b24413180f560 (Greg Kroah-Hartman 2017-11-01 15:07:57 +0100 1) // SPDX-License-Identifier: GPL-2.0
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 2) /*
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 3) * High memory handling common code and variables.
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 4) *
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 5) * (C) 1999 Andrea Arcangeli, SuSE GmbH, andrea@suse.de
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 6) * Gerhard Wichert, Siemens AG, Gerhard.Wichert@pdb.siemens.de
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 7) *
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 8) *
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 9) * Redesigned the x86 32-bit VM architecture to deal with
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 10) * 64-bit physical space. With current x86 CPUs this
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 11) * means up to 64 Gigabytes physical RAM.
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 12) *
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 13) * Rewrote high memory support to move the page cache into
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 14) * high memory. Implemented permanent (schedulable) kmaps
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 15) * based on Linus' idea.
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 16) *
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 17) * Copyright (C) 1999 Ingo Molnar <mingo@redhat.com>
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 18) */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 19)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 20) #include <linux/mm.h>
b95f1b31b7558 (Paul Gortmaker 2011-10-16 02:01:52 -0400 21) #include <linux/export.h>
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 22) #include <linux/swap.h>
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 23) #include <linux/bio.h>
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 24) #include <linux/pagemap.h>
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 25) #include <linux/mempool.h>
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 26) #include <linux/blkdev.h>
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 27) #include <linux/init.h>
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 28) #include <linux/hash.h>
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 29) #include <linux/highmem.h>
eac790059b228 (Jason Wessel 2010-08-05 09:22:24 -0500 30) #include <linux/kgdb.h>
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 31) #include <asm/tlbflush.h>
186525bd6b83e (Ingo Molnar 2019-11-29 08:17:25 +0100 32) #include <linux/vmalloc.h>
a8e23a291852c (Peter Zijlstra 2010-10-27 15:32:57 -0700 33)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 34) /*
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 35) * Virtual_count is not a pure "count".
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 36) * 0 means that it is not mapped, and has not been mapped
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 37) * since a TLB flush - it is usable.
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 38) * 1 means that there are no users, but it has been mapped
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 39) * since the last TLB flush - so we can't use it.
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 40) * n means that there are (n-1) current users of it.
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 41) */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 42) #ifdef CONFIG_HIGHMEM
260b23674fdb5 (Al Viro 2005-10-21 03:22:44 -0400 43)
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 44) /*
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 45) * Architecture with aliasing data cache may define the following family of
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 46) * helper functions in its asm/highmem.h to control cache color of virtual
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 47) * addresses where physical memory pages are mapped by kmap.
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 48) */
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 49) #ifndef get_pkmap_color
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 50)
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 51) /*
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 52) * Determine color of virtual address where the page should be mapped.
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 53) */
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 54) static inline unsigned int get_pkmap_color(struct page *page)
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 55) {
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 56) return 0;
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 57) }
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 58) #define get_pkmap_color get_pkmap_color
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 59)
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 60) /*
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 61) * Get next index for mapping inside PKMAP region for page with given color.
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 62) */
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 63) static inline unsigned int get_next_pkmap_nr(unsigned int color)
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 64) {
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 65) static unsigned int last_pkmap_nr;
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 66)
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 67) last_pkmap_nr = (last_pkmap_nr + 1) & LAST_PKMAP_MASK;
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 68) return last_pkmap_nr;
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 69) }
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 70)
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 71) /*
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 72) * Determine if page index inside PKMAP region (pkmap_nr) of given color
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 73) * has wrapped around PKMAP region end. When this happens an attempt to
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 74) * flush all unused PKMAP slots is made.
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 75) */
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 76) static inline int no_more_pkmaps(unsigned int pkmap_nr, unsigned int color)
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 77) {
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 78) return pkmap_nr == 0;
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 79) }
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 80)
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 81) /*
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 82) * Get the number of PKMAP entries of the given color. If no free slot is
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 83) * found after checking that many entries, kmap will sleep waiting for
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 84) * someone to call kunmap and free PKMAP slot.
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 85) */
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 86) static inline int get_pkmap_entries_count(unsigned int color)
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 87) {
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 88) return LAST_PKMAP;
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 89) }
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 90)
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 91) /*
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 92) * Get head of a wait queue for PKMAP entries of the given color.
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 93) * Wait queues for different mapping colors should be independent to avoid
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 94) * unnecessary wakeups caused by freeing of slots of other colors.
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 95) */
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 96) static inline wait_queue_head_t *get_pkmap_wait_queue_head(unsigned int color)
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 97) {
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 98) static DECLARE_WAIT_QUEUE_HEAD(pkmap_map_wait);
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 99)
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 100) return &pkmap_map_wait;
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 101) }
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 102) #endif
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 103)
ca79b0c211af6 (Arun KS 2018-12-28 00:34:29 -0800 104) atomic_long_t _totalhigh_pages __read_mostly;
ca79b0c211af6 (Arun KS 2018-12-28 00:34:29 -0800 105) EXPORT_SYMBOL(_totalhigh_pages);
3e4d3af501ccc (Peter Zijlstra 2010-10-26 14:21:51 -0700 106)
9727688dbf7ea (songqiang 2021-05-04 18:40:09 -0700 107) unsigned int __nr_free_highpages(void)
c1f60a5a419cc (Christoph Lameter 2006-09-25 23:31:11 -0700 108) {
33499bfe507c8 (Joonsoo Kim 2016-05-19 17:12:26 -0700 109) struct zone *zone;
c1f60a5a419cc (Christoph Lameter 2006-09-25 23:31:11 -0700 110) unsigned int pages = 0;
c1f60a5a419cc (Christoph Lameter 2006-09-25 23:31:11 -0700 111)
33499bfe507c8 (Joonsoo Kim 2016-05-19 17:12:26 -0700 112) for_each_populated_zone(zone) {
33499bfe507c8 (Joonsoo Kim 2016-05-19 17:12:26 -0700 113) if (is_highmem(zone))
33499bfe507c8 (Joonsoo Kim 2016-05-19 17:12:26 -0700 114) pages += zone_page_state(zone, NR_FREE_PAGES);
2a1e274acf0b1 (Mel Gorman 2007-07-17 04:03:12 -0700 115) }
c1f60a5a419cc (Christoph Lameter 2006-09-25 23:31:11 -0700 116)
c1f60a5a419cc (Christoph Lameter 2006-09-25 23:31:11 -0700 117) return pages;
c1f60a5a419cc (Christoph Lameter 2006-09-25 23:31:11 -0700 118) }
c1f60a5a419cc (Christoph Lameter 2006-09-25 23:31:11 -0700 119)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 120) static int pkmap_count[LAST_PKMAP];
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 121) static __cacheline_aligned_in_smp DEFINE_SPINLOCK(kmap_lock);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 122)
9727688dbf7ea (songqiang 2021-05-04 18:40:09 -0700 123) pte_t *pkmap_page_table;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 124)
3297e760776af (Nicolas Pitre 2009-03-04 22:49:41 -0500 125) /*
3297e760776af (Nicolas Pitre 2009-03-04 22:49:41 -0500 126) * Most architectures have no use for kmap_high_get(), so let's abstract
3297e760776af (Nicolas Pitre 2009-03-04 22:49:41 -0500 127) * the disabling of IRQ out of the locking in that case to save on a
3297e760776af (Nicolas Pitre 2009-03-04 22:49:41 -0500 128) * potential useless overhead.
