[2/7] drm/ttm: Add debugfs output entry to pool allocator.

Commit Message

Pauli Nieminen March 17, 2010, 8:50 p.m. UTC

None

Patch

diff --git a/drivers/gpu/drm/ttm/ttm_page_alloc.c b/drivers/gpu/drm/ttm/ttm_page_alloc.c
index 768d479..206bee9 100644
--- a/drivers/gpu/drm/ttm/ttm_page_alloc.c
+++ b/drivers/gpu/drm/ttm/ttm_page_alloc.c
@@ -34,6 +34,7 @@ 
 #include <linux/spinlock.h>
 #include <linux/highmem.h>
 #include <linux/mm_types.h>
+#include <linux/module.h>
 #include <linux/jiffies.h>
 #include <linux/timer.h>
 #include <linux/workqueue.h>
@@ -73,6 +74,9 @@  struct ttm_page_pool {
 	unsigned		npages;
 	unsigned		nlowpages;
 	unsigned		alloc_size;
+	char			*name;
+	unsigned long		nfrees;
+	unsigned long		nrefills;
 };
 
 #define NUM_POOLS 4
@@ -240,6 +244,7 @@  static bool ttm_page_pool_free_pages_locked(struct ttm_page_pool *pool,
 {
 	unsigned tmp;
 	pool->npages -= freed_pages;
+	pool->nfrees += freed_pages;
 	/* Calculate number of pages taken from nlowpages
 	 * npages_to_free = 1/2*nlowpages =>
 	 * nlowpages_delta = 2*freed_pages
@@ -320,6 +325,7 @@  restart:
 	}
 
 	pool->npages -= freed_pages;
+	pool->nfrees += freed_pages;
 	/* set nlowpages to zero to prevent extra freeing in thsi patch.
 	 * nlowpages is reseted later after all work has been finnished.
 	 **/
@@ -537,6 +543,7 @@  static void ttm_page_pool_fill_locked(struct ttm_page_pool *pool,
 
 		if (!r) {
 			list_splice(&new_pages, &pool->list);
+			++pool->nrefills;
 			pool->npages += pool->alloc_size;
 			/* Have to remmber to update the low number of pages
 			 * too */
@@ -724,14 +731,16 @@  void ttm_put_pages(struct list_head *pages, int flags,
 				round_jiffies(_manager.free_interval));
 }
 
-static void ttm_page_pool_init_locked(struct ttm_page_pool *pool, int flags)
+static void ttm_page_pool_init_locked(struct ttm_page_pool *pool, int flags,
+		char *name)
 {
 	spin_lock_init(&pool->lock);
 	pool->fill_lock = false;
 	INIT_LIST_HEAD(&pool->list);
-	pool->npages = pool->nlowpages = 0;
+	pool->npages = pool->nlowpages = pool->nfrees = 0;
 	pool->alloc_size = NUM_PAGES_TO_ALLOC;
 	pool->gfp_flags = flags;
+	pool->name = name;
 }
 
 int ttm_page_alloc_init(struct ttm_mem_global *glob)
@@ -741,13 +750,15 @@  int ttm_page_alloc_init(struct ttm_mem_global *glob)
 
 	printk(KERN_INFO "[ttm] Initializing pool allocator.\n");
 
-	ttm_page_pool_init_locked(&_manager.wc_pool, GFP_HIGHUSER);
+	ttm_page_pool_init_locked(&_manager.wc_pool, GFP_HIGHUSER, "wc");
 
-	ttm_page_pool_init_locked(&_manager.uc_pool, GFP_HIGHUSER);
+	ttm_page_pool_init_locked(&_manager.uc_pool, GFP_HIGHUSER, "uc");
 
-	ttm_page_pool_init_locked(&_manager.wc_pool_dma32, GFP_USER | GFP_DMA32);
+	ttm_page_pool_init_locked(&_manager.wc_pool_dma32, GFP_USER | GFP_DMA32,
+			"wc dma");
 
-	ttm_page_pool_init_locked(&_manager.uc_pool_dma32, GFP_USER | GFP_DMA32);
+	ttm_page_pool_init_locked(&_manager.uc_pool_dma32, GFP_USER | GFP_DMA32,
+			"uc dma");
 
 	_manager.free_interval = msecs_to_jiffies(PAGE_FREE_INTERVAL);
 	_manager.small_allocation = SMALL_ALLOCATION;
@@ -773,3 +784,26 @@  void ttm_page_alloc_fini()
 	for (i = 0; i < NUM_POOLS; ++i)
 		ttm_page_pool_free(&_manager.pools[i], FREE_ALL_PAGES);
 }
+
+int ttm_page_alloc_debugfs(struct seq_file *m, void *data)
+{
+	struct ttm_page_pool *p;
+	unsigned i;
+	char *h[] = {"pool", "refills", "pages freed", "size", "min size"};
+	if (atomic_read(&_manager.page_alloc_inited) == 0) {
+		seq_printf(m, "No pool allocator running.\n");
+		return 0;
+	}
+	seq_printf(m, "%6s %12s %13s %8s %8s\n",
+			h[0], h[1], h[2], h[3], h[4]);
+	for (i = 0; i < NUM_POOLS; ++i) {
+		p = &_manager.pools[i];
+
+		seq_printf(m, "%6s %12ld %13ld %8d %8d\n",
+				p->name, p->nrefills,
+				p->nfrees, p->npages,
+				p->nlowpages);
+	}
+	return 0;
+}
+EXPORT_SYMBOL(ttm_page_alloc_debugfs);
diff --git a/include/drm/ttm/ttm_page_alloc.h b/include/drm/ttm/ttm_page_alloc.h
index 485514a..2df0caa 100644
--- a/include/drm/ttm/ttm_page_alloc.h
+++ b/include/drm/ttm/ttm_page_alloc.h
@@ -61,4 +61,8 @@  int ttm_page_alloc_init(struct ttm_mem_global *glob);
  */
 void ttm_page_alloc_fini(void);
 
+/**
+ * Output the state of pools to debugfs file
+ */
+extern int ttm_page_alloc_debugfs(struct seq_file *m, void *data);
 #endif