There are 2 ways to iterate vm_area_struct: 1) by rbtree, aka vma.vm_rb; 2) by linked list, aka vma.vm_prev/next. However for linux maple tree patch[1][2], vm_rb and vm_prev/next are removed from vm_area_struct. For memory.c:vm_area_dump of crash, it mainly uses linked list as a way of vma iteration, which will not work for this case. So maple tree iteration need to be ported to crash. For crash, currently it only iteratively read the maple tree, no more rcu safe or maple tree modification features needed. So we only port a subset of kernel maple tree features. In addition, we need to modify the ported kernel source code, making it compatible with crash. The formal crash way of vmcore struct member resolving is: readmem(node, KVADDR, buf, SIZE(buf), "", flag); return buf + OFFSET(member); which is the reimplementation of kernel way of member resolving: return node->member; The 1st one is arch independent, it uses gdb to resolve the OFFSET of members, so crash don't need to know what the inside of the struct is, even if the struct changes for new kernel version. The 2nd one is arch dependent, the struct need to be ported to crash, and the OFFSET of members may differ between crash and kernel due to padding/ alignment or optimization reasons. This patch deals with the 2 issues: 1) Poring mt_dump() function, and all its dependencies from kernel source[3] to crash, to enable crash maple tree iteration, 2) adapting the ported code with crash. [1]: https://github.com/oracle/linux-uek/commit/d19703645b80abe35dff1a88449d07... [2]: https://github.com/oracle/linux-uek/commit/91dee01f1ebb6b6587463b6ee6f7bb... [3]: https://github.com/oracle/linux-uek, maple/mainline branch Signed-off-by: Tao Liu <ltao(a)redhat.com&gt; --- Makefile | 10 +- defs.h | 19 +++ maple_tree.c | 407 +++++++++++++++++++++++++++++++++++++++++++++++++++ maple_tree.h | 82 +++++++++++ 4 files changed, 515 insertions(+), 3 deletions(-) create mode 100644 maple_tree.c create mode 100644 maple_tree.h diff --git a/Makefile b/Makefile index 1506dd4..102597f 100644 --- a/Makefile +++ b/Makefile @@ -59,6 +59,7 @@ IBM_HFILES=ibm_common.h SADUMP_HFILES=sadump.h UNWIND_HFILES=unwind.h unwind_i.h rse.h unwind_x86.h unwind_x86_64.h VMWARE_HFILES=vmware_vmss.h +MAPLE_TREE_HFILES=maple_tree.h CFILES=main.c tools.c global_data.c memory.c filesys.c help.c task.c \ kernel.c test.c gdb_interface.c configure.c net.c dev.c bpf.c \ @@ -73,12 +74,12 @@ CFILES=main.c tools.c global_data.c memory.c filesys.c help.c task.c \ xen_hyper.c xen_hyper_command.c xen_hyper_global_data.c \ xen_hyper_dump_tables.c kvmdump.c qemu.c qemu-load.c sadump.c ipcs.c \ ramdump.c vmware_vmss.c vmware_guestdump.c \ - xen_dom0.c kaslr_helper.c sbitmap.c + xen_dom0.c kaslr_helper.c sbitmap.c maple_tree.c SOURCE_FILES=${CFILES} ${GENERIC_HFILES} ${MCORE_HFILES} \ ${REDHAT_CFILES} ${REDHAT_HFILES} ${UNWIND_HFILES} \ ${LKCD_DUMP_HFILES} ${LKCD_TRACE_HFILES} ${LKCD_OBSOLETE_HFILES}\ - ${IBM_HFILES} ${SADUMP_HFILES} ${VMWARE_HFILES} + ${IBM_HFILES} ${SADUMP_HFILES} ${VMWARE_HFILES} ${MAPLE_TREE_HFILES} OBJECT_FILES=main.o tools.o global_data.o memory.o filesys.o help.o task.o \ build_data.o kernel.o test.o gdb_interface.o net.o dev.o bpf.o \ @@ -93,7 +94,7 @@ OBJECT_FILES=main.o tools.o global_data.o memory.o filesys.o help.o task.o \ xen_hyper.o xen_hyper_command.o xen_hyper_global_data.o \ xen_hyper_dump_tables.o kvmdump.o qemu.o qemu-load.o sadump.o ipcs.o \ ramdump.o vmware_vmss.o vmware_guestdump.o \ - xen_dom0.o kaslr_helper.o sbitmap.o + xen_dom0.o kaslr_helper.o sbitmap.o maple_tree.o MEMORY_DRIVER_FILES=memory_driver/Makefile memory_driver/crash.c memory_driver/README @@ -539,6 +540,9 @@ kaslr_helper.o: ${GENERIC_HFILES} kaslr_helper.c bpf.o: ${GENERIC_HFILES} bpf.c ${CC} -c ${CRASH_CFLAGS} bpf.c ${WARNING_OPTIONS} ${WARNING_ERROR} +maple_tree.o: ${GENERIC_HFILES} ${MAPLE_TREE_HFILES} maple_tree.c + ${CC} -c ${CRASH_CFLAGS} maple_tree.c ${WARNING_OPTIONS} ${WARNING_ERROR} + ${PROGRAM}: force @$(MAKE) all diff --git a/defs.h b/defs.h