Add support for notifying the EPF device about the custom notifications
received by the EPC device from the Root complex. These notifications
are EPC/vendor specific and are shared with the specific EPF devices.
For instance, the Qcom EPC device generates events such as MHI_A7,
MHI_Q6, DEBUG, MMIO_WRITE, CFG_WRITE etc... These events can be passed
to the EPF device using this notifier.
EPC
---
```
static irqreturn_t pcie_ep_irq(int irq, void *data)
{
...
case PCIE_EP_INT_MHI_A7:
pci_epc_custom_notify(epc, PCIE_EP_INT_MHI_A7);
break;
case PCIE_EP_INT_MHI_Q6:
pci_epc_custom_notify(epc, PCIE_EP_INT_MHI_Q6);
break;
case PCIE_EP_INT_MMIO_WRITE:
pci_epc_custom_notify(epc, PCIE_EP_INT_MMIO_WRITE);
break;
...
}
```
EPF
---
```
static int pci_epf_notifier(struct notifier_block *nb, unsigned long val,
void *data)
{
...
case CUSTOM:
cus_event = data;
if (cus_event == PCIE_EP_INT_MHI_A7)
/* Handle MHI A7 event */
else if (cus_event == PCIE_EP_INT_MHI_Q6)
/* Handle MHI Q6 event */
else if (cus_event == PCIE_EP_INT_MMIO_WRITE)
/* Handle MMIO WRITE event */
break;
...
}
```
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>
---
drivers/pci/endpoint/pci-epc-core.c | 19 +++++++++++++++++++
include/linux/pci-epc.h | 1 +
include/linux/pci-epf.h | 1 +
3 files changed, 21 insertions(+)
diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c
index b4a7bb3caa97..b963a4aa0af4 100644
--- a/drivers/pci/endpoint/pci-epc-core.c
+++ b/drivers/pci/endpoint/pci-epc-core.c
@@ -728,6 +728,25 @@ void pci_epc_d_state_notify(struct pci_epc *epc, void *data)
}
EXPORT_SYMBOL_GPL(pci_epc_d_state_notify);
+/**
+ * pci_epc_custom_notify() - Notify the EPF device that the EPC device has
+ * received the custom events from the Root complex
+ * @epc: EPC device that received the custom event
+ * @data: Data for the CUSTOM notifier
+ *
+ * Invoke to notify the EPF device that the EPC device has received the Custom
+ * event from the Root complex. The custom event is EPC/vendor specific and is
+ * shared with the EPF device.
+ */
+void pci_epc_custom_notify(struct pci_epc *epc, void *data)
+{
+ if (!epc || IS_ERR(epc))
+ return;
+
+ atomic_notifier_call_chain(&epc->notifier, CUSTOM, data);
+}
+EXPORT_SYMBOL_GPL(pci_epc_custom_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 94c66fae8a88..943d31a83f6e 100644
--- a/include/linux/pci-epc.h
+++ b/include/linux/pci-epc.h
@@ -207,6 +207,7 @@ 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_d_state_notify(struct pci_epc *epc, void *data);
+void pci_epc_custom_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 ca020c080431..2fa3b90399b9 100644
--- a/include/linux/pci-epf.h
+++ b/include/linux/pci-epf.h
@@ -24,6 +24,7 @@ enum pci_notify_event {
BME,
PME,
D_STATE,
+ CUSTOM,
};
enum pci_barno {
--
2.25.1
