Re: [PATCH 1/3] drm/i915: Report steering details in debugfs

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On Mon, 2022-03-14 at 16:42 -0700, Matt Roper wrote:
> Add a new 'steering' node in each gt's debugfs directory that tells
> whether we're using explicit steering for various types of MCR ranges
> and, if so, what MMIO ranges it applies to.
> 
> We're going to be transitioning away from implicit steering, even for
> slice/dss steering soon, so the information reported here will become
> increasingly valuable once that happens.
> 
> Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@xxxxxxxxx>
> Signed-off-by: Matt Roper <matthew.d.roper@xxxxxxxxx>
> ---
>  drivers/gpu/drm/i915/gt/intel_gt.c          | 46 +++++++++++++++++++++
>  drivers/gpu/drm/i915/gt/intel_gt.h          |  2 +
>  drivers/gpu/drm/i915/gt/intel_gt_debugfs.c  | 13 ++++++
>  drivers/gpu/drm/i915/gt/intel_gt_types.h    |  5 +++
>  drivers/gpu/drm/i915/gt/intel_workarounds.c |  8 +++-
>  5 files changed, 73 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/gt/intel_gt.c b/drivers/gpu/drm/i915/gt/intel_gt.c
> index 8a2483ccbfb9..041add4019fc 100644
> --- a/drivers/gpu/drm/i915/gt/intel_gt.c
> +++ b/drivers/gpu/drm/i915/gt/intel_gt.c
> @@ -96,6 +96,12 @@ int intel_gt_assign_ggtt(struct intel_gt *gt)
>  	return gt->ggtt ? 0 : -ENOMEM;
>  }
>  
> +const char *intel_steering_types[] = {

missing static as kernel test bot reported.
with that fixed: Reviewed-by: José Roberto de Souza <jose.souza@xxxxxxxxx>

