[Nouveau] Nouveau soft lockup after switcheroo'd...

[Daniel J Blueman]

On 13 October 2012 15:12, Daniel J Blueman <daniel at quora.org> wrote:
> On my Macbook Retina, when switching to the integrated GPU, we see a
> ioread32 issued to the discrete GPU, which hangs as it is in D3 [1]
> (drm.debug is set to 14 here).
>
> Full kernel 3.6.2 boot logs with drm.debug=5 are at:
> http://quora.org/2012/mbp-i915-panel.txt
>
> What additional information will help debug this?

I'm seeing this on 3.7-rc2 also:

cat /sys/kernel/debug/vgaswitcheroo/switch
0:DIS:+:Pwr:0000:01:00.0
1:IGD: :Pwr:0000:00:02.0
2:DIS-Audio: :Pwr:0000:01:00.1

echo IGD >/sys/kernel/debug/vgaswitcheroo/switch
echo OFF >/sys/kernel/debug/vgaswitcheroo/switch

after boot+40s:

BUG: soft lockup - CPU#0 stuck for 22s! [Xorg:1703]
Modules linked in: dm_crypt snd_hda_codec_hdmi bnep rfcomm parport_pc
ppdev nfsd nfs_acl auth_rpcgss nfs binfmt_misc fscache lockd sunrpc
joydev arc4 coretemp kvm_intel b43 kvm mac80211 cfg80211 ssb btusb
snd_hda_codec_cirrus applesmc input_polldev microcode bluetooth
bcm5974 snd_hda_intel snd_hda_codec nouveau snd_seq_midi snd_rawmidi
snd_hwdep bcma lpc_ich snd_seq_midi_event snd_pcm mei snd_seq
snd_timer snd_seq_device ttm mxm_wmi wmi snd soundcore snd_page_alloc
nls_iso8859_1 apple_gmux mac_hid apple_bl lp parport hid_generic
hid_apple usbhid hid btrfs zlib_deflate libcrc32c ghash_clmulni_intel
aesni_intel ablk_helper cryptd lrw aes_x86_64 xts gf128mul i915
drm_kms_helper sdhci_pci sdhci drm i2c_algo_bit tg3 video
CPU 0
Pid: 1703, comm: Xorg Not tainted 3.7.0-030700rc2-generic
#201210201535 Apple Inc. MacBookPro10,1/Mac-C3EC7CD22292981F
RIP: 0010:[<ffffffff813469fa>] [<ffffffff813469fa>] ioread32+0x3a/0x40
RSP: 0018:ffff880260577b28 EFLAGS: 00000296
RAX: 00000000ffffffff RBX: ffff880260577b90 RCX: 0000000080000000
RDX: 0000000010000000 RSI: 0000000077359400 RDI: ffffc9001d909410
RBP: ffff880260577b28 R08: 0000000000000000 R09: ffff880263d63798
R10: 0000000000000000 R11: 0000000000000246 R12: ffff88026f3d0968
R13: 0000000000000000 R14: ffffffff81049dc0 R15: ffff880260577ac8
FS: 00007f912f03e880(0000) GS:ffff88026f200000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9131bf7d00 CR3: 0000000264192000 CR4: 00000000001407f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process Xorg (pid: 1703, threadinfo ffff880260576000, task ffff8802605bc4a0)
Stack:
 ffff880260577b58 ffffffffa037c538 0000000000000296 ffff8802612a3000
 0000000077359400 000000000061d004 ffff880260577bb8 ffffffffa037bfec
 ffff8802605bc4a0 000000000061d004 ffffffffffffffff 0000000081172756
Call Trace:
 [<ffffffffa037c538>] nv04_timer_read+0x28/0x70 [nouveau]
 [<ffffffffa037bfec>] nouveau_timer_wait_eq+0x7c/0xe0 [nouveau]
 [<ffffffffa03f4f4e>] nvd0_sor_dpms+0xde/0x1a0 [nouveau]
 [<ffffffff813871d9>] ? fb_set_var+0xe9/0x3a0
 [<ffffffff811554a9>] ? __pte_alloc+0xa9/0x160
 [<ffffffffa03f4e70>] ? nvd0_sor_dp_link_set+0x2c0/0x2c0 [nouveau]
 [<ffffffffa00b2a5c>] drm_helper_connector_dpms+0xbc/0x100 [drm_kms_helper]
 [<ffffffffa00b1665>] drm_fb_helper_dpms.isra.13+0xa5/0xf0 [drm_kms_helper]
 [<ffffffffa00b16f9>] drm_fb_helper_blank+0x49/0x80 [drm_kms_helper]
 [<ffffffff81386e16>] fb_blank+0x56/0xc0
 [<ffffffff813887bb>] do_fb_ioctl+0x59b/0x5f0
 [<ffffffff81152883>] ? vma_interval_tree_insert+0x83/0x90
 [<ffffffff81388af5>] fb_ioctl+0x45/0x50
 [<ffffffff8119adda>] do_vfs_ioctl+0x8a/0x340
 [<ffffffff8119b121>] sys_ioctl+0x91/0xb0
 [<ffffffff81189862>] ? sys_read+0x52/0xa0
 [<ffffffff816b9899>] system_call_fastpath+0x16/0x1b
Code: ff 00 00 01 00 76 0a 0f b7 d7 ed 5d c3 0f 1f 40 00 48 c7 c6 81
4b a5 81 e8 24 fe ff ff b8 ff ff ff ff 5d c3 0f 1f 44 00 00 8b 07 <5d>
c3 0f 1f 40 00 55 48 81 ff ff ff 03 00 48 89 e5 77 2b 48 81
-- 
Daniel J Blueman