Re: [PATCH 08/13 v4] drm/i915: Enable GuC firmware log

["O'Rourke, Tom" <Tom.O'Rourke@intel.com>]

On Thu, Jul 09, 2015 at 07:29:09PM +0100, Dave Gordon wrote:
> From: Alex Dai <yu.dai@intel.com>
> 
> Allocate a GEM object to hold GuC log data. A debugfs interface
> (i915_guc_log_dump) is provided to print out the log content.
> 
> v2:
>     Add struct members at point of use [Chris Wilson]
> 
> v4:
>     Rebased
> 
> Issue: VIZ-4884
> Signed-off-by: Alex Dai <yu.dai@intel.com>
> Signed-off-by: Dave Gordon <david.s.gordon@intel.com>

Reviewed-by: Tom O'Rourke <Tom.O'Rourke@intel.com>

> ---
>  drivers/gpu/drm/i915/i915_debugfs.c        | 29 +++++++++++++++++++
>  drivers/gpu/drm/i915/i915_guc_submission.c | 46 ++++++++++++++++++++++++++++++
>  drivers/gpu/drm/i915/intel_guc.h           |  1 +
>  3 files changed, 76 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
> index 9ff5f17..13e37d1 100644
> --- a/drivers/gpu/drm/i915/i915_debugfs.c
> +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> @@ -2397,6 +2397,34 @@ static int i915_guc_load_status_info(struct seq_file *m, void *data)
>  	return 0;
>  }
>  
> +static int i915_guc_log_dump(struct seq_file *m, void *data)
> +{
> +	struct drm_info_node *node = m->private;
> +	struct drm_device *dev = node->minor->dev;
> +	struct drm_i915_private *dev_priv = dev->dev_private;
> +	struct drm_i915_gem_object *log_obj = dev_priv->guc.log_obj;
> +	u32 *log;
> +	int i = 0, pg;
> +
> +	if (!log_obj)
> +		return 0;
> +
> +	for (pg = 0; pg < log_obj->base.size / PAGE_SIZE; pg++) {
> +		log = kmap_atomic(i915_gem_object_get_page(log_obj, pg));
> +
> +		for (i = 0; i < PAGE_SIZE / sizeof(u32); i += 4)
> +			seq_printf(m, "0x%08x 0x%08x 0x%08x 0x%08x\n",
> +				   *(log + i), *(log + i + 1),
> +				   *(log + i + 2), *(log + i + 3));
> +
> +		kunmap_atomic(log);
> +	}
> +
> +	seq_putc(m, '\n');
> +
> +	return 0;
> +}
> +
>  static int i915_edp_psr_status(struct seq_file *m, void *data)
>  {
>  	struct drm_info_node *node = m->private;
> @@ -5112,6 +5140,7 @@ static const struct drm_info_list i915_debugfs_list[] = {
>  	{"i915_gem_hws_vebox", i915_hws_info, 0, (void *)VECS},
>  	{"i915_gem_batch_pool", i915_gem_batch_pool_info, 0},
>  	{"i915_guc_load_status", i915_guc_load_status_info, 0},
> +	{"i915_guc_log_dump", i915_guc_log_dump, 0},
>  	{"i915_frequency_info", i915_frequency_info, 0},
>  	{"i915_hangcheck_info", i915_hangcheck_info, 0},
>  	{"i915_drpc_info", i915_drpc_info, 0},
> diff --git a/drivers/gpu/drm/i915/i915_guc_submission.c b/drivers/gpu/drm/i915/i915_guc_submission.c
> index 70a0405..e9d46d6 100644
> --- a/drivers/gpu/drm/i915/i915_guc_submission.c
> +++ b/drivers/gpu/drm/i915/i915_guc_submission.c
> @@ -75,6 +75,47 @@ static void gem_release_guc_obj(struct drm_i915_gem_object *obj)
>  	drm_gem_object_unreference(&obj->base);
>  }
>  
> +static void guc_create_log(struct intel_guc *guc)
> +{
> +	struct drm_i915_private *dev_priv = guc_to_i915(guc);
> +	struct drm_i915_gem_object *obj;
> +	unsigned long offset;
> +	uint32_t size, flags;
> +
> +	if (i915.guc_log_level < GUC_LOG_VERBOSITY_MIN)
> +		return;
> +
> +	if (i915.guc_log_level > GUC_LOG_VERBOSITY_MAX)
> +		i915.guc_log_level = GUC_LOG_VERBOSITY_MAX;
> +
> +	/* The first page is to save log buffer state. Allocate one
> +	 * extra page for others in case for overlap */
> +	size = (1 + GUC_LOG_DPC_PAGES + 1 +
> +		GUC_LOG_ISR_PAGES + 1 +
> +		GUC_LOG_CRASH_PAGES + 1) << PAGE_SHIFT;
> +
> +	obj = guc->log_obj;
> +	if (!obj) {
> +		obj = gem_allocate_guc_obj(dev_priv->dev, size);
> +		if (!obj) {
> +			/* logging will be off */
> +			i915.guc_log_level = -1;
> +			return;
> +		}
> +
> +		guc->log_obj = obj;
> +	}
> +
> +	/* each allocated unit is a page */
> +	flags = GUC_LOG_VALID | GUC_LOG_NOTIFY_ON_HALF_FULL |
> +		(GUC_LOG_DPC_PAGES << GUC_LOG_DPC_SHIFT) |
> +		(GUC_LOG_ISR_PAGES << GUC_LOG_ISR_SHIFT) |
> +		(GUC_LOG_CRASH_PAGES << GUC_LOG_CRASH_SHIFT);
[TOR:] How does the "log half full" interrupt get handled?

> +
> +	offset = i915_gem_obj_ggtt_offset(obj) >> PAGE_SHIFT; /* in pages */
> +	guc->log_flags = (offset << GUC_LOG_BUF_ADDR_SHIFT) | flags;
> +}
> +
>  /*
>   * Set up the memory resources to be shared with the GuC.  At this point,
>   * we require just one object that can be mapped through the GGTT.
> @@ -99,6 +140,8 @@ int i915_guc_submission_init(struct drm_device *dev)
>  
>  	ida_init(&guc->ctx_ids);
>  
> +	guc_create_log(guc);
> +
>  	return 0;
>  }
>  
> @@ -107,6 +150,9 @@ void i915_guc_submission_fini(struct drm_device *dev)
>  	struct drm_i915_private *dev_priv = dev->dev_private;
>  	struct intel_guc *guc = &dev_priv->guc;
>  
> +	gem_release_guc_obj(dev_priv->guc.log_obj);
> +	guc->log_obj = NULL;
> +
>  	if (guc->ctx_pool_obj)
>  		ida_destroy(&guc->ctx_ids);
>  	gem_release_guc_obj(guc->ctx_pool_obj);
> diff --git a/drivers/gpu/drm/i915/intel_guc.h b/drivers/gpu/drm/i915/intel_guc.h
> index be3cad8..5b51b05 100644
> --- a/drivers/gpu/drm/i915/intel_guc.h
> +++ b/drivers/gpu/drm/i915/intel_guc.h
> @@ -56,6 +56,7 @@ struct intel_guc {
>  	struct intel_guc_fw guc_fw;
>  
>  	uint32_t log_flags;
> +	struct drm_i915_gem_object *log_obj;
>  
>  	struct drm_i915_gem_object *ctx_pool_obj;
>  	struct ida ctx_ids;
> -- 
> 1.9.1
> 
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