rpmsg updates for v4.9
The bulk of these patches involve splitting the rpmsg implementation into a framework/API part and a virtio specific backend part. It then adds the Qualcomm Shared Memory Device (SMD) as an additional supported wire format. Also included is a set of code style cleanups that have been lingering for a while. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAABAgAGBQJX9XANAAoJEAsfOT8Nma3FwocP/1EMKjeyMOiyS/giPNye7EjQ 3EIms4Or6F4ULo+/mZTgyF69RGBirFgYm2GKs2GgFcAnf4bZRmXpPNYiuJZ8LGQe 9gep35eZ+vE+KArba26Sau1bjpPiWsokeJg7JPBj8KE3uR1lH3QTVjoHa3dPXRwa NrImfZw3P2/RTgtIoDJA6CoCT8cBIiitcA++1bNGhHTu7R5hkw25mse1OFJ8sb1l D3rsnmoTcXZqY2dDA9GYqy9/krBU69Xe7QJYCyjuNI0FHIqS60M/gTJS+v4fxJbX ueM7Qsimdbmcm/tINeT3RcyM0gUrGukDgrEhwg+Ipohhji9tf7AYx0hIJ11Ylzq+ m2orJ5xDRg3/mxFMFg4bqWXKt0uYUSBMiztAneCdOdTPR5DBpVB47/i+Nqq0t5fm Ql7Ev4G877A2cZp3O/xHahGCzk9xeAWnRonGeWGqIS0V2tCXWMuVtzwBB5oa0Pd0 nlb9JFnmb2lzU5ud/y681B7LdwDEjlW8o8u7JPOqEbXTVEjOebdy/nXpBCg7I9Ik NwQLOQ8B5eOGcrki7W7qodx8BCMyEFsHrRoozdvloXePCgwOuhA5s+Ai8VqJi9Yr 9xpQpd4QHtbYHXbyM4/Pn/93MTIclcHNdE8D2qJ4/nlVtbbjwQe8p2cT7THfXTK+ GVqj+PrmRoiVS9MQ0C+1 =3bKf -----END PGP SIGNATURE----- Merge tag 'rpmsg-v4.9' of git://github.com/andersson/remoteproc Pull rpmsg updates from Bjorn Andersson: "The bulk of these patches involve splitting the rpmsg implementation into a framework/API part and a virtio specific backend part. It then adds the Qualcomm Shared Memory Device (SMD) as an additional supported wire format. Also included is a set of code style cleanups that have been lingering for a while" * tag 'rpmsg-v4.9' of git://github.com/andersson/remoteproc: (26 commits) rpmsg: smd: fix dependency on QCOM_SMD=n rpmsg: Introduce Qualcomm SMD backend rpmsg: Allow callback to return errors rpmsg: Move virtio specifics from public header rpmsg: virtio: Hide vrp pointer from the public API rpmsg: Hide rpmsg indirection tables rpmsg: Split rpmsg core and virtio backend rpmsg: Split off generic tail of create_channel() rpmsg: Move helper for finding rpmsg devices to core rpmsg: Move endpoint related interface to rpmsg core rpmsg: Indirection table for rpmsg_endpoint operations rpmsg: Move rpmsg_device API to new file rpmsg: Introduce indirection table for rpmsg_device operations rpmsg: Clean up rpmsg device vs channel naming rpmsg: Make rpmsg_create_ept() take channel_info struct rpmsg: rpmsg_send() operations takes rpmsg_endpoint rpmsg: Name rpmsg devices based on channel id rpmsg: Enable matching devices with drivers based on DT rpmsg: Drop prototypes for non-existing functions samples/rpmsg: add support for multiple instances ...
This commit is contained in:
Linus Torvalds
Коммит
521f397085
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|
@ -17,7 +17,7 @@ config OMAP_REMOTEPROC
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|||
select REMOTEPROC
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select MAILBOX
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select OMAP2PLUS_MBOX
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select RPMSG
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select RPMSG_VIRTIO
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help
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||||
Say y here to support OMAP's remote processors (dual M3
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and DSP on OMAP4) via the remote processor framework.
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|
|
@ -59,7 +59,7 @@ config DA8XX_REMOTEPROC
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depends on ARCH_DAVINCI_DA8XX
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select CMA if MMU
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select REMOTEPROC
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select RPMSG
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select RPMSG_VIRTIO
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help
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Say y here to support DA8xx/OMAP-L13x remote processors via the
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remote processor framework.
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|
|
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|
|
@ -3,6 +3,20 @@ menu "Rpmsg drivers"
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# RPMSG always gets selected by whoever wants it
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config RPMSG
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tristate
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config RPMSG_QCOM_SMD
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tristate "Qualcomm Shared Memory Driver (SMD)"
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depends on QCOM_SMEM
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depends on QCOM_SMD=n
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select RPMSG
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help
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Say y here to enable support for the Qualcomm Shared Memory Driver
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providing communication channels to remote processors in Qualcomm
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platforms.
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config RPMSG_VIRTIO
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tristate
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select RPMSG
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select VIRTIO
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select VIRTUALIZATION
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|
|
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|
@ -1 +1,3 @@
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obj-$(CONFIG_RPMSG) += virtio_rpmsg_bus.o
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obj-$(CONFIG_RPMSG) += rpmsg_core.o
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obj-$(CONFIG_RPMSG_QCOM_SMD) += qcom_smd.o
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obj-$(CONFIG_RPMSG_VIRTIO) += virtio_rpmsg_bus.o
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|
|
|
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Разница между файлами не показана из-за своего большого размера
Загрузить разницу
|
|
@ -0,0 +1,498 @@
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|||
/*
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* remote processor messaging bus
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*
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* Copyright (C) 2011 Texas Instruments, Inc.
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* Copyright (C) 2011 Google, Inc.
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*
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* Ohad Ben-Cohen <ohad@wizery.com>
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* Brian Swetland <swetland@google.com>
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*
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* This software is licensed under the terms of the GNU General Public
|
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
|
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
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* GNU General Public License for more details.
|
||||
*/
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|
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#define pr_fmt(fmt) "%s: " fmt, __func__
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/rpmsg.h>
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#include <linux/of_device.h>
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#include <linux/slab.h>
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|
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#include "rpmsg_internal.h"
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|
||||
/**
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* rpmsg_create_ept() - create a new rpmsg_endpoint
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* @rpdev: rpmsg channel device
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||||
* @cb: rx callback handler
|
||||
* @priv: private data for the driver's use
|
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* @chinfo: channel_info with the local rpmsg address to bind with @cb
|
||||
*
|
||||
* Every rpmsg address in the system is bound to an rx callback (so when
|
||||
* inbound messages arrive, they are dispatched by the rpmsg bus using the
|
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* appropriate callback handler) by means of an rpmsg_endpoint struct.
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*
|
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* This function allows drivers to create such an endpoint, and by that,
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* bind a callback, and possibly some private data too, to an rpmsg address
|
||||
* (either one that is known in advance, or one that will be dynamically
|
||||
* assigned for them).
|
||||
*
|
||||
* Simple rpmsg drivers need not call rpmsg_create_ept, because an endpoint
|
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* is already created for them when they are probed by the rpmsg bus
|
||||
* (using the rx callback provided when they registered to the rpmsg bus).
|
||||
*
|
||||
* So things should just work for simple drivers: they already have an
|
||||
* endpoint, their rx callback is bound to their rpmsg address, and when
|
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* relevant inbound messages arrive (i.e. messages which their dst address
|
||||
* equals to the src address of their rpmsg channel), the driver's handler
|
||||
* is invoked to process it.
|
||||
*
|
||||
* That said, more complicated drivers might do need to allocate
|
||||
* additional rpmsg addresses, and bind them to different rx callbacks.
|
||||
* To accomplish that, those drivers need to call this function.
|
||||
*
|
||||
* Drivers should provide their @rpdev channel (so the new endpoint would belong
|
||||
* to the same remote processor their channel belongs to), an rx callback
|
||||
* function, an optional private data (which is provided back when the
|
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* rx callback is invoked), and an address they want to bind with the
|
||||
* callback. If @addr is RPMSG_ADDR_ANY, then rpmsg_create_ept will
|
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* dynamically assign them an available rpmsg address (drivers should have
|
||||
* a very good reason why not to always use RPMSG_ADDR_ANY here).
|
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*
|
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* Returns a pointer to the endpoint on success, or NULL on error.
|
||||
*/
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||||
struct rpmsg_endpoint *rpmsg_create_ept(struct rpmsg_device *rpdev,
|
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rpmsg_rx_cb_t cb, void *priv,
|
||||
struct rpmsg_channel_info chinfo)
|
||||
{
|
||||
return rpdev->ops->create_ept(rpdev, cb, priv, chinfo);
|
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}
|
||||
EXPORT_SYMBOL(rpmsg_create_ept);
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||||
|
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/**
|
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* rpmsg_destroy_ept() - destroy an existing rpmsg endpoint
|
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* @ept: endpoing to destroy
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*
|
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* Should be used by drivers to destroy an rpmsg endpoint previously
|
||||
* created with rpmsg_create_ept().
|
||||
*/
|
||||
void rpmsg_destroy_ept(struct rpmsg_endpoint *ept)
|
||||
{
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||||
ept->ops->destroy_ept(ept);
|
||||
}
|
||||
EXPORT_SYMBOL(rpmsg_destroy_ept);
|
||||
|
||||
/**
|
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* rpmsg_send() - send a message across to the remote processor
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* @ept: the rpmsg endpoint
|
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* @data: payload of message
|
||||
* @len: length of payload
|
||||
*
|
||||
* This function sends @data of length @len on the @ept endpoint.
|
||||
* The message will be sent to the remote processor which the @ept
|
||||
* endpoint belongs to, using @ept's address and its associated rpmsg
|
||||
* device destination addresses.
|
||||
* In case there are no TX buffers available, the function will block until
|
||||
* one becomes available, or a timeout of 15 seconds elapses. When the latter
|
||||
* happens, -ERESTARTSYS is returned.
|
||||
*
|
||||
* Can only be called from process context (for now).
|
||||
*
|
||||
* Returns 0 on success and an appropriate error value on failure.
|
||||
*/
|
||||
int rpmsg_send(struct rpmsg_endpoint *ept, void *data, int len)
|
||||
{
|
||||
return ept->ops->send(ept, data, len);
|
||||
}
|
||||
EXPORT_SYMBOL(rpmsg_send);
|
||||
|
||||
/**
|
||||
* rpmsg_sendto() - send a message across to the remote processor, specify dst
|
||||
* @ept: the rpmsg endpoint
|
||||
* @data: payload of message
|
||||
* @len: length of payload
|
||||
* @dst: destination address
|
||||
*
|
||||
* This function sends @data of length @len to the remote @dst address.
|
||||
* The message will be sent to the remote processor which the @ept
|
||||
* endpoint belongs to, using @ept's address as source.
|
||||
* In case there are no TX buffers available, the function will block until
|
||||
* one becomes available, or a timeout of 15 seconds elapses. When the latter
|
||||
* happens, -ERESTARTSYS is returned.
|
||||
*
|
||||
* Can only be called from process context (for now).
|
||||
*
|
||||
* Returns 0 on success and an appropriate error value on failure.
|
||||
*/
|
||||
int rpmsg_sendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst)
|
||||
{
|
||||
return ept->ops->sendto(ept, data, len, dst);
|
||||
}
|
||||
EXPORT_SYMBOL(rpmsg_sendto);
|
||||
|
||||
/**
|
||||
* rpmsg_send_offchannel() - send a message using explicit src/dst addresses
|
||||
* @ept: the rpmsg endpoint
|
||||
* @src: source address
|
||||
* @dst: destination address
|
||||
* @data: payload of message
|
||||
* @len: length of payload
|
||||
*
|
||||
* This function sends @data of length @len to the remote @dst address,
|
||||
* and uses @src as the source address.
|
||||
* The message will be sent to the remote processor which the @ept
|
||||
* endpoint belongs to.
|
||||
* In case there are no TX buffers available, the function will block until
|
||||
* one becomes available, or a timeout of 15 seconds elapses. When the latter
|
||||
* happens, -ERESTARTSYS is returned.
|
||||
*
|
||||
* Can only be called from process context (for now).
|
||||
*
|
||||
* Returns 0 on success and an appropriate error value on failure.
|
||||
*/
|
||||
int rpmsg_send_offchannel(struct rpmsg_endpoint *ept, u32 src, u32 dst,
|
||||
void *data, int len)
|
||||
{
|
||||
return ept->ops->send_offchannel(ept, src, dst, data, len);
|
||||
}
|
||||
EXPORT_SYMBOL(rpmsg_send_offchannel);
|
||||
|
||||
/**
|
||||
* rpmsg_send() - send a message across to the remote processor
|
||||
* @ept: the rpmsg endpoint
|
||||
* @data: payload of message
|
||||
* @len: length of payload
|
||||
*
|
||||
* This function sends @data of length @len on the @ept endpoint.
|
||||
* The message will be sent to the remote processor which the @ept
|
||||
* endpoint belongs to, using @ept's address as source and its associated
|
||||
* rpdev's address as destination.
|
||||
* In case there are no TX buffers available, the function will immediately
|
||||
* return -ENOMEM without waiting until one becomes available.
|
||||
*
|
||||
* Can only be called from process context (for now).
|
||||
*
|
||||
* Returns 0 on success and an appropriate error value on failure.
|
||||
*/
|
||||
int rpmsg_trysend(struct rpmsg_endpoint *ept, void *data, int len)
|
||||
{
|
||||
return ept->ops->trysend(ept, data, len);
|
||||
}
|
||||
EXPORT_SYMBOL(rpmsg_trysend);
|
||||
|
||||
/**
|
||||
* rpmsg_sendto() - send a message across to the remote processor, specify dst
|
||||
* @ept: the rpmsg endpoint
|
||||
* @data: payload of message
|
||||
* @len: length of payload
|
||||
* @dst: destination address
|
||||
*
|
||||
* This function sends @data of length @len to the remote @dst address.
|
||||
* The message will be sent to the remote processor which the @ept
|
||||
* endpoint belongs to, using @ept's address as source.
|
||||
* In case there are no TX buffers available, the function will immediately
|
||||
* return -ENOMEM without waiting until one becomes available.
|
||||
*
|
||||
* Can only be called from process context (for now).
|
||||
*
|
||||
* Returns 0 on success and an appropriate error value on failure.
|
||||
*/
|
||||
int rpmsg_trysendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst)
|
||||
{
|
||||
return ept->ops->trysendto(ept, data, len, dst);
|
||||
}
|
||||
EXPORT_SYMBOL(rpmsg_trysendto);
|
||||
|
||||
/**
|
||||
* rpmsg_send_offchannel() - send a message using explicit src/dst addresses
|
||||
* @ept: the rpmsg endpoint
|
||||
* @src: source address
|
||||
* @dst: destination address
|
||||
* @data: payload of message
|
||||
* @len: length of payload
|
||||
*
|
||||
* This function sends @data of length @len to the remote @dst address,
|
||||
* and uses @src as the source address.
|
||||
* The message will be sent to the remote processor which the @ept
|
||||
* endpoint belongs to.
|
||||
* In case there are no TX buffers available, the function will immediately
|
||||
* return -ENOMEM without waiting until one becomes available.
|
||||
*
|
||||
* Can only be called from process context (for now).
|
||||
*
|
||||
* Returns 0 on success and an appropriate error value on failure.
|
||||
*/
|
||||
int rpmsg_trysend_offchannel(struct rpmsg_endpoint *ept, u32 src, u32 dst,
|
||||
void *data, int len)
|
||||
{
|
||||
return ept->ops->trysend_offchannel(ept, src, dst, data, len);
|
||||
}
|
||||
EXPORT_SYMBOL(rpmsg_trysend_offchannel);
|
||||
|
||||
/*
|
||||
* match an rpmsg channel with a channel info struct.
|
||||
* this is used to make sure we're not creating rpmsg devices for channels
|
||||
* that already exist.
|
||||
*/
|
||||
static int rpmsg_device_match(struct device *dev, void *data)
|
||||
{
|
||||
struct rpmsg_channel_info *chinfo = data;
|
||||
struct rpmsg_device *rpdev = to_rpmsg_device(dev);
|
||||
|
||||
if (chinfo->src != RPMSG_ADDR_ANY && chinfo->src != rpdev->src)
|
||||
return 0;
|
||||
|
||||
if (chinfo->dst != RPMSG_ADDR_ANY && chinfo->dst != rpdev->dst)
|
||||
return 0;
|
||||
|
||||
if (strncmp(chinfo->name, rpdev->id.name, RPMSG_NAME_SIZE))
|
||||
return 0;
|
||||
|
||||
/* found a match ! */
|
||||
return 1;
|
||||
}
|
||||
|
||||
struct device *rpmsg_find_device(struct device *parent,
|
||||
struct rpmsg_channel_info *chinfo)
|
||||
{
|
||||
return device_find_child(parent, chinfo, rpmsg_device_match);
|
||||
|
||||
}
|
||||
EXPORT_SYMBOL(rpmsg_find_device);
|
||||
|
||||
/* sysfs show configuration fields */
|
||||
#define rpmsg_show_attr(field, path, format_string) \
|
||||
static ssize_t \
|
||||
field##_show(struct device *dev, \
|
||||
struct device_attribute *attr, char *buf) \
|
||||
{ \
|
||||
struct rpmsg_device *rpdev = to_rpmsg_device(dev); \
|
||||
\
|
||||
return sprintf(buf, format_string, rpdev->path); \
|
||||
}
|
||||
|
||||
/* for more info, see Documentation/ABI/testing/sysfs-bus-rpmsg */
|
||||
rpmsg_show_attr(name, id.name, "%s\n");
|
||||
rpmsg_show_attr(src, src, "0x%x\n");
|
||||
rpmsg_show_attr(dst, dst, "0x%x\n");
|
||||
rpmsg_show_attr(announce, announce ? "true" : "false", "%s\n");
|
||||
|
||||
static ssize_t modalias_show(struct device *dev,
|
||||
struct device_attribute *attr, char *buf)
|
||||
{
|
||||
struct rpmsg_device *rpdev = to_rpmsg_device(dev);
|
||||
|
||||
return sprintf(buf, RPMSG_DEVICE_MODALIAS_FMT "\n", rpdev->id.name);
|
||||
}
|
||||
|
||||
static struct device_attribute rpmsg_dev_attrs[] = {
|
||||
__ATTR_RO(name),
|
||||
__ATTR_RO(modalias),
|
||||
__ATTR_RO(dst),
|
||||
__ATTR_RO(src),
|
||||
__ATTR_RO(announce),
|
||||
__ATTR_NULL
|
||||
};
|
||||
|
||||
/* rpmsg devices and drivers are matched using the service name */
|
||||
static inline int rpmsg_id_match(const struct rpmsg_device *rpdev,
|
||||
const struct rpmsg_device_id *id)
|
||||
{
|
||||
return strncmp(id->name, rpdev->id.name, RPMSG_NAME_SIZE) == 0;
|
||||
}
|
||||
|
||||
/* match rpmsg channel and rpmsg driver */
|
||||
static int rpmsg_dev_match(struct device *dev, struct device_driver *drv)
|
||||
{
|
||||
struct rpmsg_device *rpdev = to_rpmsg_device(dev);
|
||||
struct rpmsg_driver *rpdrv = to_rpmsg_driver(drv);
|
||||
const struct rpmsg_device_id *ids = rpdrv->id_table;
|
||||
unsigned int i;
|
||||
|
||||
if (ids)
|
||||
for (i = 0; ids[i].name[0]; i++)
|
||||
if (rpmsg_id_match(rpdev, &ids[i]))
|
||||
return 1;
|
||||
|
||||
return of_driver_match_device(dev, drv);
|
||||
}
|
||||
|
||||
static int rpmsg_uevent(struct device *dev, struct kobj_uevent_env *env)
|
||||
{
|
||||
struct rpmsg_device *rpdev = to_rpmsg_device(dev);
|
||||
|
||||
return add_uevent_var(env, "MODALIAS=" RPMSG_DEVICE_MODALIAS_FMT,
|
||||
rpdev->id.name);
|
||||
}
|
||||
|
||||
/*
|
||||
* when an rpmsg driver is probed with a channel, we seamlessly create
|
||||
* it an endpoint, binding its rx callback to a unique local rpmsg
|
||||
* address.
|
||||
*
|
||||
* if we need to, we also announce about this channel to the remote
|
||||
* processor (needed in case the driver is exposing an rpmsg service).
|
||||
*/
|
||||
static int rpmsg_dev_probe(struct device *dev)
|
||||
{
|
||||
struct rpmsg_device *rpdev = to_rpmsg_device(dev);
|
||||
struct rpmsg_driver *rpdrv = to_rpmsg_driver(rpdev->dev.driver);
|
||||
struct rpmsg_channel_info chinfo = {};
|
||||
struct rpmsg_endpoint *ept;
|
||||
int err;
|
||||
|
||||
strncpy(chinfo.name, rpdev->id.name, RPMSG_NAME_SIZE);
|
||||
chinfo.src = rpdev->src;
|
||||
chinfo.dst = RPMSG_ADDR_ANY;
|
||||
|
||||
ept = rpmsg_create_ept(rpdev, rpdrv->callback, NULL, chinfo);
|
||||
if (!ept) {
|
||||
dev_err(dev, "failed to create endpoint\n");
|
||||
err = -ENOMEM;
|
||||
goto out;
|
||||
}
|
||||
|
||||
rpdev->ept = ept;
|
||||
rpdev->src = ept->addr;
|
||||
|
||||
err = rpdrv->probe(rpdev);
|
||||
if (err) {
|
||||
dev_err(dev, "%s: failed: %d\n", __func__, err);
|
||||
rpmsg_destroy_ept(ept);
|
||||
goto out;
|
||||
}
|
||||
|
||||
if (rpdev->ops->announce_create)
|
||||
err = rpdev->ops->announce_create(rpdev);
|
||||
out:
|
||||
return err;
|
||||
}
|
||||
|
||||
static int rpmsg_dev_remove(struct device *dev)
|
||||
{
|
||||
struct rpmsg_device *rpdev = to_rpmsg_device(dev);
|
||||
struct rpmsg_driver *rpdrv = to_rpmsg_driver(rpdev->dev.driver);
|
||||
int err = 0;
|
||||
|
||||
if (rpdev->ops->announce_destroy)
|
||||
err = rpdev->ops->announce_destroy(rpdev);
|
||||
|
||||
rpdrv->remove(rpdev);
|
||||
|
||||
rpmsg_destroy_ept(rpdev->ept);
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
static struct bus_type rpmsg_bus = {
|
||||
.name = "rpmsg",
|
||||
.match = rpmsg_dev_match,
|
||||
.dev_attrs = rpmsg_dev_attrs,
|
||||
.uevent = rpmsg_uevent,
|
||||
.probe = rpmsg_dev_probe,
|
||||
.remove = rpmsg_dev_remove,
|
||||
};
|
||||
|
||||
static void rpmsg_release_device(struct device *dev)
|
||||
{
|
||||
struct rpmsg_device *rpdev = to_rpmsg_device(dev);
|
||||
|
||||
kfree(rpdev);
|
||||
}
|
||||
|
||||
int rpmsg_register_device(struct rpmsg_device *rpdev)
|
||||
{
|
||||
struct device *dev = &rpdev->dev;
|
||||
int ret;
|
||||
|
||||
dev_set_name(&rpdev->dev, "%s:%s",
|
||||
dev_name(dev->parent), rpdev->id.name);
|
||||
|
||||
rpdev->dev.bus = &rpmsg_bus;
|
||||
rpdev->dev.release = rpmsg_release_device;
|
||||
|
||||
ret = device_register(&rpdev->dev);
|
||||
if (ret) {
|
||||
dev_err(dev, "device_register failed: %d\n", ret);
|
||||
put_device(&rpdev->dev);
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
EXPORT_SYMBOL(rpmsg_register_device);
|
||||
|
||||
/*
|
||||
* find an existing channel using its name + address properties,
|
||||
* and destroy it
|
||||
*/
|
||||
int rpmsg_unregister_device(struct device *parent,
|
||||
struct rpmsg_channel_info *chinfo)
|
||||
{
|
||||
struct device *dev;
|
||||
|
||||
dev = rpmsg_find_device(parent, chinfo);
|
||||
if (!dev)
|
||||
return -EINVAL;
|
||||
|
||||
device_unregister(dev);
|
||||
|
||||
put_device(dev);
|
||||
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL(rpmsg_unregister_device);
|
||||
|
||||
/**
|
||||
* __register_rpmsg_driver() - register an rpmsg driver with the rpmsg bus
|
||||
* @rpdrv: pointer to a struct rpmsg_driver
|
||||
* @owner: owning module/driver
|
||||
*
|
||||
* Returns 0 on success, and an appropriate error value on failure.
|
||||
*/
|
||||
int __register_rpmsg_driver(struct rpmsg_driver *rpdrv, struct module *owner)
|
||||
{
|
||||
rpdrv->drv.bus = &rpmsg_bus;
|
||||
rpdrv->drv.owner = owner;
|
||||
return driver_register(&rpdrv->drv);
|
||||
}
|
||||
EXPORT_SYMBOL(__register_rpmsg_driver);
|
||||
|
||||
/**
|
||||
* unregister_rpmsg_driver() - unregister an rpmsg driver from the rpmsg bus
|
||||
* @rpdrv: pointer to a struct rpmsg_driver
|
||||
*
|
||||
* Returns 0 on success, and an appropriate error value on failure.
|
||||
*/
|
||||
void unregister_rpmsg_driver(struct rpmsg_driver *rpdrv)
|
||||
{
|
||||
driver_unregister(&rpdrv->drv);
|
||||
}
|
||||
EXPORT_SYMBOL(unregister_rpmsg_driver);
|
||||
|
||||
|
||||
static int __init rpmsg_init(void)
|
||||
{
|
||||
int ret;
|
||||
|
||||
ret = bus_register(&rpmsg_bus);
|
||||
if (ret)
|
||||
pr_err("failed to register rpmsg bus: %d\n", ret);
|
||||
|
||||
return ret;
|
||||
}
|
||||
postcore_initcall(rpmsg_init);
|
||||
|
||||
static void __exit rpmsg_fini(void)
|
||||
{
|
||||
bus_unregister(&rpmsg_bus);
|
||||
}
|
||||
module_exit(rpmsg_fini);
|
||||
|
||||
MODULE_DESCRIPTION("remote processor messaging bus");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
|
|
@ -0,0 +1,82 @@
|
|||
/*
|
||||
* remote processor messaging bus internals
|
||||
*
|
||||
* Copyright (C) 2011 Texas Instruments, Inc.
|
||||
* Copyright (C) 2011 Google, Inc.
|
||||
*
|
||||
* Ohad Ben-Cohen <ohad@wizery.com>
|
||||
* Brian Swetland <swetland@google.com>
|
||||
*
|
||||
* This software is licensed under the terms of the GNU General Public
|
||||
* License version 2, as published by the Free Software Foundation, and
|
||||
* may be copied, distributed, and modified under those terms.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*/
|
||||
|
||||
#ifndef __RPMSG_INTERNAL_H__
|
||||
#define __RPMSG_INTERNAL_H__
|
||||
|
||||
#include <linux/rpmsg.h>
|
||||
|
||||
#define to_rpmsg_device(d) container_of(d, struct rpmsg_device, dev)
|
||||
#define to_rpmsg_driver(d) container_of(d, struct rpmsg_driver, drv)
|
||||
|
||||
/**
|
||||
* struct rpmsg_device_ops - indirection table for the rpmsg_device operations
|
||||
* @create_ept: create backend-specific endpoint, requried
|
||||
* @announce_create: announce presence of new channel, optional
|
||||
* @announce_destroy: announce destruction of channel, optional
|
||||
*
|
||||
* Indirection table for the operations that a rpmsg backend should implement.
|
||||
* @announce_create and @announce_destroy are optional as the backend might
|
||||
* advertise new channels implicitly by creating the endpoints.
|
||||
*/
|
||||
struct rpmsg_device_ops {
|
||||
struct rpmsg_endpoint *(*create_ept)(struct rpmsg_device *rpdev,
|
||||
rpmsg_rx_cb_t cb, void *priv,
|
||||
struct rpmsg_channel_info chinfo);
|
||||
|
||||
int (*announce_create)(struct rpmsg_device *ept);
|
||||
int (*announce_destroy)(struct rpmsg_device *ept);
|
||||
};
|
||||
|
||||
/**
|
||||
* struct rpmsg_endpoint_ops - indirection table for rpmsg_endpoint operations
|
||||
* @destroy_ept: destroy the given endpoint, required
|
||||
* @send: see @rpmsg_send(), required
|
||||
* @sendto: see @rpmsg_sendto(), optional
|
||||
* @send_offchannel: see @rpmsg_send_offchannel(), optional
|
||||
* @trysend: see @rpmsg_trysend(), required
|
||||
* @trysendto: see @rpmsg_trysendto(), optional
|
||||
* @trysend_offchannel: see @rpmsg_trysend_offchannel(), 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
|
||||
* @trysend, while the variants sending data off-channel are optional.
|
||||
*/
|
||||
struct rpmsg_endpoint_ops {
|
||||
void (*destroy_ept)(struct rpmsg_endpoint *ept);
|
||||
|
||||
int (*send)(struct rpmsg_endpoint *ept, void *data, int len);
|
||||
int (*sendto)(struct rpmsg_endpoint *ept, void *data, int len, u32 dst);
|
||||
int (*send_offchannel)(struct rpmsg_endpoint *ept, u32 src, u32 dst,
|
||||
void *data, int len);
|
||||
|
||||
int (*trysend)(struct rpmsg_endpoint *ept, void *data, int len);
|
||||
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);
|
||||
};
|
||||
|
||||
int rpmsg_register_device(struct rpmsg_device *rpdev);
|
||||
int rpmsg_unregister_device(struct device *parent,
|
||||
struct rpmsg_channel_info *chinfo);
|
||||
|
||||
struct device *rpmsg_find_device(struct device *parent,
|
||||
struct rpmsg_channel_info *chinfo);
|
||||
|
||||
#endif
|
||||
|
|
@ -33,6 +33,9 @@
|
|||
#include <linux/wait.h>
|
||||
#include <linux/rpmsg.h>
|
||||
#include <linux/mutex.h>
|
||||
#include <linux/of_device.h>
|
||||
|
||||
#include "rpmsg_internal.h"
|
||||
|
||||
/**
|
||||
* struct virtproc_info - virtual remote processor state
|
||||
|
|
@ -72,20 +75,69 @@ struct virtproc_info {
|
|||
struct rpmsg_endpoint *ns_ept;
|
||||
};
|
||||
|
||||
/* The feature bitmap for virtio rpmsg */
|
||||
#define VIRTIO_RPMSG_F_NS 0 /* RP supports name service notifications */
|
||||
|
||||
/**
|
||||
* struct rpmsg_channel_info - internal channel info representation
|
||||
* @name: name of service
|
||||
* @src: local address
|
||||
* struct rpmsg_hdr - common header for all rpmsg messages
|
||||
* @src: source address
|
||||
* @dst: destination address
|
||||
* @reserved: reserved for future use
|
||||
* @len: length of payload (in bytes)
|
||||
* @flags: message flags
|
||||
* @data: @len bytes of message payload data
|
||||
*
|
||||
* Every message sent(/received) on the rpmsg bus begins with this header.
|
||||
*/
|
||||
struct rpmsg_channel_info {
|
||||
char name[RPMSG_NAME_SIZE];
|
||||
struct rpmsg_hdr {
|
||||
u32 src;
|
||||
u32 dst;
|
||||
u32 reserved;
|
||||
u16 len;
|
||||
u16 flags;
|
||||
u8 data[0];
|
||||
} __packed;
|
||||
|
||||
/**
|
||||
* struct rpmsg_ns_msg - dynamic name service announcement message
|
||||
* @name: name of remote service that is published
|
||||
* @addr: address of remote service that is published
|
||||
* @flags: indicates whether service is created or destroyed
|
||||
*
|
||||
* This message is sent across to publish a new service, or announce
|
||||
* about its removal. When we receive these messages, an appropriate
|
||||
* rpmsg channel (i.e device) is created/destroyed. In turn, the ->probe()
|
||||
* or ->remove() handler of the appropriate rpmsg driver will be invoked
|
||||
* (if/as-soon-as one is registered).
