| /* |
| * 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/scatterlist.h> |
| #include <linux/dma-mapping.h> |
| #include <linux/stacktrace.h> |
| #include <linux/dma-debug.h> |
| #include <linux/spinlock.h> |
| #include <linux/debugfs.h> |
| #include <linux/device.h> |
| #include <linux/types.h> |
| #include <linux/sched.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) |
| |
| enum { |
| dma_debug_single, |
| dma_debug_page, |
| dma_debug_sg, |
| dma_debug_coherent, |
| }; |
| |
| #define DMA_DEBUG_STACKTRACE_ENTRIES 5 |
| |
| struct dma_debug_entry { |
| struct list_head list; |
| struct device *dev; |
| int type; |
| phys_addr_t paddr; |
| u64 dev_addr; |
| u64 size; |
| int direction; |
| int sg_call_ents; |
| int sg_mapped_ents; |
| #ifdef CONFIG_STACKTRACE |
| struct stack_trace stacktrace; |
| unsigned long st_entries[DMA_DEBUG_STACKTRACE_ENTRIES]; |
| #endif |
| }; |
| |
| 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; |
| |
| /* 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; |
| |
| /* number of preallocated entries requested by kernel cmdline */ |
| static u32 req_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 const char *type2name[4] = { "single", "page", |
| "scather-gather", "coherent" }; |
| |
| 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) { |
| printk(KERN_WARNING "Mapped at:\n"); |
| print_stack_trace(&entry->stacktrace, 0); |
| } |
| #endif |
| } |
| |
| #define err_printk(dev, entry, format, arg...) do { \ |
| error_count += 1; \ |
| if (show_all_errors || show_num_errors > 0) { \ |
| WARN(1, "%s %s: " format, \ |
| dev_driver_string(dev), \ |
| dev_name(dev) , ## 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) |
| { |
| int idx = hash_fn(entry); |
| unsigned long __flags; |
| |
| spin_lock_irqsave(&dma_entry_hash[idx].lock, __flags); |
| *flags = __flags; |
| return &dma_entry_hash[idx]; |
| } |
| |
| /* |
| * Give up exclusive access to the hash bucket |
| */ |
| static void put_hash_bucket(struct hash_bucket *bucket, |
| unsigned long *flags) |
| { |
| unsigned long __flags = *flags; |
| |
| spin_unlock_irqrestore(&bucket->lock, __flags); |
| } |
| |
| /* |
| * Search a given entry in the hash bucket list |
| */ |
| static struct dma_debug_entry *hash_bucket_find(struct hash_bucket *bucket, |
| struct dma_debug_entry *ref) |
| { |
| struct dma_debug_entry *entry; |
| |
| list_for_each_entry(entry, &bucket->list, list) { |
| if ((entry->dev_addr == ref->dev_addr) && |
| (entry->dev == ref->dev)) |
| return entry; |
| } |
| |
| 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); |
| } |
| |
| /* |
| * Dump mapping entries for debugging purposes |
| */ |
| void debug_dma_dump_mappings(struct device *dev) |
| { |
| int idx; |
| |
| for (idx = 0; idx < HASH_SIZE; idx++) { |
| struct hash_bucket *bucket = &dma_entry_hash[idx]; |
| struct dma_debug_entry *entry; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&bucket->lock, flags); |
| |
| list_for_each_entry(entry, &bucket->list, list) { |
| if (!dev || dev == entry->dev) { |
| dev_info(entry->dev, |
| "%s idx %d P=%Lx D=%Lx L=%Lx %s\n", |
| type2name[entry->type], idx, |
| (unsigned long long)entry->paddr, |
| entry->dev_addr, entry->size, |
| dir2name[entry->direction]); |
| } |
| } |
| |
| spin_unlock_irqrestore(&bucket->lock, flags); |
| } |
| } |
