* Christoph Mathys | 2015-12-21 14:19:10 [+0100]: >While playing with 4.1.13-rt15 I stumbled across the following thread >where Luis reports the same problem with i915 gpu: >i915: sleeping function called from invalid context at >intel_pipe_update_start/end >http://www.spinics.net/lists/linux-rt-users/msg13543.html > >Sebastian suggested to set i915.use_mmio_flip to -1. I tried this, and >this avoids the callstack that I've posted before >(intel_mmio_flip_work). The BUG below is now the dominant one: perfect. |BUG: sleeping function called from invalid context at kernel/locking/rtmutex.c:917 |in_atomic(): 0, irqs_disabled(): 1, pid: 2109, name: Xorg |hardirqs last disabled at (23744596): [<ffffffffa02bca93>] intel_pipe_update_start+0x113/0x640 [i915] |Call Trace: | [<ffffffff81802c33>] dump_stack+0x4a/0x61 | [<ffffffff8108713a>] ___might_sleep+0x13a/0x200 | [<ffffffff8180a5e4>] rt_spin_lock+0x24/0x60 | [<ffffffff8108b47c>] ? migrate_disable+0x6c/0xe0 | [<ffffffff810a95fb>] prepare_to_wait+0x2b/0xa0 | [<ffffffffa02bcb48>] intel_pipe_update_start+0x1c8/0x640 [i915] | [<ffffffff810a9ac0>] ? prepare_to_wait_event+0x130/0x130 | [<ffffffffa02a7fc6>] intel_begin_crtc_commit+0x166/0x1e0 [i915] | [<ffffffffa02146f2>] drm_plane_helper_commit+0x112/0x2c0 [drm_kms_helper] | [<ffffffffa021493a>] drm_plane_helper_update+0x9a/0xf0 I have to admit, the i915 tries very hard to avoid running on -RT. Could you try the s/local_irq_disable();/local_irq_disable_nort();/ patch mentioned in the thread? Anyone of the i915 hackers an idea how could get the i915 working without disabling interrupts? Is really required? Sebastian _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
