +135,7 @@ static int etnaviv_iommu_find_iova(struct etnaviv_iommu *mmu,
}

/* Try to retire some entries */
- drm_mm_init_scan(&mmu->mm, size, 0, 0);
+ drm_mm_scan_init(&scan, &mmu->mm, size, 0, 0);

found = 0;
INIT_LIST_HEAD(&list);
@@ -151,7 +152,7 @@ static int etnaviv_iommu_find_iova(struct etnaviv_iommu *mmu,
continue;

list_add(&free->scan_node, &list);
- if (drm_mm_scan_add_block(&free->vram_node)) {
+ if (drm_mm_scan_add_block(&scan, &free->vram_node)) {
found = true;
break;
}
@@ -171,7 +172,7 @@ static int etnaviv_iommu_find_iova(struct etnaviv_iommu *mmu,
* can leave the block pinned.
*/
list_for_each_entry_safe(m, n, &list, scan_node)
- if (!drm_mm_scan_remove_block(&m->vram_node))
+ if (!drm_mm_scan_remove_block(&scan, &m->vram_node))
list_del_init(&m->scan_node);

/*
diff --git a/drivers/gpu/drm/i915/i915_gem_evict.c b/drivers/gpu/drm/i915/i915_gem_evict.c
index 6457fd0c33a8..6db0d73c0aa7 100644
--- a/drivers/gpu/drm/i915/i915_gem_evict.c
+++ b/drivers/gpu/drm/i915/i915_gem_evict.c
@@ -51,7 +51,10 @@ static bool ggtt_is_idle(struct drm_i915_private *dev_priv)
}

static bool
-mark_free(struct i915_vma *vma, unsigned int flags, struct list_head *unwind)
+mark_free(struct drm_mm_scan *scan,
+ struct i915_vma *vma,
+ unsigned int flags,
+ struct list_head *unwind)
{
if (i915_vma_is_pinned(vma))
return false;
@@ -63,7 +66,7 @@ mark_free(struct i915_vma *vma, unsigned int flags, struct list_head *unwind)
return false;

list_add(&vma->exec_list, unwind);
- return drm_mm_scan_add_block(&vma->node);
+ return drm_mm_scan_add_block(scan, &vma->node);
}

/**
@@ -97,6 +100,7 @@ i915_gem_evict_something(struct i915_address_space *vm,
unsigned flags)
{
struct drm_i915_private *dev_priv = vm->i915;
+ struct drm_mm_scan scan;
struct list_head eviction_list;
struct list_head *phases[] = {
&vm->inactive_list,
@@ -123,11 +127,12 @@ i915_gem_evict_something(struct i915_address_space *vm,
* object on the TAIL.
*/
if (start != 0 || end != vm->total) {
- drm_mm_init_scan_with_range(&vm->mm, min_size,
+ drm_mm_scan_init_with_range(&scan, &vm->mm, min_size,
alignment, cache_level,
start, end);
} else
- drm_mm_init_scan(&vm->mm, min_size, alignment, cache_level);
+ drm_mm_scan_init(&scan, &vm->mm, min_size,
+ alignment, cache_level);

/* Retire before we search the active list. Although we have
* reasonable accuracy in our retirement lists, we may have
@@ -144,13 +149,13 @@ i915_gem_evict_something(struct i915_address_space *vm,
phase = phases;
do {
list_for_each_entry(vma, *phase, vm_link)
- if (mark_free(vma, flags, &eviction_list))
+ if (mark_free(&scan, vma, flags, &eviction_list))
goto found;
} while (*++phase);

/* Nothing found, clean up and bail out! */
list_for_each_entry_safe(vma, next, &eviction_list, exec_list) {
- ret = drm_mm_scan_remove_block(&vma->node);
+ ret = drm_mm_scan_remove_block(&scan, &vma->node);
BUG_ON(ret);

