diff options
Diffstat (limited to 'ANDROID_3.4.5/drivers/gpu/drm/drm_irq.c')
| -rw-r--r-- | ANDROID_3.4.5/drivers/gpu/drm/drm_irq.c | 1348 |
1 files changed, 0 insertions, 1348 deletions
diff --git a/ANDROID_3.4.5/drivers/gpu/drm/drm_irq.c b/ANDROID_3.4.5/drivers/gpu/drm/drm_irq.c deleted file mode 100644 index c869436e..00000000 --- a/ANDROID_3.4.5/drivers/gpu/drm/drm_irq.c +++ /dev/null @@ -1,1348 +0,0 @@ -/** - * \file drm_irq.c - * IRQ support - * - * \author Rickard E. (Rik) Faith <faith@valinux.com> - * \author Gareth Hughes <gareth@valinux.com> - */ - -/* - * Created: Fri Mar 19 14:30:16 1999 by faith@valinux.com - * - * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas. - * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. - * All Rights Reserved. - * - * 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 "drmP.h" -#include "drm_trace.h" - -#include <linux/interrupt.h> /* For task queue support */ -#include <linux/slab.h> - -#include <linux/vgaarb.h> -#include <linux/export.h> - -/* Access macro for slots in vblank timestamp ringbuffer. */ -#define vblanktimestamp(dev, crtc, count) ( \ - (dev)->_vblank_time[(crtc) * DRM_VBLANKTIME_RBSIZE + \ - ((count) % DRM_VBLANKTIME_RBSIZE)]) - -/* 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 - -/** - * Get interrupt from bus id. - * - * \param inode device inode. - * \param file_priv DRM file private. - * \param cmd command. - * \param arg user argument, pointing to a drm_irq_busid structure. - * \return zero on success or a negative number on failure. - * - * Finds the PCI device with the specified bus id and gets its IRQ number. - * This IOCTL is deprecated, and will now return EINVAL for any busid not equal - * to that of the device that this DRM instance attached to. - */ -int drm_irq_by_busid(struct drm_device *dev, void *data, - struct drm_file *file_priv) -{ - struct drm_irq_busid *p = data; - - if (!dev->driver->bus->irq_by_busid) - return -EINVAL; - - if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) - return -EINVAL; - - return dev->driver->bus->irq_by_busid(dev, p); -} - -/* - * Clear vblank timestamp buffer for a crtc. - */ -static void clear_vblank_timestamps(struct drm_device *dev, int crtc) -{ - memset(&dev->_vblank_time[crtc * DRM_VBLANKTIME_RBSIZE], 0, - DRM_VBLANKTIME_RBSIZE * sizeof(struct timeval)); -} - -/* - * 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, int crtc) -{ - unsigned long irqflags; - u32 vblcount; - s64 diff_ns; - int vblrc; - struct timeval tvblank; - - /* 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); - - dev->driver->disable_vblank(dev, crtc); - dev->vblank_enabled[crtc] = 0; - - /* No further vblank irq's will be processed after - * this point. Get current hardware vblank count and - * vblank timestamp, repeat until they are consistent. - * - * FIXME: There is still a race condition here and in - * drm_update_vblank_count() which can cause off-by-one - * reinitialization of software vblank counter. If gpu - * vblank counter doesn't increment exactly at the leading - * edge of a vblank interval, then we can lose 1 count if - * we happen to execute between start of vblank and the - * delayed gpu counter increment. - */ - do { - dev->last_vblank[crtc] = dev->driver->get_vblank_counter(dev, crtc); - vblrc = drm_get_last_vbltimestamp(dev, crtc, &tvblank, 0); - } while (dev->last_vblank[crtc] != dev->driver->get_vblank_counter(dev, crtc)); - - /* Compute time difference to stored timestamp of last vblank - * as updated by last invocation of drm_handle_vblank() in vblank irq. - */ - vblcount = atomic_read(&dev->_vblank_count[crtc]); - diff_ns = timeval_to_ns(&tvblank) - - timeval_to_ns(&vblanktimestamp(dev, crtc, vblcount)); - - /* If there is at least 1 msec difference between the last stored - * timestamp and tvblank, then we are currently executing our - * disable inside a new vblank interval, the tvblank timestamp - * corresponds to this new vblank interval and the irq handler - * for this vblank didn't run yet and won't run due to our disable. - * Therefore we need to do the job of drm_handle_vblank() and - * increment the vblank counter by one to account for this vblank. - * - * Skip this