From 07c930b3d209c6dadf3bb62157764387d3fe1ba5 Mon Sep 17 00:00:00 2001
From: Lin Bai <lbai@codeaurora.org>
Date: Wed, 31 Mar 2021 12:22:28 +0800
Subject: [PATCH] cnss2: Add CNSS_BUS_EVENT to report bus info

CNSS_BUS_EVENT type added to report bus related info to
CLD driver.
Currently only PCIe's link down event taken care.

Change-Id: Ia18ce1b9ca8d0641e62271d645f1c87461029a26
Signed-off-by: Lin Bai <lbai@codeaurora.org>
---
 drivers/net/wireless/cnss2/pci.c | 17 +++++++++++++++++
 include/net/cnss2.h              | 12 ++++++++++++
 2 files changed, 29 insertions(+)

diff --git a/drivers/net/wireless/cnss2/pci.c b/drivers/net/wireless/cnss2/pci.c
index 1f483b3a0a54..766bde02b6fa 100644
--- a/drivers/net/wireless/cnss2/pci.c
+++ b/drivers/net/wireless/cnss2/pci.c
@@ -1222,6 +1222,17 @@ void cnss_pci_allow_l1(struct device *dev)
 }
 EXPORT_SYMBOL(cnss_pci_allow_l1);
 
+static void cnss_pci_update_link_event(struct cnss_pci_data *pci_priv,
+				       enum cnss_bus_event_type type,
+				       void *data)
+{
+	struct cnss_bus_event bus_event;
+
+	bus_event.etype = type;
+	bus_event.event_data = data;
+	cnss_pci_call_driver_uevent(pci_priv, CNSS_BUS_EVENT, &bus_event);
+}
+
 static void cnss_pci_handle_linkdown(struct cnss_pci_data *pci_priv)
 {
 	struct cnss_plat_data *plat_priv = pci_priv->plat_priv;
@@ -1244,6 +1255,12 @@ static void cnss_pci_handle_linkdown(struct cnss_pci_data *pci_priv)
 	if (pci_dev->device == QCA6174_DEVICE_ID)
 		disable_irq(pci_dev->irq);
 
+	/* Notify bus related event. Now for all supported chips.
+	 * Here PCIe LINK_DOWN notification taken care.
+	 * uevent buffer can be extended later, to cover more bus info.
+	 */
+	cnss_pci_update_link_event(pci_priv, BUS_EVENT_PCI_LINK_DOWN, NULL);
+
 	cnss_fatal_err("PCI link down, schedule recovery\n");
 	cnss_schedule_recovery(&pci_dev->dev, CNSS_REASON_LINK_DOWN);
 }
diff --git a/include/net/cnss2.h b/include/net/cnss2.h
index 72a88998d1d1..cbcfac90f960 100644
--- a/include/net/cnss2.h
+++ b/include/net/cnss2.h
@@ -82,6 +82,13 @@ enum cnss_driver_status {
 	CNSS_RECOVERY,
 	CNSS_FW_DOWN,
 	CNSS_HANG_EVENT,
+	CNSS_BUS_EVENT,
+};
+
+enum cnss_bus_event_type {
+	BUS_EVENT_PCI_LINK_DOWN = 0,
+
+	BUS_EVENT_INVALID = 0xFFFF,
 };
 
 struct cnss_hang_event {
@@ -89,6 +96,11 @@ struct cnss_hang_event {
 	u16 hang_event_data_len;
 };
 
+struct cnss_bus_event {
+	enum cnss_bus_event_type etype;
+	void *event_data;
+};
+
 struct cnss_uevent_data {
 	enum cnss_driver_status status;
 	void *data;