virtgpu_display.c
/*
* Copyright (C) 2015 Red Hat, Inc.
* All Rights Reserved.
*
* Authors:
* Dave Airlie
* Alon Levy
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
#include <drm/drm_atomic_helper.h>
#include <drm/drm_damage_helper.h>
#include <drm/drm_edid.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_gem_framebuffer_helper.h>
#include <drm/drm_probe_helper.h>
#include <drm/drm_simple_kms_helper.h>
#include "virtgpu_drv.h"
#define XRES_MIN 32
#define YRES_MIN 32
#define XRES_DEF 1024
#define YRES_DEF 768
#define XRES_MAX 8192
#define YRES_MAX 8192
#define drm_connector_to_virtio_gpu_output(x) \
container_of(x, struct virtio_gpu_output, conn)
static const struct drm_crtc_funcs virtio_gpu_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,
};
static const struct drm_framebuffer_funcs virtio_gpu_fb_funcs = {
.create_handle = drm_gem_fb_create_handle,
.destroy = drm_gem_fb_destroy,
.dirty = drm_atomic_helper_dirtyfb,
};
static int
virtio_gpu_framebuffer_init(struct drm_device *dev,
struct virtio_gpu_framebuffer *vgfb,
const struct drm_mode_fb_cmd2 *mode_cmd,
struct drm_gem_object *obj)
{
int ret;
vgfb->base.obj[0] = obj;
drm_helper_mode_fill_fb_struct(dev, &vgfb->base, mode_cmd);
ret = drm_framebuffer_init(dev, &vgfb->base, &virtio_gpu_fb_funcs);
if (ret) {
vgfb->base.obj[0] = NULL;
return ret;
}
return 0;
}
static void virtio_gpu_crtc_mode_set_nofb(struct drm_crtc *crtc)
{
struct drm_device *dev = crtc->dev;
struct virtio_gpu_device *vgdev = dev->dev_private;
struct virtio_gpu_output *output = drm_crtc_to_virtio_gpu_output(crtc);
virtio_gpu_cmd_set_scanout(vgdev, output->index, 0,
crtc->mode.hdisplay,
crtc->mode.vdisplay, 0, 0);
virtio_gpu_notify(vgdev);
}
static void virtio_gpu_crtc_atomic_enable(struct drm_crtc *crtc,
struct drm_atomic_state *state)
{
}
static void virtio_gpu_crtc_atomic_disable(struct drm_crtc *crtc,
struct drm_atomic_state *state)
{
struct drm_device *dev = crtc->dev;
struct virtio_gpu_device *vgdev = dev->dev_private;
struct virtio_gpu_output *output = drm_crtc_to_virtio_gpu_output(crtc);
virtio_gpu_cmd_set_scanout(vgdev, output->index, 0, 0, 0, 0, 0);
virtio_gpu_notify(vgdev);
}
static int virtio_gpu_crtc_atomic_check(struct drm_crtc *crtc,
struct drm_atomic_state *state)
{
return 0;
}
static void virtio_gpu_crtc_atomic_flush(struct drm_crtc *crtc,
struct drm_atomic_state *state)
{
struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state,
crtc);
struct virtio_gpu_output *output = drm_crtc_to_virtio_gpu_output(crtc);
/*
* virtio-gpu can't do modeset and plane update operations
* independent from each other. So the actual modeset happens
* in the plane update callback, and here we just check
* whenever we must force the modeset.