index 08ac4dc..46bfd4a 100644 --- a/defs.h +++ b/defs.h @@ -2189,6 +2189,21 @@ struct offset_table { /* stash of commonly-used offsets */ long request_queue_hctx_table; long percpu_counter_counters; long slab_slab_list; + long mm_struct_mm_mt; + long maple_tree_ma_root; + long maple_tree_ma_flags; + long maple_node_parent; + long maple_node_ma64; + long maple_node_mr64; + long maple_node_slot; + long maple_arange_64_pivot; + long maple_arange_64_slot; + long maple_arange_64_gap; + long maple_arange_64_meta; + long maple_range_64_pivot; + long maple_range_64_slot; + long maple_metadata_end; + long maple_metadata_gap; }; struct size_table { /* stash of commonly-used sizes */ @@ -2360,6 +2375,8 @@ struct size_table { /* stash of commonly-used sizes */ long sbq_wait_state; long blk_mq_tags; long percpu_counter; + long maple_tree; + long maple_node; }; struct array_table { @@ -5742,6 +5759,8 @@ int file_dump(ulong, ulong, ulong, int, int); int same_file(char *, char *); int cleanup_memory_driver(void); +void maple_init(void); +int do_mptree(struct tree_data *); /* * help.c diff --git a/maple_tree.c b/maple_tree.c new file mode 100644 index 0000000..502172f --- /dev/null +++ b/maple_tree.c @@ -0,0 +1,407 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Maple Tree implementation + * Copyright (c) 2018-2022 Oracle Corporation + * Authors: Liam R. Howlett <Liam.Howlett(a)oracle.com&gt; + * Matthew Wilcox <willy(a)infradead.org&gt; + * + * The following are copied and modified from lib/maple_tree.c + */ + +#include "maple_tree.h" +#include "defs.h" + +unsigned char *mt_slots = NULL; +unsigned char *mt_pivots = NULL; +ulong mt_max[4] = {0}; + +#define MAPLE_BUFSIZE 512 + +static inline ulong mte_to_node(ulong maple_enode_entry) +{ + return maple_enode_entry & ~MAPLE_NODE_MASK; +} + +static inline enum maple_type mte_node_type(ulong maple_enode_entry) +{ + return (maple_enode_entry >> MAPLE_NODE_TYPE_SHIFT) & + MAPLE_NODE_TYPE_MASK; +} + +static inline ulong mt_slot(void **slots, unsigned char offset) +{ + return (ulong)slots[offset]; +} + +static inline bool ma_is_leaf(const enum maple_type type) +{ + return type < maple_range_64; +} + +/***************For cmd_tree********************/ + +struct maple_tree_ops { + void (*entry)(ulong node, ulong slot, const char *path, + ulong index, void *private); + void *private; + bool is_td; +}; + +static const char spaces[] = " "; + +static void do_mt_range64(ulong, ulong, ulong, uint, char *, ulong *, + struct maple_tree_ops *); +static void do_mt_arange64(ulong, ulong, ulong, uint, char *, ulong *, + struct maple_tree_ops *); +static void do_mt_entry(ulong, ulong, ulong, uint, uint, char *, ulong *, + struct maple_tree_ops *); +static void do_mt_node(ulong, ulong, ulong, uint, char *, ulong *, + struct maple_tree_ops *); +struct req_entry *fill_member_offsets(char *); +void dump_struct_members_fast(struct req_entry *, int, ulong); +void dump_struct_members_for_tree(struct tree_data *, int, ulong); + +static void mt_dump_range(ulong min, ulong max, uint depth) +{ + if (min == max) + fprintf(fp, "%.*s%lu: ", depth * 2, spaces, min); + else + fprintf(fp, "%.*s%lu-%lu: ", depth * 2, spaces, min, max); +} + +static inline bool mt_is_reserved(ulong entry) +{ + return (entry < MAPLE_RESERVED_RANGE) && xa_is_internal(entry); +} + +static inline bool mte_is_leaf(ulong maple_enode_entry) +{ + return ma_is_leaf(mte_node_type(maple_enode_entry)); +} + +static uint mt_height(char *mt_buf) +{ + return (UINT(mt_buf + OFFSET(maple_tree_ma_flags)) & + MT_FLAGS_HEIGHT_MASK) + >> MT_FLAGS_HEIGHT_OFFSET; +} + +static void dump_mt_range64(char *mr64_buf) +{ + int i; + + fprintf(fp, " contents: "); + for (i = 0; i < mt_slots[maple_range_64] - 1; i++) + fprintf(fp, "%p %lu ", + VOID_PTR(mr64_buf + OFFSET(maple_range_64_slot) + + sizeof(void *) * i), + ULONG(mr64_buf + OFFSET(maple_range_64_pivot) + + sizeof(ulong *) * i)); + fprintf(fp, "%p\n", VOID_PTR(mr64_buf + OFFSET(maple_range_64_slot) + + sizeof(void *) * i)); +} + +static void