registration of the IRQs, and clear it to 0 after unregistering the
IRQs.
+IRQ Helper Library
+~~~~~~~~~~~~~~~~~~
+
+.. kernel-doc:: drivers/gpu/drm/drm_irq.c
+ :doc: irq helpers
+
+.. kernel-doc:: drivers/gpu/drm/drm_irq.c
+ :export:
+
Memory Manager Initialization
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Vertical Blanking and Interrupt Handling Functions Reference
------------------------------------------------------------
-.. kernel-doc:: include/drm/drm_irq.h
+.. kernel-doc:: include/drm/drm_vblank.h
:internal:
-.. kernel-doc:: drivers/gpu/drm/drm_irq.c
+.. kernel-doc:: drivers/gpu/drm/drm_vblank.c
:export:
drm_framebuffer.o drm_connector.o drm_blend.o \
drm_encoder.o drm_mode_object.o drm_property.o \
drm_plane.o drm_color_mgmt.o drm_print.o \
- drm_dumb_buffers.o drm_mode_config.o
+ drm_dumb_buffers.o drm_mode_config.o drm_vblank.o
drm-$(CONFIG_DRM_LIB_RANDOM) += lib/drm_random.o
drm-$(CONFIG_DRM_VM) += drm_vm.o
int drm_clients_info(struct seq_file *m, void* data);
int drm_gem_name_info(struct seq_file *m, void *data);
-/* drm_irq.c */
+/* drm_vblank.c */
extern unsigned int drm_timestamp_monotonic;
+void drm_vblank_disable_and_save(struct drm_device *dev, unsigned int pipe);
/* IOCTLS */
int drm_wait_vblank(struct drm_device *dev, void *data,
*
* \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.
*/
/*
* OTHER DEALINGS IN THE SOFTWARE.
*/
+#include <drm/drm_irq.h>
#include <drm/drmP.h>
-#include "drm_trace.h"
-#include "drm_internal.h"
#include <linux/interrupt.h> /* For task queue support */
-#include <linux/slab.h>
#include <linux/vgaarb.h>
#include <linux/export.h>
-/* 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_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 irq's.
- *
- * This is mostly useful for hardware that can obtain the scanout
- * position, but doesn't have a frame counter.
- */
-u32 drm_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_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.
- */
-static void 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);
- vblank_disable_and_save(dev, pipe);
- }
- spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
-}
-
-/**
- * drm_vblank_cleanup - cleanup vblank support
- * @dev: DRM device
- *
- * This function cleans up any resources allocated in drm_vblank_init.
- */
-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;
-}
-EXPORT_SYMBOL(drm_vblank_cleanup);
-
-/**
- * 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.
- *
- * 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);
+#include "drm_internal.h"
/**
* drm_irq_install - install IRQ handler
WARN_ON(drm_core_check_feature(dev, DRIVER_MODESET));
- vblank_disable_and_save(dev, i);
+ drm_vblank_disable_and_save(dev, i);
wake_up(&vblank->queue);
}
spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
return -EINVAL;
}
}
-
-/**
- * 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 called from
- * within get_vblank_timestamp() implementation of a kms driver to implement the
- * actual timestamping.
- *
- * Should return timestamps conforming to the OML_sync_control OpenML
- * extension specification. The timestamp corresponds to the end of
- * the vblank interval, aka start of scanout of topmost-leftmost display
- * pixel in the following video frame.
- *
- * Requires support for optional dev->driver->get_scanout_position()
- * in kms driver, plus a bit of setup code to provide a drm_display_mode
- * that corresponds to the true scanout timing.
- *
- * The current implementation only handles standard video modes. It
- * returns as no operation if a doublescan or interlaced video mode is
- * active. Higher level code is expected to handle this.
- *
- * This function can be used to implement the &drm_driver.get_vblank_timestamp
- * directly, if the driver implements the &drm_driver.get_scanout_position hook.
- *
- * 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.
- *
- * 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);
-
-/**
- * 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 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.
- *
- * This is the legacy version of drm_crtc_vblank_count_and_time().
- */
-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 again 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 event lock. Caller must also 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);
-}
-
-/**
- * drm_vblank_enable - enable the vblank interrupt on a CRTC
- * @dev: DRM device
- * @pipe: CRTC index
- *
- * Returns:
- * Zero on success or a negative error code on failure.
- */
-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;
-}
-
-/**
- * drm_vblank_get - get a reference count on vblank events
- * @dev: DRM device
- * @pipe: index of CRTC to own
- *
- * Acquire a reference count on vblank events to avoid having them disabled
- * while in use.
