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resource: add a not device managed request_free_mem_region variant 

Factor out the guts of devm_request_free_mem_region so that we can
implement both a device managed and a manually release version as tiny
wrappers around it.

Link: https://lore.kernel.org/r/20190818090557.17853-2-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Tested-by: Bharata B Rao <bharata@linux.ibm.com>
Reviewed-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
alistair/sunxi64-5.4-dsi
Christoph Hellwig 2019-08-18 11:05:54 +02:00 committed by Jason Gunthorpe
parent 8402ce61be
commit 0c38519039
2 changed files with 39 additions and 20 deletions
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2
include/linux/ioport.h
View File

@ -297,6 +297,8 @@ static inline bool resource_overlaps(struct resource *r1, struct resource *r2)
struct resource *devm_request_free_mem_region(struct device *dev,
struct resource *base, unsigned long size);
struct resource *request_free_mem_region(struct resource *base,
unsigned long size, const char *name);
#endif /* __ASSEMBLY__ */
#endif /* _LINUX_IOPORT_H */

57
kernel/resource.c
View File

@ -1644,6 +1644,34 @@ void resource_list_free(struct list_head *head)
EXPORT_SYMBOL(resource_list_free);
#ifdef CONFIG_DEVICE_PRIVATE
static struct resource *__request_free_mem_region(struct device *dev,
struct resource *base, unsigned long size, const char *name)
{
resource_size_t end, addr;
struct resource *res;
size = ALIGN(size, 1UL << PA_SECTION_SHIFT);
end = min_t(unsigned long, base->end, (1UL << MAX_PHYSMEM_BITS) - 1);
addr = end - size + 1UL;
for (; addr > size && addr >= base->start; addr -= size) {
if (region_intersects(addr, size, 0, IORES_DESC_NONE) !=
REGION_DISJOINT)
continue;
if (dev)
res = devm_request_mem_region(dev, addr, size, name);
else
res = request_mem_region(addr, size, name);
if (!res)
return ERR_PTR(-ENOMEM);
res->desc = IORES_DESC_DEVICE_PRIVATE_MEMORY;
return res;
}
return ERR_PTR(-ERANGE);
}
/**
* devm_request_free_mem_region - find free region for device private memory
*
@ -1658,28 +1686,17 @@ EXPORT_SYMBOL(resource_list_free);
struct resource *devm_request_free_mem_region(struct device *dev,
struct resource *base, unsigned long size)
{
resource_size_t end, addr;
struct resource *res;
size = ALIGN(size, 1UL << PA_SECTION_SHIFT);
end = min_t(unsigned long, base->end, (1UL << MAX_PHYSMEM_BITS) - 1);
addr = end - size + 1UL;
for (; addr > size && addr >= base->start; addr -= size) {
if (region_intersects(addr, size, 0, IORES_DESC_NONE) !=
REGION_DISJOINT)
continue;
res = devm_request_mem_region(dev, addr, size, dev_name(dev));
if (!res)
return ERR_PTR(-ENOMEM);
res->desc = IORES_DESC_DEVICE_PRIVATE_MEMORY;
return res;
}
return ERR_PTR(-ERANGE);
return __request_free_mem_region(dev, base, size, dev_name(dev));
}
EXPORT_SYMBOL_GPL(devm_request_free_mem_region);
struct resource *request_free_mem_region(struct resource *base,
unsigned long size, const char *name)
{
return __request_free_mem_region(NULL, base, size, name);
}
EXPORT_SYMBOL_GPL(request_free_mem_region);
#endif /* CONFIG_DEVICE_PRIVATE */
static int __init strict_iomem(char *str)