Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * mm/debug.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * mm/ specific debug routines.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/trace_events.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/memcontrol.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <trace/events/mmflags.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/migrate.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/page_owner.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/page_pinner.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/ctype.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include "internal.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) const char *migrate_reason_names[MR_TYPES] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 	"compaction",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 	"memory_failure",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 	"memory_hotplug",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 	"syscall_or_cpuset",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 	"mempolicy_mbind",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 	"numa_misplaced",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 	"cma",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) const struct trace_print_flags pageflag_names[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	__def_pageflag_names,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	{0, NULL}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) const struct trace_print_flags gfpflag_names[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	__def_gfpflag_names,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	{0, NULL}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) const struct trace_print_flags vmaflag_names[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	__def_vmaflag_names,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	{0, NULL}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) void __dump_page(struct page *page, const char *reason)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	struct page *head = compound_head(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	struct address_space *mapping;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	bool page_poisoned = PagePoisoned(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	bool compound = PageCompound(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	 * Accessing the pageblock without the zone lock. It could change to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	 * "isolate" again in the meantime, but since we are just dumping the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	 * state for debugging, it should be fine to accept a bit of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	 * inaccuracy here due to racing.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	bool page_cma = is_migrate_cma_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	int mapcount;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	char *type = "";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	 * If struct page is poisoned don't access Page*() functions as that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	 * leads to recursive loop. Page*() check for poisoned pages, and calls
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	 * dump_page() when detected.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	if (page_poisoned) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 		pr_warn("page:%px is uninitialized and poisoned", page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 		goto hex_only;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	if (page < head || (page >= head + MAX_ORDER_NR_PAGES)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 		 * Corrupt page, so we cannot call page_mapping. Instead, do a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 		 * safe subset of the steps that page_mapping() does. Caution:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 		 * this will be misleading for tail pages, PageSwapCache pages,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 		 * and potentially other situations. (See the page_mapping()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 		 * implementation for what's missing here.)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 		unsigned long tmp = (unsigned long)page->mapping;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 		if (tmp & PAGE_MAPPING_ANON)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 			mapping = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 			mapping = (void *)(tmp & ~PAGE_MAPPING_FLAGS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 		head = page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 		compound = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 		mapping = page_mapping(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	 * Avoid VM_BUG_ON() in page_mapcount().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	 * page->_mapcount space in struct page is used by sl[aou]b pages to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	 * encode own info.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	mapcount = PageSlab(head) ? 0 : page_mapcount(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	pr_warn("page:%p refcount:%d mapcount:%d mapping:%p index:%#lx pfn:%#lx\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 			page, page_ref_count(head), mapcount, mapping,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 			page_to_pgoff(page), page_to_pfn(page));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	if (compound) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 		if (hpage_pincount_available(page)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 			pr_warn("head:%p order:%u compound_mapcount:%d compound_pincount:%d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 					head, compound_order(head),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 					head_compound_mapcount(head),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 					head_compound_pincount(head));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 			pr_warn("head:%p order:%u compound_mapcount:%d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 					head, compound_order(head),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 					head_compound_mapcount(head));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	if (PageKsm(page))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 		type = "ksm ";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	else if (PageAnon(page))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 		type = "anon ";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	else if (mapping) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 		struct inode *host;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 		const struct address_space_operations *a_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 		struct hlist_node *dentry_first;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 		struct dentry *dentry_ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 		struct dentry dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 		unsigned long ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 		 * mapping can be invalid pointer and we don't want to crash
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 		 * accessing it, so probe everything depending on it carefully
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 		if (get_kernel_nofault(host, &mapping->host) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 		    get_kernel_nofault(a_ops, &mapping->a_ops)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 			pr_warn("failed to read mapping contents, not a valid kernel address?\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 			goto out_mapping;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 		if (!host) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 			pr_warn("aops:%ps\n", a_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 			goto out_mapping;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 		if (get_kernel_nofault(dentry_first, &host->i_dentry.first) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 		    get_kernel_nofault(ino, &host->i_ino)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 			pr_warn("aops:%ps with invalid host inode %px\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 					a_ops, host);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 			goto out_mapping;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 		if (!dentry_first) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 			pr_warn("aops:%ps ino:%lx\n", a_ops, ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 			goto out_mapping;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 		dentry_ptr = container_of(dentry_first, struct dentry, d_u.d_alias);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 		if (get_kernel_nofault(dentry, dentry_ptr)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 			pr_warn("aops:%ps ino:%lx with invalid dentry %px\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 					a_ops, ino, dentry_ptr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 			/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 			 * if dentry is corrupted, the %pd handler may still
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 			 * crash, but it's unlikely that we reach here with a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 			 * corrupted struct page
