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sys/dev/drm/core/drm_vblank.c
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/* | |||||
* drm_irq.c IRQ and vblank support | |||||
* | |||||
* \author Rickard E. (Rik) Faith <faith@valinux.com> | |||||
* \author Gareth Hughes <gareth@valinux.com> | |||||
* | |||||
* Permission is hereby granted, free of charge, to any person obtaining a | |||||
* copy of this software and associated documentation files (the "Software"), | |||||
* to deal in the Software without restriction, including without limitation | |||||
* the rights to use, copy, modify, merge, publish, distribute, sublicense, | |||||
* and/or sell copies of the Software, and to permit persons to whom the | |||||
* Software is furnished to do so, subject to the following conditions: | |||||
* | |||||
* The above copyright notice and this permission notice (including the next | |||||
* paragraph) shall be included in all copies or substantial portions of the | |||||
* Software. | |||||
* | |||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |||||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |||||
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |||||
* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR | |||||
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, | |||||
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR | |||||
* OTHER DEALINGS IN THE SOFTWARE. | |||||
*/ | |||||
#include <linux/export.h> | |||||
#include <linux/moduleparam.h> | |||||
#include <drm/drm_crtc.h> | |||||
#include <drm/drm_drv.h> | |||||
#include <drm/drm_framebuffer.h> | |||||
#include <drm/drm_print.h> | |||||
#include <drm/drm_vblank.h> | |||||
#include "drm_internal.h" | |||||
#include "drm_trace.h" | |||||
/** | |||||
* DOC: vblank handling | |||||
* | |||||
* Vertical blanking plays a major role in graphics rendering. To achieve | |||||
* tear-free display, users must synchronize page flips and/or rendering to | |||||
* vertical blanking. The DRM API offers ioctls to perform page flips | |||||
* synchronized to vertical blanking and wait for vertical blanking. | |||||
* | |||||
* The DRM core handles most of the vertical blanking management logic, which | |||||
* involves filtering out spurious interrupts, keeping race-free blanking | |||||
* counters, coping with counter wrap-around and resets and keeping use counts. | |||||
* It relies on the driver to generate vertical blanking interrupts and | |||||
* optionally provide a hardware vertical blanking counter. | |||||
* | |||||
* Drivers must initialize the vertical blanking handling core with a call to | |||||
* drm_vblank_init(). Minimally, a driver needs to implement | |||||
* &drm_crtc_funcs.enable_vblank and &drm_crtc_funcs.disable_vblank plus call | |||||
* drm_crtc_handle_vblank() in its vblank interrupt handler for working vblank | |||||
* support. | |||||
* | |||||
* Vertical blanking interrupts can be enabled by the DRM core or by drivers | |||||
* themselves (for instance to handle page flipping operations). The DRM core | |||||
* maintains a vertical blanking use count to ensure that the interrupts are not | |||||
* disabled while a user still needs them. To increment the use count, drivers | |||||
* call drm_crtc_vblank_get() and release the vblank reference again with | |||||
* drm_crtc_vblank_put(). In between these two calls vblank interrupts are | |||||
* guaranteed to be enabled. | |||||
* | |||||
* On many hardware disabling the vblank interrupt cannot be done in a race-free | |||||
* manner, see &drm_driver.vblank_disable_immediate and | |||||
* &drm_driver.max_vblank_count. In that case the vblank core only disables the | |||||
* vblanks after a timer has expired, which can be configured through the | |||||
* ``vblankoffdelay`` module parameter. | |||||
*/ | |||||
/* Retry timestamp calculation up to 3 times to satisfy | |||||
* drm_timestamp_precision before giving up. | |||||
*/ | |||||
#define DRM_TIMESTAMP_MAXRETRIES 3 | |||||
/* Threshold in nanoseconds for detection of redundant | |||||
* vblank irq in drm_handle_vblank(). 1 msec should be ok. | |||||
*/ | |||||
#define DRM_REDUNDANT_VBLIRQ_THRESH_NS 1000000 | |||||
static bool | |||||
drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe, | |||||
ktime_t *tvblank, bool in_vblank_irq); | |||||
static unsigned int drm_timestamp_precision = 20; /* Default to 20 usecs. */ | |||||
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_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]"); | |||||
static void store_vblank(struct drm_device *dev, unsigned int pipe, | |||||
u32 vblank_count_inc, | |||||
ktime_t 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); | |||||
} | |||||
static u32 drm_max_vblank_count(struct drm_device *dev, unsigned int pipe) | |||||
{ | |||||
struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |||||
return vblank->max_vblank_count ?: dev->max_vblank_count; | |||||
} | |||||
/* | |||||
* "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(drm_max_vblank_count(dev, pipe) != 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 (WARN_ON(!crtc)) | |||||
return 0; | |||||
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; | |||||
ktime_t 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 = 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; | |||||
ktime_t t_vblank; | |||||
int count = DRM_TIMESTAMP_MAXRETRIES; | |||||
int framedur_ns = vblank->framedur_ns; | |||||
u32 max_vblank_count = drm_max_vblank_count(dev, pipe); | |||||
/* | |||||
* 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 (max_vblank_count) { | |||||
/* trust the hw counter when it's around */ | |||||
diff = (cur_vblank - vblank->last) & max_vblank_count; | |||||
} else if (rc && framedur_ns) { | |||||
u64 diff_ns = ktime_to_ns(ktime_sub(t_vblank, vblank->time)); | |||||
/* | |||||
* Figure out how many vblanks we've missed based | |||||
* on the difference in the timestamps and the | |||||
* frame/field duration. | |||||
*/ | |||||
DRM_DEBUG_VBL("crtc %u: Calculating number of vblanks." | |||||
" diff_ns = %lld, framedur_ns = %d)\n", | |||||
pipe, (long long) diff_ns, framedur_ns); | |||||
diff = DIV_ROUND_CLOSEST_ULL(diff_ns, framedur_ns); | |||||
if (diff == 0 && in_vblank_irq) | |||||
DRM_DEBUG_VBL("crtc %u: Redundant vblirq ignored\n", | |||||
pipe); | |||||
} 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=%llu, 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 = 0; | |||||
store_vblank(dev, pipe, diff, t_vblank, cur_vblank); | |||||
} | |||||
static u64 drm_vblank_count(struct drm_device *dev, unsigned int pipe) | |||||
{ | |||||
struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |||||
if (WARN_ON(pipe >= dev->num_crtcs)) | |||||
return 0; | |||||
return vblank->count; | |||||
} | |||||
/** | |||||
* drm_crtc_accurate_vblank_count - retrieve the master vblank counter | |||||
* @crtc: which counter to retrieve | |||||
* | |||||
* This function is similar to drm_crtc_vblank_count() but this function | |||||
* interpolates to handle a race with vblank interrupts using the high precision | |||||
* timestamping support. | |||||
* | |||||
* This is mostly useful for hardware that can obtain the scanout position, but | |||||
* doesn't have a hardware frame counter. | |||||
*/ | |||||
u64 drm_crtc_accurate_vblank_count(struct drm_crtc *crtc) | |||||
{ | |||||
struct drm_device *dev = crtc->dev; | |||||
unsigned int pipe = drm_crtc_index(crtc); | |||||
u64 vblank; | |||||
unsigned long flags; | |||||