|
||||
*/
|
||||
struct rpmsg_ns_msg {
|
||||
char name[RPMSG_NAME_SIZE];
|
||||
u32 addr;
|
||||
u32 flags;
|
||||
} __packed;
|
||||
|
||||
/**
|
||||
* enum rpmsg_ns_flags - dynamic name service announcement flags
|
||||
*
|
||||
* @RPMSG_NS_CREATE: a new remote service was just created
|
||||
* @RPMSG_NS_DESTROY: a known remote service was just destroyed
|
||||
*/
|
||||
enum rpmsg_ns_flags {
|
||||
RPMSG_NS_CREATE = 0,
|
||||
RPMSG_NS_DESTROY = 1,
|
||||
};
|
||||
|
||||
#define to_rpmsg_channel(d) container_of(d, struct rpmsg_channel, dev)
|
||||
#define to_rpmsg_driver(d) container_of(d, struct rpmsg_driver, drv)
|
||||
/**
|
||||
* @vrp: the remote processor this channel belongs to
|
||||
*/
|
||||
struct virtio_rpmsg_channel {
|
||||
struct rpmsg_device rpdev;
|
||||
|
||||
struct virtproc_info *vrp;
|
||||
};
|
||||
|
||||
#define to_virtio_rpmsg_channel(_rpdev) \
|
||||
container_of(_rpdev, struct virtio_rpmsg_channel, rpdev)
|
||||
|
||||
/*
|
||||
* We're allocating buffers of 512 bytes each for communications. The
|
||||
|
|
@ -118,78 +170,28 @@ struct rpmsg_channel_info {
|
|||
/* Address 53 is reserved for advertising remote services */
|
||||
#define RPMSG_NS_ADDR (53)
|
||||
|
||||
/* sysfs show configuration fields */
|
||||
#define rpmsg_show_attr(field, path, format_string) \
|
||||
static ssize_t \
|
||||
field##_show(struct device *dev, \
|
||||
struct device_attribute *attr, char *buf) \
|
||||
{ \
|
||||
struct rpmsg_channel *rpdev = to_rpmsg_channel(dev); \
|
||||
\
|
||||
return sprintf(buf, format_string, rpdev->path); \
|
||||
}
|
||||
static void virtio_rpmsg_destroy_ept(struct rpmsg_endpoint *ept);
|
||||
static int virtio_rpmsg_send(struct rpmsg_endpoint *ept, void *data, int len);
|
||||
static int virtio_rpmsg_sendto(struct rpmsg_endpoint *ept, void *data, int len,
|
||||
u32 dst);
|
||||
static int virtio_rpmsg_send_offchannel(struct rpmsg_endpoint *ept, u32 src,
|
||||
u32 dst, void *data, int len);
|
||||
static int virtio_rpmsg_trysend(struct rpmsg_endpoint *ept, void *data, int len);
|
||||
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);
|
||||
|
||||
/* for more info, see Documentation/ABI/testing/sysfs-bus-rpmsg */
|
||||
rpmsg_show_attr(name, id.name, "%s\n");
|
||||
rpmsg_show_attr(src, src, "0x%x\n");
|
||||
rpmsg_show_attr(dst, dst, "0x%x\n");
|
||||
rpmsg_show_attr(announce, announce ? "true" : "false", "%s\n");
|
||||
|
||||
/*
|
||||
* Unique (and free running) index for rpmsg devices.
|
||||
*
|
||||
* Yeah, we're not recycling those numbers (yet?). will be easy
|
||||
* to change if/when we want to.
|
||||
*/
|
||||
static unsigned int rpmsg_dev_index;
|
||||
|
||||
static ssize_t modalias_show(struct device *dev,
|
||||
struct device_attribute *attr, char *buf)
|
||||
{
|
||||
struct rpmsg_channel *rpdev = to_rpmsg_channel(dev);
|
||||
|
||||
return sprintf(buf, RPMSG_DEVICE_MODALIAS_FMT "\n", rpdev->id.name);
|
||||
}
|
||||
|
||||
static struct device_attribute rpmsg_dev_attrs[] = {
|
||||
__ATTR_RO(name),
|
||||
__ATTR_RO(modalias),
|
||||
__ATTR_RO(dst),
|
||||
__ATTR_RO(src),
|
||||
__ATTR_RO(announce),
|
||||
__ATTR_NULL
|
||||
static const struct rpmsg_endpoint_ops virtio_endpoint_ops = {
|
||||
.destroy_ept = virtio_rpmsg_destroy_ept,
|
||||
.send = virtio_rpmsg_send,
|
||||
.sendto = virtio_rpmsg_sendto,
|
||||
.send_offchannel = virtio_rpmsg_send_offchannel,
|
||||
.trysend = virtio_rpmsg_trysend,
|
||||
.trysendto = virtio_rpmsg_trysendto,
|
||||
.trysend_offchannel = virtio_rpmsg_trysend_offchannel,
|
||||
};
|
||||
|
||||
/* rpmsg devices and drivers are matched using the service name */
|
||||
static inline int rpmsg_id_match(const struct rpmsg_channel *rpdev,
|
||||
const struct rpmsg_device_id *id)
|
||||
{
|
||||
return strncmp(id->name, rpdev->id.name, RPMSG_NAME_SIZE) == 0;
|
||||
}
|
||||
|
||||
/* match rpmsg channel and rpmsg driver */
|
||||
static int rpmsg_dev_match(struct device *dev, struct device_driver *drv)
|
||||
{
|
||||
struct rpmsg_channel *rpdev = to_rpmsg_channel(dev);
|
||||
struct rpmsg_driver *rpdrv = to_rpmsg_driver(drv);
|
||||
const struct rpmsg_device_id *ids = rpdrv->id_table;
|
||||
unsigned int i;
|
||||
|
||||
for (i = 0; ids[i].name[0]; i++)
|
||||
if (rpmsg_id_match(rpdev, &ids[i]))
|
||||
return 1;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int rpmsg_uevent(struct device *dev, struct kobj_uevent_env *env)
|
||||
{
|
||||
struct rpmsg_channel *rpdev = to_rpmsg_channel(dev);
|
||||
|
||||
return add_uevent_var(env, "MODALIAS=" RPMSG_DEVICE_MODALIAS_FMT,
|
||||
rpdev->id.name);
|
||||
}
|
||||
|
||||
/**
|
||||
* __ept_release() - deallocate an rpmsg endpoint
|
||||
* @kref: the ept's reference count
|
||||
|
|
@ -212,18 +214,17 @@ static void __ept_release(struct kref *kref)
|
|||
|
||||
/* for more info, see below documentation of rpmsg_create_ept() */
|
||||
static struct rpmsg_endpoint *__rpmsg_create_ept(struct virtproc_info *vrp,
|
||||
struct rpmsg_channel *rpdev, rpmsg_rx_cb_t cb,
|
||||
void *priv, u32 addr)
|
||||
struct rpmsg_device *rpdev,
|
||||
rpmsg_rx_cb_t cb,
|
||||
void *priv, u32 addr)
|
||||
{
|
||||
int id_min, id_max, id;
|
||||
struct rpmsg_endpoint *ept;
|
||||
struct device *dev = rpdev ? &rpdev->dev : &vrp->vdev->dev;
|
||||
|
||||
ept = kzalloc(sizeof(*ept), GFP_KERNEL);
|
||||
if (!ept) {
|
||||
dev_err(dev, "failed to kzalloc a new ept\n");
|
||||
if (!ept)
|
||||
return NULL;
|
||||
}
|
||||
|
||||
kref_init(&ept->refcount);
|
||||
mutex_init(&ept->cb_lock);
|
||||
|
|
@ -231,6 +232,7 @@ static struct rpmsg_endpoint *__rpmsg_create_ept(struct virtproc_info *vrp,
|
|||
ept->rpdev = rpdev;
|
||||
ept->cb = cb;
|
||||
ept->priv = priv;
|
||||
ept->ops = &virtio_endpoint_ops;
|
||||
|
||||
/* do we need to allocate a local address ? */
|
||||
if (addr == RPMSG_ADDR_ANY) {
|
||||
|
|
@ -261,52 +263,15 @@ free_ept:
|
|||
return NULL;
|
||||
}
|
||||
|
||||
/**
|
||||
* rpmsg_create_ept() - create a new rpmsg_endpoint
|
||||
* @rpdev: rpmsg channel device
|
||||
* @cb: rx callback handler
|
||||
* @priv: private data for the driver's use
|
||||
* @addr: local rpmsg address to bind with @cb
|
||||
*
|
||||
* Every rpmsg address in the system is bound to an rx callback (so when
|
||||
* inbound messages arrive, they are dispatched by the rpmsg bus using the
|
||||
* appropriate callback handler) by means of an rpmsg_endpoint struct.
|
||||
*
|
||||
* This function allows drivers to create such an endpoint, and by that,
|
||||
* bind a callback, and possibly some private data too, to an rpmsg address
|
||||
* (either one that is known in advance, or one that will be dynamically
|
||||
* assigned for them).
|
||||
*
|
||||
* Simple rpmsg drivers need not call rpmsg_create_ept, because an endpoint
|
||||
* is already created for them when they are probed by the rpmsg bus
|
||||
* (using the rx callback provided when they registered to the rpmsg bus).
|
||||
*
|
||||
* So things should just work for simple drivers: they already have an
|
||||
* endpoint, their rx callback is bound to their rpmsg address, and when
|
||||
* relevant inbound messages arrive (i.e. messages which their dst address
|
||||
* equals to the src address of their rpmsg channel), the driver's handler
|
||||
* is invoked to process it.
|
||||
*
|
||||
* That said, more complicated drivers might do need to allocate
|
||||
* additional rpmsg addresses, and bind them to different rx callbacks.
|
||||
* To accomplish that, those drivers need to call this function.
|
||||
*
|
||||
* Drivers should provide their @rpdev channel (so the new endpoint would belong
|
||||
* to the same remote processor their channel belongs to), an rx callback
|
||||
* function, an optional private data (which is provided back when the
|
||||
* rx callback is invoked), and an address they want to bind with the
|
||||
* callback. If @addr is RPMSG_ADDR_ANY, then rpmsg_create_ept will
|
||||
* dynamically assign them an available rpmsg address (drivers should have
|
||||
* a very good reason why not to always use RPMSG_ADDR_ANY here).
|
||||
*
|
||||
* Returns a pointer to the endpoint on success, or NULL on error.
|
||||
*/
|
||||
struct rpmsg_endpoint *rpmsg_create_ept(struct rpmsg_channel *rpdev,
|
||||
rpmsg_rx_cb_t cb, void *priv, u32 addr)
|
||||
static struct rpmsg_endpoint *virtio_rpmsg_create_ept(struct rpmsg_device *rpdev,
|
||||
rpmsg_rx_cb_t cb,
|
||||
void *priv,
|
||||
struct rpmsg_channel_info chinfo)
|
||||
{
|
||||
return __rpmsg_create_ept(rpdev->vrp, rpdev, cb, priv, addr);
|
||||
struct virtio_rpmsg_channel *vch = to_virtio_rpmsg_channel(rpdev);
|
||||
|
||||
return __rpmsg_create_ept(vch->vrp, rpdev, cb, priv, chinfo.src);
|
||||
}
|
||||
EXPORT_SYMBOL(rpmsg_create_ept);
|
||||
|
||||
/**
|
||||
* __rpmsg_destroy_ept() - destroy an existing rpmsg endpoint
|
||||
|
|
@ -334,178 +299,82 @@ __rpmsg_destroy_ept(struct virtproc_info *vrp, struct rpmsg_endpoint *ept)
|
|||
kref_put(&ept->refcount, __ept_release);
|
||||
}
|
||||
|
||||
/**
|
||||
* rpmsg_destroy_ept() - destroy an existing rpmsg endpoint
|
||||
* @ept: endpoing to destroy
|
||||
*
|
||||
* Should be used by drivers to destroy an rpmsg endpoint previously
|
||||
* created with rpmsg_create_ept().
