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authorSean V Kelley <sean.v.kelley@intel.com>2020-11-21 03:10:35 +0300
committerBjorn Helgaas <bhelgaas@google.com>2020-12-06 00:26:02 +0300
commit9a2f604f44979e0effa8cf067e5a8ecda729f23b (patch)
treef16d5d5336df79199ea0355723877e2bbc2206e6 /drivers/pci/pcie
parentaf113553d9610b2d811d05da96263b4f666f44f0 (diff)
downloadlinux-9a2f604f44979e0effa8cf067e5a8ecda729f23b.tar.xz
PCI/PME: Add pcie_walk_rcec() to RCEC PME handling
Root Complex Event Collectors (RCEC) appear as peers of Root Ports and also have the PME capability. As with AER, there is a need to be able to walk the RCiEPs associated with their RCEC for purposes of acting upon them with callbacks. Add RCEC support through the use of pcie_walk_rcec() to the current PME service driver and attach the PME service driver to the RCEC device. Co-developed-by: Qiuxu Zhuo <qiuxu.zhuo@intel.com> Link: https://lore.kernel.org/r/20201121001036.8560-15-sean.v.kelley@intel.com Tested-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> # non-native/no RCEC Signed-off-by: Qiuxu Zhuo <qiuxu.zhuo@intel.com> Signed-off-by: Sean V Kelley <sean.v.kelley@intel.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'drivers/pci/pcie')
-rw-r--r--drivers/pci/pcie/pme.c16
-rw-r--r--drivers/pci/pcie/portdrv_core.c9
2 files changed, 15 insertions, 10 deletions
diff --git a/drivers/pci/pcie/pme.c b/drivers/pci/pcie/pme.c
index 6a32970bb731..3fc08488d65f 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 +323,16 @@ 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 type = pci_pcie_type(port);
int ret;
+ /* Limit to Root Ports or Root Complex Event Collectors */
+ if (type != PCI_EXP_TYPE_RC_EC &&
+ type != PCI_EXP_TYPE_ROOT_PORT)
+ return -ENODEV;
+
data = kzalloc(sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
@@ -333,7 +342,6 @@ 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 +453,7 @@ 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,
diff --git a/drivers/pci/pcie/portdrv_core.c b/drivers/pci/pcie/portdrv_core.c
index 50a9522ab07d..e1fed6649c41 100644
--- a/drivers/pci/pcie/portdrv_core.c
+++ b/drivers/pci/pcie/portdrv_core.c
@@ -233,12 +233,9 @@ static int get_port_device_capability(struct pci_dev *dev)
}
#endif
- /*
- * Root ports are capable of generating PME too. Root Complex
- * Event Collectors can also generate PMEs, but we don't handle
- * those yet.
- */
- if (pci_pcie_type(dev) == PCI_EXP_TYPE_ROOT_PORT &&
+ /* Root Ports and Root Complex Event Collectors may generate PMEs */
+ if ((pci_pcie_type(dev) == PCI_EXP_TYPE_ROOT_PORT ||
+ pci_pcie_type(dev) == PCI_EXP_TYPE_RC_EC) &&
(pcie_ports_native || host->native_pme)) {
services |= PCIE_PORT_SERVICE_PME;