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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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e31cf2f4ca
Patch series "mm: consolidate definitions of page table accessors", v2. The low level page table accessors (pXY_index(), pXY_offset()) are duplicated across all architectures and sometimes more than once. For instance, we have 31 definition of pgd_offset() for 25 supported architectures. Most of these definitions are actually identical and typically it boils down to, e.g. static inline unsigned long pmd_index(unsigned long address) { return (address >> PMD_SHIFT) & (PTRS_PER_PMD - 1); } static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address) { return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address); } These definitions can be shared among 90% of the arches provided XYZ_SHIFT, PTRS_PER_XYZ and xyz_page_vaddr() are defined. For architectures that really need a custom version there is always possibility to override the generic version with the usual ifdefs magic. These patches introduce include/linux/pgtable.h that replaces include/asm-generic/pgtable.h and add the definitions of the page table accessors to the new header. This patch (of 12): The linux/mm.h header includes <asm/pgtable.h> to allow inlining of the functions involving page table manipulations, e.g. pte_alloc() and pmd_alloc(). So, there is no point to explicitly include <asm/pgtable.h> in the files that include <linux/mm.h>. The include statements in such cases are remove with a simple loop: for f in $(git grep -l "include <linux/mm.h>") ; do sed -i -e '/include <asm\/pgtable.h>/ d' $f done 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: Borislav Petkov <bp@alien8.de> Cc: Brian Cain <bcain@codeaurora.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Chris Zankel <chris@zankel.net> Cc: "David S. Miller" <davem@davemloft.net> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Greentime Hu <green.hu@gmail.com> Cc: Greg Ungerer <gerg@linux-m68k.org> Cc: Guan Xuetao <gxt@pku.edu.cn> Cc: Guo Ren <guoren@kernel.org> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Helge Deller <deller@gmx.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: Ley Foon Tan <ley.foon.tan@intel.com> Cc: Mark Salter <msalter@redhat.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Matt Turner <mattst88@gmail.com> Cc: Max Filippov <jcmvbkbc@gmail.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Michal Simek <monstr@monstr.eu> Cc: Mike Rapoport <rppt@kernel.org> Cc: Nick Hu <nickhu@andestech.com> Cc: Paul Walmsley <paul.walmsley@sifive.com> Cc: Richard Weinberger <richard@nod.at> Cc: Rich Felker <dalias@libc.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Stafford Horne <shorne@gmail.com> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Tony Luck <tony.luck@intel.com> Cc: Vincent Chen <deanbo422@gmail.com> Cc: Vineet Gupta <vgupta@synopsys.com> Cc: Will Deacon <will@kernel.org> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Link: http://lkml.kernel.org/r/20200514170327.31389-1-rppt@kernel.org Link: http://lkml.kernel.org/r/20200514170327.31389-2-rppt@kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
292 lines
7.2 KiB
C
292 lines
7.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/seq_file.h>
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#include <linux/debugfs.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/kasan.h>
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#include <asm/kasan.h>
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#include <asm/sections.h>
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static unsigned long max_addr;
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struct addr_marker {
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unsigned long start_address;
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const char *name;
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};
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enum address_markers_idx {
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IDENTITY_NR = 0,
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KERNEL_START_NR,
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KERNEL_END_NR,
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#ifdef CONFIG_KASAN
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KASAN_SHADOW_START_NR,
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KASAN_SHADOW_END_NR,
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#endif
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VMEMMAP_NR,
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VMALLOC_NR,
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MODULES_NR,
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};
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static struct addr_marker address_markers[] = {
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[IDENTITY_NR] = {0, "Identity Mapping"},
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[KERNEL_START_NR] = {(unsigned long)_stext, "Kernel Image Start"},
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[KERNEL_END_NR] = {(unsigned long)_end, "Kernel Image End"},
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#ifdef CONFIG_KASAN
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[KASAN_SHADOW_START_NR] = {KASAN_SHADOW_START, "Kasan Shadow Start"},
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[KASAN_SHADOW_END_NR] = {KASAN_SHADOW_END, "Kasan Shadow End"},
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#endif
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[VMEMMAP_NR] = {0, "vmemmap Area"},
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[VMALLOC_NR] = {0, "vmalloc Area"},
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[MODULES_NR] = {0, "Modules Area"},
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{ -1, NULL }
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};
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struct pg_state {
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int level;
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unsigned int current_prot;
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unsigned long start_address;
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unsigned long current_address;
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const struct addr_marker *marker;
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};
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static void print_prot(struct seq_file *m, unsigned int pr, int level)
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{
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static const char * const level_name[] =
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{ "ASCE", "PGD", "PUD", "PMD", "PTE" };
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seq_printf(m, "%s ", level_name[level]);
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if (pr & _PAGE_INVALID) {
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seq_printf(m, "I\n");
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return;
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}
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seq_puts(m, (pr & _PAGE_PROTECT) ? "RO " : "RW ");
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seq_puts(m, (pr & _PAGE_NOEXEC) ? "NX\n" : "X\n");
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}
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static void note_page(struct seq_file *m, struct pg_state *st,
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unsigned int new_prot, int level)
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{
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static const char units[] = "KMGTPE";
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int width = sizeof(unsigned long) * 2;
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const char *unit = units;
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unsigned int prot, cur;
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unsigned long delta;
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/*
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* If we have a "break" in the series, we need to flush the state
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* that we have now. "break" is either changing perms, levels or
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* address space marker.
