linux.git/drivers/soc/apple/rtkit.c, branch v6.11

soc: apple: rtkit: Port to the internal mailbox driver

2023-11-23T10:10:17+00:00

Now that we have a mailbox driver in drivers/soc/apple, port the RTKit
code to it. This mostly just entails replacing calls through the mailbox
subsystem with direct calls into the driver.

Acked-by: Eric Curtin 
Acked-by: Neal Gompa 
Acked-by: Alyssa Rosenzweig 
Signed-off-by: Hector Martin

soc: apple: rtkit: Get rid of apple_rtkit_send_message_wait

2023-11-23T10:09:24+00:00

It is fundamentally broken and has no users. Just remove it.

Acked-by: Eric Curtin 
Acked-by: Neal Gompa 
Acked-by: Alyssa Rosenzweig 
Signed-off-by: Hector Martin

soc: apple: rtkit: Crop syslog messages

2023-03-28T10:59:34+00:00

Crop trailing whitespace, null, and newline characters in syslog
messages received from coprocessors. Notably DCP sends its messages
including a trailing newline, so prior to this change we would end up
cluttering the kernel log by repeated newlines at the end of messages.

Signed-off-by: Martin Povišer 
Reviewed-by: Hector Martin 
Signed-off-by: Hector Martin

soc: apple: rtkit: Fix buffer address field width

2023-03-28T10:45:00+00:00

The buffer address field is missing two bits. This matters for the GPU,
which uses upper-half 64-bit addresses on the ASC and those get sign
extended from the mailbox message field, so the right number of high
bits need to be set.

Signed-off-by: Asahi Lina 
Reviewed-by: Sven Peter 
Signed-off-by: Hector Martin

soc: apple: rtkit: Export non-devm init/free functions

2023-01-31T11:40:14+00:00

While we normally encourage devm usage by drivers, some consumers (and
in particular the upcoming Rust abstractions) might want to manually
manage memory. Export the raw functions to make this possible.

Signed-off-by: Asahi Lina 
Reviewed-by: Sven Peter 
Reviewed-by: Eric Curtin 
Signed-off-by: Hector Martin

soc: apple: rtkit: Add apple_rtkit_idle() function

2023-01-31T11:35:47+00:00

This is yet another low power mode, used by DCP.

Reviewed-by: Eric Curtin 
Reviewed-by: Sven Peter 
Signed-off-by: Hector Martin

soc: apple: rtkit: Stop casting function pointer signatures

2022-11-28T11:34:09+00:00

Fixes: 9bd1d9a0d8bb ("soc: apple: Add RTKit IPC library")
Reported-by: kernel test robot 
Signed-off-by: Sven Peter 
Signed-off-by: Hector Martin

soc: apple: rtkit: Add apple_rtkit_poll

2022-09-17T17:53:29+00:00

This allows a client to receive messages in atomic context, by polling.

Signed-off-by: Hector Martin 
Signed-off-by: Russell King (Oracle) 
Reviewed-by: Sven Peter 
Reviewed-by: Eric Curtin 
Reviewed-by: Linus Walleij 
Signed-off-by: Arnd Bergmann

soc: apple: Add RTKit IPC library

2022-05-01T14:55:06+00:00

Apple SoCs such as the M1 come with multiple embedded co-processors
running proprietary firmware. Communication with those is established
over a simple mailbox using the RTKit IPC protocol.

This cannot be implemented inside the mailbox subsystem since on top
of communication over channels we also need support for starting,
hibernating and resetting these co-processors. We also need to
handle shared memory allocations differently depending on the
co-processor and don't want to split that across multiple drivers.

Reviewed-by: Arnd Bergmann 
Signed-off-by: Sven Peter