WARN_ONCE(drm_debug & DRM_UT_VBL && !dev->driver->get_vblank_timestamp, | |||||
"This function requires support for accurate vblank timestamps."); | |||||
spin_lock_irqsave(&dev->vblank_time_lock, flags); | |||||
drm_update_vblank_count(dev, pipe, false); | |||||
vblank = drm_vblank_count(dev, pipe); | |||||
spin_unlock_irqrestore(&dev->vblank_time_lock, flags); | |||||
return vblank; | |||||
} | |||||
EXPORT_SYMBOL(drm_crtc_accurate_vblank_count); | |||||
static void __disable_vblank(struct drm_device *dev, unsigned int pipe) | |||||
{ | |||||
if (drm_core_check_feature(dev, DRIVER_MODESET)) { | |||||
struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe); | |||||
if (WARN_ON(!crtc)) | |||||
return; | |||||
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); | |||||
/* | |||||
* Update vblank count and disable vblank interrupts only if the | |||||
* interrupts were enabled. This avoids calling the ->disable_vblank() | |||||
* operation in atomic context with the hardware potentially runtime | |||||
* suspended. | |||||
*/ | |||||
if (!vblank->enabled) | |||||
goto out; | |||||
/* | |||||
* 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); | |||||
__disable_vblank(dev, pipe); | |||||
vblank->enabled = false; | |||||
out: | |||||
spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); | |||||
} | |||||
static void vblank_disable_fn(struct timer_list *t) | |||||
{ | |||||
struct drm_vblank_crtc *vblank = from_timer(vblank, t, disable_timer); | |||||
struct drm_device *dev = vblank->dev; | |||||
unsigned int pipe = vblank->pipe; | |||||
unsigned long irqflags; | |||||
spin_lock_irqsave(&dev->vbl_lock, irqflags); | |||||
if (atomic_read(&vblank->refcount) == 0 && vblank->enabled) { | |||||
DRM_DEBUG("disabling vblank on crtc %u\n", pipe); | |||||
drm_vblank_disable_and_save(dev, pipe); | |||||
} | |||||
spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |||||
} | |||||
void drm_vblank_cleanup(struct drm_device *dev) | |||||
{ | |||||
unsigned int pipe; | |||||
/* Bail if the driver didn't call drm_vblank_init() */ | |||||
if (dev->num_crtcs == 0) | |||||
return; | |||||
for (pipe = 0; pipe < dev->num_crtcs; pipe++) { | |||||
struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |||||
WARN_ON(READ_ONCE(vblank->enabled) && | |||||
drm_core_check_feature(dev, DRIVER_MODESET)); | |||||
del_timer_sync(&vblank->disable_timer); | |||||
} | |||||
kfree(dev->vblank); | |||||
dev->num_crtcs = 0; | |||||
} | |||||
/** | |||||
* drm_vblank_init - initialize vblank support | |||||
* @dev: DRM device | |||||
* @num_crtcs: number of CRTCs supported by @dev | |||||
* | |||||
* This function initializes vblank support for @num_crtcs display pipelines. | |||||
* Cleanup is handled by the DRM core, or through calling drm_dev_fini() for | |||||
* drivers with a &drm_driver.release callback. | |||||
* | |||||
* Returns: | |||||
* Zero on success or a negative error code on failure. | |||||
*/ | |||||
int drm_vblank_init(struct drm_device *dev, unsigned int num_crtcs) | |||||
{ | |||||
int ret = -ENOMEM; | |||||
unsigned int i; | |||||
spin_lock_init(&dev->vbl_lock); | |||||
spin_lock_init(&dev->vblank_time_lock); | |||||
dev->num_crtcs = num_crtcs; | |||||
dev->vblank = kcalloc(num_crtcs, sizeof(*dev->vblank), GFP_KERNEL); | |||||
if (!dev->vblank) | |||||
goto err; | |||||
for (i = 0; i < num_crtcs; i++) { | |||||
struct drm_vblank_crtc *vblank = &dev->vblank[i]; | |||||
vblank->dev = dev; | |||||
vblank->pipe = i; | |||||
init_waitqueue_head(&vblank->queue); | |||||
timer_setup(&vblank->disable_timer, vblank_disable_fn, 0); | |||||
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 time which should receive the timestamp | |||||
* @in_vblank_irq: | |||||
* True when called from drm_crtc_handle_vblank(). Some drivers | |||||
* need to apply some workarounds for gpu-specific vblank irq quirks | |||||
* if flag is set. | |||||
* | |||||
* Implements calculation of exact vblank timestamps from given drm_display_mode | |||||
* timings and current video scanout position of a CRTC. This can be directly | |||||
* used as the &drm_driver.get_vblank_timestamp implementation of a kms driver | |||||
* if &drm_driver.get_scanout_position is implemented. | |||||
* | |||||
* The current implementation only handles standard video modes. For double scan | |||||
* and interlaced modes the driver is supposed to adjust the hardware mode | |||||
* (taken from &drm_crtc_state.adjusted mode for atomic modeset drivers) to | |||||
* match the scanout position reported. | |||||
* | |||||
* Note that atomic drivers must call drm_calc_timestamping_constants() before | |||||
* enabling a CRTC. The atomic helpers already take care of that in | |||||
* drm_atomic_helper_update_legacy_modeset_state(). | |||||
* | |||||
* Returns: | |||||
* | |||||
* Returns true on success, and false on failure, i.e. when no accurate | |||||
* timestamp could be acquired. | |||||
*/ | |||||
bool drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, | |||||
unsigned int pipe, | |||||
int *max_error, | |||||
ktime_t *vblank_time, | |||||
bool in_vblank_irq) | |||||
{ | |||||
struct timespec64 ts_etime, ts_vblank_time; | |||||
ktime_t stime, etime; | |||||
bool vbl_status; | |||||
struct drm_crtc *crtc; | |||||
const struct drm_display_mode *mode; | |||||
struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |||||
int vpos, hpos, i; | |||||
int delta_ns, duration_ns; | |||||
if (!drm_core_check_feature(dev, DRIVER_MODESET)) | |||||
return false; | |||||
crtc = drm_crtc_from_index(dev, pipe); | |||||
if (pipe >= dev->num_crtcs || !crtc) { | |||||
DRM_ERROR("Invalid crtc %u\n", pipe); | |||||
return false; | |||||
} | |||||
/* Scanout position query not supported? Should not happen. */ | |||||
if (!dev->driver->get_scanout_position) { | |||||
DRM_ERROR("Called from driver w/o get_scanout_position()!?\n"); | |||||
return false; | |||||
} | |||||
if (drm_drv_uses_atomic_modeset(dev)) | |||||
mode = &vblank->hwmode; | |||||
else | |||||
mode = &crtc->hwmode; | |||||
/* If mode timing undefined, just return as no-op: | |||||
* Happens during initial modesetting of a crtc. | |||||
*/ | |||||
if (mode->crtc_clock == 0) { | |||||
DRM_DEBUG("crtc %u: Noop due to uninitialized mode.\n", pipe); | |||||
WARN_ON_ONCE(drm_drv_uses_atomic_modeset(dev)); | |||||
return false; | |||||
} | |||||
/* Get current scanout position with system timestamp. | |||||
* Repeat query up to DRM_TIMESTAMP_MAXRETRIES times | |||||
* if single query takes longer than max_error nanoseconds. | |||||
* | |||||
* This guarantees a tight bound on maximum error if | |||||
* code gets preempted or delayed for some reason. | |||||
*/ | |||||
for (i = 0; i < DRM_TIMESTAMP_MAXRETRIES; i++) { | |||||
/* | |||||
* Get vertical and horizontal scanout position vpos, hpos, | |||||
* and bounding timestamps stime, etime, pre/post query. | |||||
*/ | |||||
vbl_status = dev->driver->get_scanout_position(dev, pipe, | |||||
in_vblank_irq, | |||||
&vpos, &hpos, | |||||
&stime, &etime, | |||||
mode); | |||||
/* Return as no-op if scanout query unsupported or failed. */ | |||||
if (!vbl_status) { | |||||
DRM_DEBUG("crtc %u : scanoutpos query failed.\n", | |||||
pipe); | |||||
return false; | |||||
} | |||||
/* Compute uncertainty in timestamp of scanout position query. */ | |||||
duration_ns = ktime_to_ns(etime) - ktime_to_ns(stime); | |||||
/* Accept result with < max_error nsecs timing uncertainty. */ | |||||
if (duration_ns <= *max_error) | |||||
break; | |||||
