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powerpc: add support for folded p4d page tables

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Implement primitives necessary for the 4th level folding, add walks of p4d
level where appropriate and replace 5level-fixup.h with pgtable-nop4d.h.

[rppt@linux.ibm.com: powerpc/xmon: drop unused pgdir varialble in show_pte() function]
  Link: http://lkml.kernel.org/r/20200519181454.GI1059226@linux.ibm.com
[rppt@linux.ibm.com; build fix]
  Link: http://lkml.kernel.org/r/20200423141845.GI13521@linux.ibm.com
Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Tested-by: Christophe Leroy <christophe.leroy@c-s.fr> # 8xx and 83xx
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: 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/20200414153455.21744-9-rppt@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mike Rapoport
2020-06-04 16:46:44 -07:00
committed by Linus Torvalds
parent b187fb7fca
commit 2fb4706057
23 changed files with 201 additions and 146 deletions
Download Patch File Download Diff File Expand all files Collapse all files

30
arch/powerpc/mm/pgtable.c
View File

@@ -265,6 +265,7 @@ int huge_ptep_set_access_flags(struct vm_area_struct *vma,
void assert_pte_locked(struct mm_struct *mm, unsigned long addr)
{
pgd_t *pgd;
p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
@@ -272,7 +273,9 @@ void assert_pte_locked(struct mm_struct *mm, unsigned long addr)
return;
pgd = mm->pgd + pgd_index(addr);
BUG_ON(pgd_none(*pgd));
pud = pud_offset(pgd, addr);
p4d = p4d_offset(pgd, addr);
BUG_ON(p4d_none(*p4d));
pud = pud_offset(p4d, addr);
BUG_ON(pud_none(*pud));
pmd = pmd_offset(pud, addr);
/*
@@ -312,12 +315,13 @@ EXPORT_SYMBOL_GPL(vmalloc_to_phys);
pte_t *__find_linux_pte(pgd_t *pgdir, unsigned long ea,
bool *is_thp, unsigned *hpage_shift)
{
pgd_t pgd, *pgdp;
pgd_t *pgdp;
p4d_t p4d, *p4dp;
pud_t pud, *pudp;
pmd_t pmd, *pmdp;
pte_t *ret_pte;
hugepd_t *hpdp = NULL;
unsigned pdshift = PGDIR_SHIFT;
unsigned pdshift;
if (hpage_shift)
*hpage_shift = 0;
@@ -325,24 +329,28 @@ pte_t *__find_linux_pte(pgd_t *pgdir, unsigned long ea,
if (is_thp)
*is_thp = false;
pgdp = pgdir + pgd_index(ea);
pgd = READ_ONCE(*pgdp);
/*
* Always operate on the local stack value. This make sure the
* value don't get updated by a parallel THP split/collapse,
* page fault or a page unmap. The return pte_t * is still not
* stable. So should be checked there for above conditions.
* Top level is an exception because it is folded into p4d.
*/
if (pgd_none(pgd))
pgdp = pgdir + pgd_index(ea);
p4dp = p4d_offset(pgdp, ea);
p4d = READ_ONCE(*p4dp);
pdshift = P4D_SHIFT;
if (p4d_none(p4d))
return NULL;
if (pgd_is_leaf(pgd)) {
ret_pte = (pte_t *)pgdp;
if (p4d_is_leaf(p4d)) {
ret_pte = (pte_t *)p4dp;
goto out;
}
if (is_hugepd(__hugepd(pgd_val(pgd)))) {
hpdp = (hugepd_t *)&pgd;
if (is_hugepd(__hugepd(p4d_val(p4d)))) {
hpdp = (hugepd_t *)&p4d;
goto out_huge;
}
@@ -352,7 +360,7 @@ pte_t *__find_linux_pte(pgd_t *pgdir, unsigned long ea,
* irq disabled
*/
pdshift = PUD_SHIFT;
pudp = pud_offset(&pgd, ea);
pudp = pud_offset(&p4d, ea);
pud = READ_ONCE(*pudp);
if (pud_none(pud))