Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

#include <linux/mm.h>

#include <linux/hugetlb.h>

#include <linux/mount.h>

#include <linux/seq_file.h>

#include <linux/highmem.h>

#include <linux/ptrace.h>

#include <linux/pagemap.h>

#include <linux/mempolicy.h>

#include <asm/elf.h>

#include <asm/uaccess.h>

#include <asm/tlbflush.h>

#include "internal.h"

char *task_mem(struct mm_struct *mm, char *buffer)

{

        unsigned long data, text, lib;

        unsigned long hiwater_vm, total_vm, hiwater_rss, total_rss;

        /*

         * Note: to minimize their overhead, mm maintains hiwater_vm and

         * hiwater_rss only when about to *lower* total_vm or rss.  Any

         * collector of these hiwater stats must therefore get total_vm

         * and rss too, which will usually be the higher.  Barriers? not

         * worth the effort, such snapshots can always be inconsistent.

         */

        hiwater_vm = total_vm = mm->total_vm;

        if (hiwater_vm < mm->hiwater_vm)

                hiwater_vm = mm->hiwater_vm;

        hiwater_rss = total_rss = get_mm_rss(mm);

        if (hiwater_rss < mm->hiwater_rss)

                hiwater_rss = mm->hiwater_rss;

        data = mm->total_vm - mm->shared_vm - mm->stack_vm;

        text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK)) >> 10;

        lib = (mm->exec_vm << (PAGE_SHIFT-10)) - text;

        buffer += sprintf(buffer,

                "VmPeak:\t%8lu kB\n"

                "VmSize:\t%8lu kB\n"

                "VmLck:\t%8lu kB\n"

                "VmHWM:\t%8lu kB\n"

                "VmRSS:\t%8lu kB\n"

                "VmData:\t%8lu kB\n"

                "VmStk:\t%8lu kB\n"

                "VmExe:\t%8lu kB\n"

                "VmLib:\t%8lu kB\n"

                "VmPTE:\t%8lu kB\n",

                hiwater_vm << (PAGE_SHIFT-10),

                (total_vm - mm->reserved_vm) << (PAGE_SHIFT-10),

                mm->locked_vm << (PAGE_SHIFT-10),

                hiwater_rss << (PAGE_SHIFT-10),

                total_rss << (PAGE_SHIFT-10),

                data << (PAGE_SHIFT-10),

                mm->stack_vm << (PAGE_SHIFT-10), text, lib,

                (PTRS_PER_PTE*sizeof(pte_t)*mm->nr_ptes) >> 10);

        return buffer;

}

unsigned long task_vsize(struct mm_struct *mm)

{

        return PAGE_SIZE * mm->total_vm;

}

int task_statm(struct mm_struct *mm, int *shared, int *text,

               int *data, int *resident)

{

        *shared = get_mm_counter(mm, file_rss);

        *text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK))

                                                                >> PAGE_SHIFT;

        *data = mm->total_vm - mm->shared_vm;

        *resident = *shared + get_mm_counter(mm, anon_rss);

        return mm->total_vm;

}

int proc_exe_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt)

{

        struct vm_area_struct * vma;

        int result = -ENOENT;

        struct task_struct *task = get_proc_task(inode);

        struct mm_struct * mm = NULL;

        if (task) {

                mm = get_task_mm(task);

                put_task_struct(task);

        }

        if (!mm)

                goto out;

        down_read(&mm->mmap_sem);

        vma = mm->mmap;

        while (vma) {

                if ((vma->vm_flags & VM_EXECUTABLE) && vma->vm_file)

                        break;

                vma = vma->vm_next;

        }

        if (vma) {

                *mnt = mntget(vma->vm_file->f_path.mnt);

                *dentry = dget(vma->vm_file->f_path.dentry);

                result = 0;

        }

        up_read(&mm->mmap_sem);

        mmput(mm);

out:

        return result;

}

static void pad_len_spaces(struct seq_file *m, int len)

{

        len = 25 + sizeof(void*) * 6 - len;

        if (len < 1)

                len = 1;

        seq_printf(m, "%*c", len, ' ');

}

struct mem_size_stats

{

        unsigned long resident;

        unsigned long shared_clean;

        unsigned long shared_dirty;

        unsigned long private_clean;

        unsigned long private_dirty;

        unsigned long referenced;

