[Bug 111197] [skl] assertion hits

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111197

--- Comment #12 from Chris Wilson <chris at chris-wilson.co.uk> ---
The trace is quite short, and there's about 3 flip sequences, but afaict all
seemed to do a back-to-back swap without a GetBuffers after being invalidated.
E.g, the last sequence:

001:<:0320: 32: DRI2-Request(154,8): SwapBuffers drawable=0x0040000c
target_msc_hi=0 target_msc_lo=0 divisor_hi=0 divisor_lo=0 remainder_hi=0
remainder_lo=0
001:<:0321:  4: Request(43): GetInputFocus 
001:>:0321: Event DRI2-BufferSwapComplete(119) drawable=0x00000001
ust_hi=4194316 ust_lo=9 msc_hi=1456050911 msc_lo=4294967295 sbc_hi=3640489432
sbc_lo=2
001:>:0320:32: Reply to SwapBuffers: swap_hi=0 swap_lo=3
001:>:0321:32: Reply to GetInputFocus: revert-to=None(0x00)
focus=PointerRoot(0x00000001)
001:<:0322: 20: DRI2-Request(154,7): GetBuffersWithFormat drawable=0x0040000c
attachments={attachment=BackLeft(0x00000001) format=0x00000020};
001:>:0322:52: Reply to GetBuffersWithFormat: width=1920 height=1080
buffers={attachment=BackLeft(0x00000001) name=0x00000005 pitch=7680 cpp=4
flags=0x00000000};
001:>:0322: Event DRI2-BufferSwapComplete(119) drawable=0x00000002
ust_hi=4194316 ust_lo=9 msc_hi=1456067584 msc_lo=4294967295 sbc_hi=3640489433
sbc_lo=3
001:<:0323: 32: DRI2-Request(154,8): SwapBuffers drawable=0x0040000c
target_msc_hi=0 target_msc_lo=0 divisor_hi=0 divisor_lo=0 remainder_hi=0
remainder_lo=0
001:<:0324:  4: Request(43): GetInputFocus 
001:>:0324: Event DRI2-InvalidateBuffers(120) drawable=0x0040000c
001:>:0323:32: Reply to SwapBuffers: swap_hi=0 swap_lo=4
001:>:0324:32: Reply to GetInputFocus: revert-to=None(0x00)
focus=PointerRoot(0x00000001)
001:<:0325: 20: DRI2-Request(154,7): GetBuffersWithFormat drawable=0x0040000c
attachments={attachment=BackLeft(0x00000001) format=0x00000020};
001:>:0325:52: Reply to GetBuffersWithFormat: width=1920 height=1080
buffers={attachment=BackLeft(0x00000001) name=0x00000003 pitch=7680 cpp=4
flags=0x00000000};
001:<:0326: 32: DRI2-Request(154,8): SwapBuffers drawable=0x0040000c
target_msc_hi=0 target_msc_lo=0 divisor_hi=0 divisor_lo=0 remainder_hi=0
remainder_lo=0
001:<:0327:  4: Request(43): GetInputFocus 
001:>:0327: Event DRI2-InvalidateBuffers(120) drawable=0x0040000c
001:>:0326:32: Reply to SwapBuffers: swap_hi=0 swap_lo=5
001:>:0327:32: Reply to GetInputFocus: revert-to=None(0x00)
focus=PointerRoot(0x00000001)
001:<:0328: 20: DRI2-Request(154,7): GetBuffersWithFormat drawable=0x0040000c
attachments={attachment=BackLeft(0x00000001) format=0x00000020};
001:>:0328: Event DRI2-BufferSwapComplete(119) drawable=0x00000002
ust_hi=4194316 ust_lo=9 msc_hi=1456084246 msc_lo=4294967295 sbc_hi=3640489434
sbc_lo=4
001:>:0328:52: Reply to GetBuffersWithFormat: width=1920 height=1080
buffers={attachment=BackLeft(0x00000001) name=0x00000005 pitch=7680 cpp=4
flags=0x00000000};
001:<:0329: 32: DRI2-Request(154,8): SwapBuffers drawable=0x0040000c
target_msc_hi=0 target_msc_lo=0 divisor_hi=0 divisor_lo=0 remainder_hi=0
remainder_lo=0
001:<:032a:  4: Request(43): GetInputFocus 
001:>:032a: Event DRI2-InvalidateBuffers(120) drawable=0x0040000c
001:>:0329:32: Reply to SwapBuffers: swap_hi=0 swap_lo=6
001:>:032a:32: Reply to GetInputFocus: revert-to=None(0x00)
focus=PointerRoot(0x00000001)
001:<:032b: 32: DRI2-Request(154,8): SwapBuffers drawable=0x0040000c
target_msc_hi=0 target_msc_lo=0 divisor_hi=0 divisor_lo=0 remainder_hi=0
remainder_lo=0
001:<:032c:  4: Request(43): GetInputFocus 
001:>:032c: Event DRI2-BufferSwapComplete(119) drawable=0x00000002
ust_hi=4194316 ust_lo=9 msc_hi=1456100912 msc_lo=4294967295 sbc_hi=3640489435
sbc_lo=5
001:>:032c: Event DRI2-BufferSwapComplete(119) drawable=0x00000002
ust_hi=4194316 ust_lo=9 msc_hi=1456117583 msc_lo=4294967295 sbc_hi=3640489436
sbc_lo=6

Without asserts enabled, we just ignore the swap.

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