+++ /dev/null
-/*
- * 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
- */
-
-#include <linux/sched/task_stack.h>
-#include <linux/scatterlist.h>
-#include <linux/dma-mapping.h>
-#include <linux/sched/task.h>
-#include <linux/stacktrace.h>
-#include <linux/dma-debug.h>
-#include <linux/spinlock.h>
-#include <linux/vmalloc.h>
-#include <linux/debugfs.h>
-#include <linux/uaccess.h>
-#include <linux/export.h>
-#include <linux/device.h>
-#include <linux/types.h>
-#include <linux/sched.h>
-#include <linux/ctype.h>
-#include <linux/list.h>
-#include <linux/slab.h>
-
-#include <asm/sections.h>
-
-#define HASH_SIZE 1024ULL
-#define HASH_FN_SHIFT 13
-#define HASH_FN_MASK (HASH_SIZE - 1)
-
-/* allow architectures to override this if absolutely required */
-#ifndef PREALLOC_DMA_DEBUG_ENTRIES
-#define PREALLOC_DMA_DEBUG_ENTRIES (1 << 16)
-#endif
-
-enum {
- dma_debug_single,
- dma_debug_page,
- dma_debug_sg,
- dma_debug_coherent,
- dma_debug_resource,
-};
-
-enum map_err_types {
- MAP_ERR_CHECK_NOT_APPLICABLE,
- MAP_ERR_NOT_CHECKED,
- MAP_ERR_CHECKED,
-};
-
-#define DMA_DEBUG_STACKTRACE_ENTRIES 5
-
-/**
- * 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
- */
-struct dma_debug_entry {
- struct list_head list;
- struct device *dev;
- int type;
- unsigned long pfn;
- size_t offset;
- u64 dev_addr;
- u64 size;
- int direction;
- int sg_call_ents;
- int sg_mapped_ents;
- enum map_err_types map_err_type;
-#ifdef CONFIG_STACKTRACE
- struct stack_trace stacktrace;
- unsigned long st_entries[DMA_DEBUG_STACKTRACE_ENTRIES];
-#endif
-};
-
-typedef bool (*match_fn)(struct dma_debug_entry *, struct dma_debug_entry *);
-
-struct hash_bucket {
- struct list_head list;
- spinlock_t lock;
-} ____cacheline_aligned_in_smp;
-
-/* Hash list to save the allocated dma addresses */
-static struct hash_bucket dma_entry_hash[HASH_SIZE];
-/* 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;
-
-/* Early initialization disable flag, set at the end of dma_debug_init */
-static bool dma_debug_initialized __read_mostly;
-
-static inline bool dma_debug_disabled(void)
-{
- return global_disable || !dma_debug_initialized;
-}
-
-/* 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;
-
-static u32 num_free_entries;
-static u32 min_free_entries;
-static u32 nr_total_entries;
-
-/* number of preallocated entries requested by kernel cmdline */
-static u32 nr_prealloc_entries = PREALLOC_DMA_DEBUG_ENTRIES;
-
-/* 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;
-static struct dentry *filter_dent __read_mostly;
-
-/* 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);
-
-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",
-};
-
-static const char *type2name[5] = { "single", "page",
- "scather-gather", "coherent",
- "resource" };
-
-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.
