Re: [PATCH v3 2/7] drm/vkms: Support multiple DRM objects (crtcs, etc.) per VKMS device

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Hi Brandon,

A few nits I've found where I'm getting some kernel locking errors, when running this new series.

On 8/18/23 10:43, Brandon Pollack wrote:
From: Jim Shargo <jshargo@xxxxxxxxxxxx>

This change supports multiple CRTCs, encoders, connectors instead of one
of each per device.

Since ConfigFS-based devices will support multiple crtcs, it's useful to
move all of the writeback/composition data from being per-"output" to
being per-CRTC.

Since there's still only ever one CRTC, this should be a no-op refactor.

Signed-off-by: Jim Shargo <jshargo@xxxxxxxxxxxx>
Signed-off-by: Brandon Pollack <brpol@xxxxxxxxxxxx>
---
  drivers/gpu/drm/vkms/vkms_composer.c  |  30 +++----
  drivers/gpu/drm/vkms/vkms_crtc.c      | 101 ++++++++++++---------
  drivers/gpu/drm/vkms/vkms_drv.c       |  12 +--
  drivers/gpu/drm/vkms/vkms_drv.h       |  70 +++++++++------
  drivers/gpu/drm/vkms/vkms_output.c    | 122 ++++++++++++++++++--------
  drivers/gpu/drm/vkms/vkms_plane.c     |  38 ++++++--
  drivers/gpu/drm/vkms/vkms_writeback.c |  33 +++----
  7 files changed, 259 insertions(+), 147 deletions(-)

diff --git a/drivers/gpu/drm/vkms/vkms_composer.c b/drivers/gpu/drm/vkms/vkms_composer.c
index d5d4f642d367..a59eb75a21c4 100644
--- a/drivers/gpu/drm/vkms/vkms_composer.c
+++ b/drivers/gpu/drm/vkms/vkms_composer.c
@@ -300,13 +300,13 @@ void vkms_composer_worker(struct work_struct *work)
  						composer_work);
  	struct drm_crtc *crtc = crtc_state->base.crtc;
  	struct vkms_writeback_job *active_wb = crtc_state->active_writeback;
-	struct vkms_output *out = drm_crtc_to_vkms_output(crtc);
+	struct vkms_crtc *vkms_crtc = drm_crtc_to_vkms_crtc(crtc);
  	bool crc_pending, wb_pending;
  	u64 frame_start, frame_end;
  	u32 crc32 = 0;
  	int ret;
- spin_lock_irq(&out->composer_lock);
+	spin_lock_irq(&vkms_crtc->composer_lock);
  	frame_start = crtc_state->frame_start;
  	frame_end = crtc_state->frame_end;
  	crc_pending = crtc_state->crc_pending;
@@ -330,7 +330,7 @@ void vkms_composer_worker(struct work_struct *work)
  		crtc_state->gamma_lut.base = NULL;
  	}
- spin_unlock_irq(&out->composer_lock);
+	spin_unlock_irq(&vkms_crtc->composer_lock);
/*
  	 * We raced with the vblank hrtimer and previous work already computed
@@ -348,10 +348,10 @@ void vkms_composer_worker(struct work_struct *work)
  		return;
if (wb_pending) {
-		drm_writeback_signal_completion(&out->wb_connector, 0);
-		spin_lock_irq(&out->composer_lock);
+		drm_writeback_signal_completion(&vkms_crtc->wb_connector, 0);
+		spin_lock_irq(&vkms_crtc->composer_lock);
  		crtc_state->wb_pending = false;
-		spin_unlock_irq(&out->composer_lock);
+		spin_unlock_irq(&vkms_crtc->composer_lock);
  	}
/*
@@ -401,30 +401,30 @@ int vkms_verify_crc_source(struct drm_crtc *crtc, const char *src_name,
  	return 0;
  }
-void vkms_set_composer(struct vkms_output *out, bool enabled)
+void vkms_set_composer(struct vkms_crtc *vkms_crtc, bool enabled)
  {
  	bool old_enabled;
if (enabled)
-		drm_crtc_vblank_get(&out->crtc);
+		drm_crtc_vblank_get(&vkms_crtc->base);
- mutex_lock(&out->enabled_lock);
-	old_enabled = out->composer_enabled;
-	out->composer_enabled = enabled;
+	mutex_lock(&vkms_crtc->enabled_lock);
+	old_enabled = vkms_crtc->composer_enabled;
+	vkms_crtc->composer_enabled = enabled;
/* the composition wasn't enabled, so unlock the lock to make sure the lock
  	 * will be balanced even if we have a failed commit
  	 */
-	if (!out->composer_enabled)
-		mutex_unlock(&out->enabled_lock);
+	if (!vkms_crtc->composer_enabled)
+		mutex_unlock(&vkms_crtc->enabled_lock);
