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| author | Christophe Leroy <christophe.leroy@c-s.fr> | 2019-08-20 14:07:19 +0000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2019-08-27 13:03:35 +1000 |
| commit | 4a45b7460cf458012a6930f675e141256b81dcf4 (patch) | |
| tree | 20eb37cd0bb73b81a000e32e811b9f4ea39c05ff /arch/powerpc/include/asm/nohash | |
| parent | 191e42063a7241e5c3a1d1f36896a20b147517e9 (diff) | |
| download | linux-4a45b7460cf458012a6930f675e141256b81dcf4.tar.gz linux-4a45b7460cf458012a6930f675e141256b81dcf4.tar.bz2 linux-4a45b7460cf458012a6930f675e141256b81dcf4.zip | |
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 <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/42e7e36ad32e0fdf76692426cc642799c9f689b8.1566309263.git.christophe.leroy@c-s.fr
Diffstat (limited to 'arch/powerpc/include/asm/nohash')
| -rw-r--r-- | arch/powerpc/include/asm/nohash/32/pgtable.h | 4 | ||||
| -rw-r--r-- | arch/powerpc/include/asm/nohash/64/pgtable.h | 1 |
2 files changed, 5 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/nohash/32/pgtable.h b/arch/powerpc/include/asm/nohash/32/pgtable.h index 7ce2a7c9fade..3e1a4c1e40f0 100644 --- a/arch/powerpc/include/asm/nohash/32/pgtable.h +++ b/arch/powerpc/include/asm/nohash/32/pgtable.h @@ -93,6 +93,10 @@ int map_kernel_page(unsigned long va, phys_addr_t pa, pgprot_t prot); #define IOREMAP_TOP KVIRT_TOP #endif +/* PPC32 shares vmalloc area with ioremap */ +#define IOREMAP_START VMALLOC_START +#define IOREMAP_END VMALLOC_END + /* * Just any arbitrary offset to the start of the vmalloc VM area: the * current 16MB value just means that there will be a 64MB "hole" after the diff --git a/arch/powerpc/include/asm/nohash/64/pgtable.h b/arch/powerpc/include/asm/nohash/64/pgtable.h index b9f66cf15c31..9a33b8bd842d 100644 --- a/arch/powerpc/include/asm/nohash/64/pgtable.h +++ b/arch/powerpc/include/asm/nohash/64/pgtable.h @@ -53,6 +53,7 @@ #define PHB_IO_BASE (ISA_IO_END) #define PHB_IO_END (KERN_IO_START + FULL_IO_SIZE) #define IOREMAP_BASE (PHB_IO_END) +#define IOREMAP_START (ioremap_bot) #define IOREMAP_END (KERN_VIRT_START + KERN_VIRT_SIZE) |