1. Patchew
  2. linux
  3. [PATCH v3 0/7] staging: vchiq_core: Refactor vchiq_bulk_transfer() logic
  4. View patch

[PATCH v3 3/7] staging: vchiq_core: Factor out bulk transfer for blocking mode

Umang Jain posted 7 patches 1 year, 5 months ago
There is a newer version of this series
[PATCH v3 3/7] staging: vchiq_core: Factor out bulk transfer for blocking mode
Posted by Umang Jain 1 year, 5 months ago 
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@ideasonboard.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 6e3d24d4b720..c46634f39f4b 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
Re: [PATCH v3 3/7] staging: vchiq_core: Factor out bulk transfer for blocking mode
Posted by Stefan Wahren 1 year, 5 months ago 
Hi Umang,

Am 01.09.24 um 08:18 schrieb Umang Jain:
> 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@ideasonboard.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 6e3d24d4b720..c46634f39f4b 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;
my comment in v1 about init of bulk_waiter applied to this one ...
> +	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;
and not to this one. I think this one here should be kept at least in
this patch.
>   	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,

Patchew 2.1-devel-b67e4c2

© 2016 - 2026 Red Hat, Inc.