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lib/dma-debug.c
31.9 KB
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/* * Copyright (C) 2008 Advanced Micro Devices, Inc. * * Author: Joerg Roedel <joerg.roedel@amd.com> * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 as published * by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ |
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#include <linux/scatterlist.h> |
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#include <linux/dma-mapping.h> |
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#include <linux/stacktrace.h> |
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#include <linux/dma-debug.h> |
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#include <linux/spinlock.h> |
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#include <linux/debugfs.h> |
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#include <linux/uaccess.h> |
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#include <linux/device.h> |
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#include <linux/types.h> |
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#include <linux/sched.h> |
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#include <linux/ctype.h> |
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#include <linux/list.h> |
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#include <linux/slab.h> |
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|
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#include <asm/sections.h> |
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#define HASH_SIZE 1024ULL #define HASH_FN_SHIFT 13 #define HASH_FN_MASK (HASH_SIZE - 1) |
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enum { dma_debug_single, dma_debug_page, dma_debug_sg, dma_debug_coherent, }; |
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#define DMA_DEBUG_STACKTRACE_ENTRIES 5 |
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struct dma_debug_entry { struct list_head list; struct device *dev; int type; phys_addr_t paddr; u64 dev_addr; u64 size; int direction; int sg_call_ents; int sg_mapped_ents; |
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#ifdef CONFIG_STACKTRACE struct stack_trace stacktrace; unsigned long st_entries[DMA_DEBUG_STACKTRACE_ENTRIES]; #endif |
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}; |
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struct hash_bucket { struct list_head list; spinlock_t lock; |
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} ____cacheline_aligned_in_smp; |
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/* Hash list to save the allocated dma addresses */ static struct hash_bucket dma_entry_hash[HASH_SIZE]; |
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/* List of pre-allocated dma_debug_entry's */ static LIST_HEAD(free_entries); /* Lock for the list above */ static DEFINE_SPINLOCK(free_entries_lock); /* Global disable flag - will be set in case of an error */ static bool global_disable __read_mostly; |
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/* Global error count */ static u32 error_count; /* Global error show enable*/ static u32 show_all_errors __read_mostly; /* Number of errors to show */ static u32 show_num_errors = 1; |
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static u32 num_free_entries; static u32 min_free_entries; |
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static u32 nr_total_entries; |
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|
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/* number of preallocated entries requested by kernel cmdline */ static u32 req_entries; |
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/* debugfs dentry's for the stuff above */ static struct dentry *dma_debug_dent __read_mostly; static struct dentry *global_disable_dent __read_mostly; static struct dentry *error_count_dent __read_mostly; static struct dentry *show_all_errors_dent __read_mostly; static struct dentry *show_num_errors_dent __read_mostly; static struct dentry *num_free_entries_dent __read_mostly; static struct dentry *min_free_entries_dent __read_mostly; |
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static struct dentry *filter_dent __read_mostly; |
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/* per-driver filter related state */ #define NAME_MAX_LEN 64 static char current_driver_name[NAME_MAX_LEN] __read_mostly; static struct device_driver *current_driver __read_mostly; static DEFINE_RWLOCK(driver_name_lock); |
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|
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static const char *type2name[4] = { "single", "page", "scather-gather", "coherent" }; static const char *dir2name[4] = { "DMA_BIDIRECTIONAL", "DMA_TO_DEVICE", "DMA_FROM_DEVICE", "DMA_NONE" }; |
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/* little merge helper - remove it after the merge window */ #ifndef BUS_NOTIFY_UNBOUND_DRIVER #define BUS_NOTIFY_UNBOUND_DRIVER 0x0005 #endif |
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/* * The access to some variables in this macro is racy. We can't use atomic_t * here because all these variables are exported to debugfs. Some of them even * writeable. This is also the reason why a lock won't help much. But anyway, * the races are no big deal. Here is why: * * error_count: the addition is racy, but the worst thing that can happen is * that we don't count some errors * show_num_errors: the subtraction is racy. Also no big deal because in * worst case this will result in one warning more in the * system log than the user configured. This variable is * writeable via debugfs. */ |
