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-rw-r--r--arch/powerpc/mm/ptdump/8xx.c92
-rw-r--r--arch/powerpc/mm/ptdump/Makefile9
-rw-r--r--arch/powerpc/mm/ptdump/bats.c109
-rw-r--r--arch/powerpc/mm/ptdump/book3s64.c120
-rw-r--r--arch/powerpc/mm/ptdump/hashpagetable.c550
-rw-r--r--arch/powerpc/mm/ptdump/ptdump.c472
-rw-r--r--arch/powerpc/mm/ptdump/ptdump.h22
-rw-r--r--arch/powerpc/mm/ptdump/segment_regs.c62
-rw-r--r--arch/powerpc/mm/ptdump/shared.c85
9 files changed, 1521 insertions, 0 deletions
diff --git a/arch/powerpc/mm/ptdump/8xx.c b/arch/powerpc/mm/ptdump/8xx.c
new file mode 100644
index 000000000..86da2a669
--- /dev/null
+++ b/arch/powerpc/mm/ptdump/8xx.c
@@ -0,0 +1,92 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * From split of dump_linuxpagetables.c
+ * Copyright 2016, Rashmica Gupta, IBM Corp.
+ *
+ */
+#include <linux/kernel.h>
+#include <linux/pgtable.h>
+
+#include "ptdump.h"
+
+static const struct flag_info flag_array[] = {
+ {
+#ifdef CONFIG_PPC_16K_PAGES
+ .mask = _PAGE_HUGE,
+ .val = _PAGE_HUGE,
+#else
+ .mask = _PAGE_SPS,
+ .val = _PAGE_SPS,
+#endif
+ .set = "huge",
+ .clear = " ",
+ }, {
+ .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),
+ },
+};
diff --git a/arch/powerpc/mm/ptdump/Makefile b/arch/powerpc/mm/ptdump/Makefile
new file mode 100644
index 000000000..712762be3
--- /dev/null
+++ b/arch/powerpc/mm/ptdump/Makefile
@@ -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
diff --git a/arch/powerpc/mm/ptdump/bats.c b/arch/powerpc/mm/ptdump/bats.c
new file mode 100644
index 000000000..c4c628b03
--- /dev/null
+++ b/arch/powerpc/mm/ptdump/bats.c
@@ -0,0 +1,109 @@
+// 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 <linux/pgtable.h>
+#include <asm/debugfs.h>
+#include <asm/cpu_has_feature.h>
+
+#include "ptdump.h"
+
+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
+ pt_dump_size(m, size);
+
+ 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 ? "r " : " x ");
+ else if (lower & BPP_RW)
+ seq_puts(m, is_d ? "rw " : " x ");
+ else
+ seq_puts(m, is_d ? " " : " ");
+
+ seq_puts(m, lower & _PAGE_WRITETHRU ? "w " : " ");
+ seq_puts(m, lower & _PAGE_NO_CACHE ? "i " : " ");
+ seq_puts(m, lower & _PAGE_COHERENT ? "m " : " ");
+ seq_puts(m, lower & _PAGE_GUARDED ? "g " : " ");
+ 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)
+{
+ 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)
+{
+ debugfs_create_file("block_address_translation", 0400,
+ powerpc_debugfs_root, NULL, &bats_fops);
+ return 0;
+}
+device_initcall(bats_init);
diff --git a/arch/powerpc/mm/ptdump/book3s64.c b/arch/powerpc/mm/ptdump/book3s64.c
new file mode 100644
index 000000000..14f73868d
--- /dev/null
+++ b/arch/powerpc/mm/ptdump/book3s64.c
@@ -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 <linux/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),
+ },
+};
diff --git a/arch/powerpc/mm/ptdump/hashpagetable.c b/arch/powerpc/mm/ptdump/hashpagetable.c
new file mode 100644
index 000000000..ad6df9a2e
--- /dev/null
+++ b/arch/powerpc/mm/ptdump/hashpagetable.c
@@ -0,0 +1,550 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * 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.
