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drm/i915: Clear stop-engine for a pardoned reset 

If we pardon a per-engine reset, we may leave the STOP_RING bit asserted
in RING_MI_MODE resulting in the engine hanging. Unconditionally clear
it on the per-engine exit path as we know that either we skipped the
reset and so need the cancellation, or the reset was successful and the
cancellation is a no-op, or there was an error and we will follow up
with a full-reset or wedging (both of which will stop the engines again
as required).

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=107188
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=106560
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180814171857.24673-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2018-08-14 18:18:57 +01:00
parent 08ea70a417
commit a99b32a6ff
3 changed files with 12 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/gpu/drm/i915/i915_drv.c
View File

@ -2079,6 +2079,7 @@ int i915_reset_engine(struct intel_engine_cs *engine, const char *msg)
goto out;
out:
intel_engine_cancel_stop_cs(engine);
i915_gem_reset_finish_engine(engine);
return ret;
}

10
drivers/gpu/drm/i915/intel_engine_cs.c
View File

@ -788,6 +788,16 @@ int intel_engine_stop_cs(struct intel_engine_cs *engine)
return err;
}
void intel_engine_cancel_stop_cs(struct intel_engine_cs *engine)
{
struct drm_i915_private *dev_priv = engine->i915;
GEM_TRACE("%s\n", engine->name);
I915_WRITE_FW(RING_MI_MODE(engine->mmio_base),
_MASKED_BIT_DISABLE(STOP_RING));
}
const char *i915_cache_level_str(struct drm_i915_private *i915, int type)
{
switch (type) {

1
drivers/gpu/drm/i915/intel_ringbuffer.h
View File

@ -906,6 +906,7 @@ int intel_init_blt_ring_buffer(struct intel_engine_cs *engine);
int intel_init_vebox_ring_buffer(struct intel_engine_cs *engine);
int intel_engine_stop_cs(struct intel_engine_cs *engine);
void intel_engine_cancel_stop_cs(struct intel_engine_cs *engine);
u64 intel_engine_get_active_head(const struct intel_engine_cs *engine);
u64 intel_engine_get_last_batch_head(const struct intel_engine_cs *engine);