dma-debug: be more careful when building reference entries

The current code is not very careful when it builds reference
dma_debug_entries which get passed to hash_bucket_find(). But since this
function changed to a best-fit algorithm these entries have to be more
acurate. This patch adds this higher level of accuracy.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

1 files changed, 91 insertions, 43 deletions

diff --git a/lib/dma-debug.c b/lib/dma-debug.c
index c71e2dd2750f..3b93129a968c 100644
--- a/lib/dma-debug.c
+++ b/lib/dma-debug.c
@@ -874,72 +874,68 @@ static void check_for_illegal_area(struct device *dev, void *addr, u64 size)
                                 "[addr=%p] [size=%llu]\n", addr, size);
 }
 
-static void check_sync(struct device *dev, dma_addr_t addr,
-                       u64 size, u64 offset, int direction, bool to_cpu)
+static void check_sync(struct device *dev,
+                       struct dma_debug_entry *ref,
+                       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);
+        bucket = get_hash_bucket(ref, &flags);
 
-        entry = hash_bucket_find(bucket, &ref);
+        entry = hash_bucket_find(bucket, ref);
 
         if (!entry) {
                 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",
-                                (unsigned long long)addr, size);
+                                (unsigned long long)ref->dev_addr, ref->size);
                 goto out;
         }
 
-        if ((offset + size) > entry->size) {
+        if (ref->size > entry->size) {
                 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] "
-                                "[sync size=%llu]\n", entry->dev_addr, entry->size,
-                                offset, size);
+                                "[allocation size=%llu bytes] "
+                                "[sync offset+size=%llu]\n",
+                                entry->dev_addr, entry->size,
+                                ref->size);
         }
 
-        if (direction != entry->direction) {
+        if (ref->direction != entry->direction) {
                 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",
-                                (unsigned long long)addr, entry->size,
+                                (unsigned long long)ref->dev_addr, entry->size,
                                 dir2name[entry->direction],
-                                dir2name[direction]);
+                                dir2name[ref->direction]);
         }
 
         if (entry->direction == DMA_BIDIRECTIONAL)
                 goto out;
 
         if (to_cpu && !(entry->direction == DMA_FROM_DEVICE) &&
-                      !(direction == DMA_TO_DEVICE))
+                      !(ref->direction == DMA_TO_DEVICE))
                 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",
-                                (unsigned long long)addr, entry->size,
+                                (unsigned long long)ref->dev_addr, entry->size,
                                 dir2name[entry->direction],
-                                dir2name[direction]);
+                                dir2name[ref->direction]);
 
         if (!to_cpu && !(entry->direction == DMA_TO_DEVICE) &&
-                       !(direction == DMA_FROM_DEVICE))
+                       !(ref->direction == DMA_FROM_DEVICE))
                 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",
-                                (unsigned long long)addr, entry->size,
+                                (unsigned long long)ref->dev_addr, entry->size,
                                 dir2name[entry->direction],
-                                dir2name[direction]);
+                                dir2name[ref->direction]);
 
 out:
         put_hash_bucket(bucket, &flags);
@@ -1037,19 +1033,16 @@ 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)
+static int get_nr_mapped_entries(struct device *dev,
+                                 struct dma_debug_entry *ref)
 {
-        struct dma_debug_entry *entry, ref;
+        struct dma_debug_entry *entry;
         struct hash_bucket *bucket;
         unsigned long flags;
         int mapped_ents;
 
-        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);
+        bucket       = get_hash_bucket(ref, &flags);
+        entry        = hash_bucket_find(bucket, ref);
         mapped_ents  = 0;
 
         if (entry)
@@ -1084,7 +1077,7 @@ void debug_dma_unmap_sg(struct device *dev, struct scatterlist *sglist,
                         break;
 
                 if (!i)
-                        mapped_ents = get_nr_mapped_entries(dev, s);
+                        mapped_ents = get_nr_mapped_entries(dev, &ref);
 
                 check_unmap(&ref);
         }
@@ -1139,10 +1132,19 @@ EXPORT_SYMBOL(debug_dma_free_coherent);
 void debug_dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
                                    size_t size, int direction)
 {
+        struct dma_debug_entry ref;
+
         if (unlikely(global_disable))
                 return;
 
