570e86963a
This modifies the datatypes used by the vblank code to provide 64 bits
of vblank count.
The driver interfaces have been left using 32 bits of vblank count;
all of the code necessary to widen that value for the user API was
already included to handle devices returning fewer than 32-bits.
This will provide the necessary datatypes for the Vulkan API.
v2:
* Re-write wait_vblank ioctl to ABSOLUTE sequence
When an application uses the WAIT_VBLANK ioctl with RELATIVE
or NEXTONMISS bits set, the target vblank interval is updated
within the kernel. We need to write that target back to the
ioctl buffer and update the flags bits so that if the wait is
interrupted by a signal, when it is re-started, it will target
precisely the same vblank count as before.
* Leave driver API with 32-bit vblank count
v3:
* Rebase on top of Arnd Bergmann's patch which had
the switch to ktime_t parts.
[airlied: fix conflict with Ville vblank change].
Suggested-by: Michel Dänzer <michel@daenzer.net>
Suggested-by: Daniel Vetter <daniel@ffwll.ch>
Signed-off-by: Keith Packard <keithp@keithp.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
(cherry picked from commit 2affbc16983e4fc90960bc7f70e7615f4228199b)
185 lines
6.1 KiB
C
185 lines
6.1 KiB
C
/*
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* Copyright 2016 Intel Corp.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef _DRM_VBLANK_H_
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#define _DRM_VBLANK_H_
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#include <linux/seqlock.h>
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#include <linux/idr.h>
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#include <linux/poll.h>
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#include <drm/drm_file.h>
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#include <drm/drm_modes.h>
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#include <uapi/drm/drm.h>
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struct drm_device;
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struct drm_crtc;
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/**
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* struct drm_pending_vblank_event - pending vblank event tracking
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*/
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struct drm_pending_vblank_event {
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/**
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* @base: Base structure for tracking pending DRM events.
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*/
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struct drm_pending_event base;
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/**
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* @pipe: drm_crtc_index() of the &drm_crtc this event is for.
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*/
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unsigned int pipe;
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/**
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* @sequence: frame event should be triggered at
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*/
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u64 sequence;
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/**
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* @event: Actual event which will be sent to userspace.
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*/
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struct drm_event_vblank event;
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};
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/**
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* struct drm_vblank_crtc - vblank tracking for a CRTC
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*
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* This structure tracks the vblank state for one CRTC.
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*
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* Note that for historical reasons - the vblank handling code is still shared
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* with legacy/non-kms drivers - this is a free-standing structure not directly
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* connected to &struct drm_crtc. But all public interface functions are taking
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* a &struct drm_crtc to hide this implementation detail.
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*/
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struct drm_vblank_crtc {
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/**
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* @dev: Pointer to the &drm_device.
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*/
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struct drm_device *dev;
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/**
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* @queue: Wait queue for vblank waiters.
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*/
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wait_queue_head_t queue; /**< VBLANK wait queue */
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/**
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* @disable_timer: Disable timer for the delayed vblank disabling
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* hysteresis logic. Vblank disabling is controlled through the
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* drm_vblank_offdelay module option and the setting of the
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* &drm_device.max_vblank_count value.
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*/
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struct timer_list disable_timer;
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/**
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* @seqlock: Protect vblank count and time.
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*/
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seqlock_t seqlock; /* protects vblank count and time */
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/**
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* @count: Current software vblank counter.
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*/
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u64 count;
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/**
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* @time: Vblank timestamp corresponding to @count.
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*/
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ktime_t time;
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/**
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* @refcount: Number of users/waiters of the vblank interrupt. Only when
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* this refcount reaches 0 can the hardware interrupt be disabled using
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* @disable_timer.
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*/
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atomic_t refcount; /* number of users of vblank interruptsper crtc */
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/**
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* @last: Protected by &drm_device.vbl_lock, used for wraparound handling.
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*/
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u32 last;
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/**
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* @inmodeset: Tracks whether the vblank is disabled due to a modeset.
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* For legacy driver bit 2 additionally tracks whether an additional
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* temporary vblank reference has been acquired to paper over the
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* hardware counter resetting/jumping. KMS drivers should instead just
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* call drm_crtc_vblank_off() and drm_crtc_vblank_on(), which explicitly
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* save and restore the vblank count.
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*/
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unsigned int inmodeset; /* Display driver is setting mode */
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/**
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* @pipe: drm_crtc_index() of the &drm_crtc corresponding to this
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* structure.
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*/
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unsigned int pipe;
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/**
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* @framedur_ns: Frame/Field duration in ns, used by
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* drm_calc_vbltimestamp_from_scanoutpos() and computed by
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* drm_calc_timestamping_constants().
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*/
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int framedur_ns;
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/**
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* @linedur_ns: Line duration in ns, used by
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* drm_calc_vbltimestamp_from_scanoutpos() and computed by
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* drm_calc_timestamping_constants().
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*/
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int linedur_ns;
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/**
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* @hwmode:
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*
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* Cache of the current hardware display mode. Only valid when @enabled
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* is set. This is used by helpers like
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* drm_calc_vbltimestamp_from_scanoutpos(). We can't just access the
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* hardware mode by e.g. looking at &drm_crtc_state.adjusted_mode,
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* because that one is really hard to get from interrupt context.
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*/
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struct drm_display_mode hwmode;
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/**
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* @enabled: Tracks the enabling state of the corresponding &drm_crtc to
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* avoid double-disabling and hence corrupting saved state. Needed by
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* drivers not using atomic KMS, since those might go through their CRTC
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* disabling functions multiple times.
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*/
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bool enabled;
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};
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int drm_vblank_init(struct drm_device *dev, unsigned int num_crtcs);
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u64 drm_crtc_vblank_count(struct drm_crtc *crtc);
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u64 drm_crtc_vblank_count_and_time(struct drm_crtc *crtc,
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ktime_t *vblanktime);
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void drm_crtc_send_vblank_event(struct drm_crtc *crtc,
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struct drm_pending_vblank_event *e);
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void drm_crtc_arm_vblank_event(struct drm_crtc *crtc,
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struct drm_pending_vblank_event *e);
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bool drm_handle_vblank(struct drm_device *dev, unsigned int pipe);
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bool drm_crtc_handle_vblank(struct drm_crtc *crtc);
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int drm_crtc_vblank_get(struct drm_crtc *crtc);
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void drm_crtc_vblank_put(struct drm_crtc *crtc);
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void drm_wait_one_vblank(struct drm_device *dev, unsigned int pipe);
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void drm_crtc_wait_one_vblank(struct drm_crtc *crtc);
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void drm_crtc_vblank_off(struct drm_crtc *crtc);
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void drm_crtc_vblank_reset(struct drm_crtc *crtc);
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void drm_crtc_vblank_on(struct drm_crtc *crtc);
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u32 drm_crtc_accurate_vblank_count(struct drm_crtc *crtc);
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bool drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
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unsigned int pipe, int *max_error,
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ktime_t *vblank_time,
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bool in_vblank_irq);
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void drm_calc_timestamping_constants(struct drm_crtc *crtc,
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const struct drm_display_mode *mode);
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wait_queue_head_t *drm_crtc_vblank_waitqueue(struct drm_crtc *crtc);
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#endif
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