dump_mt_arange64(char *ma64_buf) +{ + int i; + + fprintf(fp, " contents: "); + for (i = 0; i < mt_slots[maple_arange_64]; i++) + fprintf(fp, "%lu ", ULONG(ma64_buf + OFFSET(maple_arange_64_gap) + + sizeof(ulong *) * i)); + + fprintf(fp, "| %02X %02X| ", + UCHAR(ma64_buf + OFFSET(maple_arange_64_meta) + + OFFSET(maple_metadata_end)), + UCHAR(ma64_buf + OFFSET(maple_arange_64_meta) + + OFFSET(maple_metadata_gap))); + + for (i = 0; i < mt_slots[maple_arange_64] - 1; i++) + fprintf(fp, "%p %lu ", + VOID_PTR(ma64_buf + OFFSET(maple_arange_64_slot) + + sizeof(void *) * i), + ULONG(ma64_buf + OFFSET(maple_arange_64_pivot) + + sizeof(ulong *) * i)); + fprintf(fp, "%p\n", VOID_PTR(ma64_buf + OFFSET(maple_arange_64_slot) + + sizeof(void *) * i)); +} + +static void dump_mt_entry(ulong entry, ulong min, ulong max, uint depth) +{ + mt_dump_range(min, max, depth); + + if (xa_is_value(entry)) + fprintf(fp, "value %ld (0x%lx) [0x%lx]\n", xa_to_value(entry), + xa_to_value(entry), entry); + else if (xa_is_zero(entry)) + fprintf(fp, "zero (%ld)\n", xa_to_internal(entry)); + else if (mt_is_reserved(entry)) + fprintf(fp, "UNKNOWN ENTRY (0x%lx)\n", entry); + else + fprintf(fp, "0x%lx\n", entry); +} + +static void dump_mt_node(ulong maple_node, char *node_data, uint type, + ulong min, ulong max, uint depth) +{ + mt_dump_range(min, max, depth); + + fprintf(fp, "node 0x%lx depth %d type %d parent %p", + maple_node, depth, type, + maple_node ? VOID_PTR(node_data + OFFSET(maple_node_parent)) : + NULL); +} + +static void do_mt_range64(ulong entry, ulong min, ulong max, + uint depth, char *path, ulong *global_index, + struct maple_tree_ops *ops) +{ + ulong maple_node_m_node = mte_to_node(entry); + char node_buf[MAPLE_BUFSIZE]; + bool leaf = mte_is_leaf(entry); + ulong first = min, last; + int i; + int len = strlen(path); + struct tree_data *td = ops->is_td ? (struct tree_data *)ops->private : NULL; + char *mr64_buf; + + if (SIZE(maple_node) > MAPLE_BUFSIZE) + error(FATAL, "MAPLE_BUFSIZE should be larger than maple_node struct"); + + readmem(maple_node_m_node, KVADDR, node_buf, SIZE(maple_node), + "mt_dump_range64 read maple_node", FAULT_ON_ERROR); + + mr64_buf = node_buf + OFFSET(maple_node_mr64); + + for (i = 0; i < mt_slots[maple_range_64]; i++) { + last = max; + + if (i < (mt_slots[maple_range_64] - 1)) + last = ULONG(mr64_buf + OFFSET(maple_range_64_pivot) + + sizeof(ulong *) * i); + + else if (!VOID_PTR(mr64_buf + OFFSET(maple_range_64_slot) + + sizeof(void *) * i) && + max != mt_max[mte_node_type(entry)]) + break; + if (last == 0 && i > 0) + break; + if (leaf) + do_mt_entry(mt_slot((void **)(mr64_buf + + OFFSET(maple_range_64_slot)), i), + first, last, depth + 1, i, path, global_index, ops); + else if (VOID_PTR(mr64_buf + OFFSET(maple_range_64_slot) + + sizeof(void *) * i)) { + sprintf(path + len, "/%d", i); + do_mt_node(mt_slot((void **)(mr64_buf + + OFFSET(maple_range_64_slot)), i), + first, last, depth + 1, path, global_index, ops); + } + + if (last == max) + break; + if (last > max) { + fprintf(fp, "node %p last (%lu) > max (%lu) at pivot %d!\n", + mr64_buf, last, max, i); + break; + } + first = last + 1; + } +} + +static void do_mt_arange64(ulong entry, ulong min, ulong max, + uint depth, char *path, ulong *global_index, + struct maple_tree_ops *ops) +{ + ulong maple_node_m_node = mte_to_node(entry); + char node_buf[MAPLE_BUFSIZE]; + bool leaf = mte_is_leaf(entry); + ulong first = min, last; + int i; + int len = strlen(path); + struct tree_data *td = ops->is_td ? (struct tree_data *)ops->private : NULL; + char *ma64_buf; + + if (SIZE(maple_node) > MAPLE_BUFSIZE) + error(FATAL, "MAPLE_BUFSIZE should be larger than maple_node struct"); + + readmem(maple_node_m_node, KVADDR, node_buf, SIZE(maple_node), + "mt_dump_arange64 read maple_node", FAULT_ON_ERROR); + + ma64_buf = node_buf + OFFSET(maple_node_ma64); + + for (i = 0; i < mt_slots[maple_arange_64]; i++) { + last = max; + + if (i < (mt_slots[maple_arange_64] - 1)) + last = ULONG(ma64_buf + OFFSET(maple_arange_64_pivot) + + sizeof(ulong *) * i); + else if (!VOID_PTR(ma64_buf + OFFSET(maple_arange_64_slot) + + sizeof(void *) * i)) + break; + if (last == 0 && i > 0) + break; + + if (leaf) + do_mt_entry(mt_slot((void **)(ma64_buf + + OFFSET(maple_arange_64_slot)), i), + first, last, depth + 1, i, path, global_index, ops); + else if (VOID_PTR(ma64_buf + OFFSET(maple_arange_64_slot) + + sizeof(void *) * i)) { + sprintf(path + len, "/%d", i); + do_mt_node(mt_slot((void **)(ma64_buf + + OFFSET(maple_arange_64_slot)), i), + first, last, depth + 1, path, global_index, ops); + } + + if (last == max) + break; + if (last > max) { + fprintf(fp, "node %p last (%lu) > max (%lu) at pivot %d!\n", + ma64_buf, last, max, i); + break; + } + first = last + 1; + } +} + +static void do_mt_entry(ulong entry, ulong min, ulong max, uint depth, + uint index, char *path, ulong *global_index, + struct maple_tree_ops *ops) +{ + int print_radix = 0, i; + static struct req_entry **e = NULL; + struct tree_data *td = ops->is_td ? (struct tree_data *)ops->private : NULL; + + if (!td) + return; +} + +static void do_mt_node(ulong entry, ulong min, ulong max, + uint depth, char *path, ulong *global_index, + struct maple_tree_ops *ops) +{ + ulong maple_node = mte_to_node(entry); + uint type = mte_node_type(entry); + uint i; + char node_buf[MAPLE_BUFSIZE]; + struct tree_data *td = ops->is_td ? (struct tree_data *)ops->private : NULL; + + if (SIZE(maple_node) > MAPLE_BUFSIZE) + error(FATAL, "MAPLE_BUFSIZE should be larger than maple_node struct"); + + readmem(maple_node, KVADDR, node_buf, SIZE(maple_node), + "mt_dump_node read maple_node", FAULT_ON_ERROR); + + switch (type) { + case maple_dense: + for (i = 0; i < mt_slots[maple_dense]; i++) { + if (min + i > max) + fprintf(fp, "OUT OF RANGE: "); + do_mt_entry(mt_slot((void **)(node_buf + OFFSET(maple_node_slot)), i), + min + i, min + i, depth, i, path, global_index, ops); + } + break; + case maple_leaf_64: + case maple_range_64: + do_mt_range64(entry, min, max, depth, path, global_index, ops); + break; + case maple_arange_64: + do_mt_arange64(entry, min, max, depth, path, global_index, ops); + break; + default: + fprintf(fp, " UNKNOWN TYPE\n"); + } +} + +static int do_maple_tree_traverse(ulong ptr, int is_root, + struct maple_tree_ops *ops) +{ + char path[BUFSIZE] = {0}; + char tree_buf[MAPLE_BUFSIZE]; + ulong entry; + struct tree_data *td = ops->is_td ? (struct tree_data *)ops->private : NULL; + ulong global_index = 0; + + if (SIZE(maple_tree) > MAPLE_BUFSIZE) + error(FATAL, "MAPLE_BUFSIZE should be larger than maple_tree struct"); + + if (!is_root) { + strcpy(path, "direct"); + do_mt_node(ptr, 0, mt_max[mte_node_type(ptr)], + 0, path, &global_index, ops); + } else { + readmem(ptr, KVADDR, tree_buf, SIZE(maple_tree), + "mt_dump read maple_tree", FAULT_ON_ERROR); + entry = ULONG(tree_buf + OFFSET(maple_tree_ma_root)); + + if (!xa_is_node(entry)) + do_mt_entry(entry, 0, 0, 0, 0, path, &global_index, ops); + else if (entry) { + strcpy(path, "root"); + do_mt_node(entry, 0, mt_max[mte_node_type(entry)], 0, + path, &global_index, ops); + } + } + return 0; +} + +int do_mptree(struct tree_data *td) +{ + struct maple_tree_ops ops = { + .entry = NULL, + .private = td, + .is_td = true, + }; + + int is_root = !(td->flags & TREE_NODE_POINTER); + + do_maple_tree_traverse(td->start, is_root, &ops); + + return 0; +} + +/***********************************************/ +void maple_init(void) +{ + int array_len; + + STRUCT_SIZE_INIT(maple_tree, "maple_tree"); + STRUCT_SIZE_INIT(maple_node, "maple_node"); + + MEMBER_OFFSET_INIT(maple_tree_ma_root, "maple_tree", "ma_root"); + MEMBER_OFFSET_INIT(maple_tree_ma_flags, "maple_tree", "ma_flags"); + + MEMBER_OFFSET_INIT(maple_node_parent, "maple_node", "parent"); + MEMBER_OFFSET_INIT(maple_node_ma64, "maple_node", "ma64"); + MEMBER_OFFSET_INIT(maple_node_mr64, "maple_node", "mr64"); + MEMBER_OFFSET_INIT(maple_node_slot, "maple_node", "slot"); + + MEMBER_OFFSET_INIT(maple_arange_64_pivot, "maple_arange_64", "pivot"); + MEMBER_OFFSET_INIT(maple_arange_64_slot, "maple_arange_64", "slot"); + MEMBER_OFFSET_INIT(maple_arange_64_gap, "maple_arange_64", "gap"); + MEMBER_OFFSET_INIT(maple_arange_64_meta, "maple_arange_64", "meta"); + + MEMBER_OFFSET_INIT(maple_range_64_pivot, "maple_range_64", "pivot"); + MEMBER_OFFSET_INIT(maple_range_64_slot, "maple_range_64", "slot"); + + MEMBER_OFFSET_INIT(maple_metadata_end, "maple_metadata", "end"); + MEMBER_OFFSET_INIT(maple_metadata_gap, "maple_metadata", "gap"); + + array_len = get_array_length("mt_slots", NULL, sizeof(char)); + mt_slots = calloc(array_len, sizeof(char)); + readmem(symbol_value("mt_slots"), KVADDR, mt_slots, + array_len * sizeof(char), "maple_init read mt_slots", + RETURN_ON_ERROR); + + array_len = get_array_length("mt_pivots", NULL, sizeof(char)); + mt_pivots = calloc(array_len, sizeof(char)); + readmem(symbol_value("mt_pivots"), KVADDR, mt_pivots, + array_len * sizeof(char), "maple_init read mt_pivots", + RETURN_ON_ERROR); + + mt_max[maple_dense] = mt_slots[maple_dense]; + mt_max[maple_leaf_64] = ULONG_MAX; + mt_max[maple_range_64] = ULONG_MAX; + mt_max[maple_arange_64] = ULONG_MAX; +} \ No newline at end of file diff --git a/maple_tree.h b/maple_tree.h new file mode 100644 index 0000000..369fa9f --- /dev/null +++ b/maple_tree.h @@ -0,0 +1,82 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +#ifndef _MAPLE_TREE_H +#define _MAPLE_TREE_H +/* + * Maple Tree - An RCU-safe adaptive tree for storing ranges + * Copyright (c) 2018-2022 Oracle + * Authors: Liam R. Howlett <Liam.Howlett(a)Oracle.com&gt; + * Matthew Wilcox <willy(a)infradead.org&gt; + * + * eXtensible Arrays + * Copyright (c) 2017 Microsoft Corporation + * Author: Matthew Wilcox <willy(a)infradead.org&gt; + * + * See Documentation/core-api/xarray.rst for how to use the XArray. + */ +#include <stdbool.h> +#include <limits.h> +#include <sys/types.h> + +/* + * The following are copied and modified from include/linux/maple_tree.h + */ + +enum maple_type { + maple_dense, + maple_leaf_64, + maple_range_64, + maple_arange_64, +}; + +#define MAPLE_NODE_MASK 255UL + +#define MT_FLAGS_HEIGHT_OFFSET 0x02 +#define MT_FLAGS_HEIGHT_MASK 0x7C + +#define MAPLE_NODE_TYPE_MASK 0x0F +#define MAPLE_NODE_TYPE_SHIFT 0x03 + +#define MAPLE_RESERVED_RANGE 4096 + +/* + * The following are copied and modified from include/linux/xarray.h + */ + +#define XA_ZERO_ENTRY xa_mk_internal(257) + +static inline ulong xa_mk_internal(ulong v) +{ + return (v << 2) | 2; +} + +static inline bool xa_is_internal(ulong entry) +{ + return (entry & 3) == 2; +} + +static inline bool xa_is_node(ulong entry) +{ + return xa_is_internal(entry) && entry > 4096; +} + +static inline bool xa_is_value(ulong entry) +{ + return entry & 1; +} + +static inline bool xa_is_zero(ulong entry) +{ + return entry == XA_ZERO_ENTRY; +} + +static inline unsigned long xa_to_internal(ulong entry) +{ + return entry >> 2; +} + +static inline unsigned long xa_to_value(ulong entry) +{ + return entry >> 1; +} + +#endif /* _MAPLE_TREE_H */ \ No newline at end of file -- 2.33.1

Hi Kazu, On Wed, Jan 11, 2023 at 10:15 AM HAGIO KAZUHITO(萩尾　一仁) <k-hagio-ab(a)nec.com&gt; wrote: Thanks for pointing it out. I agree with your modification. Thanks, Tao Liu

do_maple_tree() is similar to do_radix_tree() and do_xarray(), which takes the same do_maple_tree_traverse entry as tree cmd. Signed-off-by: Tao Liu <ltao(a)redhat.com&gt; --- defs.h | 6 +++ maple_tree.c | 145 +++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 151 insertions(+) diff --git a/defs.h b/defs.h index f98e189..33a823b 100644 --- a/defs.h +++ b/defs.h @@ -5762,6 +5762,12 @@ int cleanup_memory_driver(void); void maple_init(void); int do_mptree(struct tree_data *); +ulong do_maple_tree(ulong, int, struct list_pair *); +#define MAPLE_TREE_COUNT (1) +#define MAPLE_TREE_SEARCH (2) +#define MAPLE_TREE_DUMP (3) +#define MAPLE_TREE_GATHER (4) +#define MAPLE_TREE_DUMP_CB (5) /* * help.c diff --git a/maple_tree.c b/maple_tree.c index d9d1f6a..fa02ab6 100644 --- a/maple_tree.c +++ b/maple_tree.c @@ -40,6 +40,12 @@ static inline bool ma_is_leaf(const enum maple_type type) /***************For cmd_tree********************/ +struct do_maple_tree_info { + ulong maxcount; + ulong count; + void *data; +}; + struct maple_tree_ops { void (*entry)(ulong node, ulong slot, const char *path, ulong index, void *private); @@ -281,6 +287,9 @@ static void do_mt_entry(ulong entry, ulong min, ulong max, uint depth, static struct req_entry **e = NULL; struct tree_data *td = ops->is_td ? (struct tree_data *)ops->private : NULL; + if (ops->entry) + ops->entry(entry, entry, path, max, ops->private); + if (!td) return; @@ -422,6 +431,142 @@ int do_mptree(struct tree_data *td) return 0; } +/*************For do_maple_tree*****************/ +static void do_maple_tree_count(ulong node, ulong slot, const char *path, + ulong index, void *private) +{ + struct do_maple_tree_info *info = private; + info->count++; +} + +static void do_maple_tree_search(ulong node, ulong slot, const char *path, + ulong index, void *private) +{ + struct do_maple_tree_info *info = private; + struct list_pair *lp = info->data; + + if (lp->index == index) { + lp->value = (void *)slot; + info->count = 1; + } +} + +static void do_maple_tree_dump(ulong node, ulong slot, const char *path, + ulong index, void *private) +{ + struct do_maple_tree_info *info = private; + fprintf(fp, "[%lu] %lx\n", index, slot); + info->count++; +} + +static void do_maple_tree_gather(ulong node, ulong slot, const char *path, + ulong index, void *private) +{ + struct do_maple_tree_info *info = private; + struct list_pair *lp = info->data; + + if (info->maxcount) { + lp[info->count].index = index; + lp[info->count].value = (void *)slot; + + info->count++; + info->maxcount--; + } +} + +static void do_maple_tree_dump_cb(ulong node, ulong slot, const char *path, + ulong index, void *private) +{ + struct do_maple_tree_info *info = private; + struct list_pair *lp = info->data; + int (*cb)(ulong) = lp->value; + + /* Caller defined operation */ + if (!cb(slot)) { + error(FATAL, "do_maple_tree: callback " + "operation failed: entry: %ld item: %lx\n", + info->count, slot); + } + info->count++; +} + +/* + * do_maple_tree argument usage: + * + * root: Address of a maple_tree_root structure + * + * flag: MAPLE_TREE_COUNT - Return the number of entries in the tree. + * MAPLE_TREE_SEARCH - Search for an entry at lp->index; if found, + * store the entry in lp->value and return a count of 1; otherwise + * return a count of 0. + * MAPLE_TREE_DUMP - Dump all existing index/value pairs. + * MAPLE_TREE_GATHER - Store all existing index/value pairs in the + * passed-in array of list_pair structs starting at lp, + * returning the count of entries stored; the caller can/should + * limit the number of returned entries by putting the array size + * (max count) in the lp->index field of the first structure + * in the passed-in array. + * MAPLE_TREE_DUMP_CB - Similar with MAPLE_TREE_DUMP, but for each + * maple tree entry, a user defined callback at lp->value will + * be invoked. + * + * lp: Unused by MAPLE_TREE_COUNT and MAPLE_TREE_DUMP. + * A pointer to a list_pair structure for MAPLE_TREE_SEARCH. + * A pointer to an array of list_pair structures for + * MAPLE_TREE_GATHER; the dimension (max count) of the array may + * be stored in the index field of the first structure to avoid + * any chance of an overrun. + * For MAPLE_TREE_DUMP_CB, the lp->value must be initialized as a + * callback function. The callback prototype must be: int (*)(ulong); + */ +ulong +do_maple_tree(ulong root, int flag, struct list_pair *lp) +{ + struct do_maple_tree_info info = { + .count = 0, + .data = lp, + }; + struct maple_tree_ops ops = { + .private = &info, + .is_td = false, + }; + + switch (flag) + { + case MAPLE_TREE_COUNT: + ops.entry = do_maple_tree_count; + break; + + case MAPLE_TREE_SEARCH: + ops.entry = do_maple_tree_search; + break; + + case MAPLE_TREE_DUMP: + ops.entry = do_maple_tree_dump; + break; + + case MAPLE_TREE_GATHER: + if (!(info.maxcount = lp->index)) + info.maxcount = (ulong)(-1); /* caller beware */ + + ops.entry = do_maple_tree_gather; + break; + + case MAPLE_TREE_DUMP_CB: + if (lp->value == NULL) { + error(FATAL, "do_maple_tree: need set callback function"); + } + ops.entry = do_maple_tree_dump_cb; + break; + + default: + error(FATAL, "do_maple_tree: invalid flag: %lx\n", flag); + } + + do_maple_tree_traverse(root, true, &ops); + return info.count; +} + /***********************************************/ void maple_init(void) { -- 2.33.1

