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From: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Date: Tue, 30 Apr 2024 11:43:44 +0530
Subject: [PATCH v4 03/10] PCI: endpoint: Rename BME to Bus Master Enable
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Message-Id: <20240430-pci-epf-rework-v4-3-22832d0d456f@linaro.org>
References: <20240430-pci-epf-rework-v4-0-22832d0d456f@linaro.org>
In-Reply-To: <20240430-pci-epf-rework-v4-0-22832d0d456f@linaro.org>
To: Lorenzo Pieralisi <lpieralisi@kernel.org>, 
 =?utf-8?q?Krzysztof_Wilczy=C5=84ski?= <kw@linux.com>, 
 Rob Herring <robh@kernel.org>, Bjorn Helgaas <bhelgaas@google.com>, 
 Kishon Vijay Abraham I <kishon@kernel.org>, 
 Jingoo Han <jingoohan1@gmail.com>, 
 Thierry Reding <thierry.reding@gmail.com>, 
 Jonathan Hunter <jonathanh@nvidia.com>
Cc: linux-pci@vger.kernel.org, linux-arm-msm@vger.kernel.org, 
 linux-kernel@vger.kernel.org, mhi@lists.linux.dev, 
 linux-tegra@vger.kernel.org, Niklas Cassel <cassel@kernel.org>, 
 Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>, 
 Damien Le Moal <dlemoal@kernel.org>

BME which stands for 'Bus Master Enable' is not defined in the PCIe base
spec even though it is commonly referred in many places (vendor docs). But
to align with the spec, let's rename it to its expansion 'Bus Master
Enable'.

Suggested-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Niklas Cassel <cassel@kernel.org>
Tested-by: Niklas Cassel <cassel@kernel.org>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
---
 drivers/pci/controller/dwc/pcie-qcom-ep.c    |  4 ++--
 drivers/pci/endpoint/functions/pci-epf-mhi.c |  8 ++++----
 drivers/pci/endpoint/pci-epc-core.c          | 19 ++++++++++---------
 include/linux/pci-epc.h                      |  2 +-
 include/linux/pci-epf.h                      |  4 ++--
 5 files changed, 19 insertions(+), 18 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-qcom-ep.c b/drivers/pci/controller/dwc/pcie-qcom-ep.c
index 50b1635e3cbb..f6e925d434f6 100644
--- a/drivers/pci/controller/dwc/pcie-qcom-ep.c
+++ b/drivers/pci/controller/dwc/pcie-qcom-ep.c
@@ -636,10 +636,10 @@ static irqreturn_t qcom_pcie_ep_global_irq_thread(int irq, void *data)
 		pcie_ep->link_status = QCOM_PCIE_EP_LINK_DOWN;
 		pci_epc_linkdown(pci->ep.epc);
 	} else if (FIELD_GET(PARF_INT_ALL_BME, status)) {
-		dev_dbg(dev, "Received BME event. Link is enabled!\n");
+		dev_dbg(dev, "Received Bus Master Enable event. Link is enabled!\n");
 		pcie_ep->link_status = QCOM_PCIE_EP_LINK_ENABLED;
 		qcom_pcie_ep_icc_update(pcie_ep);
-		pci_epc_bme_notify(pci->ep.epc);
+		pci_epc_bus_master_enable_notify(pci->ep.epc);
 	} else if (FIELD_GET(PARF_INT_ALL_PM_TURNOFF, status)) {
 		dev_dbg(dev, "Received PM Turn-off event! Entering L23\n");
 		val = readl_relaxed(pcie_ep->parf + PARF_PM_CTRL);
diff --git a/drivers/pci/endpoint/functions/pci-epf-mhi.c b/drivers/pci/endpoint/functions/pci-epf-mhi.c
index 95c3206f609f..b662905e2532 100644
--- a/drivers/pci/endpoint/functions/pci-epf-mhi.c
+++ b/drivers/pci/endpoint/functions/pci-epf-mhi.c
@@ -819,7 +819,7 @@ static int pci_epf_mhi_link_down(struct pci_epf *epf)
 	return 0;
 }
 
-static int pci_epf_mhi_bme(struct pci_epf *epf)
+static int pci_epf_mhi_bus_master_enable(struct pci_epf *epf)
 {
 	struct pci_epf_mhi *epf_mhi = epf_get_drvdata(epf);
 	const struct pci_epf_mhi_ep_info *info = epf_mhi->info;
@@ -882,8 +882,8 @@ static void pci_epf_mhi_unbind(struct pci_epf *epf)
 
