err_common.c

一个2.4.21版本的嵌入式linux内核

	if (!(c_stat & EV6__C_STAT__ERRMASK))
		return MCHK_DISPOSITION_UNKNOWN_ERROR;

	if (!print)
		return status;

	source = EXTRACT(c_stat, EV6__C_STAT__SOURCE);
	stream = EXTRACT(c_stat, EV6__C_STAT__ISTREAM);
	bits = EXTRACT(c_stat, EV6__C_STAT__DOUBLE);

	if (c_stat & EV6__C_STAT__BC_PERR) {
		printk("%s    Bcache tag parity error\n", err_print_prefix);
		source = -1;
	}

	if (c_stat & EV6__C_STAT__DC_PERR) {
		printk("%s    Dcache tag parity error\n", err_print_prefix);
		source = -1;
	}

	if (c_stat == EV6__C_STAT__PROBE_BC_ERR0 ||
	    c_stat == EV6__C_STAT__PROBE_BC_ERR1) {
		printk("%s    Bcache single-bit error on a probe hit\n",
		       err_print_prefix);
		source = -1;
	}

	if (source != -1) 
		printk("%s    %s-STREAM %s-BIT ECC error from %s\n",
		       err_print_prefix,
		       streamname[stream], bitsname[bits], sourcename[source]);

	printk("%s    Address: 0x%016lx\n"
	         "    Syndrome[upper.lower]: %02lx.%02lx\n", 
	       err_print_prefix,
	       c_addr,
	       c2_syn, c1_syn);

	if (source == EV6__C_STAT__SOURCE_MEMORY ||
	    source == EV6__C_STAT__SOURCE_BCACHE) 
		printk("%s    Block status: %s%s%s%s\n",
		       err_print_prefix,
		       (c_sts & EV6__C_STS__SHARED) ? "SHARED " : "",
		       (c_sts & EV6__C_STS__DIRTY)  ? "DIRTY "  : "",
		       (c_sts & EV6__C_STS__VALID)  ? "VALID "  : "",
		       (c_sts & EV6__C_STS__PARITY) ? "PARITY " : "");
		
	return status;
}

int
ev6_process_logout_frame(struct el_common *mchk_header, int print)
{
	struct el_common_EV6_mcheck *ev6mchk = 
		(struct el_common_EV6_mcheck *)mchk_header;
	int status = MCHK_DISPOSITION_UNKNOWN_ERROR;

	status |= ev6_parse_ibox(ev6mchk->I_STAT, print);
	status |= ev6_parse_mbox(ev6mchk->MM_STAT, ev6mchk->DC_STAT, 
				 ev6mchk->C_STAT, print);
	status |= ev6_parse_cbox(ev6mchk->C_ADDR, ev6mchk->DC1_SYNDROME,
				 ev6mchk->DC0_SYNDROME, ev6mchk->C_STAT,
				 ev6mchk->C_STS, print);

	if (!print)
		return status;

	if (status != MCHK_DISPOSITION_DISMISS) {
		char *saved_err_prefix = err_print_prefix;

		/*
		 * Dump some additional information from the frame
		 */
		printk("%s    EXC_ADDR: 0x%016lx   IER_CM: 0x%016lx"
		            "   ISUM: 0x%016lx\n"
		         "    PAL_BASE: 0x%016lx   I_CTL:  0x%016lx"
		            "   PCTX: 0x%016lx\n",
		       err_print_prefix,
		       ev6mchk->EXC_ADDR, ev6mchk->IER_CM, ev6mchk->ISUM,
		       ev6mchk->PAL_BASE, ev6mchk->I_CTL, ev6mchk->PCTX);

		if (status == MCHK_DISPOSITION_UNKNOWN_ERROR) {
			printk("%s    UNKNOWN error, frame follows:\n",
			       err_print_prefix);
		} else {
			/* had decode -- downgrade print level for frame */
			err_print_prefix = KERN_NOTICE;
		}

		mchk_dump_logout_frame(mchk_header);

		err_print_prefix = saved_err_prefix;
	}

	return status;
}

void
ev6_machine_check(u64 vector, u64 la_ptr, struct pt_regs *regs)
{
	struct el_common *mchk_header = (struct el_common *)la_ptr;

