[PATCH RFC 3/4] drm/vkms: Switch to managed for crtc
Louis Chauvet
louis.chauvet at bootlin.com
Mon Aug 26 16:24:28 UTC 2024
Le 20/08/24 - 11:09, José Expósito a écrit :
> > The current VKMS driver uses non-managed function to create crtcs. It
>
> s/crtcs/CRTCs
>
> > is not an issue yet, but in order to support multiple devices easly,
>
> s/easly/easily
>
> > convert this code to use drm and device managed helpers.
> >
> > Signed-off-by: Louis Chauvet <louis.chauvet at bootlin.com>
>
> I think that this patch is doing different things that we could split in simpler
> diffs.
>
> Moving the code from vkms_output.c to vkms_drv.c be its own patch.
I agree, but for the v2 I will not move anything outside vkms_output. It
will be a future patch, maybe in the extract header series or
vkms_config/configfs.
> I'm not sure whether the calls to drm_mode_crtc_set_gamma_size() and
> drm_crtc_enable_color_mgmt() should go here or they belong to a different patch.
I did not introduce new calls to those functions, just the test about the
result of drm_mode_crtc_set_gamma_size that can fail. I will extract this
to an other patch.
> Other than that, I added a couple of comments:
Thanks!
> > ---
> > drivers/gpu/drm/vkms/vkms_composer.c | 10 +--
> > drivers/gpu/drm/vkms/vkms_composer.h | 2 +-
> > drivers/gpu/drm/vkms/vkms_crtc.c | 75 ++++++++++++-------
> > drivers/gpu/drm/vkms/vkms_crtc.h | 19 +++--
> > drivers/gpu/drm/vkms/vkms_drv.c | 134 ++++++++++++++++++++++++++++++---
> > drivers/gpu/drm/vkms/vkms_drv.h | 43 -----------
> > drivers/gpu/drm/vkms/vkms_output.c | 135 ----------------------------------
> > drivers/gpu/drm/vkms/vkms_writeback.c | 20 +++--
> > drivers/gpu/drm/vkms/vkms_writeback.h | 2 +-
> > 9 files changed, 197 insertions(+), 243 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/vkms/vkms_composer.c b/drivers/gpu/drm/vkms/vkms_composer.c
> > index 15ef07ed304e..9b2f578c2eb1 100644
> > --- a/drivers/gpu/drm/vkms/vkms_composer.c
> > +++ b/drivers/gpu/drm/vkms/vkms_composer.c
> > @@ -515,7 +515,7 @@ 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 *out = drm_crtc_to_vkms_crtc(crtc);
> > bool crc_pending, wb_pending;
> > u64 frame_start, frame_end;
> > u32 crc32 = 0;
> > @@ -616,12 +616,12 @@ 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 *out, bool enabled)
> > {
> > bool old_enabled;
> >
> > if (enabled)
> > - drm_crtc_vblank_get(&out->crtc);
> > + drm_crtc_vblank_get(&out->base);
> >
> > spin_lock_irq(&out->lock);
> > old_enabled = out->composer_enabled;
> > @@ -629,12 +629,12 @@ void vkms_set_composer(struct vkms_output *out, bool enabled)
> > spin_unlock_irq(&out->lock);
> >
> > if (old_enabled)
> > - drm_crtc_vblank_put(&out->crtc);
> > + drm_crtc_vblank_put(&out->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_composer.h b/drivers/gpu/drm/vkms/vkms_composer.h
> > index 91b33af1e013..77efd2e3a63a 100644
> > --- a/drivers/gpu/drm/vkms/vkms_composer.h
> > +++ b/drivers/gpu/drm/vkms/vkms_composer.h
> > @@ -7,7 +7,7 @@
> > #include "vkms_crtc.h"
> >
> > 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 *out, bool enabled);
> >
> > /* CRC Support */
> > const char *const *vkms_get_crc_sources(struct drm_crtc *crtc, size_t *count);
> > diff --git a/drivers/gpu/drm/vkms/vkms_crtc.c b/drivers/gpu/drm/vkms/vkms_crtc.c
> > index 6fae43932b60..47e62fb3e404 100644
> > --- a/drivers/gpu/drm/vkms/vkms_crtc.c
> > +++ b/drivers/gpu/drm/vkms/vkms_crtc.c
> > @@ -6,6 +6,8 @@
> > #include <drm/drm_atomic_helper.h>
> > #include <drm/drm_probe_helper.h>
> > #include <drm/drm_vblank.h>
> > +#include <drm/drm_managed.h>
> > +#include <drm/drm_gem_atomic_helper.h>
> > #include <drm/drm_print.h>
> >
> > #include "vkms_crtc.h"
> > @@ -14,9 +16,8 @@
> >
> > 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 *output = hrtimer_to_vkms_crtc(timer);
> > + struct drm_crtc *crtc = &output->base;
> > struct vkms_crtc_state *state;
> > u64 ret_overrun;
> > bool ret, fence_cookie;
> > @@ -64,8 +65,9 @@ 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;
>
> I think this variable should throw warning because it is unused.
