Hi,
On ti, 2015-12-29 at 12:55 +0200, Gabriel Feceoru wrote:
> This fixes an issue added with: "1f814da drm/i915: add support for
> checking
> if we hold an RPM reference", noticed while running
> drv_module_reload_basic.
>
> WARNING: CPU: 1 PID: 2032 at drivers/gpu/drm/i915/intel_drv.h:1446
> gen6_read32+0x1ca/0x1e0 [i915]()
> [ 138.682686] RPM wakelock ref not held during HW access
> [ 138.682687] Modules linked in:
> [ 138.682688] i915(-) drm_kms_helper drm snd_hda_codec_hdmi
> snd_hda_codec_realtek snd_hda_codec_generic snd_hda_codec snd_hwdep
> x86_pkg_temp_thermal snd_hda_core i2c_algo_bit syscopyarea
> sysfillrect sysimgblt fb_sys_fops xhci_pci ehci_pci r8169 xhci_hcd
> mii ehci_hcd video [last unloaded: snd_hda_intel]
> [ 138.682699] CPU: 1 PID: 2032 Comm: rmmod Tainted: G W
> 4.4.0-rc4+ #44
> [ 138.682701] Hardware name: Dell Inc. Inspiron 3847/088DT1 ,
> BIOS A06 01/15/2015
> [ 138.682702] ffffffffc03b6358 ffff880210d8ba58 ffffffff813e0c0f
> ffff880210d8baa0
> [ 138.682703] ffff880210d8ba90 ffffffff8105f6a2 ffff8800daa40000
> 0000000000064400
> [ 138.682705] 0000000000000004 ffff880210d8bb9c ffff8800daa40000
> ffff880210d8baf0
> [ 138.682706] Call Trace:
> [ 138.682710] [<ffffffff813e0c0f>] dump_stack+0x44/0x55
> [ 138.682713] [<ffffffff8105f6a2>] warn_slowpath_common+0x82/0xc0
> [ 138.682715] [<ffffffff8105f72c>] warn_slowpath_fmt+0x4c/0x50
> [ 138.682725] [<ffffffffc031aefc>] ?
> i915_gem_object_unpin_from_display_plane+0x1c/0x50 [i915]
> [ 138.682734] [<ffffffffc0333b9a>] gen6_read32+0x1ca/0x1e0 [i915]
> [ 138.682737] [<ffffffff8172c562>] ? mutex_lock+0x12/0x30
> [ 138.682747] [<ffffffffc03715ca>]
> intel_ddi_get_hw_state+0x7a/0x180 [i915]
> [ 138.682758] [<ffffffffc0355c88>]
> intel_connector_get_hw_state+0x28/0x30 [i915]
> [ 138.682767] [<ffffffffc03543fc>] intel_atomic_commit+0xa9c/0x17e0
> [i915]
> [ 138.682779] [<ffffffffc00a7e8e>] ?
> drm_atomic_check_only+0x18e/0x590 [drm]
> [ 138.682786] [<ffffffffc00a78cc>] ?
> drm_atomic_add_affected_connectors+0x8c/0xf0 [drm]
> [ 138.682792] [<ffffffffc00a82c7>] drm_atomic_commit+0x37/0x60
> [drm]
> [ 138.682797] [<ffffffffc0163356>]
> drm_atomic_helper_set_config+0x76/0xb0 [drm_kms_helper]
> [ 138.682804] [<ffffffffc00a696a>] ?
> drm_modeset_lock_all_ctx+0x9a/0xb0 [drm]
> [ 138.682809] [<ffffffffc00979c2>]
> drm_mode_set_config_internal+0x62/0x100 [drm]
> [ 138.682814] [<ffffffffc0097b48>]
> drm_framebuffer_remove+0xe8/0x120 [drm]
> [ 138.682826] [<ffffffffc036bb4d>] intel_fbdev_fini+0x6d/0x90
> [i915]
> [ 138.682838] [<ffffffffc0396b9a>] i915_driver_unload+0x1a/0x290
> [i915]
> [ 138.682844] [<ffffffffc0090ff9>] drm_dev_unregister+0x29/0xb0
> [drm]
> [ 138.682848] [<ffffffffc0091673>] drm_put_dev+0x23/0x60 [drm]
> [ 138.682854] [<ffffffffc02dc315>] i915_pci_remove+0x15/0x20 [i915]
> [ 138.682856] [<ffffffff8141f409>] pci_device_remove+0x39/0xc0
> [ 138.682859] [<ffffffff814e3d61>]
> __device_release_driver+0xa1/0x150
> [ 138.682860] [<ffffffff814e4833>] driver_detach+0xa3/0xb0
> [ 138.682862] [<ffffffff814e3825>] bus_remove_driver+0x55/0xd0
> [ 138.682864] [<ffffffff814e4e2c>] driver_unregister+0x2c/0x50
> [ 138.682866] [<ffffffff8141db31>] pci_unregister_driver+0x21/0x90
> [ 138.682871] [<ffffffffc0092ec4>] drm_pci_exit+0x94/0xb0 [drm]
> [ 138.682883] [<ffffffffc0397404>] i915_exit+0x20/0xc1c [i915]
>
> Reported-by: Marius Vlad <marius.c.vlad@xxxxxxxxx>
> Signed-off-by: Gabriel Feceoru <gabriel.feceoru@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/i915_dma.c | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_dma.c
> b/drivers/gpu/drm/i915/i915_dma.c
> index 988a380..08ad01f0 100644
> --- a/drivers/gpu/drm/i915/i915_dma.c
> +++ b/drivers/gpu/drm/i915/i915_dma.c
> @@ -1136,6 +1136,8 @@ int i915_driver_unload(struct drm_device *dev)
> struct drm_i915_private *dev_priv = dev->dev_private;
> int ret;
>
> + intel_runtime_pm_get(dev_priv);
> +
> intel_fbdev_fini(dev);
>
> i915_audio_component_cleanup(dev_priv);
> @@ -1143,6 +1145,7 @@ int i915_driver_unload(struct drm_device *dev)
> ret = i915_gem_suspend(dev);
> if (ret) {
> DRM_ERROR("failed to idle hardware: %d\n", ret);
> + intel_runtime_pm_put(dev_priv);
This should be made into goto construct.
> return ret;
> }
>
> @@ -1221,6 +1224,9 @@ int i915_driver_unload(struct drm_device *dev)
> kmem_cache_destroy(dev_priv->vmas);
> kmem_cache_destroy(dev_priv->objects);
> pci_dev_put(dev_priv->bridge_dev);
> +
> + intel_runtime_pm_put(dev_priv);
> +
Not sure if we should/can keep the runtime reference until this point.
At worst this could lead into the runtime_pm_put function poking at the
hardware registers after the pci_dev has been released.
Also if we change the hangcheck task to execute depending on the
runtime_pm count, this will surely cause trouble. Added Imre as CC to
comment on this.
> kfree(dev_priv);
>
> return 0;
Insert goto label around here and make it "return ret;".
Regards, Joonas
>
--
Joonas Lahtinen
Open Source Technology Center
Intel Corporation
_______________________________________________
Intel-gfx mailing list
Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
http://lists.freedesktop.org/mailman/listinfo/intel-gfx