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static inline void dump_entry_trace(struct dma_debug_entry *entry) { #ifdef CONFIG_STACKTRACE if (entry) { |
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pr_warning("Mapped at: "); |
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print_stack_trace(&entry->stacktrace, 0); } #endif } |
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static bool driver_filter(struct device *dev) { |
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struct device_driver *drv; unsigned long flags; bool ret; |
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/* driver filter off */ if (likely(!current_driver_name[0])) return true; /* driver filter on and initialized */ |
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if (current_driver && dev && dev->driver == current_driver) |
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return true; |
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/* driver filter on, but we can't filter on a NULL device... */ if (!dev) return false; |
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if (current_driver || !current_driver_name[0]) return false; |
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|
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/* driver filter on but not yet initialized */ drv = get_driver(dev->driver); if (!drv) return false; /* lock to protect against change of current_driver_name */ read_lock_irqsave(&driver_name_lock, flags); ret = false; if (drv->name && strncmp(current_driver_name, drv->name, NAME_MAX_LEN - 1) == 0) { current_driver = drv; ret = true; |
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} |
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read_unlock_irqrestore(&driver_name_lock, flags); put_driver(drv); return ret; |
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} |
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#define err_printk(dev, entry, format, arg...) do { \ error_count += 1; \ if (driver_filter(dev) && \ (show_all_errors || show_num_errors > 0)) { \ WARN(1, "%s %s: " format, \ dev ? dev_driver_string(dev) : "NULL", \ dev ? dev_name(dev) : "NULL", ## arg); \ dump_entry_trace(entry); \ } \ if (!show_all_errors && show_num_errors > 0) \ show_num_errors -= 1; \ |
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} while (0); |
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/* * Hash related functions * * Every DMA-API request is saved into a struct dma_debug_entry. To * have quick access to these structs they are stored into a hash. */ static int hash_fn(struct dma_debug_entry *entry) { /* * Hash function is based on the dma address. * We use bits 20-27 here as the index into the hash */ return (entry->dev_addr >> HASH_FN_SHIFT) & HASH_FN_MASK; } /* * Request exclusive access to a hash bucket for a given dma_debug_entry. */ static struct hash_bucket *get_hash_bucket(struct dma_debug_entry *entry, unsigned long *flags) { int idx = hash_fn(entry); unsigned long __flags; spin_lock_irqsave(&dma_entry_hash[idx].lock, __flags); *flags = __flags; return &dma_entry_hash[idx]; } /* * Give up exclusive access to the hash bucket */ static void put_hash_bucket(struct hash_bucket *bucket, unsigned long *flags) { unsigned long __flags = *flags; spin_unlock_irqrestore(&bucket->lock, __flags); } /* * Search a given entry in the hash bucket list */ static struct dma_debug_entry *hash_bucket_find(struct hash_bucket *bucket, struct dma_debug_entry *ref) { |
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struct dma_debug_entry *entry, *ret = NULL; int matches = 0, match_lvl, last_lvl = 0; |
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list_for_each_entry(entry, &bucket->list, list) { |
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if ((entry->dev_addr != ref->dev_addr) || (entry->dev != ref->dev)) continue; /* * Some drivers map the same physical address multiple * times. Without a hardware IOMMU this results in the * same device addresses being put into the dma-debug * hash multiple times too. This can result in false |
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* positives being reported. Therefore we implement a |
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* best-fit algorithm here which returns the entry from * the hash which fits best to the reference value * instead of the first-fit. */ matches += 1; match_lvl = 0; |
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entry->size == ref->size ? ++match_lvl : 0; entry->type == ref->type ? ++match_lvl : 0; entry->direction == ref->direction ? ++match_lvl : 0; entry->sg_call_ents == ref->sg_call_ents ? ++match_lvl : 0; |
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|
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if (match_lvl == 4) { |
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/* perfect-fit - return the result */ |
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return entry; |
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} else if (match_lvl > last_lvl) { /* * We found an entry that fits better then the * previous one */ last_lvl = match_lvl; ret = entry; } |
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} |
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/* * If we have multiple matches but no perfect-fit, just return * NULL. */ ret = (matches == 1) ? ret : NULL; return ret; |
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} /* * Add an entry to a hash bucket */ static void hash_bucket_add(struct hash_bucket *bucket, struct dma_debug_entry *entry) { list_add_tail(&entry->list, &bucket->list); } /* * Remove entry from a hash bucket list */ static void hash_bucket_del(struct dma_debug_entry *entry) { list_del(&entry->list); } /* |
