Linux kernel stable tree (mirror) https://git.radix-linux.su/kernel/linux.git/atom?h=linux-6.0.y 2022-12-31T12:25:40+00:00 2022-12-31T12:25:40+00:00 Sven Peter sven@svenpeter.dev 2022-11-04T15:41:53+00:00 urn:sha1:ad4c61dc869c9a0d7f439fd60baea24b1fa899e5 [ Upstream commit 5acf07ff25f0c1c44105e6b8ebf88c55a0a04d2f ] Fixes: 9bd1d9a0d8bb ("soc: apple: Add RTKit IPC library") Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Sven Peter <sven@svenpeter.dev> Signed-off-by: Hector Martin <marcan@marcan.st> Signed-off-by: Sasha Levin <sashal@kernel.org> 2022-05-01T14:55:06+00:00 Sven Peter sven@svenpeter.dev 2022-05-01T14:55:06+00:00 urn:sha1:9bd1d9a0d8bb1a549831fd98fcc3105960f7068b 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 <arnd@arndb.de> Signed-off-by: Sven Peter <sven@svenpeter.dev>