linux/drivers/gpu/drm/drm_vblank.c

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/*
* drm_irq.c IRQ and vblank support
*
* \author Rickard E. (Rik) Faith <faith@valinux.com>
* \author Gareth Hughes <gareth@valinux.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
#include <drm/drm_vblank.h>
#include <drm/drmP.h>
#include <linux/export.h>
#include "drm_trace.h"
#include "drm_internal.h"
/**
* DOC: vblank handling
*
* Vertical blanking plays a major role in graphics rendering. To achieve
* tear-free display, users must synchronize page flips and/or rendering to
* vertical blanking. The DRM API offers ioctls to perform page flips
* synchronized to vertical blanking and wait for vertical blanking.
*
* The DRM core handles most of the vertical blanking management logic, which
* involves filtering out spurious interrupts, keeping race-free blanking
* counters, coping with counter wrap-around and resets and keeping use counts.
* It relies on the driver to generate vertical blanking interrupts and
* optionally provide a hardware vertical blanking counter.
*
* Drivers must initialize the vertical blanking handling core with a call to
* drm_vblank_init(). Minimally, a driver needs to implement
* &drm_crtc_funcs.enable_vblank and &drm_crtc_funcs.disable_vblank plus call
* drm_crtc_handle_vblank() in it's vblank interrupt handler for working vblank
* support.
*
* Vertical blanking interrupts can be enabled by the DRM core or by drivers
* themselves (for instance to handle page flipping operations). The DRM core
* maintains a vertical blanking use count to ensure that the interrupts are not
* disabled while a user still needs them. To increment the use count, drivers
* call drm_crtc_vblank_get() and release the vblank reference again with
* drm_crtc_vblank_put(). In between these two calls vblank interrupts are
* guaranteed to be enabled.
*
* On many hardware disabling the vblank interrupt cannot be done in a race-free
* manner, see &drm_driver.vblank_disable_immediate and
* &drm_driver.max_vblank_count. In that case the vblank core only disables the
* vblanks after a timer has expired, which can be configured through the
* ``vblankoffdelay`` module parameter.
*/
/* Retry timestamp calculation up to 3 times to satisfy
* drm_timestamp_precision before giving up.
*/
#define DRM_TIMESTAMP_MAXRETRIES 3
/* Threshold in nanoseconds for detection of redundant
* vblank irq in drm_handle_vblank(). 1 msec should be ok.
*/
#define DRM_REDUNDANT_VBLIRQ_THRESH_NS 1000000
static bool
drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe,
struct timeval *tvblank, bool in_vblank_irq);
static unsigned int drm_timestamp_precision = 20; /* Default to 20 usecs. */
/*
* Default to use monotonic timestamps for wait-for-vblank and page-flip
* complete events.
*/
unsigned int drm_timestamp_monotonic = 1;
static int drm_vblank_offdelay = 5000; /* Default to 5000 msecs. */
module_param_named(vblankoffdelay, drm_vblank_offdelay, int, 0600);
module_param_named(timestamp_precision_usec, drm_timestamp_precision, int, 0600);
module_param_named(timestamp_monotonic, drm_timestamp_monotonic, int, 0600);
MODULE_PARM_DESC(vblankoffdelay, "Delay until vblank irq auto-disable [msecs] (0: never disable, <0: disable immediately)");
MODULE_PARM_DESC(timestamp_precision_usec, "Max. error on timestamps [usecs]");
MODULE_PARM_DESC(timestamp_monotonic, "Use monotonic timestamps");
static void store_vblank(struct drm_device *dev, unsigned int pipe,
u32 vblank_count_inc,
struct timeval *t_vblank, u32 last)
{
struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
assert_spin_locked(&dev->vblank_time_lock);
vblank->last = last;
write_seqlock(&vblank->seqlock);
vblank->time = *t_vblank;
vblank->count += vblank_count_inc;
write_sequnlock(&vblank->seqlock);
}
/*
* "No hw counter" fallback implementation of .get_vblank_counter() hook,
* if there is no useable hardware frame counter available.
*/
static u32 drm_vblank_no_hw_counter(struct drm_device *dev, unsigned int pipe)
{
WARN_ON_ONCE(dev->max_vblank_count != 0);
return 0;
}
static u32 __get_vblank_counter(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 (crtc->funcs->get_vblank_counter)
return crtc->funcs->get_vblank_counter(crtc);
}
if (dev->driver->get_vblank_counter)
return dev->driver->get_vblank_counter(dev, pipe);
return drm_vblank_no_hw_counter(dev, pipe);
}
/*
* Reset the stored timestamp for the current vblank count to correspond
* to the last vblank occurred.