| EXPORT_SYMBOL(debug_dma_dump_mappings); |
| |
| /* |
| * Wrapper function for adding an entry to the hash. |
| * This function takes care of locking itself. |
| */ |
| static void add_dma_entry(struct dma_debug_entry *entry) |
| { |
| struct hash_bucket *bucket; |
| unsigned long flags; |
| |
| bucket = get_hash_bucket(entry, &flags); |
| hash_bucket_add(bucket, entry); |
| put_hash_bucket(bucket, &flags); |
| } |
| |
| /* struct dma_entry allocator |
| * |
| * The next two functions implement the allocator for |
| * struct dma_debug_entries. |
| */ |
| static struct dma_debug_entry *dma_entry_alloc(void) |
| { |
| struct dma_debug_entry *entry = NULL; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&free_entries_lock, flags); |
| |
| if (list_empty(&free_entries)) { |
| printk(KERN_ERR "DMA-API: debugging out of memory " |
| "- disabling\n"); |
| global_disable = true; |
| goto out; |
| } |
| |
| entry = list_entry(free_entries.next, struct dma_debug_entry, list); |
| list_del(&entry->list); |
| memset(entry, 0, sizeof(*entry)); |
| |
| #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 |
| num_free_entries -= 1; |
| if (num_free_entries < min_free_entries) |
| min_free_entries = num_free_entries; |
| |
| out: |
| spin_unlock_irqrestore(&free_entries_lock, flags); |
| |
| return entry; |
| } |
| |
| static void dma_entry_free(struct dma_debug_entry *entry) |
| { |
| unsigned long flags; |
| |
| /* |
| * add to beginning of the list - this way the entries are |
| * more likely cache hot when they are reallocated. |
| */ |
| spin_lock_irqsave(&free_entries_lock, flags); |
| list_add(&entry->list, &free_entries); |
| num_free_entries += 1; |
| spin_unlock_irqrestore(&free_entries_lock, flags); |
| } |
| |
| /* |
| * 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; |
| |
| printk(KERN_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 int dma_debug_fs_init(void) |
| { |
| dma_debug_dent = debugfs_create_dir("dma-api", NULL); |
| if (!dma_debug_dent) { |
| printk(KERN_ERR "DMA-API: can not create debugfs directory\n"); |
| return -ENOMEM; |
| } |
| |
| global_disable_dent = debugfs_create_bool("disabled", 0444, |
| dma_debug_dent, |
| (u32 *)&global_disable); |
| if (!global_disable_dent) |
| goto out_err; |
| |
| error_count_dent = debugfs_create_u32("error_count", 0444, |
| dma_debug_dent, &error_count); |
| if (!error_count_dent) |
| goto out_err; |
| |
| show_all_errors_dent = debugfs_create_u32("all_errors", 0644, |
| dma_debug_dent, |
| &show_all_errors); |
| if (!show_all_errors_dent) |
| goto out_err; |
| |
| show_num_errors_dent = debugfs_create_u32("num_errors", 0644, |
| dma_debug_dent, |
| &show_num_errors); |
| if (!show_num_errors_dent) |
| goto out_err; |
| |
| num_free_entries_dent = debugfs_create_u32("num_free_entries", 0444, |
| dma_debug_dent, |
| &num_free_entries); |
| if (!num_free_entries_dent) |
| goto out_err; |
| |
| min_free_entries_dent = debugfs_create_u32("min_free_entries", 0444, |
| dma_debug_dent, |
| &min_free_entries); |
| if (!min_free_entries_dent) |
| goto out_err; |
| |
| return 0; |
| |
| out_err: |
| debugfs_remove_recursive(dma_debug_dent); |
| |
| return -ENOMEM; |
| } |
| |
| static int device_dma_allocations(struct device *dev) |
| { |
| 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; |
| } |
| 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; |