> +	"L3BANK",
> +	"MSLICE",
> +	"LNCF",
> +};
> +
>  static const struct intel_mmio_range icl_l3bank_steering_table[] = {
>  	{ 0x00B100, 0x00B3FF },
>  	{},
> @@ -932,6 +938,46 @@ u32 intel_gt_read_register(struct intel_gt *gt, i915_reg_t reg)
>  	return intel_uncore_read(gt->uncore, reg);
>  }
>  
> +static void report_steering_type(struct drm_printer *p,
> +				 struct intel_gt *gt,
> +				 enum intel_steering_type type,
> +				 bool dump_table)
> +{
> +	const struct intel_mmio_range *entry;
> +	u8 slice, subslice;
> +
> +	BUILD_BUG_ON(ARRAY_SIZE(intel_steering_types) != NUM_STEERING_TYPES);
> +
> +	if (!gt->steering_table[type]) {
> +		drm_printf(p, "%s steering: uses default steering\n",
> +			   intel_steering_types[type]);
> +		return;
> +	}
> +
> +	intel_gt_get_valid_steering(gt, type, &slice, &subslice);
> +	drm_printf(p, "%s steering: sliceid=0x%x, subsliceid=0x%x\n",
> +		   intel_steering_types[type], slice, subslice);
> +
> +	if (!dump_table)
> +		return;
> +
> +	for (entry = gt->steering_table[type]; entry->end; entry++)
> +		drm_printf(p, "\t0x%06x - 0x%06x\n", entry->start, entry->end);
> +}
> +
> +void intel_gt_report_steering(struct drm_printer *p, struct intel_gt *gt,
> +			      bool dump_table)
> +{
> +	drm_printf(p, "Default steering: sliceid=0x%x, subsliceid=0x%x\n",
> +		   gt->default_steering.groupid,
> +		   gt->default_steering.instanceid);
> +
> +	if (HAS_MSLICES(gt->i915)) {
> +		report_steering_type(p, gt, MSLICE, dump_table);
> +		report_steering_type(p, gt, LNCF, dump_table);
> +	}
> +}
> +
>  void intel_gt_info_print(const struct intel_gt_info *info,
>  			 struct drm_printer *p)
>  {
> diff --git a/drivers/gpu/drm/i915/gt/intel_gt.h b/drivers/gpu/drm/i915/gt/intel_gt.h
> index 0f571c8ee22b..3edece1865e4 100644
> --- a/drivers/gpu/drm/i915/gt/intel_gt.h
> +++ b/drivers/gpu/drm/i915/gt/intel_gt.h
> @@ -87,6 +87,8 @@ static inline bool intel_gt_needs_read_steering(struct intel_gt *gt,
>  u32 intel_gt_read_register_fw(struct intel_gt *gt, i915_reg_t reg);
>  u32 intel_gt_read_register(struct intel_gt *gt, i915_reg_t reg);
>  
> +void intel_gt_report_steering(struct drm_printer *p, struct intel_gt *gt,
> +			      bool dump_table);
>  void intel_gt_info_print(const struct intel_gt_info *info,
>  			 struct drm_printer *p);
>  
> diff --git a/drivers/gpu/drm/i915/gt/intel_gt_debugfs.c b/drivers/gpu/drm/i915/gt/intel_gt_debugfs.c
> index f103664b71d4..6f45b131a001 100644
> --- a/drivers/gpu/drm/i915/gt/intel_gt_debugfs.c
> +++ b/drivers/gpu/drm/i915/gt/intel_gt_debugfs.c
> @@ -6,6 +6,7 @@
>  #include <linux/debugfs.h>
>  
>  #include "i915_drv.h"
> +#include "intel_gt.h"
>  #include "intel_gt_debugfs.h"
>  #include "intel_gt_engines_debugfs.h"
>  #include "intel_gt_pm_debugfs.h"
> @@ -57,10 +58,22 @@ static int __intel_gt_debugfs_reset_store(void *data, u64 val)
>  DEFINE_SIMPLE_ATTRIBUTE(reset_fops, __intel_gt_debugfs_reset_show,
>  			__intel_gt_debugfs_reset_store, "%llu\n");
>  
> +static int steering_show(struct seq_file *m, void *data)
> +{
> +	struct drm_printer p = drm_seq_file_printer(m);
> +	struct intel_gt *gt = m->private;
> +
> +	intel_gt_report_steering(&p, gt, true);
> +
> +	return 0;
> +}
> +DEFINE_INTEL_GT_DEBUGFS_ATTRIBUTE(steering);
> +
>  static void gt_debugfs_register(struct intel_gt *gt, struct dentry *root)
>  {
>  	static const struct intel_gt_debugfs_file files[] = {
>  		{ "reset", &reset_fops, NULL },
> +		{ "steering", &steering_fops },
>  	};
>  
>  	intel_gt_debugfs_register_files(root, files, ARRAY_SIZE(files), gt);
> diff --git a/drivers/gpu/drm/i915/gt/intel_gt_types.h b/drivers/gpu/drm/i915/gt/intel_gt_types.h
> index f20687796490..7781ab84e7a3 100644
> --- a/drivers/gpu/drm/i915/gt/intel_gt_types.h
> +++ b/drivers/gpu/drm/i915/gt/intel_gt_types.h
> @@ -182,6 +182,11 @@ struct intel_gt {
>  
>  	const struct intel_mmio_range *steering_table[NUM_STEERING_TYPES];
>  
> +	struct {
> +		u8 groupid;
> +		u8 instanceid;
> +	} default_steering;
> +
>  	struct intel_gt_info {
>  		intel_engine_mask_t engine_mask;
>  
> diff --git a/drivers/gpu/drm/i915/gt/intel_workarounds.c b/drivers/gpu/drm/i915/gt/intel_workarounds.c
> index beca8735bae5..c328d46f8095 100644
> --- a/drivers/gpu/drm/i915/gt/intel_workarounds.c
> +++ b/drivers/gpu/drm/i915/gt/intel_workarounds.c
> @@ -1072,9 +1072,15 @@ static void __set_mcr_steering(struct i915_wa_list *wal,
>  static void __add_mcr_wa(struct intel_gt *gt, struct i915_wa_list *wal,
>  			 unsigned int slice, unsigned int subslice)
>  {
> -	drm_dbg(&gt->i915->drm, "MCR slice=0x%x, subslice=0x%x\n", slice, subslice);
> +	struct drm_printer p = drm_debug_printer("MCR Steering:");
>  
>  	__set_mcr_steering(wal, GEN8_MCR_SELECTOR, slice, subslice);
> +
> +	gt->default_steering.groupid = slice;
> +	gt->default_steering.instanceid = subslice;
> +
> +	if (drm_debug_enabled(DRM_UT_DRIVER))
> +		intel_gt_report_steering(&p, gt, false);
>  }
>  
>  static void





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