Yes, and I have few other that I missed, will fix for v2.
> I imagine you are already doing it but you can compile with "make W=1 C=1" to
> get this errors in the log.
>
> > struct drm_vblank_crtc *vblank = drm_crtc_vblank_crtc(crtc);
> > - struct vkms_output *out = drm_crtc_to_vkms_output(crtc);
> > + struct vkms_crtc *out = drm_crtc_to_vkms_crtc(crtc);
> >
> > drm_calc_timestamping_constants(crtc, &crtc->mode);
> >
> > @@ -79,7 +81,7 @@ static int vkms_enable_vblank(struct drm_crtc *crtc)
> >
> > static void vkms_disable_vblank(struct drm_crtc *crtc)
> > {
> > - struct vkms_output *out = drm_crtc_to_vkms_output(crtc);
> > + struct vkms_crtc *out = drm_crtc_to_vkms_crtc(crtc);
> >
> > hrtimer_cancel(&out->vblank_hrtimer);
> > }
> > @@ -89,8 +91,7 @@ static bool vkms_get_vblank_timestamp(struct drm_crtc *crtc,
> > bool in_vblank_irq)
> > {
> > struct drm_device *dev = crtc->dev;
>
> This one should throw a warning as well.
>
> > - struct vkms_device *vkmsdev = drm_device_to_vkms_device(dev);
> > - struct vkms_output *output = &vkmsdev->output;
> > + struct vkms_crtc *output = drm_crtc_to_vkms_crtc(crtc);
> > struct drm_vblank_crtc *vblank = drm_crtc_vblank_crtc(crtc);
> >
> > if (!READ_ONCE(vblank->enabled)) {
> > @@ -137,7 +138,7 @@ vkms_atomic_crtc_duplicate_state(struct drm_crtc *crtc)
> > static void vkms_atomic_crtc_destroy_state(struct drm_crtc *crtc,
> > struct drm_crtc_state *state)
> > {
> > - struct vkms_crtc_state *vkms_state = to_vkms_crtc_state(state);
> > + struct vkms_crtc_state *vkms_state = drm_crtc_state_to_vkms_crtc_state(state);
> >
> > __drm_atomic_helper_crtc_destroy_state(state);
> >
> > @@ -178,7 +179,7 @@ static int vkms_crtc_atomic_check(struct drm_crtc *crtc,
> > {
> > struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state,
> > crtc);
> > - struct vkms_crtc_state *vkms_state = to_vkms_crtc_state(crtc_state);
> > + struct vkms_crtc_state *vkms_state = drm_crtc_state_to_vkms_crtc_state(crtc_state);
> > struct drm_plane *plane;
> > struct drm_plane_state *plane_state;
> > int i = 0, ret;
> > @@ -234,7 +235,7 @@ 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_output = 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
> > @@ -245,7 +246,7 @@ static void vkms_crtc_atomic_begin(struct drm_crtc *crtc,
> > 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_output = drm_crtc_to_vkms_crtc(crtc);
> >
> > if (crtc->state->event) {
> > spin_lock(&crtc->dev->event_lock);
> > @@ -260,7 +261,7 @@ 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_output->composer_state = drm_crtc_state_to_vkms_crtc_state(crtc->state);
> >
> > spin_unlock_irq(&vkms_output->lock);
> > }
> > @@ -273,30 +274,48 @@ 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)
> > +static void vkms_crtc_destroy_workqueue(struct drm_device *dev, void *raw_vkms_crtc)
> > +{
> > + struct vkms_crtc *vkms_crtc = raw_vkms_crtc;
> > +
> > + destroy_workqueue(vkms_crtc->composer_workq);
>
> I think that you might need to check "if (vkms_crtc->composer_workq)" first.
