drm/i915: Include GT/seqno activity in engine/hangcheck debugfs

Whilst investigating some mysterious failures with hangcheck not running
during gem_busy/basic-hang-default, the question is why did we decide to
cancel the retire_work (which queues the hangcheck)? That decision is
based around GT activity, so include that information in the debug
report.

v2: Include the GT awake status in the error state

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170302150356.9713-1-chris@chris-wilson.co.uk
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 1a28b52..b84ee7a 100644 (file)
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -1361,14 +1361,17 @@ static int i915_hangcheck_info(struct seq_file *m, void *unused)
        } else
                seq_printf(m, "Hangcheck inactive\n");
 
+       seq_printf(m, "GT active? %s\n", yesno(dev_priv->gt.awake));
+
        for_each_engine(engine, dev_priv, id) {
                struct intel_breadcrumbs *b = &engine->breadcrumbs;
                struct rb_node *rb;
 
                seq_printf(m, "%s:\n", engine->name);
-               seq_printf(m, "\tseqno = %x [current %x, last %x]\n",
+               seq_printf(m, "\tseqno = %x [current %x, last %x], inflight %d\n",
                           engine->hangcheck.seqno, seqno[id],
-                          intel_engine_last_submit(engine));
+                          intel_engine_last_submit(engine),
+                          engine->timeline->inflight_seqnos);
                seq_printf(m, "\twaiters? %s, fake irq active? %s, stalled? %s\n",
                           yesno(intel_engine_has_waiter(engine)),
                           yesno(test_bit(engine->id,
@@ -3253,6 +3256,11 @@ static int i915_engine_info(struct seq_file *m, void *unused)
 
        intel_runtime_pm_get(dev_priv);
 
+       seq_printf(m, "GT awake? %s\n",
+                  yesno(dev_priv->gt.awake));
+       seq_printf(m, "Global active requests: %d\n",
+                  dev_priv->gt.active_requests);
+
        for_each_engine(engine, dev_priv, id) {
                struct intel_breadcrumbs *b = &engine->breadcrumbs;
                struct drm_i915_gem_request *rq;
@@ -3260,11 +3268,12 @@ static int i915_engine_info(struct seq_file *m, void *unused)
                u64 addr;
 
                seq_printf(m, "%s\n", engine->name);
-               seq_printf(m, "\tcurrent seqno %x, last %x, hangcheck %x [%d ms]\n",
+               seq_printf(m, "\tcurrent seqno %x, last %x, hangcheck %x [%d ms], inflight %d\n",
                           intel_engine_get_seqno(engine),
                           intel_engine_last_submit(engine),
                           engine->hangcheck.seqno,
-                          jiffies_to_msecs(jiffies - engine->hangcheck.action_timestamp));
+                          jiffies_to_msecs(jiffies - engine->hangcheck.action_timestamp),
+                          engine->timeline->inflight_seqnos);
 
                rcu_read_lock();
 

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 48b34a9..d9f29d1 100644 (file)
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -934,6 +934,7 @@ struct i915_gpu_state {
 
        char error_msg[128];
        bool simulated;
+       bool awake;
        int iommu;
        u32 reset_count;
        u32 suspend_count;

diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c
index 2b1d156..9579770 100644 (file)
--- a/drivers/gpu/drm/i915/i915_gpu_error.c
+++ b/drivers/gpu/drm/i915/i915_gpu_error.c
@@ -632,6 +632,7 @@ int i915_error_state_to_str(struct drm_i915_error_state_buf *m,
                           CSR_VERSION_MINOR(csr->version));
        }
 
+       err_printf(m, "GT awake: %s\n", yesno(error->awake));
        err_printf(m, "EIR: 0x%08x\n", error->eir);
        err_printf(m, "IER: 0x%08x\n", error->ier);
        for (i = 0; i < error->ngtier; i++)
@@ -1615,6 +1616,8 @@ static void i915_error_capture_msg(struct drm_i915_private *dev_priv,
 static void i915_capture_gen_state(struct drm_i915_private *dev_priv,
                                   struct i915_gpu_state *error)
 {
+       error->awake = dev_priv->gt.awake;
+
        error->iommu = -1;
 #ifdef CONFIG_INTEL_IOMMU
        error->iommu = intel_iommu_gfx_mapped;