linux-kernel - RE: [PATCH 07/15] drm/amdgpu: use PCI_IRQ_MSI_TYPES where appropriate

Open Source and information security mailing list archives

Message-ID: <14063C7AD467DE4B82DEDB5C278E8663010E23E538@FMSMSX108.amr.corp.intel.com>
Date:   Tue, 2 Jun 2020 13:35:20 +0000
From:   "Ruhl, Michael J" <michael.j.ruhl@...el.com>
To:     "Stankiewicz, Piotr" <piotr.stankiewicz@...el.com>,
        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>
CC:     "Stankiewicz, Piotr" <piotr.stankiewicz@...el.com>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "amd-gfx@...ts.freedesktop.org" <amd-gfx@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 07/15] drm/amdgpu: use PCI_IRQ_MSI_TYPES where
 appropriate

>-----Original Message-----
>From: dri-devel <dri-devel-bounces@...ts.freedesktop.org> On Behalf Of
>Piotr Stankiewicz
>Sent: Tuesday, June 2, 2020 5:21 AM
>To: 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>
>Cc: Stankiewicz, Piotr <piotr.stankiewicz@...el.com>; dri-
>devel@...ts.freedesktop.org; amd-gfx@...ts.freedesktop.org; linux-
>kernel@...r.kernel.org
>Subject: [PATCH 07/15] drm/amdgpu: use PCI_IRQ_MSI_TYPES where
>appropriate
>
>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;
>-		}

Minor nit:

Is it really necessary to set do this check?  Can flags just
be set?

I.e.: 
	flags = PCI_IRQ_MSI_TYPES;

pci_alloc_irq_vector() tries stuff in order.  If MSIX is not available,
it will try MSI.

M

>+
> 		/* we only need one vector */
> 		nvec = pci_alloc_irq_vectors(adev->pdev, 1, 1, flags);
> 		if (nvec > 0) {
>--
>2.17.2
>
>_______________________________________________
>dri-devel mailing list
>dri-devel@...ts.freedesktop.org
>https://lists.freedesktop.org/mailman/listinfo/dri-devel

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives