416 lines
8.9 KiB
C
416 lines
8.9 KiB
C
/*
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* omap iommu: debugfs interface
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*
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* Copyright (C) 2008-2009 Nokia Corporation
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*
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* Written by Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/err.h>
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#include <linux/clk.h>
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#include <linux/io.h>
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#include <linux/uaccess.h>
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#include <linux/platform_device.h>
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#include <linux/debugfs.h>
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#include <plat/iommu.h>
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#include <plat/iovmm.h>
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#include "iopgtable.h"
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#define MAXCOLUMN 100 /* for short messages */
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static DEFINE_MUTEX(iommu_debug_lock);
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static struct dentry *iommu_debug_root;
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static ssize_t debug_read_ver(struct file *file, char __user *userbuf,
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size_t count, loff_t *ppos)
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{
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u32 ver = iommu_arch_version();
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char buf[MAXCOLUMN], *p = buf;
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p += sprintf(p, "H/W version: %d.%d\n", (ver >> 4) & 0xf , ver & 0xf);
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return simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
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}
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static ssize_t debug_read_regs(struct file *file, char __user *userbuf,
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size_t count, loff_t *ppos)
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{
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struct iommu *obj = file->private_data;
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char *p, *buf;
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ssize_t bytes;
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buf = kmalloc(count, GFP_KERNEL);
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if (!buf)
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return -ENOMEM;
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p = buf;
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mutex_lock(&iommu_debug_lock);
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bytes = iommu_dump_ctx(obj, p, count);
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bytes = simple_read_from_buffer(userbuf, count, ppos, buf, bytes);
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mutex_unlock(&iommu_debug_lock);
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kfree(buf);
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return bytes;
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}
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static ssize_t debug_read_tlb(struct file *file, char __user *userbuf,
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size_t count, loff_t *ppos)
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{
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struct iommu *obj = file->private_data;
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char *p, *buf;
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ssize_t bytes, rest;
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buf = kmalloc(count, GFP_KERNEL);
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if (!buf)
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return -ENOMEM;
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p = buf;
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mutex_lock(&iommu_debug_lock);
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p += sprintf(p, "%8s %8s\n", "cam:", "ram:");
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p += sprintf(p, "-----------------------------------------\n");
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rest = count - (p - buf);
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p += dump_tlb_entries(obj, p, rest);
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bytes = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
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mutex_unlock(&iommu_debug_lock);
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kfree(buf);
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return bytes;
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}
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static ssize_t debug_write_pagetable(struct file *file,
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const char __user *userbuf, size_t count, loff_t *ppos)
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{
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struct iotlb_entry e;
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struct cr_regs cr;
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int err;
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struct iommu *obj = file->private_data;
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char buf[MAXCOLUMN], *p = buf;
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count = min(count, sizeof(buf));
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mutex_lock(&iommu_debug_lock);
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if (copy_from_user(p, userbuf, count)) {
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mutex_unlock(&iommu_debug_lock);
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return -EFAULT;
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}
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sscanf(p, "%x %x", &cr.cam, &cr.ram);
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if (!cr.cam || !cr.ram) {
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mutex_unlock(&iommu_debug_lock);
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return -EINVAL;
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}
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iotlb_cr_to_e(&cr, &e);
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err = iopgtable_store_entry(obj, &e);
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if (err)
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dev_err(obj->dev, "%s: fail to store cr\n", __func__);
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mutex_unlock(&iommu_debug_lock);
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return count;
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}
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#define dump_ioptable_entry_one(lv, da, val) \
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({ \
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int __err = 0; \
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ssize_t bytes; \
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const int maxcol = 22; \
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const char *str = "%d: %08x %08x\n"; \
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bytes = snprintf(p, maxcol, str, lv, da, val); \
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p += bytes; \
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len -= bytes; \
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if (len < maxcol) \
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__err = -ENOMEM; \
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__err; \
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})
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static ssize_t dump_ioptable(struct iommu *obj, char *buf, ssize_t len)
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{
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int i;
