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authorManivannan Sadhasivam <manivannan.sadhasivam@linaro.org>2023-06-02 14:47:52 +0300
committerBjorn Helgaas <bhelgaas@google.com>2023-06-23 23:05:28 +0300
commit6360efb96b19d89990b2a5bf3a73c689a429f5da (patch)
tree41239fd2544dfc99c325f528c03c21dcfc7d1dca /drivers/pci
parenta1f6c3d7d3a2fdcb7bf77da17a17944c81ca13de (diff)
downloadlinux-6360efb96b19d89990b2a5bf3a73c689a429f5da.tar.xz
PCI: endpoint: Add BME notifier support
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>
Diffstat (limited to 'drivers/pci')
-rw-r--r--drivers/pci/endpoint/pci-epc-core.c26
1 files changed, 26 insertions, 0 deletions
diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c
index e0570b52698d..6c54fa5684d2 100644
--- a/drivers/pci/endpoint/pci-epc-core.c
+++ b/drivers/pci/endpoint/pci-epc-core.c
@@ -759,6 +759,32 @@ 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
*