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drm/i915: cleanup cache-coloring

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Try to tidy up the cache-coloring such that we rid the code of any
mm.color_adjust assumptions, this should hopefully make it more obvious
in the code when we need to actually use the cache-level as the color,
and as a bonus should make adding a different color-scheme simpler.

Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20190909124052.22900-3-matthew.auld@intel.com
This commit is contained in:
Matthew Auld 2019-09-09 13:40:52 +01:00 committed by Chris Wilson
parent e9ceb751ad
commit 33dd889923
7 changed files with 34 additions and 26 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/gpu/drm/i915/gem/i915_gem_domain.c
View File

@ -294,8 +294,10 @@ int i915_gem_object_set_cache_level(struct drm_i915_gem_object *obj,
}
}
list_for_each_entry(vma, &obj->vma.list, obj_link)
list_for_each_entry(vma, &obj->vma.list, obj_link) {
if (i915_vm_has_cache_coloring(vma->vm))
vma->node.color = cache_level;
}
i915_gem_object_set_cache_coherency(obj, cache_level);
obj->cache_dirty = true; /* Always invalidate stale cachelines */

2
drivers/gpu/drm/i915/i915_drv.h
View File

@ -2364,7 +2364,7 @@ i915_gem_context_lookup(struct drm_i915_file_private *file_priv, u32 id)
/* i915_gem_evict.c */
int __must_check i915_gem_evict_something(struct i915_address_space *vm,
u64 min_size, u64 alignment,
unsigned cache_level,
unsigned long color,
u64 start, u64 end,
unsigned flags);
int __must_check i915_gem_evict_for_node(struct i915_address_space *vm,

12
drivers/gpu/drm/i915/i915_gem_evict.c
View File

@ -70,7 +70,7 @@ mark_free(struct drm_mm_scan *scan,
* @vm: address space to evict from
* @min_size: size of the desired free space
* @alignment: alignment constraint of the desired free space
* @cache_level: cache_level for the desired space
* @color: color for the desired space
* @start: start (inclusive) of the range from which to evict objects
* @end: end (exclusive) of the range from which to evict objects
* @flags: additional flags to control the eviction algorithm
@ -91,7 +91,7 @@ mark_free(struct drm_mm_scan *scan,
int
i915_gem_evict_something(struct i915_address_space *vm,
u64 min_size, u64 alignment,
unsigned cache_level,
unsigned long color,
u64 start, u64 end,
unsigned flags)
{
@ -124,7 +124,7 @@ i915_gem_evict_something(struct i915_address_space *vm,
if (flags & PIN_MAPPABLE)
mode = DRM_MM_INSERT_LOW;
drm_mm_scan_init_with_range(&scan, &vm->mm,
min_size, alignment, cache_level,
min_size, alignment, color,
start, end, mode);
/*
@ -266,7 +266,6 @@ int i915_gem_evict_for_node(struct i915_address_space *vm,
u64 start = target->start;
u64 end = start + target->size;
struct i915_vma *vma, *next;
bool check_color;
int ret = 0;
lockdep_assert_held(&vm->i915->drm.struct_mutex);
@ -283,8 +282,7 @@ int i915_gem_evict_for_node(struct i915_address_space *vm,
if (!(flags & PIN_NONBLOCK))
i915_retire_requests(vm->i915);
check_color = vm->mm.color_adjust;
if (check_color) {
if (i915_vm_has_cache_coloring(vm)) {
/* Expand search to cover neighbouring guard pages (or lack!) */
if (start)
start -= I915_GTT_PAGE_SIZE;
@ -310,7 +308,7 @@ int i915_gem_evict_for_node(struct i915_address_space *vm,
* abutt and conflict. If they are in conflict, then we evict
* those as well to make room for our guard pages.
*/
if (check_color) {
if (i915_vm_has_cache_coloring(vm)) {
if (node->start + node->size == target->start) {
if (node->color == target->color)
continue;

6
drivers/gpu/drm/i915/i915_gem_gtt.h
View File

@ -376,6 +376,12 @@ i915_vm_has_scratch_64K(struct i915_address_space *vm)
return vm->scratch_order == get_order(I915_GTT_PAGE_SIZE_64K);
}
static inline bool
i915_vm_has_cache_coloring(struct i915_address_space *vm)
{
return i915_is_ggtt(vm) && vm->mm.color_adjust;
}
/* The Graphics Translation Table is the way in which GEN hardware translates a
* Graphics Virtual Address into a Physical Address. In addition to the normal
* collateral associated with any va->pa translations GEN hardware also has a

