From: "Siluvery, Arun" <arun.siluvery@xxxxxxxxx>
This patch adds changes to keep track of the number of the times TDR is
triggered and the results for each ring are made available through debugfs.
Signed-off-by: Siluvery, Arun <arun.siluvery@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_debugfs.c | 62 +++++++++++++++++++++++++++++++++++++
drivers/gpu/drm/i915/i915_drv.h | 3 ++
drivers/gpu/drm/i915/i915_irq.c | 1 +
3 files changed, 66 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 0e5bcb4..1556346 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -2796,6 +2796,67 @@ DEFINE_SIMPLE_ATTRIBUTE(i915_drop_caches_fops,
i915_drop_caches_get, i915_drop_caches_set,
"0x%08llx\n");
+static ssize_t
+i915_ring_hangcheck_read(struct file *filp,
+ char __user *ubuf,
+ size_t max,
+ loff_t *ppos)
+{
+ /* Returns the total number of times the rings
+ * have hung and been reset since boot */
+ struct drm_device *dev = filp->private_data;
+ drm_i915_private_t *dev_priv = dev->dev_private;
+ char buf[200];
+ int len;
+
+ len = snprintf(buf, sizeof(buf),
+ "GPU=0x%08X,RCS_T=0x%08X,VCS_T=0x%08X,BCS_T=0x%08X,VECS_T=0x%08X\n",
+ dev_priv->total_resets,
+ dev_priv->hangcheck[RCS].tdr_count,
+ dev_priv->hangcheck[VCS].tdr_count,
+ dev_priv->hangcheck[BCS].tdr_count,
+ dev_priv->hangcheck[VECS].tdr_count);
+
+ if (len > sizeof(buf))
+ len = sizeof(buf);
+
+ return simple_read_from_buffer(ubuf, max, ppos, buf, len);
+}
+
+static ssize_t
+i915_ring_hangcheck_write(struct file *filp,
+ const char __user *ubuf,
+ size_t cnt,
+ loff_t *ppos)
+{
+ struct drm_device *dev = filp->private_data;
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ int ret;
+ uint32_t i;
+
+ ret = mutex_lock_interruptible(&dev->struct_mutex);
+ if (ret)
+ return ret;
+
+ for (i = 0; i < I915_NUM_RINGS; i++) {
+ /* Reset the hangcheck counters */
+ dev_priv->hangcheck[i].tdr_count = 0;
+ }
+ dev_priv->total_resets = 0;
+
+ mutex_unlock(&dev->struct_mutex);
+
+ return cnt;
+}
+
+static const struct file_operations i915_ring_hangcheck_fops = {
+ .owner = THIS_MODULE,
+ .open = simple_open,
+ .read = i915_ring_hangcheck_read,
+ .write = i915_ring_hangcheck_write,
+ .llseek = default_llseek,
+};
+
static int
i915_max_freq_get(void *data, u64 *val)
{
@@ -3098,6 +3159,7 @@ static const struct i915_debugfs_files {
{"i915_error_state", &i915_error_state_fops},
{"i915_next_seqno", &i915_next_seqno_fops},
{"i915_display_crc_ctl", &i915_display_crc_ctl_fops},
+ {"i915_ring_hangcheck", &i915_ring_hangcheck_fops},
};
void intel_display_crc_init(struct drm_device *dev)
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index c539509..27225d6 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1347,6 +1347,9 @@ struct intel_hangcheck {
/* Keep a record of the last time the ring was reset */
unsigned long last_reset;
+
+ /* Number of TDR hang detections for this ring */
+ uint32_t tdr_count;
};
typedef struct drm_i915_private {
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 78b2cbb..378383a 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -2517,6 +2517,7 @@ static bool i915_hangcheck_hung(struct intel_hangcheck *hc)
DRM_DEBUG_TDR("hung=%d after kick ring\n", hung);
}
if (hung) {
+ hc->tdr_count++;
i915_handle_error(dev, hc);
}
return hung;
--
1.8.4
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