+ */
+#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 <linux/const.h>
+#include <asm/page.h>
+#include <asm/plpar_wrappers.h>
+#include <linux/memblock.h>
+#include <asm/firmware.h>
+#include <asm/pgalloc.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;
+}
+
+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)
+ 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;
+}
+
+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)
+{
+ if (IS_ENABLED(CONFIG_PPC_PSERIES) && firmware_has_feature(FW_FEATURE_LPAR))
+ return pseries_find(ea, psize, primary, v, r);
+
+ 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, false, &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;
+
+ /* check for secret 4K mappings */
+ if (IS_ENABLED(CONFIG_PPC_64K_PAGES) &&
+ ((pteval & H_PAGE_COMBO) == H_PAGE_COMBO ||
+ (pteval & H_PAGE_4K_PFN) == H_PAGE_4K_PFN))
+ psize = mmu_io_psize;
+
+ /* 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, 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 exists */
+ walk_pmd(st, pud, addr);
+ }
+}
+
+static void walk_p4d(struct pg_state *st, pgd_t *pgd, unsigned long start)
+{
+ p4d_t *p4d = p4d_offset(pgd, 0);
+ unsigned long addr;
+ unsigned int i;
+
+ for (i = 0; i < PTRS_PER_P4D; i++, p4d++) {
+ addr = start + i * P4D_SIZE;
+ if (!p4d_none(*p4d))
+ /* p4d exists */
+ walk_pud(st, p4d, 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_p4d(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)
+{
+ struct vmemmap_backing *ptr = vmemmap_list;
+
+ if (!IS_ENABLED(CONFIG_SPARSEMEM_VMEMMAP))
+ return;
+ /*
+ * 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");
+}
+
+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;
+ address_markers[9].start_address = H_VMEMMAP_START;
+}
+
+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)
+{
+ if (!radix_enabled()) {
+ populate_markers();
+ debugfs_create_file("kernel_hash_pagetable", 0400, NULL, NULL,
+ &ptdump_fops);
+ }
+ return 0;
+}
+device_initcall(ptdump_init);
diff --git a/arch/powerpc/mm/ptdump/ptdump.c b/arch/powerpc/mm/ptdump/ptdump.c
new file mode 100644
index 000000000..aca354fb6
--- /dev/null
+++ b/arch/powerpc/mm/ptdump/ptdump.c
@@ -0,0 +1,472 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * 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.
+ */
+#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 <linux/const.h>
+#include <asm/page.h>
+#include <asm/hugetlb.h>
+
+#include <mm/mmu_decl.h>
+
+#include "ptdump.h"
+
+/*
+ * 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 long page_size;
+ unsigned int level;
+ u64 current_flags;
+ bool check_wx;
+ unsigned long wx_pages;
+};
+
+struct addr_marker {
+ unsigned long start_address;
+ const char *name;
+};
+
+static struct addr_marker address_markers[] = {
+ { 0, "Start of kernel VM" },
+#ifdef MODULES_VADDR
+ { 0, "modules start" },
+ { 0, "modules end" },
+#endif
+ { 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_HIGHMEM
+ { 0, "Highmem PTEs start" },
+ { 0, "Highmem PTEs end" },
+#endif
+ { 0, "Fixmap start" },
+ { 0, "Fixmap end" },
+#endif
+#ifdef CONFIG_KASAN
+ { 0, "kasan shadow mem start" },
+ { 0, "kasan shadow mem end" },
+#endif
+ { -1, NULL },
+};
+
+#define pt_dump_seq_printf(m, fmt, args...) \
+({ \
+ if (m) \
+ seq_printf(m, fmt, ##args); \
+})
+
+#define pt_dump_seq_putc(m, c) \
+({ \
+ if (m) \
