From: Thomas Gleixner tglx@linutronix.de
No more users. Get rid of it and remove the traces in documentation.
Signed-off-by: Thomas Gleixner tglx@linutronix.de Cc: Andrew Morton akpm@linux-foundation.org Cc: linux-mm@kvack.org --- Documentation/driver-api/io-mapping.rst | 22 +++++----------- include/linux/io-mapping.h | 42 +------------------------------- 2 files changed, 9 insertions(+), 55 deletions(-)
--- a/Documentation/driver-api/io-mapping.rst +++ b/Documentation/driver-api/io-mapping.rst @@ -21,19 +21,15 @@ mappable, while 'size' indicates how lar enable. Both are in bytes.
This _wc variant provides a mapping which may only be used with -io_mapping_map_atomic_wc(), io_mapping_map_local_wc() or -io_mapping_map_wc(). +io_mapping_map_local_wc() or io_mapping_map_wc().
With this mapping object, individual pages can be mapped either temporarily or long term, depending on the requirements. Of course, temporary maps are -more efficient. They come in two flavours:: +more efficient.
void *io_mapping_map_local_wc(struct io_mapping *mapping, unsigned long offset)
- void *io_mapping_map_atomic_wc(struct io_mapping *mapping, - unsigned long offset) - 'offset' is the offset within the defined mapping region. Accessing addresses beyond the region specified in the creation function yields undefined results. Using an offset which is not page aligned yields an @@ -50,9 +46,6 @@ io_mapping_map_local_wc() has a side eff migration to make the mapping code work. No caller can rely on this side effect.
-io_mapping_map_atomic_wc() has the side effect of disabling preemption and -pagefaults. Don't use in new code. Use io_mapping_map_local_wc() instead. - Nested mappings need to be undone in reverse order because the mapping code uses a stack for keeping track of them::
@@ -65,11 +58,10 @@ Nested mappings need to be undone in rev The mappings are released with::
void io_mapping_unmap_local(void *vaddr) - void io_mapping_unmap_atomic(void *vaddr)
-'vaddr' must be the value returned by the last io_mapping_map_local_wc() or -io_mapping_map_atomic_wc() call. This unmaps the specified mapping and -undoes the side effects of the mapping functions. +'vaddr' must be the value returned by the last io_mapping_map_local_wc() +call. This unmaps the specified mapping and undoes eventual side effects of +the mapping function.
If you need to sleep while holding a mapping, you can use the regular variant, although this may be significantly slower:: @@ -77,8 +69,8 @@ If you need to sleep while holding a map void *io_mapping_map_wc(struct io_mapping *mapping, unsigned long offset)
-This works like io_mapping_map_atomic/local_wc() except it has no side -effects and the pointer is globaly visible. +This works like io_mapping_map_local_wc() except it has no side effects and +the pointer is globaly visible.
The mappings are released with::
--- a/include/linux/io-mapping.h +++ b/include/linux/io-mapping.h @@ -60,28 +60,7 @@ io_mapping_fini(struct io_mapping *mappi iomap_free(mapping->base, mapping->size); }
-/* Atomic map/unmap */ -static inline void __iomem * -io_mapping_map_atomic_wc(struct io_mapping *mapping, - unsigned long offset) -{ - resource_size_t phys_addr; - - BUG_ON(offset >= mapping->size); - phys_addr = mapping->base + offset; - preempt_disable(); - pagefault_disable(); - return __iomap_local_pfn_prot(PHYS_PFN(phys_addr), mapping->prot); -} - -static inline void -io_mapping_unmap_atomic(void __iomem *vaddr) -{ - kunmap_local_indexed((void __force *)vaddr); - pagefault_enable(); - preempt_enable(); -} - +/* Temporary mappings which are only valid in the current context */ static inline void __iomem * io_mapping_map_local_wc(struct io_mapping *mapping, unsigned long offset) { @@ -163,24 +142,7 @@ io_mapping_unmap(void __iomem *vaddr) { }
-/* Atomic map/unmap */ -static inline void __iomem * -io_mapping_map_atomic_wc(struct io_mapping *mapping, - unsigned long offset) -{ - preempt_disable(); - pagefault_disable(); - return io_mapping_map_wc(mapping, offset, PAGE_SIZE); -} - -static inline void -io_mapping_unmap_atomic(void __iomem *vaddr) -{ - io_mapping_unmap(vaddr); - pagefault_enable(); - preempt_enable(); -} - +/* Temporary mappings which are only valid in the current context */ static inline void __iomem * io_mapping_map_local_wc(struct io_mapping *mapping, unsigned long offset) {