3297e760776af (Nicolas Pitre 2009-03-04 22:49:41 -0500 129) */
3297e760776af (Nicolas Pitre 2009-03-04 22:49:41 -0500 130) #ifdef ARCH_NEEDS_KMAP_HIGH_GET
3297e760776af (Nicolas Pitre 2009-03-04 22:49:41 -0500 131) #define lock_kmap() spin_lock_irq(&kmap_lock)
3297e760776af (Nicolas Pitre 2009-03-04 22:49:41 -0500 132) #define unlock_kmap() spin_unlock_irq(&kmap_lock)
3297e760776af (Nicolas Pitre 2009-03-04 22:49:41 -0500 133) #define lock_kmap_any(flags) spin_lock_irqsave(&kmap_lock, flags)
3297e760776af (Nicolas Pitre 2009-03-04 22:49:41 -0500 134) #define unlock_kmap_any(flags) spin_unlock_irqrestore(&kmap_lock, flags)
3297e760776af (Nicolas Pitre 2009-03-04 22:49:41 -0500 135) #else
3297e760776af (Nicolas Pitre 2009-03-04 22:49:41 -0500 136) #define lock_kmap() spin_lock(&kmap_lock)
3297e760776af (Nicolas Pitre 2009-03-04 22:49:41 -0500 137) #define unlock_kmap() spin_unlock(&kmap_lock)
3297e760776af (Nicolas Pitre 2009-03-04 22:49:41 -0500 138) #define lock_kmap_any(flags) \
3297e760776af (Nicolas Pitre 2009-03-04 22:49:41 -0500 139) do { spin_lock(&kmap_lock); (void)(flags); } while (0)
3297e760776af (Nicolas Pitre 2009-03-04 22:49:41 -0500 140) #define unlock_kmap_any(flags) \
3297e760776af (Nicolas Pitre 2009-03-04 22:49:41 -0500 141) do { spin_unlock(&kmap_lock); (void)(flags); } while (0)
3297e760776af (Nicolas Pitre 2009-03-04 22:49:41 -0500 142) #endif
3297e760776af (Nicolas Pitre 2009-03-04 22:49:41 -0500 143)
13f876ba77ebd (Thomas Gleixner 2020-11-03 10:27:34 +0100 144) struct page *__kmap_to_page(void *vaddr)
5a178119b0fbe (Mel Gorman 2012-07-31 16:45:02 -0700 145) {
5a178119b0fbe (Mel Gorman 2012-07-31 16:45:02 -0700 146) unsigned long addr = (unsigned long)vaddr;
5a178119b0fbe (Mel Gorman 2012-07-31 16:45:02 -0700 147)
498c228021232 (Will Deacon 2012-11-16 14:15:00 -0800 148) if (addr >= PKMAP_ADDR(0) && addr < PKMAP_ADDR(LAST_PKMAP)) {
4de22c0584fb0 (Joonsoo Kim 2012-12-11 16:01:17 -0800 149) int i = PKMAP_NR(addr);
9727688dbf7ea (songqiang 2021-05-04 18:40:09 -0700 150)
5a178119b0fbe (Mel Gorman 2012-07-31 16:45:02 -0700 151) return pte_page(pkmap_page_table[i]);
5a178119b0fbe (Mel Gorman 2012-07-31 16:45:02 -0700 152) }
5a178119b0fbe (Mel Gorman 2012-07-31 16:45:02 -0700 153)
5a178119b0fbe (Mel Gorman 2012-07-31 16:45:02 -0700 154) return virt_to_page(addr);
5a178119b0fbe (Mel Gorman 2012-07-31 16:45:02 -0700 155) }
13f876ba77ebd (Thomas Gleixner 2020-11-03 10:27:34 +0100 156) EXPORT_SYMBOL(__kmap_to_page);
5a178119b0fbe (Mel Gorman 2012-07-31 16:45:02 -0700 157)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 158) static void flush_all_zero_pkmaps(void)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 159) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 160) int i;
5843d9a4d0ba8 (Nicholas Piggin 2008-08-01 03:15:21 +0200 161) int need_flush = 0;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 162)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 163) flush_cache_kmaps();
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 164)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 165) for (i = 0; i < LAST_PKMAP; i++) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 166) struct page *page;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 167)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 168) /*
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 169) * zero means we don't have anything to do,
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 170) * >1 means that it is still in use. Only
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 171) * a count of 1 means that it is free but
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 172) * needs to be unmapped
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 173) */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 174) if (pkmap_count[i] != 1)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 175) continue;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 176) pkmap_count[i] = 0;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 177)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 178) /* sanity check */
75babcacede87 (Eric Sesterhenn 2006-04-02 13:47:35 +0200 179) BUG_ON(pte_none(pkmap_page_table[i]));
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 180)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 181) /*
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 182) * Don't need an atomic fetch-and-clear op here;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 183) * no-one has the page mapped, and cannot get at
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 184) * its virtual address (and hence PTE) without first
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 185) * getting the kmap_lock (which is held here).
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 186) * So no dangers, even with speculative execution.