>
> Check "git show 2fe2a8f40c21" for the explanation.
I don't think this is needed, this function can only be called once
drmm_add_action_or_reset, which is after the call to
alloc_ordered_workqueue, so I think the situation described in
2fe2a8f40c21 is impossible now. I can leave a comment before this
destroy_workqueue if you think this could cause an issue.
> > +}
> > +
> > +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,
> > - &vkms_crtc_funcs, NULL);
> > + vkms_crtc = drmm_crtc_alloc_with_planes(dev, struct vkms_crtc, base, primary, cursor,
> > + &vkms_crtc_funcs, NULL);
> > + if (IS_ERR(vkms_crtc)) {
> > + DRM_DEV_ERROR(vkmsdev->drm.dev, "Failed to init CRTC\n");
>
> Why DRM_DEV_ERROR() instead of DRM_ERROR()?
Because this is related to a specific device, I think using DRM_DEV_*
would be better. When we introduce ConfigFS, the userspace might be able
to break things, so tracking which device failed can be helpful.
> > + return vkms_crtc;
> > + }
> > +
> > + drm_crtc_helper_add(&vkms_crtc->base, &vkms_crtc_helper_funcs);
> > +
> > + ret = drm_mode_crtc_set_gamma_size(&vkms_crtc->base, VKMS_LUT_SIZE);
> > if (ret) {
> > - DRM_ERROR("Failed to init CRTC\n");
> > - return ret;
> > + DRM_DEV_ERROR(vkmsdev->drm.dev, "Failed to set gamma size\n");
> > + return ERR_PTR(ret);
> > }
> >
> > - drm_crtc_helper_add(crtc, &vkms_crtc_helper_funcs);
> > + drm_crtc_enable_color_mgmt(&vkms_crtc->base, 0, false, VKMS_LUT_SIZE);
> >
> > - drm_mode_crtc_set_gamma_size(crtc, VKMS_LUT_SIZE);
> > - drm_crtc_enable_color_mgmt(crtc, 0, false, VKMS_LUT_SIZE);
> > + spin_lock_init(&vkms_crtc->lock);
> > + spin_lock_init(&vkms_crtc->composer_lock);
> >
> > - spin_lock_init(&vkms_out->lock);
> > - spin_lock_init(&vkms_out->composer_lock);
> > + vkms_crtc->composer_workq = alloc_ordered_workqueue("vkms_composer", 0);
> > + if (!vkms_crtc->composer_workq)
> > + return ERR_PTR(-ENOMEM);
> >
> > - vkms_out->composer_workq = alloc_ordered_workqueue("vkms_composer", 0);
> > - if (!vkms_out->composer_workq)
> > - return -ENOMEM;
> > + ret = drmm_add_action_or_reset(&vkmsdev->drm, vkms_crtc_destroy_workqueue, vkms_crtc);
>
> &vkmsdev->drm => dev
>
> > + if (ret)
> > + return ERR_PTR(ret);
> >
> > - return ret;
> > + return vkms_crtc;
> > }
> > diff --git a/drivers/gpu/drm/vkms/vkms_crtc.h b/drivers/gpu/drm/vkms/vkms_crtc.h
> > index 9f5ce21f3425..dde28884a0a5 100644
> > --- a/drivers/gpu/drm/vkms/vkms_crtc.h
> > +++ b/drivers/gpu/drm/vkms/vkms_crtc.h
> > @@ -48,7 +48,6 @@ struct vkms_crtc_state {
> > * @wb_connecter: DRM writeback connector used for this output
> > * @vblank_hrtimer:
> > * @period_ns:
> > - * @event:
> > * @composer_workq: Ordered workqueue for composer_work
> > * @lock: Lock used to project concurrent acces to the composer
> > * @composer_enabled: Protected by @lock.
