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: Lingutla Chandrasekhar <clingutla@codeaurora.org>

arch/arm64/kernel/smp.c

@@ -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

@@ -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

@@ -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

@@ -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
 	/*