[PATCH v10 3/6] drm/i915/debugfs: add rcs topology entry

[Lionel Landwerlin <lionel.g.landwerlin@intel.com>]

While the end goal is to make this information available to userspace
through a new ioctl, there is no reason we can't display it in a human
readable fashion through debugfs.

slice0: 3 subslice(s) (0x7):
	subslice0: 8 EUs (0xff)
	subslice1: 8 EUs (0xff)
	subslice2: 8 EUs (0xff)
	subslice3: 0 EUs (0x0)
slice1: 3 subslice(s) (0x7):
	subslice0: 8 EUs (0xff)
	subslice1: 8 EUs (0xff)
	subslice2: 8 EUs (0xff)
	subslice3: 0 EUs (0x0)
slice2: 3 subslice(s) (0x7):
	subslice0: 8 EUs (0xff)
	subslice1: 8 EUs (0xff)
	subslice2: 8 EUs (0xff)
	subslice3: 0 EUs (0x0)

v2: Reformat debugfs printing (Tvrtko)
    Use the new EU mask helper (Tvrtko)

v3: Move printing code to intel_device_info.c to be shared with error
    state (Michal)

Suggested-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
---
 drivers/gpu/drm/i915/i915_debugfs.c      | 11 +++++++++++
 drivers/gpu/drm/i915/intel_device_info.c | 25 +++++++++++++++++++++++++
 drivers/gpu/drm/i915/intel_device_info.h |  2 ++
 3 files changed, 38 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index e41a19b7d7bb..c3a44a54a0ba 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -3166,6 +3166,16 @@ static int i915_engine_info(struct seq_file *m, void *unused)
 	return 0;
 }
 
+static int i915_rcs_topology(struct seq_file *m, void *unused)
+{
+	struct drm_i915_private *dev_priv = node_to_i915(m->private);
+	struct drm_printer p = drm_seq_file_printer(m);
+
+	intel_device_info_dump_topology(&INTEL_INFO(dev_priv)->sseu, &p);
+
+	return 0;
+}
+
 static int i915_shrinker_info(struct seq_file *m, void *unused)
 {
 	struct drm_i915_private *i915 = node_to_i915(m->private);
@@ -4696,6 +4706,7 @@ static const struct drm_info_list i915_debugfs_list[] = {
 	{"i915_dmc_info", i915_dmc_info, 0},
 	{"i915_display_info", i915_display_info, 0},
 	{"i915_engine_info", i915_engine_info, 0},
+	{"i915_rcs_topology", i915_rcs_topology, 0},
 	{"i915_shrinker_info", i915_shrinker_info, 0},
 	{"i915_shared_dplls_info", i915_shared_dplls_info, 0},
 	{"i915_dp_mst_info", i915_dp_mst_info, 0},
diff --git a/drivers/gpu/drm/i915/intel_device_info.c b/drivers/gpu/drm/i915/intel_device_info.c
index ed14994527fc..bc08a5ef0ba2 100644
--- a/drivers/gpu/drm/i915/intel_device_info.c
+++ b/drivers/gpu/drm/i915/intel_device_info.c
@@ -123,6 +123,31 @@ void intel_device_info_dump(const struct intel_device_info *info,
 	intel_device_info_dump_flags(info, p);
 }
 
+void intel_device_info_dump_topology(const struct sseu_dev_info *sseu,
+				     struct drm_printer *p)
+{
+	int s, ss;
+
+	if (sseu->max_slices == 0) {
+		drm_printf(p, "Unavailable\n");
+		return;
+	}
+
+	for (s = 0; s < sseu->max_slices; s++) {
+		drm_printf(p, "slice%d: %u subslice(s) (0x%hhx):\n",
+			   s, hweight8(sseu->subslice_mask[s]),
+			   sseu->subslice_mask[s]);
+
+		for (ss = 0; ss < sseu->max_subslices; ss++) {
+			u8 enabled_eus = sseu_get_eus(sseu, s, ss);
+
+			drm_printf(p, "\tsubslice%d: %u EUs (0x%hhx)\n",
+				   ss, hweight8(enabled_eus), enabled_eus);
+		}
+	}
+}
+
+
 static u16 compute_eu_total(const struct sseu_dev_info *sseu)
 {
 	u16 i, total = 0;
diff --git a/drivers/gpu/drm/i915/intel_device_info.h b/drivers/gpu/drm/i915/intel_device_info.h
index 36e0df87862d..701888162944 100644
--- a/drivers/gpu/drm/i915/intel_device_info.h
+++ b/drivers/gpu/drm/i915/intel_device_info.h
@@ -220,5 +220,7 @@ void intel_device_info_dump_flags(const struct intel_device_info *info,
 				  struct drm_printer *p);
 void intel_device_info_dump_runtime(const struct intel_device_info *info,
 				    struct drm_printer *p);
+void intel_device_info_dump_topology(const struct sseu_dev_info *sseu,
+				     struct drm_printer *p);
 
 #endif
-- 
2.15.1

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