| int count; |
| |
| |
| switch (action) { |
| case BUS_NOTIFY_UNBIND_DRIVER: |
| count = device_dma_allocations(dev); |
| if (count == 0) |
| break; |
| err_printk(dev, NULL, "DMA-API: device driver has pending " |
| "DMA allocations while released from device " |
| "[count=%d]\n", count); |
| break; |
| default: |
| break; |
| } |
| |
| return 0; |
| } |
| |
| void dma_debug_add_bus(struct bus_type *bus) |
| { |
| struct notifier_block *nb; |
| |
| nb = kzalloc(sizeof(struct notifier_block), GFP_KERNEL); |
| if (nb == NULL) { |
| printk(KERN_ERR "dma_debug_add_bus: out of memory\n"); |
| return; |
| } |
| |
| nb->notifier_call = dma_debug_device_change; |
| |
| bus_register_notifier(bus, nb); |
| } |
| |
| /* |
| * Let the architectures decide how many entries should be preallocated. |
| */ |
| void dma_debug_init(u32 num_entries) |
| { |
| int i; |
| |
| if (global_disable) |
| return; |
| |
| for (i = 0; i < HASH_SIZE; ++i) { |
| INIT_LIST_HEAD(&dma_entry_hash[i].list); |
| dma_entry_hash[i].lock = SPIN_LOCK_UNLOCKED; |
| } |
| |
| if (dma_debug_fs_init() != 0) { |
| printk(KERN_ERR "DMA-API: error creating debugfs entries " |
| "- disabling\n"); |
| global_disable = true; |
| |
| return; |
| } |
| |
| if (req_entries) |
| num_entries = req_entries; |
| |
| if (prealloc_memory(num_entries) != 0) { |
| printk(KERN_ERR "DMA-API: debugging out of memory error " |
| "- disabled\n"); |
| global_disable = true; |
| |
| return; |
| } |
| |
| printk(KERN_INFO "DMA-API: debugging enabled by kernel config\n"); |
| } |
| |
| static __init int dma_debug_cmdline(char *str) |
| { |
| if (!str) |
| return -EINVAL; |
| |
| if (strncmp(str, "off", 3) == 0) { |
| printk(KERN_INFO "DMA-API: debugging disabled on kernel " |
| "command line\n"); |
| 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); |
| |
| static void check_unmap(struct dma_debug_entry *ref) |
| { |
| struct dma_debug_entry *entry; |
| struct hash_bucket *bucket; |
| unsigned long flags; |
| |
| if (dma_mapping_error(ref->dev, ref->dev_addr)) |
| return; |
| |
| bucket = get_hash_bucket(ref, &flags); |
| entry = hash_bucket_find(bucket, ref); |
| |
| if (!entry) { |
| 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); |
| goto out; |
| } |
| |
| 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) && |
| (ref->paddr != entry->paddr)) { |
| 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=%p] [cpu free address=%p]", |
| ref->dev_addr, ref->size, |
| (void *)entry->paddr, (void *)ref->paddr); |
| } |
| |
| 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]); |
| } |
| |
| hash_bucket_del(entry); |
| dma_entry_free(entry); |
| |
| out: |
| put_hash_bucket(bucket, &flags); |
| } |
| |
| static void check_for_stack(struct device *dev, void *addr) |
| { |
| if (object_is_on_stack(addr)) |
| err_printk(dev, NULL, "DMA-API: device driver maps memory from" |
| "stack [addr=%p]\n", addr); |
| } |
| |
| static inline bool overlap(void *addr, u64 size, void *start, void *end) |
| { |
| void *addr2 = (char *)addr + size; |
| |
| return ((addr >= start && addr < end) || |
| (addr2 >= start && addr2 < end) || |
| ((addr < start) && (addr2 >= end))); |
| } |
| |
| static void check_for_illegal_area(struct device *dev, void *addr, u64 size) |
| { |
| if (overlap(addr, size, _text, _etext) || |