-        check_sync(dev, dma_handle, size, 0, direction, true);
+        ref.type         = dma_debug_single;
+        ref.dev          = dev;
+        ref.dev_addr     = dma_handle;
+        ref.size         = size;
+        ref.direction    = direction;
+        ref.sg_call_ents = 0;
+
+        check_sync(dev, &ref, true);
 }
 EXPORT_SYMBOL(debug_dma_sync_single_for_cpu);
 
@@ -1150,10 +1152,19 @@ void debug_dma_sync_single_for_device(struct device *dev,
                                       dma_addr_t dma_handle, size_t size,
                                       int direction)
 {
+        struct dma_debug_entry ref;
+
         if (unlikely(global_disable))
                 return;
 
-        check_sync(dev, dma_handle, size, 0, direction, false);
+        ref.type         = dma_debug_single;
+        ref.dev          = dev;
+        ref.dev_addr     = dma_handle;
+        ref.size         = size;
+        ref.direction    = direction;
+        ref.sg_call_ents = 0;
+
+        check_sync(dev, &ref, false);
 }
 EXPORT_SYMBOL(debug_dma_sync_single_for_device);
 
@@ -1162,10 +1173,19 @@ void debug_dma_sync_single_range_for_cpu(struct device *dev,
                                          unsigned long offset, size_t size,
                                          int direction)
 {
+        struct dma_debug_entry ref;
+
         if (unlikely(global_disable))
                 return;
 
-        check_sync(dev, dma_handle, size, offset, direction, true);
+        ref.type         = dma_debug_single;
+        ref.dev          = dev;
+        ref.dev_addr     = dma_handle;
+        ref.size         = offset + size;
+        ref.direction    = direction;
+        ref.sg_call_ents = 0;
+
+        check_sync(dev, &ref, true);
 }
 EXPORT_SYMBOL(debug_dma_sync_single_range_for_cpu);
 
@@ -1174,10 +1194,19 @@ void debug_dma_sync_single_range_for_device(struct device *dev,
                                             unsigned long offset,
                                             size_t size, int direction)
 {
+        struct dma_debug_entry ref;
+
         if (unlikely(global_disable))
                 return;
 
-        check_sync(dev, dma_handle, size, offset, direction, false);
+        ref.type         = dma_debug_single;
+        ref.dev          = dev;
+        ref.dev_addr     = dma_handle;
+        ref.size         = offset + size;
+        ref.direction    = direction;
+        ref.sg_call_ents = 0;
+
+        check_sync(dev, &ref, false);
 }
 EXPORT_SYMBOL(debug_dma_sync_single_range_for_device);
 
@@ -1191,14 +1220,24 @@ void debug_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
                 return;
 
         for_each_sg(sg, s, nelems, i) {
+
+                struct dma_debug_entry ref = {
+                        .type           = dma_debug_sg,
+                        .dev            = dev,
+                        .paddr          = sg_phys(s),
+                        .dev_addr       = sg_dma_address(s),
+                        .size           = sg_dma_len(s),
+                        .direction      = direction,
+                        .sg_call_ents   = nelems,
+                };
+
                 if (!i)
-                        mapped_ents = get_nr_mapped_entries(dev, s);
+                        mapped_ents = get_nr_mapped_entries(dev, &ref);
 
                 if (i >= mapped_ents)
                         break;
 
-                check_sync(dev, sg_dma_address(s), sg_dma_len(s), 0,
-                           direction, true);
+                check_sync(dev, &ref, true);
         }
 }
 EXPORT_SYMBOL(debug_dma_sync_sg_for_cpu);
@@ -1213,14 +1252,23 @@ void debug_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
                 return;
 
         for_each_sg(sg, s, nelems, i) {
+
+                struct dma_debug_entry ref = {
+                        .type           = dma_debug_sg,
+                        .dev            = dev,
+                        .paddr          = sg_phys(s),
+                        .dev_addr       = sg_dma_address(s),
+                        .size           = sg_dma_len(s),
+                        .direction      = direction,
+                        .sg_call_ents   = nelems,
+                };
                 if (!i)
-                        mapped_ents = get_nr_mapped_entries(dev, s);
+                        mapped_ents = get_nr_mapped_entries(dev, &ref);
 
                 if (i >= mapped_ents)
                         break;
 
-                check_sync(dev, sg_dma_address(s), sg_dma_len(s), 0,
-                           direction, false);
+                check_sync(dev, &ref, false);
         }
 }
 EXPORT_SYMBOL(debug_dma_sync_sg_for_device);