} | |||||
/* Noisy system timing? */ | |||||
if (i == DRM_TIMESTAMP_MAXRETRIES) { | |||||
DRM_DEBUG("crtc %u: Noisy timestamp %d us > %d us [%d reps].\n", | |||||
pipe, duration_ns/1000, *max_error/1000, i); | |||||
} | |||||
/* Return upper bound of timestamp precision error. */ | |||||
*max_error = duration_ns; | |||||
/* Convert scanout position into elapsed time at raw_time query | |||||
* since start of scanout at first display scanline. delta_ns | |||||
* can be negative if start of scanout hasn't happened yet. | |||||
*/ | |||||
delta_ns = div_s64(1000000LL * (vpos * mode->crtc_htotal + hpos), | |||||
mode->crtc_clock); | |||||
/* Subtract time delta from raw timestamp to get final | |||||
* vblank_time timestamp for end of vblank. | |||||
*/ | |||||
*vblank_time = ktime_sub_ns(etime, delta_ns); | |||||
if ((drm_debug & DRM_UT_VBL) == 0) | |||||
return true; | |||||
ts_etime = ktime_to_timespec64(etime); | |||||
ts_vblank_time = ktime_to_timespec64(*vblank_time); | |||||
DRM_DEBUG_VBL("crtc %u : v p(%d,%d)@ %lld.%06ld -> %lld.%06ld [e %d us, %d rep]\n", | |||||
pipe, hpos, vpos, | |||||
(u64)ts_etime.tv_sec, ts_etime.tv_nsec / 1000, | |||||
(u64)ts_vblank_time.tv_sec, ts_vblank_time.tv_nsec / 1000, | |||||
duration_ns / 1000, i); | |||||
return true; | |||||
} | |||||
EXPORT_SYMBOL(drm_calc_vbltimestamp_from_scanoutpos); | |||||
/** | |||||
* drm_get_last_vbltimestamp - retrieve raw timestamp for the most recent | |||||
* vblank interval | |||||
* @dev: DRM device | |||||
* @pipe: index of CRTC whose vblank timestamp to retrieve | |||||
* @tvblank: Pointer to target time which should receive the timestamp | |||||
* @in_vblank_irq: | |||||
* True when called from drm_crtc_handle_vblank(). Some drivers | |||||
* need to apply some workarounds for gpu-specific vblank irq quirks | |||||
* if flag is set. | |||||
* | |||||
* Fetches the system timestamp corresponding to the time of the most recent | |||||
* vblank interval on specified CRTC. May call into kms-driver to | |||||
* compute the timestamp with a high-precision GPU specific method. | |||||
* | |||||
* Returns zero if timestamp originates from uncorrected do_gettimeofday() | |||||
* call, i.e., it isn't very precisely locked to the true vblank. | |||||
* | |||||
* Returns: | |||||
* True if timestamp is considered to be very precise, false otherwise. | |||||
*/ | |||||
static bool | |||||
drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe, | |||||
ktime_t *tvblank, bool in_vblank_irq) | |||||
{ | |||||
bool ret = false; | |||||
/* Define requested maximum error on timestamps (nanoseconds). */ | |||||
int max_error = (int) drm_timestamp_precision * 1000; | |||||
/* Query driver if possible and precision timestamping enabled. */ | |||||
if (dev->driver->get_vblank_timestamp && (max_error > 0)) | |||||
ret = dev->driver->get_vblank_timestamp(dev, pipe, &max_error, | |||||
tvblank, in_vblank_irq); | |||||
/* GPU high precision timestamp query unsupported or failed. | |||||
* Return current monotonic/gettimeofday timestamp as best estimate. | |||||
*/ | |||||
if (!ret) | |||||
*tvblank = ktime_get(); | |||||
return ret; | |||||
} | |||||
/** | |||||
* drm_crtc_vblank_count - retrieve "cooked" vblank counter value | |||||
* @crtc: which counter to retrieve | |||||
* | |||||
* Fetches the "cooked" vblank count value that represents the number of | |||||
* vblank events since the system was booted, including lost events due to | |||||
* modesetting activity. Note that this timer isn't correct against a racing | |||||
* vblank interrupt (since it only reports the software vblank counter), see | |||||
* drm_crtc_accurate_vblank_count() for such use-cases. | |||||
* | |||||
* Returns: | |||||
* The software vblank counter. | |||||
*/ | |||||
u64 drm_crtc_vblank_count(struct drm_crtc *crtc) | |||||
{ | |||||
return drm_vblank_count(crtc->dev, drm_crtc_index(crtc)); | |||||
} | |||||
EXPORT_SYMBOL(drm_crtc_vblank_count); | |||||
/** | |||||
* drm_vblank_count_and_time - retrieve "cooked" vblank counter value and the | |||||
* system timestamp corresponding to that vblank counter value. | |||||
* @dev: DRM device | |||||
* @pipe: index of CRTC whose counter to retrieve | |||||
* @vblanktime: Pointer to ktime_t to receive the vblank timestamp. | |||||
* | |||||
* Fetches the "cooked" vblank count value that represents the number of | |||||
* vblank events since the system was booted, including lost events due to | |||||
* modesetting activity. Returns corresponding system timestamp of the time | |||||
* of the vblank interval that corresponds to the current vblank counter value. | |||||
* | |||||
* This is the legacy version of drm_crtc_vblank_count_and_time(). | |||||
*/ | |||||
static u64 drm_vblank_count_and_time(struct drm_device *dev, unsigned int pipe, | |||||
ktime_t *vblanktime) | |||||
{ | |||||
struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |||||
u64 vblank_count; | |||||
unsigned int seq; | |||||
if (WARN_ON(pipe >= dev->num_crtcs)) { | |||||
*vblanktime = 0; | |||||
return 0; | |||||
} | |||||
do { | |||||
seq = read_seqbegin(&vblank->seqlock); | |||||
vblank_count = vblank->count; | |||||
*vblanktime = vblank->time; | |||||
} while (read_seqretry(&vblank->seqlock, seq)); | |||||
return vblank_count; | |||||
} | |||||
/** | |||||
* drm_crtc_vblank_count_and_time - retrieve "cooked" vblank counter value | |||||
* and the system timestamp corresponding to that vblank counter value | |||||
* @crtc: which counter to retrieve | |||||
* @vblanktime: Pointer to time to receive the vblank timestamp. | |||||
* | |||||
* Fetches the "cooked" vblank count value that represents the number of | |||||
* vblank events since the system was booted, including lost events due to | |||||
* modesetting activity. Returns corresponding system timestamp of the time | |||||
* of the vblank interval that corresponds to the current vblank counter value. | |||||
*/ | |||||
u64 drm_crtc_vblank_count_and_time(struct drm_crtc *crtc, | |||||
ktime_t *vblanktime) | |||||
{ | |||||
return drm_vblank_count_and_time(crtc->dev, drm_crtc_index(crtc), | |||||
vblanktime); | |||||
} | |||||
EXPORT_SYMBOL(drm_crtc_vblank_count_and_time); | |||||
static void send_vblank_event(struct drm_device *dev, | |||||
struct drm_pending_vblank_event *e, | |||||
u64 seq, ktime_t now) | |||||
{ | |||||
struct timespec64 tv; | |||||
switch (e->event.base.type) { | |||||
case DRM_EVENT_VBLANK: | |||||
case DRM_EVENT_FLIP_COMPLETE: | |||||
tv = ktime_to_timespec64(now); | |||||
e->event.vbl.sequence = seq; | |||||
/* | |||||
* e->event is a user space structure, with hardcoded unsigned | |||||
* 32-bit seconds/microseconds. This is safe as we always use | |||||
* monotonic timestamps since linux-4.15 | |||||
*/ | |||||
e->event.vbl.tv_sec = tv.tv_sec; | |||||
e->event.vbl.tv_usec = tv.tv_nsec / 1000; | |||||
break; | |||||
case DRM_EVENT_CRTC_SEQUENCE: | |||||
if (seq) | |||||
e->event.seq.sequence = seq; | |||||
e->event.seq.time_ns = ktime_to_ns(now); | |||||
break; | |||||
} | |||||
trace_drm_vblank_event_delivered(e->base.file_priv, e->pipe, seq); | |||||
drm_send_event_locked(dev, &e->base); | |||||
} | |||||
/** | |||||
* drm_crtc_arm_vblank_event - arm vblank event after pageflip | |||||
* @crtc: the source CRTC of the vblank event | |||||
* @e: the event to send | |||||
* | |||||
* A lot of drivers need to generate vblank events for the very next vblank | |||||
* interrupt. For example when the page flip interrupt happens when the page | |||||
