[PATCH] drm/i915/gvt: enabled pipe A default on creating vgpu

[Zhenyu Wang]

On 2017.11.16 16:54:23 +0800, Xiaolin Zhang wrote:
> when i915 driver unloading, it will shutdown all CRTCs and
> it will introudce kernel panic when conducting igt drv_module_reload
> test case under guest environment (bug reported by XENGT-468) as below:
> 
> BUG: unable to handle kernel NULL pointer dereference at 0000000000000070
> IP: intel_edp_backlight_off+0xe/0x7c [i915]
> RIP: 0010:intel_edp_backlight_off+0xe/0x7c [i915]
> Call Trace:
>  intel_disable_ddi+0xb3/0xbc [i915]
>  intel_modeset_setup_hw_state+0x654/0xb4c [i915]
>  intel_modeset_init+0x9f1/0xe69 [i915]
>  ? intel_i2c_reset+0x3d/0x40 [i915]
>  ? intel_setup_gmbus+0xba/0x249 [i915]
>  i915_driver_load+0xae5/0xcc0 [i915]
>  i915_pci_probe+0x3a/0x3c [i915]
>  local_pci_probe+0x38/0x7b
>  pci_device_probe+0xec/0x12b
>  driver_probe_device+0x134/0x294
>  __driver_attach+0x6a/0x8c
>  ? driver_probe_device+0x294/0x294
>  bus_for_each_dev+0x68/0x80
>  driver_attach+0x19/0x1b
>  bus_add_driver+0xea/0x1d3
>  ? 0xffffffffa03cd000
>  driver_register+0x85/0xc1
>  ? 0xffffffffa03cd000
>  __pci_register_driver+0x55/0x57
>  i915_init+0x57/0x5a [i915]
>  do_one_initcall+0x8a/0x12e
>  ? __vunmap+0x8d/0x93
>  ? kmem_cache_alloc_trace+0x96/0x11c
>  do_init_module+0x5a/0x1e1
> 
> in this case, active connector detected but no active pipe
> available, so it will hang to disable connector.
> 
> to fix, on vgpu creating, to report active pipe available for
> guest.
> 
> Signed-off-by: Xiaolin Zhang <xiaolin.zhang at intel.com>
> ---

applied, thanks!

-- 
Open Source Technology Center, Intel ltd.

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