index : tmux	master
	Mirror of https://github.com/tmux/tmux	matthias

summaryrefslogtreecommitdiffstats

log msg author committer range

path: root/control.c

Age	Commit message (Expand)	Author
2017-01-15	It is silly for cmd_list_parse to return an integer error when it could	nicm
2016-10-16	Mass rename struct cmd_q to struct cmdq_item and related.	nicm
2016-10-16	Rewrite command queue handling. Each client still has a command queue,	nicm
2016-01-19	I no longer use my SourceForge address so replace it.	nicm
2015-11-18	Use __unused rather than rolling our own.	nicm
2015-11-14	Push stdout and stderr to clients more aggressively, and add an event to	nicm
2015-04-19	Rewrite of tmux mouse support which was a mess. Instead of having	nicm
2014-10-20	Better format for printf format attributes.	nicm
2013-10-10	Pass flags into cmdq_guard as an argument since sometimes cmdq->cmd can	nicm
2013-06-23	Mark control commands specially so the client can identify them, based	Nicholas Marriott
2013-03-26	Fix compiler warnings, missing #include. From Thomas Adam.	Nicholas Marriott
2013-03-25	Add time and a command count to control mode guards, based on code from	Nicholas Marriott
2013-03-24	Add a command queue to standardize and simplify commands that call other	Nicholas Marriott
2013-03-22	Need to set clients in context before changing their reference count.	Nicholas Marriott
2013-03-22	Remove unnecessary initializers of cmd_ctx.	Nicholas Marriott
2012-09-24	Add control_write_buffer, from George Nachman.	Nicholas Marriott
2012-09-03	Send notifications to control clients. Also don't redraw client when	Nicholas Marriott
2012-07-10	xfree is not particularly helpful, remove it. From Thomas Adam.	Nicholas Marriott
2012-06-18	Add a skeleton mode to tmux (called "control mode") that let's tmux	Nicholas Marriott

generated by cgit v1.2.3 (git 2.25.1) at 2024-09-09 06:08:21 +0000

// SPDX-License-Identifier: GPL-2.0
#include <linux/pagewalk.h>
#include <linux/highmem.h>
#include <linux/sched.h>
#include <linux/hugetlb.h>

static int walk_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
			  struct mm_walk *walk)
{
	pte_t *pte;
	int err = 0;
	const struct mm_walk_ops *ops = walk->ops;
	spinlock_t *ptl;

	pte = pte_offset_map_lock(walk->mm, pmd, addr, &ptl);
	for (;;) {
		err = ops->pte_entry(pte, addr, addr + PAGE_SIZE, walk);
		if (err)
		       break;
		addr += PAGE_SIZE;
		if (addr == end)
			break;
		pte++;
	}

	pte_unmap_unlock(pte, ptl);
	return err;
}

static int walk_pmd_range(pud_t *pud, unsigned long addr, unsigned long end,
			  struct mm_walk *walk)
{
	pmd_t *pmd;
	unsigned long next;
	const struct mm_walk_ops *ops = walk->ops;
	int err = 0;

	pmd = pmd_offset(pud, addr);
	do {
again:
		next = pmd_addr_end(addr, end);
		if (pmd_none(*pmd) || !walk->vma) {
			if (ops->pte_hole)
				err = ops->pte_hole(addr, next, walk);
			if (err)
				break;
			continue;
		}
		/*
		 * This implies that each ->pmd_entry() handler
		 * needs to know about pmd_trans_huge() pmds
		 */
		if (ops->pmd_entry)
			err = ops->pmd_entry(pmd, addr, next, walk);
		if (err)
			break;

