linux-kernel - [RFC PATCH 8/9] PCI/PME: Add RCEC PME handling

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Date:   Fri, 24 Jul 2020 10:22:22 -0700
From:   Sean V Kelley <sean.v.kelley@...el.com>
To:     bhelgaas@...gle.com, Jonathan.Cameron@...wei.com,
        rjw@...ysocki.net, ashok.raj@...nel.org, tony.luck@...el.com,
        sathyanarayanan.kuppuswamy@...ux.intel.com
Cc:     linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        Sean V Kelley <sean.v.kelley@...el.com>,
        Qiuxu Zhuo <qiuxu.zhuo@...el.com>
Subject: [RFC PATCH 8/9] PCI/PME: Add RCEC PME handling

The Root Complex Event Collectors(RCEC) appear as peers of Root Ports
and also have the PME capability. So add RCEC support to the current PME
service driver and attach the PME service driver to the RCEC device.

Co-developed-by: Qiuxu Zhuo <qiuxu.zhuo@...el.com>
Signed-off-by: Sean V Kelley <sean.v.kelley@...el.com>
Signed-off-by: Qiuxu Zhuo <qiuxu.zhuo@...el.com>
---
 drivers/pci/pcie/pme.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/drivers/pci/pcie/pme.c b/drivers/pci/pcie/pme.c
index 6a32970bb731..87799166c96a 100644
--- a/drivers/pci/pcie/pme.c
+++ b/drivers/pci/pcie/pme.c
@@ -310,7 +310,10 @@ static int pcie_pme_can_wakeup(struct pci_dev *dev, void *ign)
 static void pcie_pme_mark_devices(struct pci_dev *port)
 {
 	pcie_pme_can_wakeup(port, NULL);
-	if (port->subordinate)
+
+	if (pci_pcie_type(port) == PCI_EXP_TYPE_RC_EC)
+		pcie_walk_rcec(port, pcie_pme_can_wakeup, NULL);
+	else if (port->subordinate)
 		pci_walk_bus(port->subordinate, pcie_pme_can_wakeup, NULL);
 }
 
@@ -320,10 +323,15 @@ static void pcie_pme_mark_devices(struct pci_dev *port)
  */
 static int pcie_pme_probe(struct pcie_device *srv)
 {
-	struct pci_dev *port;
+	struct pci_dev *port = srv->port;
 	struct pcie_pme_service_data *data;
 	int ret;
 
+	/* Limit to Root Ports or Root Complex Event Collectors */
+	if ((pci_pcie_type(port) != PCI_EXP_TYPE_RC_EC) &&
+	    (pci_pcie_type(port) != PCI_EXP_TYPE_ROOT_PORT))
+		return -ENODEV;
+
 	data = kzalloc(sizeof(*data), GFP_KERNEL);
 	if (!data)
 		return -ENOMEM;
@@ -333,7 +341,6 @@ static int pcie_pme_probe(struct pcie_device *srv)
 	data->srv = srv;
 	set_service_data(srv, data);
 
-	port = srv->port;
 	pcie_pme_interrupt_enable(port, false);
 	pcie_clear_root_pme_status(port);
 
@@ -445,7 +452,7 @@ static void pcie_pme_remove(struct pcie_device *srv)
 
 static struct pcie_port_service_driver pcie_pme_driver = {
 	.name		= "pcie_pme",
-	.port_type	= PCI_EXP_TYPE_ROOT_PORT,
+	.port_type	= PCIE_ANY_PORT,
 	.service	= PCIE_PORT_SERVICE_PME,
 
 	.probe		= pcie_pme_probe,
-- 
2.27.0