Re: [PATCH v3 1/2] drm/i915/gtt: Do not initialize drm_mm twice.

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On Wed, 2015-09-23 at 15:55 -0300, Paulo Zanoni wrote:
> 2015-09-23 13:48 GMT-03:00 Imre Deak <imre.deak@xxxxxxxxx>:
> > On ke, 2015-09-16 at 11:49 +0200, Michał Winiarski wrote:
> > > It would be initialized just moments later by i915_init_vm.
> > > 
> > > v2: Commit msg update,
> > >     s/i915_init_vm/i915_address_space_init, move to
> > > i915_gem_gtt.c,
> > >     init address_space during i915_gem_setup_global_gtt for ggtt.
> > > v3: Do not init global_link - we are adding it to vm_list moments
> > > later,
> > >     make i915_address_space_init static, use OOP style parameter
> > > order.
> > > 
> > > Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> > > Cc: Michel Thierry <michel.thierry@xxxxxxxxx>
> > > Cc: Mika Kuoppala <mika.kuoppala@xxxxxxxxx>
> > > Signed-off-by: Michał Winiarski <michal.winiarski@xxxxxxxxx>
> > 
> > With this patch I get the oops below when booting. Looking at it
> > it's
> > caused by dev_priv->gtt being initialized now too late for
> > i915_gem_object_create_stolen_for_preallocated().
> 
> My BDW machine stopped booting, and git bisect tells me this patch is
> the cause. I didn't setup anything to help me grab the logs before
> the
> crash, so I can't confirm the backtrace below.
> 
> Something interesting is that if I boot with i915.modeset=0, then
> later "rmmod i915; modprobe i915 modeset=1", the driver loads
> successfully.

drm/i915: Defer adding preallocated stolen objects to the VM list
from Chris fixes this. I missed it because I usually just reload i915
module after the machine boots - sorry for breaking your setups :(

-Michał
 
> > 
> > [   13.547091] BUG: unable to handle kernel NULL pointer
> > dereference at           (null)
> > [   13.555857] IP: [<ffffffffa0243f09>]
> > i915_gem_object_create_stolen_for_preallocated+0x1e9/0x320 [i915]
> > [   13.566380] PGD 0
> > [   13.568634] Oops: 0002 [#1] PREEMPT SMP
> > [   13.573035] Modules linked in: snd_hda_codec_hdmi snd_hda_intel
> > i915(O+) snd_hda_codec snd_hwdep snd_hda_core snd_pcm snd_seq_dummy
> > snd_seq_oss kvm_intel i2c_algo_bit snd_seq_midi drm_kms_helper kvm
> > snd_rawmidi syscopyarea sysfillrect sysimgblt snd_seq_midi_event
> > crc32c_intel fb_sys_fops microcode snd_seq drm snd_seq_device
> > snd_timer efivars intel_gtt snd agpgart fuse
> > [   13.609814] CPU: 1 PID: 329 Comm: systemd-udevd Tainted: G      
> >     IO    4.3.0-rc2-bxt+ #177
> > [   13.619401] Hardware name: Intel Corp. BROXTON A1
> > PLATFORM/TABLET, BIOS BXTM_IFWI_X64_R_2015_36_4_00 09/02/2015
> > [   13.630681] task: ffff88007674cc80 ti: ffff880075c1c000 task.ti:
> > ffff880075c1c000
> > [   13.639049] RIP: 0010:[<ffffffffa0243f09>]  [<ffffffffa0243f09>]
> > i915_gem_object_create_stolen_for_preallocated+0x1e9/0x320 [i915]
