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Commit 98a16cd3 authored by Sanrio Alvares's avatar Sanrio Alvares
Browse files

soc: qcom: msm_rtb: Add support for hotplug RTB logging 



Hotplug events are particularly interesting from system
point of view and tracing around the hotplug events would
provide essential information that could be used to debug
system issues.

Change-Id: I23e9539a76e04e222a0a05f27be51cb726ab6c33
Signed-off-by: default avatarSanrio Alvares <salvares@codeaurora.org>
parent 7427cd00

drivers/soc/qcom/Makefile

+1 −0
Original line number Original line Diff line number Diff line
@@ -89,3 +89,4 @@ obj-$(CONFIG_MSM_PACMAN) += msm_pacman.o 
obj-$(CONFIG_MSM_QBT1000) += qbt1000.o

obj-$(CONFIG_MSM_QBT1000) += qbt1000.o

obj-$(CONFIG_MSM_SCM_XPU) += scm-xpu.o

obj-$(CONFIG_MSM_SCM_XPU) += scm-xpu.o

obj-$(CONFIG_MSM_KERNEL_PROTECT) += kernel_protect.o

obj-$(CONFIG_MSM_KERNEL_PROTECT) += kernel_protect.o

obj-$(CONFIG_MSM_RTB) += msm_rtb-hotplug.o

drivers/soc/qcom/msm_rtb-hotplug.c

0 → 100644
+55 −0
Original line number Original line Diff line number Diff line 
/*

 *  Copyright (c) 2011-2015, The Linux Foundation. All rights reserved.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 */

#include <linux/cpu.h>

#include <linux/notifier.h>

#include <linux/msm_rtb.h>



#define CPU_SHIFT	0

#define CPU_MASK	0xF

#define CPU_OF(n)	(((n) & CPU_MASK) << CPU_SHIFT)

#define CPUSET_SHIFT	4

#define CPUSET_MASK	0xFFFF

#define CPUSET_OF(n)	(((n) & CPUSET_MASK) << CPUSET_SHIFT)



static int hotplug_rtb_callback(struct notifier_block *nfb,

				unsigned long action, void *hcpu)

{

	/*

	 * Bits [19:4] of the data are the online mask, lower 4 bits are the

	 * cpu number that is being changed. Additionally, changes to the

	 * online_mask that will be done by the current hotplug will be made

	 * even though they aren't necessarily in the online mask yet.

	 *

	 * XXX: This design is limited to supporting at most 16 cpus

	 */

	unsigned long this_cpumask = CPUSET_OF(1 << (unsigned long)hcpu);

	unsigned long cpumask = CPUSET_OF(cpumask_bits(cpu_online_mask)[0]);

	unsigned long cpudata = CPU_OF((unsigned long)hcpu) | cpumask;



	switch (action & (~CPU_TASKS_FROZEN)) {

	case CPU_STARTING:

		uncached_logk(LOGK_HOTPLUG, (void *)(cpudata | this_cpumask));

		break;

	case CPU_DYING:

		uncached_logk(LOGK_HOTPLUG, (void *)(cpudata & ~this_cpumask));

		break;

	default:

		break;

	}



	return NOTIFY_OK;

}

static struct notifier_block hotplug_rtb_notifier = {

	.notifier_call = hotplug_rtb_callback,

};



static int __init init_hotplug_rtb(void)

{

	return register_hotcpu_notifier(&hotplug_rtb_notifier);

}

early_initcall(init_hotplug_rtb);