> > @@ -61,7 +60,6 @@ struct vkms_crtc {
> > struct drm_writeback_connector wb_connector;
> > struct hrtimer vblank_hrtimer;
> > ktime_t period_ns;
> > - struct drm_pending_vblank_event *event;
>
> Commit f3a47a269119 ("drm/vkms: Remove event from vkms_output") removed this
> field. You might need to rebase this patch.
It was not merged yet when I wrote this code, thanks for the reminder!
>
> > struct workqueue_struct *composer_workq;
> > spinlock_t lock;
> >
> > @@ -71,17 +69,22 @@ struct vkms_crtc {
> > spinlock_t composer_lock;
> > };
> >
> > -#define to_vkms_crtc_state(target)\
> > +#define drm_crtc_state_to_vkms_crtc_state(target)\
> > container_of(target, struct vkms_crtc_state, base)
> >
> > +#define drm_crtc_to_vkms_crtc(target) \
> > + container_of(target, struct vkms_crtc, base)
> > +
> > +#define hrtimer_to_vkms_crtc(target) \
> > + container_of(target, struct vkms_crtc, vblank_hrtimer)
> > +
> > /**
> > * vkms_crtc_init() - Initialize a crtc for vkms
> > - * @dev: drm_device associated with the vkms buffer
> > - * @crtc: uninitialized crtc device
> > + * @vkmsdev: drm_device associated with the vkms buffer
> > * @primary: primary plane to attach to the crtc
> > * @cursor plane to attach to the 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);
> > #endif //_VKMS_CRTC_H
> > diff --git a/drivers/gpu/drm/vkms/vkms_drv.c b/drivers/gpu/drm/vkms/vkms_drv.c
> > index 5907877bdfa0..e79832e10f3c 100644
> > --- a/drivers/gpu/drm/vkms/vkms_drv.c
> > +++ b/drivers/gpu/drm/vkms/vkms_drv.c
> > @@ -31,6 +31,7 @@
> >
> > #include <drm/drm_print.h>
> > #include <drm/drm_debugfs.h>
> > +#include <drm/drm_edid.h>
> >
> > #define DRIVER_NAME "vkms"
> > #define DRIVER_DESC "Virtual Kernel Mode Setting"
> > @@ -46,7 +47,8 @@ MODULE_PARM_DESC(enable_cursor, "Enable/Disable cursor support");
> >
> > static bool enable_writeback = true;
> > module_param_named(enable_writeback, enable_writeback, bool, 0444);
> > -MODULE_PARM_DESC(enable_writeback, "Enable/Disable writeback connector support");
> > +MODULE_PARM_DESC(enable_writeback,
> > + "Enable/Disable writeback connector support");
>
> Unwanted change?
Yep!