|
||||
*/
|
||||
void rpmsg_destroy_ept(struct rpmsg_endpoint *ept)
|
||||
static void virtio_rpmsg_destroy_ept(struct rpmsg_endpoint *ept)
|
||||
{
|
||||
__rpmsg_destroy_ept(ept->rpdev->vrp, ept);
|
||||
struct virtio_rpmsg_channel *vch = to_virtio_rpmsg_channel(ept->rpdev);
|
||||
|
||||
__rpmsg_destroy_ept(vch->vrp, ept);
|
||||
}
|
||||
EXPORT_SYMBOL(rpmsg_destroy_ept);
|
||||
|
||||
/*
|
||||
* when an rpmsg driver is probed with a channel, we seamlessly create
|
||||
* it an endpoint, binding its rx callback to a unique local rpmsg
|
||||
* address.
|
||||
*
|
||||
* if we need to, we also announce about this channel to the remote
|
||||
* processor (needed in case the driver is exposing an rpmsg service).
|
||||
*/
|
||||
static int rpmsg_dev_probe(struct device *dev)
|
||||
static int virtio_rpmsg_announce_create(struct rpmsg_device *rpdev)
|
||||
{
|
||||
struct rpmsg_channel *rpdev = to_rpmsg_channel(dev);
|
||||
struct rpmsg_driver *rpdrv = to_rpmsg_driver(rpdev->dev.driver);
|
||||
struct virtproc_info *vrp = rpdev->vrp;
|
||||
struct rpmsg_endpoint *ept;
|
||||
int err;
|
||||
|
||||
ept = rpmsg_create_ept(rpdev, rpdrv->callback, NULL, rpdev->src);
|
||||
if (!ept) {
|
||||
dev_err(dev, "failed to create endpoint\n");
|
||||
err = -ENOMEM;
|
||||
goto out;
|
||||
}
|
||||
|
||||
rpdev->ept = ept;
|
||||
rpdev->src = ept->addr;
|
||||
|
||||
err = rpdrv->probe(rpdev);
|
||||
if (err) {
|
||||
dev_err(dev, "%s: failed: %d\n", __func__, err);
|
||||
rpmsg_destroy_ept(ept);
|
||||
goto out;
|
||||
}
|
||||
struct virtio_rpmsg_channel *vch = to_virtio_rpmsg_channel(rpdev);
|
||||
struct virtproc_info *vrp = vch->vrp;
|
||||
struct device *dev = &rpdev->dev;
|
||||
int err = 0;
|
||||
|
||||
/* need to tell remote processor's name service about this channel ? */
|
||||
if (rpdev->announce &&
|
||||
virtio_has_feature(vrp->vdev, VIRTIO_RPMSG_F_NS)) {
|
||||
virtio_has_feature(vrp->vdev, VIRTIO_RPMSG_F_NS)) {
|
||||
struct rpmsg_ns_msg nsm;
|
||||
|
||||
strncpy(nsm.name, rpdev->id.name, RPMSG_NAME_SIZE);
|
||||
nsm.addr = rpdev->src;
|
||||
nsm.addr = rpdev->ept->addr;
|
||||
nsm.flags = RPMSG_NS_CREATE;
|
||||
|
||||
err = rpmsg_sendto(rpdev, &nsm, sizeof(nsm), RPMSG_NS_ADDR);
|
||||
err = rpmsg_sendto(rpdev->ept, &nsm, sizeof(nsm), RPMSG_NS_ADDR);
|
||||
if (err)
|
||||
dev_err(dev, "failed to announce service %d\n", err);
|
||||
}
|
||||
|
||||
out:
|
||||
return err;
|
||||
}
|
||||
|
||||
static int rpmsg_dev_remove(struct device *dev)
|
||||
static int virtio_rpmsg_announce_destroy(struct rpmsg_device *rpdev)
|
||||
{
|
||||
struct rpmsg_channel *rpdev = to_rpmsg_channel(dev);
|
||||
struct rpmsg_driver *rpdrv = to_rpmsg_driver(rpdev->dev.driver);
|
||||
struct virtproc_info *vrp = rpdev->vrp;
|
||||
struct virtio_rpmsg_channel *vch = to_virtio_rpmsg_channel(rpdev);
|
||||
struct virtproc_info *vrp = vch->vrp;
|
||||
struct device *dev = &rpdev->dev;
|
||||
int err = 0;
|
||||
|
||||
/* tell remote processor's name service we're removing this channel */
|
||||
if (rpdev->announce &&
|
||||
virtio_has_feature(vrp->vdev, VIRTIO_RPMSG_F_NS)) {
|
||||
virtio_has_feature(vrp->vdev, VIRTIO_RPMSG_F_NS)) {
|
||||
struct rpmsg_ns_msg nsm;
|
||||
|
||||
strncpy(nsm.name, rpdev->id.name, RPMSG_NAME_SIZE);
|
||||
nsm.addr = rpdev->src;
|
||||
nsm.flags = RPMSG_NS_DESTROY;
|
||||
|
||||
err = rpmsg_sendto(rpdev, &nsm, sizeof(nsm), RPMSG_NS_ADDR);
|
||||
err = rpmsg_sendto(rpdev->ept, &nsm, sizeof(nsm), RPMSG_NS_ADDR);
|
||||
if (err)
|
||||
dev_err(dev, "failed to announce service %d\n", err);
|
||||
}
|
||||
|
||||
rpdrv->remove(rpdev);
|
||||
|
||||
rpmsg_destroy_ept(rpdev->ept);
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
static struct bus_type rpmsg_bus = {
|
||||
.name = "rpmsg",
|
||||
.match = rpmsg_dev_match,
|
||||
.dev_attrs = rpmsg_dev_attrs,
|
||||
.uevent = rpmsg_uevent,
|
||||
.probe = rpmsg_dev_probe,
|
||||
.remove = rpmsg_dev_remove,
|
||||
static const struct rpmsg_device_ops virtio_rpmsg_ops = {
|
||||
.create_ept = virtio_rpmsg_create_ept,
|
||||
.announce_create = virtio_rpmsg_announce_create,
|
||||
.announce_destroy = virtio_rpmsg_announce_destroy,
|
||||
};
|
||||
|
||||
/**
|
||||
* __register_rpmsg_driver() - register an rpmsg driver with the rpmsg bus
|
||||
* @rpdrv: pointer to a struct rpmsg_driver
|
||||
* @owner: owning module/driver
|
||||
*
|
||||
* Returns 0 on success, and an appropriate error value on failure.
|
||||
*/
|
||||
int __register_rpmsg_driver(struct rpmsg_driver *rpdrv, struct module *owner)
|
||||
{
|
||||
rpdrv->drv.bus = &rpmsg_bus;
|
||||
rpdrv->drv.owner = owner;
|
||||
return driver_register(&rpdrv->drv);
|
||||
}
|
||||
EXPORT_SYMBOL(__register_rpmsg_driver);
|
||||
|
||||
/**
|
||||
* unregister_rpmsg_driver() - unregister an rpmsg driver from the rpmsg bus
|
||||
* @rpdrv: pointer to a struct rpmsg_driver
|
||||
*
|
||||
* Returns 0 on success, and an appropriate error value on failure.
|
||||
*/
|
||||
void unregister_rpmsg_driver(struct rpmsg_driver *rpdrv)
|
||||
{
|
||||
driver_unregister(&rpdrv->drv);
|
||||
}
|
||||
EXPORT_SYMBOL(unregister_rpmsg_driver);
|
||||
|
||||
static void rpmsg_release_device(struct device *dev)
|
||||
{
|
||||
struct rpmsg_channel *rpdev = to_rpmsg_channel(dev);
|
||||
|
||||
kfree(rpdev);
|
||||
}
|
||||
|
||||
/*
|
||||
* match an rpmsg channel with a channel info struct.
|
||||
* this is used to make sure we're not creating rpmsg devices for channels
|
||||
* that already exist.
|
||||
*/
|
||||
static int rpmsg_channel_match(struct device *dev, void *data)
|
||||
{
|
||||
struct rpmsg_channel_info *chinfo = data;
|
||||
struct rpmsg_channel *rpdev = to_rpmsg_channel(dev);
|
||||
|
||||
if (chinfo->src != RPMSG_ADDR_ANY && chinfo->src != rpdev->src)
|
||||
return 0;
|
||||
|
||||
if (chinfo->dst != RPMSG_ADDR_ANY && chinfo->dst != rpdev->dst)
|
||||
return 0;
|
||||
|
||||
if (strncmp(chinfo->name, rpdev->id.name, RPMSG_NAME_SIZE))
|
||||
return 0;
|
||||
|
||||
/* found a match ! */
|
||||
return 1;
|
||||
}
|
||||
|
||||
/*
|
||||
* create an rpmsg channel using its name and address info.
|
||||
* this function will be used to create both static and dynamic
|
||||
* channels.
