sh: add support for folded p4d page tables

Implement primitives necessary for the 4th level folding, add walks of p4d
level where appropriate and remove usage of __ARCH_USE_5LEVEL_HACK.

Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Brian Cain <bcain@codeaurora.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Christophe Leroy <christophe.leroy@c-s.fr>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Geert Uytterhoeven <geert+renesas@glider.be>
Cc: Guan Xuetao <gxt@pku.edu.cn>
Cc: James Morse <james.morse@arm.com>
Cc: Jonas Bonn <jonas@southpole.se>
Cc: Julien Thierry <julien.thierry.kdev@gmail.com>
Cc: Ley Foon Tan <ley.foon.tan@intel.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Rich Felker <dalias@libc.org>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Stafford Horne <shorne@gmail.com>
Cc: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Will Deacon <will@kernel.org>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Link: http://lkml.kernel.org/r/20200414153455.21744-12-rppt@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/arch/sh/include/asm/pgtable-2level.h b/arch/sh/include/asm/pgtable-2level.h
index bf1eb51..08bff93 100644 (file)
--- a/arch/sh/include/asm/pgtable-2level.h
+++ b/arch/sh/include/asm/pgtable-2level.h
@@ -2,7 +2,6 @@
 #ifndef __ASM_SH_PGTABLE_2LEVEL_H
 #define __ASM_SH_PGTABLE_2LEVEL_H
 
-#define __ARCH_USE_5LEVEL_HACK
 #include <asm-generic/pgtable-nopmd.h>
 
 /*

diff --git a/arch/sh/include/asm/pgtable-3level.h b/arch/sh/include/asm/pgtable-3level.h
index 779260b..0f80097 100644 (file)
--- a/arch/sh/include/asm/pgtable-3level.h
+++ b/arch/sh/include/asm/pgtable-3level.h
@@ -2,7 +2,6 @@
 #ifndef __ASM_SH_PGTABLE_3LEVEL_H
 #define __ASM_SH_PGTABLE_3LEVEL_H
 
-#define __ARCH_USE_5LEVEL_HACK
 #include <asm-generic/pgtable-nopud.h>
 
 /*

diff --git a/arch/sh/kernel/io_trapped.c b/arch/sh/kernel/io_trapped.c
index 60c828a..037aab2 100644 (file)
--- a/arch/sh/kernel/io_trapped.c
+++ b/arch/sh/kernel/io_trapped.c
@@ -136,6 +136,7 @@ EXPORT_SYMBOL_GPL(match_trapped_io_handler);
 static struct trapped_io *lookup_tiop(unsigned long address)
 {
        pgd_t *pgd_k;
+       p4d_t *p4d_k;
        pud_t *pud_k;
        pmd_t *pmd_k;
        pte_t *pte_k;
@@ -145,7 +146,11 @@ static struct trapped_io *lookup_tiop(unsigned long address)
        if (!pgd_present(*pgd_k))
                return NULL;
 
-       pud_k = pud_offset(pgd_k, address);
+       p4d_k = p4d_offset(pgd_k, address);
+       if (!p4d_present(*p4d_k))
+               return NULL;
+
+       pud_k = pud_offset(p4d_k, address);
        if (!pud_present(*pud_k))
                return NULL;
 

diff --git a/arch/sh/mm/cache-sh4.c b/arch/sh/mm/cache-sh4.c
index eee9114..45943bc 100644 (file)
--- a/arch/sh/mm/cache-sh4.c
+++ b/arch/sh/mm/cache-sh4.c
@@ -209,6 +209,7 @@ static void sh4_flush_cache_page(void *args)
        unsigned long address, pfn, phys;
        int map_coherent = 0;
        pgd_t *pgd;
+       p4d_t *p4d;
        pud_t *pud;
        pmd_t *pmd;
        pte_t *pte;
@@ -224,7 +225,8 @@ static void sh4_flush_cache_page(void *args)
                return;
 
        pgd = pgd_offset(vma->vm_mm, address);
-       pud = pud_offset(pgd, address);
+       p4d = p4d_offset(pgd, address);
+       pud = pud_offset(p4d, address);
        pmd = pmd_offset(pud, address);
        pte = pte_offset_kernel(pmd, address);
 

diff --git a/arch/sh/mm/cache-sh5.c b/arch/sh/mm/cache-sh5.c
index 445b5e6..442a77c 100644 (file)
--- a/arch/sh/mm/cache-sh5.c
+++ b/arch/sh/mm/cache-sh5.c
@@ -383,6 +383,7 @@ static void sh64_dcache_purge_user_pages(struct mm_struct *mm,
                                unsigned long addr, unsigned long end)
 {
        pgd_t *pgd;
+       p4d_t *p4d;
        pud_t *pud;
        pmd_t *pmd;
        pte_t *pte;
@@ -397,7 +398,11 @@ static void sh64_dcache_purge_user_pages(struct mm_struct *mm,
        if (pgd_bad(*pgd))
                return;
 
