xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

powerpc: Move page table dump files in a dedicated subdirectory

Browse Source 
This patch moves the files related to page table dump in a
dedicated subdirectory.

The purpose is to clean a bit arch/powerpc/mm by regrouping
multiple files handling a dedicated function.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
[mpe: Shorten the file names while we're at it]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Christophe Leroy
2019-02-18 12:28:36 +00:00
committed by Michael Ellerman
parent cabe8138b2
commit e66c3209c7
11 changed files with 14 additions and 17 deletions
Download Patch File Download Diff File Expand all files Collapse all files

82
arch/powerpc/mm/ptdump/8xx.c Normal file
View File

@@ -0,0 +1,82 @@
// SPDX-License-Identifier: GPL-2.0
/*
* From split of dump_linuxpagetables.c
* Copyright 2016, Rashmica Gupta, IBM Corp.
*
*/
#include <linux/kernel.h>
#include <asm/pgtable.h>
#include "ptdump.h"
static const struct flag_info flag_array[] = {
{
.mask = _PAGE_SH,
.val = 0,
.set = "user",
.clear = " ",
}, {
.mask = _PAGE_RO | _PAGE_NA,
.val = 0,
.set = "rw",
}, {
.mask = _PAGE_RO | _PAGE_NA,
.val = _PAGE_RO,
.set = "r ",
}, {
.mask = _PAGE_RO | _PAGE_NA,
.val = _PAGE_NA,
.set = " ",
}, {
.mask = _PAGE_EXEC,
.val = _PAGE_EXEC,
.set = " X ",
.clear = " ",
}, {
.mask = _PAGE_PRESENT,
.val = _PAGE_PRESENT,
.set = "present",
.clear = " ",
}, {
.mask = _PAGE_GUARDED,
.val = _PAGE_GUARDED,
.set = "guarded",
.clear = " ",
}, {
.mask = _PAGE_DIRTY,
.val = _PAGE_DIRTY,
.set = "dirty",
.clear = " ",
}, {
.mask = _PAGE_ACCESSED,
.val = _PAGE_ACCESSED,
.set = "accessed",
.clear = " ",
}, {
.mask = _PAGE_NO_CACHE,
.val = _PAGE_NO_CACHE,
.set = "no cache",
.clear = " ",
}, {
.mask = _PAGE_SPECIAL,
.val = _PAGE_SPECIAL,
.set = "special",
}
};
struct pgtable_level pg_level[5] = {
{
}, { /* pgd */
.flag = flag_array,
.num = ARRAY_SIZE(flag_array),
}, { /* pud */
.flag = flag_array,
.num = ARRAY_SIZE(flag_array),
}, { /* pmd */
.flag = flag_array,
.num = ARRAY_SIZE(flag_array),
}, { /* pte */
.flag = flag_array,
.num = ARRAY_SIZE(flag_array),
},
};

9
arch/powerpc/mm/ptdump/Makefile Normal file
View File

@@ -0,0 +1,9 @@
# SPDX-License-Identifier: GPL-2.0
obj-y += ptdump.o
obj-$(CONFIG_4xx) += shared.o
obj-$(CONFIG_PPC_8xx) += 8xx.o
obj-$(CONFIG_PPC_BOOK3E_MMU) += shared.o
obj-$(CONFIG_PPC_BOOK3S_32) += shared.o bats.o segment_regs.o
obj-$(CONFIG_PPC_BOOK3S_64) += book3s64.o hashpagetable.o

