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SubjectRe: [PATCH v11 5/9] OF: Add missing I/O range exception for indirect-IO devices
Hi Zhichang,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v4.15-rc8 next-20180119]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url: https://github.com/0day-ci/linux/commits/John-Garry/LPC-legacy-ISA-I-O-support/20180121-194832
config: m68k-allyesconfig (attached as .config)
compiler: m68k-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# save the attached .config to linux build tree
make.cross ARCH=m68k

All errors (new ones prefixed by >>):

drivers//of/address.c: In function '__of_translate_address':
drivers//of/address.c:625:13: error: implicit declaration of function 'find_io_range_by_fwnode' [-Werror=implicit-function-declaration]
iorange = find_io_range_by_fwnode(&dev->fwnode);
^~~~~~~~~~~~~~~~~~~~~~~
drivers//of/address.c:625:11: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
iorange = find_io_range_by_fwnode(&dev->fwnode);
^
drivers//of/address.c:626:26: error: dereferencing pointer to incomplete type 'struct logic_pio_hwaddr'
if (iorange && (iorange->flags != PIO_CPU_MMIO)) {
^~
>> drivers//of/address.c:626:37: error: 'PIO_CPU_MMIO' undeclared (first use in this function)
if (iorange && (iorange->flags != PIO_CPU_MMIO)) {
^~~~~~~~~~~~
drivers//of/address.c:626:37: note: each undeclared identifier is reported only once for each function it appears in
drivers//of/address.c: In function 'of_translate_ioport':
drivers//of/address.c:742:10: error: implicit declaration of function 'logic_pio_trans_hwaddr' [-Werror=implicit-function-declaration]
port = logic_pio_trans_hwaddr(&host->fwnode, taddr, size);
^~~~~~~~~~~~~~~~~~~~~~
cc1: some warnings being treated as errors

vim +/PIO_CPU_MMIO +626 drivers//of/address.c

556
557 /*
558 * Translate an address from the device-tree into a CPU physical address,
559 * this walks up the tree and applies the various bus mappings on the
560 * way.
561 *
562 * Note: We consider that crossing any level with #size-cells == 0 to mean
563 * that translation is impossible (that is we are not dealing with a value
564 * that can be mapped to a cpu physical address). This is not really specified
565 * that way, but this is traditionally the way IBM at least do things
566 *
567 * Whenever the translation fails, the *host pointer will be set to the
568 * device that had registered logical PIO mapping, and the return code is
569 * relative to that node.
570 */
571 static u64 __of_translate_address(struct device_node *dev,
572 const __be32 *in_addr, const char *rprop,
573 struct device_node **host)
574 {
575 struct device_node *parent = NULL;
576 struct of_bus *bus, *pbus;
577 __be32 addr[OF_MAX_ADDR_CELLS];
578 int na, ns, pna, pns;
579 u64 result = OF_BAD_ADDR;
580
581 pr_debug("** translation for device %pOF **\n", dev);
582
583 /* Increase refcount at current level */
584 of_node_get(dev);
585
586 *host = NULL;
587 /* Get parent & match bus type */
588 parent = of_get_parent(dev);
589 if (parent == NULL)
590 goto bail;
591 bus = of_match_bus(parent);
592
593 /* Count address cells & copy address locally */
594 bus->count_cells(dev, &na, &ns);
595 if (!OF_CHECK_COUNTS(na, ns)) {
596 pr_debug("Bad cell count for %pOF\n", dev);
597 goto bail;
598 }
599 memcpy(addr, in_addr, na * 4);
600
601 pr_debug("bus is %s (na=%d, ns=%d) on %pOF\n",
602 bus->name, na, ns, parent);
603 of_dump_addr("translating address:", addr, na);
604
605 /* Translate */
606 for (;;) {
607 struct logic_pio_hwaddr *iorange;
608
609 /* Switch to parent bus */
610 of_node_put(dev);
611 dev = parent;
612 parent = of_get_parent(dev);
613
614 /* If root, we have finished */
615 if (parent == NULL) {
616 pr_debug("reached root node\n");
617 result = of_read_number(addr, na);
618 break;
619 }
620
621 /*
622 * For indirectIO device which has no ranges property, get
623 * the address from reg directly.
624 */
> 625 iorange = find_io_range_by_fwnode(&dev->fwnode);
> 626 if (iorange && (iorange->flags != PIO_CPU_MMIO)) {
627 result = of_read_number(addr + 1, na - 1);
628 pr_debug("indirectIO matched(%s) 0x%llx\n",
629 of_node_full_name(dev), result);
630 *host = of_node_get(dev);
631 break;
632 }
633
634 /* Get new parent bus and counts */
635 pbus = of_match_bus(parent);
636 pbus->count_cells(dev, &pna, &pns);
637 if (!OF_CHECK_COUNTS(pna, pns)) {
638 pr_err("Bad cell count for %pOF\n", dev);
639 break;
640 }
641
642 pr_debug("parent bus is %s (na=%d, ns=%d) on %pOF\n",
643 pbus->name, pna, pns, parent);
644
645 /* Apply bus translation */
646 if (of_translate_one(dev, bus, pbus, addr, na, ns, pna, rprop))
647 break;
648
649 /* Complete the move up one level */
650 na = pna;
651 ns = pns;
652 bus = pbus;
653
654 of_dump_addr("one level translation:", addr, na);
655 }
656 bail:
657 of_node_put(parent);
658 of_node_put(dev);
659
660 return result;
661 }
662

---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
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