// SPDX-License-Identifier: GPL-2.0 OR MIT
/*
* Xen para-virtual DRM device
*
* Copyright (C) 2016-2018 EPAM Systems Inc.
*
* Author: Oleksandr Andrushchenko <[email protected]>
*/
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_drv.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_framebuffer.h>
#include <drm/drm_gem.h>
#include <drm/drm_gem_atomic_helper.h>
#include <drm/drm_gem_framebuffer_helper.h>
#include <drm/drm_probe_helper.h>
#include <drm/drm_vblank.h>
#include "xen_drm_front.h"
#include "xen_drm_front_conn.h"
#include "xen_drm_front_kms.h"
/*
* Timeout in ms to wait for frame done event from the backend:
* must be a bit more than IO time-out
*/
#define FRAME_DONE_TO_MS (XEN_DRM_FRONT_WAIT_BACK_MS + 100)
static struct xen_drm_front_drm_pipeline *
to_xen_drm_pipeline(struct drm_simple_display_pipe *pipe)
{
return container_of(pipe, struct xen_drm_front_drm_pipeline, pipe);
}
static void fb_destroy(struct drm_framebuffer *fb)
{
struct xen_drm_front_drm_info *drm_info = fb->dev->dev_private;
int idx;
if (drm_dev_enter(fb->dev, &idx)) {
xen_drm_front_fb_detach(drm_info->front_info,
xen_drm_front_fb_to_cookie(fb));
drm_dev_exit(idx);
}
drm_gem_fb_destroy(fb);
}
static const struct drm_framebuffer_funcs fb_funcs = {
.destroy = fb_destroy,
};
static struct drm_framebuffer *
fb_create(struct drm_device *dev, struct drm_file *filp,
const struct drm_mode_fb_cmd2 *mode_cmd)
{
struct xen_drm_front_drm_info *drm_info = dev->dev_private;
struct drm_framebuffer *fb;
struct drm_gem_object *gem_obj;
int ret;
fb = drm_gem_fb_create_with_funcs(dev, filp, mode_cmd, &fb_funcs);
if (IS_ERR(fb))
return fb;
gem_obj = fb->obj[0];
ret = xen_drm_front_fb_attach(drm_info->front_info,
xen_drm_front_dbuf_to_cookie(gem_obj),
xen_drm_front_fb_to_cookie(fb),
fb->width, fb->height,
fb->format->format);
if (ret < 0) {
DRM_ERROR("Back failed to attach FB %p: %d\n", fb, ret);
goto fail;
}
return fb;
fail:
drm_gem_fb_destroy(fb);
return ERR_PTR(ret);
}
static const struct drm_mode_config_funcs mode_config_funcs = {
.fb_create = fb_create,
.atomic_check = drm_atomic_helper_check,
.atomic_commit = drm_atomic_helper_commit,
};
static void send_pending_event(struct xen_drm_front_drm_pipeline *pipeline)
{
struct drm_crtc *crtc = &pipeline->pipe.crtc;
struct drm_device *dev = crtc->dev;
unsigned long flags;
spin_lock_irqsave(&dev->event_lock, flags);
if (pipeline->pending_event)
drm_crtc_send_vblank_event(crtc, pipeline->pending_event);
pipeline->pending_event = NULL;
spin_unlock_irqrestore(&dev->event_lock, flags);
}
static void display_enable(struct drm_simple_display_pipe *pipe,
struct drm_crtc_state *crtc_state,
struct drm_plane_state *plane_state)
{
struct xen_drm_front_drm_pipeline *pipeline =
to_xen_drm_pipeline(pipe);
struct drm_crtc *crtc = &pipe->crtc;
struct drm_framebuffer *fb = plane_state->fb;
int ret, idx;
if (!drm_dev_enter(pipe->crtc.dev, &idx))
return;
ret = xen_drm_front_mode_set(pipeline, crtc->x, crtc->y,
fb->width, fb->height,
fb->format->cpp[0] * 8,
xen_drm_front_fb_to_cookie(fb));
if (ret) {
DRM_ERROR("Failed to enable display: %d\n", ret);