173
arch/powerpc/mm/ptdump/bats.c Normal file
View File

@@ -0,0 +1,173 @@
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2018, Christophe Leroy CS S.I.
* <christophe.leroy@c-s.fr>
*
* This dumps the content of BATS
*/
#include <asm/debugfs.h>
#include <asm/pgtable.h>
#include <asm/cpu_has_feature.h>
static char *pp_601(int k, int pp)
{
if (pp == 0)
return k ? "NA" : "RWX";
if (pp == 1)
return k ? "ROX" : "RWX";
if (pp == 2)
return k ? "RWX" : "RWX";
return k ? "ROX" : "ROX";
}
static void bat_show_601(struct seq_file *m, int idx, u32 lower, u32 upper)
{
u32 blpi = upper & 0xfffe0000;
u32 k = (upper >> 2) & 3;
u32 pp = upper & 3;
phys_addr_t pbn = PHYS_BAT_ADDR(lower);
u32 bsm = lower & 0x3ff;
u32 size = (bsm + 1) << 17;
seq_printf(m, "%d: ", idx);
if (!(lower & 0x40)) {
seq_puts(m, " -\n");
return;
}
seq_printf(m, "0x%08x-0x%08x ", blpi, blpi + size - 1);
#ifdef CONFIG_PHYS_64BIT
seq_printf(m, "0x%016llx ", pbn);
#else
seq_printf(m, "0x%08x ", pbn);
#endif
seq_printf(m, "Kernel %s User %s", pp_601(k & 2, pp), pp_601(k & 1, pp));
if (lower & _PAGE_WRITETHRU)
seq_puts(m, "write through ");
if (lower & _PAGE_NO_CACHE)
seq_puts(m, "no cache ");
if (lower & _PAGE_COHERENT)
seq_puts(m, "coherent ");
seq_puts(m, "\n");
}
#define BAT_SHOW_601(_m, _n, _l, _u) bat_show_601(_m, _n, mfspr(_l), mfspr(_u))
static int bats_show_601(struct seq_file *m, void *v)
{
seq_puts(m, "---[ Block Address Translation ]---\n");
BAT_SHOW_601(m, 0, SPRN_IBAT0L, SPRN_IBAT0U);
BAT_SHOW_601(m, 1, SPRN_IBAT1L, SPRN_IBAT1U);
BAT_SHOW_601(m, 2, SPRN_IBAT2L, SPRN_IBAT2U);
BAT_SHOW_601(m, 3, SPRN_IBAT3L, SPRN_IBAT3U);
return 0;
}
static void bat_show_603(struct seq_file *m, int idx, u32 lower, u32 upper, bool is_d)
{
u32 bepi = upper & 0xfffe0000;
u32 bl = (upper >> 2) & 0x7ff;
u32 k = upper & 3;
phys_addr_t brpn = PHYS_BAT_ADDR(lower);
u32 size = (bl + 1) << 17;
seq_printf(m, "%d: ", idx);
if (k == 0) {
seq_puts(m, " -\n");
return;
}
seq_printf(m, "0x%08x-0x%08x ", bepi, bepi + size - 1);
#ifdef CONFIG_PHYS_64BIT
seq_printf(m, "0x%016llx ", brpn);
#else
seq_printf(m, "0x%08x ", brpn);
#endif
if (k == 1)
seq_puts(m, "User ");
else if (k == 2)
seq_puts(m, "Kernel ");
else
seq_puts(m, "Kernel/User ");
if (lower & BPP_RX)
seq_puts(m, is_d ? "RO " : "EXEC ");
else if (lower & BPP_RW)
seq_puts(m, is_d ? "RW " : "EXEC ");
else
seq_puts(m, is_d ? "NA " : "NX ");
if (lower & _PAGE_WRITETHRU)
seq_puts(m, "write through ");
if (lower & _PAGE_NO_CACHE)
seq_puts(m, "no cache ");
if (lower & _PAGE_COHERENT)
seq_puts(m, "coherent ");
if (lower & _PAGE_GUARDED)
seq_puts(m, "guarded ");
seq_puts(m, "\n");
}
#define BAT_SHOW_603(_m, _n, _l, _u, _d) bat_show_603(_m, _n, mfspr(_l), mfspr(_u), _d)
static int bats_show_603(struct seq_file *m, void *v)
{
seq_puts(m, "---[ Instruction Block Address Translation ]---\n");
BAT_SHOW_603(m, 0, SPRN_IBAT0L, SPRN_IBAT0U, false);
BAT_SHOW_603(m, 1, SPRN_IBAT1L, SPRN_IBAT1U, false);
BAT_SHOW_603(m, 2, SPRN_IBAT2L, SPRN_IBAT2U, false);
BAT_SHOW_603(m, 3, SPRN_IBAT3L, SPRN_IBAT3U, false);
if (mmu_has_feature(MMU_FTR_USE_HIGH_BATS)) {
BAT_SHOW_603(m, 4, SPRN_IBAT4L, SPRN_IBAT4U, false);
BAT_SHOW_603(m, 5, SPRN_IBAT5L, SPRN_IBAT5U, false);
BAT_SHOW_603(m, 6, SPRN_IBAT6L, SPRN_IBAT6U, false);
BAT_SHOW_603(m, 7, SPRN_IBAT7L, SPRN_IBAT7U, false);
}
seq_puts(m, "\n---[ Data Block Address Translation ]---\n");
BAT_SHOW_603(m, 0, SPRN_DBAT0L, SPRN_DBAT0U, true);
BAT_SHOW_603(m, 1, SPRN_DBAT1L, SPRN_DBAT1U, true);
BAT_SHOW_603(m, 2, SPRN_DBAT2L, SPRN_DBAT2U, true);
BAT_SHOW_603(m, 3, SPRN_DBAT3L, SPRN_DBAT3U, true);
if (mmu_has_feature(MMU_FTR_USE_HIGH_BATS)) {
BAT_SHOW_603(m, 4, SPRN_DBAT4L, SPRN_DBAT4U, true);
BAT_SHOW_603(m, 5, SPRN_DBAT5L, SPRN_DBAT5U, true);
BAT_SHOW_603(m, 6, SPRN_DBAT6L, SPRN_DBAT6U, true);
BAT_SHOW_603(m, 7, SPRN_DBAT7L, SPRN_DBAT7U, true);
}
return 0;
}
static int bats_open(struct inode *inode, struct file *file)
{
if (cpu_has_feature(CPU_FTR_601))
return single_open(file, bats_show_601, NULL);
return single_open(file, bats_show_603, NULL);
}
static const struct file_operations bats_fops = {
.open = bats_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int __init bats_init(void)
{
struct dentry *debugfs_file;
debugfs_file = debugfs_create_file("block_address_translation", 0400,
powerpc_debugfs_root, NULL, &bats_fops);
return debugfs_file ? 0 : -ENOMEM;
}
device_initcall(bats_init);

