// SPDX-License-Identifier: GPL-2.0-only /* * omap iommu: debugfs interface * * Copyright (C) 2008-2009 Nokia Corporation * * Written by Hiroshi DOYU <Hiroshi.DOYU@nokia.com> */ #include <linux/err.h> #include <linux/io.h> #include <linux/slab.h> #include <linux/uaccess.h> #include <linux/pm_runtime.h> #include <linux/debugfs.h> #include <linux/platform_data/iommu-omap.h> #include "omap-iopgtable.h" #include "omap-iommu.h" static DEFINE_MUTEX(iommu_debug_lock); static struct dentry *iommu_debug_root; static inline bool is_omap_iommu_detached(struct omap_iommu *obj) { return !obj->domain; } #define pr_reg(name) \ do { \ ssize_t bytes; \ const char *str = "%20s: %08x\n"; \ const int maxcol = 32; \ bytes = snprintf(p, maxcol, str, __stringify(name), \ iommu_read_reg(obj, MMU_##name)); \ p += bytes; \ len -= bytes; \ if (len < maxcol) \ goto out; \ } while (0) static ssize_t omap2_iommu_dump_ctx(struct omap_iommu *obj, char *buf, ssize_t len) { char *p = buf; pr_reg(REVISION); pr_reg(IRQSTATUS); pr_reg(IRQENABLE); pr_reg(WALKING_ST); pr_reg(CNTL); pr_reg(FAULT_AD); pr_reg(TTB); pr_reg(LOCK); pr_reg(LD_TLB); pr_reg(CAM); pr_reg(RAM); pr_reg(GFLUSH); pr_reg(FLUSH_ENTRY); pr_reg(READ_CAM); pr_reg(READ_RAM); pr_reg(EMU_FAULT_AD); out: return p - buf; } static ssize_t omap_iommu_dump_ctx(struct omap_iommu *obj, char *buf, ssize_t bytes) { if (!obj || !buf) return -EINVAL; pm_runtime_get_sync(obj->dev); bytes = omap2_iommu_dump_ctx(obj, buf, bytes); pm_runtime_put_sync(obj->dev); return bytes; } static ssize_t debug_read_regs(struct file *file, char __user *userbuf, size_t count, loff_t *ppos) { struct omap_iommu *obj = file->private_data; char *p, *buf; ssize_t bytes; if (is_omap_iommu_detached(obj)) return -EPERM; buf = kmalloc(count, GFP_KERNEL); if (!buf) return -ENOMEM; p = buf; mutex_lock(&iommu_debug_lock); bytes = omap_iommu_dump_ctx(obj, p, count); if (bytes < 0) goto err; bytes = simple_read_from_buffer(userbuf, count, ppos, buf, bytes); err: mutex_unlock(&iommu_debug_lock); kfree(buf); return bytes; } static int __dump_tlb_entries(struct omap_iommu *obj, struct cr_regs *crs, int num) { int i; struct iotlb_lock saved; struct cr_regs tmp; struct cr_regs *p = crs; pm_runtime_get_sync(obj->dev); iotlb_lock_get(obj, &saved); for_each_iotlb_cr(obj, num, i, tmp) { if (!iotlb_cr_valid(&tmp)) continue; *p++ = tmp; } iotlb_lock_set(obj, &saved); pm_runtime_put_sync(obj->dev); return p - crs; } static ssize_t iotlb_dump_cr(struct omap_iommu *obj, struct cr_regs *cr, struct seq_file *s) { seq_printf(s, "%08x %08x %01x\n", cr->cam, cr->ram, (cr->cam & MMU_CAM_P) ? 1 : 0); return 0; } static size_t omap_dump_tlb_entries(struct omap_iommu *obj, struct seq_file *s) { int i, num; struct cr_regs *cr; num = obj->nr_tlb_entries; cr = kcalloc(num, sizeof(*cr), GFP_KERNEL); if (!cr) return 0; num = __dump_tlb_entries(obj, cr, num); for (i = 0; i < num; i++) iotlb_dump_cr(obj, cr + i, s); kfree(cr); return 0; } static int tlb_show(struct seq_file *s, void *data) { struct omap_iommu *obj = s->private; if (is_omap_iommu_detached(obj)) return -EPERM; mutex_lock(&iommu_debug_lock); seq_printf(s, "%8s %8s\n", "cam:", "ram:"); seq_puts(s, "-----------------------------------------\n"); omap_dump_tlb_entries(obj, s); mutex_unlock(&iommu_debug_lock); return 0; } static void dump_ioptable(struct seq_file *s) { int i, j; u32 da; u32 *iopgd, *iopte; struct omap_iommu *obj = s->private; spin_lock(&obj->page_table_lock); iopgd = iopgd_offset(obj, 0); for (i = 0; i < PTRS_PER_IOPGD; i++, iopgd++) { if (!*iopgd) continue; if (!(*iopgd & IOPGD_TABLE)) { da = i << IOPGD_SHIFT; seq_printf(s, "1: 0x%08x 0x%08x\n", da, *iopgd); continue; } iopte = iopte_offset(iopgd, 0); for (j = 0; j < PTRS_PER_IOPTE; j++, iopte++) { if (!*iopte) continue; da = (i << IOPGD_SHIFT) + (j << IOPTE_SHIFT); seq_printf(s, "2: 0x%08x 0x%08x\n", da, *iopte); } } spin_unlock(&obj->page_table_lock); } static int pagetable_show(struct seq_file *s, void *data) { struct omap_iommu *obj = s->private; if (is_omap_iommu_detached(obj)) return -EPERM; mutex_lock(&iommu_debug_lock); seq_printf(s, "L: %8s %8s\n", "da:", "pte:"); seq_puts(s, "--------------------------\n"); dump_ioptable(s); mutex_unlock(&iommu_debug_lock); return 0; } #define DEBUG_FOPS_RO(name) \ static const struct file_operations name##_fops = { \ .open = simple_open, \ .read = debug_read_##name, \ .llseek = generic_file_llseek, \ } DEBUG_FOPS_RO(regs); DEFINE_SHOW_ATTRIBUTE(tlb); DEFINE_SHOW_ATTRIBUTE(pagetable); void omap_iommu_debugfs_add(struct omap_iommu *obj) { struct dentry *d; if (!iommu_debug_root) return; d = debugfs_create_dir(obj->name, iommu_debug_root); obj->debug_dir = d; debugfs_create_u32("nr_tlb_entries", 0400, d, &obj->nr_tlb_entries); debugfs_create_file("regs", 0400, d, obj, ®s_fops); debugfs_create_file("tlb", 0400, d, obj, &tlb_fops); debugfs_create_file("pagetable", 0400, d, obj, &pagetable_fops); } void omap_iommu_debugfs_remove(struct omap_iommu *obj) { if (!obj->debug_dir) return; debugfs_remove_recursive(obj->debug_dir); } void __init omap_iommu_debugfs_init(void) { iommu_debug_root = debugfs_create_dir("omap_iommu", NULL); } void __exit omap_iommu_debugfs_exit(void) { debugfs_remove(iommu_debug_root); }