kernel/linux.git/arch/powerpc/include/asm/page.h, branch linux-4.4.y

powerpc/mm: Fix virt_addr_valid() etc. on 64-bit hash

2018-04-13T17:50:08+00:00

[ Upstream commit e41e53cd4fe331d0d1f06f8e4ed7e2cc63ee2c34 ] virt_addr_valid() is supposed to tell you if it's OK to call virt_to_page() on an address. What this means in practice is that it should only return true for addresses in the linear mapping which are backed by a valid PFN. We are failing to properly check that the address is in the linear mapping, because virt_to_pfn() will return a valid looking PFN for more or less any address. That bug is actually caused by __pa(), used in virt_to_pfn(). eg: __pa(0xc000000000010000) = 0x10000 # Good __pa(0xd000000000010000) = 0x10000 # Bad! __pa(0x0000000000010000) = 0x10000 # Bad! This started happening after commit bdbc29c19b26 ("powerpc: Work around gcc miscompilation of __pa() on 64-bit") (Aug 2013), where we changed the definition of __pa() to work around a GCC bug. Prior to that we subtracted PAGE_OFFSET from the value passed to __pa(), meaning __pa() of a 0xd or 0x0 address would give you something bogus back. Until we can verify if that GCC bug is no longer an issue, or come up with another solution, this commit does the minimal fix to make virt_addr_valid() work, by explicitly checking that the address is in the linear mapping region. Fixes: bdbc29c19b26 ("powerpc: Work around gcc miscompilation of __pa() on 64-bit") Signed-off-by: Michael Ellerman Reviewed-by: Paul Mackerras Reviewed-by: Balbir Singh Tested-by: Breno Leitao Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman

powerpc/booke: Only use VIRT_PHYS_OFFSET on booke32

2015-10-27T23:13:29+00:00

The way VIRT_PHYS_OFFSET is not correct on book3e-64, because it does not account for CONFIG_RELOCATABLE other than via the 32-bit-only virt_phys_offset. book3e-64 can (and if the comment about a GCC miscompilation is still relevant, should) use the normal ppc64 __va/__pa. At this point, only booke-32 will use VIRT_PHYS_OFFSET, so given the issues with its calculation, restrict its definition to booke-32. Signed-off-by: Scott Wood

powerpc/mm: Disable hugepd for 64K page size.

2015-10-12T04:29:59+00:00

After commit e2b3d202d1dba8f3546ed28224ce485bc50010be ("powerpc: Switch 16GB and 16MB explicit hugepages to a different page table format"), we don't need to support is_hugepd() for 64K page size. Signed-off-by: Aneesh Kumar K.V Signed-off-by: Michael Ellerman

powerpc: Fix _ALIGN_* errors due to type difference.

2015-10-08T21:02:25+00:00

This avoid errors like unsigned int usize = 1 << 30; int size = 1 << 30; unsigned long addr = 64UL << 30 ; value = _ALIGN_DOWN(addr, usize); -> 0 value = _ALIGN_DOWN(addr, size); -> 0x1000000000 Signed-off-by: Aneesh Kumar K.V Signed-off-by: Michael Ellerman

powerpc/mm: Add virt_to_pfn and use this instead of opencoding

2015-10-01T06:52:02+00:00

This add helper virt_to_pfn and remove the opencoded usage of the same. Signed-off-by: Aneesh Kumar K.V Signed-off-by: Michael Ellerman

powerpc: Make STRICT_MM_TYPECHECKS a config option

2015-05-11T09:53:59+00:00

The STRICT_MM_TYPECHECKS code has bit-rotted over the years. To make it possible to easily build test it, make it a CONFIG option. Signed-off-by: Michael Ellerman

powerpc/mm: Switch to generic RCU get_user_pages_fast

2014-11-14T06:24:21+00:00

This patch switch the ppc arch to use the generic RCU based gup implementation. Signed-off-by: Aneesh Kumar K.V Signed-off-by: Michael Ellerman

mm: Update generic gup implementation to handle hugepage directory

2014-11-14T06:24:21+00:00

Update generic gup implementation with powerpc specific details. On powerpc at pmd level we can have hugepte, normal pmd pointer or a pointer to the hugepage directory. Tested-by: Steve Capper Acked-by: Steve Capper Signed-off-by: Aneesh Kumar K.V Signed-off-by: Michael Ellerman

arm64,ia64,ppc,s390,sh,tile,um,x86,mm: remove default gate area

2014-08-08T22:57:27+00:00

The core mm code will provide a default gate area based on FIXADDR_USER_START and FIXADDR_USER_END if !defined(__HAVE_ARCH_GATE_AREA) && defined(AT_SYSINFO_EHDR). This default is only useful for ia64. arm64, ppc, s390, sh, tile, 64-bit UML, and x86_32 have their own code just to disable it. arm, 32-bit UML, and x86_64 have gate areas, but they have their own implementations. This gets rid of the default and moves the code into ia64. This should save some code on architectures without a gate area: it's now possible to inline the gate_area functions in the default case. Signed-off-by: Andy Lutomirski Acked-by: Nathan Lynch Acked-by: H. Peter Anvin Acked-by: Benjamin Herrenschmidt [in principle] Acked-by: Richard Weinberger [for um] Acked-by: Will Deacon [for arm64] Cc: Catalin Marinas Cc: Will Deacon Cc: Tony Luck Cc: Fenghua Yu Cc: Benjamin Herrenschmidt Cc: Paul Mackerras Cc: Martin Schwidefsky Cc: Heiko Carstens Cc: Chris Metcalf Cc: Jeff Dike Cc: Richard Weinberger Cc: Thomas Gleixner Cc: Ingo Molnar Cc: "H. Peter Anvin" Cc: Nathan Lynch Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

powerpc: Fix 64K page size support for PPC44x

2013-10-30T05:00:51+00:00

PPC44x supports page sizes other than 4K however when 64K page sizes are selected compilation fails. This is due to a change in the definition of pgtable_t introduced by the following patch: commit 5c1f6ee9a31cbdac90bbb8ae1ba4475031ac74b4 Author: Aneesh Kumar K.V powerpc: Reduce PTE table memory wastage The above patch only implements the new layout for PPC64 so it doesn't compile for PPC32 with a 64K page size. Ideally we should implement the same layout for PPC32 however for the meantime this patch reverts the definition of pgtable_t for PPC32. Signed-off-by: Alistair Popple Signed-off-by: Benjamin Herrenschmidt