[CI 10/10] drm/i915/debugfs: Show context objects in i915_gem_objects

Chris Wilson
2016-05-24T13:54:04Z

One of the uses for i915_gem_objects is pin-pointing leaks. For this, we
can compare the number of allocated objects and who owns them, a
discrepancy here often indicates a kernel bug. One allocator of unreported
objects is for backing context objects, so include those in the listing.

v2: Take filelist_mutex which requires a little dance with struct_mutex
to avoid nesting filelist_mutex inside struct_mutex.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
---
drivers/gpu/drm/i915/i915_debugfs.c | 38 ++++++++++++++++++++++++++++++++++++-
1 file changed, 37 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 95a871b8f379..17e2b1a1c4ad 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -417,6 +417,42 @@ static void print_batch_pool_stats(struct seq_file *m,
print_file_stats(m, "[k]batch pool", stats);
}

+static int per_file_ctx_stats(int id, void *ptr, void *data)
+{
+ struct i915_gem_context *ctx = ptr;
+ int n;
+
+ for (n = 0; n < ARRAY_SIZE(ctx->engine); n++) {
+ if (ctx->engine[n].state)
+ per_file_stats(0, ctx->engine[n].state, data);
+ if (ctx->engine[n].ringbuf)
+ per_file_stats(0, ctx->engine[n].ringbuf->obj, data);
+ }
+
+ return 0;
+}
+
+static void print_context_stats(struct seq_file *m,
+ struct drm_i915_private *dev_priv)
+{
+ struct file_stats stats;
+ struct drm_file *file;
+
+ memset(&stats, 0, sizeof(stats));
+
+ mutex_lock(&dev_priv->dev->struct_mutex);
+ if (dev_priv->kernel_context)
+ per_file_ctx_stats(0, dev_priv->kernel_context, &stats);
+
+ list_for_each_entry(file, &dev_priv->dev->filelist, lhead) {
+ struct drm_i915_file_private *fpriv = file->driver_priv;
+ idr_for_each(&fpriv->context_idr, per_file_ctx_stats, &stats);
+ }
+ mutex_unlock(&dev_priv->dev->struct_mutex);
+
+ print_file_stats(m, "[k]contexts", stats);
+}
+
#define count_vmas(list, member) do { \
list_for_each_entry(vma, list, member) { \
size += i915_gem_obj_total_ggtt_size(vma->obj); \
@@ -521,10 +557,10 @@ static int i915_gem_object_info(struct seq_file *m, void* data)

seq_putc(m, '\n');
print_batch_pool_stats(m, dev_priv);
-
mutex_unlock(&dev->struct_mutex);

mutex_lock(&dev->filelist_mutex);
+ print_context_stats(m, dev_priv);
list_for_each_entry_reverse(file, &dev->filelist, lhead) {
struct file_stats stats;
struct task_struct *task;