120
arch/powerpc/mm/ptdump/book3s64.c Normal file
View File

@@ -0,0 +1,120 @@
// SPDX-License-Identifier: GPL-2.0
/*
* From split of dump_linuxpagetables.c
* Copyright 2016, Rashmica Gupta, IBM Corp.
*
*/
#include <linux/kernel.h>
#include <asm/pgtable.h>
#include "ptdump.h"
static const struct flag_info flag_array[] = {
{
.mask = _PAGE_PRIVILEGED,
.val = 0,
.set = "user",
.clear = " ",
}, {
.mask = _PAGE_READ,
.val = _PAGE_READ,
.set = "r",
.clear = " ",
}, {
.mask = _PAGE_WRITE,
.val = _PAGE_WRITE,
.set = "w",
.clear = " ",
}, {
.mask = _PAGE_EXEC,
.val = _PAGE_EXEC,
.set = " X ",
.clear = " ",
}, {
.mask = _PAGE_PTE,
.val = _PAGE_PTE,
.set = "pte",
.clear = " ",
}, {
.mask = _PAGE_PRESENT,
.val = _PAGE_PRESENT,
.set = "valid",
.clear = " ",
}, {
.mask = _PAGE_PRESENT | _PAGE_INVALID,
.val = 0,
.set = " ",
.clear = "present",
}, {
.mask = H_PAGE_HASHPTE,
.val = H_PAGE_HASHPTE,
.set = "hpte",
.clear = " ",
}, {
.mask = _PAGE_DIRTY,
.val = _PAGE_DIRTY,
.set = "dirty",
.clear = " ",
}, {
.mask = _PAGE_ACCESSED,
.val = _PAGE_ACCESSED,
.set = "accessed",
.clear = " ",
}, {
.mask = _PAGE_NON_IDEMPOTENT,
.val = _PAGE_NON_IDEMPOTENT,
.set = "non-idempotent",
.clear = " ",
}, {
.mask = _PAGE_TOLERANT,
.val = _PAGE_TOLERANT,
.set = "tolerant",
.clear = " ",
}, {
.mask = H_PAGE_BUSY,
.val = H_PAGE_BUSY,
.set = "busy",
}, {
#ifdef CONFIG_PPC_64K_PAGES
.mask = H_PAGE_COMBO,
.val = H_PAGE_COMBO,
.set = "combo",
}, {
.mask = H_PAGE_4K_PFN,
.val = H_PAGE_4K_PFN,
.set = "4K_pfn",
}, {
#else /* CONFIG_PPC_64K_PAGES */
.mask = H_PAGE_F_GIX,
.val = H_PAGE_F_GIX,
.set = "f_gix",
.is_val = true,
.shift = H_PAGE_F_GIX_SHIFT,
}, {
.mask = H_PAGE_F_SECOND,
.val = H_PAGE_F_SECOND,
.set = "f_second",
}, {
#endif /* CONFIG_PPC_64K_PAGES */
.mask = _PAGE_SPECIAL,
.val = _PAGE_SPECIAL,
.set = "special",
}
};
struct pgtable_level pg_level[5] = {
{
}, { /* pgd */
.flag = flag_array,
.num = ARRAY_SIZE(flag_array),
}, { /* pud */
.flag = flag_array,
.num = ARRAY_SIZE(flag_array),
}, { /* pmd */
.flag = flag_array,
.num = ARRAY_SIZE(flag_array),
}, { /* pte */
.flag = flag_array,
.num = ARRAY_SIZE(flag_array),
},
};

