[PATCH 1/3] drm/amdgpu: create amdgpu_vkms (v2)
Alex Deucher
alexdeucher at gmail.com
Mon Jul 26 16:21:04 UTC 2021
On Fri, Jul 23, 2021 at 10:07 PM Chen, Guchun <Guchun.Chen at amd.com> wrote:
>
> [Public]
>
> Look copy right statement is missed in both amdgpu_vkms.c and amdgpu_vkms.h.
It's there, it just uses the newer SPDX license identifier.
Alex
>
> Regards,
> Guchun
>
> -----Original Message-----
> From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> On Behalf Of Alex Deucher
> Sent: Friday, July 23, 2021 10:32 PM
> To: Taylor, Ryan <Ryan.Taylor at amd.com>
> Cc: kernel test robot <lkp at intel.com>; Daniel Vetter <daniel.vetter at ffwll.ch>; Siqueira, Rodrigo <Rodrigo.Siqueira at amd.com>; amd-gfx list <amd-gfx at lists.freedesktop.org>; Melissa Wen <melissa.srw at gmail.com>; Maling list - DRI developers <dri-devel at lists.freedesktop.org>
> Subject: Re: [PATCH 1/3] drm/amdgpu: create amdgpu_vkms (v2)
>
> On Wed, Jul 21, 2021 at 1:07 PM Ryan Taylor <Ryan.Taylor at amd.com> wrote:
> >
> > Modify the VKMS driver into an api that dce_virtual can use to create
> > virtual displays that obey drm's atomic modesetting api.
> >
> > v2: Made local functions static.
> >
> > Reported-by: kernel test robot <lkp at intel.com>
> > Signed-off-by: Ryan Taylor <Ryan.Taylor at amd.com>
> > ---
> > drivers/gpu/drm/amd/amdgpu/Makefile | 1 +
> > drivers/gpu/drm/amd/amdgpu/amdgpu.h | 1 +
> > drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 2 +-
> > drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c | 2 +-
> > drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c | 411
> > +++++++++++++++++++++++ drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.h |
> > 29 ++ drivers/gpu/drm/amd/amdgpu/dce_virtual.c | 23 +-
> > 7 files changed, 458 insertions(+), 11 deletions(-) create mode
> > 100644 drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c
> > create mode 100644 drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.h
> >
> > diff --git a/drivers/gpu/drm/amd/amdgpu/Makefile
> > b/drivers/gpu/drm/amd/amdgpu/Makefile
> > index f089794bbdd5..30cbcd5ce1cc 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/Makefile
> > +++ b/drivers/gpu/drm/amd/amdgpu/Makefile
> > @@ -120,6 +120,7 @@ amdgpu-y += \
> > amdgpu-y += \
> > dce_v10_0.o \
> > dce_v11_0.o \
> > + amdgpu_vkms.o \
> > dce_virtual.o
> >
> > # add GFX block
> > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> > b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> > index 54cf647bd018..d0a2f2ed433d 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> > @@ -919,6 +919,7 @@ struct amdgpu_device {
> >
> > /* display */
> > bool enable_virtual_display;
> > + struct amdgpu_vkms_output *amdgpu_vkms_output;
> > struct amdgpu_mode_info mode_info;
> > /* For pre-DCE11. DCE11 and later are in "struct amdgpu_device->dm" */
> > struct work_struct hotplug_work;
> > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> > b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> > index d0c935cf4f0f..1b016e5bc75f 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> > @@ -1230,7 +1230,7 @@ static int amdgpu_pci_probe(struct pci_dev *pdev,
> > int ret, retry = 0;
> > bool supports_atomic = false;
> >
> > - if (!amdgpu_virtual_display &&
> > + if (amdgpu_virtual_display ||
> > amdgpu_device_asic_has_dc_support(flags & AMD_ASIC_MASK))
> > supports_atomic = true;
> >
> > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c
> > b/drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c
> > index 09b048647523..5a143ca02cf9 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c
> > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c
> > @@ -344,7 +344,7 @@ int amdgpu_fbdev_init(struct amdgpu_device *adev)
> > }
> >
> > /* disable all the possible outputs/crtcs before entering KMS mode */
> > - if (!amdgpu_device_has_dc_support(adev))
> > + if (!amdgpu_device_has_dc_support(adev) &&
> > + !amdgpu_virtual_display)
> >
> > drm_helper_disable_unused_functions(adev_to_drm(adev));
> >
> > drm_fb_helper_initial_config(&rfbdev->helper, bpp_sel); diff
> > --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c
