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author | Bjorn Helgaas <bhelgaas@google.com> | 2020-12-15 15:11:13 -0600 |
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committer | Bjorn Helgaas <bhelgaas@google.com> | 2020-12-15 15:11:13 -0600 |
commit | f7ce6838763f4be68a1432789674b04e87470cf9 (patch) | |
tree | a83856bb25f1a3e54910789aa974783406372acf /drivers/pci | |
parent | b9efb854e9fd3eff0671484e328bd24e2118d11c (diff) | |
parent | f6b7bb847ca821a8aaa1b6da10ee65311e6f15bf (diff) | |
download | linux-f7ce6838763f4be68a1432789674b04e87470cf9.tar.gz linux-f7ce6838763f4be68a1432789674b04e87470cf9.tar.bz2 linux-f7ce6838763f4be68a1432789674b04e87470cf9.zip |
Merge branch 'remotes/lorenzo/pci/vmd'
- Offset client VMD MSI-X vectors (Jon Derrick)
* remotes/lorenzo/pci/vmd:
PCI: vmd: Offset Client VMD MSI-X vectors
Diffstat (limited to 'drivers/pci')
-rw-r--r-- | drivers/pci/controller/vmd.c | 37 |
1 files changed, 26 insertions, 11 deletions
diff --git a/drivers/pci/controller/vmd.c b/drivers/pci/controller/vmd.c index 59fa9a94860f..4e23e80bacaa 100644 --- a/drivers/pci/controller/vmd.c +++ b/drivers/pci/controller/vmd.c @@ -54,6 +54,12 @@ enum vmd_features { * vendor-specific capability space */ VMD_FEAT_HAS_MEMBAR_SHADOW_VSCAP = (1 << 2), + + /* + * Device may use MSI-X vector 0 for software triggering and will not + * be used for MSI remapping + */ + VMD_FEAT_OFFSET_FIRST_VECTOR = (1 << 3), }; /* @@ -105,6 +111,7 @@ struct vmd_dev { struct irq_domain *irq_domain; struct pci_bus *bus; u8 busn_start; + u8 first_vec; }; static inline struct vmd_dev *vmd_from_bus(struct pci_bus *bus) @@ -200,11 +207,11 @@ static irq_hw_number_t vmd_get_hwirq(struct msi_domain_info *info, */ static struct vmd_irq_list *vmd_next_irq(struct vmd_dev *vmd, struct msi_desc *desc) { - int i, best = 1; unsigned long flags; + int i, best; - if (vmd->msix_count == 1) - return &vmd->irqs[0]; + if (vmd->msix_count == 1 + vmd->first_vec) + return &vmd->irqs[vmd->first_vec]; /* * White list for fast-interrupt handlers. All others will share the @@ -214,11 +221,12 @@ static struct vmd_irq_list *vmd_next_irq(struct vmd_dev *vmd, struct msi_desc *d case PCI_CLASS_STORAGE_EXPRESS: break; default: - return &vmd->irqs[0]; + return &vmd->irqs[vmd->first_vec]; } raw_spin_lock_irqsave(&list_lock, flags); - for (i = 1; i < vmd->msix_count; i++) + best = vmd->first_vec + 1; + for (i = best; i < vmd->msix_count; i++) if (vmd->irqs[i].count < vmd->irqs[best].count) best = i; vmd->irqs[best].count++; @@ -549,8 +557,8 @@ static int vmd_alloc_irqs(struct vmd_dev *vmd) if (vmd->msix_count < 0) return -ENODEV; - vmd->msix_count = pci_alloc_irq_vectors(dev, 1, vmd->msix_count, - PCI_IRQ_MSIX); + vmd->msix_count = pci_alloc_irq_vectors(dev, vmd->first_vec + 1, + vmd->msix_count, PCI_IRQ_MSIX); if (vmd->msix_count < 0) return vmd->msix_count; @@ -718,6 +726,7 @@ static int vmd_enable_domain(struct vmd_dev *vmd, unsigned long features) static int vmd_probe(struct pci_dev *dev, const struct pci_device_id *id) { + unsigned long features = (unsigned long) id->driver_data; struct vmd_dev *vmd; int err; @@ -742,13 +751,16 @@ static int vmd_probe(struct pci_dev *dev, const struct pci_device_id *id) dma_set_mask_and_coherent(&dev->dev, DMA_BIT_MASK(32))) return -ENODEV; + if (features & VMD_FEAT_OFFSET_FIRST_VECTOR) + vmd->first_vec = 1; + err = vmd_alloc_irqs(vmd); if (err) return err; spin_lock_init(&vmd->cfg_lock); pci_set_drvdata(dev, vmd); - err = vmd_enable_domain(vmd, (unsigned long) id->driver_data); + err = vmd_enable_domain(vmd, features); if (err) return err; @@ -817,13 +829,16 @@ static const struct pci_device_id vmd_ids[] = { VMD_FEAT_HAS_BUS_RESTRICTIONS,}, {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x467f), .driver_data = VMD_FEAT_HAS_MEMBAR_SHADOW_VSCAP | - VMD_FEAT_HAS_BUS_RESTRICTIONS,}, + VMD_FEAT_HAS_BUS_RESTRICTIONS | + VMD_FEAT_OFFSET_FIRST_VECTOR,}, {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x4c3d), .driver_data = VMD_FEAT_HAS_MEMBAR_SHADOW_VSCAP | - VMD_FEAT_HAS_BUS_RESTRICTIONS,}, + VMD_FEAT_HAS_BUS_RESTRICTIONS | + VMD_FEAT_OFFSET_FIRST_VECTOR,}, {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_VMD_9A0B), .driver_data = VMD_FEAT_HAS_MEMBAR_SHADOW_VSCAP | - VMD_FEAT_HAS_BUS_RESTRICTIONS,}, + VMD_FEAT_HAS_BUS_RESTRICTIONS | + VMD_FEAT_OFFSET_FIRST_VECTOR,}, {0,} }; MODULE_DEVICE_TABLE(pci, vmd_ids); |