550
arch/powerpc/mm/ptdump/hashpagetable.c Normal file
View File

@@ -0,0 +1,550 @@
/*
* Copyright 2016, Rashmica Gupta, IBM Corp.
*
* This traverses the kernel virtual memory and dumps the pages that are in
* the hash pagetable, along with their flags to
* /sys/kernel/debug/kernel_hash_pagetable.
*
* If radix is enabled then there is no hash page table and so no debugfs file
* is generated.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; version 2
* of the License.
*/
#include <linux/debugfs.h>
#include <linux/fs.h>
#include <linux/io.h>
#include <linux/mm.h>
#include <linux/sched.h>
#include <linux/seq_file.h>
#include <asm/pgtable.h>
#include <linux/const.h>
#include <asm/page.h>
#include <asm/pgalloc.h>
#include <asm/plpar_wrappers.h>
#include <linux/memblock.h>
#include <asm/firmware.h>
struct pg_state {
struct seq_file *seq;
const struct addr_marker *marker;
unsigned long start_address;
unsigned int level;
u64 current_flags;
};
struct addr_marker {
unsigned long start_address;
const char *name;
};
static struct addr_marker address_markers[] = {
{ 0, "Start of kernel VM" },
{ 0, "vmalloc() Area" },
{ 0, "vmalloc() End" },
{ 0, "isa I/O start" },
{ 0, "isa I/O end" },
{ 0, "phb I/O start" },
{ 0, "phb I/O end" },
{ 0, "I/O remap start" },
{ 0, "I/O remap end" },
{ 0, "vmemmap start" },
{ -1, NULL },
};
struct flag_info {
u64 mask;
u64 val;
const char *set;
const char *clear;
bool is_val;
int shift;
};
static const struct flag_info v_flag_array[] = {
{
.mask = SLB_VSID_B,
.val = SLB_VSID_B_256M,
.set = "ssize: 256M",
.clear = "ssize: 1T ",
}, {
.mask = HPTE_V_SECONDARY,
.val = HPTE_V_SECONDARY,
.set = "secondary",
.clear = "primary ",
}, {
.mask = HPTE_V_VALID,
.val = HPTE_V_VALID,
.set = "valid ",
.clear = "invalid",
}, {
.mask = HPTE_V_BOLTED,
.val = HPTE_V_BOLTED,
.set = "bolted",
.clear = "",
}
};
static const struct flag_info r_flag_array[] = {
{
.mask = HPTE_R_PP0 | HPTE_R_PP,
.val = PP_RWXX,
.set = "prot:RW--",
}, {
.mask = HPTE_R_PP0 | HPTE_R_PP,
.val = PP_RWRX,
.set = "prot:RWR-",
}, {
.mask = HPTE_R_PP0 | HPTE_R_PP,
.val = PP_RWRW,
.set = "prot:RWRW",
}, {
.mask = HPTE_R_PP0 | HPTE_R_PP,
.val = PP_RXRX,
.set = "prot:R-R-",
}, {
.mask = HPTE_R_PP0 | HPTE_R_PP,
.val = PP_RXXX,
.set = "prot:R---",
}, {
.mask = HPTE_R_KEY_HI | HPTE_R_KEY_LO,
.val = HPTE_R_KEY_HI | HPTE_R_KEY_LO,
.set = "key",
.clear = "",
.is_val = true,
}, {
.mask = HPTE_R_R,
.val = HPTE_R_R,
.set = "ref",
.clear = " ",
}, {
.mask = HPTE_R_C,
.val = HPTE_R_C,
.set = "changed",
.clear = " ",
}, {
.mask = HPTE_R_N,
.val = HPTE_R_N,
.set = "no execute",
}, {
.mask = HPTE_R_WIMG,
.val = HPTE_R_W,
.set = "writethru",
}, {
.mask = HPTE_R_WIMG,
.val = HPTE_R_I,
.set = "no cache",
}, {
.mask = HPTE_R_WIMG,
.val = HPTE_R_G,
.set = "guarded",
}
};
static int calculate_pagesize(struct pg_state *st, int ps, char s[])
{
static const char units[] = "BKMGTPE";
const char *unit = units;
while (ps > 9 && unit[1]) {
ps -= 10;
unit++;
}
seq_printf(st->seq, " %s_ps: %i%c\t", s, 1<<ps, *unit);
return ps;
}
static void dump_flag_info(struct pg_state *st, const struct flag_info
*flag, u64 pte, int num)
{
unsigned int i;
for (i = 0; i < num; i++, flag++) {
const char *s = NULL;
u64 val;
/* flag not defined so don't check it */
if (flag->mask == 0)
continue;
/* Some 'flags' are actually values */
if (flag->is_val) {
val = pte & flag->val;
if (flag->shift)
val = val >> flag->shift;
seq_printf(st->seq, " %s:%llx", flag->set, val);
} else {
if ((pte & flag->mask) == flag->val)
s = flag->set;
else
s = flag->clear;
if (s)
seq_printf(st->seq, " %s", s);
}
}
}
static void dump_hpte_info(struct pg_state *st, unsigned long ea, u64 v, u64 r,
unsigned long rpn, int bps, int aps, unsigned long lp)
{
int aps_index;
while (ea >= st->marker[1].start_address) {
st->marker++;
seq_printf(st->seq, "---[ %s ]---\n", st->marker->name);
}
seq_printf(st->seq, "0x%lx:\t", ea);
seq_printf(st->seq, "AVPN:%llx\t", HPTE_V_AVPN_VAL(v));
dump_flag_info(st, v_flag_array, v, ARRAY_SIZE(v_flag_array));
seq_printf(st->seq, " rpn: %lx\t", rpn);
dump_flag_info(st, r_flag_array, r, ARRAY_SIZE(r_flag_array));
calculate_pagesize(st, bps, "base");
aps_index = calculate_pagesize(st, aps, "actual");
if (aps_index != 2)
seq_printf(st->seq, "LP enc: %lx", lp);
seq_putc(st->seq, '\n');
}
static int native_find(unsigned long ea, int psize, bool primary, u64 *v, u64
*r)
{
struct hash_pte *hptep;
unsigned long hash, vsid, vpn, hpte_group, want_v, hpte_v;
int i, ssize = mmu_kernel_ssize;
unsigned long shift = mmu_psize_defs[psize].shift;
/* calculate hash */
vsid = get_kernel_vsid(ea, ssize);
vpn = hpt_vpn(ea, vsid, ssize);
hash = hpt_hash(vpn, shift, ssize);
want_v = hpte_encode_avpn(vpn, psize, ssize);
/* to check in the secondary hash table, we invert the hash */
if (!primary)
hash = ~hash;
hpte_group = (hash & htab_hash_mask) * HPTES_PER_GROUP;
for (i = 0; i < HPTES_PER_GROUP; i++) {
hptep = htab_address + hpte_group;
hpte_v = be64_to_cpu(hptep->v);
if (HPTE_V_COMPARE(hpte_v, want_v) && (hpte_v & HPTE_V_VALID)) {
/* HPTE matches */
*v = be64_to_cpu(hptep->v);
*r = be64_to_cpu(hptep->r);
return 0;
}
++hpte_group;
}
return -1;
}
#ifdef CONFIG_PPC_PSERIES
static int pseries_find(unsigned long ea, int psize, bool primary, u64 *v, u64 *r)
{
struct hash_pte ptes[4];
unsigned long vsid, vpn, hash, hpte_group, want_v;
int i, j, ssize = mmu_kernel_ssize;
long lpar_rc = 0;
unsigned long shift = mmu_psize_defs[psize].shift;
/* calculate hash */
vsid = get_kernel_vsid(ea, ssize);
vpn = hpt_vpn(ea, vsid, ssize);
hash = hpt_hash(vpn, shift, ssize);
want_v = hpte_encode_avpn(vpn, psize, ssize);
/* to check in the secondary hash table, we invert the hash */
if (!primary)
hash = ~hash;
hpte_group = (hash & htab_hash_mask) * HPTES_PER_GROUP;
/* see if we can find an entry in the hpte with this hash */
for (i = 0; i < HPTES_PER_GROUP; i += 4, hpte_group += 4) {
lpar_rc = plpar_pte_read_4(0, hpte_group, (void *)ptes);
if (lpar_rc != H_SUCCESS)
continue;
for (j = 0; j < 4; j++) {
if (HPTE_V_COMPARE(ptes[j].v, want_v) &&
(ptes[j].v & HPTE_V_VALID)) {