*
* Only to be called from drm_crtc_vblank_on().
*
* Note: caller must hold &drm_device.vbl_lock since this reads & writes
* device vblank fields.
*/
static void drm_reset_vblank_timestamp(struct drm_device *dev, unsigned int pipe)
{
u32 cur_vblank;
bool rc;
struct timeval t_vblank;
int count = DRM_TIMESTAMP_MAXRETRIES;
spin_lock(&dev->vblank_time_lock);
/*
* sample the current counter to avoid random jumps
* when drm_vblank_enable() applies the diff
*/
do {
cur_vblank = __get_vblank_counter(dev, pipe);
rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, false);
} while (cur_vblank != __get_vblank_counter(dev, pipe) && --count > 0);
/*
* Only reinitialize corresponding vblank timestamp if high-precision query
* available and didn't fail. Otherwise reinitialize delayed at next vblank
* interrupt and assign 0 for now, to mark the vblanktimestamp as invalid.
*/
if (!rc)
t_vblank = (struct timeval) {0, 0};
/*
* +1 to make sure user will never see the same
* vblank counter value before and after a modeset
*/
store_vblank(dev, pipe, 1, &t_vblank, cur_vblank);
spin_unlock(&dev->vblank_time_lock);
}
/*
* Call back into the driver to update the appropriate vblank counter
* (specified by @pipe). Deal with wraparound, if it occurred, and
* update the last read value so we can deal with wraparound on the next
* call if necessary.
*
* Only necessary when going from off->on, to account for frames we
* didn't get an interrupt for.
*
* Note: caller must hold &drm_device.vbl_lock since this reads & writes
* device vblank fields.
*/
static void drm_update_vblank_count(struct drm_device *dev, unsigned int pipe,
bool in_vblank_irq)
{
struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
u32 cur_vblank, diff;
bool rc;
struct timeval t_vblank;
int count = DRM_TIMESTAMP_MAXRETRIES;
int framedur_ns = vblank->framedur_ns;
/*
* Interrupts were disabled prior to this call, so deal with counter
* wrap if needed.
* NOTE! It's possible we lost a full dev->max_vblank_count + 1 events
* here if the register is small or we had vblank interrupts off for
* a long time.
*
* We repeat the hardware vblank counter & timestamp query until
* we get consistent results. This to prevent races between gpu
* updating its hardware counter while we are retrieving the
* corresponding vblank timestamp.
*/
do {
cur_vblank = __get_vblank_counter(dev, pipe);
rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, in_vblank_irq);
} while (cur_vblank != __get_vblank_counter(dev, pipe) && --count > 0);
if (dev->max_vblank_count != 0) {
/* trust the hw counter when it's around */
diff = (cur_vblank - vblank->last) & dev->max_vblank_count;
} else if (rc && framedur_ns) {
const struct timeval *t_old;
u64 diff_ns;
t_old = &vblank->time;
diff_ns = timeval_to_ns(&t_vblank) - timeval_to_ns(t_old);
/*
* Figure out how many vblanks we've missed based
* on the difference in the timestamps and the
* frame/field duration.
*/
diff = DIV_ROUND_CLOSEST_ULL(diff_ns, framedur_ns);
if (diff == 0 && in_vblank_irq)
DRM_DEBUG_VBL("crtc %u: Redundant vblirq ignored."
" diff_ns = %lld, framedur_ns = %d)\n",
pipe, (long long) diff_ns, framedur_ns);
} else {
/* some kind of default for drivers w/o accurate vbl timestamping */
diff = in_vblank_irq ? 1 : 0;
}
/*
* Within a drm_vblank_pre_modeset - drm_vblank_post_modeset
* interval? If so then vblank irqs keep running and it will likely
* happen that the hardware vblank counter is not trustworthy as it
* might reset at some point in that interval and vblank timestamps
* are not trustworthy either in that interval. Iow. this can result
* in a bogus diff >> 1 which must be avoided as it would cause
* random large forward jumps of the software vblank counter.
*/
if (diff > 1 && (vblank->inmodeset & 0x2)) {
DRM_DEBUG_VBL("clamping vblank bump to 1 on crtc %u: diffr=%u"
" due to pre-modeset.\n", pipe, diff);
diff = 1;
}
DRM_DEBUG_VBL("updating vblank count on crtc %u:"
" current=%u, diff=%u, hw=%u hw_last=%u\n",
pipe, vblank->count, diff, cur_vblank, vblank->last);
if (diff == 0) {
WARN_ON_ONCE(cur_vblank != vblank->last);
return;
}
/*
* Only reinitialize corresponding vblank timestamp if high-precision query
* available and didn't fail, or we were called from the vblank interrupt.