step if there isn't any high precision timestamp - * available. In that case we can't account for this and just - * hope for the best. - */ - if ((vblrc > 0) && (abs64(diff_ns) > 1000000)) { - atomic_inc(&dev->_vblank_count[crtc]); - smp_mb__after_atomic_inc(); - } - - /* Invalidate all timestamps while vblank irq's are off. */ - clear_vblank_timestamps(dev, crtc); - - spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); -} - -static void vblank_disable_fn(unsigned long arg) -{ - struct drm_device *dev = (struct drm_device *)arg; - unsigned long irqflags; - int i; - - if (!dev->vblank_disable_allowed) - return; - - for (i = 0; i < dev->num_crtcs; i++) { - spin_lock_irqsave(&dev->vbl_lock, irqflags); - if (atomic_read(&dev->vblank_refcount[i]) == 0 && - dev->vblank_enabled[i]) { - DRM_DEBUG("disabling vblank on crtc %d\n", i); - vblank_disable_and_save(dev, i); - } - spin_unlock_irqrestore(&dev->vbl_lock, irqflags); - } -} - -void drm_vblank_cleanup(struct drm_device *dev) -{ - /* Bail if the driver didn't call drm_vblank_init() */ - if (dev->num_crtcs == 0) - return; - - del_timer(&dev->vblank_disable_timer); - - vblank_disable_fn((unsigned long)dev); - - kfree(dev->vbl_queue); - kfree(dev->_vblank_count); - kfree(dev->vblank_refcount); - kfree(dev->vblank_enabled); - kfree(dev->last_vblank); - kfree(dev->last_vblank_wait); - kfree(dev->vblank_inmodeset); - kfree(dev->_vblank_time); - - dev->num_crtcs = 0; -} -EXPORT_SYMBOL(drm_vblank_cleanup); - -int drm_vblank_init(struct drm_device *dev, int num_crtcs) -{ - int i, ret = -ENOMEM; - - setup_timer(&dev->vblank_disable_timer, vblank_disable_fn, - (unsigned long)dev); - spin_lock_init(&dev->vbl_lock); - spin_lock_init(&dev->vblank_time_lock); - - dev->num_crtcs = num_crtcs; - - dev->vbl_queue = kmalloc(sizeof(wait_queue_head_t) * num_crtcs, - GFP_KERNEL); - if (!dev->vbl_queue) - goto err; - - dev->_vblank_count = kmalloc(sizeof(atomic_t) * num_crtcs, GFP_KERNEL); - if (!dev->_vblank_count) - goto err; - - dev->vblank_refcount = kmalloc(sizeof(atomic_t) * num_crtcs, - GFP_KERNEL); - if (!dev->vblank_refcount) - goto err; - - dev->vblank_enabled = kcalloc(num_crtcs, sizeof(int), GFP_KERNEL); - if (!dev->vblank_enabled) - goto err; - - dev->last_vblank = kcalloc(num_crtcs, sizeof(u32), GFP_KERNEL); - if (!dev->last_vblank) - goto err; - - dev->last_vblank_wait = kcalloc(num_crtcs, sizeof(u32), GFP_KERNEL); - if (!dev->last_vblank_wait) - goto err; - - dev->vblank_inmodeset = kcalloc(num_crtcs, sizeof(int), GFP_KERNEL); - if (!dev->vblank_inmodeset) - goto err; - - dev->_vblank_time = kcalloc(num_crtcs * DRM_VBLANKTIME_RBSIZE, - sizeof(struct timeval), GFP_KERNEL); - if (!dev->_vblank_time) - goto err; - - DRM_INFO("Supports vblank timestamp caching Rev 1 (10.10.2010).\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"); - - /* Zero per-crtc vblank stuff */ - for (i = 0; i < num_crtcs; i++) { - init_waitqueue_head(&dev->vbl_queue[i]); - atomic_set(&dev->_vblank_count[i], 0); - atomic_set(&dev->vblank_refcount[i], 0); - } - - dev->vblank_disable_allowed = 0; - return 0; - -err: - drm_vblank_cleanup(dev); - return ret; -} -EXPORT_SYMBOL(drm_vblank_init); - -static void drm_irq_vgaarb_nokms(void *cookie, bool state) -{ - struct drm_device *dev = cookie; - - if (dev->driver->vgaarb_irq) { - dev->driver->vgaarb_irq(dev, state); - return; - } - - if (!dev->irq_enabled) - return; - - if (state) { - if (dev->driver->irq_uninstall) - dev->driver->irq_uninstall(dev); - } else { - if (dev->driver->irq_preinstall) - dev->driver->irq_preinstall(dev); - if (dev->driver->irq_postinstall) - dev->driver->irq_postinstall(dev); - } -} - -/** - * Install IRQ handler. - * - * \param dev DRM device. - * - * Initializes the IRQ related data. Installs the handler, calling the driver - * \c irq_preinstall() and \c irq_postinstall() functions - * before and after the installation. - */ -int drm_irq_install(struct drm_device *dev) -{ - int ret = 0; - unsigned long sh_flags = 0; - char *irqname; - - if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) - return -EINVAL; - - if (drm_dev_to_irq(dev) == 0) - return -EINVAL; - - mutex_lock(&dev->struct_mutex); - - /* Driver must have been