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 			 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 			pr_warn("aops:%ps ino:%lx dentry name:\"%pd\"\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 					a_ops, ino, &dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) out_mapping:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	BUILD_BUG_ON(ARRAY_SIZE(pageflag_names) != __NR_PAGEFLAGS + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	pr_warn("%sflags: %#lx(%pGp)%s\n", type, head->flags, &head->flags,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 		page_cma ? " CMA" : "");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) hex_only:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	print_hex_dump(KERN_WARNING, "raw: ", DUMP_PREFIX_NONE, 32,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 			sizeof(unsigned long), page,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 			sizeof(struct page), false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	if (head != page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 		print_hex_dump(KERN_WARNING, "head: ", DUMP_PREFIX_NONE, 32,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 			sizeof(unsigned long), head,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 			sizeof(struct page), false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	if (reason)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 		pr_warn("page dumped because: %s\n", reason);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) #ifdef CONFIG_MEMCG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	if (!page_poisoned && page->mem_cgroup)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 		pr_warn("page->mem_cgroup:%px\n", page->mem_cgroup);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) void dump_page(struct page *page, const char *reason)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	__dump_page(page, reason);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	dump_page_owner(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	dump_page_pinner(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) EXPORT_SYMBOL(dump_page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) #ifdef CONFIG_DEBUG_VM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) void dump_vma(const struct vm_area_struct *vma)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	pr_emerg("vma %px start %px end %px\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 		"next %px prev %px mm %px\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 		"prot %lx anon_vma %px vm_ops %px\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 		"pgoff %lx file %px private_data %px\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 		"flags: %#lx(%pGv)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 		vma, (void *)vma->vm_start, (void *)vma->vm_end, vma->vm_next,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 		vma->vm_prev, vma->vm_mm,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 		(unsigned long)pgprot_val(vma->vm_page_prot),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 		vma->anon_vma, vma->vm_ops, vma->vm_pgoff,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 		vma->vm_file, vma->vm_private_data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 		vma->vm_flags, &vma->vm_flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) EXPORT_SYMBOL(dump_vma);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) void dump_mm(const struct mm_struct *mm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	pr_emerg("mm %px mmap %px seqnum %llu task_size %lu\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) #ifdef CONFIG_MMU
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 		"get_unmapped_area %px\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 		"mmap_base %lu mmap_legacy_base %lu highest_vm_end %lu\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 		"pgd %px mm_users %d mm_count %d pgtables_bytes %lu map_count %d\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 		"hiwater_rss %lx hiwater_vm %lx total_vm %lx locked_vm %lx\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 		"pinned_vm %llx data_vm %lx exec_vm %lx stack_vm %lx\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 		"start_code %lx end_code %lx start_data %lx end_data %lx\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 		"start_brk %lx brk %lx start_stack %lx\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 		"arg_start %lx arg_end %lx env_start %lx env_end %lx\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 		"binfmt %px flags %lx core_state %px\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) #ifdef CONFIG_AIO
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 		"ioctx_table %px\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) #ifdef CONFIG_MEMCG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 		"owner %px "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 		"exe_file %px\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) #ifdef CONFIG_MMU_NOTIFIER
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 		"notifier_subscriptions %px\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) #ifdef CONFIG_NUMA_BALANCING
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 		"numa_next_scan %lu numa_scan_offset %lu numa_scan_seq %d\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 		"tlb_flush_pending %d\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 		"def_flags: %#lx(%pGv)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 		mm, mm->mmap, (long long) mm->vmacache_seqnum, mm->task_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) #ifdef CONFIG_MMU
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 		mm->get_unmapped_area,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 		mm->mmap_base, mm->mmap_legacy_base, mm->highest_vm_end,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 		mm->pgd, atomic_read(&mm->mm_users),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 		atomic_read(&mm->mm_count),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 		mm_pgtables_bytes(mm),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 		mm->map_count,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 		mm->hiwater_rss, mm->hiwater_vm, mm->total_vm, mm->locked_vm,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 		(u64)atomic64_read(&mm->pinned_vm),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 		mm->data_vm, mm->exec_vm, mm->stack_vm,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 		mm->start_code, mm->end_code, mm->start_data, mm->end_data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 		mm->start_brk, mm->brk, mm->start_stack,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 		mm->arg_start, mm->arg_end, mm->env_start, mm->env_end,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 		mm->binfmt, mm->flags, mm->core_state,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) #ifdef CONFIG_AIO
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 		mm->ioctx_table,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) #ifdef CONFIG_MEMCG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 		mm->owner,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 		mm->exe_file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) #ifdef CONFIG_MMU_NOTIFIER
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 		mm->notifier_subscriptions,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) #ifdef CONFIG_NUMA_BALANCING
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 		mm->numa_next_scan, mm->numa_scan_offset, mm->numa_scan_seq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 		atomic_read(&mm->tlb_flush_pending),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 		mm->def_flags, &mm->def_flags
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) static bool page_init_poisoning __read_mostly = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) static int __init setup_vm_debug(char *str)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	bool __page_init_poisoning = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 	 * Calling vm_debug with no arguments is equivalent to requesting
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 	 * to enable all debugging options we can control.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	if (*str++ != '=' || !*str)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 	__page_init_poisoning = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	if (*str == '-')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	while (*str) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 		switch (tolower(*str)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 		case'p':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 			__page_init_poisoning = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 		default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 			pr_err("vm_debug option '%c' unknown. skipped\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 			       *str);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 		str++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 	if (page_init_poisoning && !__page_init_poisoning)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 		pr_warn("Page struct poisoning disabled by kernel command line option 'vm_debug'\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 	page_init_poisoning = __page_init_poisoning;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 	return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) __setup("vm_debug", setup_vm_debug);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) void page_init_poison(struct page *page, size_t size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 	if (page_init_poisoning)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 		memset(page, PAGE_POISON_PATTERN, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) EXPORT_SYMBOL_GPL(page_init_poison);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) #endif		/* CONFIG_DEBUG_VM */