On Thu, Oct 9, 2025 at 3:31 PM Thomas Zimmermann <[email protected]> wrote: > > Add free callback to struct drm_client_funcs. Invoke function to > free the client memory as part of the release process. Implement > free for fbdev emulation. > > Fbdev emulation allocates and prepares client memory in > drm_fbdev_client_setup(). The release happens in fb_destroy from > struct fb_ops. Multiple implementations of this callback exist in > the various drivers that provide fbdev implementation. Each of them > needs to follow the implementation details of the fbdev setup code. > > Adding a free callback for the client puts the unprepare and release > of the fbdev client in a single place. > > Signed-off-by: Thomas Zimmermann <[email protected]>
For gma500: Acked-by: Patrik Jakobsson <[email protected]> > --- > drivers/gpu/drm/armada/armada_fbdev.c | 2 -- > drivers/gpu/drm/clients/drm_fbdev_client.c | 17 +++++++++++++++-- > drivers/gpu/drm/drm_client.c | 4 ++++ > drivers/gpu/drm/drm_fbdev_dma.c | 4 ---- > drivers/gpu/drm/drm_fbdev_shmem.c | 2 -- > drivers/gpu/drm/drm_fbdev_ttm.c | 2 -- > drivers/gpu/drm/exynos/exynos_drm_fbdev.c | 2 -- > drivers/gpu/drm/gma500/fbdev.c | 3 --- > drivers/gpu/drm/i915/display/intel_fbdev.c | 2 -- > drivers/gpu/drm/msm/msm_fbdev.c | 2 -- > drivers/gpu/drm/omapdrm/omap_fbdev.c | 2 -- > drivers/gpu/drm/radeon/radeon_fbdev.c | 2 -- > drivers/gpu/drm/tegra/fbdev.c | 2 -- > include/drm/drm_client.h | 10 ++++++++++ > 14 files changed, 29 insertions(+), 27 deletions(-) > > diff --git a/drivers/gpu/drm/armada/armada_fbdev.c > b/drivers/gpu/drm/armada/armada_fbdev.c > index cb53cc91bafb..22e2081bfa04 100644 > --- a/drivers/gpu/drm/armada/armada_fbdev.c > +++ b/drivers/gpu/drm/armada/armada_fbdev.c > @@ -28,8 +28,6 @@ static void armada_fbdev_fb_destroy(struct fb_info *info) > fbh->fb->funcs->destroy(fbh->fb); > > drm_client_release(&fbh->client); > - drm_fb_helper_unprepare(fbh); > - kfree(fbh); > } > > static const struct fb_ops armada_fb_ops = { > diff --git a/drivers/gpu/drm/clients/drm_fbdev_client.c > b/drivers/gpu/drm/clients/drm_fbdev_client.c > index f894ba52bdb5..5336accab1b6 100644 > --- a/drivers/gpu/drm/clients/drm_fbdev_client.c > +++ b/drivers/gpu/drm/clients/drm_fbdev_client.c > @@ -13,16 +13,28 @@ > * struct drm_client_funcs > */ > > +static void drm_fbdev_client_free(struct drm_client_dev *client) > +{ > + struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client); > + > + drm_fb_helper_unprepare(fb_helper); > + kfree(fb_helper); > +} > + > static void drm_fbdev_client_unregister(struct drm_client_dev *client) > { > struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client); > > if (fb_helper->info) { > + /* > + * Fully probed framebuffer device > + */ > drm_fb_helper_unregister_info(fb_helper); > } else { > + /* > + * Partially initialized client, no framebuffer device yet > + */ > drm_client_release(&fb_helper->client); > - drm_fb_helper_unprepare(fb_helper); > - kfree(fb_helper); > } > } > > @@ -88,6 +100,7 @@ static int drm_fbdev_client_resume(struct drm_client_dev > *client, bool holds_con > > static const struct drm_client_funcs drm_fbdev_client_funcs = { > .owner = THIS_MODULE, > + .free = drm_fbdev_client_free, > .unregister = drm_fbdev_client_unregister, > .restore = drm_fbdev_client_restore, > .hotplug = drm_fbdev_client_hotplug, > diff --git a/drivers/gpu/drm/drm_client.c b/drivers/gpu/drm/drm_client.c > index 3fa38d4ac70b..fe9c6d7083ea 100644 > --- a/drivers/gpu/drm/drm_client.c > +++ b/drivers/gpu/drm/drm_client.c > @@ -168,6 +168,10 @@ void drm_client_release(struct drm_client_dev *client) > > drm_client_modeset_free(client); > drm_client_close(client); > + > + if (client->funcs && client->funcs->free) > + client->funcs->free(client); > + > drm_dev_put(dev); > } > EXPORT_SYMBOL(drm_client_release); > diff --git a/drivers/gpu/drm/drm_fbdev_dma.c b/drivers/gpu/drm/drm_fbdev_dma.c > index 8bd626ef16c7..c6196293e424 100644 > --- a/drivers/gpu/drm/drm_fbdev_dma.c > +++ b/drivers/gpu/drm/drm_fbdev_dma.c > @@ -57,8 +57,6 @@ static void drm_fbdev_dma_fb_destroy(struct fb_info *info) > drm_client_buffer_vunmap(fb_helper->buffer); > drm_client_framebuffer_delete(fb_helper->buffer); > drm_client_release(&fb_helper->client); > - drm_fb_helper_unprepare(fb_helper); > - kfree(fb_helper); > } > > static const struct fb_ops drm_fbdev_dma_fb_ops = { > @@ -92,8 +90,6 @@ static void drm_fbdev_dma_shadowed_fb_destroy(struct > fb_info *info) > drm_client_buffer_vunmap(fb_helper->buffer); > drm_client_framebuffer_delete(fb_helper->buffer); > drm_client_release(&fb_helper->client); > - drm_fb_helper_unprepare(fb_helper); > - kfree(fb_helper); > } > > static const struct fb_ops drm_fbdev_dma_shadowed_fb_ops = { > diff --git a/drivers/gpu/drm/drm_fbdev_shmem.c > b/drivers/gpu/drm/drm_fbdev_shmem.c > index 1e827bf8b815..51573058df6f 100644 > --- a/drivers/gpu/drm/drm_fbdev_shmem.c > +++ b/drivers/gpu/drm/drm_fbdev_shmem.c > @@ -65,8 +65,6 @@ static void drm_fbdev_shmem_fb_destroy(struct fb_info *info) > drm_client_buffer_vunmap(fb_helper->buffer); > drm_client_framebuffer_delete(fb_helper->buffer); > drm_client_release(&fb_helper->client); > - drm_fb_helper_unprepare(fb_helper); > - kfree(fb_helper); > } > > static const struct fb_ops drm_fbdev_shmem_fb_ops = { > diff --git a/drivers/gpu/drm/drm_fbdev_ttm.c b/drivers/gpu/drm/drm_fbdev_ttm.c > index 85feb55bba11..ccf460fbc1f0 100644 > --- a/drivers/gpu/drm/drm_fbdev_ttm.c > +++ b/drivers/gpu/drm/drm_fbdev_ttm.c > @@ -53,8 +53,6 @@ static void drm_fbdev_ttm_fb_destroy(struct fb_info *info) > drm_client_framebuffer_delete(fb_helper->buffer); > > drm_client_release(&fb_helper->client); > - drm_fb_helper_unprepare(fb_helper); > - kfree(fb_helper); > } > > static const struct fb_ops drm_fbdev_ttm_fb_ops = { > diff --git a/drivers/gpu/drm/exynos/exynos_drm_fbdev.c > b/drivers/gpu/drm/exynos/exynos_drm_fbdev.c > index 93de25b77e68..a3bd21a827ad 100644 > --- a/drivers/gpu/drm/exynos/exynos_drm_fbdev.c > +++ b/drivers/gpu/drm/exynos/exynos_drm_fbdev.c > @@ -42,8 +42,6 @@ static void exynos_drm_fb_destroy(struct fb_info *info) > drm_framebuffer_remove(fb); > > drm_client_release(&fb_helper->client); > - drm_fb_helper_unprepare(fb_helper); > - kfree(fb_helper); > } > > static const struct fb_ops exynos_drm_fb_ops = { > diff --git a/drivers/gpu/drm/gma500/fbdev.c b/drivers/gpu/drm/gma500/fbdev.c > index a6af21514cff..bc92fa24a1e2 100644 > --- a/drivers/gpu/drm/gma500/fbdev.c > +++ b/drivers/gpu/drm/gma500/fbdev.c > @@ -84,9 +84,6 @@ static void psb_fbdev_fb_destroy(struct fb_info *info) > drm_gem_object_put(obj); > > drm_client_release(&fb_helper->client); > - > - drm_fb_helper_unprepare(fb_helper); > - kfree(fb_helper); > } > > static const struct fb_ops psb_fbdev_fb_ops = { > diff --git a/drivers/gpu/drm/i915/display/intel_fbdev.c > b/drivers/gpu/drm/i915/display/intel_fbdev.c > index 3fbdf75415cc..d5f26c8bb102 100644 > --- a/drivers/gpu/drm/i915/display/intel_fbdev.c > +++ b/drivers/gpu/drm/i915/display/intel_fbdev.c > @@ -146,8 +146,6 @@ static void intel_fbdev_fb_destroy(struct fb_info *info) > drm_framebuffer_remove(fb_helper->fb); > > drm_client_release(&fb_helper->client); > - drm_fb_helper_unprepare(fb_helper); > - kfree(fb_helper); > } > > __diag_push(); > diff --git a/drivers/gpu/drm/msm/msm_fbdev.c b/drivers/gpu/drm/msm/msm_fbdev.c > index b5969374d53f..aad6fb77f0de 100644 > --- a/drivers/gpu/drm/msm/msm_fbdev.c > +++ b/drivers/gpu/drm/msm/msm_fbdev.c > @@ -52,8 +52,6 @@ static void msm_fbdev_fb_destroy(struct fb_info *info) > drm_framebuffer_remove(fb); > > drm_client_release(&helper->client); > - drm_fb_helper_unprepare(helper); > - kfree(helper); > } > > static const struct fb_ops msm_fb_ops = { > diff --git a/drivers/gpu/drm/omapdrm/omap_fbdev.c > b/drivers/gpu/drm/omapdrm/omap_fbdev.c > index 948af7ec1130..b5df2923d2a6 100644 > --- a/drivers/gpu/drm/omapdrm/omap_fbdev.c > +++ b/drivers/gpu/drm/omapdrm/omap_fbdev.c > @@ -103,8 +103,6 @@ static void omap_fbdev_fb_destroy(struct fb_info *info) > drm_framebuffer_remove(fb); > > drm_client_release(&helper->client); > - drm_fb_helper_unprepare(helper); > - kfree(helper); > } > > /* > diff --git a/drivers/gpu/drm/radeon/radeon_fbdev.c > b/drivers/gpu/drm/radeon/radeon_fbdev.c > index dc81b0c2dbff..4df6c9167bf0 100644 > --- a/drivers/gpu/drm/radeon/radeon_fbdev.c > +++ b/drivers/gpu/drm/radeon/radeon_fbdev.c > @@ -184,8 +184,6 @@ static void radeon_fbdev_fb_destroy(struct fb_info *info) > radeon_fbdev_destroy_pinned_object(gobj); > > drm_client_release(&fb_helper->client); > - drm_fb_helper_unprepare(fb_helper); > - kfree(fb_helper); > } > > static const struct fb_ops radeon_fbdev_fb_ops = { > diff --git a/drivers/gpu/drm/tegra/fbdev.c b/drivers/gpu/drm/tegra/fbdev.c > index 1b70f5e164af..91aece6f34e0 100644 > --- a/drivers/gpu/drm/tegra/fbdev.c > +++ b/drivers/gpu/drm/tegra/fbdev.c > @@ -53,8 +53,6 @@ static void tegra_fbdev_fb_destroy(struct fb_info *info) > drm_framebuffer_remove(fb); > > drm_client_release(&helper->client); > - drm_fb_helper_unprepare(helper); > - kfree(helper); > } > > static const struct fb_ops tegra_fb_ops = { > diff --git a/include/drm/drm_client.h b/include/drm/drm_client.h > index bdd845e383ef..eecb8d6e15c7 100644 > --- a/include/drm/drm_client.h > +++ b/include/drm/drm_client.h > @@ -28,6 +28,16 @@ struct drm_client_funcs { > */ > struct module *owner; > > + /** > + * @free: > + * > + * Called when the client gets unregistered. Implementations should > + * release all client-specific data and free the memory. > + * > + * This callback is optional. > + */ > + void (*free)(struct drm_client_dev *client); > + > /** > * @unregister: > * > -- > 2.51.0 >