initialized */ - if (!dev->dev_private) { - mutex_unlock(&dev->struct_mutex); - return -EINVAL; - } - - if (dev->irq_enabled) { - mutex_unlock(&dev->struct_mutex); - return -EBUSY; - } - dev->irq_enabled = 1; - mutex_unlock(&dev->struct_mutex); - - DRM_DEBUG("irq=%d\n", drm_dev_to_irq(dev)); - - /* Before installing handler */ - if (dev->driver->irq_preinstall) - dev->driver->irq_preinstall(dev); - - /* Install handler */ - if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED)) - sh_flags = IRQF_SHARED; - - if (dev->devname) - irqname = dev->devname; - else - irqname = dev->driver->name; - - ret = request_irq(drm_dev_to_irq(dev), dev->driver->irq_handler, - sh_flags, irqname, dev); - - if (ret < 0) { - mutex_lock(&dev->struct_mutex); - dev->irq_enabled = 0; - mutex_unlock(&dev->struct_mutex); - return ret; - } - - if (!drm_core_check_feature(dev, DRIVER_MODESET)) - vga_client_register(dev->pdev, (void *)dev, drm_irq_vgaarb_nokms, NULL); - - /* After installing handler */ - if (dev->driver->irq_postinstall) - ret = dev->driver->irq_postinstall(dev); - - if (ret < 0) { - mutex_lock(&dev->struct_mutex); - dev->irq_enabled = 0; - mutex_unlock(&dev->struct_mutex); - if (!drm_core_check_feature(dev, DRIVER_MODESET)) - vga_client_register(dev->pdev, NULL, NULL, NULL); - free_irq(drm_dev_to_irq(dev), dev); - } - - return ret; -} -EXPORT_SYMBOL(drm_irq_install); - -/** - * Uninstall the IRQ handler. - * - * \param dev DRM device. - * - * Calls the driver's \c irq_uninstall() function, and stops the irq. - */ -int drm_irq_uninstall(struct drm_device *dev) -{ - unsigned long irqflags; - int irq_enabled, i; - - if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) - return -EINVAL; - - mutex_lock(&dev->struct_mutex); - irq_enabled = dev->irq_enabled; - dev->irq_enabled = 0; - mutex_unlock(&dev->struct_mutex); - - /* - * Wake up any waiters so they don't hang. - */ - if (dev->num_crtcs) { - spin_lock_irqsave(&dev->vbl_lock, irqflags); - for (i = 0; i < dev->num_crtcs; i++) { - DRM_WAKEUP(&dev->vbl_queue[i]); - dev->vblank_enabled[i] = 0; - dev->last_vblank[i] = - dev->driver->get_vblank_counter(dev, i); - } - spin_unlock_irqrestore(&dev->vbl_lock, irqflags); - } - - if (!irq_enabled) - return -EINVAL; - - DRM_DEBUG("irq=%d\n", drm_dev_to_irq(dev)); - - if (!drm_core_check_feature(dev, DRIVER_MODESET)) - vga_client_register(dev->pdev, NULL, NULL, NULL); - - if (dev->driver->irq_uninstall) - dev->driver->irq_uninstall(dev); - - free_irq(drm_dev_to_irq(dev), dev); - - return 0; -} -EXPORT_SYMBOL(drm_irq_uninstall); - -/** - * IRQ control ioctl. - * - * \param inode device inode. - * \param file_priv DRM file private. - * \param cmd command. - * \param arg user argument, pointing to a drm_control structure. - * \return zero on success or a negative number on failure. - * - * Calls irq_install() or irq_uninstall() according to \p arg. - */ -int drm_control(struct drm_device *dev, void *data, - struct drm_file *file_priv) -{ - struct drm_control *ctl = data; - - /* if we haven't irq we fallback for compatibility reasons - - * this used to be a separate function in drm_dma.h - */ - - - switch (ctl->func) { - case DRM_INST_HANDLER: - if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) - return 0; - if (drm_core_check_feature(dev, DRIVER_MODESET)) - return 0; - if (dev->if_version < DRM_IF_VERSION(1, 2) && - ctl->irq != drm_dev_to_irq(dev)) - return -EINVAL; - return drm_irq_install(dev); - case DRM_UNINST_HANDLER: - if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) - return 0; - if (drm_core_check_feature(dev, DRIVER_MODESET)) - return 0; - return drm_irq_uninstall(dev); - default: - return -EINVAL; - } -} - -/** - * drm_calc_timestamping_constants - 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. - * - * @crtc drm_crtc whose timestamp constants should be updated. - * - */ -void drm_calc_timestamping_constants(struct drm_crtc *crtc) -{ - s64 linedur_ns = 0, pixeldur_ns = 0, framedur_ns = 0; - u64 dotclock; - - /* Dot clock in Hz: */ - dotclock = (u64) crtc->hwmode.clock * 1000; - - /* Fields of interlaced scanout modes are only halve a frame duration. - * Double the dotclock to get halve the frame-/line-/pixelduration. - */ - if (crtc->hwmode.flags & DRM_MODE_FLAG_INTERLACE) - dotclock *= 2; - - /* Valid dotclock? */ - if (dotclock > 0) { - /* Convert scanline length in pixels and video dot clock to - * line duration, frame duration and pixel duration in - * nanoseconds: - */ - pixeldur_ns = (s64) div64_u64(1000000000, dotclock); - linedur_ns = (s64) div64_u64(((u64) crtc->hwmode.crtc_htotal * - 1000000000), dotclock); - framedur_ns = (s64) crtc->hwmode.crtc_vtotal * linedur_ns; - } else - DRM_ERROR("crtc %d: Can't calculate constants, dotclock = 0!