INIT_LIST_HEAD(&vma->exec_list);
@@ -199,7 +204,7 @@ i915_gem_evict_something(struct i915_address_space *vm,
* of any of our objects, thus corrupting the list).
*/
list_for_each_entry_safe(vma, next, &eviction_list, exec_list) {
- if (drm_mm_scan_remove_block(&vma->node))
+ if (drm_mm_scan_remove_block(&scan, &vma->node))
__i915_vma_pin(vma);
else
list_del_init(&vma->exec_list);
diff --git a/drivers/gpu/drm/selftests/test-drm_mm.c b/drivers/gpu/drm/selftests/test-drm_mm.c
index e2ed9efb361c..997f2bc93b9b 100644
--- a/drivers/gpu/drm/selftests/test-drm_mm.c
+++ b/drivers/gpu/drm/selftests/test-drm_mm.c
@@ -1114,11 +1114,11 @@ static int igt_align64(void *ignored)
return igt_align_pot(64);
}

-static void show_scan(const struct drm_mm *scan)
+static void show_scan(const struct drm_mm_scan *scan)
{
pr_info("scan: hit [%llx, %llx], size=%lld, align=%lld, color=%ld\n",
- scan->scan_hit_start, scan->scan_hit_end,
- scan->scan_size, scan->scan_alignment, scan->scan_color);
+ scan->hit_start, scan->hit_end,
+ scan->size, scan->alignment, scan->color);
}

static void show_holes(const struct drm_mm *mm, int count)
@@ -1158,7 +1158,7 @@ struct evict_node {
struct list_head link;
};

-static bool evict_nodes(struct drm_mm *mm,
+static bool evict_nodes(struct drm_mm_scan *scan,
struct evict_node *nodes,
unsigned int *order,
unsigned int count,
@@ -1170,18 +1170,16 @@ static bool evict_nodes(struct drm_mm *mm,
for (i = 0; i < count; i++) {
e = &nodes[order ? order[i] : i];
list_add(&e->link, evict_list);
- if (drm_mm_scan_add_block(&e->node))
+ if (drm_mm_scan_add_block(scan, &e->node))
break;
}
list_for_each_entry_safe(e, en, evict_list, link) {
- if (!drm_mm_scan_remove_block(&e->node))
+ if (!drm_mm_scan_remove_block(scan, &e->node))
list_del(&e->link);
}
if (list_empty(evict_list)) {
pr_err("Failed to find eviction: size=%lld [avail=%d], align=%lld (color=%lu)\n",
- mm->scan_size, count,
- mm->scan_alignment,
- mm->scan_color);
+ scan->size, count, scan->alignment, scan->color);
return false;
}

@@ -1195,19 +1193,20 @@ static bool evict_nothing(struct drm_mm *mm,
unsigned int total_size,
struct evict_node *nodes)
{
+ struct drm_mm_scan scan;
LIST_HEAD(evict_list);
struct evict_node *e;
struct drm_mm_node *node;
unsigned int n;

- drm_mm_init_scan(mm, 1, 0, 0);
+ drm_mm_scan_init(&scan, mm, 1, 0, 0);
for (n = 0; n < total_size; n++) {
e = &nodes[n];
list_add(&e->link, &evict_list);
- drm_mm_scan_add_block(&e->node);
+ drm_mm_scan_add_block(&scan, &e->node);
}
list_for_each_entry(e, &evict_list, link)
- drm_mm_scan_remove_block(&e->node);
+ drm_mm_scan_remove_block(&scan, &e->node);

for (n = 0; n < total_size; n++) {
e = &nodes[n];
@@ -1241,19 +1240,21 @@ static bool evict_everything(struct drm_mm *mm,
unsigned int total_size,
struct evict_node *nodes)
{
+ struct drm_mm_scan scan;
LIST_HEAD(evict_list);
struct evict_node *e;
unsigned int n;
int err;

- drm_mm_init_scan(mm, total_size, 0, 0);
+ drm_mm_scan_init(&scan, mm, total_size, 0, 0);
for (n = 0; n < total_size; n++) {
e = &nodes[n];
list_add(&e->link, &evict_list);
- drm_mm_scan_add_block(&e->node);
+ if (drm_mm_scan_add_block(&scan, &e->node))
+ break;
}
list_for_each_entry(e, &evict_list, link) {
- if (!drm_mm_scan_remove_block(&e->node)) {
+ if (!drm_mm_scan_remove_block(&scan, &e->node)) {
pr_err("Node %lld not marked for eviction!\n",
e->node.start);
list_del(&e->link);
@@ -1287,15 +1288,16 @@ static int evict_something(struct drm_mm *mm,
unsigned int alignment,
const struct insert_mode *mode)
{
+ struct drm_mm_scan scan;
LIST_HEAD(evict_list);
struct evict_node *e;
struct drm_mm_node tmp;
int err;