> > b/drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c
> > new file mode 100644
> > index 000000000000..d5c1f1c58f5f
> > --- /dev/null
> > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c
> > @@ -0,0 +1,411 @@
> > +// SPDX-License-Identifier: GPL-2.0+
> > +
> > +#include <drm/drm_atomic_helper.h>
> > +#include <drm/drm_simple_kms_helper.h> #include <drm/drm_vblank.h>
> > +
> > +#include "amdgpu.h"
> > +#include "amdgpu_vkms.h"
> > +#include "amdgpu_display.h"
> > +
> > +/**
> > + * DOC: amdgpu_vkms
> > + *
> > + * The amdgpu vkms interface provides a virtual KMS interface for
> > +several use
> > + * cases: devices without display hardware, platforms where the
> > +actual display
> > + * hardware is not useful (e.g., servers), SR-IOV virtual functions,
> > +device
> > + * emulation/simulation, and device bring up prior to display
> > +hardware being
> > + * usable. We previously emulated a legacy KMS interface, but there
> > +was a desire
> > + * to move to the atomic KMS interface. The vkms driver did
> > +everything we
> > + * needed, but we wanted KMS support natively in the driver without
> > +buffer
> > + * sharing and the ability to support an instance of VKMS per device.
> > +We first
> > + * looked at splitting vkms into a stub driver and a helper module
> > +that other
> > + * drivers could use to implement a virtual display, but this
> > +strategy ended up
> > + * being messy due to driver specific callbacks needed for buffer management.
> > + * Ultimately, it proved easier to import the vkms code as it mostly
> > +used core
> > + * drm helpers anyway.
> > + */
> > +
> > +static const u32 amdgpu_vkms_formats[] = {
> > + DRM_FORMAT_XRGB8888,
> > +};
> > +
> > +static enum hrtimer_restart amdgpu_vkms_vblank_simulate(struct
> > +hrtimer *timer) {
> > + struct amdgpu_vkms_output *output = container_of(timer,
> > + struct amdgpu_vkms_output,
> > + vblank_hrtimer);
> > + struct drm_crtc *crtc = &output->crtc;
> > + u64 ret_overrun;
> > + bool ret;
> > +
> > + ret_overrun = hrtimer_forward_now(&output->vblank_hrtimer,
> > + output->period_ns);
> > + WARN_ON(ret_overrun != 1);
> > +
> > + ret = drm_crtc_handle_vblank(crtc);
> > + if (!ret)
> > + DRM_ERROR("amdgpu_vkms failure on handling vblank");
> > +
> > + return HRTIMER_RESTART;
> > +}
> > +
> > +static int amdgpu_vkms_enable_vblank(struct drm_crtc *crtc) {
> > + struct drm_device *dev = crtc->dev;
> > + unsigned int pipe = drm_crtc_index(crtc);
> > + struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
> > + struct amdgpu_vkms_output *out =
> > +drm_crtc_to_amdgpu_vkms_output(crtc);
> > +
> > + drm_calc_timestamping_constants(crtc, &crtc->mode);
> > +
> > + hrtimer_init(&out->vblank_hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
> > + out->vblank_hrtimer.function = &amdgpu_vkms_vblank_simulate;
> > + out->period_ns = ktime_set(0, vblank->framedur_ns);
> > + hrtimer_start(&out->vblank_hrtimer, out->period_ns,
> > + HRTIMER_MODE_REL);
> > +
> > + return 0;
> > +}
> > +
> > +static void amdgpu_vkms_disable_vblank(struct drm_crtc *crtc) {
> > + struct amdgpu_vkms_output *out =
> > +drm_crtc_to_amdgpu_vkms_output(crtc);
> > +
> > + hrtimer_cancel(&out->vblank_hrtimer);
> > +}
> > +
> > +static bool amdgpu_vkms_get_vblank_timestamp(struct drm_crtc *crtc,
> > + int *max_error,
> > + ktime_t *vblank_time,
> > + bool in_vblank_irq) {
> > + struct drm_device *dev = crtc->dev;
> > + unsigned int pipe = crtc->index;
> > + struct amdgpu_vkms_output *output = drm_crtc_to_amdgpu_vkms_output(crtc);
> > + struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
> > +
> > + if (!READ_ONCE(vblank->enabled)) {
> > + *vblank_time = ktime_get();
> > + return true;
> > + }
> > +
> > + *vblank_time = READ_ONCE(output->vblank_hrtimer.node.expires);
> > +
> > + if (WARN_ON(*vblank_time == vblank->time))
> > + return true;
> > +
> > + /*
> > + * To prevent races we roll the hrtimer forward before we do any
> > + * interrupt processing - this is how real hw works (the interrupt is
> > + * only generated after all the vblank registers are updated) and what
> > + * the vblank core expects. Therefore we need to always correct the
> > + * timestampe by one frame.
