linux-kernel - [PATCH 3/4] PCI/portdrv: Check platform supported service IRQ's

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Date:   Fri, 10 Aug 2018 21:09:39 +0530
From:   Bharat Kumar Gogada <bharat.kumar.gogada@...inx.com>
To:     <linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <bhelgaas@...gle.com>, <rgummal@...inx.com>,
        Bharat Kumar Gogada <bharat.kumar.gogada@...inx.com>
Subject: [PATCH 3/4] PCI/portdrv: Check platform supported service IRQ's

Platforms may have dedicated IRQ lines for PCIe services like
AER/PME etc., check for such IRQ lines.
Check mask and fill legacy irq line for services other than
platform supported service IRQ number.

Signed-off-by: Bharat Kumar Gogada <bharat.kumar.gogada@...inx.com>
---
 drivers/pci/pcie/portdrv_core.c |   19 +++++++++++++++++--
 1 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/pcie/portdrv_core.c b/drivers/pci/pcie/portdrv_core.c
index e0261ad..a7d024c 100644
--- a/drivers/pci/pcie/portdrv_core.c
+++ b/drivers/pci/pcie/portdrv_core.c
@@ -166,6 +166,19 @@ static int pcie_init_service_irqs(struct pci_dev *dev, int *irqs, int mask)
 		irqs[i] = -1;
 
 	/*
+	 * Some platforms have dedicated interrupt line from root complex to
+	 * interrupt controller for PCIe services like AER/PME etc., check
+	 * if platform registered with any such IRQ.
+	 */
+	if (pci_pcie_type(dev) == PCI_EXP_TYPE_ROOT_PORT) {
+		int plat_mask;
+
+		plat_mask = pci_check_platform_service_irqs(dev, irqs, mask);
+		if (plat_mask > 0)
+			mask = mask & plat_mask;
+	}
+
+	/*
 	 * If we support PME but can't use MSI/MSI-X for it, we have to
 	 * fall back to INTx or other interrupts, e.g., a system shared
 	 * interrupt.
@@ -183,8 +196,10 @@ static int pcie_init_service_irqs(struct pci_dev *dev, int *irqs, int mask)
 	if (ret < 0)
 		return -ENODEV;
 
-	for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++)
-		irqs[i] = pci_irq_vector(dev, 0);
+	for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++) {
+		if (mask & (1 << i))
+			irqs[i] = pci_irq_vector(dev, 0);
+	}
 
 	return 0;
 }
-- 
1.7.1