linux-kernel - [PATCH] drm/amdgpu: Simplify IRQ vector request logic

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Date:   Tue, 16 Jun 2020 10:42:41 +0200
From:   Piotr Stankiewicz <piotr.stankiewicz@...el.com>
To:     Alex Deucher <alexander.deucher@....com>
Cc:     Piotr Stankiewicz <piotr.stankiewicz@...el.com>,
        Christian König <christian.koenig@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Hawking Zhang <Hawking.Zhang@....com>,
        Lyude Paul <lyude@...hat.com>, shaoyunl <shaoyun.liu@....com>,
        Emily Deng <Emily.Deng@....com>,
        Aurabindo Pillai <mail@...abindo.in>,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] drm/amdgpu: Simplify IRQ vector request logic

pci_alloc_irq_vectors() will handle fallback from MSI-X to MSI
internally, if necessary. So remove checks which determine if we are
dealing with MSI or MSI-X and rely on pci_alloc_irq_vectors() to do the
right thing.

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 | 11 +----------
 1 file changed, 1 insertion(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
index 0cc4c67f95f7..2d68ad7d45d4 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
@@ -248,17 +248,8 @@ int amdgpu_irq_init(struct amdgpu_device *adev)
 	adev->irq.msi_enabled = false;
 
 	if (amdgpu_msi_ok(adev)) {
-		int nvec = pci_msix_vec_count(adev->pdev);
-		unsigned int flags;
-
-		if (nvec <= 0) {
-			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);
-		if (nvec > 0) {
+		if (pci_alloc_irq_vectors(adev->pdev, 1, 1, PCI_IRQ_MSI | PCI_IRQ_MSIX) > 0) {
 			adev->irq.msi_enabled = true;
 			dev_dbg(adev->dev, "using MSI/MSI-X.\n");
 		}
-- 
2.17.2