> > + */
> > + *vblank_time -= output->period_ns;
> > +
> > + return true;
> > +}
> > +
> > +static const struct drm_crtc_funcs amdgpu_vkms_crtc_funcs = {
> > + .set_config = drm_atomic_helper_set_config,
> > + .destroy = drm_crtc_cleanup,
> > + .page_flip = drm_atomic_helper_page_flip,
> > + .reset = drm_atomic_helper_crtc_reset,
> > + .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
> > + .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
> > + .enable_vblank = amdgpu_vkms_enable_vblank,
> > + .disable_vblank = amdgpu_vkms_disable_vblank,
> > + .get_vblank_timestamp = amdgpu_vkms_get_vblank_timestamp,
> > +};
> > +
> > +static void amdgpu_vkms_crtc_atomic_enable(struct drm_crtc *crtc,
> > + struct drm_atomic_state
> > +*state) {
> > + drm_crtc_vblank_on(crtc);
> > +}
> > +
> > +static void amdgpu_vkms_crtc_atomic_disable(struct drm_crtc *crtc,
> > + struct drm_atomic_state
> > +*state) {
> > + drm_crtc_vblank_off(crtc);
> > +}
> > +
> > +static void amdgpu_vkms_crtc_atomic_flush(struct drm_crtc *crtc,
> > + struct drm_atomic_state
> > +*state) {
> > + if (crtc->state->event) {
> > + spin_lock(&crtc->dev->event_lock);
> > +
> > + if (drm_crtc_vblank_get(crtc) != 0)
> > + drm_crtc_send_vblank_event(crtc, crtc->state->event);
> > + else
> > + drm_crtc_arm_vblank_event(crtc,
> > + crtc->state->event);
> > +
> > + spin_unlock(&crtc->dev->event_lock);
> > +
> > + crtc->state->event = NULL;
> > + }
> > +}
> > +
> > +static const struct drm_crtc_helper_funcs amdgpu_vkms_crtc_helper_funcs = {
> > + .atomic_flush = amdgpu_vkms_crtc_atomic_flush,
> > + .atomic_enable = amdgpu_vkms_crtc_atomic_enable,
> > + .atomic_disable = amdgpu_vkms_crtc_atomic_disable, };
> > +
> > +static int amdgpu_vkms_crtc_init(struct drm_device *dev, struct drm_crtc *crtc,
> > + struct drm_plane *primary, struct drm_plane
> > +*cursor) {
> > + int ret;
> > +
> > + ret = drm_crtc_init_with_planes(dev, crtc, primary, cursor,
> > + &amdgpu_vkms_crtc_funcs, NULL);
> > + if (ret) {
> > + DRM_ERROR("Failed to init CRTC\n");
> > + return ret;
> > + }
> > +
> > + drm_crtc_helper_add(crtc, &amdgpu_vkms_crtc_helper_funcs);
> > +
> > + return ret;
> > +}
> > +
> > +static const struct drm_connector_funcs amdgpu_vkms_connector_funcs = {
> > + .fill_modes = drm_helper_probe_single_connector_modes,
> > + .destroy = drm_connector_cleanup,
> > + .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 int amdgpu_vkms_conn_get_modes(struct drm_connector
> > +*connector) {
> > + int count;
> > +
> > + 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 amdgpu_vkms_conn_helper_funcs = {
> > + .get_modes = amdgpu_vkms_conn_get_modes,
> > +};
> > +
> > +static const struct drm_plane_funcs amdgpu_vkms_plane_funcs = {
> > + .update_plane = drm_atomic_helper_update_plane,
> > + .disable_plane = drm_atomic_helper_disable_plane,
> > + .destroy = drm_plane_cleanup,
> > + .reset = drm_atomic_helper_plane_reset,
> > + .atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
> > + .atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
> > +};
> > +
> > +static void amdgpu_vkms_plane_atomic_update(struct drm_plane *plane,
