1965 строки
58 KiB
C
1965 строки
58 KiB
C
/*
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* drm_irq.c IRQ and vblank support
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*
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* \author Rickard E. (Rik) Faith <faith@valinux.com>
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* \author Gareth Hughes <gareth@valinux.com>
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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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#include <linux/export.h>
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#include <linux/moduleparam.h>
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#include <drm/drm_crtc.h>
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#include <drm/drm_drv.h>
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#include <drm/drm_framebuffer.h>
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#include <drm/drm_print.h>
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#include <drm/drm_os_linux.h>
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#include <drm/drm_vblank.h>
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#include "drm_internal.h"
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#include "drm_trace.h"
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/**
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* DOC: vblank handling
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*
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* Vertical blanking plays a major role in graphics rendering. To achieve
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* tear-free display, users must synchronize page flips and/or rendering to
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* vertical blanking. The DRM API offers ioctls to perform page flips
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* synchronized to vertical blanking and wait for vertical blanking.
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*
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* The DRM core handles most of the vertical blanking management logic, which
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* involves filtering out spurious interrupts, keeping race-free blanking
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* counters, coping with counter wrap-around and resets and keeping use counts.
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* It relies on the driver to generate vertical blanking interrupts and
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* optionally provide a hardware vertical blanking counter.
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*
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* Drivers must initialize the vertical blanking handling core with a call to
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* drm_vblank_init(). Minimally, a driver needs to implement
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* &drm_crtc_funcs.enable_vblank and &drm_crtc_funcs.disable_vblank plus call
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* drm_crtc_handle_vblank() in its vblank interrupt handler for working vblank
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* support.
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*
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* Vertical blanking interrupts can be enabled by the DRM core or by drivers
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* themselves (for instance to handle page flipping operations). The DRM core
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* maintains a vertical blanking use count to ensure that the interrupts are not
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* disabled while a user still needs them. To increment the use count, drivers
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* call drm_crtc_vblank_get() and release the vblank reference again with
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* drm_crtc_vblank_put(). In between these two calls vblank interrupts are
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* guaranteed to be enabled.
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*
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* On many hardware disabling the vblank interrupt cannot be done in a race-free
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* manner, see &drm_driver.vblank_disable_immediate and
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* &drm_driver.max_vblank_count. In that case the vblank core only disables the
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* vblanks after a timer has expired, which can be configured through the
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* ``vblankoffdelay`` module parameter.
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*/
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/* Retry timestamp calculation up to 3 times to satisfy
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* drm_timestamp_precision before giving up.
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*/
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#define DRM_TIMESTAMP_MAXRETRIES 3
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/* Threshold in nanoseconds for detection of redundant
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* vblank irq in drm_handle_vblank(). 1 msec should be ok.
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*/
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#define DRM_REDUNDANT_VBLIRQ_THRESH_NS 1000000
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static bool
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drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe,
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ktime_t *tvblank, bool in_vblank_irq);
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static unsigned int drm_timestamp_precision = 20; /* Default to 20 usecs. */
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static int drm_vblank_offdelay = 5000; /* Default to 5000 msecs. */
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module_param_named(vblankoffdelay, drm_vblank_offdelay, int, 0600);
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module_param_named(timestamp_precision_usec, drm_timestamp_precision, int, 0600);
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MODULE_PARM_DESC(vblankoffdelay, "Delay until vblank irq auto-disable [msecs] (0: never disable, <0: disable immediately)");
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MODULE_PARM_DESC(timestamp_precision_usec, "Max. error on timestamps [usecs]");
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static void store_vblank(struct drm_device *dev, unsigned int pipe,
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u32 vblank_count_inc,
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ktime_t t_vblank, u32 last)
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{
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struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
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assert_spin_locked(&dev->vblank_time_lock);
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vblank->last = last;
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write_seqlock(&vblank->seqlock);
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vblank->time = t_vblank;
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vblank->count += vblank_count_inc;
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write_sequnlock(&vblank->seqlock);
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}
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static u32 drm_max_vblank_count(struct drm_device *dev, unsigned int pipe)
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{
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struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
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return vblank->max_vblank_count ?: dev->max_vblank_count;
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}
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/*
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* "No hw counter" fallback implementation of .get_vblank_counter() hook,
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* if there is no useable hardware frame counter available.
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*/
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static u32 drm_vblank_no_hw_counter(struct drm_device *dev, unsigned int pipe)
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{
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WARN_ON_ONCE(drm_max_vblank_count(dev, pipe) != 0);
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return 0;
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}
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static u32 __get_vblank_counter(struct drm_device *dev, unsigned int pipe)
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{
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if (drm_core_check_feature(dev, DRIVER_MODESET)) {
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struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe);
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if (WARN_ON(!crtc))
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return 0;
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if (crtc->funcs->get_vblank_counter)
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return crtc->funcs->get_vblank_counter(crtc);
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}
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if (dev->driver->get_vblank_counter)
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return dev->driver->get_vblank_counter(dev, pipe);
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return drm_vblank_no_hw_counter(dev, pipe);
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}
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/*
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* Reset the stored timestamp for the current vblank count to correspond
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* to the last vblank occurred.
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*
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* Only to be called from drm_crtc_vblank_on().
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*
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* Note: caller must hold &drm_device.vbl_lock since this reads & writes
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* device vblank fields.
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*/
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static void drm_reset_vblank_timestamp(struct drm_device *dev, unsigned int pipe)
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{
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u32 cur_vblank;
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bool rc;
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ktime_t t_vblank;
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int count = DRM_TIMESTAMP_MAXRETRIES;
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spin_lock(&dev->vblank_time_lock);
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/*
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* sample the current counter to avoid random jumps
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* when drm_vblank_enable() applies the diff
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*/
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do {
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cur_vblank = __get_vblank_counter(dev, pipe);
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rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, false);
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} while (cur_vblank != __get_vblank_counter(dev, pipe) && --count > 0);
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/*
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* Only reinitialize corresponding vblank timestamp if high-precision query
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* available and didn't fail. Otherwise reinitialize delayed at next vblank
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* interrupt and assign 0 for now, to mark the vblanktimestamp as invalid.
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*/
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if (!rc)
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t_vblank = 0;
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/*
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* +1 to make sure user will never see the same
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* vblank counter value before and after a modeset
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*/
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store_vblank(dev, pipe, 1, t_vblank, cur_vblank);
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spin_unlock(&dev->vblank_time_lock);
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}
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/*
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* Call back into the driver to update the appropriate vblank counter
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* (specified by @pipe). Deal with wraparound, if it occurred, and
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* update the last read value so we can deal with wraparound on the next
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* call if necessary.
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*
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* Only necessary when going from off->on, to account for frames we
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* didn't get an interrupt for.
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*
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* Note: caller must hold &drm_device.vbl_lock since this reads & writes
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* device vblank fields.
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*/
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static void drm_update_vblank_count(struct drm_device *dev, unsigned int pipe,
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bool in_vblank_irq)
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{
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struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
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u32 cur_vblank, diff;
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bool rc;
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ktime_t t_vblank;
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int count = DRM_TIMESTAMP_MAXRETRIES;
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int framedur_ns = vblank->framedur_ns;
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u32 max_vblank_count = drm_max_vblank_count(dev, pipe);
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/*
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* Interrupts were disabled prior to this call, so deal with counter
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* wrap if needed.
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* NOTE! It's possible we lost a full dev->max_vblank_count + 1 events
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* here if the register is small or we had vblank interrupts off for
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* a long time.
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*
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* We repeat the hardware vblank counter & timestamp query until
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* we get consistent results. This to prevent races between gpu
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* updating its hardware counter while we are retrieving the
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* corresponding vblank timestamp.
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*/
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do {
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cur_vblank = __get_vblank_counter(dev, pipe);
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rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, in_vblank_irq);
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} while (cur_vblank != __get_vblank_counter(dev, pipe) && --count > 0);
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if (max_vblank_count) {
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/* trust the hw counter when it's around */
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diff = (cur_vblank - vblank->last) & max_vblank_count;
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} else if (rc && framedur_ns) {
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u64 diff_ns = ktime_to_ns(ktime_sub(t_vblank, vblank->time));
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/*
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* Figure out how many vblanks we've missed based
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* on the difference in the timestamps and the
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* frame/field duration.
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*/
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DRM_DEBUG_VBL("crtc %u: Calculating number of vblanks."
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" diff_ns = %lld, framedur_ns = %d)\n",
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pipe, (long long) diff_ns, framedur_ns);
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diff = DIV_ROUND_CLOSEST_ULL(diff_ns, framedur_ns);
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if (diff == 0 && in_vblank_irq)
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DRM_DEBUG_VBL("crtc %u: Redundant vblirq ignored\n",
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pipe);
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} else {
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/* some kind of default for drivers w/o accurate vbl timestamping */
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diff = in_vblank_irq ? 1 : 0;
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}
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/*
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* Within a drm_vblank_pre_modeset - drm_vblank_post_modeset
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* interval? If so then vblank irqs keep running and it will likely
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* happen that the hardware vblank counter is not trustworthy as it
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* might reset at some point in that interval and vblank timestamps
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* are not trustworthy either in that interval. Iow. this can result
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* in a bogus diff >> 1 which must be avoided as it would cause
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* random large forward jumps of the software vblank counter.
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*/
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if (diff > 1 && (vblank->inmodeset & 0x2)) {
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DRM_DEBUG_VBL("clamping vblank bump to 1 on crtc %u: diffr=%u"
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" due to pre-modeset.\n", pipe, diff);
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diff = 1;
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}
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DRM_DEBUG_VBL("updating vblank count on crtc %u:"
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" current=%llu, diff=%u, hw=%u hw_last=%u\n",
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pipe, vblank->count, diff, cur_vblank, vblank->last);
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if (diff == 0) {
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WARN_ON_ONCE(cur_vblank != vblank->last);
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return;
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}
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/*
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* Only reinitialize corresponding vblank timestamp if high-precision query
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* available and didn't fail, or we were called from the vblank interrupt.