if (old_enabled)
-		drm_crtc_vblank_put(&out->crtc);
+		drm_crtc_vblank_put(&vkms_crtc->base);
  }
int vkms_set_crc_source(struct drm_crtc *crtc, const char *src_name)
  {
-	struct vkms_output *out = drm_crtc_to_vkms_output(crtc);
+	struct vkms_crtc *out = drm_crtc_to_vkms_crtc(crtc);
  	bool enabled = false;
  	int ret = 0;
diff --git a/drivers/gpu/drm/vkms/vkms_crtc.c b/drivers/gpu/drm/vkms/vkms_crtc.c
index 3c5ebf106b66..f10a5ec8111d 100644
--- a/drivers/gpu/drm/vkms/vkms_crtc.c
+++ b/drivers/gpu/drm/vkms/vkms_crtc.c
@@ -1,5 +1,6 @@
  // SPDX-License-Identifier: GPL-2.0+
+#include "linux/mutex.h"
  #include <linux/dma-fence.h>
#include <drm/drm_atomic.h>
@@ -11,27 +12,27 @@
static enum hrtimer_restart vkms_vblank_simulate(struct hrtimer *timer)
  {
-	struct vkms_output *output = container_of(timer, struct vkms_output,
-						  vblank_hrtimer);
-	struct drm_crtc *crtc = &output->crtc;
+	struct vkms_crtc *vkms_crtc = timer_to_vkms_crtc(timer);
+	struct drm_crtc *crtc = &vkms_crtc->base;
  	struct vkms_crtc_state *state;
  	u64 ret_overrun;
  	bool ret, fence_cookie, composer_enabled;
fence_cookie = dma_fence_begin_signalling(); - ret_overrun = hrtimer_forward_now(&output->vblank_hrtimer,
-					  output->period_ns);
+	ret_overrun = hrtimer_forward_now(&vkms_crtc->vblank_hrtimer,
+					  vkms_crtc->period_ns);
  	if (ret_overrun != 1)
  		pr_warn("%s: vblank timer overrun\n", __func__);
+ mutex_lock(&vkms_crtc->enabled_lock);
My impression is that vkms_set_composer() would take this lock, so you don't actually need to take here. See also commit a0e6a017ab56936c0405fe914a793b241ed25ee0.

  	ret = drm_crtc_handle_vblank(crtc);
  	if (!ret)
  		DRM_ERROR("vkms failure on handling vblank");
- state = output->composer_state;
-	composer_enabled = output->composer_enabled;
-	mutex_unlock(&output->enabled_lock);
+	state = vkms_crtc->composer_state;
+	composer_enabled = vkms_crtc->composer_enabled;
+	mutex_unlock(&vkms_crtc->enabled_lock);
if (state && composer_enabled) {
  		u64 frame = drm_crtc_accurate_vblank_count(crtc);
@@ -39,7 +40,7 @@ static enum hrtimer_restart vkms_vblank_simulate(struct hrtimer *timer)
  		/* update frame_start only if a queued vkms_composer_worker()
  		 * has read the data
  		 */
-		spin_lock(&output->composer_lock);
+		spin_lock(&vkms_crtc->composer_lock);
  		if (!state->crc_pending)
  			state->frame_start = frame;
  		else
@@ -47,9 +48,10 @@ static enum hrtimer_restart vkms_vblank_simulate(struct hrtimer *timer)
  					 state->frame_start, frame);
  		state->frame_end = frame;
  		state->crc_pending = true;
-		spin_unlock(&output->composer_lock);
+		spin_unlock(&vkms_crtc->composer_lock);
- ret = queue_work(output->composer_workq, &state->composer_work);
+		ret = queue_work(vkms_crtc->composer_workq,
+				 &state->composer_work);
  		if (!ret)
  			DRM_DEBUG_DRIVER("Composer worker already queued\n");
  	}
@@ -62,25 +64,27 @@ static enum hrtimer_restart vkms_vblank_simulate(struct hrtimer *timer)
  static int vkms_enable_vblank(struct drm_crtc *crtc)
  {
  	struct drm_device *dev = crtc->dev;
+	struct vkms_crtc *vkms_crtc = drm_crtc_to_vkms_crtc(crtc);
  	unsigned int pipe = drm_crtc_index(crtc);
  	struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
-	struct vkms_output *out = drm_crtc_to_vkms_output(crtc);
drm_calc_timestamping_constants(crtc, &crtc->mode); - hrtimer_init(&out->vblank_hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
-	out->vblank_hrtimer.function = &vkms_vblank_simulate;
-	out->period_ns = ktime_set(0, vblank->framedur_ns);
-	hrtimer_start(&out->vblank_hrtimer, out->period_ns, HRTIMER_MODE_REL);
+	hrtimer_init(&vkms_crtc->vblank_hrtimer, CLOCK_MONOTONIC,