> > + struct drm_plane_state
> > +*old_state) {
> > + return;
> > +}
> > +
> > +static int amdgpu_vkms_plane_atomic_check(struct drm_plane *plane,
> > + struct drm_plane_state
> > +*state) {
> > + struct drm_crtc_state *crtc_state;
> > + bool can_position = false;
> > + int ret;
> > +
> > + if (!state->fb || WARN_ON(!state->crtc))
> > + return 0;
> > +
> > + crtc_state = drm_atomic_get_crtc_state(state->state, state->crtc);
> > + if (IS_ERR(crtc_state))
> > + return PTR_ERR(crtc_state);
> > +
> > + ret = drm_atomic_helper_check_plane_state(state, crtc_state,
> > + DRM_PLANE_HELPER_NO_SCALING,
> > + DRM_PLANE_HELPER_NO_SCALING,
> > + can_position, true);
> > + if (ret != 0)
> > + return ret;
> > +
> > + /* for now primary plane must be visible and full screen */
> > + if (!state->visible && !can_position)
> > + return -EINVAL;
> > +
> > + return 0;
> > +}
> > +
> > +static int amdgpu_vkms_prepare_fb(struct drm_plane *plane,
> > + struct drm_plane_state *new_state) {
> > + struct amdgpu_framebuffer *afb;
> > + struct drm_gem_object *obj;
> > + struct amdgpu_device *adev;
> > + struct amdgpu_bo *rbo;
> > + struct list_head list;
> > + struct ttm_validate_buffer tv;
> > + struct ww_acquire_ctx ticket;
> > + uint32_t domain;
> > + int r;
> > +
> > + if (!new_state->fb) {
> > + DRM_DEBUG_KMS("No FB bound\n");
> > + return 0;
> > + }
> > + afb = to_amdgpu_framebuffer(new_state->fb);
> > + obj = new_state->fb->obj[0];
> > + rbo = gem_to_amdgpu_bo(obj);
> > + adev = amdgpu_ttm_adev(rbo->tbo.bdev);
> > + INIT_LIST_HEAD(&list);
> > +
> > + tv.bo = &rbo->tbo;
> > + tv.num_shared = 1;
> > + list_add(&tv.head, &list);
> > +
> > + r = ttm_eu_reserve_buffers(&ticket, &list, false, NULL);
> > + if (r) {
> > + dev_err(adev->dev, "fail to reserve bo (%d)\n", r);
> > + return r;
> > + }
> > +
> > + if (plane->type != DRM_PLANE_TYPE_CURSOR)
> > + domain = amdgpu_display_supported_domains(adev, rbo->flags);
> > + else
> > + domain = AMDGPU_GEM_DOMAIN_VRAM;
> > +
> > + r = amdgpu_bo_pin(rbo, domain);
> > + if (unlikely(r != 0)) {
> > + if (r != -ERESTARTSYS)
> > + DRM_ERROR("Failed to pin framebuffer with error %d\n", r);
> > + ttm_eu_backoff_reservation(&ticket, &list);
> > + return r;
> > + }
> > +
> > + r = amdgpu_ttm_alloc_gart(&rbo->tbo);
> > + if (unlikely(r != 0)) {
> > + amdgpu_bo_unpin(rbo);
> > + ttm_eu_backoff_reservation(&ticket, &list);
> > + DRM_ERROR("%p bind failed\n", rbo);
> > + return r;
> > + }
> > +
> > + ttm_eu_backoff_reservation(&ticket, &list);
> > +
> > + afb->address = amdgpu_bo_gpu_offset(rbo);
> > +
> > + amdgpu_bo_ref(rbo);
> > +
> > + return 0;
> > +}
> > +
> > +static void amdgpu_vkms_cleanup_fb(struct drm_plane *plane,
> > + struct drm_plane_state *old_state)
> > +{
> > + struct amdgpu_bo *rbo;
> > + int r;
> > +
> > + if (!old_state->fb)
> > + return;
> > +
> > + rbo = gem_to_amdgpu_bo(old_state->fb->obj[0]);
> > + r = amdgpu_bo_reserve(rbo, false);
> > + if (unlikely(r)) {
> > + DRM_ERROR("failed to reserve rbo before unpin\n");
> > + return;
> > + }
> > +
> > + amdgpu_bo_unpin(rbo);
> > + amdgpu_bo_unreserve(rbo);