	/*
	 * Sync the processor
	 */
	mb();
	draina();

	/*
	 * Parse the logout frame without printing first. If the only error(s)
	 * found are have a disposition of "dismiss", then just dismiss them
	 * and don't print any message
	 */
	if (ev6_process_logout_frame(mchk_header, 0) != 
	    MCHK_DISPOSITION_DISMISS) {
		char *saved_err_prefix = err_print_prefix;
		err_print_prefix = KERN_CRIT;

		/*
		 * Either a nondismissable error was detected or no
		 * recognized error was detected  in the logout frame 
		 * -- report the error in either case
		 */
		printk("%s*CPU %s Error (Vector 0x%x) reported on CPU %d:\n", 
		       err_print_prefix,
		       (vector == SCB_Q_PROCERR)?"Correctable":"Uncorrectable",
		       (unsigned int)vector, (int)smp_processor_id());
		
		ev6_process_logout_frame(mchk_header, 1);
		dik_show_regs(regs, NULL);

		err_print_prefix = saved_err_prefix;
	}

	/* 
	 * Release the logout frame 
	 */
	wrmces(0x7);
	mb();
}

#endif /* CONFIG_ALPHA_GENERIC || CONFIG_ALPHA_EV6 */


/*
 * Console Data Log
 */
/* Data */
static struct el_subpacket_handler *subpacket_handler_list = NULL;
static struct el_subpacket_annotation *subpacket_annotation_list = NULL;

static void
el_print_timestamp(union el_timestamp timestamp)
{
	if (timestamp.as_int)
		printk("%s  TIMESTAMP: %d/%d/%02d %d:%02d:%0d\n", 
		       err_print_prefix,
		       timestamp.b.month, timestamp.b.day,
		       timestamp.b.year, timestamp.b.hour,
		       timestamp.b.minute, timestamp.b.second);
}

static struct el_subpacket *
el_process_header_subpacket(struct el_subpacket *header)
{
	union el_timestamp timestamp;
	char *name = "UNKNOWN EVENT";
	int packet_count = 0;
	int length = 0;

	if (header->class != EL_CLASS__HEADER) {
		printk("%s** Unexpected header CLASS %d TYPE %d, aborting\n",
		       err_print_prefix,
		       header->class, header->type);
		return NULL;
	}

	switch(header->type) {
	case EL_TYPE__HEADER__SYSTEM_ERROR_FRAME:
		name = "SYSTEM ERROR";
		length = header->by_type.sys_err.frame_length;
		packet_count = 
			header->by_type.sys_err.frame_packet_count;
		timestamp.as_int = 0;
		break;
	case EL_TYPE__HEADER__SYSTEM_EVENT_FRAME:
		name = "SYSTEM EVENT";
		length = header->by_type.sys_event.frame_length;
		packet_count = 
			header->by_type.sys_event.frame_packet_count;
		timestamp = header->by_type.sys_event.timestamp;
		break;
	case EL_TYPE__HEADER__HALT_FRAME:
		name = "ERROR HALT";
		length = header->by_type.err_halt.frame_length;
		packet_count = 
			header->by_type.err_halt.frame_packet_count;
		timestamp = header->by_type.err_halt.timestamp;
		break;
	case EL_TYPE__HEADER__LOGOUT_FRAME:
		name = "LOGOUT FRAME";
		length = header->by_type.logout_header.frame_length;
		packet_count = 1;
		timestamp.as_int = 0;
		break;
	default: /* Unknown */
		printk("%s** Unknown header - CLASS %d TYPE %d, aborting\n",
		       err_print_prefix,
		       header->class, header->type);
		return NULL;		
	}

	printk("%s*** %s:\n"
	         "  CLASS %d, TYPE %d\n", 
	       err_print_prefix,
	       name,
	       header->class, header->type);
	el_print_timestamp(timestamp);
	
	/*
	 * Process the subpackets
	 */
	el_process_subpackets(header, packet_count);

