mirror of
https://github.com/Fishwaldo/Star64_linux.git
synced 2025-06-23 07:01:23 +00:00
Merge branch 'dma-debug/2.6.31' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/linux-2.6-iommu into core/iommu
This commit is contained in:
Ingo Molnar
commit
62a6f465f6
3 changed files with 288 additions and 22 deletions
291
lib/dma-debug.c
291
lib/dma-debug.c
|
|
@ -23,9 +23,11 @@
|
|||
#include <linux/dma-debug.h>
|
||||
#include <linux/spinlock.h>
|
||||
#include <linux/debugfs.h>
|
||||
#include <linux/uaccess.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>
|
||||
|
||||
|
|
@ -98,6 +100,16 @@ 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 *type2name[4] = { "single", "page",
|
||||
"scather-gather", "coherent" };
|
||||
|
|
@ -105,6 +117,11 @@ static const char *type2name[4] = { "single", "page",
|
|||
static const char *dir2name[4] = { "DMA_BIDIRECTIONAL", "DMA_TO_DEVICE",
|
||||
"DMA_FROM_DEVICE", "DMA_NONE" };
|
||||
|
||||
/* little merge helper - remove it after the merge window */
|
||||
#ifndef BUS_NOTIFY_UNBOUND_DRIVER
|
||||
#define BUS_NOTIFY_UNBOUND_DRIVER 0x0005
|
||||
#endif
|
||||
|
||||
/*
|
||||
* 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
|
||||
|
|
@ -128,9 +145,48 @@ static inline void dump_entry_trace(struct dma_debug_entry *entry)
|
|||
#endif
|
||||
}
|
||||
|
||||
static bool driver_filter(struct device *dev)
|
||||
{
|
||||
/* driver filter off */
|
||||
if (likely(!current_driver_name[0]))
|
||||
return true;
|
||||
|
||||
/* driver filter on and initialized */
|
||||
if (current_driver && dev->driver == current_driver)
|
||||
return true;
|
||||
|
||||
/* driver filter on but not yet initialized */
|
||||
if (!current_driver && current_driver_name[0]) {
|
||||
struct device_driver *drv = get_driver(dev->driver);
|
||||
unsigned long flags;
|
||||
bool ret = false;
|
||||
|
||||
if (!drv)
|
||||
return false;
|
||||
|
||||
/* lock to protect against change of current_driver_name */
|
||||
read_lock_irqsave(&driver_name_lock, flags);
|
||||
|
||||
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);
|
||||
put_driver(drv);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
#define err_printk(dev, entry, format, arg...) do { \
|
||||
error_count += 1; \
|
||||
if (show_all_errors || show_num_errors > 0) { \
|
||||
if (driver_filter(dev) && \
|
||||
(show_all_errors || show_num_errors > 0)) { \
|
||||
WARN(1, "%s %s: " format, \
|
||||
dev_driver_string(dev), \
|
||||
dev_name(dev) , ## arg); \
|
||||
|
|
@ -442,6 +498,97 @@ out_err:
|
|||
return -ENOMEM;
|
||||
}
|
||||
|
||||
static ssize_t filter_read(struct file *file, char __user *user_buf,
|
||||
size_t count, loff_t *ppos)
|
||||
{
|
||||
unsigned long flags;
|
||||
char buf[NAME_MAX_LEN + 1];
|
||||
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)
|
||||
{
|
||||
unsigned long flags;
|
||||
char buf[NAME_MAX_LEN];
|
||||
size_t len = NAME_MAX_LEN - 1;
|
||||
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, len);
|
||||
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])
|
||||
printk(KERN_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; ++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;
|
||||
|
||||
printk(KERN_INFO "DMA-API: enable driver filter for driver [%s]\n",
|
||||
current_driver_name);
|
||||
|
||||
out_unlock:
|
||||
write_unlock_irqrestore(&driver_name_lock, flags);
|
||||
|
||||
return count;
|
||||
}
|
||||
|
||||
const struct file_operations filter_fops = {
|
||||
.read = filter_read,
|
||||
.write = filter_write,
|
||||
};
|
||||
|
||||
static int dma_debug_fs_init(void)
|
||||
{
|
||||
dma_debug_dent = debugfs_create_dir("dma-api", NULL);
|
||||
|
|
@ -485,6 +632,11 @@ static int dma_debug_fs_init(void)
|
|||