> > static bool enable_overlay;
> > module_param_named(enable_overlay, enable_overlay, bool, 0444);
> > @@ -54,14 +56,6 @@ MODULE_PARM_DESC(enable_overlay, "Enable/Disable overlay support");
> >
> > DEFINE_DRM_GEM_FOPS(vkms_driver_fops);
> >
> > -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);
> > -}
> > -
> > static void vkms_atomic_commit_tail(struct drm_atomic_state *old_state)
> > {
> > struct drm_device *dev = old_state->dev;
> > @@ -82,7 +76,8 @@ static void vkms_atomic_commit_tail(struct drm_atomic_state *old_state)
> > drm_atomic_helper_wait_for_flip_done(dev, old_state);
> >
> > for_each_old_crtc_in_state(old_state, crtc, old_crtc_state, i) {
> > - struct vkms_crtc_state *vkms_state = to_vkms_crtc_state(old_crtc_state);
> > + struct vkms_crtc_state *vkms_state =
> > + drm_crtc_state_to_vkms_crtc_state(old_crtc_state);
> >
> > flush_work(&vkms_state->composer_work);
> > }
> > @@ -109,7 +104,6 @@ static const struct drm_debugfs_info vkms_config_debugfs_list[] = {
> >
> > static const struct drm_driver vkms_driver = {
> > .driver_features = DRIVER_MODESET | DRIVER_ATOMIC | DRIVER_GEM,
> > - .release = vkms_release,
> > .fops = &vkms_driver_fops,
> > DRM_GEM_SHMEM_DRIVER_OPS,
> >
> > @@ -148,6 +142,124 @@ static const struct drm_mode_config_helper_funcs vkms_mode_config_helpers = {
> > .atomic_commit_tail = vkms_atomic_commit_tail,
> > };
> >
> > +static const struct drm_connector_funcs vkms_connector_funcs = {
> > + .fill_modes = drm_helper_probe_single_connector_modes,
> > + .reset = drm_atomic_helper_connector_reset,
> > + .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
> > + .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
> > +};
> > +
> > +static const struct drm_encoder_funcs vkms_encoder_funcs = {};
> > +
> > +static int vkms_conn_get_modes(struct drm_connector *connector)
> > +{
> > + int count;
> > +
> > + /* Use the default modes list from drm */
> > + count = drm_add_modes_noedid(connector, XRES_MAX, YRES_MAX);
> > + drm_set_preferred_mode(connector, XRES_DEF, YRES_DEF);
> > +
> > + return count;
> > +}
> > +
> > +static const struct drm_connector_helper_funcs vkms_conn_helper_funcs = {
> > + .get_modes = vkms_conn_get_modes,
> > +};
> > +
> > +static int vkms_output_init(struct vkms_device *vkmsdev, int possible_crtc)
> > +{
> > + struct drm_device *dev = &vkmsdev->drm;
> > + struct drm_connector *connector;
> > + struct drm_encoder *encoder;
> > + struct vkms_crtc *crtc;
> > + struct drm_plane *plane;
> > + struct vkms_plane *primary, *cursor, *overlay = NULL;
> > + int ret;
> > + int writeback;
> > + unsigned int n;
> > +
> > + /*
> > + * Initialize used plane. One primary plane is required to perform the composition.
> > + *
> > + * The overlay and cursor planes are not mandatory, but can be used to perform complex
> > + * composition.
> > + */
> > + primary = vkms_plane_init(vkmsdev, DRM_PLANE_TYPE_PRIMARY, possible_crtc);
> > + if (IS_ERR(primary))
> > + return PTR_ERR(primary);
> > +
> > + if (vkmsdev->config->overlay) {
> > + for (n = 0; n < NUM_OVERLAY_PLANES; n++) {
> > + overlay = vkms_plane_init(vkmsdev, DRM_PLANE_TYPE_OVERLAY, possible_crtc);
> > + if (IS_ERR(overlay))
> > + return PTR_ERR(overlay);
> > + }
> > + }
> > +
> > + if (vkmsdev->config->cursor) {
> > + cursor = vkms_plane_init(vkmsdev, DRM_PLANE_TYPE_CURSOR, possible_crtc);
> > + if (IS_ERR(cursor))
> > + return PTR_ERR(cursor);
> > + }
> > +
> > + /* [1]: Initialize the crtc component */
> > + crtc = vkms_crtc_init(vkmsdev, &primary->base,