+		     HRTIMER_MODE_REL);
+	vkms_crtc->vblank_hrtimer.function = &vkms_vblank_simulate;
+	vkms_crtc->period_ns = ktime_set(0, vblank->framedur_ns);
+	hrtimer_start(&vkms_crtc->vblank_hrtimer, vkms_crtc->period_ns,
+		      HRTIMER_MODE_REL);
return 0;
  }
static void vkms_disable_vblank(struct drm_crtc *crtc)
  {
-	struct vkms_output *out = drm_crtc_to_vkms_output(crtc);
+	struct vkms_crtc *vkms_crtc = drm_crtc_to_vkms_crtc(crtc);
- hrtimer_cancel(&out->vblank_hrtimer);
+	hrtimer_cancel(&vkms_crtc->vblank_hrtimer);
  }
static bool vkms_get_vblank_timestamp(struct drm_crtc *crtc,
@@ -88,9 +92,8 @@ static bool vkms_get_vblank_timestamp(struct drm_crtc *crtc,
  				      bool in_vblank_irq)
  {
  	struct drm_device *dev = crtc->dev;
+	struct vkms_crtc *vkms_crtc = drm_crtc_to_vkms_crtc(crtc);
  	unsigned int pipe = crtc->index;
-	struct vkms_device *vkmsdev = drm_device_to_vkms_device(dev);
-	struct vkms_output *output = &vkmsdev->output;
  	struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
if (!READ_ONCE(vblank->enabled)) {
@@ -98,7 +101,7 @@ static bool vkms_get_vblank_timestamp(struct drm_crtc *crtc,
  		return true;
  	}
- *vblank_time = READ_ONCE(output->vblank_hrtimer.node.expires);
+	*vblank_time = READ_ONCE(vkms_crtc->vblank_hrtimer.node.expires);
if (WARN_ON(*vblank_time == vblank->time))
  		return true;
@@ -110,7 +113,7 @@ static bool vkms_get_vblank_timestamp(struct drm_crtc *crtc,
  	 * the vblank core expects. Therefore we need to always correct the
  	 * timestampe by one frame.
  	 */
-	*vblank_time -= output->period_ns;
+	*vblank_time -= vkms_crtc->period_ns;
return true;
  }
@@ -236,18 +239,18 @@ static void vkms_crtc_atomic_disable(struct drm_crtc *crtc,
  static void vkms_crtc_atomic_begin(struct drm_crtc *crtc,
  				   struct drm_atomic_state *state)
  {
-	struct vkms_output *vkms_output = drm_crtc_to_vkms_output(crtc);
+	struct vkms_crtc *vkms_crtc = drm_crtc_to_vkms_crtc(crtc);
/* This lock is held across the atomic commit to block vblank timer
  	 * from scheduling vkms_composer_worker until the composer is updated
  	 */
-	spin_lock_irq(&vkms_output->lock);
+	spin_lock_irq(&vkms_crtc->lock);
  }
static void vkms_crtc_atomic_flush(struct drm_crtc *crtc,
  				   struct drm_atomic_state *state)
  {
-	struct vkms_output *vkms_output = drm_crtc_to_vkms_output(crtc);
+	struct vkms_crtc *vkms_crtc = drm_crtc_to_vkms_crtc(crtc);
if (crtc->state->event) {
  		spin_lock(&crtc->dev->event_lock);
@@ -262,9 +265,9 @@ static void vkms_crtc_atomic_flush(struct drm_crtc *crtc,
  		crtc->state->event = NULL;
  	}
- vkms_output->composer_state = to_vkms_crtc_state(crtc->state);
+	vkms_crtc->composer_state = to_vkms_crtc_state(crtc->state);
- spin_unlock_irq(&vkms_output->lock);
+	spin_unlock_irq(&vkms_crtc->lock);
  }
static const struct drm_crtc_helper_funcs vkms_crtc_helper_funcs = {
@@ -275,31 +278,45 @@ static const struct drm_crtc_helper_funcs vkms_crtc_helper_funcs = {
  	.atomic_disable	= vkms_crtc_atomic_disable,
  };
-int vkms_crtc_init(struct drm_device *dev, struct drm_crtc *crtc,
-		   struct drm_plane *primary, struct drm_plane *cursor)
+struct vkms_crtc *vkms_crtc_init(struct vkms_device *vkmsdev,
+				 struct drm_plane *primary,
+				 struct drm_plane *cursor)
  {
-	struct vkms_output *vkms_out = drm_crtc_to_vkms_output(crtc);
+	struct drm_device *dev = &vkmsdev->drm;
+	struct vkms_crtc *vkms_crtc;
  	int ret;
- ret = drmm_crtc_init_with_planes(dev, crtc, primary, cursor,
+	if (vkmsdev->output.num_crtcs >= VKMS_MAX_OUTPUT_OBJECTS)
+		return ERR_PTR(-ENOMEM);
+
+	vkms_crtc = &vkmsdev->output.crtcs[vkmsdev->output.num_crtcs++];
+
+	ret = drmm_crtc_init_with_planes(dev, &vkms_crtc->base, primary, cursor,
