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authorPaul Mackerras <paulus@ozlabs.org>2016-09-02 09:20:43 +0200
committerPaul Mackerras <paulus@ozlabs.org>2016-09-09 08:14:48 +0200
commit0eeede0c63305a33de31bd90b53b023c1d452c17 (patch)
tree32ae6883786e58c5e9b6fc9886cf8cea9590da79 /arch/powerpc/include/asm/mmu.h
parentLinux 4.8-rc2 (diff)
downloadlinux-0eeede0c63305a33de31bd90b53b023c1d452c17.tar.xz
linux-0eeede0c63305a33de31bd90b53b023c1d452c17.zip
powerpc/mm: Speed up computation of base and actual page size for a HPTE
This replaces a 2-D search through an array with a simple 8-bit table lookup for determining the actual and/or base page size for a HPT entry. The encoding in the second doubleword of the HPTE is designed to encode the actual and base page sizes without using any more bits than would be needed for a 4k page number, by using between 1 and 8 low-order bits of the RPN (real page number) field to encode the page sizes. A single "large page" bit in the first doubleword indicates that these low-order bits are to be interpreted like this. We can determine the page sizes by using the low-order 8 bits of the RPN to look up a 256-entry table. For actual page sizes less than 1MB, some of the upper bits of these 8 bits are going to be real address bits, but we can cope with that by replicating the entries for those smaller page sizes. While we're at it, let's move the hpte_page_size() and hpte_base_page_size() functions from a KVM-specific header to a header for 64-bit HPT systems, since this computation doesn't have anything specifically to do with KVM. Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
Diffstat (limited to 'arch/powerpc/include/asm/mmu.h')
-rw-r--r--arch/powerpc/include/asm/mmu.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/mmu.h b/arch/powerpc/include/asm/mmu.h
index e2fb408f8398..b78e8d3377f6 100644
--- a/arch/powerpc/include/asm/mmu.h
+++ b/arch/powerpc/include/asm/mmu.h
@@ -271,6 +271,7 @@ static inline bool early_radix_enabled(void)
#define MMU_PAGE_16G 13
#define MMU_PAGE_64G 14
+/* N.B. we need to change the type of hpte_page_sizes if this gets to be > 16 */
#define MMU_PAGE_COUNT 15
#ifdef CONFIG_PPC_BOOK3S_64