* flip gets armed, but not when it actually executes within the next vblank | |||||
* period. This helper function implements exactly the required vblank arming | |||||
* behaviour. | |||||
* | |||||
* NOTE: Drivers using this to send out the &drm_crtc_state.event as part of an | |||||
* atomic commit must ensure that the next vblank happens at exactly the same | |||||
* time as the atomic commit is committed to the hardware. This function itself | |||||
* does **not** protect against the next vblank interrupt racing with either this | |||||
* function call or the atomic commit operation. A possible sequence could be: | |||||
* | |||||
* 1. Driver commits new hardware state into vblank-synchronized registers. | |||||
* 2. A vblank happens, committing the hardware state. Also the corresponding | |||||
* vblank interrupt is fired off and fully processed by the interrupt | |||||
* handler. | |||||
* 3. The atomic commit operation proceeds to call drm_crtc_arm_vblank_event(). | |||||
* 4. The event is only send out for the next vblank, which is wrong. | |||||
* | |||||
* An equivalent race can happen when the driver calls | |||||
* drm_crtc_arm_vblank_event() before writing out the new hardware state. | |||||
* | |||||
* The only way to make this work safely is to prevent the vblank from firing | |||||
* (and the hardware from committing anything else) until the entire atomic | |||||
* commit sequence has run to completion. If the hardware does not have such a | |||||
* feature (e.g. using a "go" bit), then it is unsafe to use this functions. | |||||
* Instead drivers need to manually send out the event from their interrupt | |||||
* handler by calling drm_crtc_send_vblank_event() and make sure that there's no | |||||
* possible race with the hardware committing the atomic update. | |||||
* | |||||
* Caller must hold a vblank reference for the event @e acquired by a | |||||
* drm_crtc_vblank_get(), which will be dropped when the next vblank arrives. | |||||
*/ | |||||
void drm_crtc_arm_vblank_event(struct drm_crtc *crtc, | |||||
struct drm_pending_vblank_event *e) | |||||
{ | |||||
struct drm_device *dev = crtc->dev; | |||||
unsigned int pipe = drm_crtc_index(crtc); | |||||
assert_spin_locked(&dev->event_lock); | |||||
e->pipe = pipe; | |||||
e->sequence = drm_crtc_accurate_vblank_count(crtc) + 1; | |||||
list_add_tail(&e->base.link, &dev->vblank_event_list); | |||||
} | |||||
EXPORT_SYMBOL(drm_crtc_arm_vblank_event); | |||||
/** | |||||
* drm_crtc_send_vblank_event - helper to send vblank event after pageflip | |||||
* @crtc: the source CRTC of the vblank event | |||||
* @e: the event to send | |||||
* | |||||
* Updates sequence # and timestamp on event for the most recently processed | |||||
* vblank, and sends it to userspace. Caller must hold event lock. | |||||
* | |||||
* See drm_crtc_arm_vblank_event() for a helper which can be used in certain | |||||
* situation, especially to send out events for atomic commit operations. | |||||
*/ | |||||
void drm_crtc_send_vblank_event(struct drm_crtc *crtc, | |||||
struct drm_pending_vblank_event *e) | |||||
{ | |||||
struct drm_device *dev = crtc->dev; | |||||
u64 seq; | |||||
unsigned int pipe = drm_crtc_index(crtc); | |||||
ktime_t now; | |||||
if (dev->num_crtcs > 0) { | |||||
seq = drm_vblank_count_and_time(dev, pipe, &now); | |||||
} else { | |||||
seq = 0; | |||||
now = ktime_get(); | |||||
} | |||||
e->pipe = pipe; | |||||
send_vblank_event(dev, e, seq, now); | |||||
} | |||||
EXPORT_SYMBOL(drm_crtc_send_vblank_event); | |||||
static int __enable_vblank(struct drm_device *dev, unsigned int pipe) | |||||
{ | |||||
if (drm_core_check_feature(dev, DRIVER_MODESET)) { | |||||
struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe); | |||||
if (WARN_ON(!crtc)) | |||||
return 0; | |||||
if (crtc->funcs->enable_vblank) | |||||
return crtc->funcs->enable_vblank(crtc); | |||||
} | |||||
return dev->driver->enable_vblank(dev, pipe); | |||||
} | |||||
static int drm_vblank_enable(struct drm_device *dev, unsigned int pipe) | |||||
{ | |||||
struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |||||
int ret = 0; | |||||
assert_spin_locked(&dev->vbl_lock); | |||||
spin_lock(&dev->vblank_time_lock); | |||||
if (!vblank->enabled) { | |||||
/* | |||||
* Enable vblank irqs under vblank_time_lock protection. | |||||
* All vblank count & timestamp updates are held off | |||||
* until we are done reinitializing master counter and | |||||
* timestamps. Filtercode in drm_handle_vblank() will | |||||
* prevent double-accounting of same vblank interval. | |||||
*/ | |||||
ret = __enable_vblank(dev, pipe); | |||||
DRM_DEBUG("enabling vblank on crtc %u, ret: %d\n", pipe, ret); | |||||
if (ret) { | |||||
atomic_dec(&vblank->refcount); | |||||
} else { | |||||
drm_update_vblank_count(dev, pipe, 0); | |||||
/* drm_update_vblank_count() includes a wmb so we just | |||||
* need to ensure that the compiler emits the write | |||||
* to mark the vblank as enabled after the call | |||||
* to drm_update_vblank_count(). | |||||
*/ | |||||
WRITE_ONCE(vblank->enabled, true); | |||||
} | |||||
} | |||||
spin_unlock(&dev->vblank_time_lock); | |||||
return ret; | |||||
} | |||||
static int drm_vblank_get(struct drm_device *dev, unsigned int pipe) | |||||
{ | |||||
struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |||||
unsigned long irqflags; | |||||
int ret = 0; | |||||
if (!dev->num_crtcs) | |||||
return -EINVAL; | |||||
if (WARN_ON(pipe >= dev->num_crtcs)) | |||||
return -EINVAL; | |||||
spin_lock_irqsave(&dev->vbl_lock, irqflags); | |||||
/* Going from 0->1 means we have to enable interrupts again */ | |||||
if (atomic_add_return(1, &vblank->refcount) == 1) { | |||||
ret = drm_vblank_enable(dev, pipe); | |||||
} else { | |||||
if (!vblank->enabled) { | |||||
atomic_dec(&vblank->refcount); | |||||
ret = -EINVAL; | |||||
} | |||||
} | |||||
spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |||||
return ret; | |||||
} | |||||
/** | |||||
* drm_crtc_vblank_get - get a reference count on vblank events | |||||
* @crtc: which CRTC to own | |||||
* | |||||
* Acquire a reference count on vblank events to avoid having them disabled | |||||
* while in use. | |||||
* | |||||
* Returns: | |||||
* Zero on success or a negative error code on failure. | |||||
*/ | |||||
int drm_crtc_vblank_get(struct drm_crtc *crtc) | |||||
{ | |||||
return drm_vblank_get(crtc->dev, drm_crtc_index(crtc)); | |||||
} | |||||
EXPORT_SYMBOL(drm_crtc_vblank_get); | |||||
static void drm_vblank_put(struct drm_device *dev, unsigned int pipe) | |||||
{ | |||||
struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |||||
if (WARN_ON(pipe >= dev->num_crtcs)) | |||||
return; | |||||
if (WARN_ON(atomic_read(&vblank->refcount) == 0)) | |||||
return; | |||||
/* Last user schedules interrupt disable */ | |||||
if (atomic_dec_and_test(&vblank->refcount)) { | |||||
if (drm_vblank_offdelay == 0) | |||||
return; | |||||
else if (drm_vblank_offdelay < 0) | |||||
vblank_disable_fn(&vblank->disable_timer); | |||||
else if (!dev->vblank_disable_immediate) | |||||
mod_timer(&vblank->disable_timer, | |||||
jiffies + ((drm_vblank_offdelay * HZ)/1000)); | |||||
} | |||||
} | |||||
/** | |||||
* drm_crtc_vblank_put - give up ownership of vblank events | |||||
* @crtc: which counter to give up | |||||
* | |||||
* Release ownership of a given vblank counter, turning off interrupts | |||||
* if possible. Disable interrupts after drm_vblank_offdelay milliseconds. | |||||
*/ | |||||