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* Otherwise reinitialize delayed at next vblank interrupt and assign 0
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* for now, to mark the vblanktimestamp as invalid.
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*/
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if (!rc && !in_vblank_irq)
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t_vblank = 0;
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store_vblank(dev, pipe, diff, t_vblank, cur_vblank);
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}
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static u64 drm_vblank_count(struct drm_device *dev, unsigned int pipe)
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{
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struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
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if (WARN_ON(pipe >= dev->num_crtcs))
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return 0;
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return vblank->count;
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}
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/**
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* drm_crtc_accurate_vblank_count - retrieve the master vblank counter
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* @crtc: which counter to retrieve
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*
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* This function is similar to drm_crtc_vblank_count() but this function
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* interpolates to handle a race with vblank interrupts using the high precision
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* timestamping support.
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*
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* This is mostly useful for hardware that can obtain the scanout position, but
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* doesn't have a hardware frame counter.
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*/
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u64 drm_crtc_accurate_vblank_count(struct drm_crtc *crtc)
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{
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struct drm_device *dev = crtc->dev;
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unsigned int pipe = drm_crtc_index(crtc);
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u64 vblank;
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unsigned long flags;
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WARN_ONCE(drm_debug & DRM_UT_VBL && !dev->driver->get_vblank_timestamp,
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"This function requires support for accurate vblank timestamps.");
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spin_lock_irqsave(&dev->vblank_time_lock, flags);
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drm_update_vblank_count(dev, pipe, false);
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vblank = drm_vblank_count(dev, pipe);
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spin_unlock_irqrestore(&dev->vblank_time_lock, flags);
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return vblank;
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}
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EXPORT_SYMBOL(drm_crtc_accurate_vblank_count);
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static void __disable_vblank(struct drm_device *dev, unsigned int pipe)
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{
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if (drm_core_check_feature(dev, DRIVER_MODESET)) {
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struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe);
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if (WARN_ON(!crtc))
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return;
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if (crtc->funcs->disable_vblank) {
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crtc->funcs->disable_vblank(crtc);
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return;
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}
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}
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dev->driver->disable_vblank(dev, pipe);
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}
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/*
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* Disable vblank irq's on crtc, make sure that last vblank count
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* of hardware and corresponding consistent software vblank counter
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* are preserved, even if there are any spurious vblank irq's after
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* disable.
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*/
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void drm_vblank_disable_and_save(struct drm_device *dev, unsigned int pipe)
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{
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struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
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unsigned long irqflags;
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assert_spin_locked(&dev->vbl_lock);
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/* Prevent vblank irq processing while disabling vblank irqs,
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* so no updates of timestamps or count can happen after we've
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* disabled. Needed to prevent races in case of delayed irq's.
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*/
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spin_lock_irqsave(&dev->vblank_time_lock, irqflags);
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/*
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* Update vblank count and disable vblank interrupts only if the
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* interrupts were enabled. This avoids calling the ->disable_vblank()
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* operation in atomic context with the hardware potentially runtime
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* suspended.
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*/
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if (!vblank->enabled)
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goto out;
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/*
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* Update the count and timestamp to maintain the
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* appearance that the counter has been ticking all along until
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* this time. This makes the count account for the entire time
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* between drm_crtc_vblank_on() and drm_crtc_vblank_off().
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*/
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drm_update_vblank_count(dev, pipe, false);
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__disable_vblank(dev, pipe);
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vblank->enabled = false;
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out:
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spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags);
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}
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static void vblank_disable_fn(struct timer_list *t)
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{
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struct drm_vblank_crtc *vblank = from_timer(vblank, t, disable_timer);
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struct drm_device *dev = vblank->dev;
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unsigned int pipe = vblank->pipe;
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unsigned long irqflags;
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spin_lock_irqsave(&dev->vbl_lock, irqflags);
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if (atomic_read(&vblank->refcount) == 0 && vblank->enabled) {
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DRM_DEBUG("disabling vblank on crtc %u\n", pipe);
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drm_vblank_disable_and_save(dev, pipe);
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}
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spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
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}
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void drm_vblank_cleanup(struct drm_device *dev)
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{
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unsigned int pipe;
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/* Bail if the driver didn't call drm_vblank_init() */
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if (dev->num_crtcs == 0)
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return;
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for (pipe = 0; pipe < dev->num_crtcs; pipe++) {
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struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
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WARN_ON(READ_ONCE(vblank->enabled) &&
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drm_core_check_feature(dev, DRIVER_MODESET));
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del_timer_sync(&vblank->disable_timer);
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}
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kfree(dev->vblank);
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dev->num_crtcs = 0;
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}
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/**
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* drm_vblank_init - initialize vblank support
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* @dev: DRM device
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* @num_crtcs: number of CRTCs supported by @dev
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*
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* This function initializes vblank support for @num_crtcs display pipelines.
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* Cleanup is handled by the DRM core, or through calling drm_dev_fini() for
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* drivers with a &drm_driver.release callback.
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*
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* Returns:
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* Zero on success or a negative error code on failure.
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*/
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int drm_vblank_init(struct drm_device *dev, unsigned int num_crtcs)
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{
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int ret = -ENOMEM;
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unsigned int i;
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spin_lock_init(&dev->vbl_lock);
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spin_lock_init(&dev->vblank_time_lock);
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dev->num_crtcs = num_crtcs;
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dev->vblank = kcalloc(num_crtcs, sizeof(*dev->vblank), GFP_KERNEL);
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if (!dev->vblank)
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goto err;
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for (i = 0; i < num_crtcs; i++) {
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struct drm_vblank_crtc *vblank = &dev->vblank[i];
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vblank->dev = dev;
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vblank->pipe = i;
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init_waitqueue_head(&vblank->queue);
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timer_setup(&vblank->disable_timer, vblank_disable_fn, 0);
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seqlock_init(&vblank->seqlock);
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}
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DRM_INFO("Supports vblank timestamp caching Rev 2 (21.10.2013).\n");
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/* Driver specific high-precision vblank timestamping supported? */
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if (dev->driver->get_vblank_timestamp)
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DRM_INFO("Driver supports precise vblank timestamp query.\n");
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else
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DRM_INFO("No driver support for vblank timestamp query.\n");
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/* Must have precise timestamping for reliable vblank instant disable */
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if (dev->vblank_disable_immediate && !dev->driver->get_vblank_timestamp) {
|
|
dev->vblank_disable_immediate = false;
|
|
DRM_INFO("Setting vblank_disable_immediate to false because "
|
|
"get_vblank_timestamp == NULL\n");
|
|
}
|
|
|
|
return 0;
|
|
|
|
err:
|
|
dev->num_crtcs = 0;
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(drm_vblank_init);
|
|
|
|
/**
|
|
* drm_crtc_vblank_waitqueue - get vblank waitqueue for the CRTC
|
|
* @crtc: which CRTC's vblank waitqueue to retrieve
|
|
*
|
|
* This function returns a pointer to the vblank waitqueue for the CRTC.
|
|
* Drivers can use this to implement vblank waits using wait_event() and related
|
|
* functions.
|
|
*/
|
|
wait_queue_head_t *drm_crtc_vblank_waitqueue(struct drm_crtc *crtc)
|
|
{
|
|
return &crtc->dev->vblank[drm_crtc_index(crtc)].queue;
|
|
}
|
|
EXPORT_SYMBOL(drm_crtc_vblank_waitqueue);
|
|
|
|
|
|
/**
|
|
* drm_calc_timestamping_constants - calculate vblank timestamp constants
|
|
* @crtc: drm_crtc whose timestamp constants should be updated.
|
|
* @mode: display mode containing the scanout timings
|
|
*
|
|
* Calculate and store various constants which are later needed by vblank and
|
|
* swap-completion timestamping, e.g, by
|
|
* drm_calc_vbltimestamp_from_scanoutpos(). They are derived from CRTC's true
|
|
* scanout timing, so they take things like panel scaling or other adjustments
|
|
* into account.
|
|
*/
|
|
void drm_calc_timestamping_constants(struct drm_crtc *crtc,
|
|
const struct drm_display_mode *mode)
|
|
{
|
|
struct drm_device *dev = crtc->dev;
|
|
unsigned int pipe = drm_crtc_index(crtc);
|
|
struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
|
|
int linedur_ns = 0, framedur_ns = 0;
|
|
int dotclock = mode->crtc_clock;
|
|
|
|
if (!dev->num_crtcs)
|
|
return;
|
|
|
|
if (WARN_ON(pipe >= dev->num_crtcs))
|
|
return;
|
|
|
|
/* Valid dotclock? */
|
|
if (dotclock > 0) {
|
|
int frame_size = mode->crtc_htotal * mode->crtc_vtotal;
|
|
|
|
/*
|
|
* Convert scanline length in pixels and video
|
|
* dot clock to line duration and frame duration
|
|
* in nanoseconds:
|
|
*/
|
|
linedur_ns = div_u64((u64) mode->crtc_htotal * 1000000, dotclock);
|
|
framedur_ns = div_u64((u64) frame_size * 1000000, dotclock);
|
|
|
|
/*
|
|
* Fields of interlaced scanout modes are only half a frame duration.
