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lib/dma-debug.c
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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/sched/task_stack.h> |
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#include <linux/scatterlist.h> |
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#include <linux/dma-mapping.h> |
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#include <linux/sched/task.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/vmalloc.h> |
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#include <linux/debugfs.h> |
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#include <linux/uaccess.h> |
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#include <linux/export.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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#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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dma_debug_resource, |
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}; |
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enum map_err_types { MAP_ERR_CHECK_NOT_APPLICABLE, MAP_ERR_NOT_CHECKED, MAP_ERR_CHECKED, }; |
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#define DMA_DEBUG_STACKTRACE_ENTRIES 5 |
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/** * struct dma_debug_entry - track a dma_map* or dma_alloc_coherent mapping * @list: node on pre-allocated free_entries list * @dev: 'dev' argument to dma_map_{page|single|sg} or dma_alloc_coherent * @type: single, page, sg, coherent * @pfn: page frame of the start address * @offset: offset of mapping relative to pfn * @size: length of the mapping * @direction: enum dma_data_direction * @sg_call_ents: 'nents' from dma_map_sg * @sg_mapped_ents: 'mapped_ents' from dma_map_sg * @map_err_type: track whether dma_mapping_error() was checked * @stacktrace: support backtraces when a violation is detected */ |
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struct dma_debug_entry { struct list_head list; struct device *dev; int type; |
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unsigned long pfn; size_t offset; |
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u64 dev_addr; u64 size; int direction; int sg_call_ents; int sg_mapped_ents; |
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enum map_err_types map_err_type; |
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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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typedef bool (*match_fn)(struct dma_debug_entry *, struct dma_debug_entry *); |
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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 */ |
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static bool global_disable __read_mostly; |
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/* Early initialization disable flag, set at the end of dma_debug_init */ static bool dma_debug_initialized __read_mostly; |
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static inline bool dma_debug_disabled(void) { |
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return global_disable || !dma_debug_initialized; |
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} |
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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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/* 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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static const char *const maperr2str[] = { [MAP_ERR_CHECK_NOT_APPLICABLE] = "dma map error check not applicable", [MAP_ERR_NOT_CHECKED] = "dma map error not checked", [MAP_ERR_CHECKED] = "dma map error checked", }; |
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static const char *type2name[5] = { "single", "page", "scather-gather", "coherent", "resource" }; |
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static const char *dir2name[4] = { "DMA_BIDIRECTIONAL", "DMA_TO_DEVICE", "DMA_FROM_DEVICE", "DMA_NONE" }; /* * 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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/* driver filter on but not yet initialized */ |
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drv = dev->driver; |
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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); |
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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) |
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__acquires(&dma_entry_hash[idx].lock) |
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{ 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) |
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__releases(&bucket->lock) |
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{ unsigned long __flags = *flags; spin_unlock_irqrestore(&bucket->lock, __flags); } |
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static bool exact_match(struct dma_debug_entry *a, struct dma_debug_entry *b) { |
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return ((a->dev_addr == b->dev_addr) && |
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(a->dev == b->dev)) ? true : false; } static bool containing_match(struct dma_debug_entry *a, struct dma_debug_entry *b) { if (a->dev != b->dev) return false; if ((b->dev_addr <= a->dev_addr) && ((b->dev_addr + b->size) >= (a->dev_addr + a->size))) return true; return false; } |
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/* * Search a given entry in the hash bucket list */ |
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static struct dma_debug_entry *__hash_bucket_find(struct hash_bucket *bucket, struct dma_debug_entry *ref, match_fn match) |
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{ |
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struct dma_debug_entry *entry, *ret = NULL; |
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int matches = 0, match_lvl, last_lvl = -1; |
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list_for_each_entry(entry, &bucket->list, list) { |
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if (!match(ref, entry)) |
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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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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 |