/* HPTE matches */
*v = ptes[j].v;
*r = ptes[j].r;
return 0;
}
}
}
return -1;
}
#endif
static void decode_r(int bps, unsigned long r, unsigned long *rpn, int *aps,
unsigned long *lp_bits)
{
struct mmu_psize_def entry;
unsigned long arpn, mask, lp;
int penc = -2, idx = 0, shift;
/*.
* The LP field has 8 bits. Depending on the actual page size, some of
* these bits are concatenated with the APRN to get the RPN. The rest
* of the bits in the LP field is the LP value and is an encoding for
* the base page size and the actual page size.
*
* - find the mmu entry for our base page size
* - go through all page encodings and use the associated mask to
* find an encoding that matches our encoding in the LP field.
*/
arpn = (r & HPTE_R_RPN) >> HPTE_R_RPN_SHIFT;
lp = arpn & 0xff;
entry = mmu_psize_defs[bps];
while (idx < MMU_PAGE_COUNT) {
penc = entry.penc[idx];
if ((penc != -1) && (mmu_psize_defs[idx].shift)) {
shift = mmu_psize_defs[idx].shift - HPTE_R_RPN_SHIFT;
mask = (0x1 << (shift)) - 1;
if ((lp & mask) == penc) {
*aps = mmu_psize_to_shift(idx);
*lp_bits = lp & mask;
*rpn = arpn >> shift;
return;
}
}
idx++;
}
}
static int base_hpte_find(unsigned long ea, int psize, bool primary, u64 *v,
u64 *r)
{
#ifdef CONFIG_PPC_PSERIES
if (firmware_has_feature(FW_FEATURE_LPAR))
return pseries_find(ea, psize, primary, v, r);
#endif
return native_find(ea, psize, primary, v, r);
}
static unsigned long hpte_find(struct pg_state *st, unsigned long ea, int psize)
{
unsigned long slot;
u64 v = 0, r = 0;
unsigned long rpn, lp_bits;
int base_psize = 0, actual_psize = 0;
if (ea < PAGE_OFFSET)
return -1;
/* Look in primary table */
slot = base_hpte_find(ea, psize, true, &v, &r);
/* Look in secondary table */
if (slot == -1)
slot = base_hpte_find(ea, psize, true, &v, &r);
/* No entry found */
if (slot == -1)
return -1;
/*
* We found an entry in the hash page table:
* - check that this has the same base page
* - find the actual page size
* - find the RPN
*/
base_psize = mmu_psize_to_shift(psize);
if ((v & HPTE_V_LARGE) == HPTE_V_LARGE) {
decode_r(psize, r, &rpn, &actual_psize, &lp_bits);
} else {
/* 4K actual page size */
actual_psize = 12;
rpn = (r & HPTE_R_RPN) >> HPTE_R_RPN_SHIFT;
/* In this case there are no LP bits */
lp_bits = -1;
}
/*
* We didn't find a matching encoding, so the PTE we found isn't for
* this address.
*/
if (actual_psize == -1)
return -1;
dump_hpte_info(st, ea, v, r, rpn, base_psize, actual_psize, lp_bits);
return 0;
}
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, pteval, psize;
int i, status;
for (i = 0; i < PTRS_PER_PTE; i++, pte++) {
addr = start + i * PAGE_SIZE;
pteval = pte_val(*pte);
if (addr < VMALLOC_END)
psize = mmu_vmalloc_psize;
else
psize = mmu_io_psize;
#ifdef CONFIG_PPC_64K_PAGES
/* check for secret 4K mappings */
if (((pteval & H_PAGE_COMBO) == H_PAGE_COMBO) ||
((pteval & H_PAGE_4K_PFN) == H_PAGE_4K_PFN))
psize = mmu_io_psize;
#endif
/* check for hashpte */
status = hpte_find(st, addr, psize);
if (((pteval & H_PAGE_HASHPTE) != H_PAGE_HASHPTE)
&& (status != -1)) {
/* found a hpte that is not in the linux page tables */
seq_printf(st->seq, "page probably bolted before linux"
" pagetables were set: addr:%lx, pteval:%lx\n",
addr, pteval);
}
}
}
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 exists */
walk_pte(st, pmd, addr);
}
}
static void walk_pud(struct pg_state *st, pgd_t *pgd, unsigned long start)
{
pud_t *pud = pud_offset(pgd, 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 exists */
walk_pmd(st, pud, addr);
}
}
static void walk_pagetables(struct pg_state *st)
{
pgd_t *pgd = pgd_offset_k(0UL);
unsigned int i;
unsigned long addr;
/*
* Traverse the linux pagetable structure and dump pages that are in
* the hash pagetable.
*/
for (i = 0; i < PTRS_PER_PGD; i++, pgd++) {
addr = KERN_VIRT_START + i * PGDIR_SIZE;
if (!pgd_none(*pgd))
/* pgd exists */
walk_pud(st, pgd, addr);
}
}
static void walk_linearmapping(struct pg_state *st)
{
unsigned long addr;
/*
* Traverse the linear mapping section of virtual memory and dump pages
* that are in the hash pagetable.
*/
unsigned long psize = 1 << mmu_psize_defs[mmu_linear_psize].shift;
for (addr = PAGE_OFFSET; addr < PAGE_OFFSET +
memblock_end_of_DRAM(); addr += psize)
hpte_find(st, addr, mmu_linear_psize);
}
static void walk_vmemmap(struct pg_state *st)
{
#ifdef CONFIG_SPARSEMEM_VMEMMAP
struct vmemmap_backing *ptr = vmemmap_list;
/*
* Traverse the vmemmaped memory and dump pages that are in the hash
* pagetable.
*/
while (ptr->list) {
hpte_find(st, ptr->virt_addr, mmu_vmemmap_psize);
ptr = ptr->list;
}
seq_puts(st->seq, "---[ vmemmap end ]---\n");
#endif
}
static void populate_markers(void)
{
address_markers[0].start_address = PAGE_OFFSET;
address_markers[1].start_address = VMALLOC_START;
address_markers[2].start_address = VMALLOC_END;
address_markers[3].start_address = ISA_IO_BASE;
address_markers[4].start_address = ISA_IO_END;
address_markers[5].start_address = PHB_IO_BASE;
address_markers[6].start_address = PHB_IO_END;
address_markers[7].start_address = IOREMAP_BASE;
address_markers[8].start_address = IOREMAP_END;
#ifdef CONFIG_PPC_BOOK3S_64
address_markers[9].start_address = H_VMEMMAP_BASE;
#else
address_markers[9].start_address = VMEMMAP_BASE;
#endif
}
static int ptdump_show(struct seq_file *m, void *v)
{
struct pg_state st = {
.seq = m,
.start_address = PAGE_OFFSET,
.marker = address_markers,
};
/*
* Traverse the 0xc, 0xd and 0xf areas of the kernel virtual memory and
* dump pages that are in the hash pagetable.
*/
walk_linearmapping(&st);
walk_pagetables(&st);
walk_vmemmap(&st);
return 0;
}
static int ptdump_open(struct inode *inode, struct file *file)
{
return single_open(file, ptdump_show, NULL);
}
static const struct file_operations ptdump_fops = {
.open = ptdump_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int ptdump_init(void)
{
struct dentry *debugfs_file;
if (!radix_enabled()) {
populate_markers();
debugfs_file = debugfs_create_file("kernel_hash_pagetable",
0400, NULL, NULL, &ptdump_fops);
return debugfs_file ? 0 : -ENOMEM;
}
return 0;
}
device_initcall(ptdump_init);