\n", - crtc->base.id); - - crtc->pixeldur_ns = pixeldur_ns; - crtc->linedur_ns = linedur_ns; - crtc->framedur_ns = framedur_ns; - - DRM_DEBUG("crtc %d: hwmode: htotal %d, vtotal %d, vdisplay %d\n", - crtc->base.id, crtc->hwmode.crtc_htotal, - crtc->hwmode.crtc_vtotal, crtc->hwmode.crtc_vdisplay); - DRM_DEBUG("crtc %d: clock %d kHz framedur %d linedur %d, pixeldur %d\n", - crtc->base.id, (int) dotclock/1000, (int) framedur_ns, - (int) linedur_ns, (int) pixeldur_ns); -} -EXPORT_SYMBOL(drm_calc_timestamping_constants); - -/** - * drm_calc_vbltimestamp_from_scanoutpos - helper routine for kms - * drivers. 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. - * - * @dev: DRM device. - * @crtc: Which crtc's 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. - * @flags: Flags to pass to driver: - * 0 = Default. - * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl irq handler. - * @refcrtc: drm_crtc* of crtc which defines scanout timing. - * - * Returns negative value on error, failure or if not supported in current - * video mode: - * - * -EINVAL - Invalid crtc. - * -EAGAIN - Temporary unavailable, e.g., called before initial modeset. - * -ENOTSUPP - Function not supported in current display mode. - * -EIO - Failed, e.g., due to failed scanout position query. - * - * Returns or'ed positive status flags on success: - * - * DRM_VBLANKTIME_SCANOUTPOS_METHOD - Signal this method used for timestamping. - * DRM_VBLANKTIME_INVBL - Timestamp taken while scanout was in vblank interval. - * - */ -int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, int crtc, - int *max_error, - struct timeval *vblank_time, - unsigned flags, - struct drm_crtc *refcrtc) -{ - struct timeval stime, raw_time; - struct drm_display_mode *mode; - int vbl_status, vtotal, vdisplay; - int vpos, hpos, i; - s64 framedur_ns, linedur_ns, pixeldur_ns, delta_ns, duration_ns; - bool invbl; - - if (crtc < 0 || crtc >= dev->num_crtcs) { - DRM_ERROR("Invalid crtc %d\n", crtc); - return -EINVAL; - } - - /* 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 -EIO; - } - - mode = &refcrtc->hwmode; - vtotal = mode->crtc_vtotal; - vdisplay = mode->crtc_vdisplay; - - /* Durations of frames, lines, pixels in nanoseconds. */ - framedur_ns = refcrtc->framedur_ns; - linedur_ns = refcrtc->linedur_ns; - pixeldur_ns = refcrtc->pixeldur_ns; - - /* If mode timing undefined, just return as no-op: - * Happens during initial modesetting of a crtc. - */ - if (vtotal <= 0 || vdisplay <= 0 || framedur_ns == 0) { - DRM_DEBUG("crtc %d: Noop due to uninitialized mode.\n", crtc); - return -EAGAIN; - } - - /* 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++) { - /* Disable preemption to make it very likely to - * succeed in the first iteration even on PREEMPT_RT kernel. - */ - preempt_disable(); - - /* Get system timestamp before query. */ - do_gettimeofday(&stime); - - /* Get vertical and horizontal scanout pos. vpos, hpos. */ - vbl_status = dev->driver->get_scanout_position(dev, crtc, &vpos, &hpos); - - /* Get system timestamp after query. */ - do_gettimeofday(&raw_time); - - preempt_enable(); - - /* Return as no-op if scanout query unsupported or failed. */ - if (!(vbl_status & DRM_SCANOUTPOS_VALID)) { - DRM_DEBUG("crtc %d : scanoutpos query failed [%d].\n", - crtc, vbl_status); - return -EIO; - } - - duration_ns = timeval_to_ns(&raw_time) - timeval_to_ns(&stime); - - /* Accept result with < max_error nsecs timing uncertainty. */ - if (duration_ns <= (s64) *max_error) - break; - } - - /* Noisy system timing? */ - if (i == DRM_TIMESTAMP_MAXRETRIES) { - DRM_DEBUG("crtc %d: Noisy timestamp %d us > %d us [%d reps].