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drm/amdgpu: improve MSI-X handling (v3)

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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 <tom.stdenis@amd.com>
Reviewed-by: Shaoyun liu  <shaoyun.liu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Deucher 2019-10-03 10:34:30 -05:00
parent d4411d793e
commit 8a745c7ff2
1 changed files with 13 additions and 4 deletions
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17
drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
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@ -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))