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drm/i915: Stop automatically retiring requests after a GPU hang

Browse source 
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: f4457ae71f ("drm/i915: Prevent leaking of -EIO from i915_wait_request()")
Testcase: igt/gem_reset_stats/ban-*
Signed-off-by: Chris Wilson <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Mika Kuoppala <[email protected]>
Tested-by: Mika Kuoppala <[email protected]>
Reviewed-by: Mika Kuoppala <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]
(cherry picked from commit e075a32f51)
Signed-off-by: Jani Nikula <[email protected]>
This commit is contained in:
Chris Wilson 2016-05-13 11:57:22 +01:00 • committed by Jani Nikula
commit 157d2c7fad
2 changed files with 8 additions and 2 deletions
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8
drivers/gpu/drm/i915/i915_gem.c
View file

@ -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

2
drivers/gpu/drm/i915/intel_ringbuffer.c
View file

@ -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)) {