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*/
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prot = new_prot;
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cur = st->current_prot;
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if (!st->level) {
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/* First entry */
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st->current_prot = new_prot;
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st->level = level;
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st->marker = address_markers;
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seq_printf(m, "---[ %s ]---\n", st->marker->name);
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} else if (prot != cur || level != st->level ||
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st->current_address >= st->marker[1].start_address) {
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/* Print the actual finished series */
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seq_printf(m, "0x%0*lx-0x%0*lx ",
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width, st->start_address,
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width, st->current_address);
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delta = (st->current_address - st->start_address) >> 10;
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while (!(delta & 0x3ff) && unit[1]) {
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delta >>= 10;
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unit++;
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}
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seq_printf(m, "%9lu%c ", delta, *unit);
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print_prot(m, st->current_prot, st->level);
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while (st->current_address >= st->marker[1].start_address) {
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st->marker++;
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seq_printf(m, "---[ %s ]---\n", st->marker->name);
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}
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st->start_address = st->current_address;
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st->current_prot = new_prot;
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st->level = level;
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}
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}
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#ifdef CONFIG_KASAN
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static void note_kasan_early_shadow_page(struct seq_file *m,
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struct pg_state *st)
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{
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unsigned int prot;
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prot = pte_val(*kasan_early_shadow_pte) &
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(_PAGE_PROTECT | _PAGE_INVALID | _PAGE_NOEXEC);
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note_page(m, st, prot, 4);
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}
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#endif
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/*
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* The actual page table walker functions. In order to keep the
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* implementation of print_prot() short, we only check and pass
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* _PAGE_INVALID and _PAGE_PROTECT flags to note_page() if a region,
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* segment or page table entry is invalid or read-only.
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* After all it's just a hint that the current level being walked
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* contains an invalid or read-only entry.
