drm/i915: Clear engine irq posted following a reset

When the GPU is reset, we want to discard all pending notifications as
either we have manually completed them, or they are no longer
applicable. Make sure we do reset the engine->irq_posted prior to
re-enabling the engine (e.g. the interrupt tasklets) in
i915_gem_reset_finish_engine().

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Michel Thierry <michel.thierry@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20170721123238.16428-11-chris@chris-wilson.co.uk
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 2ff5e23406e510a3e01e02aeac59ed2ff2e10a2b..fcf7fee7ca7192c6b257ede6a49064c3af113dfc 100644 (file)
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2964,6 +2964,8 @@ static bool i915_gem_reset_request(struct drm_i915_gem_request *request)
 void i915_gem_reset_engine(struct intel_engine_cs *engine,
                           struct drm_i915_gem_request *request)
 {
+       engine->irq_posted = 0;
+
        if (request && i915_gem_reset_request(request)) {
                DRM_DEBUG_DRIVER("resetting %s to restart from tail of request 0x%x\n",
                                 engine->name, request->global_seqno);