[PATCH 15/18] drm/i915: Debugfs support for GuC logging control

akash.goel
2016-08-15T14:36:43Z

From: Sagar Arun Kamble <sagar.a.kamble@intel.com>

This patch provides debugfs interface i915_guc_output_control for
on the fly enabling/disabling of logging in GuC firmware and controlling
the verbosity level of logs.
The value written to the file, should have bit 0 set to enable logging and
bits 4-7 should contain the verbosity info.

v2: Add a forceful flush, to collect left over logs, on disabling logging.
Useful for Validation.

v3: Besides minor cleanup, implement read method for the debugfs file and
set the guc_log_level to -1 when logging is disabled. (Tvrtko)

v4: Minor cleanup & rebase. (Tvrtko)

Signed-off-by: Sagar Arun Kamble <sagar.a.kamble@intel.com>
Signed-off-by: Akash Goel <akash.goel@intel.com>
---
drivers/gpu/drm/i915/i915_debugfs.c | 44 ++++++++++++++++++++-
drivers/gpu/drm/i915/i915_guc_submission.c | 62 ++++++++++++++++++++++++++++++
drivers/gpu/drm/i915/intel_guc.h | 1 +
3 files changed, 106 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index aaa51bc..bfc22bf 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -2626,6 +2626,47 @@ static int i915_guc_log_dump(struct seq_file *m, void *data)
return 0;
}

+static int i915_guc_log_control_get(void *data, u64 *val)
+{
+ struct drm_device *dev = data;
+ struct drm_i915_private *dev_priv = to_i915(dev);
+
+ if (!dev_priv->guc.log.vma)
+ return -EINVAL;
+
+ *val = i915.guc_log_level;
+
+ return 0;
+}
+
+static int i915_guc_log_control_set(void *data, u64 val)
+{
+ struct drm_device *dev = data;
+ struct drm_i915_private *dev_priv = to_i915(dev);
+ int ret;
+
+ ret = mutex_lock_interruptible(&dev->struct_mutex);
+ if (ret)
+ return ret;
+
+ if (!dev_priv->guc.log.vma) {
+ ret = -EINVAL;
+ goto end;
+ }
+
+ intel_runtime_pm_get(dev_priv);
+ ret = i915_guc_log_control(dev_priv, val);
+ intel_runtime_pm_put(dev_priv);
+
+end:
+ mutex_unlock(&dev->struct_mutex);
+ return ret;
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(i915_guc_log_control_fops,
+ i915_guc_log_control_get, i915_guc_log_control_set,
+ "%lld\n");
+
static int i915_edp_psr_status(struct seq_file *m, void *data)
{
struct drm_info_node *node = m->private;
@@ -5436,7 +5477,8 @@ static const struct i915_debugfs_files {
{"i915_fbc_false_color", &i915_fbc_fc_fops},
{"i915_dp_test_data", &i915_displayport_test_data_fops},
{"i915_dp_test_type", &i915_displayport_test_type_fops},
- {"i915_dp_test_active", &i915_displayport_test_active_fops}
+ {"i915_dp_test_active", &i915_displayport_test_active_fops},
+ {"i915_guc_log_control", &i915_guc_log_control_fops}
};

void intel_display_crc_init(struct drm_device *dev)
diff --git a/drivers/gpu/drm/i915/i915_guc_submission.c b/drivers/gpu/drm/i915/i915_guc_submission.c
index 85df2f3..be6c727 100644
--- a/drivers/gpu/drm/i915/i915_guc_submission.c
+++ b/drivers/gpu/drm/i915/i915_guc_submission.c
@@ -195,6 +195,16 @@ static int host2guc_force_logbuffer_flush(struct intel_guc *guc)
return host2guc_action(guc, data, 2);
}

+static int host2guc_logging_control(struct intel_guc *guc, u32 control_val)
+{
+ u32 data[2];
+
+ data[0] = HOST2GUC_ACTION_UK_LOG_ENABLE_LOGGING;
+ data[1] = control_val;
+
+ return host2guc_action(guc, data, 2);
+}
+
/*
* Initialise, update, or clear doorbell data shared with the GuC
*
@@ -1585,3 +1595,55 @@ void i915_guc_register(struct drm_i915_private *dev_priv)
guc_log_late_setup(&dev_priv->guc);
mutex_unlock(&dev_priv->drm.struct_mutex);
}
+
+int i915_guc_log_control(struct drm_i915_private *dev_priv, u64 control_val)
+{
+ union guc_log_control log_param;
+ int ret;
+
+ log_param.value = control_val;
+
+ if (log_param.verbosity < GUC_LOG_VERBOSITY_MIN ||
+ log_param.verbosity > GUC_LOG_VERBOSITY_MAX)
+ return -EINVAL;
+
+ /* This combination doesn't make sense & won't have any effect */
+ if (!log_param.logging_enabled && (i915.guc_log_level < 0))
+ return 0;
+
+ ret = host2guc_logging_control(&dev_priv->guc, log_param.value);
+ if (ret < 0) {
+ DRM_DEBUG_DRIVER("host2guc action failed %d\n", ret);
+ return ret;
+ }
+
+ i915.guc_log_level = log_param.verbosity;
+
+ /* If log_level was set as -1 at boot time, then the relay channel file
+ * wouldn't have been created by now and interrupts also would not have
+ * been enabled.
+ */
+ if (!dev_priv->guc.log.relay_chan) {
+ ret = guc_log_late_setup(&dev_priv->guc);
+ if (!ret)
+ gen9_enable_guc_interrupts(dev_priv);
+ } else if (!log_param.logging_enabled) {
+ /* Once logging is disabled, GuC won't generate logs & send an
+ * interrupt. But there could be some data in the log buffer
+ * which is yet to be captured. So request GuC to update the log
+ * buffer state and then collect the left over logs.
+ */
+ i915_guc_flush_logs(dev_priv, true);
+
+ /* GuC would have updated log buffer by now, so capture it */
+ i915_guc_capture_logs(dev_priv);
+
+ /* As logging is disabled, update log level to reflect that */
+ i915.guc_log_level = -1;
+ } else {
+ /* In case interrupts were disabled, enable them now */
+ gen9_enable_guc_interrupts(dev_priv);
+ }
+
+ return ret;
+}
diff --git a/drivers/gpu/drm/i915/intel_guc.h b/drivers/gpu/drm/i915/intel_guc.h
index d7eda42..b56fe24 100644
--- a/drivers/gpu/drm/i915/intel_guc.h
+++ b/drivers/gpu/drm/i915/intel_guc.h
@@ -185,5 +185,6 @@ void i915_guc_capture_logs(struct drm_i915_private *dev_priv);
void i915_guc_flush_logs(struct drm_i915_private *dev_priv, bool can_wait);
void i915_guc_register(struct drm_i915_private *dev_priv);
void i915_guc_unregister(struct drm_i915_private *dev_priv);
+int i915_guc_log_control(struct drm_i915_private *dev_priv, u64 control_val);

#endif
--
1.9.2