};

struct pmd_walker {

        struct vm_area_struct *vma;

        void *private;

        void (*action)(struct vm_area_struct *, pmd_t *, unsigned long,

                       unsigned long, void *);

};

static int show_map_internal(struct seq_file *m, void *v, struct mem_size_stats *mss)

{

        struct proc_maps_private *priv = m->private;

        struct task_struct *task = priv->task;

        struct vm_area_struct *vma = v;

        struct mm_struct *mm = vma->vm_mm;

        struct file *file = vma->vm_file;

        int flags = vma->vm_flags;

        unsigned long ino = 0;

        dev_t dev = 0;

        int len;

        if (maps_protect && !ptrace_may_attach(task))

                return -EACCES;

        if (file) {

                struct inode *inode = vma->vm_file->f_path.dentry->d_inode;

                dev = inode->i_sb->s_dev;

                ino = inode->i_ino;

        }

        seq_printf(m, "%08lx-%08lx %c%c%c%c %08lx %02x:%02x %lu %n",

                        vma->vm_start,

                        vma->vm_end,

                        flags & VM_READ ? 'r' : '-',

                        flags & VM_WRITE ? 'w' : '-',

                        flags & VM_EXEC ? 'x' : '-',

                        flags & VM_MAYSHARE ? 's' : 'p',

                        vma->vm_pgoff << PAGE_SHIFT,

                        MAJOR(dev), MINOR(dev), ino, &len);

        /*

         * Print the dentry name for named mappings, and a

         * special [heap] marker for the heap:

         */

        if (file) {

                pad_len_spaces(m, len);

                seq_path(m, file->f_path.mnt, file->f_path.dentry, "\n");

        } else {

                const char *name = arch_vma_name(vma);

                if (!name) {

                        if (mm) {

                                if (vma->vm_start <= mm->start_brk &&

                                                vma->vm_end >= mm->brk) {

                                        name = "[heap]";

                                } else if (vma->vm_start <= mm->start_stack &&

                                           vma->vm_end >= mm->start_stack) {

                                        name = "[stack]";

                                }

                        } else {

                                name = "[vdso]";

                        }

                }

                if (name) {

                        pad_len_spaces(m, len);

                        seq_puts(m, name);

                }

        }

        seq_putc(m, '\n');

        if (mss)

                seq_printf(m,

                           "Size:           %8lu kB\n"

                           "Rss:            %8lu kB\n"

                           "Shared_Clean:   %8lu kB\n"

                           "Shared_Dirty:   %8lu kB\n"

                           "Private_Clean:  %8lu kB\n"

                           "Private_Dirty:  %8lu kB\n"

                           "Referenced:     %8lu kB\n",

                           (vma->vm_end - vma->vm_start) >> 10,

                           mss->resident >> 10,

                           mss->shared_clean  >> 10,

                           mss->shared_dirty  >> 10,

                           mss->private_clean >> 10,

                           mss->private_dirty >> 10,

                           mss->referenced >> 10);

        if (m->count < m->size)  /* vma is copied successfully */

                m->version = (vma != get_gate_vma(task))? vma->vm_start: 0;

        return 0;

}

static int show_map(struct seq_file *m, void *v)

{

        return show_map_internal(m, v, NULL);

}

static void smaps_pte_range(struct vm_area_struct *vma, pmd_t *pmd,

                            unsigned long addr, unsigned long end,

                            void *private)

{

        struct mem_size_stats *mss = private;

        pte_t *pte, ptent;

        spinlock_t *ptl;

        struct page *page;

        pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);

        for (; addr != end; pte++, addr += PAGE_SIZE) {

                ptent = *pte;

                if (!pte_present(ptent))

                        continue;

                mss->resident += PAGE_SIZE;

                page = vm_normal_page(vma, addr, ptent);

                if (!page)

                        continue;

                /* Accumulate the size in pages that have been accessed. */

                if (pte_young(ptent) || PageReferenced(page))

                        mss->referenced += PAGE_SIZE;

                if (page_mapcount(page) >= 2) {

                        if (pte_dirty(ptent))

                                mss->shared_dirty += PAGE_SIZE;

                        else

                                mss->shared_clean += PAGE_SIZE;

                } else {

                        if (pte_dirty(ptent))

                                mss->private_dirty += PAGE_SIZE;

                        else

                                mss->private_clean += PAGE_SIZE;

                }

        }

        pte_unmap_unlock(pte - 1, ptl);

        cond_resched();