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* Dump mapping entries for debugging purposes */ void debug_dma_dump_mappings(struct device *dev) { int idx; for (idx = 0; idx < HASH_SIZE; idx++) { struct hash_bucket *bucket = &dma_entry_hash[idx]; struct dma_debug_entry *entry; unsigned long flags; spin_lock_irqsave(&bucket->lock, flags); list_for_each_entry(entry, &bucket->list, list) { if (!dev || dev == entry->dev) { dev_info(entry->dev, "%s idx %d P=%Lx D=%Lx L=%Lx %s ", type2name[entry->type], idx, (unsigned long long)entry->paddr, entry->dev_addr, entry->size, dir2name[entry->direction]); } } spin_unlock_irqrestore(&bucket->lock, flags); } } EXPORT_SYMBOL(debug_dma_dump_mappings); /* |
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* Wrapper function for adding an entry to the hash. * This function takes care of locking itself. */ static void add_dma_entry(struct dma_debug_entry *entry) { struct hash_bucket *bucket; unsigned long flags; bucket = get_hash_bucket(entry, &flags); hash_bucket_add(bucket, entry); put_hash_bucket(bucket, &flags); } |
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static struct dma_debug_entry *__dma_entry_alloc(void) { struct dma_debug_entry *entry; entry = list_entry(free_entries.next, struct dma_debug_entry, list); list_del(&entry->list); memset(entry, 0, sizeof(*entry)); num_free_entries -= 1; if (num_free_entries < min_free_entries) min_free_entries = num_free_entries; return entry; } |
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/* struct dma_entry allocator * * The next two functions implement the allocator for * struct dma_debug_entries. */ static struct dma_debug_entry *dma_entry_alloc(void) { struct dma_debug_entry *entry = NULL; unsigned long flags; spin_lock_irqsave(&free_entries_lock, flags); if (list_empty(&free_entries)) { |
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pr_err("DMA-API: debugging out of memory - disabling "); |
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global_disable = true; goto out; } |
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entry = __dma_entry_alloc(); |
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#ifdef CONFIG_STACKTRACE entry->stacktrace.max_entries = DMA_DEBUG_STACKTRACE_ENTRIES; entry->stacktrace.entries = entry->st_entries; entry->stacktrace.skip = 2; save_stack_trace(&entry->stacktrace); #endif |
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out: spin_unlock_irqrestore(&free_entries_lock, flags); return entry; } static void dma_entry_free(struct dma_debug_entry *entry) { unsigned long flags; /* * add to beginning of the list - this way the entries are * more likely cache hot when they are reallocated. */ spin_lock_irqsave(&free_entries_lock, flags); list_add(&entry->list, &free_entries); num_free_entries += 1; spin_unlock_irqrestore(&free_entries_lock, flags); } |
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int dma_debug_resize_entries(u32 num_entries) { int i, delta, ret = 0; unsigned long flags; struct dma_debug_entry *entry; LIST_HEAD(tmp); spin_lock_irqsave(&free_entries_lock, flags); if (nr_total_entries < num_entries) { delta = num_entries - nr_total_entries; spin_unlock_irqrestore(&free_entries_lock, flags); for (i = 0; i < delta; i++) { entry = kzalloc(sizeof(*entry), GFP_KERNEL); if (!entry) break; list_add_tail(&entry->list, &tmp); } spin_lock_irqsave(&free_entries_lock, flags); list_splice(&tmp, &free_entries); nr_total_entries += i; num_free_entries += i; } else { delta = nr_total_entries - num_entries; for (i = 0; i < delta && !list_empty(&free_entries); i++) { entry = __dma_entry_alloc(); kfree(entry); } nr_total_entries -= i; } if (nr_total_entries != num_entries) ret = 1; spin_unlock_irqrestore(&free_entries_lock, flags); return ret; } EXPORT_SYMBOL(dma_debug_resize_entries); |
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/* * DMA-API debugging init code * * The init code does two things: * 1. Initialize core data structures * 2. Preallocate a given number of dma_debug_entry structs */ static int prealloc_memory(u32 num_entries) { struct dma_debug_entry *entry, *next_entry; int i; for (i = 0; i < num_entries; ++i) { entry = kzalloc(sizeof(*entry), GFP_KERNEL); if (!entry) goto out_err; list_add_tail(&entry->list, &free_entries); } num_free_entries = num_entries; min_free_entries = num_entries; |
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pr_info("DMA-API: preallocated %d debug entries ", num_entries); |
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return 0; out_err: list_for_each_entry_safe(entry, next_entry, &free_entries, list) { list_del(&entry->list); kfree(entry); } return -ENOMEM; } |
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static ssize_t filter_read(struct file *file, char __user *user_buf, size_t count, loff_t *ppos) { |
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char buf[NAME_MAX_LEN + 1]; |
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unsigned long flags; |
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int len; if (!current_driver_name[0]) return 0; /* * We can't copy to userspace directly because current_driver_name can * only be read under the driver_name_lock with irqs disabled. So * create a temporary copy first. */ read_lock_irqsave(&driver_name_lock, flags); len = scnprintf(buf, NAME_MAX_LEN + 1, "%s ", current_driver_name); read_unlock_irqrestore(&driver_name_lock, flags); return simple_read_from_buffer(user_buf, count, ppos, buf, len); } static ssize_t filter_write(struct file *file, const char __user *userbuf, size_t count, loff_t *ppos) { |
