[Bug 111050] [CI][BAT] igt at i915_selftest@live_contexts - incomplete - IOMMU and GVT-d SKL platforms

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111050

--- Comment #5 from Martin Peres <martin.peres at free.fr> ---
(In reply to Chris Wilson from comment #4)
> commit 068610895ebd4bd86f496f01eb7b97e56d7269b2 (HEAD ->
> drm-intel-next-queued, drm-intel/for-linux-next,
> drm-intel/drm-intel-next-queued)
> Author: Chris Wilson <chris at chris-wilson.co.uk>
> Date:   Wed Jul 3 18:19:12 2019 +0100
> 
>     drm/i915/gtt: Defer the free for alloc error paths
>     
>     If we hit an error while allocating the page tables, we have to unwind
>     the incomplete updates, and wish to free the unused pd. However, we are
>     not allowed to be hoding the spinlock at that point, and so must use the
>     later free to defer it until after we drop the lock.
>     
>     <3> [414.363795] BUG: sleeping function called from invalid context at
> drivers/gpu/drm/i915/i915_gem_gtt.c:472
>     <3> [414.364167] in_atomic(): 1, irqs_disabled(): 0, pid: 3905, name:
> i915_selftest
>     <4> [414.364406] 3 locks held by i915_selftest/3905:
>     <4> [414.364408]  #0: 0000000034fe8aa8 (&dev->mutex){....}, at:
> device_driver_attach+0x18/0x50
>     <4> [414.364415]  #1: 000000006bd8a560 (&dev->struct_mutex){+.+.}, at:
> igt_ctx_exec+0xb7/0x410 [i915]
>     <4> [414.364476]  #2: 000000003dfdc766 (&(&pd->lock)->rlock){+.+.}, at:
> gen8_ppgtt_alloc_pdp+0x448/0x540 [i915]
>     <3> [414.364529] Preemption disabled at:
>     <4> [414.364530] [<0000000000000000>] 0x0
>     <4> [414.364696] CPU: 0 PID: 3905 Comm: i915_selftest Tainted: G     U  
> 5.2.0-rc7-CI-CI_DRM_6403+ #1
>     <4> [414.364698] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
> BIOS rel-1.10.1-0-g8891697-prebuilt.qemu-project.org 04/01/2014
>     <4> [414.364699] Call Trace:
>     <4> [414.364704]  dump_stack+0x67/0x9b
>     <4> [414.364708]  ___might_sleep+0x167/0x250
>     <4> [414.364777]  vm_free_page+0x24/0xc0 [i915]
>     <4> [414.364852]  free_pd+0xf/0x20 [i915]
>     <4> [414.364897]  gen8_ppgtt_alloc_pdp+0x489/0x540 [i915]
>     <4> [414.364946]  gen8_ppgtt_alloc_4lvl+0x8e/0x2e0 [i915]
>     <4> [414.364992]  ppgtt_bind_vma+0x2e/0x60 [i915]
>     <4> [414.365039]  i915_vma_bind+0xe8/0x2c0 [i915]
>     <4> [414.365088]  __i915_vma_do_pin+0xa1/0xd20 [i915]
>     
>     Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=111050
>     Fixes: 1d1b5490b91c ("drm/i915/gtt: Replace struct_mutex serialisation
> for allocation")
>     Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
>     Cc: Matthew Auld <matthew.auld at intel.com>
>     Cc: Mika Kuoppala <mika.kuoppala at intel.com>
>     Reviewed-by: Mika Kuoppala <mika.kuoppala at linux.intel.com>
>     Link:
> https://patchwork.freedesktop.org/patch/msgid/20190703171913.16585-3-
> chris at chris-wilson.co.uk

Thanks!

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