linux-kernel - [PATCH 1/3] staging: vchiq_core: Move remote_event_signal() vchiq

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Message-ID: <20240919142130.1331495-2-umang.jain@ideasonboard.com>
Date: Thu, 19 Sep 2024 19:51:28 +0530
From: Umang Jain <umang.jain@...asonboard.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>
Cc: linux-rpi-kernel@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-staging@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	Kieran Bingham <kieran.bingham@...asonboard.com>,
	Stefan Wahren <wahrenst@....net>,
	Umang Jain <umang.jain@...asonboard.com>
Subject: [PATCH 1/3] staging: vchiq_core: Move remote_event_signal() vchiq_core

The function remote_event_signal() is declared in vchiq_core.h while
defined in vchiq_arm.c and used only in vchiq_core.c. Move the
definition to vchiq_core.c as it is only used in this file.

Also convert it to static and drop the function signature from
vchiq_core.h header. BELL2 doorbell macro is also moved from vchiq_arm
to vchiq_core as part of this change.

No functional changes intended in this patch.

Signed-off-by: Umang Jain <umang.jain@...asonboard.com>
---
 .../interface/vchiq_arm/vchiq_arm.c           | 19 ----------------
 .../interface/vchiq_arm/vchiq_core.c          | 22 +++++++++++++++++++
 .../interface/vchiq_arm/vchiq_core.h          |  2 --
 3 files changed, 22 insertions(+), 21 deletions(-)

diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
index c44b4dc79c03..8e9a5c67a6de 100644
--- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
+++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
@@ -48,7 +48,6 @@
 #define VCHIQ_PLATFORM_FRAGMENTS_COUNT_IDX  1
 
 #define BELL0	0x00
-#define BELL2	0x08
 
 #define ARM_DS_ACTIVE	BIT(2)
 
@@ -616,24 +615,6 @@ static struct vchiq_arm_state *vchiq_platform_get_arm_state(struct vchiq_state *
 	return (struct vchiq_arm_state *)state->platform_state;
 }
 
-void
-remote_event_signal(struct vchiq_state *state, struct remote_event *event)
-{
-	struct vchiq_drv_mgmt *mgmt = dev_get_drvdata(state->dev);
-
-	/*
-	 * Ensure that all writes to shared data structures have completed
-	 * before signalling the peer.
-	 */
-	wmb();
-
-	event->fired = 1;
-
-	dsb(sy);         /* data barrier operation */
-
-	if (event->armed)
-		writel(0, mgmt->regs + BELL2); /* trigger vc interrupt */
-}
 
 int
 vchiq_prepare_bulk_data(struct vchiq_instance *instance, struct vchiq_bulk *bulk, void *offset,
diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.c b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.c
index 7ad43a3d1bab..88d510c6793a 100644
--- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.c
+++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.c
@@ -5,6 +5,7 @@
 #include <linux/completion.h>
 #include <linux/mutex.h>
 #include <linux/bitops.h>
+#include <linux/io.h>
 #include <linux/kthread.h>
 #include <linux/wait.h>
 #include <linux/delay.h>
@@ -61,6 +62,8 @@
 #define MAKE_REMOTE_USE			(VCHIQ_MSG_REMOTE_USE << TYPE_SHIFT)
 #define MAKE_REMOTE_USE_ACTIVE		(VCHIQ_MSG_REMOTE_USE_ACTIVE << TYPE_SHIFT)
 
+#define BELL2	0x08
+
 /* Ensure the fields are wide enough */
 static_assert(VCHIQ_MSG_SRCPORT(VCHIQ_MAKE_MSG(0, 0, VCHIQ_PORT_MAX))
 	== 0);
@@ -526,6 +529,25 @@ remote_event_wait(wait_queue_head_t *wq, struct remote_event *event)
 	return ret;
 }
 
+static void
+remote_event_signal(struct vchiq_state *state, struct remote_event *event)
+{
+	struct vchiq_drv_mgmt *mgmt = dev_get_drvdata(state->dev);
+
+	/*
+	 * Ensure that all writes to shared data structures have completed
+	 * before signalling the peer.
+	 */
+	wmb();
+
+	event->fired = 1;
+
+	dsb(sy);         /* data barrier operation */
+
+	if (event->armed)
+		writel(0, mgmt->regs + BELL2); /* trigger vc interrupt */
+}
+
 /*
  * Acknowledge that the event has been signalled, and wake any waiters. Usually
  * called as a result of the doorbell being rung.
diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h
index 5bf543dfc9c7..32b0521aa036 100644
--- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h
+++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h
@@ -534,8 +534,6 @@ int vchiq_prepare_bulk_data(struct vchiq_instance *instance, struct vchiq_bulk *
 
 void vchiq_complete_bulk(struct vchiq_instance *instance, struct vchiq_bulk *bulk);
 
-void remote_event_signal(struct vchiq_state *state, struct remote_event *event);
-
 void vchiq_dump_platform_state(struct seq_file *f);
 
 void vchiq_dump_platform_instances(struct vchiq_state *state, struct seq_file *f);
-- 
2.45.2