From: Alex Deucher Date: Thu, 3 Oct 2019 15:34:30 +0000 (-0500) Subject: drm/amdgpu: improve MSI-X handling (v3) X-Git-Tag: v5.5-rc1~128^2~26^2~28 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=8a745c7ff2ddb8511ef760b4d9cb4cf56a15fc8d;p=linux.git drm/amdgpu: improve MSI-X handling (v3) Check the number of supported vectors and fall back to MSI if we return or error or 0 MSI-X vectors. v2: only allocate one vector. We can't currently use more than one anyway. v3: install the irq on vector 0. Tested-by: Tom St Denis Reviewed-by: Shaoyun liu Signed-off-by: Alex Deucher --- diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c index 50771b2757dc..6f3b03f6224f 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c @@ -245,11 +245,19 @@ int amdgpu_irq_init(struct amdgpu_device *adev) adev->irq.msi_enabled = false; if (amdgpu_msi_ok(adev)) { - int nvec = pci_alloc_irq_vectors(adev->pdev, 1, pci_msix_vec_count(adev->pdev), - PCI_IRQ_MSI | PCI_IRQ_MSIX); + 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) { adev->irq.msi_enabled = true; - dev_dbg(adev->dev, "amdgpu: using MSI.\n"); + dev_dbg(adev->dev, "amdgpu: using MSI/MSI-X.\n"); } } @@ -272,7 +280,8 @@ int amdgpu_irq_init(struct amdgpu_device *adev) INIT_WORK(&adev->irq.ih2_work, amdgpu_irq_handle_ih2); adev->irq.installed = true; - r = drm_irq_install(adev->ddev, adev->ddev->pdev->irq); + /* Use vector 0 for MSI-X */ + r = drm_irq_install(adev->ddev, pci_irq_vector(adev->pdev, 0)); if (r) { adev->irq.installed = false; if (!amdgpu_device_has_dc_support(adev))