\n", - crtc, (int) duration_ns/1000, *max_error/1000, i); - } - - /* Return upper bound of timestamp precision error. */ - *max_error = (int) duration_ns; - - /* Check if in vblank area: - * vpos is >=0 in video scanout area, but negative - * within vblank area, counting down the number of lines until - * start of scanout. - */ - invbl = vbl_status & DRM_SCANOUTPOS_INVBL; - - /* 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 = (s64) vpos * linedur_ns + (s64) hpos * pixeldur_ns; - - /* Is vpos outside nominal vblank area, but less than - * 1/100 of a frame height away from start of vblank? - * If so, assume this isn't a massively delayed vblank - * interrupt, but a vblank interrupt that fired a few - * microseconds before true start of vblank. Compensate - * by adding a full frame duration to the final timestamp. - * Happens, e.g., on ATI R500, R600. - * - * We only do this if DRM_CALLED_FROM_VBLIRQ. - */ - if ((flags & DRM_CALLED_FROM_VBLIRQ) && !invbl && - ((vdisplay - vpos) < vtotal / 100)) { - delta_ns = delta_ns - framedur_ns; - - /* Signal this correction as "applied". */ - vbl_status |= 0x8; - } - - /* Subtract time delta from raw timestamp to get final - * vblank_time timestamp for end of vblank. - */ - *vblank_time = ns_to_timeval(timeval_to_ns(&raw_time) - delta_ns); - - DRM_DEBUG("crtc %d : v %d p(%d,%d)@ %ld.%ld -> %ld.%ld [e %d us, %d rep]\n", - crtc, (int)vbl_status, hpos, vpos, - (long)raw_time.tv_sec, (long)raw_time.tv_usec, - (long)vblank_time->tv_sec, (long)vblank_time->tv_usec, - (int)duration_ns/1000, i); - - vbl_status = DRM_VBLANKTIME_SCANOUTPOS_METHOD; - if (invbl) - vbl_status |= DRM_VBLANKTIME_INVBL; - - return vbl_status; -} -EXPORT_SYMBOL(drm_calc_vbltimestamp_from_scanoutpos); - -/** - * drm_get_last_vbltimestamp - retrieve raw timestamp for the most recent - * vblank interval. - * - * @dev: DRM device - * @crtc: which crtc's vblank timestamp to retrieve - * @tvblank: Pointer to target struct timeval which should receive the timestamp - * @flags: Flags to pass to driver: - * 0 = Default. - * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl irq handler. - * - * 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 non-zero if timestamp is considered to be very precise. - */ -u32 drm_get_last_vbltimestamp(struct drm_device *dev, int crtc, - struct timeval *tvblank, unsigned flags) -{ - int ret = 0; - - /* 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, crtc, &max_error, - tvblank, flags); - if (ret > 0) - return (u32) ret; - } - - /* GPU high precision timestamp query unsupported or failed. - * Return gettimeofday timestamp as best estimate. - */ - do_gettimeofday(tvblank); - - return 0; -} -EXPORT_SYMBOL(drm_get_last_vbltimestamp); - -/** - * drm_vblank_count - retrieve "cooked" vblank counter value - * @dev: DRM device - * @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. - */ -u32 drm_vblank_count(struct drm_device *dev, int crtc) -{ - return atomic_read(&dev->_vblank_count[crtc]); -} -EXPORT_SYMBOL(drm_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 - * @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 value vblank counter - * value. - */ -u32 drm_vblank_count_and_time(struct drm_device *dev, int crtc, - struct timeval *vblanktime) -{ - u32 cur_vblank; - - /* Read timestamp from slot of _vblank_time ringbuffer - * that corresponds to current vblank count. Retry if - * count has incremented during readout. This works like - * a seqlock. - */ - do { - cur_vblank = atomic_read(&dev->_vblank_count[crtc]); - *vblanktime = vblanktimestamp(dev, crtc, cur_vblank); - smp_rmb(); - } while (cur_vblank != atomic_read(&dev->_vblank_count[crtc])); - - return cur_vblank; -} -EXPORT_SYMBOL(drm_vblank_count_and_time); - -/** - * drm_update_vblank_count - update the master vblank counter - * @dev: DRM device - * @crtc: counter to update - * - * Call back into the driver to update the appropriate vblank counter - * (specified by @crtc). 