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@xxxxxxxxxxx>
---
Documentation/PCI/endpoint/pci-endpoint.rst | 3 +++
drivers/pci/endpoint/pci-epc-core.c | 24 ++++++++++++++++++++++++
include/linux/pci-epc.h | 2 ++
include/linux/pci-epf.h | 2 ++
4 files changed, 31 insertions(+)
diff --git a/Documentation/PCI/endpoint/pci-endpoint.rst b/Documentation/PCI/endpoint/pci-endpoint.rst
index 21507e3cc238..3eb5648ca7ec 100644
--- a/Documentation/PCI/endpoint/pci-endpoint.rst
+++ b/Documentation/PCI/endpoint/pci-endpoint.rst
@@ -77,6 +77,9 @@ by the PCI controller driver.
Cleanup the pci_epc_mem structure allocated during pci_epc_mem_init().
+* pci_epc_dstate_notify()
+
+ 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 84309dfe0c68..e2b9c458f2c4 100644
--- a/drivers/pci/endpoint/pci-epc-core.c
+++ b/drivers/pci/endpoint/pci-epc-core.c
@@ -828,6 +828,30 @@ void pci_epc_bus_master_enable_notify(struct pci_epc *epc)
}
EXPORT_SYMBOL_GPL(pci_epc_bus_master_enable_notify);
+/**
+ * pci_epc_dstate_notify() - Notify the EPF driver 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 D-state has
+ * changed.
+ */
+void pci_epc_dstate_notify(struct pci_epc *epc, pci_power_t state)
+{
+ struct pci_epf *epf;
+
+ 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_notify);
+
/**
* 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 85bdf2adb760..e473d1780928 100644
--- a/include/linux/pci-epc.h
+++ b/include/linux/pci-epc.h
@@ -276,6 +276,8 @@ void __iomem *pci_epc_mem_alloc_addr(struct pci_epc *epc,
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_notify(struct pci_epc *epc, pci_power_t state);
+
#else
static inline void pci_epc_init_notify(struct pci_epc *epc)
{
diff --git a/include/linux/pci-epf.h b/include/linux/pci-epf.h
index 18a3aeb62ae4..d88063cdb067 100644
--- a/include/linux/pci-epf.h
+++ b/include/linux/pci-epf.h
@@ -75,6 +75,7 @@ struct pci_epf_ops {
* @link_up: Callback for the EPC link up event
* @link_down: Callback for the EPC link down event
* @bus_master_enable: Callback for the EPC Bus Master Enable event
+ * @dstate_notify: Callback for the EPC D-state change event
*/
struct pci_epc_event_ops {
int (*epc_init)(struct pci_epf *epf);
@@ -82,6 +83,7 @@ struct pci_epc_event_ops {
int (*link_up)(struct pci_epf *epf);
int (*link_down)(struct pci_epf *epf);
int (*bus_master_enable)(struct pci_epf *epf);
+ int (*dstate_notify)(struct pci_epf *epf, pci_power_t state);
};
/**
--
2.42.0
