msm: ipc: Update server lookup operation to return complete information

QMI Server lookup returns only node_id and port_id. This information is
not sufficient when the QMI clients look for a specific instance of a
service. Hence the server lookup routine returns the instance ID along
with the server address information.

Change-Id: I644e6c8bb9dc3108c0198b7779ef277aa65f7bc5
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@codeaurora.org>
msm: ipc: Fix the logic while dumping IPC Router routing table info

IPC Router Routing table is organized as a hash table. The routing
table information is dumped based on the index into that hash table.
Update the logic to dump the routing table information based on the
subsystem's node id.

Change-Id: Ideaf24934b93349e2f2cf1d695d08841c04aa5f9
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@codeaurora.org>
msm: ipc: Update HELLO message processing

When IPC Router receives a HELLO message from a remote IPC Router, the
protocol is to send a list of servers registered locally and registered
outside the mesh network where the HELLO message is received. Currently
the implementation does not follow this protocol strictly and hence
correct the implementation.

CRs-Fixed: 414147
Change-Id: I75aa089b152baea0925d127b1d9deb6684677cfa
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@codeaurora.org>
msm: ipc: Reorganize server hash table

QMI server(<service_id:instance_id>) info is maintained using a hash
table. The server's instance_id is used as the key to index into that
hash table to perform maintenance operations(add, lookup, delete).
The service_id values are well distributed than the instance_id values
and hence the operations on the hash table are not optimized. Optimize
the hash table operations by using server's service_id as the key to
index into the hash table.

While accessing the server hash table, the mutexes are locked and
unlocked inside the access functions. This introduces some race
conditions once the access functions return. So lock and unlock the
server hash table mutex outside the access functions.

CRs-Fixed: 415158
Change-Id: Id1ce6bbfc677df26ff209fd62dca8553c7d2b4a5
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@codeaurora.org>
msm: ipc: Fix lockdep warning by IPC message router

IPC Message Router while processing the HELLO message, sends a server list
information registered locally to the remote subsystem which has sent the
HELLO message. IPC Message Router does this operation by locking mutexes
in the following order:
1) routing_table_lock
2) server_list_lock inside msm_ipc_router_send_server_list

IPC Message Router while processing the NEW_SERVER message, accesses the
server list information to check if the server information advertised by
the remote subsystem is already known before adding that information to
the server list. IPC Message Router does this operation by locking mutexes
in the following order:
1) server_list_lock
2) routing_table_lock inside msm_ipc_router_lookup_remote_port

This leads to a deadlock if the IPC message router processes HELLO message
from one subsystem and NEW_SERVER message from another subsystem. Fix this
out of order locking scenario by locking the server_list_lock before
accessing the msm_ipc_router_send_server_list function.

CRs-Fixed: 417155
Change-Id: Ie38c1c21dccefac7a9b36ad107b13feccd986ed2
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@codeaurora.org>
msm: ipc: IPC Router updates to support QMI in the kernel

1) Move the kernel interface APIs to a separate header file.
2) Use platform device to indicate the arrival/exit of service.
3) Add kernel APIs to send and receive messages through IPC Router.
4) Clean up unused Macros, enums, header inclusion.

Change-Id: I1541e9815d104f7ea46d19c10b57c77d967bd065
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@codeaurora.org>
msm: ipc: Security updates to IPC Router

In order to provide fine-grained access control to QMI services,
a security script from user-space will feed the security rules to
IPC Router. The security rule implies that in order to send a QMI
message to a service, a client process should belong to a specific
Linux/Android group. IPC Router, after receiving the security rules,
will enforce the access control rules.

Change-Id: I49f8d7c0067fc37cb0b4de2ccb46a575905ef64f
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@codeaurora.org>
msm: ipc: Send REMOVE_CLIENT message when a server port is closed

When the server port is closed, only REMOVE_SERVER message is sent. If
the same port is used as a client port prior to the server registration,
then the IPC Router in the remote subsystem does not clean up the client
information associated with that port. This leads to memory leak in the
remote subsystem.

When the server exits and closes the port, IPC Router has to send both
REMOVE_SERVER and REMOVE_CLIENT messages. This ensures that the
IPC Router in the remote subsystem cleans up both the client and server
information associated with that port.

CRs-Fixed: 434981
Change-Id: I1d59aa773398d10dd5c648969b9da2e1cf481d24
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@codeaurora.org>
msm: ipc: Add SMD link to interface with WCNSS

This new SMD link will enable QMI/IPC Router communication between
Application processor and WCNSS.