void drm_crtc_vblank_put(struct drm_crtc *crtc) | |||||
{ | |||||
drm_vblank_put(crtc->dev, drm_crtc_index(crtc)); | |||||
} | |||||
EXPORT_SYMBOL(drm_crtc_vblank_put); | |||||
/** | |||||
* drm_wait_one_vblank - wait for one vblank | |||||
* @dev: DRM device | |||||
* @pipe: CRTC index | |||||
* | |||||
* This waits for one vblank to pass on @pipe, using the irq driver interfaces. | |||||
* It is a failure to call this when the vblank irq for @pipe is disabled, e.g. | |||||
* due to lack of driver support or because the crtc is off. | |||||
* | |||||
* This is the legacy version of drm_crtc_wait_one_vblank(). | |||||
*/ | |||||
void drm_wait_one_vblank(struct drm_device *dev, unsigned int pipe) | |||||
{ | |||||
struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |||||
int ret; | |||||
u64 last; | |||||
if (WARN_ON(pipe >= dev->num_crtcs)) | |||||
return; | |||||
ret = drm_vblank_get(dev, pipe); | |||||
if (WARN(ret, "vblank not available on crtc %i, ret=%i\n", pipe, ret)) | |||||
return; | |||||
last = drm_vblank_count(dev, pipe); | |||||
ret = wait_event_timeout(vblank->queue, | |||||
last != drm_vblank_count(dev, pipe), | |||||
msecs_to_jiffies(100)); | |||||
WARN(ret == 0, "vblank wait timed out on crtc %i\n", pipe); | |||||
drm_vblank_put(dev, pipe); | |||||
} | |||||
EXPORT_SYMBOL(drm_wait_one_vblank); | |||||
/** | |||||
* drm_crtc_wait_one_vblank - wait for one vblank | |||||
* @crtc: DRM crtc | |||||
* | |||||
* This waits for one vblank to pass on @crtc, using the irq driver interfaces. | |||||
* It is a failure to call this when the vblank irq for @crtc is disabled, e.g. | |||||
* due to lack of driver support or because the crtc is off. | |||||
*/ | |||||
void drm_crtc_wait_one_vblank(struct drm_crtc *crtc) | |||||
{ | |||||
drm_wait_one_vblank(crtc->dev, drm_crtc_index(crtc)); | |||||
} | |||||
EXPORT_SYMBOL(drm_crtc_wait_one_vblank); | |||||
/** | |||||
* drm_crtc_vblank_off - disable vblank events on a CRTC | |||||
* @crtc: CRTC in question | |||||
* | |||||
* Drivers can use this function to shut down the vblank interrupt handling when | |||||
* disabling a crtc. This function ensures that the latest vblank frame count is | |||||
* stored so that drm_vblank_on can restore it again. | |||||
* | |||||
* Drivers must use this function when the hardware vblank counter can get | |||||
* reset, e.g. when suspending or disabling the @crtc in general. | |||||
*/ | |||||
void drm_crtc_vblank_off(struct drm_crtc *crtc) | |||||
{ | |||||
struct drm_device *dev = crtc->dev; | |||||
unsigned int pipe = drm_crtc_index(crtc); | |||||
struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |||||
struct drm_pending_vblank_event *e, *t; | |||||
ktime_t now; | |||||
unsigned long irqflags; | |||||
u64 seq; | |||||
if (WARN_ON(pipe >= dev->num_crtcs)) | |||||
return; | |||||
spin_lock_irqsave(&dev->event_lock, irqflags); | |||||
spin_lock(&dev->vbl_lock); | |||||
DRM_DEBUG_VBL("crtc %d, vblank enabled %d, inmodeset %d\n", | |||||
pipe, vblank->enabled, vblank->inmodeset); | |||||
/* Avoid redundant vblank disables without previous | |||||
* drm_crtc_vblank_on(). */ | |||||
if (drm_core_check_feature(dev, DRIVER_ATOMIC) || !vblank->inmodeset) | |||||
drm_vblank_disable_and_save(dev, pipe); | |||||
wake_up(&vblank->queue); | |||||
/* | |||||
* Prevent subsequent drm_vblank_get() from re-enabling | |||||
* the vblank interrupt by bumping the refcount. | |||||
*/ | |||||
if (!vblank->inmodeset) { | |||||
atomic_inc(&vblank->refcount); | |||||
vblank->inmodeset = 1; | |||||
} | |||||
spin_unlock(&dev->vbl_lock); | |||||
/* Send any queued vblank events, lest the natives grow disquiet */ | |||||
seq = drm_vblank_count_and_time(dev, pipe, &now); | |||||
list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { | |||||
if (e->pipe != pipe) | |||||
continue; | |||||
DRM_DEBUG("Sending premature vblank event on disable: " | |||||
"wanted %llu, current %llu\n", | |||||
e->sequence, seq); | |||||
list_del(&e->base.link); | |||||
drm_vblank_put(dev, pipe); | |||||
send_vblank_event(dev, e, seq, now); | |||||
} | |||||
spin_unlock_irqrestore(&dev->event_lock, irqflags); | |||||
/* Will be reset by the modeset helpers when re-enabling the crtc by | |||||
* calling drm_calc_timestamping_constants(). */ | |||||
vblank->hwmode.crtc_clock = 0; | |||||
} | |||||
EXPORT_SYMBOL(drm_crtc_vblank_off); | |||||
/** | |||||
* drm_crtc_vblank_reset - reset vblank state to off on a CRTC | |||||
* @crtc: CRTC in question | |||||
* | |||||
* Drivers can use this function to reset the vblank state to off at load time. | |||||
* Drivers should use this together with the drm_crtc_vblank_off() and | |||||
* drm_crtc_vblank_on() functions. The difference compared to | |||||
* drm_crtc_vblank_off() is that this function doesn't save the vblank counter | |||||
* and hence doesn't need to call any driver hooks. | |||||
* | |||||
* This is useful for recovering driver state e.g. on driver load, or on resume. | |||||
*/ | |||||
void drm_crtc_vblank_reset(struct drm_crtc *crtc) | |||||
{ | |||||
struct drm_device *dev = crtc->dev; | |||||
unsigned long irqflags; | |||||
unsigned int pipe = drm_crtc_index(crtc); | |||||
struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |||||
spin_lock_irqsave(&dev->vbl_lock, irqflags); | |||||
/* | |||||
* Prevent subsequent drm_vblank_get() from enabling the vblank | |||||
* interrupt by bumping the refcount. | |||||
*/ | |||||
if (!vblank->inmodeset) { | |||||
atomic_inc(&vblank->refcount); | |||||
vblank->inmodeset = 1; | |||||
} | |||||
spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |||||
WARN_ON(!list_empty(&dev->vblank_event_list)); | |||||
} | |||||
EXPORT_SYMBOL(drm_crtc_vblank_reset); | |||||
/** | |||||
* drm_crtc_set_max_vblank_count - configure the hw max vblank counter value | |||||
* @crtc: CRTC in question | |||||
* @max_vblank_count: max hardware vblank counter value | |||||
* | |||||
* Update the maximum hardware vblank counter value for @crtc | |||||
* at runtime. Useful for hardware where the operation of the | |||||
* hardware vblank counter depends on the currently active | |||||
* display configuration. | |||||
* | |||||
* For example, if the hardware vblank counter does not work | |||||
* when a specific connector is active the maximum can be set | |||||
* to zero. And when that specific connector isn't active the | |||||
* maximum can again be set to the appropriate non-zero value. | |||||
* | |||||
* If used, must be called before drm_vblank_on(). | |||||
*/ | |||||
void drm_crtc_set_max_vblank_count(struct drm_crtc *crtc, | |||||
u32 max_vblank_count) | |||||
{ | |||||
struct drm_device *dev = crtc->dev; | |||||
unsigned int pipe = drm_crtc_index(crtc); | |||||
struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |||||
WARN_ON(dev->max_vblank_count); | |||||
WARN_ON(!READ_ONCE(vblank->inmodeset)); | |||||
vblank->max_vblank_count = max_vblank_count; | |||||
} | |||||
EXPORT_SYMBOL(drm_crtc_set_max_vblank_count); | |||||
/** | |||||
* drm_crtc_vblank_on - enable vblank events on a CRTC | |||||
* @crtc: CRTC in question | |||||
* | |||||
* This functions restores the vblank interrupt state captured with | |||||
* drm_crtc_vblank_off() again and is generally called when enabling @crtc. Note | |||||
* that calls to drm_crtc_vblank_on() and drm_crtc_vblank_off() can be | |||||
* unbalanced and so can also be unconditionally called in driver load code to | |||||
* reflect the current hardware state of the crtc. | |||||
*/ | |||||
void drm_crtc_vblank_on(struct drm_crtc *crtc) | |||||
