On 7/7/2015 4:15 PM, Michel Thierry wrote:
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_48B_ADDRESS flag to indicate if
they can be allocated above the 32-bit address range. To limit the
chances of having the first 4GB already full, objects will use
DRM_MM_SEARCH_BELOW + DRM_MM_CREATE_TOP flags when possible.
v2: Changed flag logic from neeeds_32b, to supports_48b.
v3: Moved 48-bit support flag back to exec_object. (Chris, Daniel)
v4: Split pin flags into PIN_ZONE_4G and PIN_HIGH; update PIN_OFFSET_MASK
to use last PIN_ defined instead of hard-coded value; use correct limit
check in eb_vma_misplaced. (Chris)
v5: Don't touch PIN_OFFSET_MASK and update workaround comment (Chris)
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> (v4)
Signed-off-by: Michel Thierry <michel.thierry@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_drv.h | 2 ++
drivers/gpu/drm/i915/i915_gem.c | 14 ++++++++++++--
drivers/gpu/drm/i915/i915_gem_execbuffer.c | 13 +++++++++++++
include/uapi/drm/i915_drm.h | 3 ++-
4 files changed, 29 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 4a30a73..fc88e58 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -2772,6 +2772,8 @@ 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_ZONE_4G (1<<6)
+#define PIN_HIGH (1<<7)
#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 ebfb789..b13900d 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -3720,6 +3720,8 @@ 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 =
@@ -3761,6 +3763,14 @@ 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;
+
+ if (flags & PIN_HIGH) {
+ search_flag = DRM_MM_SEARCH_BELOW;
+ alloc_flag = DRM_MM_CREATE_TOP;
+ }
+
+ if (flags & PIN_ZONE_4G)
+ end = (1ULL << 32);
Hi Chris,
second thoughts on this... would PIN_HIGH & PIN_ZONE_4G be a problem if
someone mixes a 64-bit kernel with 32-bit userland?
Maybe it's safer to set end = (1ULL << 32) - PAGE_SIZE.
}
if (alignment == 0)
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