- */
-static inline void dump_entry_trace(struct dma_debug_entry *entry)
-{
-#ifdef CONFIG_STACKTRACE
- if (entry) {
- pr_warning("Mapped at:\n");
- print_stack_trace(&entry->stacktrace, 0);
- }
-#endif
-}
-
-static bool driver_filter(struct device *dev)
-{
- struct device_driver *drv;
- unsigned long flags;
- bool ret;
-
- /* driver filter off */
- if (likely(!current_driver_name[0]))
- return true;
-
- /* driver filter on and initialized */
- if (current_driver && dev && dev->driver == current_driver)
- return true;
-
- /* driver filter on, but we can't filter on a NULL device... */
- if (!dev)
- return false;
-
- if (current_driver || !current_driver_name[0])
- return false;
-
- /* driver filter on but not yet initialized */
- drv = 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;
- }
-
- read_unlock_irqrestore(&driver_name_lock, flags);
-
- return ret;
-}
-
-#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; \
- } while (0);
-
-/*
- * 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)
- __acquires(&dma_entry_hash[idx].lock)
-{
- 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)
- __releases(&bucket->lock)
-{
- unsigned long __flags = *flags;
-
- spin_unlock_irqrestore(&bucket->lock, __flags);
-}
-
-static bool exact_match(struct dma_debug_entry *a, struct dma_debug_entry *b)
-{
- return ((a->dev_addr == b->dev_addr) &&
- (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;
-}
-
-/*
- * 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,
- match_fn match)
-{
- struct dma_debug_entry *entry, *ret = NULL;
- int matches = 0, match_lvl, last_lvl = -1;
-
- list_for_each_entry(entry, &bucket->list, list) {
- if (!match(ref, entry))
- 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
- * positives being reported. Therefore we implement a
- * 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;
- 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;
-
- if (match_lvl == 4) {
- /* perfect-fit - return the result */
- return entry;
- } else if (match_lvl > last_lvl) {
- /*
- * We found an entry that fits better then the
- * previous one or it is the 1st match.
- */
- last_lvl = match_lvl;
- ret = entry;
- }
- }
-
- /*
- * If we have multiple matches but no perfect-fit, just return
- * NULL.
- */
- ret = (matches == 1) ? ret : NULL;
-
- return ret;
-}
-
-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) {
- entry = __hash_bucket_find(*bucket, ref, containing_match);
-
- 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;
-}
-
-/*
- * 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);
-}
-
-static unsigned long long phys_addr(struct dma_debug_entry *entry)
-{
- if (entry->type == dma_debug_resource)
- return __pfn_to_phys(entry->pfn) + entry->offset;
-
- return page_to_phys(pfn_to_page(entry->pfn)) + entry->offset;
-}
-
-/*
- * 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 N=%lx D=%Lx L=%Lx %s %s\n",
- type2name[entry->type], idx,
- phys_addr(entry), entry->pfn,
- entry->dev_addr, entry->size,
- dir2name[entry->direction],
- maperr2str[entry->map_err_type]);
- }
- }
-
- spin_unlock_irqrestore(&bucket->lock, flags);
- }
-}
-
-/*
- * 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
- * dma_unmap_{single|sg|page} or dma_free_coherent delete the entry. If
- * the entry already exists at insertion time add a tag as a reference
- * count for the overlapping mappings. For now, the overlap tracking
- * just ensures that 'unmaps' balance 'maps' before marking the
- * cacheline idle, but we should also be flagging overlaps as an API
- * violation.
- *
- * Memory usage is mostly constrained by the maximum number of available
- * dma-debug entries in that we need a free dma_debug_entry before
- * 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.
- *
- * At any time debug_dma_assert_idle() can be called to trigger a
- * warning if any cachelines in the given page are in the active set.
- */
-static RADIX_TREE(dma_active_cacheline, GFP_NOWAIT);
-static DEFINE_SPINLOCK(radix_lock);
-#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)
-
-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)
-{
- int overlap = 0, i;
-
- for (i = RADIX_TREE_MAX_TAGS - 1; i >= 0; i--)
- if (radix_tree_tag_get(&dma_active_cacheline, cln, i))
- overlap |= 1 << i;
- return overlap;
-}
-
-static int active_cacheline_set_overlap(phys_addr_t cln, int overlap)
-{
- int i;
-
- if (overlap > ACTIVE_CACHELINE_MAX_OVERLAP || overlap < 0)
- return overlap;
-
- for (i = RADIX_TREE_MAX_TAGS - 1; i >= 0; i--)
- if (overlap & 1 << i)
- radix_tree_tag_set(&dma_active_cacheline, cln, i);
- else
- radix_tree_tag_clear(&dma_active_cacheline, cln, i);
-
- return overlap;
-}
-
-static void active_cacheline_inc_overlap(phys_addr_t cln)
-{
- int overlap = active_cacheline_read_overlap(cln);
-
- overlap = active_cacheline_set_overlap(cln, ++overlap);
-
- /* 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
- * debug_dma_assert_idle() as the cacheline may be marked idle
- * prematurely.
