[v4,1/9] PCI: endpoint: Add D-state change notifier support
Commit Message
Add support to notify the EPF device about the D-state change event
from the EPC device.
Signed-off-by: Krishna chaitanya chundru <quic_krichai@quicinc.com>
---
Documentation/PCI/endpoint/pci-endpoint.rst | 5 +++++
drivers/pci/endpoint/pci-epc-core.c | 27 +++++++++++++++++++++++++++
include/linux/pci-epc.h | 1 +
include/linux/pci-epf.h | 1 +
4 files changed, 34 insertions(+)
Comments
On Thu, Jul 13, 2023 at 12:40:10PM +0530, Krishna chaitanya chundru wrote:
> Add support to notify the EPF device about the D-state change event
> from the EPC device.
>
> Signed-off-by: Krishna chaitanya chundru <quic_krichai@quicinc.com>
> ---
> Documentation/PCI/endpoint/pci-endpoint.rst | 5 +++++
> drivers/pci/endpoint/pci-epc-core.c | 27 +++++++++++++++++++++++++++
> include/linux/pci-epc.h | 1 +
> include/linux/pci-epf.h | 1 +
> 4 files changed, 34 insertions(+)
>
> diff --git a/Documentation/PCI/endpoint/pci-endpoint.rst b/Documentation/PCI/endpoint/pci-endpoint.rst
> index 4f5622a..3a54713 100644
> --- a/Documentation/PCI/endpoint/pci-endpoint.rst
> +++ b/Documentation/PCI/endpoint/pci-endpoint.rst
> @@ -78,6 +78,11 @@ by the PCI controller driver.
> Cleanup the pci_epc_mem structure allocated during pci_epc_mem_init().
>
>
> +* pci_epc_dstate_notity()
> +
> + In order to notify all the function devices that the EPC device has
> + changed its D-state.
Notify all the function drivers that the EPC device has changed its D-state.
> +
> EPC APIs for the PCI Endpoint Function Driver
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
> diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c
> index 6c54fa5..ea76baf 100644
> --- a/drivers/pci/endpoint/pci-epc-core.c
> +++ b/drivers/pci/endpoint/pci-epc-core.c
> @@ -785,6 +785,33 @@ void pci_epc_bme_notify(struct pci_epc *epc)
> EXPORT_SYMBOL_GPL(pci_epc_bme_notify);
>
> /**
> + * pci_epc_dstate_notity() - Notify the EPF device that EPC device D-state
EPF driver
- Mani
> + * has changed
> + * @epc: the EPC device which has change in D-state
> + * @state: the changed D-state
> + *
> + * Invoke to Notify the EPF device that the EPC device has D-state has
> + * changed.
> + */
> +void pci_epc_dstate_notity(struct pci_epc *epc, pci_power_t state)
> +{
> + 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->dstate_notify)
> + epf->event_ops->dstate_notify(epf, state);
> + mutex_unlock(&epf->lock);
> + }
> + mutex_unlock(&epc->list_lock);
> +}
> +EXPORT_SYMBOL_GPL(pci_epc_dstate_notity);
> +
> +/**
> * pci_epc_destroy() - destroy the EPC device
> * @epc: the EPC device that has to be destroyed
> *
> diff --git a/include/linux/pci-epc.h b/include/linux/pci-epc.h
> index 5cb6940..26a1108 100644
> --- a/include/linux/pci-epc.h
> +++ b/include/linux/pci-epc.h
> @@ -251,4 +251,5 @@ void __iomem *pci_epc_mem_alloc_addr(struct pci_epc *epc,
> phys_addr_t *phys_addr, size_t size);
> void pci_epc_mem_free_addr(struct pci_epc *epc, phys_addr_t phys_addr,
> void __iomem *virt_addr, size_t size);
> +void pci_epc_dstate_change(struct pci_epc *epc, pci_power_t state);
> #endif /* __LINUX_PCI_EPC_H */
> diff --git a/include/linux/pci-epf.h b/include/linux/pci-epf.h
> index 3f44b6a..529075b 100644
> --- a/include/linux/pci-epf.h
> +++ b/include/linux/pci-epf.h
> @@ -79,6 +79,7 @@ struct pci_epc_event_ops {
> int (*link_up)(struct pci_epf *epf);
> int (*link_down)(struct pci_epf *epf);
> int (*bme)(struct pci_epf *epf);
> + int (*dstate_notify)(struct pci_epf *epf, pci_power_t state);
> };
>
> /**
> --
> 2.7.4
>
@@ -78,6 +78,11 @@ by the PCI controller driver.
Cleanup the pci_epc_mem structure allocated during pci_epc_mem_init().
+* pci_epc_dstate_notity()
+
+ In order to notify all the function devices that the EPC device has
+ changed its D-state.
+
EPC APIs for the PCI Endpoint Function Driver
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -785,6 +785,33 @@ void pci_epc_bme_notify(struct pci_epc *epc)
EXPORT_SYMBOL_GPL(pci_epc_bme_notify);
/**
+ * pci_epc_dstate_notity() - Notify the EPF device that EPC device D-state
+ * has changed
+ * @epc: the EPC device which has change in D-state
+ * @state: the changed D-state
+ *
+ * Invoke to Notify the EPF device that the EPC device has D-state has
+ * changed.
+ */
+void pci_epc_dstate_notity(struct pci_epc *epc, pci_power_t state)
+{
+ 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->dstate_notify)
+ epf->event_ops->dstate_notify(epf, state);
+ mutex_unlock(&epf->lock);
+ }
+ mutex_unlock(&epc->list_lock);
+}
+EXPORT_SYMBOL_GPL(pci_epc_dstate_notity);
+
+/**
* pci_epc_destroy() - destroy the EPC device
* @epc: the EPC device that has to be destroyed
*
@@ -251,4 +251,5 @@ void __iomem *pci_epc_mem_alloc_addr(struct pci_epc *epc,
phys_addr_t *phys_addr, size_t size);
void pci_epc_mem_free_addr(struct pci_epc *epc, phys_addr_t phys_addr,
void __iomem *virt_addr, size_t size);
+void pci_epc_dstate_change(struct pci_epc *epc, pci_power_t state);
#endif /* __LINUX_PCI_EPC_H */
@@ -79,6 +79,7 @@ struct pci_epc_event_ops {
int (*link_up)(struct pci_epf *epf);
int (*link_down)(struct pci_epf *epf);
int (*bme)(struct pci_epf *epf);
+ int (*dstate_notify)(struct pci_epf *epf, pci_power_t state);
};
/**