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powerpc/ptdump: Convert powerpc to GENERIC_PTDUMP

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This patch converts powerpc to the generic PTDUMP implementation.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/03166d569526be70214fe9370a7bad219d2f41c8.1625762907.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy
2021-07-08 16:49:43 +00:00
committed by Michael Ellerman
parent cf98d2b6ee
commit e084728393
6 changed files with 47 additions and 144 deletions
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146
arch/powerpc/mm/ptdump/ptdump.c
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@@ -16,6 +16,7 @@
#include <linux/io.h>
#include <linux/mm.h>
#include <linux/highmem.h>
#include <linux/ptdump.h>
#include <linux/sched.h>
#include <linux/seq_file.h>
#include <asm/fixmap.h>
@@ -54,6 +55,7 @@
*
*/
struct pg_state {
struct ptdump_state ptdump;
struct seq_file *seq;
const struct addr_marker *marker;
unsigned long start_address;
@@ -102,6 +104,11 @@ static struct addr_marker address_markers[] = {
{ -1, NULL },
};
static struct ptdump_range ptdump_range[] __ro_after_init = {
{TASK_SIZE_MAX, ~0UL},
{0, 0}
};
#define pt_dump_seq_printf(m, fmt, args...) \
({ \
if (m) \
@@ -204,10 +211,10 @@ static void note_page_update_state(struct pg_state *st, unsigned long addr, int
}
}
static void note_page(struct pg_state *st, unsigned long addr,
int level, u64 val, unsigned long page_size)
static void note_page(struct ptdump_state *pt_st, unsigned long addr, int level, u64 val)
{
u64 flag = level >= 0 ? val & pg_level[level].mask : 0;
struct pg_state *st = container_of(pt_st, struct pg_state, ptdump);
/* At first no level is set */
if (st->level == -1) {
@@ -245,94 +252,6 @@ static void note_page(struct pg_state *st, unsigned long addr,
}
}
static void walk_pte(struct pg_state *st, pmd_t *pmd, unsigned long start)
{
pte_t *pte = pte_offset_kernel(pmd, 0);
unsigned long addr;
unsigned int i;
for (i = 0; i < PTRS_PER_PTE; i++, pte++) {
addr = start + i * PAGE_SIZE;
note_page(st, addr, 4, pte_val(*pte), PAGE_SIZE);
}
}
static void walk_hugepd(struct pg_state *st, hugepd_t *phpd, unsigned long start,
int pdshift, int level)
{
#ifdef CONFIG_ARCH_HAS_HUGEPD
unsigned int i;
int shift = hugepd_shift(*phpd);
int ptrs_per_hpd = pdshift - shift > 0 ? 1 << (pdshift - shift) : 1;
if (start & ((1 << shift) - 1))
return;
for (i = 0; i < ptrs_per_hpd; i++) {
unsigned long addr = start + (i << shift);
pte_t *pte = hugepte_offset(*phpd, addr, pdshift);
note_page(st, addr, level + 1, pte_val(*pte), 1 << shift);
}
#endif
}
static void walk_pmd(struct pg_state *st, pud_t *pud, unsigned long start)
{
pmd_t *pmd = pmd_offset(pud, 0);
unsigned long addr;
unsigned int i;
for (i = 0; i < PTRS_PER_PMD; i++, pmd++) {
addr = start + i * PMD_SIZE;
if (!pmd_none(*pmd) && !pmd_is_leaf(*pmd))
/* pmd exists */
walk_pte(st, pmd, addr);
else
note_page(st, addr, 3, pmd_val(*pmd), PMD_SIZE);
}
}
static void walk_pud(struct pg_state *st, p4d_t *p4d, unsigned long start)
{
pud_t *pud = pud_offset(p4d, 0);
unsigned long addr;
unsigned int i;
for (i = 0; i < PTRS_PER_PUD; i++, pud++) {
addr = start + i * PUD_SIZE;
if (!pud_none(*pud) && !pud_is_leaf(*pud))
/* pud exists */
walk_pmd(st, pud, addr);
else
note_page(st, addr, 2, pud_val(*pud), PUD_SIZE);
}
}
static void walk_pagetables(struct pg_state *st)
{
unsigned int i;
unsigned long addr = st->start_address & PGDIR_MASK;
pgd_t *pgd = pgd_offset_k(addr);
/*
* Traverse the linux pagetable structure and dump pages that are in
* the hash pagetable.
*/
for (i = pgd_index(addr); i < PTRS_PER_PGD; i++, pgd++, addr += PGDIR_SIZE) {
p4d_t *p4d = p4d_offset(pgd, 0);
if (p4d_none(*p4d) || p4d_is_leaf(*p4d))
note_page(st, addr, 1, p4d_val(*p4d), PGDIR_SIZE);
else if (is_hugepd(__hugepd(p4d_val(*p4d))))
walk_hugepd(st, (hugepd_t *)p4d, addr, PGDIR_SHIFT, 1);
else
/* p4d exists */
walk_pud(st, p4d, addr);
}
}
static void populate_markers(void)
{
int i = 0;
@@ -383,17 +302,14 @@ static int ptdump_show(struct seq_file *m, void *v)
.seq = m,
.marker = address_markers,
.level = -1,
.start_address = IS_ENABLED(CONFIG_PPC64) ? PAGE_OFFSET : TASK_SIZE,
.ptdump = {
.note_page = note_page,
.range = ptdump_range,
}
};
#ifdef CONFIG_PPC64
if (!radix_enabled())
st.start_address = KERN_VIRT_START;
#endif
/* Traverse kernel page tables */
walk_pagetables(&st);
note_page(&st, 0, -1, 0, 0);
ptdump_walk_pgd(&st.ptdump, &init_mm, NULL);
return 0;
}
@@ -409,23 +325,24 @@ static void build_pgtable_complete_mask(void)
pg_level[i].mask |= pg_level[i].flag[j].mask;
}
#ifdef CONFIG_PPC_DEBUG_WX
#ifdef CONFIG_DEBUG_WX
void ptdump_check_wx(void)
{
struct pg_state st = {
.seq = NULL,
.marker = address_markers,
.marker = (struct addr_marker[]) {
{ 0, NULL},
{ -1, NULL},
},
.level = -1,
.check_wx = true,
.start_address = IS_ENABLED(CONFIG_PPC64) ? PAGE_OFFSET : TASK_SIZE,
.ptdump = {
.note_page = note_page,
.range = ptdump_range,
}
};
#ifdef CONFIG_PPC64
if (!radix_enabled())
st.start_address = KERN_VIRT_START;
#endif
walk_pagetables(&st);
ptdump_walk_pgd(&st.ptdump, &init_mm, NULL);
if (st.wx_pages)
pr_warn("Checked W+X mappings: FAILED, %lu W+X pages found\n",
@@ -435,12 +352,21 @@ void ptdump_check_wx(void)
}
#endif
static int ptdump_init(void)
static int __init ptdump_init(void)
{
#ifdef CONFIG_PPC64
if (!radix_enabled())
ptdump_range[0].start = KERN_VIRT_START;
else
ptdump_range[0].start = PAGE_OFFSET;
#endif
populate_markers();
build_pgtable_complete_mask();
debugfs_create_file("kernel_page_tables", 0400, NULL, NULL,
&ptdump_fops);
if (IS_ENABLED(CONFIG_PTDUMP_DEBUGFS))
debugfs_create_file("kernel_page_tables", 0400, NULL, NULL, &ptdump_fops);
return 0;
}
device_initcall(ptdump_init);