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 187) */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 188) page = pte_page(pkmap_page_table[i]);
eb2db439a3203 (Joonsoo Kim 2012-12-11 16:01:24 -0800 189) pte_clear(&init_mm, PKMAP_ADDR(i), &pkmap_page_table[i]);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 190)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 191) set_page_address(page, NULL);
5843d9a4d0ba8 (Nicholas Piggin 2008-08-01 03:15:21 +0200 192) need_flush = 1;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 193) }
5843d9a4d0ba8 (Nicholas Piggin 2008-08-01 03:15:21 +0200 194) if (need_flush)
5843d9a4d0ba8 (Nicholas Piggin 2008-08-01 03:15:21 +0200 195) flush_tlb_kernel_range(PKMAP_ADDR(0), PKMAP_ADDR(LAST_PKMAP));
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 196) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 197)
13f876ba77ebd (Thomas Gleixner 2020-11-03 10:27:34 +0100 198) void __kmap_flush_unused(void)
ce6234b529890 (Jeremy Fitzhardinge 2007-05-02 19:27:15 +0200 199) {
3297e760776af (Nicolas Pitre 2009-03-04 22:49:41 -0500 200) lock_kmap();
ce6234b529890 (Jeremy Fitzhardinge 2007-05-02 19:27:15 +0200 201) flush_all_zero_pkmaps();
3297e760776af (Nicolas Pitre 2009-03-04 22:49:41 -0500 202) unlock_kmap();
ce6234b529890 (Jeremy Fitzhardinge 2007-05-02 19:27:15 +0200 203) }
ce6234b529890 (Jeremy Fitzhardinge 2007-05-02 19:27:15 +0200 204)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 205) static inline unsigned long map_new_virtual(struct page *page)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 206) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 207) unsigned long vaddr;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 208) int count;
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 209) unsigned int last_pkmap_nr;
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 210) unsigned int color = get_pkmap_color(page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 211)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 212) start:
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 213) count = get_pkmap_entries_count(color);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 214) /* Find an empty entry */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 215) for (;;) {
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 216) last_pkmap_nr = get_next_pkmap_nr(color);
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 217) if (no_more_pkmaps(last_pkmap_nr, color)) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 218) flush_all_zero_pkmaps();
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 219) count = get_pkmap_entries_count(color);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 220) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 221) if (!pkmap_count[last_pkmap_nr])
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 222) break; /* Found a usable entry */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 223) if (--count)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 224) continue;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 225)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 226) /*
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 227) * Sleep for somebody else to unmap their entries
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 228) */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 229) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 230) DECLARE_WAITQUEUE(wait, current);
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 231) wait_queue_head_t *pkmap_map_wait =
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 232) get_pkmap_wait_queue_head(color);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 233)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 234) __set_current_state(TASK_UNINTERRUPTIBLE);
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 235) add_wait_queue(pkmap_map_wait, &wait);
3297e760776af (Nicolas Pitre 2009-03-04 22:49:41 -0500 236) unlock_kmap();
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 237) schedule();
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 238) remove_wait_queue(pkmap_map_wait, &wait);
3297e760776af (Nicolas Pitre 2009-03-04 22:49:41 -0500 239) lock_kmap();
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 240)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 241) /* Somebody else might have mapped it while we slept */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 242) if (page_address(page))
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 243) return (unsigned long)page_address(page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 244)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 245) /* Re-start */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 246) goto start;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 247) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 248) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 249) vaddr = PKMAP_ADDR(last_pkmap_nr);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 250) set_pte_at(&init_mm, vaddr,
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 251) &(pkmap_page_table[last_pkmap_nr]), mk_pte(page, kmap_prot));
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 252)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 253) pkmap_count[last_pkmap_nr] = 1;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 254) set_page_address(page, (void *)vaddr);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 255)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 256) return vaddr;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 257) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 258)
77f6078aa8945 (Randy Dunlap 2008-03-19 17:00:42 -0700 259) /**
77f6078aa8945 (Randy Dunlap 2008-03-19 17:00:42 -0700 260) * kmap_high - map a highmem page into memory
77f6078aa8945 (Randy Dunlap 2008-03-19 17:00:42 -0700 261) * @page: &struct page to map
77f6078aa8945 (Randy Dunlap 2008-03-19 17:00:42 -0700 262) *
77f6078aa8945 (Randy Dunlap 2008-03-19 17:00:42 -0700 263) * Returns the page's virtual memory address.
77f6078aa8945 (Randy Dunlap 2008-03-19 17:00:42 -0700 264) *
77f6078aa8945 (Randy Dunlap 2008-03-19 17:00:42 -0700 265) * We cannot call this from interrupts, as it may block.
77f6078aa8945 (Randy Dunlap 2008-03-19 17:00:42 -0700 266) */
920c7a5d0c94b (Harvey Harrison 2008-02-04 22:29:26 -0800 267) void *kmap_high(struct page *page)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 268) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 269) unsigned long vaddr;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 270)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 271) /*
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 272) * For highmem pages, we can't trust "virtual" until
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 273) * after we have the lock.
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 274) */
3297e760776af (Nicolas Pitre 2009-03-04 22:49:41 -0500 275) lock_kmap();
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 276) vaddr = (unsigned long)page_address(page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 277) if (!vaddr)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 278) vaddr = map_new_virtual(page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 279) pkmap_count[PKMAP_NR(vaddr)]++;
75babcacede87 (Eric Sesterhenn 2006-04-02 13:47:35 +0200 280) BUG_ON(pkmap_count[PKMAP_NR(vaddr)] < 2);
3297e760776af (Nicolas Pitre 2009-03-04 22:49:41 -0500 281) unlock_kmap();
9727688dbf7ea (songqiang 2021-05-04 18:40:09 -0700 282) return (void *) vaddr;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 283) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 284) EXPORT_SYMBOL(kmap_high);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 285)
3297e760776af (Nicolas Pitre 2009-03-04 22:49:41 -0500 286) #ifdef ARCH_NEEDS_KMAP_HIGH_GET
3297e760776af (Nicolas Pitre 2009-03-04 22:49:41 -0500 287) /**
3297e760776af (Nicolas Pitre 2009-03-04 22:49:41 -0500 288) * kmap_high_get - pin a highmem page into memory
3297e760776af (Nicolas Pitre 2009-03-04 22:49:41 -0500 289) * @page: &struct page to pin
3297e760776af (Nicolas Pitre 2009-03-04 22:49:41 -0500 290) *
3297e760776af (Nicolas Pitre 2009-03-04 22:49:41 -0500 291) * Returns the page's current virtual memory address, or NULL if no mapping
5e39df5625fb9 (Uwe Kleine-König 2010-01-25 21:38:09 +0100 292) * exists. If and only if a non null address is returned then a
3297e760776af (Nicolas Pitre 2009-03-04 22:49:41 -0500 293) * matching call to kunmap_high() is necessary.
3297e760776af (Nicolas Pitre 2009-03-04 22:49:41 -0500 294) *
3297e760776af (Nicolas Pitre 2009-03-04 22:49:41 -0500 295) * This can be called from any context.
