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Message-ID: <20241031184336.3866-1-jose.exposito89@gmail.com>
Date: Thu, 31 Oct 2024 19:43:35 +0100
From: José Expósito <jose.exposito89@...il.com>
To: louis.chauvet@...tlin.com
Cc: airlied@...il.com,
dri-devel@...ts.freedesktop.org,
hamohammed.sa@...il.com,
linux-kernel@...r.kernel.org,
maarten.lankhorst@...ux.intel.com,
mairacanal@...eup.net,
melissa.srw@...il.com,
mripard@...nel.org,
rodrigosiqueiramelo@...il.com,
simona.vetter@...ll.ch,
simona@...ll.ch,
thomas.petazzoni@...tlin.com,
tzimmermann@...e.de
Subject: Re: [PATCH v2] drm/vkms: Remove index parameter from init_vkms_output
> On 26/10/24 - 12:22, Maíra Canal wrote:
> > Hi Louis,
> >
> > On 10/10/24 14:27, Louis Chauvet wrote:
> > > VKMS currently supports only one CRTC, so it make no sense to have this
> > > index configurable. To avoid issues, replace this hardcoded index by
> > > drm_crtc_mask when applicable.
> > >
> > > There is no need to manually set a crtc mask on primary and cursor plane
> > > as it is automatically set by drmm_crtc_alloc_with_planes.
> > >
> > > In addition, this will remove the use of an uninitialized structure in
> > > vkms_add_overlay_plane. This currently works by chance because two things:
> > > - vkms_plane_init always set a possible_crtcs value, so the problematic
> > > branch is never used;
> > > - drm_crtc_mask on an kzalloc'd drm_crtc returns BIT(0), and the VKMS CRTC
> > > always have this id.
> > >
> > > Signed-off-by: Louis Chauvet <louis.chauvet@...tlin.com>
> > > ---
> > > Changes in v2:
> > > - Applied comments from José
> > > - Link to v1: https://lore.kernel.org/r/20240906-vkms-remove-index-v1-1-3cfedd8ccb2f@bootlin.com
> > > ---
> > > drivers/gpu/drm/vkms/vkms_drv.c | 2 +-
> > > drivers/gpu/drm/vkms/vkms_drv.h | 8 ++----
> > > drivers/gpu/drm/vkms/vkms_output.c | 54 ++++++++++++++------------------------
> > > drivers/gpu/drm/vkms/vkms_plane.c | 4 +--
> > > 4 files changed, 24 insertions(+), 44 deletions(-)
> > >
> > > diff --git a/drivers/gpu/drm/vkms/vkms_drv.c b/drivers/gpu/drm/vkms/vkms_drv.c
> > > index 2d1e95cb66e5..0f6805b9fe7b 100644
> > > --- a/drivers/gpu/drm/vkms/vkms_drv.c
> > > +++ b/drivers/gpu/drm/vkms/vkms_drv.c
> > > @@ -174,7 +174,7 @@ static int vkms_modeset_init(struct vkms_device *vkmsdev)
> > > dev->mode_config.preferred_depth = 0;
> > > dev->mode_config.helper_private = &vkms_mode_config_helpers;
> > > - return vkms_output_init(vkmsdev, 0);
> > > + return vkms_output_init(vkmsdev);
> > > }
> > > static int vkms_create(struct vkms_config *config)
> > > diff --git a/drivers/gpu/drm/vkms/vkms_drv.h b/drivers/gpu/drm/vkms/vkms_drv.h
> > > index 672fe191e239..036101ee4ea1 100644
> > > --- a/drivers/gpu/drm/vkms/vkms_drv.h
> > > +++ b/drivers/gpu/drm/vkms/vkms_drv.h
> > > @@ -212,21 +212,17 @@ int vkms_crtc_init(struct drm_device *dev, struct drm_crtc *crtc,
> > > * vkms_output_init() - Initialize all sub-components needed for a VKMS device.
> > > *
> > > * @vkmsdev: VKMS device to initialize
> > > - * @index: CRTC which can be attached to the planes. The caller must ensure that
> > > - * @index is positive and less or equals to 31.
> > > */
> > > -int vkms_output_init(struct vkms_device *vkmsdev, int index);
> > > +int vkms_output_init(struct vkms_device *vkmsdev);
> > > /**
> > > * vkms_plane_init() - Initialize a plane
> > > *
> > > * @vkmsdev: VKMS device containing the plane
> > > * @type: type of plane to initialize
> > > - * @index: CRTC which can be attached to the plane. The caller must ensure that
> > > - * @index is positive and less or equals to 31.
