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![Colin Ian King](/assets/img/avatar_default.png)
It is possible for the call to omap_iommu_dump_ctx to return
a negative error number, so check for the failure and return
the error number rather than pass the negative value to
simple_read_from_buffer.
Fixes: 14e0e6796a
("OMAP: iommu: add initial debugfs support")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Link: https://lore.kernel.org/r/20200714192211.744776-1-colin.king@canonical.com
Addresses-Coverity: ("Improper use of negative value")
Signed-off-by: Joerg Roedel <jroedel@suse.de>
274 lines
5.4 KiB
C
274 lines
5.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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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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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/slab.h>
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#include <linux/uaccess.h>
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#include <linux/pm_runtime.h>
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#include <linux/debugfs.h>
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#include <linux/platform_data/iommu-omap.h>
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#include "omap-iopgtable.h"
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#include "omap-iommu.h"
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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 inline bool is_omap_iommu_detached(struct omap_iommu *obj)
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{
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return !obj->domain;
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}
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#define pr_reg(name) \
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do { \
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ssize_t bytes; \
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const char *str = "%20s: %08x\n"; \
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const int maxcol = 32; \
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bytes = snprintf(p, maxcol, str, __stringify(name), \
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iommu_read_reg(obj, MMU_##name)); \
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p += bytes; \
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len -= bytes; \
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if (len < maxcol) \
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goto out; \
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} while (0)
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static ssize_t
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omap2_iommu_dump_ctx(struct omap_iommu *obj, char *buf, ssize_t len)
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{
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char *p = buf;
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pr_reg(REVISION);
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pr_reg(IRQSTATUS);
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pr_reg(IRQENABLE);
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pr_reg(WALKING_ST);
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pr_reg(CNTL);
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pr_reg(FAULT_AD);
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pr_reg(TTB);
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pr_reg(LOCK);
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pr_reg(LD_TLB);
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pr_reg(CAM);
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pr_reg(RAM);
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pr_reg(GFLUSH);
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pr_reg(FLUSH_ENTRY);
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pr_reg(READ_CAM);
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pr_reg(READ_RAM);
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pr_reg(EMU_FAULT_AD);
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out:
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return p - buf;
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}
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static ssize_t omap_iommu_dump_ctx(struct omap_iommu *obj, char *buf,
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ssize_t bytes)
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{
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if (!obj || !buf)
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return -EINVAL;
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pm_runtime_get_sync(obj->dev);
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bytes = omap2_iommu_dump_ctx(obj, buf, bytes);
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pm_runtime_put_sync(obj->dev);
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return bytes;
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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 omap_iommu *obj = file->private_data;
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char *p, *buf;
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ssize_t bytes;
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if (is_omap_iommu_detached(obj))
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return -EPERM;
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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 = omap_iommu_dump_ctx(obj, p, count);
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if (bytes < 0)
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goto err;
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bytes = simple_read_from_buffer(userbuf, count, ppos, buf, bytes);
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err:
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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 int
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__dump_tlb_entries(struct omap_iommu *obj, struct cr_regs *crs, int num)
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{
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int i;
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struct iotlb_lock saved;
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struct cr_regs tmp;
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struct cr_regs *p = crs;
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pm_runtime_get_sync(obj->dev);
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iotlb_lock_get(obj, &saved);
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for_each_iotlb_cr(obj, num, i, tmp) {
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if (!iotlb_cr_valid(&tmp))
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continue;
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*p++ = tmp;
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}
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iotlb_lock_set(obj, &saved);
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pm_runtime_put_sync(obj->dev);
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return p - crs;
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}
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static ssize_t iotlb_dump_cr(struct omap_iommu *obj, struct cr_regs *cr,
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struct seq_file *s)
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{
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seq_printf(s, "%08x %08x %01x\n", cr->cam, cr->ram,
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(cr->cam & MMU_CAM_P) ? 1 : 0);
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return 0;
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}
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static size_t omap_dump_tlb_entries(struct omap_iommu *obj, struct seq_file *s)
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{
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int i, num;
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struct cr_regs *cr;
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num = obj->nr_tlb_entries;
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cr = kcalloc(num, sizeof(*cr), GFP_KERNEL);
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if (!cr)
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return 0;
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num = __dump_tlb_entries(obj, cr, num);
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for (i = 0; i < num; i++)
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iotlb_dump_cr(obj, cr + i, s);
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kfree(cr);
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return 0;
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}
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static int tlb_show(struct seq_file *s, void *data)
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{
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struct omap_iommu *obj = s->private;
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if (is_omap_iommu_detached(obj))
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return -EPERM;
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mutex_lock(&iommu_debug_lock);
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seq_printf(s, "%8s %8s\n", "cam:", "ram:");
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seq_puts(s, "-----------------------------------------\n");
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omap_dump_tlb_entries(obj, s);
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mutex_unlock(&iommu_debug_lock);
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return 0;
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}
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static void dump_ioptable(struct seq_file *s)
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{
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int i, j;
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u32 da;
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u32 *iopgd, *iopte;
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struct omap_iommu *obj = s->private;
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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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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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seq_printf(s, "1: 0x%08x 0x%08x\n", da, *iopgd);
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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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seq_printf(s, "2: 0x%08x 0x%08x\n", da, *iopte);
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}
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}
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spin_unlock(&obj->page_table_lock);
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}
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static int pagetable_show(struct seq_file *s, void *data)
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{
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struct omap_iommu *obj = s->private;
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if (is_omap_iommu_detached(obj))
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return -EPERM;
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mutex_lock(&iommu_debug_lock);
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seq_printf(s, "L: %8s %8s\n", "da:", "pte:");
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seq_puts(s, "--------------------------\n");
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dump_ioptable(s);
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mutex_unlock(&iommu_debug_lock);
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return 0;
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}
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#define DEBUG_FOPS_RO(name) \
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static const struct file_operations name##_fops = { \
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.open = simple_open, \
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.read = debug_read_##name, \
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.llseek = generic_file_llseek, \
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}
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DEBUG_FOPS_RO(regs);
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DEFINE_SHOW_ATTRIBUTE(tlb);
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DEFINE_SHOW_ATTRIBUTE(pagetable);
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void omap_iommu_debugfs_add(struct omap_iommu *obj)
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{
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struct dentry *d;
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if (!iommu_debug_root)
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return;
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d = debugfs_create_dir(obj->name, iommu_debug_root);
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obj->debug_dir = d;
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debugfs_create_u32("nr_tlb_entries", 0400, d, &obj->nr_tlb_entries);
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debugfs_create_file("regs", 0400, d, obj, ®s_fops);
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debugfs_create_file("tlb", 0400, d, obj, &tlb_fops);
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debugfs_create_file("pagetable", 0400, d, obj, &pagetable_fops);
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}
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void omap_iommu_debugfs_remove(struct omap_iommu *obj)
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{
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if (!obj->debug_dir)
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return;
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debugfs_remove_recursive(obj->debug_dir);
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}
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void __init omap_iommu_debugfs_init(void)
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{
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iommu_debug_root = debugfs_create_dir("omap_iommu", NULL);
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}
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void __exit omap_iommu_debugfs_exit(void)
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{
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debugfs_remove(iommu_debug_root);
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}
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