On Wed, Jun 14, 2023 at 08:30:47PM +0530, Krishna chaitanya chundru wrote:
> Endpoint cannot send any data/MSI when the device state is in
> D3cold or D3hot. Endpoint needs to bring the device back to D0
> to send any kind of data.
>
> For this endpoint can send inband PME the device is in D3hot or
> toggle wake when the device is D3 cold.
>
Are you referring to "host" as the "device"? If so, then it is a wrong
terminology.
> To support this adding wake up host to epc core.
>
Commit message should be imperative.
> Signed-off-by: Krishna chaitanya chundru <quic_krichai@xxxxxxxxxxx>
> ---
> drivers/pci/endpoint/pci-epc-core.c | 29 +++++++++++++++++++++++++++++
> include/linux/pci-epc.h | 3 +++
> 2 files changed, 32 insertions(+)
>
> diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c
> index 46c9a5c..d203947 100644
> --- a/drivers/pci/endpoint/pci-epc-core.c
> +++ b/drivers/pci/endpoint/pci-epc-core.c
> @@ -167,6 +167,35 @@ const struct pci_epc_features *pci_epc_get_features(struct pci_epc *epc,
> EXPORT_SYMBOL_GPL(pci_epc_get_features);
>
> /**
> + * pci_epc_wakeup_host() - interrupt the host system
s/interrupt the host system/Wakeup the host
> + * @epc: the EPC device which has to interrupt the host
s/interrupt/wake
> + * @func_no: the physical endpoint function number in the EPC device
> + * @vfunc_no: the virtual endpoint function number in the physical function
> + *
> + * Invoke to wakeup host
> + */
> +int pci_epc_wakeup_host(struct pci_epc *epc, u8 func_no, u8 vfunc_no)
> +{
> + int ret;
> +
> + if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions)
> + return -EINVAL;
> +
> + if (vfunc_no > 0 && (!epc->max_vfs || vfunc_no > epc->max_vfs[func_no]))
> + return -EINVAL;
> +
Use proper errno for both of the above.
- Mani
> + if (!epc->ops->wakeup_host)
> + return 0;
> +
> + mutex_lock(&epc->lock);
> + ret = epc->ops->wakeup_host(epc, func_no, vfunc_no);
> + mutex_unlock(&epc->lock);
> +
> + return ret;
> +}
> +EXPORT_SYMBOL_GPL(pci_epc_wakeup_host);
> +
> +/**
> * pci_epc_stop() - stop the PCI link
> * @epc: the link of the EPC device that has to be stopped
> *
> diff --git a/include/linux/pci-epc.h b/include/linux/pci-epc.h
> index 301bb0e..a8496be 100644
> --- a/include/linux/pci-epc.h
> +++ b/include/linux/pci-epc.h
> @@ -59,6 +59,7 @@ pci_epc_interface_string(enum pci_epc_interface_type type)
> * @start: ops to start the PCI link
> * @stop: ops to stop the PCI link
> * @get_features: ops to get the features supported by the EPC
> + * @wakeup_host: ops to wakeup the host
> * @owner: the module owner containing the ops
> */
> struct pci_epc_ops {
> @@ -88,6 +89,7 @@ struct pci_epc_ops {
> void (*stop)(struct pci_epc *epc);
> const struct pci_epc_features* (*get_features)(struct pci_epc *epc,
> u8 func_no, u8 vfunc_no);
> + int (*wakeup_host)(struct pci_epc *epc, u8 func_no, u8 vfunc_no);
> struct module *owner;
> };
>
> @@ -232,6 +234,7 @@ int pci_epc_start(struct pci_epc *epc);
> void pci_epc_stop(struct pci_epc *epc);
> const struct pci_epc_features *pci_epc_get_features(struct pci_epc *epc,
> u8 func_no, u8 vfunc_no);
> +int pci_epc_wakeup_host(struct pci_epc *epc, u8 func_no, u8 vfunc_no);
> enum pci_barno
> pci_epc_get_first_free_bar(const struct pci_epc_features *epc_features);
> enum pci_barno pci_epc_get_next_free_bar(const struct pci_epc_features
> --
> 2.7.4
>
--
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