|
|
*/
|
|
if (mode->flags & DRM_MODE_FLAG_INTERLACE)
|
|
framedur_ns /= 2;
|
|
} else
|
|
DRM_ERROR("crtc %u: Can't calculate constants, dotclock = 0!\n",
|
|
crtc->base.id);
|
|
|
|
vblank->linedur_ns = linedur_ns;
|
|
vblank->framedur_ns = framedur_ns;
|
|
vblank->hwmode = *mode;
|
|
|
|
DRM_DEBUG("crtc %u: hwmode: htotal %d, vtotal %d, vdisplay %d\n",
|
|
crtc->base.id, mode->crtc_htotal,
|
|
mode->crtc_vtotal, mode->crtc_vdisplay);
|
|
DRM_DEBUG("crtc %u: clock %d kHz framedur %d linedur %d\n",
|
|
crtc->base.id, dotclock, framedur_ns, linedur_ns);
|
|
}
|
|
EXPORT_SYMBOL(drm_calc_timestamping_constants);
|
|
|
|
/**
|
|
* drm_calc_vbltimestamp_from_scanoutpos - precise vblank timestamp helper
|
|
* @dev: DRM device
|
|
* @pipe: index of CRTC whose vblank timestamp to retrieve
|
|
* @max_error: Desired maximum allowable error in timestamps (nanosecs)
|
|
* On return contains true maximum error of timestamp
|
|
* @vblank_time: Pointer to time which should receive the timestamp
|
|
* @in_vblank_irq:
|
|
* True when called from drm_crtc_handle_vblank(). Some drivers
|
|
* need to apply some workarounds for gpu-specific vblank irq quirks
|
|
* if flag is set.
|
|
*
|
|
* Implements calculation of exact vblank timestamps from given drm_display_mode
|
|
* timings and current video scanout position of a CRTC. This can be directly
|
|
* used as the &drm_driver.get_vblank_timestamp implementation of a kms driver
|
|
* if &drm_driver.get_scanout_position is implemented.
|
|
*
|
|
* The current implementation only handles standard video modes. For double scan
|
|
* and interlaced modes the driver is supposed to adjust the hardware mode
|
|
* (taken from &drm_crtc_state.adjusted mode for atomic modeset drivers) to
|
|
* match the scanout position reported.
|
|
*
|
|
* Note that atomic drivers must call drm_calc_timestamping_constants() before
|
|
* enabling a CRTC. The atomic helpers already take care of that in
|
|
* drm_atomic_helper_update_legacy_modeset_state().
|
|
*
|
|
* Returns:
|
|
*
|
|
* Returns true on success, and false on failure, i.e. when no accurate
|
|
* timestamp could be acquired.
|
|
*/
|
|
bool drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
|
|
unsigned int pipe,
|
|
int *max_error,
|
|
ktime_t *vblank_time,
|
|
bool in_vblank_irq)
|
|
{
|
|
struct timespec64 ts_etime, ts_vblank_time;
|
|
ktime_t stime, etime;
|
|
bool vbl_status;
|
|
struct drm_crtc *crtc;
|
|
const struct drm_display_mode *mode;
|
|
struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
|
|
int vpos, hpos, i;
|
|
int delta_ns, duration_ns;
|
|
|
|
if (!drm_core_check_feature(dev, DRIVER_MODESET))
|
|
return false;
|
|
|
|
crtc = drm_crtc_from_index(dev, pipe);
|
|
|
|
if (pipe >= dev->num_crtcs || !crtc) {
|
|
DRM_ERROR("Invalid crtc %u\n", pipe);
|
|
return false;
|
|
}
|
|
|
|
/* Scanout position query not supported? Should not happen. */
|
|
if (!dev->driver->get_scanout_position) {
|
|
DRM_ERROR("Called from driver w/o get_scanout_position()!?\n");
|
|
return false;
|
|
}
|
|
|
|
if (drm_drv_uses_atomic_modeset(dev))
|
|
mode = &vblank->hwmode;
|
|
else
|
|
mode = &crtc->hwmode;
|
|
|
|
/* If mode timing undefined, just return as no-op:
|
|
* Happens during initial modesetting of a crtc.
|
|
*/
|
|
if (mode->crtc_clock == 0) {
|
|
DRM_DEBUG("crtc %u: Noop due to uninitialized mode.\n", pipe);
|
|
WARN_ON_ONCE(drm_drv_uses_atomic_modeset(dev));
|
|
|
|
return false;
|
|
}
|
|
|
|
/* Get current scanout position with system timestamp.
|
|
* Repeat query up to DRM_TIMESTAMP_MAXRETRIES times
|
|
* if single query takes longer than max_error nanoseconds.
|
|
*
|
|
* This guarantees a tight bound on maximum error if
|
|
* code gets preempted or delayed for some reason.
|
|
*/
|
|
for (i = 0; i < DRM_TIMESTAMP_MAXRETRIES; i++) {
|
|
/*
|
|
* Get vertical and horizontal scanout position vpos, hpos,
|
|
* and bounding timestamps stime, etime, pre/post query.
|
|
*/
|
|
vbl_status = dev->driver->get_scanout_position(dev, pipe,
|
|
in_vblank_irq,
|
|
&vpos, &hpos,
|
|
&stime, &etime,
|
|
mode);
|
|
|
|
/* Return as no-op if scanout query unsupported or failed. */
|
|
if (!vbl_status) {
|
|
DRM_DEBUG("crtc %u : scanoutpos query failed.\n",
|
|
pipe);
|
|
return false;
|
|
}
|
|
|
|
/* Compute uncertainty in timestamp of scanout position query. */
|
|
duration_ns = ktime_to_ns(etime) - ktime_to_ns(stime);
|
|
|
|
/* Accept result with < max_error nsecs timing uncertainty. */
|
|
if (duration_ns <= *max_error)
|
|
break;
|
|
}
|
|
|
|
/* Noisy system timing? */
|
|
if (i == DRM_TIMESTAMP_MAXRETRIES) {
|
|
DRM_DEBUG("crtc %u: Noisy timestamp %d us > %d us [%d reps].\n",
|
|
pipe, duration_ns/1000, *max_error/1000, i);
|
|
}
|
|
|
|
/* Return upper bound of timestamp precision error. */
|
|
*max_error = duration_ns;
|
|
|
|
/* Convert scanout position into elapsed time at raw_time query
|
|
* since start of scanout at first display scanline. delta_ns
|
|
* can be negative if start of scanout hasn't happened yet.
|
|
*/
|
|
delta_ns = div_s64(1000000LL * (vpos * mode->crtc_htotal + hpos),
|
|
mode->crtc_clock);
|
|
|
|
/* Subtract time delta from raw timestamp to get final
|
|
* vblank_time timestamp for end of vblank.
|
|
*/
|
|
*vblank_time = ktime_sub_ns(etime, delta_ns);
|
|
|
|
if ((drm_debug & DRM_UT_VBL) == 0)
|
|
return true;
|
|
|
|
ts_etime = ktime_to_timespec64(etime);
|
|
ts_vblank_time = ktime_to_timespec64(*vblank_time);
|
|
|
|
DRM_DEBUG_VBL("crtc %u : v p(%d,%d)@ %lld.%06ld -> %lld.%06ld [e %d us, %d rep]\n",
|
|
pipe, hpos, vpos,
|
|
(u64)ts_etime.tv_sec, ts_etime.tv_nsec / 1000,
|
|
(u64)ts_vblank_time.tv_sec, ts_vblank_time.tv_nsec / 1000,
|
|
duration_ns / 1000, i);
|
|
|
|
return true;
|
|
}
|
|
EXPORT_SYMBOL(drm_calc_vbltimestamp_from_scanoutpos);
|
|
|
|
/**
|
|
* drm_get_last_vbltimestamp - retrieve raw timestamp for the most recent
|
|
* vblank interval
|
|
* @dev: DRM device
|
|
* @pipe: index of CRTC whose vblank timestamp to retrieve
|
|
* @tvblank: Pointer to target time which should receive the timestamp
|
|
* @in_vblank_irq:
|
|
* True when called from drm_crtc_handle_vblank(). Some drivers
|
|
* need to apply some workarounds for gpu-specific vblank irq quirks
|
|
* if flag is set.
|
|
*
|
|
* Fetches the system timestamp corresponding to the time of the most recent
|
|
* vblank interval on specified CRTC. May call into kms-driver to
|
|
* compute the timestamp with a high-precision GPU specific method.
|
|
*
|
|
* Returns zero if timestamp originates from uncorrected do_gettimeofday()
|
|
* call, i.e., it isn't very precisely locked to the true vblank.
|
|
*
|
|
* Returns:
|
|
* True if timestamp is considered to be very precise, false otherwise.
|
|
*/
|
|
static bool
|
|
drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe,
|
|
ktime_t *tvblank, bool in_vblank_irq)
|
|
{
|
|
bool ret = false;
|
|
|
|
/* Define requested maximum error on timestamps (nanoseconds). */
|
|
int max_error = (int) drm_timestamp_precision * 1000;
|
|
|
|
/* Query driver if possible and precision timestamping enabled. */
|
|
if (dev->driver->get_vblank_timestamp && (max_error > 0))
|
|
ret = dev->driver->get_vblank_timestamp(dev, pipe, &max_error,
|
|
tvblank, in_vblank_irq);
|
|
|
|
/* GPU high precision timestamp query unsupported or failed.
|
|
* Return current monotonic/gettimeofday timestamp as best estimate.
|
|
*/
|
|
if (!ret)
|
|
*tvblank = ktime_get();
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* drm_crtc_vblank_count - retrieve "cooked" vblank counter value
|
|
* @crtc: which counter to retrieve
|
|
*
|
|
* Fetches the "cooked" vblank count value that represents the number of
|
|
* vblank events since the system was booted, including lost events due to
|
|
* modesetting activity. Note that this timer isn't correct against a racing
|
|
* vblank interrupt (since it only reports the software vblank counter), see
|
|
* drm_crtc_accurate_vblank_count() for such use-cases.
|
|
*
|
|
* Returns:
|
|
* The software vblank counter.
|
|
*/
|
|
u64 drm_crtc_vblank_count(struct drm_crtc *crtc)
|
|
{
|
|
return drm_vblank_count(crtc->dev, drm_crtc_index(crtc));
|
|
}
|
|
EXPORT_SYMBOL(drm_crtc_vblank_count);
|
|
|
|
/**
|
|
* drm_vblank_count_and_time - retrieve "cooked" vblank counter value and the
|
|
* system timestamp corresponding to that vblank counter value.
