[RFC PATCH 4/9] drm/i915/gt: Expose the number of total CCS slices

[Andi Shyti <andi.shyti@xxxxxxxxxxxxxxx>]

Implement a sysfs interface to show the number of available CCS
slices. The displayed number does not take into account the CCS
balancing mode.

Signed-off-by: Andi Shyti <andi.shyti@xxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/i915/gt/intel_gt_ccs_mode.c | 23 +++++++++++++++++++++
 drivers/gpu/drm/i915/gt/intel_gt_ccs_mode.h |  1 +
 drivers/gpu/drm/i915/gt/intel_gt_sysfs.c    |  2 ++
 3 files changed, 26 insertions(+)

diff --git a/drivers/gpu/drm/i915/gt/intel_gt_ccs_mode.c b/drivers/gpu/drm/i915/gt/intel_gt_ccs_mode.c
index 06d9d1a94317..0710e55d37d7 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_ccs_mode.c
+++ b/drivers/gpu/drm/i915/gt/intel_gt_ccs_mode.c
@@ -8,6 +8,7 @@
 #include "intel_gt_ccs_mode.h"
 #include "intel_gt_print.h"
 #include "intel_gt_regs.h"
+#include "intel_gt_sysfs.h"
 
 void intel_gt_ccs_mode_init(struct intel_gt *gt)
 {
@@ -83,3 +84,25 @@ unsigned int intel_gt_apply_ccs_mode(struct intel_gt *gt)
 
 	return mode;
 }
+
+static ssize_t num_cslices_show(struct device *dev,
+				struct device_attribute *attr,
+				char *buff)
+{
+	struct intel_gt *gt = kobj_to_gt(&dev->kobj);
+	u32 num_slices;
+
+	num_slices = hweight32(gt->ccs.cslice_mask);
+
+	return sysfs_emit(buff, "%u\n", num_slices);
+}
+static DEVICE_ATTR_RO(num_cslices);
+
+void intel_gt_sysfs_ccs_init(struct intel_gt *gt)
+{
+	int err;
+
+	err = sysfs_create_file(&gt->sysfs_gt, &dev_attr_num_cslices.attr);
+	if (err)
+		gt_dbg(gt, "failed to create sysfs num_cslices files\n");
+}
diff --git a/drivers/gpu/drm/i915/gt/intel_gt_ccs_mode.h b/drivers/gpu/drm/i915/gt/intel_gt_ccs_mode.h
index a8b513c43a4f..b9ce29055857 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_ccs_mode.h
+++ b/drivers/gpu/drm/i915/gt/intel_gt_ccs_mode.h
@@ -9,6 +9,7 @@
 struct intel_gt;
 
 unsigned int intel_gt_apply_ccs_mode(struct intel_gt *gt);
+void intel_gt_sysfs_ccs_init(struct intel_gt *gt);
 void intel_gt_ccs_mode_init(struct intel_gt *gt);
 
 #endif /* __INTEL_GT_CCS_MODE_H__ */
diff --git a/drivers/gpu/drm/i915/gt/intel_gt_sysfs.c b/drivers/gpu/drm/i915/gt/intel_gt_sysfs.c
index 33cba406b569..895eedc402ae 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_sysfs.c
+++ b/drivers/gpu/drm/i915/gt/intel_gt_sysfs.c
@@ -12,6 +12,7 @@
 #include "i915_drv.h"
 #include "i915_sysfs.h"
 #include "intel_gt.h"
+#include "intel_gt_ccs_mode.h"
 #include "intel_gt_print.h"
 #include "intel_gt_sysfs.h"
 #include "intel_gt_sysfs_pm.h"
@@ -101,6 +102,7 @@ void intel_gt_sysfs_register(struct intel_gt *gt)
 		goto exit_fail;
 
 	intel_gt_sysfs_pm_init(gt, &gt->sysfs_gt);
+	intel_gt_sysfs_ccs_init(gt);
 
 	return;
 
-- 
2.45.2