dma-debug: print stacktrace of mapping path on unmap error
Impact: saves stacktrace of a dma mapping and prints it if there is an error Signed-off-by: David Woodhouse <dwmw2@infradead.org> Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
David Woodhouse
Joerg Roedel
parent
187f9c3f05
commit
6c132d1bcd
@ -19,6 +19,7 @@
|
||||
|
||||
#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>
|
||||
@ -39,6 +40,8 @@ enum {
|
||||
dma_debug_coherent,
|
||||
};
|
||||
|
||||
#define DMA_DEBUG_STACKTRACE_ENTRIES 5
|
||||
|
||||
struct dma_debug_entry {
|
||||
struct list_head list;
|
||||
struct device *dev;
|
||||
@ -49,6 +52,10 @@ struct dma_debug_entry {
|
||||
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 {
|
||||
@ -108,12 +115,23 @@ static const char *dir2name[4] = { "DMA_BIDIRECTIONAL", "DMA_TO_DEVICE",
|
||||
* system log than the user configured. This variable is
|
||||
* writeable via debugfs.
|
||||
*/
|
||||
#define err_printk(dev, format, arg...) do { \
|
||||
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; \
|
||||
@ -260,6 +278,12 @@ static struct dma_debug_entry *dma_entry_alloc(void)
|
||||
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;
|
||||
@ -457,7 +481,7 @@ static void check_unmap(struct dma_debug_entry *ref)
|
||||
entry = hash_bucket_find(bucket, ref);
|
||||
|
||||
if (!entry) {
|
||||
err_printk(ref->dev, "DMA-API: device driver tries "
|
||||
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);
|
||||
@ -465,7 +489,7 @@ static void check_unmap(struct dma_debug_entry *ref)
|
||||
}
|
||||
|
||||
if (ref->size != entry->size) {
|
||||
err_printk(ref->dev, "DMA-API: device driver frees "
|
||||
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",
|
||||
@ -473,7 +497,7 @@ static void check_unmap(struct dma_debug_entry *ref)
|
||||
}
|
||||
|
||||
if (ref->type != entry->type) {
|
||||
err_printk(ref->dev, "DMA-API: device driver frees "
|
||||
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",
|
||||
@ -481,7 +505,7 @@ static void check_unmap(struct dma_debug_entry *ref)
|
||||
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 "
|
||||
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]",
|
||||
@ -491,7 +515,7 @@ static void check_unmap(struct dma_debug_entry *ref)
|
||||
|
||||
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 "
|
||||
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);
|
||||
@ -502,7 +526,7 @@ static void check_unmap(struct dma_debug_entry *ref)
|
||||
* 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 "
|
||||
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",
|
||||
@ -521,8 +545,8 @@ static void check_unmap(struct dma_debug_entry *ref)
|
||||
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);
|
||||
err_printk(dev, NULL, "DMA-API: device driver maps memory from"
|
||||
"stack [addr=%p]\n", addr);
|
||||
}
|
||||
|
||||
static void check_sync(struct device *dev, dma_addr_t addr,
|
||||
@ -543,7 +567,7 @@ static void check_sync(struct device *dev, dma_addr_t addr,
|
||||
entry = hash_bucket_find(bucket, &ref);
|
||||
|
||||
if (!entry) {
|
||||
err_printk(dev, "DMA-API: device driver tries "
|
||||
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);
|
||||
@ -551,7 +575,7 @@ static void check_sync(struct device *dev, dma_addr_t addr,
|
||||
}
|
||||
|
||||
if ((offset + size) > entry->size) {
|
||||
err_printk(dev, "DMA-API: device driver syncs"
|
||||
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] "
|
||||
@ -560,7 +584,7 @@ static void check_sync(struct device *dev, dma_addr_t addr,
|
||||
}
|
||||
|
||||
if (direction != entry->direction) {
|
||||
err_printk(dev, "DMA-API: device driver syncs "
|
||||
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",
|
||||
@ -574,7 +598,7 @@ static void check_sync(struct device *dev, dma_addr_t addr,
|
||||
|
||||
if (to_cpu && !(entry->direction == DMA_FROM_DEVICE) &&
|
||||
!(direction == DMA_TO_DEVICE))
|
||||
err_printk(dev, "DMA-API: device driver syncs "
|
||||
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",
|
||||
@ -584,7 +608,7 @@ static void check_sync(struct device *dev, dma_addr_t addr,
|
||||
|
||||
if (!to_cpu && !(entry->direction == DMA_TO_DEVICE) &&
|
||||
!(direction == DMA_FROM_DEVICE))
|
||||
err_printk(dev, "DMA-API: device driver syncs "
|
||||
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",
|
||||
|
||||
Loading…
Reference in New Issue
Block a user