+ seq_putc(m, c); \
+})
+
+void pt_dump_size(struct seq_file *m, unsigned long size)
+{
+ static const char units[] = "KMGTPE";
+ const char *unit = units;
+
+ /* Work out what appropriate unit to use */
+ while (!(size & 1023) && unit[1]) {
+ size >>= 10;
+ unit++;
+ }
+ pt_dump_seq_printf(m, "%9lu%c ", size, *unit);
+}
+
+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;
+ pt_dump_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)
+ pt_dump_seq_printf(st->seq, " %s", s);
+ }
+ st->current_flags &= ~flag->mask;
+ }
+ if (st->current_flags != 0)
+ pt_dump_seq_printf(st->seq, " unknown flags:%llx", st->current_flags);
+}
+
+static void dump_addr(struct pg_state *st, unsigned long addr)
+{
+ unsigned long delta;
+
+#ifdef CONFIG_PPC64
+#define REG "0x%016lx"
+#else
+#define REG "0x%08lx"
+#endif
+
+ pt_dump_seq_printf(st->seq, REG "-" REG " ", st->start_address, addr - 1);
+ if (st->start_pa == st->last_pa && st->start_address + st->page_size != addr) {
+ pt_dump_seq_printf(st->seq, "[" REG "]", st->start_pa);
+ delta = st->page_size >> 10;
+ } else {
+ pt_dump_seq_printf(st->seq, " " REG " ", st->start_pa);
+ delta = (addr - st->start_address) >> 10;
+ }
+ pt_dump_size(st->seq, delta);
+}
+
+static void note_prot_wx(struct pg_state *st, unsigned long addr)
+{
+ pte_t pte = __pte(st->current_flags);
+
+ if (!IS_ENABLED(CONFIG_PPC_DEBUG_WX) || !st->check_wx)
+ return;
+
+ if (!pte_write(pte) || !pte_exec(pte))
+ return;
+
+ WARN_ONCE(1, "powerpc/mm: Found insecure W+X mapping at address %p/%pS\n",
+ (void *)st->start_address, (void *)st->start_address);
+
+ st->wx_pages += (addr - st->start_address) / PAGE_SIZE;
+}
+
+static void note_page_update_state(struct pg_state *st, unsigned long addr,
+ unsigned int level, u64 val, unsigned long page_size)
+{
+ u64 flag = val & pg_level[level].mask;
+ u64 pa = val & PTE_RPN_MASK;
+
+ st->level = level;
+ st->current_flags = flag;
+ st->start_address = addr;
+ st->start_pa = pa;
+ st->page_size = page_size;
+
+ while (addr >= st->marker[1].start_address) {
+ st->marker++;
+ pt_dump_seq_printf(st->seq, "---[ %s ]---\n", st->marker->name);
+ }
+}
+
+static void note_page(struct pg_state *st, unsigned long addr,
+ unsigned int level, u64 val, unsigned long page_size)
+{
+ u64 flag = val & pg_level[level].mask;
+ u64 pa = val & PTE_RPN_MASK;
+
+ /* At first no level is set */
+ if (!st->level) {
+ pt_dump_seq_printf(st->seq, "---[ %s ]---\n", st->marker->name);
+ note_page_update_state(st, addr, level, val, page_size);
+ /*
+ * 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 + st->page_size &&
+ (pa != st->start_pa || st->start_pa != st->last_pa))) {
+
+ /* Check the PTE flags */
+ if (st->current_flags) {
+ note_prot_wx(st, addr);
+ 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);
+
+ pt_dump_seq_putc(st->seq, '\n');
+ }
+
+ /*
+ * Address indicates we have passed the end of the
+ * current section of virtual memory
+ */
+ note_page_update_state(st, addr, level, val, page_size);
+ }
+ 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), 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;
+
+#ifdef CONFIG_PPC64
+ address_markers[i++].start_address = PAGE_OFFSET;
+#else
+ address_markers[i++].start_address = TASK_SIZE;
+#endif
+#ifdef MODULES_VADDR
+ address_markers[i++].start_address = MODULES_VADDR;
+ address_markers[i++].start_address = MODULES_END;