  					 &vkms_crtc_funcs, NULL);
  	if (ret) {
  		DRM_ERROR("Failed to init CRTC\n");
-		return ret;
+		goto out_error;
  	}
- drm_crtc_helper_add(crtc, &vkms_crtc_helper_funcs);
+	drm_crtc_helper_add(&vkms_crtc->base, &vkms_crtc_helper_funcs);
- drm_mode_crtc_set_gamma_size(crtc, VKMS_LUT_SIZE);
-	drm_crtc_enable_color_mgmt(crtc, 0, false, VKMS_LUT_SIZE);
+	drm_mode_crtc_set_gamma_size(&vkms_crtc->base, VKMS_LUT_SIZE);
+	drm_crtc_enable_color_mgmt(&vkms_crtc->base, 0, false, VKMS_LUT_SIZE);
- spin_lock_init(&vkms_out->lock);
-	spin_lock_init(&vkms_out->composer_lock);
-	mutex_init(&vkms_out->enabled_lock);
+	spin_lock_init(&vkms_crtc->lock);
+	spin_lock_init(&vkms_crtc->composer_lock);
+	mutex_init(&vkms_crtc->enabled_lock);
- vkms_out->composer_workq = alloc_ordered_workqueue("vkms_composer", 0);
-	if (!vkms_out->composer_workq)
-		return -ENOMEM;
+	vkms_crtc->composer_workq = alloc_ordered_workqueue("vkms_composer", 0);
+	if (!vkms_crtc->composer_workq) {
+		ret = -ENOMEM;
+		goto out_error;
+	}
+
+	return vkms_crtc;
- return ret;
+out_error:
+	memset(vkms_crtc, 0, sizeof(*vkms_crtc));
+	vkmsdev->output.num_crtcs -= 1;
+	return ERR_PTR(ret);
  }
diff --git a/drivers/gpu/drm/vkms/vkms_drv.c b/drivers/gpu/drm/vkms/vkms_drv.c
index 387c832f5dc9..65b1e2c52106 100644
--- a/drivers/gpu/drm/vkms/vkms_drv.c
+++ b/drivers/gpu/drm/vkms/vkms_drv.c
@@ -57,8 +57,8 @@ static void vkms_release(struct drm_device *dev)
  {
  	struct vkms_device *vkms = drm_device_to_vkms_device(dev);
- if (vkms->output.composer_workq)
-		destroy_workqueue(vkms->output.composer_workq);
+	for (int i = 0; i < vkms->output.num_crtcs; i++)
+		destroy_workqueue(vkms->output.crtcs[i].composer_workq);
  }
static void vkms_atomic_commit_tail(struct drm_atomic_state *old_state)
@@ -203,15 +203,15 @@ static int vkms_platform_probe(struct platform_device *pdev)
  		goto out_release_group;
  	}
- ret = drm_vblank_init(&vkms_device->drm, 1);
+	ret = vkms_modeset_init(vkms_device);
  	if (ret) {
-		DRM_ERROR("Failed to vblank\n");
+		DRM_ERROR("Unable to initialize modesetting\n");
  		goto out_release_group;
  	}
- ret = vkms_modeset_init(vkms_device);
+	ret = drm_vblank_init(&vkms_device->drm, vkms_device->output.num_crtcs);
  	if (ret) {
-		DRM_ERROR("Unable to initialize modesetting\n");
+		DRM_ERROR("Failed to vblank\n");
  		goto out_release_group;
  	}
diff --git a/drivers/gpu/drm/vkms/vkms_drv.h b/drivers/gpu/drm/vkms/vkms_drv.h
index 4c35d6305f2a..761cd809617e 100644
--- a/drivers/gpu/drm/vkms/vkms_drv.h
+++ b/drivers/gpu/drm/vkms/vkms_drv.h
@@ -23,6 +23,10 @@
#define NUM_OVERLAY_PLANES 8 +
+#define VKMS_MAX_OUTPUT_OBJECTS 16
+#define VKMS_MAX_PLANES (3 * VKMS_MAX_OUTPUT_OBJECTS)
+
  #define VKMS_LUT_SIZE 256
struct vkms_frame_info {
@@ -66,6 +70,27 @@ struct vkms_plane {
  	struct drm_plane base;
  };
+struct vkms_crtc {
+	struct drm_crtc base;
+
+	struct drm_writeback_connector wb_connector;
+	struct hrtimer vblank_hrtimer;
+	ktime_t period_ns;
+	struct drm_pending_vblank_event *event;
+	/* ordered wq for composer_work */
+	struct workqueue_struct *composer_workq;
+	/* protects concurrent access to composer */
+	spinlock_t lock;
+	/* guarantees that if the composer is enabled, a job will be queued */
+	struct mutex enabled_lock;
+
+	/* protected by @enabled_lock */
+	bool composer_enabled;
+	struct vkms_crtc_state *composer_state;
+
+	spinlock_t composer_lock;
+};
+
  struct vkms_color_lut {
  	struct drm_color_lut *base;
  	size_t lut_length;
@@ -97,25 +122,14 @@ struct vkms_crtc_state {
  };
struct vkms_output {
-	struct drm_crtc crtc;
-	struct drm_encoder encoder;
-	struct drm_connector connector;
