diff mbox series

[2/2] sh: add support for folded p4d page tables

Message ID 20191217142150.10392-3-rppt@kernel.org (mailing list archive)
State New, archived
Headers show
Series sh: get rid of __ARCH_USE_5LEVEL_HACK | expand

Commit Message

Mike Rapoport Dec. 17, 2019, 2:21 p.m. UTC 
From: Mike Rapoport <rppt@linux.ibm.com>

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>
---
 arch/sh/include/asm/pgtable-2level.h |  1 -
 arch/sh/include/asm/pgtable-3level.h |  1 -
 arch/sh/kernel/io_trapped.c          |  7 ++++++-
 arch/sh/mm/cache-sh4.c               |  4 +++-
 arch/sh/mm/cache-sh5.c               |  7 ++++++-
 arch/sh/mm/fault.c                   | 26 +++++++++++++++++++++++---
 arch/sh/mm/hugetlbpage.c             | 28 ++++++++++++++++++----------
 arch/sh/mm/init.c                    |  9 ++++++++-
 arch/sh/mm/kmap.c                    |  2 +-
 arch/sh/mm/tlbex_32.c                |  6 +++++-
 arch/sh/mm/tlbex_64.c                |  7 ++++++-
 11 files changed, 76 insertions(+), 22 deletions(-)

Comments

Geert Uytterhoeven Dec. 17, 2019, 5:59 p.m. UTC | #1 
Hi Mike,

On Tue, Dec 17, 2019 at 3:23 PM Mike Rapoport <rppt@kernel.org> wrote:
> From: Mike Rapoport <rppt@linux.ibm.com>
>
> 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>

Thanks for your patch!

> --- a/arch/sh/mm/fault.c
> +++ b/arch/sh/mm/fault.c
> @@ -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)
> +                       printk(", *p4d=%0*Lx", (u32)(sizeof(*p4d) * 2),
> +                              (u64)p4d_val(*p4d));

This (and the prints below) is gonna cause lots of broken output lines.
You should use pr_cont() instead, and probably rebase on top of  my
"[PATCH 7/7] sh: fault: Modernize printing of kernel messages"
(https://lore.kernel.org/lkml/20191203162645.19950-8-geert+renesas@glider.be/).

> +
> +               if (p4d_none(*p4d))
> +                       break;
> +
> +               if (p4d_bad(*p4d)) {
> +                       printk("(bad)");
> +                       break;
> +               }
> +
> +               pud = pud_offset(p4d, addr);
>                 if (PTRS_PER_PUD != 1)
>                         printk(", *pud=%0*Lx", (u32)(sizeof(*pud) * 2),
>                                (u64)pud_val(*pud));

Gr{oetje,eeting}s,

                        Geert
Mike Rapoport Dec. 17, 2019, 6:32 p.m. UTC | #2 
On Tue, Dec 17, 2019 at 06:59:43PM +0100, Geert Uytterhoeven wrote:
> Hi Mike,
> 
> On Tue, Dec 17, 2019 at 3:23 PM Mike Rapoport <rppt@kernel.org> wrote:
> > From: Mike Rapoport <rppt@linux.ibm.com>
> >
> > 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>
> 
> Thanks for your patch!
> 
> > --- a/arch/sh/mm/fault.c
> > +++ b/arch/sh/mm/fault.c
> > @@ -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)
> > +                       printk(", *p4d=%0*Lx", (u32)(sizeof(*p4d) * 2),
> > +                              (u64)p4d_val(*p4d));
> 
> This (and the prints below) is gonna cause lots of broken output lines.
> You should use pr_cont() instead, and probably rebase on top of  my
> "[PATCH 7/7] sh: fault: Modernize printing of kernel messages"
> (https://lore.kernel.org/lkml/20191203162645.19950-8-geert+renesas@glider.be/).

Ok, will fix.	 

> > +
> > +               if (p4d_none(*p4d))
> > +                       break;
> > +
> > +               if (p4d_bad(*p4d)) {
> > +                       printk("(bad)");
> > +                       break;
> > +               }
> > +
> > +               pud = pud_offset(p4d, addr);
> >                 if (PTRS_PER_PUD != 1)
> >                         printk(", *pud=%0*Lx", (u32)(sizeof(*pud) * 2),
> >                                (u64)pud_val(*pud));
> 
> Gr{oetje,eeting}s,
> 
>                         Geert
> 
> -- 
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
> 
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                 -- Linus Torvalds
diff mbox series

Patch

diff --git a/arch/sh/include/asm/pgtable-2level.h b/arch/sh/include/asm/pgtable-2level.h
index bf1eb51c3ee5..08bff93927ff 100644
--- 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 779260b721ca..0f80097e5c9c 100644
--- 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 60c828a2b8a2..037aab2708b7 100644
--- 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 eee911422cf9..45943bcb7042 100644
--- 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 445b5e69b73c..442a77cc2957 100644
--- 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 5f51456f4fc7..001c9c23aa56 100644
--- 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)
 	       (u32)(sizeof(*pgd) * 2), (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)
+			printk(", *p4d=%0*Lx", (u32)(sizeof(*p4d) * 2),
+			       (u64)p4d_val(*p4d));
+
+		if (p4d_none(*p4d))
+			break;
+
+		if (p4d_bad(*p4d)) {
+			printk("(bad)");
+			break;
+		}
+
+		pud = pud_offset(p4d, addr);
 		if (PTRS_PER_PUD != 1)
 			printk(", *pud=%0*Lx", (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 960deb1f24a1..acd5652a0de3 100644
--- 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 4bce5fc4b63e..ed3fc4e5ded7 100644
--- 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 9e6b38b03cf7..0e7039137f5a 100644
--- 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 382262dc0c4b..1c53868632ee 100644
--- 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 8ff966dd0c74..0d015f7556fa 100644
--- 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;