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Date: Tue, 22 Sep 2020 13:36:24 -0600
From: Mathieu Poirier <mathieu.poirier@...aro.org>
To: Arnaud POULIQUEN <arnaud.pouliquen@...com>
Cc: "ohad@...ery.com" <ohad@...ery.com>,
"bjorn.andersson@...aro.org" <bjorn.andersson@...aro.org>,
"guennadi.liakhovetski@...ux.intel.com"
<guennadi.liakhovetski@...ux.intel.com>,
Loic PALLARDY <loic.pallardy@...com>,
"linux-remoteproc@...r.kernel.org" <linux-remoteproc@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 04/10] rpmsg: Move common structures and defines to
headers
On Tue, Sep 22, 2020 at 04:26:23PM +0200, Arnaud POULIQUEN wrote:
> Hi Mathieu,
>
> On 9/22/20 2:09 AM, Mathieu Poirier wrote:
> > From: Guennadi Liakhovetski <guennadi.liakhovetski@...ux.intel.com>
> >
> > virtio_rpmsg_bus.c keeps RPMsg protocol structure declarations and
> > common defines like the ones, needed for name-space announcements,
> > internal. Move them to common headers instead.
> >
> > Signed-off-by: Guennadi Liakhovetski <guennadi.liakhovetski@...ux.intel.com>
> > [Renamed header file from linux/rpmsg/rpmsg_virtio.h to linux/rpmsg_ns.h]
> > Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
> > ---
> > drivers/rpmsg/virtio_rpmsg_bus.c | 78 +-----------------------------
> > include/linux/rpmsg_ns.h | 83 ++++++++++++++++++++++++++++++++
> > include/uapi/linux/rpmsg.h | 3 ++
> > 3 files changed, 88 insertions(+), 76 deletions(-)
> > create mode 100644 include/linux/rpmsg_ns.h
> >
> > diff --git a/drivers/rpmsg/virtio_rpmsg_bus.c b/drivers/rpmsg/virtio_rpmsg_bus.c
> > index e87cf0b79542..eaf3b2c012c8 100644
> > --- a/drivers/rpmsg/virtio_rpmsg_bus.c
> > +++ b/drivers/rpmsg/virtio_rpmsg_bus.c
> > @@ -19,6 +19,7 @@
> > #include <linux/mutex.h>
> > #include <linux/of_device.h>
> > #include <linux/rpmsg.h>
> > +#include <linux/rpmsg_ns.h>
> > #include <linux/scatterlist.h>
> > #include <linux/slab.h>
> > #include <linux/sched.h>
> > @@ -27,6 +28,7 @@
> > #include <linux/virtio_ids.h>
> > #include <linux/virtio_config.h>
> > #include <linux/wait.h>
> > +#include <uapi/linux/rpmsg.h>
> >
> > #include "rpmsg_internal.h"
> >
> > @@ -70,58 +72,6 @@ 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_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 {
> > - __virtio32 src;
> > - __virtio32 dst;
> > - __virtio32 reserved;
> > - __virtio16 len;
> > - __virtio16 flags;
> > - u8 data[];
> > -} __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];
> > - __virtio32 addr;
> > - __virtio32 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,
> > -};
> > -
> > /**
> > * struct virtio_rpmsg_channel - rpmsg channel descriptor
> > * @rpdev: the rpmsg channel device
> > @@ -139,27 +89,6 @@ struct virtio_rpmsg_channel {
> > #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
> > - * number of buffers will be computed from the number of buffers supported
> > - * by the vring, upto a maximum of 512 buffers (256 in each direction).
> > - *
> > - * Each buffer will have 16 bytes for the msg header and 496 bytes for
> > - * the payload.
> > - *
> > - * This will utilize a maximum total space of 256KB for the buffers.
> > - *
> > - * We might also want to add support for user-provided buffers in time.
> > - * This will allow bigger buffer size flexibility, and can also be used
> > - * to achieve zero-copy messaging.
> > - *
> > - * Note that these numbers are purely a decision of this driver - we
> > - * can change this without changing anything in the firmware of the remote
> > - * processor.
