[PATCH 08/11] drm/i915/gt: Store active CCS mask

[Andi Shyti]

To support upcoming patches, we need to store the current mask
for active CCS engines.

Active engines refer to those exposed to userspace via the UABI
engine list.

Signed-off-by: Andi Shyti <andi.shyti at linux.intel.com>
---
 drivers/gpu/drm/i915/gt/intel_gt_ccs_mode.c | 29 ++++++++++++++++++---
 drivers/gpu/drm/i915/gt/intel_gt_types.h    |  1 +
 2 files changed, 26 insertions(+), 4 deletions(-)

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 085af56b3afb..41695221cdaf 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_ccs_mode.c
+++ b/drivers/gpu/drm/i915/gt/intel_gt_ccs_mode.c
@@ -12,10 +12,10 @@
 static void intel_gt_apply_ccs_mode(struct intel_gt *gt)
 {
 	unsigned long cslices_mask = CCS_MASK(gt);
+	u32 m = hweight32(gt->ccs.ccs_mask);
 	u32 mode_val = 0;
 	int ccs_id;
 	int cslice;
-	u32 m = 1;
 
 	lockdep_assert_held(&gt->ccs.mutex);
 
@@ -76,7 +76,8 @@ static void intel_gt_apply_ccs_mode(struct intel_gt *gt)
 		mode_val |= XEHP_CCS_MODE_CSLICE(cslice, ccs_id);
 
 		if (!m) {
-			m = 1; /* CCS mode, will be used later to reset to a flexible value */
+			/* CCS mode, reset to the initial mode */
+			m = hweight32(gt->ccs.ccs_mask);
 			ccs_id = __ffs(cslices_mask);
 			continue;
 		}
@@ -88,14 +89,34 @@ static void intel_gt_apply_ccs_mode(struct intel_gt *gt)
 	gt->ccs.mode_reg_val = mode_val;
 }
 
-void intel_gt_ccs_mode_init(struct intel_gt *gt)
+static void update_ccs_mask(struct intel_gt *gt, u32 ccs_mode)
 {
-	mutex_init(&gt->ccs.mutex);
+	unsigned long cslices_mask = CCS_MASK(gt);
+	int i;
+
+	/* Mask off all the CCS engines */
+	gt->ccs.ccs_mask = 0;
+
+	for_each_set_bit(i, &cslices_mask, I915_MAX_CCS) {
+		gt->ccs.ccs_mask |= BIT(i);
+
+		ccs_mode--;
+		if (!ccs_mode)
+			break;
+	}
 
 	/* Initialize the CCS mode setting */
 	intel_gt_apply_ccs_mode(gt);
 }
 
+void intel_gt_ccs_mode_init(struct intel_gt *gt)
+{
+	mutex_init(&gt->ccs.mutex);
+
+	/* Set CCS balance mode 1 in the ccs_mask */
+	update_ccs_mask(gt, 1);
+}
+
 static ssize_t num_cslices_show(struct device *dev,
 				struct device_attribute *attr,
 				char *buff)
diff --git a/drivers/gpu/drm/i915/gt/intel_gt_types.h b/drivers/gpu/drm/i915/gt/intel_gt_types.h
index a833b395237b..235b4b81eecd 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_types.h
+++ b/drivers/gpu/drm/i915/gt/intel_gt_types.h
@@ -220,6 +220,7 @@ struct intel_gt {
 	struct {
 		struct mutex mutex;
 		u32 mode_reg_val;
+		intel_engine_mask_t ccs_mask;
 	} ccs;
 
 	/*
-- 
2.45.2