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 dev->vbl_lock since this reads & writes - * device vblank fields. - */ -static void drm_update_vblank_count(struct drm_device *dev, int crtc) -{ - u32 cur_vblank, diff, tslot, rc; - struct timeval t_vblank; - - /* - * 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 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 = dev->driver->get_vblank_counter(dev, crtc); - rc = drm_get_last_vbltimestamp(dev, crtc, &t_vblank, 0); - } while (cur_vblank != dev->driver->get_vblank_counter(dev, crtc)); - - /* Deal with counter wrap */ - diff = cur_vblank - dev->last_vblank[crtc]; - if (cur_vblank < dev->last_vblank[crtc]) { - diff += dev->max_vblank_count; - - DRM_DEBUG("last_vblank[%d]=0x%x, cur_vblank=0x%x => diff=0x%x\n", - crtc, dev->last_vblank[crtc], cur_vblank, diff); - } - - DRM_DEBUG("enabling vblank interrupts on crtc %d, missed %d\n", - crtc, diff); - - /* Reinitialize corresponding vblank timestamp if high-precision query - * available. Skip this step if query unsupported or failed. Will - * reinitialize delayed at next vblank interrupt in that case. - */ - if (rc) { - tslot = atomic_read(&dev->_vblank_count[crtc]) + diff; - vblanktimestamp(dev, crtc, tslot) = t_vblank; - } - - smp_mb__before_atomic_inc(); - atomic_add(diff, &dev->_vblank_count[crtc]); - smp_mb__after_atomic_inc(); -} - -/** - * drm_vblank_get - get a reference count on vblank events - * @dev: DRM device - * @crtc: which CRTC to own - * - * Acquire a reference count on vblank events to avoid having them disabled - * while in use. - * - * RETURNS - * Zero on success, nonzero on failure. - */ -int drm_vblank_get(struct drm_device *dev, int crtc) -{ - unsigned long irqflags, irqflags2; - int ret = 0; - - spin_lock_irqsave(&dev->vbl_lock, irqflags); - /* Going from 0->1 means we have to enable interrupts again */ - if (atomic_add_return(1, &dev->vblank_refcount[crtc]) == 1) { - spin_lock_irqsave(&dev->vblank_time_lock, irqflags2); - if (!dev->vblank_enabled[crtc]) { - /* 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 = dev->driver->enable_vblank(dev, crtc); - DRM_DEBUG("enabling vblank on crtc %d, ret: %d\n", - crtc, ret); - if (ret) - atomic_dec(&dev->vblank_refcount[crtc]); - else { - dev->vblank_enabled[crtc] = 1; - drm_update_vblank_count(dev, crtc); - } - } - spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags2); - } else { - if (!dev->vblank_enabled[crtc]) { - atomic_dec(&dev->vblank_refcount[crtc]); - ret = -EINVAL; - } - } - spin_unlock_irqrestore(&dev->vbl_lock, irqflags); - - return ret; -} -EXPORT_SYMBOL(drm_vblank_get); - -/** - * drm_vblank_put - give up ownership of vblank events - * @dev: DRM device - * @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_vblank_put(struct drm_device *dev, int crtc) -{ - BUG_ON(atomic_read(&dev->vblank_refcount[crtc]) == 0); - - /* Last user schedules interrupt disable */ - if (atomic_dec_and_test(&dev->vblank_refcount[crtc]) && - (drm_vblank_offdelay > 0)) - mod_timer(&dev->vblank_disable_timer, - jiffies + ((drm_vblank_offdelay * DRM_HZ)/1000)); -} -EXPORT_SYMBOL(drm_vblank_put); - -void drm_vblank_off(struct drm_device *dev, int crtc) -{ - struct drm_pending_vblank_event *e, *t; - struct timeval now; - unsigned long irqflags; - unsigned int seq; - - spin_lock_irqsave(&dev->vbl_lock, irqflags); - vblank_disable_and_save(dev, crtc); - DRM_WAKEUP(&dev->vbl_queue[crtc]); - - /* Send any queued vblank events, lest the natives grow disquiet */ - seq = drm_vblank_count_and_time(dev, crtc, &now); - list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { - if (e->pipe != crtc) - continue; - DRM_DEBUG("Sending premature vblank event on disable: \ - wanted %d, current %d\n", - e->event.sequence, seq); - - e->event.sequence = seq; - e->event.tv_sec = now.tv_sec; - e->event.tv_usec = now.tv_usec; - drm_vblank_put(dev, e->pipe); - list_move_tail(&e->base.link, &e->base.file_priv->event_list); - wake_up_interruptible(&e->base.file_priv->event_wait); - trace_drm_vblank_event_delivered(e->base.pid, e->pipe, - e->event.sequence); - } - - spin_unlock_irqrestore(&dev->vbl_lock, irqflags); -} -EXPORT_SYMBOL(drm_vblank_off); - -/** - * drm_vblank_pre_modeset - account for vblanks across mode sets - * @dev: DRM device - * @crtc: CRTC in question - * @post: post or pre mode set? - * - * Account for vblank events across mode setting events, which will likely - * reset the hardware frame counter. - */ -void drm_vblank_pre_modeset(struct drm_device *dev, int crtc) -{ - /* vblank is not initialized (IRQ not installed ?) */ - if (!