3297e760776af (Nicolas Pitre 2009-03-04 22:49:41 -0500 296) */
3297e760776af (Nicolas Pitre 2009-03-04 22:49:41 -0500 297) void *kmap_high_get(struct page *page)
3297e760776af (Nicolas Pitre 2009-03-04 22:49:41 -0500 298) {
3297e760776af (Nicolas Pitre 2009-03-04 22:49:41 -0500 299) unsigned long vaddr, flags;
3297e760776af (Nicolas Pitre 2009-03-04 22:49:41 -0500 300)
3297e760776af (Nicolas Pitre 2009-03-04 22:49:41 -0500 301) lock_kmap_any(flags);
3297e760776af (Nicolas Pitre 2009-03-04 22:49:41 -0500 302) vaddr = (unsigned long)page_address(page);
3297e760776af (Nicolas Pitre 2009-03-04 22:49:41 -0500 303) if (vaddr) {
3297e760776af (Nicolas Pitre 2009-03-04 22:49:41 -0500 304) BUG_ON(pkmap_count[PKMAP_NR(vaddr)] < 1);
3297e760776af (Nicolas Pitre 2009-03-04 22:49:41 -0500 305) pkmap_count[PKMAP_NR(vaddr)]++;
3297e760776af (Nicolas Pitre 2009-03-04 22:49:41 -0500 306) }
3297e760776af (Nicolas Pitre 2009-03-04 22:49:41 -0500 307) unlock_kmap_any(flags);
9727688dbf7ea (songqiang 2021-05-04 18:40:09 -0700 308) return (void *) vaddr;
3297e760776af (Nicolas Pitre 2009-03-04 22:49:41 -0500 309) }
3297e760776af (Nicolas Pitre 2009-03-04 22:49:41 -0500 310) #endif
3297e760776af (Nicolas Pitre 2009-03-04 22:49:41 -0500 311)
77f6078aa8945 (Randy Dunlap 2008-03-19 17:00:42 -0700 312) /**
4e9dc5df46001 (Li Haifeng 2011-10-31 17:09:09 -0700 313) * kunmap_high - unmap a highmem page into memory
77f6078aa8945 (Randy Dunlap 2008-03-19 17:00:42 -0700 314) * @page: &struct page to unmap
3297e760776af (Nicolas Pitre 2009-03-04 22:49:41 -0500 315) *
3297e760776af (Nicolas Pitre 2009-03-04 22:49:41 -0500 316) * If ARCH_NEEDS_KMAP_HIGH_GET is not defined then this may be called
3297e760776af (Nicolas Pitre 2009-03-04 22:49:41 -0500 317) * only from user context.
77f6078aa8945 (Randy Dunlap 2008-03-19 17:00:42 -0700 318) */
920c7a5d0c94b (Harvey Harrison 2008-02-04 22:29:26 -0800 319) void kunmap_high(struct page *page)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 320) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 321) unsigned long vaddr;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 322) unsigned long nr;
3297e760776af (Nicolas Pitre 2009-03-04 22:49:41 -0500 323) unsigned long flags;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 324) int need_wakeup;
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 325) unsigned int color = get_pkmap_color(page);
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 326) wait_queue_head_t *pkmap_map_wait;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 327)
3297e760776af (Nicolas Pitre 2009-03-04 22:49:41 -0500 328) lock_kmap_any(flags);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 329) vaddr = (unsigned long)page_address(page);
75babcacede87 (Eric Sesterhenn 2006-04-02 13:47:35 +0200 330) BUG_ON(!vaddr);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 331) nr = PKMAP_NR(vaddr);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 332)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 333) /*
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 334) * A count must never go down to zero
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 335) * without a TLB flush!
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 336) */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 337) need_wakeup = 0;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 338) switch (--pkmap_count[nr]) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 339) case 0:
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 340) BUG();
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 341) case 1:
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 342) /*
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 343) * Avoid an unnecessary wake_up() function call.
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 344) * The common case is pkmap_count[] == 1, but
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 345) * no waiters.
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 346) * The tasks queued in the wait-queue are guarded
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 347) * by both the lock in the wait-queue-head and by
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 348) * the kmap_lock. As the kmap_lock is held here,
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 349) * no need for the wait-queue-head's lock. Simply
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 350) * test if the queue is empty.
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 351) */
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 352) pkmap_map_wait = get_pkmap_wait_queue_head(color);
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 353) need_wakeup = waitqueue_active(pkmap_map_wait);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 354) }
3297e760776af (Nicolas Pitre 2009-03-04 22:49:41 -0500 355) unlock_kmap_any(flags);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 356)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 357) /* do wake-up, if needed, race-free outside of the spin lock */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 358) if (need_wakeup)
15de36a4c3cf3 (Max Filippov 2014-08-06 16:08:23 -0700 359) wake_up(pkmap_map_wait);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 360) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 361) EXPORT_SYMBOL(kunmap_high);
0060ef3b4e6dd (Matthew Wilcox (Oracle) 2020-12-14 19:12:59 -0800 362)
0060ef3b4e6dd (Matthew Wilcox (Oracle) 2020-12-14 19:12:59 -0800 363) #ifdef CONFIG_TRANSPARENT_HUGEPAGE
0060ef3b4e6dd (Matthew Wilcox (Oracle) 2020-12-14 19:12:59 -0800 364) void zero_user_segments(struct page *page, unsigned start1, unsigned end1,
0060ef3b4e6dd (Matthew Wilcox (Oracle) 2020-12-14 19:12:59 -0800 365) unsigned start2, unsigned end2)
0060ef3b4e6dd (Matthew Wilcox (Oracle) 2020-12-14 19:12:59 -0800 366) {
0060ef3b4e6dd (Matthew Wilcox (Oracle) 2020-12-14 19:12:59 -0800 367) unsigned int i;
0060ef3b4e6dd (Matthew Wilcox (Oracle) 2020-12-14 19:12:59 -0800 368)
0060ef3b4e6dd (Matthew Wilcox (Oracle) 2020-12-14 19:12:59 -0800 369) BUG_ON(end1 > page_size(page) || end2 > page_size(page));
0060ef3b4e6dd (Matthew Wilcox (Oracle) 2020-12-14 19:12:59 -0800 370)
184cee516f3e2 (OGAWA Hirofumi 2021-03-12 21:07:37 -0800 371) if (start1 >= end1)
184cee516f3e2 (OGAWA Hirofumi 2021-03-12 21:07:37 -0800 372) start1 = end1 = 0;
184cee516f3e2 (OGAWA Hirofumi 2021-03-12 21:07:37 -0800 373) if (start2 >= end2)
184cee516f3e2 (OGAWA Hirofumi 2021-03-12 21:07:37 -0800 374) start2 = end2 = 0;
184cee516f3e2 (OGAWA Hirofumi 2021-03-12 21:07:37 -0800 375)
0060ef3b4e6dd (Matthew Wilcox (Oracle) 2020-12-14 19:12:59 -0800 376) for (i = 0; i < compound_nr(page); i++) {
0060ef3b4e6dd (Matthew Wilcox (Oracle) 2020-12-14 19:12:59 -0800 377) void *kaddr = NULL;
0060ef3b4e6dd (Matthew Wilcox (Oracle) 2020-12-14 19:12:59 -0800 378)
0060ef3b4e6dd (Matthew Wilcox (Oracle) 2020-12-14 19:12:59 -0800 379) if (start1 >= PAGE_SIZE) {
