There are some allocations that must be only referenced by 32-bit
offsets. To limit the chances of having the first 4GB already full,
objects not requiring this workaround use DRM_MM_SEARCH_BELOW/
DRM_MM_CREATE_TOP flags
In specific, any resource used with flat/heapless (0x00000000-0xfffff000)
General State Heap (GSH) or Intructions State Heap (ISH) must be in a
32-bit range, because the General State Offset and Instruction State
Offset are limited to 32-bits.
Objects must have EXEC_OBJECT_SUPPORTS_48BADDRESS flag to indicate if
they can be allocated above the 32-bit address range.
v2: Changed flag logic from neeeds_32b, to supports_48b.
v3: Moved 48-bit support flag back to exec_object. (Chris, Daniel)
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Daniel Vetter <daniel@xxxxxxxx>
Signed-off-by: Michel Thierry <michel.thierry@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_drv.h | 1 +
drivers/gpu/drm/i915/i915_gem.c | 19 +++++++++++++++++--
drivers/gpu/drm/i915/i915_gem_execbuffer.c | 7 +++++++
include/uapi/drm/i915_drm.h | 3 ++-
4 files changed, 27 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index a6bc27a..57af235 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -2739,6 +2739,7 @@ void i915_gem_vma_destroy(struct i915_vma *vma);
#define PIN_OFFSET_BIAS (1<<3)
#define PIN_USER (1<<4)
#define PIN_UPDATE (1<<5)
+#define PIN_FULL_RANGE (1<<6)
#define PIN_OFFSET_MASK (~4095)
int __must_check
i915_gem_object_pin(struct drm_i915_gem_object *obj,
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index f4ddf6e..db22559 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -3669,6 +3669,8 @@ i915_gem_object_bind_to_vm(struct drm_i915_gem_object *obj,
struct drm_i915_private *dev_priv = dev->dev_private;
u32 fence_alignment, unfenced_alignment;
u64 size, fence_size;
+ u32 search_flag = DRM_MM_SEARCH_DEFAULT;
+ u32 alloc_flag = DRM_MM_CREATE_DEFAULT;
u64 start =
flags & PIN_OFFSET_BIAS ? flags & PIN_OFFSET_MASK : 0;
u64 end =
@@ -3710,6 +3712,19 @@ i915_gem_object_bind_to_vm(struct drm_i915_gem_object *obj,
obj->tiling_mode,
false);
size = flags & PIN_MAPPABLE ? fence_size : obj->base.size;
+
+ /* Wa32bitGeneralStateOffset & Wa32bitInstructionBaseOffset,
+ * limit address to 4GB-1 for objects requiring this wa; for
+ * others, set alloc flag to TOP.
+ */
+ if (USES_FULL_48BIT_PPGTT(dev)) {
+ if (flags & PIN_FULL_RANGE) {
+ search_flag = DRM_MM_SEARCH_BELOW;
+ alloc_flag = DRM_MM_CREATE_TOP;
+ } else {
+ end = ((4ULL << GEN8_PDPE_SHIFT) - 1);
+ }
+ }
}
if (alignment == 0)
@@ -3752,8 +3767,8 @@ search_free:
size, alignment,
obj->cache_level,
start, end,
- DRM_MM_SEARCH_DEFAULT,
- DRM_MM_CREATE_DEFAULT);
+ search_flag,
+ alloc_flag);
if (ret) {
ret = i915_gem_evict_something(dev, vm, size, alignment,
obj->cache_level,
diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
index 3336e1c..ec8c72d 100644
--- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
@@ -588,6 +588,9 @@ i915_gem_execbuffer_reserve_vma(struct i915_vma *vma,
if (entry->flags & EXEC_OBJECT_NEEDS_GTT)
flags |= PIN_GLOBAL;
+ if (entry->flags & EXEC_OBJECT_SUPPORTS_48BBADDRESS)
+ flags |= PIN_FULL_RANGE;
+
if (!drm_mm_node_allocated(&vma->node)) {
if (entry->flags & __EXEC_OBJECT_NEEDS_MAP)
flags |= PIN_GLOBAL | PIN_MAPPABLE;
@@ -670,6 +673,10 @@ eb_vma_misplaced(struct i915_vma *vma)
if (entry->flags & __EXEC_OBJECT_NEEDS_MAP && !obj->map_and_fenceable)
return !only_mappable_for_reloc(entry->flags);
+ if (!(entry->flags & EXEC_OBJECT_SUPPORTS_48BBADDRESS) &&
+ vma->node.start >= (1ULL << 32))
+ return true;
+
return false;
}
diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index f88cc1c..55ba527 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -685,7 +685,8 @@ struct drm_i915_gem_exec_object2 {
#define EXEC_OBJECT_NEEDS_FENCE (1<<0)
#define EXEC_OBJECT_NEEDS_GTT (1<<1)
#define EXEC_OBJECT_WRITE (1<<2)
-#define __EXEC_OBJECT_UNKNOWN_FLAGS -(EXEC_OBJECT_WRITE<<1)
+#define EXEC_OBJECT_SUPPORTS_48BBADDRESS (1<<3)
+#define __EXEC_OBJECT_UNKNOWN_FLAGS -(EXEC_OBJECT_SUPPORTS_48BBADDRESS<<1)
__u64 flags;
__u64 rsvd1;
--
2.4.3
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