 	/*
 	 * Forcefully power down the MHI EP stack. Only way to bring the MHI EP
-	 * stack back to working state after successive bind is by getting BME
-	 * from host.
+	 * stack back to working state after successive bind is by getting Bus
+	 * Master Enable event from host.
 	 */
 	if (mhi_cntrl->mhi_dev) {
 		mhi_ep_power_down(mhi_cntrl);
@@ -900,7 +900,7 @@ static const struct pci_epc_event_ops pci_epf_mhi_event_ops = {
 	.epc_init = pci_epf_mhi_epc_init,
 	.link_up = pci_epf_mhi_link_up,
 	.link_down = pci_epf_mhi_link_down,
-	.bme = pci_epf_mhi_bme,
+	.bus_master_enable = pci_epf_mhi_bus_master_enable,
 };
 
 static int pci_epf_mhi_probe(struct pci_epf *epf,
diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c
index e6bffa37a948..56b60330355d 100644
--- a/drivers/pci/endpoint/pci-epc-core.c
+++ b/drivers/pci/endpoint/pci-epc-core.c
@@ -775,14 +775,15 @@ void pci_epc_notify_pending_init(struct pci_epc *epc, struct pci_epf *epf)
 EXPORT_SYMBOL_GPL(pci_epc_notify_pending_init);
 
 /**
- * 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
+ * pci_epc_bus_master_enable_notify() - Notify the EPF device that the EPC
+ *					device has received the Bus Master
+ *					Enable event from the Root complex
+ * @epc: the EPC device that received the Bus Master Enable event
  *
- * Invoke to Notify the EPF device that the EPC device has received the Bus
- * Master Enable (BME) event from the Root complex
+ * Notify the EPF device that the EPC device has generated the Bus Master Enable
+ * event due to host setting the Bus Master Enable bit in the Command register.
  */
-void pci_epc_bme_notify(struct pci_epc *epc)
+void pci_epc_bus_master_enable_notify(struct pci_epc *epc)
 {
 	struct pci_epf *epf;
 
@@ -792,13 +793,13 @@ void pci_epc_bme_notify(struct pci_epc *epc)
 	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);
+		if (epf->event_ops && epf->event_ops->bus_master_enable)
+			epf->event_ops->bus_master_enable(epf);
 		mutex_unlock(&epf->lock);
 	}
 	mutex_unlock(&epc->list_lock);
 }
-EXPORT_SYMBOL_GPL(pci_epc_bme_notify);
+EXPORT_SYMBOL_GPL(pci_epc_bus_master_enable_notify);
 
 /**
  * pci_epc_destroy() - destroy the EPC device
diff --git a/include/linux/pci-epc.h b/include/linux/pci-epc.h
index acc5f96161fe..11115cd0fe5b 100644
--- a/include/linux/pci-epc.h
+++ b/include/linux/pci-epc.h
@@ -226,7 +226,7 @@ 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_notify_pending_init(struct pci_epc *epc, struct pci_epf *epf);
-void pci_epc_bme_notify(struct pci_epc *epc);
+void pci_epc_bus_master_enable_notify(struct pci_epc *epc);
 void pci_epc_remove_epf(struct pci_epc *epc, struct pci_epf *epf,
 			enum pci_epc_interface_type type);
 int pci_epc_write_header(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
diff --git a/include/linux/pci-epf.h b/include/linux/pci-epf.h
index afe3bfd88742..dc759eb7157c 100644
--- a/include/linux/pci-epf.h
+++ b/include/linux/pci-epf.h
@@ -73,13 +73,13 @@ struct pci_epf_ops {
  * @epc_init: Callback for the EPC initialization complete event
  * @link_up: Callback for the EPC link up event
  * @link_down: Callback for the EPC link down event
- * @bme: Callback for the EPC BME (Bus Master Enable) event
+ * @bus_master_enable: Callback for the EPC Bus Master Enable event
  */
 struct pci_epc_event_ops {
 	int (*epc_init)(struct pci_epf *epf);
 	int (*link_up)(struct pci_epf *epf);
 	int (*link_down)(struct pci_epf *epf);
-	int (*bme)(struct pci_epf *epf);
+	int (*bus_master_enable)(struct pci_epf *epf);
 };
 
 /**

-- 
2.25.1