0060ef3b4e6dd (Matthew Wilcox (Oracle) 2020-12-14 19:12:59 -0800 380) start1 -= PAGE_SIZE;
0060ef3b4e6dd (Matthew Wilcox (Oracle) 2020-12-14 19:12:59 -0800 381) end1 -= PAGE_SIZE;
0060ef3b4e6dd (Matthew Wilcox (Oracle) 2020-12-14 19:12:59 -0800 382) } else {
0060ef3b4e6dd (Matthew Wilcox (Oracle) 2020-12-14 19:12:59 -0800 383) unsigned this_end = min_t(unsigned, end1, PAGE_SIZE);
0060ef3b4e6dd (Matthew Wilcox (Oracle) 2020-12-14 19:12:59 -0800 384)
184cee516f3e2 (OGAWA Hirofumi 2021-03-12 21:07:37 -0800 385) if (end1 > start1) {
184cee516f3e2 (OGAWA Hirofumi 2021-03-12 21:07:37 -0800 386) kaddr = kmap_atomic(page + i);
0060ef3b4e6dd (Matthew Wilcox (Oracle) 2020-12-14 19:12:59 -0800 387) memset(kaddr + start1, 0, this_end - start1);
184cee516f3e2 (OGAWA Hirofumi 2021-03-12 21:07:37 -0800 388) }
0060ef3b4e6dd (Matthew Wilcox (Oracle) 2020-12-14 19:12:59 -0800 389) end1 -= this_end;
0060ef3b4e6dd (Matthew Wilcox (Oracle) 2020-12-14 19:12:59 -0800 390) start1 = 0;
0060ef3b4e6dd (Matthew Wilcox (Oracle) 2020-12-14 19:12:59 -0800 391) }
0060ef3b4e6dd (Matthew Wilcox (Oracle) 2020-12-14 19:12:59 -0800 392)
0060ef3b4e6dd (Matthew Wilcox (Oracle) 2020-12-14 19:12:59 -0800 393) if (start2 >= PAGE_SIZE) {
0060ef3b4e6dd (Matthew Wilcox (Oracle) 2020-12-14 19:12:59 -0800 394) start2 -= PAGE_SIZE;
0060ef3b4e6dd (Matthew Wilcox (Oracle) 2020-12-14 19:12:59 -0800 395) end2 -= PAGE_SIZE;
0060ef3b4e6dd (Matthew Wilcox (Oracle) 2020-12-14 19:12:59 -0800 396) } else {
0060ef3b4e6dd (Matthew Wilcox (Oracle) 2020-12-14 19:12:59 -0800 397) unsigned this_end = min_t(unsigned, end2, PAGE_SIZE);
0060ef3b4e6dd (Matthew Wilcox (Oracle) 2020-12-14 19:12:59 -0800 398)
184cee516f3e2 (OGAWA Hirofumi 2021-03-12 21:07:37 -0800 399) if (end2 > start2) {
184cee516f3e2 (OGAWA Hirofumi 2021-03-12 21:07:37 -0800 400) if (!kaddr)
184cee516f3e2 (OGAWA Hirofumi 2021-03-12 21:07:37 -0800 401) kaddr = kmap_atomic(page + i);
0060ef3b4e6dd (Matthew Wilcox (Oracle) 2020-12-14 19:12:59 -0800 402) memset(kaddr + start2, 0, this_end - start2);
184cee516f3e2 (OGAWA Hirofumi 2021-03-12 21:07:37 -0800 403) }
0060ef3b4e6dd (Matthew Wilcox (Oracle) 2020-12-14 19:12:59 -0800 404) end2 -= this_end;
0060ef3b4e6dd (Matthew Wilcox (Oracle) 2020-12-14 19:12:59 -0800 405) start2 = 0;
0060ef3b4e6dd (Matthew Wilcox (Oracle) 2020-12-14 19:12:59 -0800 406) }
0060ef3b4e6dd (Matthew Wilcox (Oracle) 2020-12-14 19:12:59 -0800 407)
0060ef3b4e6dd (Matthew Wilcox (Oracle) 2020-12-14 19:12:59 -0800 408) if (kaddr) {
0060ef3b4e6dd (Matthew Wilcox (Oracle) 2020-12-14 19:12:59 -0800 409) kunmap_atomic(kaddr);
0060ef3b4e6dd (Matthew Wilcox (Oracle) 2020-12-14 19:12:59 -0800 410) flush_dcache_page(page + i);
0060ef3b4e6dd (Matthew Wilcox (Oracle) 2020-12-14 19:12:59 -0800 411) }
0060ef3b4e6dd (Matthew Wilcox (Oracle) 2020-12-14 19:12:59 -0800 412)
0060ef3b4e6dd (Matthew Wilcox (Oracle) 2020-12-14 19:12:59 -0800 413) if (!end1 && !end2)
0060ef3b4e6dd (Matthew Wilcox (Oracle) 2020-12-14 19:12:59 -0800 414) break;
0060ef3b4e6dd (Matthew Wilcox (Oracle) 2020-12-14 19:12:59 -0800 415) }
0060ef3b4e6dd (Matthew Wilcox (Oracle) 2020-12-14 19:12:59 -0800 416)
0060ef3b4e6dd (Matthew Wilcox (Oracle) 2020-12-14 19:12:59 -0800 417) BUG_ON((start1 | start2 | end1 | end2) != 0);
0060ef3b4e6dd (Matthew Wilcox (Oracle) 2020-12-14 19:12:59 -0800 418) }
0060ef3b4e6dd (Matthew Wilcox (Oracle) 2020-12-14 19:12:59 -0800 419) EXPORT_SYMBOL(zero_user_segments);
0060ef3b4e6dd (Matthew Wilcox (Oracle) 2020-12-14 19:12:59 -0800 420) #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 421) #endif /* CONFIG_HIGHMEM */
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 422)
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 423) #ifdef CONFIG_KMAP_LOCAL
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 424)
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 425) #include <asm/kmap_size.h>
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 426)
389755c250814 (Thomas Gleixner 2020-11-03 10:27:19 +0100 427) /*
6e799cb69a70e (Thomas Gleixner 2020-11-18 20:48:39 +0100 428) * With DEBUG_KMAP_LOCAL the stack depth is doubled and every second
389755c250814 (Thomas Gleixner 2020-11-03 10:27:19 +0100 429) * slot is unused which acts as a guard page
389755c250814 (Thomas Gleixner 2020-11-03 10:27:19 +0100 430) */
6e799cb69a70e (Thomas Gleixner 2020-11-18 20:48:39 +0100 431) #ifdef CONFIG_DEBUG_KMAP_LOCAL
389755c250814 (Thomas Gleixner 2020-11-03 10:27:19 +0100 432) # define KM_INCR 2
389755c250814 (Thomas Gleixner 2020-11-03 10:27:19 +0100 433) #else
389755c250814 (Thomas Gleixner 2020-11-03 10:27:19 +0100 434) # define KM_INCR 1
389755c250814 (Thomas Gleixner 2020-11-03 10:27:19 +0100 435) #endif
389755c250814 (Thomas Gleixner 2020-11-03 10:27:19 +0100 436)
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 437) static inline int kmap_local_idx_push(void)
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 438) {
ea0eafead4b66 (Changbin Du 2021-09-07 19:56:12 -0700 439) WARN_ON_ONCE(in_hardirq() && !irqs_disabled());
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 440) current->kmap_ctrl.idx += KM_INCR;
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 441) BUG_ON(current->kmap_ctrl.idx >= KM_MAX_IDX);
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 442) return current->kmap_ctrl.idx - 1;
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 443) }
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 444)
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 445) static inline int kmap_local_idx(void)
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 446) {
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 447) return current->kmap_ctrl.idx - 1;
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 448) }
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 449)
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 450) static inline void kmap_local_idx_pop(void)
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 451) {
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 452) current->kmap_ctrl.idx -= KM_INCR;
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 453) BUG_ON(current->kmap_ctrl.idx < 0);
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 454) }
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 455)
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 456) #ifndef arch_kmap_local_post_map
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 457) # define arch_kmap_local_post_map(vaddr, pteval) do { } while (0)
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 458) #endif
3c1016b53c311 (Thomas Gleixner 2020-11-03 10:27:31 +0100 459)
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 460) #ifndef arch_kmap_local_pre_unmap
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 461) # define arch_kmap_local_pre_unmap(vaddr) do { } while (0)
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 462) #endif
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 463)