> > - */
> > -#define MAX_RPMSG_NUM_BUFS (512)
> > -#define MAX_RPMSG_BUF_SIZE (512)
> > -
> > /*
> > * Local addresses are dynamically allocated on-demand.
> > * We do not dynamically assign addresses from the low 1024 range,
> > @@ -167,9 +96,6 @@ struct virtio_rpmsg_channel {
> > */
> > #define RPMSG_RESERVED_ADDRESSES (1024)
> >
> > -/* Address 53 is reserved for advertising remote services */
> > -#define RPMSG_NS_ADDR (53)
> > -
> > 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,
> > diff --git a/include/linux/rpmsg_ns.h b/include/linux/rpmsg_ns.h
> > new file mode 100644
> > index 000000000000..aabc6c3c0d6d
> > --- /dev/null
> > +++ b/include/linux/rpmsg_ns.h
> > @@ -0,0 +1,83 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +
> > +#ifndef _LINUX_RPMSG_NS_H
> > +#define _LINUX_RPMSG_NS_H
> > +
> > +#include <linux/mod_devicetable.h>
> > +#include <linux/types.h>
> > +#include <linux/virtio_types.h>
>
> That means that this file is correlated with the virtio, right?
> there is a risk that It cannot be used by some platforms which not use virtio...
An astute observation...
>
> > +
> > +/**
> > + * 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 {
> > + __virtio32 src;
> > + __virtio32 dst;
> > + __virtio32 reserved;
> > + __virtio16 len;
> > + __virtio16 flags;
> > + u8 data[];
> > +} __packed;
> This header is related to the virtio implementation, and represent the header of
> the RPMsgs in virtio implementation not only the ns annoucement.
>
> What about splitting it in 2 files?
> 1) rpmsg_ns.h
> definitions related to the ns announcement
>
> 2) rpmsg_virtio.h
> - definitions related to the RPMsg virtio implementation
> - This file could include the rpmsg_ns.h
Yes, that make sense.
>
> Thanks,
> Arnaud
>
> > +
> > +/**
> > + * 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];
> > + __virtio32 addr;
> > + __virtio32 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,
> > +};
> > +
> > +/*
> > + * We're allocating buffers of 512 bytes each for communications. The
> > + * number of buffers will be computed from the number of buffers supported
> > + * by the vring, upto a maximum of 512 buffers (256 in each direction).
> > + *
> > + * Each buffer will have 16 bytes for the msg header and 496 bytes for
> > + * the payload.
> > + *
> > + * This will utilize a maximum total space of 256KB for the buffers.
> > + *
> > + * We might also want to add support for user-provided buffers in time.
> > + * This will allow bigger buffer size flexibility, and can also be used
> > + * to achieve zero-copy messaging.
> > + *
> > + * Note that these numbers are purely a decision of this driver - we
> > + * can change this without changing anything in the firmware of the remote
> > + * processor.
> > + */
> > +#define MAX_RPMSG_NUM_BUFS 512
> > +#define MAX_RPMSG_BUF_SIZE 512
> > +
> > +/* Address 53 is reserved for advertising remote services */
> > +#define RPMSG_NS_ADDR 53
> > +
> > +#endif
> > diff --git a/include/uapi/linux/rpmsg.h b/include/uapi/linux/rpmsg.h
> > index e14c6dab4223..d669c04ef289 100644
> > --- a/include/uapi/linux/rpmsg.h
> > +++ b/include/uapi/linux/rpmsg.h
> > @@ -24,4 +24,7 @@ struct rpmsg_endpoint_info {
> > #define RPMSG_CREATE_EPT_IOCTL _IOW(0xb5, 0x1, struct rpmsg_endpoint_info)
> > #define RPMSG_DESTROY_EPT_IOCTL _IO(0xb5, 0x2)
> >
> > +/* The feature bitmap for virtio rpmsg */
> > +#define VIRTIO_RPMSG_F_NS 0 /* RP supports name service notifications */
> > +
> > #endif
> >
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