+#endif
+ 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;
+ /* What is the ifdef about? */
+#ifdef CONFIG_PPC_BOOK3S_64
+ address_markers[i++].start_address = H_VMEMMAP_START;
+#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_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;
+#ifdef CONFIG_KASAN
+ address_markers[i++].start_address = KASAN_SHADOW_START;
+ address_markers[i++].start_address = KASAN_SHADOW_END;
+#endif
+#endif /* CONFIG_PPC64 */
+}
+
+static int ptdump_show(struct seq_file *m, void *v)
+{
+ struct pg_state st = {
+ .seq = m,
+ .marker = address_markers,
+ .start_address = IS_ENABLED(CONFIG_PPC64) ? PAGE_OFFSET : TASK_SIZE,
+ };
+
+#ifdef CONFIG_PPC64
+ if (!radix_enabled())
+ st.start_address = KERN_VIRT_START;
+#endif
+
+ /* Traverse kernel page tables */
+ walk_pagetables(&st);
+ note_page(&st, 0, 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;
+}
+
+#ifdef CONFIG_PPC_DEBUG_WX
+void ptdump_check_wx(void)
+{
+ struct pg_state st = {
+ .seq = NULL,
+ .marker = address_markers,
+ .check_wx = true,
+ .start_address = IS_ENABLED(CONFIG_PPC64) ? PAGE_OFFSET : TASK_SIZE,
+ };
+
+#ifdef CONFIG_PPC64
+ if (!radix_enabled())
+ st.start_address = KERN_VIRT_START;
+#endif
+
+ walk_pagetables(&st);
+
+ if (st.wx_pages)
+ pr_warn("Checked W+X mappings: FAILED, %lu W+X pages found\n",
+ st.wx_pages);
+ else
+ pr_info("Checked W+X mappings: passed, no W+X pages found\n");
+}
+#endif
+
+static int ptdump_init(void)
+{
+ populate_markers();
+ build_pgtable_complete_mask();
+ debugfs_create_file("kernel_page_tables", 0400, NULL, NULL,
+ &ptdump_fops);
+ return 0;
+}
+device_initcall(ptdump_init);
diff --git a/arch/powerpc/mm/ptdump/ptdump.h b/arch/powerpc/mm/ptdump/ptdump.h
new file mode 100644
index 000000000..154efae96
--- /dev/null
+++ b/arch/powerpc/mm/ptdump/ptdump.h
@@ -0,0 +1,22 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#include <linux/types.h>
+#include <linux/seq_file.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];
+
+void pt_dump_size(struct seq_file *m, unsigned long delta);
diff --git a/arch/powerpc/mm/ptdump/segment_regs.c b/arch/powerpc/mm/ptdump/segment_regs.c
new file mode 100644
index 000000000..dde2fe8de
--- /dev/null
+++ b/arch/powerpc/mm/ptdump/segment_regs.c
@@ -0,0 +1,62 @@
+// 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)
+{
+ debugfs_create_file("segment_registers", 0400, powerpc_debugfs_root,
+ NULL, &sr_fops);
+ return 0;
+}
+device_initcall(sr_init);
diff --git a/arch/powerpc/mm/ptdump/shared.c b/arch/powerpc/mm/ptdump/shared.c
new file mode 100644
index 000000000..ae97b8296
--- /dev/null
+++ b/arch/powerpc/mm/ptdump/shared.c
@@ -0,0 +1,85 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * From split of dump_linuxpagetables.c
+ * Copyright 2016, Rashmica Gupta, IBM Corp.
+ *
+ */
+#include <linux/kernel.h>
+#include <linux/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 = 0,
+ .set = "r ",
+ .clear = "rw",
+ }, {
+ .mask = _PAGE_EXEC,
+ .val = _PAGE_EXEC,
+ .set = " X ",
+ .clear = " ",
+ }, {
+ .mask = _PAGE_PRESENT,
+ .val = _PAGE_PRESENT,
+ .set = "present",
+ .clear = " ",
+ }, {
+ .mask = _PAGE_COHERENT,
+ .val = _PAGE_COHERENT,
+ .set = "coherent",
+ .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),
+ },
+};
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-10 08:00:41 +0000