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PCI: vmd: Offset Client VMD MSI-X vectors

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Client VMD platforms have a software-triggered MSI-X vector 0 that will
not forward hardware-remapped MSI from the sub-device domain. This
causes an issue with VMD platforms that use AHCI behind VMD and have a
single MSI-X vector remapped to VMD vector 0. Add a VMD MSI-X vector
offset for these platforms.

Link: https://lore.kernel.org/r/20201102222223.92978-1-jonathan.derrick@intel.com
Tested-by: Jian-Hong Pan <jhp@endlessos.org>
Signed-off-by: Jon Derrick <jonathan.derrick@intel.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
This commit is contained in:
Jon Derrick 2020-11-02 15:22:23 -07:00 committed by Lorenzo Pieralisi
parent f8394f232b
commit f6b7bb847c
1 changed files with 26 additions and 11 deletions
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37
drivers/pci/controller/vmd.c
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@ -53,6 +53,12 @@ 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),
};
/*
@ -104,6 +110,7 @@ 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)
@ -199,11 +206,11 @@ 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
@ -213,11 +220,12 @@ 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++;
@ -550,8 +558,8 @@ 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;
@ -719,6 +727,7 @@ 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;
@ -743,13 +752,16 @@ 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;
@ -818,13 +830,16 @@ 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);