diff options
| author | Christophe Leroy <[email protected]> | 2019-08-20 14:07:19 +0000 |
|---|---|---|
| committer | Michael Ellerman <[email protected]> | 2019-08-27 13:03:35 +1000 |
| commit | 4a45b7460cf458012a6930f675e141256b81dcf4 (patch) | |
| tree | 20eb37cd0bb73b81a000e32e811b9f4ea39c05ff /arch/powerpc/mm/ioremap.c | |
| parent | 191e42063a7241e5c3a1d1f36896a20b147517e9 (diff) | |
powerpc/mm: refactor ioremap vm area setup.
PPC32 and PPC64 are doing the same once SLAB is available.
Create a do_ioremap() function that calls get_vm_area and
do the mapping.
For PPC64, we add the 4K PFN hack sanity check to __ioremap_caller()
in order to avoid using __ioremap_at(). Other checks in __ioremap_at()
are irrelevant for __ioremap_caller().
On PPC64, VM area is allocated in the range [ioremap_bot ; IOREMAP_END]
On PPC32, VM area is allocated in the range [VMALLOC_START ; VMALLOC_END]
Lets define IOREMAP_START is ioremap_bot for PPC64, and alias
IOREMAP_START/END to VMALLOC_START/END on PPC32
Signed-off-by: Christophe Leroy <[email protected]>
Signed-off-by: Michael Ellerman <[email protected]>
Link: https://lore.kernel.org/r/42e7e36ad32e0fdf76692426cc642799c9f689b8.1566309263.git.christophe.leroy@c-s.fr
Diffstat (limited to 'arch/powerpc/mm/ioremap.c')
| -rw-r--r-- | arch/powerpc/mm/ioremap.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/arch/powerpc/mm/ioremap.c b/arch/powerpc/mm/ioremap.c index 50ee6544d0b7..57630325846c 100644 --- a/arch/powerpc/mm/ioremap.c +++ b/arch/powerpc/mm/ioremap.c @@ -80,3 +80,23 @@ int ioremap_range(unsigned long ea, phys_addr_t pa, unsigned long size, pgprot_t return 0; } + +void __iomem *do_ioremap(phys_addr_t pa, phys_addr_t offset, unsigned long size, + pgprot_t prot, void *caller) +{ + struct vm_struct *area; + int ret; + + area = __get_vm_area_caller(size, VM_IOREMAP, IOREMAP_START, IOREMAP_END, caller); + if (area == NULL) + return NULL; + + area->phys_addr = pa; + ret = ioremap_range((unsigned long)area->addr, pa, size, prot); + if (!ret) + return (void __iomem *)area->addr + offset; + + free_vm_area(area); + + return NULL; +} |