kernel/arch/powerpc/mm/ioremap_64.c, branch linux-6.2.y

powerpc/mm: Leave a gap between early allocated IO areas

2021-06-24T14:07:10Z

Vmalloc system leaves a gap between allocated areas. It helps catching overflows. Do the same for IO areas which are allocated with early_ioremap_range() until slab_is_available(). Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/c433e358190fb5d47650463ea1ab755fc7b73e6e.1618828806.git.christophe.leroy@csgroup.eu

powerpc: remove __ioremap_at and __iounmap_at

2020-06-02T17:59:10Z

These helpers are only used for remapping the ISA I/O base. Replace the mapping side with a remap_isa_range helper in isa-bridge.c that hard codes all the known arguments, and just remove __iounmap_at in favour of open coding it in the only caller. Signed-off-by: Christoph Hellwig Signed-off-by: Andrew Morton Acked-by: Peter Zijlstra (Intel) Cc: Christian Borntraeger Cc: Christophe Leroy Cc: Daniel Vetter Cc: David Airlie Cc: Gao Xiang Cc: Greg Kroah-Hartman Cc: Haiyang Zhang Cc: Johannes Weiner Cc: "K. Y. Srinivasan" Cc: Laura Abbott Cc: Mark Rutland Cc: Michael Kelley Cc: Minchan Kim Cc: Nitin Gupta Cc: Robin Murphy Cc: Sakari Ailus Cc: Stephen Hemminger Cc: Sumit Semwal Cc: Wei Liu Cc: Benjamin Herrenschmidt Cc: Catalin Marinas Cc: Heiko Carstens Cc: Paul Mackerras Cc: Vasily Gorbik Cc: Will Deacon Link: http://lkml.kernel.org/r/20200414131348.444715-8-hch@lst.de Signed-off-by: Linus Torvalds

powerpc/ioremap: warn on early use of ioremap()

2019-11-19T08:38:38Z

Powerpc now has EARLY_IOREMAP. Next step is to convert all early users of ioremap() to early_ioremap(). Add a warning to help locate those users. Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/b4f03a68ee8e68773c8973d74ec35f9c82c72871.1568295907.git.christophe.leroy@c-s.fr

powerpc/mm: split out early ioremap path.

2019-08-27T03:03:35Z

ioremap does things differently depending on whether SLAB is available or not at different levels. Try to separate the early path from the beginning. Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/3acd2dbe04b04f111475e7a59f2b6f2ab9b95ab6.1566309263.git.christophe.leroy@c-s.fr

powerpc/mm: refactor ioremap vm area setup.

2019-08-27T03:03:35Z

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 Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/42e7e36ad32e0fdf76692426cc642799c9f689b8.1566309263.git.christophe.leroy@c-s.fr

powerpc/mm: refactor ioremap_range() and use ioremap_page_range()

2019-08-27T03:03:35Z

book3s64's ioremap_range() is almost same as fallback ioremap_range(), except that it calls radix__ioremap_range() when radix is enabled. radix__ioremap_range() is also very similar to the other ones, expect that it calls ioremap_page_range when slab is available. PPC32 __ioremap_caller() have a loop doing the same thing as ioremap_range() so use it on PPC32 as well. Lets keep only one version of ioremap_range() which calls ioremap_page_range() on all platforms when slab is available. At the same time, drop the nid parameter which is not used. Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/4b1dca7096b01823b101be7338983578641547f1.1566309263.git.christophe.leroy@c-s.fr

powerpc/mm: Move ioremap functions out of pgtable_32/64.c

2019-08-27T03:03:35Z

Create ioremap_32.c and ioremap_64.c and move respective ioremap functions out of pgtable_32.c and pgtable_64.c In the meantime, fix a few comments and changes a printk() to pr_warn(). Also fix a few oversplitted lines. Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/b5c8b02ccefd4ede64c61b53cf64fb5dacb35740.1566309263.git.christophe.leroy@c-s.fr