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* previous one or it is the 1st match. |
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*/ 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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} |
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static struct dma_debug_entry *bucket_find_exact(struct hash_bucket *bucket, struct dma_debug_entry *ref) { return __hash_bucket_find(bucket, ref, exact_match); } static struct dma_debug_entry *bucket_find_contain(struct hash_bucket **bucket, struct dma_debug_entry *ref, unsigned long *flags) { unsigned int max_range = dma_get_max_seg_size(ref->dev); struct dma_debug_entry *entry, index = *ref; unsigned int range = 0; while (range <= max_range) { |
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entry = __hash_bucket_find(*bucket, ref, containing_match); |
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if (entry) return entry; /* * Nothing found, go back a hash bucket */ put_hash_bucket(*bucket, flags); range += (1 << HASH_FN_SHIFT); index.dev_addr -= (1 << HASH_FN_SHIFT); *bucket = get_hash_bucket(&index, flags); } return NULL; } |
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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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static unsigned long long phys_addr(struct dma_debug_entry *entry) { |
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if (entry->type == dma_debug_resource) return __pfn_to_phys(entry->pfn) + entry->offset; |
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return page_to_phys(pfn_to_page(entry->pfn)) + entry->offset; } |
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/* |
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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, |
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"%s idx %d P=%Lx N=%lx D=%Lx L=%Lx %s %s ", |
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type2name[entry->type], idx, |
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phys_addr(entry), entry->pfn, |
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entry->dev_addr, entry->size, |
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dir2name[entry->direction], maperr2str[entry->map_err_type]); |
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} } spin_unlock_irqrestore(&bucket->lock, flags); } } EXPORT_SYMBOL(debug_dma_dump_mappings); /* |
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* For each mapping (initial cacheline in the case of * dma_alloc_coherent/dma_map_page, initial cacheline in each page of a * scatterlist, or the cacheline specified in dma_map_single) insert * into this tree using the cacheline as the key. At |
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* dma_unmap_{single|sg|page} or dma_free_coherent delete the entry. If |
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* the entry already exists at insertion time add a tag as a reference |
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* count for the overlapping mappings. For now, the overlap tracking |
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* just ensures that 'unmaps' balance 'maps' before marking the * cacheline idle, but we should also be flagging overlaps as an API * violation. |
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* * Memory usage is mostly constrained by the maximum number of available * dma-debug entries in that we need a free dma_debug_entry before |
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* inserting into the tree. In the case of dma_map_page and * dma_alloc_coherent there is only one dma_debug_entry and one * dma_active_cacheline entry to track per event. dma_map_sg(), on the * other hand, consumes a single dma_debug_entry, but inserts 'nents' * entries into the tree. |
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* * At any time debug_dma_assert_idle() can be called to trigger a |
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* warning if any cachelines in the given page are in the active set. |
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*/ |
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static RADIX_TREE(dma_active_cacheline, GFP_NOWAIT); |
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static DEFINE_SPINLOCK(radix_lock); |
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#define ACTIVE_CACHELINE_MAX_OVERLAP ((1 << RADIX_TREE_MAX_TAGS) - 1) #define CACHELINE_PER_PAGE_SHIFT (PAGE_SHIFT - L1_CACHE_SHIFT) #define CACHELINES_PER_PAGE (1 << CACHELINE_PER_PAGE_SHIFT) |
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static phys_addr_t to_cacheline_number(struct dma_debug_entry *entry) { return (entry->pfn << CACHELINE_PER_PAGE_SHIFT) + (entry->offset >> L1_CACHE_SHIFT); } static int active_cacheline_read_overlap(phys_addr_t cln) |
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{ int overlap = 0, i; for (i = RADIX_TREE_MAX_TAGS - 1; i >= 0; i--) |
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if (radix_tree_tag_get(&dma_active_cacheline, cln, i)) |
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overlap |= 1 << i; return overlap; } |
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static int active_cacheline_set_overlap(phys_addr_t cln, int overlap) |
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{ int i; |
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if (overlap > ACTIVE_CACHELINE_MAX_OVERLAP || overlap < 0) |
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return overlap; |
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for (i = RADIX_TREE_MAX_TAGS - 1; i >= 0; i--) if (overlap & 1 << i) |
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radix_tree_tag_set(&dma_active_cacheline, cln, i); |
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else |
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radix_tree_tag_clear(&dma_active_cacheline, cln, i); |
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return overlap; } |
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static void active_cacheline_inc_overlap(phys_addr_t cln) |
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{ |
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int overlap = active_cacheline_read_overlap(cln); |
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3b7a6418c dma debug: accoun... |
480 |
overlap = active_cacheline_set_overlap(cln, ++overlap); |
0abdd7a81 dma-debug: introd... |
481 482 483 484 |