> > [   13.652219] RSP: 0018:ffff880075c1f810  EFLAGS: 00010286
> > [   13.658154] RAX: 0000000000000000 RBX: 00000000008ca000 RCX:
> > ffff880072e61ca8
> > [   13.666129] RDX: ffff880072e61c00 RSI: ffff88006de4a0c8 RDI:
> > ffff88007674d4c8
> > [   13.674103] RBP: ffff880075c1f848 R08: 00000000000196f0 R09:
> > ffff880072e61c00
> > [   13.682078] R10: 0000000000000001 R11: 0000000000000001 R12:
> > ffff88006de49f18
> > [   13.690053] R13: ffff88006df00000 R14: ffff8800754154e0 R15:
> > 0000000000000000
> > [   13.698034] FS:  00007f4d61c0f880(0000)
> > GS:ffff880079480000(0000) knlGS:0000000000000000
> > [   13.707089] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > [   13.713513] CR2: 0000000000000000 CR3: 0000000073304000 CR4:
> > 00000000003406e0
> > [   13.721494] Stack:
> > [   13.723740]  ffff88006de4a048 ffff88006de49e18 ffff880075c1f928
> > ffff880075c1f858
> > [   13.732044]  ffff880072cba540 ffff880076061000 ffff880076061000
> > ffff880075c1f8e8
> > [   13.740345]  ffffffffa027bdbc 0000000000000000 0000000000000000
> > [   13.745411] sdhci-pci 0000:00:1c.0: power state changed by ACPI
> > to D3cold
> > [   13.754373]  0000000000000000
> > 
> > [   13.757903] Call Trace:
> > [   13.760709]  [<ffffffffa027bdbc>]
> > intel_alloc_initial_plane_obj.isra.56+0x7c/0x190 [i915]
> > [   13.769930]  [<ffffffffa0287654>]
> > intel_modeset_init+0xbb4/0x1a10 [i915]
> > [   13.777495]  [<ffffffffa02c03fc>] i915_driver_load+0xeec/0x14e0
> > [i915]
> > [   13.784831]  [<ffffffffa0069569>] drm_dev_register+0xa9/0xc0
> > [drm]
> > [   13.791762]  [<ffffffffa006c37d>] drm_get_pci_dev+0x8d/0x1e0
> > [drm]
> > [   13.798682]  [<ffffffff818c7e42>] ?
> > _raw_spin_unlock_irqrestore+0x42/0x70
> > [   13.806321]  [<ffffffffa0201234>] i915_pci_probe+0x34/0x50
> > [i915]
> > [   13.813144]  [<ffffffff81452cbc>] pci_device_probe+0x8c/0x100
> > [   13.819577]  [<ffffffff8152a5a9>]
> > driver_probe_device+0x169/0x4a0
> > [   13.826393]  [<ffffffff8152a968>] __driver_attach+0x88/0x90
> > [   13.832628]  [<ffffffff8152a8e0>] ?
> > driver_probe_device+0x4a0/0x4a0
> > [   13.839643]  [<ffffffff81528126>] bus_for_each_dev+0x66/0xa0
> > [   13.845976]  [<ffffffff81529f5e>] driver_attach+0x1e/0x20
> > [   13.852012]  [<ffffffff815299b4>] bus_add_driver+0x1f4/0x290
> > [   13.858343]  [<ffffffff8152b540>] driver_register+0x60/0xe0
> > [   13.864577]  [<ffffffff814513b0>]
> > __pci_register_driver+0x60/0x70
> > [   13.871410]  [<ffffffffa006c5b0>] drm_pci_init+0xe0/0x110 [drm]
> > [   13.878034]  [<ffffffff810d024d>] ? trace_hardirqs_on+0xd/0x10
> > [   13.884560]  [<ffffffffa032b000>] ? 0xffffffffa032b000
> > [   13.890350]  [<ffffffffa032b094>] i915_init+0x94/0x9b [i915]
> > [   13.896685]  [<ffffffff810002f3>] do_one_initcall+0xb3/0x1d0
> > [   13.903016]  [<ffffffff810ed246>] ?
> > rcu_read_lock_sched_held+0x86/0x90
> > [   13.910323]  [<ffffffff811e21f1>] ?