- *
- * This is the legacy version of drm_crtc_vblank_get().
- *
- * Returns:
- * Zero on success or a negative error code on failure.
- */
-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);
-
-/**
- * drm_vblank_put - release ownership of vblank events
- * @dev: DRM device
- * @pipe: index of CRTC to release
- *
- * Release ownership of a given vblank counter, turning off interrupts
- * if possible. Disable interrupts after drm_vblank_offdelay milliseconds.
- *
- * This is the legacy version of drm_crtc_vblank_put().
- */
-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.
- */
-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.
- */
-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)
- 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.
- */
-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. 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(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));
-}
-
-/*
- * Wait for VBLANK.
- *
- * \param inode device inode.
- * \param file_priv DRM file private.
- * \param cmd command.
- * \param data user argument, pointing to a drm_wait_vblank structure.
- * \return zero on success or a negative number on failure.
- *
- * This function enables the vblank interrupt on the pipe requested, then
- * sleeps waiting for the requested sequence number to occur, and drops
- * the vblank interrupt refcount afterwards. (vblank IRQ disable follows that
- * after a timeout with no further vblank waits scheduled).
- */
-int drm_wait_vblank(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);
--- /dev/null
+/*
+ * 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"
+
+/* 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_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 irq's.
+ *
+ * This is mostly useful for hardware that can obtain the scanout
+ * position, but doesn't have a frame counter.
+ */
+u32 drm_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_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);
+}
+
+/**
+ * drm_vblank_cleanup - cleanup vblank support
+ * @dev: DRM device
+ *
+ * This function cleans up any resources allocated in drm_vblank_init.
+ */
+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;
+}
+EXPORT_SYMBOL(drm_vblank_cleanup);
+
+/**
+ * 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.
+ *
+ * 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 called from
+ * within get_vblank_timestamp() implementation of a kms driver to implement the
+ * actual timestamping.
+ *
+ * Should return timestamps conforming to the OML_sync_control OpenML
+ * extension specification. The timestamp corresponds to the end of
+ * the vblank interval, aka start of scanout of topmost-leftmost display
+ * pixel in the following video frame.
+ *
+ * Requires support for optional dev->driver->get_scanout_position()
+ * in kms driver, plus a bit of setup code to provide a drm_display_mode
+ * that corresponds to the true scanout timing.
+ *
+ * The current implementation only handles standard video modes. It
+ * returns as no operation if a doublescan or interlaced video mode is
+ * active. Higher level code is expected to handle this.
+ *
+ * This function can be used to implement the &drm_driver.get_vblank_timestamp
+ * directly, if the driver implements the &drm_driver.get_scanout_position hook.
+ *
+ * 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.
+ *
+ * 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);
+
+/**
+ * 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 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.
+ *
+ * This is the legacy version of drm_crtc_vblank_count_and_time().
+ */
+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 again 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 event lock. Caller must also 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);
+}
+
+/**
+ * drm_vblank_enable - enable the vblank interrupt on a CRTC
+ * @dev: DRM device
+ * @pipe: CRTC index
+ *
+ * Returns:
+ * Zero on success or a negative error code on failure.
+ */
+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;
+}
+
+/**
+ * drm_vblank_get - get a reference count on vblank events
+ * @dev: DRM device
+ * @pipe: index of CRTC to own
+ *
+ * Acquire a reference count on vblank events to avoid having them disabled
+ * while in use.
+ *
+ * This is the legacy version of drm_crtc_vblank_get().
+ *
+ * Returns:
+ * Zero on success or a negative error code on failure.
+ */
+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);
+
+/**
+ * drm_vblank_put - release ownership of vblank events
+ * @dev: DRM device
+ * @pipe: index of CRTC to release
+ *
+ * Release ownership of a given vblank counter, turning off interrupts
+ * if possible. Disable interrupts after drm_vblank_offdelay milliseconds.
+ *
+ * This is the legacy version of drm_crtc_vblank_put().
+ */
+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.
+ */
+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.
+ */
+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.
+ */
+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. 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(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));
+}
+
+/*
+ * Wait for VBLANK.
+ *
+ * \param inode device inode.
+ * \param file_priv DRM file private.
+ * \param cmd command.
+ * \param data user argument, pointing to a drm_wait_vblank structure.
+ * \return zero on success or a negative number on failure.
