linux-kernel - Re: [PATCH 1/2] drm/i915/gvt: add ACPI and 64BIT dependencies

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Message-ID: <20161022050600.ygqzljyvvqwykknv@zhen-hp.sh.intel.com>
Date:   Sat, 22 Oct 2016 13:06:00 +0800
From:   Zhenyu Wang <zhenyuw@...ux.intel.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Daniel Vetter <daniel.vetter@...el.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Zhi Wang <zhi.a.wang@...el.com>,
        Zhenyu Wang <zhenyuw@...ux.intel.com>,
        David Airlie <airlied@...ux.ie>,
        Chris Wilson <chris@...is-wilson.co.uk>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...el.com>,
        Andreas Ziegler <andreas.ziegler@....de>,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] drm/i915/gvt: add ACPI and 64BIT dependencies

On 2016.10.21 17:25:49 +0200, Arnd Bergmann wrote:
> The newly added gvt code produces lots of serious warnings and errors
> when either built on 32-bit x86, or built with ACPI disabled, e.g.
> 
> drivers/gpu/drm/i915/gvt/gtt.c: In function ???read_pte64???:
> drivers/gpu/drm/i915/gvt/gtt.c:277:2: error: left shift count >= width of type [-Werror]
> drivers/gpu/drm/i915/gvt/gtt.c: In function ???gen8_gtt_get_pfn???:
> drivers/gpu/drm/i915/gvt/gtt.c:360:3: error: left shift count >= width of type [-Werror]
> drivers/gpu/drm/i915/gvt/opregion.c: In function ???intel_gvt_init_opregion???:
> drivers/gpu/drm/i915/gvt/opregion.c:183:2: error: implicit declaration of function ???acpi_os_ioremap??? [-Werror=implicit-function-declaration]
> 
> This avoids the problems by simply disallowing those configurations
> in Kconfig. I'm sure it's possible to make the code more portable
> and support building GVT without those options, but it might not be
> useful to do so.
> 
> Fixes: 4d60c5fd3f87 ("drm/i915/gvt: vGPU PCI configuration space virtualization")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
> If the code is meant to work on 32-bit and non-ACPI kernels, please
> treat this as a bug report and disregard the patch.
> ---

Thanks, Arnd. We have to depend on 64bit now and not require for ACPI,
as we used one acpi function for opregion mem map which is not necessary,
so I queued one 64bit dependence and another to remove acpi dependence for Daniel.

>  drivers/gpu/drm/i915/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/gpu/drm/i915/Kconfig b/drivers/gpu/drm/i915/Kconfig
> index 6d4194288d11..1b9308284dde 100644
> --- a/drivers/gpu/drm/i915/Kconfig
> +++ b/drivers/gpu/drm/i915/Kconfig
> @@ -84,6 +84,7 @@ config DRM_I915_USERPTR
>  config DRM_I915_GVT
>          bool "Enable Intel GVT-g graphics virtualization host support"
>          depends on DRM_I915
> +	depends on 64BIT && ACPI
>          default n
>          help
>  	  Choose this option if you want to enable Intel GVT-g graphics
> -- 
> 2.9.0
> 

-- 
Open Source Technology Center, Intel ltd.

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