pipeline->conn_connected = false;
}
drm_dev_exit(idx);
}
static void display_disable(struct drm_simple_display_pipe *pipe)
{
struct xen_drm_front_drm_pipeline *pipeline =
to_xen_drm_pipeline(pipe);
int ret = 0, idx;
if (drm_dev_enter(pipe->crtc.dev, &idx)) {
ret = xen_drm_front_mode_set(pipeline, 0, 0, 0, 0, 0,
xen_drm_front_fb_to_cookie(NULL));
drm_dev_exit(idx);
}
if (ret)
DRM_ERROR("Failed to disable display: %d\n", ret);
/* Make sure we can restart with enabled connector next time */
pipeline->conn_connected = true;
/* release stalled event if any */
send_pending_event(pipeline);
}
void xen_drm_front_kms_on_frame_done(struct xen_drm_front_drm_pipeline *pipeline,
u64 fb_cookie)
{
/*
* This runs in interrupt context, e.g. under
* drm_info->front_info->io_lock, so we cannot call _sync version
* to cancel the work
*/
cancel_delayed_work(&pipeline->pflip_to_worker);
send_pending_event(pipeline);
}
static void pflip_to_worker(struct work_struct *work)
{
struct delayed_work *delayed_work = to_delayed_work(work);
struct xen_drm_front_drm_pipeline *pipeline =
container_of(delayed_work,
struct xen_drm_front_drm_pipeline,
pflip_to_worker);
DRM_ERROR("Frame done timed-out, releasing");
send_pending_event(pipeline);
}
static bool display_send_page_flip(struct drm_simple_display_pipe *pipe,
struct drm_plane_state *old_plane_state)
{
struct drm_plane_state *plane_state =
drm_atomic_get_new_plane_state(old_plane_state->state,
&pipe->plane);
/*
* If old_plane_state->fb is NULL and plane_state->fb is not,
* then this is an atomic commit which will enable display.
* If old_plane_state->fb is not NULL and plane_state->fb is,
* then this is an atomic commit which will disable display.
* Ignore these and do not send page flip as this framebuffer will be
* sent to the backend as a part of display_set_config call.
*/
if (old_plane_state->fb && plane_state->fb) {
struct xen_drm_front_drm_pipeline *pipeline =
to_xen_drm_pipeline(pipe);
struct xen_drm_front_drm_info *drm_info = pipeline->drm_info;
int ret;
schedule_delayed_work(&pipeline->pflip_to_worker,
msecs_to_jiffies(FRAME_DONE_TO_MS));
ret = xen_drm_front_page_flip(drm_info->front_info,
pipeline->index,
xen_drm_front_fb_to_cookie(plane_state->fb));
if (ret) {
DRM_ERROR("Failed to send page flip request to backend: %d\n", ret);
pipeline->conn_connected = false;
/*
* Report the flip not handled, so pending event is
* sent, unblocking user-space.
*/
return false;
}
/*
* Signal that page flip was handled, pending event will be sent
* on frame done event from the backend.
*/
return true;
}
return false;
}
static int display_check(struct drm_simple_display_pipe *pipe,
struct drm_plane_state *plane_state,
struct drm_crtc_state *crtc_state)
{
/*
* Xen doesn't initialize vblanking via drm_vblank_init(), so
* DRM helpers assume that it doesn't handle vblanking and start
* sending out fake VBLANK events automatically.
*
* As xen contains it's own logic for sending out VBLANK events
* in send_pending_event(), disable no_vblank (i.e., the xen
* driver has vblanking support).
