From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Bjorn Andersson Subject: [PATCH v2 1/4] rpmsg: Introduce "poll" to endpoint ops Date: Fri, 2 Dec 2016 14:03:34 -0800 Message-Id: <1480716217-23303-1-git-send-email-bjorn.andersson@linaro.org> To: Ohad Ben-Cohen , Bjorn Andersson Cc: linux-remoteproc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org List-ID: This allows rpmsg backends to implement polling of the outgoing buffer, which provides poll support to user space when using the rpmsg character device. Signed-off-by: Bjorn Andersson --- Changes since v1: - New patch drivers/rpmsg/rpmsg_core.c | 20 ++++++++++++++++++++ drivers/rpmsg/rpmsg_internal.h | 3 +++ include/linux/rpmsg.h | 13 +++++++++++++ 3 files changed, 36 insertions(+) diff --git a/drivers/rpmsg/rpmsg_core.c b/drivers/rpmsg/rpmsg_core.c index a79cb5a9e5f2..5ec8a06c24fa 100644 --- a/drivers/rpmsg/rpmsg_core.c +++ b/drivers/rpmsg/rpmsg_core.c @@ -240,6 +240,26 @@ int rpmsg_trysendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst) EXPORT_SYMBOL(rpmsg_trysendto); /** + * rpmsg_poll() - poll the endpoint's send buffers + * @ept: the rpmsg endpoint + * @filp: file for poll_wait() + * @wait: poll_table for poll_wait() + * + * Returns mask representing the current state of the endpoint's send buffers + */ +unsigned int rpmsg_poll(struct rpmsg_endpoint *ept, struct file *filp, + poll_table *wait) +{ + if (WARN_ON(!ept)) + return 0; + if (!ept->ops->poll) + return 0; + + return ept->ops->poll(ept, filp, wait); +} +EXPORT_SYMBOL(rpmsg_poll); + +/** * rpmsg_send_offchannel() - send a message using explicit src/dst addresses * @ept: the rpmsg endpoint * @src: source address diff --git a/drivers/rpmsg/rpmsg_internal.h b/drivers/rpmsg/rpmsg_internal.h index 8075a20f919b..6176f2457b6b 100644 --- a/drivers/rpmsg/rpmsg_internal.h +++ b/drivers/rpmsg/rpmsg_internal.h @@ -21,6 +21,7 @@ #define __RPMSG_INTERNAL_H__ #include +#include #define to_rpmsg_device(d) container_of(d, struct rpmsg_device, dev) #define to_rpmsg_driver(d) container_of(d, struct rpmsg_driver, drv) @@ -70,6 +71,8 @@ struct rpmsg_endpoint_ops { int (*trysendto)(struct rpmsg_endpoint *ept, void *data, int len, u32 dst); int (*trysend_offchannel)(struct rpmsg_endpoint *ept, u32 src, u32 dst, void *data, int len); + unsigned int (*poll)(struct rpmsg_endpoint *ept, struct file *filp, + poll_table *wait); }; int rpmsg_register_device(struct rpmsg_device *rpdev); diff --git a/include/linux/rpmsg.h b/include/linux/rpmsg.h index 18f9e1ae4b7e..10d6ae8bbb7d 100644 --- a/include/linux/rpmsg.h +++ b/include/linux/rpmsg.h @@ -41,6 +41,7 @@ #include #include #include +#include #define RPMSG_ADDR_ANY 0xFFFFFFFF @@ -156,6 +157,9 @@ int rpmsg_trysendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst); int rpmsg_trysend_offchannel(struct rpmsg_endpoint *ept, u32 src, u32 dst, void *data, int len); +unsigned int rpmsg_poll(struct rpmsg_endpoint *ept, struct file *filp, + poll_table *wait); + #else static inline int register_rpmsg_device(struct rpmsg_device *dev) @@ -254,6 +258,15 @@ static inline int rpmsg_trysend_offchannel(struct rpmsg_endpoint *ept, u32 src, return -ENXIO; } +static inline unsigned int rpmsg_poll(struct rpmsg_endpoint *ept, + struct file *filp, poll_table *wait) +{ + /* This shouldn't be possible */ + WARN_ON(1); + + return 0; +} + #endif /* IS_ENABLED(CONFIG_RPMSG) */ /* use a macro to avoid include chaining to get THIS_MODULE */ -- 2.5.0