projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 222de7bf | 2 | #include <linux/delay.h> |
| d6bd0579 MG |
3 | #include <linux/init.h> |
| 4 | #include <linux/smp.h> | |
| 5 | #include "smc.h" | |
| 6 | ||
| 7 | static int tango_boot_secondary(unsigned int cpu, struct task_struct *idle) | |
| 8 | { | |
| 64fc2a94 | 9 | tango_set_aux_boot_addr(__pa_symbol(secondary_startup)); |
| d6bd0579 MG |
10 | tango_start_aux_core(cpu); |
| 11 | return 0; | |
| 12 | } | |
| 13 | ||
| 222de7bf MG |
14 | #ifdef CONFIG_HOTPLUG_CPU |
| 15 | /* | |
| 16 | * cpu_kill() and cpu_die() run concurrently on different cores. | |
| 17 | * Firmware will only "kill" a core once it has properly "died". | |
| 18 | * Try a few times to kill a core before giving up, and sleep | |
| 19 | * between tries to give that core enough time to die. | |
| 20 | */ | |
| 21 | static int tango_cpu_kill(unsigned int cpu) | |
| 22 | { | |
| 23 | int i, err; | |
| 24 | ||
| 25 | for (i = 0; i < 10; ++i) { | |
| 26 | msleep(10); | |
| 27 | err = tango_aux_core_kill(cpu); | |
| 28 | if (!err) | |
| 29 | return true; | |
| 30 | } | |
| 31 | ||
| 32 | return false; | |
| 33 | } | |
| 34 | ||
| 35 | static void tango_cpu_die(unsigned int cpu) | |
| 36 | { | |
| 37 | while (tango_aux_core_die(cpu) < 0) | |
| 38 | cpu_relax(); | |
| 39 | ||
| 40 | panic("cpu %d failed to die\n", cpu); | |
| 41 | } | |
| 222de7bf MG |
42 | #endif |
| 43 | ||
| c38ac80e | 44 | static const struct smp_operations tango_smp_ops __initconst = { |
| d6bd0579 | 45 | .smp_boot_secondary = tango_boot_secondary, |
| 8264dde5 | 46 | #ifdef CONFIG_HOTPLUG_CPU |
| 222de7bf MG |
47 | .cpu_kill = tango_cpu_kill, |
| 48 | .cpu_die = tango_cpu_die, | |
| 8264dde5 | 49 | #endif |
| d6bd0579 MG |
50 | }; |
| 51 | ||
| 52 | CPU_METHOD_OF_DECLARE(tango4_smp, "sigma,tango4-smp", &tango_smp_ops); |