|
|
* @dev: DRM device
|
|
* @pipe: index of CRTC whose counter to retrieve
|
|
* @vblanktime: Pointer to ktime_t to receive the vblank timestamp.
|
|
*
|
|
* Fetches the "cooked" vblank count value that represents the number of
|
|
* vblank events since the system was booted, including lost events due to
|
|
* modesetting activity. Returns corresponding system timestamp of the time
|
|
* of the vblank interval that corresponds to the current vblank counter value.
|
|
*
|
|
* This is the legacy version of drm_crtc_vblank_count_and_time().
|
|
*/
|
|
static u64 drm_vblank_count_and_time(struct drm_device *dev, unsigned int pipe,
|
|
ktime_t *vblanktime)
|
|
{
|
|
struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
|
|
u64 vblank_count;
|
|
unsigned int seq;
|
|
|
|
if (WARN_ON(pipe >= dev->num_crtcs)) {
|
|
*vblanktime = 0;
|
|
return 0;
|
|
}
|
|
|
|
do {
|
|
seq = read_seqbegin(&vblank->seqlock);
|
|
vblank_count = vblank->count;
|
|
*vblanktime = vblank->time;
|
|
} while (read_seqretry(&vblank->seqlock, seq));
|
|
|
|
return vblank_count;
|
|
}
|
|
|
|
/**
|
|
* drm_crtc_vblank_count_and_time - retrieve "cooked" vblank counter value
|
|
* and the system timestamp corresponding to that vblank counter value
|
|
* @crtc: which counter to retrieve
|
|
* @vblanktime: Pointer to time to receive the vblank timestamp.
|
|
*
|
|
* Fetches the "cooked" vblank count value that represents the number of
|
|
* vblank events since the system was booted, including lost events due to
|
|
* modesetting activity. Returns corresponding system timestamp of the time
|
|
* of the vblank interval that corresponds to the current vblank counter value.
|
|
*/
|
|
u64 drm_crtc_vblank_count_and_time(struct drm_crtc *crtc,
|
|
ktime_t *vblanktime)
|
|
{
|
|
return drm_vblank_count_and_time(crtc->dev, drm_crtc_index(crtc),
|
|
vblanktime);
|
|
}
|
|
EXPORT_SYMBOL(drm_crtc_vblank_count_and_time);
|
|
|
|
static void send_vblank_event(struct drm_device *dev,
|
|
struct drm_pending_vblank_event *e,
|
|
u64 seq, ktime_t now)
|
|
{
|
|
struct timespec64 tv;
|
|
|
|
switch (e->event.base.type) {
|
|
case DRM_EVENT_VBLANK:
|
|
case DRM_EVENT_FLIP_COMPLETE:
|
|
tv = ktime_to_timespec64(now);
|
|
e->event.vbl.sequence = seq;
|
|
/*
|
|
* e->event is a user space structure, with hardcoded unsigned
|
|
* 32-bit seconds/microseconds. This is safe as we always use
|
|
* monotonic timestamps since linux-4.15
|
|
*/
|
|
e->event.vbl.tv_sec = tv.tv_sec;
|
|
e->event.vbl.tv_usec = tv.tv_nsec / 1000;
|
|
break;
|
|
case DRM_EVENT_CRTC_SEQUENCE:
|
|
if (seq)
|
|
e->event.seq.sequence = seq;
|
|
e->event.seq.time_ns = ktime_to_ns(now);
|
|
break;
|
|
}
|
|
trace_drm_vblank_event_delivered(e->base.file_priv, e->pipe, seq);
|
|
drm_send_event_locked(dev, &e->base);
|
|
}
|
|
|
|
/**
|
|
* drm_crtc_arm_vblank_event - arm vblank event after pageflip
|
|
* @crtc: the source CRTC of the vblank event
|
|
* @e: the event to send
|
|
*
|
|
* A lot of drivers need to generate vblank events for the very next vblank
|
|
* interrupt. For example when the page flip interrupt happens when the page
|
|
* flip gets armed, but not when it actually executes within the next vblank
|
|
* period. This helper function implements exactly the required vblank arming
|
|
* behaviour.
|
|
*
|
|
* NOTE: Drivers using this to send out the &drm_crtc_state.event as part of an
|
|
* atomic commit must ensure that the next vblank happens at exactly the same
|
|
* time as the atomic commit is committed to the hardware. This function itself
|
|
* does **not** protect against the next vblank interrupt racing with either this
|
|
* function call or the atomic commit operation. A possible sequence could be:
|
|
*
|
|
* 1. Driver commits new hardware state into vblank-synchronized registers.
|
|
* 2. A vblank happens, committing the hardware state. Also the corresponding
|
|
* vblank interrupt is fired off and fully processed by the interrupt
|
|
* handler.
|
|
* 3. The atomic commit operation proceeds to call drm_crtc_arm_vblank_event().
|
|
* 4. The event is only send out for the next vblank, which is wrong.
|
|
*
|
|
* An equivalent race can happen when the driver calls
|
|
* drm_crtc_arm_vblank_event() before writing out the new hardware state.
|
|
*
|
|
* The only way to make this work safely is to prevent the vblank from firing
|
|
* (and the hardware from committing anything else) until the entire atomic
|
|
* commit sequence has run to completion. If the hardware does not have such a
|
|
* feature (e.g. using a "go" bit), then it is unsafe to use this functions.
|
|
* Instead drivers need to manually send out the event from their interrupt
|
|
* handler by calling drm_crtc_send_vblank_event() and make sure that there's no
|
|
* possible race with the hardware committing the atomic update.
|
|
*
|
|
* Caller must hold a vblank reference for the event @e acquired by a
|
|
* drm_crtc_vblank_get(), which will be dropped when the next vblank arrives.
|
|
*/
|
|
void drm_crtc_arm_vblank_event(struct drm_crtc *crtc,
|
|
struct drm_pending_vblank_event *e)
|
|
{
|
|
struct drm_device *dev = crtc->dev;
|
|
unsigned int pipe = drm_crtc_index(crtc);
|
|
|
|
assert_spin_locked(&dev->event_lock);
|
|
|
|
e->pipe = pipe;
|
|
e->sequence = drm_crtc_accurate_vblank_count(crtc) + 1;
|
|
list_add_tail(&e->base.link, &dev->vblank_event_list);
|
|
}
|
|
EXPORT_SYMBOL(drm_crtc_arm_vblank_event);
|
|
|
|
/**
|
|
* drm_crtc_send_vblank_event - helper to send vblank event after pageflip
|
|
* @crtc: the source CRTC of the vblank event
|
|
* @e: the event to send
|
|
*
|
|
* Updates sequence # and timestamp on event for the most recently processed
|
|
* vblank, and sends it to userspace. Caller must hold event lock.
|
|
*
|
|
* See drm_crtc_arm_vblank_event() for a helper which can be used in certain
|
|
* situation, especially to send out events for atomic commit operations.
|
|
*/
|
|
void drm_crtc_send_vblank_event(struct drm_crtc *crtc,
|
|
struct drm_pending_vblank_event *e)
|
|
{
|
|
struct drm_device *dev = crtc->dev;
|
|
u64 seq;
|
|
unsigned int pipe = drm_crtc_index(crtc);
|
|
ktime_t now;
|
|
|
|
if (dev->num_crtcs > 0) {
|
|
seq = drm_vblank_count_and_time(dev, pipe, &now);
|
|
} else {
|
|
seq = 0;
|
|
|
|
now = ktime_get();
|
|
}
|
|
e->pipe = pipe;
|
|
send_vblank_event(dev, e, seq, now);
|
|
}
|
|
EXPORT_SYMBOL(drm_crtc_send_vblank_event);
|
|
|
|
static int __enable_vblank(struct drm_device *dev, unsigned int pipe)
|
|
{
|
|
if (drm_core_check_feature(dev, DRIVER_MODESET)) {
|
|
struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe);
|
|
|
|
if (WARN_ON(!crtc))
|
|
return 0;
|
|
|
|
if (crtc->funcs->enable_vblank)
|
|
return crtc->funcs->enable_vblank(crtc);
|
|
}
|
|
|
|
return dev->driver->enable_vblank(dev, pipe);
|
|
}
|
|
|
|
static int drm_vblank_enable(struct drm_device *dev, unsigned int pipe)
|
|
{
|
|
struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
|
|
int ret = 0;
|
|
|
|
assert_spin_locked(&dev->vbl_lock);
|
|
|
|
spin_lock(&dev->vblank_time_lock);
|
|
|
|
if (!vblank->enabled) {
|
|
/*
|
|
* Enable vblank irqs under vblank_time_lock protection.
|
|
* All vblank count & timestamp updates are held off
|
|
* until we are done reinitializing master counter and
|
|
* timestamps. Filtercode in drm_handle_vblank() will
|
|
* prevent double-accounting of same vblank interval.
|
|
*/
|
|
ret = __enable_vblank(dev, pipe);
|
|
DRM_DEBUG("enabling vblank on crtc %u, ret: %d\n", pipe, ret);
|
|
if (ret) {
|
|
atomic_dec(&vblank->refcount);
|
|
} else {
|
|
drm_update_vblank_count(dev, pipe, 0);
|
|
/* drm_update_vblank_count() includes a wmb so we just
|
|
* need to ensure that the compiler emits the write
|
|
* to mark the vblank as enabled after the call
|
|
* to drm_update_vblank_count().