/* If we overflowed the overlap counter then we're potentially * leaking dma-mappings. Otherwise, if maps and unmaps are * balanced then this overflow may cause false negatives in |
3b7a6418c dma debug: accoun... |
485 |
* debug_dma_assert_idle() as the cacheline may be marked idle |
0abdd7a81 dma-debug: introd... |
486 487 |
* prematurely. */ |
3b7a6418c dma debug: accoun... |
488 489 490 491 |
WARN_ONCE(overlap > ACTIVE_CACHELINE_MAX_OVERLAP, "DMA-API: exceeded %d overlapping mappings of cacheline %pa ", ACTIVE_CACHELINE_MAX_OVERLAP, &cln); |
0abdd7a81 dma-debug: introd... |
492 |
} |
3b7a6418c dma debug: accoun... |
493 |
static int active_cacheline_dec_overlap(phys_addr_t cln) |
0abdd7a81 dma-debug: introd... |
494 |
{ |
3b7a6418c dma debug: accoun... |
495 |
int overlap = active_cacheline_read_overlap(cln); |
0abdd7a81 dma-debug: introd... |
496 |
|
3b7a6418c dma debug: accoun... |
497 |
return active_cacheline_set_overlap(cln, --overlap); |
0abdd7a81 dma-debug: introd... |
498 |
} |
3b7a6418c dma debug: accoun... |
499 |
static int active_cacheline_insert(struct dma_debug_entry *entry) |
0abdd7a81 dma-debug: introd... |
500 |
{ |
3b7a6418c dma debug: accoun... |
501 |
phys_addr_t cln = to_cacheline_number(entry); |
0abdd7a81 dma-debug: introd... |
502 503 |
unsigned long flags; int rc; |
3b7a6418c dma debug: accoun... |
504 505 506 507 508 509 |
/* If the device is not writing memory then we don't have any * concerns about the cpu consuming stale data. This mitigates * legitimate usages of overlapping mappings. */ if (entry->direction == DMA_TO_DEVICE) return 0; |
0abdd7a81 dma-debug: introd... |
510 |
spin_lock_irqsave(&radix_lock, flags); |
3b7a6418c dma debug: accoun... |
511 |
rc = radix_tree_insert(&dma_active_cacheline, cln, entry); |
0abdd7a81 dma-debug: introd... |
512 |
if (rc == -EEXIST) |
3b7a6418c dma debug: accoun... |
513 |
active_cacheline_inc_overlap(cln); |
0abdd7a81 dma-debug: introd... |
514 515 516 517 |
spin_unlock_irqrestore(&radix_lock, flags); return rc; } |
3b7a6418c dma debug: accoun... |
518 |
static void active_cacheline_remove(struct dma_debug_entry *entry) |
0abdd7a81 dma-debug: introd... |
519 |
{ |
3b7a6418c dma debug: accoun... |
520 |
phys_addr_t cln = to_cacheline_number(entry); |
0abdd7a81 dma-debug: introd... |
521 |
unsigned long flags; |
3b7a6418c dma debug: accoun... |
522 523 524 |
/* ...mirror the insert case */ if (entry->direction == DMA_TO_DEVICE) return; |
0abdd7a81 dma-debug: introd... |
525 |
spin_lock_irqsave(&radix_lock, flags); |
59f2e7df5 dma-debug: fix ov... |
526 |
/* since we are counting overlaps the final put of the |
3b7a6418c dma debug: accoun... |
527 528 |
* cacheline will occur when the overlap count is 0. * active_cacheline_dec_overlap() returns -1 in that case |
59f2e7df5 dma-debug: fix ov... |
529 |
*/ |
3b7a6418c dma debug: accoun... |
530 531 |
if (active_cacheline_dec_overlap(cln) < 0) radix_tree_delete(&dma_active_cacheline, cln); |
0abdd7a81 dma-debug: introd... |
532 533 534 535 536 |
spin_unlock_irqrestore(&radix_lock, flags); } /** * debug_dma_assert_idle() - assert that a page is not undergoing dma |
3b7a6418c dma debug: accoun... |
537 |
* @page: page to lookup in the dma_active_cacheline tree |
0abdd7a81 dma-debug: introd... |
538 539 540 541 542 543 544 |
* * Place a call to this routine in cases where the cpu touching the page * before the dma completes (page is dma_unmapped) will lead to data * corruption. */ void debug_dma_assert_idle(struct page *page) { |
3b7a6418c dma debug: accoun... |
545 546 547 548 |
static struct dma_debug_entry *ents[CACHELINES_PER_PAGE]; struct dma_debug_entry *entry = NULL; void **results = (void **) &ents; unsigned int nents, i; |
0abdd7a81 dma-debug: introd... |
549 |
unsigned long flags; |
3b7a6418c dma debug: accoun... |
550 |
phys_addr_t cln; |
0abdd7a81 dma-debug: introd... |
551 |
|
c9d120b0b dma-debug: skip d... |
552 553 |
if (dma_debug_disabled()) return; |
0abdd7a81 dma-debug: introd... |
554 555 |
if (!page) return; |
3b7a6418c dma debug: accoun... |
556 |
cln = (phys_addr_t) page_to_pfn(page) << CACHELINE_PER_PAGE_SHIFT; |
0abdd7a81 dma-debug: introd... |
557 |
spin_lock_irqsave(&radix_lock, flags); |
3b7a6418c dma debug: accoun... |
558 559 560 561 562 563 564 565 566 567 568 |
nents = radix_tree_gang_lookup(&dma_active_cacheline, results, cln, CACHELINES_PER_PAGE); for (i = 0; i < nents; i++) { phys_addr_t ent_cln = to_cacheline_number(ents[i]); if (ent_cln == cln) { entry = ents[i]; break; } else if (ent_cln >= cln + CACHELINES_PER_PAGE) break; } |
0abdd7a81 dma-debug: introd... |
569 570 571 572 |
spin_unlock_irqrestore(&radix_lock, flags); if (!entry) return; |
3b7a6418c dma debug: accoun... |
573 |
cln = to_cacheline_number(entry); |
0abdd7a81 dma-debug: introd... |
574 |
err_printk(entry->dev, entry, |
3b7a6418c dma debug: accoun... |
575 576 577 |
"DMA-API: cpu touching an active dma mapped cacheline [cln=%pa] ", &cln); |
0abdd7a81 dma-debug: introd... |
578 579 580 |
} /* |
30dfa90cc dma-debug: add ha... |
581 582 583 584 585 586 587 |
* 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; |
0abdd7a81 dma-debug: introd... |
588 |
int rc; |
30dfa90cc dma-debug: add ha... |
589 590 591 592 |
bucket = get_hash_bucket(entry, &flags); hash_bucket_add(bucket, entry); put_hash_bucket(bucket, &flags); |
0abdd7a81 dma-debug: introd... |
593 |
|
3b7a6418c dma debug: accoun... |
594 |
rc = active_cacheline_insert(entry); |
0abdd7a81 dma-debug: introd... |
595 |
if (rc == -ENOMEM) { |
3b7a6418c dma debug: accoun... |
596 597 |
pr_err("DMA-API: cacheline tracking ENOMEM, dma-debug disabled "); |
0abdd7a81 dma-debug: introd... |
598 599 600 601 602 603 |
global_disable = true; } /* TODO: report -EEXIST errors here as overlapping mappings are * not supported by the DMA API */ |
30dfa90cc dma-debug: add ha... |
604 |
} |
e6a1a89d5 dma-debug: add dm... |
605 606 607 608 609 610 611 612 613 614 615 616 617 618 |
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; } |
3b1e79ed7 dma-debug: add al... |
619 620 621 622 623 624 625 |
/* 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) { |
29cdd4e4e dma-debug: releas... |
626 |
struct dma_debug_entry *entry; |
3b1e79ed7 dma-debug: add al... |
627 628 629 630 631 |
unsigned long flags; spin_lock_irqsave(&free_entries_lock, flags); if (list_empty(&free_entries)) { |
3b1e79ed7 dma-debug: add al... |
632 |
global_disable = true; |
29cdd4e4e dma-debug: releas... |
633 |
spin_unlock_irqrestore(&free_entries_lock, flags); |
