On ke, 2017-01-11 at 18:21 +0000, Chris Wilson wrote:
> The vma->exec_list is still the only means we have for both reserving an
> object in execbuf, and for constructing the eviction list. So during the
> construction of the eviction list, we must treat anything already on the
> exec_list as being pinned.
>
> Yes, this sharing of two semantically different lists will be fixed! But
> in the meantime, we have the issue that this is tripping up CI since we
> started using i915_gem_gtt_reserve_node() + i915_gem_evict_for_node()
> from the regular execbuf reservation path in commit 606fec956c0e
> ("drm/i915: Prefer random replacement before eviction search"):
>
> [ 108.424063] kernel BUG at drivers/gpu/drm/i915/i915_vma.h:254!
> [ 108.424072] invalid opcode: 0000 [#1] PREEMPT SMP
> [ 108.424079] Modules linked in: snd_hda_intel i915 intel_powerclamp coretemp crct10dif_pclmul crc32_pclmul ghash_clmulni_intel snd_hda_codec_hdmi snd_hda_codec_generic snd_hda_codec snd_hwdep snd_hda_core mei_me snd_pcm lpc_ich mei sdhci_pci sdhci mmc_core e1000e ptp pps_core [last unloaded: i915]
> [ 108.424132] CPU: 1 PID: 6865 Comm: gem_cs_tlb Tainted: G U 4.10.0-rc3-CI-CI_DRM_2049+ #1
> [ 108.424143] Hardware name: Hewlett-Packard HP EliteBook 8440p/172A, BIOS 68CCU Ver. F.24 09/13/2013
> [ 108.424154] task: ffff88012ae22600 task.stack: ffffc90000a14000
> [ 108.424220] RIP: 0010:i915_gem_evict_for_node+0x237/0x410 [i915]
> [ 108.424229] RSP: 0018:ffffc90000a17a58 EFLAGS: 00010202
> [ 108.424237] RAX: 0000000000005871 RBX: ffff88012d1ad778 RCX: 0000000000000000
> [ 108.424246] RDX: 000000007ffff000 RSI: ffffc90000a17a68 RDI: ffff880127e694d8
> [ 108.424255] RBP: ffffc90000a17aa0 R08: ffffc90000a17a68 R09: 0000000000000000
> [ 108.424264] R10: 0000000000000001 R11: 0000000000000000 R12: 0000000080000000
> [ 108.424273] R13: ffffc90000a17a68 R14: ffff880127e694d8 R15: ffffffffa0387330
> [ 108.424283] FS: 00007f8236e3d8c0(0000) GS:ffff880137c40000(0000) knlGS:0000000000000000
> [ 108.424293] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 108.424305] CR2: 00007f82347a2000 CR3: 000000012c866000 CR4: 00000000000006e0
> [ 108.424317] Call Trace:
> [ 108.424368] i915_gem_gtt_reserve+0x67/0x80 [i915]
> [ 108.424424] __i915_vma_do_pin+0x248/0x620 [i915]
> [ 108.424487] ? __i915_vma_do_pin+0x162/0x620 [i915]
> [ 108.424540] i915_gem_execbuffer_reserve_vma.isra.8+0x153/0x1f0 [i915]
> [ 108.424591] i915_gem_execbuffer_reserve.isra.9+0x40e/0x440 [i915]
> [ 108.424643] i915_gem_do_execbuffer.isra.15+0x6d9/0x1b20 [i915]
> [ 108.424696] i915_gem_execbuffer2+0xc0/0x250 [i915]
> [ 108.424712] drm_ioctl+0x200/0x450
> [ 108.424760] ? i915_gem_execbuffer+0x330/0x330 [i915]
> [ 108.424776] do_vfs_ioctl+0x90/0x6e0
> [ 108.424789] ? up_read+0x1a/0x40
> [ 108.424800] ? trace_hardirqs_on_caller+0x122/0x1b0
> [ 108.424813] SyS_ioctl+0x3c/0x70
> [ 108.424828] entry_SYSCALL_64_fastpath+0x1c/0xb1
> [ 108.424839] RIP: 0033:0x7f8235867357
> [ 108.424848] RSP: 002b:00007ffdc14504c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
> [ 108.424866] RAX: ffffffffffffffda RBX: 00007ffdc1450600 RCX: 00007f8235867357
> [ 108.424878] RDX: 00007ffdc14505a0 RSI: 0000000040406469 RDI: 0000000000000003
> [ 108.424890] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000022
> [ 108.424903] R10: 0000000000000007 R11: 0000000000000246 R12: 0000000000000002
> [ 108.424915] R13: 0000000000419101 R14: 00007ffdc1450600 R15: 00007ffdc14505f0
> [ 108.424928] Code: 45 b8 8b 4d c0 4c 89 f2 48 89 de ff d0 49 8b 07 4c 8b 45 b8 48 85 c0 75 dd 65 ff 0d d4 a1 c8 5f 0f 84 47 01 00 00 e9 0d fe ff ff <0f> 0b 45 31 f6 4c 8b 65 c8 49 8b 04 24 4d 39 ec 49 8d 9c 24 28
> [ 108.425055] RIP: i915_gem_evict_for_node+0x237/0x410 [i915] RSP: ffffc90000a17a58
>
> Fixes: 172ae5b4c8c1 ("drm/i915: Fix i915_gem_evict_for_vma (soft-pinning)")
> Fixes: 606fec956c0e ("drm/i915: Prefer random replacement before eviction search")
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
Regards, Joonas
--
Joonas Lahtinen
Open Source Technology Center
Intel Corporation
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