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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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19ab428f4b
Add comments to machine_shutdown()/halt()/power_off()/restart() that describe their purpose and/or requirements re: CPUs being active/not. In machine_shutdown(), replace the call to smp_send_stop() with a call to disable_nonboot_cpus(). This completely disables all but one CPU, thus satisfying the requirement that only a single CPU be active for kexec. Adjust Kconfig dependencies for this change. In machine_halt()/power_off()/restart(), call smp_send_stop() directly, rather than via machine_shutdown(); these functions don't need to completely de-activate all CPUs using hotplug, but rather just quiesce them. Remove smp_kill_cpus(), and its call from smp_send_stop(). smp_kill_cpus() was indirectly calling smp_ops.cpu_kill() without calling smp_ops.cpu_die() on the target CPUs first. At least some implementations of smp_ops had issues with this; it caused cpu_kill() to hang on Tegra, for example. Since smp_send_stop() is only used for shutdown, halt, and power-off, there is no need to attempt any kind of CPU hotplug here. Adjust Kconfig to reflect that machine_shutdown() (and hence kexec) relies upon disable_nonboot_cpus(). However, this alone doesn't guarantee that hotplug will work, or even that hotplug is implemented for a particular piece of HW that a multi-platform zImage runs on. Hence, add error-checking to machine_kexec() to determine whether it did work. Suggested-by: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: Stephen Warren <swarren@nvidia.com> Acked-by: Will Deacon <will.deacon@arm.com> Tested-by: Zhangfei Gao <zhangfei.gao@gmail.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> |
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| .. | ||
| .gitignore | ||
| arch_timer.c | ||
| armksyms.c | ||
| arthur.c | ||
| asm-offsets.c | ||
| atags_compat.c | ||
| atags_parse.c | ||
| atags_proc.c | ||
| atags.h | ||
| bios32.c | ||
| calls.S | ||
| cpuidle.c | ||
| crash_dump.c | ||
| debug.S | ||
| devtree.c | ||
| dma-isa.c | ||
| dma.c | ||
| early_printk.c | ||
| elf.c | ||
| entry-armv.S | ||
| entry-common.S | ||
| entry-header.S | ||
| etm.c | ||
| fiq.c | ||
| fiqasm.S | ||
| ftrace.c | ||
| head-common.S | ||
| head-nommu.S | ||
| head.S | ||
| hw_breakpoint.c | ||
| hyp-stub.S | ||
| insn.c | ||
| insn.h | ||
| io.c | ||
| irq.c | ||
| isa.c | ||
| iwmmxt.S | ||
| jump_label.c | ||
| kgdb.c | ||
| kprobes-arm.c | ||
| kprobes-common.c | ||
| kprobes-test-arm.c | ||
| kprobes-test-thumb.c | ||
| kprobes-test.c | ||
| kprobes-test.h | ||
| kprobes-thumb.c | ||
| kprobes.c | ||
| kprobes.h | ||
| machine_kexec.c | ||
| Makefile | ||
| module.c | ||
| opcodes.c | ||
| patch.c | ||
| patch.h | ||
| perf_event_cpu.c | ||
| perf_event_v6.c | ||
| perf_event_v7.c | ||
| perf_event_xscale.c | ||
| perf_event.c | ||
| pj4-cp0.c | ||
| process.c | ||
| psci.c | ||
| ptrace.c | ||
| relocate_kernel.S | ||
| return_address.c | ||
| sched_clock.c | ||
| setup.c | ||
| signal.c | ||
| signal.h | ||
| sleep.S | ||
| smp_scu.c | ||
| smp_tlb.c | ||
| smp_twd.c | ||
| smp.c | ||
| stacktrace.c | ||
| suspend.c | ||
| swp_emulate.c | ||
| sys_arm.c | ||
| sys_oabi-compat.c | ||
| tcm.c | ||
| thumbee.c | ||
| time.c | ||
| topology.c | ||
| traps.c | ||
| unwind.c | ||
| vmlinux.lds.S | ||
| xscale-cp0.c | ||