	/* return the next header */
	header = (struct el_subpacket *)
		((unsigned long)header + header->length + length);
	return header;
}

static void
el_process_subpackets(struct el_subpacket *header, int packet_count)
{
	struct el_subpacket *subpacket;
	int i;

	subpacket = (struct el_subpacket *)
		((unsigned long)header + header->length);

	for (i = 0; subpacket && i < packet_count; i++) {
		printk("%sPROCESSING SUBPACKET %d\n", err_print_prefix, i);
		subpacket = el_process_subpacket(subpacket);
	}
}

static struct el_subpacket *
el_process_subpacket_reg(struct el_subpacket *header)
{
	struct el_subpacket *next = NULL;
	struct el_subpacket_handler *h = subpacket_handler_list;

	for (; h && h->class != header->class; h = h->next);
	if (h) next = h->handler(header);

	return next;
}

struct el_subpacket *
el_process_subpacket(struct el_subpacket *header)
{
	struct el_subpacket *next = NULL;

	switch(header->class) {
	case EL_CLASS__TERMINATION:
		/* Termination packet, there are no more */
		break;
	case EL_CLASS__HEADER: 
		next = el_process_header_subpacket(header);
		break;
	default:
		if (NULL == (next = el_process_subpacket_reg(header))) {
			printk("%s** Unexpected header CLASS %d TYPE %d"
			       " -- aborting.\n",
			       err_print_prefix,
			       header->class, header->type);
		}
		break;
	}

	return next;
}

void 
el_annotate_subpacket(struct el_subpacket *header)
{
	struct el_subpacket_annotation *a;
	char **annotation = NULL;

	for (a = subpacket_annotation_list; a; a = a->next) {
		if (a->class == header->class &&
		    a->type == header->type &&
		    a->revision == header->revision) {
			/*
			 * We found the annotation
			 */
			annotation = a->annotation;
			printk("%s  %s\n", err_print_prefix, a->description);
			break;
		}
	}

	mchk_dump_mem(header, header->length, annotation);
}

static void __init
cdl_process_console_data_log(int cpu, struct percpu_struct *pcpu)
{
	struct el_subpacket *header = (struct el_subpacket *)
		(IDENT_ADDR | pcpu->console_data_log_pa);
	int err;

	printk("%s******* CONSOLE DATA LOG FOR CPU %d. *******\n"
	         "*** Error(s) were logged on a previous boot\n",
	       err_print_prefix, cpu);
	
	for (err = 0; header && (header->class != EL_CLASS__TERMINATION); err++)
		header = el_process_subpacket(header);

	/* let the console know it's ok to clear the error(s) at restart */
	pcpu->console_data_log_pa = 0;

	printk("%s*** %d total error(s) logged\n"
	         "**** END OF CONSOLE DATA LOG FOR CPU %d ****\n", 
	       err_print_prefix, err, cpu);
}

void __init
cdl_check_console_data_log(void)
{
	struct percpu_struct *pcpu;
	unsigned long cpu;

	for (cpu = 0; cpu < hwrpb->nr_processors; cpu++) {
		pcpu = (struct percpu_struct *)
			((unsigned long)hwrpb + hwrpb->processor_offset 
			 + cpu * hwrpb->processor_size);
		if (pcpu->console_data_log_pa)
			cdl_process_console_data_log(cpu, pcpu);
	}

}

int __init
cdl_register_subpacket_annotation(struct el_subpacket_annotation *new)
{
	struct el_subpacket_annotation *a = subpacket_annotation_list;

	if (a == NULL) subpacket_annotation_list = new;
	else {
		for (; a->next != NULL; a = a->next) {
			if ((a->class == new->class && a->type == new->type) ||
			    a == new) {
				printk("Attempted to re-register "
				       "subpacket annotation\n");
				return -EINVAL;
			}
		}
		a->next = new;
	}
	new->next = NULL;

	return 0;
}

int __init
cdl_register_subpacket_handler(struct el_subpacket_handler *new)
{
	struct el_subpacket_handler *h = subpacket_handler_list;

	if (h == NULL) subpacket_handler_list = new;
	else {
		for (; h->next != NULL; h = h->next) {
			if (h->class == new->class || h == new) {
				printk("Attempted to re-register "
				       "subpacket handler\n");
				return -EINVAL;
			}
		}
		h->next = new;
	}
	new->next = NULL;

	return 0;
}