3017cd63f dma-debug: avoid ... |
634 635 |
pr_err("DMA-API: debugging out of memory - disabling "); |
29cdd4e4e dma-debug: releas... |
636 |
return NULL; |
3b1e79ed7 dma-debug: add al... |
637 |
} |
e6a1a89d5 dma-debug: add dm... |
638 |
entry = __dma_entry_alloc(); |
3b1e79ed7 dma-debug: add al... |
639 |
|
29cdd4e4e dma-debug: releas... |
640 |
spin_unlock_irqrestore(&free_entries_lock, flags); |
6c132d1bc dma-debug: print ... |
641 642 643 644 645 646 |
#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 |
3b1e79ed7 dma-debug: add al... |
647 |
|
3b1e79ed7 dma-debug: add al... |
648 649 650 651 652 653 |
return entry; } static void dma_entry_free(struct dma_debug_entry *entry) { unsigned long flags; |
3b7a6418c dma debug: accoun... |
654 |
active_cacheline_remove(entry); |
0abdd7a81 dma-debug: introd... |
655 |
|
3b1e79ed7 dma-debug: add al... |
656 657 658 659 660 661 662 663 664 |
/* * 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); } |
e6a1a89d5 dma-debug: add dm... |
665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 |
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); |
6bf078715 dma-debug: add in... |
711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 |
/* * 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; |
e7ed70eed dma-debug: use pr... |
734 735 |
pr_info("DMA-API: preallocated %d debug entries ", num_entries); |
6bf078715 dma-debug: add in... |
736 737 738 739 740 741 742 743 744 745 746 747 |
return 0; out_err: list_for_each_entry_safe(entry, next_entry, &free_entries, list) { list_del(&entry->list); kfree(entry); } return -ENOMEM; } |
8a6fc708b dma-debug: add de... |
748 749 750 |
static ssize_t filter_read(struct file *file, char __user *user_buf, size_t count, loff_t *ppos) { |
8a6fc708b dma-debug: add de... |
751 |
char buf[NAME_MAX_LEN + 1]; |
c17e2cf73 dma-debug: code s... |
752 |
unsigned long flags; |
8a6fc708b dma-debug: add de... |
753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 |
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) { |
8a6fc708b dma-debug: add de... |
774 |
char buf[NAME_MAX_LEN]; |
c17e2cf73 dma-debug: code s... |
775 776 |
unsigned long flags; size_t len; |
8a6fc708b dma-debug: add de... |
777 778 779 780 781 782 783 784 |
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 */ |
e7ed70eed dma-debug: use pr... |
785 |
len = min(count, (size_t)(NAME_MAX_LEN - 1)); |
8a6fc708b dma-debug: add de... |
786 787 788 789 790 791 |
if (copy_from_user(buf, userbuf, len)) return -EFAULT; buf[len] = 0; write_lock_irqsave(&driver_name_lock, flags); |
312325094 dma-debug: commen... |
792 793 |
/* * Now handle the string we got from userspace very carefully. |
8a6fc708b dma-debug: add de... |
794 795 796 797 798 799 800 801 802 |
* The rules are: * - only use the first token we got * - token delimiter is everything looking like a space * character (' ', ' ', '\t' ...) * */ if (!isalnum(buf[0])) { /* |
312325094 dma-debug: commen... |
803 |
* If the first character userspace gave us is not |
8a6fc708b dma-debug: add de... |
804 805 806 807 |
* alphanumerical then assume the filter should be * switched off. */ if (current_driver_name[0]) |
e7ed70eed dma-debug: use pr... |
808 809 |
pr_info("DMA-API: switching off dma-debug driver filter "); |
8a6fc708b dma-debug: add de... |
810 811 812 813 814 815 816 817 818 |
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. */ |
39a37ce1c dma-debug: Cleanu... |
819 |
for (i = 0; i < NAME_MAX_LEN - 1; ++i) { |
8a6fc708b dma-debug: add de... |
820 821 822 823 824 825 |
current_driver_name[i] = buf[i]; if (isspace(buf[i]) || buf[i] == ' ' || buf[i] == 0) break; } current_driver_name[i] = 0; current_driver = NULL; |
e7ed70eed dma-debug: use pr... |
826 827 828 |
pr_info("DMA-API: enable driver filter for driver [%s] ", current_driver_name); |
8a6fc708b dma-debug: add de... |
829 830 831 832 833 834 |
out_unlock: write_unlock_irqrestore(&driver_name_lock, flags); return count; } |
aeb583d08 lib/dma-debug.c: ... |
835 |
static const struct file_operations filter_fops = { |
8a6fc708b dma-debug: add de... |
836 837 |
.read = filter_read, .write = filter_write, |
6038f373a llseek: automatic... |
838 |
.llseek = default_llseek, |
8a6fc708b dma-debug: add de... |
839 |
}; |
788dcfa6f dma-debug: add de... |
840 841 842 843 |
static int dma_debug_fs_init(void) { dma_debug_dent = debugfs_create_dir("dma-api", NULL); if (!dma_debug_dent) { |
e7ed70eed dma-debug: use pr... |
844 845 |
pr_err("DMA-API: can not create debugfs directory "); |
788dcfa6f dma-debug: add de... |
846 847 848 849 850 |
return -ENOMEM; } global_disable_dent = debugfs_create_bool("disabled", 0444, dma_debug_dent, |
68ee6d223 dma-debug: debugf... |
851 |
&global_disable); |
788dcfa6f dma-debug: add de... |
852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 |
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; |
8a6fc708b dma-debug: add de... |
883 884 885 886 |
filter_dent = debugfs_create_file("driver_filter", 0644, dma_debug_dent, NULL, &filter_fops); if (!filter_dent) goto out_err; |
788dcfa6f dma-debug: add de... |
887 888 889 890 891 892 893 |
return 0; out_err: debugfs_remove_recursive(dma_debug_dent); return -ENOMEM; } |
ba4b87ad5 dma-debug: print ... |
894 |
static int device_dma_allocations(struct device *dev, struct dma_debug_entry **out_entry) |
ed888aef4 dma-debug: re-add... |
895 896 897 898 899 900 |
{ struct dma_debug_entry *entry; unsigned long flags; int count = 0, i; for (i = 0; i < HASH_SIZE; ++i) { |
6a5cd60ba lib/dma-debug.c: ... |
901 |
spin_lock_irqsave(&dma_entry_hash[i].lock, flags); |
ed888aef4 dma-debug: re-add... |
902 |
list_for_each_entry(entry, &dma_entry_hash[i].list, list) { |
ba4b87ad5 dma-debug: print ... |
903 |
if (entry->dev == dev) { |
ed888aef4 dma-debug: re-add... |
904 |
count += 1; |
ba4b87ad5 dma-debug: print ... |
905 906 |
*out_entry = entry; } |
ed888aef4 dma-debug: re-add... |
907 |
} |
6a5cd60ba lib/dma-debug.c: ... |
908 |
spin_unlock_irqrestore(&dma_entry_hash[i].lock, flags); |
ed888aef4 dma-debug: re-add... |
909 910 911 912 |
} return count; } |
a8fe9ea20 dma-debug: Fix bu... |
913 |
static int dma_debug_device_change(struct notifier_block *nb, unsigned long action, void *data) |
ed888aef4 dma-debug: re-add... |
914 915 |
{ struct device *dev = data; |
ba4b87ad5 dma-debug: print ... |
916 |
struct dma_debug_entry *uninitialized_var(entry); |
ed888aef4 dma-debug: re-add... |
917 |
int count; |
01ce18b31 dma-debug: introd... |
918 |
if (dma_debug_disabled()) |