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*/
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static void walk_pte_level(struct seq_file *m, struct pg_state *st,
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pmd_t *pmd, unsigned long addr)
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{
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unsigned int prot;
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pte_t *pte;
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int i;
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for (i = 0; i < PTRS_PER_PTE && addr < max_addr; i++) {
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st->current_address = addr;
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pte = pte_offset_kernel(pmd, addr);
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prot = pte_val(*pte) &
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(_PAGE_PROTECT | _PAGE_INVALID | _PAGE_NOEXEC);
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note_page(m, st, prot, 4);
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addr += PAGE_SIZE;
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}
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}
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static void walk_pmd_level(struct seq_file *m, struct pg_state *st,
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pud_t *pud, unsigned long addr)
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{
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unsigned int prot;
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pmd_t *pmd;
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int i;
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#ifdef CONFIG_KASAN
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if ((pud_val(*pud) & PAGE_MASK) == __pa(kasan_early_shadow_pmd)) {
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note_kasan_early_shadow_page(m, st);
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return;
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}
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#endif
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pmd = pmd_offset(pud, addr);
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for (i = 0; i < PTRS_PER_PMD && addr < max_addr; i++, pmd++) {
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st->current_address = addr;
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if (!pmd_none(*pmd)) {
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if (pmd_large(*pmd)) {
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prot = pmd_val(*pmd) &
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(_SEGMENT_ENTRY_PROTECT |
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_SEGMENT_ENTRY_NOEXEC);
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note_page(m, st, prot, 3);
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} else
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walk_pte_level(m, st, pmd, addr);
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} else
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note_page(m, st, _PAGE_INVALID, 3);
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addr += PMD_SIZE;
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}
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}
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static void walk_pud_level(struct seq_file *m, struct pg_state *st,
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p4d_t *p4d, unsigned long addr)
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{
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unsigned int prot;
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pud_t *pud;
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int i;
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#ifdef CONFIG_KASAN
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if ((p4d_val(*p4d) & PAGE_MASK) == __pa(kasan_early_shadow_pud)) {
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note_kasan_early_shadow_page(m, st);
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return;
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}
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#endif
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pud = pud_offset(p4d, addr);
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for (i = 0; i < PTRS_PER_PUD && addr < max_addr; i++, pud++) {
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st->current_address = addr;
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if (!pud_none(*pud))
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if (pud_large(*pud)) {
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prot = pud_val(*pud) &
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(_REGION_ENTRY_PROTECT |
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_REGION_ENTRY_NOEXEC);
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note_page(m, st, prot, 2);
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} else
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walk_pmd_level(m, st, pud, addr);
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else
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note_page(m, st, _PAGE_INVALID, 2);
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addr += PUD_SIZE;
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}
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}
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static void walk_p4d_level(struct seq_file *m, struct pg_state *st,
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pgd_t *pgd, unsigned long addr)
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{
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p4d_t *p4d;
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int i;
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#ifdef CONFIG_KASAN
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if ((pgd_val(*pgd) & PAGE_MASK) == __pa(kasan_early_shadow_p4d)) {
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note_kasan_early_shadow_page(m, st);
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return;
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}
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#endif
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p4d = p4d_offset(pgd, addr);
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for (i = 0; i < PTRS_PER_P4D && addr < max_addr; i++, p4d++) {
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st->current_address = addr;
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if (!p4d_none(*p4d))
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walk_pud_level(m, st, p4d, addr);
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else
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note_page(m, st, _PAGE_INVALID, 2);
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addr += P4D_SIZE;
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}
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}
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static void walk_pgd_level(struct seq_file *m)
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{
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unsigned long addr = 0;
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struct pg_state st;
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pgd_t *pgd;
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int i;
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memset(&st, 0, sizeof(st));
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for (i = 0; i < PTRS_PER_PGD && addr < max_addr; i++) {
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st.current_address = addr;
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pgd = pgd_offset_k(addr);
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if (!pgd_none(*pgd))
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walk_p4d_level(m, &st, pgd, addr);
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else
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note_page(m, &st, _PAGE_INVALID, 1);
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addr += PGDIR_SIZE;
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cond_resched();
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}
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/* Flush out the last page */
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st.current_address = max_addr;
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note_page(m, &st, 0, 0);
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}
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static int ptdump_show(struct seq_file *m, void *v)
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{
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walk_pgd_level(m);
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return 0;
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}
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static int ptdump_open(struct inode *inode, struct file *filp)
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{
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return single_open(filp, ptdump_show, NULL);
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}
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static const struct file_operations ptdump_fops = {
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.open = ptdump_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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static int pt_dump_init(void)
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{
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/*
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* Figure out the maximum virtual address being accessible with the
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* kernel ASCE. We need this to keep the page table walker functions
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* from accessing non-existent entries.
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*/
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max_addr = (S390_lowcore.kernel_asce & _REGION_ENTRY_TYPE_MASK) >> 2;
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max_addr = 1UL << (max_addr * 11 + 31);
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address_markers[MODULES_NR].start_address = MODULES_VADDR;
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address_markers[VMEMMAP_NR].start_address = (unsigned long) vmemmap;
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address_markers[VMALLOC_NR].start_address = VMALLOC_START;
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debugfs_create_file("kernel_page_tables", 0400, NULL, NULL, &ptdump_fops);
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return 0;
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}
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device_initcall(pt_dump_init);
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