-	struct drm_writeback_connector wb_connector;
-	struct hrtimer vblank_hrtimer;
-	ktime_t period_ns;
-	struct drm_pending_vblank_event *event;
-	/* ordered wq for composer_work */
-	struct workqueue_struct *composer_workq;
-	/* protects concurrent access to composer */
-	spinlock_t lock;
-	/* guarantees that if the composer is enabled, a job will be queued */
-	struct mutex enabled_lock;
-
-	/* protected by @enabled_lock */
-	bool composer_enabled;
-	struct vkms_crtc_state *composer_state;
-
-	spinlock_t composer_lock;
+	int num_crtcs;
+	struct vkms_crtc crtcs[VKMS_MAX_OUTPUT_OBJECTS];
+	int num_encoders;
+	struct drm_encoder encoders[VKMS_MAX_OUTPUT_OBJECTS];
+	int num_connectors;
+	struct drm_connector connectors[VKMS_MAX_OUTPUT_OBJECTS];
+	int num_planes;
+	struct vkms_plane planes[VKMS_MAX_PLANES];
  };
struct vkms_device;
@@ -133,12 +147,14 @@ struct vkms_device {
  	struct vkms_config config;
  };
-#define drm_crtc_to_vkms_output(target) \
-	container_of(target, struct vkms_output, crtc)
+#define drm_crtc_to_vkms_crtc(crtc) container_of(crtc, struct vkms_crtc, base)
#define drm_device_to_vkms_device(target) \
  	container_of(target, struct vkms_device, drm)
+#define timer_to_vkms_crtc(timer) \
+	container_of(timer, struct vkms_crtc, vblank_hrtimer)
+
  #define to_vkms_crtc_state(target)\
  	container_of(target, struct vkms_crtc_state, base)
@@ -146,13 +162,14 @@ struct vkms_device {
  	container_of(target, struct vkms_plane_state, base.base)
/* CRTC */
-int vkms_crtc_init(struct drm_device *dev, struct drm_crtc *crtc,
-		   struct drm_plane *primary, struct drm_plane *cursor);
+struct vkms_crtc *vkms_crtc_init(struct vkms_device *vkmsdev,
+				 struct drm_plane *primary,
+				 struct drm_plane *cursor);
int vkms_output_init(struct vkms_device *vkmsdev, int index); struct vkms_plane *vkms_plane_init(struct vkms_device *vkmsdev,
-				   enum drm_plane_type type, int index);
+				   enum drm_plane_type type);
/* CRC Support */
  const char *const *vkms_get_crc_sources(struct drm_crtc *crtc,
@@ -163,11 +180,12 @@ int vkms_verify_crc_source(struct drm_crtc *crtc, const char *source_name,
/* Composer Support */
  void vkms_composer_worker(struct work_struct *work);
-void vkms_set_composer(struct vkms_output *out, bool enabled);
+void vkms_set_composer(struct vkms_crtc *vkms_crtc, bool enabled);
  void vkms_compose_row(struct line_buffer *stage_buffer, struct vkms_plane_state *plane, int y);
  void vkms_writeback_row(struct vkms_writeback_job *wb, const struct line_buffer *src_buffer, int y);
/* Writeback */
-int vkms_enable_writeback_connector(struct vkms_device *vkmsdev);
+int vkms_enable_writeback_connector(struct vkms_device *vkmsdev,
+				    struct vkms_crtc *vkms_crtc);
#endif /* _VKMS_DRV_H_ */
diff --git a/drivers/gpu/drm/vkms/vkms_output.c b/drivers/gpu/drm/vkms/vkms_output.c
index 963a64cf068b..86faf94f7408 100644
--- a/drivers/gpu/drm/vkms/vkms_output.c
+++ b/drivers/gpu/drm/vkms/vkms_output.c
@@ -1,9 +1,13 @@
  // SPDX-License-Identifier: GPL-2.0+
-#include "vkms_drv.h"
  #include <drm/drm_atomic_helper.h>
+#include <drm/drm_connector.h>
  #include <drm/drm_edid.h>
+#include <drm/drm_encoder.h>
  #include <drm/drm_probe_helper.h>
+#include <drm/drm_simple_kms_helper.h>
+
+#include "vkms_drv.h"
static const struct drm_connector_funcs vkms_connector_funcs = {
  	.fill_modes = drm_helper_probe_single_connector_modes,
@@ -28,74 +32,116 @@ static int vkms_conn_get_modes(struct drm_connector *connector)
  }
static const struct drm_connector_helper_funcs vkms_conn_helper_funcs = {
-	.get_modes    = vkms_conn_get_modes,
+	.get_modes = vkms_conn_get_modes,
  };
-static int vkms_add_overlay_plane(struct vkms_device *vkmsdev, int index,