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char buf[NAME_MAX_LEN]; |
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unsigned long flags; size_t len; |
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int i; /* * We can't copy from userspace directly. Access to * current_driver_name is protected with a write_lock with irqs * disabled. Since copy_from_user can fault and may sleep we * need to copy to temporary buffer first */ |
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len = min(count, (size_t)(NAME_MAX_LEN - 1)); |
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if (copy_from_user(buf, userbuf, len)) return -EFAULT; buf[len] = 0; write_lock_irqsave(&driver_name_lock, flags); |
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/* * Now handle the string we got from userspace very carefully. |
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* The rules are: * - only use the first token we got * - token delimiter is everything looking like a space * character (' ', ' ', '\t' ...) * */ if (!isalnum(buf[0])) { /* |
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* If the first character userspace gave us is not |
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* alphanumerical then assume the filter should be * switched off. */ if (current_driver_name[0]) |
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pr_info("DMA-API: switching off dma-debug driver filter "); |
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current_driver_name[0] = 0; current_driver = NULL; goto out_unlock; } /* * Now parse out the first token and use it as the name for the * driver to filter for. */ |
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for (i = 0; i < NAME_MAX_LEN - 1; ++i) { |
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current_driver_name[i] = buf[i]; if (isspace(buf[i]) || buf[i] == ' ' || buf[i] == 0) break; } current_driver_name[i] = 0; current_driver = NULL; |
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pr_info("DMA-API: enable driver filter for driver [%s] ", current_driver_name); |
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out_unlock: write_unlock_irqrestore(&driver_name_lock, flags); return count; } |
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static const struct file_operations filter_fops = { |
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.read = filter_read, .write = filter_write, |
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.llseek = default_llseek, |
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}; |
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static int dma_debug_fs_init(void) { dma_debug_dent = debugfs_create_dir("dma-api", NULL); if (!dma_debug_dent) { |
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pr_err("DMA-API: can not create debugfs directory "); |
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return -ENOMEM; } global_disable_dent = debugfs_create_bool("disabled", 0444, dma_debug_dent, (u32 *)&global_disable); if (!global_disable_dent) goto out_err; error_count_dent = debugfs_create_u32("error_count", 0444, dma_debug_dent, &error_count); if (!error_count_dent) goto out_err; show_all_errors_dent = debugfs_create_u32("all_errors", 0644, dma_debug_dent, &show_all_errors); if (!show_all_errors_dent) goto out_err; show_num_errors_dent = debugfs_create_u32("num_errors", 0644, dma_debug_dent, &show_num_errors); if (!show_num_errors_dent) goto out_err; num_free_entries_dent = debugfs_create_u32("num_free_entries", 0444, dma_debug_dent, &num_free_entries); if (!num_free_entries_dent) goto out_err; min_free_entries_dent = debugfs_create_u32("min_free_entries", 0444, dma_debug_dent, &min_free_entries); if (!min_free_entries_dent) goto out_err; |
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filter_dent = debugfs_create_file("driver_filter", 0644, dma_debug_dent, NULL, &filter_fops); if (!filter_dent) goto out_err; |
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return 0; out_err: debugfs_remove_recursive(dma_debug_dent); return -ENOMEM; } |
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static int device_dma_allocations(struct device *dev, struct dma_debug_entry **out_entry) |
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{ struct dma_debug_entry *entry; unsigned long flags; int count = 0, i; |
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local_irq_save(flags); |
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for (i = 0; i < HASH_SIZE; ++i) { |
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spin_lock(&dma_entry_hash[i].lock); |
ed888aef4 dma-debug: re-add... |
636 |
list_for_each_entry(entry, &dma_entry_hash[i].list, list) { |
ba4b87ad5 dma-debug: print ... |
637 |
if (entry->dev == dev) { |
ed888aef4 dma-debug: re-add... |
638 |
count += 1; |
ba4b87ad5 dma-debug: print ... |
639 640 |
*out_entry = entry; } |
ed888aef4 dma-debug: re-add... |
641 |
} |
be81c6ea2 dma-debug: disabl... |
642 |
spin_unlock(&dma_entry_hash[i].lock); |
ed888aef4 dma-debug: re-add... |
643 |
} |
be81c6ea2 dma-debug: disabl... |
644 |
local_irq_restore(flags); |
ed888aef4 dma-debug: re-add... |
645 646 |
return count; } |
a8fe9ea20 dma-debug: Fix bu... |
647 |
static int dma_debug_device_change(struct notifier_block *nb, unsigned long action, void *data) |
ed888aef4 dma-debug: re-add... |
648 649 |
{ struct device *dev = data; |
ba4b87ad5 dma-debug: print ... |
650 |
struct dma_debug_entry *uninitialized_var(entry); |
ed888aef4 dma-debug: re-add... |
651 |
int count; |
f797d9881 dma-debug: Do not... |
652 |
if (global_disable) |
