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Commit 79707374 authored by Lucas Stach's avatar Lucas Stach Committed by Bjorn Helgaas
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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: default avatarLucas Stach <l.stach@pengutronix.de>
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
Acked-by: default avatarPratyush Anand <pratyush.anand@gmail.com>
parent ea643e1a

drivers/pci/host/pcie-designware.c

+31 −0
Original line number Diff line number Diff line
@@ -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,

};