+ *
+ * This function enables the vblank interrupt on the pipe requested, then
+ * sleeps waiting for the requested sequence number to occur, and drops
+ * the vblank interrupt refcount afterwards. (vblank IRQ disable follows that
+ * after a timeout with no further vblank waits scheduled).
+ */
+int drm_wait_vblank(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);
#include <drm/drm_debugfs.h>
#include <drm/drm_ioctl.h>
#include <drm/drm_sysfs.h>
+#include <drm/drm_vblank.h>
+#include <drm/drm_irq.h>
+
struct module;
return dev->mode_config.funcs->atomic_commit != NULL;
}
-#include <drm/drm_irq.h>
-
#define DRM_SWITCH_POWER_ON 0
#define DRM_SWITCH_POWER_OFF 1
#define DRM_SWITCH_POWER_CHANGING 2
struct dma_fence;
struct drm_file;
struct drm_device;
+struct device;
/*
* FIXME: Not sure we want to have drm_minor here in the end, but to avoid
#ifndef _DRM_IRQ_H_
#define _DRM_IRQ_H_
-#include <linux/seqlock.h>
-
-/**
- * struct drm_pending_vblank_event - pending vblank event tracking
- */
-struct drm_pending_vblank_event {
- /**
- * @base: Base structure for tracking pending DRM events.
- */
- struct drm_pending_event base;
- /**
- * @pipe: drm_crtc_index() of the &drm_crtc this event is for.
- */
- unsigned int pipe;
- /**
- * @event: Actual event which will be sent to userspace.
- */
- struct drm_event_vblank event;
-};
-
-/**
- * struct drm_vblank_crtc - vblank tracking for a CRTC
- *
- * This structure tracks the vblank state for one CRTC.
- *
- * Note that for historical reasons - the vblank handling code is still shared
- * with legacy/non-kms drivers - this is a free-standing structure not directly
- * connected to &struct drm_crtc. But all public interface functions are taking
- * a &struct drm_crtc to hide this implementation detail.
- */
-struct drm_vblank_crtc {
- /**
- * @dev: Pointer to the &drm_device.
- */
- struct drm_device *dev;
- /**
- * @queue: Wait queue for vblank waiters.
- */
- wait_queue_head_t queue; /**< VBLANK wait queue */
- /**
- * @disable_timer: Disable timer for the delayed vblank disabling
- * hysteresis logic. Vblank disabling is controlled through the
- * drm_vblank_offdelay module option and the setting of the
- * &drm_device.max_vblank_count value.
- */
- struct timer_list disable_timer;
-
- /**
- * @seqlock: Protect vblank count and time.
- */
- seqlock_t seqlock; /* protects vblank count and time */
-
- /**
- * @count: Current software vblank counter.
- */
- u32 count;
- /**
- * @time: Vblank timestamp corresponding to @count.
- */
- struct timeval time;
-
- /**
- * @refcount: Number of users/waiters of the vblank interrupt. Only when
- * this refcount reaches 0 can the hardware interrupt be disabled using
- * @disable_timer.
- */
- atomic_t refcount; /* number of users of vblank interruptsper crtc */
- /**
- * @last: Protected by &drm_device.vbl_lock, used for wraparound handling.
- */
- u32 last;
- /**
- * @inmodeset: Tracks whether the vblank is disabled due to a modeset.
- * For legacy driver bit 2 additionally tracks whether an additional
- * temporary vblank reference has been acquired to paper over the
- * hardware counter resetting/jumping. KMS drivers should instead just
- * call drm_crtc_vblank_off() and drm_crtc_vblank_on(), which explicitly
- * save and restore the vblank count.
- */
- unsigned int inmodeset; /* Display driver is setting mode */
- /**
- * @pipe: drm_crtc_index() of the &drm_crtc corresponding to this
- * structure.
- */
- unsigned int pipe;
- /**
- * @framedur_ns: Frame/Field duration in ns, used by
- * drm_calc_vbltimestamp_from_scanoutpos() and computed by
- * drm_calc_timestamping_constants().
- */
- int framedur_ns;
- /**
- * @linedur_ns: Line duration in ns, used by
- * drm_calc_vbltimestamp_from_scanoutpos() and computed by
- * drm_calc_timestamping_constants().
- */
- int linedur_ns;
-
- /**
- * @hwmode:
- *
- * Cache of the current hardware display mode. Only valid when @enabled
- * is set. This is used by helpers like
- * drm_calc_vbltimestamp_from_scanoutpos(). We can't just access the
- * hardware mode by e.g. looking at &drm_crtc_state.adjusted_mode,
- * because that one is really hard to get from interrupt context.