a8fe9ea20 dma-debug: Fix bu... |
919 |
return 0; |
ed888aef4 dma-debug: re-add... |
920 921 922 |
switch (action) { case BUS_NOTIFY_UNBOUND_DRIVER: |
ba4b87ad5 dma-debug: print ... |
923 |
count = device_dma_allocations(dev, &entry); |
ed888aef4 dma-debug: re-add... |
924 925 |
if (count == 0) break; |
ba4b87ad5 dma-debug: print ... |
926 |
err_printk(dev, entry, "DMA-API: device driver has pending " |
ed888aef4 dma-debug: re-add... |
927 |
"DMA allocations while released from device " |
ba4b87ad5 dma-debug: print ... |
928 929 930 931 932 933 934 935 |
"[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... |
936 937 938 939 940 941 942 |
break; default: break; } return 0; } |
41531c8f5 dma-debug: add a ... |
943 944 |
void dma_debug_add_bus(struct bus_type *bus) { |
ed888aef4 dma-debug: re-add... |
945 |
struct notifier_block *nb; |
01ce18b31 dma-debug: introd... |
946 |
if (dma_debug_disabled()) |
f797d9881 dma-debug: Do not... |
947 |
return; |
ed888aef4 dma-debug: re-add... |
948 949 |
nb = kzalloc(sizeof(struct notifier_block), GFP_KERNEL); if (nb == NULL) { |
e7ed70eed dma-debug: use pr... |
950 951 |
pr_err("dma_debug_add_bus: out of memory "); |
ed888aef4 dma-debug: re-add... |
952 953 954 955 956 957 |
return; } nb->notifier_call = dma_debug_device_change; bus_register_notifier(bus, nb); |
41531c8f5 dma-debug: add a ... |
958 |
} |
788dcfa6f dma-debug: add de... |
959 |
|
6bf078715 dma-debug: add in... |
960 961 962 963 964 965 |
/* * Let the architectures decide how many entries should be preallocated. */ void dma_debug_init(u32 num_entries) { int i; |
2ce8e7ed0 dma-debug: preven... |
966 967 968 969 |
/* Do not use dma_debug_initialized here, since we really want to be * called to set dma_debug_initialized */ if (global_disable) |
6bf078715 dma-debug: add in... |
970 971 972 973 |
return; for (i = 0; i < HASH_SIZE; ++i) { INIT_LIST_HEAD(&dma_entry_hash[i].list); |
b0a5b83ee dma-debug: Put al... |
974 |
spin_lock_init(&dma_entry_hash[i].lock); |
6bf078715 dma-debug: add in... |
975 |
} |
788dcfa6f dma-debug: add de... |
976 |
if (dma_debug_fs_init() != 0) { |
e7ed70eed dma-debug: use pr... |
977 978 |
pr_err("DMA-API: error creating debugfs entries - disabling "); |
788dcfa6f dma-debug: add de... |
979 980 981 982 |
global_disable = true; return; } |
59d3daafa dma-debug: add ke... |
983 984 |
if (req_entries) num_entries = req_entries; |
6bf078715 dma-debug: add in... |
985 |
if (prealloc_memory(num_entries) != 0) { |
e7ed70eed dma-debug: use pr... |
986 987 |
pr_err("DMA-API: debugging out of memory error - disabled "); |
6bf078715 dma-debug: add in... |
988 989 990 991 |
global_disable = true; return; } |
e6a1a89d5 dma-debug: add dm... |
992 |
nr_total_entries = num_free_entries; |
2ce8e7ed0 dma-debug: preven... |
993 |
dma_debug_initialized = true; |
e7ed70eed dma-debug: use pr... |
994 995 |
pr_info("DMA-API: debugging enabled by kernel config "); |
6bf078715 dma-debug: add in... |
996 |
} |
59d3daafa dma-debug: add ke... |
997 998 999 1000 1001 1002 |
static __init int dma_debug_cmdline(char *str) { if (!str) return -EINVAL; if (strncmp(str, "off", 3) == 0) { |
e7ed70eed dma-debug: use pr... |
1003 1004 |
pr_info("DMA-API: debugging disabled on kernel command line "); |
59d3daafa dma-debug: add ke... |
1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 |
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... |
1028 1029 1030 1031 1032 |
static void check_unmap(struct dma_debug_entry *ref) { struct dma_debug_entry *entry; struct hash_bucket *bucket; unsigned long flags; |
2d62ece14 dma-debug: add co... |
1033 |
bucket = get_hash_bucket(ref, &flags); |
c6a21d0b8 dma-debug: hash_b... |
1034 |
entry = bucket_find_exact(bucket, ref); |
2d62ece14 dma-debug: add co... |
1035 1036 |
if (!entry) { |
8d640a51e dma-debug: fix lo... |
1037 1038 |
/* must drop lock before calling dma_mapping_error */ put_hash_bucket(bucket, &flags); |
bfe0fb0f1 dma-debug: fix to... |
1039 1040 |
if (dma_mapping_error(ref->dev, ref->dev_addr)) { err_printk(ref->dev, NULL, |
8d640a51e dma-debug: fix lo... |
1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 |
"DMA-API: device driver tries to free an " "invalid DMA memory address "); } else { err_printk(ref->dev, NULL, "DMA-API: device driver tries to free DMA " "memory it has not allocated [device " "address=0x%016llx] [size=%llu bytes] ", ref->dev_addr, ref->size); |
bfe0fb0f1 dma-debug: fix to... |
1051 |
} |
8d640a51e dma-debug: fix lo... |
1052 |
return; |
2d62ece14 dma-debug: add co... |
1053 1054 1055 |
} if (ref->size != entry->size) { |
6c132d1bc dma-debug: print ... |
1056 |
err_printk(ref->dev, entry, "DMA-API: device driver frees " |
2d62ece14 dma-debug: add co... |
1057 1058 1059 1060 1061 1062 1063 1064 |
"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 ... |
1065 |
err_printk(ref->dev, entry, "DMA-API: device driver frees " |
2d62ece14 dma-debug: add co... |
1066 1067 1068 1069 1070 1071 1072 |
"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) && |
0abdd7a81 dma-debug: introd... |
1073 |
(phys_addr(ref) != phys_addr(entry))) { |
6c132d1bc dma-debug: print ... |
1074 |
err_printk(ref->dev, entry, "DMA-API: device driver frees " |
2d62ece14 dma-debug: add co... |
1075 1076 |
"DMA memory with different CPU address " "[device address=0x%016llx] [size=%llu bytes] " |
59a40e704 dma-debug: Fix co... |
1077 1078 |
"[cpu alloc address=0x%016llx] " "[cpu free address=0x%016llx]", |
2d62ece14 dma-debug: add co... |
1079 |
ref->dev_addr, ref->size, |
0abdd7a81 dma-debug: introd... |
1080 1081 |
phys_addr(entry), phys_addr(ref)); |
2d62ece14 dma-debug: add co... |
1082 1083 1084 1085 |
} if (ref->sg_call_ents && ref->type == dma_debug_sg && ref->sg_call_ents != entry->sg_call_ents) { |
6c132d1bc dma-debug: print ... |
1086 |
err_printk(ref->dev, entry, "DMA-API: device driver frees " |
2d62ece14 dma-debug: add co... |
1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 |
"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 ... |
1098 |
err_printk(ref->dev, entry, "DMA-API: device driver frees " |
2d62ece14 dma-debug: add co... |
1099 1100 1101 1102 1103 1104 1105 1106 |
"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]); } |
a5759b2bf dma-debug: add co... |
1107 1108 1109 1110 1111 |
/* * Drivers should use dma_mapping_error() to check the returned * addresses of dma_map_single() and dma_map_page(). * If not, print this warning message. See Documentation/DMA-API.txt. */ |
6c9c6d630 dma-debug: New in... |
