Upon a GPU reset, we copy the default context image over top of the guilty image. This will rollback the CTX_TIMESTAMP register to before our value of ce->runtime.last. Reset both back to 0 so that we do not encounter an underflow on the next schedule out after resume. This should not be a huge issue in practice, as hangs should be rare in correct code. Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx> --- drivers/gpu/drm/i915/gt/intel_lrc.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c index b12355048501..b458f8e17cf5 100644 --- a/drivers/gpu/drm/i915/gt/intel_lrc.c +++ b/drivers/gpu/drm/i915/gt/intel_lrc.c @@ -1154,6 +1154,7 @@ static void restore_default_state(struct intel_context *ce, engine->context_size - PAGE_SIZE); execlists_init_reg_state(regs, ce, engine, ce->ring, false); + ce->runtime.last = intel_context_get_runtime(ce); } static void reset_active(struct i915_request *rq, @@ -4581,6 +4582,7 @@ static void init_common_reg_state(u32 * const regs, regs[CTX_CONTEXT_CONTROL] = ctl; regs[CTX_RING_CTL] = RING_CTL_SIZE(ring->size) | RING_VALID; + regs[CTX_TIMESTAMP] = 0; } static void init_wa_bb_reg_state(u32 * const regs, -- 2.20.1 _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