> > + amdgpu_bo_unref(&rbo);
> > +}
> > +
> > +static const struct drm_plane_helper_funcs amdgpu_vkms_primary_helper_funcs = {
> > + .atomic_update = amdgpu_vkms_plane_atomic_update,
> > + .atomic_check = amdgpu_vkms_plane_atomic_check,
> > + .prepare_fb = amdgpu_vkms_prepare_fb,
> > + .cleanup_fb = amdgpu_vkms_cleanup_fb,
> > +};
> > +
> > +static struct drm_plane *amdgpu_vkms_plane_init(struct drm_device *dev,
> > + enum drm_plane_type type,
> > + int index) {
> > + struct drm_plane *plane;
> > + int ret;
> > +
> > + plane = kzalloc(sizeof(*plane), GFP_KERNEL);
> > + if (!plane)
> > + return ERR_PTR(-ENOMEM);
> > +
> > + ret = drm_universal_plane_init(dev, plane, 1 << index,
> > + &amdgpu_vkms_plane_funcs,
> > + amdgpu_vkms_formats,
> > + ARRAY_SIZE(amdgpu_vkms_formats),
> > + NULL, type, NULL);
> > + if (ret) {
> > + kfree(plane);
> > + return ERR_PTR(ret);
> > + }
> > +
> > + drm_plane_helper_add(plane,
> > + &amdgpu_vkms_primary_helper_funcs);
> > +
> > + return plane;
> > +}
> > +
> > +int amdgpu_vkms_output_init(struct drm_device *dev,
> > + struct amdgpu_vkms_output *output, int
> > +index) {
> > + struct drm_connector *connector = &output->connector;
> > + struct drm_encoder *encoder = &output->encoder;
> > + struct drm_crtc *crtc = &output->crtc;
> > + struct drm_plane *primary, *cursor = NULL;
> > + int ret;
> > +
> > + primary = amdgpu_vkms_plane_init(dev, DRM_PLANE_TYPE_PRIMARY, index);
> > + if (IS_ERR(primary))
> > + return PTR_ERR(primary);
> > +
> > + ret = amdgpu_vkms_crtc_init(dev, crtc, primary, cursor);
> > + if (ret)
> > + goto err_crtc;
> > +
> > + ret = drm_connector_init(dev, connector, &amdgpu_vkms_connector_funcs,
> > + DRM_MODE_CONNECTOR_VIRTUAL);
> > + if (ret) {
> > + DRM_ERROR("Failed to init connector\n");
> > + goto err_connector;
> > + }
> > +
> > + drm_connector_helper_add(connector,
> > + &amdgpu_vkms_conn_helper_funcs);
> > +
> > + ret = drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_VIRTUAL);
> > + if (ret) {
> > + DRM_ERROR("Failed to init encoder\n");
> > + goto err_encoder;
> > + }
> > + encoder->possible_crtcs = 1 << index;
> > +
> > + ret = drm_connector_attach_encoder(connector, encoder);
> > + if (ret) {
> > + DRM_ERROR("Failed to attach connector to encoder\n");
> > + goto err_attach;
> > + }
> > +
> > + drm_mode_config_reset(dev);
> > +
> > + return 0;
> > +
> > +err_attach:
> > + drm_encoder_cleanup(encoder);
> > +
> > +err_encoder:
> > + drm_connector_cleanup(connector);
> > +
> > +err_connector:
> > + drm_crtc_cleanup(crtc);
> > +
> > +err_crtc:
> > + drm_plane_cleanup(primary);
> > +
> > + return ret;
> > +}
> > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.h
> > b/drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.h
> > new file mode 100644
> > index 000000000000..5dab51fbecf3
> > --- /dev/null
> > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.h
> > @@ -0,0 +1,29 @@
> > +/* SPDX-License-Identifier: GPL-2.0+ */
> > +
> > +#ifndef _AMDGPU_VKMS_H_
> > +#define _AMDGPU_VKMS_H_
> > +
> > +#define XRES_DEF 1024
> > +#define YRES_DEF 764
>
> Squash in the 768 fix here.