> > > */
> > > 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,
> > > diff --git a/drivers/gpu/drm/vkms/vkms_output.c b/drivers/gpu/drm/vkms/vkms_output.c
> > > index 0a5a185aa0b0..5128aa3b2eb6 100644
> > > --- a/drivers/gpu/drm/vkms/vkms_output.c
> > > +++ b/drivers/gpu/drm/vkms/vkms_output.c
> > > @@ -32,29 +32,14 @@ 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 index,
> > > - struct drm_crtc *crtc)
> > > -{
> > > - struct vkms_plane *overlay;
> > > -
> > > - overlay = vkms_plane_init(vkmsdev, DRM_PLANE_TYPE_OVERLAY, 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 index)
> > > +int vkms_output_init(struct vkms_device *vkmsdev)
> > > {
> > > 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 vkms_plane *primary, *cursor = NULL;
> > > + struct vkms_plane *primary, *overlay, *cursor = NULL;
> > > int ret;
> > > int writeback;
> > > unsigned int n;
> > > @@ -65,34 +50,37 @@ int vkms_output_init(struct vkms_device *vkmsdev, int index)
> > > * 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, 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;
> > > - }
> > > - }
> > > -
> > > if (vkmsdev->config->cursor) {
> > > - cursor = vkms_plane_init(vkmsdev, DRM_PLANE_TYPE_CURSOR, index);
> > > + cursor = vkms_plane_init(vkmsdev, DRM_PLANE_TYPE_CURSOR);
> > > if (IS_ERR(cursor))
> > > return PTR_ERR(cursor);
> > > }
> > > - /* [1]: Allocation of a CRTC, its index will be BIT(0) = 1 */
> > > ret = vkms_crtc_init(dev, crtc, &primary->base, &cursor->base);
> > > if (ret)
> > > return ret;
> > > + if (vkmsdev->config->overlay) {
> > > + for (n = 0; n < NUM_OVERLAY_PLANES; n++) {
> > > + overlay = vkms_plane_init(vkmsdev, DRM_PLANE_TYPE_OVERLAY);
> > > + if (IS_ERR(overlay)) {
> > > + DRM_DEV_ERROR(dev->dev, "Failed to init vkms plane\n");
> > > + ret = PTR_ERR(overlay);
> > > + goto err_crtc;
> > > + }
> > > + overlay->base.possible_crtcs = drm_crtc_mask(crtc);
> > > + }
> > > + }
> > > +
> > > ret = drm_connector_init(dev, connector, &vkms_connector_funcs,
> > > DRM_MODE_CONNECTOR_VIRTUAL);
> > > if (ret) {
> > > DRM_ERROR("Failed to init connector\n");
> > > - goto err_connector;
> > > + goto err_crtc;
> > > }
> > > drm_connector_helper_add(connector, &vkms_conn_helper_funcs);
> > > @@ -103,11 +91,7 @@ int vkms_output_init(struct vkms_device *vkmsdev, int index)
> > > DRM_ERROR("Failed to init encoder\n");
> > > goto err_encoder;
> > > }
> > > - /*
> > > - * This is a hardcoded value to select crtc for the encoder.
> > > - * BIT(0) here designate the first registered CRTC, the one allocated in [1]
> > > - */
> > > - encoder->possible_crtcs = BIT(0);
> > > + encoder->possible_crtcs = drm_crtc_mask(crtc);
> > > ret = drm_connector_attach_encoder(connector, encoder);
> > > if (ret) {
> > > @@ -131,7 +115,7 @@ int vkms_output_init(struct vkms_device *vkmsdev, int index)
> > > err_encoder:
> > > drm_connector_cleanup(connector);
> > > -err_connector:
> > > +err_crtc:
> > > drm_crtc_cleanup(crtc);
> >
> > Do we really need `drm_crtc_cleanup`? We are allocating the CRTC with
> > `drmm_crtc_init_with_planes`.
>
> I agree, I'll check the previous discussions I've had on the mailing list,
> I have a little doubt that someone asked me to re-add this cleaning at
> some point.
Oh! Good point. It looks like drm_crtc_cleanup() is a leftover from
commit 99cc528ebe92 ("drm/vkms: Use drmm_crtc_init_with_planes()").
Since the previous code in vkms_output.c was calling drm_crtc_cleanup()
I assumed it was required. But Maíra is right, it is safe to drop it.
I sent a simple patch dropping the call to drm_crtc_cleanup():
https://lore.kernel.org/dri-devel/20241031183835.3633-1-jose.exposito89@gmail.com/T/#u
About this patch, LGTM.
Jose
> Thanks,
> Louis Chauvet
>
> > The rest looks fine to me.
> >
> > Best Regards,
> > - Maíra
> >
> > > return ret;
> > > diff --git a/drivers/gpu/drm/vkms/vkms_plane.c b/drivers/gpu/drm/vkms/vkms_plane.c
> > > index e5c625ab8e3e..ad137c9a75f5 100644
> > > --- a/drivers/gpu/drm/vkms/vkms_plane.c
> > > +++ b/drivers/gpu/drm/vkms/vkms_plane.c
> > > @@ -198,12 +198,12 @@ 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_plane *plane;
> > > - plane = drmm_universal_plane_alloc(dev, struct vkms_plane, base, 1 << index,
> > > + plane = drmm_universal_plane_alloc(dev, struct vkms_plane, base, 0,
> > > &vkms_plane_funcs,
> > > vkms_formats, ARRAY_SIZE(vkms_formats),
> > > NULL, type, NULL);
> > >
> > > ---
> > > base-commit: 33c255312660653cf54f8019896b5dca28e3c580
> > > change-id: 20240906-vkms-remove-index-3a6e04c38e02
> > >
> > > Best regards,
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