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device-dax: Remove multi-resource infrastructure 

The multi-resource implementation anticipated discontiguous sub-division
support. That has not yet materialized, delete the infrastructure and
related code.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2017-07-14 13:54:50 -07:00
parent 93694f9630
commit 753a0850e7
5 changed files with 13 additions and 62 deletions
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4
drivers/dax/dax-private.h
View File

@ -39,14 +39,10 @@ struct dax_region {
* @region - parent region
* @dax_dev - core dax functionality
* @dev - device core
* @num_resources - number of physical address extents in this device
* @res - array of physical address ranges
*/
struct dev_dax {
struct dax_region *region;
struct dax_device *dax_dev;
struct device dev;
int num_resources;
struct resource res[0];
};
#endif

3
drivers/dax/device-dax.h
View File

@ -19,6 +19,5 @@ struct dax_region;
void dax_region_put(struct dax_region *dax_region);
struct dax_region *alloc_dax_region(struct device *parent, int region_id,
struct resource *res, unsigned int align, unsigned long flags);
struct dev_dax *devm_create_dev_dax(struct dax_region *dax_region,
int id, struct resource *res, int count);
struct dev_dax *devm_create_dev_dax(struct dax_region *dax_region, int id);
#endif /* __DEVICE_DAX_H__ */

49
drivers/dax/device.c
View File

@ -151,11 +151,7 @@ static ssize_t size_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct dev_dax *dev_dax = to_dev_dax(dev);
unsigned long long size = 0;
int i;
for (i = 0; i < dev_dax->num_resources; i++)
size += resource_size(&dev_dax->res[i]);
unsigned long long size = resource_size(&dev_dax->region->res);
return sprintf(buf, "%llu\n", size);
}
@ -224,21 +220,11 @@ static int check_vma(struct dev_dax *dev_dax, struct vm_area_struct *vma,
__weak phys_addr_t dax_pgoff_to_phys(struct dev_dax *dev_dax, pgoff_t pgoff,
unsigned long size)
{
struct resource *res;
/* gcc-4.6.3-nolibc for i386 complains that this is uninitialized */
phys_addr_t uninitialized_var(phys);
int i;
struct resource *res = &dev_dax->region->res;
phys_addr_t phys;
for (i = 0; i < dev_dax->num_resources; i++) {
res = &dev_dax->res[i];
phys = pgoff * PAGE_SIZE + res->start;
if (phys >= res->start && phys <= res->end)
break;
pgoff -= PHYS_PFN(resource_size(res));
}
if (i < dev_dax->num_resources) {
res = &dev_dax->res[i];
phys = pgoff * PAGE_SIZE + res->start;
if (phys >= res->start && phys <= res->end) {
if (phys + size - 1 <= res->end)
return phys;
}
@ -608,8 +594,7 @@ static void unregister_dev_dax(void *dev)
put_device(dev);
}
struct dev_dax *devm_create_dev_dax(struct dax_region *dax_region,
int id, struct resource *res, int count)
struct dev_dax *devm_create_dev_dax(struct dax_region *dax_region, int id)
{
struct device *parent = dax_region->dev;
struct dax_device *dax_dev;
@ -617,29 +602,12 @@ struct dev_dax *devm_create_dev_dax(struct dax_region *dax_region,
struct inode *inode;
struct device *dev;
struct cdev *cdev;
int rc, i;
int rc;
if (!count)
return ERR_PTR(-EINVAL);
dev_dax = kzalloc(struct_size(dev_dax, res, count), GFP_KERNEL);
dev_dax = kzalloc(sizeof(*dev_dax), GFP_KERNEL);
if (!dev_dax)
return ERR_PTR(-ENOMEM);
for (i = 0; i < count; i++) {
if (!IS_ALIGNED(res[i].start, dax_region->align)
|| !IS_ALIGNED(resource_size(&res[i]),
dax_region->align)) {
rc = -EINVAL;
break;
}
dev_dax->res[i].start = res[i].start;
dev_dax->res[i].end = res[i].end;
}
if (i < count)
goto err;
/*
* No 'host' or dax_operations since there is no access to this
* device outside of mmap of the resulting character device.
@ -659,7 +627,6 @@ struct dev_dax *devm_create_dev_dax(struct dax_region *dax_region,
cdev_init(cdev, &dax_fops);
cdev->owner = parent->driver->owner;
dev_dax->num_resources = count;
dev_dax->dax_dev = dax_dev;
dev_dax->region = dax_region;
kref_get(&dax_region->kref);

3
drivers/dax/pmem.c
View File

@ -129,8 +129,7 @@ static int dax_pmem_probe(struct device *dev)
if (!dax_region)
return -ENOMEM;
/* TODO: support for subdividing a dax region... */
dev_dax = devm_create_dev_dax(dax_region, id, &res, 1);
dev_dax = devm_create_dev_dax(dax_region, id);
/* child dev_dax instances now own the lifetime of the dax_region */
dax_region_put(dax_region);

16
tools/testing/nvdimm/dax-dev.c
View File

@ -17,20 +17,11 @@
phys_addr_t dax_pgoff_to_phys(struct dev_dax *dev_dax, pgoff_t pgoff,
unsigned long size)
{
struct resource *res;
struct resource *res = &dev_dax->region->res;
phys_addr_t addr;
int i;
for (i = 0; i < dev_dax->num_resources; i++) {
res = &dev_dax->res[i];
addr = pgoff * PAGE_SIZE + res->start;
if (addr >= res->start && addr <= res->end)
break;
pgoff -= PHYS_PFN(resource_size(res));
}
if (i < dev_dax->num_resources) {
res = &dev_dax->res[i];
addr = pgoff * PAGE_SIZE + res->start;
if (addr >= res->start && addr <= res->end) {
if (addr + size - 1 <= res->end) {
if (get_nfit_res(addr)) {
struct page *page;
@ -44,6 +35,5 @@ phys_addr_t dax_pgoff_to_phys(struct dev_dax *dev_dax, pgoff_t pgoff,
return addr;
}
}
return -1;
}