diff options
| author | Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> | 2021-06-16 12:23:10 +0530 |
|---|---|---|
| committer | Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> | 2021-08-19 10:51:19 +0530 |
| commit | b6f2bc8361a5e448601066d4a2468cf49e6b6f11 (patch) | |
| tree | 597bfa2419a158ed4b6056263883424f1a3c721e | |
| parent | 7633bd000740e4778f85dd21fb16bf4bb8290d1b (diff) | |
PCI: endpoint: Add linkdown notifier support
Add support to notify the EPF device about the linkdown event from the
EPC device.
Usage:
======
EPC
---
```
static irqreturn_t pcie_ep_irq(int irq, void *data)
{
...
case PCIE_EP_INT_LINK_DOWN:
pci_epc_linkdown(epc);
break;
...
}
```
EPF
---
```
static int pci_epf_notifier(struct notifier_block *nb, unsigned long val,
void *data)
{
...
case LINK_DOWN:
/* Handle link down event */
break;
...
}
```
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
| -rw-r--r-- | drivers/pci/endpoint/pci-epc-core.c | 17 | ||||
| -rw-r--r-- | include/linux/pci-epc.h | 1 | ||||
| -rw-r--r-- | include/linux/pci-epf.h | 1 |
3 files changed, 19 insertions, 0 deletions
diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c index adec9bee72cf..f29d78c18438 100644 --- a/drivers/pci/endpoint/pci-epc-core.c +++ b/drivers/pci/endpoint/pci-epc-core.c @@ -642,6 +642,23 @@ void pci_epc_linkup(struct pci_epc *epc) EXPORT_SYMBOL_GPL(pci_epc_linkup); /** + * pci_epc_linkdown() - Notify the EPF device that EPC device has dropped the + * connection with the Root Complex. + * @epc: the EPC device which has dropped the link with the host + * + * Invoke to Notify the EPF device that the EPC device has dropped the + * connection with the Root Complex. + */ +void pci_epc_linkdown(struct pci_epc *epc) +{ + if (!epc || IS_ERR(epc)) + return; + + atomic_notifier_call_chain(&epc->notifier, LINK_DOWN, NULL); +} +EXPORT_SYMBOL_GPL(pci_epc_linkdown); + +/** * pci_epc_init_notify() - Notify the EPF device that EPC device's core * initialization is completed. * @epc: the EPC device whose core initialization is completeds diff --git a/include/linux/pci-epc.h b/include/linux/pci-epc.h index 50a649d33e68..9b4676363081 100644 --- a/include/linux/pci-epc.h +++ b/include/linux/pci-epc.h @@ -205,6 +205,7 @@ void pci_epc_destroy(struct pci_epc *epc); int pci_epc_add_epf(struct pci_epc *epc, struct pci_epf *epf, enum pci_epc_interface_type type); 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_remove_epf(struct pci_epc *epc, struct pci_epf *epf, enum pci_epc_interface_type type); diff --git a/include/linux/pci-epf.h b/include/linux/pci-epf.h index 2debc27ba95e..29d572e35063 100644 --- a/include/linux/pci-epf.h +++ b/include/linux/pci-epf.h @@ -20,6 +20,7 @@ enum pci_epc_interface_type; enum pci_notify_event { CORE_INIT, LINK_UP, + LINK_DOWN, }; enum pci_barno { |