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// SPDX-License-Identifier: GPL-2.0+
#include <linux/dma-buf-map.h>
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_gem_atomic_helper.h>
#include <drm/drm_gem_framebuffer_helper.h>
#include <drm/drm_plane_helper.h>
#include <drm/drm_gem_shmem_helper.h>
#include "vkms_drv.h"
static const u32 vkms_formats[] = {
DRM_FORMAT_XRGB8888,
};
static const u32 vkms_cursor_formats[] = {
DRM_FORMAT_ARGB8888,
};
static struct drm_plane_state *
vkms_plane_duplicate_state(struct drm_plane *plane)
{
struct vkms_plane_state *vkms_state;
struct vkms_composer *composer;
vkms_state = kzalloc(sizeof(*vkms_state), GFP_KERNEL);
if (!vkms_state)
return NULL;
composer = kzalloc(sizeof(*composer), GFP_KERNEL);
if (!composer) {
DRM_DEBUG_KMS("Couldn't allocate composer\n");
kfree(vkms_state);
return NULL;
}
vkms_state->composer = composer;
__drm_atomic_helper_plane_duplicate_state(plane,
&vkms_state->base);
return &vkms_state->base;
}
static void vkms_plane_destroy_state(struct drm_plane *plane,
struct drm_plane_state *old_state)
{
struct vkms_plane_state *vkms_state = to_vkms_plane_state(old_state);
struct drm_crtc *crtc = vkms_state->base.crtc;
if (crtc) {
/* dropping the reference we acquired in
* vkms_primary_plane_update()
*/
if (drm_framebuffer_read_refcount(&vkms_state->composer->fb))
drm_framebuffer_put(&vkms_state->composer->fb);
}
kfree(vkms_state->composer);
vkms_state->composer = NULL;
__drm_atomic_helper_plane_destroy_state(old_state);
kfree(vkms_state);
}
static void vkms_plane_reset(struct drm_plane *plane)
{
struct vkms_plane_state *vkms_state;
if (plane->state)
vkms_plane_destroy_state(plane, plane->state);
vkms_state = kzalloc(sizeof(*vkms_state), GFP_KERNEL);
if (!vkms_state) {
DRM_ERROR("Cannot allocate vkms_plane_state\n");
return;
}
plane->state = &vkms_state->base;
plane->state->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 = drm_plane_cleanup,
.reset = vkms_plane_reset,
.atomic_duplicate_state = vkms_plane_duplicate_state,
.atomic_destroy_state = vkms_plane_destroy_state,
};
static void vkms_plane_atomic_update(struct drm_plane *plane,
struct drm_plane_state *old_state)
{
struct vkms_plane_state *vkms_plane_state;
struct drm_framebuffer *fb = plane->state->fb;
struct vkms_composer *composer;
if (!plane->state->crtc || !fb)
return;
vkms_plane_state = to_vkms_plane_state(plane->state);
composer = vkms_plane_state->composer;
memcpy(&composer->src, &plane->state->src, sizeof(struct drm_rect));
memcpy(&composer->dst, &plane->state->dst, sizeof(struct drm_rect));
memcpy(&composer->fb, fb, sizeof(struct drm_framebuffer));
drm_framebuffer_get(&composer->fb);
composer->offset = fb->offsets[0];
composer->pitch = fb->pitches[0];
composer->cpp = fb->format->cpp[0];
}
static int vkms_plane_atomic_check(struct drm_plane *plane,
struct drm_atomic_state *state)
{
struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(state,
plane);
struct drm_crtc_state *crtc_state;
bool can_position = false;
int ret;
if (!new_plane_state->fb || WARN_ON(!new_plane_state->crtc))
return 0;
crtc_state = drm_atomic_get_crtc_state(state,
new_plane_state->crtc);
if (IS_ERR(crtc_state))
return PTR_ERR(crtc_state);
if (plane->type == DRM_PLANE_TYPE_CURSOR)
can_position = true;
ret = drm_atomic_helper_check_plane_state(new_plane_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 (!new_plane_state->visible && !can_position)
return -EINVAL;
return 0;
}
static int vkms_prepare_fb(struct drm_plane *plane,
struct drm_plane_state *state)
{
struct drm_gem_object *gem_obj;
struct dma_buf_map map;
int ret;
if (!state->fb)
return 0;
gem_obj = drm_gem_fb_get_obj(state->fb, 0);
ret = drm_gem_shmem_vmap(gem_obj, &map);
if (ret)
DRM_ERROR("vmap failed: %d\n", ret);
return drm_gem_plane_helper_prepare_fb(plane, state);
}
static void vkms_cleanup_fb(struct drm_plane *plane,
struct drm_plane_state *old_state)
{
struct drm_gem_object *gem_obj;
struct drm_gem_shmem_object *shmem_obj;
struct dma_buf_map map;
if (!old_state->fb)
return;
gem_obj = drm_gem_fb_get_obj(old_state->fb, 0);
shmem_obj = to_drm_gem_shmem_obj(drm_gem_fb_get_obj(old_state->fb, 0));
dma_buf_map_set_vaddr(&map, shmem_obj->vaddr);
drm_gem_shmem_vunmap(gem_obj, &map);
}
static const struct drm_plane_helper_funcs vkms_primary_helper_funcs = {
.atomic_update = vkms_plane_atomic_update,
.atomic_check = vkms_plane_atomic_check,
.prepare_fb = vkms_prepare_fb,
.cleanup_fb = vkms_cleanup_fb,
};
struct drm_plane *vkms_plane_init(struct vkms_device *vkmsdev,
enum drm_plane_type type, int index)
{
struct drm_device *dev = &vkmsdev->drm;
const struct drm_plane_helper_funcs *funcs;
struct drm_plane *plane;
const u32 *formats;
int ret, nformats;
plane = kzalloc(sizeof(*plane), GFP_KERNEL);
if (!plane)
return ERR_PTR(-ENOMEM);
if (type == DRM_PLANE_TYPE_CURSOR) {
formats = vkms_cursor_formats;
nformats = ARRAY_SIZE(vkms_cursor_formats);
funcs = &vkms_primary_helper_funcs;
} else {
formats = vkms_formats;
nformats = ARRAY_SIZE(vkms_formats);
funcs = &vkms_primary_helper_funcs;
}
ret = drm_universal_plane_init(dev, plane, 1 << index,
&vkms_plane_funcs,
formats, nformats,
NULL, type, NULL);
if (ret) {
kfree(plane);
return ERR_PTR(ret);
}
drm_plane_helper_add(plane, funcs);
return plane;
}
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