linux-dev/arch/riscv/kernel/cpu_ops_spinwait.c, branch linus/masterLinux kernel development work - see feature brancheshttps://git.zx2c4.com/linux-dev/atom/arch/riscv/kernel/cpu_ops_spinwait.c?h=linus%2Fmaster2022-01-20T17:27:08ZRISC-V: Use __cpu_up_stack/task_pointer only for spinwait method2022-01-20T17:27:08ZAtish Patraatishp@rivosinc.com2022-01-20T09:09:15Zurn:sha1:c78f94f35cf6486c4057317e8de3ddc4c62e12c7
The __cpu_up_stack/task_pointer array is only used for spinwait method
now. The per cpu array based lookup is also fragile for platforms with
discontiguous/sparse hartids. The spinwait method is only used for
M-mode Linux or older firmwares without SBI HSM extension. For general
Linux systems, ordered booting method is preferred anyways to support
cpu hotplug and kexec.
Make sure that __cpu_up_stack/task_pointer is only used for spinwait
method. Take this opportunity to rename it to
__cpu_spinwait_stack/task_pointer to emphasize the purpose as well.
Reviewed-by: Anup Patel <anup@brainfault.org>
Signed-off-by: Atish Patra <atishp@rivosinc.com>
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
RISC-V: Add cpu_ops and modify default booting method2020-03-31T18:25:56ZAtish Patraatish.patra@wdc.com2020-03-18T01:11:40Zurn:sha1:2875fe0561569f82d0e63658ccf0d11ce7da8922
Currently, all non-booting harts start booting after the booting hart
updates the per-hart stack pointer. This is done in a way that, it's
difficult to implement any other booting method without breaking the
backward compatibility.
Define a cpu_ops method that allows to introduce other booting methods
in future. Modify the current booting method to be compatible with
cpu_ops.
Signed-off-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>