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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>
This commit is contained in:
Lucas Stach 2015-09-18 13:58:35 -05:00 committed by Bjorn Helgaas
parent ea643e1a33
commit 7970737409
1 changed files with 31 additions and 0 deletions
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31
drivers/pci/host/pcie-designware.c
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@ -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,
};