*/
if (drm_atomic_crtc_needs_modeset(crtc_state)) {
output->needs_modeset = true;
}
}
static const struct drm_crtc_helper_funcs virtio_gpu_crtc_helper_funcs = {
.mode_set_nofb = virtio_gpu_crtc_mode_set_nofb,
.atomic_check = virtio_gpu_crtc_atomic_check,
.atomic_flush = virtio_gpu_crtc_atomic_flush,
.atomic_enable = virtio_gpu_crtc_atomic_enable,
.atomic_disable = virtio_gpu_crtc_atomic_disable,
};
static void virtio_gpu_enc_mode_set(struct drm_encoder *encoder,
struct drm_display_mode *mode,
struct drm_display_mode *adjusted_mode)
{
}
static void virtio_gpu_enc_enable(struct drm_encoder *encoder)
{
}
static void virtio_gpu_enc_disable(struct drm_encoder *encoder)
{
}
static int virtio_gpu_conn_get_modes(struct drm_connector *connector)
{
struct virtio_gpu_output *output =
drm_connector_to_virtio_gpu_output(connector);
struct drm_display_mode *mode = NULL;
int count, width, height;
if (output->edid) {
count = drm_add_edid_modes(connector, output->edid);
if (count)
return count;
}
width = le32_to_cpu(output->info.r.width);
height = le32_to_cpu(output->info.r.height);
count = drm_add_modes_noedid(connector, XRES_MAX, YRES_MAX);
if (width == 0 || height == 0) {
drm_set_preferred_mode(connector, XRES_DEF, YRES_DEF);
} else {
DRM_DEBUG("add mode: %dx%d\n", width, height);
mode = drm_cvt_mode(connector->dev, width, height, 60,
false, false, false);
if (!mode)
return count;
mode->type |= DRM_MODE_TYPE_PREFERRED;
drm_mode_probed_add(connector, mode);
count++;
}
return count;
}
static enum drm_mode_status virtio_gpu_conn_mode_valid(struct drm_connector *connector,
struct drm_display_mode *mode)
{
struct virtio_gpu_output *output =
drm_connector_to_virtio_gpu_output(connector);
int width, height;
width = le32_to_cpu(output->info.r.width);
height = le32_to_cpu(output->info.r.height);
if (!(mode->type & DRM_MODE_TYPE_PREFERRED))
return MODE_OK;
if (mode->hdisplay == XRES_DEF && mode->vdisplay == YRES_DEF)
return MODE_OK;
if (mode->hdisplay <= width && mode->hdisplay >= width - 16 &&
mode->vdisplay <= height && mode->vdisplay >= height - 16)
return MODE_OK;
DRM_DEBUG("del mode: %dx%d\n", mode->hdisplay, mode->vdisplay);
return MODE_BAD;
}
static const struct drm_encoder_helper_funcs virtio_gpu_enc_helper_funcs = {
.mode_set = virtio_gpu_enc_mode_set,
.enable = virtio_gpu_enc_enable,
.disable = virtio_gpu_enc_disable,
};
static const struct drm_connector_helper_funcs virtio_gpu_conn_helper_funcs = {
.get_modes = virtio_gpu_conn_get_modes,
.mode_valid = virtio_gpu_conn_mode_valid,
};
static enum drm_connector_status virtio_gpu_conn_detect(
struct drm_connector *connector,
bool force)
{
struct virtio_gpu_output *output =
drm_connector_to_virtio_gpu_output(connector);
if (output->info.enabled)
return connector_status_connected;
else
return connector_status_disconnected;
}
static void virtio_gpu_conn_destroy(struct drm_connector *connector)
{
drm_connector_unregister(connector);
drm_connector_cleanup(connector);
}
static const struct drm_connector_funcs virtio_gpu_connector_funcs = {
.detect = virtio_gpu_conn_detect,
.fill_modes = drm_helper_probe_single_connector_modes,
.destroy = virtio_gpu_conn_destroy,
.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 vgdev_output_init(struct virtio_gpu_device *vgdev, int index)
{
