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Message-ID: <20240831162435.191084-4-umang.jain@ideasonboard.com>
Date: Sat, 31 Aug 2024 21:54:31 +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 3/7] staging: vchiq_core: Factor out bulk transfer for blocking mode
Factor out bulk transfer for blocking mode into a separate dedicated
function bulk_xfer_blocking_interruptible(). It is suffixed by
"_interruptible" to denote that it can be interrupted and -EAGAIN
can be returned. It would be up to the users of the function to retry
the call in those cases.
Adjust the calls to vchiq-dev.c ioctl interface and vchiq_arm.c
for blocking bulk transfers.
Signed-off-by: Umang Jain <umang.jain@...asonboard.com>
---
.../interface/vchiq_arm/vchiq_arm.c | 5 +--
.../interface/vchiq_arm/vchiq_core.c | 44 ++++++++++++++++---
.../interface/vchiq_arm/vchiq_core.h | 5 +++
.../interface/vchiq_arm/vchiq_dev.c | 6 +++
4 files changed, 50 insertions(+), 10 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 c4d97dbf6ba8..688c9b1be868 100644
--- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
+++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
@@ -968,9 +968,8 @@ vchiq_blocking_bulk_transfer(struct vchiq_instance *instance, unsigned int handl
return -ENOMEM;
}
- ret = vchiq_bulk_transfer(instance, handle, data, NULL, size,
- &waiter->bulk_waiter,
- VCHIQ_BULK_MODE_BLOCKING, dir);
+ ret = vchiq_bulk_xfer_blocking_interruptible(instance, handle, data, NULL, size,
+ &waiter->bulk_waiter, dir);
if ((ret != -EAGAIN) || fatal_signal_pending(current) || !waiter->bulk_waiter.bulk) {
struct vchiq_bulk *bulk = waiter->bulk_waiter.bulk;
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 067259f55664..b37899d46b57 100644
--- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.c
+++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.c
@@ -2985,6 +2985,42 @@ vchiq_remove_service(struct vchiq_instance *instance, unsigned int handle)
return status;
}
+int
+vchiq_bulk_xfer_blocking_interruptible(struct vchiq_instance *instance, unsigned int handle,
+ void *offset, void __user *uoffset, int size,
+ void __user *userdata, enum vchiq_bulk_dir dir)
+{
+ struct vchiq_service *service = find_service_by_handle(instance, handle);
+ struct bulk_waiter *bulk_waiter = NULL;
+ enum vchiq_bulk_mode mode = VCHIQ_BULK_MODE_BLOCKING;
+ int status = -EINVAL;
+
+ if (!service)
+ return -EINVAL;
+
+ if (service->srvstate != VCHIQ_SRVSTATE_OPEN)
+ goto error_exit;
+
+ if (!offset && !uoffset)
+ goto error_exit;
+
+ if (vchiq_check_service(service))
+ goto error_exit;
+
+ bulk_waiter = userdata;
+ init_completion(&bulk_waiter->event);
+ bulk_waiter->actual = 0;
+ bulk_waiter->bulk = NULL;
+
+ status = vchiq_bulk_xfer_queue_msg_interruptible(service, offset, uoffset, size,
+ userdata, mode, dir);
+
+error_exit:
+ vchiq_service_put(service);
+
+ return status;
+}
+
/*
* This function may be called by kernel threads or user threads.
* User threads may receive -EAGAIN to indicate that a signal has been
@@ -2998,7 +3034,7 @@ int vchiq_bulk_transfer(struct vchiq_instance *instance, unsigned int handle,
enum vchiq_bulk_mode mode, enum vchiq_bulk_dir dir)
{
struct vchiq_service *service = find_service_by_handle(instance, handle);
- struct bulk_waiter *bulk_waiter = NULL;
+ struct bulk_waiter *bulk_waiter;
struct vchiq_bulk *bulk;
int status = -EINVAL;
@@ -3018,12 +3054,6 @@ int vchiq_bulk_transfer(struct vchiq_instance *instance, unsigned int handle,
case VCHIQ_BULK_MODE_NOCALLBACK:
case VCHIQ_BULK_MODE_CALLBACK:
break;
- case VCHIQ_BULK_MODE_BLOCKING:
- bulk_waiter = userdata;
- init_completion(&bulk_waiter->event);
- bulk_waiter->actual = 0;
- bulk_waiter->bulk = NULL;
- break;
default:
goto error_exit;
}
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 985d9ea3a06a..2dd89101c1c6 100644
--- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h
+++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h
@@ -474,6 +474,11 @@ extern int
vchiq_bulk_xfer_waiting_interruptible(struct vchiq_instance *instance,
unsigned int handle, struct bulk_waiter *userdata);
+extern int
+vchiq_bulk_xfer_blocking_interruptible(struct vchiq_instance *instance, unsigned int handle,
+ void *offset, void __user *uoffset, int size,
+ void __user *userdata, enum vchiq_bulk_dir dir);
+
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 550838d2863b..830633f2326b 100644
--- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_dev.c
+++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_dev.c
@@ -304,6 +304,12 @@ static int vchiq_irq_queue_bulk_tx_rx(struct vchiq_instance *instance,
}
userdata = &waiter->bulk_waiter;
+
+ status = vchiq_bulk_xfer_blocking_interruptible(instance, args->handle,
+ NULL, args->data, args->size,
+ userdata, dir);
+
+ goto bulk_transfer_handled;
} else if (args->mode == VCHIQ_BULK_MODE_WAITING) {
mutex_lock(&instance->bulk_waiter_list_mutex);
list_for_each_entry(iter, &instance->bulk_waiter_list,
--
2.45.2
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