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Message-ID: <20240831162435.191084-2-umang.jain@ideasonboard.com>
Date: Sat, 31 Aug 2024 21:54:29 +0530
From: Umang Jain <umang.jain@...asonboard.com>
To: Florian Fainelli <florian.fainelli@...adcom.com>,
Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>
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>,
Arnd Bergmann <arnd@...db.de>,
Stefan Wahren <wahrenst@....net>,
Dave Stevenson <dave.stevenson@...pberrypi.com>,
Phil Elwell <phil@...pberrypi.com>,
Laurent Pinchart <laurent.pinchart@...asonboard.com>,
Umang Jain <umang.jain@...asonboard.com>
Subject: [PATCH v2 1/7] staging: vchiq: Factor out bulk transfer for VCHIQ_BULK_MODE_WAITING
The bulk transfer is VCHIQ_BULK_MODE_WAITING is used by VCHIQ ioctl
interface. It is factored out to a separate function from
vchiq_bulk_transfer() to bulk_xfer_waiting_interruptible().
This is a part of vchiq_bulk_transfer refactoring. Each bulk mode
will have their dedicated functions to execute bulk transfers.
Each mode will be handled separately in subsequent patches.
bulk_xfer_waiting_interruptible() is suffixed with "_interruptible"
to denote that it can be interrupted when a signal is received.
-EAGAIN maybe returned in those cases, similar to what
vchiq_bulk_transfer() does.
Adjust the vchiq_irq_queue_bulk_tx_rx() in the vchiq-dev.c to call
bulk_xfer_waiting_interruptible() for waiting mode. A temporary
goto label has been introduced to jump the call execution over
vchiq_bulk_transfer() for waiting mode only. When all dedicated bulk
transfer calls are introduced, this label shall be dropped.
No function changes intended in this patch.
Signed-off-by: Umang Jain <umang.jain@...asonboard.com>
---
.../interface/vchiq_arm/vchiq_core.c | 51 +++++++++++++++++--
.../interface/vchiq_arm/vchiq_core.h | 4 ++
.../interface/vchiq_arm/vchiq_dev.c | 5 ++
3 files changed, 55 insertions(+), 5 deletions(-)
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 50af04b217f4..7db76e309d3f 100644
--- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.c
+++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.c
@@ -3023,10 +3023,6 @@ int vchiq_bulk_transfer(struct vchiq_instance *instance, unsigned int handle,
bulk_waiter->actual = 0;
bulk_waiter->bulk = NULL;
break;
- case VCHIQ_BULK_MODE_WAITING:
- bulk_waiter = userdata;
- bulk = bulk_waiter->bulk;
- goto waiting;
default:
goto error_exit;
}
@@ -3115,7 +3111,6 @@ int vchiq_bulk_transfer(struct vchiq_instance *instance, unsigned int handle,
state->id, service->localport, dir_char, queue->local_insert,
queue->remote_insert, queue->process);
-waiting:
vchiq_service_put(service);
status = 0;
@@ -3143,6 +3138,52 @@ int vchiq_bulk_transfer(struct vchiq_instance *instance, unsigned int handle,
return status;
}
+/*
+ * This function is called by VCHIQ ioctl interface and is interruptible.
+ * It may receive -EAGAIN to indicate that a signal has been received
+ * and the call should be retried after being returned to user context.
+ */
+int
+vchiq_bulk_xfer_waiting_interruptible(struct vchiq_instance *instance,
+ unsigned int handle, struct bulk_waiter *userdata)
+{
+ struct vchiq_service *service = find_service_by_handle(instance, handle);
+ struct bulk_waiter *bulk_waiter;
+ struct vchiq_bulk *bulk;
+ int status = -EINVAL;
+
+ if (!service)
+ goto error_exit;
+
+ if (!userdata)
+ goto error_exit;
+
+ if (service->srvstate != VCHIQ_SRVSTATE_OPEN)
+ goto error_exit;
+
+ if (vchiq_check_service(service))
+ goto error_exit;
+
+ bulk_waiter = userdata;
+ bulk = bulk_waiter->bulk;
+
+ vchiq_service_put(service);
+
+ status = 0;
+
+ if (wait_for_completion_interruptible(&bulk_waiter->event))
+ return -EAGAIN;
+ else if (bulk_waiter->actual == VCHIQ_BULK_ACTUAL_ABORTED)
+ return -EINVAL;
+
+ return status;
+
+error_exit:
+ if (service)
+ vchiq_service_put(service);
+ return status;
+}
+
int
vchiq_queue_message(struct vchiq_instance *instance, unsigned int handle,
ssize_t (*copy_callback)(void *context, void *dest,
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 77cc4d7ac077..985d9ea3a06a 100644
--- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h
+++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h
@@ -470,6 +470,10 @@ vchiq_shutdown_internal(struct vchiq_state *state, struct vchiq_instance *instan
extern void
remote_event_pollall(struct vchiq_state *state);
+extern int
+vchiq_bulk_xfer_waiting_interruptible(struct vchiq_instance *instance,
+ unsigned int handle, struct bulk_waiter *userdata);
+
extern int
vchiq_bulk_transfer(struct vchiq_instance *instance, unsigned int handle, void *offset,
void __user *uoffset, int size, void *userdata, enum vchiq_bulk_mode mode,
diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_dev.c b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_dev.c
index 9cd2a64dce5e..550838d2863b 100644
--- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_dev.c
+++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_dev.c
@@ -324,6 +324,10 @@ static int vchiq_irq_queue_bulk_tx_rx(struct vchiq_instance *instance,
dev_dbg(service->state->dev, "arm: found bulk_waiter %pK for pid %d\n",
waiter, current->pid);
userdata = &waiter->bulk_waiter;
+
+ status = vchiq_bulk_xfer_waiting_interruptible(instance, args->handle, userdata);
+
+ goto bulk_transfer_handled;
} else {
userdata = args->userdata;
}
@@ -331,6 +335,7 @@ static int vchiq_irq_queue_bulk_tx_rx(struct vchiq_instance *instance,
status = vchiq_bulk_transfer(instance, args->handle, NULL, args->data, args->size,
userdata, args->mode, dir);
+bulk_transfer_handled:
if (!waiter) {
ret = 0;
goto out;
--
2.45.2
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