Bug 94914

Summary: [BAT SNB] gem_exec_store blt asserts after driver reload (drv_module_reload_basic)
Product: DRI Reporter: Tvrtko Ursulin <tvrtko.ursulin>
Component: DRM/IntelAssignee: Intel GFX Bugs mailing list <intel-gfx-bugs>
Status: CLOSED FIXED QA Contact: Intel GFX Bugs mailing list <intel-gfx-bugs>
Severity: critical    
Priority: highest CC: intel-gfx-bugs
Version: DRI git   
Hardware: Other   
OS: All   
Whiteboard:
i915 platform: SNB i915 features: GEM/execlists

Description Tvrtko Ursulin 2016-04-13 09:42:17 UTC 
Looks like this:

Results for igt@drv_module_reload_basic
Overview

Result: fail

Back to summary
Details
Detail 	Value
Returncode 	99
Time 	0:00:00.821593
Stdout 	

Reloading i915.ko with
unbinding /sys/class/vtconsole/vtcon0/: (M) frame buffer device
module successfully unloaded
module successfully loaded again
failed to execute a simple batch after reload

Stderr 	

(gem_exec_store:6557) CRITICAL: Test assertion failure function store_dword, file gem_exec_store.c:93:
(gem_exec_store:6557) CRITICAL: Failed assertion: *batch == 0xc0ffee
(gem_exec_store:6557) CRITICAL: error: 0 != 12648430
Subtest basic-blt failed.
**** DEBUG ****
(gem_exec_store:6557) ioctl-wrappers-DEBUG: Test requirement passed: gem_has_ring(fd, ring)
(gem_exec_store:6557) DEBUG: Test requirement passed: !(gen == 6 && (ring & ~(3<<13)) == I915_EXEC_BSD)
(gem_exec_store:6557) CRITICAL: Test assertion failure function store_dword, file gem_exec_store.c:93:
(gem_exec_store:6557) CRITICAL: Failed assertion: *batch == 0xc0ffee
(gem_exec_store:6557) CRITICAL: error: 0 != 12648430
****  END  ****
(gem_exec_store:6557) CRITICAL: Test assertion failure function store_all, file gem_exec_store.c:204:
(gem_exec_store:6557) CRITICAL: Failed assertion: engines[i] == i
(gem_exec_store:6557) CRITICAL: error: 0xdeadbeef != 0x2
Subtest basic-all failed.
**** DEBUG ****
(gem_exec_store:6557) CRITICAL: Test assertion failure function store_all, file gem_exec_store.c:204:
(gem_exec_store:6557) CRITICAL: Failed assertion: engines[i] == i
(gem_exec_store:6557) CRITICAL: error: 0xdeadbeef != 0x2
****  END  ****

Environment 	

PIGLIT_SOURCE_DIR="/opt/igt/piglit" PIGLIT_PLATFORM="mixed_glx_egl"

Command 	/opt/igt/tests/drv_module_reload_basic
dmesg
Comment 1 Chris Wilson 2016-04-23 22:53:19 UTC 
Interesting to note that both tests failed with the blitter. No hang, and breadcrumb write must have succeeded, but an equivalent STORE_DWORD to the user buffer did not. Still suspect TLB or the aliasing PD?, just a pity it didn't hang.
Comment 2 Jari Tahvanainen 2016-08-30 12:09:19 UTC 
This failure has not been visible in Patchwork Intel GFX CI Testing during August. I propose this to be closed as Resolved + Worksforme. Please comment if you disagree.
Comment 3 yann 2016-08-31 15:03:26 UTC 
I confirmed that this is working on our side also

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