From 953d57eba5192aab638f2d102e0ee7af0c7b970c Mon Sep 17 00:00:00 2001
From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Mon, 28 Oct 2019 20:30:12 +0000
Subject: drm/i915/gem: Limit the blitter sizes to ensure low preemption
 latency
Git-commit: 953d57eba5192aab638f2d102e0ee7af0c7b970c
Patch-mainline: v5.5-rc1
References: bsc#1152489

Currently we insert a arbitration point every 128MiB during a blitter
copy. At 8GiB/s, this is around 30ms. This is a little on the large side
if we need to inject a high priority work, so reduced it down to 8MiB or
roughly 1ms.

v2: Don't forget both fill/copy.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Matthew Auld <matthew.auld@intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191028203012.14566-1-chris@chris-wilson.co.uk
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
---
 drivers/gpu/drm/i915/gem/i915_gem_object_blt.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object_blt.c b/drivers/gpu/drm/i915/gem/i915_gem_object_blt.c
index 516e61e99212..51acffd31575 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_object_blt.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_object_blt.c
@@ -17,7 +17,7 @@ struct i915_vma *intel_emit_vma_fill_blt(struct intel_context *ce,
 					 u32 value)
 {
 	struct drm_i915_private *i915 = ce->vm->i915;
-	const u32 block_size = S16_MAX * PAGE_SIZE;
+	const u32 block_size = SZ_8M; /* ~1ms at 8GiB/s preemption delay */
 	struct intel_engine_pool_node *pool;
 	struct i915_vma *batch;
 	u64 offset;
@@ -201,7 +201,7 @@ struct i915_vma *intel_emit_vma_copy_blt(struct intel_context *ce,
 					 struct i915_vma *dst)
 {
 	struct drm_i915_private *i915 = ce->vm->i915;
-	const u32 block_size = S16_MAX * PAGE_SIZE;
+	const u32 block_size = SZ_8M; /* ~1ms at 8GiB/s preemption delay */
 	struct intel_engine_pool_node *pool;
 	struct i915_vma *batch;
 	u64 src_offset, dst_offset;
-- 
2.28.0