- */
- struct drm_display_mode hwmode;
-
- /**
- * @enabled: Tracks the enabling state of the corresponding &drm_crtc to
- * avoid double-disabling and hence corrupting saved state. Needed by
- * drivers not using atomic KMS, since those might go through their CRTC
- * disabling functions multiple times.
- */
- bool enabled;
-};
+struct drm_device;
int drm_irq_install(struct drm_device *dev, int irq);
int drm_irq_uninstall(struct drm_device *dev);
-int drm_vblank_init(struct drm_device *dev, unsigned int num_crtcs);
-u32 drm_crtc_vblank_count(struct drm_crtc *crtc);
-u32 drm_crtc_vblank_count_and_time(struct drm_crtc *crtc,
- struct timeval *vblanktime);
-void drm_crtc_send_vblank_event(struct drm_crtc *crtc,
- struct drm_pending_vblank_event *e);
-void drm_crtc_arm_vblank_event(struct drm_crtc *crtc,
- struct drm_pending_vblank_event *e);
-bool drm_handle_vblank(struct drm_device *dev, unsigned int pipe);
-bool drm_crtc_handle_vblank(struct drm_crtc *crtc);
-int drm_crtc_vblank_get(struct drm_crtc *crtc);
-void drm_crtc_vblank_put(struct drm_crtc *crtc);
-void drm_wait_one_vblank(struct drm_device *dev, unsigned int pipe);
-void drm_crtc_wait_one_vblank(struct drm_crtc *crtc);
-void drm_crtc_vblank_off(struct drm_crtc *crtc);
-void drm_crtc_vblank_reset(struct drm_crtc *crtc);
-void drm_crtc_vblank_on(struct drm_crtc *crtc);
-void drm_vblank_cleanup(struct drm_device *dev);
-u32 drm_accurate_vblank_count(struct drm_crtc *crtc);
-
-bool drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
- unsigned int pipe, int *max_error,
- struct timeval *vblank_time,
- bool in_vblank_irq);
-void drm_calc_timestamping_constants(struct drm_crtc *crtc,
- const struct drm_display_mode *mode);
-
-/**
- * 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.
- */
-static inline wait_queue_head_t *drm_crtc_vblank_waitqueue(struct drm_crtc *crtc)
-{
- return &crtc->dev->vblank[drm_crtc_index(crtc)].queue;
-}
-
#endif
struct drm_gem_object;
struct drm_file;
+struct device;
+
struct dma_buf *drm_gem_prime_export(struct drm_device *dev,
struct drm_gem_object *obj,
int flags);
--- /dev/null
+/*
+ * Copyright 2016 Intel Corp.
+ *
+ * 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.
+ */
+
+#ifndef _DRM_VBLANK_H_
+#define _DRM_VBLANK_H_
+
+#include <linux/seqlock.h>
+#include <linux/idr.h>
+#include <linux/poll.h>
+
+#include <drm/drm_file.h>
+#include <drm/drm_modes.h>
+#include <uapi/drm/drm.h>
+
+struct drm_device;
+struct drm_crtc;
+
+/**
+ * struct drm_pending_vblank_event - pending vblank event tracking
+ */
+struct drm_pending_vblank_event {
+ /**
+ * @base: Base structure for tracking pending DRM events.
+ */
+ struct drm_pending_event base;
+ /**
+ * @pipe: drm_crtc_index() of the &drm_crtc this event is for.
+ */
+ unsigned int pipe;
+ /**
+ * @event: Actual event which will be sent to userspace.
+ */
+ struct drm_event_vblank event;
+};
+
+/**
+ * struct drm_vblank_crtc - vblank tracking for a CRTC
+ *
+ * This structure tracks the vblank state for one CRTC.
+ *
+ * Note that for historical reasons - the vblank handling code is still shared
+ * with legacy/non-kms drivers - this is a free-standing structure not directly
+ * connected to &struct drm_crtc. But all public interface functions are taking
+ * a &struct drm_crtc to hide this implementation detail.
+ */
+struct drm_vblank_crtc {
+ /**
+ * @dev: Pointer to the &drm_device.
+ */
+ struct drm_device *dev;
+ /**
+ * @queue: Wait queue for vblank waiters.
+ */
+ wait_queue_head_t queue; /**< VBLANK wait queue */
+ /**
+ * @disable_timer: Disable timer for the delayed vblank disabling
+ * hysteresis logic. Vblank disabling is controlled through the
+ * drm_vblank_offdelay module option and the setting of the
+ * &drm_device.max_vblank_count value.