|
|
*/
|
|
WRITE_ONCE(vblank->enabled, true);
|
|
}
|
|
}
|
|
|
|
spin_unlock(&dev->vblank_time_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int drm_vblank_get(struct drm_device *dev, unsigned int pipe)
|
|
{
|
|
struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
|
|
unsigned long irqflags;
|
|
int ret = 0;
|
|
|
|
if (!dev->num_crtcs)
|
|
return -EINVAL;
|
|
|
|
if (WARN_ON(pipe >= dev->num_crtcs))
|
|
return -EINVAL;
|
|
|
|
spin_lock_irqsave(&dev->vbl_lock, irqflags);
|
|
/* Going from 0->1 means we have to enable interrupts again */
|
|
if (atomic_add_return(1, &vblank->refcount) == 1) {
|
|
ret = drm_vblank_enable(dev, pipe);
|
|
} else {
|
|
if (!vblank->enabled) {
|
|
atomic_dec(&vblank->refcount);
|
|
ret = -EINVAL;
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* drm_crtc_vblank_get - get a reference count on vblank events
|
|
* @crtc: which CRTC to own
|
|
*
|
|
* Acquire a reference count on vblank events to avoid having them disabled
|
|
* while in use.
|
|
*
|
|
* Returns:
|
|
* Zero on success or a negative error code on failure.
|
|
*/
|
|
int drm_crtc_vblank_get(struct drm_crtc *crtc)
|
|
{
|
|
return drm_vblank_get(crtc->dev, drm_crtc_index(crtc));
|
|
}
|
|
EXPORT_SYMBOL(drm_crtc_vblank_get);
|
|
|
|
static void drm_vblank_put(struct drm_device *dev, unsigned int pipe)
|
|
{
|
|
struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
|
|
|
|
if (WARN_ON(pipe >= dev->num_crtcs))
|
|
return;
|
|
|
|
if (WARN_ON(atomic_read(&vblank->refcount) == 0))
|
|
return;
|
|
|
|
/* Last user schedules interrupt disable */
|
|
if (atomic_dec_and_test(&vblank->refcount)) {
|
|
if (drm_vblank_offdelay == 0)
|
|
return;
|
|
else if (drm_vblank_offdelay < 0)
|
|
vblank_disable_fn(&vblank->disable_timer);
|
|
else if (!dev->vblank_disable_immediate)
|
|
mod_timer(&vblank->disable_timer,
|
|
jiffies + ((drm_vblank_offdelay * HZ)/1000));
|
|
}
|
|
}
|
|
|
|
/**
|
|
* drm_crtc_vblank_put - give up ownership of vblank events
|
|
* @crtc: which counter to give up
|
|
*
|
|
* Release ownership of a given vblank counter, turning off interrupts
|
|
* if possible. Disable interrupts after drm_vblank_offdelay milliseconds.
|
|
*/
|
|
void drm_crtc_vblank_put(struct drm_crtc *crtc)
|
|
{
|
|
drm_vblank_put(crtc->dev, drm_crtc_index(crtc));
|
|
}
|
|
EXPORT_SYMBOL(drm_crtc_vblank_put);
|
|
|
|
/**
|
|
* drm_wait_one_vblank - wait for one vblank
|
|
* @dev: DRM device
|
|
* @pipe: CRTC index
|
|
*
|
|
* This waits for one vblank to pass on @pipe, using the irq driver interfaces.
|
|
* It is a failure to call this when the vblank irq for @pipe is disabled, e.g.
|
|
* due to lack of driver support or because the crtc is off.
|
|
*
|
|
* This is the legacy version of drm_crtc_wait_one_vblank().
|
|
*/
|
|
void drm_wait_one_vblank(struct drm_device *dev, unsigned int pipe)
|
|
{
|
|
struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
|
|
int ret;
|
|
u64 last;
|
|
|
|
if (WARN_ON(pipe >= dev->num_crtcs))
|
|
return;
|
|
|
|
ret = drm_vblank_get(dev, pipe);
|
|
if (WARN(ret, "vblank not available on crtc %i, ret=%i\n", pipe, ret))
|
|
return;
|
|
|
|
last = drm_vblank_count(dev, pipe);
|
|
|
|
ret = wait_event_timeout(vblank->queue,
|
|
last != drm_vblank_count(dev, pipe),
|
|
msecs_to_jiffies(100));
|
|
|
|
WARN(ret == 0, "vblank wait timed out on crtc %i\n", pipe);
|
|
|
|
drm_vblank_put(dev, pipe);
|
|
}
|
|
EXPORT_SYMBOL(drm_wait_one_vblank);
|
|
|
|
/**
|
|
* drm_crtc_wait_one_vblank - wait for one vblank
|
|
* @crtc: DRM crtc
|
|
*
|
|
* This waits for one vblank to pass on @crtc, using the irq driver interfaces.
|
|
* It is a failure to call this when the vblank irq for @crtc is disabled, e.g.
|
|
* due to lack of driver support or because the crtc is off.
|
|
*/
|
|
void drm_crtc_wait_one_vblank(struct drm_crtc *crtc)
|
|
{
|
|
drm_wait_one_vblank(crtc->dev, drm_crtc_index(crtc));
|
|
}
|
|
EXPORT_SYMBOL(drm_crtc_wait_one_vblank);
|
|
|
|
/**
|
|
* drm_crtc_vblank_off - disable vblank events on a CRTC
|
|
* @crtc: CRTC in question
|
|
*
|
|
* Drivers can use this function to shut down the vblank interrupt handling when
|
|
* disabling a crtc. This function ensures that the latest vblank frame count is
|
|
* stored so that drm_vblank_on can restore it again.
|
|
*
|
|
* Drivers must use this function when the hardware vblank counter can get
|
|
* reset, e.g. when suspending or disabling the @crtc in general.
|
|
*/
|
|
void drm_crtc_vblank_off(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 drm_pending_vblank_event *e, *t;
|
|
|
|
ktime_t now;
|
|
unsigned long irqflags;
|
|
u64 seq;
|
|
|
|
if (WARN_ON(pipe >= dev->num_crtcs))
|
|
return;
|
|
|
|
spin_lock_irqsave(&dev->event_lock, irqflags);
|
|
|
|
spin_lock(&dev->vbl_lock);
|
|
DRM_DEBUG_VBL("crtc %d, vblank enabled %d, inmodeset %d\n",
|
|
pipe, vblank->enabled, vblank->inmodeset);
|
|
|
|
/* Avoid redundant vblank disables without previous
|
|
* drm_crtc_vblank_on(). */
|
|
if (drm_core_check_feature(dev, DRIVER_ATOMIC) || !vblank->inmodeset)
|
|
drm_vblank_disable_and_save(dev, pipe);
|
|
|
|
wake_up(&vblank->queue);
|
|
|
|
/*
|
|
* Prevent subsequent drm_vblank_get() from re-enabling
|
|
* the vblank interrupt by bumping the refcount.
|
|
*/
|
|
if (!vblank->inmodeset) {
|
|
atomic_inc(&vblank->refcount);
|
|
vblank->inmodeset = 1;
|
|
}
|
|
spin_unlock(&dev->vbl_lock);
|
|
|
|
/* Send any queued vblank events, lest the natives grow disquiet */
|
|
seq = drm_vblank_count_and_time(dev, pipe, &now);
|
|
|
|
list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) {
|
|
if (e->pipe != pipe)
|
|
continue;
|
|
DRM_DEBUG("Sending premature vblank event on disable: "
|
|
"wanted %llu, current %llu\n",
|
|
e->sequence, seq);
|
|
list_del(&e->base.link);
|
|
drm_vblank_put(dev, pipe);
|
|
send_vblank_event(dev, e, seq, now);
|
|
}
|
|
spin_unlock_irqrestore(&dev->event_lock, irqflags);
|
|
|
|
/* Will be reset by the modeset helpers when re-enabling the crtc by
|
|
* calling drm_calc_timestamping_constants(). */
|
|
vblank->hwmode.crtc_clock = 0;
|
|
}
|
|
EXPORT_SYMBOL(drm_crtc_vblank_off);
|
|
|
|
/**
|
|
* drm_crtc_vblank_reset - reset vblank state to off on a CRTC
|
|
* @crtc: CRTC in question
|
|
*
|
|
* Drivers can use this function to reset the vblank state to off at load time.
|
|
* Drivers should use this together with the drm_crtc_vblank_off() and
|
|
* drm_crtc_vblank_on() functions. The difference compared to
|
|
* drm_crtc_vblank_off() is that this function doesn't save the vblank counter
|
|
* and hence doesn't need to call any driver hooks.
|
|
*
|
|
* This is useful for recovering driver state e.g. on driver load, or on resume.
|
|
*/
|
|
void drm_crtc_vblank_reset(struct drm_crtc *crtc)
|
|
{
|
|
struct drm_device *dev = crtc->dev;
|
|
unsigned long irqflags;
|
|
unsigned int pipe = drm_crtc_index(crtc);
|
|
struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
|
|
|
|
spin_lock_irqsave(&dev->vbl_lock, irqflags);
|
|
/*
|
|
* Prevent subsequent drm_vblank_get() from enabling the vblank
|
|
* interrupt by bumping the refcount.
|
|
*/
|
|
if (!vblank->inmodeset) {
|
|
atomic_inc(&vblank->refcount);
|
|
vblank->inmodeset = 1;
|
|
}
|
|
spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
|
|
|
|
WARN_ON(!list_empty(&dev->vblank_event_list));
|
|
}
|
|
EXPORT_SYMBOL(drm_crtc_vblank_reset);
|
|
|
|
/**
|
|
* drm_crtc_set_max_vblank_count - configure the hw max vblank counter value
|
|
* @crtc: CRTC in question
|
|
* @max_vblank_count: max hardware vblank counter value
|
|
*
|
|
* Update the maximum hardware vblank counter value for @crtc
|
|
* at runtime. Useful for hardware where the operation of the
|
|
* hardware vblank counter depends on the currently active
|
|
* display configuration.
|
|
*
|
|
* For example, if the hardware vblank counter does not work
|
|
* when a specific connector is active the maximum can be set
|
|
* to zero. And when that specific connector isn't active the
|
|
* maximum can again be set to the appropriate non-zero value.
