| Message ID | 20210616115913.138778-2-manivannan.sadhasivam@linaro.org |
|---|---|
| State | New |
| Headers | show |
| Series | PCI: endpoint: Add support for additional notifiers | expand |
On 6/16/2021 5:29 PM, Manivannan Sadhasivam wrote: > External email: Use caution opening links or attachments > > > 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; Can you provide use case/scenario when epc will get LINK_DOWN interrupt? > ... > } > ``` > > 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> > --- > drivers/pci/endpoint/pci-epc-core.c | 17 +++++++++++++++++ > include/linux/pci-epc.h | 1 + > include/linux/pci-epf.h | 1 + > 3 files changed, 19 insertions(+) > > 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 > @@ -641,6 +641,23 @@ 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. > diff --git a/include/linux/pci-epc.h b/include/linux/pci-epc.h > index b82c9b100e97..23590efc13e7 100644 > --- a/include/linux/pci-epc.h > +++ b/include/linux/pci-epc.h > @@ -202,6 +202,7 @@ 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 6833e2160ef1..e9ad634b1575 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 { > -- > 2.25.1 >
On Wed, Jun 16, 2021 at 11:52:28PM +0530, Om Prakash Singh wrote: > > > On 6/16/2021 5:29 PM, Manivannan Sadhasivam wrote: > > External email: Use caution opening links or attachments > > > > > > 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; > Can you provide use case/scenario when epc will get LINK_DOWN interrupt? > During host shutdown/reboot epc will get LINK_DOWN interrupt. And in our MHI function we need to catch that for handling the SYSERR state as per the spec. Thanks, Mani > > ... > > } > > ``` > > > > 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> > > --- > > drivers/pci/endpoint/pci-epc-core.c | 17 +++++++++++++++++ > > include/linux/pci-epc.h | 1 + > > include/linux/pci-epf.h | 1 + > > 3 files changed, 19 insertions(+) > > > > 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 > > @@ -641,6 +641,23 @@ 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. > > diff --git a/include/linux/pci-epc.h b/include/linux/pci-epc.h > > index b82c9b100e97..23590efc13e7 100644 > > --- a/include/linux/pci-epc.h > > +++ b/include/linux/pci-epc.h > > @@ -202,6 +202,7 @@ 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 6833e2160ef1..e9ad634b1575 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 { > > -- > > 2.25.1 > >
====== 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> --- drivers/pci/endpoint/pci-epc-core.c | 17 +++++++++++++++++ include/linux/pci-epc.h | 1 + include/linux/pci-epf.h | 1 + 3 files changed, 19 insertions(+) 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 @@ -641,6 +641,23 @@ 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. diff --git a/include/linux/pci-epc.h b/include/linux/pci-epc.h index b82c9b100e97..23590efc13e7 100644 --- a/include/linux/pci-epc.h +++ b/include/linux/pci-epc.h @@ -202,6 +202,7 @@ 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 6833e2160ef1..e9ad634b1575 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 {