90 lines
2.1 KiB
C
Executable file
90 lines
2.1 KiB
C
Executable file
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2020 MediaTek Inc.
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*/
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#include <linux/uaccess.h>
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/platform_device.h>
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#include <linux/cdev.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/sched.h>
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#include <linux/wait.h>
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#include <linux/spinlock.h>
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#include <linux/delay.h>
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/* #include <linux/earlysuspend.h> */
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#include <linux/mm.h>
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#include <linux/vmalloc.h>
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#include <linux/dma-mapping.h>
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#include <linux/slab.h>
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/* #include <linux/aee.h> */
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#include <linux/timer.h>
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#include <linux/cache.h>
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/* #include <linux/printk.h> */
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#include <linux/highmem.h>
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#ifdef pr_fmt
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#undef pr_fmt
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#endif
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#define pr_fmt(fmt) "["KBUILD_MODNAME"]" fmt
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unsigned long pmem_user_v2p_video(unsigned long va)
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{
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unsigned long pageOffset = (va & (PAGE_SIZE - 1));
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pgd_t *pgd;
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pud_t *pud;
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pmd_t *pmd;
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pte_t *pte;
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unsigned long pa;
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if (current == NULL) {
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pr_info("[ERROR] %s, current is NULL!\n", __func__);
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return 0;
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}
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if (current->mm == NULL) {
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pr_info("[ERROR] v2p, mm is NULL! tgid=0x%x, name=%s\n",
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current->tgid, current->comm);
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return 0;
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}
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spin_lock(¤t->mm->page_table_lock);
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pgd = pgd_offset(current->mm, va); /* what is tsk->mm */
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if (pgd_none(*pgd) || pgd_bad(*pgd)) {
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pr_info("[ERROR] v2p, va=0x%lx, pgd invalid!\n", va);
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spin_unlock(¤t->mm->page_table_lock);
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return 0;
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}
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pud = pud_offset(pgd, va);
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if (pud_none(*pud) || pud_bad(*pud)) {
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pr_info("[ERROR] v2p, va=0x%lx, pud invalid!\n", va);
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spin_unlock(¤t->mm->page_table_lock);
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return 0;
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}
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pmd = pmd_offset(pud, va);
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if (pmd_none(*pmd) || pmd_bad(*pmd)) {
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pr_info("[ERROR] v2p(), va=0x%lx, pmd invalid!\n", va);
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spin_unlock(¤t->mm->page_table_lock);
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return 0;
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}
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pte = pte_offset_map(pmd, va);
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if (pte_present(*pte)) {
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pa = (pte_val(*pte) & PHYS_MASK & (PAGE_MASK)) | pageOffset;
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pte_unmap(pte);
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spin_unlock(¤t->mm->page_table_lock);
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return pa;
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}
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pte_unmap(pte);
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pr_info("[ERROR] v2p, va=0x%lx, pte invalid!\n", va);
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spin_unlock(¤t->mm->page_table_lock);
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return 0;
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}
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EXPORT_SYMBOL(pmem_user_v2p_video);
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