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
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
Cc: Mika Kuoppala <mika.kuoppala@xxxxxxxxx>
---
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 6e61738fab31..a3d826bb216b 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1462,7 +1462,10 @@ 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;
}
@@ -1519,7 +1522,8 @@ 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 0618dd34c3ec..8d35a3978f9b 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -2450,6 +2450,8 @@ 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)) {
--
2.8.1
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