}

static void clear_refs_pte_range(struct vm_area_struct *vma, pmd_t *pmd,

                                 unsigned long addr, unsigned long end,

                                 void *private)

{

        pte_t *pte, ptent;

        spinlock_t *ptl;

        struct page *page;

        pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);

        for (; addr != end; pte++, addr += PAGE_SIZE) {

                ptent = *pte;

                if (!pte_present(ptent))

                        continue;

                page = vm_normal_page(vma, addr, ptent);

                if (!page)

                        continue;

                /* Clear accessed and referenced bits. */

                ptep_test_and_clear_young(vma, addr, pte);

                ClearPageReferenced(page);

        }

        pte_unmap_unlock(pte - 1, ptl);

        cond_resched();

}

static inline void walk_pmd_range(struct pmd_walker *walker, pud_t *pud,

                                  unsigned long addr, unsigned long end)

{

        pmd_t *pmd;

        unsigned long next;

        for (pmd = pmd_offset(pud, addr); addr != end;

             pmd++, addr = next) {

                next = pmd_addr_end(addr, end);

                if (pmd_none_or_clear_bad(pmd))

                        continue;

                walker->action(walker->vma, pmd, addr, next, walker->private);

        }

}

static inline void walk_pud_range(struct pmd_walker *walker, pgd_t *pgd,

                                  unsigned long addr, unsigned long end)

{

        pud_t *pud;

        unsigned long next;

        for (pud = pud_offset(pgd, addr); addr != end;

             pud++, addr = next) {

                next = pud_addr_end(addr, end);

                if (pud_none_or_clear_bad(pud))

                        continue;

                walk_pmd_range(walker, pud, addr, next);

        }

}

/*

 * walk_page_range - walk the page tables of a VMA with a callback

 * @vma - VMA to walk

 * @action - callback invoked for every bottom-level (PTE) page table

 * @private - private data passed to the callback function

 *

 * Recursively walk the page table for the memory area in a VMA, calling

 * a callback for every bottom-level (PTE) page table.

 */

static inline void walk_page_range(struct vm_area_struct *vma,

                                   void (*action)(struct vm_area_struct *,

                                                  pmd_t *, unsigned long,

                                                  unsigned long, void *),

                                   void *private)

{

        unsigned long addr = vma->vm_start;

        unsigned long end = vma->vm_end;

        struct pmd_walker walker = {

                .vma            = vma,

                .private        = private,

                .action         = action,

        };

        pgd_t *pgd;

        unsigned long next;

        for (pgd = pgd_offset(vma->vm_mm, addr); addr != end;

             pgd++, addr = next) {

                next = pgd_addr_end(addr, end);

                if (pgd_none_or_clear_bad(pgd))

                        continue;

                walk_pud_range(&walker, pgd, addr, next);

        }

}

static int show_smap(struct seq_file *m, void *v)

{

        struct vm_area_struct *vma = v;

        struct mem_size_stats mss;

        memset(&mss, 0, sizeof mss);

        if (vma->vm_mm && !is_vm_hugetlb_page(vma))

                walk_page_range(vma, smaps_pte_range, &mss);

        return show_map_internal(m, v, &mss);

}

void clear_refs_smap(struct mm_struct *mm)

{

        struct vm_area_struct *vma;

        down_read(&mm->mmap_sem);

        for (vma = mm->mmap; vma; vma = vma->vm_next)

                if (vma->vm_mm && !is_vm_hugetlb_page(vma))

                        walk_page_range(vma, clear_refs_pte_range, NULL);

        flush_tlb_mm(mm);

        up_read(&mm->mmap_sem);

}

static void *m_start(struct seq_file *m, loff_t *pos)

{

        struct proc_maps_private *priv = m->private;

        unsigned long last_addr = m->version;

        struct mm_struct *mm;

        struct vm_area_struct *vma, *tail_vma = NULL;

        loff_t l = *pos;

        /* Clear the per syscall fields in priv */

        priv->task = NULL;

        priv->tail_vma = NULL;

        /*

         * We remember last_addr rather than next_addr to hit with

         * mmap_cache most of the time. We have zero last_addr at

         * the beginning and also after lseek. We will have -1 last_addr

         * after the end of the vmas.

