[PATCH 08/11] drm/amdgpu/gfx12: add support for disable_kq

[Alex Deucher]

Plumb in support for disabling kernel queues.

v2: use ring counts per Felix' suggestion

Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/gfx_v12_0.c | 96 ++++++++++++++++----------
 1 file changed, 58 insertions(+), 38 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v12_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v12_0.c
index 34cf187e72d9f..23ee4651cbffb 100644
--- a/drivers/gpu/drm/amd/amdgpu/gfx_v12_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v12_0.c
@@ -1421,11 +1421,13 @@ static int gfx_v12_0_sw_init(struct amdgpu_ip_block *ip_block)
 		break;
 	}
 
-	/* recalculate compute rings to use based on hardware configuration */
-	num_compute_rings = (adev->gfx.mec.num_pipe_per_mec *
-			     adev->gfx.mec.num_queue_per_pipe) / 2;
-	adev->gfx.num_compute_rings = min(adev->gfx.num_compute_rings,
-					  num_compute_rings);
+	if (adev->gfx.num_compute_rings) {
+		/* recalculate compute rings to use based on hardware configuration */
+		num_compute_rings = (adev->gfx.mec.num_pipe_per_mec *
+				     adev->gfx.mec.num_queue_per_pipe) / 2;
+		adev->gfx.num_compute_rings = min(adev->gfx.num_compute_rings,
+						  num_compute_rings);
+	}
 
 	/* EOP Event */
 	r = amdgpu_irq_add_id(adev, SOC21_IH_CLIENTID_GRBM_CP,
@@ -1471,37 +1473,41 @@ static int gfx_v12_0_sw_init(struct amdgpu_ip_block *ip_block)
 		return r;
 	}
 
-	/* set up the gfx ring */
-	for (i = 0; i < adev->gfx.me.num_me; i++) {
-		for (j = 0; j < adev->gfx.me.num_queue_per_pipe; j++) {
-			for (k = 0; k < adev->gfx.me.num_pipe_per_me; k++) {
-				if (!amdgpu_gfx_is_me_queue_enabled(adev, i, k, j))
-					continue;
-
-				r = gfx_v12_0_gfx_ring_init(adev, ring_id,
-							    i, k, j);
-				if (r)
-					return r;
-				ring_id++;
+	if (adev->gfx.num_gfx_rings) {
+		/* set up the gfx ring */
+		for (i = 0; i < adev->gfx.me.num_me; i++) {
+			for (j = 0; j < adev->gfx.me.num_queue_per_pipe; j++) {
+				for (k = 0; k < adev->gfx.me.num_pipe_per_me; k++) {
+					if (!amdgpu_gfx_is_me_queue_enabled(adev, i, k, j))
+						continue;
+
+					r = gfx_v12_0_gfx_ring_init(adev, ring_id,
+								    i, k, j);
+					if (r)
+						return r;
+					ring_id++;
+				}
 			}
 		}
 	}
 
-	ring_id = 0;
-	/* set up the compute queues - allocate horizontally across pipes */
-	for (i = 0; i < adev->gfx.mec.num_mec; ++i) {
-		for (j = 0; j < adev->gfx.mec.num_queue_per_pipe; j++) {
-			for (k = 0; k < adev->gfx.mec.num_pipe_per_mec; k++) {
-				if (!amdgpu_gfx_is_mec_queue_enabled(adev,
-								0, i, k, j))
-					continue;
+	if (adev->gfx.num_compute_rings) {
+		ring_id = 0;
+		/* set up the compute queues - allocate horizontally across pipes */
+		for (i = 0; i < adev->gfx.mec.num_mec; ++i) {
+			for (j = 0; j < adev->gfx.mec.num_queue_per_pipe; j++) {
+				for (k = 0; k < adev->gfx.mec.num_pipe_per_mec; k++) {
+					if (!amdgpu_gfx_is_mec_queue_enabled(adev,
+									     0, i, k, j))
+						continue;
 
-				r = gfx_v12_0_compute_ring_init(adev, ring_id,
-								i, k, j);
-				if (r)
-					return r;
+					r = gfx_v12_0_compute_ring_init(adev, ring_id,
+									i, k, j);
+					if (r)
+						return r;
 
-				ring_id++;
+					ring_id++;
+				}
 			}
 		}
 	}
@@ -3495,12 +3501,18 @@ static int gfx_v12_0_cp_resume(struct amdgpu_device *adev)
 	if (r)
 		return r;
 
-	if (!amdgpu_async_gfx_ring) {
-		r = gfx_v12_0_cp_gfx_resume(adev);
-		if (r)
-			return r;
+	if (adev->gfx.num_gfx_rings) {
+		if (!amdgpu_async_gfx_ring) {
+			r = gfx_v12_0_cp_gfx_resume(adev);
+			if (r)
+				return r;
+		} else {
+			r = gfx_v12_0_cp_async_gfx_ring_resume(adev);
+			if (r)
+				return r;
+		}
 	} else {
-		r = gfx_v12_0_cp_async_gfx_ring_resume(adev);
+		r = gfx_v12_0_cp_gfx_start(adev);
 		if (r)
 			return r;
 	}
@@ -3809,11 +3821,19 @@ static int gfx_v12_0_early_init(struct amdgpu_ip_block *ip_block)
 {
 	struct amdgpu_device *adev = ip_block->adev;
 
+	if (amdgpu_disable_kq == 1)
+		adev->gfx.disable_kq = true;
+
 	adev->gfx.funcs = &gfx_v12_0_gfx_funcs;
 
-	adev->gfx.num_gfx_rings = GFX12_NUM_GFX_RINGS;
-	adev->gfx.num_compute_rings = min(amdgpu_gfx_get_num_kcq(adev),
-					  AMDGPU_MAX_COMPUTE_RINGS);
+	if (adev->gfx.disable_kq) {
+		adev->gfx.num_gfx_rings = 0;
+		adev->gfx.num_compute_rings = 0;
+	} else {
+		adev->gfx.num_gfx_rings = GFX12_NUM_GFX_RINGS;
+		adev->gfx.num_compute_rings = min(amdgpu_gfx_get_num_kcq(adev),
+						  AMDGPU_MAX_COMPUTE_RINGS);
+	}
 
 	gfx_v12_0_set_kiq_pm4_funcs(adev);
 	gfx_v12_0_set_ring_funcs(adev);
-- 
2.48.1