-				  struct drm_crtc *crtc)
+static struct drm_connector *
+vkms_connector_init(struct vkms_device *vkms_device)
  {
-	struct vkms_plane *overlay;
+	struct drm_connector *connector;
+	int ret;
- overlay = vkms_plane_init(vkmsdev, DRM_PLANE_TYPE_OVERLAY, index);
-	if (IS_ERR(overlay))
-		return PTR_ERR(overlay);
+	if (vkms_device->output.num_connectors >= VKMS_MAX_OUTPUT_OBJECTS)
+		return ERR_PTR(-ENOMEM);
- if (!overlay->base.possible_crtcs)
-		overlay->base.possible_crtcs = drm_crtc_mask(crtc);
+	connector = &vkms_device->output
+			     .connectors[vkms_device->output.num_connectors++];
+	ret = drm_connector_init(&vkms_device->drm, connector,
+				 &vkms_connector_funcs,
+				 DRM_MODE_CONNECTOR_VIRTUAL);
+	if (ret) {
+		memset(connector, 0, sizeof(*connector));
+		vkms_device->output.num_connectors -= 1;
+		return ERR_PTR(ret);
+	}
- return 0;
+	drm_connector_helper_add(connector, &vkms_conn_helper_funcs);
+
+	return connector;
+}
+
+static struct drm_encoder *vkms_encoder_init(struct vkms_device *vkms_device)
+{
+	struct drm_encoder *encoder;
+	int ret;
+
+	if (vkms_device->output.num_encoders >= VKMS_MAX_OUTPUT_OBJECTS)
+		return ERR_PTR(-ENOMEM);
+
+	encoder = &vkms_device->output
+			   .encoders[vkms_device->output.num_encoders++];
+	ret = drm_encoder_init(&vkms_device->drm, encoder, &vkms_encoder_funcs,
+			       DRM_MODE_ENCODER_VIRTUAL, NULL);
+	if (ret) {
+		memset(encoder, 0, sizeof(*encoder));
+		vkms_device->output.num_encoders -= 1;
+		return ERR_PTR(ret);
+	}
+	return encoder;
  }
int vkms_output_init(struct vkms_device *vkmsdev, int index)
  {
  	struct vkms_output *output = &vkmsdev->output;
  	struct drm_device *dev = &vkmsdev->drm;
-	struct drm_connector *connector = &output->connector;
-	struct drm_encoder *encoder = &output->encoder;
-	struct drm_crtc *crtc = &output->crtc;
+	struct drm_connector *connector;
+	struct drm_encoder *encoder;
+	struct vkms_crtc *vkms_crtc;
  	struct vkms_plane *primary, *cursor = NULL;
  	int ret;
  	int writeback;
  	unsigned int n;
- primary = vkms_plane_init(vkmsdev, DRM_PLANE_TYPE_PRIMARY, index);
+	primary = vkms_plane_init(vkmsdev, DRM_PLANE_TYPE_PRIMARY);
  	if (IS_ERR(primary))
  		return PTR_ERR(primary);
if (vkmsdev->config.overlay) {
  		for (n = 0; n < NUM_OVERLAY_PLANES; n++) {
-			ret = vkms_add_overlay_plane(vkmsdev, index, crtc);
-			if (ret)
-				return ret;
+			struct vkms_plane *overlay = vkms_plane_init(
+				vkmsdev, DRM_PLANE_TYPE_OVERLAY);
+			if (IS_ERR(overlay)) {
+				ret = PTR_ERR(overlay);
+				goto err_planes;
+			}
  		}
  	}
if (vkmsdev->config.cursor) {
-		cursor = vkms_plane_init(vkmsdev, DRM_PLANE_TYPE_CURSOR, index);
-		if (IS_ERR(cursor))
-			return PTR_ERR(cursor);
+		cursor = vkms_plane_init(vkmsdev, DRM_PLANE_TYPE_CURSOR);
+		if (IS_ERR(cursor)) {
+			ret = PTR_ERR(cursor);
+			goto err_planes;
+		}
  	}
- ret = vkms_crtc_init(dev, crtc, &primary->base, &cursor->base);
-	if (ret)
-		return ret;
+	vkms_crtc = vkms_crtc_init(vkmsdev, &primary->base,
+				   cursor ? &cursor->base : NULL);
+	if (IS_ERR(vkms_crtc)) {
+		DRM_ERROR("Failed to init crtc\n");
+		ret = PTR_ERR(vkms_crtc);
+		goto err_planes;
+	}
- ret = drm_connector_init(dev, connector, &vkms_connector_funcs,
-				 DRM_MODE_CONNECTOR_VIRTUAL);
-	if (ret) {
+	for (int i = 0; i < vkmsdev->output.num_planes; i++) {
+		vkmsdev->output.planes[i].base.possible_crtcs |=
+			drm_crtc_mask(&vkms_crtc->base);
+	}
+
+	connector = vkms_connector_init(vkmsdev);
+	if (IS_ERR(connector)) {
  		DRM_ERROR("Failed to init connector\n");
+		ret = PTR_ERR(connector);
  		goto err_connector;
  	}
- drm_connector_helper_add(connector, &vkms_conn_helper_funcs);
-
