From 6b0e82791bd03b2326c7f7d8c1124c825742f2a4 Mon Sep 17 00:00:00 2001 From: Christophe Leroy Date: Tue, 2 Jul 2024 15:51:28 +0200 Subject: [PATCH] powerpc/e500: switch to 64 bits PGD on 85xx (32 bits) At the time being when CONFIG_PTE_64BIT is selected, PTE entries are 64 bits but PGD entries are still 32 bits. In order to allow leaf PMD entries, switch the PGD to 64 bits entries. Link: https://lkml.kernel.org/r/ca85397df02564e5edc3a3c27b55cf43af3e4ef3.1719928057.git.christophe.leroy@csgroup.eu Signed-off-by: Christophe Leroy Cc: Jason Gunthorpe Cc: Michael Ellerman Cc: Nicholas Piggin Cc: Oscar Salvador Cc: Peter Xu Signed-off-by: Andrew Morton --- arch/powerpc/include/asm/pgtable-types.h | 4 ++++ arch/powerpc/kernel/head_85xx.S | 10 ++++++---- 2 files changed, 10 insertions(+), 4 deletions(-) diff --git a/arch/powerpc/include/asm/pgtable-types.h b/arch/powerpc/include/asm/pgtable-types.h index 082c85cc09b1..db965d98e0ae 100644 --- a/arch/powerpc/include/asm/pgtable-types.h +++ b/arch/powerpc/include/asm/pgtable-types.h @@ -49,7 +49,11 @@ static inline unsigned long pud_val(pud_t x) #endif /* CONFIG_PPC64 */ /* PGD level */ +#if defined(CONFIG_PPC_E500) && defined(CONFIG_PTE_64BIT) +typedef struct { unsigned long long pgd; } pgd_t; +#else typedef struct { unsigned long pgd; } pgd_t; +#endif #define __pgd(x) ((pgd_t) { (x) }) static inline unsigned long pgd_val(pgd_t x) { diff --git a/arch/powerpc/kernel/head_85xx.S b/arch/powerpc/kernel/head_85xx.S index 39724ff5ae1f..a305244afc9f 100644 --- a/arch/powerpc/kernel/head_85xx.S +++ b/arch/powerpc/kernel/head_85xx.S @@ -307,8 +307,9 @@ set_ivor: #ifdef CONFIG_PTE_64BIT #ifdef CONFIG_HUGETLB_PAGE #define FIND_PTE \ - rlwinm r12, r10, 13, 19, 29; /* Compute pgdir/pmd offset */ \ - lwzx r11, r12, r11; /* Get pgd/pmd entry */ \ + rlwinm r12, r10, 14, 18, 28; /* Compute pgdir/pmd offset */ \ + add r12, r11, r12; \ + lwz r11, 4(r12); /* Get pgd/pmd entry */ \ rlwinm. r12, r11, 0, 0, 20; /* Extract pt base address */ \ blt 1000f; /* Normal non-huge page */ \ beq 2f; /* Bail if no table */ \ @@ -321,8 +322,9 @@ set_ivor: 1001: lwz r11, 4(r12); /* Get pte entry */ #else #define FIND_PTE \ - rlwinm r12, r10, 13, 19, 29; /* Compute pgdir/pmd offset */ \ - lwzx r11, r12, r11; /* Get pgd/pmd entry */ \ + rlwinm r12, r10, 14, 18, 28; /* Compute pgdir/pmd offset */ \ + add r12, r11, r12; \ + lwz r11, 4(r12); /* Get pgd/pmd entry */ \ rlwinm. r12, r11, 0, 0, 20; /* Extract pt base address */ \ beq 2f; /* Bail if no table */ \ rlwimi r12, r10, 23, 20, 28; /* Compute pte address */ \