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Commit af5a88a3 authored by Lingutla Chandrasekhar's avatar Lingutla Chandrasekhar Committed by Gerrit - the friendly Code Review server
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soc: qcom: dump current task stack and task_struct for minidump 



Register the current stack and task_struct of all cpus to
the minidump table on panic.

Change-Id: I6906721f8c734dbf8142dc49e80dc730530f028c
Signed-off-by: default avatarLingutla Chandrasekhar <clingutla@codeaurora.org>
parent 285229fa

arch/arm64/kernel/smp.c

+2 −0
Original line number Diff line number Diff line
@@ -54,6 +54,7 @@ 
#include <asm/ptrace.h>

#include <asm/virt.h>

#include <asm/edac.h>

#include <soc/qcom/minidump.h>



#define CREATE_TRACE_POINTS

#include <trace/events/ipi.h>
@@ -740,6 +741,7 @@ static void ipi_cpu_stop(unsigned int cpu, struct pt_regs *regs) 
		pr_crit("CPU%u: stopping\n", cpu);

		show_regs(regs);

		dump_stack();

		dump_stack_minidump(regs->sp);

		arm64_check_cache_ecc(NULL);

		raw_spin_unlock(&stop_lock);

	}

drivers/soc/qcom/common_log.c

+27 −0
Original line number Diff line number Diff line
@@ -18,6 +18,7 @@ 
#include <linux/slab.h>

#include <linux/kmemleak.h>

#include <linux/async.h>

#include <linux/thread_info.h>

#include <soc/qcom/memory_dump.h>

#include <soc/qcom/minidump.h>

#include <asm/sections.h>
@@ -256,6 +257,32 @@ static void __init register_kernel_sections(void) 
	}

}



#ifdef CONFIG_QCOM_MINIDUMP

void dump_stack_minidump(u64 sp)

{

	struct md_region ksp_entry, ktsk_entry;

	u32 cpu = smp_processor_id();



	if (sp < KIMAGE_VADDR || sp > -256UL)

		sp = current_stack_pointer;



	sp &= ~(THREAD_SIZE - 1);

	scnprintf(ksp_entry.name, sizeof(ksp_entry.name), "KSTACK%d", cpu);

	ksp_entry.virt_addr = sp;

	ksp_entry.phys_addr = virt_to_phys((uintptr_t *)sp);

	ksp_entry.size = THREAD_SIZE;

	if (msm_minidump_add_region(&ksp_entry))

		pr_err("Failed to add stack of cpu %d in Minidump\n", cpu);



	scnprintf(ktsk_entry.name, sizeof(ktsk_entry.name), "KTASK%d", cpu);

	ktsk_entry.virt_addr = (u64)current;

	ktsk_entry.phys_addr = virt_to_phys((uintptr_t *)current);

	ktsk_entry.size = sizeof(struct task_struct);

	if (msm_minidump_add_region(&ktsk_entry))

		pr_err("Failed to add current task %d in Minidump\n", cpu);

}

#endif



static void __init async_common_log_init(void *data, async_cookie_t cookie)

{

	register_kernel_sections();

include/soc/qcom/minidump.h

+5 −0
Original line number Diff line number Diff line
@@ -39,11 +39,16 @@ struct md_region { 
extern int msm_minidump_add_region(const struct md_region *entry);

/* Sets to true, if minidump table is initialized */

extern bool minidump_enabled;

extern void dump_stack_minidump(u64 sp);

#else

static inline int msm_minidump_add_region(const struct md_region *entry)

{

	/* Return quietly, if minidump is not supported */

	return 0;

}



static inline void dump_stack_minidump(u64 sp) {}

#endif





#endif

kernel/panic.c

+2 −0
Original line number Diff line number Diff line
@@ -24,6 +24,7 @@ 
#include <linux/init.h>

#include <linux/nmi.h>

#include <linux/console.h>

#include <soc/qcom/minidump.h>



#define CREATE_TRACE_POINTS

#include <trace/events/exception.h>
@@ -108,6 +109,7 @@ void panic(const char *fmt, ...) 
	va_start(args, fmt);

	vsnprintf(buf, sizeof(buf), fmt, args);

	va_end(args);

	dump_stack_minidump(0);

	pr_emerg("Kernel panic - not syncing: %s\n", buf);

#ifdef CONFIG_DEBUG_BUGVERBOSE

	/*