231f929686
Currently, there are two consumers of the Linux kernel CPU hotplug APIs. Besides being problematic for not being operating system agnostic, different versions of the Linux kernel export different CPU hotplug APIs. In order to consolidate the various abstractions for different operating systems and API versions, create a CPU hotplug abstraction in QDF. Change-Id: Ib17c6e3ed3a87a90a82d909a6c493360cab27855 CRs-Fixed: 2132632
120 lines
2.8 KiB
C
120 lines
2.8 KiB
C
/*
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* Copyright (c) 2017 The Linux Foundation. All rights reserved.
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*
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* Permission to use, copy, modify, and/or distribute this software for
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* any purpose with or without fee is hereby granted, provided that the
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* above copyright notice and this permission notice appear in all
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* copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
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* WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
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* AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*/
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/**
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* DOC: qdf_cpuhp
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* This file provides OS dependent QDF CPU hotplug APIs
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*/
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#include "i_qdf_cpuhp.h"
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#include "qdf_trace.h"
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#include "linux/cpu.h"
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#include "linux/notifier.h"
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#include "linux/version.h"
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 6, 0)
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#include "linux/cpuhotplug.h"
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#endif
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static __qdf_cpuhp_emit __qdf_cpuhp_on_up;
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static __qdf_cpuhp_emit __qdf_cpuhp_on_down;
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#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 6, 0)
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static int qdf_cpuhp_legacy_handler(struct notifier_block *block,
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unsigned long state,
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void *hcpu)
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{
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unsigned long cpu = (unsigned long)hcpu;
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switch (state) {
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case CPU_ONLINE:
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__qdf_cpuhp_on_up(cpu);
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break;
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case CPU_DOWN_PREPARE:
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case CPU_DOWN_PREPARE_FROZEN:
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__qdf_cpuhp_on_down(cpu);
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break;
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default:
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break;
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}
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return NOTIFY_OK;
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}
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static struct notifier_block qdf_cpuhp_notifier_block = {
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.notifier_call = qdf_cpuhp_legacy_handler,
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};
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static inline void qdf_cpuhp_register_callbacks(void)
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{
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register_hotcpu_notifier(&qdf_cpuhp_notifier_block);
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}
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static inline void qdf_cpuhp_unregister_callbacks(void)
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{
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unregister_hotcpu_notifier(&qdf_cpuhp_notifier_block);
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}
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#else
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static enum cpuhp_state registered_hotplug_state;
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static int qdf_cpuhp_up_handler(unsigned int cpu)
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{
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__qdf_cpuhp_on_up(cpu);
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return 0;
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}
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static int qdf_cpuhp_down_handler(unsigned int cpu)
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{
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__qdf_cpuhp_on_down(cpu);
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return 0;
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}
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static inline void qdf_cpuhp_register_callbacks(void)
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{
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registered_hotplug_state = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN,
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"wlan/qca-qdf:online",
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qdf_cpuhp_up_handler,
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qdf_cpuhp_down_handler);
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}
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static inline void qdf_cpuhp_unregister_callbacks(void)
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{
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QDF_BUG(registered_hotplug_state);
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if (registered_hotplug_state)
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cpuhp_remove_state(registered_hotplug_state);
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}
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#endif /* KERNEL_VERSION(4, 6, 0) */
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void __qdf_cpuhp_os_init(__qdf_cpuhp_emit on_up, __qdf_cpuhp_emit on_down)
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{
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__qdf_cpuhp_on_up = on_up;
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__qdf_cpuhp_on_down = on_down;
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qdf_cpuhp_register_callbacks();
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}
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void __qdf_cpuhp_os_deinit(void)
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{
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qdf_cpuhp_unregister_callbacks();
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}
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