1. 14 Aug, 2018 1 commit
    • Hang Yuan's avatar
      drm/i915/gvt: fix cleanup sequence in intel_gvt_clean_device · 3fd34ac0
      Hang Yuan authored
      Create one vGPU and then unbind IGD device from i915 driver. The following
      oops will happen. This patch will free vgpu resource first and then gvt
      resource to remove these oops.
      
      BUG: unable to handle kernel NULL pointer dereference at       00000000000000a8
        PGD 80000003c9d2c067 P4D 80000003c9d2c067 PUD 3c817c067 P      MD 0
        Oops: 0002 [#1] SMP PTI
        RIP: 0010:down_write+0x1b/0x40
      Call Trace:
        debugfs_remove_recursive+0x46/0x1a0
        intel_gvt_debugfs_remove_vgpu+0x15/0x30 [i915]
        intel_gvt_destroy_vgpu+0x2d/0xf0 [i915]
        intel_vgpu_remove+0x2c/0x30 [kvmgt]
        mdev_device_remove_ops+0x23/0x50 [mdev]
        mdev_device_remove+0xdb/0x190 [mdev]
        mdev_device_remove+0x190/0x190 [mdev]
        device_for_each_child+0x47/0x90
        mdev_unregister_device+0xd5/0x120 [mdev]
        intel_gvt_clean_device+0x91/0x120 [i915]
        i915_driver_unload+0x9d/0x120 [i915]
        i915_pci_remove+0x15/0x20 [i915]
        pci_device_remove+0x3b/0xc0
        device_release_driver_internal+0x157/0x230
        unbind_store+0xfc/0x150
        kernfs_fop_write+0x10f/0x180
        __vfs_write+0x36/0x180
        ? common_file_perm+0x41/0x130
        ? _cond_resched+0x16/0x40
        vfs_write+0xb3/0x1a0
        ksys_write+0x52/0xc0
        do_syscall_64+0x55/0x100
        entry_SYSCALL_64_after_hwframe+0x44/0xa9
      
      BUG: unable to handle kernel NULL pointer dereference at 0      000000000000038
        PGD 8000000405bce067 P4D 8000000405bce067 PUD 405bcd067 PM      D 0
        Oops: 0000 [#1] SMP PTI
        RIP: 0010:hrtimer_active+0x5/0x40
      Call Trace:
        hrtimer_try_to_cancel+0x25/0x120
        ? tbs_sched_clean_vgpu+0x1f/0x50 [i915]
        hrtimer_cancel+0x15/0x20
        intel_gvt_destroy_vgpu+0x4c/0xf0 [i915]
        intel_vgpu_remove+0x2c/0x30 [kvmgt]
        mdev_device_remove_ops+0x23/0x50 [mdev]
        mdev_device_remove+0xdb/0x190 [mdev]
        ? mdev_device_remove+0x190/0x190 [mdev]
        device_for_each_child+0x47/0x90
        mdev_unregister_device+0xd5/0x120 [mdev]
        intel_gvt_clean_device+0x89/0x120 [i915]
        i915_driver_unload+0x9d/0x120 [i915]
        i915_pci_remove+0x15/0x20 [i915]
        pci_device_remove+0x3b/0xc0
        device_release_driver_internal+0x157/0x230
        unbind_store+0xfc/0x150
        kernfs_fop_write+0x10f/0x180
        __vfs_write+0x36/0x180
        ? common_file_perm+0x41/0x130
        ? _cond_resched+0x16/0x40
        vfs_write+0xb3/0x1a0
        ksys_write+0x52/0xc0
        do_syscall_64+0x55/0x100
        entry_SYSCALL_64_after_hwframe+0x44/0xa9
      
      Fixes: bc7b0be3("drm/i915/gvt: Add basic debugfs infrastructure")
      Fixes: afe04fbe("drm/i915/gvt: create an idle vGPU")
      Signed-off-by: default avatarHang Yuan <hang.yuan@linux.intel.com>
      Signed-off-by: default avatarZhenyu Wang <zhenyuw@linux.intel.com>
      3fd34ac0
  2. 13 Aug, 2018 1 commit
  3. 07 Aug, 2018 1 commit
  4. 06 Aug, 2018 5 commits
  5. 31 Jul, 2018 2 commits
  6. 30 Jul, 2018 30 commits