379
arch/powerpc/mm/ptdump/ptdump.c Normal file
View File

@@ -0,0 +1,379 @@
/*
* Copyright 2016, Rashmica Gupta, IBM Corp.
*
* This traverses the kernel pagetables and dumps the
* information about the used sections of memory to
* /sys/kernel/debug/kernel_pagetables.
*
* Derived from the arm64 implementation:
* Copyright (c) 2014, The Linux Foundation, Laura Abbott.
* (C) Copyright 2008 Intel Corporation, Arjan van de Ven.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; version 2
* of the License.
*/
#include <linux/debugfs.h>
#include <linux/fs.h>
#include <linux/hugetlb.h>
#include <linux/io.h>
#include <linux/mm.h>
#include <linux/highmem.h>
#include <linux/sched.h>
#include <linux/seq_file.h>
#include <asm/fixmap.h>
#include <asm/pgtable.h>
#include <linux/const.h>
#include <asm/page.h>
#include <asm/pgalloc.h>
#include "ptdump.h"
#ifdef CONFIG_PPC32
#define KERN_VIRT_START 0
#endif
/*
* To visualise what is happening,
*
* - PTRS_PER_P** = how many entries there are in the corresponding P**
* - P**_SHIFT = how many bits of the address we use to index into the
* corresponding P**
* - P**_SIZE is how much memory we can access through the table - not the
* size of the table itself.
* P**={PGD, PUD, PMD, PTE}
*
*
* Each entry of the PGD points to a PUD. Each entry of a PUD points to a
* PMD. Each entry of a PMD points to a PTE. And every PTE entry points to
* a page.
*
* In the case where there are only 3 levels, the PUD is folded into the
* PGD: every PUD has only one entry which points to the PMD.
*
* The page dumper groups page table entries of the same type into a single
* description. It uses pg_state to track the range information while
* iterating over the PTE entries. When the continuity is broken it then
* dumps out a description of the range - ie PTEs that are virtually contiguous
* with the same PTE flags are chunked together. This is to make it clear how
* different areas of the kernel virtual memory are used.
*
*/
struct pg_state {
struct seq_file *seq;
const struct addr_marker *marker;
unsigned long start_address;
unsigned long start_pa;
unsigned long last_pa;
unsigned int level;
u64 current_flags;
};
struct addr_marker {
unsigned long start_address;
const char *name;
};
static struct addr_marker address_markers[] = {
{ 0, "Start of kernel VM" },
{ 0, "vmalloc() Area" },
{ 0, "vmalloc() End" },
#ifdef CONFIG_PPC64
{ 0, "isa I/O start" },
{ 0, "isa I/O end" },
{ 0, "phb I/O start" },
{ 0, "phb I/O end" },
{ 0, "I/O remap start" },
{ 0, "I/O remap end" },
{ 0, "vmemmap start" },
#else
{ 0, "Early I/O remap start" },
{ 0, "Early I/O remap end" },
#ifdef CONFIG_NOT_COHERENT_CACHE
{ 0, "Consistent mem start" },
{ 0, "Consistent mem end" },
#endif
#ifdef CONFIG_HIGHMEM
{ 0, "Highmem PTEs start" },
{ 0, "Highmem PTEs end" },
#endif
{ 0, "Fixmap start" },
{ 0, "Fixmap end" },
#endif
{ -1, NULL },
};
static void dump_flag_info(struct pg_state *st, const struct flag_info
*flag, u64 pte, int num)
{
unsigned int i;
for (i = 0; i < num; i++, flag++) {
const char *s = NULL;
u64 val;
/* flag not defined so don't check it */
if (flag->mask == 0)
continue;
/* Some 'flags' are actually values */
if (flag->is_val) {
val = pte & flag->val;
if (flag->shift)
val = val >> flag->shift;
seq_printf(st->seq, " %s:%llx", flag->set, val);
} else {
if ((pte & flag->mask) == flag->val)
s = flag->set;
else
s = flag->clear;
if (s)
seq_printf(st->seq, " %s", s);
}
st->current_flags &= ~flag->mask;
}
if (st->current_flags != 0)
seq_printf(st->seq, " unknown flags:%llx", st->current_flags);
}
static void dump_addr(struct pg_state *st, unsigned long addr)
{
static const char units[] = "KMGTPE";
const char *unit = units;
unsigned long delta;
#ifdef CONFIG_PPC64
#define REG "0x%016lx"
#else
#define REG "0x%08lx"
#endif
seq_printf(st->seq, REG "-" REG " ", st->start_address, addr - 1);
if (st->start_pa == st->last_pa && st->start_address + PAGE_SIZE != addr) {
seq_printf(st->seq, "[" REG "]", st->start_pa);
delta = PAGE_SIZE >> 10;
} else {
seq_printf(st->seq, " " REG " ", st->start_pa);
delta = (addr - st->start_address) >> 10;
}
/* Work out what appropriate unit to use */
while (!(delta & 1023) && unit[1]) {
delta >>= 10;
unit++;
}
seq_printf(st->seq, "%9lu%c", delta, *unit);
}
static void note_page(struct pg_state *st, unsigned long addr,
unsigned int level, u64 val)
{
u64 flag = val & pg_level[level].mask;
u64 pa = val & PTE_RPN_MASK;
/* At first no level is set */
if (!st->level) {