> > kmem_cache_alloc_trace+0x1c1/0x270
> > [   13.917626]  [<ffffffff81192893>] ? do_init_module+0x27/0x1ea
> > [   13.924052]  [<ffffffff811928cc>] do_init_module+0x60/0x1ea
> > [   13.930288]  [<ffffffff81114b02>] load_module+0x2012/0x2580
> > [   13.936521]  [<ffffffff811109a0>] ? store_uevent+0x40/0x40
> > [   13.942659]  [<ffffffff81111246>] ?
> > copy_module_from_fd.isra.36+0xf6/0x140
> > [   13.950350]  [<ffffffff81115270>] SyS_finit_module+0x80/0xb0
> > [   13.956681]  [<ffffffff818c86db>]
> > entry_SYSCALL_64_fastpath+0x16/0x73
> > 
> > 
> > > ---
> > >  drivers/gpu/drm/i915/i915_drv.h     |  2 --
> > >  drivers/gpu/drm/i915/i915_gem.c     | 14 --------------
> > >  drivers/gpu/drm/i915/i915_gem_gtt.c | 26 ++++++++++++++++++-----
> > > ---
> > >  3 files changed, 18 insertions(+), 24 deletions(-)
> > > 
> > > diff --git a/drivers/gpu/drm/i915/i915_drv.h
> > > b/drivers/gpu/drm/i915/i915_drv.h
> > > index 3bf8a9b..039227d 100644
> > > --- a/drivers/gpu/drm/i915/i915_drv.h
> > > +++ b/drivers/gpu/drm/i915/i915_drv.h
> > > @@ -2804,8 +2804,6 @@ struct drm_i915_gem_object
> > > *i915_gem_alloc_object(struct drm_device *dev,
> > >                                                 size_t size);
> > >  struct drm_i915_gem_object *i915_gem_object_create_from_data(
> > >               struct drm_device *dev, const void *data, size_t
> > > size);
> > > -void i915_init_vm(struct drm_i915_private *dev_priv,
> > > -               struct i915_address_space *vm);
> > >  void i915_gem_free_object(struct drm_gem_object *obj);
> > >  void i915_gem_vma_destroy(struct i915_vma *vma);
> > > 
> > > diff --git a/drivers/gpu/drm/i915/i915_gem.c
> > > b/drivers/gpu/drm/i915/i915_gem.c
> > > index cb0df7e..4811f8a 100644
> > > --- a/drivers/gpu/drm/i915/i915_gem.c
> > > +++ b/drivers/gpu/drm/i915/i915_gem.c
> > > @@ -4844,18 +4844,6 @@ init_ring_lists(struct intel_engine_cs
> > > *ring)
> > >       INIT_LIST_HEAD(&ring->request_list);
> > >  }
> > > 
> > > -void i915_init_vm(struct drm_i915_private *dev_priv,
> > > -               struct i915_address_space *vm)
> > > -{
> > > -     if (!i915_is_ggtt(vm))
> > > -             drm_mm_init(&vm->mm, vm->start, vm->total);
> > > -     vm->dev = dev_priv->dev;
> > > -     INIT_LIST_HEAD(&vm->active_list);
> > > -     INIT_LIST_HEAD(&vm->inactive_list);
> > > -     INIT_LIST_HEAD(&vm->global_link);
> > > -     list_add_tail(&vm->global_link, &dev_priv->vm_list);
> > > -}
> > > -
> > >  void
> > >  i915_gem_load(struct drm_device *dev)
> > >  {
> > > @@ -4879,8 +4867,6 @@ i915_gem_load(struct drm_device *dev)
> > >                                 NULL);
> > > 
> > >       INIT_LIST_HEAD(&dev_priv->vm_list);
> > > -     i915_init_vm(dev_priv, &dev_priv->gtt.base);
> > > -
> > >       INIT_LIST_HEAD(&dev_priv->context_list);
> > >       INIT_LIST_HEAD(&dev_priv->mm.unbound_list);
> > >       INIT_LIST_HEAD(&dev_priv->mm.bound_list);
> > > diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c