> > + cursor ? &cursor->base : NULL);
> > + if (IS_ERR(crtc))
> > + return PTR_ERR(crtc);
> > +
> > + /* Enable the output's CRTC for all the planes */
> > + drm_for_each_plane(plane, &vkmsdev->drm) {
> > + plane->possible_crtcs |= drm_crtc_mask(&crtc->base);
> > + }
> > +
> > + /* Initialize the connector component */
> > + connector = drmm_kzalloc(&vkmsdev->drm, sizeof(*connector), GFP_KERNEL);
> > + if (!connector)
> > + return -ENOMEM;
> > +
> > + ret = drmm_connector_init(dev, connector, &vkms_connector_funcs,
> > + DRM_MODE_CONNECTOR_VIRTUAL, NULL);
> > + if (ret) {
> > + DRM_ERROR("Failed to init connector\n");
> > + return ret;
> > + }
> > +
> > + drm_connector_helper_add(connector, &vkms_conn_helper_funcs);
> > +
> > + /* Initialize the encoder component */
> > + encoder = drmm_kzalloc(&vkmsdev->drm, sizeof(*encoder), GFP_KERNEL);
> > + if (!encoder)
> > + return -ENOMEM;
> > +
> > + ret = drmm_encoder_init(dev, encoder, &vkms_encoder_funcs,
> > + DRM_MODE_ENCODER_VIRTUAL, NULL);
> > + if (ret) {
> > + DRM_ERROR("Failed to init encoder\n");
> > + return ret;
> > + }
> > +
> > + encoder->possible_crtcs = drm_crtc_mask(&crtc->base);
> > +
> > + /* Attach the encoder and the connector */
> > + ret = drm_connector_attach_encoder(connector, encoder);
> > + if (ret) {
> > + DRM_ERROR("Failed to attach connector to encoder\n");
> > + return ret;
> > + }
> > +
> > + /* Initialize the writeback component */
> > + if (vkmsdev->config->writeback) {
> > + writeback = vkms_enable_writeback_connector(vkmsdev, crtc);
> > + if (writeback)
> > + DRM_ERROR("Failed to init writeback connector\n");
> > + }
> > +
> > + drm_mode_config_reset(dev);
> > +
> > + return 0;
> > +}
> > +
> > static int vkms_modeset_init(struct vkms_device *vkmsdev)
> > {
> > struct drm_device *dev = &vkmsdev->drm;
> > diff --git a/drivers/gpu/drm/vkms/vkms_drv.h b/drivers/gpu/drm/vkms/vkms_drv.h
> > index 2c9d1f20ce84..08d0ef106e37 100644
> > --- a/drivers/gpu/drm/vkms/vkms_drv.h
> > +++ b/drivers/gpu/drm/vkms/vkms_drv.h
> > @@ -25,35 +25,6 @@
> >
> > #define VKMS_LUT_SIZE 256
> >
> > -/**
> > - * struct vkms_output - Internal representation of all output components in vkms
> > - *
> > - * @crtc: Base crtc in drm
> > - * @encoder: DRM encoder used for this output
> > - * @connector: DRM connector used for this output
> > - * @wb_connecter: DRM writeback connector used for this output
> > - * @vblank_hrtimer:
> > - * @period_ns:
> > - * @composer_workq: Ordered workqueue for composer_work
> > - * @lock: Lock used to project concurrent acces to the composer
> > - * @composer_enabled: Protected by @lock.
> > - * @composer_state:
> > - * @composer_lock: Lock used internally to protect @composer_state members
> > - */
> > -struct vkms_output {
> > - struct drm_crtc crtc;
> > - struct drm_writeback_connector wb_connector;
> > - struct hrtimer vblank_hrtimer;
> > - ktime_t period_ns;
> > - struct workqueue_struct *composer_workq;
> > - spinlock_t lock;
> > -
> > - bool composer_enabled;
> > - struct vkms_crtc_state *composer_state;
> > -
> > - spinlock_t composer_lock;
> > -};
> > -
> > /**
> > * struct vkms_config - General configuration for VKMS driver
> > *
> > @@ -80,7 +51,6 @@ struct vkms_config {
> > struct vkms_device {
> > struct drm_device drm;
> > struct platform_device *platform;
> > - struct vkms_output output;
> > const struct vkms_config *config;
> > };
> >
> > @@ -88,20 +58,7 @@ struct vkms_device {
> > * The following helpers are used to convert a member of a struct into its parent.