|
||||
*/
|
||||
static struct rpmsg_channel *rpmsg_create_channel(struct virtproc_info *vrp,
|
||||
struct rpmsg_channel_info *chinfo)
|
||||
static struct rpmsg_device *rpmsg_create_channel(struct virtproc_info *vrp,
|
||||
struct rpmsg_channel_info *chinfo)
|
||||
{
|
||||
struct rpmsg_channel *rpdev;
|
||||
struct virtio_rpmsg_channel *vch;
|
||||
struct rpmsg_device *rpdev;
|
||||
struct device *tmp, *dev = &vrp->vdev->dev;
|
||||
int ret;
|
||||
|
||||
/* make sure a similar channel doesn't already exist */
|
||||
tmp = device_find_child(dev, chinfo, rpmsg_channel_match);
|
||||
tmp = rpmsg_find_device(dev, chinfo);
|
||||
if (tmp) {
|
||||
/* decrement the matched device's refcount back */
|
||||
put_device(tmp);
|
||||
|
|
@ -514,62 +383,38 @@ static struct rpmsg_channel *rpmsg_create_channel(struct virtproc_info *vrp,
|
|||
return NULL;
|
||||
}
|
||||
|
||||
rpdev = kzalloc(sizeof(struct rpmsg_channel), GFP_KERNEL);
|
||||
if (!rpdev) {
|
||||
pr_err("kzalloc failed\n");
|
||||
vch = kzalloc(sizeof(*vch), GFP_KERNEL);
|
||||
if (!vch)
|
||||
return NULL;
|
||||
}
|
||||
|
||||
rpdev->vrp = vrp;
|
||||
/* Link the channel to our vrp */
|
||||
vch->vrp = vrp;
|
||||
|
||||
/* Assign callbacks for rpmsg_channel */
|
||||
vch->rpdev.ops = &virtio_rpmsg_ops;
|
||||
|
||||
/* Assign public information to the rpmsg_device */
|
||||
rpdev = &vch->rpdev;
|
||||
rpdev->src = chinfo->src;
|
||||
rpdev->dst = chinfo->dst;
|
||||
rpdev->ops = &virtio_rpmsg_ops;
|
||||
|
||||
/*
|
||||
* rpmsg server channels has predefined local address (for now),
|
||||
* and their existence needs to be announced remotely
|
||||
*/
|
||||
rpdev->announce = rpdev->src != RPMSG_ADDR_ANY ? true : false;
|
||||
rpdev->announce = rpdev->src != RPMSG_ADDR_ANY;
|
||||
|
||||
strncpy(rpdev->id.name, chinfo->name, RPMSG_NAME_SIZE);
|
||||
|
||||
/* very simple device indexing plumbing which is enough for now */
|
||||
dev_set_name(&rpdev->dev, "rpmsg%d", rpmsg_dev_index++);
|
||||
|
||||
rpdev->dev.parent = &vrp->vdev->dev;
|
||||
rpdev->dev.bus = &rpmsg_bus;
|
||||
rpdev->dev.release = rpmsg_release_device;
|
||||
|
||||
ret = device_register(&rpdev->dev);
|
||||
if (ret) {
|
||||
dev_err(dev, "device_register failed: %d\n", ret);
|
||||
put_device(&rpdev->dev);
|
||||
ret = rpmsg_register_device(rpdev);
|
||||
if (ret)
|
||||
return NULL;
|
||||
}
|
||||
|
||||
return rpdev;
|
||||
}
|
||||
|
||||
/*
|
||||
* find an existing channel using its name + address properties,
|
||||
* and destroy it
|
||||
*/
|
||||
static int rpmsg_destroy_channel(struct virtproc_info *vrp,
|
||||
struct rpmsg_channel_info *chinfo)
|
||||
{
|
||||
struct virtio_device *vdev = vrp->vdev;
|
||||
struct device *dev;
|
||||
|
||||
dev = device_find_child(&vdev->dev, chinfo, rpmsg_channel_match);
|
||||
if (!dev)
|
||||
return -EINVAL;
|
||||
|
||||
device_unregister(dev);
|
||||
|
||||
put_device(dev);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* super simple buffer "allocator" that is just enough for now */
|
||||
static void *get_a_tx_buf(struct virtproc_info *vrp)
|
||||
{
|
||||
|
|
@ -684,10 +529,12 @@ static void rpmsg_downref_sleepers(struct virtproc_info *vrp)
|
|||
*
|
||||
* Returns 0 on success and an appropriate error value on failure.
|
||||
*/
|
||||
int rpmsg_send_offchannel_raw(struct rpmsg_channel *rpdev, u32 src, u32 dst,
|
||||
void *data, int len, bool wait)
|
||||
static int rpmsg_send_offchannel_raw(struct rpmsg_device *rpdev,
|
||||
u32 src, u32 dst,
|
||||
void *data, int len, bool wait)
|
||||
{
|
||||
struct virtproc_info *vrp = rpdev->vrp;
|
||||
struct virtio_rpmsg_channel *vch = to_virtio_rpmsg_channel(rpdev);
|
||||
struct virtproc_info *vrp = vch->vrp;
|
||||
struct device *dev = &rpdev->dev;
|
||||
struct scatterlist sg;
|
||||
struct rpmsg_hdr *msg;
|
||||
|
|
@ -751,10 +598,11 @@ int rpmsg_send_offchannel_raw(struct rpmsg_channel *rpdev, u32 src, u32 dst,
|
|||
memcpy(msg->data, data, len);
|
||||
|
||||
dev_dbg(dev, "TX From 0x%x, To 0x%x, Len %d, Flags %d, Reserved %d\n",
|
||||
msg->src, msg->dst, msg->len,
|
||||
msg->flags, msg->reserved);
|
||||
print_hex_dump(KERN_DEBUG, "rpmsg_virtio TX: ", DUMP_PREFIX_NONE, 16, 1,
|
||||
msg, sizeof(*msg) + msg->len, true);
|
||||
msg->src, msg->dst, msg->len, msg->flags, msg->reserved);
|
||||
#if defined(CONFIG_DYNAMIC_DEBUG)
|
||||
dynamic_hex_dump("rpmsg_virtio TX: ", DUMP_PREFIX_NONE, 16, 1,
|
||||
msg, sizeof(*msg) + msg->len, true);
|
||||
#endif
|
||||
|
||||
sg_init_one(&sg, msg, sizeof(*msg) + len);
|
||||
|
||||
|
|
@ -780,6 +628,56 @@ out:
|
|||
}
|
||||
EXPORT_SYMBOL(rpmsg_send_offchannel_raw);
|
||||
|
||||
static int virtio_rpmsg_send(struct rpmsg_endpoint *ept, void *data, int len)
|
||||
{
|
||||
struct rpmsg_device *rpdev = ept->rpdev;
|
||||
u32 src = ept->addr, dst = rpdev->dst;
|
||||
|
||||
return rpmsg_send_offchannel_raw(rpdev, src, dst, data, len, true);
|
||||
}
|
||||
|
||||
static int virtio_rpmsg_sendto(struct rpmsg_endpoint *ept, void *data, int len,
|
||||
u32 dst)
|
||||
{
|
||||
struct rpmsg_device *rpdev = ept->rpdev;
|
||||
u32 src = ept->addr;
|
||||
|
||||
return rpmsg_send_offchannel_raw(rpdev, src, dst, data, len, true);
|
||||
}
|
||||
|
||||
static int virtio_rpmsg_send_offchannel(struct rpmsg_endpoint *ept, u32 src,
|
||||
u32 dst, void *data, int len)
|
||||
{
|
||||
struct rpmsg_device *rpdev = ept->rpdev;
|
||||
|
||||
return rpmsg_send_offchannel_raw(rpdev, src, dst, data, len, true);
|
||||
}
|
||||
|
||||
static int virtio_rpmsg_trysend(struct rpmsg_endpoint *ept, void *data, int len)
|
||||
{
|
||||
struct rpmsg_device *rpdev = ept->rpdev;
|
||||
u32 src = ept->addr, dst = rpdev->dst;
|
||||
|
||||
return rpmsg_send_offchannel_raw(rpdev, src, dst, data, len, false);
|
||||
}
|
||||
|
||||
static int virtio_rpmsg_trysendto(struct rpmsg_endpoint *ept, void *data,
|
||||
int len, u32 dst)
|
||||
{
|
||||
struct rpmsg_device *rpdev = ept->rpdev;
|
||||
u32 src = ept->addr;
|
||||
|
||||
return rpmsg_send_offchannel_raw(rpdev, src, dst, data, len, false);
|
||||
}
|
||||
|
||||
static int virtio_rpmsg_trysend_offchannel(struct rpmsg_endpoint *ept, u32 src,
|
||||
u32 dst, void *data, int len)
|
||||
{
|
||||
struct rpmsg_device *rpdev = ept->rpdev;
|
||||
|
||||
return rpmsg_send_offchannel_raw(rpdev, src, dst, data, len, false);
|
||||
}
|
||||
|
||||
static int rpmsg_recv_single(struct virtproc_info *vrp, struct device *dev,
|
||||
struct rpmsg_hdr *msg, unsigned int len)
|
||||
{
|
||||
|
|
@ -788,17 +686,18 @@ static int rpmsg_recv_single(struct virtproc_info *vrp, struct device *dev,
|
|||
int err;
|
||||
|
||||
dev_dbg(dev, "From: 0x%x, To: 0x%x, Len: %d, Flags: %d, Reserved: %d\n",
|
||||
msg->src, msg->dst, msg->len,
|
||||
msg->flags, msg->reserved);
|
||||
print_hex_dump(KERN_DEBUG, "rpmsg_virtio RX: ", DUMP_PREFIX_NONE, 16, 1,
|
||||
msg, sizeof(*msg) + msg->len, true);
|
||||
msg->src, msg->dst, msg->len, msg->flags, msg->reserved);
|
||||
#if defined(CONFIG_DYNAMIC_DEBUG)
|
||||
dynamic_hex_dump("rpmsg_virtio RX: ", DUMP_PREFIX_NONE, 16, 1,
|
||||
msg, sizeof(*msg) + msg->len, true);
|
||||
#endif
|
||||
|
||||
/*
|
||||
* We currently use fixed-sized buffers, so trivially sanitize
|
||||
* the reported payload length.