|
|
*
|
|
* If used, must be called before drm_vblank_on().
|
|
*/
|
|
void drm_crtc_set_max_vblank_count(struct drm_crtc *crtc,
|
|
u32 max_vblank_count)
|
|
{
|
|
struct drm_device *dev = crtc->dev;
|
|
unsigned int pipe = drm_crtc_index(crtc);
|
|
struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
|
|
|
|
WARN_ON(dev->max_vblank_count);
|
|
WARN_ON(!READ_ONCE(vblank->inmodeset));
|
|
|
|
vblank->max_vblank_count = max_vblank_count;
|
|
}
|
|
EXPORT_SYMBOL(drm_crtc_set_max_vblank_count);
|
|
|
|
/**
|
|
* drm_crtc_vblank_on - enable vblank events on a CRTC
|
|
* @crtc: CRTC in question
|
|
*
|
|
* This functions restores the vblank interrupt state captured with
|
|
* drm_crtc_vblank_off() again and is generally called when enabling @crtc. Note
|
|
* that calls to drm_crtc_vblank_on() and drm_crtc_vblank_off() can be
|
|
* unbalanced and so can also be unconditionally called in driver load code to
|
|
* reflect the current hardware state of the crtc.
|
|
*/
|
|
void drm_crtc_vblank_on(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];
|
|
unsigned long irqflags;
|
|
|
|
if (WARN_ON(pipe >= dev->num_crtcs))
|
|
return;
|
|
|
|
spin_lock_irqsave(&dev->vbl_lock, irqflags);
|
|
DRM_DEBUG_VBL("crtc %d, vblank enabled %d, inmodeset %d\n",
|
|
pipe, vblank->enabled, vblank->inmodeset);
|
|
|
|
/* Drop our private "prevent drm_vblank_get" refcount */
|
|
if (vblank->inmodeset) {
|
|
atomic_dec(&vblank->refcount);
|
|
vblank->inmodeset = 0;
|
|
}
|
|
|
|
drm_reset_vblank_timestamp(dev, pipe);
|
|
|
|
/*
|
|
* re-enable interrupts if there are users left, or the
|
|
* user wishes vblank interrupts to be enabled all the time.
|
|
*/
|
|
if (atomic_read(&vblank->refcount) != 0 || drm_vblank_offdelay == 0)
|
|
WARN_ON(drm_vblank_enable(dev, pipe));
|
|
spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
|
|
}
|
|
EXPORT_SYMBOL(drm_crtc_vblank_on);
|
|
|
|
/**
|
|
* drm_vblank_restore - estimate missed vblanks and update vblank count.
|
|
* @dev: DRM device
|
|
* @pipe: CRTC index
|
|
*
|
|
* Power manamement features can cause frame counter resets between vblank
|
|
* disable and enable. Drivers can use this function in their
|
|
* &drm_crtc_funcs.enable_vblank implementation to estimate missed vblanks since
|
|
* the last &drm_crtc_funcs.disable_vblank using timestamps and update the
|
|
* vblank counter.
|
|
*
|
|
* This function is the legacy version of drm_crtc_vblank_restore().
|
|
*/
|
|
void drm_vblank_restore(struct drm_device *dev, unsigned int pipe)
|
|
{
|
|
ktime_t t_vblank;
|
|
struct drm_vblank_crtc *vblank;
|
|
int framedur_ns;
|
|
u64 diff_ns;
|
|
u32 cur_vblank, diff = 1;
|
|
int count = DRM_TIMESTAMP_MAXRETRIES;
|
|
|
|
if (WARN_ON(pipe >= dev->num_crtcs))
|
|
return;
|
|
|
|
assert_spin_locked(&dev->vbl_lock);
|
|
assert_spin_locked(&dev->vblank_time_lock);
|
|
|
|
vblank = &dev->vblank[pipe];
|
|
WARN_ONCE((drm_debug & DRM_UT_VBL) && !vblank->framedur_ns,
|
|
"Cannot compute missed vblanks without frame duration\n");
|
|
framedur_ns = vblank->framedur_ns;
|
|
|
|
do {
|
|
cur_vblank = __get_vblank_counter(dev, pipe);
|
|
drm_get_last_vbltimestamp(dev, pipe, &t_vblank, false);
|
|
} while (cur_vblank != __get_vblank_counter(dev, pipe) && --count > 0);
|
|
|
|
diff_ns = ktime_to_ns(ktime_sub(t_vblank, vblank->time));
|
|
if (framedur_ns)
|
|
diff = DIV_ROUND_CLOSEST_ULL(diff_ns, framedur_ns);
|
|
|
|
|
|
DRM_DEBUG_VBL("missed %d vblanks in %lld ns, frame duration=%d ns, hw_diff=%d\n",
|
|
diff, diff_ns, framedur_ns, cur_vblank - vblank->last);
|
|
store_vblank(dev, pipe, diff, t_vblank, cur_vblank);
|
|
}
|
|
EXPORT_SYMBOL(drm_vblank_restore);
|
|
|
|
/**
|
|
* drm_crtc_vblank_restore - estimate missed vblanks and update vblank count.
|
|
* @crtc: CRTC in question
|
|
*
|
|
* Power manamement features can cause frame counter resets between vblank
|
|
* disable and enable. Drivers can use this function in their
|
|
* &drm_crtc_funcs.enable_vblank implementation to estimate missed vblanks since
|
|
* the last &drm_crtc_funcs.disable_vblank using timestamps and update the
|
|
* vblank counter.
|
|
*/
|
|
void drm_crtc_vblank_restore(struct drm_crtc *crtc)
|
|
{
|
|
drm_vblank_restore(crtc->dev, drm_crtc_index(crtc));
|
|
}
|
|
EXPORT_SYMBOL(drm_crtc_vblank_restore);
|
|
|
|
static void drm_legacy_vblank_pre_modeset(struct drm_device *dev,
|
|
unsigned int pipe)
|
|
{
|
|
struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
|
|
|
|
/* vblank is not initialized (IRQ not installed ?), or has been freed */
|
|
if (!dev->num_crtcs)
|
|
return;
|
|
|
|
if (WARN_ON(pipe >= dev->num_crtcs))
|
|
return;
|
|
|
|
/*
|
|
* To avoid all the problems that might happen if interrupts
|
|
* were enabled/disabled around or between these calls, we just
|
|
* have the kernel take a reference on the CRTC (just once though
|
|
* to avoid corrupting the count if multiple, mismatch calls occur),
|
|
* so that interrupts remain enabled in the interim.
|
|
*/
|
|
if (!vblank->inmodeset) {
|
|
vblank->inmodeset = 0x1;
|
|
if (drm_vblank_get(dev, pipe) == 0)
|
|
vblank->inmodeset |= 0x2;
|
|
}
|
|
}
|
|
|
|
static void drm_legacy_vblank_post_modeset(struct drm_device *dev,
|
|
unsigned int pipe)
|
|
{
|
|
struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
|
|
unsigned long irqflags;
|
|
|
|
/* vblank is not initialized (IRQ not installed ?), or has been freed */
|
|
if (!dev->num_crtcs)
|
|
return;
|
|
|
|
if (WARN_ON(pipe >= dev->num_crtcs))
|
|
return;
|
|
|
|
if (vblank->inmodeset) {
|
|
spin_lock_irqsave(&dev->vbl_lock, irqflags);
|
|
drm_reset_vblank_timestamp(dev, pipe);
|
|
spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
|
|
|
|
if (vblank->inmodeset & 0x2)
|
|
drm_vblank_put(dev, pipe);
|
|
|
|
vblank->inmodeset = 0;
|
|
}
|
|
}
|
|
|
|
int drm_legacy_modeset_ctl_ioctl(struct drm_device *dev, void *data,
|
|
struct drm_file *file_priv)
|
|
{
|
|
struct drm_modeset_ctl *modeset = data;
|
|
unsigned int pipe;
|
|
|
|
/* If drm_vblank_init() hasn't been called yet, just no-op */
|
|
if (!dev->num_crtcs)
|
|
return 0;
|
|
|
|
/* KMS drivers handle this internally */
|
|
if (!drm_core_check_feature(dev, DRIVER_LEGACY))
|
|
return 0;
|
|
|
|
pipe = modeset->crtc;
|
|
if (pipe >= dev->num_crtcs)
|
|
return -EINVAL;
|
|
|
|
switch (modeset->cmd) {
|
|
case _DRM_PRE_MODESET:
|
|
drm_legacy_vblank_pre_modeset(dev, pipe);
|
|
break;
|
|
case _DRM_POST_MODESET:
|
|
drm_legacy_vblank_post_modeset(dev, pipe);
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline bool vblank_passed(u64 seq, u64 ref)
|
|
{
|
|
return (seq - ref) <= (1 << 23);
|
|
}
|
|
|
|
static int drm_queue_vblank_event(struct drm_device *dev, unsigned int pipe,
|
|
u64 req_seq,
|
|
union drm_wait_vblank *vblwait,
|
|
struct drm_file *file_priv)
|
|
{
|
|
struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
|
|
struct drm_pending_vblank_event *e;
|
|
ktime_t now;
|
|
unsigned long flags;
|
|
u64 seq;
|
|
int ret;
|
|
|
|
e = kzalloc(sizeof(*e), GFP_KERNEL);
|
|
if (e == NULL) {
|
|
ret = -ENOMEM;
|
|
goto err_put;
|
|
}
|
|
|
|
e->pipe = pipe;
|
|
e->event.base.type = DRM_EVENT_VBLANK;
|
|
e->event.base.length = sizeof(e->event.vbl);
|
|
e->event.vbl.user_data = vblwait->request.signal;
|
|
e->event.vbl.crtc_id = 0;
|
|
if (drm_core_check_feature(dev, DRIVER_MODESET)) {
|
|
struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe);
|
|
if (crtc)
|
|
e->event.vbl.crtc_id = crtc->base.id;
|
|
}
|
|
|
|
spin_lock_irqsave(&dev->event_lock, flags);
|
|
|
|
/*
|
|
* drm_crtc_vblank_off() might have been called after we called
|
|
* drm_vblank_get(). drm_crtc_vblank_off() holds event_lock around the
|
|
* vblank disable, so no need for further locking. The reference from
|
|
* drm_vblank_get() protects against vblank disable from another source.