- */
- WARN_ONCE(overlap > ACTIVE_CACHELINE_MAX_OVERLAP,
- "DMA-API: exceeded %d overlapping mappings of cacheline %pa\n",
- ACTIVE_CACHELINE_MAX_OVERLAP, &cln);
-}
-
-static int active_cacheline_dec_overlap(phys_addr_t cln)
-{
- int overlap = active_cacheline_read_overlap(cln);
-
- return active_cacheline_set_overlap(cln, --overlap);
-}
-
-static int active_cacheline_insert(struct dma_debug_entry *entry)
-{
- phys_addr_t cln = to_cacheline_number(entry);
- unsigned long flags;
- int rc;
-
- /* 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;
-
- spin_lock_irqsave(&radix_lock, flags);
- rc = radix_tree_insert(&dma_active_cacheline, cln, entry);
- if (rc == -EEXIST)
- active_cacheline_inc_overlap(cln);
- spin_unlock_irqrestore(&radix_lock, flags);
-
- return rc;
-}
-
-static void active_cacheline_remove(struct dma_debug_entry *entry)
-{
- phys_addr_t cln = to_cacheline_number(entry);
- unsigned long flags;
-
- /* ...mirror the insert case */
- if (entry->direction == DMA_TO_DEVICE)
- return;
-
- spin_lock_irqsave(&radix_lock, flags);
- /* since we are counting overlaps the final put of the
- * cacheline will occur when the overlap count is 0.
- * active_cacheline_dec_overlap() returns -1 in that case
- */
- if (active_cacheline_dec_overlap(cln) < 0)
- radix_tree_delete(&dma_active_cacheline, cln);
- spin_unlock_irqrestore(&radix_lock, flags);
-}
-
-/**
- * debug_dma_assert_idle() - assert that a page is not undergoing dma
- * @page: page to lookup in the dma_active_cacheline tree
- *
- * 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)
-{
- static struct dma_debug_entry *ents[CACHELINES_PER_PAGE];
- struct dma_debug_entry *entry = NULL;
- void **results = (void **) &ents;
- unsigned int nents, i;
- unsigned long flags;
- phys_addr_t cln;
-
- if (dma_debug_disabled())
- return;
-
- if (!page)
- return;
-
- cln = (phys_addr_t) page_to_pfn(page) << CACHELINE_PER_PAGE_SHIFT;
- spin_lock_irqsave(&radix_lock, flags);
- 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;
- }
- spin_unlock_irqrestore(&radix_lock, flags);
-
- if (!entry)
- return;
-
- cln = to_cacheline_number(entry);
- err_printk(entry->dev, entry,
- "DMA-API: cpu touching an active dma mapped cacheline [cln=%pa]\n",
- &cln);
-}
-
-/*
- * 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;
- int rc;
-
- bucket = get_hash_bucket(entry, &flags);
- hash_bucket_add(bucket, entry);
- put_hash_bucket(bucket, &flags);
-
- rc = active_cacheline_insert(entry);
- if (rc == -ENOMEM) {
- pr_err("DMA-API: cacheline tracking ENOMEM, dma-debug disabled\n");
- global_disable = true;
- }
-
- /* TODO: report -EEXIST errors here as overlapping mappings are
- * not supported by the DMA API
- */
-}
-
-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;
-}
-
-/* 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;
- unsigned long flags;
-
- spin_lock_irqsave(&free_entries_lock, flags);
-
- if (list_empty(&free_entries)) {
- global_disable = true;
- spin_unlock_irqrestore(&free_entries_lock, flags);
- pr_err("DMA-API: debugging out of memory - disabling\n");
- return NULL;
- }
-
- entry = __dma_entry_alloc();
-
- spin_unlock_irqrestore(&free_entries_lock, flags);
-
-#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
-
- return entry;
-}
-
-static void dma_entry_free(struct dma_debug_entry *entry)
-{
- unsigned long flags;
-
- active_cacheline_remove(entry);
-
- /*
- * 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);
-}
-
-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;
-}
-
-/*
- * 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;
-
- pr_info("DMA-API: preallocated %d debug entries\n", num_entries);
-
- return 0;
-
-out_err:
-
- list_for_each_entry_safe(entry, next_entry, &free_entries, list) {
- list_del(&entry->list);
- kfree(entry);
- }
-
- return -ENOMEM;
-}
-
-static ssize_t filter_read(struct file *file, char __user *user_buf,
- size_t count, loff_t *ppos)
-{
- char buf[NAME_MAX_LEN + 1];
- unsigned long flags;
- 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\n", 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)
-{
- char buf[NAME_MAX_LEN];
- unsigned long flags;
- size_t len;
- 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
- */
- len = min(count, (size_t)(NAME_MAX_LEN - 1));
- if (copy_from_user(buf, userbuf, len))
- return -EFAULT;
-
- buf[len] = 0;
-
- write_lock_irqsave(&driver_name_lock, flags);
-
- /*
- * Now handle the string we got from userspace very carefully.