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 (!dev->vblank_inmodeset[crtc]) { - dev->vblank_inmodeset[crtc] = 0x1; - if (drm_vblank_get(dev, crtc) == 0) - dev->vblank_inmodeset[crtc] |= 0x2; - } -} -EXPORT_SYMBOL(drm_vblank_pre_modeset); - -void drm_vblank_post_modeset(struct drm_device *dev, int crtc) -{ - unsigned long irqflags; - - if (dev->vblank_inmodeset[crtc]) { - spin_lock_irqsave(&dev->vbl_lock, irqflags); - dev->vblank_disable_allowed = 1; - spin_unlock_irqrestore(&dev->vbl_lock, irqflags); - - if (dev->vblank_inmodeset[crtc] & 0x2) - drm_vblank_put(dev, crtc); - - dev->vblank_inmodeset[crtc] = 0; - } -} -EXPORT_SYMBOL(drm_vblank_post_modeset); - -/** - * drm_modeset_ctl - handle vblank event counter changes across mode switch - * @DRM_IOCTL_ARGS: standard ioctl arguments - * - * Applications should call the %_DRM_PRE_MODESET and %_DRM_POST_MODESET - * ioctls around modesetting so that any lost vblank events are accounted for. - * - * Generally the counter will reset across mode sets. If interrupts are - * enabled around this call, we don't have to do anything since the counter - * will have already been incremented. - */ -int drm_modeset_ctl(struct drm_device *dev, void *data, - struct drm_file *file_priv) -{ - struct drm_modeset_ctl *modeset = data; - int ret = 0; - unsigned int crtc; - - /* If drm_vblank_init() hasn't been called yet, just no-op */ - if (!dev->num_crtcs) - goto out; - - crtc = modeset->crtc; - if (crtc >= dev->num_crtcs) { - ret = -EINVAL; - goto out; - } - - switch (modeset->cmd) { - case _DRM_PRE_MODESET: - drm_vblank_pre_modeset(dev, crtc); - break; - case _DRM_POST_MODESET: - drm_vblank_post_modeset(dev, crtc); - break; - default: - ret = -EINVAL; - break; - } - -out: - return ret; -} - -static int drm_queue_vblank_event(struct drm_device *dev, int pipe, - union drm_wait_vblank *vblwait, - struct drm_file *file_priv) -{ - 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->base.pid = current->pid; - e->event.base.type = DRM_EVENT_VBLANK; - e->event.base.length = sizeof e->event; - e->event.user_data = vblwait->request.signal; - e->base.event = &e->event.base; - e->base.file_priv = file_priv; - e->base.destroy = (void (*) (struct drm_pending_event *)) kfree; - - spin_lock_irqsave(&dev->event_lock, flags); - - if (file_priv->event_space < sizeof e->event) { - ret = -EBUSY; - goto err_unlock; - } - - file_priv->event_space -= sizeof e->event; - seq = drm_vblank_count_and_time(dev, pipe, &now); - - if ((vblwait->request.type & _DRM_VBLANK_NEXTONMISS) && - (seq - vblwait->request.sequence) <= (1 << 23)) { - vblwait->request.sequence = seq + 1; - vblwait->reply.sequence = vblwait->request.sequence; - } - - DRM_DEBUG("event on vblank count %d, current %d, crtc %d\n", - vblwait->request.sequence, seq, pipe); - - trace_drm_vblank_event_queued(current->pid, pipe, - vblwait->request.sequence); - - e->event.sequence = vblwait->request.sequence; - if ((seq - vblwait->request.sequence) <= (1 << 23)) { - e->event.sequence = seq; - e->event.tv_sec = now.tv_sec; - e->event.tv_usec = now.tv_usec; - drm_vblank_put(dev, pipe); - list_add_tail(&e->base.link, &e->base.file_priv->event_list); - wake_up_interruptible(&e->base.file_priv->event_wait); - vblwait->reply.sequence = seq; - trace_drm_vblank_event_delivered(current->pid, pipe, - vblwait->request.sequence); - } 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; -} - -/** - * 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) -{ - union drm_wait_vblank *vblwait = data; - int ret = 0; - unsigned int flags, seq, crtc, high_crtc; - - if ((!drm_dev_to_irq(dev)) || (!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_crtc = (vblwait->request.type & _DRM_VBLANK_HIGH_CRTC_MASK); - if (high_crtc) - crtc = high_crtc >> _DRM_VBLANK_HIGH_CRTC_SHIFT; - else - crtc = flags & _DRM_VBLANK_SECONDARY ? 