gpu: ion: Add dump of memory map
Add dump of physical memory map, showing allocated and
free areas, to debugfs interface for heaps with carveout memory.
Change-Id: I9bda9f3e555e55570c95e652616ca1fcc25eb0ab
Signed-off-by: Olav Haugan <ohaugan@codeaurora.org>
diff --git a/drivers/gpu/ion/ion.c b/drivers/gpu/ion/ion.c
index fe9c2ab..56f986d 100644
--- a/drivers/gpu/ion/ion.c
+++ b/drivers/gpu/ion/ion.c
@@ -1674,6 +1674,151 @@
return size;
}
+/**
+ * Searches through a clients handles to find if the buffer is owned
+ * by this client. Used for debug output.
+ * @param client pointer to candidate owner of buffer
+ * @param buf pointer to buffer that we are trying to find the owner of
+ * @return 1 if found, 0 otherwise
+ */
+static int ion_debug_find_buffer_owner(const struct ion_client *client,
+ const struct ion_buffer *buf)
+{
+ struct rb_node *n;
+
+ for (n = rb_first(&client->handles); n; n = rb_next(n)) {
+ const struct ion_handle *handle = rb_entry(n,
+ const struct ion_handle,
+ node);
+ if (handle->buffer == buf)
+ return 1;
+ }
+ return 0;
+}
+
+/**
+ * Adds mem_map_data pointer to the tree of mem_map
+ * Used for debug output.
+ * @param mem_map The mem_map tree
+ * @param data The new data to add to the tree
+ */
+static void ion_debug_mem_map_add(struct rb_root *mem_map,
+ struct mem_map_data *data)
+{
+ struct rb_node **p = &mem_map->rb_node;
+ struct rb_node *parent = NULL;
+ struct mem_map_data *entry;
+
+ while (*p) {
+ parent = *p;
+ entry = rb_entry(parent, struct mem_map_data, node);
+
+ if (data->addr < entry->addr) {
+ p = &(*p)->rb_left;
+ } else if (data->addr > entry->addr) {
+ p = &(*p)->rb_right;
+ } else {
+ pr_err("%s: mem_map_data already found.", __func__);
+ BUG();
+ }
+ }
+ rb_link_node(&data->node, parent, p);
+ rb_insert_color(&data->node, mem_map);
+}
+
+/**
+ * Search for an owner of a buffer by iterating over all ION clients.
+ * @param dev ion device containing pointers to all the clients.
+ * @param buffer pointer to buffer we are trying to find the owner of.
+ * @return name of owner.
+ */
+const char *ion_debug_locate_owner(const struct ion_device *dev,
+ const struct ion_buffer *buffer)
+{
+ struct rb_node *j;
+ const char *client_name = NULL;
+
+ for (j = rb_first(&dev->user_clients); j && !client_name;
+ j = rb_next(j)) {
+ struct ion_client *client = rb_entry(j, struct ion_client,
+ node);
+ if (ion_debug_find_buffer_owner(client, buffer))
+ client_name = client->name;
+ }
+ for (j = rb_first(&dev->kernel_clients); j && !client_name;
+ j = rb_next(j)) {
+ struct ion_client *client = rb_entry(j, struct ion_client,
+ node);
+ if (ion_debug_find_buffer_owner(client, buffer))
+ client_name = client->name;
+ }
+ return client_name;
+}
+
+/**
+ * Create a mem_map of the heap.
+ * @param s seq_file to log error message to.
+ * @param heap The heap to create mem_map for.
+ * @param mem_map The mem map to be created.
+ */
+void ion_debug_mem_map_create(struct seq_file *s, struct ion_heap *heap,
+ struct rb_root *mem_map)
+{
+ struct ion_device *dev = heap->dev;
+ struct rb_node *n;
+
+ for (n = rb_first(&dev->buffers); n; n = rb_next(n)) {
+ struct ion_buffer *buffer =
+ rb_entry(n, struct ion_buffer, node);
+ if (buffer->heap->id == heap->id) {
+ struct mem_map_data *data =
+ kzalloc(sizeof(*data), GFP_KERNEL);
+ if (!data) {
+ seq_printf(s, "ERROR: out of memory. "
+ "Part of memory map will not be logged\n");
+ break;
+ }
+ data->addr = buffer->priv_phys;
+ data->addr_end = buffer->priv_phys + buffer->size-1;
+ data->size = buffer->size;
+ data->client_name = ion_debug_locate_owner(dev, buffer);
+ ion_debug_mem_map_add(mem_map, data);
+ }
+ }
+}
+
+/**
+ * Free the memory allocated by ion_debug_mem_map_create
+ * @param mem_map The mem map to free.
+ */
+static void ion_debug_mem_map_destroy(struct rb_root *mem_map)
+{
+ if (mem_map) {
+ struct rb_node *n;
+ while ((n = rb_first(mem_map)) != 0) {
+ struct mem_map_data *data =
+ rb_entry(n, struct mem_map_data, node);
+ rb_erase(&data->node, mem_map);
+ kfree(data);
+ }
+ }
+}
+
+/**
+ * Print heap debug information.
+ * @param s seq_file to log message to.
+ * @param heap pointer to heap that we will print debug information for.
+ */
+static void ion_heap_print_debug(struct seq_file *s, struct ion_heap *heap)
+{
+ if (heap->ops->print_debug) {
+ struct rb_root mem_map = RB_ROOT;
+ ion_debug_mem_map_create(s, heap, &mem_map);
+ heap->ops->print_debug(heap, s, &mem_map);
+ ion_debug_mem_map_destroy(&mem_map);
+ }
+}
+
static int ion_debug_heap_show(struct seq_file *s, void *unused)
{
struct ion_heap *heap = s->private;
@@ -1704,8 +1849,7 @@
seq_printf(s, "%16.s %16u %16x\n", client->name, client->pid,
size);
}
- if (heap->ops->print_debug)
- heap->ops->print_debug(heap, s);
+ ion_heap_print_debug(s, heap);
mutex_unlock(&dev->lock);
return 0;
}