> > > b/drivers/gpu/drm/i915/i915_gem_gtt.c
> > > index 8786281..01f3521 100644
> > > --- a/drivers/gpu/drm/i915/i915_gem_gtt.c
> > > +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
> > > @@ -2121,6 +2121,16 @@ static int __hw_ppgtt_init(struct
> > > drm_device *dev, struct i915_hw_ppgtt *ppgtt)
> > >               return gen8_ppgtt_init(ppgtt);
> > >  }
> > > 
> > > +static void i915_address_space_init(struct i915_address_space
> > > *vm,
> > > +                                 struct drm_i915_private
> > > *dev_priv)
> > > +{
> > > +     drm_mm_init(&vm->mm, vm->start, vm->total);
> > > +     vm->dev = dev_priv->dev;
> > > +     INIT_LIST_HEAD(&vm->active_list);
> > > +     INIT_LIST_HEAD(&vm->inactive_list);
> > > +     list_add_tail(&vm->global_link, &dev_priv->vm_list);
> > > +}
> > > +
> > >  int i915_ppgtt_init(struct drm_device *dev, struct i915_hw_ppgtt
> > > *ppgtt)
> > >  {
> > >       struct drm_i915_private *dev_priv = dev->dev_private;
> > > @@ -2129,9 +2139,7 @@ int i915_ppgtt_init(struct drm_device *dev,
> > > struct i915_hw_ppgtt *ppgtt)
> > >       ret = __hw_ppgtt_init(dev, ppgtt);
> > >       if (ret == 0) {
> > >               kref_init(&ppgtt->ref);
> > > -             drm_mm_init(&ppgtt->base.mm, ppgtt->base.start,
> > > -                         ppgtt->base.total);
> > > -             i915_init_vm(dev_priv, &ppgtt->base);
> > > +             i915_address_space_init(&ppgtt->base, dev_priv);
> > >       }
> > > 
> > >       return ret;
> > > @@ -2618,11 +2626,13 @@ static int
> > > i915_gem_setup_global_gtt(struct drm_device *dev,
> > > 
> > >       BUG_ON(mappable_end > end);
> > > 
> > > -     /* Subtract the guard page ... */
> > > -     drm_mm_init(&ggtt_vm->mm, start, end - start - PAGE_SIZE);
> > > +     ggtt_vm->start = start;
> > > 
> > > -     dev_priv->gtt.base.start = start;
> > > -     dev_priv->gtt.base.total = end - start;
> > > +     /* Subtract the guard page before address space
> > > initialization to
> > > +      * shrink the range used by drm_mm */
> > > +     ggtt_vm->total = end - start - PAGE_SIZE;
> > > +     i915_address_space_init(ggtt_vm, dev_priv);
> > > +     ggtt_vm->total += PAGE_SIZE;
> > > 
> > >       if (intel_vgpu_active(dev)) {
> > >               ret = intel_vgt_balloon(dev);
> > > @@ -2631,7 +2641,7 @@ static int i915_gem_setup_global_gtt(struct
> > > drm_device *dev,
> > >       }
> > > 
> > >       if (!HAS_LLC(dev))
> > > -             dev_priv->gtt.base.mm.color_adjust =
> > > i915_gtt_color_adjust;
> > > +             ggtt_vm->mm.color_adjust = i915_gtt_color_adjust;
> > > 
> > >       /* Mark any preallocated objects as occupied */
> > >       list_for_each_entry(obj, &dev_priv->mm.bound_list,
> > > global_list) {
> > 
> > 
> > _______________________________________________
> > Intel-gfx mailing list
> > Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
> > http://lists.freedesktop.org/mailman/listinfo/intel-gfx
> 
> 
> 
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