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u32 *iopgd;
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char *p = buf;
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spin_lock(&obj->page_table_lock);
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iopgd = iopgd_offset(obj, 0);
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for (i = 0; i < PTRS_PER_IOPGD; i++, iopgd++) {
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int j, err;
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u32 *iopte;
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u32 da;
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if (!*iopgd)
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continue;
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if (!(*iopgd & IOPGD_TABLE)) {
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da = i << IOPGD_SHIFT;
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err = dump_ioptable_entry_one(1, da, *iopgd);
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if (err)
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goto out;
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continue;
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}
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iopte = iopte_offset(iopgd, 0);
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for (j = 0; j < PTRS_PER_IOPTE; j++, iopte++) {
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if (!*iopte)
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continue;
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da = (i << IOPGD_SHIFT) + (j << IOPTE_SHIFT);
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err = dump_ioptable_entry_one(2, da, *iopgd);
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if (err)
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goto out;
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}
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}
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out:
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spin_unlock(&obj->page_table_lock);
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return p - buf;
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}
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static ssize_t debug_read_pagetable(struct file *file, char __user *userbuf,
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size_t count, loff_t *ppos)
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{
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struct iommu *obj = file->private_data;
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char *p, *buf;
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size_t bytes;
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buf = (char *)__get_free_page(GFP_KERNEL);
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if (!buf)
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return -ENOMEM;
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p = buf;
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p += sprintf(p, "L: %8s %8s\n", "da:", "pa:");
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p += sprintf(p, "-----------------------------------------\n");
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mutex_lock(&iommu_debug_lock);
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bytes = PAGE_SIZE - (p - buf);
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p += dump_ioptable(obj, p, bytes);
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bytes = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
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mutex_unlock(&iommu_debug_lock);
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free_page((unsigned long)buf);
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return bytes;
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}
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static ssize_t debug_read_mmap(struct file *file, char __user *userbuf,
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size_t count, loff_t *ppos)
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{
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struct iommu *obj = file->private_data;
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char *p, *buf;
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struct iovm_struct *tmp;
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int uninitialized_var(i);
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ssize_t bytes;
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buf = (char *)__get_free_page(GFP_KERNEL);
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if (!buf)
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return -ENOMEM;
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p = buf;
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p += sprintf(p, "%-3s %-8s %-8s %6s %8s\n",
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"No", "start", "end", "size", "flags");
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p += sprintf(p, "-------------------------------------------------\n");
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mutex_lock(&iommu_debug_lock);
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list_for_each_entry(tmp, &obj->mmap, list) {
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size_t len;
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const char *str = "%3d %08x-%08x %6x %8x\n";
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const int maxcol = 39;
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len = tmp->da_end - tmp->da_start;
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p += snprintf(p, maxcol, str,
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i, tmp->da_start, tmp->da_end, len, tmp->flags);
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if (PAGE_SIZE - (p - buf) < maxcol)
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break;
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i++;
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}
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bytes = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
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mutex_unlock(&iommu_debug_lock);
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free_page((unsigned long)buf);
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return bytes;
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}
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static ssize_t debug_read_mem(struct file *file, char __user *userbuf,
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size_t count, loff_t *ppos)
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{
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struct iommu *obj = file->private_data;
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char *p, *buf;
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struct iovm_struct *area;
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ssize_t bytes;
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count = min_t(ssize_t, count, PAGE_SIZE);
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buf = (char *)__get_free_page(GFP_KERNEL);
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if (!buf)
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return -ENOMEM;
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p = buf;
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mutex_lock(&iommu_debug_lock);
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area = find_iovm_area(obj, (u32)ppos);
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if (IS_ERR(area)) {
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bytes = -EINVAL;
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goto err_out;
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}
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memcpy(p, area->va, count);
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p += count;
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bytes = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
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err_out:
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mutex_unlock(&iommu_debug_lock);
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free_page((unsigned long)buf);
