[PATCH] drm/i915/gvt: Enable gvt debugfs with mmio comparison on all vGPUs.

[Zhenyu Wang]

On 2018.06.04 16:47:20 +0800, Colin Xu wrote:
> Current mmio_diff_handler can only compare 1 active vGPU with host.
> 
> The patch will extend the mmio comparison debugfs capability to all
> active vGPUs, selected by vGPU mask bits.
>   - Add mmio_compare_vgpu_mask to enable vGPU selection.
>     - Bit 0: select all active vGPU.
>     - Bit i: select vGPU id i.
>   - Add mmio_compare to show comparison result.
>   - Retive mmio_diff since it's functionality is inherited and enhanced.
> 
> The new headline of the comparision results is:
> +---+--------+----+--------+--------+-----+
> | * | Offset | HW | vGPU i | vGPU j | ... |
> +---+--------+----+--------+--------+-----+
> 
> The leading star of each line indicate diff between preg and vreg(s).
> When only 1 vGPU is selected, per-bits-diff will append to each line.
> 
> Sample output:
> 
> - 1 vGPU, debugfs_vgpu_mask is 0x1 or 0x2:
> * Offset   HW       vGPU   1 Diff-Bits
>   0000003c 00000000 00000000
> * 00002030 00000ad8 00000000 3-4,6-7,9,11
> 
> - 3 vGPUs, debugfs_vgpu_mask is 0x1:
> * Offset   HW       vGPU   1 vGPU   2 vGPU   3
>   0000003c 00000000 00000000 00000000 00000000
> * 00002074 002012d0 0000cce8 00000000 00013b20
> 
> - 3 vGPUs, debugfs_vgpu_mask is 0xa:
> * Offset   HW       vGPU   1 vGPU   3
>   0000003c 00000000 00000000 00000000
> * 00002074 0000be30 0000d040 00013b20
>

Current mmio_diff is per-vgpu so you already have all info. So you
can use current mmio_diff to compare between vGPUs if you want. I
don't see a must to change this for kernel interface.

-- 
Open Source Technology Center, Intel ltd.

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