mirror of
https://github.com/team-infusion-developers/android_kernel_samsung_msm8976.git
synced 2024-09-21 11:53:01 +00:00
dma-debug: add core checking functions
Impact: add functions to check on dma unmap and sync Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Joerg Roedel
parent
788dcfa6f1
commit
2d62ece14f
188
lib/dma-debug.c
188
lib/dma-debug.c
|
|
@ -17,10 +17,13 @@
|
|||
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
||||
*/
|
||||
|
||||
#include <linux/dma-mapping.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>
|
||||
|
||||
|
|
@ -50,7 +53,7 @@ struct dma_debug_entry {
|
|||
struct hash_bucket {
|
||||
struct list_head list;
|
||||
spinlock_t lock;
|
||||
} __cacheline_aligned_in_smp;
|
||||
} ____cacheline_aligned_in_smp;
|
||||
|
||||
/* Hash list to save the allocated dma addresses */
|
||||
static struct hash_bucket dma_entry_hash[HASH_SIZE];
|
||||
|
|
@ -85,6 +88,36 @@ 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.
|
||||
*/
|
||||
#define err_printk(dev, 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); \
|
||||
} \
|
||||
if (!show_all_errors && show_num_errors > 0) \
|
||||
show_num_errors -= 1; \
|
||||
} while (0);
|
||||
|
||||
/*
|
||||
* Hash related functions
|
||||
*
|
||||
|
|
@ -380,3 +413,156 @@ static __init int dma_debug_entries_cmdline(char *str)
|
|||
__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, "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, "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, "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, "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, "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, "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, "DMA-API: device driver maps memory from stack"
|
||||
" [addr=%p]\n", addr);
|
||||
}
|
||||
|
||||
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, "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, "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, "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, "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, "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);
|
||||
|
||||
}
|
||||
|
||||
|
|
|
|||
Loading…
Reference in a new issue