Signed-off-by: Tao Liu <ltao(a)redhat.com&gt; --- help.c | 86 +++++++++++++++++++++++++++++++++++++++++++--------------- 1 file changed, 64 insertions(+), 22 deletions(-) diff --git a/help.c b/help.c index 367500f..b23a65f 100644 --- a/help.c +++ b/help.c @@ -6307,19 +6307,20 @@ NULL char *help_tree[] = { "tree", -"display radix tree, XArray or red-black tree", -"[-t [radix|xarray|rbtree]] [-r offset] [-[s|S] struct[.member[,member]]]\n -[x|d] [-o offset] [-l] [-p] [-N] start", -" This command dumps the contents of a radix tree, an XAarray, or a red-black", -" tree. The arguments are as follows:\n", +"display radix tree, XArray, red-black tree or maple tree", +"[-t [radix|xarray|rbtree|maple]] [-r offset] [-[s|S] struct[.member[,member]]]\n" +" -[x|d] [-o offset] [-l] [-p] [-v] [-N] start", +" This command dumps the contents of a radix tree, an XAarray, a red-black", +" tree, or a maple tree. The arguments are as follows:\n", " -t type The type of tree to dump; the type string can be one of ", -" \"radix\", \"rbtree\", or \"xarray\", or alternatively, \"ra\",", -" \"rb\" or \"x\" are acceptable. If not specified, rbtree is the", -" default type.", +" \"radix\", \"rbtree\", \"xarray\", or \"maple\", or alternatively,", +" \"ra\", \"rb\", \"x\" or \"m\" are acceptable. If not specified,", +" rbtree is the default type.", " -r offset If the \"start\" argument is the address of a data structure that", -" contains an radix_tree_root, xarray or rb_root structure, then this", -" is the offset to that structure member. If the offset is non-zero,", -" then this option is required. The offset may be entered in either", -" of two manners:", +" contains an radix_tree_root, maple_tree, xarray or rb_root", +" structure, then this is the offset to that structure member. If", +" the offset is non-zero, then this option is required. The offset", +" may be entered in either of two manners:", " 1. In \"structure.member\" format.", " 2. A number of bytes.", " -o offset For red-black trees only, the offset of the rb_node within its ", @@ -6348,25 +6349,26 @@ char *help_tree[] = { " -p Display the node's position information, showing the relationship", " between it and the root. For red-black trees, a position that", " indicates \"root/l/r\" means that the node is the right child", -" of the left child of the root node. For radix trees and xarrays,", -" the index, the height, and the slot index values are shown with", -" respect to the root.", +" of the left child of the root node. For radix trees, xarrays and", +" maple trees, the index, the height, and the slot index values are", +" shown with respect to the root.", " -x Override default output format with hexadecimal format.", " -d Override default output format with decimal format.", +" -v For maple trees only, showing the contents of each maple tree node.", " ", " The meaning of the \"start\" argument, which can be expressed either in", " hexadecimal format or symbolically, depends upon whether the -N option", " is prepended:", " ", -" start The address of a radix_tree_root, xarray or rb_root structure, or", -" the address of a structure containing the radix_tree_root, xarray", -" or rb_root structure; if the latter, then the \"-r offset\" option", -" must be used if the member offset of the root structure is ", -" non-zero.", +" start The address of a radix_tree_root, maple_tree, xarray or rb_root", +" structure, or the address of a structure containing the", +" radix_tree_root, maple_tree, xarray or rb_root structure; if the", +" latter, then the \"-r offset\" option must be used if the member", +" offset of the root structure is non-zero.", " ", -" -N start The address of a radix_tree_node, xa_node or rb_node structure,", -" bypassing the radix_tree_root, xarray, or rb_root that points", -" to it.", +" -N start The address of a radix_tree_node, maple_node, xa_node or rb_node", +" structure, bypassing the radix_tree_root, maple_tree, xarray, or", +" rb_root that points to it.", "", "\nEXAMPLES", " The vmap_area_root is a standalone rb_root structure. Display the ", @@ -6703,6 +6705,46 @@ char *help_tree[] = { " _refcount = {", " counter = 0x1", " }", +"", +" The -v option is introduced specifically for dumping the complete content of", +" maple tree:", +"", +" %s> tree -t maple 0xffff9034c006aec0 -v", +"", +" maple_tree(ffff9034c006aec0) flags 309, height 2 root 0xffff9034de70041e", +"", +" 0-18446744073709551615: node 0xffff9034de700400 depth 0 type 3 parent ...", +" 0-140112331583487: node 0xffff9034c01e8800 depth 1 type 1 parent ...", +" 0-94643156942847: 0x0", +" 94643156942848-94643158024191: 0xffff9035131754c0", +" 94643158024192-94643160117247: 0x0", +" ...", +"", +" The old tree args can work as well for maple tree:", +"", +" %s> tree -t maple -r mm_struct.mm_mt 0xffff9034c006aec0 -p", +" ffff9035131754c0", +" index: 1 position: root/0/1", +" ffff9035131751c8", +" index: 2 position: root/0/3", +" ffff9035131757b8", +" index: 3 position: root/0/4", +" ...", +"", +" %s> tree -t maple 0xffff9034c006aec0 -p -x -s vm_area_struct.vm_start,vm_end", +" ffff9035131754c0", +" index: 1 position: root/0/1", +" vm_start = 0x5613d3c00000,", +" vm_end = 0x5613d3d08000,", +" ffff9035131751c8", +" index: 2 position: root/0/3", +" vm_start = 0x5613d3f07000,", +" vm_end = 0x5613d3f0b000,", +" ffff9035131757b8", +" index: 3 position: root/0/4", +" vm_start = 0x5613d3f0b000,", +" vm_end = 0x5613d3f14000,", +" ....", NULL }; -- 2.33.1

In the previous patches, a few variables are added to offset_table and size_table, we need to print it out with help cmd. Signed-off-by: Tao Liu <ltao(a)redhat.com&gt; --- symbols.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/symbols.c b/symbols.c index 33e68d5..e38df8a 100644 --- a/symbols.c +++ b/symbols.c @@ -10766,6 +10766,21 @@ dump_offset_table(char *spec, ulong makestruct) OFFSET(sbq_wait_state_wait_cnt)); fprintf(fp, " sbq_wait_state_wait: %ld\n", OFFSET(sbq_wait_state_wait)); + fprintf(fp, " mm_struct_mm_mt: %ld\n", OFFSET(mm_struct_mm_mt)); + fprintf(fp, " maple_tree_ma_root: %ld\n", OFFSET(maple_tree_ma_root)); + fprintf(fp, " maple_tree_ma_flags: %ld\n", OFFSET(maple_tree_ma_flags)); + fprintf(fp, " maple_node_parent: %ld\n", OFFSET(maple_node_parent)); + fprintf(fp, " maple_node_ma64: %ld\n", OFFSET(maple_node_ma64)); + fprintf(fp, " maple_node_mr64: %ld\n", OFFSET(maple_node_mr64)); + fprintf(fp, " maple_node_slot: %ld\n", OFFSET(maple_node_slot)); + fprintf(fp, " maple_arange_64_pivot: %ld\n", OFFSET(maple_arange_64_pivot)); + fprintf(fp, " maple_arange_64_slot: %ld\n", OFFSET(maple_arange_64_slot)); + fprintf(fp, " maple_arange_64_gap: %ld\n", OFFSET(maple_arange_64_gap)); + fprintf(fp, " maple_arange_64_meta: %ld\n", OFFSET(maple_arange_64_meta)); + fprintf(fp, " maple_range_64_pivot: %ld\n", OFFSET(maple_range_64_pivot)); + fprintf(fp, " maple_range_64_slot: %ld\n", OFFSET(maple_range_64_slot)); + fprintf(fp, " maple_metadata_end: %ld\n", OFFSET(maple_metadata_end)); + fprintf(fp, " maple_metadata_gap: %ld\n", OFFSET(maple_metadata_gap)); fprintf(fp, "\n size_table:\n"); fprintf(fp, " page: %ld\n", SIZE(page)); @@ -11038,6 +11053,8 @@ dump_offset_table(char *spec, ulong makestruct) fprintf(fp, " sbitmap_queue: %ld\n", SIZE(sbitmap_queue)); fprintf(fp, " sbq_wait_state: %ld\n", SIZE(sbq_wait_state)); fprintf(fp, " blk_mq_tags: %ld\n", SIZE(blk_mq_tags)); + fprintf(fp, " maple_tree: %ld\n", SIZE(maple_tree)); + fprintf(fp, " maple_node: %ld\n", SIZE(maple_node)); fprintf(fp, " percpu_counter: %ld\n", SIZE(percpu_counter)); -- 2.33.1