* Otherwise reinitialize delayed at next vblank interrupt and assign 0
* for now, to mark the vblanktimestamp as invalid.
*/
if (!rc && !in_vblank_irq)
t_vblank = (struct timeval) {0, 0};
store_vblank(dev, pipe, diff, &t_vblank, cur_vblank);
}
static u32 drm_vblank_count(struct drm_device *dev, unsigned int pipe)
{
struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
if (WARN_ON(pipe >= dev->num_crtcs))
return 0;
return vblank->count;
}
/**
* drm_crtc_accurate_vblank_count - retrieve the master vblank counter
* @crtc: which counter to retrieve
*
* This function is similar to drm_crtc_vblank_count() but this function
* interpolates to handle a race with vblank interrupts using the high precision
* timestamping support.
*
* This is mostly useful for hardware that can obtain the scanout position, but
* doesn't have a hardware frame counter.
*/
u32 drm_crtc_accurate_vblank_count(struct drm_crtc *crtc)
{
struct drm_device *dev = crtc->dev;
unsigned int pipe = drm_crtc_index(crtc);
u32 vblank;
unsigned long flags;
WARN(!dev->driver->get_vblank_timestamp,
"This function requires support for accurate vblank timestamps.");
spin_lock_irqsave(&dev->vblank_time_lock, flags);
drm_update_vblank_count(dev, pipe, false);
vblank = drm_vblank_count(dev, pipe);
spin_unlock_irqrestore(&dev->vblank_time_lock, flags);
return vblank;
}
EXPORT_SYMBOL(drm_crtc_accurate_vblank_count);
static void __disable_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 (crtc->funcs->disable_vblank) {
crtc->funcs->disable_vblank(crtc);
return;
}
}
dev->driver->disable_vblank(dev, pipe);
}
/*
* Disable vblank irq's on crtc, make sure that last vblank count
* of hardware and corresponding consistent software vblank counter
* are preserved, even if there are any spurious vblank irq's after
* disable.
*/
void drm_vblank_disable_and_save(struct drm_device *dev, unsigned int pipe)
{
struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
unsigned long irqflags;
assert_spin_locked(&dev->vbl_lock);
/* Prevent vblank irq processing while disabling vblank irqs,
* so no updates of timestamps or count can happen after we've
* disabled. Needed to prevent races in case of delayed irq's.
*/
spin_lock_irqsave(&dev->vblank_time_lock, irqflags);
/*
* Only disable vblank interrupts if they're enabled. This avoids
* calling the ->disable_vblank() operation in atomic context with the
* hardware potentially runtime suspended.
*/
if (vblank->enabled) {
__disable_vblank(dev, pipe);
vblank->enabled = false;
}
/*
* Always update the count and timestamp to maintain the
* appearance that the counter has been ticking all along until
* this time. This makes the count account for the entire time
* between drm_crtc_vblank_on() and drm_crtc_vblank_off().
*/
drm_update_vblank_count(dev, pipe, false);
spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags);
}
static void vblank_disable_fn(unsigned long arg)
{
struct drm_vblank_crtc *vblank = (void *)arg;
struct drm_device *dev = vblank->dev;
unsigned int pipe = vblank->pipe;
unsigned long irqflags;
spin_lock_irqsave(&dev->vbl_lock, irqflags);
if (atomic_read(&vblank->refcount) == 0 && vblank->enabled) {
DRM_DEBUG("disabling vblank on crtc %u\n", pipe);
drm_vblank_disable_and_save(dev, pipe);
}
spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
}
void drm_vblank_cleanup(struct drm_device *dev)
{
unsigned int pipe;
/* Bail if the driver didn't call drm_vblank_init() */
if (dev->num_crtcs == 0)
return;
for (pipe = 0; pipe < dev->num_crtcs; pipe++) {
struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
WARN_ON(READ_ONCE(vblank->enabled) &&
drm_core_check_feature(dev, DRIVER_MODESET));
del_timer_sync(&vblank->disable_timer);
}
kfree(dev->vblank);
dev->num_crtcs = 0;
}
/**
* drm_vblank_init - initialize vblank support
* @dev: DRM device
* @num_crtcs: number of CRTCs supported by @dev
*
* This function initializes vblank support for @num_crtcs display pipelines.
