We have testcases to ensure that seqno wraparound works fine, so we can
forgo forcing everyone to encounter seqno wraparound during early
uptime. seqno wraparound incurs a full GPU stall so not forcing it
will eliminate one jitter from the early system.
Advancing the global next_seqno after a GPU reset is equally pointless.
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_gem.c | 16 +---------------
1 file changed, 1 insertion(+), 15 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 0cfdd971e8d7..2c3e36e19cb0 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -4774,14 +4774,6 @@ i915_gem_init_hw(struct drm_device *dev)
}
}
- /*
- * Increment the next seqno by 0x100 so we have a visible break
- * on re-initialisation
- */
- ret = i915_gem_set_seqno(dev, dev_priv->next_seqno+0x100);
- if (ret)
- goto out;
-
/* Now it is safe to go back round and do everything else: */
for_each_ring(ring, dev_priv, i) {
struct drm_i915_gem_request *req;
@@ -4969,13 +4961,7 @@ i915_gem_load(struct drm_device *dev)
dev_priv->num_fence_regs =
I915_READ(vgtif_reg(avail_rs.fence_num));
- /*
- * Set initial sequence number for requests.
- * Using this number allows the wraparound to happen early,
- * catching any obvious problems.
- */
- dev_priv->next_seqno = ((u32)~0 - 0x1100);
- dev_priv->last_seqno = ((u32)~0 - 0x1101);
+ dev_priv->next_seqno = 1;
/* Initialize fence registers to zero */
INIT_LIST_HEAD(&dev_priv->mm.fence_list);
--
2.6.2
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