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 464) #ifndef arch_kmap_local_post_unmap
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 465) # define arch_kmap_local_post_unmap(vaddr) do { } while (0)
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 466) #endif
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 467)
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 468) #ifndef arch_kmap_local_map_idx
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 469) #define arch_kmap_local_map_idx(idx, pfn) kmap_local_calc_idx(idx)
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 470) #endif
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 471)
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 472) #ifndef arch_kmap_local_unmap_idx
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 473) #define arch_kmap_local_unmap_idx(idx, vaddr) kmap_local_calc_idx(idx)
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 474) #endif
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 475)
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 476) #ifndef arch_kmap_local_high_get
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 477) static inline void *arch_kmap_local_high_get(struct page *page)
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 478) {
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 479) return NULL;
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 480) }
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 481) #endif
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 482)
a1dce7fd2ade8 (Thomas Gleixner 2021-01-23 21:02:02 -0800 483) #ifndef arch_kmap_local_set_pte
a1dce7fd2ade8 (Thomas Gleixner 2021-01-23 21:02:02 -0800 484) #define arch_kmap_local_set_pte(mm, vaddr, ptep, ptev) \
a1dce7fd2ade8 (Thomas Gleixner 2021-01-23 21:02:02 -0800 485) set_pte_at(mm, vaddr, ptep, ptev)
a1dce7fd2ade8 (Thomas Gleixner 2021-01-23 21:02:02 -0800 486) #endif
a1dce7fd2ade8 (Thomas Gleixner 2021-01-23 21:02:02 -0800 487)
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 488) /* Unmap a local mapping which was obtained by kmap_high_get() */
2a656cad337e0 (Thomas Gleixner 2020-11-12 11:59:32 +0100 489) static inline bool kmap_high_unmap_local(unsigned long vaddr)
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 490) {
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 491) #ifdef ARCH_NEEDS_KMAP_HIGH_GET
2a656cad337e0 (Thomas Gleixner 2020-11-12 11:59:32 +0100 492) if (vaddr >= PKMAP_ADDR(0) && vaddr < PKMAP_ADDR(LAST_PKMAP)) {
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 493) kunmap_high(pte_page(pkmap_page_table[PKMAP_NR(vaddr)]));
2a656cad337e0 (Thomas Gleixner 2020-11-12 11:59:32 +0100 494) return true;
2a656cad337e0 (Thomas Gleixner 2020-11-12 11:59:32 +0100 495) }
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 496) #endif
2a656cad337e0 (Thomas Gleixner 2020-11-12 11:59:32 +0100 497) return false;
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 498) }
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 499)
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 500) static inline int kmap_local_calc_idx(int idx)
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 501) {
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 502) return idx + KM_MAX_IDX * smp_processor_id();
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 503) }
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 504)
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 505) static pte_t *__kmap_pte;
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 506)
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 507) static pte_t *kmap_get_pte(void)
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 508) {
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 509) if (!__kmap_pte)
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 510) __kmap_pte = virt_to_kpte(__fix_to_virt(FIX_KMAP_BEGIN));
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 511) return __kmap_pte;
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 512) }
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 513)
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 514) void *__kmap_local_pfn_prot(unsigned long pfn, pgprot_t prot)
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 515) {
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 516) pte_t pteval, *kmap_pte = kmap_get_pte();
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 517) unsigned long vaddr;
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 518) int idx;
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 519)
f3ba3c710ac5a (Thomas Gleixner 2020-11-18 20:48:44 +0100 520) /*
f3ba3c710ac5a (Thomas Gleixner 2020-11-18 20:48:44 +0100 521) * Disable migration so resulting virtual address is stable
f0953a1bbaca7 (Ingo Molnar 2021-05-06 18:06:47 -0700 522) * across preemption.
f3ba3c710ac5a (Thomas Gleixner 2020-11-18 20:48:44 +0100 523) */
f3ba3c710ac5a (Thomas Gleixner 2020-11-18 20:48:44 +0100 524) migrate_disable();
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 525) preempt_disable();
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 526) idx = arch_kmap_local_map_idx(kmap_local_idx_push(), pfn);
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 527) vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 528) BUG_ON(!pte_none(*(kmap_pte - idx)));
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 529) pteval = pfn_pte(pfn, prot);
a1dce7fd2ade8 (Thomas Gleixner 2021-01-23 21:02:02 -0800 530) arch_kmap_local_set_pte(&init_mm, vaddr, kmap_pte - idx, pteval);
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 531) arch_kmap_local_post_map(vaddr, pteval);
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 532) current->kmap_ctrl.pteval[kmap_local_idx()] = pteval;
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 533) preempt_enable();
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 534)
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 535) return (void *)vaddr;
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 536) }
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 537) EXPORT_SYMBOL_GPL(__kmap_local_pfn_prot);
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 538)
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 539) void *__kmap_local_page_prot(struct page *page, pgprot_t prot)
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 540) {
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 541) void *kmap;
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 542)
0e91a0c6984c8 (Thomas Gleixner 2020-11-18 20:48:40 +0100 543) /*
0e91a0c6984c8 (Thomas Gleixner 2020-11-18 20:48:40 +0100 544) * To broaden the usage of the actual kmap_local() machinery always map
0e91a0c6984c8 (Thomas Gleixner 2020-11-18 20:48:40 +0100 545) * pages when debugging is enabled and the architecture has no problems
0e91a0c6984c8 (Thomas Gleixner 2020-11-18 20:48:40 +0100 546) * with alias mappings.
0e91a0c6984c8 (Thomas Gleixner 2020-11-18 20:48:40 +0100 547) */
0e91a0c6984c8 (Thomas Gleixner 2020-11-18 20:48:40 +0100 548) if (!IS_ENABLED(CONFIG_DEBUG_KMAP_LOCAL_FORCE_MAP) && !PageHighMem(page))
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 549) return page_address(page);
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 550)
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 551) /* Try kmap_high_get() if architecture has it enabled */
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 552) kmap = arch_kmap_local_high_get(page);
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 553) if (kmap)
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 554) return kmap;
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 555)
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 556) return __kmap_local_pfn_prot(page_to_pfn(page), prot);
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 557) }
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 558) EXPORT_SYMBOL(__kmap_local_page_prot);
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 559)
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 560) void kunmap_local_indexed(void *vaddr)
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 561) {
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 562) unsigned long addr = (unsigned long) vaddr & PAGE_MASK;
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 563) pte_t *kmap_pte = kmap_get_pte();
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 564) int idx;
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 565)
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 566) if (addr < __fix_to_virt(FIX_KMAP_END) ||
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 567) addr > __fix_to_virt(FIX_KMAP_BEGIN)) {
0e91a0c6984c8 (Thomas Gleixner 2020-11-18 20:48:40 +0100 568) if (IS_ENABLED(CONFIG_DEBUG_KMAP_LOCAL_FORCE_MAP)) {
0e91a0c6984c8 (Thomas Gleixner 2020-11-18 20:48:40 +0100 569) /* This _should_ never happen! See above. */
0e91a0c6984c8 (Thomas Gleixner 2020-11-18 20:48:40 +0100 570) WARN_ON_ONCE(1);
0e91a0c6984c8 (Thomas Gleixner 2020-11-18 20:48:40 +0100 571) return;
0e91a0c6984c8 (Thomas Gleixner 2020-11-18 20:48:40 +0100 572) }
2a656cad337e0 (Thomas Gleixner 2020-11-12 11:59:32 +0100 573) /*
2a656cad337e0 (Thomas Gleixner 2020-11-12 11:59:32 +0100 574) * Handle mappings which were obtained by kmap_high_get()
2a656cad337e0 (Thomas Gleixner 2020-11-12 11:59:32 +0100 575) * first as the virtual address of such mappings is below
2a656cad337e0 (Thomas Gleixner 2020-11-12 11:59:32 +0100 576) * PAGE_OFFSET. Warn for all other addresses which are in
2a656cad337e0 (Thomas Gleixner 2020-11-12 11:59:32 +0100 577) * the user space part of the virtual address space.
2a656cad337e0 (Thomas Gleixner 2020-11-12 11:59:32 +0100 578) */
2a656cad337e0 (Thomas Gleixner 2020-11-12 11:59:32 +0100 579) if (!kmap_high_unmap_local(addr))
2a656cad337e0 (Thomas Gleixner 2020-11-12 11:59:32 +0100 580) WARN_ON_ONCE(addr < PAGE_OFFSET);
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 581) return;
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 582) }
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 583)
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 584) preempt_disable();
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 585) idx = arch_kmap_local_unmap_idx(kmap_local_idx(), addr);
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 586) WARN_ON_ONCE(addr != __fix_to_virt(FIX_KMAP_BEGIN + idx));
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 587)
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 588) arch_kmap_local_pre_unmap(addr);
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 589) pte_clear(&init_mm, addr, kmap_pte - idx);
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 590) arch_kmap_local_post_unmap(addr);
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 591) current->kmap_ctrl.pteval[kmap_local_idx()] = __pte(0);
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 592) kmap_local_idx_pop();
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 593) preempt_enable();
f3ba3c710ac5a (Thomas Gleixner 2020-11-18 20:48:44 +0100 594) migrate_enable();
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 595) }
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 596) EXPORT_SYMBOL(kunmap_local_indexed);
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 597)
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 598) /*
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 599) * Invoked before switch_to(). This is safe even when during or after
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 600) * clearing the maps an interrupt which needs a kmap_local happens because
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 601) * the task::kmap_ctrl.idx is not modified by the unmapping code so a
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 602) * nested kmap_local will use the next unused index and restore the index
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 603) * on unmap. The already cleared kmaps of the outgoing task are irrelevant
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 604) * because the interrupt context does not know about them. The same applies
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 605) * when scheduling back in for an interrupt which happens before the
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 606) * restore is complete.
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 607) */
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 608) void __kmap_local_sched_out(void)
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 609) {
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 610) struct task_struct *tsk = current;
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 611) pte_t *kmap_pte = kmap_get_pte();
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 612) int i;
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 613)
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 614) /* Clear kmaps */
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 615) for (i = 0; i < tsk->kmap_ctrl.idx; i++) {
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 616) pte_t pteval = tsk->kmap_ctrl.pteval[i];
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 617) unsigned long addr;
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 618) int idx;
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 619)
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 620) /* With debug all even slots are unmapped and act as guard */
487cfade12fae (Ira Weiny 2021-03-24 21:37:53 -0700 621) if (IS_ENABLED(CONFIG_DEBUG_KMAP_LOCAL) && !(i & 0x01)) {
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 622) WARN_ON_ONCE(!pte_none(pteval));
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 623) continue;
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 624) }
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 625) if (WARN_ON_ONCE(pte_none(pteval)))
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 626) continue;
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 627)
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 628) /*
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 629) * This is a horrible hack for XTENSA to calculate the
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 630) * coloured PTE index. Uses the PFN encoded into the pteval
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 631) * and the map index calculation because the actual mapped
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 632) * virtual address is not stored in task::kmap_ctrl.
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 633) * For any sane architecture this is optimized out.