drm/vblank: Unexport drm_vblank_cleanup There's no reason for drivers to call this, and all the ones I've removed looked very fishy: - Proper quiescenting of the vblank machinery should be done by calling drm_crtc_vblank_off(), which is best done by shutting down the entire display engine with drm_atomic_helper_shutdown. - Releasing of allocated memory is done by the core already, it calls drm_vblank_cleanup as a fallback. - drm_vblank_cleanup also has checks for drivers which forget to clean up vblank interrupts. This essentially reverts commit e77cef9c2d87db835ad9d70cde4a9b00b0ca2262 Author: Jerome Glisse <jglisse@redhat.com> Date: Thu Jan 7 15:39:13 2010 +0100 drm: Avoid calling vblank function is vblank wasn't initialized which was done to fix a bug in radeon code with msi interrupts: commit 003e69f9862bcda89a75c27750efdbc17ac02945 Author: Jerome Glisse <jglisse@redhat.com> Date: Thu Jan 7 15:39:14 2010 +0100 drm/radeon/kms: Don't try to enable IRQ if we have no handler installed Afaict from digging around in old code, this was needed to avoid blowing up in the ums fallback, and has stopped serving it's purpose long ago - if irq init fails, the driver fails to load, and there's really no way to blow up anymore. Long story short, this was most likely a small ums compat/fallback hack that became a thing of it's own and got cargo-cult duplicated all over the drm codebase for essentially no gain at all. v2: Mention that for drivers with a ->release callback cleanup is handled by drm_dev_fini() (Thierry). Cc: Thierry Reding <treding@nvidia.com> Acked-by: Thierry Reding <treding@nvidia.com> Cc: Jerome Glisse <jglisse@redhat.com> Reviewed-by: Sean Paul <seanpaul@chromium.org> Acked-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170626161949.25629-2-daniel.vetter@ffwll.ch
2017-06-26 16:19:49 +00:00
* Cleanup is handled by the DRM core, or through calling drm_dev_fini() for
* drivers with a &drm_driver.release callback.
*
* Returns:
* Zero on success or a negative error code on failure.
*/
int drm_vblank_init(struct drm_device *dev, unsigned int num_crtcs)
{
int ret = -ENOMEM;
unsigned int i;
spin_lock_init(&dev->vbl_lock);
spin_lock_init(&dev->vblank_time_lock);
dev->num_crtcs = num_crtcs;
dev->vblank = kcalloc(num_crtcs, sizeof(*dev->vblank), GFP_KERNEL);
if (!dev->vblank)
goto err;
for (i = 0; i < num_crtcs; i++) {
struct drm_vblank_crtc *vblank = &dev->vblank[i];
vblank->dev = dev;
vblank->pipe = i;
init_waitqueue_head(&vblank->queue);
setup_timer(&vblank->disable_timer, vblank_disable_fn,
(unsigned long)vblank);
seqlock_init(&vblank->seqlock);
}
DRM_INFO("Supports vblank timestamp caching Rev 2 (21.10.2013).\n");
/* Driver specific high-precision vblank timestamping supported? */
if (dev->driver->get_vblank_timestamp)
DRM_INFO("Driver supports precise vblank timestamp query.\n");
else
DRM_INFO("No driver support for vblank timestamp query.\n");
/* Must have precise timestamping for reliable vblank instant disable */
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 struct timeval 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,
struct timeval *vblank_time,
bool in_vblank_irq)
{
struct timeval tv_etime;
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);
if (!drm_timestamp_monotonic)
etime = ktime_mono_to_real(etime);
/* save this only for debugging purposes */
tv_etime = ktime_to_timeval(etime);
/* Subtract time delta from raw timestamp to get final
* vblank_time timestamp for end of vblank.
*/
etime = ktime_sub_ns(etime, delta_ns);
*vblank_time = ktime_to_timeval(etime);
DRM_DEBUG_VBL("crtc %u : v p(%d,%d)@ %ld.%ld -> %ld.%ld [e %d us, %d rep]\n",
pipe, hpos, vpos,
(long)tv_etime.tv_sec, (long)tv_etime.tv_usec,
(long)vblank_time->tv_sec, (long)vblank_time->tv_usec,
duration_ns/1000, i);
return true;
}
EXPORT_SYMBOL(drm_calc_vbltimestamp_from_scanoutpos);
static struct timeval get_drm_timestamp(void)
{
ktime_t now;
now = drm_timestamp_monotonic ? ktime_get() : ktime_get_real();
return ktime_to_timeval(now);
}
/**
* 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 struct timeval 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,
struct timeval *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 = get_drm_timestamp();
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.