22
drivers/gpu/drm/i915/i915_vma.c
View File

@ -477,7 +477,7 @@ void __i915_vma_set_map_and_fenceable(struct i915_vma *vma)
vma->flags &= ~I915_VMA_CAN_FENCE;
}
bool i915_gem_valid_gtt_space(struct i915_vma *vma, unsigned long cache_level)
bool i915_gem_valid_gtt_space(struct i915_vma *vma, unsigned long color)
{
struct drm_mm_node *node = &vma->node;
struct drm_mm_node *other;
@ -489,7 +489,7 @@ bool i915_gem_valid_gtt_space(struct i915_vma *vma, unsigned long cache_level)
* these constraints apply and set the drm_mm.color_adjust
* appropriately.
*/
if (vma->vm->mm.color_adjust == NULL)
if (!i915_vm_has_cache_coloring(vma->vm))
return true;
/* Only valid to be called on an already inserted vma */
@ -497,12 +497,12 @@ bool i915_gem_valid_gtt_space(struct i915_vma *vma, unsigned long cache_level)
GEM_BUG_ON(list_empty(&node->node_list));
other = list_prev_entry(node, node_list);
if (i915_node_color_differs(other, cache_level) &&
if (i915_node_color_differs(other, color) &&
!drm_mm_hole_follows(other))
return false;
other = list_next_entry(node, node_list);
if (i915_node_color_differs(other, cache_level) &&
if (i915_node_color_differs(other, color) &&
!drm_mm_hole_follows(node))
return false;
@ -539,7 +539,7 @@ static int
i915_vma_insert(struct i915_vma *vma, u64 size, u64 alignment, u64 flags)
{
struct drm_i915_private *dev_priv = vma->vm->i915;
unsigned int cache_level;
unsigned long color;
u64 start, end;
int ret;
@ -580,14 +580,14 @@ i915_vma_insert(struct i915_vma *vma, u64 size, u64 alignment, u64 flags)
return -ENOSPC;
}
color = 0;
if (vma->obj) {
ret = i915_gem_object_pin_pages(vma->obj);
if (ret)
return ret;
cache_level = vma->obj->cache_level;
} else {
cache_level = 0;
if (i915_vm_has_cache_coloring(vma->vm))
color = vma->obj->cache_level;
}
GEM_BUG_ON(vma->pages);
@ -605,7 +605,7 @@ i915_vma_insert(struct i915_vma *vma, u64 size, u64 alignment, u64 flags)
}
ret = i915_gem_gtt_reserve(vma->vm, &vma->node,
size, offset, cache_level,
size, offset, color,
flags);
if (ret)
goto err_clear;
@ -644,7 +644,7 @@ i915_vma_insert(struct i915_vma *vma, u64 size, u64 alignment, u64 flags)
}
ret = i915_gem_gtt_insert(vma->vm, &vma->node,
size, alignment, cache_level,
size, alignment, color,
start, end, flags);
if (ret)
goto err_clear;
@ -653,7 +653,7 @@ i915_vma_insert(struct i915_vma *vma, u64 size, u64 alignment, u64 flags)
GEM_BUG_ON(vma->node.start + vma->node.size > end);
}
GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
GEM_BUG_ON(!i915_gem_valid_gtt_space(vma, cache_level));
GEM_BUG_ON(!i915_gem_valid_gtt_space(vma, color));
mutex_lock(&vma->vm->mutex);
list_move_tail(&vma->vm_link, &vma->vm->bound_list);

2
drivers/gpu/drm/i915/i915_vma.h
View File

@ -295,7 +295,7 @@ i915_vma_compare(struct i915_vma *vma,
int i915_vma_bind(struct i915_vma *vma, enum i915_cache_level cache_level,
u32 flags);
bool i915_gem_valid_gtt_space(struct i915_vma *vma, unsigned long cache_level);
bool i915_gem_valid_gtt_space(struct i915_vma *vma, unsigned long color);
bool i915_vma_misplaced(const struct i915_vma *vma,
u64 size, u64 alignment, u64 flags);
void __i915_vma_set_map_and_fenceable(struct i915_vma *vma);

10
drivers/gpu/drm/i915/selftests/i915_gem_evict.c
View File

@ -274,12 +274,14 @@ static int igt_evict_for_cache_color(void *arg)
LIST_HEAD(objects);
int err;
/* Currently the use of color_adjust is limited to cache domains within
* the ggtt, and so the presence of mm.color_adjust is assumed to be
* i915_ggtt_color_adjust throughout our driver, so using a mock color
* adjust will work just fine for our purposes.
/*
* Currently the use of color_adjust for the GGTT is limited to cache
* coloring and guard pages, and so the presence of mm.color_adjust for
* the GGTT is assumed to be i915_ggtt_color_adjust, hence using a mock
* color adjust will work just fine for our purposes.
*/
ggtt->vm.mm.color_adjust = mock_color_adjust;
GEM_BUG_ON(!i915_vm_has_cache_coloring(&ggtt->vm));
obj = i915_gem_object_create_internal(i915, I915_GTT_PAGE_SIZE);
if (IS_ERR(obj)) {