[Bug 54226] [snb 3.5] stale semaphore sync seqno (typically as seen on bcs->rcs)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=54226

--- Comment #54 from Chris Wilson <chris at chris-wilson.co.uk> ---
(In reply to comment #52)
> Created attachment 76196 [details]
> i915_error_state (kernel 3.8.1 Fedora) with path (write mbox regs twice on
> snb, v2)
> 
> I am applied patch "write mbox regs twice on snb, v2" but still have problem
> [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU hung

0x00052cc8:      0x18800100: MI_BATCH_BUFFER_START
0x00052ccc:      0x0d59b000:    dword 1
0x00052cd0:      0x13000001: MI_FLUSH_DW post_sync_op='no write' 
0x00052cd4:      0x000000c4:    address
0x00052cd8:      0x00000000:    dword
0x00052cdc:      0x00000000: MI_NOOP
0x00052ce0:      0x11000001: MI_LOAD_REGISTER_IMM
0x00052ce4:      0x00002044:    dword 1
0x00052ce8:      0x0007a582:    dword 2
0x00052cec:      0x11000001: MI_LOAD_REGISTER_IMM
0x00052cf0:      0x00012040:    dword 1
0x00052cf4:      0x0007a582:    dword 2
0x00052cf8:      0x10800001: MI_STORE_DATA_INDEX
0x00052cfc:      0x00000080:    index
0x00052d00:      0x0007a582:    dword
0x00052d04:      0x01000000: MI_USER_INTERRUPT

That's only a single LRI per semaphore, the patch wasn't tested.

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