|
|
*/
|
|
if (!READ_ONCE(vblank->enabled)) {
|
|
ret = -EINVAL;
|
|
goto err_unlock;
|
|
}
|
|
|
|
ret = drm_event_reserve_init_locked(dev, file_priv, &e->base,
|
|
&e->event.base);
|
|
|
|
if (ret)
|
|
goto err_unlock;
|
|
|
|
seq = drm_vblank_count_and_time(dev, pipe, &now);
|
|
|
|
DRM_DEBUG("event on vblank count %llu, current %llu, crtc %u\n",
|
|
req_seq, seq, pipe);
|
|
|
|
trace_drm_vblank_event_queued(file_priv, pipe, req_seq);
|
|
|
|
e->sequence = req_seq;
|
|
if (vblank_passed(seq, req_seq)) {
|
|
drm_vblank_put(dev, pipe);
|
|
send_vblank_event(dev, e, seq, now);
|
|
vblwait->reply.sequence = seq;
|
|
} else {
|
|
/* drm_handle_vblank_events will call drm_vblank_put */
|
|
list_add_tail(&e->base.link, &dev->vblank_event_list);
|
|
vblwait->reply.sequence = req_seq;
|
|
}
|
|
|
|
spin_unlock_irqrestore(&dev->event_lock, flags);
|
|
|
|
return 0;
|
|
|
|
err_unlock:
|
|
spin_unlock_irqrestore(&dev->event_lock, flags);
|
|
kfree(e);
|
|
err_put:
|
|
drm_vblank_put(dev, pipe);
|
|
return ret;
|
|
}
|
|
|
|
static bool drm_wait_vblank_is_query(union drm_wait_vblank *vblwait)
|
|
{
|
|
if (vblwait->request.sequence)
|
|
return false;
|
|
|
|
return _DRM_VBLANK_RELATIVE ==
|
|
(vblwait->request.type & (_DRM_VBLANK_TYPES_MASK |
|
|
_DRM_VBLANK_EVENT |
|
|
_DRM_VBLANK_NEXTONMISS));
|
|
}
|
|
|
|
/*
|
|
* Widen a 32-bit param to 64-bits.
|
|
*
|
|
* \param narrow 32-bit value (missing upper 32 bits)
|
|
* \param near 64-bit value that should be 'close' to near
|
|
*
|
|
* This function returns a 64-bit value using the lower 32-bits from
|
|
* 'narrow' and constructing the upper 32-bits so that the result is
|
|
* as close as possible to 'near'.
|
|
*/
|
|
|
|
static u64 widen_32_to_64(u32 narrow, u64 near)
|
|
{
|
|
return near + (s32) (narrow - near);
|
|
}
|
|
|
|
static void drm_wait_vblank_reply(struct drm_device *dev, unsigned int pipe,
|
|
struct drm_wait_vblank_reply *reply)
|
|
{
|
|
ktime_t now;
|
|
struct timespec64 ts;
|
|
|
|
/*
|
|
* drm_wait_vblank_reply is a UAPI structure that uses 'long'
|
|
* to store the seconds. This is safe as we always use monotonic
|
|
* timestamps since linux-4.15.
|
|
*/
|
|
reply->sequence = drm_vblank_count_and_time(dev, pipe, &now);
|
|
ts = ktime_to_timespec64(now);
|
|
reply->tval_sec = (u32)ts.tv_sec;
|
|
reply->tval_usec = ts.tv_nsec / 1000;
|
|
}
|
|
|
|
int drm_wait_vblank_ioctl(struct drm_device *dev, void *data,
|
|
struct drm_file *file_priv)
|
|
{
|
|
struct drm_crtc *crtc;
|
|
struct drm_vblank_crtc *vblank;
|
|
union drm_wait_vblank *vblwait = data;
|
|
int ret;
|
|
u64 req_seq, seq;
|
|
unsigned int pipe_index;
|
|
unsigned int flags, pipe, high_pipe;
|
|
|
|
if (!dev->irq_enabled)
|
|
return -EINVAL;
|
|
|
|
if (vblwait->request.type & _DRM_VBLANK_SIGNAL)
|
|
return -EINVAL;
|
|
|
|
if (vblwait->request.type &
|
|
~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK |
|
|
_DRM_VBLANK_HIGH_CRTC_MASK)) {
|
|
DRM_DEBUG("Unsupported type value 0x%x, supported mask 0x%x\n",
|
|
vblwait->request.type,
|
|
(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK |
|
|
_DRM_VBLANK_HIGH_CRTC_MASK));
|
|
return -EINVAL;
|
|
}
|
|
|
|
flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK;
|
|
high_pipe = (vblwait->request.type & _DRM_VBLANK_HIGH_CRTC_MASK);
|
|
if (high_pipe)
|
|
pipe_index = high_pipe >> _DRM_VBLANK_HIGH_CRTC_SHIFT;
|
|
else
|
|
pipe_index = flags & _DRM_VBLANK_SECONDARY ? 1 : 0;
|
|
|
|
/* Convert lease-relative crtc index into global crtc index */
|
|
if (drm_core_check_feature(dev, DRIVER_MODESET)) {
|
|
pipe = 0;
|
|
drm_for_each_crtc(crtc, dev) {
|
|
if (drm_lease_held(file_priv, crtc->base.id)) {
|
|
if (pipe_index == 0)
|
|
break;
|
|
pipe_index--;
|
|
}
|
|
pipe++;
|
|
}
|
|
} else {
|
|
pipe = pipe_index;
|
|
}
|
|
|
|
if (pipe >= dev->num_crtcs)
|
|
return -EINVAL;
|
|
|
|
vblank = &dev->vblank[pipe];
|
|
|
|
/* If the counter is currently enabled and accurate, short-circuit
|
|
* queries to return the cached timestamp of the last vblank.
|
|
*/
|
|
if (dev->vblank_disable_immediate &&
|
|
drm_wait_vblank_is_query(vblwait) &&
|
|
READ_ONCE(vblank->enabled)) {
|
|
drm_wait_vblank_reply(dev, pipe, &vblwait->reply);
|
|
return 0;
|
|
}
|
|
|
|
ret = drm_vblank_get(dev, pipe);
|
|
if (ret) {
|
|
DRM_DEBUG("crtc %d failed to acquire vblank counter, %d\n", pipe, ret);
|
|
return ret;
|
|
}
|
|
seq = drm_vblank_count(dev, pipe);
|
|
|
|
switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) {
|
|
case _DRM_VBLANK_RELATIVE:
|
|
req_seq = seq + vblwait->request.sequence;
|
|
vblwait->request.sequence = req_seq;
|
|
vblwait->request.type &= ~_DRM_VBLANK_RELATIVE;
|
|
break;
|
|
case _DRM_VBLANK_ABSOLUTE:
|
|
req_seq = widen_32_to_64(vblwait->request.sequence, seq);
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
goto done;
|
|
}
|
|
|
|
if ((flags & _DRM_VBLANK_NEXTONMISS) &&
|
|
vblank_passed(seq, req_seq)) {
|
|
req_seq = seq + 1;
|
|
vblwait->request.type &= ~_DRM_VBLANK_NEXTONMISS;
|
|
vblwait->request.sequence = req_seq;
|
|
}
|
|
|
|
if (flags & _DRM_VBLANK_EVENT) {
|
|
/* must hold on to the vblank ref until the event fires
|
|
* drm_vblank_put will be called asynchronously
|
|
*/
|
|
return drm_queue_vblank_event(dev, pipe, req_seq, vblwait, file_priv);
|
|
}
|
|
|
|
if (req_seq != seq) {
|
|
DRM_DEBUG("waiting on vblank count %llu, crtc %u\n",
|
|
req_seq, pipe);
|
|
DRM_WAIT_ON(ret, vblank->queue, 3 * HZ,
|
|
vblank_passed(drm_vblank_count(dev, pipe),
|
|
req_seq) ||
|
|
!READ_ONCE(vblank->enabled));
|
|
}
|
|
|
|
if (ret != -EINTR) {
|
|
drm_wait_vblank_reply(dev, pipe, &vblwait->reply);
|
|
|
|
DRM_DEBUG("crtc %d returning %u to client\n",
|
|
pipe, vblwait->reply.sequence);
|
|
} else {
|
|
DRM_DEBUG("crtc %d vblank wait interrupted by signal\n", pipe);
|
|
}
|
|
|
|
done:
|
|
drm_vblank_put(dev, pipe);
|
|
return ret;
|
|
}
|
|
|
|
static void drm_handle_vblank_events(struct drm_device *dev, unsigned int pipe)
|
|
{
|
|
struct drm_pending_vblank_event *e, *t;
|
|
ktime_t now;
|
|
u64 seq;
|
|
|
|
assert_spin_locked(&dev->event_lock);
|
|
|
|
seq = drm_vblank_count_and_time(dev, pipe, &now);
|
|
|
|
list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) {
|
|
if (e->pipe != pipe)
|
|
continue;
|
|
if (!vblank_passed(seq, e->sequence))
|
|
continue;
|
|
|
|
DRM_DEBUG("vblank event on %llu, current %llu\n",
|
|
e->sequence, seq);
|
|
|
|
list_del(&e->base.link);
|
|
drm_vblank_put(dev, pipe);
|
|
send_vblank_event(dev, e, seq, now);
|
|
}
|
|
|
|
trace_drm_vblank_event(pipe, seq);
|
|
}
|
|
|
|
/**
|
|
* drm_handle_vblank - handle a vblank event
|
|
* @dev: DRM device
|
|
* @pipe: index of CRTC where this event occurred
|
|
*
|
|
* Drivers should call this routine in their vblank interrupt handlers to
|
|
* update the vblank counter and send any signals that may be pending.