- drm_mm_init_scan_with_range(mm,
+ drm_mm_scan_init_with_range(&scan, mm,
size, alignment, 0,
range_start, range_end);
- if (!evict_nodes(mm,
+ if (!evict_nodes(&scan,
nodes, order, count,
&evict_list))
return -EINVAL;
@@ -1307,7 +1309,7 @@ static int evict_something(struct drm_mm *mm,
if (err) {
pr_err("Failed to insert into eviction hole: size=%d, align=%d\n",
size, alignment);
- show_scan(mm);
+ show_scan(&scan);
show_holes(mm, 3);
return err;
}
@@ -1864,15 +1866,16 @@ static int evict_color(struct drm_mm *mm,
unsigned long color,
const struct insert_mode *mode)
{
+ struct drm_mm_scan scan;
LIST_HEAD(evict_list);
struct evict_node *e;
struct drm_mm_node tmp;
int err;

- drm_mm_init_scan_with_range(mm,
+ drm_mm_scan_init_with_range(&scan, mm,
size, alignment, color,
range_start, range_end);
- if (!evict_nodes(mm,
+ if (!evict_nodes(&scan,
nodes, order, count,
&evict_list))
return -EINVAL;
@@ -1884,7 +1887,7 @@ static int evict_color(struct drm_mm *mm,
if (err) {
pr_err("Failed to insert into eviction hole: size=%d, align=%d, color=%lu, err=%d\n",
size, alignment, color, err);
- show_scan(mm);
+ show_scan(&scan);
show_holes(mm, 3);
return err;
}
diff --git a/include/drm/drm_mm.h b/include/drm/drm_mm.h
index 72e0c0ddf8d0..fcad718c5fb4 100644
--- a/include/drm/drm_mm.h
+++ b/include/drm/drm_mm.h
@@ -98,20 +98,29 @@ struct drm_mm {
/* Keep an interval_tree for fast lookup of drm_mm_nodes by address. */
struct rb_root interval_tree;

- unsigned int scan_check_range : 1;
- unsigned int scanned_blocks;
- unsigned long scan_color;
- u64 scan_alignment;
- u64 scan_size;
- u64 scan_hit_start;
- u64 scan_hit_end;
- u64 scan_start;
- u64 scan_end;
- struct drm_mm_node *prev_scanned_node;
-
void (*color_adjust)(const struct drm_mm_node *node,
unsigned long color,
u64 *start, u64 *end);
+
+ unsigned long scan_active;
+};
+
+struct drm_mm_scan {
+ struct drm_mm *mm;
+
+ u64 size;
+ u64 alignment;
+
+ u64 range_start;
+ u64 range_end;
+
+ u64 hit_start;
+ u64 hit_end;
+
+ struct drm_mm_node *prev_scanned_node;
+
+ unsigned long color;
+ bool check_range : 1;
};

/**
@@ -378,18 +387,22 @@ __drm_mm_interval_first(const struct drm_mm *mm, u64 start, u64 last);
node__ && node__->start < (end__); \
node__ = list_next_entry(node__, node_list))

-void drm_mm_init_scan(struct drm_mm *mm,
+void drm_mm_scan_init(struct drm_mm_scan *scan,
+ struct drm_mm *mm,
u64 size,
u64 alignment,
unsigned long color);
-void drm_mm_init_scan_with_range(struct drm_mm *mm,
+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);
-bool drm_mm_scan_add_block(struct drm_mm_node *node);
-bool drm_mm_scan_remove_block(struct drm_mm_node *node);
+bool drm_mm_scan_add_block(struct drm_mm_scan *scan,
+ struct drm_mm_node *node);
+bool drm_mm_scan_remove_block(struct drm_mm_scan *scan,
+ struct drm_mm_node *node);

void drm_mm_debug_table(const struct drm_mm *mm, const char *prefix);
#ifdef CONFIG_DEBUG_FS
--
2.11.0

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