a8fe9ea20 dma-debug: Fix bu... |
653 |
return 0; |
ed888aef4 dma-debug: re-add... |
654 655 656 |
switch (action) { case BUS_NOTIFY_UNBOUND_DRIVER: |
ba4b87ad5 dma-debug: print ... |
657 |
count = device_dma_allocations(dev, &entry); |
ed888aef4 dma-debug: re-add... |
658 659 |
if (count == 0) break; |
ba4b87ad5 dma-debug: print ... |
660 |
err_printk(dev, entry, "DMA-API: device driver has pending " |
ed888aef4 dma-debug: re-add... |
661 |
"DMA allocations while released from device " |
ba4b87ad5 dma-debug: print ... |
662 663 664 665 666 667 668 669 |
"[count=%d] " "One of leaked entries details: " "[device address=0x%016llx] [size=%llu bytes] " "[mapped with %s] [mapped as %s] ", count, entry->dev_addr, entry->size, dir2name[entry->direction], type2name[entry->type]); |
ed888aef4 dma-debug: re-add... |
670 671 672 673 674 675 676 |
break; default: break; } return 0; } |
41531c8f5 dma-debug: add a ... |
677 678 |
void dma_debug_add_bus(struct bus_type *bus) { |
ed888aef4 dma-debug: re-add... |
679 |
struct notifier_block *nb; |
f797d9881 dma-debug: Do not... |
680 681 |
if (global_disable) return; |
ed888aef4 dma-debug: re-add... |
682 683 |
nb = kzalloc(sizeof(struct notifier_block), GFP_KERNEL); if (nb == NULL) { |
e7ed70eed dma-debug: use pr... |
684 685 |
pr_err("dma_debug_add_bus: out of memory "); |
ed888aef4 dma-debug: re-add... |
686 687 688 689 690 691 |
return; } nb->notifier_call = dma_debug_device_change; bus_register_notifier(bus, nb); |
41531c8f5 dma-debug: add a ... |
692 |
} |
788dcfa6f dma-debug: add de... |
693 |
|
6bf078715 dma-debug: add in... |
694 695 696 697 698 699 700 701 702 703 704 705 |
/* * Let the architectures decide how many entries should be preallocated. */ void dma_debug_init(u32 num_entries) { int i; if (global_disable) return; for (i = 0; i < HASH_SIZE; ++i) { INIT_LIST_HEAD(&dma_entry_hash[i].list); |
b0a5b83ee dma-debug: Put al... |
706 |
spin_lock_init(&dma_entry_hash[i].lock); |
6bf078715 dma-debug: add in... |
707 |
} |
788dcfa6f dma-debug: add de... |
708 |
if (dma_debug_fs_init() != 0) { |
e7ed70eed dma-debug: use pr... |
709 710 |
pr_err("DMA-API: error creating debugfs entries - disabling "); |
788dcfa6f dma-debug: add de... |
711 712 713 714 |
global_disable = true; return; } |
59d3daafa dma-debug: add ke... |
715 716 |
if (req_entries) num_entries = req_entries; |
6bf078715 dma-debug: add in... |
717 |
if (prealloc_memory(num_entries) != 0) { |
e7ed70eed dma-debug: use pr... |
718 719 |
pr_err("DMA-API: debugging out of memory error - disabled "); |
6bf078715 dma-debug: add in... |
720 721 722 723 |
global_disable = true; return; } |
e6a1a89d5 dma-debug: add dm... |
724 |
nr_total_entries = num_free_entries; |
e7ed70eed dma-debug: use pr... |
725 726 |
pr_info("DMA-API: debugging enabled by kernel config "); |
6bf078715 dma-debug: add in... |
727 |
} |
59d3daafa dma-debug: add ke... |
728 729 730 731 732 733 |
static __init int dma_debug_cmdline(char *str) { if (!str) return -EINVAL; if (strncmp(str, "off", 3) == 0) { |
e7ed70eed dma-debug: use pr... |
734 735 |
pr_info("DMA-API: debugging disabled on kernel command line "); |
59d3daafa dma-debug: add ke... |
736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 |
global_disable = true; } return 0; } static __init int dma_debug_entries_cmdline(char *str) { int res; if (!str) return -EINVAL; res = get_option(&str, &req_entries); if (!res) req_entries = 0; return 0; } __setup("dma_debug=", dma_debug_cmdline); __setup("dma_debug_entries=", dma_debug_entries_cmdline); |
2d62ece14 dma-debug: add co... |
759 760 761 762 763 |
static void check_unmap(struct dma_debug_entry *ref) { struct dma_debug_entry *entry; struct hash_bucket *bucket; unsigned long flags; |
35d40952d dma-debug: warn o... |
764 765 766 767 |
if (dma_mapping_error(ref->dev, ref->dev_addr)) { err_printk(ref->dev, NULL, "DMA-API: device driver tries " "to free an invalid DMA memory address "); |
2d62ece14 dma-debug: add co... |
768 |
return; |
35d40952d dma-debug: warn o... |
769 |
} |
2d62ece14 dma-debug: add co... |
770 771 772 773 774 |
bucket = get_hash_bucket(ref, &flags); entry = hash_bucket_find(bucket, ref); if (!entry) { |
6c132d1bc dma-debug: print ... |
775 |
err_printk(ref->dev, NULL, "DMA-API: device driver tries " |
2d62ece14 dma-debug: add co... |
776 777 778 779 780 781 782 783 |
"to free DMA memory it has not allocated " "[device address=0x%016llx] [size=%llu bytes] ", ref->dev_addr, ref->size); goto out; } if (ref->size != entry->size) { |
6c132d1bc dma-debug: print ... |
784 |
err_printk(ref->dev, entry, "DMA-API: device driver frees " |
2d62ece14 dma-debug: add co... |
785 786 787 788 789 790 791 792 |
"DMA memory with different size " "[device address=0x%016llx] [map size=%llu bytes] " "[unmap size=%llu bytes] ", ref->dev_addr, entry->size, ref->size); } if (ref->type != entry->type) { |
6c132d1bc dma-debug: print ... |
793 |
err_printk(ref->dev, entry, "DMA-API: device driver frees " |
2d62ece14 dma-debug: add co... |
794 795 796 797 798 799 800 801 |
"DMA memory with wrong function " "[device address=0x%016llx] [size=%llu bytes] " "[mapped as %s] [unmapped as %s] ", ref->dev_addr, ref->size, type2name[entry->type], type2name[ref->type]); } else if ((entry->type == dma_debug_coherent) && (ref->paddr != entry->paddr)) { |
6c132d1bc dma-debug: print ... |
802 |
err_printk(ref->dev, entry, "DMA-API: device driver frees " |
2d62ece14 dma-debug: add co... |
803 804 |
"DMA memory with different CPU address " "[device address=0x%016llx] [size=%llu bytes] " |
59a40e704 dma-debug: Fix co... |
805 806 |
"[cpu alloc address=0x%016llx] " "[cpu free address=0x%016llx]", |
2d62ece14 dma-debug: add co... |
807 |