>
> > +
> > +#define XRES_MAX 16384
> > +#define YRES_MAX 16384
> > +
> > +#define drm_crtc_to_amdgpu_vkms_output(target) \
> > + container_of(target, struct amdgpu_vkms_output, crtc)
> > +
> > +extern const struct amdgpu_ip_block_version amdgpu_vkms_ip_block;
> > +
> > +struct amdgpu_vkms_output {
> > + struct drm_crtc crtc;
> > + struct drm_encoder encoder;
> > + struct drm_connector connector;
> > + struct hrtimer vblank_hrtimer;
> > + ktime_t period_ns;
> > + struct drm_pending_vblank_event *event; };
> > +
> > +int amdgpu_vkms_output_init(struct drm_device *dev,
> > + struct amdgpu_vkms_output *output, int
> > +index);
> > +
> > +#endif /* _AMDGPU_VKMS_H_ */
> > diff --git a/drivers/gpu/drm/amd/amdgpu/dce_virtual.c
> > b/drivers/gpu/drm/amd/amdgpu/dce_virtual.c
> > index 7e0d8c092c7e..642c77533157 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/dce_virtual.c
> > +++ b/drivers/gpu/drm/amd/amdgpu/dce_virtual.c
> > @@ -22,6 +22,7 @@
> > */
> >
> > #include <drm/drm_vblank.h>
> > +#include <drm/drm_atomic_helper.h>
> >
> > #include "amdgpu.h"
> > #include "amdgpu_pm.h"
> > @@ -40,6 +41,7 @@
> > #include "dce_virtual.h"
> > #include "ivsrcid/ivsrcid_vislands30.h"
> > #include "amdgpu_display.h"
> > +#include "amdgpu_vkms.h"
> >
> > #define DCE_VIRTUAL_VBLANK_PERIOD 16666666
> >
> > @@ -374,6 +376,12 @@ static const struct drm_connector_funcs dce_virtual_connector_funcs = {
> > .force = dce_virtual_force,
> > };
> >
> > +const struct drm_mode_config_funcs dce_virtual_mode_funcs = {
> > + .fb_create = amdgpu_display_user_framebuffer_create,
> > + .atomic_check = drm_atomic_helper_check,
> > + .atomic_commit = drm_atomic_helper_commit, };
> > +
> > static int dce_virtual_sw_init(void *handle) {
> > int r, i;
> > @@ -385,10 +393,10 @@ static int dce_virtual_sw_init(void *handle)
> >
> > adev_to_drm(adev)->max_vblank_count = 0;
> >
> > - adev_to_drm(adev)->mode_config.funcs = &amdgpu_mode_funcs;
> > + adev_to_drm(adev)->mode_config.funcs =
> > + &dce_virtual_mode_funcs;
> >
> > - adev_to_drm(adev)->mode_config.max_width = 16384;
> > - adev_to_drm(adev)->mode_config.max_height = 16384;
> > + adev_to_drm(adev)->mode_config.max_width = XRES_MAX;
> > + adev_to_drm(adev)->mode_config.max_height = YRES_MAX;
> >
> > adev_to_drm(adev)->mode_config.preferred_depth = 24;
> > adev_to_drm(adev)->mode_config.prefer_shadow = 1; @@ -399,15
> > +407,11 @@ static int dce_virtual_sw_init(void *handle)
> > if (r)
> > return r;
> >
> > - adev_to_drm(adev)->mode_config.max_width = 16384;
> > - adev_to_drm(adev)->mode_config.max_height = 16384;
> > + adev->amdgpu_vkms_output = kzalloc(sizeof(struct
> > + amdgpu_vkms_output) * adev->mode_info.num_crtc, GFP_KERNEL);
>
> You can use kcalloc here.
>
> >
> > /* allocate crtcs, encoders, connectors */
> > for (i = 0; i < adev->mode_info.num_crtc; i++) {
> > - r = dce_virtual_crtc_init(adev, i);
> > - if (r)
> > - return r;
> > - r = dce_virtual_connector_encoder_init(adev, i);
> > + r = amdgpu_vkms_output_init(adev_to_drm(adev),
> > + &adev->amdgpu_vkms_output[i], i);
> > if (r)
> > return r;
> > }
> > @@ -428,6 +432,7 @@ static int dce_virtual_sw_fini(void *handle)
> >
> > hrtimer_cancel(&adev->mode_info.crtcs[i]->vblank_timer);
> >
> > kfree(adev->mode_info.bios_hardcoded_edid);
> > + kfree(adev->amdgpu_vkms_output);
> >
> > drm_kms_helper_poll_fini(adev_to_drm(adev));
> >
> > --
> > 2.32.0
> >
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