1112 1113 1114 1115 1116 1117 1118 1119 |
if (entry->map_err_type == MAP_ERR_NOT_CHECKED) { err_printk(ref->dev, entry, "DMA-API: device driver failed to check map error" "[device address=0x%016llx] [size=%llu bytes] " "[mapped as %s]", ref->dev_addr, ref->size, type2name[entry->type]); } |
2d62ece14 dma-debug: add co... |
1120 1121 |
hash_bucket_del(entry); dma_entry_free(entry); |
2d62ece14 dma-debug: add co... |
1122 1123 |
put_hash_bucket(bucket, &flags); } |
b4a0f533e dma-api: Teach th... |
1124 1125 |
static void check_for_stack(struct device *dev, struct page *page, size_t offset) |
2d62ece14 dma-debug: add co... |
1126 |
{ |
b4a0f533e dma-api: Teach th... |
1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 |
void *addr; struct vm_struct *stack_vm_area = task_stack_vm_area(current); if (!stack_vm_area) { /* Stack is direct-mapped. */ if (PageHighMem(page)) return; addr = page_address(page) + offset; if (object_is_on_stack(addr)) err_printk(dev, NULL, "DMA-API: device driver maps memory from stack [addr=%p] ", addr); } else { /* Stack is vmalloced. */ int i; for (i = 0; i < stack_vm_area->nr_pages; i++) { if (page != stack_vm_area->pages[i]) continue; addr = (u8 *)current->stack + i * PAGE_SIZE + offset; err_printk(dev, NULL, "DMA-API: device driver maps memory from stack [probable addr=%p] ", addr); break; } } |
2d62ece14 dma-debug: add co... |
1152 |
} |
f39d1b979 dma-debug: Fix th... |
1153 |
static inline bool overlap(void *addr, unsigned long len, void *start, void *end) |
2e34bde18 dma-debug: add ch... |
1154 |
{ |
f39d1b979 dma-debug: Fix th... |
1155 1156 1157 1158 |
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... |
1159 |
|
f39d1b979 dma-debug: Fix th... |
1160 |
return !(b1 <= a2 || a1 >= b2); |
2e34bde18 dma-debug: add ch... |
1161 |
} |
f39d1b979 dma-debug: Fix th... |
1162 |
static void check_for_illegal_area(struct device *dev, void *addr, unsigned long len) |
2e34bde18 dma-debug: add ch... |
1163 |
{ |
ea535e418 dma-debug: switch... |
1164 |
if (overlap(addr, len, _stext, _etext) || |
f39d1b979 dma-debug: Fix th... |
1165 1166 1167 |
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... |
1168 |
} |
aa010efb7 dma-debug: be mor... |
1169 1170 1171 |
static void check_sync(struct device *dev, struct dma_debug_entry *ref, bool to_cpu) |
2d62ece14 dma-debug: add co... |
1172 |
{ |
2d62ece14 dma-debug: add co... |
1173 1174 1175 |
struct dma_debug_entry *entry; struct hash_bucket *bucket; unsigned long flags; |
aa010efb7 dma-debug: be mor... |
1176 |
bucket = get_hash_bucket(ref, &flags); |
2d62ece14 dma-debug: add co... |
1177 |
|
c6a21d0b8 dma-debug: hash_b... |
1178 |
entry = bucket_find_contain(&bucket, ref, &flags); |
2d62ece14 dma-debug: add co... |
1179 1180 |
if (!entry) { |
6c132d1bc dma-debug: print ... |
1181 |
err_printk(dev, NULL, "DMA-API: device driver tries " |
2d62ece14 dma-debug: add co... |
1182 1183 1184 |
"to sync DMA memory it has not allocated " "[device address=0x%016llx] [size=%llu bytes] ", |
aa010efb7 dma-debug: be mor... |
1185 |
(unsigned long long)ref->dev_addr, ref->size); |
2d62ece14 dma-debug: add co... |
1186 1187 |
goto out; } |
aa010efb7 dma-debug: be mor... |
1188 |
if (ref->size > entry->size) { |
6c132d1bc dma-debug: print ... |
1189 |
err_printk(dev, entry, "DMA-API: device driver syncs" |
2d62ece14 dma-debug: add co... |
1190 1191 |
" DMA memory outside allocated range " "[device address=0x%016llx] " |
aa010efb7 dma-debug: be mor... |
1192 1193 1194 1195 1196 |
"[allocation size=%llu bytes] " "[sync offset+size=%llu] ", entry->dev_addr, entry->size, ref->size); |
2d62ece14 dma-debug: add co... |
1197 |
} |
42d53b4ff dma-debug: allow ... |
1198 1199 |
if (entry->direction == DMA_BIDIRECTIONAL) goto out; |
aa010efb7 dma-debug: be mor... |
1200 |
if (ref->direction != entry->direction) { |
6c132d1bc dma-debug: print ... |
1201 |
err_printk(dev, entry, "DMA-API: device driver syncs " |
2d62ece14 dma-debug: add co... |
1202 1203 1204 1205 |
"DMA memory with different direction " "[device address=0x%016llx] [size=%llu bytes] " "[mapped with %s] [synced with %s] ", |
aa010efb7 dma-debug: be mor... |
1206 |
(unsigned long long)ref->dev_addr, entry->size, |
2d62ece14 dma-debug: add co... |
1207 |
dir2name[entry->direction], |
aa010efb7 dma-debug: be mor... |
1208 |
dir2name[ref->direction]); |
2d62ece14 dma-debug: add co... |
1209 |
} |
2d62ece14 dma-debug: add co... |
1210 |
if (to_cpu && !(entry->direction == DMA_FROM_DEVICE) && |
aa010efb7 dma-debug: be mor... |
1211 |
!(ref->direction == DMA_TO_DEVICE)) |
6c132d1bc dma-debug: print ... |
1212 |
err_printk(dev, entry, "DMA-API: device driver syncs " |
2d62ece14 dma-debug: add co... |
1213 1214 1215 1216 |
"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... |
1217 |
(unsigned long long)ref->dev_addr, entry->size, |
2d62ece14 dma-debug: add co... |
1218 |
dir2name[entry->direction], |
aa010efb7 dma-debug: be mor... |
1219 |
dir2name[ref->direction]); |
2d62ece14 dma-debug: add co... |
1220 1221 |
if (!to_cpu && !(entry->direction == DMA_TO_DEVICE) && |
aa010efb7 dma-debug: be mor... |
1222 |
!(ref->direction == DMA_FROM_DEVICE)) |
6c132d1bc dma-debug: print ... |
1223 |
err_printk(dev, entry, "DMA-API: device driver syncs " |
2d62ece14 dma-debug: add co... |
1224 1225 1226 1227 |
"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... |
1228 |
(unsigned long long)ref->dev_addr, entry->size, |
2d62ece14 dma-debug: add co... |
1229 |
dir2name[entry->direction], |
aa010efb7 dma-debug: be mor... |
1230 |
dir2name[ref->direction]); |
2d62ece14 dma-debug: add co... |
1231 |
|
7f8306429 dma-debug: check ... |
1232 1233 1234 1235 1236 1237 1238 1239 |
if (ref->sg_call_ents && ref->type == dma_debug_sg && ref->sg_call_ents != entry->sg_call_ents) { err_printk(ref->dev, entry, "DMA-API: device driver syncs " "DMA sg list with different entry count " "[map count=%d] [sync count=%d] ", entry->sg_call_ents, ref->sg_call_ents); } |
2d62ece14 dma-debug: add co... |
1240 1241 |
out: put_hash_bucket(bucket, &flags); |
2d62ece14 dma-debug: add co... |
1242 |
} |
f62bc980e dma-debug: add ch... |
1243 1244 1245 1246 1247 |
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; |
01ce18b31 dma-debug: introd... |
1248 |
if (unlikely(dma_debug_disabled())) |
f62bc980e dma-debug: add ch... |
1249 |
return; |
bfe0fb0f1 dma-debug: fix to... |
1250 |
if (dma_mapping_error(dev, dma_addr)) |
f62bc980e dma-debug: add ch... |
1251 1252 1253 1254 1255 1256 1257 1258 |