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 634) */
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 635) idx = arch_kmap_local_map_idx(i, pte_pfn(pteval));
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 636)
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 637) addr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 638) arch_kmap_local_pre_unmap(addr);
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 639) pte_clear(&init_mm, addr, kmap_pte - idx);
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 640) arch_kmap_local_post_unmap(addr);
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 641) }
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 642) }
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 643)
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 644) void __kmap_local_sched_in(void)
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 645) {
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 646) struct task_struct *tsk = current;
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 647) pte_t *kmap_pte = kmap_get_pte();
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 648) int i;
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 649)
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 650) /* Restore kmaps */
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 651) for (i = 0; i < tsk->kmap_ctrl.idx; i++) {
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 652) pte_t pteval = tsk->kmap_ctrl.pteval[i];
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 653) unsigned long addr;
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 654) int idx;
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 655)
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 656) /* With debug all even slots are unmapped and act as guard */
487cfade12fae (Ira Weiny 2021-03-24 21:37:53 -0700 657) if (IS_ENABLED(CONFIG_DEBUG_KMAP_LOCAL) && !(i & 0x01)) {
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 658) WARN_ON_ONCE(!pte_none(pteval));
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 659) continue;
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 660) }
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 661) if (WARN_ON_ONCE(pte_none(pteval)))
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 662) continue;
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 663)
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 664) /* See comment in __kmap_local_sched_out() */
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 665) idx = arch_kmap_local_map_idx(i, pte_pfn(pteval));
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 666) addr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 667) set_pte_at(&init_mm, addr, kmap_pte - idx, pteval);
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 668) arch_kmap_local_post_map(addr, pteval);
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 669) }
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 670) }
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 671)
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 672) void kmap_local_fork(struct task_struct *tsk)
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 673) {
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 674) if (WARN_ON_ONCE(tsk->kmap_ctrl.idx))
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 675) memset(&tsk->kmap_ctrl, 0, sizeof(tsk->kmap_ctrl));
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 676) }
5fbda3ecd14a5 (Thomas Gleixner 2020-11-18 20:48:43 +0100 677)
298fa1ad5571f (Thomas Gleixner 2020-11-03 10:27:18 +0100 678) #endif
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 679)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 680) #if defined(HASHED_PAGE_VIRTUAL)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 681)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 682) #define PA_HASH_ORDER 7
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 683)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 684) /*
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 685) * Describes one page->virtual association
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 686) */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 687) struct page_address_map {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 688) struct page *page;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 689) void *virtual;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 690) struct list_head list;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 691) };
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 692)
a354e2c84eeeb (Joonsoo Kim 2012-12-11 16:01:23 -0800 693) static struct page_address_map page_address_maps[LAST_PKMAP];
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 694)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 695) /*
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 696) * Hash table bucket
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 697) */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 698) static struct page_address_slot {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 699) struct list_head lh; /* List of page_address_maps */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 700) spinlock_t lock; /* Protect this bucket's list */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 701) } ____cacheline_aligned_in_smp page_address_htable[1<<PA_HASH_ORDER];
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 702)
f991879473828 (Ian Campbell 2011-08-17 13:45:09 +0100 703) static struct page_address_slot *page_slot(const struct page *page)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 704) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 705) return &page_address_htable[hash_ptr(page, PA_HASH_ORDER)];
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 706) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 707)
77f6078aa8945 (Randy Dunlap 2008-03-19 17:00:42 -0700 708) /**
77f6078aa8945 (Randy Dunlap 2008-03-19 17:00:42 -0700 709) * page_address - get the mapped virtual address of a page
77f6078aa8945 (Randy Dunlap 2008-03-19 17:00:42 -0700 710) * @page: &struct page to get the virtual address of
77f6078aa8945 (Randy Dunlap 2008-03-19 17:00:42 -0700 711) *
77f6078aa8945 (Randy Dunlap 2008-03-19 17:00:42 -0700 712) * Returns the page's virtual address.
77f6078aa8945 (Randy Dunlap 2008-03-19 17:00:42 -0700 713) */
f991879473828 (Ian Campbell 2011-08-17 13:45:09 +0100 714) void *page_address(const struct page *page)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 715) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 716) unsigned long flags;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 717) void *ret;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 718) struct page_address_slot *pas;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 719)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 720) if (!PageHighMem(page))
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 721) return lowmem_page_address(page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 722)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 723) pas = page_slot(page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 724) ret = NULL;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 725) spin_lock_irqsave(&pas->lock, flags);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 726) if (!list_empty(&pas->lh)) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 727) struct page_address_map *pam;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 728)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 729) list_for_each_entry(pam, &pas->lh, list) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 730) if (pam->page == page) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 731) ret = pam->virtual;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 732) goto done;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 733) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 734) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 735) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 736) done:
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 737) spin_unlock_irqrestore(&pas->lock, flags);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 738) return ret;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 739) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 740) EXPORT_SYMBOL(page_address);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 741)
77f6078aa8945 (Randy Dunlap 2008-03-19 17:00:42 -0700 742) /**
77f6078aa8945 (Randy Dunlap 2008-03-19 17:00:42 -0700 743) * set_page_address - set a page's virtual address
77f6078aa8945 (Randy Dunlap 2008-03-19 17:00:42 -0700 744) * @page: &struct page to set
77f6078aa8945 (Randy Dunlap 2008-03-19 17:00:42 -0700 745) * @virtual: virtual address to use
77f6078aa8945 (Randy Dunlap 2008-03-19 17:00:42 -0700 746) */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 747) void set_page_address(struct page *page, void *virtual)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 748) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 749) unsigned long flags;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 750) struct page_address_slot *pas;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 751) struct page_address_map *pam;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 752)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 753) BUG_ON(!PageHighMem(page));
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 754)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 755) pas = page_slot(page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 756) if (virtual) { /* Add */
a354e2c84eeeb (Joonsoo Kim 2012-12-11 16:01:23 -0800 757) pam = &page_address_maps[PKMAP_NR((unsigned long)virtual)];
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 758) pam->page = page;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 759) pam->virtual = virtual;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 760)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 761) spin_lock_irqsave(&pas->lock, flags);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 762) list_add_tail(&pam->list, &pas->lh);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 763) spin_unlock_irqrestore(&pas->lock, flags);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 764) } else { /* Remove */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 765) spin_lock_irqsave(&pas->lock, flags);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 766) list_for_each_entry(pam, &pas->lh, list) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 767) if (pam->page == page) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 768) list_del(&pam->list);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 769) spin_unlock_irqrestore(&pas->lock, flags);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 770) goto done;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 771) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 772) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 773) spin_unlock_irqrestore(&pas->lock, flags);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 774) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 775) done:
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 776) return;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 777) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 778)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 779) void __init page_address_init(void)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 780) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 781) int i;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 782)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 783) for (i = 0; i < ARRAY_SIZE(page_address_htable); i++) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 784) INIT_LIST_HEAD(&page_address_htable[i].lh);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 785) spin_lock_init(&page_address_htable[i].lock);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 786) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 787) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 788)
955cc774f286a (Ira Weiny 2020-10-15 20:09:52 -0700 789) #endif /* defined(HASHED_PAGE_VIRTUAL) */
VisionFive2 Linux kernel
StarFive Tech Linux Kernel for VisionFive (JH7110) boards (mirror)
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