-	ret = drm_encoder_init(dev, encoder, &vkms_encoder_funcs,
-			       DRM_MODE_ENCODER_VIRTUAL, NULL);
-	if (ret) {
+	encoder = vkms_encoder_init(vkmsdev);
+	if (IS_ERR(encoder)) {
  		DRM_ERROR("Failed to init encoder\n");
+		ret = PTR_ERR(encoder);
  		goto err_encoder;
  	}
-	encoder->possible_crtcs = 1;
+	encoder->possible_crtcs |= drm_crtc_mask(&vkms_crtc->base);
ret = drm_connector_attach_encoder(connector, encoder);
  	if (ret) {
@@ -104,7 +150,7 @@ int vkms_output_init(struct vkms_device *vkmsdev, int index)
  	}
if (vkmsdev->config.writeback) {
-		writeback = vkms_enable_writeback_connector(vkmsdev);
+		writeback = vkms_enable_writeback_connector(vkmsdev, vkms_crtc);
  		if (writeback)
  			DRM_ERROR("Failed to init writeback connector\n");
  	}
@@ -120,7 +166,13 @@ int vkms_output_init(struct vkms_device *vkmsdev, int index)
  	drm_connector_cleanup(connector);
err_connector:
-	drm_crtc_cleanup(crtc);
+	drm_crtc_cleanup(&vkms_crtc->base);
+
+err_planes:
+	for (int i = 0; i < output->num_planes; i++)
+		drm_plane_cleanup(&output->planes[i].base);
+
+	memset(output, 0, sizeof(*output));
return ret;
  }
diff --git a/drivers/gpu/drm/vkms/vkms_plane.c b/drivers/gpu/drm/vkms/vkms_plane.c
index e5c625ab8e3e..950e6c930273 100644
--- a/drivers/gpu/drm/vkms/vkms_plane.c
+++ b/drivers/gpu/drm/vkms/vkms_plane.c
@@ -8,6 +8,8 @@
  #include <drm/drm_fourcc.h>
  #include <drm/drm_gem_atomic_helper.h>
  #include <drm/drm_gem_framebuffer_helper.h>
+#include <drm/drm_plane.h>
+#include <drm/drm_plane_helper.h>
#include "vkms_drv.h"
  #include "vkms_formats.h"
@@ -65,6 +67,20 @@ static void vkms_plane_destroy_state(struct drm_plane *plane,
  	kfree(vkms_state);
  }
+static void vkms_plane_destroy(struct drm_plane *plane)
+{
+	struct vkms_plane *vkms_plane =
+		container_of(plane, struct vkms_plane, base);
+
+	if (plane->state) {
+		vkms_plane_destroy_state(plane, plane->state);
+		plane->state = NULL;
+	}
+
+	drm_plane_cleanup(plane);
+	memset(vkms_plane, 0, sizeof(struct vkms_plane));
+}
+
  static void vkms_plane_reset(struct drm_plane *plane)
  {
  	struct vkms_plane_state *vkms_state;
@@ -86,9 +102,10 @@ static void vkms_plane_reset(struct drm_plane *plane)
  static const struct drm_plane_funcs vkms_plane_funcs = {
  	.update_plane		= drm_atomic_helper_update_plane,
  	.disable_plane		= drm_atomic_helper_disable_plane,
+	.destroy = vkms_plane_destroy,
  	.reset			= vkms_plane_reset,
  	.atomic_duplicate_state = vkms_plane_duplicate_state,
-	.atomic_destroy_state	= vkms_plane_destroy_state,
+	.atomic_destroy_state = vkms_plane_destroy_state,
  };
static void vkms_plane_atomic_update(struct drm_plane *plane,
@@ -198,17 +215,22 @@ static const struct drm_plane_helper_funcs vkms_plane_helper_funcs = {
  };
struct vkms_plane *vkms_plane_init(struct vkms_device *vkmsdev,
-				   enum drm_plane_type type, int index)
+				   enum drm_plane_type type)
  {
  	struct drm_device *dev = &vkmsdev->drm;
+	struct vkms_output *output = &vkmsdev->output;
  	struct vkms_plane *plane;
+	int ret;
- plane = drmm_universal_plane_alloc(dev, struct vkms_plane, base, 1 << index,
-					   &vkms_plane_funcs,
-					   vkms_formats, ARRAY_SIZE(vkms_formats),
-					   NULL, type, NULL);
-	if (IS_ERR(plane))
-		return plane;
+	if (output->num_planes >= VKMS_MAX_PLANES)
+		return ERR_PTR(-ENOMEM);
+
+	plane = &output->planes[output->num_planes++];
+	ret = drm_universal_plane_init(dev, &plane->base, 0, &vkms_plane_funcs,
+				       vkms_formats, ARRAY_SIZE(vkms_formats),
+				       NULL, type, NULL);
+	if (ret)
+		return ERR_PTR(ret);
drm_plane_helper_add(&plane->base, &vkms_plane_helper_funcs); diff --git a/drivers/gpu/drm/vkms/vkms_writeback.c b/drivers/gpu/drm/vkms/vkms_writeback.c
