From: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx>
The RS_CTX_ENABLE and CTX_SAVE_INHIBIT bits are not present on ICL
anymore, but we still try to set them and then check them with
GEM_BUG_ON, resulting in a BUG() call. The bug can be reproduced by
igt/drv_selftest/live_hangcheck/others-priority and our CI was able
to catch it.
It is worth noticing that commit 05f0addd9b10 ("drm/i915/icl: Enhanced
execution list support") already tried to avoid the save bits
on ICL, but only inside populate_lr_context().
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
Testcase: igt/drv_selftest/live_hangcheck/others-priority
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=107399
References: 05f0addd9b10 ("drm/i915/icl: Enhanced execution list support")
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20180809235852.24516-1-paulo.r.zanoni@xxxxxxxxx
Reviewed-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/intel_lrc.c | 14 ++++++--------
1 file changed, 6 insertions(+), 8 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index e5385dbfcdda..3f90c74038ef 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -541,11 +541,6 @@ static void inject_preempt_context(struct intel_engine_cs *engine)
GEM_BUG_ON(execlists->preempt_complete_status !=
upper_32_bits(ce->lrc_desc));
- GEM_BUG_ON((ce->lrc_reg_state[CTX_CONTEXT_CONTROL + 1] &
- _MASKED_BIT_ENABLE(CTX_CTRL_ENGINE_CTX_RESTORE_INHIBIT |
- CTX_CTRL_ENGINE_CTX_SAVE_INHIBIT)) !=
- _MASKED_BIT_ENABLE(CTX_CTRL_ENGINE_CTX_RESTORE_INHIBIT |
- CTX_CTRL_ENGINE_CTX_SAVE_INHIBIT));
/*
* Switch to our empty preempt context so
@@ -2582,10 +2577,13 @@ static void execlists_init_reg_state(u32 *regs,
MI_LRI_FORCE_POSTED;
CTX_REG(regs, CTX_CONTEXT_CONTROL, RING_CONTEXT_CONTROL(engine),
- _MASKED_BIT_DISABLE(CTX_CTRL_ENGINE_CTX_RESTORE_INHIBIT |
- CTX_CTRL_ENGINE_CTX_SAVE_INHIBIT |
- CTX_CTRL_RS_CTX_ENABLE) |
+ _MASKED_BIT_DISABLE(CTX_CTRL_ENGINE_CTX_RESTORE_INHIBIT) |
_MASKED_BIT_ENABLE(CTX_CTRL_INHIBIT_SYN_CTX_SWITCH));
+ if (INTEL_GEN(dev_priv) < 11) {
+ regs[CTX_CONTEXT_CONTROL + 1] |=
+ _MASKED_BIT_DISABLE(CTX_CTRL_ENGINE_CTX_SAVE_INHIBIT |
+ CTX_CTRL_RS_CTX_ENABLE);
+ }
CTX_REG(regs, CTX_RING_HEAD, RING_HEAD(base), 0);
CTX_REG(regs, CTX_RING_TAIL, RING_TAIL(base), 0);
CTX_REG(regs, CTX_RING_BUFFER_START, RING_START(base), 0);
--
2.18.0
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