struct drm_device *dev = vgdev->ddev;
struct virtio_gpu_output *output = vgdev->outputs + index;
struct drm_connector *connector = &output->conn;
struct drm_encoder *encoder = &output->enc;
struct drm_crtc *crtc = &output->crtc;
struct drm_plane *primary, *cursor;
output->index = index;
if (index == 0) {
output->info.enabled = cpu_to_le32(true);
output->info.r.width = cpu_to_le32(XRES_DEF);
output->info.r.height = cpu_to_le32(YRES_DEF);
}
primary = virtio_gpu_plane_init(vgdev, DRM_PLANE_TYPE_PRIMARY, index);
if (IS_ERR(primary))
return PTR_ERR(primary);
cursor = virtio_gpu_plane_init(vgdev, DRM_PLANE_TYPE_CURSOR, index);
if (IS_ERR(cursor))
return PTR_ERR(cursor);
drm_crtc_init_with_planes(dev, crtc, primary, cursor,
&virtio_gpu_crtc_funcs, NULL);
drm_crtc_helper_add(crtc, &virtio_gpu_crtc_helper_funcs);
drm_connector_init(dev, connector, &virtio_gpu_connector_funcs,
DRM_MODE_CONNECTOR_VIRTUAL);
drm_connector_helper_add(connector, &virtio_gpu_conn_helper_funcs);
if (vgdev->has_edid)
drm_connector_attach_edid_property(connector);
drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_VIRTUAL);
drm_encoder_helper_add(encoder, &virtio_gpu_enc_helper_funcs);
encoder->possible_crtcs = 1 << index;
drm_connector_attach_encoder(connector, encoder);
drm_connector_register(connector);
return 0;
}
static struct drm_framebuffer *
virtio_gpu_user_framebuffer_create(struct drm_device *dev,
struct drm_file *file_priv,
const struct drm_mode_fb_cmd2 *mode_cmd)
{
struct drm_gem_object *obj = NULL;
struct virtio_gpu_framebuffer *virtio_gpu_fb;
int ret;
if (mode_cmd->pixel_format != DRM_FORMAT_HOST_XRGB8888 &&
mode_cmd->pixel_format != DRM_FORMAT_HOST_ARGB8888)
return ERR_PTR(-ENOENT);
/* lookup object associated with res handle */
obj = drm_gem_object_lookup(file_priv, mode_cmd->handles[0]);
if (!obj)
return ERR_PTR(-EINVAL);
virtio_gpu_fb = kzalloc(sizeof(*virtio_gpu_fb), GFP_KERNEL);
if (virtio_gpu_fb == NULL) {
drm_gem_object_put(obj);
return ERR_PTR(-ENOMEM);
}
ret = virtio_gpu_framebuffer_init(dev, virtio_gpu_fb, mode_cmd, obj);
if (ret) {
kfree(virtio_gpu_fb);
drm_gem_object_put(obj);
return NULL;
}
return &virtio_gpu_fb->base;
}
static const struct drm_mode_config_funcs virtio_gpu_mode_funcs = {
.fb_create = virtio_gpu_user_framebuffer_create,
.atomic_check = drm_atomic_helper_check,
.atomic_commit = drm_atomic_helper_commit,
};
int virtio_gpu_modeset_init(struct virtio_gpu_device *vgdev)
{
int i, ret;
if (!vgdev->num_scanouts)
return 0;
ret = drmm_mode_config_init(vgdev->ddev);
if (ret)
return ret;
vgdev->ddev->mode_config.quirk_addfb_prefer_host_byte_order = true;
vgdev->ddev->mode_config.funcs = &virtio_gpu_mode_funcs;
/* modes will be validated against the framebuffer size */
vgdev->ddev->mode_config.min_width = XRES_MIN;
vgdev->ddev->mode_config.min_height = YRES_MIN;
vgdev->ddev->mode_config.max_width = XRES_MAX;
vgdev->ddev->mode_config.max_height = YRES_MAX;
vgdev->ddev->mode_config.fb_modifiers_not_supported = true;
for (i = 0 ; i < vgdev->num_scanouts; ++i)
vgdev_output_init(vgdev, i);
drm_mode_config_reset(vgdev->ddev);
return 0;
}
void virtio_gpu_modeset_fini(struct virtio_gpu_device *vgdev)
{
int i;
if (!vgdev->num_scanouts)
return;
for (i = 0 ; i < vgdev->num_scanouts; ++i)
kfree(vgdev->outputs[i].edid);
}