1 : 0; - if (crtc >= dev->num_crtcs) - return -EINVAL; - - ret = drm_vblank_get(dev, crtc); - if (ret) { - DRM_DEBUG("failed to acquire vblank counter, %d\n", ret); - return ret; - } - seq = drm_vblank_count(dev, crtc); - - 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_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, crtc, vblwait, file_priv); - } - - if ((flags & _DRM_VBLANK_NEXTONMISS) && - (seq - vblwait->request.sequence) <= (1<<23)) { - vblwait->request.sequence = seq + 1; - } - - DRM_DEBUG("waiting on vblank count %d, crtc %d\n", - vblwait->request.sequence, crtc); - dev->last_vblank_wait[crtc] = vblwait->request.sequence; - DRM_WAIT_ON(ret, dev->vbl_queue[crtc], 3 * DRM_HZ, - (((drm_vblank_count(dev, crtc) - - vblwait->request.sequence) <= (1 << 23)) || - !dev->irq_enabled)); - - if (ret != -EINTR) { - struct timeval now; - - vblwait->reply.sequence = drm_vblank_count_and_time(dev, crtc, &now); - vblwait->reply.tval_sec = now.tv_sec; - vblwait->reply.tval_usec = now.tv_usec; - - DRM_DEBUG("returning %d to client\n", - vblwait->reply.sequence); - } else { - DRM_DEBUG("vblank wait interrupted by signal\n"); - } - -done: - drm_vblank_put(dev, crtc); - return ret; -} - -void drm_handle_vblank_events(struct drm_device *dev, int crtc) -{ - struct drm_pending_vblank_event *e, *t; - struct timeval now; - unsigned long flags; - unsigned int seq; - - seq = drm_vblank_count_and_time(dev, crtc, &now); - - spin_lock_irqsave(&dev->event_lock, flags); - - list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { - if (e->pipe != crtc) - continue; - if ((seq - e->event.sequence) > (1<<23)) - continue; - - DRM_DEBUG("vblank event on %d, current %d\n", - e->event.sequence, seq); - - e->event.sequence = seq; - e->event.tv_sec = now.tv_sec; - e->event.tv_usec = now.tv_usec; - drm_vblank_put(dev, e->pipe); - list_move_tail(&e->base.link, &e->base.file_priv->event_list); - wake_up_interruptible(&e->base.file_priv->event_wait); - trace_drm_vblank_event_delivered(e->base.pid, e->pipe, - e->event.sequence); - } - - spin_unlock_irqrestore(&dev->event_lock, flags); - - trace_drm_vblank_event(crtc, seq); -} - -/** - * drm_handle_vblank - handle a vblank event - * @dev: DRM device - * @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. - */ -bool drm_handle_vblank(struct drm_device *dev, int crtc) -{ - u32 vblcount; - s64 diff_ns; - struct timeval tvblank; - unsigned long irqflags; - - if (!dev->num_crtcs) - return false; - - /* Need timestamp lock to prevent concurrent execution with - * vblank enable/disable, as this would cause inconsistent - * or corrupted timestamps and vblank counts. - */ - spin_lock_irqsave(&dev->vblank_time_lock, irqflags); - - /* Vblank irq handling disabled. Nothing to do. */ - if (!dev->vblank_enabled[crtc]) { - spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); - return false; - } - - /* Fetch corresponding timestamp for this vblank interval from - * driver and store it in proper slot of timestamp ringbuffer. - */ - - /* Get current timestamp and count. */ - vblcount = atomic_read(&dev->_vblank_count[crtc]); - drm_get_last_vbltimestamp(dev, crtc, &tvblank, DRM_CALLED_FROM_VBLIRQ); - - /* Compute time difference to timestamp of last vblank */ - diff_ns = timeval_to_ns(&tvblank) - - timeval_to_ns(&vblanktimestamp(dev, crtc, vblcount)); - - /* Update vblank timestamp and count if at least - * DRM_REDUNDANT_VBLIRQ_THRESH_NS nanoseconds - * difference between last stored timestamp and current - * timestamp. A smaller difference means basically - * identical timestamps. Happens if this vblank has - * been already processed and this is a redundant call, - * e.g., due to spurious vblank interrupts. We need to - * ignore those for accounting. - */ - if (abs64(diff_ns) > DRM_REDUNDANT_VBLIRQ_THRESH_NS) { - /* Store new timestamp in ringbuffer. */ - vblanktimestamp(dev, crtc, vblcount + 1) = tvblank; - - /* Increment cooked vblank count. This also atomically commits - * the timestamp computed above. - */ - smp_mb__before_atomic_inc(); - atomic_inc(&dev->_vblank_count[crtc]); - smp_mb__after_atomic_inc(); - } else { - DRM_DEBUG("crtc %d: Redundant vblirq ignored. diff_ns = %d\n", - crtc, (int) diff_ns); - } - - DRM_WAKEUP(&dev->vbl_queue[crtc]); - drm_handle_vblank_events(dev, crtc); - - spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); - return true; -} -EXPORT_SYMBOL(drm_handle_vblank); |