> > */
> >
> > -#define drm_crtc_to_vkms_output(target) \
> > - container_of(target, struct vkms_output, crtc)
> > -
> > #define drm_device_to_vkms_device(target) \
> > container_of(target, struct vkms_device, drm)
> >
> > -/**
> > - * vkms_output_init() - Initialize all sub-components needed for a vkms device.
> > - *
> > - * @vkmsdev: vkms device to initialize
> > - * @possible_crtc_index: Crtc which can be attached to the planes. The caller must ensure that
> > - * possible_crtc_index is positive and less or equals to 31.
> > - */
> > -
> > -int vkms_output_init(struct vkms_device *vkmsdev, int possible_crtc_index);
> > -
> > #endif /* _VKMS_DRV_H_ */
> > diff --git a/drivers/gpu/drm/vkms/vkms_output.c b/drivers/gpu/drm/vkms/vkms_output.c
> > deleted file mode 100644
> > index cb8507917b5f..000000000000
> > --- a/drivers/gpu/drm/vkms/vkms_output.c
> > +++ /dev/null
> > @@ -1,135 +0,0 @@
> > -// SPDX-License-Identifier: GPL-2.0+
> > -
> > -#include <drm/drm_atomic_helper.h>
> > -#include <drm/drm_edid.h>
> > -#include <drm/drm_probe_helper.h>
> > -#include <drm/drm_managed.h>
> > -
> > -#include "vkms_writeback.h"
> > -#include "vkms_plane.h"
> > -#include "vkms_crtc.h"
> > -
> > -static const struct drm_connector_funcs vkms_connector_funcs = {
> > - .fill_modes = drm_helper_probe_single_connector_modes,
> > - .reset = drm_atomic_helper_connector_reset,
> > - .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
> > - .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
> > -};
> > -
> > -static const struct drm_encoder_funcs vkms_encoder_funcs = {};
> > -
> > -static int vkms_conn_get_modes(struct drm_connector *connector)
> > -{
> > - int count;
> > -
> > - /* Use the default modes list from drm */
> > - count = drm_add_modes_noedid(connector, XRES_MAX, YRES_MAX);
> > - drm_set_preferred_mode(connector, XRES_DEF, YRES_DEF);
> > -
> > - return count;
> > -}
> > -
> > -static const struct drm_connector_helper_funcs vkms_conn_helper_funcs = {
> > - .get_modes = vkms_conn_get_modes,
> > -};
> > -
> > -static int vkms_add_overlay_plane(struct vkms_device *vkmsdev, int possible_crtc_index,
> > - struct drm_crtc *crtc)
> > -{
> > - struct vkms_plane *overlay;
> > -
> > - overlay = vkms_plane_init(vkmsdev, DRM_PLANE_TYPE_OVERLAY, possible_crtc_index);
> > - if (IS_ERR(overlay))
> > - return PTR_ERR(overlay);
> > -
> > - if (!overlay->base.possible_crtcs)
> > - overlay->base.possible_crtcs = drm_crtc_mask(crtc);
> > -
> > - return 0;
> > -}
> > -
> > -int vkms_output_init(struct vkms_device *vkmsdev, int possible_crtc_index)
> > -{
> > - struct vkms_output *output = &vkmsdev->output;
> > - struct drm_device *dev = &vkmsdev->drm;
> > - struct drm_connector *connector;
> > - struct drm_encoder *encoder;
> > - struct drm_crtc *crtc = &output->crtc;
> > - struct vkms_plane *primary, *cursor = NULL;
> > - int ret;
> > - int writeback;
> > - unsigned int n;
> > -
> > - /*
> > - * Initialize used plane. One primary plane is required to perform the composition.
> > - *
> > - * The overlay and cursor planes are not mandatory, but can be used to perform complex
> > - * composition.
