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Date: Fri, 6 Mar 2009 14:30:29 +0100
From: Joerg Roedel <joerg.roedel@....com>
To: mingo@...hat.com
CC: linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org,
David Woodhouse <dwmw2@...radead.org>,
Joerg Roedel <joerg.roedel@....com>
Subject: [PATCH 18/18] dma-debug: print stacktrace of mapping path on unmap error
From: David Woodhouse <dwmw2@...radead.org>
Impact: saves stacktrace of a dma mapping and prints it if there is an error
Signed-off-by: David Woodhouse <dwmw2@...radead.org>
Signed-off-by: Joerg Roedel <joerg.roedel@....com>
---
lib/dma-debug.c | 52 ++++++++++++++++++++++++++++++++++++++--------------
1 files changed, 38 insertions(+), 14 deletions(-)
diff --git a/lib/dma-debug.c b/lib/dma-debug.c
index 1b6b650..128d9de 100644
--- a/lib/dma-debug.c
+++ b/lib/dma-debug.c
@@ -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 @@ out:
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",
--
1.5.6.4
--
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