Allows to set up and use multiple MSI irqs per device.
Signed-off-by: Lucas Stach <l.stach@xxxxxxxxxxxxxx>
---
The ifdef is needed to avoid a compile error on
!CONFIG_PCI_MSI, as msi_list is only part of pci_dev
when the kernel is compiled with MSI support.
v2: move ifdeffery inside single function
---
drivers/pci/host/pcie-designware.c | 43 ++++++++++++++++++++++++++++++++++++++
1 file changed, 43 insertions(+)
diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c
index 69486be7181e..52c600327805 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:
@@ -323,6 +326,45 @@ 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 msi_msg msg;
+ 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->msi_list));
+ desc = list_entry(pdev->msi_list.next, struct msi_desc, list);
+
+ irq = assign_irq(nvec, desc, &pos);
+ if (irq < 0)
+ return irq;
+
+ if (pp->ops->get_msi_addr)
+ msg.address_lo = pp->ops->get_msi_addr(pp);
+ else
+ msg.address_lo = virt_to_phys((void *)pp->msi_data);
+ msg.address_hi = 0x0;
+
+ if (pp->ops->get_msi_data)
+ msg.data = pp->ops->get_msi_data(pp, pos);
+ else
+ msg.data = pos;
+
+ pci_write_msi_msg(irq, &msg);
+
+ return 0;
+#else
+ return -ENOSYS;
+#endif
+}
+
static void dw_msi_teardown_irq(struct msi_controller *chip, unsigned int irq)
{
struct irq_data *data = irq_get_irq_data(irq);
@@ -334,6 +376,7 @@ 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,
};
--
2.1.4
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