|
||||
*/
|
||||
if (len > RPMSG_BUF_SIZE ||
|
||||
msg->len > (len - sizeof(struct rpmsg_hdr))) {
|
||||
msg->len > (len - sizeof(struct rpmsg_hdr))) {
|
||||
dev_warn(dev, "inbound msg too big: (%d, %d)\n", len, msg->len);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
|
@ -865,7 +764,7 @@ static void rpmsg_recv_done(struct virtqueue *rvq)
|
|||
msgs_received++;
|
||||
|
||||
msg = virtqueue_get_buf(rvq, &len);
|
||||
};
|
||||
}
|
||||
|
||||
dev_dbg(dev, "Received %u messages\n", msgs_received);
|
||||
|
||||
|
|
@ -892,23 +791,24 @@ static void rpmsg_xmit_done(struct virtqueue *svq)
|
|||
}
|
||||
|
||||
/* invoked when a name service announcement arrives */
|
||||
static void rpmsg_ns_cb(struct rpmsg_channel *rpdev, void *data, int len,
|
||||
void *priv, u32 src)
|
||||
static int rpmsg_ns_cb(struct rpmsg_device *rpdev, void *data, int len,
|
||||
void *priv, u32 src)
|
||||
{
|
||||
struct rpmsg_ns_msg *msg = data;
|
||||
struct rpmsg_channel *newch;
|
||||
struct rpmsg_device *newch;
|
||||
struct rpmsg_channel_info chinfo;
|
||||
struct virtproc_info *vrp = priv;
|
||||
struct device *dev = &vrp->vdev->dev;
|
||||
int ret;
|
||||
|
||||
print_hex_dump(KERN_DEBUG, "NS announcement: ",
|
||||
DUMP_PREFIX_NONE, 16, 1,
|
||||
data, len, true);
|
||||
#if defined(CONFIG_DYNAMIC_DEBUG)
|
||||
dynamic_hex_dump("NS announcement: ", DUMP_PREFIX_NONE, 16, 1,
|
||||
data, len, true);
|
||||
#endif
|
||||
|
||||
if (len != sizeof(*msg)) {
|
||||
dev_err(dev, "malformed ns msg (%d)\n", len);
|
||||
return;
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
/*
|
||||
|
|
@ -919,22 +819,22 @@ static void rpmsg_ns_cb(struct rpmsg_channel *rpdev, void *data, int len,
|
|||
*/
|
||||
if (rpdev) {
|
||||
dev_err(dev, "anomaly: ns ept has an rpdev handle\n");
|
||||
return;
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
/* don't trust the remote processor for null terminating the name */
|
||||
msg->name[RPMSG_NAME_SIZE - 1] = '\0';
|
||||
|
||||
dev_info(dev, "%sing channel %s addr 0x%x\n",
|
||||
msg->flags & RPMSG_NS_DESTROY ? "destroy" : "creat",
|
||||
msg->name, msg->addr);
|
||||
msg->flags & RPMSG_NS_DESTROY ? "destroy" : "creat",
|
||||
msg->name, msg->addr);
|
||||
|
||||
strncpy(chinfo.name, msg->name, sizeof(chinfo.name));
|
||||
chinfo.src = RPMSG_ADDR_ANY;
|
||||
chinfo.dst = msg->addr;
|
||||
|
||||
if (msg->flags & RPMSG_NS_DESTROY) {
|
||||
ret = rpmsg_destroy_channel(vrp, &chinfo);
|
||||
ret = rpmsg_unregister_device(&vrp->vdev->dev, &chinfo);
|
||||
if (ret)
|
||||
dev_err(dev, "rpmsg_destroy_channel failed: %d\n", ret);
|
||||
} else {
|
||||
|
|
@ -942,6 +842,8 @@ static void rpmsg_ns_cb(struct rpmsg_channel *rpdev, void *data, int len,
|
|||
if (!newch)
|
||||
dev_err(dev, "rpmsg_create_channel failed\n");
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int rpmsg_probe(struct virtio_device *vdev)
|
||||
|
|
@ -995,8 +897,8 @@ static int rpmsg_probe(struct virtio_device *vdev)
|
|||
goto vqs_del;
|
||||
}
|
||||
|
||||
dev_dbg(&vdev->dev, "buffers: va %p, dma 0x%llx\n", bufs_va,
|
||||
(unsigned long long)vrp->bufs_dma);
|
||||
dev_dbg(&vdev->dev, "buffers: va %p, dma %pad\n",
|
||||
bufs_va, &vrp->bufs_dma);
|
||||
|
||||
/* half of the buffers is dedicated for RX */
|
||||
vrp->rbufs = bufs_va;
|
||||
|
|
@ -1012,7 +914,7 @@ static int rpmsg_probe(struct virtio_device *vdev)
|
|||
sg_init_one(&sg, cpu_addr, RPMSG_BUF_SIZE);
|
||||
|
||||
err = virtqueue_add_inbuf(vrp->rvq, &sg, 1, cpu_addr,
|
||||
GFP_KERNEL);
|
||||
GFP_KERNEL);
|
||||
WARN_ON(err); /* sanity check; this can't really happen */
|
||||
}
|
||||
|
||||
|
|
@ -1119,17 +1021,9 @@ static int __init rpmsg_init(void)
|
|||
{
|
||||
int ret;
|
||||
|
||||
ret = bus_register(&rpmsg_bus);
|
||||
if (ret) {
|
||||
pr_err("failed to register rpmsg bus: %d\n", ret);
|
||||
return ret;
|
||||
}
|
||||
|
||||
ret = register_virtio_driver(&virtio_ipc_driver);
|
||||
if (ret) {
|
||||
if (ret)
|
||||
pr_err("failed to register virtio driver: %d\n", ret);
|
||||
bus_unregister(&rpmsg_bus);
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
|
@ -1138,7 +1032,6 @@ subsys_initcall(rpmsg_init);
|
|||
static void __exit rpmsg_fini(void)
|
||||
{
|
||||
unregister_virtio_driver(&virtio_ipc_driver);
|
||||
bus_unregister(&rpmsg_bus);
|
||||
}
|
||||
module_exit(rpmsg_fini);
|
||||
|
||||
|
|
|
|||
|
|
@ -41,65 +41,27 @@
|
|||
#include <linux/kref.h>
|
||||
#include <linux/mutex.h>
|
||||
|
||||
/* The feature bitmap for virtio rpmsg */
|
||||
#define VIRTIO_RPMSG_F_NS 0 /* RP supports name service notifications */
|
||||
|
||||
/**
|
||||
* struct rpmsg_hdr - common header for all rpmsg messages
|
||||
* @src: source address
|
||||
* @dst: destination address
|
||||
* @reserved: reserved for future use
|
||||
* @len: length of payload (in bytes)
|
||||
* @flags: message flags
|
||||
* @data: @len bytes of message payload data
|
||||
*
|
||||
* Every message sent(/received) on the rpmsg bus begins with this header.
|
||||
*/
|
||||
struct rpmsg_hdr {
|
||||
u32 src;
|
||||
u32 dst;
|
||||
u32 reserved;
|
||||
u16 len;
|
||||
u16 flags;
|
||||
u8 data[0];
|
||||
} __packed;
|
||||
|
||||
/**
|
||||
* struct rpmsg_ns_msg - dynamic name service announcement message
|
||||
* @name: name of remote service that is published
|
||||
* @addr: address of remote service that is published
|
||||
* @flags: indicates whether service is created or destroyed
|
||||
*
|
||||
* This message is sent across to publish a new service, or announce
|
||||
* about its removal. When we receive these messages, an appropriate
|
||||
* rpmsg channel (i.e device) is created/destroyed. In turn, the ->probe()
|
||||
* or ->remove() handler of the appropriate rpmsg driver will be invoked
|
||||
* (if/as-soon-as one is registered).
|
||||
*/
|
||||
struct rpmsg_ns_msg {
|
||||
char name[RPMSG_NAME_SIZE];
|
||||
u32 addr;
|
||||
u32 flags;
|
||||
} __packed;
|
||||
|
||||
/**
|
||||
* enum rpmsg_ns_flags - dynamic name service announcement flags
|
||||
*
|
||||
* @RPMSG_NS_CREATE: a new remote service was just created
|
||||
* @RPMSG_NS_DESTROY: a known remote service was just destroyed
|
||||
*/
|
||||
enum rpmsg_ns_flags {
|
||||
RPMSG_NS_CREATE = 0,
|
||||
RPMSG_NS_DESTROY = 1,
|
||||
};
|
||||
|
||||
#define RPMSG_ADDR_ANY 0xFFFFFFFF
|
||||
|
||||
struct virtproc_info;
|
||||
struct rpmsg_device;
|
||||
struct rpmsg_endpoint;
|
||||
struct rpmsg_device_ops;
|
||||
struct rpmsg_endpoint_ops;
|
||||
|
||||
/**
|
||||
* rpmsg_channel - devices that belong to the rpmsg bus are called channels
|
||||
* @vrp: the remote processor this channel belongs to
|
||||
* struct rpmsg_channel_info - channel info representation
|
||||
* @name: name of service
|
||||
* @src: local address
|
||||
* @dst: destination address
|
||||
*/
|
||||
struct rpmsg_channel_info {
|
||||
char name[RPMSG_NAME_SIZE];
|
||||
u32 src;
|
||||
u32 dst;
|
||||
};
|
||||
|
||||
/**
|
||||
* rpmsg_device - device that belong to the rpmsg bus
|
||||
* @dev: the device struct
|
||||
* @id: device id (used to match between rpmsg drivers and devices)
|
||||
* @src: local address
|
||||
|
|
@ -107,17 +69,18 @@ struct virtproc_info;
|
|||
* @ept: the rpmsg endpoint of this channel
|
||||
* @announce: if set, rpmsg will announce the creation/removal of this channel
|
||||
*/
|
||||
struct rpmsg_channel {
|
||||
struct virtproc_info *vrp;
|
||||
struct rpmsg_device {
|
||||
struct device dev;
|
||||
struct rpmsg_device_id id;
|
||||
u32 src;
|
||||
u32 dst;
|
||||
struct rpmsg_endpoint *ept;
|
||||
bool announce;
|
||||
|
||||
const struct rpmsg_device_ops *ops;
|
||||
};
|
||||
|
||||
typedef void (*rpmsg_rx_cb_t)(struct rpmsg_channel *, void *, int, void *, u32);
|
||||
typedef int (*rpmsg_rx_cb_t)(struct rpmsg_device *, void *, int, void *, u32);
|
||||
|
||||
/**
|
||||
* struct rpmsg_endpoint - binds a local rpmsg address to its user
|
||||
|
|
@ -143,12 +106,14 @@ typedef void (*rpmsg_rx_cb_t)(struct rpmsg_channel *, void *, int, void *, u32);
|
|||
* create additional endpoints by themselves (see rpmsg_create_ept()).
|
||||
*/
|
||||
struct rpmsg_endpoint {
|
||||
struct rpmsg_channel *rpdev;
|
||||
struct rpmsg_device *rpdev;
|
||||
struct kref refcount;
|
||||
rpmsg_rx_cb_t cb;
|
||||
struct mutex cb_lock;
|
||||
u32 addr;
|
||||
void *priv;
|
||||
|
||||
const struct rpmsg_endpoint_ops *ops;
|
||||
};
|
||||
|
||||
/**
|
||||
|
|
@ -162,20 +127,19 @@ struct rpmsg_endpoint {
|
|||
struct rpmsg_driver {
|
||||
struct device_driver drv;
|
||||
const struct rpmsg_device_id *id_table;
|
||||
int (*probe)(struct rpmsg_channel *dev);
|
||||
void (*remove)(struct rpmsg_channel *dev);
|
||||
void (*callback)(struct rpmsg_channel *, void *, int, void *, u32);
|
||||
int (*probe)(struct rpmsg_device *dev);
|
||||
void (*remove)(struct rpmsg_device *dev);
|
||||
int (*callback)(struct rpmsg_device *, void *, int, void *, u32);
|
||||
};
|
||||
|
||||
int register_rpmsg_device(struct rpmsg_channel *dev);
|
||||
void unregister_rpmsg_device(struct rpmsg_channel *dev);
|
||||
int register_rpmsg_device(struct rpmsg_device *dev);
|
||||
void unregister_rpmsg_device(struct rpmsg_device *dev);
|
||||
int __register_rpmsg_driver(struct rpmsg_driver *drv, struct module *owner);
|
||||
void unregister_rpmsg_driver(struct rpmsg_driver *drv);
|
||||
void rpmsg_destroy_ept(struct rpmsg_endpoint *);
|
||||
struct rpmsg_endpoint *rpmsg_create_ept(struct rpmsg_channel *,
|
||||
rpmsg_rx_cb_t cb, void *priv, u32 addr);
|
||||
int
|
||||
rpmsg_send_offchannel_raw(struct rpmsg_channel *, u32, u32, void *, int, bool);
|
||||
struct rpmsg_endpoint *rpmsg_create_ept(struct rpmsg_device *,
|
||||
rpmsg_rx_cb_t cb, void *priv,
|
||||
struct rpmsg_channel_info chinfo);
|
||||
|
||||
/* use a macro to avoid include chaining to get THIS_MODULE */
|
||||
#define register_rpmsg_driver(drv) \
|
||||
|
|
@ -193,156 +157,14 @@ rpmsg_send_offchannel_raw(struct rpmsg_channel *, u32, u32, void *, int, bool);
|
|||
module_driver(__rpmsg_driver, register_rpmsg_driver, \
|
||||
unregister_rpmsg_driver)
|
||||
|
||||
/**
|
||||
* rpmsg_send() - send a message across to the remote processor
|
||||
* @rpdev: the rpmsg channel
|
||||
* @data: payload of message
|
||||
* @len: length of payload
|
||||
*
|
||||
* This function sends @data of length @len on the @rpdev channel.