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return bytes;
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}
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static ssize_t debug_write_mem(struct file *file, const char __user *userbuf,
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size_t count, loff_t *ppos)
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{
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struct iommu *obj = file->private_data;
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struct iovm_struct *area;
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char *p, *buf;
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count = min_t(size_t, count, PAGE_SIZE);
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buf = (char *)__get_free_page(GFP_KERNEL);
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if (!buf)
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return -ENOMEM;
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p = buf;
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mutex_lock(&iommu_debug_lock);
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if (copy_from_user(p, userbuf, count)) {
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count = -EFAULT;
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goto err_out;
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}
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area = find_iovm_area(obj, (u32)ppos);
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if (IS_ERR(area)) {
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count = -EINVAL;
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goto err_out;
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}
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memcpy(area->va, p, count);
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err_out:
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mutex_unlock(&iommu_debug_lock);
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free_page((unsigned long)buf);
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return count;
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}
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static int debug_open_generic(struct inode *inode, struct file *file)
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{
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file->private_data = inode->i_private;
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return 0;
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}
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#define DEBUG_FOPS(name) \
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static const struct file_operations debug_##name##_fops = { \
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.open = debug_open_generic, \
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.read = debug_read_##name, \
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.write = debug_write_##name, \
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};
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#define DEBUG_FOPS_RO(name) \
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static const struct file_operations debug_##name##_fops = { \
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.open = debug_open_generic, \
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.read = debug_read_##name, \
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};
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DEBUG_FOPS_RO(ver);
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DEBUG_FOPS_RO(regs);
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DEBUG_FOPS_RO(tlb);
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DEBUG_FOPS(pagetable);
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DEBUG_FOPS_RO(mmap);
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DEBUG_FOPS(mem);
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#define __DEBUG_ADD_FILE(attr, mode) \
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{ \
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struct dentry *dent; \
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dent = debugfs_create_file(#attr, mode, parent, \
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obj, &debug_##attr##_fops); \
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if (!dent) \
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return -ENOMEM; \
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}
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#define DEBUG_ADD_FILE(name) __DEBUG_ADD_FILE(name, 600)
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#define DEBUG_ADD_FILE_RO(name) __DEBUG_ADD_FILE(name, 400)
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static int iommu_debug_register(struct device *dev, void *data)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct iommu *obj = platform_get_drvdata(pdev);
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struct dentry *d, *parent;
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if (!obj || !obj->dev)
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return -EINVAL;
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d = debugfs_create_dir(obj->name, iommu_debug_root);
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if (!d)
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return -ENOMEM;
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parent = d;
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d = debugfs_create_u8("nr_tlb_entries", 400, parent,
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(u8 *)&obj->nr_tlb_entries);
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if (!d)
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return -ENOMEM;
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DEBUG_ADD_FILE_RO(ver);
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DEBUG_ADD_FILE_RO(regs);
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DEBUG_ADD_FILE_RO(tlb);
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DEBUG_ADD_FILE(pagetable);
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DEBUG_ADD_FILE_RO(mmap);
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DEBUG_ADD_FILE(mem);
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return 0;
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}
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static int __init iommu_debug_init(void)
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{
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struct dentry *d;
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int err;
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d = debugfs_create_dir("iommu", NULL);
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if (!d)
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return -ENOMEM;
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iommu_debug_root = d;
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err = foreach_iommu_device(d, iommu_debug_register);
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if (err)
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goto err_out;
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return 0;
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err_out:
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debugfs_remove_recursive(iommu_debug_root);
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return err;
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}
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module_init(iommu_debug_init)
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static void __exit iommu_debugfs_exit(void)
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{
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debugfs_remove_recursive(iommu_debug_root);
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}
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module_exit(iommu_debugfs_exit)
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MODULE_DESCRIPTION("omap iommu: debugfs interface");
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MODULE_AUTHOR("Hiroshi DOYU <Hiroshi.DOYU@nokia.com>");
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MODULE_LICENSE("GPL v2");
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