ref->dev_addr, ref->size, |
59a40e704 dma-debug: Fix co... |
808 809 |
(unsigned long long)entry->paddr, (unsigned long long)ref->paddr); |
2d62ece14 dma-debug: add co... |
810 811 812 813 |
} if (ref->sg_call_ents && ref->type == dma_debug_sg && ref->sg_call_ents != entry->sg_call_ents) { |
6c132d1bc dma-debug: print ... |
814 |
err_printk(ref->dev, entry, "DMA-API: device driver frees " |
2d62ece14 dma-debug: add co... |
815 816 817 818 819 820 821 822 823 824 825 |
"DMA sg list with different entry count " "[map count=%d] [unmap count=%d] ", entry->sg_call_ents, ref->sg_call_ents); } /* * This may be no bug in reality - but most implementations of the * DMA API don't handle this properly, so check for it here */ if (ref->direction != entry->direction) { |
6c132d1bc dma-debug: print ... |
826 |
err_printk(ref->dev, entry, "DMA-API: device driver frees " |
2d62ece14 dma-debug: add co... |
827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 |
"DMA memory with different direction " "[device address=0x%016llx] [size=%llu bytes] " "[mapped with %s] [unmapped with %s] ", ref->dev_addr, ref->size, dir2name[entry->direction], dir2name[ref->direction]); } hash_bucket_del(entry); dma_entry_free(entry); out: put_hash_bucket(bucket, &flags); } static void check_for_stack(struct device *dev, void *addr) { if (object_is_on_stack(addr)) |
6c132d1bc dma-debug: print ... |
846 847 848 |
err_printk(dev, NULL, "DMA-API: device driver maps memory from" "stack [addr=%p] ", addr); |
2d62ece14 dma-debug: add co... |
849 |
} |
f39d1b979 dma-debug: Fix th... |
850 |
static inline bool overlap(void *addr, unsigned long len, void *start, void *end) |
2e34bde18 dma-debug: add ch... |
851 |
{ |
f39d1b979 dma-debug: Fix th... |
852 853 854 855 |
unsigned long a1 = (unsigned long)addr; unsigned long b1 = a1 + len; unsigned long a2 = (unsigned long)start; unsigned long b2 = (unsigned long)end; |
2e34bde18 dma-debug: add ch... |
856 |
|
f39d1b979 dma-debug: Fix th... |
857 |
return !(b1 <= a2 || a1 >= b2); |
2e34bde18 dma-debug: add ch... |
858 |
} |
f39d1b979 dma-debug: Fix th... |
859 |
static void check_for_illegal_area(struct device *dev, void *addr, unsigned long len) |
2e34bde18 dma-debug: add ch... |
860 |
{ |
f39d1b979 dma-debug: Fix th... |
861 862 863 864 |
if (overlap(addr, len, _text, _etext) || overlap(addr, len, __start_rodata, __end_rodata)) err_printk(dev, NULL, "DMA-API: device driver maps memory from kernel text or rodata [addr=%p] [len=%lu] ", addr, len); |
2e34bde18 dma-debug: add ch... |
865 |
} |
aa010efb7 dma-debug: be mor... |
866 867 868 |
static void check_sync(struct device *dev, struct dma_debug_entry *ref, bool to_cpu) |
2d62ece14 dma-debug: add co... |
869 |
{ |
2d62ece14 dma-debug: add co... |
870 871 872 |
struct dma_debug_entry *entry; struct hash_bucket *bucket; unsigned long flags; |
aa010efb7 dma-debug: be mor... |
873 |
bucket = get_hash_bucket(ref, &flags); |
2d62ece14 dma-debug: add co... |
874 |
|
aa010efb7 dma-debug: be mor... |
875 |
entry = hash_bucket_find(bucket, ref); |
2d62ece14 dma-debug: add co... |
876 877 |
if (!entry) { |
6c132d1bc dma-debug: print ... |
878 |
err_printk(dev, NULL, "DMA-API: device driver tries " |
2d62ece14 dma-debug: add co... |
879 880 881 |
"to sync DMA memory it has not allocated " "[device address=0x%016llx] [size=%llu bytes] ", |
aa010efb7 dma-debug: be mor... |
882 |
(unsigned long long)ref->dev_addr, ref->size); |
2d62ece14 dma-debug: add co... |
883 884 |
goto out; } |
aa010efb7 dma-debug: be mor... |
885 |
if (ref->size > entry->size) { |
6c132d1bc dma-debug: print ... |
886 |
err_printk(dev, entry, "DMA-API: device driver syncs" |
2d62ece14 dma-debug: add co... |
887 888 |
" DMA memory outside allocated range " "[device address=0x%016llx] " |
aa010efb7 dma-debug: be mor... |
889 890 891 892 893 |
"[allocation size=%llu bytes] " "[sync offset+size=%llu] ", entry->dev_addr, entry->size, ref->size); |
2d62ece14 dma-debug: add co... |
894 |
} |
42d53b4ff dma-debug: allow ... |
895 896 |
if (entry->direction == DMA_BIDIRECTIONAL) goto out; |
aa010efb7 dma-debug: be mor... |
897 |
if (ref->direction != entry->direction) { |
6c132d1bc dma-debug: print ... |
898 |
err_printk(dev, entry, "DMA-API: device driver syncs " |
2d62ece14 dma-debug: add co... |
899 900 901 902 |
"DMA memory with different direction " "[device address=0x%016llx] [size=%llu bytes] " "[mapped with %s] [synced with %s] ", |
aa010efb7 dma-debug: be mor... |
903 |
(unsigned long long)ref->dev_addr, entry->size, |
2d62ece14 dma-debug: add co... |
904 |
dir2name[entry->direction], |
aa010efb7 dma-debug: be mor... |
905 |
dir2name[ref->direction]); |
2d62ece14 dma-debug: add co... |
906 |
} |
2d62ece14 dma-debug: add co... |
907 |
if (to_cpu && !(entry->direction == DMA_FROM_DEVICE) && |
aa010efb7 dma-debug: be mor... |
908 |
!(ref->direction == DMA_TO_DEVICE)) |
6c132d1bc dma-debug: print ... |
909 |
err_printk(dev, entry, "DMA-API: device driver syncs " |
2d62ece14 dma-debug: add co... |
910 911 912 913 |
"device read-only DMA memory for cpu " "[device address=0x%016llx] [size=%llu bytes] " "[mapped with %s] [synced with %s] ", |
aa010efb7 dma-debug: be mor... |
914 |
(unsigned long long)ref->dev_addr, entry->size, |
2d62ece14 dma-debug: add co... |
915 |
dir2name[entry->direction], |
aa010efb7 dma-debug: be mor... |
916 |
dir2name[ref->direction]); |
2d62ece14 dma-debug: add co... |
917 918 |
if (!to_cpu && !(entry->direction == DMA_TO_DEVICE) && |
aa010efb7 dma-debug: be mor... |
919 |
!(ref->direction == DMA_FROM_DEVICE)) |
6c132d1bc dma-debug: print ... |
920 |
err_printk(dev, entry, "DMA-API: device driver syncs " |
2d62ece14 dma-debug: add co... |