-       pud = pud_offset(pgd, addr);
+       p4d = p4d_offset(pgd, addr);
+       if (p4d_none(*p4d) || p4d_bad(*p4d))
+               return;
+
+       pud = pud_offset(p4d, addr);
        if (pud_none(*pud) || pud_bad(*pud))
                return;
 

diff --git a/arch/sh/mm/fault.c b/arch/sh/mm/fault.c
index ffcdf8f..7260a1a 100644 (file)
--- a/arch/sh/mm/fault.c
+++ b/arch/sh/mm/fault.c
@@ -53,6 +53,7 @@ static void show_pte(struct mm_struct *mm, unsigned long addr)
                 (u64)pgd_val(*pgd));
 
        do {
+               p4d_t *p4d;
                pud_t *pud;
                pmd_t *pmd;
                pte_t *pte;
@@ -65,7 +66,20 @@ static void show_pte(struct mm_struct *mm, unsigned long addr)
                        break;
                }
 
-               pud = pud_offset(pgd, addr);
+               p4d = p4d_offset(pgd, addr);
+               if (PTRS_PER_P4D != 1)
+                       pr_cont(", *p4d=%0*Lx", (u32)(sizeof(*p4d) * 2),
+                               (u64)p4d_val(*p4d));
+
+               if (p4d_none(*p4d))
+                       break;
+
+               if (p4d_bad(*p4d)) {
+                       pr_cont("(bad)");
+                       break;
+               }
+
+               pud = pud_offset(p4d, addr);
                if (PTRS_PER_PUD != 1)
                        pr_cont(", *pud=%0*llx", (u32)(sizeof(*pud) * 2),
                                (u64)pud_val(*pud));
@@ -107,6 +121,7 @@ static inline pmd_t *vmalloc_sync_one(pgd_t *pgd, unsigned long address)
 {
        unsigned index = pgd_index(address);
        pgd_t *pgd_k;
+       p4d_t *p4d, *p4d_k;
        pud_t *pud, *pud_k;
        pmd_t *pmd, *pmd_k;
 
@@ -116,8 +131,13 @@ static inline pmd_t *vmalloc_sync_one(pgd_t *pgd, unsigned long address)
        if (!pgd_present(*pgd_k))
                return NULL;
 
-       pud = pud_offset(pgd, address);
-       pud_k = pud_offset(pgd_k, address);
+       p4d = p4d_offset(pgd, address);
+       p4d_k = p4d_offset(pgd_k, address);
+       if (!p4d_present(*p4d_k))
+               return NULL;
+
+       pud = pud_offset(p4d, address);
+       pud_k = pud_offset(p4d_k, address);
        if (!pud_present(*pud_k))
                return NULL;
 

diff --git a/arch/sh/mm/hugetlbpage.c b/arch/sh/mm/hugetlbpage.c
index 960deb1..acd5652 100644 (file)
--- a/arch/sh/mm/hugetlbpage.c
+++ b/arch/sh/mm/hugetlbpage.c
@@ -26,17 +26,21 @@ pte_t *huge_pte_alloc(struct mm_struct *mm,
                        unsigned long addr, unsigned long sz)
 {
        pgd_t *pgd;
+       p4d_t *p4d;
        pud_t *pud;
        pmd_t *pmd;
        pte_t *pte = NULL;
 
        pgd = pgd_offset(mm, addr);
        if (pgd) {
-               pud = pud_alloc(mm, pgd, addr);
-               if (pud) {
-                       pmd = pmd_alloc(mm, pud, addr);
-                       if (pmd)
-                               pte = pte_alloc_map(mm, pmd, addr);
+               p4d = p4d_alloc(mm, pgd, addr);
+               if (p4d) {
+                       pud = pud_alloc(mm, p4d, addr);
+                       if (pud) {
+                               pmd = pmd_alloc(mm, pud, addr);
+                               if (pmd)
+                                       pte = pte_alloc_map(mm, pmd, addr);
+                       }
                }
        }
 