st->level = level;
st->current_flags = flag;
st->start_address = addr;
st->start_pa = pa;
st->last_pa = pa;
seq_printf(st->seq, "---[ %s ]---\n", st->marker->name);
/*
* Dump the section of virtual memory when:
* - the PTE flags from one entry to the next differs.
* - we change levels in the tree.
* - the address is in a different section of memory and is thus
* used for a different purpose, regardless of the flags.
* - the pa of this page is not adjacent to the last inspected page
*/
} else if (flag != st->current_flags || level != st->level ||
addr >= st->marker[1].start_address ||
(pa != st->last_pa + PAGE_SIZE &&
(pa != st->start_pa || st->start_pa != st->last_pa))) {
/* Check the PTE flags */
if (st->current_flags) {
dump_addr(st, addr);
/* Dump all the flags */
if (pg_level[st->level].flag)
dump_flag_info(st, pg_level[st->level].flag,
st->current_flags,
pg_level[st->level].num);
seq_putc(st->seq, '\n');
}
/*
* Address indicates we have passed the end of the
* current section of virtual memory
*/
while (addr >= st->marker[1].start_address) {
st->marker++;
seq_printf(st->seq, "---[ %s ]---\n", st->marker->name);
}
st->start_address = addr;
st->start_pa = pa;
st->last_pa = pa;
st->current_flags = flag;
st->level = level;
} else {
st->last_pa = pa;
}
}
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));
}
}
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_huge(*pmd))
/* pmd exists */
walk_pte(st, pmd, addr);
else
note_page(st, addr, 3, pmd_val(*pmd));
}
}
static void walk_pud(struct pg_state *st, pgd_t *pgd, unsigned long start)
{
pud_t *pud = pud_offset(pgd, 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_huge(*pud))
/* pud exists */
walk_pmd(st, pud, addr);
else
note_page(st, addr, 2, pud_val(*pud));
}
}
static void walk_pagetables(struct pg_state *st)
{
pgd_t *pgd = pgd_offset_k(0UL);
unsigned int i;
unsigned long addr;
addr = st->start_address;
/*
* Traverse the linux pagetable structure and dump pages that are in
* the hash pagetable.
*/
for (i = 0; i < PTRS_PER_PGD; i++, pgd++, addr += PGDIR_SIZE) {
if (!pgd_none(*pgd) && !pgd_huge(*pgd))
/* pgd exists */
walk_pud(st, pgd, addr);
else
note_page(st, addr, 1, pgd_val(*pgd));
}
}
static void populate_markers(void)
{
int i = 0;
address_markers[i++].start_address = PAGE_OFFSET;
address_markers[i++].start_address = VMALLOC_START;
address_markers[i++].start_address = VMALLOC_END;
#ifdef CONFIG_PPC64
address_markers[i++].start_address = ISA_IO_BASE;
address_markers[i++].start_address = ISA_IO_END;
address_markers[i++].start_address = PHB_IO_BASE;
address_markers[i++].start_address = PHB_IO_END;
address_markers[i++].start_address = IOREMAP_BASE;
address_markers[i++].start_address = IOREMAP_END;
#ifdef CONFIG_PPC_BOOK3S_64
address_markers[i++].start_address = H_VMEMMAP_BASE;
#else
address_markers[i++].start_address = VMEMMAP_BASE;
#endif
#else /* !CONFIG_PPC64 */
address_markers[i++].start_address = ioremap_bot;
address_markers[i++].start_address = IOREMAP_TOP;
#ifdef CONFIG_NOT_COHERENT_CACHE
address_markers[i++].start_address = IOREMAP_TOP;
address_markers[i++].start_address = IOREMAP_TOP +
CONFIG_CONSISTENT_SIZE;
#endif
#ifdef CONFIG_HIGHMEM
address_markers[i++].start_address = PKMAP_BASE;
address_markers[i++].start_address = PKMAP_ADDR(LAST_PKMAP);
#endif
address_markers[i++].start_address = FIXADDR_START;
address_markers[i++].start_address = FIXADDR_TOP;
#endif /* CONFIG_PPC64 */
}
static int ptdump_show(struct seq_file *m, void *v)
{
struct pg_state st = {
.seq = m,
.marker = address_markers,
};
if (radix_enabled())
st.start_address = PAGE_OFFSET;
else
st.start_address = KERN_VIRT_START;
/* Traverse kernel page tables */
walk_pagetables(&st);
note_page(&st, 0, 0, 0);
return 0;
}
static int ptdump_open(struct inode *inode, struct file *file)
{
return single_open(file, ptdump_show, NULL);
}
static const struct file_operations ptdump_fops = {
.open = ptdump_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static void build_pgtable_complete_mask(void)
{
unsigned int i, j;
for (i = 0; i < ARRAY_SIZE(pg_level); i++)
if (pg_level[i].flag)
for (j = 0; j < pg_level[i].num; j++)
pg_level[i].mask |= pg_level[i].flag[j].mask;
}
static int ptdump_init(void)
{
struct dentry *debugfs_file;
populate_markers();
build_pgtable_complete_mask();
debugfs_file = debugfs_create_file("kernel_page_tables", 0400, NULL,
NULL, &ptdump_fops);
return debugfs_file ? 0 : -ENOMEM;
}
device_initcall(ptdump_init);

