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PCI: endpoint: Add linkdown notifier support

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Add support to notify the EPF device about the linkdown event from the EPC
device.

Link: https://lore.kernel.org/r/20230602114756.36586-5-manivannan.sadhasivam@linaro.org
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Lorenzo Pieralisi <lpieralisi@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Kishon Vijay Abraham I <kishon@kernel.org>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
This commit is contained in:
Manivannan Sadhasivam
2023-06-02 17:17:51 +05:30
committed by Bjorn Helgaas
parent a504c96558
commit a1f6c3d7d3
3 changed files with 29 additions and 0 deletions
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26
drivers/pci/endpoint/pci-epc-core.c
View File

@@ -706,6 +706,32 @@ 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)
{
struct pci_epf *epf;
if (!epc || IS_ERR(epc))
return;
mutex_lock(&epc->list_lock);
list_for_each_entry(epf, &epc->pci_epf, list) {
mutex_lock(&epf->lock);
if (epf->event_ops && epf->event_ops->link_down)
epf->event_ops->link_down(epf);
mutex_unlock(&epf->lock);
}
mutex_unlock(&epc->list_lock);
}
EXPORT_SYMBOL_GPL(pci_epc_linkdown);
/**
* pci_epc_init_notify() - Notify the EPF device that EPC device's core
* initialization is completed.

1
include/linux/pci-epc.h
View File

@@ -203,6 +203,7 @@ 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);

2
include/linux/pci-epf.h
View File

@@ -71,10 +71,12 @@ struct pci_epf_ops {
* struct pci_epf_event_ops - Callbacks for capturing the EPC events
* @core_init: Callback for the EPC initialization complete event
* @link_up: Callback for the EPC link up event
* @link_down: Callback for the EPC link down event
*/
struct pci_epc_event_ops {
int (*core_init)(struct pci_epf *epf);
int (*link_up)(struct pci_epf *epf);
int (*link_down)(struct pci_epf *epf);
};
/**