+ */
+ struct timer_list disable_timer;
+
+ /**
+ * @seqlock: Protect vblank count and time.
+ */
+ seqlock_t seqlock; /* protects vblank count and time */
+
+ /**
+ * @count: Current software vblank counter.
+ */
+ u32 count;
+ /**
+ * @time: Vblank timestamp corresponding to @count.
+ */
+ struct timeval time;
+
+ /**
+ * @refcount: Number of users/waiters of the vblank interrupt. Only when
+ * this refcount reaches 0 can the hardware interrupt be disabled using
+ * @disable_timer.
+ */
+ atomic_t refcount; /* number of users of vblank interruptsper crtc */
+ /**
+ * @last: Protected by &drm_device.vbl_lock, used for wraparound handling.
+ */
+ u32 last;
+ /**
+ * @inmodeset: Tracks whether the vblank is disabled due to a modeset.
+ * For legacy driver bit 2 additionally tracks whether an additional
+ * temporary vblank reference has been acquired to paper over the
+ * hardware counter resetting/jumping. KMS drivers should instead just
+ * call drm_crtc_vblank_off() and drm_crtc_vblank_on(), which explicitly
+ * save and restore the vblank count.
+ */
+ unsigned int inmodeset; /* Display driver is setting mode */
+ /**
+ * @pipe: drm_crtc_index() of the &drm_crtc corresponding to this
+ * structure.
+ */
+ unsigned int pipe;
+ /**
+ * @framedur_ns: Frame/Field duration in ns, used by
+ * drm_calc_vbltimestamp_from_scanoutpos() and computed by
+ * drm_calc_timestamping_constants().
+ */
+ int framedur_ns;
+ /**
+ * @linedur_ns: Line duration in ns, used by
+ * drm_calc_vbltimestamp_from_scanoutpos() and computed by
+ * drm_calc_timestamping_constants().
+ */
+ int linedur_ns;
+
+ /**
+ * @hwmode:
+ *
+ * Cache of the current hardware display mode. Only valid when @enabled
+ * is set. This is used by helpers like
+ * drm_calc_vbltimestamp_from_scanoutpos(). We can't just access the
+ * hardware mode by e.g. looking at &drm_crtc_state.adjusted_mode,
+ * because that one is really hard to get from interrupt context.
+ */
+ struct drm_display_mode hwmode;
+
+ /**
+ * @enabled: Tracks the enabling state of the corresponding &drm_crtc to
+ * avoid double-disabling and hence corrupting saved state. Needed by
+ * drivers not using atomic KMS, since those might go through their CRTC
+ * disabling functions multiple times.
+ */
+ bool enabled;
+};
+
+int drm_vblank_init(struct drm_device *dev, unsigned int num_crtcs);
+u32 drm_crtc_vblank_count(struct drm_crtc *crtc);
+u32 drm_crtc_vblank_count_and_time(struct drm_crtc *crtc,
+ struct timeval *vblanktime);
+void drm_crtc_send_vblank_event(struct drm_crtc *crtc,
+ struct drm_pending_vblank_event *e);
+void drm_crtc_arm_vblank_event(struct drm_crtc *crtc,
+ struct drm_pending_vblank_event *e);
+bool drm_handle_vblank(struct drm_device *dev, unsigned int pipe);
+bool drm_crtc_handle_vblank(struct drm_crtc *crtc);
+int drm_crtc_vblank_get(struct drm_crtc *crtc);
+void drm_crtc_vblank_put(struct drm_crtc *crtc);
+void drm_wait_one_vblank(struct drm_device *dev, unsigned int pipe);
+void drm_crtc_wait_one_vblank(struct drm_crtc *crtc);
+void drm_crtc_vblank_off(struct drm_crtc *crtc);
+void drm_crtc_vblank_reset(struct drm_crtc *crtc);
+void drm_crtc_vblank_on(struct drm_crtc *crtc);
+void drm_vblank_cleanup(struct drm_device *dev);
+u32 drm_accurate_vblank_count(struct drm_crtc *crtc);
+
+bool drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
+ unsigned int pipe, int *max_error,
+ struct timeval *vblank_time,
+ bool in_vblank_irq);
+void drm_calc_timestamping_constants(struct drm_crtc *crtc,
+ const struct drm_display_mode *mode);
+wait_queue_head_t *drm_crtc_vblank_waitqueue(struct drm_crtc *crtc);
+#endif
projects / openwrt / staging / blogic.git / commitdiff