From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Arnaud Pouliquen Subject: [PATCH v2 1/2] rpmsg: core: add possibility to get message payload length Date: Fri, 10 May 2019 17:02:56 +0200 Message-ID: <1557500577-22366-2-git-send-email-arnaud.pouliquen@st.com> In-Reply-To: <1557500577-22366-1-git-send-email-arnaud.pouliquen@st.com> References: <1557500577-22366-1-git-send-email-arnaud.pouliquen@st.com> MIME-Version: 1.0 Content-Type: text/plain To: Ohad Ben-Cohen , Bjorn Andersson , Greg Kroah-Hartman , Jiri Slaby , xiang xiao , linux-kernel@vger.kernel.org, linux-remoteproc@vger.kernel.org Cc: arnaud.pouliquen@st.com, Fabien DESSENNE List-ID: Return the rpmsg buffer payload size for sending message, so rpmsg users can split a long message in several sub rpmsg buffers. Signed-off-by: Arnaud Pouliquen Signed-off-by: Fabien Dessenne --- drivers/rpmsg/rpmsg_core.c | 20 ++++++++++++++++++++ drivers/rpmsg/rpmsg_internal.h | 2 ++ drivers/rpmsg/virtio_rpmsg_bus.c | 11 +++++++++++ include/linux/rpmsg.h | 10 ++++++++++ 4 files changed, 43 insertions(+) diff --git a/drivers/rpmsg/rpmsg_core.c b/drivers/rpmsg/rpmsg_core.c index 8122807db380..75c8c403ffe5 100644 --- a/drivers/rpmsg/rpmsg_core.c +++ b/drivers/rpmsg/rpmsg_core.c @@ -283,6 +283,26 @@ int rpmsg_trysend_offchannel(struct rpmsg_endpoint *ept, u32 src, u32 dst, } EXPORT_SYMBOL(rpmsg_trysend_offchannel); +/** + * rpmsg_get_buf_payload_size() + * This function returns buffer payload size available for sending messages. + * + * @ept: the rpmsg endpoint + * + * Returns buffer payload size on success and an appropriate error value on + * failure. + */ +int rpmsg_get_buf_payload_size(struct rpmsg_endpoint *ept) +{ + if (WARN_ON(!ept)) + return -EINVAL; + if (!ept->ops->get_buf_payload_size) + return -ENXIO; + + return ept->ops->get_buf_payload_size(ept); +} +EXPORT_SYMBOL(rpmsg_get_buf_payload_size); + /* * match an rpmsg channel with a channel info struct. * this is used to make sure we're not creating rpmsg devices for channels diff --git a/drivers/rpmsg/rpmsg_internal.h b/drivers/rpmsg/rpmsg_internal.h index 0d791c30b7ea..6f733a556139 100644 --- a/drivers/rpmsg/rpmsg_internal.h +++ b/drivers/rpmsg/rpmsg_internal.h @@ -46,6 +46,7 @@ struct rpmsg_device_ops { * @trysend: see @rpmsg_trysend(), required * @trysendto: see @rpmsg_trysendto(), optional * @trysend_offchannel: see @rpmsg_trysend_offchannel(), optional + * @get_buf_payload_size: see @rpmsg_get_buf_payload_size(), optional * * Indirection table for the operations that a rpmsg backend should implement. * In addition to @destroy_ept, the backend must at least implement @send and @@ -65,6 +66,7 @@ struct rpmsg_endpoint_ops { void *data, int len); __poll_t (*poll)(struct rpmsg_endpoint *ept, struct file *filp, poll_table *wait); + int (*get_buf_payload_size)(struct rpmsg_endpoint *ept); }; int rpmsg_register_device(struct rpmsg_device *rpdev); diff --git a/drivers/rpmsg/virtio_rpmsg_bus.c b/drivers/rpmsg/virtio_rpmsg_bus.c index 5d3685bd76a2..82753e76e377 100644 --- a/drivers/rpmsg/virtio_rpmsg_bus.c +++ b/drivers/rpmsg/virtio_rpmsg_bus.c @@ -175,6 +175,7 @@ static int virtio_rpmsg_trysendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst); static int virtio_rpmsg_trysend_offchannel(struct rpmsg_endpoint *ept, u32 src, u32 dst, void *data, int len); +static int virtio_get_buf_payload_size(struct rpmsg_endpoint *ept); static const struct rpmsg_endpoint_ops virtio_endpoint_ops = { .destroy_ept = virtio_rpmsg_destroy_ept, @@ -184,6 +185,7 @@ static const struct rpmsg_endpoint_ops virtio_endpoint_ops = { .trysend = virtio_rpmsg_trysend, .trysendto = virtio_rpmsg_trysendto, .trysend_offchannel = virtio_rpmsg_trysend_offchannel, + .get_buf_payload_size = virtio_get_buf_payload_size, }; /** @@ -699,6 +701,15 @@ static int virtio_rpmsg_trysend_offchannel(struct rpmsg_endpoint *ept, u32 src, return rpmsg_send_offchannel_raw(rpdev, src, dst, data, len, false); } +static int virtio_get_buf_payload_size(struct rpmsg_endpoint *ept) +{ + struct rpmsg_device *rpdev = ept->rpdev; + struct virtio_rpmsg_channel *vch = to_virtio_rpmsg_channel(rpdev); + int size = vch->vrp->buf_size - sizeof(struct rpmsg_hdr); + + return size < 0 ? -EMSGSIZE : size; +} + static int rpmsg_recv_single(struct virtproc_info *vrp, struct device *dev, struct rpmsg_hdr *msg, unsigned int len) { diff --git a/include/linux/rpmsg.h b/include/linux/rpmsg.h index 9fe156d1c018..250df2165086 100644 --- a/include/linux/rpmsg.h +++ b/include/linux/rpmsg.h @@ -135,6 +135,8 @@ int rpmsg_trysend_offchannel(struct rpmsg_endpoint *ept, u32 src, u32 dst, __poll_t rpmsg_poll(struct rpmsg_endpoint *ept, struct file *filp, poll_table *wait); +int rpmsg_get_buf_payload_size(struct rpmsg_endpoint *ept); + #else static inline int register_rpmsg_device(struct rpmsg_device *dev) @@ -242,6 +244,14 @@ static inline __poll_t rpmsg_poll(struct rpmsg_endpoint *ept, return 0; } +static int rpmsg_get_buf_payload_size(struct rpmsg_endpoint *ept) +{ + /* This shouldn't be possible */ + WARN_ON(1); + + return -ENXIO; +} + #endif /* IS_ENABLED(CONFIG_RPMSG) */ /* use a macro to avoid include chaining to get THIS_MODULE */ -- 2.7.4