kernel.git/arch/powerpc/include/asm/page.h, branch linux-4.10.y

powerpc/mm: Fix little-endian 4K hugetlb

2017-01-18T00:58:50Z

When we switched to big endian page table, we never updated the hugepd format such that it can work for both big endian and little endian config. This patch series update hugepd format such that it is looked at as __be64 value in big endian page table config. This patch also switch hugepd_t.pd from signed long to unsigned long. I did update the FSL hugepd_ok check to check for the top bit instead of checking > 0. Fixes: 5dc1ef858c12 ("powerpc/mm: Use big endian Linux page tables for book3s 64") Cc: stable@vger.kernel.org # v4.7+ Signed-off-by: Aneesh Kumar K.V Signed-off-by: Michael Ellerman

powerpc/32: Remove RELOCATABLE_PPC32

2016-07-19T10:17:07Z

It is seldom used in the kernel code and can be easily replaced by either RELOCATABLE or PPC32. So there is no reason to keep a separate kernel option for this. Signed-off-by: Kevin Hao Signed-off-by: Michael Ellerman

powerpc/mm: Make 4K and 64K use pte_t for pgtable_t

2016-05-11T11:53:51Z

This patch switches 4K Linux page size config to use pte_t * type instead of struct page * for pgtable_t. This simplifies the code a lot and helps in consolidating both 64K and 4K page allocator routines. The changes should not have any impact, because we already store physical address in the upper level page table tree and that implies we already do struct page * to physical address conversion. One change to note here is we move the pgtable_page_dtor() call for nohash to pte_fragment_free_mm(). The nohash related change is due to the related changes in pgtable_64.c. Signed-off-by: Aneesh Kumar K.V Signed-off-by: Michael Ellerman

powerpc/mm: Use big endian Linux page tables for book3s 64

2016-05-01T08:32:18Z

Traditionally Power server machines have used the Hashed Page Table MMU mode. In this mode Linux manages its own tree of nested page tables, aka. "the Linux page tables", which are not used by the hardware directly, and software loads translations into the hash page table for use by the hardware. Power ISA 3.0 defines a new MMU mode, known as Radix Tree Translation, where the hardware can directly operate on the Linux page tables. However the hardware requires that the page tables be in big endian format. To accommodate this, switch the pgtable types to __be64 and add appropriate endian conversions. Because we will be supporting a single kernel binary that boots using either radix or hash mode, we always store the Linux page tables big endian, even in hash mode where they are not actually used by the hardware. Signed-off-by: Aneesh Kumar K.V [mpe: Fix sparse errors, flesh out change log] Signed-off-by: Michael Ellerman

powerpc/mm: Split pgtable types to separate header

2016-03-03T05:47:01Z

We move the page table accessors into a separate header. We will later add a big endian variant of the table which is needed for radix. No functionality change only code movement. Reviewed-by: Paul Mackerras Signed-off-by: Aneesh Kumar K.V Signed-off-by: Michael Ellerman

powerpc/mm/book3s-64: Use physical addresses in upper page table tree levels

2016-02-29T09:34:34Z

This changes the Linux page tables to store physical addresses rather than kernel virtual addresses in the upper levels of the tree (pgd, pud and pmd) for 64-bit Book 3S machines. This also changes the hugepd pointers used to implement hugepages when the base page size is 4k to store physical addresses rather than virtual addresses (again just for 64-bit Book3S machines). This frees up some high order bits, and will be needed with PowerISA v3.0 machines which read the page table tree in hardware in radix mode. Signed-off-by: Paul Mackerras Signed-off-by: Michael Ellerman

powerpc/mm: Move hugetlb related headers

2015-12-14T04:19:13Z

W.r.t hugetlb, we support two format for pmd. With book3s_64 and 64K linux page size, we can have pte at the pmd level. Hence we don't need to support hugepd there. For everything else hugepd is supported and pmd_huge is (0). Acked-by: Scott Wood Signed-off-by: Aneesh Kumar K.V Signed-off-by: Michael Ellerman

powerpc/mm: Don't use pmd_val, pud_val and pgd_val as lvalue

2015-12-14T04:19:07Z

We convert them static inline function here as we did with pte_val in the previous patch Acked-by: Scott Wood Signed-off-by: Aneesh Kumar K.V Signed-off-by: Michael Ellerman

powerpc/mm: Don't use pte_val as lvalue

2015-12-14T04:19:07Z

We also convert few #define to static inline in this patch for better type checking Acked-by: Scott Wood Signed-off-by: Aneesh Kumar K.V Signed-off-by: Michael Ellerman

powerpc/booke: Only use VIRT_PHYS_OFFSET on booke32

2015-10-27T23:13:29Z

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