{ | |||||
struct drm_device *dev = crtc->dev; | |||||
unsigned int pipe = drm_crtc_index(crtc); | |||||
struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |||||
unsigned long irqflags; | |||||
if (WARN_ON(pipe >= dev->num_crtcs)) | |||||
return; | |||||
spin_lock_irqsave(&dev->vbl_lock, irqflags); | |||||
DRM_DEBUG_VBL("crtc %d, vblank enabled %d, inmodeset %d\n", | |||||
pipe, vblank->enabled, vblank->inmodeset); | |||||
/* Drop our private "prevent drm_vblank_get" refcount */ | |||||
if (vblank->inmodeset) { | |||||
atomic_dec(&vblank->refcount); | |||||
vblank->inmodeset = 0; | |||||
} | |||||
drm_reset_vblank_timestamp(dev, pipe); | |||||
/* | |||||
* re-enable interrupts if there are users left, or the | |||||
* user wishes vblank interrupts to be enabled all the time. | |||||
*/ | |||||
if (atomic_read(&vblank->refcount) != 0 || drm_vblank_offdelay == 0) | |||||
WARN_ON(drm_vblank_enable(dev, pipe)); | |||||
spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |||||
} | |||||
EXPORT_SYMBOL(drm_crtc_vblank_on); | |||||
/** | |||||
* drm_vblank_restore - estimate missed vblanks and update vblank count. | |||||
* @dev: DRM device | |||||
* @pipe: CRTC index | |||||
* | |||||
* Power manamement features can cause frame counter resets between vblank | |||||
* disable and enable. Drivers can use this function in their | |||||
* &drm_crtc_funcs.enable_vblank implementation to estimate missed vblanks since | |||||
* the last &drm_crtc_funcs.disable_vblank using timestamps and update the | |||||
* vblank counter. | |||||
* | |||||
* This function is the legacy version of drm_crtc_vblank_restore(). | |||||
*/ | |||||
void drm_vblank_restore(struct drm_device *dev, unsigned int pipe) | |||||
{ | |||||
ktime_t t_vblank; | |||||
struct drm_vblank_crtc *vblank; | |||||
int framedur_ns; | |||||
u64 diff_ns; | |||||
u32 cur_vblank, diff = 1; | |||||
int count = DRM_TIMESTAMP_MAXRETRIES; | |||||
if (WARN_ON(pipe >= dev->num_crtcs)) | |||||
return; | |||||
assert_spin_locked(&dev->vbl_lock); | |||||
assert_spin_locked(&dev->vblank_time_lock); | |||||
vblank = &dev->vblank[pipe]; | |||||
WARN_ONCE((drm_debug & DRM_UT_VBL) && !vblank->framedur_ns, | |||||
"Cannot compute missed vblanks without frame duration\n"); | |||||
framedur_ns = vblank->framedur_ns; | |||||
do { | |||||
cur_vblank = __get_vblank_counter(dev, pipe); | |||||
drm_get_last_vbltimestamp(dev, pipe, &t_vblank, false); | |||||
} while (cur_vblank != __get_vblank_counter(dev, pipe) && --count > 0); | |||||
diff_ns = ktime_to_ns(ktime_sub(t_vblank, vblank->time)); | |||||
if (framedur_ns) | |||||
diff = DIV_ROUND_CLOSEST_ULL(diff_ns, framedur_ns); | |||||
DRM_DEBUG_VBL("missed %d vblanks in %lld ns, frame duration=%d ns, hw_diff=%d\n", | |||||
diff, diff_ns, framedur_ns, cur_vblank - vblank->last); | |||||
store_vblank(dev, pipe, diff, t_vblank, cur_vblank); | |||||
} | |||||
EXPORT_SYMBOL(drm_vblank_restore); | |||||
/** | |||||
* drm_crtc_vblank_restore - estimate missed vblanks and update vblank count. | |||||
* @crtc: CRTC in question | |||||
* | |||||
* Power manamement features can cause frame counter resets between vblank | |||||
* disable and enable. Drivers can use this function in their | |||||
* &drm_crtc_funcs.enable_vblank implementation to estimate missed vblanks since | |||||
* the last &drm_crtc_funcs.disable_vblank using timestamps and update the | |||||
* vblank counter. | |||||
*/ | |||||
void drm_crtc_vblank_restore(struct drm_crtc *crtc) | |||||
{ | |||||
drm_vblank_restore(crtc->dev, drm_crtc_index(crtc)); | |||||
} | |||||
EXPORT_SYMBOL(drm_crtc_vblank_restore); | |||||
static void drm_legacy_vblank_pre_modeset(struct drm_device *dev, | |||||
unsigned int pipe) | |||||
{ | |||||
struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |||||
/* vblank is not initialized (IRQ not installed ?), or has been freed */ | |||||
if (!dev->num_crtcs) | |||||
return; | |||||
if (WARN_ON(pipe >= dev->num_crtcs)) | |||||
return; | |||||
/* | |||||
* To avoid all the problems that might happen if interrupts | |||||
* were enabled/disabled around or between these calls, we just | |||||
* have the kernel take a reference on the CRTC (just once though | |||||
* to avoid corrupting the count if multiple, mismatch calls occur), | |||||
* so that interrupts remain enabled in the interim. | |||||
*/ | |||||
if (!vblank->inmodeset) { | |||||
vblank->inmodeset = 0x1; | |||||
if (drm_vblank_get(dev, pipe) == 0) | |||||
vblank->inmodeset |= 0x2; | |||||
} | |||||
} | |||||
static void drm_legacy_vblank_post_modeset(struct drm_device *dev, | |||||
unsigned int pipe) | |||||
{ | |||||
struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |||||
unsigned long irqflags; | |||||
/* vblank is not initialized (IRQ not installed ?), or has been freed */ | |||||
if (!dev->num_crtcs) | |||||
return; | |||||
if (WARN_ON(pipe >= dev->num_crtcs)) | |||||
return; | |||||
if (vblank->inmodeset) { | |||||
spin_lock_irqsave(&dev->vbl_lock, irqflags); | |||||
drm_reset_vblank_timestamp(dev, pipe); | |||||
spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |||||
if (vblank->inmodeset & 0x2) | |||||
drm_vblank_put(dev, pipe); | |||||
vblank->inmodeset = 0; | |||||
} | |||||
} | |||||
int drm_legacy_modeset_ctl_ioctl(struct drm_device *dev, void *data, | |||||
struct drm_file *file_priv) | |||||
{ | |||||
struct drm_modeset_ctl *modeset = data; | |||||
unsigned int pipe; | |||||
/* If drm_vblank_init() hasn't been called yet, just no-op */ | |||||
if (!dev->num_crtcs) | |||||
return 0; | |||||
/* KMS drivers handle this internally */ | |||||
if (!drm_core_check_feature(dev, DRIVER_LEGACY)) | |||||
return 0; | |||||
pipe = modeset->crtc; | |||||
if (pipe >= dev->num_crtcs) | |||||
return -EINVAL; | |||||
switch (modeset->cmd) { | |||||
case _DRM_PRE_MODESET: | |||||
drm_legacy_vblank_pre_modeset(dev, pipe); | |||||
break; | |||||
case _DRM_POST_MODESET: | |||||
drm_legacy_vblank_post_modeset(dev, pipe); | |||||
break; | |||||
default: | |||||
return -EINVAL; | |||||
} | |||||
return 0; | |||||
} | |||||
static inline bool vblank_passed(u64 seq, u64 ref) | |||||
{ | |||||
return (seq - ref) <= (1 << 23); | |||||
} | |||||
static int drm_queue_vblank_event(struct drm_device *dev, unsigned int pipe, | |||||
u64 req_seq, | |||||
union drm_wait_vblank *vblwait, | |||||
struct drm_file *file_priv) | |||||
{ | |||||
struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |||||
struct drm_pending_vblank_event *e; | |||||
ktime_t now; | |||||
unsigned long flags; | |||||
u64 seq; | |||||
int ret; | |||||
e = kzalloc(sizeof(*e), GFP_KERNEL); | |||||
if (e == NULL) { | |||||
ret = -ENOMEM; | |||||
goto err_put; | |||||
} | |||||
e->pipe = pipe; | |||||
e->event.base.type = DRM_EVENT_VBLANK; | |||||
e->event.base.length = sizeof(e->event.vbl); | |||||
e->event.vbl.user_data = vblwait->request.signal; | |||||
e->event.vbl.crtc_id = 0; | |||||
if (drm_core_check_feature(dev, DRIVER_MODESET)) { | |||||
struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe); | |||||
if (crtc) | |||||
e->event.vbl.crtc_id = crtc->base.id; | |||||
} | |||||
spin_lock_irqsave(&dev->event_lock, flags); | |||||
/* | |||||
* drm_crtc_vblank_off() might have been called after we called | |||||
* drm_vblank_get(). drm_crtc_vblank_off() holds event_lock around the | |||||
* vblank disable, so no need for further locking. The reference from | |||||
* drm_vblank_get() protects against vblank disable from another source. | |||||
*/ | |||||