|
||||
* The message will be sent to the remote processor which the @rpdev
|
||||
* channel belongs to, using @rpdev's source and destination addresses.
|
||||
* In case there are no TX buffers available, the function will block until
|
||||
* one becomes available, or a timeout of 15 seconds elapses. When the latter
|
||||
* happens, -ERESTARTSYS is returned.
|
||||
*
|
||||
* Can only be called from process context (for now).
|
||||
*
|
||||
* Returns 0 on success and an appropriate error value on failure.
|
||||
*/
|
||||
static inline int rpmsg_send(struct rpmsg_channel *rpdev, void *data, int len)
|
||||
{
|
||||
u32 src = rpdev->src, dst = rpdev->dst;
|
||||
int rpmsg_send(struct rpmsg_endpoint *ept, void *data, int len);
|
||||
int rpmsg_sendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst);
|
||||
int rpmsg_send_offchannel(struct rpmsg_endpoint *ept, u32 src, u32 dst,
|
||||
void *data, int len);
|
||||
|
||||
return rpmsg_send_offchannel_raw(rpdev, src, dst, data, len, true);
|
||||
}
|
||||
|
||||
/**
|
||||
* rpmsg_sendto() - send a message across to the remote processor, specify dst
|
||||
* @rpdev: the rpmsg channel
|
||||
* @data: payload of message
|
||||
* @len: length of payload
|
||||
* @dst: destination address
|
||||
*
|
||||
* This function sends @data of length @len to the remote @dst address.
|
||||
* The message will be sent to the remote processor which the @rpdev
|
||||
* channel belongs to, using @rpdev's source address.
|
||||
* In case there are no TX buffers available, the function will block until
|
||||
* one becomes available, or a timeout of 15 seconds elapses. When the latter
|
||||
* happens, -ERESTARTSYS is returned.
|
||||
*
|
||||
* Can only be called from process context (for now).
|
||||
*
|
||||
* Returns 0 on success and an appropriate error value on failure.
|
||||
*/
|
||||
static inline
|
||||
int rpmsg_sendto(struct rpmsg_channel *rpdev, void *data, int len, u32 dst)
|
||||
{
|
||||
u32 src = rpdev->src;
|
||||
|
||||
return rpmsg_send_offchannel_raw(rpdev, src, dst, data, len, true);
|
||||
}
|
||||
|
||||
/**
|
||||
* rpmsg_send_offchannel() - send a message using explicit src/dst addresses
|
||||
* @rpdev: the rpmsg channel
|
||||
* @src: source address
|
||||
* @dst: destination address
|
||||
* @data: payload of message
|
||||
* @len: length of payload
|
||||
*
|
||||
* This function sends @data of length @len to the remote @dst address,
|
||||
* and uses @src as the source address.
|
||||
* The message will be sent to the remote processor which the @rpdev
|
||||
* channel belongs to.
|
||||
* In case there are no TX buffers available, the function will block until
|
||||
* one becomes available, or a timeout of 15 seconds elapses. When the latter
|
||||
* happens, -ERESTARTSYS is returned.
|
||||
*
|
||||
* Can only be called from process context (for now).
|
||||
*
|
||||
* Returns 0 on success and an appropriate error value on failure.
|
||||
*/
|
||||
static inline
|
||||
int rpmsg_send_offchannel(struct rpmsg_channel *rpdev, u32 src, u32 dst,
|
||||
void *data, int len)
|
||||
{
|
||||
return rpmsg_send_offchannel_raw(rpdev, src, dst, data, len, true);
|
||||
}
|
||||
|
||||
/**
|
||||
* rpmsg_send() - send a message across to the remote processor
|
||||
* @rpdev: the rpmsg channel
|
||||
* @data: payload of message
|
||||
* @len: length of payload
|
||||
*
|
||||
* This function sends @data of length @len on the @rpdev channel.
|
||||
* The message will be sent to the remote processor which the @rpdev
|
||||
* channel belongs to, using @rpdev's source and destination addresses.
|
||||
* In case there are no TX buffers available, the function will immediately
|
||||
* return -ENOMEM without waiting until one becomes available.
|
||||
*
|
||||
* Can only be called from process context (for now).
|
||||
*
|
||||
* Returns 0 on success and an appropriate error value on failure.
|
||||
*/
|
||||
static inline
|
||||
int rpmsg_trysend(struct rpmsg_channel *rpdev, void *data, int len)
|
||||
{
|
||||
u32 src = rpdev->src, dst = rpdev->dst;
|
||||
|
||||
return rpmsg_send_offchannel_raw(rpdev, src, dst, data, len, false);
|
||||
}
|
||||
|
||||
/**
|
||||
* rpmsg_sendto() - send a message across to the remote processor, specify dst
|
||||
* @rpdev: the rpmsg channel
|
||||
* @data: payload of message
|
||||
* @len: length of payload
|
||||
* @dst: destination address
|
||||
*
|
||||
* This function sends @data of length @len to the remote @dst address.
|
||||
* The message will be sent to the remote processor which the @rpdev
|
||||
* channel belongs to, using @rpdev's source address.
|
||||
* In case there are no TX buffers available, the function will immediately
|
||||
* return -ENOMEM without waiting until one becomes available.
|
||||
*
|
||||
* Can only be called from process context (for now).
|
||||
*
|
||||
* Returns 0 on success and an appropriate error value on failure.
|
||||
*/
|
||||
static inline
|
||||
int rpmsg_trysendto(struct rpmsg_channel *rpdev, void *data, int len, u32 dst)
|
||||
{
|
||||
u32 src = rpdev->src;
|
||||
|
||||
return rpmsg_send_offchannel_raw(rpdev, src, dst, data, len, false);
|
||||
}
|
||||
|
||||
/**
|
||||
* rpmsg_send_offchannel() - send a message using explicit src/dst addresses
|
||||
* @rpdev: the rpmsg channel
|
||||
* @src: source address
|
||||
* @dst: destination address
|
||||
* @data: payload of message
|
||||
* @len: length of payload
|
||||
*
|
||||
* This function sends @data of length @len to the remote @dst address,
|
||||
* and uses @src as the source address.
|
||||
* The message will be sent to the remote processor which the @rpdev
|
||||
* channel belongs to.
|
||||
* In case there are no TX buffers available, the function will immediately
|
||||
* return -ENOMEM without waiting until one becomes available.
|
||||
*
|
||||
* Can only be called from process context (for now).
|
||||
*
|
||||
* Returns 0 on success and an appropriate error value on failure.
|
||||
*/
|
||||
static inline
|
||||
int rpmsg_trysend_offchannel(struct rpmsg_channel *rpdev, u32 src, u32 dst,
|
||||
void *data, int len)
|
||||
{
|
||||
return rpmsg_send_offchannel_raw(rpdev, src, dst, data, len, false);
|
||||
}
|
||||
int rpmsg_trysend(struct rpmsg_endpoint *ept, void *data, int len);
|
||||
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);
|
||||
|
||||
#endif /* _LINUX_RPMSG_H */
|
||||
|
|
|
|||
|
|
@ -24,38 +24,52 @@
|
|||
#define MSG "hello world!"
|
||||
#define MSG_LIMIT 100
|
||||
|
||||
static void rpmsg_sample_cb(struct rpmsg_channel *rpdev, void *data, int len,
|
||||
struct instance_data {
|
||||
int rx_count;
|
||||
};
|
||||
|
||||
static int rpmsg_sample_cb(struct rpmsg_device *rpdev, void *data, int len,
|
||||
void *priv, u32 src)
|
||||
{
|
||||
int ret;
|
||||
static int rx_count;
|
||||
struct instance_data *idata = dev_get_drvdata(&rpdev->dev);
|
||||
|
||||
dev_info(&rpdev->dev, "incoming msg %d (src: 0x%x)\n", ++rx_count, src);
|
||||
dev_info(&rpdev->dev, "incoming msg %d (src: 0x%x)\n",
|
||||
++idata->rx_count, src);
|
||||
|
||||
print_hex_dump(KERN_DEBUG, __func__, DUMP_PREFIX_NONE, 16, 1,
|
||||
data, len, true);
|
||||
|
||||
/* samples should not live forever */
|
||||
if (rx_count >= MSG_LIMIT) {
|
||||
if (idata->rx_count >= MSG_LIMIT) {
|
||||
dev_info(&rpdev->dev, "goodbye!\n");
|
||||
return;
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* send a new message now */
|
||||
ret = rpmsg_send(rpdev, MSG, strlen(MSG));
|
||||
ret = rpmsg_send(rpdev->ept, MSG, strlen(MSG));
|
||||
if (ret)
|
||||
dev_err(&rpdev->dev, "rpmsg_send failed: %d\n", ret);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int rpmsg_sample_probe(struct rpmsg_channel *rpdev)
|
||||
static int rpmsg_sample_probe(struct rpmsg_device *rpdev)
|
||||
{
|
||||
int ret;
|
||||
struct instance_data *idata;
|
||||
|
||||
dev_info(&rpdev->dev, "new channel: 0x%x -> 0x%x!\n",
|
||||
rpdev->src, rpdev->dst);
|
||||
|
||||
idata = devm_kzalloc(&rpdev->dev, sizeof(*idata), GFP_KERNEL);
|
||||
if (!idata)
|
||||
return -ENOMEM;
|
||||
|
||||
dev_set_drvdata(&rpdev->dev, idata);
|
||||
|
||||
/* send a message to our remote processor */
|
||||
ret = rpmsg_send(rpdev, MSG, strlen(MSG));
|
||||
ret = rpmsg_send(rpdev->ept, MSG, strlen(MSG));
|
||||
if (ret) {
|
||||
dev_err(&rpdev->dev, "rpmsg_send failed: %d\n", ret);
|
||||
return ret;
|
||||
|
|
@ -64,7 +78,7 @@ static int rpmsg_sample_probe(struct rpmsg_channel *rpdev)
|
|||
return 0;
|
||||
}
|
||||
|
||||
static void rpmsg_sample_remove(struct rpmsg_channel *rpdev)
|
||||
static void rpmsg_sample_remove(struct rpmsg_device *rpdev)
|
||||
{
|
||||
dev_info(&rpdev->dev, "rpmsg sample client driver is removed\n");
|
||||
}
|
||||
|
|
|
|||
Загрузка…
Ссылка в новой задаче