Add support to notify the EPF device about the Power Management Event
(PME) received by the EPC device from the Root complex.
Usage:
======
EPC
---
```
static irqreturn_t pcie_ep_irq(int irq, void *data)
{
...
case PCIE_EP_INT_PM_TURNOFF:
pci_epc_pme_notify(epc, PCIE_EP_PM_TURNOFF);
break;
...
}
```
EPF
---
```
static int pci_epf_notifier(struct notifier_block *nb, unsigned long val,
void *data)
{
...
case PME:
pm_state = data;
if (pm_state == PCIE_EP_PM_TURNOFF)
/* Handle PM Turnoff event */
break;
...
}
```
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>
---
drivers/pci/endpoint/pci-epc-core.c | 18 ++++++++++++++++++
include/linux/pci-epc.h | 1 +
include/linux/pci-epf.h | 1 +
3 files changed, 20 insertions(+)
diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c
index 7e42a83a4877..63fe90dbbba2 100644
--- a/drivers/pci/endpoint/pci-epc-core.c
+++ b/drivers/pci/endpoint/pci-epc-core.c
@@ -692,6 +692,24 @@ void pci_epc_bme_notify(struct pci_epc *epc)
}
EXPORT_SYMBOL_GPL(pci_epc_bme_notify);
+/**
+ * pci_epc_pme_notify() - Notify the EPF device that the EPC device has received
+ * the PME from the Root complex
+ * @epc: the EPC device that received the PME
+ * @data: Data for the PME notifier
+ *
+ * Invoke to Notify the EPF device that the EPC device has received the Power
+ * Management Event (PME) from the Root complex
+ */
+void pci_epc_pme_notify(struct pci_epc *epc, void *data)
+{
+ if (!epc || IS_ERR(epc))
+ return;
+
+ atomic_notifier_call_chain(&epc->notifier, PME, data);
+}
+EXPORT_SYMBOL_GPL(pci_epc_pme_notify);
+
/**
* pci_epc_destroy() - destroy the EPC device
* @epc: the EPC device that has to be destroyed
diff --git a/include/linux/pci-epc.h b/include/linux/pci-epc.h
index 6c2cff33f670..37dbcade1780 100644
--- a/include/linux/pci-epc.h
+++ b/include/linux/pci-epc.h
@@ -205,6 +205,7 @@ void pci_epc_linkup(struct pci_epc *epc);
void pci_epc_linkdown(struct pci_epc *epc);
void pci_epc_init_notify(struct pci_epc *epc);
void pci_epc_bme_notify(struct pci_epc *epc);
+void pci_epc_pme_notify(struct pci_epc *epc, void *data);
void pci_epc_remove_epf(struct pci_epc *epc, struct pci_epf *epf,
enum pci_epc_interface_type type);
int pci_epc_write_header(struct pci_epc *epc, u8 func_no,
diff --git a/include/linux/pci-epf.h b/include/linux/pci-epf.h
index 063a59a58e3c..c162a73eb836 100644
--- a/include/linux/pci-epf.h
+++ b/include/linux/pci-epf.h
@@ -22,6 +22,7 @@ enum pci_notify_event {
LINK_UP,
LINK_DOWN,
BME,
+ PME,
};
enum pci_barno {
--
2.25.1