return; entry = dma_entry_alloc(); if (!entry) return; entry->dev = dev; entry->type = dma_debug_page; |
0abdd7a81 dma-debug: introd... |
1259 1260 |
entry->pfn = page_to_pfn(page); entry->offset = offset, |
f62bc980e dma-debug: add ch... |
1261 1262 1263 |
entry->dev_addr = dma_addr; entry->size = size; entry->direction = direction; |
6c9c6d630 dma-debug: New in... |
1264 |
entry->map_err_type = MAP_ERR_NOT_CHECKED; |
f62bc980e dma-debug: add ch... |
1265 |
|
9537a48ed dma-debug: make m... |
1266 |
if (map_single) |
f62bc980e dma-debug: add ch... |
1267 |
entry->type = dma_debug_single; |
9537a48ed dma-debug: make m... |
1268 |
|
b4a0f533e dma-api: Teach th... |
1269 |
check_for_stack(dev, page, offset); |
9537a48ed dma-debug: make m... |
1270 |
if (!PageHighMem(page)) { |
f39d1b979 dma-debug: Fix th... |
1271 |
void *addr = page_address(page) + offset; |
2e34bde18 dma-debug: add ch... |
1272 |
check_for_illegal_area(dev, addr, size); |
f62bc980e dma-debug: add ch... |
1273 1274 1275 1276 1277 |
} add_dma_entry(entry); } EXPORT_SYMBOL(debug_dma_map_page); |
6c9c6d630 dma-debug: New in... |
1278 1279 1280 1281 1282 1283 |
void debug_dma_mapping_error(struct device *dev, dma_addr_t dma_addr) { struct dma_debug_entry ref; struct dma_debug_entry *entry; struct hash_bucket *bucket; unsigned long flags; |
01ce18b31 dma-debug: introd... |
1284 |
if (unlikely(dma_debug_disabled())) |
6c9c6d630 dma-debug: New in... |
1285 1286 1287 1288 1289 |
return; ref.dev = dev; ref.dev_addr = dma_addr; bucket = get_hash_bucket(&ref, &flags); |
6c9c6d630 dma-debug: New in... |
1290 |
|
96e7d7a1e dma-debug: update... |
1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 |
list_for_each_entry(entry, &bucket->list, list) { if (!exact_match(&ref, entry)) continue; /* * The same physical address can be mapped 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 * positives being reported. Therefore we implement a * best-fit algorithm here which updates the first entry * from the hash which fits the reference value and is * not currently listed as being checked. */ if (entry->map_err_type == MAP_ERR_NOT_CHECKED) { entry->map_err_type = MAP_ERR_CHECKED; break; } } |
6c9c6d630 dma-debug: New in... |
1310 |
|
6c9c6d630 dma-debug: New in... |
1311 1312 1313 |
put_hash_bucket(bucket, &flags); } EXPORT_SYMBOL(debug_dma_mapping_error); |
f62bc980e dma-debug: add ch... |
1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 |
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, }; |
01ce18b31 dma-debug: introd... |
1324 |
if (unlikely(dma_debug_disabled())) |
f62bc980e dma-debug: add ch... |
1325 1326 1327 1328 1329 1330 1331 1332 |
return; if (map_single) ref.type = dma_debug_single; check_unmap(&ref); } EXPORT_SYMBOL(debug_dma_unmap_page); |
972aa45ce dma-debug: add ad... |
1333 1334 1335 1336 1337 1338 |
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; |
01ce18b31 dma-debug: introd... |
1339 |
if (unlikely(dma_debug_disabled())) |
972aa45ce dma-debug: add ad... |
1340 1341 1342 1343 1344 1345 1346 1347 1348 |
return; for_each_sg(sg, s, mapped_ents, i) { entry = dma_entry_alloc(); if (!entry) return; entry->type = dma_debug_sg; entry->dev = dev; |
0abdd7a81 dma-debug: introd... |
1349 1350 |
entry->pfn = page_to_pfn(sg_page(s)); entry->offset = s->offset, |
884d05970 dma-debug: use sg... |
1351 |
entry->size = sg_dma_len(s); |
15aedea43 dma-debug: use sg... |
1352 |
entry->dev_addr = sg_dma_address(s); |
972aa45ce dma-debug: add ad... |
1353 1354 1355 |
entry->direction = direction; entry->sg_call_ents = nents; entry->sg_mapped_ents = mapped_ents; |
b4a0f533e dma-api: Teach th... |
1356 |
check_for_stack(dev, sg_page(s), s->offset); |
9537a48ed dma-debug: make m... |
1357 |
if (!PageHighMem(sg_page(s))) { |
884d05970 dma-debug: use sg... |
1358 |
check_for_illegal_area(dev, sg_virt(s), sg_dma_len(s)); |
9537a48ed dma-debug: make m... |
1359 |
} |
972aa45ce dma-debug: add ad... |
1360 1361 1362 1363 1364 |
add_dma_entry(entry); } } EXPORT_SYMBOL(debug_dma_map_sg); |
aa010efb7 dma-debug: be mor... |
1365 1366 |
static int get_nr_mapped_entries(struct device *dev, struct dma_debug_entry *ref) |
88f3907f6 dma-debug: fix de... |
1367 |
{ |
aa010efb7 dma-debug: be mor... |
1368 |
struct dma_debug_entry *entry; |
88f3907f6 dma-debug: fix de... |
1369 1370 |
struct hash_bucket *bucket; unsigned long flags; |
c17e2cf73 dma-debug: code s... |
1371 |
int mapped_ents; |
88f3907f6 dma-debug: fix de... |
1372 |
|
aa010efb7 dma-debug: be mor... |
1373 |
bucket = get_hash_bucket(ref, &flags); |
c6a21d0b8 dma-debug: hash_b... |
1374 |
entry = bucket_find_exact(bucket, ref); |
c17e2cf73 dma-debug: code s... |
1375 |
mapped_ents = 0; |
88f3907f6 dma-debug: fix de... |
1376 |
|
88f3907f6 dma-debug: fix de... |
1377 1378 1379 1380 1381 1382 |
if (entry) mapped_ents = entry->sg_mapped_ents; put_hash_bucket(bucket, &flags); return mapped_ents; } |
972aa45ce dma-debug: add ad... |
1383 1384 1385 |
void debug_dma_unmap_sg(struct device *dev, struct scatterlist *sglist, int nelems, int dir) { |
972aa45ce dma-debug: add ad... |
1386 1387 |
struct scatterlist *s; int mapped_ents = 0, i; |
972aa45ce dma-debug: add ad... |
1388 |
|
01ce18b31 dma-debug: introd... |
1389 |
if (unlikely(dma_debug_disabled())) |
972aa45ce dma-debug: add ad... |
1390 1391 1392 1393 1394 1395 1396 |
return; for_each_sg(sglist, s, nelems, i) { struct dma_debug_entry ref = { .type = dma_debug_sg, .dev = dev, |
0abdd7a81 dma-debug: introd... |
1397 1398 |
.pfn = page_to_pfn(sg_page(s)), .offset = s->offset, |
15aedea43 dma-debug: use sg... |
1399 |
.dev_addr = sg_dma_address(s), |
884d05970 dma-debug: use sg... |
1400 |
.size = sg_dma_len(s), |
972aa45ce dma-debug: add ad... |
1401 |
.direction = dir, |
e5e8c5b90 dma-debug: check ... |
1402 |
.sg_call_ents = nelems, |
972aa45ce dma-debug: add ad... |
1403 1404 1405 1406 |
}; if (mapped_ents && i >= mapped_ents) break; |
e5e8c5b90 dma-debug: check ... |
1407 |
if (!i) |
aa010efb7 dma-debug: be mor... |
1408 |
mapped_ents = get_nr_mapped_entries(dev, &ref); |
972aa45ce dma-debug: add ad... |
1409 1410 1411 1412 1413 |
check_unmap(&ref); } } EXPORT_SYMBOL(debug_dma_unmap_sg); |
6bfd44987 dma-debug: add ch... |
1414 1415 1416 1417 |
void debug_dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t dma_addr, void *virt) { struct dma_debug_entry *entry; |
01ce18b31 dma-debug: introd... |
1418 |
if (unlikely(dma_debug_disabled())) |
6bfd44987 dma-debug: add ch... |
1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 |
