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SubjectRe: [PATCH 15/52] fuse: map virtio_fs DAX window BAR
Hi Stefan,

I love your patch! Yet something to improve:

[auto build test ERROR on fuse/for-next]
[also build test ERROR on v4.20-rc6]
[cannot apply to next-20181213]
[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/Vivek-Goyal/virtio-fs-shared-file-system-for-virtual-machines/20181211-103034
base: https://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse.git for-next
config: sh-allmodconfig (attached as .config)
compiler: sh4-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
GCC_VERSION=7.2.0 make.cross ARCH=sh

All errors (new ones prefixed by >>):

fs/fuse/virtio_fs.c: In function 'virtio_fs_setup_dax':
>> fs/fuse/virtio_fs.c:465:8: error: implicit declaration of function 'pcim_enable_device'; did you mean 'pci_enable_device'? [-Werror=implicit-function-declaration]
ret = pcim_enable_device(pci_dev);
^~~~~~~~~~~~~~~~~~
pci_enable_device
>> fs/fuse/virtio_fs.c:470:8: error: implicit declaration of function 'pci_request_region'; did you mean 'pci_request_regions'? [-Werror=implicit-function-declaration]
ret = pci_request_region(pci_dev, VIRTIO_FS_WINDOW_BAR,
^~~~~~~~~~~~~~~~~~
pci_request_regions
In file included from include/linux/printk.h:336:0,
from include/linux/kernel.h:14,
from include/linux/list.h:9,
from include/linux/wait.h:7,
from include/linux/wait_bit.h:8,
from include/linux/fs.h:6,
from fs/fuse/virtio_fs.c:7:
fs/fuse/virtio_fs.c:528:22: warning: format '%llx' expects argument of type 'long long unsigned int', but argument 6 has type 'phys_addr_t {aka unsigned int}' [-Wformat=]
dev_dbg(&vdev->dev, "%s: window kaddr 0x%px phys_addr 0x%llx len %zu\n",
^
include/linux/dynamic_debug.h:135:39: note: in definition of macro 'dynamic_dev_dbg'
__dynamic_dev_dbg(&descriptor, dev, fmt, \
^~~
include/linux/device.h:1463:23: note: in expansion of macro 'dev_fmt'
dynamic_dev_dbg(dev, dev_fmt(fmt), ##__VA_ARGS__)
^~~~~~~
fs/fuse/virtio_fs.c:528:2: note: in expansion of macro 'dev_dbg'
dev_dbg(&vdev->dev, "%s: window kaddr 0x%px phys_addr 0x%llx len %zu\n",
^~~~~~~
At top level:
fs/fuse/virtio_fs.c:604:12: warning: 'virtio_fs_restore' defined but not used [-Wunused-function]
static int virtio_fs_restore(struct virtio_device *vdev)
^~~~~~~~~~~~~~~~~
fs/fuse/virtio_fs.c:599:12: warning: 'virtio_fs_freeze' defined but not used [-Wunused-function]
static int virtio_fs_freeze(struct virtio_device *vdev)
^~~~~~~~~~~~~~~~
cc1: some warnings being treated as errors

vim +465 fs/fuse/virtio_fs.c

445
446 static int virtio_fs_setup_dax(struct virtio_device *vdev, struct virtio_fs *fs)
447 {
448 struct virtio_fs_memremap_info *mi;
449 struct dev_pagemap *pgmap;
450 struct pci_dev *pci_dev;
451 phys_addr_t phys_addr;
452 size_t len;
453 int ret;
454
455 if (!IS_ENABLED(CONFIG_DAX_DRIVER))
456 return 0;
457
458 /* HACK implement VIRTIO shared memory regions instead of
459 * directly accessing the PCI BAR from a virtio device driver.
460 */
461 pci_dev = container_of(vdev->dev.parent, struct pci_dev, dev);
462
463 /* TODO Is this safe - the virtio_pci_* driver doesn't use managed
464 * device APIs? */
> 465 ret = pcim_enable_device(pci_dev);
466 if (ret < 0)
467 return ret;
468
469 /* TODO handle case where device doesn't expose BAR? */
> 470 ret = pci_request_region(pci_dev, VIRTIO_FS_WINDOW_BAR,
471 "virtio-fs-window");
472 if (ret < 0) {
473 dev_err(&vdev->dev, "%s: failed to request window BAR\n",
474 __func__);
475 return ret;
476 }
477
478 phys_addr = pci_resource_start(pci_dev, VIRTIO_FS_WINDOW_BAR);
479 len = pci_resource_len(pci_dev, VIRTIO_FS_WINDOW_BAR);
480
481 mi = devm_kzalloc(&pci_dev->dev, sizeof(*mi), GFP_KERNEL);
482 if (!mi)
483 return -ENOMEM;
484
485 init_completion(&mi->completion);
486 ret = percpu_ref_init(&mi->ref, virtio_fs_percpu_release, 0,
487 GFP_KERNEL);
488 if (ret < 0) {
489 dev_err(&vdev->dev, "%s: percpu_ref_init failed (%d)\n",
490 __func__, ret);
491 return ret;
492 }
493
494 ret = devm_add_action(&pci_dev->dev, virtio_fs_percpu_exit, mi);
495 if (ret < 0) {
496 percpu_ref_exit(&mi->ref);
497 return ret;
498 }
499
500 pgmap = &mi->pgmap;
501 pgmap->altmap_valid = false;
502 pgmap->ref = &mi->ref;
503 pgmap->type = MEMORY_DEVICE_FS_DAX;
504
505 /* Ideally we would directly use the PCI BAR resource but
506 * devm_memremap_pages() wants its own copy in pgmap. So
507 * initialize a struct resource from scratch (only the start
508 * and end fields will be used).
509 */
510 pgmap->res = (struct resource){
511 .name = "virtio-fs dax window",
512 .start = phys_addr,
513 .end = phys_addr + len,
514 };
515
516 fs->window_kaddr = devm_memremap_pages(&pci_dev->dev, pgmap);
517 if (IS_ERR(fs->window_kaddr))
518 return PTR_ERR(fs->window_kaddr);
519
520 ret = devm_add_action_or_reset(&pci_dev->dev, virtio_fs_percpu_kill,
521 &mi->ref);
522 if (ret < 0)
523 return ret;
524
525 fs->window_phys_addr = phys_addr;
526 fs->window_len = len;
527
528 dev_dbg(&vdev->dev, "%s: window kaddr 0x%px phys_addr 0x%llx len %zu\n",
529 __func__, fs->window_kaddr, phys_addr, len);
530
531 fs->dax_dev = alloc_dax(fs, NULL, &virtio_fs_dax_ops);
532 if (!fs->dax_dev)
533 return -ENOMEM;
534
535 return devm_add_action_or_reset(&vdev->dev, virtio_fs_cleanup_dax, fs);
536 }
537

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