- * The rules are:
- * - only use the first token we got
- * - token delimiter is everything looking like a space
- * character (' ', '\n', '\t' ...)
- *
- */
- if (!isalnum(buf[0])) {
- /*
- * If the first character userspace gave us is not
- * alphanumerical then assume the filter should be
- * switched off.
- */
- if (current_driver_name[0])
- pr_info("DMA-API: switching off dma-debug driver filter\n");
- 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.
- */
- for (i = 0; i < NAME_MAX_LEN - 1; ++i) {
- current_driver_name[i] = buf[i];
- if (isspace(buf[i]) || buf[i] == ' ' || buf[i] == 0)
- break;
- }
- current_driver_name[i] = 0;
- current_driver = NULL;
-
- pr_info("DMA-API: enable driver filter for driver [%s]\n",
- current_driver_name);
-
-out_unlock:
- write_unlock_irqrestore(&driver_name_lock, flags);
-
- return count;
-}
-
-static const struct file_operations filter_fops = {
- .read = filter_read,
- .write = filter_write,
- .llseek = default_llseek,
-};
-
-static int dma_debug_fs_init(void)
-{
- dma_debug_dent = debugfs_create_dir("dma-api", NULL);
- if (!dma_debug_dent) {
- pr_err("DMA-API: can not create debugfs directory\n");
- return -ENOMEM;
- }
-
- global_disable_dent = debugfs_create_bool("disabled", 0444,
- dma_debug_dent,
- &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;
-
- filter_dent = debugfs_create_file("driver_filter", 0644,
- dma_debug_dent, NULL, &filter_fops);
- if (!filter_dent)
- goto out_err;
-
- return 0;
-
-out_err:
- debugfs_remove_recursive(dma_debug_dent);
-
- return -ENOMEM;
-}
-
-static int device_dma_allocations(struct device *dev, struct dma_debug_entry **out_entry)
-{
- struct dma_debug_entry *entry;
- unsigned long flags;
- int count = 0, i;
-
- for (i = 0; i < HASH_SIZE; ++i) {
- spin_lock_irqsave(&dma_entry_hash[i].lock, flags);
- list_for_each_entry(entry, &dma_entry_hash[i].list, list) {
- if (entry->dev == dev) {
- count += 1;
- *out_entry = entry;
- }
- }
- spin_unlock_irqrestore(&dma_entry_hash[i].lock, flags);
- }
-
- return count;
-}
-
-static int dma_debug_device_change(struct notifier_block *nb, unsigned long action, void *data)
-{
- struct device *dev = data;
- struct dma_debug_entry *uninitialized_var(entry);
- int count;
-
- if (dma_debug_disabled())
- return 0;
-
- switch (action) {
- case BUS_NOTIFY_UNBOUND_DRIVER:
- count = device_dma_allocations(dev, &entry);
- if (count == 0)
- break;
- err_printk(dev, entry, "DMA-API: device driver has pending "
- "DMA allocations while released from device "
- "[count=%d]\n"
- "One of leaked entries details: "
- "[device address=0x%016llx] [size=%llu bytes] "
- "[mapped with %s] [mapped as %s]\n",
- count, entry->dev_addr, entry->size,
- dir2name[entry->direction], type2name[entry->type]);
- break;
- default:
- break;
- }
-
- return 0;
-}
-
-void dma_debug_add_bus(struct bus_type *bus)
-{
- struct notifier_block *nb;
-
- if (dma_debug_disabled())
- return;
-
- nb = kzalloc(sizeof(struct notifier_block), GFP_KERNEL);
- if (nb == NULL) {
- pr_err("dma_debug_add_bus: out of memory\n");
- return;
- }
-
- nb->notifier_call = dma_debug_device_change;
-
- bus_register_notifier(bus, nb);
-}
-
-static int dma_debug_init(void)
-{
- int i;
-
- /* Do not use dma_debug_initialized here, since we really want to be
