Messages in this thread Patch in this message | | | Subject | Solved: [PATCH 0/4] mm/gup, drm/i915: refactor gup_fast, convert to pin_user_pages() | From | John Hubbard <> | Date | Thu, 21 May 2020 13:40:39 -0700 |
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On 2020-05-21 12:11, John Hubbard wrote: > On 2020-05-21 11:57, Chris Wilson wrote: >> Quoting John Hubbard (2020-05-19 01:21:20) >>> This needs to go through Andrew's -mm tree, due to adding a new gup.c >>> routine. However, I would really love to have some testing from the >>> drm/i915 folks, because I haven't been able to run-time test that part >>> of it. >> >> CI hit >> >> <4> [185.667750] WARNING: CPU: 0 PID: 1387 at mm/gup.c:2699 >> internal_get_user_pages_fast+0x63a/0xac0
OK, what happened here is that it's WARN()'ing due to passing in the new FOLL_FAST_ONLY flag, which was not added to the whitelist.
So the fix is easy, and should be applied to the refactoring patch. I'll send out a v2 of the series, which will effectively have this applied:
diff --git a/mm/gup.c b/mm/gup.c index 6cbe98c93466..4f0ca3f849d1 100644 --- a/mm/gup.c +++ b/mm/gup.c @@ -2696,7 +2696,8 @@ static int internal_get_user_pages_fast(unsigned long start, int nr_pages, int nr_pinned = 0, ret = 0;
if (WARN_ON_ONCE(gup_flags & ~(FOLL_WRITE | FOLL_LONGTERM | - FOLL_FORCE | FOLL_PIN | FOLL_GET))) + FOLL_FORCE | FOLL_PIN | FOLL_GET | + FOLL_FAST_ONLY))) return -EINVAL;
start = untagged_addr(start) & PAGE_MASK;
>> <4> [185.667752] Modules linked in: vgem snd_hda_codec_hdmi snd_hda_codec_realtek >> snd_hda_codec_generic i915 mei_hdcp x86_pkg_temp_thermal coretemp snd_hda_intel >> snd_intel_dspcfg crct10dif_pclmul snd_hda_codec crc32_pclmul snd_hwdep snd_hda_core >> ghash_clmulni_intel cdc_ether usbnet mii snd_pcm e1000e mei_me ptp pps_core mei >> intel_lpss_pci prime_numbers >> <4> [185.667774] CPU: 0 PID: 1387 Comm: gem_userptr_bli Tainted: G U >> 5.7.0-rc5-CI-Patchwork_17704+ #1 >> <4> [185.667777] Hardware name: Intel Corporation Ice Lake Client Platform/IceLake >> U DDR4 SODIMM PD RVP, BIOS ICLSFWR1.R00.3234.A01.1906141750 06/14/2019 >> <4> [185.667782] RIP: 0010:internal_get_user_pages_fast+0x63a/0xac0 >> <4> [185.667785] Code: 24 40 08 48 39 5c 24 38 49 89 df 0f 85 74 fc ff ff 48 83 44 >> 24 50 08 48 39 5c 24 58 49 89 dc 0f 85 e0 fb ff ff e9 14 fe ff ff <0f> 0b b8 ea ff >> ff ff e9 36 fb ff ff 4c 89 e8 48 21 e8 48 39 e8 0f >> <4> [185.667789] RSP: 0018:ffffc90001133c38 EFLAGS: 00010206 >> <4> [185.667792] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff8884999ee800 >> <4> [185.667795] RDX: 00000000000c0001 RSI: 0000000000000100 RDI: 00007f419e774000 >> <4> [185.667798] RBP: ffff888453dbf040 R08: 0000000000000000 R09: 0000000000000001 >> <4> [185.667800] R10: 0000000000000000 R11: 0000000000000000 R12: ffff888453dbf380 >> <4> [185.667803] R13: ffff8884999ee800 R14: ffff888453dbf3e8 R15: 0000000000000040 >> <4> [185.667806] FS: 00007f419e875e40(0000) GS:ffff88849fe00000(0000) >> knlGS:0000000000000000 >> <4> [185.667808] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >> <4> [185.667811] CR2: 00007f419e873000 CR3: 0000000458bd2004 CR4: 0000000000760ef0 >> <4> [185.667814] PKRU: 55555554 >> <4> [185.667816] Call Trace: >> <4> [185.667912] ? i915_gem_userptr_get_pages+0x1c6/0x290 [i915] >> <4> [185.667918] ? mark_held_locks+0x49/0x70 >> <4> [185.667998] ? i915_gem_userptr_get_pages+0x1c6/0x290 [i915] >> <4> [185.668073] ? i915_gem_userptr_get_pages+0x1c6/0x290 [i915] >> >> and then panicked, across a range of systems. >> -Chris >>
btw, the panic seems to indicate an additional, pre-existing problem: i915_gem_userptr_get_pages(), in this case at least, is not able to recover from a get_user_pages/pin_user_pages failure.
thanks, -- John Hubbard NVIDIA
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