We need to distinguish between full i915_vma structs and simple
drm_mm_nodes when considering eviction (i.e. we must be careful not to
treat a mere drm_mm_node as a much larger i915_vma causing memory
corruption, if we are lucky). To do this, color these not-a-vma with -1
(I915_COLOR_UNEVICTABLE).
v2...v200: New name for -1.
Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
---
drivers/gpu/drm/i915/gvt/aperture_gm.c | 7 +++++--
drivers/gpu/drm/i915/i915_drv.h | 1 +
drivers/gpu/drm/i915/i915_gem.c | 3 ++-
drivers/gpu/drm/i915/i915_gem_execbuffer.c | 2 +-
drivers/gpu/drm/i915/i915_gem_gtt.c | 11 ++++++-----
5 files changed, 15 insertions(+), 9 deletions(-)
diff --git a/drivers/gpu/drm/i915/gvt/aperture_gm.c
b/drivers/gpu/drm/i915/gvt/aperture_gm.c
index 0d41ebc4aea6..7d33b607bc89 100644
--- a/drivers/gpu/drm/i915/gvt/aperture_gm.c
+++ b/drivers/gpu/drm/i915/gvt/aperture_gm.c
@@ -73,12 +73,15 @@ static int alloc_gm(struct intel_vgpu *vgpu, bool high_gm)
mutex_lock(&dev_priv->drm.struct_mutex);
search_again:
ret = drm_mm_insert_node_in_range_generic(&dev_priv->ggtt.base.mm,
- node, size, 4096, 0,
+ node, size, 4096,
+ I915_COLOR_UNEVICTABLE,
start, end, search_flag,
alloc_flag);
if (ret) {
ret = i915_gem_evict_something(&dev_priv->ggtt.base,
- size, 4096, 0, start, end, 0);
+ size, 4096,
+ I915_COLOR_UNEVICTABLE,
+ start, end, 0);
if (ret == 0 && ++retried < 3)
goto search_again;
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 970e50bf9884..b8e65b189635 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -912,6 +912,7 @@ enum i915_cache_level {
the CPU, but L3 is only visible to the GPU. */
I915_CACHE_WT, /* hsw:gt3e WriteThrough for scanouts */
};
+#define I915_COLOR_UNEVICTABLE (-1) /* a non-vma sharing the address space */
#define DEFAULT_CONTEXT_HANDLE 0
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 3d4e07e9734f..097b3154b0ef 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -70,7 +70,8 @@ insert_mappable_node(struct i915_ggtt *ggtt,
{
memset(node, 0, sizeof(*node));
return drm_mm_insert_node_in_range_generic(&ggtt->base.mm, node,
- size, 0, -1,
+ size, 0,
+ I915_COLOR_UNEVICTABLE,
0, ggtt->mappable_end,
DRM_MM_SEARCH_DEFAULT,
DRM_MM_CREATE_DEFAULT);
diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
index 522ecfb4dc9d..8ad6a64c9e01 100644
--- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
@@ -437,7 +437,7 @@ static void *reloc_iomap(struct drm_i915_gem_object *obj,
memset(&cache->node, 0, sizeof(cache->node));
ret = drm_mm_insert_node_in_range_generic
(&ggtt->base.mm, &cache->node,
- 4096, 0, 0,
+ 4096, 0, I915_COLOR_UNEVICTABLE,
0, ggtt->mappable_end,
DRM_MM_SEARCH_DEFAULT,
DRM_MM_CREATE_DEFAULT);
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c
b/drivers/gpu/drm/i915/i915_gem_gtt.c
index b4bde1452f2a..bc210c5ecc13 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -2076,15 +2076,15 @@ static int gen6_ppgtt_allocate_page_directories(struct
i915_hw_ppgtt *ppgtt)
return ret;
alloc:
- ret = drm_mm_insert_node_in_range_generic(&ggtt->base.mm,
- &ppgtt->node, GEN6_PD_SIZE,
- GEN6_PD_ALIGN, 0,
+ ret = drm_mm_insert_node_in_range_generic(&ggtt->base.mm, &ppgtt->node,
+ GEN6_PD_SIZE, GEN6_PD_ALIGN,
+ I915_COLOR_UNEVICTABLE,
0, ggtt->base.total,
DRM_MM_TOPDOWN);
if (ret == -ENOSPC && !retried) {
ret = i915_gem_evict_something(&ggtt->base,
GEN6_PD_SIZE, GEN6_PD_ALIGN,
- I915_CACHE_NONE,
+ I915_COLOR_UNEVICTABLE,
0, ggtt->base.total,
0);
if (ret)
@@ -2760,7 +2760,8 @@ int i915_gem_init_ggtt(struct drm_i915_private *dev_priv)
/* Reserve a mappable slot for our lockless error capture */
ret = drm_mm_insert_node_in_range_generic(&ggtt->base.mm,
&ggtt->error_capture,
- 4096, 0, -1,
+ 4096, 0,
+ I915_COLOR_UNEVICTABLE,
0, ggtt->mappable_end,
0, 0);
if (ret)
--
2.10.2
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