- * called to set dma_debug_initialized
- */
- if (global_disable)
- return 0;
-
- for (i = 0; i < HASH_SIZE; ++i) {
- INIT_LIST_HEAD(&dma_entry_hash[i].list);
- spin_lock_init(&dma_entry_hash[i].lock);
- }
-
- if (dma_debug_fs_init() != 0) {
- pr_err("DMA-API: error creating debugfs entries - disabling\n");
- global_disable = true;
-
- return 0;
- }
-
- if (prealloc_memory(nr_prealloc_entries) != 0) {
- pr_err("DMA-API: debugging out of memory error - disabled\n");
- global_disable = true;
-
- return 0;
- }
-
- nr_total_entries = num_free_entries;
-
- dma_debug_initialized = true;
-
- pr_info("DMA-API: debugging enabled by kernel config\n");
- return 0;
-}
-core_initcall(dma_debug_init);
-
-static __init int dma_debug_cmdline(char *str)
-{
- if (!str)
- return -EINVAL;
-
- if (strncmp(str, "off", 3) == 0) {
- pr_info("DMA-API: debugging disabled on kernel command line\n");
- global_disable = true;
- }
-
- return 0;
-}
-
-static __init int dma_debug_entries_cmdline(char *str)
-{
- if (!str)
- return -EINVAL;
- if (!get_option(&str, &nr_prealloc_entries))
- nr_prealloc_entries = PREALLOC_DMA_DEBUG_ENTRIES;
- return 0;
-}
-
-__setup("dma_debug=", dma_debug_cmdline);
-__setup("dma_debug_entries=", dma_debug_entries_cmdline);
-
-static void check_unmap(struct dma_debug_entry *ref)
-{
- struct dma_debug_entry *entry;
- struct hash_bucket *bucket;
- unsigned long flags;
-
- bucket = get_hash_bucket(ref, &flags);
- entry = bucket_find_exact(bucket, ref);
-
- if (!entry) {
- /* must drop lock before calling dma_mapping_error */
- put_hash_bucket(bucket, &flags);
-
- 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\n");
- } 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]\n",
- ref->dev_addr, ref->size);
- }
- return;
- }
-
- if (ref->size != entry->size) {
- err_printk(ref->dev, entry, "DMA-API: device driver frees "
- "DMA memory with different size "
- "[device address=0x%016llx] [map size=%llu bytes] "
- "[unmap size=%llu bytes]\n",
- ref->dev_addr, entry->size, ref->size);
- }
-
- if (ref->type != entry->type) {
- err_printk(ref->dev, entry, "DMA-API: device driver frees "
- "DMA memory with wrong function "
- "[device address=0x%016llx] [size=%llu bytes] "
- "[mapped as %s] [unmapped as %s]\n",
- ref->dev_addr, ref->size,
- type2name[entry->type], type2name[ref->type]);
- } else if ((entry->type == dma_debug_coherent) &&
- (phys_addr(ref) != phys_addr(entry))) {
- err_printk(ref->dev, entry, "DMA-API: device driver frees "
- "DMA memory with different CPU address "
- "[device address=0x%016llx] [size=%llu bytes] "
- "[cpu alloc address=0x%016llx] "
- "[cpu free address=0x%016llx]",
- ref->dev_addr, ref->size,
- phys_addr(entry),
- phys_addr(ref));
- }
-
- 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 frees "
- "DMA sg list with different entry count "
- "[map count=%d] [unmap count=%d]\n",
- 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) {
- err_printk(ref->dev, entry, "DMA-API: device driver frees "
- "DMA memory with different direction "
- "[device address=0x%016llx] [size=%llu bytes] "
- "[mapped with %s] [unmapped with %s]\n",
- ref->dev_addr, ref->size,
- dir2name[entry->direction],
- dir2name[ref->direction]);
- }
-
- /*
- * 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.