19
arch/powerpc/mm/ptdump/ptdump.h Normal file
View File

@@ -0,0 +1,19 @@
/* SPDX-License-Identifier: GPL-2.0 */
#include <linux/types.h>
struct flag_info {
u64 mask;
u64 val;
const char *set;
const char *clear;
bool is_val;
int shift;
};
struct pgtable_level {
const struct flag_info *flag;
size_t num;
u64 mask;
};
extern struct pgtable_level pg_level[5];

64
arch/powerpc/mm/ptdump/segment_regs.c Normal file
View File

@@ -0,0 +1,64 @@
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2018, Christophe Leroy CS S.I.
* <christophe.leroy@c-s.fr>
*
* This dumps the content of Segment Registers
*/
#include <asm/debugfs.h>
static void seg_show(struct seq_file *m, int i)
{
u32 val = mfsrin(i << 28);
seq_printf(m, "0x%01x0000000-0x%01xfffffff ", i, i);
seq_printf(m, "Kern key %d ", (val >> 30) & 1);
seq_printf(m, "User key %d ", (val >> 29) & 1);
if (val & 0x80000000) {
seq_printf(m, "Device 0x%03x", (val >> 20) & 0x1ff);
seq_printf(m, "-0x%05x", val & 0xfffff);
} else {
if (val & 0x10000000)
seq_puts(m, "No Exec ");
seq_printf(m, "VSID 0x%06x", val & 0xffffff);
}
seq_puts(m, "\n");
}
static int sr_show(struct seq_file *m, void *v)
{
int i;
seq_puts(m, "---[ User Segments ]---\n");
for (i = 0; i < TASK_SIZE >> 28; i++)
seg_show(m, i);
seq_puts(m, "\n---[ Kernel Segments ]---\n");
for (; i < 16; i++)
seg_show(m, i);
return 0;
}
static int sr_open(struct inode *inode, struct file *file)
{
return single_open(file, sr_show, NULL);
}
static const struct file_operations sr_fops = {
.open = sr_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int __init sr_init(void)
{
struct dentry *debugfs_file;
debugfs_file = debugfs_create_file("segment_registers", 0400,
powerpc_debugfs_root, NULL, &sr_fops);
return debugfs_file ? 0 : -ENOMEM;
}
device_initcall(sr_init);

80
arch/powerpc/mm/ptdump/shared.c Normal file
View File

@@ -0,0 +1,80 @@
// SPDX-License-Identifier: GPL-2.0
/*
* From split of dump_linuxpagetables.c
* Copyright 2016, Rashmica Gupta, IBM Corp.
*
*/
#include <linux/kernel.h>
#include <asm/pgtable.h>
#include "ptdump.h"
static const struct flag_info flag_array[] = {
{
.mask = _PAGE_USER,
.val = _PAGE_USER,
.set = "user",
.clear = " ",
}, {
.mask = _PAGE_RW,
.val = _PAGE_RW,
.set = "rw",
.clear = "r ",
}, {
.mask = _PAGE_EXEC,
.val = _PAGE_EXEC,
.set = " X ",
.clear = " ",
}, {
.mask = _PAGE_PRESENT,
.val = _PAGE_PRESENT,
.set = "present",
.clear = " ",
}, {
.mask = _PAGE_GUARDED,
.val = _PAGE_GUARDED,
.set = "guarded",
.clear = " ",
}, {
.mask = _PAGE_DIRTY,
.val = _PAGE_DIRTY,
.set = "dirty",
.clear = " ",
}, {
.mask = _PAGE_ACCESSED,
.val = _PAGE_ACCESSED,
.set = "accessed",
.clear = " ",
}, {
.mask = _PAGE_WRITETHRU,
.val = _PAGE_WRITETHRU,
.set = "write through",
.clear = " ",
}, {
.mask = _PAGE_NO_CACHE,
.val = _PAGE_NO_CACHE,
.set = "no cache",
.clear = " ",
}, {
.mask = _PAGE_SPECIAL,
.val = _PAGE_SPECIAL,
.set = "special",
}
};
struct pgtable_level pg_level[5] = {
{
}, { /* pgd */
.flag = flag_array,
.num = ARRAY_SIZE(flag_array),
}, { /* pud */
.flag = flag_array,
.num = ARRAY_SIZE(flag_array),
}, { /* pmd */
.flag = flag_array,
.num = ARRAY_SIZE(flag_array),
}, { /* pte */
.flag = flag_array,
.num = ARRAY_SIZE(flag_array),
},
};