921 922 923 924 |
"device write-only DMA memory to device " "[device address=0x%016llx] [size=%llu bytes] " "[mapped with %s] [synced with %s] ", |
aa010efb7 dma-debug: be mor... |
925 |
(unsigned long long)ref->dev_addr, entry->size, |
2d62ece14 dma-debug: add co... |
926 |
dir2name[entry->direction], |
aa010efb7 dma-debug: be mor... |
927 |
dir2name[ref->direction]); |
2d62ece14 dma-debug: add co... |
928 929 930 |
out: put_hash_bucket(bucket, &flags); |
2d62ece14 dma-debug: add co... |
931 |
} |
f62bc980e dma-debug: add ch... |
932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 |
void debug_dma_map_page(struct device *dev, struct page *page, size_t offset, size_t size, int direction, dma_addr_t dma_addr, bool map_single) { struct dma_debug_entry *entry; if (unlikely(global_disable)) return; if (unlikely(dma_mapping_error(dev, dma_addr))) return; entry = dma_entry_alloc(); if (!entry) return; entry->dev = dev; entry->type = dma_debug_page; entry->paddr = page_to_phys(page) + offset; entry->dev_addr = dma_addr; entry->size = size; entry->direction = direction; |
9537a48ed dma-debug: make m... |
954 |
if (map_single) |
f62bc980e dma-debug: add ch... |
955 |
entry->type = dma_debug_single; |
9537a48ed dma-debug: make m... |
956 957 |
if (!PageHighMem(page)) { |
f39d1b979 dma-debug: Fix th... |
958 |
void *addr = page_address(page) + offset; |
2e34bde18 dma-debug: add ch... |
959 960 |
check_for_stack(dev, addr); check_for_illegal_area(dev, addr, size); |
f62bc980e dma-debug: add ch... |
961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 |
} add_dma_entry(entry); } EXPORT_SYMBOL(debug_dma_map_page); void debug_dma_unmap_page(struct device *dev, dma_addr_t addr, size_t size, int direction, bool map_single) { struct dma_debug_entry ref = { .type = dma_debug_page, .dev = dev, .dev_addr = addr, .size = size, .direction = direction, }; if (unlikely(global_disable)) return; if (map_single) ref.type = dma_debug_single; check_unmap(&ref); } EXPORT_SYMBOL(debug_dma_unmap_page); |
972aa45ce dma-debug: add ad... |
987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 |
void debug_dma_map_sg(struct device *dev, struct scatterlist *sg, int nents, int mapped_ents, int direction) { struct dma_debug_entry *entry; struct scatterlist *s; int i; if (unlikely(global_disable)) return; for_each_sg(sg, s, mapped_ents, i) { entry = dma_entry_alloc(); if (!entry) return; entry->type = dma_debug_sg; entry->dev = dev; entry->paddr = sg_phys(s); |
884d05970 dma-debug: use sg... |
1005 |
entry->size = sg_dma_len(s); |
15aedea43 dma-debug: use sg... |
1006 |
entry->dev_addr = sg_dma_address(s); |
972aa45ce dma-debug: add ad... |
1007 1008 1009 |
entry->direction = direction; entry->sg_call_ents = nents; entry->sg_mapped_ents = mapped_ents; |
9537a48ed dma-debug: make m... |
1010 1011 |
if (!PageHighMem(sg_page(s))) { check_for_stack(dev, sg_virt(s)); |
884d05970 dma-debug: use sg... |
1012 |
check_for_illegal_area(dev, sg_virt(s), sg_dma_len(s)); |
9537a48ed dma-debug: make m... |
1013 |
} |
972aa45ce dma-debug: add ad... |
1014 1015 1016 1017 1018 |
add_dma_entry(entry); } } EXPORT_SYMBOL(debug_dma_map_sg); |
aa010efb7 dma-debug: be mor... |
1019 1020 |
static int get_nr_mapped_entries(struct device *dev, struct dma_debug_entry *ref) |
88f3907f6 dma-debug: fix de... |
1021 |
{ |
aa010efb7 dma-debug: be mor... |
1022 |
struct dma_debug_entry *entry; |
88f3907f6 dma-debug: fix de... |
1023 1024 |
struct hash_bucket *bucket; unsigned long flags; |
c17e2cf73 dma-debug: code s... |
1025 |
int mapped_ents; |
88f3907f6 dma-debug: fix de... |
1026 |
|
aa010efb7 dma-debug: be mor... |
1027 1028 |
bucket = get_hash_bucket(ref, &flags); entry = hash_bucket_find(bucket, ref); |
c17e2cf73 dma-debug: code s... |
1029 |
mapped_ents = 0; |
88f3907f6 dma-debug: fix de... |
1030 |
|
88f3907f6 dma-debug: fix de... |
1031 1032 1033 1034 1035 1036 |
if (entry) mapped_ents = entry->sg_mapped_ents; put_hash_bucket(bucket, &flags); return mapped_ents; } |
972aa45ce dma-debug: add ad... |
1037 1038 1039 |
void debug_dma_unmap_sg(struct device *dev, struct scatterlist *sglist, int nelems, int dir) { |
972aa45ce dma-debug: add ad... |
1040 1041 |
struct scatterlist *s; int mapped_ents = 0, i; |
972aa45ce dma-debug: add ad... |
1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 |
if (unlikely(global_disable)) return; for_each_sg(sglist, s, nelems, i) { struct dma_debug_entry ref = { .type = dma_debug_sg, .dev = dev, .paddr = sg_phys(s), |
15aedea43 dma-debug: use sg... |
1052 |
.dev_addr = sg_dma_address(s), |
884d05970 dma-debug: use sg... |
1053 |
.size = sg_dma_len(s), |
972aa45ce dma-debug: add ad... |
1054 |
.direction = dir, |
e5e8c5b90 dma-debug: check ... |
1055 |
.sg_call_ents = nelems, |
972aa45ce dma-debug: add ad... |
1056 1057 1058 1059 |
}; if (mapped_ents && i >= mapped_ents) break; |
e5e8c5b90 dma-debug: check ... |
1060 |
if (!i) |
aa010efb7 dma-debug: be mor... |
1061 |
mapped_ents = get_nr_mapped_entries(dev, &ref); |
972aa45ce dma-debug: add ad... |
1062 1063 1064 1065 1066 |
check_unmap(&ref); } } EXPORT_SYMBOL(debug_dma_unmap_sg); |
6bfd44987 dma-debug: add ch... |
1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 |
void debug_dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t dma_addr, void *virt) { struct dma_debug_entry *entry; if (unlikely(global_disable)) return; if (unlikely(virt == NULL)) return; entry = dma_entry_alloc(); if (!entry) return; entry->type = dma_debug_coherent; entry->dev = dev; entry->paddr = virt_to_phys(virt); entry->size = size; entry->dev_addr = dma_addr; entry->direction = DMA_BIDIRECTIONAL; add_dma_entry(entry); } EXPORT_SYMBOL(debug_dma_alloc_coherent); void debug_dma_free_coherent(struct device *dev, size_t size, void *virt, dma_addr_t addr) { struct dma_debug_entry ref = { .type = dma_debug_coherent, .dev = dev, .paddr = virt_to_phys(virt), .dev_addr = addr, .size = size, .direction = DMA_BIDIRECTIONAL, }; if (unlikely(global_disable)) return; check_unmap(&ref); } EXPORT_SYMBOL(debug_dma_free_coherent); |