return; if (unlikely(virt == NULL)) return; entry = dma_entry_alloc(); if (!entry) return; entry->type = dma_debug_coherent; entry->dev = dev; |
0abdd7a81 dma-debug: introd... |
1430 |
entry->pfn = page_to_pfn(virt_to_page(virt)); |
e57d05520 dma-debug: use of... |
1431 |
entry->offset = offset_in_page(virt); |
6bfd44987 dma-debug: add ch... |
1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 |
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, |
0abdd7a81 dma-debug: introd... |
1446 |
.pfn = page_to_pfn(virt_to_page(virt)), |
e57d05520 dma-debug: use of... |
1447 |
.offset = offset_in_page(virt), |
6bfd44987 dma-debug: add ch... |
1448 1449 1450 1451 |
.dev_addr = addr, .size = size, .direction = DMA_BIDIRECTIONAL, }; |
01ce18b31 dma-debug: introd... |
1452 |
if (unlikely(dma_debug_disabled())) |
6bfd44987 dma-debug: add ch... |
1453 1454 1455 1456 1457 |
return; check_unmap(&ref); } EXPORT_SYMBOL(debug_dma_free_coherent); |
0e74b34df dma-debug: add su... |
1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 |
void debug_dma_map_resource(struct device *dev, phys_addr_t addr, size_t size, int direction, dma_addr_t dma_addr) { struct dma_debug_entry *entry; if (unlikely(dma_debug_disabled())) return; entry = dma_entry_alloc(); if (!entry) return; entry->type = dma_debug_resource; entry->dev = dev; |
2e0cc304e dma-debug: fix ia... |
1472 |
entry->pfn = PHYS_PFN(addr); |
0e74b34df dma-debug: add su... |
1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 |
entry->offset = offset_in_page(addr); entry->size = size; entry->dev_addr = dma_addr; entry->direction = direction; entry->map_err_type = MAP_ERR_NOT_CHECKED; add_dma_entry(entry); } EXPORT_SYMBOL(debug_dma_map_resource); void debug_dma_unmap_resource(struct device *dev, dma_addr_t dma_addr, size_t size, int direction) { struct dma_debug_entry ref = { .type = dma_debug_resource, .dev = dev, .dev_addr = dma_addr, .size = size, .direction = direction, }; if (unlikely(dma_debug_disabled())) return; check_unmap(&ref); } EXPORT_SYMBOL(debug_dma_unmap_resource); |
b9d2317e0 dma-debug: add ch... |
1500 1501 1502 |
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... |
1503 |
struct dma_debug_entry ref; |
01ce18b31 dma-debug: introd... |
1504 |
if (unlikely(dma_debug_disabled())) |
b9d2317e0 dma-debug: add ch... |
1505 |
return; |
aa010efb7 dma-debug: be mor... |
1506 1507 1508 1509 1510 1511 1512 1513 |
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... |
1514 1515 1516 1517 1518 1519 1520 |
} 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... |
1521 |
struct dma_debug_entry ref; |
01ce18b31 dma-debug: introd... |
1522 |
if (unlikely(dma_debug_disabled())) |
b9d2317e0 dma-debug: add ch... |
1523 |
return; |
aa010efb7 dma-debug: be mor... |
1524 1525 1526 1527 1528 1529 1530 1531 |
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); |
b9d2317e0 dma-debug: add ch... |
1532 1533 |
} EXPORT_SYMBOL(debug_dma_sync_single_for_device); |
948408ba3 dma-debug: add ch... |
1534 1535 1536 1537 1538 |
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... |
1539 |
struct dma_debug_entry ref; |
01ce18b31 dma-debug: introd... |
1540 |
if (unlikely(dma_debug_disabled())) |
948408ba3 dma-debug: add ch... |
1541 |
return; |
aa010efb7 dma-debug: be mor... |
1542 1543 1544 1545 1546 1547 1548 1549 |
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... |
1550 1551 1552 1553 1554 1555 1556 1557 |
} 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... |
1558 |
struct dma_debug_entry ref; |
01ce18b31 dma-debug: introd... |
1559 |
if (unlikely(dma_debug_disabled())) |
948408ba3 dma-debug: add ch... |
1560 |
return; |
aa010efb7 dma-debug: be mor... |
1561 1562 1563 1564 1565 1566 1567 1568 |
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... |
1569 1570 |
} EXPORT_SYMBOL(debug_dma_sync_single_range_for_device); |
a31fba5d6 dma-debug: add ch... |
1571 1572 1573 1574 |
void debug_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems, int direction) { struct scatterlist *s; |
88f3907f6 dma-debug: fix de... |
1575 |
int mapped_ents = 0, i; |
a31fba5d6 dma-debug: add ch... |
1576 |
|
01ce18b31 dma-debug: introd... |
1577 |
if (unlikely(dma_debug_disabled())) |
a31fba5d6 dma-debug: add ch... |
1578 1579 1580 |
return; for_each_sg(sg, s, nelems, i) { |
aa010efb7 dma-debug: be mor... |
1581 1582 1583 1584 |
struct dma_debug_entry ref = { .type = dma_debug_sg, .dev = dev, |
0abdd7a81 dma-debug: introd... |
1585 1586 |
.pfn = page_to_pfn(sg_page(s)), .offset = s->offset, |
aa010efb7 dma-debug: be mor... |
1587 1588 1589 1590 1591 |
.dev_addr = sg_dma_address(s), .size = sg_dma_len(s), .direction = direction, .sg_call_ents = nelems, }; |
88f3907f6 dma-debug: fix de... |
1592 |
if (!i) |
aa010efb7 dma-debug: be mor... |
1593 |
mapped_ents = get_nr_mapped_entries(dev, &ref); |
88f3907f6 dma-debug: fix de... |
1594 1595 1596 |
if (i >= mapped_ents) break; |
aa010efb7 dma-debug: be mor... |
1597 |
check_sync(dev, &ref, true); |
a31fba5d6 dma-debug: add ch... |
1598 1599 1600 1601 1602 1603 1604 1605 |
} } 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... |
1606 |
int mapped_ents = 0, i; |
a31fba5d6 dma-debug: add ch... |
1607 |
|
01ce18b31 dma-debug: introd... |
1608 |
if (unlikely(dma_debug_disabled())) |
a31fba5d6 dma-debug: add ch... |
1609 1610 1611 |
return; for_each_sg(sg, s, nelems, i) { |
aa010efb7 dma-debug: be mor... |
1612 1613 1614 1615 |
struct dma_debug_entry ref = { .type = dma_debug_sg, .dev = dev, |
0abdd7a81 dma-debug: introd... |
1616 1617 |
.pfn = page_to_pfn(sg_page(s)), .offset = s->offset, |
aa010efb7 dma-debug: be mor... |
1618 1619 1620 1621 1622 |
.dev_addr = sg_dma_address(s), .size = sg_dma_len(s), .direction = direction, .sg_call_ents = nelems, }; |
88f3907f6 dma-debug: fix de... |
1623 |
if (!i) |
aa010efb7 dma-debug: be mor... |
1624 |
mapped_ents = get_nr_mapped_entries(dev, &ref); |
88f3907f6 dma-debug: fix de... |
1625 1626 1627 |
if (i >= mapped_ents) break; |
aa010efb7 dma-debug: be mor... |
1628 |
check_sync(dev, &ref, false); |
a31fba5d6 dma-debug: add ch... |
1629 1630 1631 |
} } EXPORT_SYMBOL(debug_dma_sync_sg_for_device); |
1745de5e5 dma-debug: add dm... |
1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 |
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... |
1643 1644 1645 |
pr_info("DMA-API: enable driver filter for driver [%s] ", current_driver_name); |
1745de5e5 dma-debug: add dm... |
1646 1647 1648 1649 1650 |
return 1; } __setup("dma_debug_driver=", dma_debug_driver_setup); |