The glink protocol works with a shared-memory(transport) for
communication between the local and remote processors. The
existing glink-rpm driver implements the basic features
of the protocol and uses msgram as the transport.
The same is extended to support smem based transport as well.
The first few patches consolidates the code, so that the
core protocol code is made common for both the types of
transport.
The next set of patches adds the additional features of the
protocol required by clients using smem based transport,
particularly support for intents.
* What is intents ?
Intents are nothing but pre-allocated buffers that
both the local and the remote clients allocate and
share the details (about the buffer size and an id)
before intending to receive data. The transmitter then
searches for an suitable 'intent-id' based on size from
the list that it was notified previously and sends the data
targeting that intent buffer, which is then copied by the
receiver in to the same intent-buffer. So this avoids memory
allocation stalls on copy based transports.
[V2]
Fixed review comments and a race condition when the remote
device goes down. Added 2 small patches for fixing the same.
Previous version is here [1]
[1] https://www.spinics.net/lists/arm-kernel/msg601119.html
Bjorn Andersson (7):
rpmsg: glink: Rename glink_rpm_xx functions to qcom_glink_xx
rpmsg: glink: Associate indirections for pipe fifo accessor's
rpmsg: glink: Split rpm_probe to reuse the common code
rpmsg: glink: Move the common glink protocol implementation to
glink_native.c
rpmsg: glink: Allow unaligned data access
rpmsg: glink: Introduce glink smem based transport
rpmsg: glink: Make RX FIFO peak accessor to take an offset
Sricharan R (13):
rpmsg: glink: Return -EAGAIN when there is no FIFO space
rpmsg: glink: Do a mbox_free_channel in remove
rpmsg: glink: Fix default case while handling received commands
rpmsg: glink: Add support for transport version negotiation
rpmsg: glink: Fix idr_lock from mutex to spinlock
rpmsg: glink: Add support for TX intents
rpmsg: glink: Use the local intents when receiving data
rpmsg: glink: Add rx done command
rpmsg: glink: Add announce_create ops and preallocate intents
rpmsg: glink: Receive and store the remote intent buffers
rpmsg: glink: Use the intents passed by remote
rpmsg: glink: Request for intents when unavailable
rpmsg: glink: Handle remote rx done command
drivers/rpmsg/Kconfig | 16 +-
drivers/rpmsg/Makefile | 2 +
drivers/rpmsg/qcom_glink_native.c | 1611 +++++++++++++++++++++++++++++++++++++
drivers/rpmsg/qcom_glink_native.h | 45 ++
drivers/rpmsg/qcom_glink_rpm.c | 1026 ++---------------------
drivers/rpmsg/qcom_glink_smem.c | 316 ++++++++
include/linux/rpmsg/qcom_glink.h | 27 +
7 files changed, 2092 insertions(+), 951 deletions(-)
create mode 100644 drivers/rpmsg/qcom_glink_native.c
create mode 100644 drivers/rpmsg/qcom_glink_native.h
create mode 100644 drivers/rpmsg/qcom_glink_smem.c
create mode 100644 include/linux/rpmsg/qcom_glink.h
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