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:
|
||||
|
|
@ -493,9 +645,60 @@ out_err:
|
|||
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_UNBOUND_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)
|
||||
{
|
||||
/* FIXME: register notifier */
|
||||
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);
|
||||
}
|
||||
|
||||
/*
|
||||
|
|
@ -818,15 +1021,15 @@ void debug_dma_map_sg(struct device *dev, struct scatterlist *sg,
|
|||
entry->type = dma_debug_sg;
|
||||
entry->dev = dev;
|
||||
entry->paddr = sg_phys(s);
|
||||
entry->size = s->length;
|
||||
entry->dev_addr = s->dma_address;
|
||||
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;
|
||||
|
||||
if (!PageHighMem(sg_page(s))) {
|
||||
check_for_stack(dev, sg_virt(s));
|
||||
check_for_illegal_area(dev, sg_virt(s), s->length);
|
||||
check_for_illegal_area(dev, sg_virt(s), sg_dma_len(s));
|
||||
}
|
||||
|
||||
add_dma_entry(entry);
|
||||
|
|
@ -834,13 +1037,32 @@ void debug_dma_map_sg(struct device *dev, struct scatterlist *sg,
|
|||
}
|
||||
EXPORT_SYMBOL(debug_dma_map_sg);
|
||||
|
||||
static int get_nr_mapped_entries(struct device *dev, struct scatterlist *s)
|
||||
{
|
||||
struct dma_debug_entry *entry;
|
||||
struct hash_bucket *bucket;
|
||||
unsigned long flags;
|
||||
int mapped_ents = 0;
|
||||
struct dma_debug_entry ref;
|
||||
|
||||
ref.dev = dev;
|
||||
ref.dev_addr = sg_dma_address(s);
|
||||
ref.size = sg_dma_len(s),
|
||||
|
||||
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);
|
||||
|
||||
return mapped_ents;
|
||||
}
|
||||
|
||||
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;
|
||||
|
|
@ -851,8 +1073,8 @@ void debug_dma_unmap_sg(struct device *dev, struct scatterlist *sglist,
|
|||
.type = dma_debug_sg,
|
||||
.dev = dev,
|
||||
.paddr = sg_phys(s),
|
||||
.dev_addr = s->dma_address,
|
||||
.size = s->length,
|
||||
.dev_addr = sg_dma_address(s),
|
||||
.size = sg_dma_len(s),
|
||||
.direction = dir,
|
||||
.sg_call_ents = 0,
|
||||
};
|
||||
|
|
@ -860,14 +1082,9 @@ void debug_dma_unmap_sg(struct device *dev, struct scatterlist *sglist,
|
|||
if (mapped_ents && i >= mapped_ents)
|
||||
break;
|
||||
|
||||
if (mapped_ents == 0) {
|
||||
struct hash_bucket *bucket;
|
||||
if (!i) {
|
||||
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);
|
||||
mapped_ents = get_nr_mapped_entries(dev, s);
|
||||
}
|
||||
|
||||
check_unmap(&ref);
|
||||
|
|
@ -969,14 +1186,20 @@ void debug_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
|
|||
int nelems, int direction)
|
||||
{
|
||||
struct scatterlist *s;
|
||||
int i;
|
||||
int mapped_ents = 0, 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);
|
||||
if (!i)
|
||||
mapped_ents = get_nr_mapped_entries(dev, s);
|
||||
|
||||
if (i >= mapped_ents)
|
||||
break;
|
||||
|
||||
check_sync(dev, sg_dma_address(s), sg_dma_len(s), 0,
|
||||
direction, true);
|
||||
}
|
||||
}
|
||||
EXPORT_SYMBOL(debug_dma_sync_sg_for_cpu);
|
||||
|
|
@ -985,15 +1208,39 @@ void debug_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
|
|||
int nelems, int direction)
|
||||
{
|
||||
struct scatterlist *s;
|
||||
int i;
|
||||
int mapped_ents = 0, 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);
|
||||
if (!i)
|
||||
mapped_ents = get_nr_mapped_entries(dev, s);
|
||||
|
||||
if (i >= mapped_ents)
|
||||
break;
|
||||
|
||||
check_sync(dev, sg_dma_address(s), sg_dma_len(s), 0,
|
||||
direction, 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])
|
||||
printk(KERN_INFO "DMA-API: enable driver filter for "
|
||||
"driver [%s]\n", current_driver_name);
|
||||
|
||||
|
||||
return 1;
|
||||
}
|
||||
__setup("dma_debug_driver=", dma_debug_driver_setup);
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue