linux-kernel - Re: [PATCH v2 1/4] i915: make inject_virtual

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Date:   Thu, 23 Nov 2023 08:24:24 +0800
From:   Zhenyu Wang <zhenyuw@...ux.intel.com>
To:     Christian Brauner <brauner@...nel.org>
Cc:     linux-fsdevel@...r.kernel.org, Christoph Hellwig <hch@....de>,
        Jan Kara <jack@...e.cz>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        David Woodhouse <dwmw2@...radead.org>,
        Paul Durrant <paul@....org>, Oded Gabbay <ogabbay@...nel.org>,
        Wu Hao <hao.wu@...el.com>, Tom Rix <trix@...hat.com>,
        Moritz Fischer <mdf@...nel.org>, Xu Yilun <yilun.xu@...el.com>,
        Zhenyu Wang <zhenyuw@...ux.intel.com>,
        Zhi Wang <zhi.a.wang@...el.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
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        Daniel Vetter <daniel@...ll.ch>,
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        Jason Wang <jasowang@...hat.com>,
        Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
        Diana Craciun <diana.craciun@....nxp.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Eric Auger <eric.auger@...hat.com>, Fei Li <fei1.li@...el.com>,
        Benjamin LaHaise <bcrl@...ck.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
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        Shakeel Butt <shakeelb@...gle.com>,
        Muchun Song <muchun.song@...ux.dev>,
        Kirti Wankhede <kwankhede@...dia.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-fpga@...r.kernel.org, intel-gvt-dev@...ts.freedesktop.org,
        intel-gfx@...ts.freedesktop.org, linux-rdma@...r.kernel.org,
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Subject: Re: [PATCH v2 1/4] i915: make inject_virtual_interrupt() void

On 2023.11.22 13:48:22 +0100, Christian Brauner wrote:
> The single caller of inject_virtual_interrupt() ignores the return value
> anyway. This allows us to simplify eventfd_signal() in follow-up
> patches.
> 
> Signed-off-by: Christian Brauner <brauner@...nel.org>
> ---
>  drivers/gpu/drm/i915/gvt/interrupt.c | 14 +++++++-------
>  1 file changed, 7 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/gvt/interrupt.c b/drivers/gpu/drm/i915/gvt/interrupt.c
> index de3f5903d1a7..9665876b4b13 100644
> --- a/drivers/gpu/drm/i915/gvt/interrupt.c
> +++ b/drivers/gpu/drm/i915/gvt/interrupt.c
> @@ -422,7 +422,7 @@ static void init_irq_map(struct intel_gvt_irq *irq)
>  #define MSI_CAP_DATA(offset) (offset + 8)
>  #define MSI_CAP_EN 0x1
>  
> -static int inject_virtual_interrupt(struct intel_vgpu *vgpu)
> +static void inject_virtual_interrupt(struct intel_vgpu *vgpu)
>  {
>  	unsigned long offset = vgpu->gvt->device_info.msi_cap_offset;
>  	u16 control, data;
> @@ -434,10 +434,10 @@ static int inject_virtual_interrupt(struct intel_vgpu *vgpu)
>  
>  	/* Do not generate MSI if MSIEN is disabled */
>  	if (!(control & MSI_CAP_EN))
> -		return 0;
> +		return;
>  
>  	if (WARN(control & GENMASK(15, 1), "only support one MSI format\n"))
> -		return -EINVAL;
> +		return;
>  
>  	trace_inject_msi(vgpu->id, addr, data);
>  
> @@ -451,10 +451,10 @@ static int inject_virtual_interrupt(struct intel_vgpu *vgpu)
>  	 * returned and don't inject interrupt into guest.
>  	 */
>  	if (!test_bit(INTEL_VGPU_STATUS_ATTACHED, vgpu->status))
> -		return -ESRCH;
> -	if (vgpu->msi_trigger && eventfd_signal(vgpu->msi_trigger, 1) != 1)
> -		return -EFAULT;
> -	return 0;
> +		return;
> +	if (!vgpu->msi_trigger)
> +		return;
> +	eventfd_signal(vgpu->msi_trigger, 1);
>  }

I think it's a little simpler to write as
    if (vgpu->msi_trigger)
            eventfd_signal(vgpu->msi_trigger, 1);

Looks fine with me.

Reviewed-by: Zhenyu Wang <zhenyuw@...ux.intel.com>

Thanks!

>  
>  static void propagate_event(struct intel_gvt_irq *irq,
> 
> -- 
> 2.42.0
> 

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