> > - */
> > - primary = vkms_plane_init(vkmsdev, DRM_PLANE_TYPE_PRIMARY, possible_crtc_index);
> > - 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, possible_crtc_index, crtc);
> > - if (ret)
> > - return ret;
> > - }
> > - }
> > -
> > - if (vkmsdev->config->cursor) {
> > - cursor = vkms_plane_init(vkmsdev, DRM_PLANE_TYPE_CURSOR, possible_crtc_index);
> > - if (IS_ERR(cursor))
> > - return PTR_ERR(cursor);
> > - }
> > -
> > - ret = vkms_crtc_init(dev, crtc, &primary->base, &cursor->base);
> > - if (ret)
> > - return ret;
> > -
> > - connector = drmm_kzalloc(&vkmsdev->drm, sizeof(*connector), GFP_KERNEL);
> > - if (!connector)
> > - return -ENOMEM;
> > -
> > - ret = drmm_connector_init(dev, connector, &vkms_connector_funcs,
> > - DRM_MODE_CONNECTOR_VIRTUAL, NULL);
> > - if (ret) {
> > - DRM_ERROR("Failed to init connector\n");
> > - return ret;
> > - }
> > -
> > - drm_connector_helper_add(connector, &vkms_conn_helper_funcs);
> > -
> > - encoder = drmm_kzalloc(&vkmsdev->drm, sizeof(*encoder), GFP_KERNEL);
> > - if (!encoder)
> > - return -ENOMEM;
> > -
> > - ret = drmm_encoder_init(dev, encoder, &vkms_encoder_funcs,
> > - DRM_MODE_ENCODER_VIRTUAL, NULL);
> > - if (ret) {
> > - DRM_ERROR("Failed to init encoder\n");
> > - return ret;
> > - }
> > - /*
> > - * This is an hardcoded value to select crtc for the encoder.
> > - * 1 here designate the first registered CRTC, the one allocated in [1]
> > - */
> > - encoder->possible_crtcs = 1;
> > -
> > - ret = drm_connector_attach_encoder(connector, encoder);
> > - if (ret) {
> > - DRM_ERROR("Failed to attach connector to encoder\n");
> > - return ret;
> > - }
> > -
> > - if (vkmsdev->config->writeback) {
> > - writeback = vkms_enable_writeback_connector(vkmsdev);
> > - if (writeback)
> > - DRM_ERROR("Failed to init writeback connector\n");
> > - }
> > -
> > - drm_mode_config_reset(dev);
> > -
> > - return 0;
> > -}
> > diff --git a/drivers/gpu/drm/vkms/vkms_writeback.c b/drivers/gpu/drm/vkms/vkms_writeback.c
> > index 5e75880a5845..322e247979b2 100644
> > --- a/drivers/gpu/drm/vkms/vkms_writeback.c
> > +++ b/drivers/gpu/drm/vkms/vkms_writeback.c
> > @@ -110,7 +110,7 @@ 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;
> > @@ -119,8 +119,7 @@ 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);
> > }
> >
> > @@ -129,10 +128,8 @@ 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 vkms_crtc *output = drm_crtc_to_vkms_crtc(connector_state->crtc);
> > 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 drm_framebuffer *fb = connector_state->writeback_job->fb;
> > u16 crtc_height = crtc_state->base.crtc->mode.vdisplay;
> > @@ -141,12 +138,12 @@ 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(output, 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);
> > @@ -167,9 +164,10 @@ static const struct drm_connector_helper_funcs vkms_wb_conn_helper_funcs = {
> > .atomic_check = vkms_wb_atomic_check,
> > };
> >
> > -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);
> >
> > diff --git a/drivers/gpu/drm/vkms/vkms_writeback.h b/drivers/gpu/drm/vkms/vkms_writeback.h
> > index 44dff15faff6..39613a2408be 100644
> > --- a/drivers/gpu/drm/vkms/vkms_writeback.h
> > +++ b/drivers/gpu/drm/vkms/vkms_writeback.h
> > @@ -16,6 +16,6 @@ struct vkms_writeback_job {
> > };
> >
> > /* 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_WRITEBACK_H
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