[PATCH 2/2] aer: add support aer interrupt with none MSI/MSI-X/INTx mode

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[PATCH 2/2] aer: add support aer interrupt with none MSI/MSI-X/INTx mode

Po Liu
On some platforms, root port doesn't support MSI/MSI-X/INTx in RC mode.
When chip support the aer interrupt with none MSI/MSI-X/INTx mode,
maybe there is interrupt line for aer pme etc. Search the interrupt
number in the fdt file.

Signed-off-by: Po Liu <[hidden email]>
---
 drivers/pci/pcie/portdrv_core.c | 31 ++++++++++++++++++++++++++++---
 1 file changed, 28 insertions(+), 3 deletions(-)

diff --git a/drivers/pci/pcie/portdrv_core.c b/drivers/pci/pcie/portdrv_core.c
index 32d4d0a..64833e5 100644
--- a/drivers/pci/pcie/portdrv_core.c
+++ b/drivers/pci/pcie/portdrv_core.c
@@ -15,6 +15,7 @@
 #include <linux/slab.h>
 #include <linux/pcieport_if.h>
 #include <linux/aer.h>
+#include <linux/of_irq.h>
 
 #include "../pci.h"
 #include "portdrv.h"
@@ -199,6 +200,28 @@ static int pcie_port_enable_msix(struct pci_dev *dev, int *vectors, int mask)
 static int init_service_irqs(struct pci_dev *dev, int *irqs, int mask)
 {
  int i, irq = -1;
+ int ret;
+ struct device_node *np = NULL;
+
+ for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++)
+ irqs[i] = 0;
+
+ if (dev->bus->dev.of_node)
+ np = dev->bus->dev.of_node;
+
+ /* If root port doesn't support MSI/MSI-X/INTx in RC mode,
+ * request irq for aer
+ */
+ if (IS_ENABLED(CONFIG_OF_IRQ) && np &&
+ (mask & PCIE_PORT_SERVICE_PME)) {
+ ret = of_irq_get_byname(np, "aer");
+ if (ret > 0) {
+ irqs[PCIE_PORT_SERVICE_AER_SHIFT] = ret;
+ if (dev->irq)
+ irq = dev->irq;
+ goto no_msi;
+ }
+ }
 
  /*
  * If MSI cannot be used for PCIe PME or hotplug, we have to use
@@ -224,11 +247,13 @@ static int init_service_irqs(struct pci_dev *dev, int *irqs, int mask)
  irq = dev->irq;
 
  no_msi:
- for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++)
- irqs[i] = irq;
+ for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++) {
+ if (!irqs[i])
+ irqs[i] = irq;
+ }
  irqs[PCIE_PORT_SERVICE_VC_SHIFT] = -1;
 
- if (irq < 0)
+ if (irq < 0 && irqs[PCIE_PORT_SERVICE_AER_SHIFT] < 0)
  return -ENODEV;
  return 0;
 }
--
2.1.0.27.g96db324