diff options
Diffstat (limited to 'drivers/s390')
| -rw-r--r-- | drivers/s390/block/Kconfig | 12 | ||||
| -rw-r--r-- | drivers/s390/block/dcssblk.c | 27 |
2 files changed, 27 insertions, 12 deletions
diff --git a/drivers/s390/block/Kconfig b/drivers/s390/block/Kconfig index e3710a762aba..4bfe469c04aa 100644 --- a/drivers/s390/block/Kconfig +++ b/drivers/s390/block/Kconfig @@ -4,13 +4,21 @@ comment "S/390 block device drivers" config DCSSBLK def_tristate m - select FS_DAX_LIMITED - select DAX prompt "DCSSBLK support" depends on S390 && BLOCK help Support for dcss block device +config DCSSBLK_DAX + def_bool y + depends on DCSSBLK + # requires S390 ZONE_DEVICE support + depends on BROKEN + select DAX + prompt "DCSSBLK DAX support" + help + Enable DAX operation for the dcss block device + config DASD def_tristate y prompt "Support for DASD devices" diff --git a/drivers/s390/block/dcssblk.c b/drivers/s390/block/dcssblk.c index 0f14d279d30b..7248e547fefb 100644 --- a/drivers/s390/block/dcssblk.c +++ b/drivers/s390/block/dcssblk.c @@ -534,6 +534,21 @@ static const struct attribute_group *dcssblk_dev_attr_groups[] = { NULL, }; +static int dcssblk_setup_dax(struct dcssblk_dev_info *dev_info) +{ + struct dax_device *dax_dev; + + if (!IS_ENABLED(CONFIG_DCSSBLK_DAX)) + return 0; + + dax_dev = alloc_dax(dev_info, &dcssblk_dax_ops); + if (IS_ERR(dax_dev)) + return PTR_ERR(dax_dev); + set_dax_synchronous(dax_dev); + dev_info->dax_dev = dax_dev; + return dax_add_host(dev_info->dax_dev, dev_info->gd); +} + /* * device attribute for adding devices */ @@ -547,7 +562,6 @@ dcssblk_add_store(struct device *dev, struct device_attribute *attr, const char int rc, i, j, num_of_segments; struct dcssblk_dev_info *dev_info; struct segment_info *seg_info, *temp; - struct dax_device *dax_dev; char *local_buf; unsigned long seg_byte_size; @@ -674,14 +688,7 @@ dcssblk_add_store(struct device *dev, struct device_attribute *attr, const char if (rc) goto put_dev; - dax_dev = alloc_dax(dev_info, &dcssblk_dax_ops); - if (IS_ERR(dax_dev)) { - rc = PTR_ERR(dax_dev); - goto put_dev; - } - set_dax_synchronous(dax_dev); - dev_info->dax_dev = dax_dev; - rc = dax_add_host(dev_info->dax_dev, dev_info->gd); + rc = dcssblk_setup_dax(dev_info); if (rc) goto out_dax; @@ -917,7 +924,7 @@ __dcssblk_direct_access(struct dcssblk_dev_info *dev_info, pgoff_t pgoff, *kaddr = __va(dev_info->start + offset); if (pfn) *pfn = __pfn_to_pfn_t(PFN_DOWN(dev_info->start + offset), - PFN_DEV|PFN_SPECIAL); + PFN_DEV); return (dev_sz - offset) / PAGE_SIZE; } |