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
1 changed files with 38 additions and 14 deletions
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@ -19,6 +19,7 @@
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#include <linux/scatterlist.h>
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#include <linux/dma-mapping.h>
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#include <linux/stacktrace.h>
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#include <linux/dma-debug.h>
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#include <linux/spinlock.h>
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#include <linux/debugfs.h>
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@ -39,6 +40,8 @@ enum {
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dma_debug_coherent,
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};
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#define DMA_DEBUG_STACKTRACE_ENTRIES 5
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struct dma_debug_entry {
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struct list_head list;
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struct device *dev;
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@ -49,6 +52,10 @@ struct dma_debug_entry {
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int direction;
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int sg_call_ents;
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int sg_mapped_ents;
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#ifdef CONFIG_STACKTRACE
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struct stack_trace stacktrace;
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unsigned long st_entries[DMA_DEBUG_STACKTRACE_ENTRIES];
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#endif
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};
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struct hash_bucket {
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@ -108,12 +115,23 @@ static const char *dir2name[4] = { "DMA_BIDIRECTIONAL", "DMA_TO_DEVICE",
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* system log than the user configured. This variable is
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* writeable via debugfs.
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*/
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#define err_printk(dev, format, arg...) do { \
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static inline void dump_entry_trace(struct dma_debug_entry *entry)
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{
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#ifdef CONFIG_STACKTRACE
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if (entry) {
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printk(KERN_WARNING "Mapped at:\n");
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print_stack_trace(&entry->stacktrace, 0);
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}
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#endif
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}
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#define err_printk(dev, entry, format, arg...) do { \
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error_count += 1; \
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if (show_all_errors || show_num_errors > 0) { \
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WARN(1, "%s %s: " format, \
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dev_driver_string(dev), \
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dev_name(dev) , ## arg); \
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dump_entry_trace(entry); \
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} \
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if (!show_all_errors && show_num_errors > 0) \
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show_num_errors -= 1; \
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@ -260,6 +278,12 @@ static struct dma_debug_entry *dma_entry_alloc(void)
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list_del(&entry->list);
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memset(entry, 0, sizeof(*entry));
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#ifdef CONFIG_STACKTRACE
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entry->stacktrace.max_entries = DMA_DEBUG_STACKTRACE_ENTRIES;
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entry->stacktrace.entries = entry->st_entries;
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entry->stacktrace.skip = 2;
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save_stack_trace(&entry->stacktrace);
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#endif
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num_free_entries -= 1;
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if (num_free_entries < min_free_entries)
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min_free_entries = num_free_entries;
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@ -457,7 +481,7 @@ static void check_unmap(struct dma_debug_entry *ref)
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entry = hash_bucket_find(bucket, ref);
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if (!entry) {
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err_printk(ref->dev, "DMA-API: device driver tries "
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err_printk(ref->dev, NULL, "DMA-API: device driver tries "
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"to free DMA memory it has not allocated "
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"[device address=0x%016llx] [size=%llu bytes]\n",
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ref->dev_addr, ref->size);
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@ -465,7 +489,7 @@ static void check_unmap(struct dma_debug_entry *ref)
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}
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if (ref->size != entry->size) {
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err_printk(ref->dev, "DMA-API: device driver frees "
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err_printk(ref->dev, entry, "DMA-API: device driver frees "
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"DMA memory with different size "
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"[device address=0x%016llx] [map size=%llu bytes] "
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"[unmap size=%llu bytes]\n",
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@ -473,7 +497,7 @@ static void check_unmap(struct dma_debug_entry *ref)
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}
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if (ref->type != entry->type) {
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err_printk(ref->dev, "DMA-API: device driver frees "
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err_printk(ref->dev, entry, "DMA-API: device driver frees "
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"DMA memory with wrong function "
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"[device address=0x%016llx] [size=%llu bytes] "
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"[mapped as %s] [unmapped as %s]\n",
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@ -481,7 +505,7 @@ static void check_unmap(struct dma_debug_entry *ref)