if (!READ_ONCE(vblank->enabled)) { | |||||
ret = -EINVAL; | |||||
goto err_unlock; | |||||
} | |||||
ret = drm_event_reserve_init_locked(dev, file_priv, &e->base, | |||||
&e->event.base); | |||||
if (ret) | |||||
goto err_unlock; | |||||
seq = drm_vblank_count_and_time(dev, pipe, &now); | |||||
DRM_DEBUG("event on vblank count %llu, current %llu, crtc %u\n", | |||||
req_seq, seq, pipe); | |||||
trace_drm_vblank_event_queued(file_priv, pipe, req_seq); | |||||
e->sequence = req_seq; | |||||
if (vblank_passed(seq, req_seq)) { | |||||
drm_vblank_put(dev, pipe); | |||||
send_vblank_event(dev, e, seq, now); | |||||
vblwait->reply.sequence = seq; | |||||
} else { | |||||
/* drm_handle_vblank_events will call drm_vblank_put */ | |||||
list_add_tail(&e->base.link, &dev->vblank_event_list); | |||||
vblwait->reply.sequence = req_seq; | |||||
} | |||||
spin_unlock_irqrestore(&dev->event_lock, flags); | |||||
return 0; | |||||
err_unlock: | |||||
spin_unlock_irqrestore(&dev->event_lock, flags); | |||||
kfree(e); | |||||
err_put: | |||||
drm_vblank_put(dev, pipe); | |||||
return ret; | |||||
} | |||||
static bool drm_wait_vblank_is_query(union drm_wait_vblank *vblwait) | |||||
{ | |||||
if (vblwait->request.sequence) | |||||
return false; | |||||
return _DRM_VBLANK_RELATIVE == | |||||
(vblwait->request.type & (_DRM_VBLANK_TYPES_MASK | | |||||
_DRM_VBLANK_EVENT | | |||||
_DRM_VBLANK_NEXTONMISS)); | |||||
} | |||||
/* | |||||
* Widen a 32-bit param to 64-bits. | |||||
* | |||||
* \param narrow 32-bit value (missing upper 32 bits) | |||||
* \param near 64-bit value that should be 'close' to near | |||||
* | |||||
* This function returns a 64-bit value using the lower 32-bits from | |||||
* 'narrow' and constructing the upper 32-bits so that the result is | |||||
* as close as possible to 'near'. | |||||
*/ | |||||
static u64 widen_32_to_64(u32 narrow, u64 near) | |||||
{ | |||||
return near + (s32) (narrow - near); | |||||
} | |||||
static void drm_wait_vblank_reply(struct drm_device *dev, unsigned int pipe, | |||||
struct drm_wait_vblank_reply *reply) | |||||
{ | |||||
ktime_t now; | |||||
struct timespec64 ts; | |||||
/* | |||||
* drm_wait_vblank_reply is a UAPI structure that uses 'long' | |||||
* to store the seconds. This is safe as we always use monotonic | |||||
* timestamps since linux-4.15. | |||||
*/ | |||||
reply->sequence = drm_vblank_count_and_time(dev, pipe, &now); | |||||
ts = ktime_to_timespec64(now); | |||||
reply->tval_sec = (u32)ts.tv_sec; | |||||
reply->tval_usec = ts.tv_nsec / 1000; | |||||
} | |||||
int drm_wait_vblank_ioctl(struct drm_device *dev, void *data, | |||||
struct drm_file *file_priv) | |||||
{ | |||||
struct drm_crtc *crtc; | |||||
struct drm_vblank_crtc *vblank; | |||||
union drm_wait_vblank *vblwait = data; | |||||
int ret; | |||||
u64 req_seq, seq; | |||||
unsigned int pipe_index; | |||||
unsigned int flags, pipe, high_pipe; | |||||
if (!dev->irq_enabled) | |||||
return -EINVAL; | |||||
if (vblwait->request.type & _DRM_VBLANK_SIGNAL) | |||||
return -EINVAL; | |||||
if (vblwait->request.type & | |||||
~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | | |||||
_DRM_VBLANK_HIGH_CRTC_MASK)) { | |||||
DRM_DEBUG("Unsupported type value 0x%x, supported mask 0x%x\n", | |||||
vblwait->request.type, | |||||
(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | | |||||
_DRM_VBLANK_HIGH_CRTC_MASK)); | |||||
return -EINVAL; | |||||
} | |||||
flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK; | |||||
high_pipe = (vblwait->request.type & _DRM_VBLANK_HIGH_CRTC_MASK); | |||||
if (high_pipe) | |||||
pipe_index = high_pipe >> _DRM_VBLANK_HIGH_CRTC_SHIFT; | |||||
else | |||||
pipe_index = flags & _DRM_VBLANK_SECONDARY ? 1 : 0; | |||||
/* Convert lease-relative crtc index into global crtc index */ | |||||
if (drm_core_check_feature(dev, DRIVER_MODESET)) { | |||||
pipe = 0; | |||||
drm_for_each_crtc(crtc, dev) { | |||||
if (drm_lease_held(file_priv, crtc->base.id)) { | |||||
if (pipe_index == 0) | |||||
break; | |||||
pipe_index--; | |||||
} | |||||
pipe++; | |||||
} | |||||
} else { | |||||
pipe = pipe_index; | |||||
} | |||||
if (pipe >= dev->num_crtcs) | |||||
return -EINVAL; | |||||
vblank = &dev->vblank[pipe]; | |||||
/* If the counter is currently enabled and accurate, short-circuit | |||||
* queries to return the cached timestamp of the last vblank. | |||||
*/ | |||||
if (dev->vblank_disable_immediate && | |||||
drm_wait_vblank_is_query(vblwait) && | |||||
READ_ONCE(vblank->enabled)) { | |||||
drm_wait_vblank_reply(dev, pipe, &vblwait->reply); | |||||
return 0; | |||||
} | |||||
ret = drm_vblank_get(dev, pipe); | |||||
if (ret) { | |||||
DRM_DEBUG("crtc %d failed to acquire vblank counter, %d\n", pipe, ret); | |||||
return ret; | |||||
} | |||||
seq = drm_vblank_count(dev, pipe); | |||||
switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) { | |||||
case _DRM_VBLANK_RELATIVE: | |||||
req_seq = seq + vblwait->request.sequence; | |||||
vblwait->request.sequence = req_seq; | |||||
vblwait->request.type &= ~_DRM_VBLANK_RELATIVE; | |||||
break; | |||||
case _DRM_VBLANK_ABSOLUTE: | |||||
req_seq = widen_32_to_64(vblwait->request.sequence, seq); | |||||
break; | |||||
default: | |||||
ret = -EINVAL; | |||||
goto done; | |||||
} | |||||
if ((flags & _DRM_VBLANK_NEXTONMISS) && | |||||
vblank_passed(seq, req_seq)) { | |||||
req_seq = seq + 1; | |||||
vblwait->request.type &= ~_DRM_VBLANK_NEXTONMISS; | |||||
vblwait->request.sequence = req_seq; | |||||
} | |||||
if (flags & _DRM_VBLANK_EVENT) { | |||||
/* must hold on to the vblank ref until the event fires | |||||
* drm_vblank_put will be called asynchronously | |||||
*/ | |||||
return drm_queue_vblank_event(dev, pipe, req_seq, vblwait, file_priv); | |||||
} | |||||
if (req_seq != seq) { | |||||
int wait; | |||||
DRM_DEBUG("waiting on vblank count %llu, crtc %u\n", | |||||
req_seq, pipe); | |||||
wait = wait_event_interruptible_timeout(vblank->queue, | |||||
vblank_passed(drm_vblank_count(dev, pipe), req_seq) || | |||||
!READ_ONCE(vblank->enabled), | |||||
msecs_to_jiffies(3000)); | |||||
switch (wait) { | |||||
case 0: | |||||
/* timeout */ | |||||
ret = -EBUSY; | |||||
break; | |||||
case -ERESTARTSYS: | |||||
/* interrupted by signal */ | |||||
ret = -EINTR; | |||||
break; | |||||
default: | |||||
ret = 0; | |||||
break; | |||||
} | |||||
} | |||||
if (ret != -EINTR) { | |||||
drm_wait_vblank_reply(dev, pipe, &vblwait->reply); | |||||
DRM_DEBUG("crtc %d returning %u to client\n", | |||||
pipe, vblwait->reply.sequence); | |||||
} else { | |||||
DRM_DEBUG("crtc %d vblank wait interrupted by signal\n", pipe); | |||||
} | |||||
done: | |||||
drm_vblank_put(dev, pipe); | |||||
return ret; | |||||
} | |||||
static void drm_handle_vblank_events(struct drm_device *dev, unsigned int pipe) | |||||
{ | |||||
struct drm_pending_vblank_event *e, *t; | |||||
ktime_t now; | |||||
u64 seq; | |||||
assert_spin_locked(&dev->event_lock); | |||||
seq = drm_vblank_count_and_time(dev, pipe, &now); | |||||
list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { | |||||
if (e->pipe != pipe) | |||||
continue; | |||||
if (!vblank_passed(seq, e->sequence)) | |||||
continue; | |||||
DRM_DEBUG("vblank event on %llu, current %llu\n", | |||||
e->sequence, seq); | |||||
list_del(&e->base.link); | |||||
drm_vblank_put(dev, pipe); | |||||
send_vblank_event(dev, e, seq, now); | |||||
} | |||||
trace_drm_vblank_event(pipe, seq); | |||||
} | |||||
/** | |||||
* drm_handle_vblank - handle a vblank event | |||||
* @dev: DRM device | |||||
