diff options
| author | Lucas Stach <l.stach@pengutronix.de> | 2015-09-18 13:58:35 -0500 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2015-09-18 13:58:35 -0500 |
| commit | 79707374090411c5fa9dbcde862e59306bf8f765 (patch) | |
| tree | 27fa887d0045afa25b0e4d4ae6fb3f3d4936a923 | |
| parent | ea643e1a33576216de589cf525dbb40267fde5a9 (diff) | |
PCI: designware: Implement multivector MSI IRQ setup
Implement multivector MSI IRQ setup. This allows to set up and use multiple
MSI IRQs per device.
[bhelgaas: changelog, use -EINVAL instead of -ENOSYS]
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Pratyush Anand <pratyush.anand@gmail.com>
| -rw-r--r-- | drivers/pci/host/pcie-designware.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c index ea5b285baea6..66d789aefa0d 100644 --- a/drivers/pci/host/pcie-designware.c +++ b/drivers/pci/host/pcie-designware.c @@ -286,6 +286,9 @@ static int assign_irq(int no_irqs, struct msi_desc *desc, int *pos) } *pos = pos0; + desc->nvec_used = no_irqs; + desc->msi_attrib.multiple = order_base_2(no_irqs); + return irq; no_valid_irq: @@ -329,6 +332,33 @@ static int dw_msi_setup_irq(struct msi_controller *chip, struct pci_dev *pdev, return 0; } +static int dw_msi_setup_irqs(struct msi_controller *chip, struct pci_dev *pdev, + int nvec, int type) +{ +#ifdef CONFIG_PCI_MSI + int irq, pos; + struct msi_desc *desc; + struct pcie_port *pp = sys_to_pcie(pdev->bus->sysdata); + + /* MSI-X interrupts are not supported */ + if (type == PCI_CAP_ID_MSIX) + return -EINVAL; + + WARN_ON(!list_is_singular(&pdev->dev.msi_list)); + desc = list_entry(pdev->dev.msi_list.next, struct msi_desc, list); + + irq = assign_irq(nvec, desc, &pos); + if (irq < 0) + return irq; + + dw_msi_setup_msg(pp, irq, pos); + + return 0; +#else + return -EINVAL; +#endif +} + static void dw_msi_teardown_irq(struct msi_controller *chip, unsigned int irq) { struct irq_data *data = irq_get_irq_data(irq); @@ -340,6 +370,7 @@ static void dw_msi_teardown_irq(struct msi_controller *chip, unsigned int irq) static struct msi_controller dw_pcie_msi_chip = { .setup_irq = dw_msi_setup_irq, + .setup_irqs = dw_msi_setup_irqs, .teardown_irq = dw_msi_teardown_irq, }; |