@@ -47,17 +51,21 @@ pte_t *huge_pte_offset(struct mm_struct *mm,
                       unsigned long addr, unsigned long sz)
 {
        pgd_t *pgd;
+       p4d_t *p4d;
        pud_t *pud;
        pmd_t *pmd;
        pte_t *pte = NULL;
 
        pgd = pgd_offset(mm, addr);
        if (pgd) {
-               pud = pud_offset(pgd, addr);
-               if (pud) {
-                       pmd = pmd_offset(pud, addr);
-                       if (pmd)
-                               pte = pte_offset_map(pmd, addr);
+               p4d = p4d_offset(pgd, addr);
+               if (p4d) {
+                       pud = pud_offset(p4d, addr);
+                       if (pud) {
+                               pmd = pmd_offset(pud, addr);
+                               if (pmd)
+                                       pte = pte_offset_map(pmd, addr);
+                       }
                }
        }
 

diff --git a/arch/sh/mm/init.c b/arch/sh/mm/init.c
index ddeeaa5..a70ba0f 100644 (file)
--- a/arch/sh/mm/init.c
+++ b/arch/sh/mm/init.c
@@ -45,6 +45,7 @@ void __init __weak plat_mem_setup(void)
 static pte_t *__get_pte_phys(unsigned long addr)
 {
        pgd_t *pgd;
+       p4d_t *p4d;
        pud_t *pud;
        pmd_t *pmd;
 
@@ -54,7 +55,13 @@ static pte_t *__get_pte_phys(unsigned long addr)
                return NULL;
        }
 
-       pud = pud_alloc(NULL, pgd, addr);
+       p4d = p4d_alloc(NULL, pgd, addr);
+       if (unlikely(!p4d)) {
+               p4d_ERROR(*p4d);
+               return NULL;
+       }
+
+       pud = pud_alloc(NULL, p4d, addr);
        if (unlikely(!pud)) {
                pud_ERROR(*pud);
                return NULL;

diff --git a/arch/sh/mm/kmap.c b/arch/sh/mm/kmap.c
index 9e6b38b..0e70391 100644 (file)
--- a/arch/sh/mm/kmap.c
+++ b/arch/sh/mm/kmap.c
@@ -15,7 +15,7 @@
 #include <asm/cacheflush.h>
 
 #define kmap_get_fixmap_pte(vaddr)                                     \
-       pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr)), (vaddr))
+       pte_offset_kernel(pmd_offset(pud_offset(p4d_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr)), (vaddr)), vaddr)
 
 static pte_t *kmap_coherent_pte;
 

diff --git a/arch/sh/mm/tlbex_32.c b/arch/sh/mm/tlbex_32.c
index 382262d..1c53868 100644 (file)
--- a/arch/sh/mm/tlbex_32.c
+++ b/arch/sh/mm/tlbex_32.c
@@ -23,6 +23,7 @@ handle_tlbmiss(struct pt_regs *regs, unsigned long error_code,
               unsigned long address)
 {
        pgd_t *pgd;
+       p4d_t *p4d;
        pud_t *pud;
        pmd_t *pmd;
        pte_t *pte;
@@ -42,7 +43,10 @@ handle_tlbmiss(struct pt_regs *regs, unsigned long error_code,
                pgd = pgd_offset(current->mm, address);
        }
 
-       pud = pud_offset(pgd, address);
+       p4d = p4d_offset(pgd, address);
+       if (p4d_none_or_clear_bad(p4d))
+               return 1;
+       pud = pud_offset(p4d, address);
        if (pud_none_or_clear_bad(pud))
                return 1;
        pmd = pmd_offset(pud, address);

diff --git a/arch/sh/mm/tlbex_64.c b/arch/sh/mm/tlbex_64.c
index 8ff966d..0d015f7 100644 (file)
--- a/arch/sh/mm/tlbex_64.c
+++ b/arch/sh/mm/tlbex_64.c
@@ -44,6 +44,7 @@ static int handle_tlbmiss(unsigned long long protection_flags,
                          unsigned long address)
 {
        pgd_t *pgd;
+       p4d_t *p4d;
        pud_t *pud;
        pmd_t *pmd;
        pte_t *pte;
@@ -58,7 +59,11 @@ static int handle_tlbmiss(unsigned long long protection_flags,
                pgd = pgd_offset(current->mm, address);
        }
 
-       pud = pud_offset(pgd, address);
+       p4d = p4d_offset(pgd, address);
+       if (p4d_none(*p4d) || !p4d_present(*p4d))
+               return 1;
+
+       pud = pud_offset(p4d, address);
        if (pud_none(*pud) || !pud_present(*pud))
                return 1;