Change-Id: I140834bd193e110e636d3945aa5dc93b3306ef05
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@codeaurora.org>
msm: ipc: Allow QMI clients to send messages after IRSC is complete

Currently there exists a small time interval during initialization
where QMI clients in user-space can communicate with QMI services
before the IPC Router Security Configuration(IRSC) is complete.

Only allow clients to communicate after IRSC is complete.

Change-Id: I773ad5b3cb02c51a725cd60a77466876c1498b64
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@codeaurora.org>
msm: ipc: Advertise service information only from alive subsystems

As part of processing HELLO message, IPC Router does not check the status
of a subsystem before trying to advertise the services hosted in that
subsystem. During the subsystem restart scenario, sometimes two or more
subsystems get reset together. When one of the subsystems come up, IPC
Router ends up accessing the data structures of the other subsystems that
are still in shutdown stage. This causes the IPC Router to trigger invalid
pointer dereference.

Check the status of the subsystem before trying to advertise the services
hosted in that subsystem.

CRs-Fixed: 447217
Change-Id: I50bc2bc21fcfd31ba23f6ebba5728f13268a76e5
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@codeaurora.org>
msm: ipc: Cache the length of a packet being looped back

When a message is looped back to the user-space, sometimes the
receiver acts quickly, reads the contents of the packet and frees
the buffer. This leads to a scenario where the sender is trying to
dereference the packet length info of a freed packet. Hence a garbage
packet length gets returned to the user-space.

Fix this race condition by storing the packet length of the packet
being looped back into a variable and return the value of that variable
when the loopback operation is complete.

Change-Id: I595a562bfa12151b2f9154df681ce23c965dfff5
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@codeaurora.org>
msm: ipc: Update the wakelock naming format for the local ports

Update the wakelock names to "ipc<local_port_id>_<port_owner>". This
enables easier identification of the wakelock owners.

Change-Id: Ife2bcbea5f4ab27269749123475065b6ec7b7f0b
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@codeaurora.org>
msm: ipc: Add check to avoid integer & buffer overflow

In IPC Router service lookup operation, add check to avoid an integer
overflow and hence a buffer overflow.

CRs-Fixed: 457402
Change-Id: Ibe949fe20aad88b15679bdc96ebc505e4395ac3b
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@codeaurora.org>
msm: ipc: Enable IPC logging on MDM9615

Enable IPC Logging feature on MDM 9615 target

CRs-Fixed: 566132
Change-Id: I581d0665dbc64ffe68071ef3c598aa194b195cc1
Signed-off-by: Zaheerulla Meer <zmeer@codeaurora.org>
lib: qmi: Introduce QMI Encode/Decode library

Introduce Encode/Decode Library to perform QMI message marshaling.
The QMI Encode/Decode Library encodes the kernel C data structures into
QMI wire format and decodes the messages in QMI wire format into kernel
C structures.

Change-Id: Ib443e697dafedeac8a790de9a3a8ed4a8444082f
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@codeaurora.org>
msm: ipc: Add support for IPC Logging

Enhance IPC Router to log information pertaining to the messages
exchanged between user-space and other systems.

Change-Id: I8ef3e793a85bcdb14c69eb96278ce2ea8a47df96
Signed-off-by: Zaheerulla Meer <zmeer@codeaurora.org>
msm: ipc: Change IPC log file name for IPC Router

Change the name of the files that contain the IPC log information
from the IPC Router. This change is done to reflect the module name
as a part of the IPC log file name.

Change-Id: I541aa5866251348b472eba6d1b3d1840500387f9
Signed-off-by: Zaheerulla Meer <zmeer@codeaurora.org>
msm: ipc: Add IPC Logging support to IPC Router

IPC Router to log debug & Router-to-Router messages onto the IPC Log
buffer. This will enable debugging the IPC Router initialization
issues and Router-to-Router communication issues, using debugfs without
logging to the kernel logs.

Change-Id: I90d968baf355f2f9abe95ea53d8b059781e8fbc6
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@codeaurora.org>
msm: ipc: Update recvmsg operation to be non-blocking by default

Update the IPC Router recvmsg operation to be non-blocking by default
and return 0 when there is no data to read.

CRs-Fixed: 464634
Change-Id: I1f43e3a36d72312372a3ac141d506c81a613c408
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@codeaurora.org>