diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Kconfig.debug | 11 | ||||
| -rw-r--r-- | lib/Makefile | 2 | ||||
| -rw-r--r-- | lib/dma-debug.c | 955 | ||||
| -rw-r--r-- | lib/swiotlb.c | 88 |
4 files changed, 1007 insertions, 49 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 0626fa4856e6..58bfe7e8faba 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -912,6 +912,17 @@ config DYNAMIC_DEBUG See Documentation/dynamic-debug-howto.txt for additional information. +config DMA_API_DEBUG + bool "Enable debugging of DMA-API usage" + depends on HAVE_DMA_API_DEBUG + help + Enable this option to debug the use of the DMA API by device drivers. + With this option you will be able to detect common bugs in device + drivers like double-freeing of DMA mappings or freeing mappings that + were never allocated. + This option causes a performance degredation. Use only if you want + to debug device drivers. If unsure, say N. + source "samples/Kconfig" source "lib/Kconfig.kgdb" diff --git a/lib/Makefile b/lib/Makefile index 051a33a8e028..d6edd6753f40 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -90,6 +90,8 @@ obj-$(CONFIG_DYNAMIC_DEBUG) += dynamic_debug.o obj-$(CONFIG_NLATTR) += nlattr.o +obj-$(CONFIG_DMA_API_DEBUG) += dma-debug.o + hostprogs-y := gen_crc32table clean-files := crc32table.h diff --git a/lib/dma-debug.c b/lib/dma-debug.c new file mode 100644 index 000000000000..1a992089486c --- /dev/null +++ b/lib/dma-debug.c @@ -0,0 +1,955 @@ +/* + * 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)) { + err_printk(ref->dev, NULL, "DMA-API: device driver tries " + "to free an invalid DMA memory address\n"); + 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) + entry->type = dma_debug_single; + + if (!PageHighMem(page)) { + void *addr = ((char *)page_address(page)) + offset; + 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; + + if (!PageHighMem(sg_page(s))) { + 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); + diff --git a/lib/swiotlb.c b/lib/swiotlb.c index 1f991acc2a05..32e2bd3b1142 100644 --- a/lib/swiotlb.c +++ b/lib/swiotlb.c @@ -145,7 +145,7 @@ static void *swiotlb_bus_to_virt(dma_addr_t address) return phys_to_virt(swiotlb_bus_to_phys(address)); } -int __weak swiotlb_arch_range_needs_mapping(void *ptr, size_t size) +int __weak swiotlb_arch_range_needs_mapping(phys_addr_t paddr, size_t size) { return 0; } @@ -315,9 +315,9 @@ address_needs_mapping(struct device *hwdev, dma_addr_t addr, size_t size) return !is_buffer_dma_capable(dma_get_mask(hwdev), addr, size); } -static inline int range_needs_mapping(void *ptr, size_t size) +static inline int range_needs_mapping(phys_addr_t paddr, size_t size) { - return swiotlb_force || swiotlb_arch_range_needs_mapping(ptr, size); + return swiotlb_force || swiotlb_arch_range_needs_mapping(paddr, size); } static int is_swiotlb_buffer(char *addr) @@ -636,11 +636,14 @@ swiotlb_full(struct device *dev, size_t size, int dir, int do_panic) * Once the device is given the dma address, the device owns this memory until * either swiotlb_unmap_single or swiotlb_dma_sync_single is performed. */ -dma_addr_t -swiotlb_map_single_attrs(struct device *hwdev, void *ptr, size_t size, - int dir, struct dma_attrs *attrs) -{ - dma_addr_t dev_addr = swiotlb_virt_to_bus(hwdev, ptr); +dma_addr_t swiotlb_map_page(struct device *dev, struct page *page, + unsigned long offset, size_t size, + enum dma_data_direction dir, + struct dma_attrs *attrs) +{ + phys_addr_t phys = page_to_phys(page) + offset; + void *ptr = page_address(page) + offset; + dma_addr_t dev_addr = swiotlb_phys_to_bus(dev, phys); void *map; BUG_ON(dir == DMA_NONE); @@ -649,37 +652,30 @@ swiotlb_map_single_attrs(struct device *hwdev, void *ptr, size_t size, * we can safely return the device addr and not worry about bounce * buffering it. */ - if (!address_needs_mapping(hwdev, dev_addr, size) && - !range_needs_mapping(ptr, size)) + if (!address_needs_mapping(dev, dev_addr, size) && + !range_needs_mapping(virt_to_phys(ptr), size)) return dev_addr; /* * Oh well, have to allocate and map a bounce buffer. */ - map = map_single(hwdev, virt_to_phys(ptr), size, dir); + map = map_single(dev, phys, size, dir); if (!map) { - swiotlb_full(hwdev, size, dir, 1); + swiotlb_full(dev, size, dir, 1); map = io_tlb_overflow_buffer; } - dev_addr = swiotlb_virt_to_bus(hwdev, map); + dev_addr = swiotlb_virt_to_bus(dev, map); /* * Ensure that the address returned is DMA'ble */ - if (address_needs_mapping(hwdev, dev_addr, size)) + if (address_needs_mapping(dev, dev_addr, size)) panic("map_single: bounce buffer is not DMA'ble"); return dev_addr; } -EXPORT_SYMBOL(swiotlb_map_single_attrs); - -dma_addr_t -swiotlb_map_single(struct device *hwdev, void *ptr, size_t size, int dir) -{ - return swiotlb_map_single_attrs(hwdev, ptr, size, dir, NULL); -} -EXPORT_SYMBOL(swiotlb_map_single); +EXPORT_SYMBOL_GPL(swiotlb_map_page); /* * Unmap a single streaming mode DMA translation. The dma_addr and size must @@ -689,9 +685,9 @@ EXPORT_SYMBOL(swiotlb_map_single); * After this call, reads by the cpu to the buffer are guaranteed to see * whatever the device wrote there. */ -void -swiotlb_unmap_single_attrs(struct device *hwdev, dma_addr_t dev_addr, - size_t size, int dir, struct dma_attrs *attrs) +void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr, + size_t size, enum dma_data_direction dir, + struct dma_attrs *attrs) { char *dma_addr = swiotlb_bus_to_virt(dev_addr); @@ -701,15 +697,7 @@ swiotlb_unmap_single_attrs(struct device *hwdev, dma_addr_t dev_addr, else if (dir == DMA_FROM_DEVICE) dma_mark_clean(dma_addr, size); } -EXPORT_SYMBOL(swiotlb_unmap_single_attrs); - -void -swiotlb_unmap_single(struct device *hwdev, dma_addr_t dev_addr, size_t size, - int dir) -{ - return swiotlb_unmap_single_attrs(hwdev, dev_addr, size, dir, NULL); -} -EXPORT_SYMBOL(swiotlb_unmap_single); +EXPORT_SYMBOL_GPL(swiotlb_unmap_page); /* * Make physical memory consistent for a single streaming mode DMA translation @@ -736,7 +724,7 @@ swiotlb_sync_single(struct device *hwdev, dma_addr_t dev_addr, void swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr, - size_t size, int dir) + size_t size, enum dma_data_direction dir) { swiotlb_sync_single(hwdev, dev_addr, size, dir, SYNC_FOR_CPU); } @@ -744,7 +732,7 @@ EXPORT_SYMBOL(swiotlb_sync_single_for_cpu); void swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr, - size_t size, int dir) + size_t size, enum dma_data_direction dir) { swiotlb_sync_single(hwdev, dev_addr, size, dir, SYNC_FOR_DEVICE); } @@ -769,7 +757,8 @@ swiotlb_sync_single_range(struct device *hwdev, dma_addr_t dev_addr, void swiotlb_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dev_addr, - unsigned long offset, size_t size, int dir) + unsigned long offset, size_t size, + enum dma_data_direction dir) { swiotlb_sync_single_range(hwdev, dev_addr, offset, size, dir, SYNC_FOR_CPU); @@ -778,7 +767,8 @@ EXPORT_SYMBOL_GPL(swiotlb_sync_single_range_for_cpu); void swiotlb_sync_single_range_for_device(struct device *hwdev, dma_addr_t dev_addr, - unsigned long offset, size_t size, int dir) + unsigned long offset, size_t size, + enum dma_data_direction dir) { swiotlb_sync_single_range(hwdev, dev_addr, offset, size, dir, SYNC_FOR_DEVICE); @@ -803,7 +793,7 @@ EXPORT_SYMBOL_GPL(swiotlb_sync_single_range_for_device); */ int swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems, - int dir, struct dma_attrs *attrs) + enum dma_data_direction dir, struct dma_attrs *attrs) { struct scatterlist *sg; int i; @@ -811,10 +801,10 @@ swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems, BUG_ON(dir == DMA_NONE); for_each_sg(sgl, sg, nelems, i) { - void *addr = sg_virt(sg); - dma_addr_t dev_addr = swiotlb_virt_to_bus(hwdev, addr); + phys_addr_t paddr = sg_phys(sg); + dma_addr_t dev_addr = swiotlb_phys_to_bus(hwdev, paddr); - if (range_needs_mapping(addr, sg->length) || + if (range_needs_mapping(paddr, sg->length) || address_needs_mapping(hwdev, dev_addr, sg->length)) { void *map = map_single(hwdev, sg_phys(sg), sg->length, dir); @@ -850,7 +840,7 @@ EXPORT_SYMBOL(swiotlb_map_sg); */ void swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl, - int nelems, int dir, struct dma_attrs *attrs) + int nelems, enum dma_data_direction dir, struct dma_attrs *attrs) { struct scatterlist *sg; int i; @@ -858,11 +848,11 @@ swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl, BUG_ON(dir == DMA_NONE); for_each_sg(sgl, sg, nelems, i) { - if (sg->dma_address != swiotlb_virt_to_bus(hwdev, sg_virt(sg))) + if (sg->dma_address != swiotlb_phys_to_bus(hwdev, sg_phys(sg))) unmap_single(hwdev, swiotlb_bus_to_virt(sg->dma_address), sg->dma_length, dir); else if (dir == DMA_FROM_DEVICE) - dma_mark_clean(sg_virt(sg), sg->dma_length); + dma_mark_clean(swiotlb_bus_to_virt(sg->dma_address), sg->dma_length); } } EXPORT_SYMBOL(swiotlb_unmap_sg_attrs); @@ -892,17 +882,17 @@ swiotlb_sync_sg(struct device *hwdev, struct scatterlist *sgl, BUG_ON(dir == DMA_NONE); for_each_sg(sgl, sg, nelems, i) { - if (sg->dma_address != swiotlb_virt_to_bus(hwdev, sg_virt(sg))) + if (sg->dma_address != swiotlb_phys_to_bus(hwdev, sg_phys(sg))) sync_single(hwdev, swiotlb_bus_to_virt(sg->dma_address), sg->dma_length, dir, target); else if (dir == DMA_FROM_DEVICE) - dma_mark_clean(sg_virt(sg), sg->dma_length); + dma_mark_clean(swiotlb_bus_to_virt(sg->dma_address), sg->dma_length); } } void swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg, - int nelems, int dir) + int nelems, enum dma_data_direction dir) { swiotlb_sync_sg(hwdev, sg, nelems, dir, SYNC_FOR_CPU); } @@ -910,7 +900,7 @@ EXPORT_SYMBOL(swiotlb_sync_sg_for_cpu); void swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg, - int nelems, int dir) + int nelems, enum dma_data_direction dir) { swiotlb_sync_sg(hwdev, sg, nelems, dir, SYNC_FOR_DEVICE); } |