b9d2317e0 dma-debug: add ch... |
1111 1112 1113 |
void debug_dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size, int direction) { |
aa010efb7 dma-debug: be mor... |
1114 |
struct dma_debug_entry ref; |
b9d2317e0 dma-debug: add ch... |
1115 1116 |
if (unlikely(global_disable)) return; |
aa010efb7 dma-debug: be mor... |
1117 1118 1119 1120 1121 1122 1123 1124 |
ref.type = dma_debug_single; ref.dev = dev; ref.dev_addr = dma_handle; ref.size = size; ref.direction = direction; ref.sg_call_ents = 0; check_sync(dev, &ref, true); |
b9d2317e0 dma-debug: add ch... |
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} EXPORT_SYMBOL(debug_dma_sync_single_for_cpu); void debug_dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, size_t size, int direction) { |
aa010efb7 dma-debug: be mor... |
1132 |
struct dma_debug_entry ref; |
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if (unlikely(global_disable)) return; |
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ref.type = dma_debug_single; ref.dev = dev; ref.dev_addr = dma_handle; ref.size = size; ref.direction = direction; ref.sg_call_ents = 0; check_sync(dev, &ref, false); |
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1143 1144 |
} EXPORT_SYMBOL(debug_dma_sync_single_for_device); |
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void debug_dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle, unsigned long offset, size_t size, int direction) { |
aa010efb7 dma-debug: be mor... |
1150 |
struct dma_debug_entry ref; |
948408ba3 dma-debug: add ch... |
1151 1152 |
if (unlikely(global_disable)) return; |
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ref.type = dma_debug_single; ref.dev = dev; ref.dev_addr = dma_handle; ref.size = offset + size; ref.direction = direction; ref.sg_call_ents = 0; check_sync(dev, &ref, true); |
948408ba3 dma-debug: add ch... |
1161 1162 1163 1164 1165 1166 1167 1168 |
} EXPORT_SYMBOL(debug_dma_sync_single_range_for_cpu); void debug_dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle, unsigned long offset, size_t size, int direction) { |
aa010efb7 dma-debug: be mor... |
1169 |
struct dma_debug_entry ref; |
948408ba3 dma-debug: add ch... |
1170 1171 |
if (unlikely(global_disable)) return; |
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1172 1173 1174 1175 1176 1177 1178 1179 |
ref.type = dma_debug_single; ref.dev = dev; ref.dev_addr = dma_handle; ref.size = offset + size; ref.direction = direction; ref.sg_call_ents = 0; check_sync(dev, &ref, false); |
948408ba3 dma-debug: add ch... |
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} EXPORT_SYMBOL(debug_dma_sync_single_range_for_device); |
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1182 1183 1184 1185 |
void debug_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems, int direction) { struct scatterlist *s; |
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1186 |
int mapped_ents = 0, i; |
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1187 1188 1189 1190 1191 |
if (unlikely(global_disable)) return; for_each_sg(sg, s, nelems, i) { |
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struct dma_debug_entry ref = { .type = dma_debug_sg, .dev = dev, .paddr = sg_phys(s), .dev_addr = sg_dma_address(s), .size = sg_dma_len(s), .direction = direction, .sg_call_ents = nelems, }; |
88f3907f6 dma-debug: fix de... |
1202 |
if (!i) |
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1203 |
mapped_ents = get_nr_mapped_entries(dev, &ref); |
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if (i >= mapped_ents) break; |
aa010efb7 dma-debug: be mor... |
1207 |
check_sync(dev, &ref, true); |
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} } EXPORT_SYMBOL(debug_dma_sync_sg_for_cpu); void debug_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems, int direction) { struct scatterlist *s; |
88f3907f6 dma-debug: fix de... |
1216 |
int mapped_ents = 0, i; |
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1217 1218 1219 1220 1221 |
if (unlikely(global_disable)) return; for_each_sg(sg, s, nelems, i) { |
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struct dma_debug_entry ref = { .type = dma_debug_sg, .dev = dev, .paddr = sg_phys(s), .dev_addr = sg_dma_address(s), .size = sg_dma_len(s), .direction = direction, .sg_call_ents = nelems, }; |
88f3907f6 dma-debug: fix de... |
1232 |
if (!i) |
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1233 |
mapped_ents = get_nr_mapped_entries(dev, &ref); |
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1234 1235 1236 |
if (i >= mapped_ents) break; |
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1237 |
check_sync(dev, &ref, false); |
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1238 1239 1240 |
} } EXPORT_SYMBOL(debug_dma_sync_sg_for_device); |
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static int __init dma_debug_driver_setup(char *str) { int i; for (i = 0; i < NAME_MAX_LEN - 1; ++i, ++str) { current_driver_name[i] = *str; if (*str == 0) break; } if (current_driver_name[0]) |
e7ed70eed dma-debug: use pr... |
1252 1253 1254 |
pr_info("DMA-API: enable driver filter for driver [%s] ", current_driver_name); |
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1255 1256 1257 1258 1259 |
return 1; } __setup("dma_debug_driver=", dma_debug_driver_setup); |