index d7e63aa14663..92565e3e25f6 100644
--- a/drivers/gpu/drm/vkms/vkms_writeback.c
+++ b/drivers/gpu/drm/vkms/vkms_writeback.c
@@ -1,6 +1,7 @@
  // SPDX-License-Identifier: GPL-2.0+
#include <linux/iosys-map.h>
+#include <linux/kernel.h>
#include <drm/drm_atomic.h>
  #include <drm/drm_edid.h>
@@ -102,7 +103,8 @@ static void vkms_wb_cleanup_job(struct drm_writeback_connector *connector,
  				struct drm_writeback_job *job)
  {
  	struct vkms_writeback_job *vkmsjob = job->priv;
-	struct vkms_device *vkmsdev;
+	struct vkms_crtc *vkms_crtc =
+		container_of(connector, struct vkms_crtc, wb_connector);
if (!job->fb)
  		return;
@@ -111,8 +113,7 @@ static void vkms_wb_cleanup_job(struct drm_writeback_connector *connector,
drm_framebuffer_put(vkmsjob->wb_frame_info.fb); - vkmsdev = drm_device_to_vkms_device(job->fb->dev);
-	vkms_set_composer(&vkmsdev->output, false);
+	vkms_set_composer(vkms_crtc, false);
  	kfree(vkmsjob);
  }
@@ -121,11 +122,10 @@ static void vkms_wb_atomic_commit(struct drm_connector *conn,
  {
  	struct drm_connector_state *connector_state = drm_atomic_get_new_connector_state(state,
  											 conn);
-	struct vkms_device *vkmsdev = drm_device_to_vkms_device(conn->dev);
-	struct vkms_output *output = &vkmsdev->output;
-	struct drm_writeback_connector *wb_conn = &output->wb_connector;
-	struct drm_connector_state *conn_state = wb_conn->base.state;
-	struct vkms_crtc_state *crtc_state = output->composer_state;
+	struct vkms_crtc *vkms_crtc =
+		drm_crtc_to_vkms_crtc(connector_state->crtc);
+	struct drm_writeback_connector *wb_conn = &vkms_crtc->wb_connector;
+	struct vkms_crtc_state *crtc_state = vkms_crtc->composer_state;
  	struct drm_framebuffer *fb = connector_state->writeback_job->fb;
  	u16 crtc_height = crtc_state->base.crtc->mode.vdisplay;
  	u16 crtc_width = crtc_state->base.crtc->mode.hdisplay;
@@ -133,23 +133,25 @@ static void vkms_wb_atomic_commit(struct drm_connector *conn,
  	struct vkms_frame_info *wb_frame_info;
  	u32 wb_format = fb->format->format;
- if (!conn_state)
+	if (!connector_state)
  		return;
- vkms_set_composer(&vkmsdev->output, true);
+	vkms_set_composer(vkms_crtc, true);
- active_wb = conn_state->writeback_job->priv;
+	active_wb = connector_state->writeback_job->priv;
  	wb_frame_info = &active_wb->wb_frame_info;
- spin_lock_irq(&output->composer_lock);
+	spin_lock_irq(&vkms_crtc->composer_lock);
  	crtc_state->active_writeback = active_wb;
  	crtc_state->wb_pending = true;
-	spin_unlock_irq(&output->composer_lock);
+	spin_unlock_irq(&vkms_crtc->composer_lock);
wb_frame_info->offset = fb->offsets[0];
  	wb_frame_info->pitch = fb->pitches[0];
  	wb_frame_info->cpp = fb->format->cpp[0];
+ crtc_state->wb_pending = true;
+	spin_unlock_irq(&vkms_crtc->composer_lock);

Both wb_pending and the composer_lock have been set and unlocked a few lines above, looks like just duplicated lines.

  	drm_writeback_queue_job(wb_conn, connector_state);
  	active_wb->pixel_write = get_pixel_write_function(wb_format);
  	drm_rect_init(&wb_frame_info->src, 0, 0, crtc_width, crtc_height);
@@ -163,9 +165,10 @@ static const struct drm_connector_helper_funcs vkms_wb_conn_helper_funcs = {
  	.atomic_commit = vkms_wb_atomic_commit,
  };
-int vkms_enable_writeback_connector(struct vkms_device *vkmsdev)
+int vkms_enable_writeback_connector(struct vkms_device *vkmsdev,
+				    struct vkms_crtc *vkms_crtc)
  {
-	struct drm_writeback_connector *wb = &vkmsdev->output.wb_connector;
+	struct drm_writeback_connector *wb = &vkms_crtc->wb_connector;
drm_connector_helper_add(&wb->base, &vkms_wb_conn_helper_funcs);



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