linux-kernel - [PATCH] drm/radeon/cik: Clean up doorbells

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Message-ID: <20250514011610.136607-1-linux@treblig.org>
Date: Wed, 14 May 2025 02:16:10 +0100
From: linux@...blig.org
To: alexander.deucher@....com,
	christophe.jaillet@...adoo.fr,
	christian.koenig@....com
Cc: airlied@...il.com,
	simona@...ll.ch,
	amd-gfx@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	"Dr. David Alan Gilbert" <linux@...blig.org>
Subject: [PATCH] drm/radeon/cik: Clean up doorbells

From: "Dr. David Alan Gilbert" <linux@...blig.org>

Free doorbells in the error paths of cik_init and in cik_fini.

Build tested only.

Suggested-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
Signed-off-by: Dr. David Alan Gilbert <linux@...blig.org>
---
RFC->v1
  Renamed ringCP[12]->ring_cp[12]
  Cleaned up doorbells in cik_startup failure case

 drivers/gpu/drm/radeon/cik.c | 42 +++++++++++++++++++++++++-----------
 1 file changed, 30 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/radeon/cik.c b/drivers/gpu/drm/radeon/cik.c
index 11a492f21157..51a3e0fc2f56 100644
--- a/drivers/gpu/drm/radeon/cik.c
+++ b/drivers/gpu/drm/radeon/cik.c
@@ -8548,7 +8548,7 @@ int cik_suspend(struct radeon_device *rdev)
  */
 int cik_init(struct radeon_device *rdev)
 {
-	struct radeon_ring *ring;
+	struct radeon_ring *ring, *ring_cp1, *ring_cp2;
 	int r;
 
 	/* Read BIOS */
@@ -8623,19 +8623,22 @@ int cik_init(struct radeon_device *rdev)
 	ring->ring_obj = NULL;
 	r600_ring_init(rdev, ring, 1024 * 1024);
 
-	ring = &rdev->ring[CAYMAN_RING_TYPE_CP1_INDEX];
-	ring->ring_obj = NULL;
-	r600_ring_init(rdev, ring, 1024 * 1024);
-	r = radeon_doorbell_get(rdev, &ring->doorbell_index);
+	ring_cp1 = &rdev->ring[CAYMAN_RING_TYPE_CP1_INDEX];
+	ring_cp2 = &rdev->ring[CAYMAN_RING_TYPE_CP2_INDEX];
+	ring_cp1->ring_obj = NULL;
+	ring_cp2->ring_obj = NULL;
+	ring_cp1->doorbell_index = RADEON_MAX_DOORBELLS;
+	ring_cp2->doorbell_index = RADEON_MAX_DOORBELLS;
+
+	r600_ring_init(rdev, ring_cp1, 1024 * 1024);
+	r = radeon_doorbell_get(rdev, &ring_cp1->doorbell_index);
 	if (r)
 		return r;
 
-	ring = &rdev->ring[CAYMAN_RING_TYPE_CP2_INDEX];
-	ring->ring_obj = NULL;
-	r600_ring_init(rdev, ring, 1024 * 1024);
-	r = radeon_doorbell_get(rdev, &ring->doorbell_index);
+	r600_ring_init(rdev, ring_cp2, 1024 * 1024);
+	r = radeon_doorbell_get(rdev, &ring_cp2->doorbell_index);
 	if (r)
-		return r;
+		goto out;
 
 	ring = &rdev->ring[R600_RING_TYPE_DMA_INDEX];
 	ring->ring_obj = NULL;
@@ -8653,12 +8656,16 @@ int cik_init(struct radeon_device *rdev)
 
 	r = r600_pcie_gart_init(rdev);
 	if (r)
-		return r;
+		goto out;
 
 	rdev->accel_working = true;
 	r = cik_startup(rdev);
 	if (r) {
 		dev_err(rdev->dev, "disabling GPU acceleration\n");
+		radeon_doorbell_free(rdev, ring_cp1->doorbell_index);
+		radeon_doorbell_free(rdev, ring_cp2->doorbell_index);
+		ring_cp1->doorbell_index = RADEON_MAX_DOORBELLS;
+		ring_cp2->doorbell_index = RADEON_MAX_DOORBELLS;
 		cik_cp_fini(rdev);
 		cik_sdma_fini(rdev);
 		cik_irq_fini(rdev);
@@ -8678,10 +8685,16 @@ int cik_init(struct radeon_device *rdev)
 	 */
 	if (!rdev->mc_fw && !(rdev->flags & RADEON_IS_IGP)) {
 		DRM_ERROR("radeon: MC ucode required for NI+.\n");
-		return -EINVAL;
+		r = -EINVAL;
+		goto out;
 	}
 
 	return 0;
+
+out:
+	radeon_doorbell_free(rdev, ring_cp1->doorbell_index);
+	radeon_doorbell_free(rdev, ring_cp2->doorbell_index);
+	return r;
 }
 
 /**
@@ -8695,6 +8708,7 @@ int cik_init(struct radeon_device *rdev)
  */
 void cik_fini(struct radeon_device *rdev)
 {
+	struct radeon_ring *ring;
 	radeon_pm_fini(rdev);
 	cik_cp_fini(rdev);
 	cik_sdma_fini(rdev);
@@ -8708,6 +8722,10 @@ void cik_fini(struct radeon_device *rdev)
 	radeon_ib_pool_fini(rdev);
 	radeon_irq_kms_fini(rdev);
 	uvd_v1_0_fini(rdev);
+	ring = &rdev->ring[CAYMAN_RING_TYPE_CP1_INDEX];
+	radeon_doorbell_free(rdev, ring->doorbell_index);
+	ring = &rdev->ring[CAYMAN_RING_TYPE_CP2_INDEX];
+	radeon_doorbell_free(rdev, ring->doorbell_index);
 	radeon_uvd_fini(rdev);
 	radeon_vce_fini(rdev);
 	cik_pcie_gart_fini(rdev);
-- 
2.49.0