linux-kernel - Re: [PATCH 07/15] drm/amdgpu: use PCI_IRQ_MSI

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Message-ID: <CAHp75Ve9tdNB7s+gybsg-OUjA3HiZBgzxeOzw=qkx8t1Ybbmsg@mail.gmail.com>
Date:   Tue, 2 Jun 2020 12:49:20 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Piotr Stankiewicz <piotr.stankiewicz@...el.com>
Cc:     Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        David Zhou <David1.Zhou@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, amd-gfx@...ts.freedesktop.org,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 07/15] drm/amdgpu: use PCI_IRQ_MSI_TYPES where appropriate

On Tue, Jun 2, 2020 at 12:24 PM Piotr Stankiewicz
<piotr.stankiewicz@...el.com> wrote:
>
> Seeing as there is shorthand available to use when asking for any type
> of interrupt, or any type of message signalled interrupt, leverage it.
>
> Signed-off-by: Piotr Stankiewicz <piotr.stankiewicz@...el.com>
> Reviewed-by: Andy Shevchenko <andriy.shevchenko@...el.com>
> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
> index 5ed4227f304b..6dbe173a9fd4 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
> @@ -251,11 +251,11 @@ int amdgpu_irq_init(struct amdgpu_device *adev)
>                 int nvec = pci_msix_vec_count(adev->pdev);
>                 unsigned int flags;
>
> -               if (nvec <= 0) {
> +               if (nvec > 0)
> +                       flags = PCI_IRQ_MSI_TYPES;
> +               else
>                         flags = PCI_IRQ_MSI;
> -               } else {
> -                       flags = PCI_IRQ_MSI | PCI_IRQ_MSIX;
> -               }
> +
>                 /* we only need one vector */
>                 nvec = pci_alloc_irq_vectors(adev->pdev, 1, 1, flags);

I'm not sure if you have seen my last comment internally about this patch.

I don't understand why we need these pci_msix_vec_count() followed by
conditional at all.
Perhaps we may simple drop all these and supply flag directly?

But OTOH, I don't know the initial motivation, so, the above patch is
non-intrusive and keeps original logic.

>                 if (nvec > 0) {
> --
> 2.17.2
>


-- 
With Best Regards,
Andy Shevchenko