|
|
*
|
|
* This is the legacy version of drm_crtc_handle_vblank().
|
|
*/
|
|
bool drm_handle_vblank(struct drm_device *dev, unsigned int pipe)
|
|
{
|
|
struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
|
|
unsigned long irqflags;
|
|
bool disable_irq;
|
|
|
|
if (WARN_ON_ONCE(!dev->num_crtcs))
|
|
return false;
|
|
|
|
if (WARN_ON(pipe >= dev->num_crtcs))
|
|
return false;
|
|
|
|
spin_lock_irqsave(&dev->event_lock, irqflags);
|
|
|
|
/* Need timestamp lock to prevent concurrent execution with
|
|
* vblank enable/disable, as this would cause inconsistent
|
|
* or corrupted timestamps and vblank counts.
|
|
*/
|
|
spin_lock(&dev->vblank_time_lock);
|
|
|
|
/* Vblank irq handling disabled. Nothing to do. */
|
|
if (!vblank->enabled) {
|
|
spin_unlock(&dev->vblank_time_lock);
|
|
spin_unlock_irqrestore(&dev->event_lock, irqflags);
|
|
return false;
|
|
}
|
|
|
|
drm_update_vblank_count(dev, pipe, true);
|
|
|
|
spin_unlock(&dev->vblank_time_lock);
|
|
|
|
wake_up(&vblank->queue);
|
|
|
|
/* With instant-off, we defer disabling the interrupt until after
|
|
* we finish processing the following vblank after all events have
|
|
* been signaled. The disable has to be last (after
|
|
* drm_handle_vblank_events) so that the timestamp is always accurate.
|
|
*/
|
|
disable_irq = (dev->vblank_disable_immediate &&
|
|
drm_vblank_offdelay > 0 &&
|
|
!atomic_read(&vblank->refcount));
|
|
|
|
drm_handle_vblank_events(dev, pipe);
|
|
|
|
spin_unlock_irqrestore(&dev->event_lock, irqflags);
|
|
|
|
if (disable_irq)
|
|
vblank_disable_fn(&vblank->disable_timer);
|
|
|
|
return true;
|
|
}
|
|
EXPORT_SYMBOL(drm_handle_vblank);
|
|
|
|
/**
|
|
* drm_crtc_handle_vblank - handle a vblank event
|
|
* @crtc: where this event occurred
|
|
*
|
|
* Drivers should call this routine in their vblank interrupt handlers to
|
|
* update the vblank counter and send any signals that may be pending.
|
|
*
|
|
* This is the native KMS version of drm_handle_vblank().
|
|
*
|
|
* Returns:
|
|
* True if the event was successfully handled, false on failure.
|
|
*/
|
|
bool drm_crtc_handle_vblank(struct drm_crtc *crtc)
|
|
{
|
|
return drm_handle_vblank(crtc->dev, drm_crtc_index(crtc));
|
|
}
|
|
EXPORT_SYMBOL(drm_crtc_handle_vblank);
|
|
|
|
/*
|
|
* Get crtc VBLANK count.
|
|
*
|
|
* \param dev DRM device
|
|
* \param data user arguement, pointing to a drm_crtc_get_sequence structure.
|
|
* \param file_priv drm file private for the user's open file descriptor
|
|
*/
|
|
|
|
int drm_crtc_get_sequence_ioctl(struct drm_device *dev, void *data,
|
|
struct drm_file *file_priv)
|
|
{
|
|
struct drm_crtc *crtc;
|
|
struct drm_vblank_crtc *vblank;
|
|
int pipe;
|
|
struct drm_crtc_get_sequence *get_seq = data;
|
|
ktime_t now;
|
|
bool vblank_enabled;
|
|
int ret;
|
|
|
|
if (!drm_core_check_feature(dev, DRIVER_MODESET))
|
|
return -EOPNOTSUPP;
|
|
|
|
if (!dev->irq_enabled)
|
|
return -EINVAL;
|
|
|
|
crtc = drm_crtc_find(dev, file_priv, get_seq->crtc_id);
|
|
if (!crtc)
|
|
return -ENOENT;
|
|
|
|
pipe = drm_crtc_index(crtc);
|
|
|
|
vblank = &dev->vblank[pipe];
|
|
vblank_enabled = dev->vblank_disable_immediate && READ_ONCE(vblank->enabled);
|
|
|
|
if (!vblank_enabled) {
|
|
ret = drm_crtc_vblank_get(crtc);
|
|
if (ret) {
|
|
DRM_DEBUG("crtc %d failed to acquire vblank counter, %d\n", pipe, ret);
|
|
return ret;
|
|
}
|
|
}
|
|
drm_modeset_lock(&crtc->mutex, NULL);
|
|
if (crtc->state)
|
|
get_seq->active = crtc->state->enable;
|
|
else
|
|
get_seq->active = crtc->enabled;
|
|
drm_modeset_unlock(&crtc->mutex);
|
|
get_seq->sequence = drm_vblank_count_and_time(dev, pipe, &now);
|
|
get_seq->sequence_ns = ktime_to_ns(now);
|
|
if (!vblank_enabled)
|
|
drm_crtc_vblank_put(crtc);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Queue a event for VBLANK sequence
|
|
*
|
|
* \param dev DRM device
|
|
* \param data user arguement, pointing to a drm_crtc_queue_sequence structure.
|
|
* \param file_priv drm file private for the user's open file descriptor
|
|
*/
|
|
|
|
int drm_crtc_queue_sequence_ioctl(struct drm_device *dev, void *data,
|
|
struct drm_file *file_priv)
|
|
{
|
|
struct drm_crtc *crtc;
|
|
struct drm_vblank_crtc *vblank;
|
|
int pipe;
|
|
struct drm_crtc_queue_sequence *queue_seq = data;
|
|
ktime_t now;
|
|
struct drm_pending_vblank_event *e;
|
|
u32 flags;
|
|
u64 seq;
|
|
u64 req_seq;
|
|
int ret;
|
|
unsigned long spin_flags;
|
|
|
|
if (!drm_core_check_feature(dev, DRIVER_MODESET))
|
|
return -EOPNOTSUPP;
|
|
|
|
if (!dev->irq_enabled)
|
|
return -EINVAL;
|
|
|
|
crtc = drm_crtc_find(dev, file_priv, queue_seq->crtc_id);
|
|
if (!crtc)
|
|
return -ENOENT;
|
|
|
|
flags = queue_seq->flags;
|
|
/* Check valid flag bits */
|
|
if (flags & ~(DRM_CRTC_SEQUENCE_RELATIVE|
|
|
DRM_CRTC_SEQUENCE_NEXT_ON_MISS))
|
|
return -EINVAL;
|
|
|
|
pipe = drm_crtc_index(crtc);
|
|
|
|
vblank = &dev->vblank[pipe];
|
|
|
|
e = kzalloc(sizeof(*e), GFP_KERNEL);
|
|
if (e == NULL)
|
|
return -ENOMEM;
|
|
|
|
ret = drm_crtc_vblank_get(crtc);
|
|
if (ret) {
|
|
DRM_DEBUG("crtc %d failed to acquire vblank counter, %d\n", pipe, ret);
|
|
goto err_free;
|
|
}
|
|
|
|
seq = drm_vblank_count_and_time(dev, pipe, &now);
|
|
req_seq = queue_seq->sequence;
|
|
|
|
if (flags & DRM_CRTC_SEQUENCE_RELATIVE)
|
|
req_seq += seq;
|
|
|
|
if ((flags & DRM_CRTC_SEQUENCE_NEXT_ON_MISS) && vblank_passed(seq, req_seq))
|
|
req_seq = seq + 1;
|
|
|
|
e->pipe = pipe;
|
|
e->event.base.type = DRM_EVENT_CRTC_SEQUENCE;
|
|
e->event.base.length = sizeof(e->event.seq);
|
|
e->event.seq.user_data = queue_seq->user_data;
|
|
|
|
spin_lock_irqsave(&dev->event_lock, spin_flags);
|
|
|
|
/*
|
|
* drm_crtc_vblank_off() might have been called after we called
|
|
* drm_crtc_vblank_get(). drm_crtc_vblank_off() holds event_lock around the
|
|
* vblank disable, so no need for further locking. The reference from
|
|
* drm_crtc_vblank_get() protects against vblank disable from another source.
|
|
*/
|
|
if (!READ_ONCE(vblank->enabled)) {
|
|
ret = -EINVAL;
|
|
goto err_unlock;
|
|
}
|
|
|
|
ret = drm_event_reserve_init_locked(dev, file_priv, &e->base,
|
|
&e->event.base);
|
|
|
|
if (ret)
|
|
goto err_unlock;
|
|
|
|
e->sequence = req_seq;
|
|
|
|
if (vblank_passed(seq, req_seq)) {
|
|
drm_crtc_vblank_put(crtc);
|
|
send_vblank_event(dev, e, seq, now);
|
|
queue_seq->sequence = seq;
|
|
} else {
|
|
/* drm_handle_vblank_events will call drm_vblank_put */
|
|
list_add_tail(&e->base.link, &dev->vblank_event_list);
|
|
queue_seq->sequence = req_seq;
|
|
}
|
|
|
|
spin_unlock_irqrestore(&dev->event_lock, spin_flags);
|
|
return 0;
|
|
|
|
err_unlock:
|
|
spin_unlock_irqrestore(&dev->event_lock, spin_flags);
|
|
drm_crtc_vblank_put(crtc);
|
|
err_free:
|
|
kfree(e);
|
|
return ret;
|
|
}
|