- */
- 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]);
- }
-
- hash_bucket_del(entry);
- dma_entry_free(entry);
-
- put_hash_bucket(bucket, &flags);
-}
-
-static void check_for_stack(struct device *dev,
- struct page *page, size_t offset)
-{
- 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]\n", 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]\n", addr);
- break;
- }
- }
-}
-
-static inline bool overlap(void *addr, unsigned long len, void *start, void *end)
-{
- unsigned long a1 = (unsigned long)addr;
- unsigned long b1 = a1 + len;
- unsigned long a2 = (unsigned long)start;
- unsigned long b2 = (unsigned long)end;
-
- return !(b1 <= a2 || a1 >= b2);
-}
-
-static void check_for_illegal_area(struct device *dev, void *addr, unsigned long len)
-{
- if (overlap(addr, len, _stext, _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]\n", addr, len);
-}
-
-static void check_sync(struct device *dev,
- struct dma_debug_entry *ref,
- bool to_cpu)
-{
- struct dma_debug_entry *entry;
- struct hash_bucket *bucket;
- unsigned long flags;
-
- bucket = get_hash_bucket(ref, &flags);
-
- entry = bucket_find_contain(&bucket, ref, &flags);
-
- if (!entry) {
- err_printk(dev, NULL, "DMA-API: device driver tries "
- "to sync DMA memory it has not allocated "
- "[device address=0x%016llx] [size=%llu bytes]\n",
- (unsigned long long)ref->dev_addr, ref->size);
- goto out;
- }
-
- if (ref->size > entry->size) {
- err_printk(dev, entry, "DMA-API: device driver syncs"
- " DMA memory outside allocated range "
- "[device address=0x%016llx] "
- "[allocation size=%llu bytes] "
- "[sync offset+size=%llu]\n",
- entry->dev_addr, entry->size,
- ref->size);
- }
-
- if (entry->direction == DMA_BIDIRECTIONAL)
- goto out;
-
- if (ref->direction != entry->direction) {
- err_printk(dev, entry, "DMA-API: device driver syncs "
- "DMA memory with different direction "
- "[device address=0x%016llx] [size=%llu bytes] "
- "[mapped with %s] [synced with %s]\n",
- (unsigned long long)ref->dev_addr, entry->size,
- dir2name[entry->direction],
- dir2name[ref->direction]);
- }
-
- if (to_cpu && !(entry->direction == DMA_FROM_DEVICE) &&
- !(ref->direction == DMA_TO_DEVICE))
- err_printk(dev, entry, "DMA-API: device driver syncs "
- "device read-only DMA memory for cpu "
- "[device address=0x%016llx] [size=%llu bytes] "
- "[mapped with %s] [synced with %s]\n",
- (unsigned long long)ref->dev_addr, entry->size,
- dir2name[entry->direction],
- dir2name[ref->direction]);
-
- if (!to_cpu && !(entry->direction == DMA_TO_DEVICE) &&
- !(ref->direction == DMA_FROM_DEVICE))
- err_printk(dev, entry, "DMA-API: device driver syncs "
- "device write-only DMA memory to device "
- "[device address=0x%016llx] [size=%llu bytes] "
- "[mapped with %s] [synced with %s]\n",
- (unsigned long long)ref->dev_addr, entry->size,
- dir2name[entry->direction],
- dir2name[ref->direction]);
-
- 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]\n",
- entry->sg_call_ents, ref->sg_call_ents);
- }
-
-out:
- put_hash_bucket(bucket, &flags);
-}
-
-static void check_sg_segment(struct device *dev, struct scatterlist *sg)
-{
-#ifdef CONFIG_DMA_API_DEBUG_SG
- unsigned int max_seg = dma_get_max_seg_size(dev);
- u64 start, end, boundary = dma_get_seg_boundary(dev);
-
- /*
- * Either the driver forgot to set dma_parms appropriately, or
- * whoever generated the list forgot to check them.
- */
- if (sg->length > max_seg)
- err_printk(dev, NULL, "DMA-API: mapping sg segment longer than device claims to support [len=%u] [max=%u]\n",
- sg->length, max_seg);
- /*
- * In some cases this could potentially be the DMA API
- * implementation's fault, but it would usually imply that
- * the scatterlist was built inappropriately to begin with.