*/
u32 drm_crtc_vblank_count(struct drm_crtc *crtc)
{
return drm_vblank_count(crtc->dev, drm_crtc_index(crtc));
}
EXPORT_SYMBOL(drm_crtc_vblank_count);
static u32 drm_vblank_count_and_time(struct drm_device *dev, unsigned int pipe,
struct timeval *vblanktime)
{
struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
u32 vblank_count;
unsigned int seq;
if (WARN_ON(pipe >= dev->num_crtcs)) {
*vblanktime = (struct timeval) { 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 struct timeval 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.
*/
u32 drm_crtc_vblank_count_and_time(struct drm_crtc *crtc,
struct timeval *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,
unsigned long seq, struct timeval *now)
{
e->event.sequence = seq;
e->event.tv_sec = now->tv_sec;
e->event.tv_usec = now->tv_usec;
trace_drm_vblank_event_delivered(e->base.file_priv, e->pipe,
e->event.sequence);
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, 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->event.sequence = drm_vblank_count(dev, pipe);
e->event.crtc_id = crtc->base.id;
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;
unsigned int seq, pipe = drm_crtc_index(crtc);
struct timeval now;
if (dev->num_crtcs > 0) {
seq = drm_vblank_count_and_time(dev, pipe, &now);
} else {
seq = 0;
now = get_drm_timestamp();
}
e->pipe = pipe;
e->event.crtc_id = crtc->base.id;
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 (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((unsigned long)vblank);
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;
u32 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;
struct timeval now;
unsigned long irqflags;
unsigned int 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 %u, current %u\n",
e->event.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_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);
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(u32 seq, u32 ref)
{
return (seq - ref) <= (1 << 23);
}
static int drm_queue_vblank_event(struct drm_device *dev, unsigned int pipe,
union drm_wait_vblank *vblwait,
struct drm_file *file_priv)
{
struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
struct drm_pending_vblank_event *e;
struct timeval now;
unsigned long flags;
unsigned int 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);
e->event.user_data = vblwait->request.signal;
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 %u, current %u, crtc %u\n",
vblwait->request.sequence, seq, pipe);
trace_drm_vblank_event_queued(file_priv, pipe,
vblwait->request.sequence);
e->event.sequence = vblwait->request.sequence;
if (vblank_passed(seq, vblwait->request.sequence)) {
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 = vblwait->request.sequence;
}
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));
}
int drm_wait_vblank_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
struct drm_vblank_crtc *vblank;
union drm_wait_vblank *vblwait = data;
int ret;
unsigned int flags, seq, 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_ERROR("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 = high_pipe >> _DRM_VBLANK_HIGH_CRTC_SHIFT;
else
pipe = flags & _DRM_VBLANK_SECONDARY ? 1 : 0;
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)) {
struct timeval now;
vblwait->reply.sequence =
drm_vblank_count_and_time(dev, pipe, &now);
vblwait->reply.tval_sec = now.tv_sec;
vblwait->reply.tval_usec = now.tv_usec;
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:
vblwait->request.sequence += seq;
vblwait->request.type &= ~_DRM_VBLANK_RELATIVE;
case _DRM_VBLANK_ABSOLUTE:
break;
default:
ret = -EINVAL;
goto done;
}
if ((flags & _DRM_VBLANK_NEXTONMISS) &&
vblank_passed(seq, vblwait->request.sequence))
vblwait->request.sequence = seq + 1;
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, vblwait, file_priv);
}
if (vblwait->request.sequence != seq) {
DRM_DEBUG("waiting on vblank count %u, crtc %u\n",
vblwait->request.sequence, pipe);
DRM_WAIT_ON(ret, vblank->queue, 3 * HZ,
vblank_passed(drm_vblank_count(dev, pipe),
vblwait->request.sequence) ||
!READ_ONCE(vblank->enabled));
}
if (ret != -EINTR) {
struct timeval now;
vblwait->reply.sequence = drm_vblank_count_and_time(dev, pipe, &now);
vblwait->reply.tval_sec = now.tv_sec;
vblwait->reply.tval_usec = now.tv_usec;
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;
struct timeval now;
unsigned int 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->event.sequence))
continue;
DRM_DEBUG("vblank event on %u, current %u\n",
e->event.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((unsigned long)vblank);
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);