| overlap(addr, size, __start_rodata, __end_rodata)) |
| err_printk(dev, NULL, "DMA-API: device driver maps " |
| "memory from kernel text or rodata " |
| "[addr=%p] [size=%llu]\n", addr, size); |
| } |
| |
| static void check_sync(struct device *dev, dma_addr_t addr, |
| u64 size, u64 offset, int direction, bool to_cpu) |
| { |
| struct dma_debug_entry ref = { |
| .dev = dev, |
| .dev_addr = addr, |
| .size = size, |
| .direction = direction, |
| }; |
| struct dma_debug_entry *entry; |
| struct hash_bucket *bucket; |
| unsigned long flags; |
| |
| bucket = get_hash_bucket(&ref, &flags); |
| |
| entry = hash_bucket_find(bucket, &ref); |
| |
| 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", |
| addr, size); |
| goto out; |
| } |
| |
| if ((offset + 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=%llu] " |
| "[sync size=%llu]\n", entry->dev_addr, entry->size, |
| offset, size); |
| } |
| |
| if (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", |
| addr, entry->size, |
| dir2name[entry->direction], |
| dir2name[direction]); |
| } |
| |
| if (entry->direction == DMA_BIDIRECTIONAL) |
| goto out; |
| |
| if (to_cpu && !(entry->direction == DMA_FROM_DEVICE) && |
| !(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", |
| addr, entry->size, |
| dir2name[entry->direction], |
| dir2name[direction]); |
| |
| if (!to_cpu && !(entry->direction == DMA_TO_DEVICE) && |
| !(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", |
| addr, entry->size, |
| dir2name[entry->direction], |
| dir2name[direction]); |
| |
| out: |
| put_hash_bucket(bucket, &flags); |
| |
| } |
| |
| void debug_dma_map_page(struct device *dev, struct page *page, size_t offset, |
| size_t size, int direction, dma_addr_t dma_addr, |
| bool map_single) |
| { |
| struct dma_debug_entry *entry; |
| |
| if (unlikely(global_disable)) |
| return; |
| |
| if (unlikely(dma_mapping_error(dev, dma_addr))) |
| return; |
| |
| entry = dma_entry_alloc(); |
| if (!entry) |
| return; |
| |
| entry->dev = dev; |
| entry->type = dma_debug_page; |
| entry->paddr = page_to_phys(page) + offset; |
| entry->dev_addr = dma_addr; |
| entry->size = size; |
| entry->direction = direction; |
| |
| if (map_single) { |
| void *addr = ((char *)page_address(page)) + offset; |
| |
| entry->type = dma_debug_single; |
| check_for_stack(dev, addr); |
| check_for_illegal_area(dev, addr, size); |
| } |
| |
| add_dma_entry(entry); |
| } |
| EXPORT_SYMBOL(debug_dma_map_page); |
| |
| void debug_dma_unmap_page(struct device *dev, dma_addr_t addr, |
| size_t size, int direction, bool map_single) |
| { |
| struct dma_debug_entry ref = { |
| .type = dma_debug_page, |
| .dev = dev, |
| .dev_addr = addr, |
| .size = size, |
| .direction = direction, |
| }; |
| |
| if (unlikely(global_disable)) |
| return; |
| |
| if (map_single) |
| ref.type = dma_debug_single; |
| |
| check_unmap(&ref); |
| } |
| EXPORT_SYMBOL(debug_dma_unmap_page); |
| |
| void debug_dma_map_sg(struct device *dev, struct scatterlist *sg, |
| int nents, int mapped_ents, int direction) |
| { |
| struct dma_debug_entry *entry; |
| struct scatterlist *s; |
| int i; |
| |
| if (unlikely(global_disable)) |
| return; |
| |
| for_each_sg(sg, s, mapped_ents, i) { |
| entry = dma_entry_alloc(); |
| if (!entry) |
| return; |
| |
| entry->type = dma_debug_sg; |
| entry->dev = dev; |
| entry->paddr = sg_phys(s); |