- */
- start = sg_dma_address(sg);
- end = start + sg_dma_len(sg) - 1;
- if ((start ^ end) & ~boundary)
- err_printk(dev, NULL, "DMA-API: mapping sg segment across boundary [start=0x%016llx] [end=0x%016llx] [boundary=0x%016llx]\n",
- start, end, boundary);
-#endif
-}
-
-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(dma_debug_disabled()))
- return;
-
- if (dma_mapping_error(dev, dma_addr))
- return;
-
- entry = dma_entry_alloc();
- if (!entry)
- return;
-
- entry->dev = dev;
- entry->type = dma_debug_page;
- entry->pfn = page_to_pfn(page);
- entry->offset = offset,
- entry->dev_addr = dma_addr;
- entry->size = size;
- entry->direction = direction;
- entry->map_err_type = MAP_ERR_NOT_CHECKED;
-
- if (map_single)
- entry->type = dma_debug_single;
-
- check_for_stack(dev, page, offset);
-
- if (!PageHighMem(page)) {
- void *addr = page_address(page) + offset;
-
- check_for_illegal_area(dev, addr, size);
- }
-
- add_dma_entry(entry);
-}
-EXPORT_SYMBOL(debug_dma_map_page);
-
-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;
-
- if (unlikely(dma_debug_disabled()))
- return;
-
- ref.dev = dev;
- ref.dev_addr = dma_addr;
- bucket = get_hash_bucket(&ref, &flags);
-
- 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;
- }
- }
-
- put_hash_bucket(bucket, &flags);
-}
-EXPORT_SYMBOL(debug_dma_mapping_error);
-
-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(dma_debug_disabled()))
- return;
-
- if (map_single)
- ref.type = dma_debug_single;
-
- check_unmap(&ref);
-}
-EXPORT_SYMBOL(debug_dma_unmap_page);
-
-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(dma_debug_disabled()))
- 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->pfn = page_to_pfn(sg_page(s));
- entry->offset = s->offset,
- entry->size = sg_dma_len(s);
- entry->dev_addr = sg_dma_address(s);
- entry->direction = direction;
- entry->sg_call_ents = nents;
- entry->sg_mapped_ents = mapped_ents;
-
- check_for_stack(dev, sg_page(s), s->offset);
-
- if (!PageHighMem(sg_page(s))) {
- check_for_illegal_area(dev, sg_virt(s), sg_dma_len(s));
- }
-
- check_sg_segment(dev, s);
-
- add_dma_entry(entry);
- }
-}
-EXPORT_SYMBOL(debug_dma_map_sg);
-
-static int get_nr_mapped_entries(struct device *dev,
- struct dma_debug_entry *ref)
-{
- struct dma_debug_entry *entry;
- struct hash_bucket *bucket;
- unsigned long flags;
- int mapped_ents;
-
- bucket = get_hash_bucket(ref, &flags);
- entry = bucket_find_exact(bucket, ref);
- mapped_ents = 0;
-
- if (entry)
- mapped_ents = entry->sg_mapped_ents;
- put_hash_bucket(bucket, &flags);
-
- return mapped_ents;
-}
-
-void debug_dma_unmap_sg(struct device *dev, struct scatterlist *sglist,
- int nelems, int dir)
-{
- struct scatterlist *s;
- int mapped_ents = 0, i;
-
- if (unlikely(dma_debug_disabled()))
- return;
-
- for_each_sg(sglist, s, nelems, i) {
-
- struct dma_debug_entry ref = {
- .type = dma_debug_sg,
- .dev = dev,
- .pfn = page_to_pfn(sg_page(s)),
- .offset = s->offset,
- .dev_addr = sg_dma_address(s),
- .size = sg_dma_len(s),
- .direction = dir,
- .sg_call_ents = nelems,
- };
-
- if (mapped_ents && i >= mapped_ents)
- break;
-
- if (!i)
- mapped_ents = get_nr_mapped_entries(dev, &ref);
-
- check_unmap(&ref);
- }
-}
-EXPORT_SYMBOL(debug_dma_unmap_sg);
-
-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(dma_debug_disabled()))
- return;
-
- if (unlikely(virt == NULL))
- return;
-
- /* handle vmalloc and linear addresses */
- if (!is_vmalloc_addr(virt) && !virt_addr_valid(virt))
- return;
-
- entry = dma_entry_alloc();