* @pipe: index of CRTC where this event occurred | |||||
* | |||||
* Drivers should call this routine in their vblank interrupt handlers to | |||||
* update the vblank counter and send any signals that may be pending. | |||||
* | |||||
* This is the legacy version of drm_crtc_handle_vblank(). | |||||
*/ | |||||
bool drm_handle_vblank(struct drm_device *dev, unsigned int pipe) | |||||
{ | |||||
struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |||||
unsigned long irqflags; | |||||
bool disable_irq; | |||||
if (WARN_ON_ONCE(!dev->num_crtcs)) | |||||
return false; | |||||
if (WARN_ON(pipe >= dev->num_crtcs)) | |||||
return false; | |||||
spin_lock_irqsave(&dev->event_lock, irqflags); | |||||
/* Need timestamp lock to prevent concurrent execution with | |||||
* vblank enable/disable, as this would cause inconsistent | |||||
* or corrupted timestamps and vblank counts. | |||||
*/ | |||||
spin_lock(&dev->vblank_time_lock); | |||||
/* Vblank irq handling disabled. Nothing to do. */ | |||||
if (!vblank->enabled) { | |||||
spin_unlock(&dev->vblank_time_lock); | |||||
spin_unlock_irqrestore(&dev->event_lock, irqflags); | |||||
return false; | |||||
} | |||||
drm_update_vblank_count(dev, pipe, true); | |||||
spin_unlock(&dev->vblank_time_lock); | |||||
wake_up(&vblank->queue); | |||||
/* With instant-off, we defer disabling the interrupt until after | |||||
* we finish processing the following vblank after all events have | |||||
* been signaled. The disable has to be last (after | |||||
* drm_handle_vblank_events) so that the timestamp is always accurate. | |||||
*/ | |||||
disable_irq = (dev->vblank_disable_immediate && | |||||
drm_vblank_offdelay > 0 && | |||||
!atomic_read(&vblank->refcount)); | |||||
drm_handle_vblank_events(dev, pipe); | |||||
spin_unlock_irqrestore(&dev->event_lock, irqflags); | |||||
if (disable_irq) | |||||
vblank_disable_fn(&vblank->disable_timer); | |||||
return true; | |||||
} | |||||
EXPORT_SYMBOL(drm_handle_vblank); | |||||
/** | |||||
* drm_crtc_handle_vblank - handle a vblank event | |||||
* @crtc: where this event occurred | |||||
* | |||||
* Drivers should call this routine in their vblank interrupt handlers to | |||||
* update the vblank counter and send any signals that may be pending. | |||||
* | |||||
* This is the native KMS version of drm_handle_vblank(). | |||||
* | |||||
* Returns: | |||||
* True if the event was successfully handled, false on failure. | |||||
*/ | |||||
bool drm_crtc_handle_vblank(struct drm_crtc *crtc) | |||||
{ | |||||
return drm_handle_vblank(crtc->dev, drm_crtc_index(crtc)); | |||||
} | |||||
EXPORT_SYMBOL(drm_crtc_handle_vblank); | |||||
/* | |||||
* Get crtc VBLANK count. | |||||
* | |||||
* \param dev DRM device | |||||
* \param data user arguement, pointing to a drm_crtc_get_sequence structure. | |||||
* \param file_priv drm file private for the user's open file descriptor | |||||
*/ | |||||
int drm_crtc_get_sequence_ioctl(struct drm_device *dev, void *data, | |||||
struct drm_file *file_priv) | |||||
{ | |||||
struct drm_crtc *crtc; | |||||
struct drm_vblank_crtc *vblank; | |||||
int pipe; | |||||
struct drm_crtc_get_sequence *get_seq = data; | |||||
ktime_t now; | |||||
bool vblank_enabled; | |||||
int ret; | |||||
if (!drm_core_check_feature(dev, DRIVER_MODESET)) | |||||
return -EOPNOTSUPP; | |||||
if (!dev->irq_enabled) | |||||
return -EINVAL; | |||||
crtc = drm_crtc_find(dev, file_priv, get_seq->crtc_id); | |||||
if (!crtc) | |||||
return -ENOENT; | |||||
pipe = drm_crtc_index(crtc); | |||||
vblank = &dev->vblank[pipe]; | |||||
vblank_enabled = dev->vblank_disable_immediate && READ_ONCE(vblank->enabled); | |||||
if (!vblank_enabled) { | |||||
ret = drm_crtc_vblank_get(crtc); | |||||
if (ret) { | |||||
DRM_DEBUG("crtc %d failed to acquire vblank counter, %d\n", pipe, ret); | |||||
return ret; | |||||
} | |||||
} | |||||
drm_modeset_lock(&crtc->mutex, NULL); | |||||
if (crtc->state) | |||||
get_seq->active = crtc->state->enable; | |||||
else | |||||
get_seq->active = crtc->enabled; | |||||
drm_modeset_unlock(&crtc->mutex); | |||||
get_seq->sequence = drm_vblank_count_and_time(dev, pipe, &now); | |||||
get_seq->sequence_ns = ktime_to_ns(now); | |||||
if (!vblank_enabled) | |||||
drm_crtc_vblank_put(crtc); | |||||
return 0; | |||||
} | |||||
/* | |||||
* Queue a event for VBLANK sequence | |||||
* | |||||
* \param dev DRM device | |||||
* \param data user arguement, pointing to a drm_crtc_queue_sequence structure. | |||||
* \param file_priv drm file private for the user's open file descriptor | |||||
*/ | |||||
int drm_crtc_queue_sequence_ioctl(struct drm_device *dev, void *data, | |||||
struct drm_file *file_priv) | |||||
{ | |||||
struct drm_crtc *crtc; | |||||
struct drm_vblank_crtc *vblank; | |||||
int pipe; | |||||
struct drm_crtc_queue_sequence *queue_seq = data; | |||||
ktime_t now; | |||||
struct drm_pending_vblank_event *e; | |||||
u32 flags; | |||||
u64 seq; | |||||
u64 req_seq; | |||||
int ret; | |||||
unsigned long spin_flags; | |||||
if (!drm_core_check_feature(dev, DRIVER_MODESET)) | |||||
return -EOPNOTSUPP; | |||||
if (!dev->irq_enabled) | |||||
return -EINVAL; | |||||
crtc = drm_crtc_find(dev, file_priv, queue_seq->crtc_id); | |||||
if (!crtc) | |||||
return -ENOENT; | |||||
flags = queue_seq->flags; | |||||
/* Check valid flag bits */ | |||||
if (flags & ~(DRM_CRTC_SEQUENCE_RELATIVE| | |||||
DRM_CRTC_SEQUENCE_NEXT_ON_MISS)) | |||||
return -EINVAL; | |||||
pipe = drm_crtc_index(crtc); | |||||
vblank = &dev->vblank[pipe]; | |||||
e = kzalloc(sizeof(*e), GFP_KERNEL); | |||||
if (e == NULL) | |||||
return -ENOMEM; | |||||
ret = drm_crtc_vblank_get(crtc); | |||||
if (ret) { | |||||
DRM_DEBUG("crtc %d failed to acquire vblank counter, %d\n", pipe, ret); | |||||
goto err_free; | |||||
} | |||||
seq = drm_vblank_count_and_time(dev, pipe, &now); | |||||
req_seq = queue_seq->sequence; | |||||
if (flags & DRM_CRTC_SEQUENCE_RELATIVE) | |||||
req_seq += seq; | |||||
if ((flags & DRM_CRTC_SEQUENCE_NEXT_ON_MISS) && vblank_passed(seq, req_seq)) | |||||
req_seq = seq + 1; | |||||
e->pipe = pipe; | |||||
e->event.base.type = DRM_EVENT_CRTC_SEQUENCE; | |||||
e->event.base.length = sizeof(e->event.seq); | |||||
e->event.seq.user_data = queue_seq->user_data; | |||||
spin_lock_irqsave(&dev->event_lock, spin_flags); | |||||
/* | |||||
* drm_crtc_vblank_off() might have been called after we called | |||||
* drm_crtc_vblank_get(). drm_crtc_vblank_off() holds event_lock around the | |||||
* vblank disable, so no need for further locking. The reference from | |||||
* drm_crtc_vblank_get() protects against vblank disable from another source. | |||||
*/ | |||||
if (!READ_ONCE(vblank->enabled)) { | |||||
ret = -EINVAL; | |||||
goto err_unlock; | |||||
} | |||||
ret = drm_event_reserve_init_locked(dev, file_priv, &e->base, | |||||
&e->event.base); | |||||
if (ret) | |||||
goto err_unlock; | |||||
e->sequence = req_seq; | |||||
if (vblank_passed(seq, req_seq)) { | |||||
drm_crtc_vblank_put(crtc); | |||||
send_vblank_event(dev, e, seq, now); | |||||
queue_seq->sequence = seq; | |||||
} else { | |||||
/* drm_handle_vblank_events will call drm_vblank_put */ | |||||
list_add_tail(&e->base.link, &dev->vblank_event_list); | |||||
queue_seq->sequence = req_seq; | |||||
} | |||||
spin_unlock_irqrestore(&dev->event_lock, spin_flags); | |||||
return 0; | |||||
err_unlock: | |||||
spin_unlock_irqrestore(&dev->event_lock, spin_flags); | |||||
drm_crtc_vblank_put(crtc); | |||||
err_free: | |||||
kfree(e); | |||||
return ret; | |||||
} |