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type2name[entry->type], type2name[ref->type]);
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} else if ((entry->type == dma_debug_coherent) &&
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(ref->paddr != entry->paddr)) {
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err_printk(ref->dev, "DMA-API: device driver frees "
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err_printk(ref->dev, entry, "DMA-API: device driver frees "
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"DMA memory with different CPU address "
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"[device address=0x%016llx] [size=%llu bytes] "
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"[cpu alloc address=%p] [cpu free address=%p]",
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@ -491,7 +515,7 @@ static void check_unmap(struct dma_debug_entry *ref)
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if (ref->sg_call_ents && ref->type == dma_debug_sg &&
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ref->sg_call_ents != entry->sg_call_ents) {
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err_printk(ref->dev, "DMA-API: device driver frees "
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err_printk(ref->dev, entry, "DMA-API: device driver frees "
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"DMA sg list with different entry count "
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"[map count=%d] [unmap count=%d]\n",
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entry->sg_call_ents, ref->sg_call_ents);
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@ -502,7 +526,7 @@ static void check_unmap(struct dma_debug_entry *ref)
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* DMA API don't handle this properly, so check for it here
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*/
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if (ref->direction != entry->direction) {
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err_printk(ref->dev, "DMA-API: device driver frees "
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err_printk(ref->dev, entry, "DMA-API: device driver frees "
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"DMA memory with different direction "
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"[device address=0x%016llx] [size=%llu bytes] "
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"[mapped with %s] [unmapped with %s]\n",
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@ -521,8 +545,8 @@ out:
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static void check_for_stack(struct device *dev, void *addr)
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{
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if (object_is_on_stack(addr))
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err_printk(dev, "DMA-API: device driver maps memory from stack"
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" [addr=%p]\n", addr);
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err_printk(dev, NULL, "DMA-API: device driver maps memory from"
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"stack [addr=%p]\n", addr);
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}
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static void check_sync(struct device *dev, dma_addr_t addr,
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@ -543,7 +567,7 @@ static void check_sync(struct device *dev, dma_addr_t addr,
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entry = hash_bucket_find(bucket, &ref);
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if (!entry) {
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err_printk(dev, "DMA-API: device driver tries "
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err_printk(dev, NULL, "DMA-API: device driver tries "
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"to sync DMA memory it has not allocated "
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"[device address=0x%016llx] [size=%llu bytes]\n",
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addr, size);
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@ -551,7 +575,7 @@ static void check_sync(struct device *dev, dma_addr_t addr,
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}
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if ((offset + size) > entry->size) {
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err_printk(dev, "DMA-API: device driver syncs"
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err_printk(dev, entry, "DMA-API: device driver syncs"
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" DMA memory outside allocated range "
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"[device address=0x%016llx] "
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"[allocation size=%llu bytes] [sync offset=%llu] "
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@ -560,7 +584,7 @@ static void check_sync(struct device *dev, dma_addr_t addr,
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}
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if (direction != entry->direction) {
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err_printk(dev, "DMA-API: device driver syncs "
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err_printk(dev, entry, "DMA-API: device driver syncs "
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"DMA memory with different direction "
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"[device address=0x%016llx] [size=%llu bytes] "
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"[mapped with %s] [synced with %s]\n",
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@ -574,7 +598,7 @@ static void check_sync(struct device *dev, dma_addr_t addr,
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if (to_cpu && !(entry->direction == DMA_FROM_DEVICE) &&
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!(direction == DMA_TO_DEVICE))
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err_printk(dev, "DMA-API: device driver syncs "
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err_printk(dev, entry, "DMA-API: device driver syncs "
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"device read-only DMA memory for cpu "
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"[device address=0x%016llx] [size=%llu bytes] "
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"[mapped with %s] [synced with %s]\n",
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@ -584,7 +608,7 @@ static void check_sync(struct device *dev, dma_addr_t addr,
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if (!to_cpu && !(entry->direction == DMA_TO_DEVICE) &&
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!(direction == DMA_FROM_DEVICE))
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err_printk(dev, "DMA-API: device driver syncs "
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err_printk(dev, entry, "DMA-API: device driver syncs "
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"device write-only DMA memory to device "
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"[device address=0x%016llx] [size=%llu bytes] "
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"[mapped with %s] [synced with %s]\n",
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