- if (!entry)
- return;
-
- entry->type = dma_debug_coherent;
- entry->dev = dev;
- entry->offset = offset_in_page(virt);
- entry->size = size;
- entry->dev_addr = dma_addr;
- entry->direction = DMA_BIDIRECTIONAL;
-
- if (is_vmalloc_addr(virt))
- entry->pfn = vmalloc_to_pfn(virt);
- else
- entry->pfn = page_to_pfn(virt_to_page(virt));
-
- 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,
- .offset = offset_in_page(virt),
- .dev_addr = addr,
- .size = size,
- .direction = DMA_BIDIRECTIONAL,
- };
-
- /* handle vmalloc and linear addresses */
- if (!is_vmalloc_addr(virt) && !virt_addr_valid(virt))
- return;
-
- if (is_vmalloc_addr(virt))
- ref.pfn = vmalloc_to_pfn(virt);
- else
- ref.pfn = page_to_pfn(virt_to_page(virt));
-
- if (unlikely(dma_debug_disabled()))
- return;
-
- check_unmap(&ref);
-}
-EXPORT_SYMBOL(debug_dma_free_coherent);
-
-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;
- entry->pfn = PHYS_PFN(addr);
- 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);
-
-void debug_dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
- size_t size, int direction)
-{
- struct dma_debug_entry ref;
-
- if (unlikely(dma_debug_disabled()))
- return;
-
- 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);
-}
-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)
-{
- struct dma_debug_entry ref;
-
- if (unlikely(dma_debug_disabled()))
- return;
-
- 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);
-}
-EXPORT_SYMBOL(debug_dma_sync_single_for_device);
-
-void debug_dma_sync_single_range_for_cpu(struct device *dev,
- dma_addr_t dma_handle,
- unsigned long offset, size_t size,
- int direction)
-{
- struct dma_debug_entry ref;
-
- if (unlikely(dma_debug_disabled()))
- return;
-
- 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);
-}
-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)
-{
- struct dma_debug_entry ref;
-
- if (unlikely(dma_debug_disabled()))
- return;
-
- 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);
-}
-EXPORT_SYMBOL(debug_dma_sync_single_range_for_device);
-
-void debug_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
- int nelems, int direction)
-{
- struct scatterlist *s;
- int mapped_ents = 0, i;
-
- if (unlikely(dma_debug_disabled()))
- return;
-
- for_each_sg(sg, s, nelems, i) {
-
- struct dma_debug_entry ref = {
- .type = dma_debug_sg,
- .dev = dev,
- .pfn = page_to_pfn(sg_page(s)),
- .offset = s->offset,
- .dev_addr = sg_dma_address(s),
- .size = sg_dma_len(s),
- .direction = direction,
- .sg_call_ents = nelems,
- };
-
- if (!i)
- mapped_ents = get_nr_mapped_entries(dev, &ref);
-
- if (i >= mapped_ents)
- break;
-
- check_sync(dev, &ref, true);
- }
-}
-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;
- int mapped_ents = 0, i;
-
- if (unlikely(dma_debug_disabled()))
- return;
-
- for_each_sg(sg, s, nelems, i) {
-
- struct dma_debug_entry ref = {
- .type = dma_debug_sg,
- .dev = dev,
- .pfn = page_to_pfn(sg_page(s)),
- .offset = s->offset,
- .dev_addr = sg_dma_address(s),
- .size = sg_dma_len(s),
- .direction = direction,
- .sg_call_ents = nelems,
- };
- if (!i)
- mapped_ents = get_nr_mapped_entries(dev, &ref);
-
- if (i >= mapped_ents)
- break;
-
- check_sync(dev, &ref, false);
- }
-}
-EXPORT_SYMBOL(debug_dma_sync_sg_for_device);
-
-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])
- pr_info("DMA-API: enable driver filter for driver [%s]\n",
- current_driver_name);
-
-
- return 1;
-}
-__setup("dma_debug_driver=", dma_debug_driver_setup);
projects / linux-2.6-block.git / blobdiff