         */

        if (last_addr == -1UL)

                return NULL;

        priv->task = get_pid_task(priv->pid, PIDTYPE_PID);

        if (!priv->task)

                return NULL;

        mm = mm_for_maps(priv->task);

        if (!mm)

                return NULL;

        priv->tail_vma = tail_vma = get_gate_vma(priv->task);

        /* Start with last addr hint */

        if (last_addr && (vma = find_vma(mm, last_addr))) {

                vma = vma->vm_next;

                goto out;

        }

        /*

         * Check the vma index is within the range and do

         * sequential scan until m_index.

         */

        vma = NULL;

        if ((unsigned long)l < mm->map_count) {

                vma = mm->mmap;

                while (l-- && vma)

                        vma = vma->vm_next;

                goto out;

        }

        if (l != mm->map_count)

                tail_vma = NULL; /* After gate vma */

out:

        if (vma)

                return vma;

        /* End of vmas has been reached */

        m->version = (tail_vma != NULL)? 0: -1UL;

        up_read(&mm->mmap_sem);

        mmput(mm);

        return tail_vma;

}

static void vma_stop(struct proc_maps_private *priv, struct vm_area_struct *vma)

{

        if (vma && vma != priv->tail_vma) {

                struct mm_struct *mm = vma->vm_mm;

                up_read(&mm->mmap_sem);

                mmput(mm);

        }

}

static void *m_next(struct seq_file *m, void *v, loff_t *pos)

{

        struct proc_maps_private *priv = m->private;

        struct vm_area_struct *vma = v;

        struct vm_area_struct *tail_vma = priv->tail_vma;

        (*pos)++;

        if (vma && (vma != tail_vma) && vma->vm_next)

                return vma->vm_next;

        vma_stop(priv, vma);

        return (vma != tail_vma)? tail_vma: NULL;

}

static void m_stop(struct seq_file *m, void *v)

{

        struct proc_maps_private *priv = m->private;

        struct vm_area_struct *vma = v;

        vma_stop(priv, vma);

        if (priv->task)

                put_task_struct(priv->task);

}

static struct seq_operations proc_pid_maps_op = {

        .start  = m_start,

        .next   = m_next,

        .stop   = m_stop,

        .show   = show_map

};

static struct seq_operations proc_pid_smaps_op = {

        .start  = m_start,

        .next   = m_next,

        .stop   = m_stop,

        .show   = show_smap

};

static int do_maps_open(struct inode *inode, struct file *file,

                        struct seq_operations *ops)

{

        struct proc_maps_private *priv;

        int ret = -ENOMEM;

        priv = kzalloc(sizeof(*priv), GFP_KERNEL);

        if (priv) {

                priv->pid = proc_pid(inode);

                ret = seq_open(file, ops);

                if (!ret) {

                        struct seq_file *m = file->private_data;

                        m->private = priv;

                } else {

                        kfree(priv);

                }

        }

        return ret;

}

static int maps_open(struct inode *inode, struct file *file)

{

        return do_maps_open(inode, file, &proc_pid_maps_op);

}

const struct file_operations proc_maps_operations = {

        .open           = maps_open,

        .read           = seq_read,

        .llseek         = seq_lseek,

        .release        = seq_release_private,

};

#ifdef CONFIG_NUMA

extern int show_numa_map(struct seq_file *m, void *v);

static int show_numa_map_checked(struct seq_file *m, void *v)

{

        struct proc_maps_private *priv = m->private;

        struct task_struct *task = priv->task;

        if (maps_protect && !ptrace_may_attach(task))

                return -EACCES;

        return show_numa_map(m, v);

}

static struct seq_operations proc_pid_numa_maps_op = {

        .start  = m_start,

        .next   = m_next,

        .stop   = m_stop,

        .show   = show_numa_map_checked

};

static int numa_maps_open(struct inode *inode, struct file *file)

{

        return do_maps_open(inode, file, &proc_pid_numa_maps_op);

}

const struct file_operations proc_numa_maps_operations = {

        .open           = numa_maps_open,

        .read           = seq_read,

        .llseek         = seq_lseek,

        .release        = seq_release_private,

};

#endif

static int smaps_open(struct inode *inode, struct file *file)

{

        return do_maps_open(inode, file, &proc_pid_smaps_op);

}

const struct file_operations proc_smaps_operations = {

        .open           = smaps_open,

        .read           = seq_read,

        .llseek         = seq_lseek,

        .release        = seq_release_private,

};