From 157d2c7fad0863222f6f3b11c4690f2a6e74d809 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Fri, 13 May 2016 11:57:22 +0100 Subject: [PATCH] drm/i915: Stop automatically retiring requests after a GPU hang Following a GPU hang, we break out of the request loop in order to unlock the struct_mutex for use by the GPU reset. However, if we retire all the requests at that moment, we cannot identify the guilty request after performing the reset. v2: Not automatically retiring requests forces us to recheck for available ringspace. Fixes: f4457ae71fd6 ("drm/i915: Prevent leaking of -EIO from i915_wait_request()") Testcase: igt/gem_reset_stats/ban-* Signed-off-by: Chris Wilson Cc: Daniel Vetter Cc: Mika Kuoppala Tested-by: Mika Kuoppala Reviewed-by: Mika Kuoppala Link: http://patchwork.freedesktop.org/patch/msgid/1463137042-9669-4-git-send-email-chris@chris-wilson.co.uk (cherry picked from commit e075a32f515becef66dc849f5eca47409ccf5473) Signed-off-by: Jani Nikula --- drivers/gpu/drm/i915/i915_gem.c | 8 ++++++-- drivers/gpu/drm/i915/intel_ringbuffer.c | 2 ++ 2 files changed, 8 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index 640c6c1ee72e..5677c4b908cd 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -1456,7 +1456,10 @@ i915_wait_request(struct drm_i915_gem_request *req) if (ret) return ret; - __i915_gem_request_retire__upto(req); + /* If the GPU hung, we want to keep the requests to find the guilty. */ + if (req->reset_counter == i915_reset_counter(&dev_priv->gpu_error)) + __i915_gem_request_retire__upto(req); + return 0; } @@ -1513,7 +1516,8 @@ i915_gem_object_retire_request(struct drm_i915_gem_object *obj, else if (obj->last_write_req == req) i915_gem_object_retire__write(obj); - __i915_gem_request_retire__upto(req); + if (req->reset_counter == i915_reset_counter(&req->i915->gpu_error)) + __i915_gem_request_retire__upto(req); } /* A nonblocking variant of the above wait. This is a highly dangerous routine diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c index b1d3eb5b381d..04402bb9d26b 100644 --- a/drivers/gpu/drm/i915/intel_ringbuffer.c +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c @@ -2456,6 +2456,8 @@ int intel_ring_begin(struct drm_i915_gem_request *req, int num_dwords) return ret; intel_ring_update_space(ringbuf); + if (unlikely(ringbuf->space < wait_bytes)) + return -EAGAIN; } if (unlikely(need_wrap)) {