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PCI: endpoint: Add BME notifier support

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Add support to notify the EPF device about the Bus Master Enable (BME)
event received by the EPC device from the Root complex.

Link: https://lore.kernel.org/r/20230602114756.36586-6-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 17:17:52 +05:30 committed by Bjorn Helgaas
parent a1f6c3d7d3
commit 6360efb96b
3 changed files with 29 additions and 0 deletions
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26
drivers/pci/endpoint/pci-epc-core.c
View file

@ -758,6 +758,32 @@ void pci_epc_init_notify(struct pci_epc *epc)
}
EXPORT_SYMBOL_GPL(pci_epc_init_notify);
/**
* pci_epc_bme_notify() - Notify the EPF device that the EPC device has received
* the BME event from the Root complex
* @epc: the EPC device that received the BME event
*
* Invoke to Notify the EPF device that the EPC device has received the Bus
* Master Enable (BME) event from the Root complex
*/
void pci_epc_bme_notify(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->bme)
epf->event_ops->bme(epf);
mutex_unlock(&epf->lock);
}
mutex_unlock(&epc->list_lock);
}
EXPORT_SYMBOL_GPL(pci_epc_bme_notify);
/**
* pci_epc_destroy() - destroy the EPC device
* @epc: the EPC device that has to be destroyed

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

@ -205,6 +205,7 @@ int pci_epc_add_epf(struct pci_epc *epc, struct pci_epf *epf,
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_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, u8 vfunc_no,

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

@ -72,11 +72,13 @@ struct pci_epf_ops {
* @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
* @bme: Callback for the EPC BME (Bus Master Enable) 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);
int (*bme)(struct pci_epf *epf);
};
/**