| entry->size = s->length; |
| entry->dev_addr = s->dma_address; |
| entry->direction = direction; |
| entry->sg_call_ents = nents; |
| entry->sg_mapped_ents = mapped_ents; |
| |
| check_for_stack(dev, sg_virt(s)); |
| check_for_illegal_area(dev, sg_virt(s), s->length); |
| |
| add_dma_entry(entry); |
| } |
| } |
| EXPORT_SYMBOL(debug_dma_map_sg); |
| |
| void debug_dma_unmap_sg(struct device *dev, struct scatterlist *sglist, |
| int nelems, int dir) |
| { |
| struct dma_debug_entry *entry; |
| struct scatterlist *s; |
| int mapped_ents = 0, i; |
| unsigned long flags; |
| |
| if (unlikely(global_disable)) |
| return; |
| |
| for_each_sg(sglist, s, nelems, i) { |
| |
| struct dma_debug_entry ref = { |
| .type = dma_debug_sg, |
| .dev = dev, |
| .paddr = sg_phys(s), |
| .dev_addr = s->dma_address, |
| .size = s->length, |
| .direction = dir, |
| .sg_call_ents = 0, |
| }; |
| |
| if (mapped_ents && i >= mapped_ents) |
| break; |
| |
| if (mapped_ents == 0) { |
| struct hash_bucket *bucket; |
| ref.sg_call_ents = nelems; |
| bucket = get_hash_bucket(&ref, &flags); |
| entry = hash_bucket_find(bucket, &ref); |
| if (entry) |
| mapped_ents = entry->sg_mapped_ents; |
| put_hash_bucket(bucket, &flags); |
| } |
| |
| 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(global_disable)) |
| return; |
| |
| if (unlikely(virt == NULL)) |
| return; |
| |
| entry = dma_entry_alloc(); |
| if (!entry) |
| return; |
| |
| entry->type = dma_debug_coherent; |
| entry->dev = dev; |
| entry->paddr = virt_to_phys(virt); |
| entry->size = size; |
| entry->dev_addr = dma_addr; |
| entry->direction = DMA_BIDIRECTIONAL; |
| |
| add_dma_entry(entry); |
| } |
| EXPORT_SYMBOL(debug_dma_alloc_coherent); |
| |
| void debug_dma_free_coherent(struct device *dev, size_t size, |
| void *virt, dma_addr_t addr) |
| { |
| struct dma_debug_entry ref = { |
| .type = dma_debug_coherent, |
| .dev = dev, |
| .paddr = virt_to_phys(virt), |
| .dev_addr = addr, |
| .size = size, |
| .direction = DMA_BIDIRECTIONAL, |
| }; |
| |
| if (unlikely(global_disable)) |
| return; |
| |
| check_unmap(&ref); |
| } |
| EXPORT_SYMBOL(debug_dma_free_coherent); |
| |
| void debug_dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, |
| size_t size, int direction) |
| { |
| if (unlikely(global_disable)) |
| return; |
| |
| check_sync(dev, dma_handle, size, 0, direction, 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) |
| { |
| if (unlikely(global_disable)) |
| return; |
| |
| check_sync(dev, dma_handle, size, 0, direction, 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) |
| { |
| if (unlikely(global_disable)) |
| return; |
| |
| check_sync(dev, dma_handle, size, offset, direction, 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) |
| { |
| if (unlikely(global_disable)) |
| return; |
| |
| check_sync(dev, dma_handle, size, offset, direction, 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 i; |
| |
| if (unlikely(global_disable)) |
| return; |
| |
| for_each_sg(sg, s, nelems, i) { |
| check_sync(dev, s->dma_address, s->dma_length, 0, |
| direction, 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 i; |
| |
| if (unlikely(global_disable)) |
| return; |
| |
| for_each_sg(sg, s, nelems, i) { |
| check_sync(dev, s->dma_address, s->dma_length, 0, |
| direction, false); |
| } |
| } |
| EXPORT_SYMBOL(debug_dma_sync_sg_for_device); |
| |