kernel/drivers/misc/ocxl/main.c, branch linux-rolling-stable

misc: ocxl: main: Remove unnecessary ‘0’ values from rc

2023-11-27T11:01:14Z

rc is assigned first, so it does not need to initialize the assignment. Signed-off-by: Li kunyu Acked-by: Andrew Donnellan Signed-off-by: Michael Ellerman Link: https://msgid.link/20231113015229.12074-1-kunyu@nfschina.com

powerpc/64s/radix: introduce options to disable use of the tlbie instruction

2019-09-05T04:22:41Z

Introduce two options to control the use of the tlbie instruction. A boot time option which completely disables the kernel using the instruction, this is currently incompatible with HASH MMU, KVM, and coherent accelerators. And a debugfs option can be switched at runtime and avoids using tlbie for invalidating CPU TLBs for normal process and kernel address mappings. Coherent accelerators are still managed with tlbie, as will KVM partition scope translations. Cross-CPU TLB flushing is implemented with IPIs and tlbiel. This is a basic implementation which does not attempt to make any optimisation beyond the tlbie implementation. This is useful for performance testing among other things. For example in certain situations on large systems, using IPIs may be faster than tlbie as they can be directed rather than broadcast. Later we may also take advantage of the IPIs to do more interesting things such as trim the mm cpumask more aggressively. Signed-off-by: Nicholas Piggin Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20190902152931.17840-7-npiggin@gmail.com

ocxl: Driver code for 'generic' opencapi devices

2018-01-24T00:42:58Z

Add an ocxl driver to handle generic opencapi devices. Of course, it's not meant to be the only opencapi driver, any device is free to implement its own. But if a host application only needs basic services like attaching to an opencapi adapter, have translation faults handled or allocate AFU interrupts, it should suffice. The AFU config space must follow the opencapi specification and use the expected vendor/device ID to be seen by the generic driver. The driver exposes the device AFUs as a char device in /dev/ocxl/ Note that the driver currently doesn't handle memory attached to the opencapi device. Signed-off-by: Frederic Barrat Signed-off-by: Andrew Donnellan Signed-off-by: Alastair D'Silva Signed-off-by: Michael Ellerman