		/*
		 * Check this here so we only break down trans_huge
		 * pages when we _need_ to
		 */
		if (!ops->pte_entry)
			continue;

		split_huge_pmd(walk->vma, pmd, addr);
		if (pmd_trans_unstable(pmd))
			goto again;
		err = walk_pte_range(pmd, addr, next, walk);
		if (err)
			break;
	} while (pmd++, addr = next, addr != end);

	return err;
}

static int walk_pud_range(p4d_t *p4d, unsigned long addr, unsigned long end,
			  struct mm_walk *walk)
{
	pud_t *pud;
	unsigned long next;
	const struct mm_walk_ops *ops = walk->ops;
	int err = 0;

	pud = pud_offset(p4d, addr);
	do {
 again:
		next = pud_addr_end(addr, end);
		if (pud_none(*pud) || !walk->vma) {
			if (ops->pte_hole)
				err = ops->pte_hole(addr, next, walk);
			if (err)
				break;
			continue;
		}

		if (ops->pud_entry) {
			spinlock_t *ptl = pud_trans_huge_lock(pud, walk->vma);

			if (ptl) {
				err = ops->pud_entry(pud, addr, next, walk);
				spin_unlock(ptl);
				if (err)
					break;
				continue;
			}
		}

		split_huge_pud(walk->vma, pud, addr);
		if (pud_none(*pud))
			goto again;

		if (ops->pmd_entry || ops->pte_entry)
			err = walk_pmd_range(pud, addr, next, walk);
		if (err)
			break;
	} while (pud++, addr = next, addr != end);

	return err;
}

static int walk_p4d_range(pgd_t *pgd, unsigned long addr, unsigned long end,
			  struct mm_walk *walk)
{
	p4d_t *p4d;
	unsigned long next;
	const struct mm_walk_ops *ops = walk->ops;
	int err = 0;

	p4d = p4d_offset(pgd, addr);
	do {
		next = p4d_addr_end(addr, end);
		if (p4d_none_or_clear_bad(p4d)) {
			if (ops->pte_hole)
				err = ops->pte_hole(addr, next, walk);
			if (err)
				break;
			continue;
		}
		if (ops->pmd_entry || ops->pte_entry)
			err = walk_pud_range(p4d, addr, next, walk);
		if (err)
			break;
	} while (p4d++, addr = next, addr != end);

	return err;
}

static int walk_pgd_range(unsigned long addr, unsigned long end,
			  struct mm_walk *walk)
{
	pgd_t *pgd;
	unsigned long next;
	const struct mm_walk_ops *ops = walk->ops;
	int err = 0;

	pgd = pgd_offset(walk->mm, addr);
	do {
		next = pgd_addr_end(addr, end);
		if (pgd_none_or_clear_bad(pgd)) {
			if (ops->pte_hole)
				err = ops->pte_hole(addr, next, walk);
			if (err)
				break;
			continue;
		}
		if (ops->pmd_entry || ops->pte_entry)
			err = walk_p4d_range(pgd, addr, next, walk);
		if (err)
			break;
	} while (pgd++, addr = next, addr != end);

	return err;
}

#ifdef CONFIG_HUGETLB_PAGE
static unsigned long hugetlb_entry_end(struct hstate *h, unsigned long addr,
				       unsigned long end)
{
	unsigned long boundary = (addr & huge_page_mask(h)) + huge_page_size(h);
	return boundary < end ? boundary : end;
}

static int walk_hugetlb_range(unsigned long addr, unsigned long end,
			      struct mm_walk *walk)
{
	struct vm_area_struct *vma = walk->vma;
	struct hstate *h = hstate_vma(vma);
	unsigned long next;
	unsigned long hmask = huge_page_mask(h);
	unsigned long sz = huge_page_size(h);
	pte_t *pte;
	const struct mm_walk_ops *ops = walk->ops;
	int err = 0;

	do {
		next = hugetlb_entry_end(h, addr, end);
		pte = huge_pte_offset(walk->mm, addr & hmask, sz);

		if (pte)
			err = ops->hugetlb_entry(pte, hmask, addr, next, walk);
		else if (ops->pte_hole)
			err = ops->pte_hole(addr, next, walk);

		if (err)
			break;
	} while (addr = next, addr != end);

	return err;
}

#else /* CONFIG_HUGETLB_PAGE */
static int wal