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Date: Sat, 7 Sep 2013 15:45:50 +0200 From: Tom Gundersen <teg@...m.no> To: David Herrmann <dh.herrmann@...il.com> Cc: "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>, LKML <linux-kernel@...r.kernel.org>, Daniel Vetter <daniel.vetter@...ll.ch> Subject: Re: [REGRESSION] v3.12-rc1: i915_driver_load oopses when sysfb enabled On Sat, Sep 7, 2013 at 2:40 PM, David Herrmann <dh.herrmann@...il.com> wrote: > On Fri, Sep 6, 2013 at 2:10 PM, Tom Gundersen <teg@...m.no> wrote: >> Hi guys, >> >> With current git (v3.11-5058-g57d7309) I get the following oops: >> >> [ 5.434312] ------------[ cut here ]------------ >> [ 5.434318] WARNING: CPU: 2 PID: 199 at arch/x86/mm/ioremap.c:171 >> __ioremap_caller+0x2e3/0x390() >> [ 5.434321] Info: mapping multiple BARs. Your kernel is fine. >> [ 5.434323] Modules linked in: >> [ 5.434326] arc4 coretemp x86_pkg_temp_thermal intel_powerclamp >> brcmsmac kvm_intel kvm cordic brcmutil crc32_pclmul mac80211 >> crc32c_intel ghash_clmulni_intel cfg80211 rfkill iTCO_wdt evdev >> iTCO_vendor_support aesni_intel aes_x86_64 glue_helper lrw gf128mul >> ablk_helper cryptd applesmc input_polldev hwmon microcode bcma >> snd_hda_codec_hdmi snd_hda_codec_cirrus fbcon bitblit fbcon_rotate >> fbcon_ccw fbcon_ud fbcon_cw softcursor font i915(+) snd_hda_intel >> snd_hda_codec ac video snd_hwdep intel_agp apple_bl battery button >> snd_pcm intel_gtt snd_page_alloc drm_kms_helper shpchp backlight >> snd_timer i2c_i801 lpc_ich snd mfd_core soundcore processor ext4 crc16 >> mbcache jbd2 sd_mod crc_t10dif ahci libahci libata ehci_pci scsi_mod >> xhci_hcd ehci_hcd usbcore usb_common >> [ 5.434383] CPU: 2 PID: 199 Comm: systemd-udevd Not tainted >> 3.11.0-TEG-05060-g0312d0c #81 >> [ 5.434386] Hardware name: Apple Inc. >> MacBookAir5,1/Mac-66F35F19FE2A0D05, BIOS MBA51.88Z.00EF.B01.1207271122 >> 07/27/2012 >> [ 5.434390] 0000000000000009 ffff880168f87898 ffffffff8145be63 >> ffff880168f878e0 >> [ 5.434394] ffff880168f878d0 ffffffff8104b17d ffffc9000c080000 >> 00000000a0000000 >> [ 5.434398] ffffc9000c080000 ffffc9000c080000 0000000010000000 >> ffff880168f87930 >> [ 5.434403] Call Trace: >> [ 5.434409] [<ffffffff8145be63>] dump_stack+0x54/0x8d >> [ 5.434413] [<ffffffff8104b17d>] warn_slowpath_common+0x7d/0xa0 >> [ 5.434417] [<ffffffff8104b1ec>] warn_slowpath_fmt+0x4c/0x50 >> [ 5.434421] [<ffffffff81051fdc>] ? iomem_map_sanity_check+0xac/0xe0 >> [ 5.434425] [<ffffffff8103e8b3>] __ioremap_caller+0x2e3/0x390 >> [ 5.434430] [<ffffffff8103e9f2>] ioremap_wc+0x32/0x40 >> [ 5.434450] [<ffffffffa043f960>] i915_driver_load+0x670/0xf50 [i915] >> [ 5.434467] [<ffffffff8131540d>] ? drm_get_minor+0x1ad/0x200 >> [ 5.434471] [<ffffffff81317509>] drm_get_pci_dev+0x129/0x2f0 >> [ 5.434487] [<ffffffffa043c63c>] i915_pci_probe+0x2c/0x70 [i915] >> [ 5.434493] [<ffffffff8127f624>] pci_device_probe+0x84/0xe0 >> [ 5.434502] [<ffffffff81331977>] driver_probe_device+0x87/0x3a0 >> [ 5.434509] [<ffffffff81331d63>] __driver_attach+0x93/0xa0 >> [ 5.434516] [<ffffffff81331cd0>] ? __device_attach+0x40/0x40 >> [ 5.434521] [<ffffffff8132f813>] bus_for_each_dev+0x63/0xa0 >> [ 5.434525] [<ffffffff813313ce>] driver_attach+0x1e/0x20 >> [ 5.434529] [<ffffffff81330f40>] bus_add_driver+0x200/0x2d0 >> [ 5.434533] [<ffffffffa04dc000>] ? 0xffffffffa04dbfff >> [ 5.434538] [<ffffffff813323e4>] driver_register+0x64/0xf0 >> [ 5.434541] [<ffffffffa04dc000>] ? 0xffffffffa04dbfff >> [ 5.434545] [<ffffffff8127f45d>] __pci_register_driver+0x4d/0x50 >> [ 5.434549] [<ffffffff813177e5>] drm_pci_init+0x115/0x130 >> [ 5.434552] [<ffffffffa04dc000>] ? 0xffffffffa04dbfff >> [ 5.434567] [<ffffffffa04dc066>] i915_init+0x66/0x68 [i915] >> [ 5.434570] [<ffffffff8100022a>] do_one_initcall+0x5a/0x1b0 >> [ 5.434575] [<ffffffff81071588>] ? __blocking_notifier_call_chain+0x58/0x70 >> [ 5.434581] [<ffffffff810af52a>] load_module+0x1b0a/0x25a0 >> [ 5.434584] [<ffffffff810abf70>] ? store_uevent+0x40/0x40 >> [ 5.434589] [<ffffffff810b0136>] SyS_finit_module+0x86/0xb0 >> [ 5.434594] [<ffffffff81463da7>] tracesys+0xdd/0xe2 >> [ 5.434599] ---[ end trace 4f93e77fcaaac9b7 ]--- >> >> >> >> >> This only happens when either simplefb or efifb is enabled. I can not >> reproduce the problem on v3.11 with efifb enabled so it appears to be >> new. > > It seems to be unrelated to the x86-sysfb changes. The WARN_ON > triggered here obviously means that i915 remaps VMEM before removing > efifb. So either i915 now calls ioremap and friends _before_ calling > remove_conflicting_framebuffers(), or efifb is not unloaded correctly. I redid all the tests, and I'm now not able to reproduce this with efifb, only with simplefb (not sure if I made a mistake before or if some config changed). I attached the two different dmesg outputs (only difference is X86_SYSFB). > Tom, some things off the top of my head: > - Is efifb still running after i915 loaded? You can see that via: > cat /sys/class/graphics/fb0/name > (and also fb1, fb2, ... whatever is there) > If it's not running, anymore, then it's quite likely an i915 issue. I only have /sys/class/graphics/fb0/name and it says inteldrmfb (this is after i915 has taken over from simplefb). > - Do you get a "fb: conflicting hw usage ..." in your dmesg log? Yes: "fb: conflicting fb hw usage inteldrmfb vs simple - removing generic driver" -t -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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