*/
crtc_state->no_vblank = false;
return 0;
}
static void display_update(struct drm_simple_display_pipe *pipe,
struct drm_plane_state *old_plane_state)
{
struct xen_drm_front_drm_pipeline *pipeline =
to_xen_drm_pipeline(pipe);
struct drm_crtc *crtc = &pipe->crtc;
struct drm_pending_vblank_event *event;
int idx;
event = crtc->state->event;
if (event) {
struct drm_device *dev = crtc->dev;
unsigned long flags;
WARN_ON(pipeline->pending_event);
spin_lock_irqsave(&dev->event_lock, flags);
crtc->state->event = NULL;
pipeline->pending_event = event;
spin_unlock_irqrestore(&dev->event_lock, flags);
}
if (!drm_dev_enter(pipe->crtc.dev, &idx)) {
send_pending_event(pipeline);
return;
}
/*
* Send page flip request to the backend *after* we have event cached
* above, so on page flip done event from the backend we can
* deliver it and there is no race condition between this code and
* event from the backend.
* If this is not a page flip, e.g. no flip done event from the backend
* is expected, then send now.
*/
if (!display_send_page_flip(pipe, old_plane_state))
send_pending_event(pipeline);
drm_dev_exit(idx);
}
static enum drm_mode_status
display_mode_valid(struct drm_simple_display_pipe *pipe,
const struct drm_display_mode *mode)
{
struct xen_drm_front_drm_pipeline *pipeline =
container_of(pipe, struct xen_drm_front_drm_pipeline,
pipe);
if (mode->hdisplay != pipeline->width)
return MODE_ERROR;
if (mode->vdisplay != pipeline->height)
return MODE_ERROR;
return MODE_OK;
}
static const struct drm_simple_display_pipe_funcs display_funcs = {
.mode_valid = display_mode_valid,
.enable = display_enable,
.disable = display_disable,
.check = display_check,
.update = display_update,
};
static int display_pipe_init(struct xen_drm_front_drm_info *drm_info,
int index, struct xen_drm_front_cfg_connector *cfg,
struct xen_drm_front_drm_pipeline *pipeline)
{
struct drm_device *dev = drm_info->drm_dev;
const u32 *formats;
int format_count;
int ret;
pipeline->drm_info = drm_info;
pipeline->index = index;
pipeline->height = cfg->height;
pipeline->width = cfg->width;
INIT_DELAYED_WORK(&pipeline->pflip_to_worker, pflip_to_worker);
ret = xen_drm_front_conn_init(drm_info, &pipeline->conn);
if (ret)
return ret;
formats = xen_drm_front_conn_get_formats(&format_count);
return drm_simple_display_pipe_init(dev, &pipeline->pipe,
&display_funcs, formats,
format_count, NULL,
&pipeline->conn);
}
int xen_drm_front_kms_init(struct xen_drm_front_drm_info *drm_info)
{
struct drm_device *dev = drm_info->drm_dev;
int i, ret;
drm_mode_config_init(dev);
dev->mode_config.min_width = 0;
dev->mode_config.min_height = 0;
dev->mode_config.max_width = 4095;
dev->mode_config.max_height = 2047;
dev->mode_config.funcs = &mode_config_funcs;
for (i = 0; i < drm_info->front_info->cfg.num_connectors; i++) {
struct xen_drm_front_cfg_connector *cfg =
&drm_info->front_info->cfg.connectors[i];
struct xen_drm_front_drm_pipeline *pipeline =
&drm_info->pipeline[i];
ret = display_pipe_init(drm_info, i, cfg, pipeline);
if (ret) {
drm_mode_config_cleanup(dev);
return ret;
}
}
drm_mode_config_reset(dev);
drm_kms_helper_poll_init(dev);
return 0;
}
void xen_drm_front_kms_fini(struct xen_drm_front_drm_info *drm_info)
{
int i;
for (i = 0; i < drm_info->front_info->cfg.num_connectors; i++) {
struct xen_drm_front_drm_pipeline *pipeline =
&drm_info->pipeline[i];
cancel_delayed_work_sync(&pipeline->pflip_to_worker);
send_pending_event(pipeline);
}
}
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